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Sample records for factors impacting performance

  1. Modeling impact of environmental factors on photovoltaic array performance

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Jie; Sun, Yize; Xu, Yang [College of Mechanical Engineering, Donghua University NO.2999, North Renmin Road, Shanghai (China)

    2013-07-01

    It is represented in this paper that a methodology to model and quantify the impact of the three environmental factors, the ambient temperature, the incident irradiance and the wind speed, upon the performance of photovoltaic array operating under outdoor conditions. First, A simple correlation correlating operating temperature with the three environmental variables is validated for a range of wind speed studied, 2-8, and for irradiance values between 200 and 1000. Root mean square error (RMSE) between modeled operating temperature and measured values is 1.19% and the mean bias error (MBE) is -0.09%. The environmental factors studied influence I-V curves, P-V curves, and maximum-power outputs of photovoltaic array. The cell-to-module-to-array mathematical model for photovoltaic panels is established in this paper and the method defined as segmented iteration is adopted to solve the I-V curve expression to relate model I-V curves. The model I-V curves and P-V curves are concluded to coincide well with measured data points. The RMSE between numerically calculated maximum-power outputs and experimentally measured ones is 0.2307%, while the MBE is 0.0183%. In addition, a multivariable non-linear regression equation is proposed to eliminate the difference between numerically calculated values and measured ones of maximum power outputs over the range of high ambient temperature and irradiance at noon and in the early afternoon. In conclusion, the proposed method is reasonably simple and accurate.

  2. Citation graph, weighted impact factors and performance indices

    OpenAIRE

    Zyczkowski, Karol

    2009-01-01

    A scheme of evaluating an impact of a given scientific paper based on importance of papers quoting it is investigated. Introducing a weight of a given citation, dependent on the previous scientific achievements of the author of the citing paper, we define the weighting factor of a given scientist. Technically the weighting factors are defined by the components of the normalized leading eigenvector of the matrix describing the citation graph. The weighting factor of a given scientist, reflecti...

  3. Modeling impact of environmental factors on photovoltaic array performance

    Directory of Open Access Journals (Sweden)

    Jie Yang, Yize Sun, Yang Xu

    2013-01-01

    Full Text Available It is represented in this paper that a methodology to model and quantify the impact of the three environmental factors, the ambient temperature, the incident irradiance and the wind speed, upon the performance of photovoltaic array operating under outdoor conditions. First, A simple correlation correlating operating temperature with the three environmental variables is validated for a range of wind speed studied, 2-8 m/s, and for irradiance values between 200 and 1000 W/m2. Root mean square error (RMSE between modeled operating temperature and measured values is 1.19% and the mean bias error (MBE is -0.09%. The environmental factors studied influence I-V curves, P-V curves, and maximum-power outputs of photovoltaic array. The cell-to-module-to-array mathematical model for photovoltaic panels is established in this paper and the method defined as segmented iteration is adopted to solve the I-V curve expression to relate model I-V curves. The model I-V curves and P-V curves are concluded to coincide well with measured data points. The RMSE between numerically calculated maximum-power outputs and experimentally measured ones is 0.2307%, while the MBE is 0.0183%. In addition, a multivariable non-linear regression equation is proposed to eliminate the difference between numerically calculated values and measured ones of maximum power outputs over the range of high ambient temperature and irradiance at noon and in the early afternoon. In conclusion, the proposed method is reasonably simple and accurate.

  4. Prioritization of factors impacting on performance of power looms using AHP

    Science.gov (United States)

    Dulange, S. R.; Pundir, A. K.; Ganapathy, L.

    2014-08-01

    The purpose of this paper is to identify the critical success factors influencing the performance of power loom textiles, to evaluate their impact on the organizational performance and to find out the effect of these factors on the organizational performance of small and medium-sized enterprises (SMEs) in the Solapur (Maharashtra) industrial sector using AHP. In the methodology adopted, factors are identified through the literature survey and finalization of these factors is done by taking the opinion of experts in the Indian context. By cognitive map, the relation between these factors (direct and indirect effect) is determined and cause and effect diagram is prepared. Then these factors are arranged hierarchically and tree diagram is prepared. A questionnaire was designed and distributed among the experts; data is collected. Using expert choice software data is filled to quantify by pair-wise comparison of these factors and are prioritized. The weights demonstrate several key findings: local and global priority reveals that there is a substantial effect of the human resource, product style, and volume on the organizational performance. The skills and technology upgradation impact on organizational performance. Maintenance plays an important role in improving the organizational performances of the SMEs. Overall, the results showed the central role of the operational factors are important. The research is subject to the normal limitations of AHP. The study is using perceptual data provided by Experts which may not provide clear measures of impact factors. However, this can be overcome using more experts to collect data in future studies. Interestingly, the findings here may be generalisable outside Solapur like Ichalkarnji, Malegaon, and Bhiwadi (Maharashtra). Solapur power loom SMEs should consider AHP as an innovative tool for quantification of factors impacting on performance and improving operational and organizational performance in today's dynamic

  5. The Impacts of Total System Design Factors on Human Performance in Power Plants

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    A. Azadeh

    2005-01-01

    Full Text Available The objective of this study is to evaluate the impact of total system design factors (TSD on human performance in a power plant. The TSD factors are defined as design factors, which have an impact on the overall performance of the power plants in the context of total human engineering or macroergonomy. The systems being studied are the control rooms and maintenance departments of a 2000 MW thermal power plant? To achieve the above objective the TSD factors were addressed and assessed through a detailed questionnaire. The relationships between TSD factors and human performance were then examined through non-parametric correlation analysis (Kramer’s Phi and Kruskal-Wallis test of means. The selected TSD factors are related to procedures, work assessment, teamwork, self-organization, information exchange and communication. The results of this study show that the TSD factors such as organizational and safety procedures, teamwork, self-organization, job design and information exchange influence human performance in the power plant. The findings also suggest that the selected TSD factors correlate to human performance and must be considered, designed and tested concurrently with the engineering factors at the design phase of the system development cycle. Consequently, total system’s faults and organizational errors are reduced to an acceptable level and human performance is significantly increased. This is a challenging task for designers of power plants but is required if we are facing unforeseen and complex issues of such systems in twenty-first century. The methodology discussed here may be easily extended to all types of power plants.

  6. The impact of visual layout factors on performance in Web pages: a cross-language study.

    Science.gov (United States)

    Parush, Avi; Shwarts, Yonit; Shtub, Avy; Chandra, M Jeya

    2005-01-01

    Visual layout has a strong impact on performance and is a critical factor in the design of graphical user interfaces (GUIs) and Web pages. Many design guidelines employed in Web page design were inherited from human performance literature and GUI design studies and practices. However, few studies have investigated the more specific patterns of performance with Web pages that may reflect some differences between Web page and GUI design. We investigated interactions among four visual layout factors in Web page design (quantity of links, alignment, grouping indications, and density) in two experiments: one with pages in Hebrew, entailing right-to-left reading, and the other with English pages, entailing left-to-right reading. Some performance patterns (measured by search times and eye movements) were similar between languages. Performance was particularly poor in pages with many links and variable densities, but it improved with the presence of uniform density. Alignment was not shown to be a performance-enhancing factor. The findings are discussed in terms of the similarities and differences in the impact of layout factors between GUIs and Web pages. Actual or potential applications of this research include specific guidelines for Web page design.

  7. Impact beyond the impact factor.

    Science.gov (United States)

    Zupanc, Günther K H

    2014-02-01

    The journal impact factor is an annually calculated number for each scientific journal, based on the average number of times its articles published in the two preceding years have been cited. It was originally devised as a tool for librarians and publishers to provide information about the citation performance of a journal as a whole, but over the last few decades it has increasingly been used to assess the quality of specific articles and the research performance of individual investigators, institutions, and countries. In addition to this clear abuse of the journal impact factor, several conceptual and technical issues limit its usability as a measure of journal reputation, especially when journals are compared across different fields. An author's decision regarding the suitability of a scholarly journal for publication should, therefore, be based on the impact that this journal makes in the field of research, rather than on the journal impact factor.

  8. Impact of extrinsic factors on fine motor performance of children attending day care

    Science.gov (United States)

    Corsi, Carolina; dos Santos, Mariana Martins; de Andrade Perez Marques, Luísa; Rocha, Nelci Adriana Cicuto Ferreira

    2016-01-01

    Abstract Objective: To assess the impact of extrinsic factors on fine motor performance of children aged 2-years old. Methods: 73 children attending public and 21 private day care centers were assessed. Day care environment was evaluated using the Infant/Toddler Environment Rating Scale-Revised Edition (ITERS-R), fine motor performance was assessed through the Bayley Scales of Infant and Toddler Development-III (BSITD-III), socioeconomic data, maternal education and time of start at the day care were collected through interviews. Spearman's correlation coefficient was calculated to assess the association between the studied variables. Results: The time at the day care was positively correlated with the children's performance in some fine motor tasks of the BSITD-III, showing that the activities developed in day care centers were important for the refinement of specific motor skills, while the overall fine motor performance by the scale was associated with maternal education and the ITERS-R scale sub-item “language and understanding”. Conclusions: Extrinsic factors such as higher maternal education and quality of day care centers are associated with fine motor performance in children attending day care. PMID:27094472

  9. Which Environmental Factors Have the Highest Impact on the Performance of People Experiencing Difficulties in Capacity?

    Science.gov (United States)

    Loidl, Verena; Oberhauser, Cornelia; Ballert, Carolina; Coenen, Michaela; Cieza, Alarcos; Sabariego, Carla

    2016-04-12

    Disability is understood by the World Health Organization (WHO) as the outcome of the interaction between a health condition and personal and environmental factors. Comprehensive data about environmental factors is therefore essential to understand and influence disability. We aimed to identify which environmental factors have the highest impact on the performance of people with mild, moderate and severe difficulties in capacity, who are at risk of experiencing disability to different extents, using data from a pilot study of the WHO Model Disability Survey in Cambodia and random forest regression. Hindering or facilitating aspects of places to socialize in community activities, transportation and natural environment as well as use and need of personal assistance and use of medication on a regular basis were the most important environmental factors across groups. Hindering or facilitating aspects of the general environment were the most relevant in persons experiencing mild levels of difficulties in capacity, while social support, attitudes of others and use of medication on a regular basis were highly relevant for the performance of persons experiencing moderate to higher levels of difficulties in capacity. Additionally, we corroborate the high importance of the use and need of assistive devices for people with severe difficulties in capacity.

  10. Which Environmental Factors Have the Highest Impact on the Performance of People Experiencing Difficulties in Capacity?

    Directory of Open Access Journals (Sweden)

    Verena Loidl

    2016-04-01

    Full Text Available Disability is understood by the World Health Organization (WHO as the outcome of the interaction between a health condition and personal and environmental factors. Comprehensive data about environmental factors is therefore essential to understand and influence disability. We aimed to identify which environmental factors have the highest impact on the performance of people with mild, moderate and severe difficulties in capacity, who are at risk of experiencing disability to different extents, using data from a pilot study of the WHO Model Disability Survey in Cambodia and random forest regression. Hindering or facilitating aspects of places to socialize in community activities, transportation and natural environment as well as use and need of personal assistance and use of medication on a regular basis were the most important environmental factors across groups. Hindering or facilitating aspects of the general environment were the most relevant in persons experiencing mild levels of difficulties in capacity, while social support, attitudes of others and use of medication on a regular basis were highly relevant for the performance of persons experiencing moderate to higher levels of difficulties in capacity. Additionally, we corroborate the high importance of the use and need of assistive devices for people with severe difficulties in capacity.

  11. The impact of selected contextual factors on experts' clinical reasoning performance (does context impact clinical reasoning performance in experts?).

    NARCIS (Netherlands)

    Durning, S.J.; Artino, A.R.; Boulet, J.R.; Dorrance, K.; Vleuten, C.P.M. van der; Schuwirth, L.

    2012-01-01

    Context specificity, or the variation in a participant's performance from one case, or situation, to the next, is a recognized problem in medical education. However, studies have not explored the potential reasons for context specificity in experts using the lens of situated cognition and cognitive

  12. The Impact of Selected Contextual Factors on Experts' Clinical Reasoning Performance (Does Context Impact Clinical Reasoning Performance in Experts?)

    Science.gov (United States)

    Durning, Steven J.; Artino, Anthony R.; Boulet, John R.; Dorrance, Kevin; van der Vleuten, Cees; Schuwirth, Lambert

    2012-01-01

    Context specificity, or the variation in a participant's performance from one case, or situation, to the next, is a recognized problem in medical education. However, studies have not explored the potential reasons for context specificity in experts using the lens of situated cognition and cognitive load theories (CLT). Using these theories, we…

  13. The impact of supply chain-related factors on the environmental performance of manufacturing firms in Turkey

    NARCIS (Netherlands)

    Akin, M.; Bloemhof, J.M.; Wynstra, F.; Raaij, van E.M.

    2009-01-01

    This paper investigates the impact of supply chain-related factors on the adoption of proactive environmental strategies, and the impact of such strategies on environmental investments and environmental performance. Data were collected from 96 Turkish manufacturers using an online questionnaire. The

  14. The impact of supply chain-related factors on the environmental performance of manufacturing firms in Turkey

    NARCIS (Netherlands)

    Akin, M.; Bloemhof, J.M.; Wynstra, F.; Raaij, van E.M.

    2009-01-01

    This paper investigates the impact of supply chain-related factors on the adoption of proactive environmental strategies, and the impact of such strategies on environmental investments and environmental performance. Data were collected from 96 Turkish manufacturers using an online questionnaire. The

  15. THE IMPACT OF MANAGEMENT CONTROL ON THE HUMAN FACTOR AND CONSEQUENTLY ON ENTERPRISE PERFORMANCE

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    NICOLETA CRISTINA MATEI

    2012-05-01

    Full Text Available The current economic environment where enterprises run their activities is characterized by diversified, competitional supply, superior to the demand; a supply that is heterogenous, unstable both quantitatively and qualitatively; comprising numerous technical as well as technological mutations. Under these circumstances, enterprise managers must ensure the achievement of objectives and performance. In order to accomplish these, human, financial, material resources are to be used. The limits imposed by the usage of financial and material resources can be compensated for by means of the creativity and innovation pertaining to employees, therefore, the success of an enterprise becomes closely related to the capitalization of staff intelligence and skills, while the human resource becomes important for the management control by means of which an enterprise makes sure that its activities run according to plan and that objectives are met. The paper presents the impact of management control on the human factor and further to the enterprise performance, strategies of employee motivation, aspects regarding the use of plans as objectives, as well as aspects concerning the use of control techniques regarding the assessment of results.

  16. THE IMPACT OF MANAGEMENT CONTROL ON THE HUMAN FACTOR AND CONSEQUENTLY ON ENTERPRISE PERFORMANCE

    Directory of Open Access Journals (Sweden)

    Nicoleta Cristina MATEI

    2012-06-01

    Full Text Available The current economic environment where enterprises run their activities is characterized by diversified, competitional supply, superior to the demand; a supply that is heterogenous, unstable both quantitatively and qualitatively; comprising numerous technical as well as technological mutations. Under these circumstances, enterprise managers must ensure the achievement of objectives and performance. In order to accomplish these, human, financial, material resources are to be used. The limits imposed by the usage of financial and material resources can be compensated for by means of the creativity and innovation pertaining to employees, therefore, the success of an enterprise becomes closely related to the capitalization of staff intelligence and skills, while the human resource becomes important for the management control by means of which an enterprise makes sure that its activities run according to plan and that objectives are met. The paper presents the impact of management control on the human factor and further to the enterprise performance, strategies of employee motivation, aspects regarding the use of plans as objectives, as well as aspects concerning the use of control techniques regarding the assessment of results.

  17. A 10-year performance trajectory of top nutrition journals′ impact factors

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    Narges Jani

    2012-01-01

    Full Text Available Background and Aim: This study was performed to evaluate the impact factors (IFs and total citations of ISI-indexed nutrition journals in a 10-year period from 1999 to 2008 in order to assess the quality of nutrition journals. Materials and Methods: For this retrospective study, the IF and total citation data from 1998 to 2008 were collected through Journal Citation Reports of Thomson Scientific Corporation Web of Knowledge. We selected five highly cited journals in the "nutrition and dietetics" category for our analysis. These journals include Annual Reviews in Nutrition (ANNU REV NUTR, American Journal of Clinical Nutrition (AJCN, Progress in Lipid Research (PROG LIPID RES, Journal of Nutrition (J NUTR, and International Journal of Obesity (INT J OBESITY Results: All five selected journals were ranked as one of the top ten "nutrition and dietetics" journals between 1999 and 2008 in ISI database. Most of selected journals′ IF had an upward trend during the 10-year period with fluctuation in some cases. AJCN consistently received the greatest number of total citations during the study period, although its IF was not the highest among the five journals studied. Conclusion: The IF illustrated changes in relative rankings of five highly cited journals included in the "nutrition and dietetics" category of the Web of Knowledge. Rank according to the absolute number of citations received, however, did not correlate with rank according to IF.

  18. An Analysis of Impact Factors for Positioning Performance in WLAN Fingerprinting Systems Using Ishikawa Diagrams and a Simulation Platform

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    Keqiang Liu

    2017-01-01

    Full Text Available Many factors influence the positioning performance in WLAN RSSI fingerprinting systems, and summary of these factors is an important but challenging job. Moreover, impact analysis on nonalgorithm factors is significant to system application and quality control but little research has been conducted. This paper analyzes and summarizes the potential impact factors by using an Ishikawa diagram considering radio signal transmitting, propagating, receiving, and processing. A simulation platform was developed to facilitate the analysis experiment, and the paper classifies the potential factors into controllable, uncontrollable, nuisance, and held-constant factors considering simulation feasibility. It takes five nonalgorithm controllable factors including APs density, APs distribution, radio signal propagating attenuation factor, radio signal propagating noise, and RPs density into consideration and adopted the OFAT analysis method in experiment. The positioning result was achieved by using the deterministic and probabilistic algorithms, and the error was presented by RMSE and CDF. The results indicate that the high APs density, signal propagating attenuation factor, and RPs density, with the low signal propagating noise level, are favorable to better performance, while APs distribution has no particular impact pattern on the positioning error. Overall, this paper has made great potential contribution to the quality control of WLAN fingerprinting solutions.

  19. HOW TO SUSTAIN ECONOMIC PERFORMANCE? ECONOMIC GROWTH AND ITS IMPACT FACTORS

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    OANA SIMONA HUDEA (CARAMAN

    2012-05-01

    Full Text Available This paper intends to render several important factors of impact on economic growth and to describe the particular types of relationships of the latter with each one of its influencing elements. In order to correctly determine such issue, we have resorted to three carefully selected models that have been estimated and compared so as to identify the most adequate and representative regression. For this purpose we have performed an analysis based on cross-section annual data for 105 countries spread all over the world. After having tested and rejected certain exogenous variables initially considered, such as imports or exports, we have finally retained the external debt and foreign direct investments as explanatory items of the dependent variable. The results revealed that both of them positively affect the gross domestic product of the analysed countries, this one being inelastic in relation to the exogenous variables considered. Even if the relationship between the economic growth and the external debt of a country is usually negative, as the money exit out of the country due to the debt service causes non-achieved potential investments, yet, there is an inflexion point up to which the external debt has a positive influence on economic growth by the increase of the investments funds acquired as result of the external credit contracting, this being the case reflected by our study. As for the relationship existing between foreign direct investments and GDP, the economic theory confirms that FDI and economic growth are directly correlated, the former contributing to technical progress, production increase and, finally, to the improvement of the living standard.

  20. An Investigation of the Factors Affecting Performance of Environmental Impact Assessment Practices (EIA in Pakistan

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    Shahbaz Hussain

    2015-01-01

    Full Text Available Environmental Impact Assessment is used to detect changes that a proposed project may have on environment. The intent of present study is to investigate impact of institutional capacity and legal framework on performance of Environmental Impact Assessment practices in Pakistan such as screening, scoping and mitigation, environmental management plan and reporting. Sample of 200 EIA professionals have been selected by using random sampling approach from all provinces of Pakistan. Data has been collected through structured questionnaire and analysed by using AMOS 19 (Analysis of Moment Structures software. Results of path analysis indicated that institutional capacity and legal framework have significant direct impact on performance of all EIA practices in Pakistan. Model fit statistics such as GFI, RMR, NFI, IFI, TLI, RFI, CFI indicate the fitness of research model in this context. It has been suggested that there must be relevant and sufficient human resources that can uplift institutional capacity and legal framework must be well implemented because it will lead to enhanced performance of EIA practices in Pakistan.

  1. Factors Impacting Job Performance and Role Attractiveness in Academic Directors and Their Implications for Policy and Practice in Higher Education

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    Vilkinas, Tricia; Ladyshewsky, Richard K.

    2014-01-01

    The purpose of this study was to identify factors that impacted on the performance and attractiveness of the Academic Director's role. Academic Directors are responsible for leading and managing an academic qualification. Academic Directors (n = 101) participating in a leadership development programme were invited to respond to an online 360…

  2. The Impact Of Contingent Factors On Performance Measures In The Rural Banks Of Ashanti Region Of Ghana

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    Ben K. Agyei-Mensah

    2012-08-01

    Full Text Available The study examined the application of performance measurement techniques in the rural banks in the Ashanti Region of Ghana. Management accounting theory suggests that two different measures of branch performance should be computed; one to evaluate the economic performance of each branch and the other to evaluate the performance of branch managers (managerial performance. The purpose of the study was to ascertain the type of performance measures that are applied in these institutions. That is whether or not the management of these banks has been applying financial and/or non financial performance measures in assessing the performance of their branches and the managers of those branches In addition the study examined the impact of contingent factors on the use of financial and non financial performance measures. Though, all the respondents stated that they used both financial and non financial performance measures, there was heavy reliance on financial measures. The study found that neither the balanced scorecard nor the Tableau de Bord have ever been used as performance measures. The study findings also revealed that profitability (i.e. Operating profit margin, Return on shareholders' capital and liquidity (i.e. current ratio and working capital ratio have varied impact on the use of performance measures by the rural banks in the Ashanti Region of Ghana.

  3. The Impact of Home Environment Factors on Academic Performance of Senior Secondary School Students in Garki Area District, Abuja - Nigeria

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    L. T. Dzever

    2015-12-01

    Full Text Available The study examined the impact of home environment factors on the academic performance of public secondary school students in Garki Area District, Abuja, Nigeria. The stratified sampling technique was used to select 300 students from six public schools, while the simple random sampling technique was used to administer the questionnaire. The study utilized a descriptive survey research design for the study. Also, data on student’s academic performance was obtained from student’s scores in four selected school subjects. Data obtained was analyzed using descriptive and inferential statistical techniques; Pearson Product Moment Correlation and Multiple regression analysis (ANOVA. The results result revealed a positive and significant relationship between permissive patenting style with academic performance (p0.05. Also, the result from the study identified income, educational background and occupational level as well as permissive parenting style as the main predictive variables influencing students’ academic performance.

  4. Factors that impact the financial performance of broiler production in southern states of Paraná, Brazil

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    AS Mendes

    2014-03-01

    Full Text Available This study aimed at identifying the factors that affect the financial performance of broiler chicken production in Southwest of Paraná state in Brazil, as well as to study the relationship of these factors with the social-economic situation of poultry farmers. Data were obtained from a questionnaire applied to broiler chicken farmers between February and March, 2011. The questionnaire included 39 questions relative to farmer's age, family size, land possession, capital invested in broiler farming, gross income per flock, training and broiler farming experience, production size, credit needs, technical service, labor, production problems, and bird weight at slaughter. Data were submitted to descriptive statistical analysis. The relationship between production data and financial performance was determined using Pearson correlation coefficient, at 95% confidence level. Approximately 64.84% of the interviewed broiler farmers in Paraná state presented medium to low financial performance. Factors such as education level, facility size, labor, gross income per flock, and average bird weight at slaughter had a positive impact on financial performance. The production problems that most affected the broiler production were environmental challenges, poor feed conversion, as well as management problems and low-quality chicks.

  5. Critical success factors for implementation of supply chain management in Indian small and medium enterprises and their impact on performance

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    Ravinder Kumar

    2015-06-01

    Full Text Available Globalization of the economy, e-business, and introduction of new technologies pose new challenges to all organizations especially for small and medium enterprises (SMEs. In this scenario, successful implementation of supply chain management (SCM can give SMEs an edge over their competitors. However, SMEs in India and other developing countries face problems in SCM implementation due to lack of resources and direction. Against this backdrop, this paper identified 13 critical success factors (CSFs for implementation of SCM in SMEs and studied their impact on performance of Indian SMEs. Top management commitment, long–term vision, focus on core strengths, devoted resources for supply chain, and development of effective SCM strategy emerged as the most pertinent CSFs. To measure improvement in performance, the authors considered different measures related to customer service and satisfaction, innovation and growth, financial performance, and internal business. Results are analysed by testing research propositions using standard statistical tools.

  6. Risk factors and impact of retained fetal membranes on performance of dairy bovines reared under subtropical conditions.

    Science.gov (United States)

    Kumari, Susavi; Prasad, Shiv; Kumaresan, Arumugam; Manimaran, Ayyasamy; Patbandha, Tapas Kumar; Pathak, Rupal; Boro, Prasanta; Mohanty, Tushar Kumar; Ravi, Sanjay Kumar

    2015-02-01

    The risk factors and impact of retained fetal membranes (RFM) on productive and reproductive performance of crossbred cattle, Zebu cattle, and Murrah buffalos were evaluated using data spread over 12 years. Multivariable logistic regression model was used to identify risk factors and to quantify their odds ratio (OR). Overall incidence of RFM in crossbred cattle, Zebu cattle, and Murrah buffalos were 26, 16, and 13 %, respectively; and significant risk factors for RFM in crossbred cattle were abortion (OR = 3.9), dead calf (OR = 4.1), dystocia (OR = 4.3), pluriparity (OR = 1.5), and shorter gestation length (OR = 4.3). In Zebu cattle, abortion (OR = 4.0), dead calf (OR = 3.7), dystocia (OR = 3.9), lower birth weight of calf (OR = 1.6), and shorter gestation length (OR = 6.4) were significant risk factors for RFM. In Murrah buffalos, abortion (OR = 19.2), dead calf (OR = 4.4), dystocia (OR = 4.7), pluriparity (OR = 1.7), shorter gestation length (OR = 12.7), and calving during summer season (OR = 1.8) were the risk factors for RFM. Although the occurrence of RFM did not affect fertility parameters, a significant (P gestation length were the main risk factors for RFM in dairy bovine.

  7. Assimilation Time as a Factor of Performance: Impact on a New Generation of Students

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    Mohrweis, Lawrence C.; Pitt, Kay C.

    2010-01-01

    This paper explores the issue of whether assimilation time has any bearing on the performance of students. Assimilation time is defined as the number of times during the week that a class meets. This study examined whether students would perform better in a 50-minute class that met three days a week versus a 75-minute class that met just two days…

  8. Intraoperative floppy iris syndrome in Indian population: A prospective study on incidence, risk factors, and impact on operative performance

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    Shilpa Goyal

    2014-01-01

    Full Text Available Purpose: The purpose of this study was to evaluate the incidence, risk factors, and impact of intraoperative floppy iris syndrome (IFIS on surgical performance. Materials and Methods : Consecutive cataract surgeries from October 2010 to Feb 2011 (1003 eyes, 980 patients; 568 males, 412 females were analyzed prospectively. Operating surgeon, masked about medication history, noted the intraoperative details. Cases were identified as IFIS or non-IFIS. Multivariate analysis was performed to find risk factors for IFIS. Results : Prevalence of tamsulosin use among men undergoing cataract surgery was 7.0% (41 with incidence of IFIS 4.78% (48. On multivariate analysis, hypertension (OR: 3.2, 95% confidence interval, 95% CI: 1.39-6.57; P = 0.005, use of tamsulosin (OR: 133.32, 95% CI: 50.43-352.48; P < 0.0001, or alfuzosin (OR: 9.36, 95% CI: 2.34-37.50; P = 0.002 were the factors associated with IFIS. Among men taking tamsulosin (n = 41 and alfuzosin (n = 28, 68.3% and 16.6% developed IFIS, respectively. In subgroup analysis of men on tamsulosin, no factor added to the risk posed by tamsulosin. Seventeen of 944 eyes not exposed to any drug had IFIS (0.018%. On subgroup analysis, only risk factor for IFIS was hypertension (OR: 4.67, 95% CI: 1.63-13.35; P = 0.002. Of 48 IFIS eyes, the surgeon observed increased difficulty in 57.1% (21 and additional measures were required in 9 eyes. Mean operative time was increased in IFIS eyes (11.68 ± 3.46 vs. 10.01 ± 0.22 min; P = 0.001. Surgical outcome was good in all cases. Conclusion : The prevalence of tamsulosin intake and IFIS incidence is higher in India. Current tamsulosin/alfuzosin use and hypertension are important risk factors. IFIS makes the surgery more difficult, significantly prolongs the operative time, and predisposes for other intraoperative complications. However, with appropriate management, final operative outcome is not affected.

  9. What Are the Major Impact Factors on Research Performance of Young Doctorate Holders in Science in China: A USTC Survey

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    Gu, Jibao; Lin, Yu; Vogel, Doug; Tian, Wen

    2011-01-01

    Doctoral graduate research performance (DRP) is recognized as one of the most critical indices for evaluation of the success of doctoral education. Doctoral graduates with high research performance directly reflect a higher ability in academic research and academic achievement. Consequently, identifying which factors influence DRP is potentially…

  10. Milestones and Impact Factors

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    Grandjean Philippe

    2010-07-01

    Full Text Available Abstract Environmental Health has just received its first Impact Factor by Thomson ISI. At a level of 2.48, this achievement is quite satisfactory and places Environmental Health in the top 25% of environmental science journals. When the journal was launched in 2002, it was still unclear whether the Open Access publishing model could be made into a viable commercial enterprise within the biomedical field. During the past eight years, Open Access journals have become widely available, although still covering only about 15% of journal titles. Major funding agencies and institutions, including prominent US universities, now require that researchers publish in Open Access journals. Because of the profound role of scientific journals for the sharing of results and communication between researchers, the advent of Open Access may be of as much significance as the transition from handwriting to printing via moveable type. As Environmental Health is an electronic Open Access journal, the numbers of downloads at the journal website can be retrieved. The top-20 list of articles most frequently accessed shows that all of them have been downloaded over 10,000 times. Back in 2002, the first article published was accessed only 49 times during the following month. A year later, the server had over 1,000 downloads per month, and now the total number of monthly downloads approaches 50,000. These statistics complement the Impact Factor and confirm the viability of Open Access in our field of research. The advent of digital media and its decentralized mode of distribution - the internet - have dramatically changed the control and financing of scientific information dissemination, while facilitating peer review, accelerating editorial handling, and supporting much needed transparency. Both the meaning and means of "having an impact" are therefore changing, as will the degree and way in which scientific journals remain "factors" in that impact.

  11. Milestones and impact factors.

    Science.gov (United States)

    Ozonoff, David M; Grandjean, Philippe

    2010-07-08

    Environmental Health has just received its first Impact Factor by Thomson ISI. At a level of 2.48, this achievement is quite satisfactory and places Environmental Health in the top 25% of environmental science journals. When the journal was launched in 2002, it was still unclear whether the Open Access publishing model could be made into a viable commercial enterprise within the biomedical field. During the past eight years, Open Access journals have become widely available, although still covering only about 15% of journal titles. Major funding agencies and institutions, including prominent US universities, now require that researchers publish in Open Access journals. Because of the profound role of scientific journals for the sharing of results and communication between researchers, the advent of Open Access may be of as much significance as the transition from handwriting to printing via moveable type. As Environmental Health is an electronic Open Access journal, the numbers of downloads at the journal website can be retrieved. The top-20 list of articles most frequently accessed shows that all of them have been downloaded over 10,000 times. Back in 2002, the first article published was accessed only 49 times during the following month. A year later, the server had over 1,000 downloads per month, and now the total number of monthly downloads approaches 50,000. These statistics complement the Impact Factor and confirm the viability of Open Access in our field of research. The advent of digital media and its decentralized mode of distribution - the internet - have dramatically changed the control and financing of scientific information dissemination, while facilitating peer review, accelerating editorial handling, and supporting much needed transparency. Both the meaning and means of "having an impact" are therefore changing, as will the degree and way in which scientific journals remain "factors" in that impact.

  12. Contextual Factors Affecting E-Government Strategy Implementation and Its Impact on Public Sector Performance in Kenya

    Directory of Open Access Journals (Sweden)

    Dr. James Gathungu

    2013-06-01

    Full Text Available This paper assesses the contextual factors affecting the implementation of e-government strategy and its impact on the performance of the public sector in Kenya using the Wing Lam, (2005 E-government Integration Model. Electronic government (E-government is viewed in this study as the utilization of Information Communication Technologies (ICTs to transform the efficiency, effectiveness, transparency and accountability of exchanges within government, between government and citizens and businesses locally and abroad; and to empower citizens through access and use of information. Although e-government is a rapidly growing concept in both developing and developed countries very few e-government initiatives progress to maturity. Different countries are faced with different contextual circumstances and environments in the realization of e-government initiatives. This study attempts to address the gap between theory and rhetoric about the potential of e-government and the reality of its application on the ground in Kenya. The study attempts to analyze the philosophy, theories and paradigms of e-government. The development of the commercial concept as a new paradigm in public administration replacing the traditional bureaucratic systems of government is highlighted in the study. A detailed conceptual discussion anchors the study on the Wing Lam, (2005 E-government Integration Model (EGI basing it on the Kenyan perspective. The study also reviews relevant e-government studies from an international, regional and local perspective anchoring the study on the configuration school of management thought. These discussions are used to develop new insights in view of the emerging issues and their relevance to the public sector in Kenya.

  13. Contextual Factors Affecting E-Government Strategy Implementation and Its Impact on Public Sector Performance in Kenya

    Directory of Open Access Journals (Sweden)

    Dr. James Gathungu

    2013-06-01

    Full Text Available This paper assesses the contextual factors affecting the implementation of e-government strategy and its impact on the performance of the public sector in Kenya using the Wing Lam, (2005 E-government Integration Model. Electronic government (E-government is viewed in this study as the utilization of Information Communication Technologies (ICTs to transform the efficiency, effectiveness, transparency and accountability of exchanges within government, between government and citizens and businesses locally and abroad; and to empower citizens through access and use of information. Although e-government is a rapidly growing concept in both developing and developed countries very few e-government initiatives progress to maturity. Different countries are faced with different contextual circumstances and environments in the realization of e-government initiatives. This study attempts to address the gap between theory and rhetoric about the potential of e-government and the reality of its application on the ground in Kenya. The study attempts to analyze the philosophy, theories and paradigms of e-government. The development of the commercial concept as a new paradigm in public administration replacing the traditional bureaucratic systems of government is highlighted in the study. A detailed conceptual discussion anchors the study on the Wing Lam, (2005 E-government Integration Model (EGI basing it on the Kenyan perspective. The study also reviews relevant e-government studies from an international, regional and local perspective anchoring the study on the configuration school of management thought. These discussions are used to develop new insights in view of the emerging issues and their relevance to the public sector in Kenya.  

  14. How is impact factor impacting our research?

    Science.gov (United States)

    Rawat, Seema

    2014-01-01

    The impact factor (IF) of an journal is a measure reflecting the average number of citations to recent articles published in the journal. It is frequently used as a proxy for the relative importance of a journal within its field, with journals with higher impact factors deemed to be more important than those with lower ones. However it is not a perfect metric and has its own limitations. Journals are increasingly finding new ways to improve their impact factor by increasing self citation, publishing more review articles. This correspondence discuss the fallacies of the impact factor.

  15. Milestones and impact factors

    DEFF Research Database (Denmark)

    Ozonoff, David M; Grandjean, Philippe

    2010-01-01

    universities, now require that researchers publish in Open Access journals. Because of the profound role of scientific journals for the sharing of results and communication between researchers, the advent of Open Access may be of as much significance as the transition from handwriting to printing via moveable...... type. As Environmental Health is an electronic Open Access journal, the numbers of downloads at the journal website can be retrieved. The top-20 list of articles most frequently accessed shows that all of them have been downloaded over 10,000 times. Back in 2002, the first article published...... was accessed only 49 times during the following month. A year later, the server had over 1,000 downloads per month, and now the total number of monthly downloads approaches 50,000. These statistics complement the Impact Factor and confirm the viability of Open Access in our field of research. The advent...

  16. Impactitis: The impact factor myth syndrome

    Directory of Open Access Journals (Sweden)

    Elsaie Mohamed

    2009-01-01

    Full Text Available Background : In the early 1960s, Eugene Garfield and Irving Sher created the journal impact factor to help select journals for the Science Citation Index (SCI. Today it has become a widespread subject of controversy even for Garfield, the man who created it who is quoted saying " Impact Factor is not a perfect tool to measure the quality of articles but there is nothing better and it has the advantage of already being in existence and is, therefore, a good technique for scientific evaluation". The use of the term "impact factor" has gradually evolved, especially in Europe, to include both journal and author impact. This ambiguity often causes problems. It is one thing to use impact factors to compare journals and quite another to use them to compare authors. Journal impact factors generally involve relatively large populations of articles and citations. Individual authors, on average, produce much smaller numbers of articles. Objectives: Impact factor, an index based on the frequency with which a journal′s articles are cited in scientific publications, is a putative marker of journal quality. However, empiric studies on impact factor′s validity as an indicator of quality are lacking. The authors try to evaluate and highlight the validity of Impact Factors and its significance as a tool of assessment for scientific publications. Methods: Analysis of the several reports in literature and from their own point of view. Conclusion: A journal′s impact factor is based on 2 elements: the numerator, which is the number of citations in the current year to any items published in a journal in the previous 2 years, and the denominator, which is the number of substantive articles (source items published in the same 2 years. The impact factor could just as easily be based on the previous year′s articles alone, which would give an even greater weight to rapidly changing fields.

  17. Impact of helminth diagnostic test performance on estimation of risk factors and outcomes in HIV-positive adults.

    Directory of Open Access Journals (Sweden)

    Michael B Arndt

    Full Text Available BACKGROUND: Traditional methods using microscopy for the detection of helminth infections have limited sensitivity. Polymerase chain reaction (PCR assays enhance detection of helminths, particularly low burden infections. However, differences in test performance may modify the ability to detect associations between helminth infection, risk factors, and sequelae. We compared these associations using microscopy and PCR. METHODS: This cross-sectional study was nested within a randomized clinical trial conducted at 3 sites in Kenya. We performed microscopy and real-time multiplex PCR for the stool detection and quantification of Ascaris lumbricoides, Necator americanus, Ancylostoma duodenale, Strongyloides stercoralis, and Schistosoma species. We utilized regression to evaluate associations between potential risk factors or outcomes and infection as detected by either method. RESULTS: Of 153 HIV-positive adults surveyed, 55(36.0% and 20(13.1% were positive for one or more helminth species by PCR and microscopy, respectively (p<0.001. PCR-detected infections were associated with farming (Prevalence Ratio 1.57, 95% CI: 1.02, 2.40, communal water source (PR 3.80, 95% CI: 1.01, 14.27, and no primary education (PR 1.54, 95% CI: 1.14, 2.33, whereas microscopy-detected infections were not associated with any risk factors under investigation. Microscopy-detected infections were associated with significantly lower hematocrit and hemoglobin (means of -3.56% and -0.77 g/dl and a 48% higher risk of anemia (PR 1.48, 95% CI: 1.17, 1.88 compared to uninfected. Such associations were absent for PCR-detected infections unless infection intensity was considered, Infections diagnosed with either method were associated with increased risk of eosinophilia (PCR PR 2.42, 95% CI: 1.02, 5.76; microscopy PR 2.92, 95% CI: 1.29, 6.60. CONCLUSION: Newer diagnostic methods, including PCR, improve the detection of helminth infections. This heightened sensitivity may improve the

  18. Impact of Contextual Factors on the Effect of Interventions to Improve Health Worker Performance in Sub-Saharan Africa: Review of Randomised Clinical Trials.

    Directory of Open Access Journals (Sweden)

    Claire Blacklock

    Full Text Available Africa bears 24% of the global burden of disease but has only 3% of the world's health workers. Substantial variation in health worker performance adds to the negative impact of this significant shortfall. We therefore sought to identify interventions implemented in sub-Saharan African aiming to improve health worker performance and the contextual factors likely to influence local effectiveness.A systematic search for randomised controlled trials of interventions to improve health worker performance undertaken in sub-Saharan Africa identified 41 eligible trials. Data were extracted to define the interventions' components, calculate the absolute improvement in performance achieved, and document the likelihood of bias. Within-study variability in effect was extracted where reported. Statements about contextual factors likely to have modified effect were subjected to thematic analysis. Interventions to improve health worker performance can be very effective. Two of the three trials assessing mortality impact showed significant reductions in death rates (age<5 case fatality 5% versus 10%, p<0.01; maternal in-hospital mortality 6.8/1000 versus 10.3/1000; p<0.05. Eight of twelve trials focusing on prescribing had a statistically significant positive effect, achieving an absolute improvement varying from 9% to 48%. However, reported range of improvement between centres within trials varied substantially, in many cases exceeding the mean effect. Nine contextual themes were identified as modifiers of intervention effect across studies; most frequently cited were supply-line failures, inadequate supervision or management, and failure to follow-up training interventions with ongoing support, in addition to staff turnover.Interventions to improve performance of existing staff and service quality have the potential to improve patient care in underserved settings. But in order to implement interventions effectively, policy makers need to understand and

  19. Factors Impacting Knowledge Sharing

    DEFF Research Database (Denmark)

    Schulzmann, David; Slepniov, Dmitrij

    The purpose of this paper is to examine various factors affecting knowledge sharing at the R&D center of a Western MNE in China. The paper employs qualitative methodology and is based on the action research and case study research techniques. The findings of the paper advance our understanding...... about factors that affect knowledge sharing. The main emphasis is given to the discussion on how to improve knowledge sharing in global R&D organizations....

  20. Reliability of journal impact factor rankings

    Directory of Open Access Journals (Sweden)

    Greenwood Darren C

    2007-11-01

    Full Text Available Abstract Background Journal impact factors and their ranks are used widely by journals, researchers, and research assessment exercises. Methods Based on citations to journals in research and experimental medicine in 2005, Bayesian Markov chain Monte Carlo methods were used to estimate the uncertainty associated with these journal performance indicators. Results Intervals representing plausible ranges of values for journal impact factor ranks indicated that most journals cannot be ranked with great precision. Only the top and bottom few journals could place any confidence in their rank position. Intervals were wider and overlapping for most journals. Conclusion Decisions placed on journal impact factors are potentially misleading where the uncertainty associated with the measure is ignored. This article proposes that caution should be exercised in the interpretation of journal impact factors and their ranks, and specifically that a measure of uncertainty should be routinely presented alongside the point estimate.

  1. Factors Impacting Student Service Utilization at Ontario Colleges: Key Performance Indicators as a Measure of Success: A Niagara College View

    Science.gov (United States)

    Veres, David

    2015-01-01

    Student success in Ontario College is significantly influenced by the utilization of student services. At Niagara College there has been a significant investment in student services as a strategy to support student success. Utilizing existing KPI data, this quantitative research project is aimed at measuring factors that influence both the use of…

  2. Factors impacting biotransformation kinetics of trace organic compounds in lab-scale activated sludge systems performing nitrification and denitrification

    Energy Technology Data Exchange (ETDEWEB)

    Su, Lijuan; Aga, Diana [Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY 14260 (United States); Chandran, Kartik [Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027 (United States); Khunjar, Wendell O., E-mail: wkhunjar@hazenandsawyer.com [Hazen and Sawyer P.C., Fairfax, VA 22030 (United States)

    2015-01-23

    Highlights: • We examined TOrC biotransformation kinetics in nitrifying and denitrifying reators. • TOrC biotransformation was linked to heterotrophic and autotrophic activity. • TOrC biotransformation rates were not sensitive to the initial TOrC concentration. • Readily biodegradable organic matter suppressed TOrC biotransformation rates. - Abstract: To predict TOrC fate in biological activated sludge systems, there is a need to accurately determine TOrC biodegradation kinetics in mixed microbial cultures. Short-term batch tests with salicylic acid, 17α-ethinylestradiol, nonylphenol, trimethoprim and carbamazepine were conducted with lab-scale activated sludge cultures in which the initial TOrC concentration (1 mg/L and 0.0005 mg/L) and readily biodegradable substrate concentrations were varied. The results indicate that pseudo-first order kinetic estimates of TOrC are not sensitive (p > 0.05) to the initial TOrC concentration as long as the initial TOrC concentration (S{sub 0}) to biomass (X{sub 0}) ratio (on COD basis) is below 2 × 10{sup −3}. The presence of readily biodegradable organic matter suppresses TOrC biotransformation rates under nitrifying and denitrifying conditions, and this impact can be adequately described using a reversible non-competitive inhibition equation. These results demonstrate the importance of closely mimicking parent reactor conditions in batch testing because biotransformation parameters are impacted by in-situ carbon loading and redox conditions.

  3. The impact of human factors, crashworthiness and optical performance design requirements on helmet-mounted display development from the 1970s to the present

    Science.gov (United States)

    Harding, Thomas H.; Rash, Clarence E.; McLean, William E.; Martin, John S.

    2015-05-01

    Driven by the operational needs of modern warfare, the helmet-mounted display (HMD) has matured from a revolutionary, but impractical, World War I era idea for an infantry marksman's helmet-mounted weapon delivery system to a sophisticated and ubiquitous display and targeting system that dominates current night warfighting operations. One of the most demanding applications for HMD designs has been in Army rotary-wing aviation, where HMDs offer greater direct access to visual information and increased situational awareness in an operational environment where information availability is critical on a second-to-second basis. However, over the past 40 years of extensive HMD development, a myriad of crashworthiness, optical, and human factors issues have both frustrated and challenged designers. While it may be difficult to attain a full consensus on which are the most important HMD design factors, certainly head-supported weight (HSW), exit pupil size, field-of-view, image resolution and physical eye relief have been among the most critical. A confounding factor has been the interrelationship between the many design issues, such as early attempts to use non-glass optical elements to lower HSW, but at the cost of image quality, and hence, pilot visual performance. This paper traces how the role of the demanding performance requirements placed on HMDs by the U.S. Army aviation community has impacted the progress of HMD designs towards the Holy Grail of HMD design: a wide field-of-view, high resolution, binocular, full-color, totally crashworthy system.

  4. Critical success factors for implementation of supply chain management in Indian small and medium enterprises and their impact on performance

    OpenAIRE

    Ravinder Kumar; Rajesh K. Singh; Ravi Shankar

    2015-01-01

    Globalization of the economy, e-business, and introduction of new technologies pose new challenges to all organizations especially for small and medium enterprises (SMEs). In this scenario, successful implementation of supply chain management (SCM) can give SMEs an edge over their competitors. However, SMEs in India and other developing countries face problems in SCM implementation due to lack of resources and direction. Against this backdrop, this paper identified 13 critical success factors...

  5. Impact of Psychological Empowerment on Nonfinancial Performance

    Directory of Open Access Journals (Sweden)

    Enis HEMEDOĞLU

    2012-12-01

    Full Text Available This study examines the effects of psychological empowerment on nonfinancial performance of organizations. The sample of the research consists of 70 employees of an enterprise serving in health sector. “Impact”, “competence” and “meaning” dimensions for psychological empowerment and “customer perspective”, “internal processes perspective” and “learning and growth perspective” dimensions for nonfinancial performance are derived from factor analysis. There is a significant negative relationship between internal processes perspective, one of nonfinancial performance dimensions, and impact dimension, one of psychological empowerment dimensions. Moreover, there are significant positive relationships between learning and growth perspective, one of nonfinancial performance dimensions, and psychological empowerment, impact dimension and meaning dimension of psychological empowerment. According to regression analysis, psychological empowerment does not have impact on nonfinancial performance.

  6. Internal Audit of Quality in 5s Environment: Perception on Critical Factors, Effectiveness and Impact on Organizational Performance

    OpenAIRE

    2015-01-01

    Quality Environment (5S) Practice is a concept which has been widely adopted by organizations as one way to achieve Total Quality Management (TQM) and business excellence. 5S refers to 5 principles to maintain quality which emanate from Japanese word Seiri (sorting), Seiton (straightening), Seiso (shining), Seiketsu (standardize) and Shitsuke (sustain). 5s concept aims to create a conducive, clean and tidy workplace which in turn can improve work quality and performance. Internal audit of 5S ...

  7. Radiologists' knowledge and perceptions of the impact of contrast-induced nephropathy and its risk factors when performing computed tomography examinations: A survey of European radiologists

    Energy Technology Data Exchange (ETDEWEB)

    Reddan, Donal [University College Galway Hospitals, Unit 7, Merlin Park Hospital, Galway (Ireland)], E-mail: donal.reddan@mailn.hse.ie; Fishman, Elliot K. [Johns Hopkins Hospital, Baltimore, MD (United States)

    2008-05-15

    Background: The past decade has seen a proliferation in the number of CT procedures. As increasing numbers of elderly patients with multiple comorbidities undergo contrast media (CM)-enhanced procedures, more patients are at risk for contrast-induced nephropathy (CIN). Objectives: To understand whether radiologists are sufficiently aware of the incidence, impact and risk factors of CIN, and whether they are taking sufficient measures to prevent CIN among patients undergoing CT. Materials and methods: A telephone or online survey was conducted in 2005 with 509 radiologists from 10 European countries. Participants had a minimum of 3 years' experience and performed at least 50 CT scans per week. Results: Most (88%) radiologists believed that CIN is an important issue. While 45% identify that a patient is experiencing CIN when the serum creatinine level increases >25% (0.5 mg/dL) from baseline within 48 h, the remainder used criteria that might lead to significant under-diagnosis. Most (72%) radiologists believed that CIN is associated with increased morbidity; 56% did not believe that it is associated with increased mortality. Most respondents agreed that pre-existing renal impairment (97%), dehydration (90%) and diabetes (89%) were risk factors for CIN; however, 26%, 30% and 46%, respectively, did not identify advanced age, CM dose or congestive cardiac failure as risk factors. Only 7% of radiologists thought they were always made aware of CIN associated with their cases and 28% never consulted a nephrologist to discuss patients at risk of CIN or who had developed CIN. Conclusion: There is highly variable awareness of the definition, impact and risk factors for CIN among European radiologists. Data regarding the importance of CIN in CT are limited. Improved efforts are required to better educate radiologists and referring physicians and to institute appropriate protocols to identify at-risk patients and prevent CIN.

  8. Performance Evaluation and Impact of Weighting Factors on an Energy and Delay Aware Dynamic Source Routing Protocol

    CERN Document Server

    Rekik, Jihen Drira; Ghezala, Henda Ben

    2011-01-01

    Typical applications of the mobile ad-hoc network, MANET, are in disaster recovery operations which have to respect time constraint needs. Since MANET is affected by limited resources such as power constraints, it is a challenge to respect the deadline of a real-time data. This paper proposes the Energy and Delay aware based on Dynamic Source Routing protocol, ED-DSR. ED-DSR efficiently utilizes the network resources such as the intermediate mobile nodes energy and load. It ensures both timeliness and energy efficiency by avoiding low-power and overloaded intermediate mobile nodes. Through simulations, we compare our proposed routing protocol with the basic routing protocol Dynamic Source Routing, DSR. Weighting factors are introduced to improve the route selection. Simulation results, using the NS-2 simulator, show that the proposed protocol prolongs the network lifetime (up to 66%), increases the volume of packets delivered while meeting the data flows real-time constraints and shortens the endto- end delay...

  9. A proposal for a novel impact factor as an alternative to the JCR impact factor.

    Science.gov (United States)

    Yang, Zu-Guo; Zhang, Chun-Ting

    2013-12-03

    One disadvantage of the JCR impact factor, the most commonly used assessment tool for ranking and evaluating scientific journals, is its inability in distinguishing among different shapes of citation distribution curves, leading to unfair evaluation of journals in some cases. This paper aims to put forward an alternative impact factor (IF') that can properly reflect citation distributions. The two impact factors are linearly and positively correlated, and have roughly the same order of magnitude. Because of the ability of IF' in distinguishing among different shapes of citation distribution curves, IF' may properly reflect the academic performance of a scientific journal in a way that is different from the JCR impact factor with some unique features that reward journals with highly cited papers. Therefore, it is suggested that IF' could be used to complement the JCR impact factor.

  10. Conveyor performance impacts mine productivity

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-11-01

    Factors leading to optimum performance of conveyors and conveyor systems with maximum reliability and least downtime are discussed. These include proper management of drives and take-up, predictive maintenance and condition monitoring and use of outsourcing maintenance. Advance in drive and take-up technologies together with computer software and hardware developments will reduce personnel requirements associated with conveyors. 2 photos.

  11. Factors that determine job performance

    Directory of Open Access Journals (Sweden)

    Georgeta Amalasunta Iacob

    2010-12-01

    Full Text Available In today's context is seeking various solutions to determine that employees receive performance at work. Most of the hand is to motivate people in terms of promoting strategic management objectives. Only that the motivation and objectives involved a number of factors that can influence the performance of employees much more than motivation itself. The case study presented in this study will prove this.

  12. Psychological factors affecting equine performance

    Directory of Open Access Journals (Sweden)

    McBride Sebastian D

    2012-09-01

    Full Text Available Abstract For optimal individual performance within any equestrian discipline horses must be in peak physical condition and have the correct psychological state. This review discusses the psychological factors that affect the performance of the horse and, in turn, identifies areas within the competition horse industry where current behavioral research and established behavioral modification techniques could be applied to further enhance the performance of animals. In particular, the role of affective processes underpinning temperament, mood and emotional reaction in determining discipline-specific performance is discussed. A comparison is then made between the training and the competition environment and the review completes with a discussion on how behavioral modification techniques and general husbandry can be used advantageously from a performance perspective.

  13. Business factors related to manufacturing firms' performance

    Directory of Open Access Journals (Sweden)

    Stergios Vranakis

    2014-01-01

    Full Text Available Purpose: The main goal is to understand the way many factors affect the investment decision making process and business performance. Design/methodology/approach: This study proposes a new conceptual framework for examining the reasons that manufacturing firms decide to invest on the acquisition of new machinery and equipment in order to improve their infrastructure. It incorporates various factors related to the internal business environment (quality management, investment decisions etc. Findings and Originality/value: A new conceptual framework, establishing the relations between many factors, has been developed, allowing the determinants of adoption of many implications to be discussed and to relate them to the peculiarities of the Greek manufacturing industry. Originality/value: This study presents an overview of the impact of machinery and equipment investment on firm’s performance, giving grasp for further research of the inter-organizational relationships that exist between them. 

  14. Impact of firm-level factors and market entry mode on performance: A study of service MNCs in an emerging economy

    Directory of Open Access Journals (Sweden)

    George Acheampong

    2012-04-01

    Full Text Available The study examined the market entry strategies of multinational services companies into Ghana’s service sector and the linkages to firm level performance after entry. Literature was reviewed on market entry strategies, internationalisation, globalisation of service firms and resource-based theory. The study adopted a combination of both quantitative and qualitative research approaches in this study. The qualitative approach was for deeper enquiry and quantitative for empirical testing. The study found that firm specific factors affect the market entry strategy while the entry strategy also affects performance after it enters the market. Home country factors and the features of services are also seen to moderate on the effects mentioned. Respondents also indicated that the features of services were an industry wide issue not so much consideration is given to it.

  15. Risk Factors for Malformations and Impact on Reproductive Performance and Mortality Rates of Schmallenberg Virus in Sheep Flocks in the Netherlands

    OpenAIRE

    Luttikholt, Saskia; Veldhuis, Anouk; van den Brom, René; Moll, Lammert; Lievaart-Peterson, Karianne; Peperkamp, Klaas; Van Schaik, Gerdien; Vellema, Piet

    2014-01-01

    In Northwestern Europe, an epizootic outbreak of congenital malformations in newborn lambs due to infection with Schmallenberg virus (SBV) started at the end of 2011. The objectives of this study were to describe clinical symptoms of SBV infection, the effect of infection on mortality rates, and reproductive performance in sheep, as well as to identify and quantify flock level risk factors for SBV infections resulting in malformations in newborn lambs. A case-control study design was used, wi...

  16. Impact of Migraine on School Performance

    Science.gov (United States)

    ... Karceski, MD The impact of migraine on school performance Daniel Kantor, MD e168 WHAT QUESTION DID THE ... overlooked problem: how migraine headache affects the school performance of children. 1 It is bad enough to ...

  17. The Organisational Performance Impact Of ERP Systems On Selected Companies

    OpenAIRE

    Hart, Colin Anthony; Snaddon, Roy Douglas

    2014-01-01

    There is a need to determine the performance benefits that firms gain from enterprise resource planning (ERP) systems, and the factors that contribute to success. Consequently, the central research problem is: To determine the impact of ERP systems on organisational performance by analysing achieved ERP benefits within the framework of a suitable performance measurement system (PMS), and to investigate the association between critical success factors (CSFs) and ERP benefits. A list of...

  18. Country logistics performance and disaster impact.

    Science.gov (United States)

    Vaillancourt, Alain; Haavisto, Ira

    2016-04-01

    The aim of this paper is to deepen the understanding of the relationship between country logistics performance and disaster impact. The relationship is analysed through correlation analysis and regression models for 117 countries for the years 2007 to 2012 with disaster impact variables from the International Disaster Database (EM-DAT) and logistics performance indicators from the World Bank. The results show a significant relationship between country logistics performance and disaster impact overall and for five out of six specific logistic performance indicators. These specific indicators were further used to explore the relationship between country logistic performance and disaster impact for three specific disaster types (epidemic, flood and storm). The findings enhance the understanding of the role of logistics in a humanitarian context with empirical evidence of the importance of country logistics performance in disaster response operations.

  19. The Impact Factors on Heat Transfer Performance of Micro Heat Pipe%微热管传热性能影响因素研究

    Institute of Scientific and Technical Information of China (English)

    张勇

    2015-01-01

    由于具备高效传热性能,微热管在理论研究及各种工程应用领域得到了广泛关注和重视。在微热管的工作循环中,吸液芯是影响其换热性能好坏的关键,吸液芯不但能促使工质液体循环流动,还能促进工质相变,提高热管传热系数。概述了微热管的概念、类型及性能;回顾了微热管的研究历史;综述了微热管全管模型和相变模型的研究现状;分析了微热管的研究思路;最后,展望了其未来可能的发展方向。%The micro heat pipes have a wide concern and attention, such as theory and various practice engineering fields, due to their excellent heat transfer performance. The wick is a key factor to affect the heat transfer performance in working cycle of micro heat pipe. The wick not only could promote the working fluid circulation flow, but also phase change, improving the heat transfer coefficient of micro heat pipe. The paper is overviewed the concept, type and performance of micro heat pipe and reviewed the research history. The micro heat pipe research status mainly include two sides as the whole section and the phase changing section ( evaporation section and condenser section) of heat pipe in heat transfer. Finally, the micro heat pipe research ideas have been analyzed and its possible future research directions prospected.

  20. [Impact factor and/or Hirsch index?].

    Science.gov (United States)

    Gracza, Tünde; Somoskövi, Istvánné

    2007-05-06

    Is the best measure of a scientist's worth the total number of his or her published papers? For many years Institute for Scientific Information has been publishing the lists of impact factors providing quantitative tools for ranking scientists. The impact factor was devised by Eugene Garfield, the founder of the Institute for Scientific Information. Impact factors are calculated each year by the Institute for Scientific Information for those journals which it indexes, and are published in Journal Citation Reports. These measures apply only to journals, not individual articles or individual scientists. For the impact factor of individual scientists, there exists the h-index or Hirsch number. The Hirsch-index (h-index) has recently been defined by Hirsch as a new method for measuring the scientific activity. If a scientist has published n articles which all have been cited at least n times, then he will have a h-index of n . The h-index seeks to describe the impact of individual researchers, rather than journals. The h-index is the result of the balance between the number of publications and the number of citations per publication. H-index: Impact of Individual Scientists. H-index or/and impact factor - it is the question of the future.

  1. Impact of Epilepsy Surgery on Motor Performance

    Directory of Open Access Journals (Sweden)

    J Gordon Millichap

    2005-07-01

    Full Text Available The impact of epilepsy surgery on motor performance of 37 children (ages 1 month to 15 years with refractory seizures was evaluated at the Wilhelmina University Children's Hospital, Utrecht, The Netherlands.

  2. Impact of exercise and vitamin B1 intake on hippocampal brain-derived neurotrophic factor and spatial memory performance in a rat model of stress.

    Science.gov (United States)

    E Dief, Abeer; M Samy, Doaa; I Dowedar, Fatma

    2015-01-01

    Chronic stress affects brain areas involved in learning and emotional responses through modulation of neurotropic factors or neurotransmitters. Therefore, we investigated the role of exercise and thiamine supplementation on spatial memory and on brain-derived neurotrophic factor (BDNF) and acetylcholine (Ach) content in the hippocampus of the stressed animals. Male Wistar rats were randomly assigned to 4 groups (8 rats/group): control group; stress group; swimming and stress group; and thiamine and stress group. All animals were assessed by a T maze for spatial memory or open field test for locomotion and anxiety. BDNF and Ach were estimated in the hippocampus. Chronic immobilization stress resulted in a significant decrease in BDNF and Ach levels in the hippocampus and impairment in spatial memory functions and decreased basal activity. However, either swimming training or thiamine intake for 30 d was proved to induce a significant increase both in BDNF and Ach in conjunction with improved performance in the T maze, marked anxiolytic effect and enhanced ambulation in the open field test, as compared to the stress group. Interestingly, swimming-exercised rats showed significantly higher levels of BDNF versus thiamine-receiving rats, while thiamine-receiving rats showed higher locomotor activity and less freezing behavior in the open field test compared to the swimming group. It was concluded that decreased BDNF and Ach after stress exposure could be a mechanism for the deleterious actions of stress on memory function; swimming exercise or vitamin B1 supplementation for 30 d was a protective tool to improve coping with chronic stress by modulating BDNF and Ach content along with enhancement of memory functions and motor activities.

  3. Risk factors for malformations and impact on reproductive performance and mortality rates of Schmallenberg virus in sheep flocks in the Netherlands.

    Science.gov (United States)

    Luttikholt, Saskia; Veldhuis, Anouk; van den Brom, René; Moll, Lammert; Lievaart-Peterson, Karianne; Peperkamp, Klaas; van Schaik, Gerdien; Vellema, Piet

    2014-01-01

    In Northwestern Europe, an epizootic outbreak of congenital malformations in newborn lambs due to infection with Schmallenberg virus (SBV) started at the end of 2011. The objectives of this study were to describe clinical symptoms of SBV infection, the effect of infection on mortality rates, and reproductive performance in sheep, as well as to identify and quantify flock level risk factors for SBV infections resulting in malformations in newborn lambs. A case-control study design was used, with 93 case flocks that had notified malformed lambs and 84 control flocks with no such lambs. Overall animal seroprevalence in case flocks was estimated at 82.0% (95% CI: 74.3-87.8), and was not significantly different from the prevalence in control flocks being 76.4% (95% CI: 67.2-83.6). The percentages of stillborn lambs or lambs that died before weaning, repeat breeders, and lambs with abnormal suckling behaviour were significantly higher in case flocks compared to control flocks. However, effect of SBV infection on mortality rates and reproductive performance seemed to be limited. Multivariable analysis showed that sheep flocks with an early start of the mating season, i.e. before August 2011 (OR = 33.1; 95% CI: 10.0-109.8) and in August 2011 (OR = 8.2; 95% CI: 2.7-24.6) had increased odds of malformations in newborn lambs caused by SBV compared to sheep flocks with a start of the mating season in October 2011. Other flock-level risk factors for malformations in newborn lambs were purchase of silage (OR 5.0; 95% CI: 1.7-15.0) and flocks with one or more dogs (OR = 3.3; 95% CI: 1.3-8.3). Delaying mating until October could be a potential preventive measure for naïve animals to reduce SBV induced losses. As duration of immunity after infection with SBV is expected to last for several years, future SBV induced congenital malformations are mainly expected in offspring of early mated seronegative animals.

  4. Risk factors for malformations and impact on reproductive performance and mortality rates of Schmallenberg virus in sheep flocks in the Netherlands.

    Directory of Open Access Journals (Sweden)

    Saskia Luttikholt

    Full Text Available In Northwestern Europe, an epizootic outbreak of congenital malformations in newborn lambs due to infection with Schmallenberg virus (SBV started at the end of 2011. The objectives of this study were to describe clinical symptoms of SBV infection, the effect of infection on mortality rates, and reproductive performance in sheep, as well as to identify and quantify flock level risk factors for SBV infections resulting in malformations in newborn lambs. A case-control study design was used, with 93 case flocks that had notified malformed lambs and 84 control flocks with no such lambs. Overall animal seroprevalence in case flocks was estimated at 82.0% (95% CI: 74.3-87.8, and was not significantly different from the prevalence in control flocks being 76.4% (95% CI: 67.2-83.6. The percentages of stillborn lambs or lambs that died before weaning, repeat breeders, and lambs with abnormal suckling behaviour were significantly higher in case flocks compared to control flocks. However, effect of SBV infection on mortality rates and reproductive performance seemed to be limited. Multivariable analysis showed that sheep flocks with an early start of the mating season, i.e. before August 2011 (OR = 33.1; 95% CI: 10.0-109.8 and in August 2011 (OR = 8.2; 95% CI: 2.7-24.6 had increased odds of malformations in newborn lambs caused by SBV compared to sheep flocks with a start of the mating season in October 2011. Other flock-level risk factors for malformations in newborn lambs were purchase of silage (OR 5.0; 95% CI: 1.7-15.0 and flocks with one or more dogs (OR = 3.3; 95% CI: 1.3-8.3. Delaying mating until October could be a potential preventive measure for naïve animals to reduce SBV induced losses. As duration of immunity after infection with SBV is expected to last for several years, future SBV induced congenital malformations are mainly expected in offspring of early mated seronegative animals.

  5. KEY PERFORMING FACTORS OF LEADING ROMANIAN COMPANIES

    Directory of Open Access Journals (Sweden)

    BURJA CAMELIA

    2014-08-01

    Full Text Available The analysis of financial economic ratios provides managers and external partners feedback on the results obtained from operational activities and the associated performance and risks. This paper studies the functional dependence of the companies’ success (on performance over internal financial management elements. The research was carried out for the most traded non-financial securities Bucharest listed companies and covers the period 2011- 2013. To carry out its purpose it analyzed the interdependence between the key financial ratios, studying the impact of liquidity ratios, solvency and efficiency on profitability. The study provides empirical evidences to identify factors that have ensured the performance of companies and their ranking in the segment of the most traded companies in Romania. Results suggest the view that the source of company success on the capital market lies in the positive signals sent to investors regarding profitability and the low risk of solvency. This study gives additional information for managerial decision-making in order to create more value and a better positioning of the companies in the market

  6. A review of electrochromic window performance factors

    Energy Technology Data Exchange (ETDEWEB)

    Selkowitz, S.E.; Rubin, M.; Lee, E.S.; Sullivan, R.; Finlayson, E.; Hopkins, D.

    1994-04-01

    The performance factors which will influence the market acceptance of electrochromic windows are reviewed. A set of data representing the optical properties of existing and foreseeable electrochromic window devices was generated. The issue of reflective versus absorbing electrochromics was explored. This data was used in the DOE 2.1 building energy model to calculate the expected energy savings compared to conventional glazings. The effects of several different control strategies were tested. Significant energy and peak electric demand benefits were obtained for some electrochromic types. Use of predictive control algorithms to optimize cooling control may result in greater energy savings. Initial economic results considering annual savings, cooling equipment cost savings, and electrochromic window costs are presented. Calculations of thermal and visual comfort show additional benefits from electrochromics but more work is needed to quantify their importance. The design freedom and aesthetic possibilities of these dynamic glazings should provide additional market benefits, but their impact is difficult to assess at this time. Ultimately, a full assessment of the market viability of electrochromics must consider the impacts of all of these issues.

  7. Home Environmental Factors Influencing Performance and Progress ...

    African Journals Online (AJOL)

    ... Factors Influencing Performance and Progress of Primary School Pupils in ... found that parents' educational level and income level have a bearing on school ... on school progress and performance, however; home language did play a role.

  8. Author Impact Factor: tracking the dynamics of individual scientific impact

    Science.gov (United States)

    Pan, Raj Kumar; Fortunato, Santo

    2014-05-01

    The impact factor (IF) of scientific journals has acquired a major role in the evaluations of the output of scholars, departments and whole institutions. Typically papers appearing in journals with large values of the IF receive a high weight in such evaluations. However, at the end of the day one is interested in assessing the impact of individuals, rather than papers. Here we introduce Author Impact Factor (AIF), which is the extension of the IF to authors. The AIF of an author A in year t is the average number of citations given by papers published in year t to papers published by A in a period of Δt years before year t. Due to its intrinsic dynamic character, AIF is capable to capture trends and variations of the impact of the scientific output of scholars in time, unlike the h-index, which is a growing measure taking into account the whole career path.

  9. Author Impact Factor: tracking the dynamics of individual scientific impact

    CERN Document Server

    Pan, Raj Kumar

    2013-01-01

    The impact factor (IF) of scientific journals has acquired a major role in the evaluations of the output of scholars, departments and whole institutions. Typically papers appearing in journals with large values of the IF receive a high weight in such evaluations. However, at the end of the day one is interested in assessing the impact of individuals, rather than papers. Here we introduce Author Impact Factor (AIF), which is the extension of the IF to authors. The AIF of an author A in year $t$ is the average number of citations given by papers published in year $t$ to papers published by A in a period of $\\Delta t$ years before year $t$. Due to its intrinsic dynamic character, AIF is capable to capture trends and variations of the impact of the scientific output of scholars in time, unlike the $h$-index, which is a growing measure taking into account the whole career path.

  10. Author Impact Factor: tracking the dynamics of individual scientific impact.

    Science.gov (United States)

    Pan, Raj Kumar; Fortunato, Santo

    2014-05-12

    The impact factor (IF) of scientific journals has acquired a major role in the evaluations of the output of scholars, departments and whole institutions. Typically papers appearing in journals with large values of the IF receive a high weight in such evaluations. However, at the end of the day one is interested in assessing the impact of individuals, rather than papers. Here we introduce Author Impact Factor (AIF), which is the extension of the IF to authors. The AIF of an author A in year t is the average number of citations given by papers published in year t to papers published by A in a period of Δt years before year t. Due to its intrinsic dynamic character, AIF is capable to capture trends and variations of the impact of the scientific output of scholars in time, unlike the h-index, which is a growing measure taking into account the whole career path.

  11. User and Performance Impacts from Franklin Upgrades

    Energy Technology Data Exchange (ETDEWEB)

    He, Yun (Helen)

    2009-05-10

    The NERSC flagship computer Cray XT4 system"Franklin" has gone through three major upgrades: quad core upgrade, CLE 2.1 upgrade, and IO upgrade, during the past year. In this paper, we will discuss the various aspects of the user impacts such as user access, user environment, and user issues etc from these upgrades. The performance impacts on the kernel benchmarks and selected application benchmarks will also be presented.

  12. [Obtaining the Impact Factor by Ginekologia Polska].

    Science.gov (United States)

    Spaczyński, Marek; Januszek-Michalecka, Lucyna; Nowak-Markwitz, Ewa; Kedzia, Witold; Spaczyński, Robert; Karowicz-Bilińska, Agata

    2011-08-01

    Scientific journals are ranked and evaluated to measure their relative importance and influence on science within a specific field. One of the tools most widely used to evaluate and compare journals is the Thomson Reuters Impact Factor In Poland a specific value of a scientist's Impact Factor is required for academic promotion. Ginekologia Polska was placed on the Master Journal List in 2008 in the result of changes introduced in 2007 by the new Chief Editor prof. Marek Spaczynski. In 2010, first time in its history the journal was listed in the Journal Citation Reports with the Impact Factor 0.367. The analysis of Ginekologia Polska contemporary value, as well as of prospects for its development was conducted on the basis of the Journal Citation Reports. In the light of the JCR data, Ginekologia Polska is a highly regarded title compared to other Polish journals. Its value and importance is gradually growing.

  13. The impact of workplace conditions on firm performance

    DEFF Research Database (Denmark)

    Buhai, Ioan Sebastian; Cottini, Elena; Westergård-Nielsen, Niels Chr.

    This paper estimates the impact of work environment health and safety practice on firm performance, and examines which firm-characteristic factors are associated with good work conditions. We use Danish longitudinal register matched employer-employee data, merged with firm business accounts and d...

  14. Homesickness at College: Its Impact on Academic Performance and Retention

    Science.gov (United States)

    Sun, Jie; Hagedorn, Linda Serra; Zhang, Yi

    2016-01-01

    For this study we identified factors exerting significant influence on homesickness and explored the impact of the homesick experience on students' academic performance and retention in the first year in college. The findings reveal 2 constructs underlying the homesickness scale: homesick separation and homesick distress. Demographic variables…

  15. THE IMPACT OF LEADERSHIP ON ORGANIZATIONAL PERFORMANCE

    Directory of Open Access Journals (Sweden)

    Raluca-Elena HURDUZEU

    2015-04-01

    Full Text Available An organization is considered to be effective if it finds the balance between the demands of various stakeholders (owners, employees, customers, community and the needs of the employees. We believe that an appropriate leadership style can influence and ensure the prosperity and the economic growth of both the organization and employees. Therefore, the aim of the paper is to explore the impact of leadership styles on the organizational performance. Our main focus is on transformational leadership and its role in facilitating the increase in organizational performance. Transformational leaders inspire individuals within the organizations to work harder and to strive for the highest levels of performance. We begin by underlining the connection between transformational leadership and organizational performance, we provide examples on transformational leadership practices’ impact the organizations and we conclude by making some future research propositions.

  16. THE IMPACT OF LEADERSHIP ON ORGANIZATIONAL PERFORMANCE

    Directory of Open Access Journals (Sweden)

    Raluca-Elena HURDUZEU

    2015-04-01

    Full Text Available An organization is considered to be effective if it finds the balance between the demands of various stakeholders (owners, employees, customers, community and the needs of the employees. We believe that an appropriate leadership style can influence and ensure the prosperity and the economic growth of both the organization and employees. Therefore, the aim of the paper is to explore the impact of leadership styles on the organizational performance. Our main focus is on transformational leadership and its role in facilitating the increase in organizational performance. Transformational leaders inspire individuals within the organizations to work harder and to strive for the highest levels of performance. We begin by underlining the connection between transformational leadership and organizational performance, we provide examples on transformational leadership practices’ impact the organizations and we conclude by making some future research propositions.

  17. Associated factors to academic performance in adult

    Directory of Open Access Journals (Sweden)

    Mawency Vergel-Ortega

    2016-08-01

    Full Text Available The article has the objective identify the associated factors to academic performance of adult students in mathematics and statistics modules. Was realized a study quantitative correlational in a sample of 80 students with age over 30 years old. A group of institutional aspects, social-demographics, psychosocials and pedagogic factors were used as independent variable. Results indicate that style of learning associated with type of intelligence, deficit conscience associated to abstraction capability and family motivation predicts the higher levels of performance, constituting explicative variables. Conclusion: type and style of learning, type of intelligence, motivation, conscience of deficit are associated factors to performance in adults.

  18. Impact Factors for Reggeon-Gluon Transitions

    CERN Document Server

    Fadin, V S

    2015-01-01

    General expressions for the impact factors up to terms vanishing at the space-time dimension $D\\rightarrow 4$ are presented. Their infrared behaviour is analysed and calculation of exact in $D\\rightarrow 4$ asymptotics at small momenta of Reggeized gluons is discussed.

  19. The impact of Ajax on network performance

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Web 2.0 has been becoming the new tendency of the Internet development. In order to get better management of web 2.0 network resource and guarantee of service quality, the architecture and the advantages of web 2.0 over Ajax technology is analyzed, and the impact of Ajax on bandwidth performance of web application is discussed.

  20. Factors Associated with Student Performance in Financial Accounting Course

    Directory of Open Access Journals (Sweden)

    Ali Uyar

    2011-10-01

    Full Text Available In order to investigate factors associated with student performance in accounting course, eight variables that are likely to have impact on student performance were determined. The results indicated that gender and score in university entrance examination are not significantly correlated with student performance. Age of the student has negative significant influence on student performance. High school grade point average, prior knowledge of accounting, grade point average, attendance, and math grade are all significantly related to student performance in the financial accounting course.

  1. Factors affecting effective performance of rural producers ...

    African Journals Online (AJOL)

    Mo

    Factors affecting effective performance of rural producers' organizations in the ... Linkages are vital for effective achievement of purposes and most RPOs (80%), had established them ..... Success: Learning from Instructive Experiences in Ru-.

  2. The Impact of Stressors on Military Performance

    Science.gov (United States)

    2013-12-01

    Physiological and cognitive responses to events that disrupt a person’s equilibrium can be affected by other factors such as their mood and...example, Conrad et al. (2010) found that background classical music had no impact on accuracy of laparoscopic surgery experts, although they took longer...function and mood during acute cold stress after extended military training and recovery. Aviation, Space, and Environmental Medicine, 80, 629-636

  3. Linking Success Factors to Financial Performance

    Directory of Open Access Journals (Sweden)

    Sivasamy Mothilal

    2011-01-01

    Full Text Available Problem statement: Based on a literature survey, an attempt has been made in this study to develop a framework for identifying the success factors. In addition, a list of key success factors is presented. The emphasis is on success factors dealing with breadth of services, internationalization of operations, industry focus, customer focus, 3PL experience, relationship with 3PLs, investment in quality assets, investment in information systems, availability of skilled professionals and supply chain integration. In developing the factors an effort has been made to align and relate them to financial performance. Conclusion/Recommendations: We found success factors relationship with 3PLs and skilled logistics professionals would substantially improves financial performance metric profit growth. Our findings also contribute to managerial practice by offering a benchmarking tool that can be used by managers in the 3PL service provider industry in India.

  4. Median Citation Index vs Journal Impact Factor

    Science.gov (United States)

    Antonoyiannakis, Manolis

    2015-03-01

    The Journal Impact Factor is an arithmetic mean: It is the average number of citations, in a year, to a journal's articles that were published the previous two years. But for the vast majority of scholarly journals, the distribution of these citations is skewed (non-symmetric). We argue that a more representative member of the skewed distribution of citations is its median, not the mean. We thus introduce the Median Citation Index (MCI) and compare it to the journal Impact Factor (JIF) as a potentially more suitable choice of the ``center'' of the distribution, or its typical value. Unlike the JIF, the MCI is far less sensitive to outlier (very highly cited) papers or to gaming, and does not lend itself to the hype of calculating it to three decimal digits.

  5. Chinese life cycle impact assessment factors

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The methodological basis and procedures for determination ofChinese normalization references and weighting factors according to the EDIP-method is described. According to Chinese industrial development intensity and population density, China was divided into three regions and the normalization references for each region were calculated on the basis of an inventory of all of the region's environmental emissions in 1990. The normalization reference was determined as the total environmental impact potential for the area in question in 1990(EP(j)90) divided by the population. The weighting factor was determined as the normalization reference (ER(j)90) divided by society's target contribution in the year 2000 based on Chinese political reduction plans, ER(j)T2000.). This paper peessents and discuss resubts obtained for eight different environmental impact categories relevant for China:global warming,hazardous waste and slag and ashes.

  6. Impact of Psychological Empowerment on Nonfinancial Performance

    OpenAIRE

    Hemedoğlu, Enis; KOÇAK, Mahmut; ÖZKAN, Aslıhan; Başak Melek BERBEROĞLUGİL

    2012-01-01

    This study examines the effects of psychological empowerment on nonfinancial performance of organizations. The sample of the research consists of 70 employees of an enterprise serving in health sector. “Impact”, “competence” and “meaning” dimensions for psychological empowerment and “customer perspective”, “internal processes perspective” and “learning and growth perspective” dimensions for nonfinancial performance are derived from factor analysis. There is a significant negative relationship...

  7. [The "impact factor" and the impact of medical journals].

    Science.gov (United States)

    Reyes, H

    1998-02-01

    Original articles published in scientific journals are important parameters for committees when they evaluate academic promotions or research grant applications. The analysis usually tries to give each paper a qualitative/quantitative assessment. An article's citation by others is accepted as a fair estimate of the value assigned to its originality and importance. A main determinant of every citation index is the international relevance attained by the journal where the article appeared. The "impact factor" of journals enlisted in the mainstream literature, as defined by the Journal Citation Reports (ISI), is being used by many assessors worldwide. But this index appears to be an unfair unit of measurement for journals that, although included in the main international data bases, are published in non-English languages. Furthermore, some local journals that are not enlisted by the Institute for Scientific Information apply external peer review to select their publications. In contrast, those same journals may have great relevance for their contributing authors and a high impact in their readers. The Editor's proposal is to classify original articles published in biomedical sciences, clinical medicine and public health topics using a three steps scale: a low score to articles published in local journals that use the peer review system, even though they were not enlisted in international data bases; a higher score to articles published in journals included in the mainstream literature, without considering their "impact factors" as differential values; and the highest score to articles published in journals recognized as international leaders in biomedicine, general medicine or in the subspecialties. Therefore, mainstream journals published in non-English languages would not be discriminated from other journals having higher "impact factors" mainly due to their use of the English language.

  8. The Organisational Performance Impact Of ERP Systems On Selected Companies

    Directory of Open Access Journals (Sweden)

    Hart, Colin Anthony

    2014-05-01

    Full Text Available There is a need to determine the performance benefits that firms gain from enterprise resource planning (ERP systems, and the factors that contribute to success. Consequently, the central research problem is: To determine the impact of ERP systems on organisational performance by analysing achieved ERP benefits within the framework of a suitable performance measurement system (PMS, and to investigate the association between critical success factors (CSFs and ERP benefits. A list of expected ERP benefits and CSFs is compiled. Performance measurement models are evaluated, and one model is designed to evaluate ERP impact. ERP experts refine identified ERP benefits and CSFs using structured interviews. These are built into a questionnaire, and used to survey South African (SA companies in manufacturing, mining, and power generation. Results indicate that business benefits are realised by companies that implement ERP systems. By building benefits into the performance measurement model, a positive impact on organisational performance is observed. Although a core list of CSFs is identified, and three associations are found between CSFs and ERP benefits, further research is needed.

  9. Impact of Performance Management in Public and Private Organizations

    DEFF Research Database (Denmark)

    Hvidman, Ulrik; Andersen, Simon Calmar

    2014-01-01

    Recent theoretical developments suggest that management actions have different impacts on outcomes in public and private organizations. This proposition is important to public organizations’ widespread import of private sector management tools such as performance management. This article examines...... how performance management influences performance outcomes in otherwise similar public and private organizations. Showing that the factors expected to diminish the impact of performance management parallel the organizational characteristics of public organizations, we hypothesize that this type...... of management is less effective in public organizations. A difference-in-differences model based on survey data on management in Danish public and private schools, combined with administrative data of students’ test scores, confirms the hypothesis. The results have important implications for the transfer...

  10. Improving human performance: Industry factors influencing the ability to perform

    Directory of Open Access Journals (Sweden)

    Güera Massyn Romo

    2013-03-01

    Full Text Available Learning interventions and new technologies that aim to improve human performance must take cognisance of industry factors inhibiting human performance. The dynamic and fast pace nature of the Information and Communication Technologies (ICT and the engineering industries do not lend themselves to proper skills planning and management. These industries experience real skills gaps, to some of which they contribute by themselves. This study reports on these performance-inhibiting factors such as the underutilisation of available skills, tolerance for individual preferences, and dynamically, and informally refining a role objective while an employee is occupying a certain role. The important professional skills required by individuals to cope with these real life factors are also explored in the skills gaps management context. Moreover, these industries need a profile they refer to as Special Forces, which denotes a high calibre of worker that possesses well-developed professional skills whilst having advanced technical expertise and sufficient experience. This resource profile is required largely due to the poor management of human resource processes in practice and the current reported lack of adequate skills. Furthermore, this study refers to the recent lack of a working definition for these Special Forces leading to the omitted active development of these profiles in industry today, which appears to become a key human performance inhibiting factor.

  11. Reviewing Impact Factor to Evaluate the Quality of Journals

    Directory of Open Access Journals (Sweden)

    Laleh Samadi

    2011-10-01

    Full Text Available Impact Factor is one of the most important tools to evaluate journals in ISI. In this article, have been tried to extract factors increase the journals' impact factor via studying the literatures and also introduce the factors that may be effective in reducing the weaknesses. The effect of factors such as interval, national, and individual motivations to increase the impact factor of journals and also issues that should be considered when calculating the impact factor, comprised some of the contents of this paper. At the end of the study, in order to evaluate the effect of using the optimal impact factor of journals, some recommendations were presented.

  12. MODERN FACTORS THAT ENHANCE COMPANY'S FINANCIAL PERFORMANCE

    Directory of Open Access Journals (Sweden)

    Gruian Claudiu-Marian

    2011-12-01

    Full Text Available Company performance varies among economic sectors, countries and regions. It is influenced by a very large number of factors. This study aims at identifying and analyzing the determinants that must be considered by company's management presently in order to face competition and achieve superior financial performance. The research methodology used is specific for the theoretic nature of the article and includes literature review, comparative analysis and synthesis. Results validate and argue as relevant modern factors that influence the performance of contemporary companies: organizational culture, corporate social responsibility, innovation, knowledge spillovers. Study limits refer to the fact that these four factors are not entirely responsible for modern business performance and future research should be done to develop an integrative point of view on overall performance determinants. This paper is a dissemination of the results obtained by the author in the doctoral program The financial performance of EU member states companies, coordinator: Professor Carmen Corduneanu, PhD, carried out within West University of Timisoara, Romania, in the period October 2010- July 2012.

  13. Web Impact Factors for Iranian Universities

    Directory of Open Access Journals (Sweden)

    Alireza Noruzi

    2005-04-01

    Full Text Available This study investigates the Web Impact Factors (WIFs for Iranian universities and introduces a new system of measurement. Counts of links to the web sites of Iranian universities were calculated from the output of AltaVista search engine. The WIFs for Iranian universities were calculated by dividing link page counts by the number of pages found in AltaVista for each university at a given point in time. These WIFs were then compared, to study the impact, visibility, and influence of Iranian university web sites. Overall, Iranian university web sites have a low inlink WIF. While specific features of sites may affect an institution's Web Impact Factor, there is a significant correlation between the proportion of English-language pages at an institution's site and the institution's backlink counts. This indicates that for linguistic reasons, Iranian (Persian-language web sites may not receive and attract the attention that they deserve from the World Wide Web. This raises the possibility that information may be ignored due to linguistic and geographic barriers, and this should be taken into account in the development of the global Web.

  14. Theoretical difference between impact factor and influence factor

    Directory of Open Access Journals (Sweden)

    Đilda Pečarić

    2010-06-01

    Full Text Available Bibliometric constructions of "knowledge maps" and "cognitive structures of science" do not differentiate between impact and influence factors. The difference can be constructedaccording to different meaning and interpretation of the terms reference and citation. Reference is "acknowledgment which one author gives to another", whereas citation is "acknowledgment which one document receives from another". Development of Information Science according to period and subject area is analyzed on the corpus of citation literature retrieved from doctoral dissertations in Information Science from 1978 to 2007 at Croatian universities. The research aim is to indicate the difference between document impact factor and author's influence factor (i.e. reference ability to produce effects on actions, behavior, and opinions of authors of doctoral theses. The influence factor serves to distinguish the key role of cited authors in time and according to the duration of the influence (the average age for cited papers of dominant authors in different periods is between eight and ten years. The difference between linear and interactive communication seems vital for the interpretation of cited half-life, i.e. the attitude of one science community towards used information resources and cognitive heritage. The analyzed corpus of 22,210 citations can be divided into three communication phases according to influence factor criteria: in the phase of dialogue and interactive communication 25% of bibliographic units are cited in the first four years; in the second phase another 25% of units are cited from the fifth to the ninth year; after ten years, in the dominant linear communication phase, approximately 30% of units are cited.

  15. Confirmatory factor analysis of the Oral Health Impact Profile.

    Science.gov (United States)

    John, M T; Feuerstahler, L; Waller, N; Baba, K; Larsson, P; Celebić, A; Kende, D; Rener-Sitar, K; Reissmann, D R

    2014-09-01

    Previous exploratory analyses suggest that the Oral Health Impact Profile (OHIP) consists of four correlated dimensions and that individual differences in OHIP total scores reflect an underlying higher-order factor. The aim of this report is to corroborate these findings in the Dimensions of Oral Health-Related Quality of Life (DOQ) Project, an international study of general population subjects and prosthodontic patients. Using the project's Validation Sample (n = 5022), we conducted confirmatory factor analyses in a sample of 4993 subjects with sufficiently complete data. In particular, we compared the psychometric performance of three models: a unidimensional model, a four-factor model and a bifactor model that included one general factor and four group factors. Using model-fit criteria and factor interpretability as guides, the four-factor model was deemed best in terms of strong item loadings, model fit (RMSEA = 0·05, CFI = 0·99) and interpretability. These results corroborate our previous findings that four highly correlated factors - which we have named Oral Function, Oro-facial Pain, Oro-facial Appearance and Psychosocial Impact - can be reliably extracted from the OHIP item pool. However, the good fit of the unidimensional model and the high interfactor correlations in the four-factor solution suggest that OHRQoL can also be sufficiently described with one score.

  16. Impact of emotional intelligence on job performance

    Directory of Open Access Journals (Sweden)

    Marjanca Krajnc

    2012-06-01

    Full Text Available RQ: To determine whether emotional intelligence has an impact on motivation and how this can affect work performance.Purpose: High work performance of individuals in an organization can be achieved with a high level of motivation that is directly derived from emotional intelligence. Because the impact of emotional intelligence in organizations is under-researched and is not sufficiently included in the scope of management, there is a need tofurther explore this topic.Method: Qualitative analysis in the form of interviews and quantitative analysis in the form of a survey was used in this study. Details of interviews with employees were analyzed according to the rules of qualitative methods. The data obtained in the survey were analyzed with a chi-square test.Results: The results showed that emotional intelligence has a significant impact on motivation and that emotionally motivated person works more and better.Organization: Management can take these research findings into consideration during the human resources management process, and in the procedures of a comprehensive development of individual’s personal potential. The result of the research findings can be used bymanagement, supervisors, and all employees as a method to establish better motivational climate.Society: With a similar, but wider purpose, the findings of this research can be taken into account in the wider social environment, particularly in the field of public administration and media.Originality: In Slovenian organizations, research on this topic and in this combination has not yet been performed.Limitations: The sample is small and limited to only one major successful Slovenian company. It takes into account only the influence of motivation that comes from emotional intelligence.

  17. Impact of Metacognition on Guitar Performance Achievement

    OpenAIRE

    Yokuş, Tuba

    2013-01-01

    This study has been carried out to determine the impact of the development of metacognition on guitar performance achievement in the individual instrument guitar lesson, which is included in the Bachelor’s program of Music Teacher Education in Marmara University Atatürk Faculty of Education, Department of Fine Arts Education, in Turkey. “Experimental Design with Pretest–Posttest Control Group” has been used, in order to achieve the objective of the study. The study sample (N=10) consists of g...

  18. Impact maturity times and citation time windows: The 2-year maximum journal impact factor

    CERN Document Server

    Dorta-Gonzalez, Pablo

    2013-01-01

    Journal metrics are employed for the assessment of scientific scholar journals from a general bibliometric perspective. In this context, the Thomson Reuters journal impact factors (JIF) are the citation-based indicators most used. The 2-year journal impact factor (2-JIF) counts citations to one and two year old articles, while the 5-year journal impact factor (5-JIF) counts citations from one to five year old articles. Nevertheless, these indicators are not comparable among fields of science for two reasons: (i) each field has a different impact maturity time, and (ii) because of systematic differences in publication and citation behaviour across disciplines. In fact, the 5-JIF firstly appeared in the Journal Citation Reports (JCR) in 2007 with the purpose of making more comparable impacts in fields in which impact matures slowly. However, there is not an optimal fixed impact maturity time valid for all the fields. In some of them two years provides a good performance whereas in others three or more years are...

  19. AGU journals continue to rank highly in Impact Factors

    Science.gov (United States)

    Sears, Jon; Warner, Mary

    2012-07-01

    AGU journals continue to rank highly in the 2011 Journal Citation Reports (JCR), which was released by Thomson Reuters on 28 June. The impact factor of several AGU journals increased significantly, continuing their trend over the previous 5 years, while others remained consistent with the previous year's ranking. Paleoceanography is an outstanding performer in both the Paleontology and Oceanography categories. Since 1995, Paleoceanography has been the top-ranked journal in the Paleontology category (of 49 titles in 2011), with an Impact Factor of 3.357. In the Oceanography group (59 journals total), Paleoceanography ranks third in Impact Factor. Reviews of Geophysics, with an Impact Factor of 12.364 (an increase of 2.826 from the prior year's score of 9.538), ranks second in Geochemistry and Geophysics out of a total of 77 journals in this cohort. Water Resources Research comes in at second place in the Limnology group, with 19 titles, and third place in the Water Resources group, which has a cohort of 78 titles.

  20. Impact of Emotional Intelligence on Performance of Employees

    Directory of Open Access Journals (Sweden)

    Hassan JORFI

    2010-12-01

    Full Text Available Emotional intelligence is essential factor responsible for determining success in life and psychological wellbeing seems to play an important role in shaping the interaction between managers and employees in their work environment. This study is undertaken to understand the performance level of managers and employees in educational administrations of Iran, the study focuses on understanding the emotional intelligence of the managers and employees and its link to their performance level on the job. Little research to date has examined how emotional intelligence influence manager-employee performance in organizations settings. Data (N=155 for this study were collected through questionnaires that participants were managers and employees of educational administrations of Iran Building on top of emotional intelligence theory, this paper explores how emotional intelligence manager and employee are influenced by performance. Today’s environment is global and very complex, and the association between emotional intelligence and performance in establishments of Iran remains an important area of worry for managers and employees’ globally. Emotional intelligence is crucial factor for organization’s performance and growth and plays an important role in performance of today’s competitive organizations. The findings of the study indicate that emotional intelligence has a positive impact on the performance level of the managers and employees in educational administrations of Iran.

  1. Impact of yoga way of life on organizational performance

    Directory of Open Access Journals (Sweden)

    Adhia Hasmukh

    2010-01-01

    Full Text Available Background: Organizational performance can be attributed to a number of factors. However, there are certain organizational factors, the presence or absence of which can determine the success or failure of the organization. There are different ways in which organizations try to improve their performance by working on such factors. In the research presented in this article, an attempt is made to find out whether adoption of the Yoga Way of Life by managers can have a positive impact on such organizational performance indicators. Aims: To measure effect of yoga way of life on five different indicators through an empirical study. Materials and Methods: The five indicators are job satisfaction, job involvement, goal orientation, affective organizational commitment and organizational citizenship behavior. Statistics Analysis: Pre- and post-data was measured using self-reported questionnaire. Independent T-test (Paired and Pearson′s correlation test were conducted using SPSS. Results and Conclusion: The results of the study show that Yoga has a significant positive impact on four out of five of these indicators. Only job involvement does not show significant improvement. The construct used for measuring job involvement had a Chronbach alpha of 0.613, which is an indicator of moderate reliability, which could be the main reason for not getting positive result.

  2. Impact of yoga way of life on organizational performance

    Science.gov (United States)

    Adhia, Hasmukh; Nagendra, HR; Mahadevan, B

    2010-01-01

    Background: Organizational performance can be attributed to a number of factors. However, there are certain organizational factors, the presence or absence of which can determine the success or failure of the organization. There are different ways in which organizations try to improve their performance by working on such factors. In the research presented in this article, an attempt is made to find out whether adoption of the Yoga Way of Life by managers can have a positive impact on such organizational performance indicators. Aims: To measure effect of yoga way of life on five different indicators through an empirical study. Materials and Methods: The five indicators are job satisfaction, job involvement, goal orientation, affective organizational commitment and organizational citizenship behavior. Statistics Analysis: Pre- and post-data was measured using self-reported questionnaire. Independent T-test (Paired) and Pearson’s correlation test were conducted using SPSS. Results and Conclusion: The results of the study show that Yoga has a significant positive impact on four out of five of these indicators. Only job involvement does not show significant improvement. The construct used for measuring job involvement had a Chronbach alpha of 0.613, which is an indicator of moderate reliability, which could be the main reason for not getting positive result. PMID:21170231

  3. Impact factor and its role in academic promotion

    Directory of Open Access Journals (Sweden)

    Richard Russell

    2009-07-01

    Full Text Available Richard Russell,1 Dave Singh21Wrexham Park Hospital, Berkshire, UK; 2Northwest Lung Research Centre, South Manchester University Hospitals Trust, Manchester, UKThis statement was adopted unanimously at the May 17, 2009 meeting of the International Respiratory Journal Editors Roundtable.In our collective experience as editors of international peer-reviewed journals, we propose that the impact factor calculated for individual journals should not be used as a basis for evaluating the significance of an individual scientist’s past performance or scientific potential. There are several reasons not to equate the impact factor of a journal in which the scientist publishes with the quality of the scientist’s research.

  4. Environmental Factors Impacting Bone-Relevant Chemokines

    Science.gov (United States)

    Smith, Justin T.; Schneider, Andrew D.; Katchko, Karina M.; Yun, Chawon; Hsu, Erin L.

    2017-01-01

    Chemokines play an important role in normal bone physiology and the pathophysiology of many bone diseases. The recent increased focus on the individual roles of this class of proteins in the context of bone has shown that members of the two major chemokine subfamilies—CC and CXC—support or promote the formation of new bone and the remodeling of existing bone in response to a myriad of stimuli. These chemotactic molecules are crucial in orchestrating appropriate cellular homing, osteoblastogenesis, and osteoclastogenesis during normal bone repair. Bone healing is a complex cascade of carefully regulated processes, including inflammation, progenitor cell recruitment, differentiation, and remodeling. The extensive role of chemokines in these processes and the known links between environmental contaminants and chemokine expression/activity leaves ample opportunity for disruption of bone healing by environmental factors. However, despite increased clinical awareness, the potential impact of many of these environmental factors on bone-related chemokines is still ill defined. A great deal of focus has been placed on environmental exposure to various endocrine disruptors (bisphenol A, phthalate esters, etc.), volatile organic compounds, dioxins, and heavy metals, though mainly in other tissues. Awareness of the impact of other less well-studied bone toxicants, such as fluoride, mold and fungal toxins, asbestos, and chlorine, is also reviewed. In many cases, the literature on these toxins in osteogenic models is lacking. However, research focused on their effects in other tissues and cell lines provides clues for where future resources could be best utilized. This review aims to serve as a current and exhaustive resource detailing the known links between several classes of high-interest environmental pollutants and their interaction with the chemokines relevant to bone healing. PMID:28261155

  5. Factors Influencing the Performance of Coal Briquettes

    Directory of Open Access Journals (Sweden)

    Unsia HABIB

    2014-01-01

    Full Text Available The continuous supply of energy resources is essential for the development of any nation. The economic and social life of any nation depends enormously on the energy resources. Over the past few years the energy crisis is becoming a major issue in developing countries as Pakistan. Oil, Natural gas and hydro are the three major energy resources of the Pakistan. These conventional energy resources were being exploited in the past leading to an issue of energy crisis in the country. Replacing expensive imported energy resources with coal briquettes made from indigenous coal reserves can provide fuel for the local residential and commercial markets. Coal briquettes formation is a process to convert coal powder into a specific shape with the help of a binder. An external force is applied to the coal binder mixture to make a firm body of desired shape. The briquettes formed this way will not disintegrate under normal conditions of transportation and use. Coal briquettes are preferred over raw coal because they are a smokeless, strong and low emissive fuel that can be used in numerous domestic and commercial applications. The performance of coal briquettes formed is dependent largely upon its thermal properties and the mechanical strength. Nowadays an environmentally safe briquettes formation process is also included in the performance criteria of coal briquettes. The mechanical strength of coal briquettes affects its storage and transportation to the intended market. The studies on coal briquettes show that coal briquettes quality depends on many factors like the type of binder, quantity of binder, grade of coal, moisture level, coal particle size and its distribution etc. These factors along with some of the factors as time of compaction, compaction temperature, and compaction pressure and moisture level are discussed in this paper to evaluate the performance of briquetting technology in future.

  6. Alcohol: impact on sports performance and recovery in male athletes.

    Science.gov (United States)

    Barnes, Matthew J

    2014-07-01

    Alcohol is the most commonly used recreational drug globally and its consumption, often in large volume, is deeply embedded in many aspects of Western society. Indeed, athletes are not exempt from the influence alcohol has on society; they often consume greater volumes of alcohol through bingeing behaviour compared with the general population, yet it is often expected and recommended that athletes abstain from alcohol to avoid the negative impact this drug may have on recovery and sporting performance. While this recommendation may seem sensible, the impact alcohol has on recovery and sports performance is complicated and depends on many factors, including the timing of alcohol consumption post-exercise, recovery time required before recommencing training/competition, injury status and dose of alcohol being consumed. In general, acute alcohol consumption, at the levels often consumed by athletes, may negatively alter normal immunoendocrine function, blood flow and protein synthesis so that recovery from skeletal muscle injury may be impaired. Other factors related to recovery, such as rehydration and glycogen resynthesis, may be affected to a lesser extent. Those responsible for the wellbeing of athletes, including the athlete themselves, should carefully monitor habitual alcohol consumption so that the generic negative health and social outcomes associated with heavy alcohol use are avoided. Additionally, if athletes are to consume alcohol after sport/exercise, a dose of approximately 0.5 g/kg body weight is unlikely to impact most aspects of recovery and may therefore be recommended if alcohol is to be consumed during this period.

  7. Factors influencing aircraft ground handling performance

    Science.gov (United States)

    Yager, T. J.

    1983-01-01

    Problems associated with aircraft ground handling operations on wet runways are discussed and major factors which influence tire/runway braking and cornering traction capability are identified including runway characteristics, tire hydroplaning, brake system anomalies, and pilot inputs. Research results from tests with instrumented ground vehicles and aircraft, and aircraft wet runway accident investigation are summarized to indicate the effects of different aircraft, tire, and runway parameters. Several promising means are described for improving tire/runway water drainage capability, brake system efficiency, and pilot training to help optimize aircraft traction performance on wet runways.

  8. On the Behavior of Journal Impact Factor Rank-Order Distribution

    OpenAIRE

    R. Mansilla; Köppen, E.; Cocho, G.; Miramontes, P.

    2006-01-01

    An empirical law for the rank-order behavior of journal impact factors is found. Using an extensive data base on impact factors including journals on Education, Agrosciences, Geosciences, Biosciences and Environ- mental, Chemical, Computer, Engineering, Material, Mathematical, Medical and Physical Sciences we have found extremely good fits out- performing other rank-order models. Some extensions to other areas of knowledge are discussed.

  9. Impact of aging and material structure on CANDU plant performance

    Energy Technology Data Exchange (ETDEWEB)

    Nadeau, E.; Ballyk, J.; Ghalavand, N. [Candu Energy Inc., Mississauga, Ontario (Canada)

    2011-07-01

    In-service behaviour of pressure tubes is a key factor in the assessment of safety margins during plant operation. Pressure tube deformation (diametral expansion) affects fuel bundle dry out characteristics resulting in reduced margin to trip for some events. Pressure tube aging mechanisms also erode design margins on fuel channels or interfacing reactor components. The degradation mechanisms of interest are primarily deformation, loss of fracture resistance and hydrogen ingress. CANDU (CANada Deuterium Uranium, a registered trademark of the Atomic Energy of Canada Limited used under exclusive licence by Candu Energy Inc.) owners and operators need to maximize plant capacity factor and meet or exceed the reactor design life targets while maintaining safety margins. The degradation of pressure tube material and geometry are characterized through a program of inspection, material surveillance and assessment and need to be managed to optimize plant performance. Candu is improving pressure tubes installed in new build and life extension projects. Improvements include changes designed to reduce or mitigate the impact of pressure tube elongation and diametral expansion rates, improvement of pressure tube fracture properties, and reduction of the implications of hydrogen ingress. In addition, Candu provides an extensive array of engineering services designed to assess the condition of pressure tubes and address the impact of pressure tube degradation on safety margins and plant performance. These services include periodic and in-service inspection and material surveillance of pressure tubes and deterministic and probabilistic assessment of pressure tube fitness for service to applicable standards. Activities designed to mitigate the impact of pressure tube deformation on safety margins include steam generator cleaning, which improves trip margins, and trip design assessment to optimize reactor trip set points restoring safety and operating margins. This paper provides an

  10. Impact of Transformational Leadership on Job Performance

    Directory of Open Access Journals (Sweden)

    Jeevan Jyoti

    2015-11-01

    Full Text Available The present study focuses on the role of leader–member exchange and relational identification (RI between transformational leadership and job performance relationship. The model has been tested in higher education sector. All the permanent teachers working in higher education sector were contacted. The data have been duly validated with the help of confirmatory factor analysis (CFA. Reliability has been assessed through Cronbach’s alpha and composite reliability. Structural equation modeling (SEM has been used for hypotheses testing, and hierarchical regression has been used to test the moderating effect of RI. The results indicated that leader–member exchange acts as a mediator and RI acts as a moderator instead of mediator. The managerial implications and future scope have been discussed.

  11. MICROECONOMIC FACTORS AFFECTING BANKS’ FINANCIAL PERFORMANCE: THE CASE OF ROMANIA

    Directory of Open Access Journals (Sweden)

    Lavinia Mihaela GUŢU

    2015-04-01

    Full Text Available Banks are important cells in the economy as they have a significant role by maintaining and encouraging the development of economic sectors. They refocus the resources from those who have surplus to those which have a deficit. Therefore, as any other enterprises, performance is highly desirable for banks and, then, it is crucial to discover what the main factors that influence this objective are. So, this paper analyzes the microeconomic factors affecting bank’s financial performance focusing on 11 entities for the period between 2003 and 2013. The performance is measured by return on assets. The independent variables used are bank’s size, financial leverage,loans to assets ratio, deposits to assets ratio, number of employees, liquidity, net result and monetary policy rate. The results show that bank’s size, loans to assets ratio and liquidity have not a significant impact on performance. Financial leverage has a negative impact, meanwhile the number of employees, deposits to assets ratio and net result have a positive effect.

  12. MICROECONOMIC FACTORS AFFECTING BANKS’ FINANCIAL PERFORMANCE: THE CASE OF ROMANIA

    Directory of Open Access Journals (Sweden)

    Lavinia Mihaela GUŢU

    2015-04-01

    Full Text Available Banks are important cells in the economy as they have a significant role by maintaining and encouraging the development of economic sectors. They refocus the resources from those who have surplus to those which have a deficit. Therefore, as any other enterprises, performance is highly desirable for banks and, then, it is crucial to discover what the main factors that influence this objective are. So, this paper analyzes the microeconomic factors affecting bank’s financial performance focusing on 11 entities for the period between 2003 and 2013. The performance is measured by return on assets. The independent variables used are bank’s size, financial leverage,loans to assets ratio, deposits to assets ratio, number of employees, liquidity, net result and monetary policy rate. The results show that bank’s size, loans to assets ratio and liquidity have not a significant impact on performance. Financial leverage has a negative impact, meanwhile the number of employees, deposits to assets ratio and net result have a positive effect.

  13. Motivational factors and performance in soccer

    Directory of Open Access Journals (Sweden)

    Maria Cristina Chimelo Paim

    2008-06-01

    Full Text Available This study aimed to verify what were the motivational factors that made teenagers to choose ADUFSM soccer school, and to verify the difference among the groups, the performance and gain scores at soccer basis. The sample comprised 32 persons, 10 to 16 years old, that practice soccer at ADUFSM. The sample was divided in four groups. The motivational factors inventory (MFI was applied in the beginning of the semester. It was verified, through descriptive statistics, that the stronger motivation for the subjects involvement with soccer was to develop skills (78%, followed by excitation and challenge (72%; affiliation (70% and aptitude (68%. The performance level evaluation in three different phases was done through soccer basis analytical matrix (SBAM, always in game situation. Five observations per subject were made for each base listed in SBAM, and the execution mistakes were identifies. Initially, an ANOVA was used to deal with the data; later, a post-hoc test. The results showed that learning occurred and that there was a significant difference favoring GF10 in the learning gain scores after the treatment.

  14. Nominal Performance Biosphere Dose Conversion Factor Analysis

    Energy Technology Data Exchange (ETDEWEB)

    M.A. Wasiolek

    2005-04-28

    This analysis report is one of the technical reports containing documentation of the Environmental Radiation Model for Yucca Mountain, Nevada (ERMYN), a biosphere model supporting the Total System Performance Assessment (TSPA) for the license application (LA) for the Yucca Mountain repository. This analysis report describes the development of biosphere dose conversion factors (BDCFs) for the groundwater exposure scenario, and the development of conversion factors for assessing compliance with the groundwater protection standards. A graphical representation of the documentation hierarchy for the ERMYN is presented in Figure 1-1. This figure shows the interrelationships among the products (i.e., analysis and model reports) developed for biosphere modeling and provides an understanding of how this analysis report contributes to biosphere modeling. This report is one of two reports that develop BDCFs, which are input parameters for the TSPA-LA model. The ''Biosphere Model Report'' (BSC 2004 [DIRS 169460]) describes in detail the ERMYN conceptual model and mathematical model. The input parameter reports, shown to the right of the ''Biosphere Model Report'' in Figure 1-1, contain detailed description of the model input parameters, their development, and the relationship between the parameters and specific features events and processes (FEPs). This report describes biosphere model calculations and their output, the BDCFs, for the groundwater exposure scenario. This analysis receives direct input from the outputs of the ''Biosphere Model Report'' (BSC 2004 [DIRS 169460]) and the five analyses that develop parameter values for the biosphere model (BSC 2005 [DIRS 172827]; BSC 2004 [DIRS 169672]; BSC 2004 [DIRS 169673]; BSC 2004 [DIRS 169458]; BSC 2004 [DIRS 169459]). The results of this report are further analyzed in the ''Biosphere Dose Conversion Factor Importance and Sensitivity Analysis

  15. ISI's Impact Factor as Misnomer: A Proposed New Measure To Assess Journal Impact.

    Science.gov (United States)

    Harter, Stephen P.; Nisonger, Thomas E.

    1997-01-01

    Discusses "impact factor," a measure of journal impact defined by the Institute of Scientific Information (ISI) and available in Journal Citation Reports. Argues that "impact factor" is misnamed and misused, suggesting an alternative name and interpretation of the measure, and proposes two new measures to assess the impact of…

  16. Some anthropologic factors of performance in rhythmic gymnastics novices.

    Science.gov (United States)

    Miletić, Durdica; Katić, Ratko; Males, Boris

    2004-12-01

    The aim of the study was to determine motor and morphological factors, and to assess their impact on specific motor skill performance in rhythmic gymnastics (RG). Experimental training process aimed at learning and improving basic movement structures of rhythmic gymnastics was performed for nine months in a sample of 50 female rhythmic gymnastics novices (mean age 7.1 +/- 0.3 years). Seven dimensions in total were isolated by factorial analysis of 13 motor, 11 morphological, and 20 specific rhythmic gymnastics tests. The factors of flexibility (Beta = 0.26; p gymnastics novices should be programmed, with preset objectives for the development of flexibility and explosive strength, speed and peripheral joint strength and adipose tissue reduction.

  17. Nominal Performance Biosphere Dose Conversion Factor Analysis

    Energy Technology Data Exchange (ETDEWEB)

    M. Wasiolek

    2000-12-21

    The purpose of this report was to document the process leading to development of the Biosphere Dose Conversion Factors (BDCFs) for the postclosure nominal performance of the potential repository at Yucca Mountain. BDCF calculations concerned twenty-four radionuclides. This selection included sixteen radionuclides that may be significant nominal performance dose contributors during the compliance period of up to 10,000 years, five additional radionuclides of importance for up to 1 million years postclosure, and three relatively short-lived radionuclides important for the human intrusion scenario. Consideration of radionuclide buildup in soil caused by previous irrigation with contaminated groundwater was taken into account in the BDCF development. The effect of climate evolution, from the current arid conditions to a wetter and cooler climate, on the BDCF values was evaluated. The analysis included consideration of different exposure pathway's contribution to the BDCFs. Calculations of nominal performance BDCFs used the GENII-S computer code in a series of probabilistic realizations to propagate the uncertainties of input parameters into the output. BDCFs for the nominal performance, when combined with the concentrations of radionuclides in groundwater allow calculation of potential radiation doses to the receptor of interest. Calculated estimates of radionuclide concentration in groundwater result from the saturated zone modeling. The integration of the biosphere modeling results (BDCFs) with the outcomes of the other component models is accomplished in the Total System Performance Assessment (TSPA) to calculate doses to the receptor of interest from radionuclides postulated to be released to the environment from the potential repository at Yucca Mountain.

  18. Strategic Factor Markets Scale Free Resources and Economic Performance

    DEFF Research Database (Denmark)

    Geisler Asmussen, Christian

    2015-01-01

    This paper analyzes how scale free resources, which can be acquired by multiple firms simultaneously and deployed against one another in product market competition, will be priced in strategic factor markets, and what the consequences are for the acquiring firms' performance. Based on a game......-theoretic model, it shows how the impact of strategic factor markets on economic profits is influenced by product market rivalry, preexisting competitive (dis)advantages, and the interaction of acquired resources with those preexisting asymmetries. New insights include the result that resource suppliers will aim...... at (and largely succeed in) setting resource prices so that the acquiring firms earn negative strategic factor market profits—sacrificing some of their preexisting market power rents—by acquiring resources that they know to be overpriced....

  19. Factors affecting penetrating captive bolt gun performance.

    Science.gov (United States)

    Gibson, Troy J; Mason, Charles W; Spence, Jade Y; Barker, Heather; Gregory, Neville G

    2015-01-01

    Captive bolt stunning is used for rendering livestock insensible at slaughter. The mechanical factors relating to performance of 6 penetrating captive bolt gun (CBG) models were examined. The Matador Super Sécurit 3000 and the .25 Cash Euro Stunner had the highest kinetic energy values (443 J and 412 J, respectively) of the CBGs tested. Ninety percent (27/30) of CBGs held at a government gun repository (United Kingdom) were found to have performed at a normal standard for the model, while 53% (10/19) of commercial contractor CBGs tested were found to underperform for the gun model. When the .22 Cash Special was fired 500 times at 4 shots per min, the gun reached a peak temperature of 88.8°C after 2.05 hr. Repeat firing during extended periods significantly reduced the performance of the CBG. When deciding on the appropriate CBG/cartridge combination, the kinetic energy delivered to the head of the nonhuman animal, bolt penetration depth, and species/animal type must be considered. It is recommended that CBGs are routinely checked for wear to the bolt and barrel if they are repeatedly fired in a session.

  20. Impact of Health Care Employees’ Job Satisfaction On Organizational Performance Support Vector Machine Approach

    Directory of Open Access Journals (Sweden)

    Cemil Kuzey

    2012-05-01

    Full Text Available This study was undertaken to search for key factors that contribute to job satisfaction among health care workers, and also to determine the impact of these underlying dimensions of employee satisfaction on organizational performance. Exploratory Factor Analysis (EFA was applied to initially uncover the key factors, and then, in the next stage of analysis, a popular data mining technique, Support Vector Machine (SVM was employed on a sample of 249 to determine the impact of job satisfaction factors on organizational performance. According to the proposed model, the main factors were revealed to be management’s attitude, pay/reward, job security and colleagues.

  1. A Sensitivity Analysis Approach to Identify Key Environmental Performance Factors

    Directory of Open Access Journals (Sweden)

    Xi Yu

    2014-01-01

    Full Text Available Life cycle assessment (LCA is widely used in design phase to reduce the product’s environmental impacts through the whole product life cycle (PLC during the last two decades. The traditional LCA is restricted to assessing the environmental impacts of a product and the results cannot reflect the effects of changes within the life cycle. In order to improve the quality of ecodesign, it is a growing need to develop an approach which can reflect the changes between the design parameters and product’s environmental impacts. A sensitivity analysis approach based on LCA and ecodesign is proposed in this paper. The key environmental performance factors which have significant influence on the products’ environmental impacts can be identified by analyzing the relationship between environmental impacts and the design parameters. Users without much environmental knowledge can use this approach to determine which design parameter should be first considered when (redesigning a product. A printed circuit board (PCB case study is conducted; eight design parameters are chosen to be analyzed by our approach. The result shows that the carbon dioxide emission during the PCB manufacture is highly sensitive to the area of PCB panel.

  2. Nominal Performance Biosphere Dose Conversion Factor Analysis

    Energy Technology Data Exchange (ETDEWEB)

    M. Wasiolek

    2004-09-08

    This analysis report is one of the technical reports containing documentation of the Environmental Radiation Model for Yucca Mountain, Nevada (ERMYN), a biosphere model supporting the Total System Performance Assessment (TSPA) for the license application (LA) for the Yucca Mountain repository. This analysis report describes the development of biosphere dose conversion factors (BDCFs) for the groundwater exposure scenario, and the development of conversion factors for assessing compliance with the groundwater protection standard. A graphical representation of the documentation hierarchy for the ERMYN is presented in Figure 1-1. This figure shows the interrelationships among the products (i.e., analysis and model reports) developed for biosphere modeling and provides an understanding of how this analysis report contributes to biosphere modeling. This report is one of two reports that develop biosphere BDCFs, which are input parameters for the TSPA-LA model. The ''Biosphere Model Report'' (BSC 2004 [DIRS 169460]) describes in detail the ERMYN conceptual model and mathematical model. The input parameter reports, shown to the right of the ''Biosphere Model Report'' in Figure 1-1, contain detailed description of the model input parameters, their development, and the relationship between the parameters and specific features events and processes (FEPs). This report describes biosphere model calculations and their output, the BDCFs, for the groundwater exposure scenario. The objectives of this analysis are to develop BDCFs for the groundwater exposure scenario for the three climate states considered in the TSPA-LA as well as conversion factors for evaluating compliance with the groundwater protection standard. The BDCFs will be used in performance assessment for calculating all-pathway annual doses for a given concentration of radionuclides in groundwater. The conversion factors will be used for calculating gross alpha particle

  3. The impact of SARS on hospital performance

    Directory of Open Access Journals (Sweden)

    Chen Ran-Chou

    2008-11-01

    Full Text Available Abstract Background During the SARS epidemic, healthcare utilization and medical services decreased significantly. However, the long-term impact of SARS on hospital performance needs to be further discussed. Methods A municipal hospital in Taipei City was shut down for a month due to SARS and then became the designated SARS and infectious disease hospital for the city. This study collected the outpatient, inpatient and emergency service volumes for every year from April to March over four years. Average monthly service amount ± standard deviation were used to compare patient volume for the whole hospital, as well as the outpatient numbers accessing different departments. The ARIMA model of outpatient volume in the pre-SARS year was developed. Results The average monthly service volume of outpatient visits for the base year 2002 was 52317 ± 4204 visits per month, and number for 2003 and the following two years were 55%, 82% and 84% of the base year respectively. The average emergency service volume was 4382 ± 356 visits per month at the base year and this became 45%, 77% and 87% of the base year for the following three years respectively. Average inpatient service volume was 8520 ± 909 inpatient days per month at the base year becoming 43%, 81% and 87% of the base year for the following three years respectively. Only the emergency service volume had recovered to the level of a non-significant difference at the second year after SARS. In addition, the departments of family medicine, metabolism and nephrology reached the 2002 patient number in 2003. The ARIMA (2,1,0 model was the most suitable for outpatient volume in pre-SARS year. The MAPE of the ARIMA (2,1,0 model for the pre-SARS year was 6.9%, and 43.2%, 10.6%, 6.2% for following 3 years. Conclusion This study demonstrates that if a hospital is completely shut down due to SARS or a similar disease, the impact is longer than previous reported and different departments may experience

  4. Trends in impact factors of ophthalmology journals

    Directory of Open Access Journals (Sweden)

    Igor Vainer

    2016-01-01

    Full Text Available Purpose: To test whether there is an association between the growth in the number of ophthalmic journals in the past years and their mean and maximum impact factor (IF as a common sign of scientific proliferation. Methods: Using data from the 2013 Journal Citation Report database a study of the major clinical medical fields was conducted to assess the correlation between the number of journals and maximum IF in a given field in the year 2013. In the field of ophthalmology, we examined the correlation between year, number of journals, mean IF and maximum IF in the field of ophthalmology throughout the years 2000–2013. Results: In the major medical fields, a positive correlation was found between the number of journals and the maximum IF (quadratic R2 = 0.71, P< 0.001. When studying the field of ophthalmology a positive correlation between the number of journals and mean IF (R2 = 0.84, P< 0.001 and between number of journals and maximum IF (R2 = 0.71, P< 0.001 was detected. Conclusions: Our findings suggest that the variation in the IF can be explained by the number of journals in the field of ophthalmology. In the future, the formation of additional ophthalmology journals is likely to further increase the IFs of existing journals.

  5. Trends in impact factors of ophthalmology journals.

    Science.gov (United States)

    Vainer, Igor; Mimouni, Francis; Blumenthal, Eytan Z; Mimouni, Michael

    2016-09-01

    To test whether there is an association between the growth in the number of ophthalmic journals in the past years and their mean and maximum impact factor (IF) as a common sign of scientific proliferation. Using data from the 2013 Journal Citation Report database a study of the major clinical medical fields was conducted to assess the correlation between the number of journals and maximum IF in a given field in the year 2013. In the field of ophthalmology, we examined the correlation between year, number of journals, mean IF and maximum IF in the field of ophthalmology throughout the years 2000-2013. In the major medical fields, a positive correlation was found between the number of journals and the maximum IF (quadratic R2 = 0.71, Pjournals and mean IF (R2 = 0.84, Pjournals and maximum IF (R2 = 0.71, Pjournals in the field of ophthalmology. In the future, the formation of additional ophthalmology journals is likely to further increase the IFs of existing journals.

  6. Steady impact factor growth for MDPI open access journals.

    Science.gov (United States)

    Thiesen, Alexander

    2012-09-12

    For the past three years MDPI has announced the newly released impact factors for its Open Access journals by the means of an annual editorial [1-3]. In 2012 we are-once again-pleased to report that the growth of the impact factors of MDPI's Open Access journals continues. This year's edition of the Journal Citation Reports (JCR), which is published annually by Thomson Reuters, includes 10 journals published by MDPI, including three that have received their first official Impact Factors- International Journal of Environmental Research and Public Health (IJERPH), Materials Nutrients. Table 1 reports the latest Impact Factors for 2011. Figure 1 graphically depicts the evolution of the Impact Factors for four MDPI open access journals that have received Impact Factors in the past. Table 2 reports the ranking of the MDPI journals within the subject categories of the Science Citation Index Expanded.

  7. Human performance modeling for system of systems analytics: combat performance-shaping factors.

    Energy Technology Data Exchange (ETDEWEB)

    Lawton, Craig R.; Miller, Dwight Peter

    2006-01-01

    The US military has identified Human Performance Modeling (HPM) as a significant requirement and challenge of future systems modeling and analysis initiatives. To support this goal, Sandia National Laboratories (SNL) has undertaken a program of HPM as an integral augmentation to its system-of-system (SoS) analytics capabilities. The previous effort, reported in SAND2005-6569, evaluated the effects of soldier cognitive fatigue on SoS performance. The current effort began with a very broad survey of any performance-shaping factors (PSFs) that also might affect soldiers performance in combat situations. The work included consideration of three different approaches to cognition modeling and how appropriate they would be for application to SoS analytics. This bulk of this report categorizes 47 PSFs into three groups (internal, external, and task-related) and provides brief descriptions of how each affects combat performance, according to the literature. The PSFs were then assembled into a matrix with 22 representative military tasks and assigned one of four levels of estimated negative impact on task performance, based on the literature. Blank versions of the matrix were then sent to two ex-military subject-matter experts to be filled out based on their personal experiences. Data analysis was performed to identify the consensus most influential PSFs. Results indicate that combat-related injury, cognitive fatigue, inadequate training, physical fatigue, thirst, stress, poor perceptual processing, and presence of chemical agents are among the PSFs with the most negative impact on combat performance.

  8. Observer analysis and its impact on task performance modeling

    Science.gov (United States)

    Jacobs, Eddie L.; Brown, Jeremy B.

    2014-05-01

    Fire fighters use relatively low cost thermal imaging cameras to locate hot spots and fire hazards in buildings. This research describes the analyses performed to study the impact of thermal image quality on fire fighter fire hazard detection task performance. Using human perception data collected by the National Institute of Standards and Technology (NIST) for fire fighters detecting hazards in a thermal image, an observer analysis was performed to quantify the sensitivity and bias of each observer. Using this analysis, the subjects were divided into three groups representing three different levels of performance. The top-performing group was used for the remainder of the modeling. Models were developed which related image quality factors such as contrast, brightness, spatial resolution, and noise to task performance probabilities. The models were fitted to the human perception data using logistic regression, as well as probit regression. Probit regression was found to yield superior fits and showed that models with not only 2nd order parameter interactions, but also 3rd order parameter interactions performed the best.

  9. Steady Impact Factor Growth for MDPI Open Access Journals

    Directory of Open Access Journals (Sweden)

    Alexander Thiesen

    2012-09-01

    Full Text Available For the past three years MDPI has announced the newly released impact factors for its Open Access journals by the means of an annual editorial [1–3]. In 2012 we are—once again—pleased to report that the growth of the impact factors of MDPI’s Open Access journals continues. This year’s edition of the Journal Citation Reports (JCR, which is published annually by Thomson Reuters, includes 10 journals published by MDPI, including three that have received their first official Impact Factors—International Journal of Environmental Research and Public Health (IJERPH, Materials and Nutrients. Table 1 reports the latest Impact Factors for 2011. Figure 1 graphically depicts the evolution of the Impact Factors for four MDPI open access journals that have received Impact Factors in the past. Table 2 reports the ranking of the MDPI journals within the subject categories of the Science Citation Index Expanded (SCIE.

  10. The Impact of a Learning Organization on Performance: Focusing on Knowledge Performance and Financial Performance

    Science.gov (United States)

    Kim, Kyoungshin; Watkins, Karen E.; Lu, Zhenqiu

    2017-01-01

    Purpose: The purpose of this study is to examine the relationships among a learning organization, knowledge and financial performance using the Dimensions of the Learning Organization Questionnaire and its abbreviated version. Design/methodology/approach: This study used a secondary data set and performed second-order factor analysis and…

  11. The Impact of a Learning Organization on Performance: Focusing on Knowledge Performance and Financial Performance

    Science.gov (United States)

    Kim, Kyoungshin; Watkins, Karen E.; Lu, Zhenqiu

    2017-01-01

    Purpose: The purpose of this study is to examine the relationships among a learning organization, knowledge and financial performance using the Dimensions of the Learning Organization Questionnaire and its abbreviated version. Design/methodology/approach: This study used a secondary data set and performed second-order factor analysis and…

  12. 基于GAM模型研究金枪鱼围网沉降性能影响因素%Impact factors of sinking performance for tuna purse seine based on the generalized additive model

    Institute of Scientific and Technical Information of China (English)

    唐浩; 许柳雄; 周成; 朱国平; 王学昉

    2013-01-01

    Tuna purse seining is the most efficient fishing method in the modern tuna fisheries,and the this present study analyzed the sinking performance in tuna purse seines and its relationships with impact factors,which are beneficial to improve efficient fishing in tuna purse seines.Based on the data collected from the tuna purse seiner "JINHUI 7" operating in the Western and Central Pacific Ocean(WCPO) during September to December 2011,the present study analyzed the relationship between sinking depth (H)and other variables,including shooting duration(T),shooting velocity(V0),length of purse line(L),length of ran line(L1)andcurrent speed(V10,V60 and V120) of 10 m,60 m and 120 m layers,the impact factors on sinking depth are also estimated using the generalized additive model(GAM).The results show that(1) the relationship between the sinking depth (H) and time (t) for the middle section of leadline can be described by the formula H =-0.000 2 t2 +0.408 6 t + 1.809 9 (R2 =0.999 3).(2) the sinking speed decreased with the increasing depth,the relationship between the sinking speed (V) at the middle part of leadline and time (t) can be described using the formula V=2.5 × 10-7 t2-6 × 10-4 t +0.441 2(R2 =0.985 2).(3) the analysis of stepwise GAM shows that four factors have a significant impact on the sinking depth (P < 0.05) and the significance can be ordered by V120,L,T and V60;(4) the analysis of GAM shows that the sinking depth increases gradually with the increasing shooting duration,which concentrates on the period of 500-550 s;current speed has a negative correlation to the sinking depth;the length of purse line is mainly concentrated in about 1 800 m.%金枪鱼围网渔业是现代金枪鱼渔业中捕捞效率最高的方法,研究围网沉降性能与影响因子之间的关系有利于提高围网捕捞效率.利用2011年9-12月金枪鱼围网渔船“金汇7号”在中西太平洋作业时所收集的数据,实验分析了围网沉降深度(H)与

  13. Impact of Communication Protocol on Performance

    Energy Technology Data Exchange (ETDEWEB)

    Worley, P.H.

    1999-02-01

    We use the PSTSWM compact application benchmark code to characterize the performance behavior of interprocessor communication on the SGI/Cray Research Origin 2000 and T3E-900. We measure 1. single processor performance, 2. point-to-point communication performance, 3. performance variation as a function of communication protocols and transport layer for collective communication routines, and 4. performance sensitivity of full application code to choice of parallel implementation. We also compare and contrast these results with similar results for the previous generation of parallel platforms, evaluating how the relative importance of communication performance has changed.

  14. Sensitivity Analysis on the Impact Factors of the GSHP System Considering Energy Generation and Environmental Impact Using LCA

    Directory of Open Access Journals (Sweden)

    Taehoon Hong

    2016-04-01

    Full Text Available The world is facing a crisis due to energy depletion and environmental pollution. The ground source heat pump (GSHP system, the most efficient new/renewable energy (NRE system that can reduce the load of heating/cooling equipment in a building, can be used to address this crisis. Designers and contractors have implemented such systems depending on their experience, although there are many factors that affect the performance of the GSHP system. Therefore, this study aimed to conduct a sensitivity analysis on the impact factors in terms of energy generation and environmental impact. This study was conducted as follows: (i collecting the impact factors that affect the GSHP system’s performance; (ii establishing the GSHP system’s scenarios with the impact factors; (iii determining the methodology and calculation tool to be used for conducting sensitivity analysis; and (iv conducting sensitivity analysis on the impact factors of the GSHP system in terms of energy generation and environmental impact using life cycle assessment. The results of this study can be used: (i to establish the optimal design strategy for different application fields and different seasons; and (ii to conduct a feasibility study on energy generation and environmental impact at the level of the life cycle.

  15. Impact of Non-Price Factors on Purchase Intention Counterfeits

    Directory of Open Access Journals (Sweden)

    Kambiz Heidarzadeh Hanzaee

    2012-09-01

    Full Text Available This research purposes to investigation of impact of non-price factors on consumer attitude and purchase intention counterfeits luxury brand. We used a survey with 398 students of Islamic Azad university of central unit was conducted in the Iranian students although self-questionnaire that a questionnaire was developed consisting of previously used scales and also we used the Structural Equation Modeling technique to examine the hypothesized relationships. In addition, we involved AMOS software for analysis. We found that perceived risk and subjective norms factors are most influence on attitude toward counterfeits that they are only impact antecedent’s attitude on behavioral intention. This research limited to only a city (Tehran and just dedicated to students, therefore we cannot generalize to whole consumer society and we have time and money limited. This research offer in-depth understanding from consumer attitude toward counterfeits luxury brands in Iran country and help to marketers that find strategies for preventing of purchasing counterfeit luxury brands. This research performed for first in Iran, focused of demand side`s counterfeits and investigated social and personality influences on attitude toward counterfeits that they are non-price factors.

  16. Home Environmental Factors Influencing Performance and Progress ...

    African Journals Online (AJOL)

    2010-05-11

    May 11, 2010 ... on the relationship between mother tongue instruction and school performance, but the ... pupil performance (Colclough et. al, 2003; Zuze, 2010). ... master reading skills and to perform well in school (Harlech-Jones, 1998;.

  17. Factors That Impact the Ethical Behavior of College Students

    Science.gov (United States)

    Joseph, Jacob; Berry, Kevin

    2010-01-01

    This study examines factors impacting ethical behavior of 182 college students in the midwestern and northwestern United States. Ethical behavior of peers had the most significant impact on ethical behavior of students. Success (in terms of grade point average) of students, and gender of the respondents, also significantly impacted ethical…

  18. Building a List of Journals with Constructed Impact Factors.

    Science.gov (United States)

    Stegmann, Johannes

    1999-01-01

    Describes the building of a list of constructed-impact factors (CIF) for biomedical journals not included in the 1996 editions of the "Journal Citation Reports." The online retrieval from the host DIMDI of the data needed for impact-factor calculation is described. The top 100 (of 338 titles, ranked according to their CIFs) are…

  19. The pragmatics of a diachronic journal impact factor

    DEFF Research Database (Denmark)

    Ingwersen, Peter

    2012-01-01

    With reference to Vanclay (Scientometrics in press, 2012) the paper argues for a pragmatic approach to the Thomson-Reuter’s journal impact factor. The paper proposes and discusses to replace the current synchronous Thomson-Reuter journal impact factor by an up-to-date diachronic version (DJIF...

  20. [Use of the Citation Index and impact factors].

    Science.gov (United States)

    Pitterová, K

    1999-09-01

    Article deals with evaluation method of scientific works by means of Citation Indexes and Impact Factor which are produced by Institute for Scientific Information of Philadelphia. It criticises criteria of the usage of Impact factor and way of research workers evaluation.

  1. Impact factors of dermatological journals for 1991 – 2000

    Directory of Open Access Journals (Sweden)

    Jemec Gregor BE

    2001-11-01

    Full Text Available Abstract Background The impact factors of scientific journals are interesting but not unproblematic. It is speculated that the number of journals in which citations can be made correlates with the impact factors in any given speciality. Methods Using the Journal Citation Report (JCR for 1997, a bibliometric analysis was made to assess the correlation between the number of journals available in different fields of clinical medicine and the top impact factor. A detailed study was made of dermatological journals listed in the JCR 1991–2000, to assess the relevance of this general survey. Results Using the 1997 JCR definitions of speciality journals, a significant linear correlation was found between the number of journals in a given field and the top impact factor of that field (rs = 0.612, p Studying the trend for dermatological journals 1991 to 2000 a similar pattern was found. Significant correlations were also found between total number of journals and mean impact factor (rs = 0.793, p = 0.006, between the total number of journals and the top impact factor (rs = 0.759, p = 0.011 and between the mean and the top impact factor (rs = 0.827, p = 0.003. Conclusions The observations suggest that the number of journals available predict the top impact factor. For dermatology journals the top and the mean impact factor are predicted. This is in good agreement with theoretical expectations as more journals make more print-space available for more papers containing citations. It is suggested that new journals in dermatology should be encouraged, as this will most likely increase the impact factor of dermatological journals generally.

  2. Difficult factors in Management of Impacted Dental Prosthesis in Esophagus

    Directory of Open Access Journals (Sweden)

    Efiaty A. Soepardi

    2005-03-01

    Full Text Available A dental prosthesis which ingested and impacted in esophagus, is an emergency case and life threatening, so require immediate esophagoscopy intervention for removing. The objective of this study is to assess some factors can caused dtfficulties in diagnosing and treating the ingested and impacted dental prosthesis in the esophagus and their complications. This retrospective study analyzed patient’s chart whose underwent esophagoscopy for removing the impacted dental prosthesis in Dr. Cipto Mangunkusumo General Hospital, Jakarta, Indonesia during a period between January 1997 and December 2003. Neck-chest X-ray and esophagoscopy were performed in all patients to identify the existence of the dental prosthesis as a diagnostic and treatment procedure. The length of time for removing the dental prosthesis was recorded and stated as a less difficult esophagoscopy when it takes time less than 60 minutes and as a difficult  esophagoscopy takes 60 minutes or longer. Some risk difficulties factors were statistically analyzed. There were 53 patients of ingested dental prosthesis in esophagus. Only 51 cases were analyzed According to the length of time for removing the dental prosthesis by esophagoscopy, 22 patients were recorded as less difficult cases and 29 patients as difficult cases. Two cases among the cases needed cervicotomy after unsuccessful esophagoscopy removal. The difficulties to diagnose an impacted dental prosthesis in the esophagus caused by unreliable clinical history, unclear signs and symptoms, unable to be detected by X-ray and was not found during esophagoscopy. The difficulties in treating due to mucosal laceration, edema, bleeding, failure of the first extraction and conformity with the size and shape, the wire outside the dental prosthesis and the length of time stayed in the esophagus. (Med J Indones 2005; 14: 33-6Keywords: ingested dental prosthesis, radioluscent foreign body, length of time of esophagoscopy

  3. The Impacts of Macroergonomics on Environmental Protection and Human Performance in Power Plants

    Directory of Open Access Journals (Sweden)

    A Azadeh, J Nouri, I Mohammad Fam

    2005-01-01

    Full Text Available Human and his performance is a vital factor in protection of asset including environmental properties. The objective of this study was to evaluate the impact of total system design factors (TSD on human performance in a power plant. The TSD factors are defined as design factors, which have impact on overall performance of the power plants in context of total human engineering or macroergonomics. The systems being studied are the control rooms and maintenance departments of a 2000 MW thermal power plant. To achieve the above objective, the TSD factors were addressed and assessed through a detailed questionnaire. The relationships between TSD factors and human performance were then examined through non-parametric correlation analysis (Kramer’s Phi and Kruskal-Wallis test of means. The results of this study show that the macroergonomic factors such as organizational and safety procedures, teamwork, self-organization, job design and information exchange, influence human performance in the power plant. The findings also suggest that the selected macroergonomic factors are correlated to human performance and must be considered, designed and tested concurrently with the engineering factors at the design phase of the system developmental cycle. Consequently, total system’s faults and organizational errors are reduced to an acceptable level and human performance is significantly increased. The main goal in such program is customer's satisfaction (Internal customers. However, more elaboration on the scientific tools for implementation of TDS factors in context of human performance is also under investigation.

  4. The Impact of Social Networks on Students’ Performance

    OpenAIRE

    Jusuf Zekiri

    2016-01-01

    The objective of this study is to determine the impact of using social media and its impact on students’ performance and success. This research tries to identify the relationship between students’ use of social networks and their success in their studies. It tries also to find out whether time spent impacts students’ performance and success. Whether students use social media more for entertainment or for teaching and information sharing purposes. The paper uses a quantitative approach for col...

  5. Research on the Relationships between Chinese Journal Impact Factors and External Web Link Counts and Web Impact Factors

    Science.gov (United States)

    An, Lu; Qiu, Junping

    2004-01-01

    Journal impact factors (JIFs) as determined by the Institute for Scientific and Technological Information of China (ISTIC) of forty-two Chinese engineering journals were compared with external Web link counts, obtained from Lycos, and Web Impact Factors (WIFs) of corresponding journal Web sites to determine if any significant correlation existed…

  6. Impact of human resource management practices on nursing home performance.

    Science.gov (United States)

    Rondeau, K V; Wagar, T H

    2001-08-01

    Management scholars and practitioners alike have become increasingly interested in learning more about the ability of certain 'progressive' or 'high-performance' human resource management (HRM) practices to enhance organizational effectiveness. There is growing evidence to suggest that the contribution of various HRM practices to impact firm performance may be synergistic in effect yet contingent on a number of contextual factors, including workplace climate. A contingency theory perspective suggests that in order to be effective, HMR policies and practices must be consistent with other aspects of the organization, including its environment. This paper reports on empirical findings from research that examines the relationship between HRM practices, workplace climate and perceptions of organizational performance, in a large sample of Canadian nursing homes. Data from 283 nursing homes were collected by means of a mail survey that included questions on HRM practices, programmes, and policies, on human resource aspects of workplace climate, as well as a variety of indicators that include employee, customer/resident and facility measures of organizational performance. Results derived from ordered probit analysis suggest that nursing homes in our sample which had implemented more 'progressive' HRM practices and which reported a workplace climate that strongly values employee participation, empowerment and accountability tended to be perceived to generally perform better on a number of valued organizational outcomes. Nursing homes in our sample that performed best overall were found to be more likely to not only have implemented more of these HRM practices, but also to report having a workplace climate that reflects the seminal value that it places on its human resources. This finding is consistent with the conclusion that simply introducing HRM practices or programmes, in the absence of an appropriately supportive workplace climate, will be insufficient to attain

  7. Chinese life cycle impact assessment factors

    DEFF Research Database (Denmark)

    Yang, Jianxin; Nielsen, Per Henning

    2001-01-01

    was determined as the normalization reference (ER ( j)90) divided by society's target contribution in the year 2000 abased on Chinese political reduction plans, ER ( j)(T2000). This paper presents and discuss results obtained for eight different environmental impact categories relevant for China: global warming...

  8. Knowledge Factors and Their Impact on the Organisation

    Directory of Open Access Journals (Sweden)

    Domen Kozjek

    2016-12-01

    Full Text Available Research Question (RQ: The research question is whether managers in organisations recognize the benefits of knowledge management. Purpose: The purpose of this research is to identify the factors of knowledge which have a significant impact on the organisation. Method: We reviewed the relevant literature in the field of knowledge management. On this basis, we summarized the factors of knowledge. We performed a survey among the 69 biggest Slovenian commercial companies (public and banking sectors were excluded. Results: Research has shown that managers recognize the positive effects of knowledge. Factor analysis, with the discovery of latent variables, additionally confirmed already established facts from the research literature. This led us to the discovery that knowledge is the common denominator of all companies, regardless of the business in which they operate. Organisation: From the examined literature, we can conclude that knowledge management has a positive impact on the company's results. Identification of knowledge factors allows a more efficient use of company’s resources and enables further development of the organisation. Society: Knowledge has become a highly appreciated "resource", therefore it is necessary to be able to manage it. Knowledge is the foundation of progress, not only for the development of the company but for the entire civilization. Originality: We see the original contribution in the identification of dilemmas in building connections between knowledge management and the company's success. Limitations / further research: The research matter is extremely difficult because the evidence that knowledge is the most influencing matter of a company’s success can not be easily confirmed. The connection (we remain inside the topic of human capital between knowledge and company's result is also manifested with other elements of the business, such as organisational culture, public relations, etc. Additional question is

  9. Examining the factor structure of the Multiple Sclerosis Impact Scale.

    Science.gov (United States)

    Fitzgerald, Shawn M; Li, Jian; Rumrill, Phillip D; Merchant, William; Bishop, Malachy

    2014-01-01

    The purpose of this study was to investigate the factor structure of the Multiple Sclerosis Impact Scale (MSIS-29) to assess its suitability for modeling the impact of MS on a nation-wide sample of individuals from the United States. Investigators completed a Confirmatory Factor Analysis (CFA) to examine the two-factor structure proposed by Hobart et al. [17]. Although the original MSIS-29 factor structure did not fit the data exactly, the hypothesized two-factor model was partially supported in the current data. Implications for future instrument development and rehabilitation practice are discussed.

  10. The meaning of the Impact Factor

    Directory of Open Access Journals (Sweden)

    Eugene Garfield

    2003-01-01

    Full Text Available El factor de impacto y otros índices bibliométricos son utilizados en la actualidad, en la mayoría de los países, para evaluar la investigación científica: proyectos de investigación, revistas, artículos, investigadores e instituciones. En el presente artículo se responden a las preguntas mas frecuentes sobre qué es el factor de impacto y cómo debe ser utilizado. En concreto, se habla de su origen, de los criterios que debe cumplir una revista, del factor de impacto como criterio de evaluación, de la relación entre la calidad de las revistas y el factor de impacto, de la evaluación de la calidad de las publicaciones, del período de evaluación para el cálculo del índice de impacto, del calculo del índice de impacto, de la comparación entre revistas de diferentes campos científicos, de la generalización del factor de impacto de una revista a cada uno de los artículos publicados en ella, de la relación entre el factor de impacto y la dificultad de publicar, del idioma en que publican las revistas y de cómo mejorar el factor de impacto de una revista.

  11. [The invalidity of the impact factor as indicator of the impact of Latin American scientific journals].

    Science.gov (United States)

    Monge-Nájera, Julián

    2014-03-01

    Use of the Impact Factor is currently being discarded in industrialized countries where, to name one case, up to 40% of the articles published in Nature are never cited, despite the high Impact Factor of that journal. However, it is still used in Latin America to evaluate journals and authors, potentially influencing who are given positions and who receives funding. To find out how valid the Impact Factor is for Latin American research, 1 used the database BINABITROP to see how much of the relevant literature was used to measure impact. I found that the Science Citation Index (SCI) excluded 96% of the relevant literature when measuring the impact of biological articles about Costa Rica for the studied year (2011). Therefore, the impact of Latin American science is unknown and the Impact Factor should not be used to assess how often a journal, institution or author are cited.

  12. Impact of Life Factors upon Attitudes toward Death.

    Science.gov (United States)

    Franke, Kevin J.; Durlak, Joseph A.

    1990-01-01

    Investigated impact of life factors on college students' (N=47) feelings about death. Most important life factors clustered into three categories: Death of Significant Other, Religious Upbringing, and Near-Death Experiences. Although factors had mixed effects across individuals, they were significant predictors of current feelings about death.…

  13. High-Performance, Low Environmental Impact Refrigerants

    Science.gov (United States)

    McCullough, E. T.; Dhooge, P. M.; Glass, S. M.; Nimitz, J. S.

    2001-01-01

    Refrigerants used in process and facilities systems in the US include R-12, R-22, R-123, R-134a, R-404A, R-410A, R-500, and R-502. All but R-134a, R-404A, and R-410A contain ozone-depleting substances that will be phased out under the Montreal Protocol. Some of the substitutes do not perform as well as the refrigerants they are replacing, require new equipment, and have relatively high global warming potentials (GWPs). New refrigerants are needed that addresses environmental, safety, and performance issues simultaneously. In efforts sponsored by Ikon Corporation, NASA Kennedy Space Center (KSC), and the US Environmental Protection Agency (EPA), ETEC has developed and tested a new class of refrigerants, the Ikon (registered) refrigerants, based on iodofluorocarbons (IFCs). These refrigerants are nonflammable, have essentially zero ozone-depletion potential (ODP), low GWP, high performance (energy efficiency and capacity), and can be dropped into much existing equipment.

  14. High Performance Networks for High Impact Science

    Energy Technology Data Exchange (ETDEWEB)

    Scott, Mary A.; Bair, Raymond A.

    2003-02-13

    This workshop was the first major activity in developing a strategic plan for high-performance networking in the Office of Science. Held August 13 through 15, 2002, it brought together a selection of end users, especially representing the emerging, high-visibility initiatives, and network visionaries to identify opportunities and begin defining the path forward.

  15. Conversion during thoracoscopic lobectomy: related factors and learning curve impact.

    Science.gov (United States)

    Smith, David E; Dietrich, Agustin; Nicolas, Matias; Da Lozzo, Alejandro; Beveraggi, Enrique

    2015-12-01

    Video-assisted thoracoscopic surgery (VATS) lobectomy has become a standard procedure for lung cancer treatment. Conversion-related factors and learning curve impacts, were poorly described. The aim of this study was to review the reasons and related factor for conversion in VATS lobectomy and the impact on this of the surgeon's learning curve. From June 2009 to May 2014, 154 patients who underwent a VATS lobectomy were included in our study. Patients' characteristics, pathology background, operative times, overall length of stay, overall morbidity and type of major complications were recorded for all patients and compared between non converted (n = 133) and converted (n = 21) patients. To evaluate surgeon's learning curve, we analyzed rates and causes of conversion in the first period (first 77 patients) and in the last period (78-154 patients). Patients characteristics were similar between converted and non-converted groups. Patients who were converted to open thoracotomy presented more frecuently tumors >3 cms (P = 0.02). The average of operative times and the length of stay were not significantly different between groups. Overall morbidity and major complications were also similar in both groups. There were no impact of surgeon's learning curve in overall rate conversion in both groups. Emergency conversion was always secondary to vascular accidents, all in the first group (p = 0.059). Surgeons should be expecting to perform a conversion to a thoracotomy in patients who present in preoperative studies, tumors greater than 3 cms. Learning curve only affected the emergency conversion, occurred all in the first half of our series.

  16. Mobility Impact on Performance of Mobile Grids

    CERN Document Server

    Nandeppanavar, A S; Manvi, S S; Shridhar,

    2010-01-01

    Wireless mobile grids are one of the emerging grid types, which help to pool the resources of several willing and cooperative mobile devices to resolve a computationally intensive task. The mobile grids exhibit stronger challenges like mobility management of devices, providing transparent access to grid resources, task management and handling of limited resources so that resources are shared efficiently. Task execution on these devices should not be affected by their mobility. The proposed work presents performance evaluation of wireless mobile grid using normal walk mobility model. The normal walk model represents daily motion of users and the direction of motion is mostly symmetric in a real life environment, thus it is effective in location updating of a mobile station and in turn helps task distribution among these available mobile stations. Some of the performance parameters such as Task Execution Time, task failure rate, communication overhead on Brokering Server and Monitoring Cost are discussed.

  17. Identification of Factors Affecting Educational Performance of ...

    African Journals Online (AJOL)

    The study identified the variables that tend to affect educational performance among ... The population for the study consisted of students of Lagos State University, ... These were: Circumstances, Parental Authority, Socio- Economic Label, Self ...

  18. Inflated impact factors? The true impact of evolutionary papers in non-evolutionary journals.

    Directory of Open Access Journals (Sweden)

    Erik Postma

    Full Text Available Amongst the numerous problems associated with the use of impact factors as a measure of quality are the systematic differences in impact factors that exist among scientific fields. While in theory this can be circumvented by limiting comparisons to journals within the same field, for a diverse and multidisciplinary field like evolutionary biology, in which the majority of papers are published in journals that publish both evolutionary and non-evolutionary papers, this is impossible. However, a journal's overall impact factor may well be a poor predictor for the impact of its evolutionary papers. The extremely high impact factors of some multidisciplinary journals, for example, are by many believed to be driven mostly by publications from other fields. Despite plenty of speculation, however, we know as yet very little about the true impact of evolutionary papers in journals not specifically classified as evolutionary. Here I present, for a wide range of journals, an analysis of the number of evolutionary papers they publish and their average impact. I show that there are large differences in impact among evolutionary and non-evolutionary papers within journals; while the impact of evolutionary papers published in multidisciplinary journals is substantially overestimated by their overall impact factor, the impact of evolutionary papers in many of the more specialized, non-evolutionary journals is significantly underestimated. This suggests that, for evolutionary biologists, publishing in high-impact multidisciplinary journals should not receive as much weight as it does now, while evolutionary papers in more narrowly defined journals are currently undervalued. Importantly, however, their ranking remains largely unaffected. While journal impact factors may thus indeed provide a meaningful qualitative measure of impact, a fair quantitative comparison requires a more sophisticated journal classification system, together with multiple field

  19. The Impact of ICT Use on New Millennium Learners' Educational Performance

    Science.gov (United States)

    Kang, Myunghee; Heo, Heeok; Kim, Minjeong

    2011-01-01

    Purpose: The purpose of this study is to investigate the impact of information and communication technology (ICT) use on the educational performance of new millennium learners (NMLs). Even though many factors might influence individual performance besides ICT use itself, the research focus was on the relationship between the behavioral patterns of…

  20. impact of physicochemical factors on zooplankton species richness ...

    African Journals Online (AJOL)

    DR. AMINU

    A study on the impact of physicochemical factors on zooplankton species richness and abundance was carried out .... into the water until the screen showed a fixed reading as described .... Transparency enables the sun rays to penetrate to a.

  1. Factors impacting on the adoption of biometric technology by South ...

    African Journals Online (AJOL)

    Southern African Business Review Volume 15 Number 1 2011. Factors impacting ... By definition, biometric .... data. The survey was limited to four large banks in South Africa: ..... Analyzing Quantitative Data: From Description to Explanation.

  2. Factors impacting on the nutritional status of population aged 45 ...

    African Journals Online (AJOL)

    Factors impacting on the nutritional status of population aged 45 years and ... Information on selected demographic and socio-economic household ... and obesity are problems facing this population group aged 45 years and above in Nairobi.

  3. Qualitative evaluation of selected social factors that impact sexual ...

    African Journals Online (AJOL)

    2016-08-17

    Aug 17, 2016 ... factors that impact sexual risk-taking behaviour among African students in Kwazulu-. Natal, South ...... to attract different genders and sexual orientation. Moreover, .... Journal of Psychology in Africa, 15(1), 17–24. Peltzer, K.

  4. The impact of climate change and anthropogenic factors on ...

    African Journals Online (AJOL)

    The impact of climate change and anthropogenic factors on desertification in the ... Currently, approximately 22.6% of the country's landmass is being affected by ... production, ecological degradation and emigration of people and animals.

  5. Journal impact factor: this editorial, academic and scientific influence.

    Science.gov (United States)

    Ruiz, Milton Artur; Greco, Oswaldo Tadeu; Braile, Domingo Marcolino

    2009-01-01

    In this report the authors present information on the bibliometric instruments and their importance in measuring the quality of scientific journals and researchers. They in particular the history and deployment of the impact factor of the existing Institute for Scientific Information since 1955. Are presented and discussed the criticism regarding the inadequacy of the impact factor for evaluation of scientific production, misuse and strategies editorial handling of the bibliometric index. It is presented to the new classification CAPES for the journals, based on various criteria and the impact factor and its influence on national scientific and academic life. The authors conclude that, despite all obstacles and discussions, the impact factor of the Institute for Scientific Information is still an useful tool and the only isolation available to assess the scientific and intellectual productivity.

  6. [Impact factor of Revista Iberoamericana de Micología].

    Science.gov (United States)

    Aleixandre Benavent, Rafael; Valderrama Zurián, Juan Carlos; Miguel-Dasit, Alberto; de Granda Orive, José Ignacio

    2004-12-01

    The impact factor is a bibliometric indicator published annually in the Journal Citation Reports, and widely regarded as a quality ranking of the journals included in this database. The problem with this indicator is that the impact factor of several journals not listed in the Science Citation Index database is largely unknown. The aim of this study was to analyze the 2001 national and international impact factor of Revista Iberoamericana de Micología. The National impact factor of Revista Iberoamericana de Micología was obtained by adding the number of cites in 2001 from a total of 87 Spanish medical journals of greater scientific quality. Also, bibliographical references from Spanish journals indexed in the 2001 Journal Citation reports database have been included to determine the international impact factor of this analyzed journal. Revista Iberoamericana de Micología received a total of 62 cites from published articles in 1999 to 2001, coming from 20 different journals, being their self-citation index 10.1%. The journal with the highest number of cites to Revista Iberoamericana de Micología was Journal of Clinical Microbiology, with 12 cites (19.3%). According to this findings the national and international impact factor of Revista Iberoamericana de Micología was 0.266 and 0.606, respectively. The impact factor of Revista Iberoamericana de Micología, although not included in the Science Citation Index database, was higher than other Journal Citation Reports. Moreover, Revista Iberoamericana de Micología received most of its citations from high impact factor journals included in the Journal Citation Reports database. These data support the international recognition of the scientific level of the journal.

  7. Full Open Access Journals Have Increased Impact Factors

    Directory of Open Access Journals (Sweden)

    Shu-Kun Lin

    2009-06-01

    Full Text Available We are pleased to report the increase of the impact factors of MDPI journals during 2007 and 2008. In 2005 and part of 2006, the use of a two tier publication system, whereby we offered full Open Access publication to those authors willing to contribute financially to support this option, while providing the alternative choice of free publication without Open Access for those authors who preferred not to pay, resulted in the obviously decreased impact factors seen in 2006 [...

  8. Causes for the persistence of impact factor mania.

    Science.gov (United States)

    Casadevall, Arturo; Fang, Ferric C

    2014-03-18

    ABSTRACT Numerous essays have addressed the misuse of the journal impact factor for judging the value of science, but the practice continues, primarily as a result of the actions of scientists themselves. This seemingly irrational behavior is referred to as "impact factor mania." Although the literature on the impact factor is extensive, little has been written on the underlying causes of impact factor mania. In this perspective, we consider the reasons for the persistence of impact factor mania and its pernicious effects on science. We conclude that impact factor mania persists because it confers significant benefits to individual scientists and journals. Impact factor mania is a variation of the economic theory known as the "tragedy of the commons," in which scientists act rationally in their own self-interests despite the detrimental consequences of their actions on the overall scientific enterprise. Various measures to reduce the influence of the impact factor are considered. IMPORTANCE Science and scientists are currently afflicted by an epidemic of mania manifested by associating the value of research with the journal where the work is published rather than the content of the work itself. The mania is causing profound distortions in the way science is done that are deleterious to the overall scientific enterprise. In this essay, we consider the forces responsible for the persistence of the mania and conclude that it is maintained because it disproportionately benefits elements of the scientific enterprise, including certain well-established scientists, journals, and administrative interests. Our essay suggests steps that can be taken to deal with this debilitating and destructive epidemic.

  9. [The impact factor and those who dislike it].

    Science.gov (United States)

    Schubert, András

    2015-06-28

    Since its introduction in 1976, the impact factor is permanently a subject of both criticism and glorification. This paper gives an overview on what actually the reservations and objections attack. A closer look often reveals that the criticisms are not against the specific substantial features of the impact factor. They may formulate much more general doubts or, on the other hand, superficial technical details, easily remediable flaws or inconsistensies resulting erroneous use.

  10. The Status of Cognitive Psychology Journals: An Impact Factor Approach

    Science.gov (United States)

    Togia, Aspasia

    2013-01-01

    The purpose of this study was to examine the impact factor of cognitive psychology journals indexed in the Science and Social Sciences edition of "Journal Citation Reports" ("JCR") database over a period of 10 consecutive years. Cognitive psychology journals were indexed in 11 different subject categories of the database. Their mean impact factor…

  11. The Status of Cognitive Psychology Journals: An Impact Factor Approach

    Science.gov (United States)

    Togia, Aspasia

    2013-01-01

    The purpose of this study was to examine the impact factor of cognitive psychology journals indexed in the Science and Social Sciences edition of "Journal Citation Reports" ("JCR") database over a period of 10 consecutive years. Cognitive psychology journals were indexed in 11 different subject categories of the database. Their mean impact factor…

  12. The relative importance of performance factors in Korean archery.

    Science.gov (United States)

    Kim, Han-Byul; Kim, Sae-Hyung; So, Wi-Young

    2015-05-01

    This study explored the factors affecting archery performance by calculating their relative importance in Korean archery. This study used the Delphi technique and the analytic hierarchy process (AHP). After reviewing the literature and collecting data on performance factors in archery, the importance of factors affecting archery performance was calculated by holding meetings with experts (20 archery experts) and conducting confirmatory factor analysis (463 archers) and the AHP (36 archery experts). Performance factors were divided into mental, skill, and fitness categories. Fitness factors affecting performance included "drawing a bow without an arrow," "lower-body weight training," and "upper-body weight training." Skill factors affecting performance included "extending by maintaining left and right shoulder balance during aiming," "shooting skill over a regular clicker time," "maintaining pace and direction at release," and "drawing skill by maintaining left and right shoulder balance." Mental factors affecting performance were "confidence," "concentration," "emotion control," and "positive thinking." "Confidence" was identified as the most important factor among the 11 subfactors. The performance factors identified in this study and their relative importance in determining successful performance can be used in training for optimal archery performance worldwide.

  13. Post-impact performance of composites; Predicting Compression after Impact (CAI) in composite laminates

    NARCIS (Netherlands)

    Esrall, F.

    2013-01-01

    Impact damage has been known to seriously limit the performance of composite aircraft structures. In the preliminary design phase, tens of thousands of subparts need to be analyzed for impact. Over the years, many approaches have been proposed to study the creation of impact damage and to determine

  14. Corporate Social Performance: From Output Measurement to Impact Measurement

    NARCIS (Netherlands)

    K.E.H. Maas (Karen)

    2009-01-01

    textabstractAll organisations have social, environmental and economic impacts that effect people, their communities and the natural environment. Impacts include intended as well as unintended effects and negative as well as positive effects. Current practice in performance measurement tends to focus

  15. The Impact of Mobile Learning on ESP Learners' Performance

    Science.gov (United States)

    Alkhezzi, Fahad; Al-Dousari, Wadha

    2016-01-01

    This study explores the impact of using mobile phone applications, namely Telegram Messenger, on teaching and learning English in an ESP context. The main objective is to test whether using mobile phone applications have an impact on ESP learners' performance by mainly investigating the influence such teaching technique can have on learning…

  16. Corporate Social Performance: From Output Measurement to Impact Measurement

    NARCIS (Netherlands)

    K.E.H. Maas (Karen)

    2009-01-01

    textabstractAll organisations have social, environmental and economic impacts that effect people, their communities and the natural environment. Impacts include intended as well as unintended effects and negative as well as positive effects. Current practice in performance measurement tends to focus

  17. Impact of solution gas on SAGD performance

    Energy Technology Data Exchange (ETDEWEB)

    Das, Swapan K. [Marathon Oil Corporation (United States)

    2011-07-01

    In the Athabasca region of Canada, steam assisted gravity drainage (SAGD) is used as a means to enhance oil recovery in the highly viscous oil reservoirs. During steam injection, the solution gas evolves from oil phase as a non-condensable gas. Researchers assessed through simulations that non-condensable gas has a significant negative effect on SAGD performance although field operations might show a less severe effect. This research aimed at finding the reason for the difference between simulation and field results. Simulations were conducted in homogeneous and heterogeneous models with properties from a typical Athabasca reservoir. Results showed that the solubility of gas in the liquids has to be correctly taken into account, otherwise simulation models will overestimate the gas accumulation. This paper looked into the behavior of methane gas in simulation and field operations and highlighted the reasons for the discrepancies between their results.

  18. Impact of E-Learning Strategy on Students' Academic Performance ...

    African Journals Online (AJOL)

    Impact of E-Learning Strategy on Students' Academic Performance at Strathmore University, Kenya. ... Makerere Journal of Higher Education. Journal Home · ABOUT ... of e-learning. Keywords: Teaching and Learning; E-learning; ICT.

  19. The impact of knowledge management on MNC subsidiary performance

    DEFF Research Database (Denmark)

    Mahnke, Volker; Pedersen, Torben; Venzin, Markus

    2003-01-01

    Empirical studies on the impact of knowledge management on the performance of MNCsubsidiaries remain elusive to date. This study examines the effect of knowledgemanagement tools such as corporate university, communities of practice, groupbenchmarking, learning systems and rewards upon absorptive...

  20. Impact of Onne Free Zone on Supply Chain Performance of ...

    African Journals Online (AJOL)

    Impact of Onne Free Zone on Supply Chain Performance of Registered Oil and Gas ... operational challenges and add to the cost of doing business in the zone. ... of experienced supply chain, logistics or operations managers of sampled oil ...

  1. External factors influencing the environmental performance of South African firms

    CSIR Research Space (South Africa)

    Peart, R

    2001-01-01

    Full Text Available This article reviews the external factors that influence environmental performance of companies in South Africa, drawing on international and local literature. After considering factors within the natural, social, economic and institutional...

  2. Human factors quantification via boundary identification of flight performance margin

    Directory of Open Access Journals (Sweden)

    Yang Changpeng

    2014-08-01

    Full Text Available A systematic methodology including a computational pilot model and a pattern recognition method is presented to identify the boundary of the flight performance margin for quantifying the human factors. The pilot model is proposed to correlate a set of quantitative human factors which represent the attributes and characteristics of a group of pilots. Three information processing components which are influenced by human factors are modeled: information perception, decision making, and action execution. By treating the human factors as stochastic variables that follow appropriate probability density functions, the effects of human factors on flight performance can be investigated through Monte Carlo (MC simulation. Kernel density estimation algorithm is selected to find and rank the influential human factors. Subsequently, human factors are quantified through identifying the boundary of the flight performance margin by the k-nearest neighbor (k-NN classifier. Simulation-based analysis shows that flight performance can be dramatically improved with the quantitative human factors.

  3. Factors affecting bismuth vanadate photoelectrochemical performance

    OpenAIRE

    Sinclair, Timothy S.; Hunter, Bryan M.; Winkler, Jay R.; Gray, Harry B.; Müller, Astrid M.

    2015-01-01

    Bismuth vanadate is a promising photoanode material, but recent reports on undoped BiVO_4 without sublayers and co-catalysts showed large variations in photocurrent generation. We addressed this issue by correlating photoelectrochemical performance with physical properties. We devised a novel anodic electrodeposition procedure with iodide added to the aqueous plating bath, which allowed us to prepare BiVO_4 photoanodes with virtually identical thicknesses but different morphologies, and we co...

  4. Laser dazzling impacts on car driver performance

    Science.gov (United States)

    Steinvall, Ove; Sandberg, Stig; Hörberg, Ulf; Persson, Rolf; Berglund, Folke; Karslsson, Kjell; Öhgren, Johan; Yu, Zhaohua; Söderberg, Per

    2013-10-01

    A growing problem for the Police and Security Forces has been to prevent potentially hostile individuals to pass a checkpoint, without using lethatl violence. Therefore the question has been if there is a laser or any other strong light source that could be used as a warning and dazzling device, without lethal or long term effects. To investigate the possibilities a field trial has been performed at a motor-racing track. A green CW laser with an irradiance on the eye of maximum 0.5 MPE, as defined by ICNIRP [1] and the ANZI standard [2], was used as a dazzle source. Ten drivers have been driving with dipped headlights through a course of three lines with orange cones. In every line there has been only one gate wide enough to pass without hitting the cones. The time through the course, the choice of gates and the number of cones hit have been measured. For every second trial drive through the track, the driver was exposed to the laser dazzler. The background illuminances ranged from a thousand lux in daylight to about ten millilux in darkness. The protective effect of the sun-visor of the car was investigated. The drives visual system was carefully examined before and after experimental driving and a few weeks after the experimental driving to verify that no pathological effects, that could potentially be induced by the laser exposure, pre-existed or occurred after the laser exposure. An analysis of variance for a within subjects design has been used for evaluation. It was found that green laser light can have an obvious warning effect in daylight. Dazzling does reduce the drivers ability to make judgments and manouver the car in twilight and darkness. A sun-visor can reduce the glare and give the driver an improved control, but that perception can be unjustified. No damage to the visual system was observed.

  5. RISK FACTORS INFLUENCING CONSTRUCTION PROCUREMENT PERFORMANCE IN NIGERIA

    OpenAIRE

    Dahiru, A; Aminu, Muhammad Bashir

    2016-01-01

    One of the challenges facing construction procurement performance is the failure to determine the risk related factors limiting its success. These risk factors can cause a significant increase in the procurement cost leading to an increase in the overall project cost. The purpose of this study is to identify and evaluate the risk factors influencing construction procurement performance with a view to achieve the overall project performance. The objectives are to establish a relative significa...

  6. The Impact of Organisational Learning on Organisational Performance

    Directory of Open Access Journals (Sweden)

    Anna Zgrzywa-Ziemak

    2015-12-01

    Full Text Available Purpose: The aim of this article is to analyse the theoretical views and results of empirical research concerning the relation between organisational learning (OL and organisational performance (OP. Methodology: The study was carried out through extensive literature research, including relevant literature review from databases such as ProQuest, Elsevier, Emerald and EBSCO (the phrases: “organisational learning”, “learning organisation” and “organisational performance” were searched in the keywords, titles or abstracts. Findings: From a theoretical point of view, the relation between OL and OP is neither obvious nor clear, but the analysis of the empirical studies allows one to assume that OL has an essential impact on OP. However, differences in the strength of the relation were shown and some contradictions related to the presence of the relation between OL and selected (mostly financial performance aspects identified. Furthermore, the article discusses the significant differences and inconsistencies in the methods of measuring OL, measuring OP, selecting contextual factors and adopted methods of data analysis. Implications: Inconsistencies and gaps found in the studies of the relationship between OL and OP made it possible to designate the direction for promising further research. Value: The article presents valuable insight through its in-depth, critical analysis of the organisational learning and organisational outcomes. First and foremost, this indicates that the formula of the previous empirical studies does not allow for the development of precise solutions pertaining to organisational learning management for the benefit of OP improvement.

  7. Virtual photon impact factors with exact gluon kinematic

    CERN Document Server

    Bialas, A; Peschanski, R

    2001-01-01

    An explicit analytic formula for the transverse and longitudinal impact factors S_{T,L}(N,\\gamma) of the photon using k_T factorization with exact gluon kinematics is given. Applications to the QCD dipole model and the extraction of the unintegrated gluon structure function from data are proposed.

  8. Norming of Student Evaluations of Instruction: Impact of Noninstructional Factors

    Science.gov (United States)

    Nargundkar, Satish; Shrikhande, Milind

    2014-01-01

    Student Evaluations of Instruction (SEIs) from about 6,000 sections over 4 years representing over 100,000 students at the college of business at a large public university are analyzed, to study the impact of noninstructional factors on student ratings. Administrative factors like semester, time of day, location, and instructor attributes like…

  9. Norming of Student Evaluations of Instruction: Impact of Noninstructional Factors

    Science.gov (United States)

    Nargundkar, Satish; Shrikhande, Milind

    2014-01-01

    Student Evaluations of Instruction (SEIs) from about 6,000 sections over 4 years representing over 100,000 students at the college of business at a large public university are analyzed, to study the impact of noninstructional factors on student ratings. Administrative factors like semester, time of day, location, and instructor attributes like…

  10. Impact factors: Scientific and career assessment by numbers

    NARCIS (Netherlands)

    N. Bruining (Nico); P.A. Cummins (Paul); P.W.J.C. Serruys (Patrick)

    2011-01-01

    textabstractThe most used scientific evaluation parameters today are: 1) The impact factor (IF) of scientific journals in which the papers of researchers, and their collaborators, are published and 2) The so-called H-factor which is used to evaluate the work of individual scientists. We explore in d

  11. Psychological factors in developing high performance athletes

    DEFF Research Database (Denmark)

    Elbe, Anne-Marie; Wikman, Johan Michael

    2017-01-01

    Top-level athletes are often said to have extraordinary personalities and special psychological characteristics (Gould, Dieffenbach & Moffett, 2002). This is not surprising when considering the many years of training needed to achieve athletic success. This long-term engagement in intense training...... clear with regard to the psychological skills that are needed. Therefore, the main questions to be addressed in this chapter are: (1) which psychological skills are needed to reach top performance? And (2) (how) can these skills be developed in young talents?...

  12. Performance based design of reinforced concrete beams under impact

    Directory of Open Access Journals (Sweden)

    S. Tachibana

    2010-06-01

    Full Text Available The purpose of this research is to collect fundamental data and to establish a performance-based design method for reinforced concrete beams under perpendicular impact load.

    Series of low speed impact experiments using reinforced concrete beams were performed varying span length, cross section and main reinforcement.

    The experimental results are evaluated focusing on the impact load characteristics and the impact behaviours of reinforced concrete beams. Various characteristic values and their relationships are investigated such as the collision energy, the impact force duration, the energy absorbed by the beams and the beam response values. Also the bending performance of the reinforced concrete beams against perpendicular impact is evaluated.

    An equation is proposed to estimate the maximum displacement of the beam based on the collision energy and the static ultimate bending strength. The validity of the proposed equation is confirmed by comparison with experimental results obtained by other researchers as well as numerical results obtained by FEM simulations. The proposed equation allows for a performance based design of the structure accounting for the actual deformation due to the expected impact action.

  13. Fatigue Performance of Composite Laminates After Low-velocity Impact

    Directory of Open Access Journals (Sweden)

    LIANG Xiao-lin

    2016-12-01

    Full Text Available Compression-compression fatigue tests were carried out on T300/5405 composite laminates after low-velocity impact, compression performance of the laminates with different impact damages was studied together with its fatigue life and damage propagation under different stress levels, then the effects of impact energy, stress level and damage propagation on fatigue life of laminates were discussed. The results indicate that impact damage can greatly reduce the residual strength of laminates; under low fatigue load levels, the higher impact energy is, the shorter the fatigue life of laminates with impact damage will be; damage propagation undergoes two stages during the fatigue test, namely the steady propagation and the rapid propagation, accounting for 80% and 20% of the overall fatigue life, respectively; damage propagation rate decreases with the reduction of stress level.

  14. Metabolic factors limiting performance in marathon runners.

    Directory of Open Access Journals (Sweden)

    Benjamin I Rapoport

    Full Text Available Each year in the past three decades has seen hundreds of thousands of runners register to run a major marathon. Of those who attempt to race over the marathon distance of 26 miles and 385 yards (42.195 kilometers, more than two-fifths experience severe and performance-limiting depletion of physiologic carbohydrate reserves (a phenomenon known as 'hitting the wall', and thousands drop out before reaching the finish lines (approximately 1-2% of those who start. Analyses of endurance physiology have often either used coarse approximations to suggest that human glycogen reserves are insufficient to fuel a marathon (making 'hitting the wall' seem inevitable, or implied that maximal glycogen loading is required in order to complete a marathon without 'hitting the wall.' The present computational study demonstrates that the energetic constraints on endurance runners are more subtle, and depend on several physiologic variables including the muscle mass distribution, liver and muscle glycogen densities, and running speed (exercise intensity as a fraction of aerobic capacity of individual runners, in personalized but nevertheless quantifiable and predictable ways. The analytic approach presented here is used to estimate the distance at which runners will exhaust their glycogen stores as a function of running intensity. In so doing it also provides a basis for guidelines ensuring the safety and optimizing the performance of endurance runners, both by setting personally appropriate paces and by prescribing midrace fueling requirements for avoiding 'the wall.' The present analysis also sheds physiologically principled light on important standards in marathon running that until now have remained empirically defined: The qualifying times for the Boston Marathon.

  15. The performance impact of context in TQM implementation: the nursing facility industry.

    Science.gov (United States)

    Weech-Maldonado, R; Zinn, J E; Hamilton, R D

    2001-08-01

    This study develops a model and empirically assesses how# organizational context mediates the impact of total quality management (TQM) implementation on perceived performance in the nursing facility industry. Outcomes are analysed for financial, human resources and resident-care performance. Contextual factors related to TQM implementation include managerial control, reward systems, organizational structure and the extent of implementation. Duration of TQM implementation is included as a control variable. Benchmarking has a positive impact on financial outcomes, and the extent of TQM implementation and required reporting of quality improvement activity results have a positive impact on both financial and human resources performance. The presence of a Quality Steering Council has a positive impact on financial performance, but only among larger facilities.

  16. The Digital Divide and Its Impact on Academic Performance

    Science.gov (United States)

    Sun, Jerry Chih-Yuan; Metros, Susan E.

    2011-01-01

    The purpose of this article is to explore issues of the digital divide and its impact on academic performance. Research shows that proper use of technology by students increases their academic performance outcomes. In the literature review section, the authors review articles and theories based on Bennett's (2001) societal equity framework. The…

  17. Performance factors of Czech brewing industry companies

    Directory of Open Access Journals (Sweden)

    Gabriela Chmelíková

    2013-01-01

    Full Text Available The aim of this paper is to identify and subsequently quantify the intensity of relation between selected value drivers of Czech brewing industry companies and thus answer the question of what the significance level of partial indicators influencing the economic value added in the Czech brewing industry is. The aim was achieved by construction and application of multifactorial model for value generators explanation, which represents a synthesis of the INFA model and performance system Balanced Scorecard. The features typical for the first part of the model are algorithmized relations and financial character of the elements, while in the second with non-financial elements the ability of algorithmization is lost and the connection are defined solely on the basis of causality. This inconsistency also implied the difference in the character of analysis results. The proposed model made it possible to identify the most significant generators of value in the Czech brewing industry and it thus became an important guideline for brewery management. The results of the analysis offer a comprehensive overview of the most important value generators and thus enable the company managers to attain the goals of the owners more effectively.

  18. Weighing the impact (factor) of publishing in veterinary journals.

    Science.gov (United States)

    Christopher, Mary M

    2015-06-01

    The journal in which you publish your research can have a major influence on the perceived value of your work and on your ability to reach certain audiences. The impact factor, a widely used metric of journal quality and prestige, has evolved into a benchmark of quality for institutions and graduate programs and, inappropriately, as a proxy for the quality of individual authors and articles, affecting tenure, promotion, and funding decisions. As a result, despite its many limitations, publishing decisions by authors often are based solely on a journal's impact factor. This can disadvantage journals in small disciplines, such as veterinary medicine, and limit the ability of authors to reach key audiences. In this article, factors that can influence the impact factor of a journal and its applicability, including precision, citation practices, article type, editorial policies, and size of the research community will be reviewed. The value and importance of veterinary journals such as the Journal of Veterinary Cardiology for reaching relevant audiences and for helping shape disciplinary specialties and influence clinical practice will also be discussed. Lastly, the efforts underway to develop alternative measures to assess the scientific quality of individual authors and articles, such as article-level metrics, as well as institutional measures of the economic and social impact of biomedical research will be considered. Judicious use of the impact factor and the implementation of new metrics for assessing the quality and societal relevance of veterinary research articles will benefit both authors and journals.

  19. ORGANIZATIONAL STRESS AND ITS IMPACT ON WORK PERFORMANCE

    Directory of Open Access Journals (Sweden)

    Costin Madalina - Adriana

    2011-07-01

    Full Text Available Nowadays, in times of economic crisis, most managers or entrepreneurs have to cope with a lot of new job challenges which can easily transform into stressors. Work related stress is of growing concern because it has significant economic implications for the organization. Even if some stress is a normal part of life, excessive stress can influence one's productivity, health and emotions and it has to be taken under control. When people lose confidence, they refuse to take responsibilities, they get quickly irritated, they are unsatisfied of their job, their performance will be very low and the organization will be in danger. Fortunately, most managers and entrepreneurs know which stress main symptoms are and have the necessary knowledge for managing and reducing it before it can affect employees' daily work. Stress can have an impact both on the organizational welfare and on personal behavior of supervisors or employees, that's why, the ability of managing it can make the difference between job's success or failure. The purpose of this paper is to study Romanian managers and entrepreneurs from Bihor County's perception regarding the stress phenomenon, if they feel that they are affected by stress, if they promote some methods to reduce it and if they consider that stress can influence the organizational performance. As a research method we used an online questionnaire, applied to a number of 75 managers and entrepreneurs that represent the target group of the project "Flexibility and performance through management", project financed by the European Social Fund - "Invest in people". Each participant had to answer a number of 35 questions regarding stress and the results will be presented in this paper. The main conclusion is that, even if job itself is seen as a stressor, there are other important factors that can produce stress such as: family problems, personal problems or social problems.

  20. Research on menstrual cycle performance and impact factors of freshman girls in certain college in Jiangsu%江苏某高校大一女生月经情况调查及相关因素分析

    Institute of Scientific and Technical Information of China (English)

    艾梅; 鲁燕; 苏春娟; 王艾丽; 成兴波

    2015-01-01

    目的:调查大一女大学生的月经状况并分析月经周期影响因素,调查女学生的月经知识、态度及行为,为高校采取针对性的措施提供科学依据。方法对苏州卫生技术学院1012名大一女生进行问卷调查,调查其月经情况、月经知识、态度及行为,并对月经周期影响因素进行分析。结果回收有效问卷1006份。初潮年龄的中位数14岁。初潮年龄与体重、皮褶厚度呈负相关。月经不规则的发生率为20.78%。月经失调者的发生率为80.1%。月经不规则与经期洗冷水澡、经期睡眠不佳、吃辛辣食物有关。较高比率大一女生月经知识、态度及行为需要纠正。结论对高校大一女生应有针对性开展月经期保健及避孕知识的宣教,建立青春期卫生保健咨询小组,保障学生的身心健康。%Objective To investigate the situation of college freshman girls'menstruation and analyze the impact factors of menstrual cycle, to survey the female students'menstruation knowledge, attitudes and behavior, and provide scientific basis for college to take pointed measures.Methods Questionnaire survey was conducted among 1012 freshman girls in Suzhou institute of health technology.Investigating the menstruation knowledge、attitude、behavior and analyze the impact factors during the menstrual cycle.Results 1,006 valid questionnaires were collected.Mean age at menarche was 14 years old.Age at menarche was negatively correlated with weight and skin fold thickness.The incidence of irregular menstruation was 20.78%.The incidence of menstrual disorders was 80.1%.Irregular menstruation was correlated with cold bath、poor sleep and spicy diet in menstrual period.Higher ratio of freshman girls'menstruation attitude and behavior should be corrected.Conclusions It is imperative to carry on menstrual period care and contraceptive knowledge education among college freshman girls. Establishing adolescent health

  1. Analyzing Risk and Performance Using the Multi-Factor Concept

    NARCIS (Netherlands)

    E.M. Vermeulen (Erik); J. Spronk (Jaap); N. van der Wijst (Nico)

    1996-01-01

    textabstractIn this paper, we present a new model to analyze the risk and the expected level of firm performance. This model is based on the multi-factor approach to risk, in which unexpected performance is explained through sensitivities to unexpected changes of risk factors. Instead of using the m

  2. Ability performance of older workers - Internal and external influencing factors

    NARCIS (Netherlands)

    Dittmann-Kohli, F.; Heijden, B.I.J.M. van der

    1996-01-01

    Internal and external factors affecting ability and performance of older employees are being analyzed in a short literature review. Internal factors like physical capacity, sensory capacity, cognitive abilities and general health are reduced with ageing; their effect on performance, however, depends

  3. Musical expertise has minimal impact on dual task performance

    OpenAIRE

    Cocchini, Gianna; Filardi, Maria Serena; Crhonkova, Marcela; Halpern, Andrea

    2017-01-01

    Studies investigating effect of practice on dual task performance have yielded conflicting findings, thus supporting different theoretical accounts about the organization of attentional resources when tasks are performed simultaneously. Because practice has been proven to reduce the demand of attention for the trained task, the impact of long-lasting training on one task is an ideal way to better understand the mechanisms underlying dual task decline in performance. \\ud \\ud Our study compared...

  4. Impact of Customer Retention Practices on Firm Performance

    OpenAIRE

    K. Gengeswari; P. Padmashantini; S.A. Sharmeela-Banu

    2013-01-01

    Customer retention has become the buzzword among both practitioners and academics due to its significant impact towards the improvement in firm performance. Though firm performance is normally evaluated using financial measures, this paper has utilized non-financial measure i.e. customer satisfaction. This is due to the appropriateness of its application to measure performance of service-oriented (retail) firms. This study was conducted using mall-intercept surveys at AEON Perak, Malaysia whe...

  5. Environmental Performance in Countries Worldwide: Determinant Factors and Multivariate Analysis

    Directory of Open Access Journals (Sweden)

    Isabel Gallego-Alvarez

    2014-11-01

    Full Text Available The aim of this study is to analyze the environmental performance of countries and the variables that can influence it. At the same time, we performed a multivariate analysis using the HJ-biplot, an exploratory method that looks for hidden patterns in the data, obtained from the usual singular value decomposition (SVD of the data matrix, to contextualize the countries grouped by geographical areas and the variables relating to environmental indicators included in the environmental performance index. The sample used comprises 149 countries of different geographic areas. The findings obtained from the empirical analysis emphasize that socioeconomic factors, such as economic wealth and education, as well as institutional factors represented by the style of public administration, in particular control of corruption, are determinant factors of environmental performance in the countries analyzed. In contrast, no effect on environmental performance was found for factors relating to the internal characteristics of a country or political factors.

  6. CONSIDERATIONS REGARDING THE FACTORS THAT INFLUENCE THE PERFORMANCE OF CLUSTER

    Directory of Open Access Journals (Sweden)

    DANA-CODRUŢA DUDĂ-DĂIANU

    2012-05-01

    Full Text Available Economic performance is an objective of each cluster and innovation is a result of future performance indicator. The working paper proposed to measure the cluster performance based on three success factors: competitiveness cluster, cluster growth and the degree of the objectives. Based on Porter's diamond model will be a breakdown of the main factors influencing the development of clusters and their delineation in general and specific factors cluster. In the same time, will analyze the main directions that define performance clusters: access to resources, access to specialized knowledge, entrepreneurship based on the opportunities, collaboration between organizations and cluster specific organizational culture.

  7. Impact of alcohol consumption on academic performance of university students

    OpenAIRE

    Tyburcová, Iva

    2012-01-01

    This bachelor thesis examines the impact of alcohol consumption on academic performance of university students. This impact was examined on students studying economics at University of Economics, Prague. Dataset was obtained from students by questionnaire survey and was subsequently supplemented by official data from the university's database. Based on the theoretical model an econometric model which examines the relationship was build. The results showed that intensity of consumption of alco...

  8. The Impact of Mobile Learning on ESP Learners' Performance

    OpenAIRE

    Fahad Alkhezzi; Wadha Al-Dousar

    2016-01-01

    This study explores the impact of using mobile phone applications, namely Telegram Messenger, on teaching and learning English in an ESP context. The main objective is to test whether using mobile phone applications have an impact on ESP learners’ performance by mainly investigating the influence such teaching technique can have on learning vocabulary, and how this can affect the learner's’ ability to use grammar correctly and whether their writing skill is improved. The results showed that u...

  9. Impact of alcohol consumption on academic performance of university students

    OpenAIRE

    2012-01-01

    This bachelor thesis examines the impact of alcohol consumption on academic performance of university students. This impact was examined on students studying economics at University of Economics, Prague. Dataset was obtained from students by questionnaire survey and was subsequently supplemented by official data from the university's database. Based on the theoretical model an econometric model which examines the relationship was build. The results showed that intensity of consumption of alco...

  10. Complete Impact Factor (CIF): A full index to evaluate journal impact

    OpenAIRE

    WenJun Zhang

    2015-01-01

    In this article, a full index to evaluate journal impact, Complete Impact Factor (CIF), was proposed. In general, CIF= total citations for published articles in the journal since it has been sponsored / total number of published articles of the journal since it has been sponsored. CIF changes dynamically over time.

  11. Complete Impact Factor (CIF: A full index to evaluate journal impact

    Directory of Open Access Journals (Sweden)

    WenJun Zhang

    2015-03-01

    Full Text Available In this article, a full index to evaluate journal impact, Complete Impact Factor (CIF, was proposed. In general, CIF= total citations for published articles in the journal since it has been sponsored / total number of published articles of the journal since it has been sponsored. CIF changes dynamically over time.

  12. Factors affecting the performance of professional nurses in Namibia

    Directory of Open Access Journals (Sweden)

    Magdalene H. Awases

    2013-01-01

    Full Text Available Background: Professional nurses play a vital role in the provision of health care globally. The performance of health care workers, including professional nurses, link closely to the productivity and quality of care provision within health care organisations. It was important to identify factors influencing the performance of professional nurses if the quality of health care delivery was to improved.Objectives: The aim of the present study was to identify factors affecting the performance of professional nurses in Namibia.Method: A quantitative, descriptive survey was used to collect data by means of a questionnaire. A random sample of 180 professional nurses was selected from six hospitals in three regions of Namibia.Results: Factors affecting the performance of nurses negatively were identified such as: lack of recognition of employees who are performing well, quality performance outcomes and an absence of a formal performance appraisal system and poor working conditions. Various factors contribute to both the positive and negative performance of professional nurses in Namibia. Strategies were developed for addressing the negative factors that could positively affect the performance of professional nurses in Namibia.Conclusions: This study emphasises the importance of developing strategies to promote the performance of nurses; build knowledge and expertise; develop mechanisms for improving the performance of nurses; expand leadership and management capacity; and generate information and knowledge through research.

  13. 影响激光驱动器注入镜组特性的误差因素分析%AnaIysis of Error Factor Impacting on the Performance of Laser-driver Injection Compound Lens

    Institute of Scientific and Technical Information of China (English)

    柏占伟; 谢志江; 袁晓东

    2014-01-01

    研究了惯性约束大功率激光聚变驱动器注入镜组特性影响因素,分析表明透镜的几何尺寸公差、透镜装配公差和镜组在线安装公差等因素对镜组焦距公差、焦斑分布、波像差方面的特性影响较大。针对影响镜组特性的主要因素,建立了镜组特性影响分析的相关数学模型,并基于MatIab和Zemax软件平台对模型进行模拟计算,结果表明数学模型可以保证镜组特性需要的制造、安装公差。%During the study Of aII kinds Of tOIerance infIuencing factOrs On the perfOrmance Of injectiOn cOmpOund Iens made Of high pOwer Iaser inertiaI cOnfinement fusiOn drive,anaIysis shOws that geOmetry dimensiOn tOIerance Of the Iens,Iens assembIy tOIerance and cOmpOund Iens have a significant effect On the perfOmance Of cOmpOund Iens fOcaI Iength tOIerance, fOcaI spOt pOsitiOn and wave aberratiOn. AccOrding tO the main infIuencing factOrs,reIated perfOrmance mathematicaI mOdeIs are set up. The mOdeIs are simuIated and the resuIts Of simuIatiOn are anaIyzed based On the sOftware pIatfOrm Of MatIab and Zemax. The manufacturing and instaIIatiOn tOIerance ensuring the perfOrmance are aIsO determined based On the simuIatiOn resuIts and tOIerance Of cOmpOund Iens.

  14. AGU journals increase in importance according to 2010 Impact Factors

    Science.gov (United States)

    Cook, Bill

    2011-07-01

    AGU journals continue to rank highly in many categories in the 2010 Journal Citation Report (JCR), which was released by Thomson Reuters on 28 June. JCR reports on several measures of journal usage, including a journal's Eigenfactor score, its Article Influence score, its Impact Factor, and its rank within a cohort of similar journals. According to the 2010 statistics, AGU again has outperformed its larger competitors. Four different AGU titles are ranked in the top three journals in six different cohorts. The Impact Factor of several AGU journals increased significantly over the previous year.

  15. Rethinking the meaning and significance of journal impact factors.

    Science.gov (United States)

    Ironside, Pamela M

    2007-06-01

    It is not the case that impact factors are unhelpful and that their use should be abolished. Indeed, ISI is continuing to refine existing and develop new databases to provide important information to researchers, administrators, librarians, and editors. Impact factor data do provide useful information for the review process if used judiciously and with an awareness of what these data do and do not indicate. Perhaps it is timely for members of the nursing discipline to think more broadly about the nature of impact and to talk more about the ways in which review processes can account for the many ways the impact of research can be demonstrated. For example, as part of the review process, reviewers might ask each researcher to provide exemplars from teaching or clinical practice settings in which their research is actually being used. Researchers might also be asked to describe the impact that has occurred in ways other than through publication (e.g., presentations, consulting) and how this impact was determined. Creating review processes that allow researchers to describe their decision making related to disseminating their research and how this reflects their ability to influence the discipline may provide a more realistic picture of impact than calculated figures alone.

  16. Integrated Impacts of environmental factors on the degradation of fumigants

    Science.gov (United States)

    Lee, J.; Yates, S. R.

    2007-12-01

    Volatilization of fumigants has been concerned as one of air pollution sources. Fumigants are used to control nematodes and soil-born pathogens for a pre-plant treatment to increase the production of high-cash crops. One of technologies to reduce the volatilization of fumigants to atmosphere is to enhance the degradation of fumigants in soil. Fumigant degradation is affected by environmental factors such as moisture content, temperature, initial concentration of injected fumigants, and soil properties. However, effects of each factor on the degradation were limitedly characterized and integrated Impacts from environmental factors has not been described yet. Degradation of 1,3- dichloropropene (1,3-D) was investigated in various condition of temperatures (20-60 °C), moisture contents (0 ¡V 30 %) and initial concentrations (0.6 ¡V 60 mg/kg) with Arlington sandy loam soil. Abiotic and biotic degradation processes were distinguished using two sterilization methods with HgCl2 and autoclave and impacts of environmental factors were separately assessed for abiotic and biotic degradations. Initially, degradation rates (k) of cis and trans 1,3-D isomers were estimated by first-order kinetics and modified depending on impacts from environmental factors. Arrhenius equation and Walker¡¦s equation which were conventionally used to describe temperature and moisture effects on degradation were assessed for integrated impacts from environmental factors and logarithmical correlation was observed between initial concentrations of applied fumigants and degradation rates. Understanding integrated impacts of environmental factors on degradation will help to design more effective emission reduction schemes in various conditions and provide more practical parameters for modeling simulations.

  17. Performance analysis of parallel supernodal sparse LU factorization

    Energy Technology Data Exchange (ETDEWEB)

    Grigori, Laura; Li, Xiaoye S.

    2004-02-05

    We investigate performance characteristics for the LU factorization of large matrices with various sparsity patterns. We consider supernodal right-looking parallel factorization on a bi-dimensional grid of processors, making use of static pivoting. We develop a performance model and we validate it using the implementation in SuperLU-DIST, the real matrices and the IBM Power3 machine at NERSC. We use this model to obtain performance bounds on parallel computers, to perform scalability analysis and to identify performance bottlenecks. We also discuss the role of load balance and data distribution in this approach.

  18. Impact of HFIR LEU Conversion on Beryllium Reflector Degradation Factors

    Energy Technology Data Exchange (ETDEWEB)

    Ilas, Dan [ORNL

    2013-10-01

    An assessment of the impact of low enriched uranium (LEU) conversion on the factors that may cause the degradation of the beryllium reflector is performed for the High Flux Isotope Reactor (HFIR). The computational methods, models, and tools, comparisons with previous work, along with the results obtained are documented and discussed in this report. The report documents the results for the gas and neutronic poison production, and the heating in the beryllium reflector for both the highly enriched uranium (HEU) and LEU HFIR configurations, and discusses the impact that the conversion to LEU may have on these quantities. A time-averaging procedure was developed to calculate the isotopic (gas and poisons) production in reflector. The sensitivity of this approach to different approximations is gauged and documented. The results show that the gas is produced in the beryllium reflector at a total rate of 0.304 g/cycle for the HEU configuration; this rate increases by ~12% for the LEU case. The total tritium production rate in reflector is 0.098 g/cycle for the HEU core and approximately 11% higher for the LEU core. A significant increase (up to ~25%) in the neutronic poisons production in the reflector during the operation cycles is observed for the LEU core, compared to the HEU case, for regions close to the core s horizontal midplane. The poisoning level of the reflector may increase by more than two orders of magnitude during long periods of downtime. The heating rate in the reflector is estimated to be approximately 20% lower for the LEU core than for the HEU core. The decrease is due to a significantly lower contribution of the heating produced by the gamma radiation for the LEU core. Both the isotopic (gas and neutronic poisons) production and the heating rates are spatially non-uniform throughout the beryllium reflector volume. The maximum values typically occur in the removable reflector and close to the midplane.

  19. Examining significant factors in micro and small enterprises performance: case study in Amhara region, Ethiopia

    Science.gov (United States)

    Cherkos, Tomas; Zegeye, Muluken; Tilahun, Shimelis; Avvari, Muralidhar

    2017-07-01

    Furniture manufacturing micro and small enterprises are confronted with several factors that affect their performance. Some enterprises fail to sustain, some others remain for long period of time without transforming, and most are producing similar and non-standard products. The main aim of this manuscript is on improving the performance and contribution of MSEs by analyzing impact of significant internal and external factors. Data was collected via a questionnaire, group discussion with experts and interviewing process. Randomly selected eight representative main cities of Amhara region with 120 furniture manufacturing enterprises are considered. Data analysis and presentation was made using SPSS tools (correlation, proximity, and T test) and impact-effort analysis matrix tool. The correlation analysis shows that politico-legal with infrastructure, leadership with entrepreneurship skills and finance and credit with marketing factors are those factors, which result in high correlation with Pearson correlation values of r = 0.988, 0.983, and 0.939, respectively. The study investigates that the most critical factors faced by MSEs are work premises, access to finance, infrastructure, entrepreneurship and business managerial problems. The impact of these factors is found to be high and is confirmed by the 50% drop-out rate in 2014/2015. Furthermore, more than 25% work time losses due to power interruption daily and around 65% work premises problems challenged MSEs. Further, an impact-effort matrix was developed to help the MSEs to prioritize the affecting factors.

  20. Use of Journal Citation Reports and Journal Performance Indicators in measuring short and long term journal impact.

    Science.gov (United States)

    Garfield, E

    2000-12-01

    The impact factor has become the subject of widespread controversy. It has gradually developed to mean both journal and author impact. The emphasis on impact factors obscures the main purpose of bibliographic databases created at the Institute for Scientific Information. I will here show how two of these databases, Journal Citation Reports and the Journal Performance Indicators, can be used to study scientific journals and the articles they publish, as well as the evolution of scientific fields.

  1. Organizational Wisdom and its Impact on Firm Innovation and Performance

    Directory of Open Access Journals (Sweden)

    Ali Ekber AKGÜN

    2015-11-01

    Full Text Available As a fascinating concept, the term organizational wisdom started to attract many researchers from a variety of disciplines. Nevertheless, how the organizational wisdom related practices, such as virtue and practicality, impact the firm innovativeness and financial performance is rarely argued in the literature. We argued that virtue and practicality practices positively impact the firm’s innovativeness with increasing level of environmental uncertainty. We also mentioned that firm innovativeness positively mediates the relationship between organizational wisdom and firm financial performance. Further, we argued the managerial and theoretical implications of the study.

  2. Impact of Formulas, Language and Instruction on Student Performance on Cost-Volume-Profit Problems

    Science.gov (United States)

    Johnson, Benny G.; Sargent, Carol Springer

    2014-01-01

    This study investigated how three factors impacted performance on cost-volume-profit homework problems: language, formula use, and instruction. Students enrolled in Introduction to Financial Accounting (the first principles of accounting course) and Managerial Accounting (the second principles of accounting course) from eight different US colleges…

  3. The impact of protein supplementation on cognitive performance in frail elderly

    NARCIS (Netherlands)

    Zwaluw, van der N.L.; Rest, van de O.; Tieland, C.A.B.; Adam, J.J.; Hiddink, G.J.; Loon, van L.J.C.; Groot, de C.P.G.M.

    2014-01-01

    Purpose Maintenance of cognitive abilities is important for elderly to stay independent. With the aging of the population, the call for modifiable factors is emerging. Dietary protein might improve cognitive performance; however, this has hardly been studied. Therefore, we studied the impact of 24-w

  4. Conceptual Writing in College-Level Mathematics Courses and Its Impact on Performance and Attitude

    Science.gov (United States)

    Van Dyke, Frances; Malloy, Elizabeth J.; Stallings, Virginia (Lyn)

    2015-01-01

    This study looks at the impact of college students' writing on a regular basis about mathematical concepts. Specifically we examine the effect of this practice on performance and attitude while controlling for confounding factors. Two professors and a total of 97 students in four different classes participated in the study. Students in the…

  5. The Impact of Increases in Subsidiary Autonomy and Network Relationships on Performance

    DEFF Research Database (Denmark)

    Gammelgaard, Jens; McDonald, Frank; Stephan, Andreas

    2012-01-01

    This paper uses network approaches to subsidiary theory to investigate the performance impacts of interactions among the factors of autonomy, intra-organizational network relationships, and inter-organizational network relationships. The paper offers an analysis of both direct and indirect intera...

  6. Impact of Students' Financial Strength on their Academic Performance

    African Journals Online (AJOL)

    Toshiba

    The self-sponsored students are ... money affects student‟s academic performance. .... they go out to buy. ... showing intimidation when faced with failure are factors influencing ..... Agricultural and Consumer Economics, University of Illinois.

  7. Multidimensional journal evaluation analyzing scientific periodicals beyond the impact factor

    CERN Document Server

    Haustein, Stefanie

    2012-01-01

    Scientific communication depends primarily on publishing in journals. The most important indicator to determine the influence of a journal is the Impact Factor. Since this factor only measures the average number of citations per article in a certain time window, it can be argued that it does not reflect the actual value of a periodical. This book defines five dimensions, which build a framework for a multidimensional method of journal evaluation. The author is winner of the Eugene Garfield Doctoral Dissertation Scholarship 2011.

  8. The Impact of Tax Pressure on Companies’ Performance Case Study: OECD Europe Zone

    OpenAIRE

    Georgeta VINTILA; Ioana Laura TIBULCA

    2013-01-01

    There are many factors that influence managers' confidence in the business environment. Of all these factors of influence, the impact of taxation on business performance is the subject of the present study. To analyze how taxation affects the business confidence index, we used data collected for OECD European countries in estimating two different regression models. Our results will show that managers take changes in taxation into account when they anticipate the evolution of the business envi...

  9. Impact of intraformational water zones on SAGD performance

    Energy Technology Data Exchange (ETDEWEB)

    Fairbridge, J.K.; Gates, I.D. [Dept. of Chemical and Petroleum Engineering, University of Calgary (Canada); Cey, E. [Dept. of Geoscience, University of Calgary (Canada)

    2011-07-01

    In the Alberta oil sands steam assisted gravity drainage (SAGD) is used to reduce oil viscosity. It has been found that intraformational water zones exist in oil sand reservoirs and they can act either act as thief zones or be sealed off by mobilized bitumen. The aim of this paper is to determine the effect of intraformational water zones on SAGD performance. A rectangular reservoir was modeled and thermal reservoir simulations were carried out using the commercial CMG simulator on a base case and other scenarios. Results showed that water zones have an important impact on SAGD performance, the inclusion of water channels induced production drops while an increase of connectedness of water zones improved production performance. This study highlighted that water zones have an important impact on SAGD performance whether it is a positive or a negative one.

  10. Factors impacting self-care for urinary incontinence.

    Science.gov (United States)

    Milne, Jill L; Moore, Katherine N

    2006-02-01

    Behavioral strategies such as pelvic floor muscle exercises (PFME), bladder retraining, and dietary modifications are generally considered to be the first line of treatment for urinary incontinence (UI). Yet little is understood about the client's abilities/motivation to manage their UI in the home setting. Self-care, the ability of clients to act on their own behalf to achieve and maintain health, is a fundamental component of these strategies. Despite the frequently chronic nature of UI, there is growing evidence that such maintenance of behavioral therapies is sporadic at best. The purpose of this study was to enhance understanding of self-care strategies that individuals with UI employ, the perceived benefits of these strategies, the factors that influence their self-care choices, and the factors that impede or facilitate maintenance of behavioral therapies. In this qualitative descriptive study, individual and focus group interviews with community-dwelling participants were conducted to enhance understanding regarding the participants' management of UI at home and why they maintain certain strategies and not others. Data were collected via loosely constructed individual (n=25) and focus group (n=3) interviews to facilitate open discussion of participants' perceptions. Thirty-eight individuals (33 women and 5 men) participated in the study. Analysis of data resulted in a major category of self-care strategies related to UI that was further subcategorized into factors that facilitated PFME and barriers to PFME performance. Factors that facilitated PFME included: (a) realistic goals and expectation, (b) positive affirmation, (c) follow up, and (d) maintaining an exercise routine. Barriers noted were: (a) insufficient information, (b) characteristics of the exercises, (c) competing interests, (d) financial cost, and (e) minor psychosocial impact. This study described the self-care strategies that participants with UI had initiated and maintained and additionally

  11. Evaluating Academic Journals without Impact Factors for Collection Management Decisions.

    Science.gov (United States)

    Dilevko, Juris; Atkinson, Esther

    2002-01-01

    Discussion of evaluating academic journals for collection management decisions focuses on a methodological framework for evaluating journals not ranked by impact factors in Journal Citation Reports. Compares nonranked journals with ranked journals and then applies this framework to a case study in the field of medical science. (LRW)

  12. Why do statistics journals have low impact factors?

    NARCIS (Netherlands)

    van Nierop, Erjen

    In this paper, we answer the question why statistics journals get lower impact factors than journals in other disciplines. We analyze diffusion patterns of papers in several journals in various academic fields. To obtain insights into the diffusion of the citation counts of the papers, the data are

  13. Field-normalization of impact factors: rescaling versus fractionally counted

    NARCIS (Netherlands)

    Leydesdorff, L.; Radicchi, F.; Bornmann, L.; Castellano, C.; de Nooy, W.; Gorraiz, J.; Schiebel, E.; Gumpenberger, C.; Hörlesberger, M.; Moed, H.

    2013-01-01

    Two methods for comparing impact factors and citation rates across fields of science are tested against each other using citations to the 3,705 journals in the Science Citation Index 2010 (CD-Rom version of SCI) and the 13 field categories used for the Science and Engineering Indicators of the US Na

  14. Evaluating Academic Journals Using Impact Factor and Local Citation Score

    Science.gov (United States)

    Chung, Hye-Kyung

    2007-01-01

    This study presents a method for journal collection evaluation using citation analysis. Cost-per-use (CPU) for each title is used to measure cost-effectiveness with higher CPU scores indicating cost-effective titles. Use data are based on the impact factor and locally collected citation score of each title and is compared to the cost of managing…

  15. Impact Factor for Exclusive Diffractive Dijet Production with NLO Accuracy

    CERN Document Server

    Boussarie, R; Szymanowski, L; Wallon, S

    2016-01-01

    Relying on the shockwave approach, we present the main steps of the computation of the impact factor for the exclusive diffractive photo- or electro- production of a forward dijet with NLO accuracy. We provide details of the cancellation mechanisms for all the divergences which appear in the intermediate results.

  16. Why do statistics journals have low impact factors?

    NARCIS (Netherlands)

    van Nierop, Erjen

    2009-01-01

    In this paper, we answer the question why statistics journals get lower impact factors than journals in other disciplines. We analyze diffusion patterns of papers in several journals in various academic fields. To obtain insights into the diffusion of the citation counts of the papers, the data are

  17. The impact of knowledge management on MNC subsidiary performance

    DEFF Research Database (Denmark)

    Mahnke, Volker; Pedersen, Torben; Venzin, Markus

    2003-01-01

    Empirical studies on the impact of knowledge management on the performance of MNCsubsidiaries remain elusive to date. This study examines the effect of knowledgemanagement tools such as corporate university, communities of practice, groupbenchmarking, learning systems and rewards upon absorptive...... capacity and performancewith unique data from subsidiary units in a large German MNC - Heidelberger Cement.The findings suggest that knowledge management tools unfold their performanceimpact through their significant influence on absorptive capacity and knowledgeinflows. The key contributions...... performance....

  18. DEPENDENCE RELATIONSHIP BETWEEN THE CRITICAL QUALITY FACTORS AND SOCIAL IMPACT

    Directory of Open Access Journals (Sweden)

    José Álvarez García

    2014-10-01

    Full Text Available This paper shows the results of the empirical study conducted in 186 tourist accommodation businesses in Spain certified under the “Q for Tourist Quality”, own System Quality Management. It was raised with the purpose of analyzing the structure of the relationship between critical quality factors and results-social impact, how they operate and the level of their influence on obtaining these results within the company. Starting from a deep theoretical revision we propose a theoretical model together with the hypotheses to be tested, and we proceed to validation using the technique of Structural Equation Models. The results obtained show that companies wishing to improve their social impact should take into account that leadership is the most important factor to achieve it. Leadership indirectly affects the social impact through its influence on alliances and resources, quality policy/planning, personnel management and learning.

  19. Experimental investigation on impact performances of GLARE laminates

    Directory of Open Access Journals (Sweden)

    Chen Qi

    2015-12-01

    Full Text Available An experimental investigation was carried out on the damage resistance to a concentrated quasi-static indentation force and low-velocity impact of four kinds of glass-reinforced aluminum laminates (GLARE for short. Compared with the experimental results of the CFRP (Carbon Fiber Reinforced Plastics laminates, the performance of GLARE was determined. By means of concentrated quasi-static indentation force test, typical force–displacement response, the maximum contact force and dent depth were received. Through drop-weight low-velocity impact tests, impact force histories, indentation depths (through a new method and dissipated energy were obtained. The test results show that the force–displacement response of GLARE 4 laminates under the concentrated quasi-static indentation force has an obvious flat roof and the failure is instantaneous, which are different from CFRP laminates. The indention will be visible once the impact happens. C-scan results find that there is no delamination besides the impact area after both the concentrated quasi-static indentation and low-velocity impact. The dissipated energy approximately equals the impact energy.

  20. Experimental investigation on impact performances of GLARE laminates

    Institute of Scientific and Technical Information of China (English)

    Chen Qi; Guan Zhidong; Li Zengshan; Ji Zhaojie; Zhuo Yue

    2015-01-01

    An experimental investigation was carried out on the damage resistance to a concen-trated quasi-static indentation force and low-velocity impact of four kinds of glass-reinforced aluminum laminates (GLARE for short). Compared with the experimental results of the CFRP (Carbon Fiber Reinforced Plastics) laminates, the performance of GLARE was determined. By means of concentrated quasi-static indentation force test, typical force–displacement response, the maximum contact force and dent depth were received. Through drop-weight low-velocity impact tests, impact force histories, indentation depths (through a new method) and dissipated energy were obtained. The test results show that the force–displacement response of GLARE 4 laminates under the concentrated quasi-static indentation force has an obvious flat roof and the failure is instantaneous, which are different from CFRP laminates. The indention will be visible once the impact happens. C-scan results find that there is no delamination besides the impact area after both the concentrated quasi-static indentation and low-velocity impact. The dissipated energy approximately equals the impact energy.

  1. Impact of English Proficiency on Academic Performance of International Students

    Science.gov (United States)

    Martirosyan, Nara M.; Hwang, Eunjin; Wanjohi, Reubenson

    2015-01-01

    Using an ex-post facto, non-experimental approach, this research examined the impact of English language proficiency and multilingualism on the academic performance of international students enrolled in a four-year university located in north central Louisiana in the United States. Data were collected through a self-reported questionnaire from 59…

  2. Does Accumulated Knowledge Impact Academic Performance in Cost Accounting?

    Science.gov (United States)

    Alanzi, Khalid A.; Alfraih, Mishari M.

    2017-01-01

    Purpose: This quantitative study aims to examine the impact of accumulated knowledge of accounting on the academic performance of Cost Accounting students. Design/methodology/approach The sample consisted of 89 students enrolled in the Accounting program run by a business college in Kuwait during 2015. Correlation and linear least squares…

  3. The impact of internationalization and diversification on construction industry performance

    NARCIS (Netherlands)

    Horta, Isabel M.; Kapelko, Magdalena; Oude Lansink, Alfons; Camanho, Ana S.

    2016-01-01

    This paper investigates the impact of internationalization and diversification strategies on the financial performance of construction industry companies. The results obtained can guide the design of strategies to pursue company growth and achieve competitive advantage. The evaluation of companie

  4. Impact of Management Style on Performance Indicators of Academic Staff

    Science.gov (United States)

    Irtwange, S. V.; Orsaah, S.

    2009-01-01

    The objective of this study is to assess the impact of management style on academic staff performance with University of Agriculture, Makurdi as a case study. The management style of the vice chancellor of the University of Agriculture, Makurdi between the periods, September 3, 1996 to September 3, 2001 was determined using the Ohio State…

  5. Eastern Baltic cod recruitment revisited—dynamics and impacting factors

    DEFF Research Database (Denmark)

    Köster, Fritz; Huwer, Bastian; Hinrichsen, Hans-Harald

    2016-01-01

    and casting doubts about the magnitude of the recent increase in recruitment. Earlier studies identified main factors impacting on cod reproductive success to be related to the loss of two out of three spawning areas in the 1980s caused by lack of major Baltic inflows with a concurrent reduction in salinity...... and oxygen. Other important factors include prey availability for first-feeding larvae, egg predation by sprat and herring and cannibalism on juveniles, all in one way or the other related to the prevailing hydrographic conditions. These factors cannot explain increased reproductive success in the last...

  6. Impact Factors of Energy Productivity in China: An Empirical Analysis

    Institute of Scientific and Technical Information of China (English)

    Wei Chu; Shen Manhong

    2007-01-01

    This article developed a decomposition model of energy productivity on the basis of the economic growth model. Four factors were considered which may influence China's energy productivity according to this model: technology improvement, resource allocation structure, industrial structure and institute arrangement. Then, an econometric model was employed to test the four factors empirically on the basis of China's statistical data from 1978 to 2004. Results indicated that capital deepening contributes the most (207%) to energy efficiency improvement, and impact from labor forces (13%) is the weakest one in resource factor; industrial structure (7%) and institute innovation (9.5%) positively improve the energy productivity.

  7. Impacts on daily performances attributed to malocclusions by British adolescents.

    Science.gov (United States)

    Bernabé, E; Sheiham, A; de Oliveira, C M

    2009-01-01

    The aim of this study was to assess the prevalence of condition-specific impacts on daily performances attributed to malocclusion in British adolescents. Two hundred 16- to 17-year-old adolescents were randomly selected from 957 children attending a public college in London, UK. During interviews, participants provided information about demographic variables and socio-dental impacts on quality of life attributed to malocclusions, using the Condition-Specific form of the Oral Impacts on Daily Performances (CS-OIDP) index. Adolescents were also clinically examined using the Index of Orthodontic Treatment Need. Statistical comparison by covariates was performed using chi-squared test and chi-squared test for trends. The prevalence of oral impacts on daily performances attributed to any oral condition was 26.5% whereas the prevalence of CS-OIDP attributed to malocclusion was 21.5%. There was no statistically significant difference by sex, age, ethnicity or orthodontic treatment status of schoolchildren in the prevalence of CS-OIDP attributed to malocclusion (P >/= 0.243 for all cases). However, there was a linear trend for the prevalence of CS-OIDP attributed to malocclusion, by level of normative orthodontic treatment need (P = 0.042). The prevalence of such impacts increased from 16.8% for adolescents with no/slight need for orthodontic treatment, to 31.7% for those with definite need for orthodontic treatment. Although findings support the idea that malocclusion has physical, psychological and social effects on quality of life of these adolescents, the inconsistencies in findings between the self-reports of impacts of malocclusion and the assessment of normative needs highlight the shortcomings of using only clinical indexes to estimate orthodontic treatment needs.

  8. Factors Affecting Students' Performance and Practice on Map ...

    African Journals Online (AJOL)

    Factors Affecting Students' Performance and Practice on Map Reading Skills: A ... In Ethiopia, the teaching and learning process of map reading skills is based on ... identifying effective study techniques, the students' willingness to do school ...

  9. CONTRIBUTING FACTORS OF EMPLOYEE’S PERFORMANCE: A CASE STUDY OF LOCAL NGOs IN PESHAWAR CITY

    Directory of Open Access Journals (Sweden)

    Saqib Shahzad

    2015-06-01

    Full Text Available The research study has been focused to study the contributing factors towards employee’s performance. Performance of employees is one of the most significant factors for the growth and success of every organization. Data was collected through the distribution of questionnaires. 120 questionnaires as the sample size were distributed among the employees of local NGOs. The returned questionnaires were 106 having a response rate of 88.33%. The findings of the study found that job security, relationship with colleagues, relationship with supervisor, working conditions and employee’s empowerment were found to have significant impact on employee’s performance.

  10. Effect of Necessary Factors for Deploying E-Business Models on Business Performance in Automotive Industry

    OpenAIRE

    Mohsen Shafiei Nikabadi; Laya Olfat; Ahmad Jafarian; Hassan Alibabaei Khamene

    2013-01-01

    The main goal of this article is to survey effects of necessary factors for deploying e-business models on business performance in automotive industry. Today, application of information technology and internet in business is turned to a critical tool to gain competitive advantages in business. The impact of e-businesses is so that changed competitive approach between companies from traditional to modern models. In this study, first, necessary key factors of implementing e-business in automoti...

  11. Position-specific behaviors and their impact on crew performance: Implications for training

    Science.gov (United States)

    Law, J. Randolph

    1993-01-01

    The present study was motivated by results from a preliminary report documenting the impact of specific crewmembers on overall crew performance (Wilhelm & Law, 1992), and a cross-airline cross-fleet project investigating human factors behaviors of commercial aviation flightcrews (Helmreich, Butler, Whilhelm, & Lofaro, 1992). The purpose of the current investigation is to study how position-specific behaviors impact flightcrew performance, and how these position-specific behaviors differ between two airlines and two flying environments. Implications for training will also be addressed.

  12. Visuospatial Ability Factors and Performance Variables in Laparoscopic Simulator Training

    Science.gov (United States)

    Luursema, Jan-Maarten; Verwey, Willem B.; Burie, Remke

    2012-01-01

    Visuospatial ability has been shown to be important to several aspects of laparoscopic performance, including simulator training. Only a limited subset of visuospatial ability factors however has been investigated in such studies. Tests for different visuospatial ability factors differ in stimulus complexity, in their emphasis on identifying…

  13. Visuospatial ability factors and performance variables in laparoscopic simulator training

    NARCIS (Netherlands)

    Luursema, J.-M.; Verwey, W.B.; Burie, R.

    2012-01-01

    Visuospatial ability has been shown to be important to several aspects of laparoscopic performance, including simulator training. Only a limited subset of visuospatial ability factors however has been investigated in such studies. Tests for different visuospatial ability factors differ in stimulus c

  14. Impact of lighting and attire on 3D scanner performance

    Science.gov (United States)

    Ajjimaporn, Pann; Feist, Dakota; Straub, Jeremy; Kerlin, Scott

    2015-05-01

    This paper considers the impact of lighting and attire on the performance of a previously created low-cost 3D scanning system. It considers the effect of adjusting the lighting configuration and of the subject's clothing on the quality of the scans and the number and types of objects that can be scanned. The experimentation performed tested different types (colors and textures) of clothing to assess which produced the best scans and multiple lighting configurations. This paper presents the results from this experimentation and, from this, make generalizations about optimizing visible light scanner performance before concluding with a discussion of scanner efficacy.

  15. The Impact of Social Networks on Students’ Performance

    Directory of Open Access Journals (Sweden)

    Jusuf Zekiri

    2016-11-01

    Full Text Available The objective of this study is to determine the impact of using social media and its impact on students’ performance and success. This research tries to identify the relationship between students’ use of social networks and their success in their studies. It tries also to find out whether time spent impacts students’ performance and success. Whether students use social media more for entertainment or for teaching and information sharing purposes. The paper uses a quantitative approach for collecting the primary data. The data was collected by surveying 255 respondents from South East European University. The data analyses were done by SPSS so" ware program. Cronbach alpha is used for testing the validity and reliability of variables used in this study. The hypotheses were tested using One Simple T-test. The obtained empirical results show that a great number of students are aware of advantages and disadvantages by the social media. Thus, due to a great percent of times spent on social networking activities, the performance and the success of students suffer setbacks which could lead to a poor performance and they might fail to create a balance between the social media and academic activities. Furthermore, it is about their addiction, the loss of time leading to consequences in their academic development, and they are also influenced to a great extent negatively by the social networking sites, because their attention is focused on chatting and music while their academic activities are neglected. Finally, based on the results of survey, we can conclude that impact of social media on the academic performance of students should focus more on the positive side than on the negative side to achieve balance. Hence, creating more pages for research and academic activities will enable students to improve their performance, thereby avoiding a distraction which leads to deviation from their academic work.

  16. Impact Performance of 3D Integrated Cellular Woven Composite Panel

    Institute of Scientific and Technical Information of China (English)

    TIAN Wei; ZHU Cheng-yan

    2006-01-01

    This paper studied the impact resistance of 3D integrated cellular woven composite panel under persudo-static impact,comprised the test result with property of typical 3D woven composites, analyzed some parameters that maybe affect composites' impact resistance and at last used SEM to observe the damage process and mechanism of samples. The result shows that the impact resistance of 3D integrated cellular woven composites is much better than the performance of typical 3D woven composites; it is an active method to improve the impact resistance of composites that developing preform with cellular on the basis of typical 3D woven structure; for different 3D integrated cellular woven structure, the value of absorbed-energy is incrensing with the hollow percentage; tiny deformation will not emerge on samples until the acting force gets to 85% of the maximum;similar with typical 3D woven composites, the delaminated phenomenon of 3D integrated cellular woven composites is also unapparent during impact process.

  17. Where's the impairment: an examination of factors that impact sustained attention following a stressor.

    Science.gov (United States)

    Banks, Jonathan B; Tartar, Jaime L; Welhaf, Matthew S

    2014-01-01

    The impact of stress on cognitive functioning has been examined across multiple domains. However, few studies investigate both physical and psychological factors that impact cognitive performance. The current study examined the impact of a physical and psychosocial stressor on sustained attention and identified factors related to sustained attention, including cortisol, salivary alpha amylase (sAA) and mind wandering. A total of 53 participants completed either the socially evaluated cold pressor task or a control task followed by the sustained attention to response task with mind wandering measures. Participants also provided saliva samples following the attention task. Results indicate the stressor task did not impact mind wandering or sustained attention but increased cortisol and sAA. Mind wandering was negatively related to sustained attention and mediated the relationship between cortisol and sustained attention. The findings highlight the importance of examining multiple sources of stress-related cognitive impairments.

  18. The A&A Experience With Impact Factors

    CERN Document Server

    Sandqvist, A

    2004-01-01

    There is a widespread impression that the scientific journal "Astronomy & Astrophysics" (A&A) has a smaller impact, as measured by citations to articles, than some of the other major astronomy journals. This impression was apparently supported - and probably created - by the Journal Citation Report (JCR), which is prepared annually by the Institute of Scientific Information (ISI) Web of Knowledge. The published poor impact factor of A&A was in fact wrong and was due to a serious flaw in the method used by ISI Web of Knowledge to determine it. The resulting damage inflicted upon A&A by the JCR is incalculable.

  19. Exploratory factor analysis of the Oral Health Impact Profile.

    Science.gov (United States)

    John, M T; Reissmann, D R; Feuerstahler, L; Waller, N; Baba, K; Larsson, P; Celebić, A; Szabo, G; Rener-Sitar, K

    2014-09-01

    Although oral health-related quality of life (OHRQoL) as measured by the Oral Health Impact Profile (OHIP) is thought to be multidimensional, the nature of these dimensions is not known. The aim of this report was to explore the dimensionality of the OHIP using the Dimensions of OHRQoL (DOQ) Project, an international study of general population subjects and prosthodontic patients. Using the project's Learning Sample (n = 5173), we conducted an exploratory factor analysis on the 46 OHIP items not specifically referring to dentures for 5146 subjects with sufficiently complete data. The first eigenvalue (27·0) of the polychoric correlation matrix was more than ten times larger than the second eigenvalue (2·6), suggesting the presence of a dominant, higher-order general factor. Follow-up analyses with Horn's parallel analysis revealed a viable second-order, four-factor solution. An oblique rotation of this solution revealed four highly correlated factors that we named Oral Function, Oro-facial Pain, Oro-facial Appearance and Psychosocial Impact. These four dimensions and the strong general factor are two viable hypotheses for the factor structure of the OHIP.

  20. Identification of coordination factors affecting building projects performance

    Directory of Open Access Journals (Sweden)

    Wesam Salah Alaloul

    2016-09-01

    Full Text Available Construction projects performance requires improvement to fulfil the complexity of the stakeholders’ needs and expectations. Coordination process is proposed as an efficient solution for weak performance of construction projects. Therefore, coordination factors are vital in ensuring a successful implementation of all project phases. This study aimed to identify and prioritise coordination factors that influence the performance of building projects in Malaysian context. A vast body of literature on coordination process was reviewed and resulted in 53 coordination factor. Three rounds of Delphi technique were conducted. The most effective coordination factors were ranked based on the Relative Importance Index (RII such as Scheduling (RII = 0.97, Quality assurance plan (RII = 0.93, and all parties’ participation in plans (RII = 0.89. These coordination factors have fulfilled the research gap and provided better management and higher performance for project parties. The results offer insightful perspectives to define the most effective coordination factors, for addressing the dependency between project tasks and the parties to enhance project performance.

  1. Impact of sludge layer geometry on the hydraulic performance of a waste stabilization pond.

    Science.gov (United States)

    Ouedraogo, Faissal R; Zhang, Jie; Cornejo, Pablo K; Zhang, Qiong; Mihelcic, James R; Tejada-Martinez, Andres E

    2016-08-01

    Improving the hydraulic performance of waste stabilization ponds (WSPs) is an important management strategy to not only ensure protection of public health and the environment, but also to maximize the potential reuse of valuable resources found in the treated effluent. To reuse effluent from WSPs, a better understanding of the factors that impact the hydraulic performance of the system is needed. One major factor determining the hydraulic performance of a WSP is sludge accumulation, which alters the volume of the pond. In this study, computational fluid dynamics (CFD) analysis was applied to investigate the impact of sludge layer geometry on hydraulic performance of a facultative pond, typically used in many small communities throughout the developing world. Four waste stabilization pond cases with different sludge volumes and distributions were investigated. Results indicate that sludge distribution and volume have a significant impact on wastewater treatment efficiency and capacity. Although treatment capacity is reduced with accumulation of sludge, the latter may induce a baffling effect which causes the flow to behave closer to that of plug flow reactor and thus increase treatment efficiency. In addition to sludge accumulation and distribution, the impact of water surface level is also investigated through two additional cases. Findings show that an increase in water level while keeping a constant flow rate can result in a significant decrease in the hydraulic performance by reducing the sludge baffling effect, suggesting a careful monitoring of sludge accumulation and water surface level in WSP systems.

  2. Towards an Accurate Performance Modeling of Parallel SparseFactorization

    Energy Technology Data Exchange (ETDEWEB)

    Grigori, Laura; Li, Xiaoye S.

    2006-05-26

    We present a performance model to analyze a parallel sparseLU factorization algorithm on modern cached-based, high-end parallelarchitectures. Our model characterizes the algorithmic behavior bytakingaccount the underlying processor speed, memory system performance, aswell as the interconnect speed. The model is validated using theSuperLU_DIST linear system solver, the sparse matrices from realapplications, and an IBM POWER3 parallel machine. Our modelingmethodology can be easily adapted to study performance of other types ofsparse factorizations, such as Cholesky or QR.

  3. The Impact of Mobile Learning on ESP Learners' Performance

    Directory of Open Access Journals (Sweden)

    Fahad Alkhezzi

    2016-07-01

    Full Text Available This study explores the impact of using mobile phone applications, namely Telegram Messenger, on teaching and learning English in an ESP context. The main objective is to test whether using mobile phone applications have an impact on ESP learners’ performance by mainly investigating the influence such teaching technique can have on learning vocabulary, and how this can affect the learner's’ ability to use grammar correctly and whether their writing skill is improved. The results showed that using mobile phone applications to teach a foreign language skill or subskill is fruitful and does impact learners’ comprehension of vocabulary and grammatical rules. The results specifically indicate that mobile phones can be used in many different ways to teach and learn technical and semi-technical vocabulary easily outside the classroom, however, to teach grammatical rules and writing it is recommended that certain strategies be used due to certain limitations.

  4. The impact of knowledge management on MNC subsidiary performance

    DEFF Research Database (Denmark)

    Mahnke, Volker; Pedersen, Torben; Venzin, Markus

    2003-01-01

    Empirical studies on the impact of knowledge management on the performance of MNCsubsidiaries remain elusive to date. This study examines the effect of knowledgemanagement tools such as corporate university, communities of practice, groupbenchmarking, learning systems and rewards upon absorptive...... to the current literature on knowledge flows in the MNCinclude an empirically corroborated link between deployments of knowledgemanagement tools and their impact on the subsidiary employee's ability and motivationto learn from internal knowledge flows in the MNC as well as their impact onsubsidiary business...... capacity and performancewith unique data from subsidiary units in a large German MNC - Heidelberger Cement.The findings suggest that knowledge management tools unfold their performanceimpact through their significant influence on absorptive capacity and knowledgeinflows. The key contributions...

  5. Factors that impact interdisciplinary natural science research collaboration in academia

    DEFF Research Database (Denmark)

    Maglaughlin, Kelly L.; Sonnenwald, Diane H.

    2005-01-01

    to provide a more comprehensive understanding of interdisciplinary scientific research collaboration within the natural sciences in academia. Data analysis confirmed factors previously identified in various literatures and yielded new factors. A total of twenty factors were identified, and classified......Interdisciplinary collaboration occurs when people with different educational and research backgrounds bring complementary skills to bear on a problem or task. The strength of interdisciplinary scientific research collaboration is its capacity to bring together diverse scientific knowledge...... to address complex problems and questions. However, interdisciplinary scientific research can be difficult to initiate and sustain. We do not yet fully understand factors that impact interdisciplinary scientific research collaboration. This study synthesizes empirical data from two empirical studies...

  6. Factors that impact interdisciplinary natural science research collaboration in academia

    DEFF Research Database (Denmark)

    Maglaughlin, Kelly L.; Sonnenwald, Diane H.

    2005-01-01

    to provide a more comprehensive understanding of interdisciplinary scientific research collaboration within the natural sciences in academia. Data analysis confirmed factors previously identified in various literatures and yielded new factors. A total of twenty factors were identified, and classified......Interdisciplinary collaboration occurs when people with different educational and research backgrounds bring complementary skills to bear on a problem or task. The strength of interdisciplinary scientific research collaboration is its capacity to bring together diverse scientific knowledge...... to address complex problems and questions. However, interdisciplinary scientific research can be difficult to initiate and sustain. We do not yet fully understand factors that impact interdisciplinary scientific research collaboration. This study synthesizes empirical data from two empirical studies...

  7. IMPACT OF ENVIRONMENTAL FACTORS ON THE EFFICIENCY OF TAX ORGANIZATIONS

    Directory of Open Access Journals (Sweden)

    Marios Tsakas

    2014-05-01

    Full Text Available The study examines the performance of tax organizations in Greece, based on data obtained from a sample of 35 tax offices. Performance evaluation was conducted using DEA with bootstrap methods. In addition, Tobit regression analysis was employed to examine the environmental variables that impact on the efficiency performance of these tax offices. From the analysis, weaknesses, and management issues are derived from the tax offices inefficiency. The general conclusion is that a robust governance structure within the tax office operational framework is needed in order to improve organisational efficiency.

  8. [Acupuncture clinical trials published in high impact factor journals].

    Science.gov (United States)

    Hu, Min; Liu, Jian-Ping; Wu, Xiao-Ke

    2014-12-01

    Acupuncture clinical trials are designed to provide reliable evidence of clinical efficacy, and SCI papers is one of the high-quality clinical efficacy of acupuncture research. To analyze these papers published in high impact factor journals on acupuncture clinical trials, we can study clinical trials from design to implementation, the efficacy of prevention and cure, combined with international standard practices to evaluate the effectiveness and safety of acupuncture. That is the core of acupuncture clinical trials, as well as a prerequisite for outstanding academic output. A scientific and complete acupuncture clinical trial should be topically novel, designed innovative, logically clear, linguistically refining, and the most important point lies in a great discovery and solving the pragmatic problem. All of these are critical points of papers to be published in high impact factor journal, and directly affect international evaluation and promotion of acupuncture.

  9. Cellular & Molecular Immunology receives its first Impact Factor

    Institute of Scientific and Technical Information of China (English)

    Zhigang Tian

    2010-01-01

    @@ The 2009 edition of the JCR, in which Cellular (c) Molecular Immunology (CMI) is listed for the first time, reveals an Impact Factor of 2.765, placing CMI 63rd out of 128 in the Immunology subject category. According to ISI's ranking this also places the journal 5th out of 114 journals published in China and 23rd out of 587 journals published in the Asia-Pacific region. This is an excellent first Impact Factor for a young journal like CMI and,together with our publishing partner Nature Publishing Group and the continued support of our readers and authors, we hope to further build on this into the future. We are delighted that CMI can be internationally recognized as important in the field of immunology.

  10. Factors influencing nursing students' academic and clinical performance and attrition: an integrative literature review.

    Science.gov (United States)

    Pitt, Victoria; Powis, David; Levett-Jones, Tracy; Hunter, Sharyn

    2012-11-01

    Predicted workforce shortages have resulted in government initiatives to increase student numbers in preregistration nursing education. In tandem schools of nursing need to ensure students' progress and complete. The aim of this review was to identify factors that influence preregistration nursing students' academic performance, clinical performance and attrition. An integrative review of both quantitative and qualitative literature was conducted using validated appraisal checklists. The review included studies published from 1999 to 2011 in the databases: MEDLINE, CINAHL, Proquest nursing, Proquest Education (via Proquest 5000), ERIC, Journals@Ovid, PsychINFO and ScienceDirect. Studies were categorised according to their impact on academic progression, clinical progression and attrition. Forty four studies were found; most used quantitative methodologies. The review identified that few studies explored factors that impact on students' clinical performance. The four categories that potentially impact on nursing students' academic performance and attrition were: demographic, academic, cognitive and personality/behavioural factors. The challenge for universities committed to students' success is to develop strategies aimed at addressing these factors that are appropriate to specific contexts and student cohorts.

  11. Weighing the impact (factor) of publishing in veterinary journals

    OpenAIRE

    Christopher, MM

    2015-01-01

    © 2015 Elsevier B.V. The journal in which you publish your research can have a major influence on the perceived value of your work and on your ability to reach certain audiences. The impact factor, a widely used metric of journal quality and prestige, has evolved into a benchmark of quality for institutions and graduate programs and, inappropriately, as a proxy for the quality of individual authors and articles, affecting tenure, promotion, and funding decisions. As a result, despite its many...

  12. The impact of psychosis on social inclusion and factors associated

    OpenAIRE

    Killaspy, H; White, S.; Lalvani, N; Berg, R.; Thachil, A.; Kallumpuram, S.; Nasiruddin, O.; Wright, C.; Mezey, G.

    2014-01-01

    Background: People with mental health problems are known to be socially excluded but the contribution of pre-morbid characteristics, symptoms and needs, and the impact on quality of life is unknown. Aims: To investigate change in social inclusion after the development of a psychotic Illness and factors associated with this. Methods: A cross-sectional community survey of people with psychosis was carried out in three areas of London. Five domains of social inclusion (social integration...

  13. The impact of psychosis on social inclusion and associated factors

    OpenAIRE

    Killaspy, H; White, S.; Lalvani, N; Berg, R.; Thachil, A.; Kallumpuram, S.; Nasiruddin, O.; Wright, C.; Mezey, G.

    2014-01-01

    Background: People with mental health problems are known to be socially excluded but the contribution of pre-morbid characteristics, symptoms and needs, and the impact on quality of life is unknown.\\ud \\ud Aims: To investigate change in social inclusion after the development of a psychotic Illness and factors associated with this.\\ud \\ud Methods: A cross-sectional community survey of people with psychosis was carried out in three areas of London. Five domains of social inclusion (social integ...

  14. Impact of porcine epidemic diarrhea on performance of growing pigs.

    Directory of Open Access Journals (Sweden)

    Julio Alvarez

    Full Text Available The impact of porcine epidemic diarrhea virus (PEDv infection on the US pork industry has mainly been attributed to the mortality that it causes in suckling piglets, and, consequently, much effort has been invested in the quantification of its effect in sow farms. However, no information on the performance of surviving pigs that were exposed to the PEDv as piglets is available. Here, a retrospective cohort study to evaluate the impact of porcine epidemic diarrhea virus (PEDv infection on growing pigs' performance, as indicated by mortality, average daily gain (ADG, average daily feed intake (ADFI, and feed conversion ratio (FCR was performed using production records from weaned pigs in nursery and wean-to-finish sites from sow farms that became PEDv-infected between May 2013 and June 2014. Production records from the first batch of growing pigs weaned in infected flows after the PEDv outbreak ("infected batches" were compared with those from pigs weaned within the previous 14 to 120 days ("control batches". Performance records from infected and control batches, paired by flow, were compared using non-parametric paired tests. Mortality, ADG and FCR were significantly different in PEDv-positive (infected compared with PEDv-negative (control batches, with a mean increase of mortality and FCR of 11% and 0.5, respectively, and a decrease of ADG of 0.16 lb/day. Our results demonstrate a poorer performance of growing pigs weaned after a PEDv outbreak compared with those weaned within the previous 14-120 days, suggesting that in addition to the mortality induced by PEDv in suckling pigs, the disease also impairs the performance of surviving pig. These findings help to quantify the impact of PEDv infection in the US and, ultimately, contribute to efforts to quantify the cost-effectiveness of disease prevention and control measures.

  15. Impact of Emotional Intelligence on Performance of Employees

    OpenAIRE

    Hassan JORFI; Saeid JORFI; Sirous Korahi MOGHADAM

    2010-01-01

    Emotional intelligence is essential factor responsible for determining success in life and psychological wellbeing seems to play an important role in shaping the interaction between managers and employees in their work environment. This study is undertaken to understand the performance level of managers and employees in educational administrations of Iran, the study focuses on understanding the emotional intelligence of the managers and employees and its link to their performance level on the...

  16. Impact of Cooperative-Team Learning on Performance and Retention

    Science.gov (United States)

    1989-09-20

    investigated the impact of goal and resource interdependence on performance and attitudes of ROTC students . The first study involved teaching a class of...were 30 undergraduate university students in a ROTC military history course. The study lasted for four 50 minute class periods in which 20 minutes was...lecture, 20 minutes was groupwork , and 10 minutes was a quiz. Interaction within the cooperative groups was observed daily. An attitude question

  17. The Impact of Motivation on Employees� Performance and Satisfaction

    OpenAIRE

    Angela-Eliza Micu

    2016-01-01

    The Impact of Motivation on Employees� Performance and Satisfaction Abstract:The employees� motivation in the workplace was and still is present for many specialists in from the organizational psychology which continues to explore how we relate to our work and what really motivates us. Although literature offers a wide range of definitions in the process of motivation in the end they all converge on the same content. In everyday language, by reasoning it is understood "the why" for which a...

  18. The impact of knowledge management on MNC subsidiary performance

    DEFF Research Database (Denmark)

    Mahnke, Volker; Pedersen, Torben; Venzin, Markus

    2003-01-01

    Empirical studies on the impact of knowledge management on the performance of MNCsubsidiaries remain elusive to date. This study examines the effect of knowledgemanagement tools such as corporate university, communities of practice, groupbenchmarking, learning systems and rewards upon absorptive...... capacity and performancewith unique data from subsidiary units in a large German MNC - Heidelberger Cement.The findings suggest that knowledge management tools unfold their performanceimpact through their significant influence on absorptive capacity and knowledgeinflows. The key contributions...

  19. Impact of Scheduling Policies on Control System Performance

    DEFF Research Database (Denmark)

    Schiøler, Henrik; Ravn, Anders Peter; Nielsen, Jens Frederik Dalsgaard

    It is well known that jitter has an impact on control system performance, and this is often used as an argument for static scheduling policies, e.g. a time triggered architecture. However, it is only completion jitter that seriously disturbs standard linear control algorithms in a way similar...... to the delay inherent in a time triggered architecture. Thus we propose that standard control algorithms are scheduled dynamically, but without preemption. Analysis of this policy is contrasted with a corresponding time triggered architecture and is shown to have better impulse response performance both...

  20. Guard Ring Width Impact on Impact Parameter Performances and Structure Simulations

    CERN Document Server

    Gouldwell, A; Rahman, M; Bates, R; Wemyss, M; Murphy, G; Turner, P; Biagi, S F

    2003-01-01

    The 1 mm guard ring structure of the VELO sensors has been simulated. The performance of the baseline design is considered and a design which improves the electric field characteristics proposed. Designs which would permit a reduced guard ring width, to 0.5 mm or better, are also discussed and shown to also have similarly good electric field performances. The effect of implementing these designs on the impact parameter resolution of LHCb is found to be better than 5 %. This design is currently being fabricated. Finally, a very different structure, the trench guard ring, is considered which would then allow an impact parameter resolution improvement of approximately 7 %.

  1. Valuing volunteers: the impact of volunteerism on hospital performance.

    Science.gov (United States)

    Hotchkiss, Renee Brent; Fottler, Myron D; Unruh, Lynn

    2009-01-01

    Volunteers have been present in health care settings for centuries. However, there is little empirical evidence regarding the impact that volunteers make on hospital performance. Since the 1990s, hospitals in the United States have had a great deal of pressure to produce high-quality care at minimum expense. These pressures have enhanced the benefits of using volunteers in a hospital setting. This study utilized multiple regression analysis to explore the impact of the use of volunteers and the level of professionalism of volunteer programs on cost effectiveness and patient satisfaction in hospitals. Hospitals throughout the state of Florida were invited to participate in the study by completing a brief questionnaire about their volunteer programs. Performance indicators of volunteer cost savings and patient satisfaction scores for 50 Florida hospitals were analyzed using data sets from the American Hospital Association and Agency for Health Care Administration along with data obtained from a questionnaire. Results indicate that the use of volunteers offers significant cost savings to hospitals and enhances patient satisfaction scores. Larger volunteer programs appear to enhance patient satisfaction while containing costs. Future research opportunities related to the impact of volunteers and volunteer professionalism on other hospital performance measures are suggested.

  2. Impact of Customer Retention Practices on Firm Performance

    Directory of Open Access Journals (Sweden)

    K. Gengeswari

    2013-07-01

    Full Text Available Customer retention has become the buzzword among both practitioners and academics due to its significant impact towards the improvement in firm performance. Though firm performance is normally evaluated using financial measures, this paper has utilized non-financial measure i.e. customer satisfaction. This is due to the appropriateness of its application to measure performance of service-oriented (retail firms. This study was conducted using mall-intercept surveys at AEON Perak, Malaysia whereby, it collected 200 completed questionnaires. Hierarchical regression analysis was employed to examine the impact of customer retention towards firm performance alongside with the demographic profiles as the moderator. Four dimensions of customer retention namely word-of-mouth, price insensitivity, repeat purchase and non-complaining behavior as well as demographic profiles are found to significantly influence firm performance (customer satisfaction. Hence, it is recommended that practitioners should be more considerate towards enriching the said dimensions of customer retention in order to leverage its promising potential.

  3. Investigating the Performance Impact of Newness from a Design Perspective

    DEFF Research Database (Denmark)

    Salomo, Søren; Talke, Katrin; Lutz, Antje

    2008-01-01

    and consumer research, we build an argument for why product innovativeness both from a design and technology perspective may impact sales performance of new products. In order to investigate these effects, we conducted a study based on a sample of 157 new car models launched in the German market between 1978...... and 2006. For measuring both innovativeness dimensions, different data collection methods are combined, such as expert interviews, expert ratings, and document analyses. Responding to recent calls for more objective performance metrics (Sourescu et al., 2003), actual sales data are used as a performance...... measure. The results of our study demonstrate that product innovativeness is a relevant driver of new product performance. Firms in the automotive industry who launch more innovative new products are able to generate higher sales with these products compared to their less innovative competitors...

  4. An analysis of budgetary goals impacting organizational performance

    Directory of Open Access Journals (Sweden)

    Cheok MUI YEE

    2016-05-01

    Full Text Available This study proposes a conceptual review of how budgetary goals impact organizational performance. The aim of this study is to get a better understanding of the direct and indirect relationship between the organization’s decision-making process and operational performances. Setting the budget particularly influences subordinates’ budget goal levels and motivations (i.e., budget goal acceptance and budget goal commitment, which ultimately enhances the organization’s performance. To test these relationships, data were collected using the three perspectives approach: budgetary goal, budgetary participation and budgetary evaluation. The study provided evidence that perception of fairness mediates the relation between the levels of budget participation and goal commitment, whereas goal commitment mediates the relation between fairness perceptions and performance. At the end of the article, there are some implications for SMEs industries and some suggestions for future studies.

  5. Impact of Organizational Inertia and Dynamic Capabilities on Educational Performance of the Charitable Societies and Its Impact on Mathematical Performance of Elementary At-Risk Students

    Directory of Open Access Journals (Sweden)

    Parvaneh Amiripour

    2017-01-01

    Full Text Available This study is an adjunct to a research effort focused on a mathematical curricular innovation in four non-governmental schools in Tehran, Iran. This study queried balanced, random sample of 100 educational personnel from the schools concerning dynamic capabilities associated with change (sensing opportunities, seizing opportunities, and reconfiguring assets and issues surrounding organizational inertia (finding resources, confronting path dependency in change, and establishing new processes. Additional data collected described the personnel’s perceptions about innovations and new processes instituted in their schools. Student performance data from the prior year’s final mathematical examination were also gathered. The data describe a portion of the educational change potential of the schools, including improved student achievement. The variables informed by all of the data were evaluated by multivariate methods. The findings showed that beliefs about dynamic capabilities had a significant positive impact on educational performance and that educational performance had a positive impact on the final mathematical exam scores. The results also indicate that the organizational inertia of the schools had a significant negative impact on the educational performance of the schools. Conclusions were formed based on the analysis of the defining factors of the variables mentioned above and recommendations given for implementing change are proposed.

  6. Impact of Smartphone Addiction on Business Students’ Academic Performance: A Case Study

    Directory of Open Access Journals (Sweden)

    Shamsul Arefin

    2017-09-01

    Full Text Available The development of telecom technology has a profound impact on the lives and activities of the people of the world. Smartphone usage became popular to young generation because of its educational and entertaining options by using the numerous apps. Among the young people, students are increasingly using Smartphone. But excessive Smartphone usage usually makes the students addicted to that subconsciously impacts on user’s academic performance, daily activities, physical and mental health and withdrawal tendency, and social relationships. This study aims at identifying the factors that affect the level of Smartphone addiction of the students and its impact on their academic performance. A structured questionnaire has been developed to gather data from the students. A total of 247 questionnaires were collected from the business students of a university of Bangladesh. Using Structural Equation Modeling (SEM the data were analyzed. Results revealed five Smartphone addiction factors such as, positive anticipation, impatience and tolerance, withdrawal, daily-life disturbance, and cyber friendship. Tolerance and daily-life disturbance have significant impact on students’ academic performance. This study suggests that the students should minimize the usage of Smartphone for achieving good academic performance.

  7. The Impact of Strategic Human Resource Management on Organizational Performance

    Directory of Open Access Journals (Sweden)

    Luftim CANIA

    2014-12-01

    Full Text Available Organizational performance is getting more and more important, especially in a market with greater competition and dynamic. Organizational performance is measured through different indicators. It guarantees the continuity of the organization to be competitive in a global marketplace. Normally, the implementation of performance indicators achieved through human resources. Human resources are the key for keeping the organization in the market so competitive. These human resources need to be managed effectively to achieve the required performance of the organization. It is necessary to manage strategically the human resources and to adapt at its strategy with organizational strategy. The aim of this study is focused on the impact of the strategic management of human resource in achieving organizational performance. This study was conducted based on primary and secondary sources. How much organizations appear competitive in the market through achieving the performance indicators? How important is the management of human resources in achieving organizational performance? So, through the skills, behaviors and attitudes would be expected by human resources to achieve the required performance in the organization.

  8. Delayed onset muscle soreness : treatment strategies and performance factors.

    Science.gov (United States)

    Cheung, Karoline; Hume, Patria; Maxwell, Linda

    2003-01-01

    Delayed onset muscle soreness (DOMS) is a familiar experience for the elite or novice athlete. Symptoms can range from muscle tenderness to severe debilitating pain. The mechanisms, treatment strategies, and impact on athletic performance remain uncertain, despite the high incidence of DOMS. DOMS is most prevalent at the beginning of the sporting season when athletes are returning to training following a period of reduced activity. DOMS is also common when athletes are first introduced to certain types of activities regardless of the time of year. Eccentric activities induce micro-injury at a greater frequency and severity than other types of muscle actions. The intensity and duration of exercise are also important factors in DOMS onset. Up to six hypothesised theories have been proposed for the mechanism of DOMS, namely: lactic acid, muscle spasm, connective tissue damage, muscle damage, inflammation and the enzyme efflux theories. However, an integration of two or more theories is likely to explain muscle soreness. DOMS can affect athletic performance by causing a reduction in joint range of motion, shock attenuation and peak torque. Alterations in muscle sequencing and recruitment patterns may also occur, causing unaccustomed stress to be placed on muscle ligaments and tendons. These compensatory mechanisms may increase the risk of further injury if a premature return to sport is attempted.A number of treatment strategies have been introduced to help alleviate the severity of DOMS and to restore the maximal function of the muscles as rapidly as possible. Nonsteroidal anti-inflammatory drugs have demonstrated dosage-dependent effects that may also be influenced by the time of administration. Similarly, massage has shown varying results that may be attributed to the time of massage application and the type of massage technique used. Cryotherapy, stretching, homeopathy, ultrasound and electrical current modalities have demonstrated no effect on the alleviation of

  9. TQM, managerial factors and performance in the Spanish hotel industry

    OpenAIRE

    Claver Cortés, Enrique; Pereira-Moliner, Jorge; Tarí, Juan-José; Molina-Azorín, José F.

    2007-01-01

    Purpose – Several important managerial factors, such as training, information and communication technologies and information systems (ICT/IS), and environmental management, can be related to total quality management (TQM) in the hotel industry. This paper aims to analyse how TQM is associated with these factors and to verify whether more TQM-committed hotels achieve higher performance. Design/methodology/approach – The empirical data were collected from a sample of 301 three-to-five-star Span...

  10. Calculating impact factor: how bibliographical classification of journal items affects the impact factor of large and small journals.

    Science.gov (United States)

    Golubic, Rajna; Rudes, Mihael; Kovacic, Natasa; Marusic, Matko; Marusic, Ana

    2008-03-01

    As bibliographical classification of published journal items affects the denominator in this equation, we investigated how the numerator and denominator of the impact factor (IF) equation were generated for representative journals in two categories of the Journal Citation Reports (JCR). We performed a full text search of the 1st-ranked journal in 2004 JCR category "Medicine, General and Internal" (New England Journal of Medicine, NEJM, IF = 38.570) and 61st-ranked journal (Croatian Medical Journal, CMJ, IF = 0.690), 1st-ranked journal in category "Multidisciplinary Sciences" (Nature, IF = 32.182) and journal with a relative rank of CMJ (Anais da Academia Brasileira de Ciencias, AABC, IF = 0.435). Large journals published more items categorized by Web of Science (WoS) as non-research items (editorial material, letters, news, book reviews, bibliographical items, or corrections): 63% out of total 5,193 items in Nature and 81% out of 3,540 items in NEJM, compared with 31% out of 283 items in CMJ and only 2 (2%) out of 126 items in AABC. Some items classified by WoS as non-original contained original research data (9.5% in Nature, 7.2% in NEJM, 13.7% in CMJ and none in AABC). These items received a significant number of citations: 6.9% of total citations in Nature, 14.7% in NEJM and 18.5% in CMJ. IF decreased for all journals when only items presenting original research and citations to them were used for IF calculation. Regardless of the journal's size or discipline, publication of non-original research and its classification by the bibliographical database have an effect on both numerator and denominator of the IF equation.

  11. Unraveling the Impact of the Big Five Personality Traits on Academic Performance: The Moderating and Mediating Effects of Self-Efficacy and Academic Motivation

    Science.gov (United States)

    De Feyter, Tim; Caers, Ralf; Vigna, Claudia; Berings, Dries

    2012-01-01

    The main purpose of this study is to unravel the impact of the Big Five personality factors on academic performance. We propose a theoretical model with conditional indirect effects of the Big Five personality factors on academic performance through their impact upon academic motivation. To clarify the mixed results of previous studies concerning…

  12. Impact of obesity on exercise performance and pulmonary rehabilitation.

    Science.gov (United States)

    Dreher, Michael; Kabitz, Hans-Joachim

    2012-08-01

    While the impact of obesity on respiratory function has been extensively studied, and several definitive conclusions have emerged, its impact on exercise performance is complex, with the available data sometimes providing contradictory or inconclusive information. Based on the literature discussed, it appears that resting alterations in lung volumes and gas exchange become attenuated during exercise in the obese, while oxygen cost of breathing and dyspnoea are increased. Respiratory muscle function also seems to be impaired, such that inspiratory muscle strength is reduced and respiratory drive is increased. Furthermore, while there is no reduction in the absolute values of maximal oxygen uptake compared with normal-weight subjects, oxygen uptake at a given workload is increased and maximal workload is reduced in the obese, caused by increases in body mass and/or basal metabolic rate. To date, obesity has not been listed as an indication for pulmonary rehabilitation (PR), hence the reason why conclusive data on the impact of obesity per se on PR are lacking. The majority of evidence discussed is based on comparative data from obese versus normal-weight patients, with respiratory disorders currently established as indications for PR. The best evidence currently available regarding the impact of obesity on PR is for patients with chronic obstructive pulmonary disease (COPD); here, it appears that obesity per se has no negative impact on PR. Otherwise, there are no conclusive data on the impact of obesity on PR in respiratory disorders other than COPD, and this remains to be investigated in the future. © 2012 The Authors. Respirology © 2012 Asian Pacific Society of Respirology.

  13. Population impact of familial and environmental risk factors for schizophrenia

    DEFF Research Database (Denmark)

    Sørensen, Holger Jelling; Nielsen, Philip Finn Rising; Pedersen, Carsten B

    2014-01-01

    Although several studies have examined the relative contributions of familial and environmental risk factors for schizophrenia, few have additionally examined the predictive power on the individual level and simultaneously examined the population impact associated with a wide range of familial...... and environmental risk factors. The authors present rate ratios (IRR), population-attributable risks (PAR) and sex-specific cumulative incidences of the following risk factors: parental history of mental illness, urban place of birth, advanced paternal age, parental loss and immigration status. We established...... a population-based cohort of 2,486,646million persons born in Denmark between 1 January 1955 and 31 December 1993 using Danish registers. We found that PAR associated with urban birth was 11.73%; PAR associated with one, respectively 2, parent(s) with schizophrenia was 2.67% and 0.12%. PAR associated...

  14. The Impact of Soft Factors on Quality Improvement in Manufacturing Industry

    Science.gov (United States)

    Chan, Shiau Wei; Fauzi Ahmad, Md; Kong, Mei Wan

    2017-08-01

    Nowadays, soft factors have become the key factors of success in quality improvement of an organisation. Many organisations have neglected the importance of soft factors, this may influence the organisational performance. Hence, the purpose of this research is to examine the impact of soft factors on quality improvement in manufacturing industries. Six hypotheses were examined while considering six dimensions of soft factors including management commitment, customer focus, supplier relationship, employee involvement, training and education, and reward and recognition that have a positive impact on quality improvement. In this study, eighty one managers from the quality department were randomly selected in the manufacturing industry in Batu Pahat, Johor. The questionnaires were distributed to them. The researcher analysed the quantitatively collected data using descriptive analysis and correlation analysis. The findings of this study revealed that all soft factors are correlated to the quality improvement in an organisation with a high significant value but the regression analysis shows that the supplier relationship and employee involvement has more significant impact on quality improvement as compared to other soft factors which contributes of this study.

  15. Musical expertise has minimal impact on dual task performance.

    Science.gov (United States)

    Cocchini, Gianna; Filardi, Maria Serena; Crhonkova, Marcela; Halpern, Andrea R

    2017-05-01

    Studies investigating effect of practice on dual task performance have yielded conflicting findings, thus supporting different theoretical accounts about the organisation of attentional resources when tasks are performed simultaneously. Because practice has been proven to reduce the demand of attention for the trained task, the impact of long-lasting training on one task is an ideal way to better understand the mechanisms underlying dual task decline in performance. Our study compared performance during dual task execution in expert musicians compared to controls with little if any musical experience. Participants performed a music recognition task and a visuo-spatial task separately (single task) or simultaneously (dual task). Both groups showed a significant but similar performance decline during dual tasks. In addition, the two groups showed a similar decline of dual task performance during encoding and retrieval of the musical information, mainly attributed to a decline in sensitivity. Our results suggest that attention during dual tasks is similarly distributed by expert and non-experts. These findings are in line with previous studies showing a lack of sensitivity to difficulty and lack of practice effect during dual tasks, supporting the idea that different tasks may rely on different and not-sharable attentional resources.

  16. Factors Affecting Green Supply Chain Operational Performance of the Thai Auto Parts Industry

    Directory of Open Access Journals (Sweden)

    Korrakot Yaibuathet Tippayawong

    2016-11-01

    Full Text Available In this work, operational performance in the green supply chain management (SCM of the Thai auto parts industry was investigated. A green supply chain performance measurement (GSPM model was developed from the combination of various concepts including an SCM logistics scorecard, a supply chain operations reference model, a balance scorecard, and green supply chain management. The GSPM has been designed for use as a self-evaluation tool focusing on five decisive areas, or factors, and 28 sub-factors. A factor analysis was conducted using the survey results of the GSPM in order to identify significant factors that represent the green supply chain operation performance. Grouped as three major factors, namely green procurement, green transportation, and green manufacturing; reverse logistics and eco-design; and reuse and recycle of manufacturing, their significance and impact on the auto parts industry in Thailand were highlighted. Specifically, the factor of green procurement, green transportation, and green manufacturing, as major factor 1, in relation with the factor of reverse logistics and eco-design, as major factor 2, were found to have a strong positive relationship with the asset turnover ratio.

  17. The impact of environmental factors in severe psychiatric disorders

    Directory of Open Access Journals (Sweden)

    Andrea eSchmitt

    2014-02-01

    Full Text Available During the last decades, schizophrenia has been regarded as a developmental disorder. The neurodevelopmental hypothesis proposes schizophrenia to be related to genetic and environmental factors leading to abnormal brain development during the pre- or postnatal period. First disease symptoms appear in early adulthood during the synaptic pruning and myelination process. Meta-analyses of structural MRI studies revealing hippocampal volume deficits in first-episode patients and in the longitudinal disease course confirm this hypothesis. Apart from the influence of risk genes in severe psychiatric disorders, environmental factors may also impact brain development during the perinatal period. Several environmental factors such as antenatal maternal virus infections, obstetric complications entailing hypoxia as common factor or stress during neurodevelopment have been identified to play a role in schizophrenia and bipolar disorder, possibly contributing to smaller hippocampal volumes. In major depression, psychosocial stress during the perinatal period or in adulthood is an important trigger. In animal studies, chronic stress or repeated administration of glucocorticoids have been shown to induce degeneration of glucocorticoid-sensitive hippocampal neurons and may contribute to the pathophysiology of affective disorders. Epigenetic mechanisms altering the chromatin structure such as histone acetylation and DNA methylation may mediate effects of environmental factors to transcriptional regulation of specific genes and be a prominent factor in gene-environmental interaction. In animal models, gene-environmental interaction should be investigated more intensely to unravel pathophysiological mechanisms. These findings may lead to new therapeutic strategies influencing epigenetic targets in severe psychiatric disorders.

  18. Impact of some field factors on inhalation exposure levels to bitumen emissions during road paving operations.

    Science.gov (United States)

    Deygout, François; Auburtin, Guy

    2015-03-01

    Variability in occupational exposure levels to bitumen emissions has been observed during road paving operations. This is due to recurrent field factors impacting the level of exposure experienced by workers during paving. The present study was undertaken in order to quantify the impact of such factors. Pre-identified variables currently encountered in the field were monitored and recorded during paving surveys, and were conducted randomly covering current applications performed by road crews. Multivariate variance analysis and regressions were then used on computerized field data. The statistical investigations were limited due to the relatively small size of the study (36 data). Nevertheless, the particular use of the step-wise regression tool enabled the quantification of the impact of several predictors despite the existing collinearity between variables. The two bitumen organic fractions (particulates and volatiles) are associated with different field factors. The process conditions (machinery used and delivery temperature) have a significant impact on the production of airborne particulates and explain up to 44% of variability. This confirms the outcomes described by previous studies. The influence of the production factors is limited though, and should be complemented by studying factors involving the worker such as work style and the mix of tasks. The residual volatile compounds, being part of the bituminous binder and released during paving operations, control the volatile emissions; 73% of the encountered field variability is explained by the composition of the bitumen batch.

  19. Impact of obstructive sleep apnea on cognitive performance

    Directory of Open Access Journals (Sweden)

    Felipe Cunha Bawden

    2011-08-01

    Full Text Available OBJECTIVE: To evaluate the impact of obstructive sleep apnea (OSA on cognition. METHOD: We compared the performance of 17 patients with polysomnographic diagnosis of OSA in brief cognitive tests to that of 20 healthy controls, matched for age and education. The testing battery included the Mini-Mental State Examination (MMSE, Brief Cognitive Screening Battery (BCSB, Digit-Symbol (DS and Phonemic Verbal Fluency (FAS. Anthropometric measures and scores from the Epworth Sleepiness Scale were also recorded. RESULTS: OSA patients performed significantly worse than controls in the MMSE, in memory items from the BCSB, in DS and also in FAS. OSA patients also exhibited higher body mass index, increased neck circumference and higher scores in Epworth Sleepiness Scale than controls. CONCLUSION: OSA significantly impairs cognitive performance, especially within the domains of attention, memory and executive functioning. These deficits may be detected by brief and easy-to-administer cognitive tests.

  20. ON THE IMPACT OF INFORMATION ASYMMETRY ON EVALUATION AND RISK OF CLUSTER PERFORMANCE

    Directory of Open Access Journals (Sweden)

    Laura Gudelytė

    2015-12-01

    Full Text Available This article aims to determine and analyse the main approaches of evaluation of cluster or group performance under information asymmetry within cluster. It is assumed that one of the most relevant causes of information asymmetry inside the business clusters are the different interests of its stakeholders and their willingness to dominate. This paper contributes to the further analysis, development and generalisation of evaluation approach of cluster performance and of the impact of information asymmetry on the activities of business clusters. Purpose – is to investigate the impact of information asymmetry on the evaluation on performance of business clusters and the methods and approaches of evaluation of performance with regard to information asymmetry. Design/methodology/approach – general overview of research papers presenting concepts and methodologies of evaluation of performance with regard to information asymmetry. Findings – information asymmetry has a significant impact on the performance of business clusters, and can be the decisive factor in the viability of a cluster. The members of cluster can be seem as subjects willing to dominate in cluster and to gain a relatively more portion of profit of clusters, some conflicts of interests can appear. However, there is no universal approach for evaluation of the impact of information asymmetry on cluster or group efficiency. This paper aims to highlight the main types of information asymmetry and respective approaches of evaluation analysed by the researchers.Research limitations/implications – the complexity and nature of information that can be used in the process of creation of innovation. The strong assumptions on information asymmetry from one side and the lack of advanced investigation focussed on the evaluation of business clusters performance efficiency under information asymmetry from other side are the most relevant limitations of research. Therefore the conclusions are

  1. Relationship between organizational factors and performance among pay-for-performance hospitals.

    Science.gov (United States)

    Vina, Ernest R; Rhew, David C; Weingarten, Scott R; Weingarten, Jason B; Chang, John T

    2009-07-01

    The Centers for Medicare & Medicaid Services (CMS)/Premier Hospital Quality Incentive Demonstration (HQID) project aims to improve clinical performance through a pay-for-performance program. We conducted this study to identify the key organizational factors associated with higher performance. An investigator-blinded, structured telephone survey of eligible hospitals' (N = 92) quality improvement (QI) leaders was conducted among HQID hospitals in the top 2 or bottom 2 deciles submitting performance measure data from October 2004 to September 2005. The survey covered topics such as QI interventions, data feedback, physician leadership, support for QI efforts, and organizational culture. More top performing hospitals used clinical pathways for the treatment of AMI (49% vs. 15%, p organizational culture that supported coordination of care (p change (p Organizational structure, support, and culture are associated with high performance among hospitals participating in a pay-for-performance demonstration project. Multiple organizational factors remain important in optimizing clinical care.

  2. The Impact of Competitive Trait Anxiety on Collegiate Powerlifting Performance.

    Science.gov (United States)

    Judge, Lawrence W; Urbina, Leslie J; Hoover, Donald L; Craig, Bruce W; Judge, Lani M; Leitzelar, Brianna M; Pearson, David R; Holtzclaw, Kara A; Bellar, David M

    2016-09-01

    Judge, LW, Urbina, LJ, Hoover, DL, Craig, BW, Judge, LM, Leitzelar, BM, Pearson, DR, Holtzclaw, KA, and Bellar, DM. The impact of competitive trait anxiety on collegiate powerlifting performance. J Strength Cond Res 30(9): 2399-2405, 2016-The purpose of this study was to determine the relationship between competitive trait anxiety measures and powerlifting (PL) performance. Thirty-six collegiate powerlifters on club teams from 3 universities were recruited during a competition (men = 26, women = 10; age = 19.9 ± 1.5 years; height = 172.5 ± 8.6 cm; weight = 81.4 ± 21.0 kg). The athletes were distributed across weight classes for collegiate PL (47.6 kg: 1; 51.7 kg: 1; 54.9 kg: 1; 59.8 kg: 3; 67.1 kg: 2; 74.8 kg: 7; 82.1 kg: 4; 89.8 kg: 9; 99.8 kg: 5; super heavyweight: 3). A survey containing questions about PL performance history and the 15-item Sport Competition Anxiety Test (SCAT) were administered to the participants before competing. The SCAT total was negatively correlated (r = -0.397; p = 0.02) to the athletes' percentage of best total achieved in the competition (actual performance total/best comp total × 100). Of the individual lifts, the SCAT score was negatively correlated to the personal best for bench press (r = -0.368; p = 0.03) and deadlift (r = -0.317, p = 0.05), but did not significantly correlate for squat (r = -0.182, p = 0.27). These results indicate a negative correlation between the SCAT score and athletes' personal best totals in PL. Increased SCAT scores were associated with decreased personal best PL totals. The results suggest that competitive trait anxiety may have negatively impacted performance and that some PL athletes may benefit from interventions aimed at decreasing anxiety before and during performance.

  3. Firm-specific factors and financial performance of firms in the Czech Republic

    Directory of Open Access Journals (Sweden)

    Pathirawasam Chandrapala

    2013-01-01

    Full Text Available The objective of this study is to investigate the role of internal factors in generating financial performance of firms in the Czech Republic. The paper examines the impact of firm specific factors on company financial performance of 974 firms in the Czech Republic over the period 2005 to 2008, using data in the Albertina database. Pooled and panel cross-sectional time series techniques are used for the data analysis. Return on Assets (ROA is the dependent variable of the model and eight firm specific factors are introduced as the explanatory variables. Using Return on Assets as the dependent variable, it is established that the firm size, sales growth and capital turnover are having significant positive impact on financial performance of firms. At the same time, debt ratio and inventory reflect significant negative impact on financial performance of firms. Overall explanatory powers of the two models are low and further research is necessary to increase the statistical power of the model. The results from the present study may be very encouraging and useful for managers as well as investors to plan investment and operational activities to achieve profitability objectives more efficiently and effectively. The findings have important managerial implications.

  4. Factors impacting teachers' argumentation instruction in their science classrooms

    Science.gov (United States)

    McNeill, Katherine L.; Katsh-Singer, Rebecca; González-Howard, María; Loper, Suzanna

    2016-08-01

    Science education research, reform documents and standards include scientific argumentation as a key learning goal for students. The role of the teacher is essential for implementing argumentation in part because their beliefs about argumentation can impact whether and how this science practice is integrated into their classroom. In this study, we surveyed 42 middle school science teachers and conducted follow-up interviews with 25 to investigate the factors that teachers believe impact their argumentation instruction. Teachers responded that their own learning goals had the greatest impact on their argumentation instruction while influences related to context, policy and assessment had the least impact. The minor influence of policy and assessment was in part because teachers saw a lack of alignment between these areas and the goals of argumentation. In addition, although teachers indicated that argumentation was an important learning goal, regardless of students' backgrounds and abilities, the teachers discussed argumentation in different ways. Consequently, it may be more important to help teachers understand what counts as argumentation, rather than provide a rationale for including argumentation in instruction. Finally, the act of trying out argumentation in their own classrooms, supported through resources such as curriculum, can increase teachers' confidence in teaching argumentation.

  5. BASEL III IMPACT ON ROMANIAN BANKING SYSTEM PERFORMANCE

    Directory of Open Access Journals (Sweden)

    Mariana G. NEDELCU (BUNEA

    2014-04-01

    Full Text Available In the context of economic and financial crisis triggered in EU by autumn 2008, Romania's banking system like that in the other European countries, faced with the consequences of decreasing the standard of living the worsening of purchasing power (in terms of retail and with gaps and Delay occurred in the payment of corporate clients. However the deteriorating the quality of bank investments, increasing non-performing loans in bank portfolios totate ultimately causing the accumulation of excessive risks that banks were exposed. On the background of the crisis, the impact of Basel III is not only a financial regulation that is applicable to the banking industry and will fundamentally determine the profitability of the banking system. Through this study, we propose a series of measures applicable to the credit institutions to mitigate the impact of alignment with the new capital requirements.

  6. BASEL III IMPACT ON ROMANIAN BANKING SYSTEM PERFORMANCE

    Directory of Open Access Journals (Sweden)

    Mariana G. NEDELCU (BUNEA

    2014-04-01

    Full Text Available In the context of economic and financial crisis triggered in EU by autumn 2008, Romania's banking system like that in the other European countries, faced with the consequences of decreasing the standard of living the worsening of purchasing power (in terms of retail and with gaps and Delay occurred in the payment of corporate clients. However the deteriorating the quality of bank investments, increasing non-performing loans in bank portfolios totate ultimately causing the accumulation of excessive risks that banks were exposed. On the background of the crisis, the impact of Basel III is not only a financial regulation that is applicable to the banking industry and will fundamentally determine the profitability of the banking system. Through this study, we propose a series of measures applicable to the credit institutions to mitigate the impact of alignment with the new capital requirements.

  7. Performance Evaluation of Pressure Transducers for Water Impacts

    Science.gov (United States)

    Vassilakos, Gregory J.; Stegall, David E.; Treadway, Sean

    2012-01-01

    The Orion Multi-Purpose Crew Vehicle is being designed for water landings. In order to benchmark the ability of engineering tools to predict water landing loads, test programs are underway for scale model and full-scale water impacts. These test programs are predicated on the reliable measurement of impact pressure histories. Tests have been performed with a variety of pressure transducers from various manufacturers. Both piezoelectric and piezoresistive devices have been tested. Effects such as thermal shock, pinching of the transducer head, and flushness of the transducer mounting have been studied. Data acquisition issues such as sampling rate and anti-aliasing filtering also have been studied. The response of pressure transducers have been compared side-by-side on an impulse test rig and on a 20-inch diameter hemisphere dropped into a pool of water. The results have identified a range of viable configurations for pressure measurement dependent on the objectives of the test program.

  8. L’IMPLANTATION DE L’ERP : FACTEURS CLES DU SUCCES ET IMPACTE SUR LA PERFORMANCE

    OpenAIRE

    Dumitru Valentin; Florescu Vasile

    2008-01-01

    The implantation of an ERP (abbreviation for "Enterprise Resource Planning") system is an enterprise project that implies the remodeling of the information system, mostly the rethinking of management procedures within the organization. The expansion and the complexity of these projects demand a theoretical framework and « optimal practices » in order to model and to evaluate the key factors of implementation success and to analyze its impact on the organization’s performance. The research pro...

  9. 教师因素、学生因素对学生学业成绩影响的实证研究——基于大规模测验数据的多层线性模型分析%A Empirical Study on the Impact of Teacher' s and Student' s Factors to Their Academic Performance ~-Based on A Multi -Linear Analysis to A Large Scale Test Data

    Institute of Scientific and Technical Information of China (English)

    张咏梅; 郝懿; 李美娟

    2012-01-01

    This study examines the impact of the teacher' s and student' factors to their academic performance, based on an analysis to the test data from Beijing large scale 0ssessment in compulsory education. The teacher's factor includes their personal background and working styles, while student' s factor includes of their personal background and learning styles. Through a multilevel analysis, it found that: 1 ) Students' performance shows significant difference among classes ; 2) For the teacher's background factor, their gender, years of teaching, and knowledge background have significantly impact on the students' performance, while their educational level and academic title show no impact; 3 ) For the teacher' s working style factor, whether or not teaching different subject has significant impact on the student' s performance, while their week- ly instruction hours shows no impact; 4) For the student' s background factors, gender and single child or not show signifi- cant influence on their performance, while local or non - local identification has no influence; 5 ) For student' s learning style factor, their self education expectation, learning habit, homework completion, reading, and extracurricular study, all have significant impact on their learning, while hours for homework shows no influence.%运用北京市义务教育阶段三年级学生大规模学业测验数据,对影响学生学业成绩的教师因素、学生因素进行分析。多层线性模型分析结果表明:学生学业成绩具有显著的班级间差异。来自于教师背景因素的教师性别、教龄和专业一致化程度,教师工作因素中的教师是否兼教等对班级学业成绩产生显著影响;来自于学生背景因素的学生性别、独生与否,学生学习因素中的学生自我教育期待、学习习惯、完成作业方式、课外阅读量、课外学习情况等对学生学业成绩产生显著影响。

  10. Motivation factors affecting employees job performance in selected ...

    African Journals Online (AJOL)

    Journal Home > Vol 10, No 2 (2011) > ... companies; and determine motivating factors affecting employees' job performance in selected oil ... promotion ( x = 4.86), random sack of workers ( x = 4.40) and absence of staff training ( x = 4.07).

  11. Key factors for successful export performance for small firms

    NARCIS (Netherlands)

    Brouthers, L.E.; Nakos, G.; Hadjimarcou, J.; Brouthers, K.D.

    2009-01-01

    What key factors result in superior export performance for small firms from small countries? Drawing on the internationalization process model and organizational learning theory, the authors hypothesize and find that (1) emphasizing international sales while (2) restricting exports to a few foreign

  12. Factor- Analytic Study of Performance on the Bender-Gestalt

    Science.gov (United States)

    Haynes, Jack R.

    1970-01-01

    College students were given the 16 Personality Factor Questionnaire, the Guilford Zimmerman Spatial Orientation and Spatial Visualization Tests, and the Bender Gestalt. Analyses revealed that personality characteristics were related to Bender performance and that the Bender was not measuring a unitary dimension of behavior. (Author)

  13. Principals' Perception regarding Factors Affecting the Performance of Teachers

    Science.gov (United States)

    Akram, Muhammad Javaid; Raza, Syed Ahmad; Khaleeq, Abdur Rehman; Atika, Samrana

    2011-01-01

    This study investigated the perception of principals on how the factors of subject mastery, teaching methodology, personal characteristics, and attitude toward students affect the performance of teachers at higher secondary level in the Punjab. All principals of higher secondary level in the Punjab were part of the population of the study. From…

  14. Factors for Radical Creativity, Incremental Creativity, and Routine, Noncreative Performance

    Science.gov (United States)

    Madjar, Nora; Greenberg, Ellen; Chen, Zheng

    2011-01-01

    This study extends theory and research by differentiating between routine, noncreative performance and 2 distinct types of creativity: radical and incremental. We also use a sensemaking perspective to examine the interplay of social and personal factors that may influence a person's engagement in a certain level of creative action versus routine,…

  15. Weight Perception, Academic Performance, and Psychological Factors in Chinese Adolescents

    Science.gov (United States)

    Xie, Bin; Chou, Chih-Ping; Spruijt-Metz, Donna; Reynolds, Kim; Clark, Florence; Palmer, Paula H.; Gallaher, Peggy; Sun, Ping; Guo, Qian; Johnson, C. Anderson

    2006-01-01

    Objective: To investigate weight perception and related psychological factors in Chinese adolescents. Methods: A questionnaire on weight perception, academic performance, stress, hostility, and depression was completed by 6863 middle and high school students. Weight and height were measured. Results: Overweight perception was related to…

  16. Factors Affecting Performance in an Introductory Sociology Course

    Science.gov (United States)

    Kwenda, Maxwell

    2011-01-01

    This study examines factors affecting students' performances in an Introductory Sociology course over five semesters. Employing simple and ordered logit regression models, the author explains final grades by focusing on individual demographic and educational characteristics that students bring into the classroom. The results show that a student's…

  17. Identifying influential factors of business process performance using dependency analysis

    Science.gov (United States)

    Wetzstein, Branimir; Leitner, Philipp; Rosenberg, Florian; Dustdar, Schahram; Leymann, Frank

    2011-02-01

    We present a comprehensive framework for identifying influential factors of business process performance. In particular, our approach combines monitoring of process events and Quality of Service (QoS) measurements with dependency analysis to effectively identify influential factors. The framework uses data mining techniques to construct tree structures to represent dependencies of a key performance indicator (KPI) on process and QoS metrics. These dependency trees allow business analysts to determine how process KPIs depend on lower-level process metrics and QoS characteristics of the IT infrastructure. The structure of the dependencies enables a drill-down analysis of single factors of influence to gain a deeper knowledge why certain KPI targets are not met.

  18. Quality factor concept in piezoceramic transformer performance description.

    Science.gov (United States)

    Mezheritsky, Alex V

    2006-02-01

    A new general approach based on the quality factor concept to piezoceramic transformer (PT) performance description is proposed. The system's quality factor, material elastic anisotropy, and coupling factors of the input and output sections of an electrically excited and electrically loaded PT fully characterize its resonance and near-resonance behavior. The PT efficiency, transformation ratio, and input and output power were analytically analyzed and simulated as functions of the load and frequency for the simplest classical Langevin-type and Rosen-type PT designs. A new formulation of the electrical input impedance allows one to separate the power consumed by PT from the power transferred into the load. The system's PT quality factor takes into account losses in each PT "input-output-load" functional components. The loading process is changing PT input electrical impedance on the way that under loading the minimum series impedance is increasing and the maximum parallel impedance is decreasing coincidentally. The quality-factors ratio, between the states of fully loaded and nonloaded PT, is one of the best measures of PTs dynamic performance--practically, the lower the ratio is, the better PT efficiency. A simple and effective method for the loaded PT quality factor determination is proposed. As was found, a piezoceramic with low piezoelectric anisotropy is required to provide maximum PT efficiency and higher corresponding voltage gain. Limitations on the PT output voltage and power, caused by nonlinear effects in piezoceramics, were established.

  19. Impact of Educational Level on Performance on Auditory Processing Tests.

    Science.gov (United States)

    Murphy, Cristina F B; Rabelo, Camila M; Silagi, Marcela L; Mansur, Letícia L; Schochat, Eliane

    2016-01-01

    Research has demonstrated that a higher level of education is associated with better performance on cognitive tests among middle-aged and elderly people. However, the effects of education on auditory processing skills have not yet been evaluated. Previous demonstrations of sensory-cognitive interactions in the aging process indicate the potential importance of this topic. Therefore, the primary purpose of this study was to investigate the performance of middle-aged and elderly people with different levels of formal education on auditory processing tests. A total of 177 adults with no evidence of cognitive, psychological or neurological conditions took part in the research. The participants completed a series of auditory assessments, including dichotic digit, frequency pattern and speech-in-noise tests. A working memory test was also performed to investigate the extent to which auditory processing and cognitive performance were associated. The results demonstrated positive but weak correlations between years of schooling and performance on all of the tests applied. The factor "years of schooling" was also one of the best predictors of frequency pattern and speech-in-noise test performance. Additionally, performance on the working memory, frequency pattern and dichotic digit tests was also correlated, suggesting that the influence of educational level on auditory processing performance might be associated with the cognitive demand of the auditory processing tests rather than auditory sensory aspects itself. Longitudinal research is required to investigate the causal relationship between educational level and auditory processing skills.

  20. Addressing forecast uncertainty impact on CSP annual performance

    Science.gov (United States)

    Ferretti, Fabio; Hogendijk, Christopher; Aga, Vipluv; Ehrsam, Andreas

    2017-06-01

    This work analyzes the impact of weather forecast uncertainty on the annual performance of a Concentrated Solar Power (CSP) plant. Forecast time series has been produced by a commercial forecast provider using the technique of hindcasting for the full year 2011 in hourly resolution for Ouarzazate, Morocco. Impact of forecast uncertainty has been measured on three case studies, representing typical tariff schemes observed in recent CSP projects plus a spot market price scenario. The analysis has been carried out using an annual performance model and a standard dispatch optimization algorithm based on dynamic programming. The dispatch optimizer has been demonstrated to be a key requisite to maximize the annual revenues depending on the price scenario, harvesting the maximum potential out of the CSP plant. Forecasting uncertainty affects the revenue enhancement outcome of a dispatch optimizer depending on the error level and the price function. Results show that forecasting accuracy of direct solar irradiance (DNI) is important to make best use of an optimized dispatch but also that a higher number of calculation updates can partially compensate this uncertainty. Improvement in revenues can be significant depending on the price profile and the optimal operation strategy. Pathways to achieve better performance are presented by having more updates both by repeatedly generating new optimized trajectories but also more often updating weather forecasts. This study shows the importance of working on DNI weather forecasting for revenue enhancement as well as selecting weather services that can provide multiple updates a day and probabilistic forecast information.

  1. On the choice of performance assessment criteria and their impact on the overall system performance

    DEFF Research Database (Denmark)

    Niemann, Hans Henrik; Green, Torben

    2010-01-01

    The aim of this paper is to illuminate the impact of the choice of a system’s performance criteria on the quality of the corresponding monitoring system’s assessment results. Special attention is given to the performance issues that are caused by or can be solved by control actions. The compressor...... capacity gap issue in the supermarket refrigeration systems is used as a case study to elaborate on the problem through employment of both real life field data as well as simulation data. A performance function that can capture the compressor capacity gap problem is presented in the paper and used...

  2. Factors affecting the performance of undergraduate medical students: A perspective

    Directory of Open Access Journals (Sweden)

    Ananya Mandal

    2012-01-01

    Full Text Available Context: Performance of medical students in developing nations like India is perceived to have largely declined. Aims: We attempted to assess the reasons behind such trends. Settings and Design: Students in their third year of medical study were given a predesigned, pretested structured and validated questionnaire that they filled in anonymously. The key areas assessed were concentration, interest and understanding of the subject and other perceived causes of poor performance. Tests for descriptive statistics were applied for evaluation. Results and Conclusions: One hundred and fifty students participated in the study. Fifty-five (36.66% students performed poorly. Male gender, inability to clear the previous professional examination at the first attempt, difficulty in understanding medium of instruction, self-assessed depression, sleep disorders and perceived parental and peer pressure and dissatisfaction with career choice were significantly linked with poor performance (P<0.05 for each factor. Socioeconomic status and regularity in class were not linked to academic performance.

  3. Psychologic stress related to injury and impact on sport performance.

    Science.gov (United States)

    Nippert, Angela H; Smith, Aynsley M

    2008-05-01

    Injury rates are high among children and adolescent athletes. Psychosocial stressors, such as personality, history of stressors, and life event stress can influence injury occurrence. After injury, those same factors plus athletic identity, self-esteem, and significant others-such as parents, coaches, and teammates-can affect injury response, recovery and subsequent sport performance. Goal setting, positive self-talk, attribution theory, and relaxation or mental imagery are psychologic interventions that can help injured athletes cope with psychosocial stressors. Medical professionals should be aware of the potential influence that psychosocial stressors and psychologic interventions can have on injury occurrence, injury recovery, and sport performance.

  4. REVERSIBLE IMPAIRMENT OF ASSETS AND THE IMPACT ON ECONOMIC PERFORMANCE

    Directory of Open Access Journals (Sweden)

    MIRON VASILE-CRISTIAN-IOACHIM

    2015-03-01

    Full Text Available Economic performance is an essential objective of economic entities activating in the energy sector. The profit and loss account provides relevant information for performance analyzes, but evaluating the factors which determined the modification of the financial result demands detailed analyzes based on specific techniques. This paper develops and implements an econometric model that analyses the relation between gross profit and the reversible impairment of assets. The results of the analysis have shown that, in the energy sector, there is a significant connection between those two variables.

  5. The Enhancing Impact of Friendship Networks on Sales Managers’ Performance

    Directory of Open Access Journals (Sweden)

    Danny Pimentel Claro

    2013-04-01

    Full Text Available This paper examines how relationships with friends moderate the impact of professional networks on sales performance. Based on a sample of 204 sales managers in a professional service company, this study presents evidence that friendship networks amplify the effect of sales forces’ professional networks on new product sales as well as on prospecting and converting new deals. Our results offer important insights into the socio-cognitive perspective of sales management literature and suggest that firms should encourage managers to improve their friendships in order to access valuable information that will enhance customer knowledge and support their sales efforts.

  6. Soil erosion on vineyards: impacts on vine performances

    Science.gov (United States)

    Degan, Francesca; Salvador-Banes, Sébastien; Cerdan, Olivier; Goulet, Etienne; Le Duc, Lionel

    2014-05-01

    Many agricultural practices increase soil degradation processes. The measurement of the effects of such practices helps for the management of constraints and ensures the stability of agricultural production. In viticulture, soil is one of the components that define the specificity and quality of wine. Chemical and physical soil properties indeed exert a strong influence on vine performances. However, the precise influences of soil properties, such as rock fragments, clay or lime contents, soil depth or mineral content are subjected to debate. Actually, vine performances derive also from climate and vintage, viticulture and winemaking techniques and plant genetic. Nerveless, soil erosion can significantly change the root growing zone properties and therefore the vine responses. In fact viticulture is the agricultural production that is the most prone to erosion, with an average rate of 12 t.ha -1.yr-1 in the European context (Cerdan et al., 2010). The soil's capacities to support crop growth, without resulting in soil degradation, need to be brought under control, to improve environmental sustainability and minimize in-site and off-site impacts. The aim of this study is to better quantify the effect of soil erosion in vineyards on soil parameters (such as available water content) that exert a key role in the specificity of viticultural terroirs. Two study areas are considered in Corsica and in the Loire Valley. Our approach is divided into three steps. Firstly, the identification and the mapping of soil properties that have an impact over vine performances, using digital soil mapping techniques and pedotransfer functions. The soil characteristics are identified by field survey at two spatial resolutions: the field and landscape. In the same study areas, the erosion dynamics is assessed. Various techniques are employed such as: 137Cs activities, spatial distribution of copper and stock unearthing. In order to comprehend erosion dynamics and evolutions, the third step

  7. Multi-factor climate change effects on insect herbivore performance

    DEFF Research Database (Denmark)

    Scherber, Christoph; Gladbach, David J; Stevnbak, Karen;

    2013-01-01

    The impact of climate change on herbivorous insects can have far-reaching consequences for ecosystem processes. However, experiments investigating the combined effects of multiple climate change drivers on herbivorous insects are scarce. We independently manipulated three climate change drivers (CO......, and water content. Overall, drought was the most important factor for this insect herbivore. Our study shows that weight and survival of insect herbivores may decline under future climate. The complexity of insect herbivore responses increases with the number of combined climate change drivers....

  8. Multi-factor climate change effects on insect herbivore performance

    DEFF Research Database (Denmark)

    Scherber, Christoph; Gladbach, David J; Stevnbak, Karen

    2013-01-01

    the drought treatment, and there was a three-way interaction between time, CO2, and drought. Survival was lowest when drought, warming, and elevated CO2 were combined. Effects of climate change drivers depended on other co-acting factors and were mediated by changes in plant secondary compounds, nitrogen......The impact of climate change on herbivorous insects can have far-reaching consequences for ecosystem processes. However, experiments investigating the combined effects of multiple climate change drivers on herbivorous insects are scarce. We independently manipulated three climate change drivers (CO...

  9. Impact of Polyphenol Antioxidants on Cycling Performance and Cardiovascular Function

    Science.gov (United States)

    Trinity, Joel D.; Pahnke, Matthew D.; Trombold, Justin R.; Coyle, Edward F.

    2014-01-01

    This investigation sought to determine if supplementation with polyphenol antioxidant (PA) improves exercise performance in the heat (31.5 °C, 55% RH) by altering the cardiovascular and thermoregulatory responses to exercise. Twelve endurance trained athletes ingested PA or placebo (PLAC) for 7 days. Consecutive days of exercise testing were performed at the end of the supplementation periods. Cardiovascular and thermoregulatory measures were made during exercise. Performance, as measured by a 10 min time trial (TT) following 50 min of moderate intensity cycling, was not different between treatments (PLAC: 292 ± 33 W and PA: 279 ± 38 W, p = 0.12). Gross efficiency, blood lactate, maximal neuromuscular power, and ratings of perceived exertion were also not different between treatments. Similarly, performance on the second day of testing, as assessed by time to fatigue at maximal oxygen consumption, was not different between treatments (PLAC; 377 ± 117 s vs. PA; 364 ± 128 s, p = 0.61). Cardiovascular and thermoregulatory responses to exercise were not different between treatments on either day of exercise testing. Polyphenol antioxidant supplementation had no impact on exercise performance and did not alter the cardiovascular or thermoregulatory responses to exercise in the heat. PMID:24667134

  10. Impact of Polyphenol Antioxidants on Cycling Performance and Cardiovascular Function

    Directory of Open Access Journals (Sweden)

    Joel D. Trinity

    2014-03-01

    Full Text Available This investigation sought to determine if supplementation with polyphenol antioxidant (PA improves exercise performance in the heat (31.5 °C, 55% RH by altering the cardiovascular and thermoregulatory responses to exercise. Twelve endurance trained athletes ingested PA or placebo (PLAC for 7 days. Consecutive days of exercise testing were performed at the end of the supplementation periods. Cardiovascular and thermoregulatory measures were made during exercise. Performance, as measured by a 10 min time trial (TT following 50 min of moderate intensity cycling, was not different between treatments (PLAC: 292 ± 33 W and PA: 279 ± 38 W, p = 0.12. Gross efficiency, blood lactate, maximal neuromuscular power, and ratings of perceived exertion were also not different between treatments. Similarly, performance on the second day of testing, as assessed by time to fatigue at maximal oxygen consumption, was not different between treatments (PLAC; 377 ± 117 s vs. PA; 364 ± 128 s, p = 0.61. Cardiovascular and thermoregulatory responses to exercise were not different between treatments on either day of exercise testing. Polyphenol antioxidant supplementation had no impact on exercise performance and did not alter the cardiovascular or thermoregulatory responses to exercise in the heat.

  11. Impact of Anthropogenic Factor on Urboecological Space Development

    Directory of Open Access Journals (Sweden)

    Kuprina Tamara

    2016-01-01

    Full Text Available The article discusses the issues of the impact of the anthropogenic factor on urboecological space development. The issues are considered taking into account retrospective theoretical data to show the process of Anthropoecology development as a new branch of sociological science. At present the noosphere acquires features of anthropoecosystems having a number of parameters from the endogenous and exogenous point of view. Anthropoecology has special socio-cultural significance as considers the interaction of all actors of international space. There introduced the new branch Ecopsycology as the outer world is the reflection of the inner human world. There is a definition of the sustainability of ecological system. In the practical part of the article there is an example of academic mobility as the basis of the human potential with possible transfer into the human capital supporting by survey data. In conclusion there are recommendations on management and adaptation of the anthropogenic factor (a kind of biogenesis in modern urboecological space.

  12. Impact and risk factors of post-stroke bone fracture.

    Science.gov (United States)

    Huo, Kang; Hashim, Syed I; Yong, Kimberley L Y; Su, Hua; Qu, Qiu-Min

    2016-02-20

    Bone fracture occurs in stroke patients at different times during the recovery phase, prolonging recovery time and increasing medical costs. In this review, we discuss the potential risk factors for post-stroke bone fracture and preventive methods. Most post-stroke bone fractures occur in the lower extremities, indicating fragile bones are a risk factor. Motor changes, including posture, mobility, and balance post-stroke contribute to bone loss and thus increase risk of bone fracture. Bone mineral density is a useful indicator for bone resorption, useful to identify patients at risk of post-stroke bone fracture. Calcium supplementation was previously regarded as a useful treatment during physical rehabilitation. However, recent data suggests calcium supplementation has a negative impact on atherosclerotic conditions. Vitamin D intake may prevent osteoporosis and fractures in patients with stroke. Although drugs such as teriparatide show some benefits in preventing osteoporosis, additional clinical trials are needed to determine the most effective conditions for post-stroke applications.

  13. Factors Affecting Sustainable Performance of Construction Projects during Project Life Cycle Phases

    Directory of Open Access Journals (Sweden)

    Adnan Enshassi

    2016-03-01

    Full Text Available Sustainable development (SD is one of the main challenges faced by the construction industry, which has acquired global attention. Sustainable performance (SP of a construction project during its life cycle (LC is considered crucial to achieve the SD. The aim of this paper is to investigate the factors affecting sustainable performance of construction projects throughout project life cycle phases in the Gaza Strip. A total of 53 sustainable factors (economic, social, and environmental sustainable factors were identified through extensive literature review and confirmed by experts’ interviews and a pilot study. These factors are classified in relation to the project life cycle phases; inception phase, design phase, construction phase, operation phase, and demolition phase. A structured questionnaire survey is employed in this study for primary data collection. A total of 119 questionnaires were distributed randomly to engineers working in construction projects in the Gaza Strip to solicit their views regarding the factors affecting sustainable performance of construction projects throughout project life cycle phases. The results revealed that five factors among the top ten factors that impacting the sustainable performance of construction projects are classified under the construction phase, which confirmed that the construction process has the most effect on the projects SP. Three factors are classified under the inception phase, which assured that the inception of a potential project has a considerable effect projects. In addition, one factor was classified under operation phase and one factor was classified under demolition phase. The most common factors affecting the SP of construction project through the overall sustainability elements: reusable/recyclable element, provision of services, energy consumption, water cost, and water pollution assessment. Further studies are recommended to explore how to integrated sustainability concepts into

  14. The Impacts of Rising Temperatures on Aircraft Takeoff Performance

    Science.gov (United States)

    Coffel, Ethan; Thompson, Terence R.; Horton, Radley M.

    2017-01-01

    Steadily rising mean and extreme temperatures as a result of climate change will likely impact the air transportation system over the coming decades. As air temperatures rise at constant pressure, air density declines, resulting in less lift generation by an aircraft wing at a given airspeed and potentially imposing a weight restriction on departing aircraft. This study presents a general model to project future weight restrictions across a fleet of aircraft with different takeoff weights operating at a variety of airports. We construct performance models for five common commercial aircraft and 19 major airports around the world and use projections of daily temperatures from the CMIP5 model suite under the RCP 4.5 and RCP 8.5 emissions scenarios to calculate required hourly weight restriction. We find that on average, 10 - 30% of annual flights departing at the time of daily maximum temperature may require some weight restriction below their maximum takeoff weights, with mean restrictions ranging from 0.5 to 4% of total aircraft payload and fuel capacity by mid- to late century. Both mid-sized and large aircraft are affected, and airports with short runways and high temperatures, or those at high elevations, will see the largest impacts. Our results suggest that weight restriction may impose a non-trivial cost on airlines and impact aviation operations around the world and that adaptation may be required in aircraft design, airline schedules, and/or runway lengths.

  15. Performance of a New Fine Particle Impact Damper

    Directory of Open Access Journals (Sweden)

    Guangqiang Han

    2008-09-01

    Full Text Available The energy dissipation mechanisms of conventional impact damper (CID are mainly momentum exchange and friction. During the impact process, a lot of vibration energy cannot be exhausted but reverberated among the vibration partners. Besides, the CID may produce the additional vibration to the system or even amplify the response in the low-frequency vibration. To overcome these shortcomings, this paper proposes a new fine particle impact damper (FPID which for the first time introduces the fine particle plastic deformation as an irreversible energy sink. Then, the experiments of the cantilevered beam with the CID and that with the FPID are, respectively, carried out to investigate the behavior of FPID. The experimental results indicate that the FPID has a better performance in vibration damping than in the CID and the FPID works well in control of the vibration with frequency lower than 50 Hz, which is absent to the non-obstructive particle damper. Thus, the FPID has a bright and significant application future because most of the mechanical vibration falls in the range of low freqency.

  16. The impact of Chernobyl on health and labour market performance.

    Science.gov (United States)

    Lehmann, Hartmut; Wadsworth, Jonathan

    2011-09-01

    Using longitudinal data from Ukraine we examine the extent of any long-lasting effects of exposure to the Chernobyl disaster on the health and labour market performance of the adult workforce. Variation in the local area level of radiation fallout from the Chernobyl accident is considered as a random exogenous shock with which to try to establish its causal impact on poor health, labour force participation, hours worked and wages. There appears to be a significant positive association between local area-level radiation dosage and perception of poor health, though much weaker associations between local area-level dosage and other specific self-reported health conditions. There is also some evidence to suggest that those who lived in areas more exposed to Chernobyl-induced radiation have significantly lower levels of labour market performance 20 years on. Copyright © 2011 Elsevier B.V. All rights reserved.

  17. Impact of Wake Dispersion on Axial Compressor Performance

    Science.gov (United States)

    Hah, Chunill

    2017-01-01

    Detailed development of wakes and their impact on the performance of a low-speed one and half stage axial compressor are investigated with a large eddy simulation (LES). To investigate effects of wake mixing recovery and wake interaction with the boundary layer of the downstream blade, spacing between the rotor blade and the stator is varied. The calculated LES flow fields based on a fine computational grid are compared with related measurements and analyzed in detail at several radial locations. The current LES calculates the effects of wake recovery very well. The effects of wake recovery vary significantly in the radial direction. Loss generation is higher on the pressure side at the stator exit at both near design and near stall condition. The current investigation indicates that better management of wake development can be achieved for improved compressor performance.

  18. Impact of Scheduling Policies on Control System Performance

    DEFF Research Database (Denmark)

    Schiøler, Henrik; Ravn, Anders Peter; Nielsen, Jens Frederik Dalsgaard

    2003-01-01

    It is well known that jitter has an impact on control system performance, and this is often used as an argument for static scheduling policies, e.g. a time triggered architecture. However, it is only completion jitter that seriously disturbs standard linear control algorithms in a way similar...... to the delay inherent in a time triggered architecture. Thus we propose that standard control algorithms are scheduled dynamically, but without preemption. Analysis of this policy is contrasted with a corresponding time triggered architecture and is shown to have better impulse response performance both...... in the deterministic case and under white noise disturbances. The conclusion is that under very reasonable assumptions about robustness of control algorithms,they are insensitive to relase jitter, albeit strongly sensitive to completion jitter, thus priority based scheduling without preemption is may be preferable...

  19. A Large-Scale Analysis of Impact Factor Biased Journal Self-Citations.

    Science.gov (United States)

    Chorus, Caspar; Waltman, Ludo

    2016-01-01

    Based on three decades of citation data from across scientific fields of science, we study trends in impact factor biased self-citations of scholarly journals, using a purpose-built and easy to use citation based measure. Our measure is given by the ratio between i) the relative share of journal self-citations to papers published in the last two years, and ii) the relative share of journal self-citations to papers published in preceding years. A ratio higher than one suggests that a journal's impact factor is disproportionally affected (inflated) by self-citations. Using recently reported survey data, we show that there is a relation between high values of our proposed measure and coercive journal self-citation malpractices. We use our measure to perform a large-scale analysis of impact factor biased journal self-citations. Our main empirical result is, that the share of journals for which our measure has a (very) high value has remained stable between the 1980s and the early 2000s, but has since risen strongly in all fields of science. This time span corresponds well with the growing obsession with the impact factor as a journal evaluation measure over the last decade. Taken together, this suggests a trend of increasingly pervasive journal self-citation malpractices, with all due unwanted consequences such as inflated perceived importance of journals and biased journal rankings.

  20. The Impact of Corporate Sustainability Strategies on the Financial Performance of Romanian Companies in the Context of Green Marketing

    Directory of Open Access Journals (Sweden)

    Marian Siminică

    2015-08-01

    Full Text Available The current research paper aims at making a comprehensive analysis of the current green marketing initiatives adopted by the top performing Romanian companies, in order to understand the determinant factors that influence their green approach and to evaluate the impact of the sustainability strategies implemented on their financial performance. The research of business sustainability strategies in 31 top performing companies in Romania is conducted by analyzing their green marketing initiatives, the ability to communicate online current and past Corporate Sustainability (CS actions (substantive action and their future commitments towards green marketing (symbolic action. The authors also analyzed the impact of companies’ dimensions on their green performance and commitment, substantiating that the size of a company is a significant influential factor. The analysis of the impact of substantive and symbolic action on the financial performance of the companies shows that there is not a significant correlation between these indicators.

  1. Agility in Team Sports: Testing, Training and Factors Affecting Performance.

    Science.gov (United States)

    Paul, Darren J; Gabbett, Tim J; Nassis, George P

    2016-03-01

    Agility is an important characteristic of team sports athletes. There is a growing interest in the factors that influence agility performance as well as appropriate testing protocols and training strategies to assess and improve this quality. The objective of this systematic review was to (1) evaluate the reliability and validity of agility tests in team sports, (2) detail factors that may influence agility performance, and (3) identify the effects of different interventions on agility performance. The review was undertaken in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. We conducted a search of PubMed, Google Scholar, Science Direct, and SPORTDiscus databases. We assessed the methodological quality of intervention studies using a customized checklist of assessment criteria. Intraclass correlation coefficient values were 0.80-0.91, 0.10-0.81, and 0.81-0.99 for test time using light, video, and human stimuli. A low-level reliability was reported for youth athletes using the video stimulus (0.10-0.30). Higher-level participants were shown to be, on average, 7.5% faster than their lower level counterparts. Reaction time and accuracy, foot placement, and in-line lunge movement have been shown to be related to agility performance. The contribution of strength remains unclear. Efficacy of interventions on agility performance ranged from 1% (vibration training) to 7.5% (small-sided games training). Agility tests generally offer good reliability, although this may be compromised in younger participants responding to various scenarios. A human and/or video stimulus seems the most appropriate method to discriminate between standard of playing ability. Decision-making and perceptual factors are often propositioned as discriminant factors; however, the underlying mechanisms are relatively unknown. Research has focused predominantly on the physical element of agility. Small-sided games and video training may offer effective

  2. Ergonomic factors on task performance in laparoscopic surgery training.

    Science.gov (United States)

    Xiao, D J; Jakimowicz, Jack J; Albayrak, A; Goossens, R H M

    2012-05-01

    This paper evaluates the effect of ergonomic factors on task performance and trainee posture during laparoscopic surgery training. Twenty subjects without laparoscopic experience were allotted into 2 groups. Group 1 was trained under the optimal ergonomic simulation setting according to current ergonomic guidelines (Condition A). Group 2 was trained under non-optimal ergonomic simulation setting that can often be observed during training in a skills lab (Condition B). Posture analysis showed that the subjects held a much more neutral posture under Condition A than under Condition B (poptimal ergonomic simulation setting leads to better task performance. In addition, no significant differences of task performance, for Groups 1 and 2 using the same test setting were found. However, better performance was observed for Group 1. It can be concluded that the optimal and non-optimal training setting have different learning effects on trainees' skill learning.

  3. Impact of Environmental Factors on Legionella Populations in Drinking Water

    Directory of Open Access Journals (Sweden)

    David Otto Schwake

    2015-05-01

    Full Text Available To examine the impact of environmental factors on Legionella in drinking water distribution systems, the growth and survival of Legionella under various conditions was studied. When incubated in tap water at 4 °C, 25 °C, and 32 °C, L. pneumophila survival trends varied amongst the temperatures, with the stable populations maintained for months at 25 °C and 32 °C demonstrating that survival is possible at these temperatures for extended periods in oligotrophic conditions. After inoculating coupons of PVC, copper, brass, and cast iron, L. pneumophila colonized biofilms formed on each within days to a similar extent, with the exception of cast iron, which contained 1-log less Legionella after 90 days. L. pneumophila spiked in a model drinking water distribution system colonized the system within days. Chlorination of the system had a greater effect on biofilm-associated Legionella concentrations, with populations returning to pre-chlorination levels within six weeks. Biofilms sampled from drinking water meters collected from two areas within central Arizona were analyzed via PCR for the presence of Legionella. Occurrence in only one area indicates that environmental differences in water distribution systems may have an impact on the survival of Legionella. These results document the impact of different environmental conditions on the survival of Legionella in water.

  4. The top-ten in journal impact factor manipulation.

    Science.gov (United States)

    Falagas, Matthew E; Alexiou, Vangelis G

    2008-01-01

    A considerable part of the scientific community is, at least to some degree, involved in the "impact factor game". Editors strive to increase their journals' impact factor (IF) in order to gain influence in the fields of basic and applied research and scientists seek to profit from the "added value" of publishing in top IF journals. In this article we point out the most common "tricks" of engineering and manipulating the IF undertaken by a portion of professionals of the scientific publishing industry. They attempt to increase the nominator or decrease the denominator of the IF equation by taking advantage of certain design flaws and disadvantages of the IF that permit a degree of artificial and arbitrary inflation. Some of these practices, if not scientifically unethical, are at least questionable and should be abandoned. Editors and publishers should strive for quality through fair and thoughtful selection of papers forwarded for peer review and editorial comments that enhance the quality and scientific accuracy of a manuscript.

  5. Impact factors and publication times for plastic surgery journals.

    Science.gov (United States)

    Labanaris, Apostolos P; Vassiliadu, Agapi P; Polykandriotis, Elias; Tjiawi, Jimmy; Arkudas, Andreas; Horch, Raymund E

    2007-12-01

    The purposes of the authors' analysis were to assess the values that plastic surgical journals demonstrate in terms of the standardized measures created by the Institute for Scientific Information's Journal Citation Report, and to assess the relationship between these values and the turnaround time of these journals. The overall indexes of surgical journals were compared with those of journals in other fields of medicine using the following parameters: highest impact factor, average impact factor, cited half-life, immediacy index, and number of journals. Similarly, plastic surgery journals were compared with the highest ranking journals from various fields of surgery. In addition, an evaluation of all original articles published in 2005, assessing the time intervals from submission to publication, submission to acceptance, and acceptance to publication, was conducted for all plastic surgical journals and the highest ranking journals from various surgical fields listed in the Journal Citation Report. Plastic surgical journals demonstrated low overall index values and a greater elongation of their turnaround time in comparison to journals in other fields of surgery and medicine. The fact that the field of plastic surgery targets a rather specific and limited medical audience, and that plastic surgical articles usually get quoted by this audience, partly explains these values. Furthermore, the elongated turnaround time contributes to their endurance. Since plastic surgical journals cannot attract a broader medical audience, journals should speed up their publication times to help these values rise.

  6. Factors influencing wastewater management performance: case study of housing estates in suburban Bangkok, Thailand.

    Science.gov (United States)

    Sujaritpong, Sarunya; Nitivattananon, Vilas

    2009-01-01

    As population densities have risen and settlements become increasingly crowded, wastewater effluent volumes have, not unexpectedly, also risen. The adverse impacts of effluent from housing estates (HEs) in suburban areas of Thailand, served by local wastewater management (WWM) systems, are of particular concern. Because of this problem, which reflects the poor performance of WWM systems, it has become increasingly important that the pivotal factors that hinder WWM improvements be identified and effective solutions be proposed and implemented. The goal of the research described in this paper was to determine the critical factors influencing WWM performance at HEs in suburban Bangkok, using multiple regression analysis. Three significant factors encompassing financial, social, institutional and general aspects were identified for each type of WWM system (community centralized and onsite). For the community centralized system, the key factors were house price, type of organization managing the HE, and the attitudes of the organization. For onsite systems, the three factors were total number of house units, direct experience with water pollution and percentage of occupied houses. These findings reflect the importance of having a WWM that employs an integrated approach rather than focusing on specific aspects in isolation from other factors. WWM performance could be improved if significant factors indicating high priority concerns were to be identified and properly applied. Addressing the priority concerns could, consequently, contribute to the development of appropriate environmental management measures, plans, and policies related to HE WWM.

  7. Prioritizing the Factor Weights Affecting Tourism Performance by FAHP

    Directory of Open Access Journals (Sweden)

    Quang Hung Do

    2013-10-01

    determine the relative weights of the factors and subfactors in contributing to tourism performance. An application case related to the Vietnamese context is used to illustrate the proposed framework. The results of this study consolidated the tourism theory and suggested recommendations and solutions for the Vietnamese tourism industry. The proposed framework could be used by a group of decision-makers to achieve a consensus, as well as deal with uncertainty in the decision-making process. The findings of the study may serve as a tool for assistance for planners in improving the efficiency of tourism performance.

  8. Factors on Storage Performance of MH-Ni Battery

    Institute of Scientific and Technical Information of China (English)

    Zhang Zhong; Jia Chunming; Xing Zhiqiang; Li Li; Ma Yijun

    2004-01-01

    The open voltage of batteries shows different status after MH-Ni batteries are stored for a period of time.Some batteries with 0, 0.9 ~ 1.1V and above 1.1 V were chosen to study their corresponding internal resistances, open voltages and the reduction of capacities, etc.On the basis of battery reaction principle, battery samples were analyzed,and factors causing different storage performance were found out.Therefore, some references on the improvement of battery storage performance were provided.

  9. The Journal Impact Factor is under attack - use the CAPCI factor instead.

    Science.gov (United States)

    Diamandis, Eleftherios P

    2017-01-16

    The uses and misuses of the Journal Impact Factor (JIF) have been thoroughly discussed in the literature. A few years ago, I predicted that JIF would soon be replaced, while another colleague argued the opposite. Over the past few months, attacks on JIF have intensified, with some publishing organizations gradually removing the indicator from their journals' websites. Here, I argue that most, if not all of the misuses of JIF are related to its name. The word "impact" should be removed, since it implies an influential attribute, either for the journals, their published papers, or their authors. I propose instead the use of a new name, the "CAPCI factor", standing for Citation Average Per Citable Item, which accurately describes what is represented by this measure.

  10. The introduction of the 5-year impact factor : does it benefit statistics journals?

    NARCIS (Netherlands)

    van Nierop, Erjen

    2010-01-01

    In this paper, we investigate the effects of the introduction of 5-year impact factors. We collect impact factor data for all disciplines available in the Journal Citation Reports. For all these categories, we give insights into the relationship between the traditional 2-year impact factor and the n

  11. Impacts of Corporate Governance on Firm Performance: Turkey Case with a Panel Data Analysis

    Directory of Open Access Journals (Sweden)

    Cahit Yilmaz

    2016-01-01

    Full Text Available There has been increasing attention all over the world on corporate governance issues after experiencing some financial crises and corporation scandals. It is assumed that the investors search for emerging economies to diversify their investment portfolios and maximize their returns is considering corporate governance applications. Investors are also concerned about governance factors to minimize their risks. In this study, we examine the impact of corporate governance variables on firms’ financial performance in Turkey. The relationship between ownership structures, board structures and financial performances are tested. Influence of corporate governance variables, board size, share of independent board members, foreign investors, leverage ratio on firms’ financial performance “return on assets” are utilized on firms traded in Turkey’s stock exchange BIST 100. This research concludes that corporate governance variables influence firms’ performances. Shares of independent board members and leverage have negative influences while foreign ownership has a positive influence on firms’ financial performances.

  12. Computational Fluid Dynamics Analysis of Butterfly Valve Performance Factors

    OpenAIRE

    Del Toro, Adam

    2012-01-01

    Butterfly valves are commonly used in industrial applications to control the internal flow of both compressible and incompressible fluids. A butterfly valve typically consists of a metal disc formed around a central shaft, which acts as its axis of rotation. As the valve's opening angle is increased from 0 degrees (fully closed) to 90 degrees (fully open), fluid is able to more readily flow past the valve. Characterizing a valve's performance factors, such as pressure drop, hydrodynamic torqu...

  13. Influential Factors on Deicing Performance of Electrically Conductive Concrete Pavement

    Institute of Scientific and Technical Information of China (English)

    TANG Zuquan; QIAN Jueshi; LI Zhuoqiu; WU Chuanming

    2006-01-01

    The deicing experiment of carbon fiber reinforced electrically conductive concrete (CFRC) slab was conducted in laboratory at first, then the deicing process of CFRC pavement was analyzed by means of finite element method (FEM). At last, based on the energy conservation law and the computing results of finite element method, the influential factors including the setting of electric heating layer, environmental temperature, the thickness of ice, material parameters, and deicing power on deicing performance and energy consumption were discussed.

  14. Development and application of spaceflight performance shaping factors for human reliability analysis

    Science.gov (United States)

    Mindock, Jennifer

    The ability of crewmembers to perform various critical functions during spacecraft operations is widely recognized as being essential to mission success. This necessity motivates the desire to better characterize factors that can influence crewmember performance so that those with positive effects can be enhanced, while those with negative impacts can be minimized. Established Human Reliability Analysis methods exist for analyzing performance within the context of myriad terrestrial scenarios. Many of the existing methods have their roots in nuclear power plant operations. While perhaps similar, the factors influencing performance traditionally used in these methods do not take into account the unique conditions encountered during spaceflight. Therefore, this research has identified a tailored set of factors that influence human task performance during space missions. This thesis describes an organizational scheme developed to aid in classifying and communicating the factors across disciplines and organizations. Definitions of identified factors are given for the spaceflight-specific context. A visual display of the factors, called the Contributing Factor Map, is presented and its use as a risk communication tool is discussed. The Bayesian Network is discussed as a quantification approach allowing relationships between factors, in addition to the factor relationships to performance outcomes, to be modeled. A method for determining a network structure was developed for domains such as human spaceflight, in which a global set of data for analysis is not available. This method applied the Analytic Hierarchy Process, and causal latency concepts from the Human Factors Analysis and Classification System in a novel way to guide choices for modeling the dominant set of factors and relationships in a simplified Bayesian Network structure. In addition, an approach for modeling the factors as statistical variables in a Bayesian Network making use of existing design

  15. Temporary Losses of Highway Capacity and Impacts on Performance

    Energy Technology Data Exchange (ETDEWEB)

    Chin, S.M.

    2002-07-31

    Traffic congestion and its impacts significantly affect the nation's economic performance and the public's quality of life. In most urban areas, travel demand routinely exceeds highway capacity during peak periods. In addition, events such as crashes, vehicle breakdowns, work zones, adverse weather, and suboptimal signal timing cause temporary capacity losses, often worsening the conditions on already congested highway networks. The impacts of these temporary capacity losses include delay, reduced mobility, and reduced reliability of the highway system. They can also cause drivers to re-route or reschedule trips. Prior to this study, no nationwide estimates of temporary losses of highway capacity had been made by type of capacity-reducing event. Such information is vital to formulating sound public policies for the highway infrastructure and its operation. This study is an initial attempt to provide nationwide estimates of the capacity losses and delay caused by temporary capacity-reducing events. The objective of this study was to develop and implement methods for producing national-level estimates of the loss of capacity on the nation's highway facilities due to temporary phenomena as well as estimates of the impacts of such losses. The estimates produced by this study roughly indicate the magnitude of problems that are likely be addressed by the Congress during the next re-authorization of the Surface Transportation Programs. The scope of the study includes all urban and rural freeways and principal arterials in the nation's highway system for 1999. Specifically, this study attempts to quantify the extent of temporary capacity losses due to crashes, breakdowns, work zones, weather, and sub-optimal signal timing. These events can cause impacts such as capacity reduction, delays, trip rescheduling, rerouting, reduced mobility, and reduced reliability. This study focuses on the reduction of capacity and resulting delays caused by the temporary

  16. The impact of environmental factors on traffic accidents in Iran.

    Science.gov (United States)

    Lankarani, Kamran B; Heydari, Seyed Taghi; Aghabeigi, Mohammad Reza; Moafian, Ghasem; Hoseinzadeh, Amin; Vossoughi, Mehrdad

    2014-07-01

    Road traffic crashes are the third highest cause of mortality in Iran. The aim of this study was to determine the impact of roadway environmental factors on traffic crash. This cross-sectional study was conducted in Iran between March 21, 2010 and December 30, 2010. The data on road traffic crashes were obtained from the Traffic Police Department records. These records were classified to control for the main confounders related to the type of crash and roadway environmental factors. Roadway environmental factors included crash scene light, weather, place of accident, the defects and geometrics of roadway and road surface. The study included 542,863 traffic crashes. The proportions of road traffic crash which led to injury were 24.44% at sunrise and 27.16% at sunset compared with 5.43% and 1.43% deaths at sunrise and sunset respectively. In regard to day time accidents, the proportions were 20.50% injuries and 0.55% deaths. The statistical analysis of the results showed that the ratio of injuries and deaths were significantly higher at sunrise and sunset than those occurring during daytime (P less than 0.001). The highest rate of death (5.07%) was due to dusty weather compared to 5.07% for other weather conditions (P less than 0.001). The highest mortality rate (3.45%) occurred on oily surfaces (P less than 0.001). The defective traffic signs were responsible for 30,046 injuries and 5.58% deaths, and road narrowing accounted for 22,775 injuries and, 4.23% deaths which indicated that the roadway defects inflict most frequent injuries and deaths. The lowest (0.74 %) and highest (3.09%) proportion of traffic crash- related deaths were due to flat straight and winding uphill/downhill roads respectively (P less than 0.001). Sunrise, sunset, dusty weather, oily road surfaces and winding uphill/downhill road were hazardous environmental factors. This study provides an insight into the potential impacts of environmental factors on road traffic accidents and underlines the

  17. Measuring the impact of HRM on organizational performance

    Directory of Open Access Journals (Sweden)

    Anastasia A. Katou

    2008-12-01

    Full Text Available Normal 0 21 false false false ES ZH-CN X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman","serif"; mso-ansi-language:ES-TRAD; mso-fareast-language:EN-US;} The purpose of this paper is to measure the impact of HRM on organisational performance in the context of Greece. Data were collected from 178 organisations using a questionnaire survey in the Greek manufacturing sector, and analysed using the ‘structural equation modelling’ methodology. The results indicated that the relationship between HRM policies (resourcing and development, compensation and incentives, involvement and job design and organisational performance is partially mediated through HRM outcomes (skills, attitudes, behaviour, and it is influenced by business strategies (cost, quality, innovation. Thus, the contribution of this study for academics and practitioners is that HRM policies associated with business strategies will affect organisational performance through HRM outcomes.

  18. Factors influencing obstacle crossing performance in patients with Parkinson's disease.

    Directory of Open Access Journals (Sweden)

    Ying-Yi Liao

    Full Text Available BACKGROUND: Tripping over obstacles is the major cause of falls in community-dwelling patients with Parkinson's disease (PD. Understanding the factors associated with the obstacle crossing behavior may help to develop possible training programs for crossing performance. This study aimed to identify the relationships and important factors determining obstacle crossing performance in patients with PD. METHODS: Forty-two idiopathic patients with PD (Hoehn and Yahr stages I to III participated in this study. Obstacle crossing performance was recorded by the Liberty system, a three-dimensional motion capture device. Maximal isometric strength of the lower extremity was measured by a handheld dynamometer. Dynamic balance and sensory integration ability were assessed using the Balance Master system. Movement velocity (MV, maximal excursion (ME, and directional control (DC were obtained during the limits of stability test to quantify dynamic balance. The sum of sensory organization test (SOT scores was used to quantify sensory organization ability. RESULTS: Both crossing stride length and stride velocity correlated significantly with lower extremity muscle strength, dynamic balance control (forward and sideward, and sum of SOT scores. From the regression model, forward DC and ankle dorsiflexor strength were identified as two major determinants for crossing performance (R(2 = .37 to.41 for the crossing stride length, R(2 = .43 to.44 for the crossing stride velocity. CONCLUSIONS: Lower extremity muscle strength, dynamic balance control and sensory integration ability significantly influence obstacle crossing performance. We suggest an emphasis on muscle strengthening exercises (especially ankle dorsiflexors, balance training (especially forward DC, and sensory integration training to improve obstacle crossing performance in patients with PD.

  19. A Vision Training Program's Impact on Ice Hockey Performance

    Directory of Open Access Journals (Sweden)

    Alison Jenerou, OD

    2015-04-01

    Full Text Available Background: This study was carried out to determine whether a preseason vision training program would improve visual skills and season success in a Division I men’s ice hockey team. Methods: A six-week vision training program was implemented with the Ferris State University Men’s Ice Hockey team during their pre-season workouts. Vision training incorporated binocular and accommodative training along with dynamic visual skills training. Results: The study showed an improvement in base out vergence ranges, binocular accommodative facility, and Wayne Saccadic Fixator (WSF scores and was viewed by players to have made a positive impact on their individual performance. The pre- and post vision training goals, shots on goal, and shooting percentage all significantly improved following training. Conclusion: The vision training program during preseason workouts had a positive impact on the players’ visual skills important for hockey. The players’ perception of their vision and how they were using their vision during competitive play also showed a significant change. The majority of the players felt that vision training was an effective use of their practice time allotted by the NCAA.

  20. Impact of target modifications on Magnetized Liner Inertial Fusion performance

    Science.gov (United States)

    Gomez, Matthew; Knapp, Patrick; Sefkow, Adam; Slutz, Stephen; Awe, Thomas; Hansen, Stephanie; Hahn, Kelly; Harding, Eric; Jennings, Christopher; McBride, Ryan; Sinars, Daniel; Rochau, Gregory; Peterson, Kyle

    2015-11-01

    Magnetized Liner Inertial Fusion (MagLIF) is a magnetically-driven fusion concept in which an axial magnetic field and laser heating are used to relax the implosion requirements of inertial confinement fusion. Initial experiments demonstrated the promise of the concept with relatively high yields (primary DD = 2e12), ion temperatures (2.5 keV), and magnetic field-radius products (>0.3 MG-cm). In order to better understand the portions of parameter space in which MagLIF can operate effectively, a series of experiments are being conducted to test the impact of various changes (e.g., laser-entrance-hole window thickness, imploding height of the target, endcap material, laser energy, laser spot size, initial fuel density). The impact of these changes on target performance (primary neutron yield, ion temperature, stagnation volume, etc.) will be discussed. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under Contract No. DE-AC04-94AL85000.

  1. The story of fake impact factor companies and how we detected them.

    Science.gov (United States)

    Jalalian, Mehrdad

    2015-01-01

    Beginning about three years ago, the world of academic publishing has become infected by fake impact factors and misleading metrics that are launched by bogus companies. The misleading metrics and fake impact factors have damaged the prestige and reliability of scientific research and scholarly journals. This article presents the in-depth story of some of the main bogus impact factors, how they approached the academic world, and how the author identified them. Some names that they use are Universal Impact Factor (UIF), Global Impact Factor (GIF), and Citefactor, and there even is a fake Thomson Reuters Company.

  2. Investigating the Performance Impact of Newness from a Design Perspective

    DEFF Research Database (Denmark)

    Salomo, Søren; Talke, Katrin; Lutz, Antje

    2008-01-01

    Product innovativeness is regarded as a critical construct in new product development research (e.g., Avlonitis et al., 2001; Danneels and Kleinschmidt, 2001). Several researchers have focused on the issue of conceptualizing and measuring innovativeness (e.g., Green et al., 1995). However, product...... innovativeness is very rarely assessed from a design perspective. This fact is surprising, especially when considering that in many markets new products are very similar in technological features, but compete on the product design (Veryzer, 1995). Drawing from different literature streams, such as design...... and consumer research, we build an argument for why product innovativeness both from a design and technology perspective may impact sales performance of new products. In order to investigate these effects, we conducted a study based on a sample of 157 new car models launched in the German market between 1978...

  3. Transient analysis techniques in performing impact and crash dynamic studies

    Science.gov (United States)

    Pifko, A. B.; Winter, R.

    1989-01-01

    Because of the emphasis being placed on crashworthiness as a design requirement, increasing demands are being made by various organizations to analyze a wide range of complex structures that must perform safely when subjected to severe impact loads, such as those generated in a crash event. The ultimate goal of crashworthiness design and analysis is to produce vehicles with the ability to reduce the dynamic forces experienced by the occupants to specified levels, while maintaining a survivable envelope around them during a specified crash event. DYCAST is a nonlinear structural dynamic finite element computer code that started from the plans systems of a finite element program for static nonlinear structural analysis. The essential features of DYCAST are outlined.

  4. Impact of reactor water chemistry on cladding performance

    Energy Technology Data Exchange (ETDEWEB)

    Cox, B. [University of Toronto, Centre for Nuclear Engineering, Toronto, Ontario (Canada)

    1997-07-01

    Water chemistry may have a major impact on fuel cladding performance in PWRs. If the saturation temperature on the surface of fuel cladding is exceeded, either because of the thermal hydraulics of the system, or because of crud deposition, then LiOH concentration can occur within thick porous oxide films on the cladding. This can degrade the protective film and accelerate the corrosion rate of the cladding. If sufficient boric acid is also present in the coolant then these effects may be mitigated. This is normally the case through most of any reactor fuel cycle. Extensive surface boiling may disrupt this equilibrium because of the volatility of boric acid in steam. Under such conditions severe cladding corrosion can ensue. The potential for such effects on high burnup cladding in CANDU reactors, where bone acid is not present in the primary coolant, is discussed. (author)

  5. Current Approaches Regarding the Knowledge Management Impact on SMEs Performance

    Directory of Open Access Journals (Sweden)

    Ionela Carmen RIZEA (PIRNEA

    2011-12-01

    Full Text Available Managing knowledge is a critical capability for small to medium-sized enterprises (SMEs to master because it helps them leverage their most critical resource. Organizational knowledge is the most salient resource at the disposal of SMEs in terms of availability, access, and depth. Successful SMEs are those who can leverage their knowledge in an effective and efficient manner, so as to make up for deficiencies in traditional resources, like land, labor, and capital. The purpose of this article is to identify the knowledge management impact on SMEs performance and to compare knowledge management in SMEs with knowledge management in large companies. The research discovered that SMEs do not manage knowledge the same way as larger organizations.

  6. Strong Showing for AGU Journals in 2009 Impact Factors

    Science.gov (United States)

    Cook, Bill

    2010-06-01

    AGU publishes great science, which is recognized in several ways. One of the most widely recognized is from Thomson Reuters, which provides the Journal Citation Report (JCR) each year as a component of the Web of Science®. JCR reports on several measures of journal usage, including a journal's Eigenfactor score, its Article Influence score, its Impact Factor, and its rank within a cohort of similar journals. According to the 2009 statistics released last week, AGU again has outperformed its larger competitors. For the twelfth time, two different AGU titles hold the top rank in their categories, and AGU titles hold the second spot in two other categories and third in two more.

  7. Impact Factors Show Increased Use of AGU Journals in 2008

    Science.gov (United States)

    Ford, Barbara Meyers

    2009-07-01

    The latest numbers released from Journal Citation Reports (JCR), published annually by Thomson Reuters, show large increases in the impact factor (IF) for several AGU journals. IFs are one way for publishers to know that readers have found their journals useful and of value in research. A journal's IF is calculated by taking the total number of citations to articles published by a given journal in the past 2 years and dividing it by the total number of papers published by the journal in the same time period. More generally, it can be seen as the frequency with which articles in a journal have been cited over the past year. The numbers speak for themselves (see Table 1).

  8. Multi-factor climate change effects on insect herbivore performance

    DEFF Research Database (Denmark)

    Scherber, Christoph; Gladbach, David J; Stevnbak, Karen;

    2013-01-01

    The impact of climate change on herbivorous insects can have far-reaching consequences for ecosystem processes. However, experiments investigating the combined effects of multiple climate change drivers on herbivorous insects are scarce. We independently manipulated three climate change drivers (CO...... the drought treatment, and there was a three-way interaction between time, CO2, and drought. Survival was lowest when drought, warming, and elevated CO2 were combined. Effects of climate change drivers depended on other co-acting factors and were mediated by changes in plant secondary compounds, nitrogen...... suturalis Thomson), an important herbivore on heather, to ambient versus elevated drought, temperature, and CO2 (plus all combinations) for 5 weeks. Larval weight and survival were highest under ambient conditions and decreased significantly with the number of climate change drivers. Weight was lowest under...

  9. Factors related to the performance of Specialized Dental Care Centers

    Directory of Open Access Journals (Sweden)

    Flávia Christiane de Azevedo Machado

    2015-04-01

    Full Text Available The Specialized Dental Care Centers (SDCC have the mission to expand access to public medium complexity dental care and support the primary health care actions at this level of complexity. However, it is necessary to ensure the quality of services and to evaluate such services continuously to identify weaknesses and strengths that support the processes of leadership/management. Nevertheless, there is a dearth of studies on the assessment of oral health in specialized care that may indicate which factors should be investigated. Therefore, this integrated literature review sought to explore the plethora of publications on the evaluation of SDCC in the LILACS and MEDLINE data bases in October 2013 to identify factors possibly related to the performance of such health services. Thus, 13 references were included in this review pointing to forms of organization and management of work processes related to the creation of healthcare networks (operation of regulation centers and setting up of health consortiums. They include the contextual characteristics of the places where SDCCs are located (population size, Family Health Strategy coverage, Municipal Human Development Index, governance, governing capacity were factors that influenced the SDCCs performance.

  10. Validity of Basing Authors' Publication Strategy on Journal Impact Factors

    CERN Document Server

    Milojević, Staša; Bar-Ilan, Judit

    2016-01-01

    Choosing the best scientific venue for the submission of a manuscript, with the aim of maximizing the impact of the future publication, is a frequent task faced by scholars. In this paper, we show that the Impact Factor (IF) of a journal allows to rationally achieve this goal. We take advantage of a comprehensive bibliographic and citation dataset of about 2.5 million articles from 16,000 journals, and demonstrate that the probability of receiving more citations in one journal compared to another is a universal function of the IF values of the two journals. The relation is well described by a modified logistic function, and provides an easy-to-use rule to guide a publication strategy. The benefit of publishing in a journal with a higher IF value, instead of another with a lower one grows slowly as a function of the ratio of their IF values. For example, receiving more citations is granted in 90\\% of the cases only if the IF ratio is greater than $\\sim$6, while targeting a journal with an IF 2$\\times$ higher t...

  11. The impact of frequency on the performance of microwave ablation.

    Science.gov (United States)

    Sawicki, James F; Shea, Jacob D; Behdad, Nader; Hagness, Susan C

    2017-02-01

    The use of higher frequencies in percutaneous microwave ablation (MWA) may offer compelling interstitial antenna design advantages over the 915 MHz and 2.45 GHz frequencies typically employed in current systems. To evaluate the impact of higher frequencies on ablation performance, we conducted a comprehensive computational and experimental study of microwave absorption and tissue heating as a function of frequency. We performed electromagnetic and thermal simulations of MWA in ex vivo and in vivo porcine muscle at discrete frequencies in the 1.9-26 GHz range. Ex vivo ablation experiments were performed in the 1.9-18 GHz range. We tracked the size of the ablation zone across frequency for constant input power and ablation duration. Further, we conducted simulations to investigate antenna feed line heating as a function of frequency, input power, and cable diameter. As the frequency was increased from 1.9 to 26 GHz the resulting ablation zone dimensions decreased in the longitudinal direction while remaining relatively constant in the radial direction; thus at higher frequencies the overall ablation zone was more spherical. However, cable heating at higher frequencies became more problematic for smaller diameter cables at constant input power. Comparably sized ablation zones are achievable well above 1.9 GHz, despite increasingly localised power absorption. Specific absorption rate alone does not accurately predict ablation performance, particularly at higher frequencies where thermal diffusion plays an important role. Cable heating due to ohmic losses at higher frequencies may be controlled through judicious choices of input power and cable diameter.

  12. Impact of "JOBM": ISI Impact Factor Places the "Journal of Organizational Behavior Management" Third in Applied Psychology

    Science.gov (United States)

    Hantula, Donald A.

    2006-01-01

    The ISI Impact Factor for "JOBM" is 1.793, placing it third in the JCR rankings for journals in applied psychology with a sharply accelerating linear trend over the past 5 years. This article reviews the Impact Factor and raises questions regarding its reliability and validity and then considers a citation analysis of "JOBM" in light of the…

  13. Impact of "JOBM": ISI Impact Factor Places the "Journal of Organizational Behavior Management" Third in Applied Psychology

    Science.gov (United States)

    Hantula, Donald A.

    2006-01-01

    The ISI Impact Factor for "JOBM" is 1.793, placing it third in the JCR rankings for journals in applied psychology with a sharply accelerating linear trend over the past 5 years. This article reviews the Impact Factor and raises questions regarding its reliability and validity and then considers a citation analysis of "JOBM" in light of the…

  14. The Impact of Corporate Sustainability Strategies on the Financial Performance of Romanian Companies in the Context of Green Marketing

    OpenAIRE

    Marian Siminică; Liviu Crăciun; Adina Dinu

    2015-01-01

    The current research paper aims at making a comprehensive analysis of the current green marketing initiatives adopted by the top performing Romanian companies, in order to understand the determinant factors that influence their green approach and to evaluate the impact of the sustainability strategies implemented on their financial performance. The research of business sustainability strategies in 31 top performing companies in Romania is conducted by analyzing their green marketing initiativ...

  15. Performance of non-conventional factorization approaches for neutron kinetics

    Energy Technology Data Exchange (ETDEWEB)

    Bulla, S.; Nervo, M. [Politecnico di Torino, Dipartimento Energia, Corso Duca degli Abruzzi, 24, 10129 Torino (Italy)

    2013-07-01

    The use of factorization techniques provides a interesting option for the simulation of the time-dependent behavior of nuclear systems with a reduced computational effort. While point kinetics neglects all spatial and spectral effects, quasi-statics and multipoint kinetics allow to produce results with a higher accuracy for transients involving relevant modifications of the neutron distribution. However, in some conditions these methods can not work efficiently. In this paper, we discuss some possible alternative formulations for the factorization process for neutron kinetics, leading to mathematical models of reduced complications that can allow an accurate simulation of transients involving spatial and spectral effects. The performance of these innovative approaches are compared to standard techniques for some test cases, showing the benefits and shortcomings of the method proposed. (authors)

  16. Impact of Merger and Acquisition on University Performance.

    Science.gov (United States)

    Mohamadi Bolbanabad, Amjad; Mosadeghrad, Ali Mohammad; Arab, Mohammad; Majdzadeh, Reza

    2017-08-01

    Merger and acquisitions (M&A) widen access to higher education, improve quality of teaching and research, and increase efficiency of higher education institutions. Three big medical universities in Iran merged in 2010. The purpose of this study was to highlight the impact of this acquisition on the performance of Tehran University of Medical Sciences. This qualitative study was conducted using semi-structured in-depth interviews with 60 participants from April 2015 to November 2015. Purposeful sampling was used to recruit participants. Data analysis was performed using MAXQDA software (V. 10). The reasons for acquisition of IUMS by TUMS were to enhance the position of TUMS worldwide, and to increase its efficiency. The acquisition improved the organization and management of the newly formed TUMS, enhanced its academic position and market recognition. However, the achieved benefits did not come without shortcomings and unanticipated consequences. The merger and acquisition in higher education has some advantages and disadvantages. A well planned and carefully implemented M&A gives cutting edge to the higher education institutes.

  17. The Impact of Motivation on Employees� Performance and Satisfaction

    Directory of Open Access Journals (Sweden)

    Angela-Eliza Micu

    2016-07-01

    Full Text Available The Impact of Motivation on Employees� Performance and Satisfaction Abstract:The employees� motivation in the workplace was and still is present for many specialists in from the organizational psychology which continues to explore how we relate to our work and what really motivates us. Although literature offers a wide range of definitions in the process of motivation in the end they all converge on the same content. In everyday language, by reasoning it is understood "the why" for which an action is performed. The cause is a compulsion, desire, energy, envy. Meeting the needs will be done in a certain priority, specific to each individual. To be motivated it must be: a goal to be achieved, a direction of action, an excitement state, feelings that will generate efforts to achieve the goal. The most plausible explanation regarding the motivation is given by Anthony Bagshawe said that "motivation is something that drives us to do what we do." Motivation has always been a complex and delicate issue of great subtlety. It consists in discovering and exploitation of the internal resources of people and identification ways to make them work better and to spend energy more efficiently.

  18. Impact of dietary factors and food processing on food allergy.

    Science.gov (United States)

    Lepski, Silke; Brockmeyer, Jens

    2013-01-01

    Allergic reactions to food can significantly reduce the quality of life and even result in life-threatening complications. In addition, the prevalence of food allergy has increased in the last decades in industrialized countries and the mechanisms underlying (increased) sensitization are still not fully understood. It is believed that the development and maintenance of oral tolerance to food antigens is a process actively mediated by the immune system and that this reaction is essential to inhibit sensitization. Ongoing research indicates that different dietary factors also may contribute to immune homeostasis and oral tolerance to food and that food processing modulates allergenicity. One of the major questions in food allergy research is therefore which impact nutrition and food processing may have on allergenicity of food and perhaps on sensitization. We summarize in this review the different dietary factors that are believed to contribute to induction of oral tolerance and discuss the underlying mechanisms. In addition, the functional consequences of allergen modification will be emphasized in the second part as severity of allergic reactions and perhaps sensitization to food is influenced by structural modifications of food allergens.

  19. The impact of psychosis on social inclusion and associated factors.

    Science.gov (United States)

    Killaspy, Helen; White, Sarah; Lalvani, Nabeela; Berg, Rachel; Thachil, Ajoy; Kallumpuram, Sen; Nasiruddin, Omar; Wright, Christine; Mezey, Gill

    2014-03-01

    People with mental health problems are known to be socially excluded but the contribution of pre-morbid characteristics, symptoms and needs, and the impact on quality of life is unknown. To investigate change in social inclusion after the development of a psychotic Illness and factors associated with this. A cross-sectional community survey of people with psychosis was carried out in three areas of London. Five domains of social inclusion (social integration, consumption, access to services, productivity, political engagement) were assessed prior to the onset of illness and currently using the Social Inclusion Questionnaire User Experience. Quality of life, symptoms and needs were also assessed using standardized measures. Factors associated with change in social inclusion were investigated using multiple regression. Productivity and social integration among the 67 participants reduced after the onset of psychosis. Older age at onset and longer duration of illness were associated with greater reduction in productivity. Less reduction in social integration was associated with greater quality of life. Participants reported barriers to social inclusion that were directly related to symptoms of their illness, low confidence and poor self-esteem. A greater focus on interventions that can facilitate the occupation and the social networks of people with psychosis is required. Interventions that tackle 'self-stigma' may also prove useful in mitigating the social exclusion experienced by people with psychosis.

  20. Review of factors affecting aircraft wet runway performance

    Science.gov (United States)

    Yager, T. J.

    1983-01-01

    Problems associated with aircraft operations on wet runways are discussed and major factors which influence tire/runway braking and cornering traction capability are identified including runway characteristics, tire hydroplaning, brake system anomalies, and pilot inputs. Research results from investigations conducted at the Langley Aircraft Landing Loads and Traction Facility and from tests with instrumented ground vehicles and aircraft are summarized to indicate the effects of different aircraft, tire, and runway parameters. Several promising means are described for improving tire/runway water drainage capability, brake system efficiency, and pilot training to help optimize aircraft traction performance on wet runways.

  1. Factors Influencing Observed Tillage Impacts on Herbicide Transport

    Science.gov (United States)

    Pappas, E. A.; Huang, C.; Smith, D. R.

    2009-04-01

    The widespread use and potential human health effects of the herbicides atrazine and glyphosate have generated interest in establishing how no-tillage impacts loading of these herbicides to runoff water in comparison to other tillage practices. In this study, potentially confounding factos such as time in tillage practice and type and distribution of residue cover, are weighed against inherent tillage impacts to soil structure in terms of relative effects on herbicide transport with runoff water. In this study, two small watersheds (one in no-till (NT) and one rotational till (RT)) were monitored during the first three years since conversion of the RT watershed from NT. In addition, rainfall simulation was applied to plots within each watershed during the first, third, and fifth years since the conversion. Runoff atrazine and glyphosate losses from RT areas were compared to losses from NT areas as a ratio of RT:NT. Results indicate a trend of increasing RT:NT value with time in tillage. Watershed monitoring indicated greater herbicide loading to runoff water from the NT watershed than the RT watershed during the first year since RT conversion, but this relationship reversed by the third year since conversion to RT. In addition, rainfall simulations were performed on small boxes of NT or RT soil having varying types and levels of residue cover in an attempt to isolate residue cover effects from true tillage effects.

  2. L’Implantation De L’Erp : Facteurs Cles Du Succes Et Impacte Sur La Performance

    Directory of Open Access Journals (Sweden)

    Dumitru Valentin

    2008-04-01

    Full Text Available The implantation of an ERP (abbreviation for "Enterprise Resource Planning" system is an enterprise project that implies the remodeling of the information system, mostly the rethinking of management procedures within the organization. The expansion and the complexity of these projects demand a theoretical framework and « optimal practices » in order to model and to evaluate the key factors of implementation success and to analyze its impact on the organization’s performance. The research problem of our communication can be divided into three research questions: • What conceptual framework for ERP implantation? • What are the key factors of success in ERP implantation? • What is the relationship between ERP implantation and enterprise performance?

  3. The scientific impact of nations: journal placement and citation performance.

    Science.gov (United States)

    Smith, Matthew J; Weinberger, Cody; Bruna, Emilio M; Allesina, Stefano

    2014-01-01

    International collaboration is becoming increasingly important for the advancement of science. To gain a more precise understanding of how factors such as international collaboration influence publication success, we divide publication success into two categories: journal placement and citation performance. Analyzing all papers published between 1996 and 2012 in eight disciplines, we find that those with more countries in their affiliations performed better in both categories. Furthermore, specific countries vary in their effects both individually and in combination. Finally, we look at the relationship between national output (in papers published) and input (in citations received) over the 17 years, expanding upon prior depictions by also plotting an expected proportion of citations based on Journal Placement. Discrepancies between this expectation and the realized proportion of citations illuminate trends in performance, such as the decline of the Global North in response to rapidly developing countries, especially China. Yet, most countries' show little to no discrepancy, meaning that, in most cases, citation proportion can be predicted by Journal Placement alone. This reveals an extreme asymmetry between the opinions of a few reviewers and the degree to which paper acceptance and citation rates influence career advancement.

  4. The scientific impact of nations: journal placement and citation performance.

    Directory of Open Access Journals (Sweden)

    Matthew J Smith

    Full Text Available International collaboration is becoming increasingly important for the advancement of science. To gain a more precise understanding of how factors such as international collaboration influence publication success, we divide publication success into two categories: journal placement and citation performance. Analyzing all papers published between 1996 and 2012 in eight disciplines, we find that those with more countries in their affiliations performed better in both categories. Furthermore, specific countries vary in their effects both individually and in combination. Finally, we look at the relationship between national output (in papers published and input (in citations received over the 17 years, expanding upon prior depictions by also plotting an expected proportion of citations based on Journal Placement. Discrepancies between this expectation and the realized proportion of citations illuminate trends in performance, such as the decline of the Global North in response to rapidly developing countries, especially China. Yet, most countries' show little to no discrepancy, meaning that, in most cases, citation proportion can be predicted by Journal Placement alone. This reveals an extreme asymmetry between the opinions of a few reviewers and the degree to which paper acceptance and citation rates influence career advancement.

  5. CSAC Characterization and Its Impact on GNSS Clock Augmentation Performance

    Science.gov (United States)

    Fernández, Enric; Calero, David; Parés, M. Eulàlia

    2017-01-01

    Chip Scale Atomic Clocks (CSAC) are recently-developed electronic instruments that, when used together with a Global Navigation Satellite Systems (GNSS) receiver, help improve the performance of GNSS navigation solutions in certain conditions (i.e., low satellite visibility). Current GNSS receivers include a Temperature Compensated Cristal Oscillator (TCXO) clock characterized by a short-term stability (τ = 1 s) of 10−9 s that leads to an error of 0.3 m in pseudorange measurements. The CSAC can achieve a short-term stability of 2.5 × 10−12 s, which implies a range error of 0.075 m, making for an 87.5% improvement over TCXO. Replacing the internal TCXO clock of GNSS receivers with a higher frequency stability clock such as a CSAC oscillator improves the navigation solution in terms of low satellite visibility positioning accuracy, solution availability, signal recovery (holdover), multipath and jamming mitigation and spoofing attack detection. However, CSAC suffers from internal systematic instabilities and errors that should be minimized if optimal performance is desired. Hence, for operating CSAC at its best, the deterministic errors from the CSAC need to be properly modelled. Currently, this modelling is done by determining and predicting the clock frequency stability (i.e., clock bias and bias rate) within the positioning estimation process. The research presented in this paper aims to go a step further, analysing the correlation between temperature and clock stability noise and the impact of its proper modelling in the holdover recovery time and in the positioning performance. Moreover, it shows the potential of fine clock coasting modelling. With the proposed model, an improvement in vertical positioning precision of around 50% with only three satellites can be achieved. Moreover, an increase in the navigation solution availability is also observed, a reduction of holdover recovery time from dozens of seconds to only a few can be achieved. PMID:28216600

  6. CSAC Characterization and Its Impact on GNSS Clock Augmentation Performance

    Directory of Open Access Journals (Sweden)

    Enric Fernández

    2017-02-01

    Full Text Available Chip Scale Atomic Clocks (CSAC are recently-developed electronic instruments that, when used together with a Global Navigation Satellite Systems (GNSS receiver, help improve the performance of GNSS navigation solutions in certain conditions (i.e., low satellite visibility. Current GNSS receivers include a Temperature Compensated Cristal Oscillator (TCXO clock characterized by a short-term stability (τ = 1 s of 10−9 s that leads to an error of 0.3 m in pseudorange measurements. The CSAC can achieve a short-term stability of 2.5 × 10−12 s, which implies a range error of 0.075 m, making for an 87.5% improvement over TCXO. Replacing the internal TCXO clock of GNSS receivers with a higher frequency stability clock such as a CSAC oscillator improves the navigation solution in terms of low satellite visibility positioning accuracy, solution availability, signal recovery (holdover, multipath and jamming mitigation and spoofing attack detection. However, CSAC suffers from internal systematic instabilities and errors that should be minimized if optimal performance is desired. Hence, for operating CSAC at its best, the deterministic errors from the CSAC need to be properly modelled. Currently, this modelling is done by determining and predicting the clock frequency stability (i.e., clock bias and bias rate within the positioning estimation process. The research presented in this paper aims to go a step further, analysing the correlation between temperature and clock stability noise and the impact of its proper modelling in the holdover recovery time and in the positioning performance. Moreover, it shows the potential of fine clock coasting modelling. With the proposed model, an improvement in vertical positioning precision of around 50% with only three satellites can be achieved. Moreover, an increase in the navigation solution availability is also observed, a reduction of holdover recovery time from dozens of seconds to only a few can be achieved.

  7. The Carbon_h-factor: predicting individuals' research impact at early stages of their career.

    Science.gov (United States)

    Carbon, Claus-Christian

    2011-01-01

    Assessing an individual's research impact on the basis of a transparent algorithm is an important task for evaluation and comparison purposes. Besides simple but also inaccurate indices such as counting the mere number of publications or the accumulation of overall citations, and highly complex but also overwhelming full-range publication lists in their raw format, Hirsch (2005) introduced a single figure cleverly combining different approaches. The so-called h-index has undoubtedly become the standard in scientometrics of individuals' research impact (note: in the present paper I will always use the term "research impact" to describe the research performance as the logic of the paper is based on the h-index, which quantifies the specific "impact" of, e.g., researchers, but also because the genuine meaning of impact refers to quality as well). As the h-index reflects the number h of papers a researcher has published with at least h citations, the index is inherently positively biased towards senior level researchers. This might sometimes be problematic when predictive tools are needed for assessing young scientists' potential, especially when recruiting early career positions or equipping young scientists' labs. To be compatible with the standard h-index, the proposed index integrates the scientist's research age (Carbon_h-factor) into the h-index, thus reporting the average gain of h-index per year. Comprehensive calculations of the Carbon_h-factor were made for a broad variety of four research-disciplines (economics, neuroscience, physics and psychology) and for researchers performing on three high levels of research impact (substantial, outstanding and epochal) with ten researchers per category. For all research areas and output levels we obtained linear developments of the h-index demonstrating the validity of predicting one's later impact in terms of research impact already at an early stage of their career with the Carbon_h-factor being approx. 0.4, 0.8, and

  8. Do night naps impact driving performance and daytime recovery sleep?

    Science.gov (United States)

    Centofanti, Stephanie A; Dorrian, Jillian; Hilditch, Cassie J; Banks, Siobhan

    2017-02-01

    Short, nighttime naps are used as a fatigue countermeasure in night shift work, and may offer protective benefits on the morning commute. However, there is a concern that nighttime napping may impact upon the quality of daytime sleep. The aim of the current project was to investigate the influence of short nighttime naps (sleep. Thirty-one healthy subjects (aged 21-35 y; 18 females) participated in a 3-day laboratory study. After a 9-h baseline sleep opportunity (22:00h-07:00h), subjects were kept awake the following night with random assignment to: a 10-min nap ending at 04:00h plus a 10-min nap at 07:00h; a 30-min nap ending at 04:00h; or a no-nap control. A 40-min driving simulator task was administered at 07:00h and 18:30h post-recovery sleep. All conditions had a 6-h daytime recovery sleep opportunity (10:00h-16:00h) the next day. All sleep periods were recorded polysomnographically. Compared to control, the napping conditions did not significantly impact upon simulated driving lane variability, percentage of time in a safe zone, or time to first crash on morning or evening drives (p>0.05). Short nighttime naps did not significantly affect daytime recovery total sleep time (p>0.05). Slow wave sleep (SWS) obtained during the 30-min nighttime nap resulted in a significant reduction in SWS during subsequent daytime recovery sleep (psleep following a night shift. Further investigation is needed to examine the optimal timing, length or combination of naps for reducing performance decrements on the morning commute, whilst still preserving daytime sleep quality. Copyright © 2015 Elsevier Ltd. All rights reserved.

  9. Factors Affecting Performance of Stock Market: Evidence from South Asian Countries

    Directory of Open Access Journals (Sweden)

    Aurangzeb

    2012-09-01

    Full Text Available This study identifies the factor affecting performance of stock market in South Asia. The data used in this study were collected from the period of 1997 to 2010 of 3 South Asian countries namely, Pakistan, India and Sri Lanka. Regression results indicate that foreign direct investment and exchange rate have significant positive impact on performance of stock market in South Asian countries while; interest rate has negative and significant impact on performance of stock market in South Asia. Results also indicate the negative but insignificant impact of inflation on stock market performance in South Asia. It is recommended that in order to take the full advantage of stock market and carry on with the international markets well managed macroeconomic policies are necessary in which interest rates and inflation rate are thoroughly monitor and try to reduce the value as much possible. It gives the confidence to the investors as well as the industries. It is also recommended that some extra benefits were given to the foreign investors because we observed that the influence of foreign investors is strong in this region.

  10. Impact of different Moodle Course Designs on Students’ Performance

    Directory of Open Access Journals (Sweden)

    Gustavo R. Alves

    2013-03-01

    Full Text Available This work describes the impact of different teachers’ approaches in using Moodle, for supporting their courses, at the Polytechnic of Porto - School of Engineering. The study covers five different courses, from different degrees and different years, and includes a number of Moodle resources especially supporting laboratory classes. These and other active resources are particularly analyzed in order to evaluate students’ adherence to them. One particular course includes a number of remote experiments, made available through VISIR (Virtual Instrument Systems in Reality and directly accessible through links included in the Moodle course page. The collected data have been correlated with students’ classifications in the lab component and in the exam, each one weighting 50% of their final marks. This analysis benefited from the existence of different teachers’ approaches, which resulted in a diversity of Moodle-supported environments. Conclusions point to the existence of a positive correlation factor between the number of Moodle accesses and the final exam grade, although the quality of the resources made available by the teachers seems to be preponderant over its quantity. In addition, different students perspectives were found regarding active resources: while some seem to encourage students to participate (for instance online quiz or online reports, others, more demanding, are unable to stimulate the majority of them.

  11. Reservoir performance under uncertainty in hydrologic impacts of climate change

    Science.gov (United States)

    Raje, Deepashree; Mujumdar, P. P.

    2010-03-01

    Relatively few studies have addressed water management and adaptation measures in the face of changing water balances due to climate change. The current work studies climate change impact on a multipurpose reservoir performance and derives adaptive policies for possible future scenarios. The method developed in this work is illustrated with a case study of Hirakud reservoir on the Mahanadi river in Orissa, India, which is a multipurpose reservoir serving flood control, irrigation and power generation. Climate change effects on annual hydropower generation and four performance indices (reliability with respect to three reservoir functions, viz. hydropower, irrigation and flood control, resiliency, vulnerability and deficit ratio with respect to hydropower) are studied. Outputs from three general circulation models (GCMs) for three scenarios each are downscaled to monsoon streamflow in the Mahanadi river for two future time slices, 2045-65 and 2075-95. Increased irrigation demands, rule curves dictated by increased need for flood storage and downscaled projections of streamflow from the ensemble of GCMs and scenarios are used for projecting future hydrologic scenarios. It is seen that hydropower generation and reliability with respect to hydropower and irrigation are likely to show a decrease in future in most scenarios, whereas the deficit ratio and vulnerability are likely to increase as a result of climate change if the standard operating policy (SOP) using current rule curves for flood protection is employed. An optimal monthly operating policy is then derived using stochastic dynamic programming (SDP) as an adaptive policy for mitigating impacts of climate change on reservoir operation. The objective of this policy is to maximize reliabilities with respect to multiple reservoir functions of hydropower, irrigation and flood control. In variations to this adaptive policy, increasingly more weightage is given to the purpose of maximizing reliability with respect to

  12. Impact of Swarm GPS receiver updates on POD performance

    Science.gov (United States)

    van den IJssel, Jose; Forte, Biagio; Montenbruck, Oliver

    2016-05-01

    The Swarm satellites are equipped with state-of-the-art Global Positioning System (GPS) receivers, which are used for the precise geolocation of the magnetic and electric field instruments, as well as for the determination of the Earth's gravity field, the total electron content and low-frequency thermospheric neutral densities. The onboard GPS receivers deliver high-quality data with an almost continuous data rate. However, the receivers show a slightly degraded performance when flying over the geomagnetic poles and the geomagnetic equator, due to ionospheric scintillation. Furthermore, with only eight channels available for dual-frequency tracking, the amount of collected GPS tracking data is relatively low compared with various other missions. Therefore, several modifications have been implemented to the Swarm GPS receivers. To optimise the amount of collected GPS data, the GPS antenna elevation mask has slowly been reduced from 10° to 2°. To improve the robustness against ionospheric scintillation, the bandwidths of the GPS receiver tracking loops have been widened. Because these modifications were first implemented on Swarm-C, their impact can be assessed by a comparison with the close flying Swarm-A satellite. This shows that both modifications have a positive impact on the GPS receiver performance. The reduced elevation mask increases the amount of GPS tracking data by more than 3 %, while the updated tracking loops lead to around 1.3 % more observations and a significant reduction in tracking losses due to severe equatorial scintillation. The additional observations at low elevation angles increase the average noise of the carrier phase observations, but nonetheless slightly improve the resulting reduced-dynamic and kinematic orbit accuracy as shown by independent satellite laser ranging (SLR) validation. The more robust tracking loops significantly reduce the large carrier phase observation errors at the geomagnetic poles and along the geomagnetic

  13. Knowledge management adoption and its impact on organizational learning and non-financial performance

    Directory of Open Access Journals (Sweden)

    Yudho Giri Sucahyo

    2016-06-01

    Full Text Available This paper aims to investigate the determinants of knowledge management (KM adoption on organizational and individual level, as well as its impact on non-financial performance through an intermediary of organizational learning (“OL”. The KM adoption model was constructed by using a combination of TOE (Technology, Organizational and Environment for the organizational level and TPE (Technology, Personal, and Environmental framework for the individual level; this we called the TOPE (Technology, Personal, Organizational, and Environment framework. Questionnaires were sent to 60 Indonesian big companies which participated in the Most Admired Knowledge Enterprise (MAKE Award. Data from 139 respondents (51 companies was analysed using partial least squares (PLS. This study showed the most essential factors influencing KM adoption and practice are perceived usefulness, ease of use of KM technology, industrial factors, management support, organization culture, and IT infrastructure. Meanwhile, the factors that are loosely connected to adoption initiative and KM practice are mimetic pressure, strategic planning, and organizational structure. In addition, the result of this study inferred that KM adoption and implementation fairly impact on the improvement of non-financial performance by the intermediary of organizational learning capability improvement.

  14. Factors Affecting Exercise Test Performance in Patients After Liver Transplantation

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    Kotarska

    2016-03-01

    Full Text Available Background Cardiovascular diseases are a leading cause of morbidity and mortality in solid organ transplant recipients. In addition, low physical activity is a risk factor for cardiac and cerebrovascular complications. Objectives This study examined potential relationships between physical activity, health-related quality of life (HRQoL, risk factors for cardiovascular disease, and an exercise test in liver-graft recipients. Patients and Methods A total of 107 participants (62 men/45 women who had received a liver transplantation (LT at least 6 months previously were evaluated. Physical activity was assessed using three different questionnaires, while HRQoL was assessed using the medical outcomes study short form (SF-36 questionnaire, and health behaviors were evaluated using the health behavior inventory (HBI. The exercise test was performed in a standard manner. Results Seven participants (6.5% had a positive exercise test, and these individuals were older than those who had a negative exercise test (P = 0.04. A significant association between a negative exercise test and a higher level of physical activity was shown by the Seven-day physical activity recall questionnaire. In addition, HRQoL was improved in various domains of the SF-36 in participants who had a negative exercise test. No correlations between physical activity, the exercise test and healthy behaviors, as assessed via the HBI were observed. Conclusions Exercise test performance was affected by lower quality of life and lower physical activity after LT. With the exception of hypertension, well known factors that affect the risk of coronary artery disease had no effect on the exercise test results.

  15. Meta-analysis of Factors Affecting Occupational and Professional Performance of Agricultural Extension Agents

    Directory of Open Access Journals (Sweden)

    Mahshid Bahadori

    2016-03-01

    Full Text Available The purpose of this research is to do a meta-analysis of studies about the results of researches conducted related to the factors affecting the occupational and professionalism performance in the field of agricultural extension agents, in order to integrate the results of research independently carried out to obtain more accurate and more cohesive results. In order to achieve the goal, 177 researches made on the occupational and professional performance (occupational performance, professional performance, professional competence, professional developmentwere collected from sites magiran & sid, and among them, 10 research were selected utilizing tools "check list of technical and methodological research" (including appropriate reliability and validity statistical and sampling correct methodto review and metaanalysis. The results showed that professional features have the greatest impact on the professional and occupational performance of agricultural extension agents. As well, skills and technical competence, the number of field visits, membership of organizations, participation in in-service training courses and access to educational facilities have a high impact on occupational and professional performance. The researchers confirmed these results.

  16. Levels of Management Commitment: A Moderator the Structural Relationships among Critical Success Factors of TQM, World-Class Performance in Operations, and Company Financial Performance

    Directory of Open Access Journals (Sweden)

    Wakhid Slamet Ciptono

    2012-01-01

    Full Text Available This study investigates the moderating impacts of the three levels of management commitment (top, middle, and low levels on the structural relationships among the constructs— six critical success factors of TQM (quality improvement program, supervisory leadership, supplier involvement, management commitment, training to improve products/services, cross-functional relationships; world-class performance in operations (world-class company practices, operational excellence practices, company non-financial performance; and company financial performance. It uses a sample of 1,332 managers in 140 strategic business units (SBUs within 49 oil and gas companies in Indonesia. The empirical results indicate that the goodness-of-fit of the unconstrained model is much better than that of the constrained model, and this is an indicative that the three level of management moderates the structural relationships among the constructs. Those are, three levels of management act as a moderator variable between critical success factors of TQM, world-class company practices, operational excellence practices, company non-financial performance, and company financial performance. Results further reveal that world-class performances in operations (world-class company practices, operational excellence practices, and company non-financial performance were positively mediated the impact of critical success factors of TQM on company financial performance. Results also point out that five of six critical success factors of TQM positively associated with world-class company practices and operational excellence practices under the three levels of management (top, middle, low. World-class company practices and operational excellence practices have direct and significant effects on company non-financial performance (productivity, operational reliability. Furthermore, empirical results suggest that there is a positive and significant relationship between company non

  17. Levels of Management Commitment: A Moderator the Structural Relationships among Critical Success Factors of TQM, World-Class Performance in Operations, and Company Financial Performance

    Directory of Open Access Journals (Sweden)

    Wakhid Slamet Ciptono

    2012-01-01

    Full Text Available This study investigates the moderating impacts of the three levels of management commitment (top, middle, and low levels on the structural relationships among the constructs— six critical success factors of TQM (quality improvement program, supervisory leadership, supplier involvement, management commitment, training to improve products/services, cross-functional relationships; world-class performance in operations (world-class company practices, operational excellence practices, company non-financial performance; and company financial performance. It uses a sample of 1,332 managers in 140 strategic business units (SBUs within 49 oil and gas companies in Indonesia. The empirical results indicate that the goodness-of-fit of the unconstrained model is much better than that of the constrained model, and this is an indicative that the three level of management moderates the structural relationships among the constructs. Those are, three levels of management act as a moderator variable between critical success factors of TQM, world-class company practices, operational excellence practices, company non-financial performance, and company financial performance. Results further reveal that world-class performances in operations (world-class company practices, operational excellence practices, and company non-financial performance were positively mediated the impact of critical success factors of TQM on company financial performance. Results also point out that five of six critical success factors of TQM positively associated with world-class company practices and operational excellence practices under the three levels of management (top, middle, low. World-class company practices and operational excellence practices have direct and significant effects on company non-financial performance (productivity, operational reliability. Furthermore, empirical results suggest that there is a positive and significant relationship between company non

  18. Impact of ternary blends of biodiesel on diesel engine performance

    Directory of Open Access Journals (Sweden)

    Prem Kumar

    2016-06-01

    Full Text Available The Pongamia and waste cooking oils are the main non edible oils for biodiesel production in India. The aim of the present work is to evaluate the fuel properties and investigate the impact on engine performance using Pongamia and waste cooking biodiesel and their ternary blend with diesel. The investigation of the fuel properties shows that Pongamia biodiesel and waste cooking biodiesel have poor cold flow property. This will lead to starting problem in the engine operation. To overcome this problem the ternary blends of diesel, waste cooking biodiesel and Pongamia biodiesel are prepared. The cloud and pour point for ternary blend, (WCB20:PB20:D60 were found to be 7 °C and 6.5 °C which are comparable to cloud and pour point of diesel 6 °C and 5 °C, respectively. The result of the test showed that brake specific fuel consumption for Pongamia biodiesel and waste cooking biodiesel is higher than ternary blend, (WCB20:PB20:D60 due to their lower energy content. The brake thermal efficiency of ternary blend and diesel is comparable while the Pongamia and waste cooking biodiesel have low efficiency. The result of investigation showed that ternary blend can be developed as alternate fuel.

  19. Performance of the Incontinence Impact Questionnaire in Canada.

    Science.gov (United States)

    Beaulieu, Sylvie; Collet, Jean-Paul; Tu, Le Mai; Macrammalla, Effat; Wood-Dauphinee, Sharon; Corcos, Jacques

    1999-02-01

    The Incontinence Impact Questionnaire (IIQ) was developed in the US and has been shown to be a valid and reliable measure of how urinary incontinence (UI) affects a woman's quality of life. This study aimed to test the performance of the IIQ in Canada with English and French-speaking Canadians. The IIQ underwent professional forwards-backwards translation and psychometric testing. Women (36 English and 34 French-speaking) consulting a urologist for stress urinary incontinence underwent routine multichannel urodynamic testing and completed the SF-36 and the IIQ. Test-retest reliability was moderate (ICC =.73) and each IIQ subscale demonstrated good internal consistency (a=.83 to.91). Moderate correlations between IIQ scores and number of pads/day and severity ratings support construct validity in both languages. In English, correlations with Physical and Social Functioning scales of the SF-36 were also moderate. The IIQ has demonstrated strong reliability and adequate validity with English-speaking Canadian women. Moreover, similar psychometric properties in both English and French provide evidence that the IIQ has been successfully translated into Canadian French.

  20. Stemmer Impact on Quranic Mobile Information Retrieval Performance

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    Huda Omar Aljaloud

    2016-12-01

    Full Text Available Stemming algorithms are employed in information retrieval (IR to reduce verity variants of the same word with several endings to a standard stem. Stemmers can also help IR systems by unifying vocabulary, reducing term variants, reducing storage space, and increasing the likelihood of matching documents, all of which make stemming very attractive for use in IR. This paper aims to study the impact of using stemming techniques in mobile effectiveness. Two-word extraction stemming techniques will be used: a light stemmer and a dictionary-lookup stemmer. Also, three sets of experiments were conducted in this research in order to raise the efficiency of mobile aapplications. Implementing the two stemming approaches and assessing their accuracy by calculating the precision, recall, MAP, and f-measure, produced results which show that the light10 stemmer outperforms the dictionary-lookup stemmer in precision and MAP. Furthermore, the mobile performance of the light10 stemmer exceeds that of the dictionary-based stemmer.

  1. Impact of temperature on performance of series and parallel connected mono-crystalline silicon solar cells

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    Subhash Chander

    2015-11-01

    Full Text Available This paper presents a study on impact of temperature on the performance of series and parallel connected mono-crystalline silicon (mono-Si solar cell employing solar simulator. The experiment was carried out at constant light intensity 550 W/m2with cell temperature in the range 25–60 oC for single, series and parallel connected mono-Si solar cells. The performance parameters like open circuit voltage, maximum power, fill factor and efficiency are found to decrease with cell temperature while the short circuit current is observed to increase. The experimental results reveal that silicon solar cells connected in series and parallel combinations follow the Kirchhoff’s laws and the temperature has a significant effect on the performance parameters of solar cell.

  2. The impact of the dimensions of environmental performance on firm performance in travel and tourism industry.

    Science.gov (United States)

    Tan, Siow-Hooi; Habibullah, Muzafar Shah; Tan, Siow-Kian; Choon, Shay-Wei

    2017-12-01

    This study investigates the impact of the aggregate and individual dimensions of environmental performance (EP) on financial performance (FP), based on a dataset covering the travel and tourism industry (airlines, casinos, hotels, and restaurants) across different economic regions over the period 2003-2014. The results reveal that EP positively affects the FP in the hotel industry when aggregate EP is used. When individual dimensions of EP are considered, resource reduction is found to positively (negatively) affect the performance in the hotel (airline) industry, while product innovation positively affects the performance in the restaurant industry. Hence, the trade-off effect seems to be dominant in the airline industry, and the 'heterogeneous resources and reputation-building' hypothesis is evident in both the hotel and restaurant industries. In addition, in general, the findings support the positive moderating effect of slack resources on the relationship between the individual dimensions of EP and FP in the travel and tourism industry, and, hence, are supportive of the slack resources hypothesis. These effects, however, vary depending on the travel and tourism industry under investigation. Copyright © 2017 Elsevier Ltd. All rights reserved.

  3. Impact of a pay-for-performance program on low performing physicians.

    Science.gov (United States)

    Chen, Judy Ying; Kang, Ning; Juarez, Deborah Taira; Hodges, Krista A; Chung, Richard S; Legorreta, Antonio P

    2010-01-01

    Studies have shown that the lowest performing physicians in pay-for-performance (P4P) programs improved the most; however, it is unclear whether this would occur without the P4P program or be sustained. The objective of this study is to investigate the impact of P4P in a Preferred Provider Organization (PPO) on low performing physicians over a 4-year period. We used administrative claims data from a PPO health plan in Hawaii, which implemented a P4P program, and a PPO plan in the South, which did not implement a P4P program. The difference-indifference model was used to compare the quality scores between the two physician groups in preventive measures, a heart failure measure, and an HbA1c testing measure. We found that P4P programs may be effective in incentivizing low performing physicians to improvement quality of care and sustain improvement, and the positive benefit of the P4P program may not be realized until the 3rd or 4th year of the program.

  4. Environmental impact and risk assessments and key factors contributing to the overall uncertainties.

    Science.gov (United States)

    Salbu, Brit

    2016-01-01

    There is a significant number of nuclear and radiological sources that have contributed, are still contributing, or have the potential to contribute to radioactive contamination of the environment in the future. To protect the environment from radioactive contamination, impact and risk assessments are performed prior to or during a release event, short or long term after deposition or prior and after implementation of countermeasures. When environmental impact and risks are assessed, however, a series of factors will contribute to the overall uncertainties. To provide environmental impact and risk assessments, information on processes, kinetics and a series of input variables is needed. Adding problems such as variability, questionable assumptions, gaps in knowledge, extrapolations and poor conceptual model structures, a series of factors are contributing to large and often unacceptable uncertainties in impact and risk assessments. Information on the source term and the release scenario is an essential starting point in impact and risk models; the source determines activity concentrations and atom ratios of radionuclides released, while the release scenario determine the physico-chemical forms of released radionuclides such as particle size distribution, structure and density. Releases will most often contain other contaminants such as metals, and due to interactions, contaminated sites should be assessed as a multiple stressor scenario. Following deposition, a series of stressors, interactions and processes will influence the ecosystem transfer of radionuclide species and thereby influence biological uptake (toxicokinetics) and responses (toxicodynamics) in exposed organisms. Due to the variety of biological species, extrapolation is frequently needed to fill gaps in knowledge e.g., from effects to no effects, from effects in one organism to others, from one stressor to mixtures. Most toxtests are, however, performed as short term exposure of adult organisms

  5. Self-citation rate and impact factor in ophthalmology.

    Science.gov (United States)

    Mimouni, Michael; Segal, Ori

    2014-01-01

    To analyze the self-citation rate (SCR) of ophthalmology journals, determine its possible effect on a journal's impact factor (IF) and compare the SCR of subspecialty journals versus general ophthalmology journals. A retrospective consecutive study of ophthalmology journals listed in the Journal Citations Report (JCR) 2013. We retrieved these parameters from each journal's report: IF, total citations, self-citations, SCR and IF without self-citations (corrected IF). A significant correlation was detected between the number of self-citations and publications (R(2) = 86.3, p = 0.000). Subspecialty journals had a significantly higher SCR than general journals (p = 0.017). No significant difference was found in terms of IF and corrected IF between general and subspecialty journals (p = 0.260 and p = 0.108, respectively). No significant correlation between IF and SCR was detected (p = 0.099). The corrected IF was inversely correlated with SCR (R(2) = -32.6, p = 0.013). An inverse correlation was detected between SCR and IF in the 29 ophthalmology journals with the lowest IF (R(2) = -57.3, p = 0.001). Unlike other fields of medicine, the IF of an ophthalmology journal does not correlate with its SCR. Self-citation is found more often in journals with a low corrected IF and is inversely correlated with IF in the bottom half. © 2014 S. Karger AG, Basel.

  6. Clarivate Analytics: Continued Omnia vanitas Impact Factor Culture.

    Science.gov (United States)

    Teixeira da Silva, Jaime A; Bernès, Sylvain

    2017-02-23

    This opinion paper takes aim at an error made recently by Clarivate Analytics in which it sent out an email that congratulated academics for becoming exclusive members of academia's most cited elite, the Highly Cited Researchers (HCRs). However, that email was sent out to an undisclosed number of non-HCRs, who were offered an apology shortly after, through a bulk mail, which tried to down-play the importance of the error, all the while praising the true HCRs. When Clarivate Analytics senior management was contacted, the company declined to offer an indication of the number of academics who had been contacted and erroneously awarded the HCR status. We believe that this regrettable blunder, together with the opacity offered by the company, fortify the corporate attitude about the value of the journal impact factor (JIF), and what it represents, namely a marketing tool that is falsely used to equate citations with quality, worth, or influence. The continued commercialization of metrics such as the JIF is at the heart of their use to assess the "quality" of a researcher, their work, or a journal, and contributes to a great extent to driving scientific activities towards a futile endeavor.

  7. A Demonstration of the Impact of Outliers on the Decisions about the Number of Factors in Exploratory Factor Analysis

    Science.gov (United States)

    Liu, Yan; Zumbo, Bruno D.; Wu, Amery D.

    2012-01-01

    Previous studies have rarely examined the impact of outliers on the decisions about the number of factors to extract in an exploratory factor analysis. The few studies that have investigated this issue have arrived at contradictory conclusions regarding whether outliers inflated or deflated the number of factors extracted. By systematically…

  8. The Factors Affecting Performance of Nurse at Paniai General Hospital

    Directory of Open Access Journals (Sweden)

    Elias Tatogo

    2017-02-01

    Full Text Available General hospital of Paniai regency health service institution under Local Government Paniai Regency with amount of nurse resource counted 69 one who have duty to remain to can improve more certifiable service and reached by society, so to be form degree of health which at the farthest, so that nurse performance of vital importance in giving of health service. The goal of research: To knowing of factors affecting performance of nurse at Paniai general hospital. Method: Type research is causal associative by using quantitative approach. Sample is all of nurse as much 69 nurse with date implemented in October 2016. Data obtained used questioner and analyzed by chi square test. Result of research is obtained that factor’s affecting of nurse performance in Paniai General Hospital is motivation (p-value = 0,001; RP = 3,000; CI95%= 1,607 - 5,601, [job/activity] discipline (p-value = 0,043; RP = 2,068; CI95%= 1,150 - 3,719, reward (p- value = 0,001; RP = 5,008; CI95%= 1,656 - 15,142, punishment (p- value = 0,000 ; RP= 16,839; CI95%= ( 4,310 - 65,784 and style leadership [of] director (p- value = 0,000; RP = 3,333; CI95%= 1,742 - 6,380. The factor’s not related of nurse performance at Paniai general hospital is age (p- value = 1,000 ; RP = 0,908; CI95%= 0,456 - 1,806, long working (p- value = 1,000; RP = 0,908; CI95%= 0,456 - 1,806 and job rotation (p- value = 0,843; RP = 1,190; CI95%= 0,603 – 2,348.

  9. Influence of multiple dynamic factors on the performance of myoelectric pattern recognition.

    Science.gov (United States)

    Khushaba, Rami N; Al-Timemy, Ali; Kodagoda, Sarath

    2015-08-01

    Hand motion classification using surface Electromyogram (EMG) signals has been widely studied for the control of powered prosthetics in laboratory conditions. However, clinical applicability has been limited, as imposed by factors like electrodes shift, variations in the contraction force levels, forearm rotation angles, change of limb position and many other factors that all affect the EMG pattern recognition performance. While the impact of several of these factors on EMG parameter estimation and pattern recognition has been considered individually in previous studies, a minimum number of experiments were reported to study the influence of multiple dynamic factors. In this paper, we investigate the combined effect of varying forearm rotation angles and contraction force levels on the robustness of EMG pattern recognition, while utilizing different time-and-frequency based feature extraction methods. The EMG pattern recognition system has been validated on a set of 11 subjects (ten intact-limbed and one bilateral transradial amputee) performing six classes of hand motions, each with three different force levels, each at three different forearm rotation angles, with six EMG electrodes plus an accelerometer on the subjects' forearm. Our results suggest that the performance of the learning algorithms can be improved with the Time-Dependent Power Spectrum Descriptors (TD-PSD) utilized in our experiments, with average classification accuracies of up to 90% across all subjects, force levels, and forearm rotation angles.

  10. The impact of intrinsic and extrinsic factors on the job satisfaction of dentists.

    Science.gov (United States)

    Goetz, K; Campbell, S M; Broge, B; Dörfer, C E; Brodowski, M; Szecsenyi, J

    2012-10-01

    The Two-Factor Theory of job satisfaction distinguishes between intrinsic-motivation (i.e. recognition, responsibility) and extrinsic-hygiene (i.e. job security, salary, working conditions) factors. The presence of intrinsic-motivation facilitates higher satisfaction and performance, whereas the absences of extrinsic factors help mitigate against dissatisfaction. The consideration of these factors and their impact on dentists' job satisfaction is essential for the recruitment and retention of dentists. The objective of the study is to assess the level of job satisfaction of German dentists and the factors that are associated with it. This cross-sectional study was based on a job satisfaction survey. Data were collected from 147 dentists working in 106 dental practices. Job satisfaction was measured with the 10-item Warr-Cook-Wall job satisfaction scale. Organizational characteristics were measured with two items. Linear regression analyses were performed in which each of the nine items of the job satisfaction scale (excluding overall satisfaction) were handled as dependent variables. A stepwise linear regression analysis was performed with overall job satisfaction as the dependent outcome variable, the nine items of job satisfaction and the two items of organizational characteristics controlled for age and gender as predictors. The response rate was 95.0%. Dentists were satisfied with 'freedom of working method' and mostly dissatisfied with their 'income'. Both variables are extrinsic factors. The regression analyses identified five items that were significantly associated with each item of the job satisfaction scale: 'age', 'mean weekly working time', 'period in the practice', 'number of dentist's assistant' and 'working atmosphere'. Within the stepwise linear regression analysis the intrinsic factor 'opportunity to use abilities' (β = 0.687) showed the highest score of explained variance (R(2) = 0.468) regarding overall job satisfaction. With respect to the Two-Factor

  11. Systematic review: psychological morbidity in young people with inflammatory bowel disease - risk factors and impacts.

    Science.gov (United States)

    Brooks, A J; Rowse, G; Ryder, A; Peach, E J; Corfe, B M; Lobo, A J

    2016-07-01

    Psychological morbidity in young people aged 10-24 years, with inflammatory bowel disease (IBD) is increased, but risk factors for and impacts of this are unclear. To undertake a systematic literature review of the risk factors for and impact of psychological morbidity in young people with IBD. Electronic searches for English-language articles were performed with keywords relating to psychological morbidity according to DSM-IV and subsequent criteria; young people; and IBD in the MEDLINE, PsychInfo, Web of Science and CINAHL databases for studies published from 1994 to September 2014. One thousand four hundred and forty-four studies were identified, of which 30 met the inclusion criteria. The majority measured depression and anxiety symptoms, with a small proportion examining externalising behaviours. Identifiable risk factors for psychological morbidity included: increased disease severity (r(2) = 0.152, P young people with IBD were wide-ranging and included abdominal pain (r = 0.33; P young people with IBD in a range of ways, highlighting the need for psychological interventions to improve outcomes. Identified risk factors provide an opportunity to develop targeted therapies for a vulnerable group. Further research is required to examine groups under-represented in this review, such as those with severe IBD and those from ethnic minorities. © 2016 John Wiley & Sons Ltd.

  12. The Classroom Environment: A Major Motivating Factor towards High Academic Performance of Senior Secondary School Students in South West Nigeria

    Science.gov (United States)

    Akomolafe, Comfort O.; Adesua, Veronica O.

    2015-01-01

    The paper discusses the impact of the classroom environment as a motivating factor in enhancing the academic performance of secondary school students in South West Nigeria. The study adopted descriptive survey type. The population of this study comprises all students of senior secondary schools in South West Nigeria which consist of Lagos, Ogun,…

  13. Evaluation of Effective Factors on the Clinical Performance of General Surgeons in Tehran University of Medical Science, 2015

    Science.gov (United States)

    Farzianpour, Fereshteh; Mohamadi, Efat; najafpour, Zhila; Yousefinezhadi, Taraneh; Forootan, Sara; Foroushani, Abbas Rahimi

    2016-01-01

    Background and Objective: Existence of doctors with high performance is one of the necessary conditions to provide high quality services. There are different motivations, which could affect their performance. Recognizing Factors which effect the performance of doctors as an effective force in health care centers is necessary. The aim of this article was evaluate the effective factors which influence on clinical performance of general surgery of Tehran University of Medical Sciences in 2015. Methods: This is a cross-sectional qualitative-quantitative study. This research conducted in 3 phases-phases I: (use of library studies and databases to collect data), phase II: localization of detected factors in first phase by using the Delphi technique and phase III: prioritizing the affecting factors on performance of doctors by using qualitative interviews. Results: 12 articles were analyzed from 300 abstracts during the evaluation process. The output of assessment identified 23 factors was sent to surgeons and their assistants for obtaining their opinions. Quantitative analysis of the findings showed that “work qualification” (86.1%) and “managers and supervisors style” (50%) have respectively the most and the least impact on the performance of doctors. Finally 18 effective factors were identified and prioritized in the performance of general surgeons. Conclusion: The results showed that motivation and performance is not a single operating parameter and it depends on several factors according to cultural background. Therefore it is necessary to design, implementation and monitoring based on key determinants of effective interventions due to cultural background. PMID:27157161

  14. Factors affecting the performance of large-aperture microphone arrays

    Science.gov (United States)

    Silverman, Harvey F.; Patterson, William R.; Sachar, Joshua

    2002-05-01

    Large arrays of microphones have been proposed and studied as a possible means of acquiring data in offices, conference rooms, and auditoria without requiring close-talking microphones. When such an array essentially surrounds all possible sources, it is said to have a large aperture. Large-aperture arrays have attractive properties of spatial resolution and signal-to-noise enhancement. This paper presents a careful comparison of theoretical and measured performance for an array of 256 microphones using simple delay-and-sum beamforming. This is the largest currently functional, all digital-signal-processing array that we know of. The array is wall-mounted in the moderately adverse environment of a general-purpose laboratory (8 m×8 m×3 m). The room has a T60 reverberation time of 550 ms. Reverberation effects in this room severely impact the array's performance. However, the width of the main lobe remains comparable to that of a simplified prediction. Broadband spatial resolution shows a single central peak with 10 dB gain about 0.4 m in diameter at the -3 dB level. Away from that peak, the response is approximately flat over most of the room. Optimal weighting for signal-to-noise enhancement degrades the spatial resolution minimally. Experimentally, we verify that signal-to-noise gain is less than proportional to the square root of the number of microphones probably due to the partial correlation of the noise between channels, to variation of signal intensity with polar angle about the source, and to imperfect correlation of the signal over the array caused by reverberations. We show measurements of the relative importance of each effect in our environment.

  15. Factors affecting the performance of large-aperture microphone arrays.

    Science.gov (United States)

    Silverman, Harvey F; Patterson, William R; Sachar, Joshua

    2002-05-01

    Large arrays of microphones have been proposed and studied as a possible means of acquiring data in offices, conference rooms, and auditoria without requiring close-talking microphones. When such an array essentially surrounds all possible sources, it is said to have a large aperture. Large-aperture arrays have attractive properties of spatial resolution and signal-to-noise enhancement. This paper presents a careful comparison of theoretical and measured performance for an array of 256 microphones using simple delay-and-sum beamforming. This is the largest currently functional, all digital-signal-processing array that we know of. The array is wall-mounted in the moderately adverse environment of a general-purpose laboratory (8 m x 8 m x 3 m). The room has a T60 reverberation time of 550 ms. Reverberation effects in this room severely impact the array's performance. However, the width of the main lobe remains comparable to that of a simplified prediction. Broadband spatial resolution shows a single central peak with 10 dB gain about 0.4 m in diameter at the -3 dB level. Away from that peak, the response is approximately flat over most of the room. Optimal weighting for signal-to-noise enhancement degrades the spatial resolution minimally. Experimentally, we verify that signal-to-noise gain is less than proportional to the square root of the number of microphones probably due to the partial correlation of the noise between channels, to variation of signal intensity with polar angle about the source, and to imperfect correlation of the signal over the array caused by reverberations. We show measurements of the relative importance of each effect in our environment.

  16. How to Identify and Prioritize Psychosocial Factors Impacting Stress Level.

    Directory of Open Access Journals (Sweden)

    Mounia N Hocine

    Full Text Available We develop a methodological approach to identify and prioritize psychosocial factors (stressors requiring priority action to reduce stress levels. Data analysis was carried out on a random sample of 10 000 French employees who completed, during a routine interview with the occupational physician, a 25-item questionnaire about stress levels, as well as a questionnaire about 58 stressors grouped into 5 latent variables: job control, job context, relationships at work, tasks performed and recognition. Our method combines Importance-Performance Analysis, a valuable approach for prioritizing improvements in the quality of services, with Partial Least Squares-Path modeling, a Structural Equation Modeling approach widely applied in psychosocial research. Findings on our data suggest two areas worthy of attention: one with five stressors on which decision makers should concentrate, and another with five stressors that managers should leave alone when acting to reduce stress levels. We show that IPA is robust when answers to questions are dichotomized, as opposed to the initial 6-point Likert scale. We believe that our approach will be a useful tool for experts and decision-makers in the field of stress management and prevention.

  17. Impact of gestational risk factors on maternal cardiovascular system

    Science.gov (United States)

    Perales, María; Santos-Lozano, Alejandro; Luaces, María; Pareja-Galeano, Helios; Garatachea, Nuria; Barakat, Rubén; Lucia, Alejandro

    2016-01-01

    Background Scarce evidence is available on the potential cardiovascular abnormalities associated with some common gestational complications. We aimed to analyze the potential maternal cardiac alterations related to gestational complications, including body mass index (BMI) >25 kg/m2, gaining excessive weight, or developing antenatal depression. Methods The design of this study was a secondary analysis of a randomized controlled trial. Echocardiography was performed to assess cardiovascular indicators of maternal hemodynamic, cardiac remodeling and left ventricular (LV) function in 59 sedentary pregnant women at 20 and 34 weeks of gestation. Results Starting pregnancy with a BMI >25 kg/m2, gaining excessive weight, and developing antenatal depression had no cardiovascular impact on maternal health (P value >0.002). Depressed women were more likely to exceed weight gain recommendations than non-depressed women (P value <0.002). Conclusions The evaluated gestational complications seem not to induce cardiovascular alterations in hemodynamic, remodeling and LV function indicators. However, developing antenatal depression increases the risk of an excessive weight gain. This finding is potentially important because excessive weight gain during pregnancy associates with a higher risk of cardiovascular diseases (CVD) later in life. PMID:27500154

  18. Impact Factors and Prediction of Popular Topics in a Journal.

    Science.gov (United States)

    Nielsen, M B; Seitz, K

    2016-08-01

    The impact factor (IF) for 2015 was recently released and this could be the time to once again reflect on its use as a metric of a journal. Problems and concerns regarding the IF have been addressed extensively elsewhere 1 2. The principle of the IF for a given year is that it represents the average number of citations of articles published in the journal in the two previous years.While authors frequently cite the IF as a determining factor for submission, the IF does not predict how many times individual articles will be cited. In a study from a peer-reviewed cardiovascular journal, nearly half of all published articles were poorly cited, i. e., less than five citations in five years 3. A similar percentage seems to apply to our journal. In nearly all journals we estimate that the majority of citations relate to a minority of the articles. Some articles are never cited. 13 % of the articles published in our journal from 2010 to 2013 have never been cited. Even authors of poorly cited articles benefit from the IF since many institutions use the combined impact factors of their published papers to measure research activity and this may be reflected in their research budgets.The competition for the printed pages in the six annual issues of Ultraschall in der Medizin/European Journal of Ultrasound (UiM/EJU) has resulted in high rejection rates (between 80 % and 90 %). One negative review with recommendation of major revision may therefore result in rejection. Peer-review fraud where the submitting author listed recommended reviewers with fake email addresses supplying fabricated peer reviews has recently been described in the New England Journal of Medicine 4. Some of the editors of our journal believe they have experienced this as well. Fabricating reviews in order to get a high IF for an article is to be considered fraud and is inexcusable.One aspect of using impact factors as a measure of the quality of a journal is that the IF only goes back two years

  19. Factores que afectan al rendimiento en carreras de fondo. [Factors affecting long-distance running performance].

    Directory of Open Access Journals (Sweden)

    Ana Ogueta-Alday

    2016-07-01

    and runners are interested on learning about the factors that affect long-distance running performance. Facing this new reality, scientific literature has been concerned about the aforementioned factors, and the amount of studies has considerably grown. Therefore, the purpose of this review is to analyse factors affecting long-distance running performance from different points of view. Literature review was performed through 3 different databases (Medline, SportDiscus and Google Scholar and the factors were classified into 5 main groups, subdivided into different sections: 1- environmental (air/wind, temperature, humidity, altitude and slope of the ground, 2- training-related (endurance, resistance, training in hot environments and in altitude, 3- physiological (VO2max, thersholds, running economy, age, gender, muscle fibre type, fatigue and race, 4- biomechanical (anthropometry, leg-stiffness, flexibility, foot strike pattern, footwear, foot orthoses and spatio-temporal parameters and 5- psychological (intervention strategies, direction of attention and music. Even though the influence of some of these factors on running performance in quite well-known, the influence of some psychological (direction of attention and music and biomechanical factors (foot strike pattern and spatio-temporal parameters is still unclear. There are few studies or the results cannot be generalized. Future studies and the progress of new technologies and measurement tools will provide a better understanding.

  20. Factors affecting student performance in an undergraduate genetics course.

    Science.gov (United States)

    Bormann, J Minick; Moser, D W; Bates, K E

    2013-05-01

    The objective of this study was to determine some of the factors that affect student success in a genetics course. Genetics for the Kansas State University College of Agriculture is taught in the Department of Animal Sciences and Industry and covers Mendelian inheritance, molecular genetics, and quantitative/population genetics. Data collected from 1,516 students over 7 yr included year and semester of the course; age; gender; state of residence; population of hometown; Kansas City metro resident or not; instructor of course; American College Testing Program (ACT) scores; number of transfer credits; major; college; preveterinary student or not; freshman, sophomore, junior, and senior grade point average (GPA); semester credits when taking genetics; class standing when enrolled in genetics; cumulative GPA before and after taking genetics; semester GPA in semester taking genetics, number of semesters between the biology prerequisite and genetics; grade in biology; location of biology course; and final percentage in genetics. Final percentage in genetics did not differ due to instructor, gender, state of residence, major, or college (P > 0.16). Transfer students tended to perform better than nontransfer students (P = 0.09), and students from the Kansas City metro outscored students from other areas (P = 0.03). Preveterinary option students scored higher in genetics than non-preveterinary students (P genetics (P = 0.06). Students who took biology at Kansas State University performed better in genetics than students who transferred the credit (P genetics (P genetics, students should take biology from Kansas State, perform well in biology, and wait until at least sophomore standing to enroll in genetics.

  1. Childhood bruxism: Related factors and impact on oral health-related quality of life.

    Science.gov (United States)

    Antunes, Lívia Azeredo Alves; Castilho, Thuanny; Marinho, Marcello; Fraga, Renato Silva; Antunes, Leonardo Santos

    2016-01-01

    This study aimed to assess childhood bruxism relating associated factors and the bruxism's impact on oral health-related quality of life (OHRQoL). A case-control study was performed with 3- to 6-year-old children obtained from public preschools in Brazil. The case and control groups had 21 and 40 children, respectively. Associations between bruxism and respiratory problems (p = 0.04, OR: 0.33, CI: 0.09 to 1.14), dental wear (p 0.05). The association between presence and absence of impact with bruxism or other variables showed no statistical relationship (p > 0.05). It could be concluded that childhood bruxism is related to respiratory problems, dental wear, dental caries, and malocclusion. Despite being a topic that demands special care in dentistry, bruxism does not significantly affect the OHRQoL.

  2. An assessment of South Africa's research journals: Impact factors, Eigenfactors and structure of editorial boards

    Directory of Open Access Journals (Sweden)

    Androniki E.M. Pouris

    2015-03-01

    Full Text Available Scientific journals play an important role in academic information exchange and their assessment is of interest to science authorities, editors and researchers. The assessment of journals is of particular interest to South African authorities as the country's universities are partially funded according to the number of publications they produce in accredited journals, such as the Thomson Reuters indexed journals. Scientific publishing in South Africa has experienced a revolution during the last 10 years. Our objective here is to report the performance of the country's journals during 2009 and 2010 according to a number of metrics (i.e. impact factors, Eigenfactors and the international character of editorial boards; to identify and compare the impact of the South African journals that have been recently added to the Thomson Reuters' Journal Citation Reports; and to elaborate on issues related to science policy.

  3. Correction factors for safe performance of API X65 pipeline steel

    Energy Technology Data Exchange (ETDEWEB)

    Hashemi, Sayyed H. [Department of Mechanical Engineering, the University of Birjand, P.O. Box 97175/615, Birjand (Iran, Islamic Republic of)], E-mail: shhashemi@birjand.ac.ir

    2009-08-15

    Prediction of required Charpy energy for fracture arrest is vital for safe performance of gas transportation pipelines. This is commonly estimated through failure models calibrated in the past on fracture data from combined Charpy tests and full-thickness burst experiments. Unfortunately, such pipeline failure models are unable to correctly predict the minimum arrest toughness of thermo-mechanical controlled rolled (TMCR) steels. To refine the existing failure models, different empirical adjustments have been proposed in recent years. In this paper, similar correction factors were derived from fracture information of instrumented Charpy impact tests on API X65 steel. The contribution of different fracture mechanisms of impact test specimens was determined through energy partitioning analysis. Parts of the energy contribution were correlated then to the source of uncertainty observed in similar experiments. The applied technique was similar to that of previous studies on X70 and X100 steels, and proved to be encouraging in giving consistent results compared to available test data.

  4. Impact of TQM and Technology Management on Organizational Performance

    Directory of Open Access Journals (Sweden)

    MUHAMMAD TASLEEM

    2016-10-01

    Full Text Available In the growing business competitiveness TQM (Total Quality Management and TM (Technology Management practices have become important for organizational success. TQM fosters business excellence while TM helps to deal with process and product related technological challenges. However, in literature TM has received little consideration with TQM. This paper is a research study that attempts to identify any combined relationship of both concepts with OP (Organizational Performance while taking into account different organizational contextual factors including ISO-9001 certification. Responses from 86 different organizations in Pakistan are collected through questionnaire survey and random sampling. Statistical analysis shows that OP is positively associated to TQM and TM. Results of this study indicate the significance of ISO-9001 certification for TQM but do not support it for OP. It is also observed that organizations of private sector are significantly better in TQM and TM practices, so in OP, in comparison to government or public sector organizations. The study contributes to explore and augment both practices for implementation to improve OP.

  5. Impact of joint resource partitioning and routing on performance of relay enhanced cellular networks

    Institute of Scientific and Technical Information of China (English)

    LIU Tao; RONG Meng-tian; SHI Hong-kui

    2008-01-01

    Radio resource assignment schemes and routing strategies in relay enhanced cellular networks are proposed in this paper. Under the reuse partitioning-based frequency planning framework, the intra-cell re-source partitioning between the base station and relay nodes was addressed firstly by introducing a metric of ef-fective reuse factor. Then, coverage-oriented and capacity-oriented routings, as well as two link bandwidth as-signment schemes" equal-bandwidth per link" and " equal-bandwidth per mobile station" were developed.These key issues and their impacts on the system performance were analyzed comprehensively and supported by simulations. Results show that the cell capacity and edge user throughput of the proposed network are superior to the traditional non-relay network when an appropriate effective reuse factor is adopted.

  6. Impact phenomena as factors in the evolution of the Earth

    Science.gov (United States)

    Grieve, R. A. F.; Parmentier, E. M.

    1984-01-01

    It is estimated that 30 to 200 large impact basins could have been formed on the early Earth. These large impacts may have resulted in extensive volcanism and enhanced endogenic geologic activity over large areas. Initial modelling of the thermal and subsidence history of large terrestrial basins indicates that they created geologic and thermal anomalies which lasted for geologically significant times. The role of large-scale impact in the biological evolution of the Earth has been highlighted by the discovery of siderophile anomalies at the Cretaceous-Tertiary boundary and associated with North American microtektites. Although in neither case has an associated crater been identified, the observations are consistent with the deposition of projectile-contaminated high-speed ejecta from major impact events. Consideration of impact processes reveals a number of mechanisms by which large-scale impact may induce extinctions.

  7. Performance of Quantization Factor in H.261 Video Coding

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The quantizaion factor through buffer pure occupy algorithm isprovided. Through the simulation, firstly the relationship between quantization factor and compression ratio is analyzed, secondly the PSNR of the image with the quantization factor is discussed, and finally the control to the output rate of the coder by adjusting the value of quantization factor is studied.

  8. Physiological and biomechanical factors associated with elite endurance cycling performance.

    Science.gov (United States)

    Coyle, E F; Feltner, M E; Kautz, S A; Hamilton, M T; Montain, S J; Baylor, A M; Abraham, L D; Petrek, G W

    1991-01-01

    In this study we evaluated the physiological and biomechanical responses of "elite-national class" (i.e., group 1; N = 9) and "good-state class" (i.e., group 2; N = 6) cyclists while they simulated a 40 km time-trial in the laboratory by cycling on an ergometer for 1 h at their highest power output. Actual road racing 40 km time-trial performance was highly correlated with average absolute power during the 1 h laboratory performance test (r = -0.88; P less than 0.001). In turn, 1 h power output was related to each cyclists' VO2 at the blood lactate threshold (r = 0.93; P less than 0.001). Group 1 was not different from group 2 regarding VO2max (approximately 70 ml.kg-1.min-1 and 5.01 l.min-1) or lean body weight. However, group 1 bicycled 40 km on the road 10% faster than group 2 (P less than 0.05; 54 vs 60 min). Additionally, group 1 was able to generate 11% more power during the 1 h performance test than group 2 (P less than 0.05), and they averaged 90 +/- 1% VO2max compared with 86 +/- 2% VO2max in group 2 (P = 0.06). The higher performance power output of group 1 was produced primarily by generating higher peak torques about the center of the crank by applying larger vertical forces to the crank arm during the cycling downstroke. Compared with group 2, group 1 also produced higher peak torques and vertical forces during the downstroke even when cycling at the same absolute work rate as group 2. Factors possibly contributing to the ability of group 1 to produce higher "downstroke power" are a greater percentage of Type I muscle fibers (P less than 0.05) and a 23% greater (P less than 0.05) muscle capillary density compared with group 2. We have also observed a strong relationship between years of endurance training and percent Type I muscle fibers (r = 0.75; P less than 0.001). It appears that "elite-national class" cyclists have the ability to generate higher "downstroke power", possibly as a result of muscular adaptations stimulated by more years of endurance

  9. [The impact factor: a factor of impact or the impact of a (sole) factor? The limits of a bibliometric indicator as a candidate for an instrument to evaluate scientific production].

    Science.gov (United States)

    Gensini, G F; Conti, A A

    1999-01-01

    The Impact Factor is a bibliometric quantitative parameter introduced in 1971 and used to evaluate, classify and compare scientific journals. It is essentially the ratio between the number of citations they receive, computed on the basis of those included in the Science Citation Index, and the number of published articles. It is thus a dynamic parameter and an indicator of the editorial quality of a journal. It has also been considered a putative index of the scientific production of a single author. The Impact Factor was first proposed as a useful instrument for planning library choices, programming personal journal buying and reading, and directing scientific journal editors in their editorial strategies. However, since among the numerous variables which may influence the Impact Factor there are such parameters as: the average number of bibliographical references in a single article, self-citations, "salami publications", the Impact Factor, though adequate to judge entities such as journals, institutions and whole scientific communities, seems on the contrary inadequate to evaluate accurately the quality of the single investigator, paper, and research group. Furthermore, a limited number of papers, all focused on the so-called "hot topics", may contribute to increase the Impact Factor of a single journal. There is therefore still much research to be done to find truly "objective" methods to evaluate critically the "quality" (and not only the "quantity") of the work of a single author, a scientific group, and an entire institution, so that not only quantitative, but also qualitative evidence may be acquired!

  10. Human factors issues in performing life science experiments in a 0-G environment

    Science.gov (United States)

    Gonzalez, Wayne

    1989-01-01

    An overview of the environmental conditions within the Spacelab and the planned Space Station Freedom is presented. How this environment causes specific Human Factors problems and the nature of design solutions are described. The impact of these problems and solutions on the performance of life science activities onboard Spacelab (SL) and Space Station Freedom (SSF) is discussed. The first area highlighted is contamination. The permanence of SSF in contrast to the two-week mission of SL has significant impacts on crew and specimen protection requirements and, thus, resource utilization. These requirements, in turn impose restrictions on working volumes, scheduling, training, and scope of experimental procedures. A second area is microgravity. This means that all specimens, materials, and apparatus must be restrained and carefully controlled. Because so much of the scientific activity must occur within restricted enclosures (gloveboxes), the provisions for restraint and control are made more complex. The third topic is crewmember biomechanics and the problems of movement and task performance in microgravity. In addition to the need to stabilize the body for the performance of tasks, performance of very sensitive tasks such as dissection is difficult. The issue of space sickness and adaption is considered in this context.

  11. OPERATIONAL AND COMPOSITIONAL FACTORS THAT AFFECT THE PERFORMANCE PROPERTIES OF ARP/MCU SALTSTONE GROUT

    Energy Technology Data Exchange (ETDEWEB)

    Reigel, M.; Edwards, T.; Pickenheim, B.

    2012-02-15

    The Saltstone Production Facility (SPF) receives low level waste (LLW) salt solution from Tank 50H for treatment and disposal. Tank 50H receives transfers from the Effluent Treatment Project (ETP), the H-Canyon General Purpose Evaporator, and the Actinide Removal Process/Modular Caustic Side Solvent Extraction Unit (ARP/MCU) Decontaminated Salt Solution Hold Tank (DSS-HT). At the SPF, the LLW is mixed with premix (a cementitious mixture of portland cement (PC), blast furnace slag (BFS) and Class F fly ash (FA)) in a Readco mixer to produce fresh (uncured) saltstone that is transferred to the Saltstone Disposal Facility (SDF) vaults. The saltstone formulation (mix design) must produce a grout waste form that meets both placement and performance properties. In previous simulated saltstone studies, multiple compositional factors were identified that drive the performance properties of saltstone made from the projected ARP/MCU salt solution. This composition was selected as salt solution simulant since ARP/MCU is the primary influent into Tank 50H. The primary performance property investigated was hydraulic conductivity since it is a variable input property to the saltstone Performance Assessment (PA) transport model. In addition, the porosity, also referred to as void structure, is another variable that impacts the PA response. In addition, Young's modulus and cured density are other performance properties analyzed in this report; however they are indicators of the performance of saltstone and not direct inputs into the PA. The data from previous studies showed that the largest impact on the performance properties of saltstone was due to curing temperature, followed by aluminate concentration in the salt solution, water to premix ratio and premix composition. However, due to the scope of the previous studies, only a few mixes were cured and analyzed at higher temperatures. The samples cured at 60 C had an increased hydraulic conductivity of approximately 600

  12. The impact of the impact factor ¿myth or reality?.

    Directory of Open Access Journals (Sweden)

    Fidias E. Leon Sarmiento

    2009-11-01

    Full Text Available The evaluation of scientific production in Latin America has had several eras being the numerical impact factor (FIN the one that became the most popular one in recent years; unfortunately, the FIN measures journal popularity more than journal prestige. Thus, a lot of idiomatic, mathematical and scientific biases prevent the use of the FIN as a Latin American bibliometric measurement. New scienciometric methods such as webometrics and the like developed in more scientific way that than obtained by the Institute of Scientific Information must be considered from now on. It includes the Page Rank and the Y Factor both of which seem to give more consistent results than those obtained with the FIN. Due to this, it is mandatory to continue the analysis and, hopefully, to get a re-evaluation of the FIN as an universal scienciometric measure, mostly in Spanish-speaking countries as it has already been advanced in some academic and scientific circles of the so-called first world.

  13. Which factors are associated with difficult surgical extraction of impacted lower third molars?

    OpenAIRE

    Park, Kyeong-Lok

    2016-01-01

    Objectives The aim of this retrospective study was to investigate factors associated with increased difficulty in the surgical extraction of impacted lower third molars and to improve identification of difficult cases. Materials and Methods A total of 680 patients who required 762 surgical extractions of impacted lower third molars from 2009 to 2014 were enrolled in the study. Demographic factors, clinical factors, radiographic factors, surgical extraction difficulty, and presumed causes of d...

  14. Impact of the internet on academic performance of students in ...

    African Journals Online (AJOL)

    Information Impact: Journal of Information and Knowledge Management ... Journal Home > Vol 5, No 2 (2014) > ... and that they consult the internet in order to retrieve relevant academic materials, majority of the students rated the internet for ...

  15. Performance of Used Tire Cushion Layer under Rockfall Impact

    Directory of Open Access Journals (Sweden)

    Jianhu Sun

    2016-01-01

    Full Text Available Rock shed is widely used in traffic lines against rockfall. In order to cushion rockfall impact and dissipate impact energy, cushion layer is usually adopted in rock shed. Used tire cushion layer is proposed in this paper and it can cushion rockfall impact utilizing large radial deformation of tire. Reinforced concrete structure model is built with used tire cushion layer and artificial rockfall test is carried out. Twelve tests are divided into 4 sets with different rockfall mass, rockfall height, and tire filling material. Simplified calculation model with spring-damper is derived from radial repeated compression test of used tire, which improves the calculation efficiency. Test and numerical simulation show that application of used tire cushion layer in rock shed can cushion rockfall impact and effectively reduce peak acceleration and the maximum impact force. Filling sand and gravel in tire can improve tire stiffness and energy absorption capacity but will decrease cushion effect due to its large density. With the same impact energy, light rockfall is more destructive than weight rockfall for used tire cushion layer.

  16. An analysis of factors that impact secondary science outcomes in Tennessee

    Science.gov (United States)

    South, Suzanne Lawson

    The purpose of this study was to analyze school and district characteristics for 2005--2006 through 2007--2008 to determine which factors impacted science achievement for the graduating class of 2008--2009 in Tennessee. School size, socioeconomic status, per pupil instructional expenditures and rurality/urbanicity were predictor variables. Achievement was represented by performance on the science and reasoning portion of the ACT. Correlational studies indicated that socioeconomic status had a significant impact on science achievement while the impact of school size and rurality/urbanicity was observed to be weak. Statistical analyses through multiple linear regression produced a model in which socioeconomic status and rurality/urbanicity explained 65.4% of the variance observed. Schools were segmented into quintiles based on socioeconomic status in an effort to control for poverty and correlational studies were repeated. School size and rurality/urbanicity appeared to have a more significant impact on achievement, particularly for students in the highest and lowest poverty bands.

  17. Impact of Bony Stress Injuries on Professional Basketball Performance

    Science.gov (United States)

    Khan, Moin; Madden, Kim; Rogowski, Joseph P.; Stotts, Jeff; Burrus, Matthew Tyrrell; Samani, Marisa; Sikka, Robby Singh; Bedi, Asheesh

    2017-01-01

    Objectives: Players in the National Basketball Association (NBA) subject their lower extremities to significant repetitive loading during the season as well as during off-season training. Little is known about the incidence and impact of lower extremity bony stress injuries in these athletes. Methods: Using the player injury database maintained by the NBA Players’ Association, all bony stress injuries from 1992 to May 2016 were identified. Those not involving the lower extremity were excluded from the study. Stress fractures and stress reactions were grouped together. Number of games missed due to the injury as well as player statistics including points per game (ppg), assists per game (apg), steals per game (spg), and blocks per game (bpg) were collected from two years prior to the injury to two years after the injury. Results: 76 lower extremity bony stress injuries were identified involving 75 different NBA players with an average player age of 25.4 ± 4.1 years. 55.3% (42/76) involved the foot, 21.1% (16/76) involved the ankle or fibula, 17.1% (13/76) involved the tibia, and 6.6% (5/76) involved either the knee or patella. The majority of injuries occurred in season 82.9% (63/76) with half of the injuries occurring within the first 6 weeks of the season. 38.2% (29/76) of these injuries were managed surgically. An average of 25.1 ± 21.3 games were missed. 19.7% (15/76) of patients who sustained a stress fracture also had a subsequent injury. 29.2% (21/76) of players were not able to return to professional basketball after the season in which the injury was sustained; however, those who were able to return to the same level of play did not see a significant change in performance as measured by ppg, apg, spg, or bpg when comparing the season prior to the injury and either one or two years after the injury. Stress injuries to the foot carried the worst prognosis, 57.1% (12/21) of those unable to return to professional basketball sustained such an injury

  18. Impact of chronic neonicotinoid exposure on honeybee colony performance and queen supersedure.

    Directory of Open Access Journals (Sweden)

    Christoph Sandrock

    Full Text Available BACKGROUND: Honeybees provide economically and ecologically vital pollination services to crops and wild plants. During the last decade elevated colony losses have been documented in Europe and North America. Despite growing consensus on the involvement of multiple causal factors, the underlying interactions impacting on honeybee health and colony failure are not fully resolved. Parasites and pathogens are among the main candidates, but sublethal exposure to widespread agricultural pesticides may also affect bees. METHODOLOGY/PRINCIPAL FINDINGS: To investigate effects of sublethal dietary neonicotinoid exposure on honeybee colony performance, a fully crossed experimental design was implemented using 24 colonies, including sister-queens from two different strains, and experimental in-hive pollen feeding with or without environmentally relevant concentrations of thiamethoxam and clothianidin. Honeybee colonies chronically exposed to both neonicotinoids over two brood cycles exhibited decreased performance in the short-term resulting in declining numbers of adult bees (-28% and brood (-13%, as well as a reduction in honey production (-29% and pollen collections (-19%, but colonies recovered in the medium-term and overwintered successfully. However, significantly decelerated growth of neonicotinoid-exposed colonies during the following spring was associated with queen failure, revealing previously undocumented long-term impacts of neonicotinoids: queen supersedure was observed for 60% of the neonicotinoid-exposed colonies within a one year period, but not for control colonies. Linked to this, neonicotinoid exposure was significantly associated with a reduced propensity to swarm during the next spring. Both short-term and long-term effects of neonicotinoids on colony performance were significantly influenced by the honeybees' genetic background. CONCLUSIONS/SIGNIFICANCE: Sublethal neonicotinoid exposure did not provoke increased winter losses. Yet

  19. Impact of haze-fog days to radon progeny equilibrium factor and discussion of related factors.

    Science.gov (United States)

    Hou, Changsong; Shang, Bing; Zhang, Qingzhao; Cui, Hongxing; Wu, Yunyun; Deng, Jun

    2015-11-01

    The equilibrium factor F between radon and its short-lived progenies is an important parameter to estimate radon exposure of humans. Therefore, indoor and outdoor concentrations of radon and its short-lived radon progeny were measured in Beijing area using a continuously measuring device, in an effort to obtain information on the F value. The results showed that the mean values of F were 0.58 ± 0.13 (0.25-0.95, n = 305) and 0.52 ± 0.12 (0.31-0.91, n = 64) for indoor and outdoor, respectively. The indoor F value during haze-fog days was higher than the typical value of 0.4 recommended by the United Nations Scientific Committee on the Effects of Atomic Radiation, and it was also higher than the values of 0.47 and 0.49 reported in the literature. A positive correlation was observed between indoor F values and PM2.5 concentrations (R (2) = 0.71). Since 2013, owing to frequent heavy haze-fog events in Beijing and surrounding areas, the number of the days with severe pollution remains at a high level. Future studies on the impact of the ambient fine particulate matter on indoor radon progeny equilibrium factor F could be important.

  20. AN EMPIRICAL EXAMINATION OF QUALITY TOOLS IMPACT ON FINANCIAL PERFORMANCES: EVIDENCE FROM SERBIA

    Directory of Open Access Journals (Sweden)

    Vesna Spasojević Brkić

    2012-02-01

    Full Text Available This study examines the impact of quality tools on financial performances using a sample of 119Serbian industrial firms. Factor and reliability analysis are used to show that quality tools may beclassified into three primary categories: quality tools for reviewing current conditions (for decisionmaking, quality tools for analyzing current conditions (for problems solving and quality tools forproduction planning and control (for improvement. The relationships between these 3 groups ofquality tools and financial performances were tested using the stepwise regression analysis. It wasconcluded that the first group of quality tools (quality tools for reviewing current condition, e.g. fordecision making has significant impact on most of the dimensions of financial performances, whilefor the second and third group there is no statistical support. Influence of the first group of qualitytools on sales revenue is statistically significant at a p<0.01 significance level while it`s influence oncompany profit and total revenue per employee are statistically significant at p<0.05 significancelevel. The model ranged from 4% to 7%.

  1. The Impacts of Human Resource Management Practices on the Performance of Enterprises in Abidjan (Cote d'Ivoire)

    Institute of Scientific and Technical Information of China (English)

    K.Ezane Joseph; DAI Chang-jun

    2009-01-01

    In this paper, we theorize about the impacts of human resource management ( HRM ) practices on enterprises' performance in Abidjan (Cote d'Ivoire). Specifically, we emphasize the correlation between HRM practices and the perceived enterprise performance. A factor analysis of different HRM practices was utilized. The exploratory factor analysis on the HRM practices for managerial employees revealed three HRM dimensions: employee development, feedback systems, and pay/ organization. A separate factor analysis for HRM practices for non-managerial employees led to the same conclusions. These three factors resemble those obtained in previous empirical study and discussed in the theoretical HRM literature. Therefore, the relationship among these three HRM dimensions and their relationship with enterprise performance was examined in the present study to facilitate comparison between managerial and non-managerial employees in the Ivorian context.

  2. Factors Influencing the Performance of German Food SME Formal Networks

    Directory of Open Access Journals (Sweden)

    Jivka Deiters

    2014-08-01

    Full Text Available The food sector in Europe can be characterized as a complex, global and dynamically changing network of trade streams, food supply network relations and related product flows which offers a big spectrum for economic output and employment. Innovation is important for the competitiveness of the food industry that is to a large extent comprised of small and medium sized enterprises (SMEs. For them, innovation has grown extremely subordinate to interaction in networks. Network initiatives that could provide appropriate support involve social interaction and knowledge exchange, learning and competence development, and coordination (organization and management ofimplementation. This paper is designed to assess the factors that affect the performance of German food SME formal networks. It also addresses the consequences at the network and macro level. The analysis was explored by using the laddering technique based on the means‐end chain theory. The findings will help to build up a “network learning toolbox” that is adapted to the particular requirements of the different target groups such as of SMEs, network managers and policy makers. The “network learning toolbox” should improve network learning, which is adriver for improvements in innovation, economic growth and sustainable competitive advantage for food SMEs.

  3. Normalized impact factor (NIF): an adjusted method for calculating the citation rate of biomedical journals.

    Science.gov (United States)

    Owlia, P; Vasei, M; Goliaei, B; Nassiri, I

    2011-04-01

    The interests in journal impact factor (JIF) in scientific communities have grown over the last decades. The JIFs are used to evaluate journals quality and the papers published therein. JIF is a discipline specific measure and the comparison between the JIF dedicated to different disciplines is inadequate, unless a normalization process is performed. In this study, normalized impact factor (NIF) was introduced as a relatively simple method enabling the JIFs to be used when evaluating the quality of journals and research works in different disciplines. The NIF index was established based on the multiplication of JIF by a constant factor. The constants were calculated for all 54 disciplines of biomedical field during 2005, 2006, 2007, 2008 and 2009 years. Also, ranking of 393 journals in different biomedical disciplines according to the NIF and JIF were compared to illustrate how the NIF index can be used for the evaluation of publications in different disciplines. The findings prove that the use of the NIF enhances the equality in assessing the quality of research works produced by researchers who work in different disciplines.

  4. The impact of roofing material on building energy performance

    Science.gov (United States)

    Badiee, Ali

    , fenestration, etc. and their thermal insulation energy performance value will not be included this study. Five different UAB campus buildings with the same reinforced concrete structure (RC Structure), each having a different roofing material were selected, surveyed, analyzed, and evaluated in this study. Two primary factors are considered in this evaluation: the energy consumption and utility bills. The data has been provided by the UAB Facilities Management Department and has been monitored from 2007 to 2013 using analysis of variance (ANOVA) and t-test methods. The energy utilities examined in this study involved electricity, domestic water, and natural gas. They were measured separately in four different seasons over a seven-year time period. The building roofing materials consisted of a green roof, a white (reflective) roof, a river rock roof, a concrete paver roof, and a traditional black roof. Results of the tested roofs from this study indicate that the white roof is the most energy efficient roofing material.

  5. Scopus's Source Normalized Impact per Paper (SNIP) versus a Journal Impact Factor based on Fractional Counting of Citations

    CERN Document Server

    Leydesdorff, Loet

    2010-01-01

    Impact factors (and similar measures such as the Scimago Journal Rankings) suffer from two problems: (i) citation behavior varies among fields of science and therefore leads to systematic differences, and (ii) there are no statistics to inform us whether differences are significant. The recently introduced SNIP indicator of Scopus tries to remedy the first of these two problems, but a number of normalization decisions are involved which makes it impossible to test for significance. Using fractional counting of citations-based on the assumption that impact is proportionate to the number of references in the citing documents-citations can be contextualized at the paper level and aggregated impacts of sets can be tested for their significance. It can be shown that the weighted impact of Annals of Mathematics (0.247) is not so much lower than that of Molecular Cell (0.386) despite a five-fold difference between their impact factors (2.793 and 13.156, respectively).

  6. The impacts of anthropogenic factors on the environment in Nigeria.

    Science.gov (United States)

    Madu, Ignatius A

    2009-03-01

    Generally speaking, there has been a consensus on the primary drivers of anthropogenic induced environmental degradation. However, little progress has been made in determining the magnitude of the impacts, particularly in developing countries. This creates a lacuna that needs to be filled up. The purpose of this study therefore is to ascertain the degree of anthropogenic induced environmental impacts in Nigeria. To achieve the aim, fossil fuel consumption was used as a surrogate for carbon dioxide emissions while the magnitude of the impacts was determined by regression statistics and the STIRPAT model. The results show that only three variables, namely population, affluence and urbanization, were statistically significant and that the regression model accounts for 60% of the variation in the environmental impacts. However, population and affluence, which have ecological elasticities of 1.699 and 2.709, respectively, are the most important anthropogenic drivers of environmental impacts in Nigeria while urbanization, with an elasticity of -0.570, reduces the effect of the impacts. This implies that modernization brings about a reduction in environmental impacts. The paper therefore makes a significant contribution to knowledge by successfully testing the STIRPAT model in this part of the world and by being the first application of the model at political units below the regional or nation states.

  7. Identifying Critical Success Factors for TQM and Employee Performance in Malaysian Automotive Industry: A Literature Review

    Science.gov (United States)

    Nadia Dedy, Aimie; Zakuan, Norhayati; Zaidi Bahari, Ahamad; Ariff, Mohd Shoki Md; Chin, Thoo Ai; Zameri Mat Saman, Muhamad

    2016-05-01

    TQM is a management philosophy embracing all activities through which the needs and expectations of the customer and the community and the goals of the companies are satisfied in the most efficient and cost effective way by maximizing the potential of all workers in a continuing drive for total quality improvement. TQM is very important to the company especially in automotive industry in order for them to survive in the competitive global market. The main objective of this study is to review a relationship between TQM and employee performance. Authors review updated literature on TQM study with two main targets: (a) evolution of TQM considering as a set of practice, (b) and its impacts to employee performance. Therefore, two research questions are proposed in order to review TQM constructs and employee performance measure: (a) Is the set of critical success factors associated with TQM valid as a whole? (b) What is the critical success factors should be considered to measure employee performance in automotive industry?

  8. Comparison of Journal Citation Reports and Scopus Impact Factors for Ecology and Environmental Sciences Journals

    Science.gov (United States)

    Gray, Edward; Hodkinson, Sarah Z.

    2008-01-01

    Impact factors for journals listed under the subject categories "ecology" and "environmental sciences" in the Journal Citation Reports database were calculated using citation data from the Scopus database. The journals were then ranked by their Scopus impact factor and compared to the ranked lists of the same journals derived from Journal…

  9. Comparison of Journal Citation Reports and Scopus Impact Factors for Ecology and Environmental Sciences Journals

    Science.gov (United States)

    Gray, Edward; Hodkinson, Sarah Z.

    2008-01-01

    Impact factors for journals listed under the subject categories "ecology" and "environmental sciences" in the Journal Citation Reports database were calculated using citation data from the Scopus database. The journals were then ranked by their Scopus impact factor and compared to the ranked lists of the same journals derived from Journal…

  10. Not So Fast: Inflation in Impact Factors Contributes to Apparent Improvements in Journal Quality

    Science.gov (United States)

    Neff, Bryan D.; Olden, Julian D.

    2010-01-01

    The Institute for Scientific Information (ISI) impact factor has become an important standard for assessing journal quality. Here we propose that impact factors may be subject to inflation analogous to changes in monetary prices in economics. The possibility of inflation came to light as a result of the observation that papers published today tend…

  11. What does the Web of Science fi ve-year synchronous impact factor have to offer?

    Institute of Scientific and Technical Information of China (English)

    Ronald; Rousseau

    2009-01-01

    With a random sample of 10 JCR(Science)subject areas it is shown that the2-year and the 5-year impact factor of journals lead statistically to the same ranking per category.Yet in a majority of cases,the 5-year impact factor is larger than the 2-year one.

  12. Some Comments on Egghe’s Derivation of the Impact Factor Distribution

    NARCIS (Netherlands)

    L. Waltman (Ludo); N.J.P. van Eck (Nees Jan)

    2009-01-01

    textabstractIn a recent paper, Egghe [Egghe, L. (in press). Mathematical derivation of the impact factor distribution. Journal of Informetrics] provides a mathematical analysis of the rank-order distribution of journal impact factors. We point out that Egghe’s analysis relies on an unrealistic assum

  13. Studying Overseas: Factors Impacting Intention of Female Students in Mainland China

    Science.gov (United States)

    Zhang, Yi; Sun, Jie; Hagedorn, Linda Serra

    2013-01-01

    The purpose of this study was to investigate the factors that impact Chinese female students' intention to study overseas. This study also aimed to understand how these factors impact female students' decision making process. Using a survey questionnaire, data were collected from 96 female undergraduates who enrolled in a 4-year public university…

  14. Factors potentially influencing academic performance among medical students

    Directory of Open Access Journals (Sweden)

    Al Shawwa L

    2015-01-01

    Full Text Available Lana Al Shawwa,1 Ahmad A Abulaban,2 Abdulrhman A Abulaban,3 Anas Merdad,3 Sara Baghlaf,3 Ahmed Algethami,3 Joullanar Abu-shanab,3 Abdulrahman Balkhoyor3 1Department of Medical Education, College of Medicine, King Abdulaziz University, Jeddah, 2Department of Medicine-Neurology, King Fahad National Guard Hospital, King Abdulziz Medical City, Riyadh, 3Department of Medical Education, College of Medicine, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia Background: Studies are needed to examine predictors of success in medical school. The aim of this work is to explore factors that potentially influence excellence of medical students. Methods: The study was conducted in the Medical Faculty of King Abdulaziz University during October 2012. A self-administered questionnaire was used. Medical students with a grade point average (GPA ≥4.5 (out of 5 were included and compared to randomly selected medical students with a GPA <4.5, who were available at the time of the study. Results: A total of 359 undergraduate students participated in the study. 50.4% of the sample was students with a GPA ≥4.5. No statistically significant difference regarding the time spent on outings and social events was found. However, 60.7% of high GPA students spend less than 2 hours on social networking per day as compared to 42.6% of the lower GPA students (P<0.01. In addition, 79% of high GPA students prefer to study alone (P=0.02, 68.0% required silence and no interruptions during studying time (P=0.013, and 47% revise their material at least once before an exam (P=0.02. Conclusion: Excellent medical students have many different characteristics. For example, they do not use social networking for prolonged periods of time, and they have strong motivation and study enjoyment. Further studies are needed to examine whether these differences have a real impact on GPA or not. Keyword: King Abdulaziz University KAU, medical school, study habits, exam habits 

  15. Do hospital factors impact readmissions and mortality after colorectal resections at minority-serving hospitals?

    Science.gov (United States)

    Hechenbleikner, Elizabeth M; Zheng, Chaoyi; Lawrence, Samuel; Hong, Young; Shara, Nawar M; Johnson, Lynt B; Al-Refaie, Waddah B

    2017-03-01

    Minority-serving hospitals have greater readmission rates after operative procedures including colectomy; however, little is known about the contribution of hospital factors to readmission risk and mortality in this setting. This study evaluated the impact of hospital factors on readmissions and inpatient mortality after colorectal resections at minority-serving hospitals in the context of patient- and procedure-related factors. More than 168,000 patients who underwent colorectal resections in 374 California hospitals (2004-2011) were analyzed using the State Inpatient Database and American Hospital Association Hospital Survey data. Sequential logistic regression analyses were performed to determine the associations between minority-serving hospital status and 30-day, 90-day, and repeated readmissions. Thirty-day, 90-day, and repeated readmission rates were 11.2%, 16.9%, and 2.9%, respectively. Odds for 30-day, 90-day, and repeated readmissions after colorectal resections were 19%, 20%, and 38% more likely at minority-serving hospitals versus non-minority-serving hospitals, respectively (P hospitals while hospital-level factors contributed roughly 40%. Inpatient mortality was significantly greater at minority-serving hospitals versus non-minority-serving hospitals (4.9% vs 3.8%; P hospitals while hospital factors were less contributory. These findings need to be further validated to shape quality improvement interventions to decrease readmissions. Copyright © 2016 Elsevier Inc. All rights reserved.

  16. Astigmatism Impact on Visual Performance: Meridional and Adaptational Effects

    National Research Council Canada - National Science Library

    Vinas, Maria; de Gracia, Pablo; Dorronsoro, Carlos; Sawides, Lucie; Marin, Gildas; Hernández, Martha; Marcos, Susana

    2013-01-01

    .... However, the extent to which prior adaptation to astigmatism affects visual performance, whether this effect is axis dependent, and the time scale of potential changes in visual performance after...

  17. The effect of social media (#SoMe) on journal impact factor and parental awareness in paediatric urology.

    Science.gov (United States)

    O'Kelly, F; Nason, G J; Manecksha, R P; Cascio, S; Quinn, F J; Leonard, M; Koyle, M A; Farhat, W; Leveridge, M J

    2017-04-21

    Social media (SoMe) comprises a number of internet-based applications that have the capability to disseminate multimodal media and allow for unprecedented inter-user connectivity. The role of Twitter has been studied in conferences and education; moreover, there is increasing evidence that patients are more likely to use social media for their own health education. The aim of this study was to assess the impact of social media platforms on the impact factor of both urological and paediatric journals that publish on paediatric urology, and to assess parental awareness of social media in paediatric urology. A filtered Journal of Citation Reports (JCR) search was performed for the period 2012-16 for journals that published articles on paediatric urology. Journals were ranked according to impact factor, and each individual journal website was accessed to assess for the presence of social media. Parents in paediatric urology clinics and non-paediatric urology patients also filled out a questionnaire to assess for awareness and attitudes to social media. All statistical analysis was performed using Prism 6 software (Prism 6, GraphPad Software, California, USA). Overall, there were 50 urological journals and 39 paediatric journals with a mean impact factor of 2.303 and 1.766, respectively. There was an overall average increase in impact factor across all urological journals between 2012 and 16. The presence of a Twitter feed was statistically significant for a rise in impact factor over the 4 years (P = 0.017). The cohort of parents was statistically more likely to have completed post-secondary education, to have and access to a social media profile, use it for health education, and use it to access journal/physician/hospital social media accounts. This study examined, for the first time, the role of social media in paediatric urology, and demonstrated that SoMe use is associated with a positive influence in impact factor, but also a parental appetite for it

  18. The impact of vascular endothelial growth factor and basic fibroblast growth factor on cardiac fibroblasts grown under altered gravity conditions

    DEFF Research Database (Denmark)

    Ulbrich, Claudia; Leder, Annekatrin; Pietsch, Jessica

    2010-01-01

    Myocardium is very sensitive to gravitational changes. During a spaceflight cardiovascular atrophy paired with rhythm problems and orthostatic intolerance can occur. The aim of this study was to investigate the impact of basic fibroblast growth factor (bFGF) and vascular endothelial growth factor...

  19. SDBI 1904: Human Factors Assessment of Vibration Effects on Visual Performance during Launch

    Science.gov (United States)

    Thompson, Shelby G.; Holden, Kritina; Root, Phillip; Ebert, Douglas; Jones, Jeffery; Adelstein, Bernard

    2009-01-01

    The primary objective of the of Human Factors Short Duration Bioastronautics Investigation (SDBI) 1904 is to determine visual performance limits during operational vibration and g-loads, specifically through the determination of minimal usable font sized using Orion-type display formats. Currently there is little to no data available to quantify human visual performance under these extreme conditions. Existing data on shuttle vibration magnitude and frequency is incomplete, does not address sear and crew vibration in the current configuration, and does not address human visual performance. There have been anecdotal reports of performance decrements from shuttle crews, but no structured data has been collected. The SDBI is a companion effort to the Detailed Test Objective (DTO) 695, which will measure shuttle seat accelerations (vibration) during ascent. Data fro the SDBI will serve an important role in interpreting the DTO vibration data. This data will be collected during the ascent phase of three shuttle missions (STS-119, 127, and 128). Both SDBI1904 and DTO 695 are low impact with respect to flight resources, and combined they represent an efficient and focused problem solving approach. The SDBI and DTO data will be correlated to determine the nature of perceived visual performance under varying vibrations and g-loads. This project will provide: 1) Immediate data for developing preliminary human performance vibration requirements; 2) Flight validated inputs for ongoing and future ground-based research; and 3) Information of functional needs that will drive Orion display format design decisions.

  20. Oral health impact, dental caries experience, and associated factors in 12-15-year-old school children in India.

    Science.gov (United States)

    Kumar, Sandeep; Kumar, Amit; Badiyani, Bhumika; Kumar, Arunoday; Basak, Debashish; Ismail, Mohammed B

    2017-04-01

    Dental caries affects quality of life and has a negative impact on daily performance. The study was conducted to assess the impact of oral health and its associated factors in schoolchildren in the age group 12-15 years in Indore, Madhya Pradesh. A cross-sectional survey was conducted in schoolchildren in the age group 12-15 years. Sociodemographic and oral health related behaviors of schoolchildren were collected using a self-administered questionnaire. Child oral impact on daily performance (OIDP) questionnaire was used to assess the oral impacts. Oral examination was performed to check the presence of caries using decayed, missing and filled teeth (DMFT) index. A total of 690 schoolchildren participated in the survey. The mean age of the children was 13.58 years. The overall prevalence of dental caries was found to be 47.2%. The prevalence of one or more impact in the study population was 36.5%. The most prevalent impact was difficulty in eating and cleaning of teeth and the least prevalent impact were emotion and studying. Results of logistic regression analysis showed that the type of school that a child goes to, socioeconomic status, material used, dental visit, and dental caries were significantly associated with the Child-OIDP affected score. Oral health had a significant effect on the quality of life of schoolchildren. The prevalence of dental caries was found to be high. Effective policies need to be drafted for oral health promotion in this age group.

  1. Continued Growth of the Impact Factors of MDPI Open Access Journals

    Directory of Open Access Journals (Sweden)

    Dietrich Rordorf

    2010-06-01

    Full Text Available We are pleased to report the continued increase of the Impact Factors of MDPI journals in 2009 (see Table 1 and Figure 1. As noted in a similar Editorial published in June 2009, the Impact Factors of MDPI journals have been steadily recovering since the inception of the full Open Access publishing policy in early 2007 [1]. We are pleased to see that all journals now have an Impact Factor much higher than 1. In 2011 the Journal Citation Report (JCR will include the first official Impact Factor of Entropy , and in 2012, the International Journal of Environmental Research and Public Health will be included for the first time. Nevertheless, we are already able to compute a preliminary impact factor of approximately 1.4 for Entropy [2]. [...

  2. The evaluation of the individual impact factor of researchers and research centers using the RC algorithm.

    Science.gov (United States)

    Cordero-Villafáfila, Amelia; Ramos-Brieva, Jesus A

    2015-01-01

    The RC algorithm quantitatively evaluates the personal impact factor of the scientific production of isolated researchers. The authors propose an adaptation of RC to evaluate the personal impact factor of research centers, hospitals and other research groups. Thus, these could be classified according to the accredited impact of the results of their scientific work between researchers of the same scientific area. This could be useful for channelling budgets and grants for research.

  3. Impact of Routing Protocol on the Performance of Wireless Sensor Network

    Directory of Open Access Journals (Sweden)

    Md. Khaled Ben Islam

    2015-01-01

    Full Text Available In Wireless Sensor Networks, most sensor nodes are deployed with limited resources and dissemination of sensed information is one of the resource intensive tasks. Proper utilization of those limited resources in case of information routing is one of the key factors for the performance and lifetime of a sensor network. These issues are more challenging when sensor networks are considered as building block of Internet of Things. In our work, we have investigated the impact of routing protocol selection on the performance of a wireless sensor network in IoT context. We have simulated different types wireless sensor network with DSDV, AODV, DYMO, DSR, and OLSR routing protocols using network simulator NS-2. In all these scenarios, we have used Packet Delivery Ratio, Throughput, End-to-End delay, Normalized Routing Load and Data Packet Loss as metric to analyze the performance of each considered routing techniques. Simulation results suggest that selection of routing protocol for a particular wireless sensor network has great significance on the overall performance of the network and for selecting a routing protocol, it would be better to consider the nature of the network first to achieve higher performance.

  4. The impact of Lean bundles on hospital performance: does size matter?

    Science.gov (United States)

    Al-Hyari, Khalil; Abu Hammour, Sewar; Abu Zaid, Mohammad Khair Saleem; Haffar, Mohamed

    2016-10-10

    Purpose The purpose of this paper is to study the effect of the implementation of Lean bundles on hospital performance in private hospitals in Jordan and evaluate how much the size of organization can affect the relationship between Lean bundles implementation and hospital performance. Design/methodology/approach The research is considered as quantitative method (descriptive and hypothesis testing). Three statistical techniques were adopted to analyse the data. Structural equation modeling techniques and multi-group analysis were used to examine the research's hypothesis, and to perform the required statistical analysis of the data from the survey. Reliability analysis and confirmatory factor analysis were used to test the construct validity, reliability and measurement loadings that were performed. Findings Lean bundles have been identified as an effective approach that can dramatically improve the organizational performance of private hospitals in Jordan. Main Lean bundles - just in time, human resource management, and total quality management are applicable to large, small and medium hospitals without significant differences in advantages that depend on size. Originality/value According to the researchers' best knowledge, this is the first research that studies the impact of Lean bundles implementation in healthcare sector in Jordan. This research also makes a significant contribution for decision makers in healthcare to increase their awareness of Lean bundles.

  5. The Impact Of Adjustment In Capital Structure In Mergers & Acquisitions On Us Acquirers' Business Performance

    National Research Council Canada - National Science Library

    Taoufik Bouraoui; Ting Li

    2014-01-01

    ...) and Return On Assets (ROA) to measure post-merger performance. We find that leverage changes have a negative impact on performance, in both the short and long run after Mergers & Acquisitions (M&A...

  6. Hypothetical influence of non-indexed Spanish journals on the impact factor of radiological journals

    Energy Technology Data Exchange (ETDEWEB)

    Miguel-Dasit, Alberto [MR Section, La Plana de Vila-Real Hospital, Castellon (Spain); Aleixandre, Rafael [Institute of History of Science and Documentation Lopez Pinero, University of Valencia-CSIC, Valencia (Spain); Valderrama, Juan C. [Institute of History of Science and Documentation Lopez Pinero, University of Valencia-CSIC, Valencia (Spain); Marti-Bonmati, Luis [Department of Radiology, MR Section, Dr. Peset University Hospital, Avenida Gaspar Aguilar 90, E-46017 Valencia (Spain)]. E-mail: marti_lui@gva.es; Sanfeliu, Pilar [Cardenal Herrera-CEU University, Alfara, Valencia (Spain)

    2005-06-01

    Objective: The aim of this study was to analyze the hypothetical changes in the 2001 impact factor of 52 radiological journals included in the Science Citation Index-Journal Citation Reports by also counting cites proceeding from 73 Spanish journals on different medical specialties. Also, to estimate the possible impact factor of the official Spanish radiology journal, Radiologia, not included in this database. Materials and methods: A modified 2001 impact factor of 52 radiological journals and Radiologia was obtained by adding the number of cites in 1999 and 2000 from the medical Spanish journals. Data were obtained by consulting the 2001 edition of the Journal Citation Reports in the 'Web of Science' database. Results: The 16,985 bibliographical references were analysed (232 of them to radiological journals). The journal with the largest increase in its 2001 impact factor (from 1.83 to 1.90) was Radiologic Clinics of North America. European Journal of Radiology was the European journal with the highest increase (from 1.084 to 1.110) in the difference between the 2001 modified and original impact factor. The modified 2001 impact factor of the 34 American journals was statistically higher (P = 0.016) than that of the 18 European journals (1.64 versus 0.93). Differences between the 2001 modified and original impact factor were slightly higher in the American journals (no statistically significant difference). The 2001 impact factor of Radiologia was 0.056. Discussion: Differences between the 2001 original and modified impact factor were small, but larger in the American journals. The 2001 impact factor of Radiologia was modest, although similar to other publications included in the Journal Citation Reports.

  7. E-Commerce New Venture Performance: How Funding Impacts Culture.

    Science.gov (United States)

    Hamilton, R. H.

    2001-01-01

    Explores the three primary methods of funding for e-commerce startups and the impact that funding criteria have had on the resulting organizational cultures. Highlights include self-funded firms; venture capital funding; corporate funding; and a table that compares the three types, including examples. (LRW)

  8. E-Commerce New Venture Performance: How Funding Impacts Culture.

    Science.gov (United States)

    Hamilton, R. H.

    2001-01-01

    Explores the three primary methods of funding for e-commerce startups and the impact that funding criteria have had on the resulting organizational cultures. Highlights include self-funded firms; venture capital funding; corporate funding; and a table that compares the three types, including examples. (LRW)

  9. Dynamic Performance Assessment of Side Facing Troop Seats During Impact

    Science.gov (United States)

    2016-04-30

    test and on both the CV- 22 and CH-53 tests. The H-60 seat was run at 18G’s again due to complete failure of the restraint system and inertial reel...Stanaker, R. et al., "Size, Weight and Biomechanical Impact Response Requirements for Adult Size Small Female and Large Male Dummies," SAE Technical Paper

  10. Impact of interpersonal factors on insight in schizophrenia.

    Science.gov (United States)

    Hélène, Tastet; Hélène, Verdoux; Jean, Bouisson; Jean-Marc, Destaillats; Antoinette, Prouteau

    2014-11-01

    Whereas clinical insight in schizophrenia has been consistently associated with personal factors (i.e. sociodemographic characteristics, symptoms or cognition), little is known about its relationships with interpersonal factors (i.e. close environment and personal characteristics involved in social interactions). Most of the few studies available have focused on one particular interpersonal factor, such as social cognition, contact frequencies or therapeutic alliance. To date, no study has explored the specificity of associations between clinical insight and different levels of interpersonal factors, neither if these associations are independent of personal factors. Associations between insight and interpersonal factors were explored through multiple regression in a sample of 80 outpatients with schizophrenia spectrum disorders. Lower insight was associated with lower interpersonal functioning, independently from personal factors such as age, gender, age at first hospitalization, executive functioning and symptoms. Our findings replicate previous studies with regard to the associations between clinician-rated insight and social cognition or social contact frequencies. They also provide new information about specific associations between clinician-rated insight and perceived social support as well as between patient-rated insight and therapeutic alliance. Finally, models of insight based on personal factors were significantly improved by the inclusion of interpersonal factors. These results strongly support the crucial role of interpersonal factors in insight, both from the clinician's and the patient's point of view. These exploratory data require further replication.

  11. INTELLECTUAL CAPITAL PERFORMANCE AND ITS IMPACT ON CORPORATE PERFORMANCE: AN EMPIRICAL EVIDENCE FROM MODARABA SECTOR OF PAKISTAN.

    Directory of Open Access Journals (Sweden)

    Wasim ul Rehman

    2011-09-01

    Full Text Available The aim of study of this is to examine the Intellectual Performance (IC of 12 Modaraba companies and its impact on corporate performance. This study examines the performance of three main components of VAIC™ i.e. Human Capital Efficiency (HCE, Structural Capital Efficiency (SCE and Capital Employed Efficiency (CEE and its impact on corporate performance by employing the predictive analysis. The empirical results reveal that one of the important components to strengthen the IC performance is Human Capital Efficiency (HCE which means investing more to boost the employees productive would increase the human efficiency of employees. The results show that HCE has significant relation at (P>0.1 with financial performance (ROE and EPS, SCE at (P >0.1 and (P>0.05 with financial performance (ROE and (EPS respectively. Whereas CEE has substantive effect with ROE and ROI at (P>0.05 and with (EPS at (P>0.1 respectively.

  12. The Impact of Technology, Job Complexity and Religious Orientation on Managerial Performance

    Directory of Open Access Journals (Sweden)

    Jesmin Islam

    2011-12-01

    Full Text Available This paper explores the impact of technology, job complexity and religious orientation on the performance of managers in the financial services industries. Data were collected from bank managers representing Islamic and conventional banks in Bangladesh. Path models were used to analyse the data. The results provide supportfor the hypothesis that a management accounting systems (MAS adequacy gap exists in the financial sector in a developing country such as Bangladesh. These Islamic and conventional banks also experienced varied outcomes regarding the impact of the MAS adequacy gap on managerial effectiveness. Significant results emerged concerning the direct influence of technology and job complexity on managerial effectiveness, although these findings again differed across religious and conventional banks. Significant intervening effects of both MAS adequacy gap and job complexity on the relationships between contingency factors and managers' effectiveness were also found. Overall the findings showed that the type of religious orientation in Islamic banks wielded an important influence on the sensitivity of the MAS adequacy gap. Religious orientation served as a control device for the relationships between job-related contingency factors andmanagerial effectiveness.

  13. Impact of Directors’ Remuneration on Financial Performance of a Firm

    Directory of Open Access Journals (Sweden)

    Sania Khalid

    2014-02-01

    Full Text Available This paper examines the possible association between financial performance of the firm and remuneration of its key management. It is also one of the very few examples, which attempts to test the pay-for-performance theory of agency conflict resolution in context of developing market(Pakistan. The present study examines the performance of firms in terms of profitability and its association with management remuneration for 70 Pakistani corporate firms listed in Karachi stock exchange for the period of 2007 to 2011 and attempts to explain the observed behaviour with the help of fixed effect model. The results consistently support the potential association between firm’s financial performance and management remuneration policy although the intensity of relationship differs across different measures of performance. We find evidence in support of the hypothesis that a positive association exists between remuneration and performance in terms of resource utilization and shareholder wealth.

  14. The impact of von Willebrand factor on factor VIII memory immune responses.

    Science.gov (United States)

    Chen, Juan; Schroeder, Jocelyn A; Luo, Xiaofeng; Shi, Qizhen

    2017-08-22

    Immune tolerance induction (ITI) with aggressive infusion of factor VIII (FVIII) is the current strategy used to eradicate FVIII inhibitors and restore normal FVIII pharmacokinetics in inhibitor patients. Whether the use of FVIII products containing von Willebrand factor (VWF) will affect the efficacy of ITI is still controversial. In this study, we explored the impact of VWF on FVIII memory immune responses in hemophilia A (HA) mice. A T-cell proliferation assay and cytokine profile analysis were used to study FVIII-primed CD4(+) T cells. When CD4(+) T cells from primed FVIII(null) mice were restimulated with recombinant human FVIII (rhF8) plus recombinant human VWF (rhVWF) in vitro, the percentages of daughter CD4(+) T cells were significantly decreased compared with the groups cultured with rhF8 only. Levels of interferon-γ and interleukin 10 were significantly lower in the rhF8 plus rhVWF groups than in the rhF8 groups. When memory B-cell pools from primed FVIII(null) mice were cultured with rhF8 with or without rhVWF to induce differentiation of memory B cells into antibody-secreting cells (ASCs), the number of ASCs was significantly lower in the rhF8 plus VWF group than in the rhF8 group. When memory B-cell pools were transferred into NSGF8KO mice followed by rhF8 immunization with or without rhVWF, the titers of anti-F8 inhibitors and total immunoglobulin G were significantly higher in the rhF8 group than in the rhF8 plus rhVWF group, with an average difference of 2.23- and 2.04-fold. Together, our data demonstrate that VWF attenuates FVIII memory immune responses in HA mice.

  15. Impact of the Internet on Academic Performance of Students in ...

    African Journals Online (AJOL)

    Questionnaire was the instrument employed for data collection. Frequency count ... Keywords: internet, academic performance, internet resources, computer terminals, academic pursuit. ... It also provides a means of scholarly communication.

  16. The predictive performance of commodity futures risk factors

    OpenAIRE

    Ahmed, Shamim; Tsvetanov, Daniel

    2016-01-01

    This paper investigates the time-series predictability of commodity futures excess returns from factor models that exploit two risk factors – the equally weighted average excess return on long positions in a universe of futures contracts and the return difference between the high- and low-basis portfolios. Adopting a standard set of statistical evaluation metrics, we find weak evidence that the factor models provide out-of-sample forecasts of monthly excess returns significantly better than t...

  17. The Impact of Accelerated Promotion Rates on Drill Sergeant Performance

    Science.gov (United States)

    2011-01-01

    Building on prior work, (Kubisiak et al., 2005; White & Young, 1998), the TAPAS is loosely based on the Big Five Theory of personality ( Costa & McCrae ...1992; McCrae & Costa , 1987). The TAPAS extends the basic five factors into additional more fine-tuned facet components of the factors. The current...feedback on planning for career development. Journal of Management Development, 18 (8), 676-693. Costa , P. T., & McCrae , R. R. (1992). Four ways five

  18. Nonnegative Matrix Factorizations Performing Object Detection and Localization

    Directory of Open Access Journals (Sweden)

    G. Casalino

    2012-01-01

    Full Text Available We study the problem of detecting and localizing objects in still, gray-scale images making use of the part-based representation provided by nonnegative matrix factorizations. Nonnegative matrix factorization represents an emerging example of subspace methods, which is able to extract interpretable parts from a set of template image objects and then to additively use them for describing individual objects. In this paper, we present a prototype system based on some nonnegative factorization algorithms, which differ in the additional properties added to the nonnegative representation of data, in order to investigate if any additional constraint produces better results in general object detection via nonnegative matrix factorizations.

  19. Evaluation of the impact chip multiprocessors have on SNL application performance.

    Energy Technology Data Exchange (ETDEWEB)

    Doerfler, Douglas W.

    2009-10-01

    This report describes trans-organizational efforts to investigate the impact of chip multiprocessors (CMPs) on the performance of important Sandia application codes. The impact of CMPs on the performance and applicability of Sandia's system software was also investigated. The goal of the investigation was to make algorithmic and architectural recommendations for next generation platform acquisitions.

  20. A cross-sectional comparative study to determine the factors contributing to the academic performance of the high performers and low performers in 2nd year medical students

    Directory of Open Access Journals (Sweden)

    Yogeeta Sushant Walke

    2015-12-01

    Conclusion: Through our study, we identified important factors contributing to high performance in academics, and we concluded that students should incorporate all the factors in a well-coordinated manner rather than focusing on any single factor. If executed, appropriately it will definitely upgrade their academic performance and prevent undesirable failures. [Int J Basic Clin Pharmacol 2015; 4(6.000: 1072-1079

  1. Integrated Impact Indicators (I3) compared with Impact Factors (IFs): An alternative research design with policy implications

    CERN Document Server

    Leydesdorff, Loet

    2011-01-01

    In bibliometrics, the association of "impact" with central-tendency statistics is mistaken. The impact of two collisions is more than the mean or median of the two impacts; impacts add up, and citation curves should therefore be integrated instead of averaged. For example, the journals MIS Quarterly and JASIST differ by a factor of two in terms of their respective impact factors (IF), but the journal with the lower IF has the higher impact. Using percentiles (e.g., top-1%, top-10%, etc.), an integrated impact indicator (I3) can be based on integration of the citation curves after normalization to the same scale. The results across document sets can be compared as percentages of the total impact of a reference set. Total number of citations, however, should not be used instead because the shape of the citation curves is then not appreciated. In addition to comparing I3 with IFs for the journals in two ISI Subject Categories ("Information Science & Library Science" and "Multidisciplinary Sciences"), we show...

  2. Impact of Microfinance on the Performance of an Agriculture Industry in Pakistan

    OpenAIRE

    Subhani, Muhammad Imtiaz

    2010-01-01

    This study is an attempt to investigate the impact of microfinance on industry performance. The findings explain that there is no as such impact of microfinance on agriculture industry performance in a country like Pakistan. Research problem is to find out whether Microfinance has positive impact on agriculture industry growth or not, what role is played by microfinance in under developing countries like Pakistan, are people aware of it. Five years secondary Data comprised on years 2003-2008 ...

  3. Factors Contributing to SMEs Failure in Meeting Supplier Performance Standards

    National Research Council Canada - National Science Library

    Louise van Scheers

    2016-01-01

    ...) in meeting supplier performance standards. Suppliers are faced with the challenge of SMEs failing to meet supplier performance standards because they rely on these providers of products and services, mainly SMEs, for their operations...

  4. The Dynamic Performance of Concrete under Impact Loading

    Directory of Open Access Journals (Sweden)

    Wei Shi

    2013-07-01

    Full Text Available The process of concrete under symmetric impact was experimentally investigated in the case of primary gas gun and was analyzed with Lagrange method. The value-time relations of u, v, e on every lagrange position are gained. The relationship of strain-stress is also obtained. The whole process is numerical simulated by LSDYNA970. It indicate that the damage effect of concrete under impact loading can be described by the function with plasticity strain at constant volume, equivalence plasticity strain and pressure. The manganin pressure gauge is used to measure the pressure-time curves of the samples. The parameters of high-pressure equation are obtained by the numerical simulation. Numerical simulation is a necessary complement to the test. The spall phenomenon is observed by the numerical simulation.

  5. Dynamic Web Pages: Performance Impact on Web Servers.

    Science.gov (United States)

    Kothari, Bhupesh; Claypool, Mark

    2001-01-01

    Discussion of Web servers and requests for dynamic pages focuses on experimentally measuring and analyzing the performance of the three dynamic Web page generation technologies: CGI, FastCGI, and Servlets. Develops a multivariate linear regression model and predicts Web server performance under some typical dynamic requests. (Author/LRW)

  6. The Impact of Employment and Physical Activity on Academic Performance

    Science.gov (United States)

    Andreopoulos, Giuliana Campanelli; Antoniou, Eliana; Panayides, Alexandros; Vassiliou, Evros

    2008-01-01

    Over the last twenty years, many contributions appeared on the relationship between working during school and academic performance using both quantitative and qualitative research methods. The obvious assumption is that a full time working student will show a lower academic performance relatively to a part time working student or a full time…

  7. The impact of exercise-induced bronchoconstriction on athletic performance

    DEFF Research Database (Denmark)

    Price, Oliver J; Hull, James H; Backer, Vibeke

    2014-01-01

    of this review is to provide a systematic appraisal of the current status of knowledge regarding EIB and exercise performance and to highlight potential mechanisms by which performance may be compromised by EIB. DATA SOURCES AND STUDY SELECTION: PubMed/Medline and EBSCO databases were searched up to May 2014...

  8. Incentives, Selection, and Teacher Performance: Evidence from IMPACT

    Science.gov (United States)

    Dee, Thomas S.; Wyckoff, James

    2015-01-01

    Teachers in the United States are compensated largely on the basis of fixed schedules that reward experience and credentials. However, there is a growing interest in whether performance-based incentives based on rigorous teacher evaluations can improve teacher retention and performance. The evidence available to date has been mixed at best. This…

  9. Impact of Political Environment on Business Performance of ...

    African Journals Online (AJOL)

    DR Nneka

    significant relationship with business performance of multinational ... have the potential to promote or inhibit market competition, social risks often have ... will prove to have adverse effects on the multinational's profits and/or goals. .... management, multinational companies can drive business performance improvement.

  10. Interactions between the spatial and temporal stimulus factors that influence multisensory integration in human performance

    Science.gov (United States)

    Stevenson, Ryan A.; Fister, Juliane Krueger; Barnett, Zachary P.; Nidiffer, Aaron R.; Wallace, Mark T.

    2012-01-01

    In natural environments, human sensory systems work in a coordinated and integrated manner to perceive and respond to external events. Previous research has shown that the spatial and temporal relationships of sensory signals are paramount in determining how information is integrated across sensory modalities, but in ecologically plausible settings, these factors are not independent. In the current study we provide a novel exploration of the impact on behavioral performance for systematic manipulations of the spatial location and temporal synchrony of a visual-auditory stimulus pair. Simple auditory and visual stimuli were presented across a range of spatial locations and stimulus onset asynchronies (SOAs), and participants performed both a spatial localization and simultaneity judgment task. Response times in localizing paired visual-auditory stimuli were slower in the periphery and at larger SOAs, but most importantly, an interaction was found between the two factors, in which the effect of SOA was greater in peripheral as opposed to central locations. Simultaneity judgments also revealed a novel interaction between space and time: individuals were more likely to judge stimuli as synchronous occurring in the periphery at large SOAs. The results of this study provide novel insights into (a) how the speed of spatial localization of an audiovisual stimulus is affected by location and temporal coincidence and the interaction between these two factors, and (b) how the location of a multisensory stimulus impacts judgments concerning the temporal relationship of the paired stimuli. These findings provide strong evidence for a complex interdependency between spatial location and temporal structure in determining the ultimate behavioral and perceptual outcome associated with a paired multisensory (i.e., visual-auditory) stimulus. PMID:22447249

  11. The impact of lean management implementation on organizational operational performance

    Directory of Open Access Journals (Sweden)

    Hira Hashmi

    2015-12-01

    Full Text Available Background: The research aims to develop the consensus between different operational improvement strategies, to address the relationship between the operational characteristics (lean and operational performance of the organization. Methods: Variables from which the extraction of the outcomes has been established include operational performance, daily schedule adherence, repeat production and flow oriented layout. The technique of data analysis is selected to be Correlation and multiple regressions. The aim for performing these tests is to highlight association of lean strategy with the operational performance. Results and conclusions: The positive association is being established amongst the operational performance and the daily schedule adherence, flow oriented layout and the repeat production. It is suggested to the supply chain management that they must entail their production team for having repetition in their work and become efficient in their production. They must be reached to their optimization level, where they have to extract less waste and have high level of the production.

  12. Impact of HMO mergers and acquisitions on financial performance.

    Science.gov (United States)

    Weech-Maldonado, Robert

    2002-01-01

    This study examines the effect of health maintenance organization (HMO) mergers and acquisitions on financial performance, as indicated by cash flow returns, profitability ratios, and efficiency indicators. Pooled, cross-sectional files of financial performance data were created for HMO mergers occurring in the period of 1988 to 1994. The study uses a time-series design involving the analysis of pre- and post-acquisition financial performance measured over a period of four years. Change scores for the industry-adjusted financial performance measures were calculated and then evaluated using t-tests. The study showed that HMO mergers had a positive effect on financial performance and efficiency. This effect disappeared, however, after adjusting for HMO industry returns. Potential synergies arising from HMO mergers have been largely illusory. Mergers may have been a result of non-value enhancing motives or management overconfidence.

  13. Investigating the impact of performance management on human resource performance across head offices of Agricultural bank branches in Tehran

    Directory of Open Access Journals (Sweden)

    Mir Hamid Reza Torabi Shahidi

    2013-08-01

    Full Text Available Human resource is one of the most precious assets across contemporary organizations and companies. For this reason, enterprises have to invest on them to promote and improve their employees’ performance. An effective mechanism to develop corporate and human performance is to design and establish a system of performance management so that it improves employees’ performance by determining explicit organizational objectives and coordinating them with individual goals.Current work aims to determine the impact of performance management on human resource performance across head offices of Agricultural Bank branches in Tehran (the main goal and prioritize among performance management components and human resource performance components and also present some procedures to improve human performance using performance management components (sub-goals.

  14. Economic and Demographic Factors Impacting Placement of Students with Autism

    Science.gov (United States)

    Kurth, Jennifer A.; Mastergeorge, Ann M.; Paschall, Katherine

    2016-01-01

    Educational placement of students with autism is often associated with child factors, such as IQ and communication skills. However, variability in placement patterns across states suggests that other factors are at play. This study used hierarchical cluster analysis techniques to identify demographic, economic, and educational covariates…

  15. Impact factor analysis: combining prediction with parameter ranking to reveal the impact of behavior on health outcome

    DEFF Research Database (Denmark)

    Doryab, Afsaneh; Frost, Mads; Faurholt-Jepsen, Maria;

    2015-01-01

    suffering from bipolar disorder. In the MONARCA system, patients report their daily mood score and by analyzing self-reported and automatically sensed behavioral data with this mood score, the system is able to identify the impact of different behavior on the patient’s mood. We report from a study involving...... ten bipolar patients, in which we were able to estimate mood values with an average mean absolute error of 0.5. This was used to rank the behavior parameters whose variations indicate changes in the mental state. The rankings acquired from our algorithms correspond to the patients’ rankings......, identifying physical activity and sleep as the highest impact parameters. These results revealed the feasibility of identifying behavioral impact factors. This data analysis motivated us to design an impact factor inference engine as part of the MONARCA system. To our knowledge, this is a novel approach...

  16. Scientific and regulatory standards for assessing product performance using the similarity factor, f2.

    Science.gov (United States)

    Stevens, Ruth E; Gray, Vivian; Dorantes, Angelica; Gold, Lynn; Pham, Loan

    2015-03-01

    The similarity factor, f2, measures the sameness of dissolution profiles. The following commentary is an overview of discussions and presentations from a group of industry and US regulatory experts that have integrated the science and regulatory research and practice for assessing product performance, particularly for modified-release (MR) dosage forms, using f2. For a drug development sponsor or applicant with an orally complex dosage formulation, it is critical to understand dissolution methods and the similarity factor and how and/or when to apply it in their NDA, ANDA, or PMA submission. As part of any regulatory submission, it is critical to justify that the product performance has not been impacted by any change in the manufacturing process and/or the delayed and/or prolonged drug release characteristics compared to a similar conventional or another orally complex dosage form. The purposes of this document are (1) to provide a description of appropriate dissolution methods, how is the f2 calculated and how it can be used to justify product performance similarity, or not; (2) to provide an overview of alternative methods available for dissolution profile comparisons, and (3) to illustrate how applying these concepts in a focused way supports approval of submissions and regulatory dossiers and aligns them with on-going science and regulatory initiatives. A case study will be used as an example to demonstrate how dissolution testing and the f2 calculation results can impact regulatory outcomes from an NDA (505(b)(1)), NDA (505(b)(2)), ANDA (505(j)), supplemental NDAs/ANDAs, or PMA perspective.

  17. The prevalence and severity of oral impacts on daily performances in Thai primary school children

    Directory of Open Access Journals (Sweden)

    Sheiham Aubrey

    2004-10-01

    Full Text Available Abstract Background Traditional methods of measuring oral health mainly use clinical dental indices and have been complemented by oral health related quality of life (OHRQoL measures. Most OHRQoL studies have been on adults and elderly populations. There are no systematic OHRQoL studies of a population-based sample of children. The objective of this study was to assess the prevalence, characteristics and severity of oral impacts in primary school children. Methods Cross-sectional study of all 1126 children aged 11–12 years in a municipal area of Suphanburi province, Thailand. An OHRQoL measure, Child-Oral Impacts on Daily Performances index (Child-OIDP was used to assess oral impacts. Children were also clinically examined and completed a self-administered questionnaire about demographic information and oral behaviours. Results 89.8% of children had one or more oral impacts. The median impact score was 7.6 and mean score was 8.8. Nearly half (47.0% of the children with impacts had impacts at very little or little levels of intensity. Most (84.8% of those with impacts had 1–4 daily performances affected (out of 8 performances. Eating was the most common performance affected (72.9%. The severity of impacts was high for eating and smiling and low for study and social contact performances. The main clinical causes of impacts were sensitive tooth (27.9%, oral ulcers (25.8%, toothache (25.1% and an exfoliating primary tooth (23.4%. Conclusions The study reveals that oral health impacts on quality of life in Thai primary school children. Oral impacts were prevalent, but not severe. The impacts mainly related to difficulty eating and smiling. Toothache, oral ulcers and natural processes contributed largely to the incidence of oral impacts.

  18. IMPACT OF COMMITMENT TO BUSINESS ETHICS TO NONFINANCIAL BUSINESS PERFORMANCE

    Directory of Open Access Journals (Sweden)

    Silvija Vig

    2016-03-01

    Full Text Available The article investigates the relationship between commitment to business ethics and nonfinancial business performance. Data of commitment to business ethics and nonfinancial business performance were collected from 100 participants through a questionnaire survey. The survey was conducted in 2015 in Croatian large and medium sized companies. The questionnaire for assessing commitment to business ethics contained nine different dimensions while the nonfinancial business performance contained three dimensions: client satisfaction, human resource management plus innovativeness and efficiency of business processes. Multiple regression methods were applied in the analysis. The empirical results of three multiple linear regression models show that certain dimension of commitment to business ethics had a positive influence on the nonfinancial performance of the companies. Motivation and rewarding policy for ethical behavior and responding to unethical behavior, as a dimension of commitment to business ethics, has distinctive effects on all three nonfinancial performance dimensions. It was also found that selecting suppliers based on the standards of ethics and compliance has a positive and strong influence on client satisfaction while using ethical criteria in the performance and efficiency evaluation of employees has a positive and significant influence on innovativeness and efficiency of business processes. This research leads to the conclusion that some dimensions of commitment to business ethics can be important predictors of nonfinancial business performance. Therefore, results of the research could be considered as valid motivation for further improvement of commitment to ethics in the business environment.

  19. Impact of Dietary Antioxidants on Sport Performance: A Review.

    Science.gov (United States)

    Braakhuis, Andrea J; Hopkins, Will G

    2015-07-01

    Many athletes supplement with antioxidants in the belief this will reduce muscle damage, immune dysfunction and fatigue, and will thus improve performance, while some evidence suggests it impairs training adaptations. Here we review the effect of a range of dietary antioxidants and their effects on sport performance, including vitamin E, quercetin, resveratrol, beetroot juice, other food-derived polyphenols, spirulina and N-acetylcysteine (NAC). Older studies suggest vitamin E improves performance at altitude, with possible harmful effects on sea-level performance. Acute intake of vitamin E is worthy of further consideration, if plasma levels can be elevated sufficiently. Quercetin has a small beneficial effect for exercise of longer duration (>100 min), but it is unclear whether this benefits athletes. Resveratrol benefits trained rodents; more research is needed in athletes. Meta-analysis of beetroot juice studies has revealed that the nitrate component of beetroot juice had a substantial but unclear effect on performance when averaged across athletes, non-athletes and modes of exercise (single dose 1.4 ± 2.0%, double dose 0.5 ± 1.9%). The effect of addition of polyphenols and other components to beetroot juice was trivial but unclear (single dose 0.4 ± 3.2%, double dose -0.5 ± 3.3%). Other food-derived polyphenols indicate a range of performance outcomes from a large improvement to moderate impairment. Limited evidence suggests spirulina enhances endurance performance. Intravenous NAC improved endurance cycling performance and reduced muscle fatigue. On the basis of vitamin E and NAC studies, acute intake of antioxidants is likely to be beneficial. However, chronic intakes of most antioxidants have a harmful effect on performance.

  20. The impact of preventive maintenance practices on manufacturing performance: A proposed model for SMEs in Malaysia

    Science.gov (United States)

    Lazim, Halim Mad; Taib, Che Azlan; Lamsali, Hendrik; Saleh, Mohamed Najib; Subramaniam, Chandrakantan

    2016-08-01

    Preventive maintenance (PM) plays important role to avoid or mitigate potential stoppages and disruptions of equipment or machinery from occurring in daily operations. PM emphasized total employee involvement and it is important for companies as well as Small and Medium Sized Enterprises (SMEs). SME sectors contribution to the Malaysian economy makes up 95% of the total manufacturers, however PM remain relatively lacking. The ability, reliability and effective maintenance management is highly important in order to achieve desired manufacturing performance. Therefore, organizational capability in planning, controlling, implementing and monitoring PM activities is important. Furthermore, empirical evidence on the potential impact of PM practices towards manufacturing performance with organizational capability as a moderating effect is still limited and indecisive. Henceforth, this paper aims to explore and investigate potential relationships between PM practices and manufacturing performance moderated by organizational capability in the contact of Malaysian SMEs in the manufacturing sector. Correspondently, the study intends to propose a new research framework and hypotheses to examine the abovementioned relationships. The proposed framework includes PM team, PM strategy and planned maintenance as the determinants, while organizational capability serves as the moderating variable. Manufacturing performance will be viewed in terms of innovation and financial factors. Proposed research direction and conclusion are discussed at the end of the study.