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Sample records for briggs criterion

  1. Myers-Briggs typology and Jungian individuation.

    Science.gov (United States)

    Myers, Steve

    2016-06-01

    Myers-Briggs typology is widely seen as equivalent to and representative of Jungian theory by the users of the Myers-Briggs Type Indicator (MBTI) and similar questionnaires. However, the omission of the transcendent function from the theory, and the use of typological functions as its foundation, has resulted in an inadvertent reframing of the process of individuation. This is despite some attempts to integrate individuation and typology, and reintroduce the transcendent function into Myers-Briggs theory. This paper examines the differing views of individuation in Myers-Briggs and Jungian theory, and some of the challenges of reconciling those differences, particularly in the context of normality. It proposes eight principles, drawn mainly from Jungian and classical post-Jungian work, that show how individuation as a process can be integrated with contemporary Myers-Briggs typology. These principles show individuation as being a natural process that can be encouraged outside of the analytic process. They make use of a wide range of opposites as well as typological functions, whilst being centred on the transcendent function. Central to the process is the alchemical image of the caduceus and a practical interpretation of the axiom of Maria, both of which Jung used to illustrate the process of individuation. © 2016, The Society of Analytical Psychology.

  2. Larval development of Lecanogaster chrysea Briggs, 1957

    African Journals Online (AJOL)

    Instituto de Ciencias del Mar, Paseo Nacional sIn, 08003 Barcelona, Spain. Received 18 February 1986; accepted 7 November 1986. The first description of the larval development of Lecanogasterchrysea Briggs, 1957 (Gobiesocidae) is presented. Adults of this species have been reported only off Ghana. The larvae ...

  3. Equalizing Opportunities for Success through the Myers-Briggs.

    Science.gov (United States)

    Wheeley, Barbara; Foley, Marie

    1987-01-01

    Explains personality types as measured by the Myers-Briggs Type Indicator, examining preferences for extraversion or introversion, sensing or intuitive perception, thinking or feeling judgement, and judgement or perception. (DMM)

  4. Understanding Personality: Shakespeare, Jung, and Myers-Briggs.

    Science.gov (United States)

    Anderson, Sexton G.; Lauderdale, Margaret D.

    1985-01-01

    Applies the Myers-Briggs Type Indicator (MBTI) to help high school juniors understand their own personalities and the personalities of Shakespearean characters. Provides a format for interdisciplinary learning where teachers and counselors work together in the classroom. (LLL)

  5. Credible Immigration Policy Reform: A Response to Briggs

    Science.gov (United States)

    Orrenius, Pia M.; Zavodny, Madeline

    2012-01-01

    The authors agree with Vernon M. Briggs, Jr., that U.S. immigration policy has had unexpected consequences. The 1965 immigration reforms led to unanticipated chain migration from developing countries whereas the 1986 Immigration Reform and Control Act failed to slow unauthorized immigration. The result is a large foreign-born population with…

  6. Career Assessment and the Myers-Briggs Type Indicator.

    Science.gov (United States)

    McCaulley, Mary H.; Martin, Charles R.

    1995-01-01

    The Myers-Briggs Type Inventory provides a way of determining the fit between individual preferences and potential occupations. It can give people an appreciation of their strengths and weaknesses and awareness of possible blind spots. Recognition of individual types can help in selecting appropriate steps for career planning and lifelong…

  7. The Myers-Briggs Type Indicator and Career Obstacles.

    Science.gov (United States)

    Healy, Charles C.; Woodward, Geoffrey A.

    1998-01-01

    Relationships between clients' Myers-Briggs Type Indicator (MBTI) scores and their career obstacles were investigated. Uses of MBTI are presented briefly. Subjects (N=118) were seeking career counseling; counselors administering the tests and rating clients were blind to the hypothesis. Results of a regression analysis are presented and discussed.…

  8. An Assessment of the Myers-Briggs Type Indicator

    Science.gov (United States)

    Carlyn, Marcia

    1977-01-01

    The Myers Briggs Type Indicator is a self-report inventory developed to measure variables in Carl Jung's personality typology. The four personality scales measured by the instrument, and the scoring process are described, and an extensive review of the intercorrelation, reliability, and validity research is presented. (Author/MV)

  9. Myers-Briggs Type Inventory Personality Preferences and Academic Performance.

    Science.gov (United States)

    Lowenthal, Werner; Meth, Hilda

    1989-01-01

    A study to determine if there are any relationships between the Myers-Briggs Type Inventory personality preferences and academic performance in schools of pharmacy is discussed. Differences in academic performance that could be related to gender are reported. (Author/MLW)

  10. An empirical Kaiser criterion.

    Science.gov (United States)

    Braeken, Johan; van Assen, Marcel A L M

    2017-09-01

    In exploratory factor analysis (EFA), most popular methods for dimensionality assessment such as the screeplot, the Kaiser criterion, or-the current gold standard-parallel analysis, are based on eigenvalues of the correlation matrix. To further understanding and development of factor retention methods, results on population and sample eigenvalue distributions are introduced based on random matrix theory and Monte Carlo simulations. These results are used to develop a new factor retention method, the Empirical Kaiser Criterion. The performance of the Empirical Kaiser Criterion and parallel analysis is examined in typical research settings, with multiple scales that are desired to be relatively short, but still reliable. Theoretical and simulation results illustrate that the new Empirical Kaiser Criterion performs as well as parallel analysis in typical research settings with uncorrelated scales, but much better when scales are both correlated and short. We conclude that the Empirical Kaiser Criterion is a powerful and promising factor retention method, because it is based on distribution theory of eigenvalues, shows good performance, is easily visualized and computed, and is useful for power analysis and sample size planning for EFA. (PsycINFO Database Record (c) 2017 APA, all rights reserved).

  11. Some Legends Never Die: Jack Briggs and His Legacy of Leadership.

    Science.gov (United States)

    Schultz, Judy

    2002-01-01

    Describes the life and work of the late Jack Briggs, who helped build Fond du Lac Tribal and Community College (FDLTCC) (Minnesota), the only college of its kind in the nation. Reports that FDLTCC has established a scholarship fund in Briggs' honor. (NB)

  12. An Empirical Kaiser Criterion.

    NARCIS (Netherlands)

    Braeken, Johan; Van Assen, Marcel A. L. M.

    2016-01-01

    In exploratory factor analysis (EFA), most popular methods for dimensionality assessment such as the screeplot, the Kaiser criterion, or—the current gold standard—parallel analysis, are based on eigenvalues of the correlation matrix. To further understanding and development of factor retention

  13. Myers Briggs Type indicator personality profiles in unipolar depressed patients.

    Science.gov (United States)

    Janowsky, David S; Hong, Elliot; Morter, Shirley; Howe, Laura

    2002-10-01

    The current study was designed to compare the distribution of Myers Briggs Type Indicator (MBTI) personality types in patients with Unipolar Depression compared to normative data. The MBTI divides individuals into four dichotomous types: Extroverted and Introverted, Sensing and Intuitive, Thinking and Feeling, and Judging and Perceiving. This yields eight single-factor and sixteen four-factor types. One-hundred-thirty Unipolar Depressed patients were administered the MBTI-Form F. Unipolar Depressed patients were significantly more often Introverted, Sensing, Feeling, and Perceiving single-factor types respectively, and Introverted-Sensing-Feeling-Perceiving, and Introverted-Intuitive-Feeling-Perceiving four-factor types. The male Introverted-Sensing-Feeling-Perceiving four-factor type was the most dramatically over-represented. The MBTI effectively discriminates a patient group with Unipolar Depression from a normative population.

  14. Recent assessments of the Myers-Briggs Type Indicator.

    Science.gov (United States)

    Carlson, J G

    1985-08-01

    The present paper focuses on approximately two dozen recent published studies that examined reliability and validity of the Myers-Briggs Type Indicator (MBTI) in clinical, counseling, and research settings. Several assessments of split-half and test-retest reliability of the standard Form F and shorter Form G of the Inventory have yielded generally satisfactory correlations for all four scales. A larger number of studies of construct validity of the MBTI have yielded support for research hypotheses in situations ranging from correlations of the MBTI with a personality inventory, to couples problems in a counseling setting, to line judgment in groups, and others. Therefore, the applications of the MBTI have been broad, although somewhat unsystematic, and with generally favorable validity assessment. Continued attempts to validate the instrument in a variety of settings are needed.

  15. A comparative view of the Myers-Briggs type indicator.

    Science.gov (United States)

    Eicke, F J; Blake, G; Replogle, W

    1993-03-01

    Many family practice residency programs use the Myers-Briggs Type Indicator (MBTI) in the process of resident advising. The purpose of this study was to validate the MBTI with an alternative personality evaluation instrument. We evaluated 44 residents with both the MBTI and the Sixteen Personality Factor Questionnaire (16PF) and computed correlation coefficients. The highest correlations between the two tests were for the Extraversion/Introversion dimension of personality (r = -.71). The 16PF factors of Tough Poise, Independence, and Superego/Control were also significantly correlated with items on the MBTI. The Anxiety dimension of the 16PF yielded no significant correlations with the MBTI. The Extraversion/Introversion variables of the MBTI and 16PF are highly correlated. Other variables on the 16PF and MBTI are also correlated.

  16. Seven Scales for the Minnesota-Briggs History Record With Reference Group Data

    Science.gov (United States)

    Briggs, Peter F.; And Others

    1972-01-01

    The Minnesota-Briggs History Record (M-B) is a self-administered history inventory. This monograph summarizes studies of the M-B and describes the development of seven scales based upon M-B items. (Authors)

  17. General Criterion for Harmonicity

    Science.gov (United States)

    Proesmans, Karel; Vandebroek, Hans; Van den Broeck, Christian

    2017-10-01

    Inspired by Kubo-Anderson Markov processes, we introduce a new class of transfer matrices whose largest eigenvalue is determined by a simple explicit algebraic equation. Applications include the free energy calculation for various equilibrium systems and a general criterion for perfect harmonicity, i.e., a free energy that is exactly quadratic in the external field. As an illustration, we construct a "perfect spring," namely, a polymer with non-Gaussian, exponentially distributed subunits which, nevertheless, remains harmonic until it is fully stretched. This surprising discovery is confirmed by Monte Carlo and Langevin simulations.

  18. Probabilistic Threshold Criterion

    Energy Technology Data Exchange (ETDEWEB)

    Gresshoff, M; Hrousis, C A

    2010-03-09

    The Probabilistic Shock Threshold Criterion (PSTC) Project at LLNL develops phenomenological criteria for estimating safety or performance margin on high explosive (HE) initiation in the shock initiation regime, creating tools for safety assessment and design of initiation systems and HE trains in general. Until recently, there has been little foundation for probabilistic assessment of HE initiation scenarios. This work attempts to use probabilistic information that is available from both historic and ongoing tests to develop a basis for such assessment. Current PSTC approaches start with the functional form of the James Initiation Criterion as a backbone, and generalize to include varying areas of initiation and provide a probabilistic response based on test data for 1.8 g/cc (Ultrafine) 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) and LX-17 (92.5% TATB, 7.5% Kel-F 800 binder). Application of the PSTC methodology is presented investigating the safety and performance of a flying plate detonator and the margin of an Ultrafine TATB booster initiating LX-17.

  19. An historical perspective on the treatment of vocation in the Briggs Report (1972).

    Science.gov (United States)

    Bradshaw, Ann

    2010-12-01

    To examine the vocational ideal in the Briggs Report (Briggs 1972), its evidence, context and interpretation. As recently argued in Journal of Clinical Nursing, twentieth century reports have misrepresented nursing. This paper considers this argument in relation to the Briggs Report and its understanding of vocation. Sources consulted: nursing periodicals 1960-1975, nursing textbooks 1937-1971, the Briggs Report, research studies on nursing 1961-1971, secondary works on nursing history. Included are three newly discovered major primary sources. An historiographical analysis of archival sources which interrogates primary and secondary evidence to make transparent interconnection, coherence, consistency and reliability. Despite evidence from its own commissioned data that vocation was an important motivating factor, the Briggs Report recommended a new nursing model. The concept of vocation in nursing has been commonly interpreted as a cultural tool hindering the subsequent development of nursing. This approach has been a driver for policy decisions in nursing. Despite its own evidence, the Briggs Committee recommended far reaching changes, accepted by government and implemented over the following decade as Project 2000. The concept of vocation warrants further scholarship. Whether the historical ideal of vocation remains important, negatively or positively, to the attitudes, values and motivations of the clinical nurse and the quality of patient care, is a relevant and significant issue for contemporary UK and international nursing practice and policy. © 2010 Blackwell Publishing Ltd.

  20. Exploring the Construct Validity of the Chinese Version of the Myers-Briggs Type Indicator-G

    National Research Council Canada - National Science Library

    Shi, Ru; Yang, Yebing

    2009-01-01

    .... Four Chinese-version personality questionnaires, Myers-Briggs Type Indication Form G, the Minnesota Multiphasic Personality Inventory-2, 16 Personality Factors and Eysenck Personality Questionnaire, were used...

  1. Pollen Dispersal by Catapult: Experiments of Lyman J. Briggs on the Flower of Mountain Laurel

    Science.gov (United States)

    Nimmo, John R.; Hermann, Paula M.; Kirkham, M. B.; Landa, Edward R.

    2014-09-01

    The flower of Kalmia latifolia L. employs a catapult mechanism that flings its pollen to considerable distances. Physicist Lyman J. Briggs investigated this phenomenon in the 1950s after retiring as longtime director of the National Bureau of Standards, attempting to explain how hydromechanical effects inside the flower's stamen could make it possible. Briggs's unfinished manuscript implies that liquid under negative pressure generates stress, which, superimposed on the stress generated from the flower's growth habit, results in force adequate to propel the pollen as observed. With new data and biophysical understanding to supplement Briggs's experimental results and research notes, we show that his postulated negative-pressure mechanism did not play the exclusive and crucial role that he credited to it, though his revisited investigation sheds light on various related processes. Important issues concerning the development and reproductive function of Kalmia flowers remain unresolved, highlighting the need for further biophysical advances.

  2. The influence of Myers-Briggs type indicator profiles on team development processes

    NARCIS (Netherlands)

    Kuipers, B.; Higgs, M.; Tolkacheva, N.V.; de Witte, M.C.

    2009-01-01

    The Myers-Briggs Type Indicator (MBTI) is one of the most common personality assessments and a frequently used instrument for team development. However, in relation to team development processes, there is little research and literature on the role of personality in general and the usefulness of MBTI

  3. an assessment of the myers briggs type indicator from a practical

    African Journals Online (AJOL)

    It is not intended to be a formal psychological assessment. 1. INTRODUCTION. The Myers Briggs Type .... each individual created by God is the teleological doctrine of God's personal judgement of every individual, .... space and are therefore extremely sensitive to reactions, responses and attitudes within that space and ...

  4. Use of the Myers-Briggs Type Indicator (MBTI) with Physicians: A Review of the Literature.

    Science.gov (United States)

    Howard, David H.

    This document reviews the research on the use of the Myers-Briggs Type Indicator (MBTI), with medical students and physicians. The MBTI is a paper-and-pencil instrument based on C. G. Jung's theory of personality typology. The introductory section of the review describes the MBTI and explains its dimensions (extroverted versus introverted, sensing…

  5. The Myers-Briggs Type Indicator and the Teaching-Learning Process.

    Science.gov (United States)

    McCaulley, Mary H.

    The Myers-Briggs Type Indicator (MBTI) was developed specifically to make possible the implementation of Carl Jung's theory of type and is concerned mainly with conscious elements of the personality. It assumes that to function well, an individual must have a well-developed system for perception and a well-developed system for making decisions or…

  6. The Myers-Briggs Type Indicator: A Measure for Individuals and Groups.

    Science.gov (United States)

    McCaulley, Mary H.

    1990-01-01

    Describes Myers-Briggs Type Indicator (MBTI). Looks at history and development of the MBTI, characteristics, scores, Jung's theory of lifelong development, the dynamic interaction of the four functions measured by the MBTI, the construction of the MBTI, use with groups, how to use type tables, and use of the MBTI in career counseling. (NB)

  7. Relationship Between Personality Types on the Strong-Campbell and Myers-Briggs Instruments.

    Science.gov (United States)

    Dillon, Michael; Weissman, Shel

    1987-01-01

    Examined relationship between Holland's personality types as measured by the Strong-Campbell Interest Inventory and Jung's personality types as measured by the Myers-Briggs Type Indicator. College students' (N=394) responses to the two instruments revealed significant associations between certain types based on interests and preferences.…

  8. Eysenck Personality Questionnaire and Jungian Myers-Briggs Type Indicator Correlation of Extraversion-Introversion

    Science.gov (United States)

    Steele, Robert S.; Kelly, Thomas J.

    1976-01-01

    C. G. Jung and H. J. Eysenck developed concepts of extraversion-introversion from radically different theoretical orientations. It is hypothesized that given the methods and content similarity of the Eysenck Personality Questionnaire and the Myers-Briggs Type Indicator. Extraversion-Introversion scales of the inventories will be significantly…

  9. Interpreting the Myers-Briggs Type Indicator to Help Clients in Understanding Their Strong Interest Inventory.

    Science.gov (United States)

    Healy, Charles C.

    2000-01-01

    Scores of 370 adults on the Myers Briggs Type Indicator (MBTI) were correlated with General Occupational Theme (GOT) scores on the Strong Interest Inventory. Simple categorical MBTI scores were related modestly to Strong GOT scores as expected; individual continuous scores did not account for more variance in GOT than in categorical scores. (SK)

  10. The Validity of the Myers-Briggs Type Indicator for Predicting Expressed Marital Problems.

    Science.gov (United States)

    Douglass, Frazier M., IV; Douglass, Robin

    1993-01-01

    Examined assertions made concerning Myers-Briggs Type Indicator (MBTI) use with couples in marital therapy. Sixty-seven couples completed MBTI and questionnaire concerning marital problems. Results were not consistent with assertions found in MBTI literature. Few spouses in couples were same on all four preferences and number of opposite…

  11. Myers-Briggs Type Indicator Score Reliability across Studies: A Meta-Analytic Reliability.

    Science.gov (United States)

    Capraro, Robert M.; Capraro, Mary Margaret

    2002-01-01

    Submitted the Myers-Briggs Type Indicator (MBTI) to a descriptive reliability generalization analysis to characterize the variability of measurement error in MBTI scores across administrations. In general the MBTI and its scales yielded scores with strong internal consistency and test-retest reliability estimates. (SLD)

  12. A Comparison of Competing Models Underlying Responses to the Myers-Briggs Type Indicator.

    Science.gov (United States)

    Jackson, Stacy L.; And Others

    1996-01-01

    Factor analysis of 1,030 adults' responses on the Myers Briggs Type Indicator (MBTI) were used to test 4 alternative models. Results support a four-factor structure similar to the original Jungian structure. Elimination of 12 MBTI items was recommended. (SK)

  13. Comparison between Continuous Bipolar and Unipolar Ratings of the Myers-Briggs Type Indicator.

    Science.gov (United States)

    Tzeng, Oliver C. S.; And Others

    1991-01-01

    Measurement properties of two response formats (bipolar and unipolar ratings) in personality assessment were compared using data from 135 college students taking the Myers-Briggs Type Indicator (MBTI). Factorial validity and construct validity of the MBTI were supported. Reasons why the bipolar method is preferable are discussed. (SLD)

  14. A Construct Validity Study of the Myers-Briggs Type Indicator.

    Science.gov (United States)

    Cohen, David; And Others

    1981-01-01

    This study investigates the construct validity of the Myers-Briggs Type Indicator (MBTI) with the hope of clarifying contradictions in previous studies using similar methods. Subjects' type categories generated by the MBTI, self-typings, and typing by subjects' spouses were used. (Author/AL)

  15. Differences in Myers-Briggs Personality Types among High School Band, Orchestra, and Choir Members

    Science.gov (United States)

    MacLellan, Christin Reardon

    2011-01-01

    The purpose of this study was to explore personality type differences among high school band, string orchestra, and choir students according to ensemble membership. Participants (N = 355) were high school students who had participated in their school's band, orchestra, or choir for 1 year or more. The author administered the Myers-Briggs Type…

  16. Personality Characteristics of South Korean Students with Visual Impairments Using the Myers-Briggs Type Indicator

    Science.gov (United States)

    Bak, Sunhi

    2012-01-01

    Introduction: The study presented here was designed to determine whether there were significant differences in the frequency and preference scores of personality functions and the frequency of personality types, as measured by the Myers-Briggs Type Indicator (MBTI), by gender, school level, and level of visual function, of students with visual…

  17. On Oswaldella billardi Briggs, 1938 and O. erratum spec, nov., two antarctic hydroid species (Cnidaria, Hydrozoa)

    NARCIS (Netherlands)

    Peña Cantero, A.L.; Vervoort, W.

    1997-01-01

    The type material of Oswaldella billardi Briggs, 1938, has been re-examined and a complete description and figures are presented. The study of that material has allowed to reconsider the systematic position of all the material previously assigned to O. billardi and to determine that part of it

  18. An assessment of the Myers Briggs Type Indicator from a theological ...

    African Journals Online (AJOL)

    The aim of this article is to assess the Myers Briggs Type Indicator (MBTI®) from a Reformed perspective of a Trinitarian biblical hermeneutic of hope. It examines and assesses the compatibility of its assumptions with a theory of personhood derived from a Reformed perspective. It then suggests why it has made such an ...

  19. A Failure Criterion for Concrete

    DEFF Research Database (Denmark)

    Ottosen, N. S.

    1977-01-01

    A four-parameter failure criterion containing all the three stress invariants explicitly is proposed for short-time loading of concrete. It corresponds to a smooth convex failure surface with curved meridians, which open in the negative direction of the hydrostatic axis, and the trace in the devi......A four-parameter failure criterion containing all the three stress invariants explicitly is proposed for short-time loading of concrete. It corresponds to a smooth convex failure surface with curved meridians, which open in the negative direction of the hydrostatic axis, and the trace...

  20. Distance criterion for hydrogen bond

    Indian Academy of Sciences (India)

    First page Back Continue Last page Overview Graphics. Distance criterion for hydrogen bond. In a D-H ...A contact, the D...A distance must be less than the sum of van der Waals Radii of the D and A atoms, for it to be a hydrogen bond.

  1. Fatigue Criterion for System Design

    Science.gov (United States)

    Zeretsky, E. V.

    1986-01-01

    Report discusses principles of structural-life prediction. Generalized methodology developed for structural life prediction, design, and reliability, based upon fatigue criterion. Approach incorporates computed life of elemental stress volumes of complex machine elements to predict system life. Results of coupon fatigue testing incorporated into analysis, allowing for life prediction and component or structural renewal rates, with reasonable statistical certainty.

  2. Application of the Myers-Briggs Type Indicator to Medicine and Other Health Professions. Monograph I. Final Report.

    Science.gov (United States)

    McCaulley, Mary H.

    This monograph is an overview and state of the art paper for the use of the Myers-Briggs Type Indicator in the health professions. The Myers-Briggs Type Indicator is a questionnaire which makes it possible to test and put to practical use that part of the personality theory of C.G. Jung which is concerned with psychological type. Nine areas of…

  3. Over-representation of Myers Briggs Type Indicator introversion in social phobia patients.

    Science.gov (United States)

    Janowsky, D S; Morter, S; Tancer, M

    2000-01-01

    The purpose of this study is to profile the personalities of patients with social phobia. Sixteen patients with social phobia were compared with a normative population of 55,971, and with 24 hospitalized Major Depressive Disorder inpatients, using the Myers Briggs Type Indicator. The Myers Briggs Type Indicator, a popular personality survey, divides individuals into eight categories: Extroverts versus Introverts, Sensors versus Intuitives, Thinkers versus Feelers, and Judgers versus Perceivers. Social phobia patients were significantly more often Introverts (93.7%) than were subjects in the normative population (46.2%). In addition, using continuous scores, the social phobia patients scored as significantly more introverted than did the patients with Major Depressive Disorder, who also scored as Introverted. Introversion is a major component of social phobia, and this observation may have both etiological and therapeutic significance.

  4. Relationship of Myers Briggs type indicator personality characteristics to suicidality in affective disorder patients.

    Science.gov (United States)

    Janowsky, David S; Morter, Shirley; Hong, Liyi

    2002-01-01

    The current study characterized the Myers Briggs Type Indicator (MBTI) personality profiles of 64 suicidal and 30 non-suicidal psychiatric inpatients with affective disorder diagnoses. The MBTI divides individuals categorically into eight personality preferences (Extroverted and Introverted, Sensing and Intuitive, Thinking and Feeling, and Judging and Perceiving). Compared to the group of non-suicidal affective disorder patients, suicidal affective disorder patients were significantly more Introverted and Perceiving using ANCOVA analyses, and significantly more Introverted alone using Chi Square analyses.

  5. Ginzburg Criterion for Coulombic Criticality

    OpenAIRE

    Fisher, Michael E.; Lee, Benjamin P.

    1996-01-01

    To understand the range of close-to-classical critical behavior seen in various electrolytes, generalized Debye-Hueckel theories (that yield density correlation functions) are applied to the restricted primitive model of equisized hard spheres. The results yield a Landau-Ginzburg free-energy functional for which the Ginzburg criterion can be explicitly evaluated. The predicted scale of crossover from classical to Ising character is found to be similar in magnitude to that derived for simple f...

  6. Ginzburg Criterion for Coulombic Criticality

    Science.gov (United States)

    Fisher, Michael E.; Lee, Benjamin P.

    1996-10-01

    To understand the range of close-to-classical critical behavior seen in various electrolytes, generalized Debye-Hückel theories (that yield density correlation functions) are applied to the restricted primitive model of equisized hard spheres. The results yield a Landau-Ginzburg free-energy functional for which the Ginzburg criterion can be explicitly evaluated. The predicted scale of crossover from classical to Ising character is found to be similar in magnitude to that derived for simple fluids in comparable fashion. The consequences in relation to experiments are discussed briefly.

  7. On the Modified Barkhausen Criterion

    DEFF Research Database (Denmark)

    Lindberg, Erik; Murali, K.

    2016-01-01

    Oscillators are normally designed according to the Modified Barkhausen Criterion i.e. the complex pole pair is moved out in RHP so that the linear circuit becomes unstable. By means of the Mancini Phaseshift Oscillator it is demonstrated that the distortion of the oscillator may be minimized by i...... by introducing a nonlinear ”Hewlett Resistor” so that the complex pole-pair is in the RHP for small signals and in the LHP for large signals i.e. the complex pole pair of the instant linearized small signal model is moving around the imaginary axis in the complex frequency plane....

  8. Communicator image and Myers-Briggs Type Indicator extraversion-introversion.

    Science.gov (United States)

    Opt, Susan K; Loffredo, Donald A

    2003-11-01

    This study is an examination of the relationship between communicator image and Myers-Briggs Type Indicator (MBTI) dimensions of extraversion-introversion. The authors found that individuals who prefer extraversion tend to have a more positive communicator image than those who prefer introversion. The results of this study support other research results showing that personality preferences differ in communication behaviors and traits, which could have implications for the individual's comfort and success in society. Results of this research also support the contention that communication behavior has biological aspects.

  9. Myers-Briggs Type Indicators and Kirton Adaption-Innovation Inventory Correlations.

    Science.gov (United States)

    1994-04-01

    resist change. The person who has a natural preference for sensing probably would use the adjective "practical" in describing himself, while the intuitor... Astrologies ," Theology Today, page 292. 2. Ron Zemke, "Second Thoughts About the MBTI," Training, April 1993, page 43. 3. Otto Kroeger and Janet M. Theusen...March 1990): 30-32. Long, Thomas. "Myers-Briggs and Other Modern Astrologies ." Theology Today. 291-294. Reis, Dayr A. and John H. Button. "Bureaucracy and

  10. A Galois-Connection between Myers-Briggs' Type Indicators and Szondi's Personality Profiles

    OpenAIRE

    Kramer, Simon

    2014-01-01

    We propose a computable Galois-connection between Myers-Briggs' Type Indicators (MBTIs), the most widely-used personality measure for non-psychiatric populations (based on C.G. Jung's personality types), and Szondi's personality profiles (SPPs), a less well-known but, as we show, finer personality measure for psychiatric as well as non-psychiatric populations (conceived as a unification of the depth psychology of S. Freud, C.G. Jung, and A. Adler). The practical significance of our result is ...

  11. Normal Criterion Concerning Shared Values

    Directory of Open Access Journals (Sweden)

    Wei Chen

    2012-01-01

    Full Text Available We study normal criterion of meromorphic functions shared values, we obtain the following. Let F be a family of meromorphic functions in a domain D, such that function f∈F has zeros of multiplicity at least 2, there exists nonzero complex numbers bf,cf depending on f satisfying (i  bf/cf is a constant;  (iimin {σ(0,bf,σ(0,cf,σ(bf,cf≥m} for some m>0;  (iii  (1/cfk-1(f′k(z+f(z≠bfk/cfk-1 or (1/cfk-1(f′k(z+f(z=bfk/cfk-1⇒f(z=bf, then F is normal. These results improve some earlier previous results.

  12. Comparison of MMPI-A, Marks and Briggs, and MMPI-2 norms for juvenile delinquents.

    Science.gov (United States)

    Gumbiner, J; Arriaga, T; Stevens, A

    1999-06-01

    A study was conducted to compare scores of juvenile delinquents on the new MMPI-A to previous research and to compare 3 sets of norms for adolescents: the MMPI-A, the Marks-Briggs adolescent norms, and the MMPI-2 adult norms. Subjects, 11 boys and 11 girls, were hospitalized adolescents, aged 14 to 17 years, with a history of conduct problems. Analysis of MMPI-A scale scores for boys indicated elevated T-score means on scales F (64), Hs (64), Pd (65), Pa (68), Pt (68), Sc (70), and Ma (66). Mean T scores for girls on the MMPI-A were elevated on scales of F (62), Pd (64), and Sc (62). The findings that the mean T score for scales Pd, Sc, and Ma are elevated for this population is consistent with previous research on juvenile delinquents. In general, the MMPI-A scale elevations were lowest, followed by the Marks-Briggs norms. The MMPI-2 T-score means were the most elevated. One of the limitations of the present investigation is an extremely small sample. Until further research is conducted on larger samples, clinicians concerned about the different norms are encouraged to plot MMPI-A scores on both adolescent and adult norms. It is also recommended that the MMPI-A be included as part of an assessment battery with other objective tests, clinical observation, and patient report.

  13. The Myers-Briggs Type Indicator[R] and Mainstream Psychology: Analysis and Evaluation of an Unresolved Hostility

    Science.gov (United States)

    Lloyd, John B.

    2012-01-01

    The Myers-Briggs Type Indicator (MBTI[R]) is widely used as a staff-development tool in the business and voluntary sectors. Its Psychological Type approach is found to be a valuable aid to understanding self and others and thus to enhancing effective team-working. This continuing and growing popularity is surprising in view of the disdain with…

  14. "Presidential Address." Political Pawns in an Educational Endgame: Reflections on Bryant, Briggs, and Some Twentieth-Century School Questions

    Science.gov (United States)

    Graves, Karen

    2013-01-01

    "Newsweek" ran an article on "The Homosexual Teacher" in December 1978. At the end of a tumultuous two-year period framed by Anita Bryant's anti-gay campaign in South Florida and John Briggs' proposition to bar gay and lesbian educators from working in California public schools, reporters concluded, "Most homosexual…

  15. Validity Evidence for the Myers-Briggs Type Indicator as a Measure of Hemisphere Dominance: Another View.

    Science.gov (United States)

    Taggart, William M.; And Others

    1991-01-01

    Relationships among the scales of the Myers Briggs Type Indicator and the Human Information Processing Survey revealed in a study by S. C. Shiflett (1989) were reinvestigated in a study involving 554 college students (270 males and 284 females). One significant gender difference among the correlations was found. (SLD)

  16. The Learning Styles of Registered Nurse Baccalaureate Students Based on the Myers-Briggs Type Indicator: Implications for Teaching.

    Science.gov (United States)

    Wahl, Sharon C.

    This descriptive study proposed to use the Myers Briggs Type Indicator (MBTI) to identify the learning styles of registered nurses who have returned to school, and to recommend teaching strategies based on commonalities of their learning styles. The MBTI was administered to 240 registered nurses who were enrolled in either a leadership course in…

  17. The Myers-Briggs Type Indicator as a Tool to Facilitate Learning Outcomes for Team Building in the Classroom

    Science.gov (United States)

    Berry, Priscilla; Wood, Cindy; Thornton, Barry

    2007-01-01

    Globalization and domestic competition are forcing businesses to rethink the human resources utilization process, and one method for considering again this challenge is creating a team culture. One key to this process for human resources development is the understanding of how to create the most successful teams. The use of the Myers-Briggs Type…

  18. Incremental Validity of the Myers-Briggs Type Indicator in Predicting Academic Major Selection of Undecided University Students

    Science.gov (United States)

    Pulver, Chad A.; Kelly, Kevin R.

    2008-01-01

    This study examined the incremental validity of the Myers-Briggs Type Indicator (MBTI) as a predictor of academic major choice. Undecided university students were administered the MBTI and Strong Interest Inventory (SII). Their academic major choice was recorded at the end of their fourth semester and categorized as realistic, investigative,…

  19. Re-Engineering Your Office Environment: Matching Careers and Personality via the Myers-Briggs Type Indicator.

    Science.gov (United States)

    McPherson, Bill

    1995-01-01

    Provides a summary of the research on the use of the Myers-Briggs Type Indicator (MBTI) in the workplace with implications for the practical uses of the MBTI. Suggests using the MBTI to aid the office professional, office manager, and office employee in training, career counseling and planning, team building, organizational development, and…

  20. Considering Personality Type in Adult Learning: Using the Myers-Briggs Type Indicator in Instructor Preparation at PricewaterhouseCoopers

    Science.gov (United States)

    Daisley, Richard J.

    2011-01-01

    This article explores the feasibility of using the Myers-Briggs Type Indicator (MBTI) as a framework for instructor development in a professional services training environment. It explores the consistency of MBTI with common adult learning theory, addresses questions on MBTI's reliability and validity, and explores the applicability of MBTI to the…

  1. The Devil Is in the Detail Regarding the Efficacy of Reading Recovery: A Rejoinder to Schwartz, Hobsbaum, Briggs, and Scull

    Science.gov (United States)

    Reynolds, Meree; Wheldall, Kevin; Madelaine, Alison

    2009-01-01

    This rejoinder provides comment on issues raised by Schwartz, Hobsbaum, Briggs and Scull (2009) in their article about evidence-based practice and Reading Recovery (RR), written in response to Reynolds and Wheldall (2007). Particular attention is paid to the processes and findings of the What Works Clearinghouse evaluation of RR. The suggestion…

  2. The Multifactorial Nature of Extraversion-Introversion in the Myers-Briggs Type Indicator and Eysenck Personality Inventory.

    Science.gov (United States)

    Sipps, Gary J.; Alexander, Ralph A.

    1987-01-01

    The construct validity of extraversion-introversion was explored, as measured by the Myers Briggs Type Indicator (MBTI) and the Eysenck Personality Inventory. Findings supported the complexity of extraversion-introversion. Two MBTI scales, Extraversion Introversion and Judging Perceiving, were factorially valid measures of impulsivity…

  3. Criterion for surface contact deformation of metals

    NARCIS (Netherlands)

    Jamari, Jamari; Schipper, Dirk J.

    2007-01-01

    In most engineering applications, bulk plastic deformation of the surface is avoided. There is, however, no criterion for determining whether or not bulk plastic deformation occurs during the contact between rough surfaces. This paper presents a criterion for predicting the deformation behaviour of

  4. Determining stress management activities for various Myers-Briggs personality types.

    Directory of Open Access Journals (Sweden)

    Ghidella, J.

    2017-07-01

    Full Text Available Stress, a component of everyday life, can be detrimental to health. Previous research has shown an increase in studies on stress in recent years, but little on linking stress and personality type. Because of this, new and innovative research in stress management is of utmost importance. This study combined the personality type theory of Myers-Briggs with de-stressing activities to determine which personality types found which de-stressing activities the most effective. The study focused on teenagers to bring more light to their stress management. There were different correlations, but they were insignificant. A conclusive statement cannot be made about the original research question, but a plethora of useful information was still discovered. While the results were varied, the conclusion of this study was that it was possible to determine which activities would most benefit people with certain personality types.

  5. Bimodal score distributions and the Myers-Briggs Type Indicator: fact or artifact?

    Science.gov (United States)

    Bess, Tammy L; Harvey, Robert J

    2002-02-01

    We examined Myers-Briggs Type Indicator (MBTI) score distributions computed using item response theory (IRT) to assess the generalizability of earlier bimodality reports that have been cited in support of the "type" versus "trait" view of personality. Using the BILOG IRT program to score a sample of approximately 12,000 individuals who participated in leadership development programs, theta score distributions for the 4 dimensions of the MBTI computed using 10 (the BILOG default) versus 50 quadrature points were compared. Results indicated that past reports of bimodality were artifacts caused by BILOG's default use of a small number of quadrature points; when larger numbers of points were used, score distributions became strongly center-weighted. Although our findings are not supportive of the "type"-based hypothesis, the extremely high correlations between theta scores (rs > .996) suggest that no practical differences would be expected as a function of the number-of-quadrature-points decision.

  6. Myers Briggs Type Indicator and Tridimensional Personality Questionnaire differences between bipolar patients and unipolar depressed patients.

    Science.gov (United States)

    Janowsky, D S; Morter, S; Hong, L; Howe, L

    1999-12-01

    The current study was designed to compare personality differences between bipolar patients and unipolar depressed patients, as evaluated on the Myers Briggs Type Indicator (MBTI) and the Tridimensional Personality Questionnaire (TPQ). A group of bipolar and a group of unipolar depressed patients filled out the MBTI, the TPQ, the Beck Depression Inventory, and the CAGE questionnaire. The two groups were compared with each other as to responses on the above surveys, and subgroups of bipolar depressed and bipolar patients with manic symptoms were also compared. Bipolar patients were found to be significantly more extroverted (p = 0.004) and less judging (p = 0.007) on the MBTI. They were significantly more novelty seeking (p = 0.004) and less harm avoidant (p = 0.002) on the TPQ. Of the above differences, only the TPQ harm avoidance scale appeared strongly linked to the patients' level of depression. Significant differences in personality exist between bipolar disorder and unipolar depressed patients.

  7. Age, criterion flexibility, and item recognition.

    Science.gov (United States)

    North, Lione J; Olfman, Darlene; Caldera, Daniel R; Munoz, Emily; Light, Leah L

    2017-04-26

    We examined young and older adults' ability to flexibly adapt response criterion on a recognition test when the probability that a test item had been studied was cued by test color. One word color signaled that the probability of the test item being old was 70% and a second color signaled that the probability of the test item being new was 70%. Young and older adults demonstrated similar levels of criterion shifting in response to color cues. Moreover, although both young and older adults were slowed when test-item color incorrectly predicted test-item status, the extent of slowing did not differ across age group. Putative measures of cognitive control predicted recognition accuracy but not the degree to which criterion changed with test-item color. These results suggest that adaptive criterion shifting does not tax cognitive control or, if it does require effort, may be no more onerous for older than for young adults.

  8. The relationship between life satisfaction, self-consciousness, and the Myers-Briggs type inventory dimensions.

    Science.gov (United States)

    Harrington, R; Loffredo, D A

    2001-07-01

    The study was an investigation of the relationship between psychological well-being, life satisfaction, self-consciousness, and the four Myers-Briggs Type Indicator dimensions (MBTI; I. B. Myers & M. H. McCaulley, 1985). The participants were 97 college students (79 women and 18 men whose mean age was 31.4 years). All the students were administered four instruments, the Psychological Well-Being Inventory (C. D. Ryff, 1989), the Satisfaction With Life Scale (E. Diener, R. A. Emmons, R. J. Larsen, & S. Griffin, 1985), the Self-Consciousness Scale-Revised (M. F. Scheier & C. S. Carver, 1985), and the MBTI (Form G Self-Scoring). MANOVAs revealed significant differences on three of the four dimensions of the MBTI with extraverts showing higher psychological well-being and life satisfaction and lower self-consciousness than introverts. Intuition types scored higher in psychological well-being and lower in self-consciousness than Sensing types. Judging types scored higher in psychological well-being than Perceiving types. Correlational analyses showed that most dimensions of psychological well-being were negatively related to self-consciousness. The relationship between life satisfaction and personality variables is discussed.

  9. Pilot study of Myers Briggs Type Indicator personality profiling in emergency department senior medical staff.

    Science.gov (United States)

    Boyd, Russell; Brown, Terry

    2005-06-01

    To study the viability of using the Myers Briggs Type Indicator (MBTI) in senior ED medical staff and to examine what trends, if any, in personality types exist within the specialty. A pilot cross-sectional survey was undertaken during which a standard MBTI questionnaire was sent anonymously to a convenience sample of senior ED medical staff in Tasmania and South Australia. Completed surveys after a second mailing were analysed and the results collated. Of 82 senior ED medical staff surveyed, 68 returned completed questionnaires (response rate 83%). The single most common personality group in the cohort was the (Extrovert/Intuitive/Thinking/Judging) ENTJ type exhibited by 12 (17.7%, 95% CI 9.4-28.7%) clinicians in the cohort. This group is present at a rate of 3% in the general population. In terms of individual traits, Introversion was exhibited by 33 (48.5%, 95% CI 36.2-61%), Intuitive traits by 40 (58.8%, 95% CI 46.2-70.6%), Thinking traits by 40 (58.8%, 95% CI 46.2-70.6%) and Judging traits by 53 (77.9%, 95% CI 66.2-87.1%) of our cohort of senior ED medical staff. Our senior ED medical staff cohort suggests notable variations from the general population in terms of their MBTI profiles.

  10. The effect of counseling for interpersonal relationship using myers-briggs type indicator.

    Science.gov (United States)

    Jang, Seon Suk; Kim, Bong Jo; Ju, Young Tae; Woo, Hyang Ok; Han, Jae Hee; Cho, Gyeong Jae; Hong, Soon Chan

    2011-03-01

    There are large differences between medical school curricula and those of other disciplines and graduate schools. Counseling program is designed to help participants understand their innate tendencies and have indirect experiences with the 16 Myers-Briggs Type Indicator (MBTI) types, which can lead to better interpersonal relationships. The experimental and control groups, which were sampled randomly, comprised 34 students each. Each group was consisted of 17 females and 17 males. We implemented a counseling program (understanding oneself, understanding others) only to the experimental group, not the control group. The effects of the program were analyzed by t-test and analysis of covariance (ANCOVA). The data were analyzed using SPSS 17.0 Window. For the Human relationship scale as a whole, the experimental group showed an increase from 3.641 to 3.846 (p=0.001). With regard to the subcategories, satisfaction increased from 3.705 to 4.022 (p=0.000), trust increased from 3.480 to 3.715 (p=0.015), intimacy increased from 3.833 to 4.019 (p=0.007), and openness increased from 3.435 to 3.700 (p=0.006). This program improved interpersonal relationships by helping new students understand each other, build a rapport, and understand their personalities well with open minded attitudes. Their relationships gradually became more intimate than awkward through this program.

  11. Personality types of family practice residents as measured by the Myers-Briggs type indicator.

    Science.gov (United States)

    Harris, D L; Ebbert, P

    1985-01-01

    This study was initiated to test the hypothesis that individuals currently choosing family practice as a career are likely to have different personality types than those who previously pursued general practice. Incoming residents to the University of Utah Family Practice Residency Program were compared to a group of private primary care physicians serving rural areas. Personality types were determined by administering the Myers-Briggs Type Indicator to both groups. Results showed that the current resident group differed significantly from the primary care physician group and that the residents' personality types were similar to personality types of faculty in other studies. This raises the concern that many family practice residents may not choose to practice in underserved areas. Further studies need to follow personality types through medical school and residency training and into practice to help determine which prospective physicians are likely to choose a primary care career and a rural practice. This information may be useful in health manpower planning and in examining admissions policies of medical schools and residencies.

  12. The association between Myers-Briggs Type Indicator and Psychiatry as the specialty choice.

    Science.gov (United States)

    Yang, Chong; Richard, George; Durkin, Martin

    2016-02-06

    The purpose of this pilot study is to examine the association between Myers-Briggs Type Indicator (MBTI) and prospective psychiatry residents. Forty-six American medical schools were contacted and asked to participate in this study. Data were collected and an aggregated list was compiled that included the following information: date of MBTI administration, academic year, MBTI form/version, residency match information and student demographic information. The data includes 835 American medical students who completed the MBTI survey and matched into a residency training program in the United States. All analyses were performed using R 3.1.2. The probability of an introvert matching to a psychiatry residency is no different than that of an extravert (p= 0.30). The probability of an intuitive individual matching to a psychiatry residency is no different than that of a sensing type (p=0.20). The probability of a feeling type matching to a psychiatry residency is no different than that of a thinking type (p= 0.50). The probability of a perceiving type matching to a psychiatry residency is no different than that of a judging type (p= 0.60). Further analyses may elicit more accurate information regarding the personality profile of prospective psychiatry residents. The improvement in communication, team dynamics, mentor-mentee relationships and reduction in workplace conflicts are possible with the awareness of MBTI personality profiles.

  13. Aesthetical criterion in art and science

    CERN Document Server

    Milovanović, Miloš

    2016-01-01

    In the paper, the authors elaborate some recently published research concerning the originality of artworks in terms of self-organization in the complex systems physics. It has been demonstrated that the originality issue such conceived leads to the criterion of a substantial aesthetics whose applicability is not restricted to the fine arts domain only covering also physics, biology, cosmology and other fields construed in the complex systems terms. Moreover, it is about a truth criterion related to the traditional personality conception revealing the ontological context transcendent to the gnoseological dualism of subjective and objective reality that is characteristic of modern science and humanities. Thus, it is considered to be an aesthetical criterion substantiating art and science as well as the other developments of the postmodern era. Its impact to psychology, education, ecology, culture and other humanities is briefly indicated.

  14. Filamentary and hierarchical pictures - Kinetic energy criterion

    Science.gov (United States)

    Klypin, Anatoly A.; Melott, Adrian L.

    1992-01-01

    We present a new criterion for formation of second-generation filaments. The criterion called the kinetic energy ratio, KR, is based on comparison of peculiar velocities at different scales. We suggest that the clumpiness of the distribution in some cases might be less important than the 'coldness' or 'hotness' of the flow for formation of coherent structures. The kinetic energy ratio is analogous to the Mach number except for one essential difference. If at some scale KR is greater than 1, as estimated at the linear stage, then when fluctuations of this scale reach nonlinearity, the objects they produce must be anisotropic ('filamentary'). In the case of power-law initial spectra the kinetic ratio criterion suggests that the border line is the power-spectrum with the slope n = -1.

  15. Sampling Criterion for EMC Near Field Measurements

    DEFF Research Database (Denmark)

    Franek, Ondrej; Sørensen, Morten; Ebert, Hans

    2012-01-01

    An alternative, quasi-empirical sampling criterion for EMC near field measurements intended for close coupling investigations is proposed. The criterion is based on maximum error caused by sub-optimal sampling of near fields in the vicinity of an elementary dipole, which is suggested as a worst......-case representative of a signal trace on a typical printed circuit board. It has been found that the sampling density derived in this way is in fact very similar to that given by the antenna near field sampling theorem, if an error less than 1 dB is required. The principal advantage of the proposed formulation is its...

  16. Personality types of otolaryngology resident applicants as described by the Myers-Briggs Type Indicator.

    Science.gov (United States)

    Zardouz, Shawn; German, Michael A; Wu, Edward C; Djalilian, Hamid R

    2011-05-01

    To assess the personality types of applicants to a single otolaryngology residency program using the Myers- Briggs Type Indicator. The personality types were compared with those of the general population and with physicians in other medical specialties. Cross-sectional survey. University hospital. A personality survey was emailed to 327 resident physician applicants over 2 consecutive years (2008- 2009). Analysis was accomplished by calculating prevalence estimates. Of the 327 anonymous surveys, 137 were completed (response rate = 42%). The Introverted/Sensing/Thinking/ Judging personality type was the most prevalent (14.6%), representing 13% of the general population. Prospective applicants displayed mostly Extroverted (E; 58%), Sensing (S; 54%), Thinking (T; 62%), and Judging (J; 61%) personality traits. Of the 16 personality types, statistically significant differences were found between otolaryngology resident applicants and the general population only for the Extroverted/Sensing/Thinking/ Perceiving (P = .002) personality type after correcting for multiple comparisons. The Intuitive (N; 46%) and Feeling (F; 38%) types correlated closely with the reported personality types of those individuals in non–primary care specialties, 47% and 28%, respectively. Extroverted (E) and Thinking (T) individuals appeared to prefer surgical specialties, which occurred in 58% and 62% of the applicants, respectively. There were no significant differences between male and female applicants. This study examines the personality types of medical students applying to an otolaryngology residency. The results support a highly structured, data-driven teaching preference among applicants. These results may allow for a better understanding of the personalities of medical students who are interested in otolaryngology.

  17. The smoothness criterion as a trend diagnostic

    OpenAIRE

    P. Fogarty; Weber, N.C.

    2006-01-01

    The smoothness criterion is used in the design of symmetric moving average trend filters in time series and in graduation in actuarial studies. This measure of smoothness is used to motivate a diagnostic for determining the order of local polynomial trend.

  18. Early Stop Criterion from the Bootstrap Ensemble

    DEFF Research Database (Denmark)

    Hansen, Lars Kai; Larsen, Jan; Fog, Torben L.

    1997-01-01

    This paper addresses the problem of generalization error estimation in neural networks. A new early stop criterion based on a Bootstrap estimate of the generalization error is suggested. The estimate does not require the network to be trained to the minimum of the cost function, as required by ot...

  19. The definition and criterion of death.

    Science.gov (United States)

    Bernat, James L

    2013-01-01

    The definition and criterion of death have been rendered ambiguous by developments in organ support technology, particularly the positive-pressure ventilator and vasopressor medications, that uncouple the unitary loss of vital functions in death and create cases in which the brain has been destroyed while circulation and ventilation can be supported. Developing a biophilosophic analysis of the meaning of death before physicians can declare it requires four sequential steps: (1) agreement on the paradigm conditions that frame the analysis and clarify the task; (2) identifying the definition of death, which makes explicit the meaning of death that is accepted in our consensual usage of the term but that has become obscured by technology; (3) identifying the criterion of death that shows that the definition has been fulfilled, and that can be incorporated into a death statute; and (4) devising bedside tests of death for physicians to perform to satisfy the criterion. Although there is a strong consensus on death determination medical standards in countries around the world that has been enshrined into laws, and accepted by most societies and religions, there remains an active dispute among scholars on the precise definition and criterion of death. © 2013 Elsevier B.V. All rights reserved.

  20. Information criterion for the categorization quality evaluation

    Directory of Open Access Journals (Sweden)

    Michail V. Svirkin

    2011-05-01

    Full Text Available The paper considers the possibility of using the variation of information function as a quality criterion for categorizing a collection of documents. The performance of the variation of information function is being examined subject to the number of categories and the sample volume of the test document collection.

  1. A scale invariance criterion for LES parametrizations

    Directory of Open Access Journals (Sweden)

    Urs Schaefer-Rolffs

    2015-01-01

    Full Text Available Turbulent kinetic energy cascades in fluid dynamical systems are usually characterized by scale invariance. However, representations of subgrid scales in large eddy simulations do not necessarily fulfill this constraint. So far, scale invariance has been considered in the context of isotropic, incompressible, and three-dimensional turbulence. In the present paper, the theory is extended to compressible flows that obey the hydrostatic approximation, as well as to corresponding subgrid-scale parametrizations. A criterion is presented to check if the symmetries of the governing equations are correctly translated into the equations used in numerical models. By applying scaling transformations to the model equations, relations between the scaling factors are obtained by demanding that the mathematical structure of the equations does not change.The criterion is validated by recovering the breakdown of scale invariance in the classical Smagorinsky model and confirming scale invariance for the Dynamic Smagorinsky Model. The criterion also shows that the compressible continuity equation is intrinsically scale-invariant. The criterion also proves that a scale-invariant turbulent kinetic energy equation or a scale-invariant equation of motion for a passive tracer is obtained only with a dynamic mixing length. For large-scale atmospheric flows governed by the hydrostatic balance the energy cascade is due to horizontal advection and the vertical length scale exhibits a scaling behaviour that is different from that derived for horizontal length scales.

  2. The smoothness criterion as a trend diagnostic

    Directory of Open Access Journals (Sweden)

    2006-01-01

    Full Text Available The smoothness criterion is used in the design of symmetric moving average trend filters in time series and in graduation in actuarial studies. This measure of smoothness is used to motivate a diagnostic for determining the order of local polynomial trend.

  3. The smoothness criterion as a trend diagnostic

    Directory of Open Access Journals (Sweden)

    N. C. Weber

    2006-02-01

    Full Text Available The smoothness criterion is used in the design of symmetric moving average trend filters in time series and in graduation in actuarial studies. This measure of smoothness is used to motivate a diagnostic for determining the order of local polynomial trend.

  4. Criterion vs. Norm-referenced Testing.

    Science.gov (United States)

    Pimsleur, Paul

    1975-01-01

    A norm-referenced evaluation system, which evaluates the student in comparison to his peers, is rejected in favor of a criterion-referenced system. The latter, which rates the performance of a student on an absolute standard, makes for an individualized approach. Two kinds of tests are distinguished, the formative, administered during the course…

  5. The qualitative criterion of transient angle stability

    DEFF Research Database (Denmark)

    Lyu, R.; Xue, Y.; Xue, F.

    2015-01-01

    In almost all the literatures, the qualitative assessment of transient angle stability extracts the angle information of generators based on the swing curve. As the angle (or angle difference) of concern and the threshold value rely strongly on the engineering experience, the validity and robust...... that misjudgment would be taken if an angle (or angle difference) of concern departing from the concept of the controlling mode or a constant threshold value is used in the criterion....

  6. On the hodological criterion for homology

    Directory of Open Access Journals (Sweden)

    Macarena eFaunes

    2015-06-01

    Full Text Available Owen’s pre-evolutionary definition of a homologue as the same organ in different animals under every variety of form and function and its redefinition after Darwin as the same trait in different lineages due to common ancestry entail the same heuristic problem: how to establish sameness. Although different criteria for homology often conflict, there is currently a generalized acceptance of gene expression as the best criterion. This gene-centered view of homology results from a reductionist and preformationist concept of living beings. Here, we adopt an alternative organismic-epigenetic viewpoint, and conceive living beings as systems whose identity is given by the dynamic interactions between their components at their multiple levels of composition. We posit that there cannot be an absolute homology criterion, and instead, homology should be inferred from comparisons at the levels and developmental stages where the delimitation of the compared trait lies. In this line, we argue that neural connectivity, i.e., the hodological criterion, should prevail in the determination of homologies between brain supra-cellular structures, such as the vertebrate pallium.

  7. Social influences on adaptive criterion learning.

    Science.gov (United States)

    Cassidy, Brittany S; Dubé, Chad; Gutchess, Angela H

    2015-07-01

    People adaptively shift decision criteria when given biased feedback encouraging specific types of errors. Given that work on this topic has been conducted in nonsocial contexts, we extended the literature by examining adaptive criterion learning in both social and nonsocial contexts. Specifically, we compared potential differences in criterion shifting given performance feedback from social sources varying in reliability and from a nonsocial source. Participants became lax when given false positive feedback for false alarms, and became conservative when given false positive feedback for misses, replicating prior work. In terms of a social influence on adaptive criterion learning, people became more lax in response style over time if feedback was provided by a nonsocial source or by a social source meant to be perceived as unreliable and low-achieving. In contrast, people adopted a more conservative response style over time if performance feedback came from a high-achieving and reliable source. Awareness that a reliable and high-achieving person had not provided their feedback reduced the tendency to become more conservative, relative to those unaware of the source manipulation. Because teaching and learning often occur in a social context, these findings may have important implications for many scenarios in which people fine-tune their behaviors, given cues from others.

  8. Age Effects in Adaptive Criterion Learning.

    Science.gov (United States)

    Cassidy, Brittany S; Gutchess, Angela H

    2016-11-01

    Although prior work has examined age-related changes to criterion placement and flexibility, no study tested these constructs through a paradigm that employs adaptive feedback to encourage specific criterion changes. The goal of this study was to assess age differences in how young and older adults adapt and shift criteria in recognition memory decisions based on trial-by-trial feedback. Young and older adults completed an adaptive criterion learning paradigm. Over 3 study/test cycles, a biased feedback technique at test encouraged more liberal or strict responding by false-positive feedback toward false alarms or misses. Older adults were more conservative than young, even when feedback first encouraged a liberal response bias, and older adults adaptively placed criteria in response to biased feedback, much like young adults. After first being encouraged to respond conservatively, older adults shifted criteria less than young when feedback encouraged more lenient responding. These findings evidence labile adaptive criteria placement and criteria shifting with age. However, age-related tendencies toward conservative response biases may limit the extent to which criteria can be shifted in a lenient direction. © The Author 2015. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

  9. Examination of the relations of the Myers-Briggs type indicator and the NEO-4 Personality Inventory in a Polish sample.

    Science.gov (United States)

    Klinkosz, Waldemar; Iskra, Justyna

    2010-10-01

    The present study was designed to replicate McCrae and Costa's research findings on the relation of NEO-4 domains with the Myers-Briggs Type Indicator scales in a Polish sample of 300 psychology student volunteers (175 women, 125 men). Their mean age was 22.3 yr. (SD = 4.5). Correlations for scores on the MBTI scales with NEO-4 domains ranged from .72 to .02 for Extraversion, from -.60 to -.16 for Openness to experience, from -.56 to -.04 for Agreeableness, and from .55 to -.07 for Conscientiousness. Two domains assessed with the NEO-4 correspond to preferences measured by the Myers-Briggs Type Indicator.

  10. Model selection criterion in survival analysis

    Science.gov (United States)

    Karabey, Uǧur; Tutkun, Nihal Ata

    2017-07-01

    Survival analysis deals with time until occurrence of an event of interest such as death, recurrence of an illness, the failure of an equipment or divorce. There are various survival models with semi-parametric or parametric approaches used in medical, natural or social sciences. The decision on the most appropriate model for the data is an important point of the analysis. In literature Akaike information criteria or Bayesian information criteria are used to select among nested models. In this study,the behavior of these information criterion is discussed for a real data set.

  11. An improved criterion for Kapitza's pendulum stability

    Science.gov (United States)

    Butikov, Eugene I.

    2011-07-01

    An enhanced and more exact criterion for dynamic stabilization of the parametrically driven inverted pendulum is obtained: the boundaries of stability are determined with greater precision and are valid in a wider region of the system parameters than previous results. The lower boundary of stability is associated with the phenomenon of subharmonic resonances in this system. The relationship of the upper limit of dynamic stabilization of the inverted pendulum with ordinary parametric resonance (i.e. with destabilization of the lower equilibrium position) is established. Computer simulation of the physical system aids the analytical investigation and proves the theoretical results.

  12. Intrinsic ductility criterion for interfaces in solids

    Science.gov (United States)

    Thomson, Robb

    1995-09-01

    This paper explores the cleavage vs blunting dislocation emission from a crack on an interface in a two-dimensional simple hexagonal lattice for a variety of nearest-neighbor central force laws, and compares the results with elastic predictions of the criteria couched in terms of the interfacial surface energy, γs, and the unstable stacking fault, γus. The mode conversion characteristic of interfacial cracks is interpreted in terms of a local phase at the core of the crack, with a cutoff at the force law range parameter. The results are that the emission criterion has two regimes. When γs>3γus the emission criterion is proportional to the product, γsγus, while when γsChemical embrittlement of a crack is a direct consequence of these results, and is discussed. It is shown, however, that the localized interactions associated with chemical effects at a crack tip are inherently too complex to be encompassed in simple criteria such as these, and that quantitative predictions for chemical effects will require more detailed considerations of the specific lattice and bonding configurations in hand. But these results should serve usefully as ``rule of thumb'' guides.

  13. Holland's Vocational Preference Inventory and the Myers-Briggs Type Indicator as Predictors of Vocational Choice among Master's of Business Administration.

    Science.gov (United States)

    Martin, David C.; Bartol, Kathryn M.

    1986-01-01

    Tested the ability of Holland's Vocational Preference Inventory (VPI) and the Myers-Briggs Type Indicator (MBTI) to predict student business concentration. Significant discriminant analysis results were obtained for both instruments. Classification analyses supported the potential usefulness of the VPI for counseling students regarding…

  14. Teaching Teams To Be Teams: An Exercise Using the Myers-Briggs Type Indicator and the Five-Factor Personality Traits.

    Science.gov (United States)

    Clinebell, Sharon; Stecher, Mary

    2003-01-01

    Management students formed teams after completing exercises based on the Myers-Briggs Type Indicator and the Five-Factor Model of Personality. Team members examined how types and traits might affect performance. Most students indicated that understanding personality increased awareness of behavior. Teams that used extreme division of labor were…

  15. The Effects of Instructors and Students Myers-Briggs Type Indicator Characteristics on the Accuracy of Grades Predicted for an Introductory English Composition Course.

    Science.gov (United States)

    Schurr, Terry K.; And Others

    1986-01-01

    The effects of different instructors and student Myers-Briggs Type Inventory personality characteristics on the accuracy of predicting 1041 introductory English composition grades from a single regression equation were investigated. Results suggested that grades were inflated in classes with high means and deflated in classes with low means.…

  16. The Relationship between Personality Type and Software Usability Using the Myers-Briggs Type Indicator (MBTI) and the Software Usability Measurement Inventory (SUMI)

    Science.gov (United States)

    Lindsey, William H.

    2011-01-01

    The study attempted to determine if there is a relationship between user's psychological personality types, measured by the Myers Briggs Type Indicator[R] (MBTI[R]) and distinct measures of usability measured by the Software Usability Measurement Inventory (SUMI). The study was expected to provide an answer to the following basic research…

  17. Discriminant Validity Assessment: Use of Fornell & Larcker criterion versus HTMT Criterion

    Science.gov (United States)

    Hamid, M. R. Ab; Sami, W.; Mohmad Sidek, M. H.

    2017-09-01

    Assessment of discriminant validity is a must in any research that involves latent variables for the prevention of multicollinearity issues. Fornell and Larcker criterion is the most widely used method for this purpose. However, a new method has emerged for establishing the discriminant validity assessment through heterotrait-monotrait (HTMT) ratio of correlations method. Therefore, this article presents the results of discriminant validity assessment using these methods. Data from previous study was used that involved 429 respondents for empirical validation of value-based excellence model in higher education institutions (HEI) in Malaysia. From the analysis, the convergent, divergent and discriminant validity were established and admissible using Fornell and Larcker criterion. However, the discriminant validity is an issue when employing the HTMT criterion. This shows that the latent variables under study faced the issue of multicollinearity and should be looked into for further details. This also implied that the HTMT criterion is a stringent measure that could detect the possible indiscriminant among the latent variables. In conclusion, the instrument which consisted of six latent variables was still lacking in terms of discriminant validity and should be explored further.

  18. Fear and Fascination in the Big City: Rilke's Use of George Simmel in The Notebooks of Malte Laurids Brigge

    Directory of Open Access Journals (Sweden)

    Neil H. Donahue

    1992-06-01

    Full Text Available This essay examines Rainer Maria Rilke's The Notebooks of Malte Laurids Brigge (1910 as one corner in a triangle of reciprocal influence and affinity in early twentieth-century modernity consisting of Rilke, the sociologist Georg Simmel, and the art theorist Wilhelm Worringer. In the notes, this essay documents the biographical relations among the three, but in its text it demonstrates through textual analysis how Rilke's descriptions of Malte in Paris enact Simmel's categories of psychological response for man in the metropolis, as delineated in his essay "The Metropolis and Mental Life"(1903. Rilke's descriptions of Malte's attempts to overcome his fears of the metropolis coincide then with Worringer's thesis in his Abstraction and Empathy (1908 on the psychological origins of abstract art and Joseph Frank's later elaboration of that thesis into an aesthetics of spatial form.

  19. Focusing criterion in DHM image reconstruction

    Science.gov (United States)

    Mihailescu, M.; Mihale, N.; Popescu, R. C.; Acasandrei, A.; Paun, I. A.; Dinescu, M.; Scarlat, E.

    2015-02-01

    This study is presenting the theoretical approach and the practical results of a precise activity involved in the hologram reconstruction in order to find the optimally focused image of MG63 osteoblast-like cells cultivated on polymeric flat substrates. The morphology and dynamic of the cell is investigated by digital holographic microscopy (DHM) technique. The reconstruction is digitally performed using an algorithm based on the scalar theory of diffraction in the Fresnel approximation. The quality of the 3D images of the cells is crucially depending on the focusing capability of the reconstruction chain to fit the parameters of the optical recorder, particularly the focusing value. Our proposal to find the focused image is based on the images decomposition on gray levels and their histogram analysis. More precisely the focusing criterion is based on the evaluation of the form of this distribution.

  20. The criterion C in a parton model

    Energy Technology Data Exchange (ETDEWEB)

    Braun, M.; Pajares, C. (Dept. de Particulas Elementales, Univ. de Santiago de Compostela (Spain))

    1991-10-07

    There are certain classes of events which are screened in nuclei only by themselves. They satisfy some requirements denoted by criterion C. These events are studied in the framework of a general parton model. It is shown that, depending of the type of events, the cross section for them have contributions which do not depend only on the elementary C hadron-nucleon cross section but also on the total hadron-nucleon cross section. These corrections are proportional to the probability to have one of the spectator partons of the projectile in the phase-space region of the selected events. In this way, it is possible to explain the dependence on A of different processes like J/{psi} production, pA{yields}pX, hard processes and non-diffractive cross sections. (orig.).

  1. Extended equal areas criterion: foundations and applications

    Energy Technology Data Exchange (ETDEWEB)

    Yusheng, Xue [Nanjim Automation Research Institute, Nanjim (China)

    1994-12-31

    The extended equal area criterion (EEAC) provides analytical expressions for ultra fast transient stability assessment, flexible sensitivity analysis, and means to preventive and emergency controls. Its outstanding performances have been demonstrated by thousands upon thousands simulations on more than 50 real power systems and by on-line operation records in an EMS environment of Northeast China Power System since September 1992. However, the researchers have mainly based on heuristics and simulations. This paper lays a theoretical foundation of EEAC and brings to light the mechanism of transient stability. It proves true that the dynamic EEAC furnishes a necessary and sufficient condition for stability of multi machine systems with any detailed models, in the sense of the integration accuracy. This establishes a new platform for further advancing EEAC and better understanding of problems. An overview of EEAC applications in China is also given in this paper. (author) 30 refs.

  2. Nash equilibrium and multi criterion aerodynamic optimization

    Science.gov (United States)

    Tang, Zhili; Zhang, Lianhe

    2016-06-01

    Game theory and its particular Nash Equilibrium (NE) are gaining importance in solving Multi Criterion Optimization (MCO) in engineering problems over the past decade. The solution of a MCO problem can be viewed as a NE under the concept of competitive games. This paper surveyed/proposed four efficient algorithms for calculating a NE of a MCO problem. Existence and equivalence of the solution are analyzed and proved in the paper based on fixed point theorem. Specific virtual symmetric Nash game is also presented to set up an optimization strategy for single objective optimization problems. Two numerical examples are presented to verify proposed algorithms. One is mathematical functions' optimization to illustrate detailed numerical procedures of algorithms, the other is aerodynamic drag reduction of civil transport wing fuselage configuration by using virtual game. The successful application validates efficiency of algorithms in solving complex aerodynamic optimization problem.

  3. Unitary Evolution as a Uniqueness Criterion

    Science.gov (United States)

    Cortez, J.; Mena Marugán, G. A.; Olmedo, J.; Velhinho, J. M.

    2015-01-01

    It is well known that the process of quantizing field theories is plagued with ambiguities. First, there is ambiguity in the choice of basic variables describing the system. Second, once a choice of field variables has been made, there is ambiguity concerning the selection of a quantum representation of the corresponding canonical commutation relations. The natural strategy to remove these ambiguities is to demand positivity of energy and to invoke symmetries, namely by requiring that classical symmetries become unitarily implemented in the quantum realm. The success of this strategy depends, however, on the existence of a sufficiently large group of symmetries, usually including time-translation invariance. These criteria are therefore generally insufficient in non-stationary situations, as is typical for free fields in curved spacetimes. Recently, the criterion of unitary implementation of the dynamics has been proposed in order to select a unique quantization in the context of manifestly non-stationary systems. Specifically, the unitarity criterion, together with the requirement of invariance under spatial symmetries, has been successfully employed to remove the ambiguities in the quantization of linearly polarized Gowdy models as well as in the quantization of a scalar field with time varying mass, propagating in a static background whose spatial topology is either of a d-sphere (with d = 1, 2, 3) or a three torus. Following Ref. 3, we will see here that the symmetry and unitarity criteria allows for a complete removal of the ambiguities in the quantization of scalar fields propagating in static spacetimes with compact spatial sections, obeying field equations with an explicitly time-dependent mass, of the form ddot φ - Δ φ + s(t)φ = 0 . These results apply in particular to free fields in spacetimes which, like e.g. in the closed FRW models, are conformal to a static spacetime, by means of an exclusively time-dependent conformal factor. In fact, in such

  4. The Role of the Myers-Briggs Personality Type and Emotional Intelligence in Marital Satisfaction among Married Female Students at Tehran University.

    Science.gov (United States)

    Shirzad, Galin

    2016-10-01

    The present descriptive correlational study was conducted to predict the role of emotional intelligence and the Myers-Briggs personality type in marital satisfaction in married female students Tehran University in 2015. The study population consisted of all the married female students at Tehran University who visited Iran MBTI center between 22.04.2015 and 21.06.2015. A total of 140 students were selected as the study samples. Data were collected using the Myer-Briggs Type Indicator, the Bar-On Emotional Intelligence Questionnaire and the Enrich Marital Satisfaction Scale and were then analyzed in SPSS-20 using the multivariate regression analysis. The results obtained showed that emotional intelligence (interpersonal and intra-personal skills) and personality type (extraverted and structured) can predict marital satisfaction.

  5. Suboptimal Criterion Learning in Static and Dynamic Environments.

    Directory of Open Access Journals (Sweden)

    Elyse H Norton

    2017-01-01

    Full Text Available Humans often make decisions based on uncertain sensory information. Signal detection theory (SDT describes detection and discrimination decisions as a comparison of stimulus "strength" to a fixed decision criterion. However, recent research suggests that current responses depend on the recent history of stimuli and previous responses, suggesting that the decision criterion is updated trial-by-trial. The mechanisms underpinning criterion setting remain unknown. Here, we examine how observers learn to set a decision criterion in an orientation-discrimination task under both static and dynamic conditions. To investigate mechanisms underlying trial-by-trial criterion placement, we introduce a novel task in which participants explicitly set the criterion, and compare it to a more traditional discrimination task, allowing us to model this explicit indication of criterion dynamics. In each task, stimuli were ellipses with principal orientations drawn from two categories: Gaussian distributions with different means and equal variance. In the covert-criterion task, observers categorized a displayed ellipse. In the overt-criterion task, observers adjusted the orientation of a line that served as the discrimination criterion for a subsequently presented ellipse. We compared performance to the ideal Bayesian learner and several suboptimal models that varied in both computational and memory demands. Under static and dynamic conditions, we found that, in both tasks, observers used suboptimal learning rules. In most conditions, a model in which the recent history of past samples determines a belief about category means fit the data best for most observers and on average. Our results reveal dynamic adjustment of discrimination criterion, even after prolonged training, and indicate how decision criteria are updated over time.

  6. Personality Type Analysis of Air Force Institute of Technology School of Systems and Logistics Graduate Degree 85S Class Using Myers-Briggs Type Indicator.

    Science.gov (United States)

    1985-09-01

    presentation of the resulting sixteen types is: 13 A ISTJ ISFJ INFJ INTJ ISTP ISFP INFP INTP ESTP ESFP ENFP ENTP ESTJ ESFJ ENFJ ENTJ In-depth...the four type description presented would correspond to an ISTJ, ESTP, INFJ, and an ENFP . The students were required to rank order the four...Psychological Type (CAPT) data base. CAPT, an organization supporting the use of the Myers-Briggs Type Indicator, maintains an extensive data base of MBTI

  7. Student Preferences and Performance in Online and Face-to-Face Classes Using Myers-Briggs Indicator: A Longitudinal Quasi-Experimental Study

    OpenAIRE

    Seta Boghikian-Whitby; Yehia Mortagy

    2016-01-01

    This longitudinal, quasi-experimental study investigated students’ cognitive personality type using the Myers-Briggs personality Type Indicator (MBTI) in Internet-based Online and Face-to-Face (F2F) modalities. A total of 1154 students enrolled in 28 Online and 32 F2F sections taught concurrently over a period of fourteen years. The study measured whether the sample is similar to the national average percentage frequency of all 16 different personality types; whether specific personality ty...

  8. The utility of the Myers-Briggs type indicator and the strong interest inventory in predicting service community selection at the United States Naval Academy

    OpenAIRE

    Bowers, Kendra M.

    2002-01-01

    Approved for public release; distribution is unlimited. This study provides information for those individuals responsible for guiding midshipmen's choice of naval service community. This research is focused on individuals who received their first community choice. Myers-Briggs Type Indicator results and career and technical interest measures based on the Strong Interest Inventory from the Naval Academy classes of 1998-2001 were analyzed using discriminant analysis. This project was designe...

  9. Criterion-referenced measurement: Its main applications, problems and findings

    NARCIS (Netherlands)

    van der Linden, Willem J.

    1982-01-01

    The need for criterion-referenced measurements has mainly arisen from the introduction of instructional programs organized according to modern principles from educational technology. Some of these programs are discussed, and it is indicated for what purposes criterion-referenced measurements are

  10. Criterion-Related Validity: Assessing the Value of Subscores

    Science.gov (United States)

    Davison, Mark L.; Davenport, Ernest C., Jr.; Chang, Yu-Feng; Vue, Kory; Su, Shiyang

    2015-01-01

    Criterion-related profile analysis (CPA) can be used to assess whether subscores of a test or test battery account for more criterion variance than does a single total score. Application of CPA to subscore evaluation is described, compared to alternative procedures, and illustrated using SAT data. Considerations other than validity and reliability…

  11. Confinement criterion for gauge theories with matter fields

    Science.gov (United States)

    Greensite, Jeff; Matsuyama, Kazue

    2017-11-01

    A generalization of the Wilson loop area-law criterion, which is applicable to gauge theories with matter in the fundamental representation of the gauge group, is proposed. This new criterion, like the area law, is stronger than the statement that asymptotic particle states are massive color singlets, which holds even for theories described by the Brout-Englert-Higgs mechanism.

  12. Some necessary and sufficient conditions for Hypercyclicity Criterion

    Indian Academy of Sciences (India)

    R. Narasimhan (Krishtel eMaging) 1461 1996 Oct 15 13:05:22

    This criterion has been used to show that certain classes of composition operators [6], weighted shifts [21], adjoints of multiplication operators [7], and adjoints of subnormal and hyponor- mal operators [5], are hypercyclic. Hypercyclicity has also been established in various other settings by means of this criterion [1,4,6,8,12 ...

  13. Criterion-Referenced Measurement: Half a Century Wasted?

    Science.gov (United States)

    Popham, W. James

    2014-01-01

    Fifty years ago, Robert Glaser introduced the concept of criterion-referenced measurement in an article in American Psychologist. Its early proponents predicted that this measurement strategy would revolutionize education. But has it lived up to its promise? W. James Popham explores this question by looking at the history of criterion-referenced…

  14. Criterion I: Soil and water conservation on rangelands [Chapter 2

    Science.gov (United States)

    Michael G. (Sherm) Karl; Paul T. Tueller; Gerald E. Schuman; Mark R. Vinson; James L. Fogg; Ronald W. Shafer; David A. Pyke; D. Terrance Booth; Steven J. Borchard; William G. Ypsilantis; Richard H. Barrett

    2010-01-01

    The Sustainable Rangelands Roundtable (SRR) has explicitly included conservation and maintenance of soil and water resources as a criterion of rangeland sustainability. Within the soil/water criterion, 10 indicators ­ five soil-based and five water-based - were developed through the expert opinions of rangeland scientists, rangeland management agency personnel, non-...

  15. Modified Schur-Cohn Criterion for Stability of Delayed Systems

    Directory of Open Access Journals (Sweden)

    Juan Ignacio Mulero-Martínez

    2015-01-01

    Full Text Available A modified Schur-Cohn criterion for time-delay linear time-invariant systems is derived. The classical Schur-Cohn criterion has two main drawbacks; namely, (i the dimension of the Schur-Cohn matrix generates some round-off errors eventually resulting in a polynomial of s with erroneous coefficients and (ii imaginary roots are very hard to detect when numerical errors creep in. In contrast to the classical Schur-Cohn criterion an alternative approach is proposed in this paper which is based on the application of triangular matrices over a polynomial ring in a similar way as in the Jury test of stability for discrete systems. The advantages of the proposed approach are that it halves the dimension of the polynomial and it only requires seeking real roots, making this modified criterion comparable to the Rekasius substitution criterion.

  16. Physician personality types in physical medicine and rehabilitation as measured by the Myers-Briggs Type Indicator.

    Science.gov (United States)

    Sliwa, J A; Shade-Zeldow, Y

    1994-01-01

    Personality is one variable that correlates with specialty selection and practice type. To test our hypothesis that there has been a change in the personality type of those entering Physical Medicine and Rehabilitation (PM&R) and to identify the academic potential of those in rehabilitation, we invited all residents and graduates of our training program to participate in a study of personality types within PM&R by completing a Myers-Briggs Type Indicator (MBTI). Thirty residents and 48 graduates completed the questionnaire. A wide range of personality types were represented in our sample. The most common types are shared by a number of other people-oriented, primary care specialties. There was a statistically significant difference between residents and graduates on two of the four MBTI indexes, with graduates more introverted (P < 0.05) and judging (P < 0.001) than the present residents. Intuition, previously correlated with research and academic practice, was the dominant process for the majority of graduates and residents. This would confirm, according to type theory, the academic potential of both graduates and residents in our training program.

  17. Failure Criterion for Brick Masonry: A Micro-Mechanics Approach

    Directory of Open Access Journals (Sweden)

    Kawa Marek

    2015-02-01

    Full Text Available The paper deals with the formulation of failure criterion for an in-plane loaded masonry. Using micro-mechanics approach the strength estimation for masonry microstructure with constituents obeying the Drucker-Prager criterion is determined numerically. The procedure invokes lower bound analysis: for assumed stress fields constructed within masonry periodic cell critical load is obtained as a solution of constrained optimization problem. The analysis is carried out for many different loading conditions at different orientations of bed joints. The performance of the approach is verified against solutions obtained for corresponding layered and block microstructures, which provides the upper and lower strength bounds for masonry microstructure, respectively. Subsequently, a phenomenological anisotropic strength criterion for masonry microstructure is proposed. The criterion has a form of conjunction of Jaeger critical plane condition and Tsai-Wu criterion. The model proposed is identified based on the fitting of numerical results obtained from the microstructural analysis. Identified criterion is then verified against results obtained for different loading orientations. It appears that strength of masonry microstructure can be satisfactorily described by the criterion proposed.

  18. Robust Hammerstein Adaptive Filtering under Maximum Correntropy Criterion

    Directory of Open Access Journals (Sweden)

    Zongze Wu

    2015-10-01

    Full Text Available The maximum correntropy criterion (MCC has recently been successfully applied to adaptive filtering. Adaptive algorithms under MCC show strong robustness against large outliers. In this work, we apply the MCC criterion to develop a robust Hammerstein adaptive filter. Compared with the traditional Hammerstein adaptive filters, which are usually derived based on the well-known mean square error (MSE criterion, the proposed algorithm can achieve better convergence performance especially in the presence of impulsive non-Gaussian (e.g., α-stable noises. Additionally, some theoretical results concerning the convergence behavior are also obtained. Simulation examples are presented to confirm the superior performance of the new algorithm.

  19. On the reduction criterion for random quantum states

    Energy Technology Data Exchange (ETDEWEB)

    Jivulescu, Maria Anastasia, E-mail: maria.jivulescu@upt.ro; Lupa, Nicolae, E-mail: nicolae.lupa@upt.ro [Department of Mathematics, Politehnica University of Timişoara, Victoriei Square 2, 300006 Timişoara (Romania); Nechita, Ion, E-mail: nechita@irsamc.ups-tlse.fr [CNRS, Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, UPS, F-31062 Toulouse (France)

    2014-11-15

    In this paper, we study the reduction criterion for detecting entanglement of large dimensional bipartite quantum systems. We first obtain an explicit formula for the moments of a random quantum state to which the reduction criterion has been applied. We show that the empirical eigenvalue distribution of this random matrix converges strongly to a limit that we compute, in three different asymptotic regimes. We then employ tools from free probability theory to study the asymptotic positivity of the reduction operators. Finally, we compare the reduction criterion with other entanglement criteria, via thresholds.

  20. Breakdown of universal Lindemann criterion in the melting of ...

    Indian Academy of Sciences (India)

    MSD) of a particle of crystalline solid exceeds a threshold value. This is known as the Lindemann criterion, first introduced in the year of 1910 by Lindemann. However, Chakravarty et al., demonstrated that this common wisdom is ...

  1. Frequency-domain criterion for the chaos synchronization of time ...

    Indian Academy of Sciences (India)

    domain criterion for ... Wu1 2 Yun Chen1. College of Electronic Engineering, Naval University of Engineering, Wuhan 430033, People's Republic of China; Guangzhou Naval Marine Academy, Guangzhou 510430, People's Republic of China ...

  2. Numerical and Experimental Validation of a New Damage Initiation Criterion

    Science.gov (United States)

    Sadhinoch, M.; Atzema, E. H.; Perdahcioglu, E. S.; van den Boogaard, A. H.

    2017-09-01

    Most commercial finite element software packages, like Abaqus, have a built-in coupled damage model where a damage evolution needs to be defined in terms of a single fracture energy value for all stress states. The Johnson-Cook criterion has been modified to be Lode parameter dependent and this Modified Johnson-Cook (MJC) criterion is used as a Damage Initiation Surface (DIS) in combination with the built-in Abaqus ductile damage model. An exponential damage evolution law has been used with a single fracture energy value. Ultimately, the simulated force-displacement curves are compared with experiments to validate the MJC criterion. 7 out of 9 fracture experiments were predicted accurately. The limitations and accuracy of the failure predictions of the newly developed damage initiation criterion will be discussed shortly.

  3. A modified failure criterion for transversely isotropic rocks

    Directory of Open Access Journals (Sweden)

    Omid Saeidi

    2014-03-01

    Full Text Available A modified failure criterion is proposed to determine the strength of transversely isotropic rocks. Mechanical properties of some metamorphic and sedimentary rocks including gneiss, slate, marble, schist, shale, sandstone and limestone, which show transversely isotropic behavior, were taken into consideration. Afterward, introduced triaxial rock strength criterion was modified for transversely isotropic rocks. Through modification process an index was obtained that can be considered as a strength reduction parameter due to rock strength anisotropy. Comparison of the parameter with previous anisotropy indexes in literature showed reasonable results for the studied rock samples. The modified criterion was compared to modified Hoek-Brown and Ramamurthy criteria for different transversely isotropic rocks. It can be concluded that the modified failure criterion proposed in this study can be used for predicting the strength of transversely isotropic rocks.

  4. Criterion-referenced measurement for educational evaluation and selection

    OpenAIRE

    Wikström, Christina

    2005-01-01

    In recent years, Sweden has adopted a criterion-referenced grading system, where the grade outcome is used for several purposes, but foremost for educational evaluation on student- and school levels as well as for selection to higher education. This thesis investigates the consequences of using criterion-referenced measurement for both educational evaluation and selection purposes. The thesis comprises an introduction and four papers that empirically investigate school grades and grading prac...

  5. Trace Ratio Criterion for Feature Extraction in Classification

    Directory of Open Access Journals (Sweden)

    Guoqi Li

    2014-01-01

    Full Text Available A generalized linear discriminant analysis based on trace ratio criterion algorithm (GLDA-TRA is derived to extract features for classification. With the proposed GLDA-TRA, a set of orthogonal features can be extracted in succession. Each newly extracted feature is the optimal feature that maximizes the trace ratio criterion function in the subspace orthogonal to the space spanned by the previous extracted features.

  6. Criterion of sheath formation in magnetized low pressure plasma

    Science.gov (United States)

    Moulick, R.; Adhikari, S.; Goswami, K. S.

    2017-11-01

    A criterion of sheath formation is obtained for magnetized low pressure plasmas. The criterion includes the effect of both collision and the magnetic field. The collision parameter is defined by the ratio of the ionization length to the ion mean free path. The ionization frequency is assumed to be constant. The condition obtained is consistent with the electrostatic case. In the absence of the magnetic field and the collision, it retrieves the Bohm criterion at the sheath edge. For an electrostatic case in the absence of ion neutral collision, the Bohm criterion determines the ion entry speed within the sheath. However, the presence of collision limits the validity of the criterion to a threshold value of the collision parameter. In the magnetized scenario, the validity is found to be dependent on the magnetic field angle besides the collision parameter. Even in a collisionless scenario, the validity is in question depending on the field angle. A critical collision parameter is found for a definite magnetic field strength beyond which there is no more angle dependency on the validity criterion. The effect of the magnetic field on the space charge deposition is highlighted.

  7. TABU SEARCH WITH ASPIRATION CRITERION FOR THE TIMETABLING PROBLEM

    Directory of Open Access Journals (Sweden)

    Oscar Chávez-Bosquez

    2015-01-01

    Full Text Available The aspiration criterion is an imperative element in the Tabu Search, with aspiration-by-default and the aspiration-by-objective the mainly used criteria in the literature. In this paper a new aspiration criterion is proposed in order to implement a probabilistic function when evaluating an element classified as tabu which improves the current solution, the proposal is called Tabu Search with Probabilistic Aspiration Criterion (BT- CAP. The test case used to evaluate the performance of the Probabilistic Aspiration Criterion proposed consists on the 20 instances of the problem described in the First International Timetabling Competition. The results are compared with 2 additional variants of the Tabu Search Algorithm: Tabu Search with Default Aspiration Criterion (BT-CAD and Tabu Search with Objective Aspiration Criterion (BT-CAO. Wilcoxon test was applied to the generated results, and it was proved with 99 % confidence that BT-CAP algorithm gets better solutions than the two other variants of the Tabu Search algorithm.

  8. A comparison of music education and music therapy majors: personality types as described by the Myers-Briggs Type Indicator and demographic profiles.

    Science.gov (United States)

    Steele, Anita Louise; Young, Sylvester

    2008-01-01

    The purpose of this study was to develop both personality and demographic profiles for students who are interested in majoring in music education or music therapy. Two primary questions were addressed in the study: (a) Are there similarities and differences in the personality types of music education and music therapy majors as measured by the Myers Briggs Type Indicator (MBTI )? (b) Are there similarities and differences in demographic characteristics of music education and music therapy majors in regard to (i) principal instrument studied in college, (ii) grade point average, (iii) scholarship awards, (iv) high school participation in private study and (v) ensembles, (vi) church/community participation, and (vii) volunteerism in high school?

  9. Risk acceptance criterion for tanker oil spill risk reduction measures.

    Science.gov (United States)

    Psarros, George; Skjong, Rolf; Vanem, Erik

    2011-01-01

    This paper is aimed at investigating whether there is ample support for the view that the acceptance criterion for evaluating measures for prevention of oil spills from tankers should be based on cost-effectiveness considerations. One such criterion can be reflected by the Cost of Averting a Tonne of oil Spilt (CATS) whereas its target value is updated by elaborating the inherent uncertainties of oil spill costs and establishing a value for the criterion's assurance factor. To this end, a value of $80,000/t is proposed as a sensible CATS criterion and the proposed value for the assurance factor F=1.5 is supported by the retrieved Protection and Indemnity (P&I) Clubs' Annual Reports. It is envisaged that this criterion would allow the conversion of direct and indirect costs into a non-market value for the optimal allocation of resources between the various parties investing in shipping. A review of previous cost estimation models on oil spills is presented and a probability distribution (log-normal) is fitted on the available oil spill cost data, where it should be made abundantly clear that the mean value of the distribution is used for deriving the updated CATS criterion value. However, the difference between the initial and the updated CATS criterion in the percentiles of the distribution is small. It is found through the current analysis that results are partly lower than the predicted values from the published estimation models. The costs are also found to depend on the type of accident, which is in agreement with the results of previous studies. Other proposals on acceptance criteria are reviewed and it is asserted that the CATS criterion can be considered as the best candidate. Evidence is provided that the CATS approach is practical and meaningful by including examples of successful applications in actual risk assessments. Finally, it is suggested that the criterion may be refined subject to more readily available cost data and experience gained from future

  10. Does the World Health Organization criterion adequately define glaucoma blindness?

    Directory of Open Access Journals (Sweden)

    Mokhles P

    2017-03-01

    Full Text Available P Mokhles, JSAG Schouten, HJM Beckers, CAB Webers University Eye Clinic Maastricht, Maastricht, the Netherlands Purpose: Blindness in glaucoma is difficult to assess with merely the use of the current World Health Organization (WHO definition (a visual field restricted to 10° in a radius around central fixation, as this criterion does not cover other types of visual field loss that are encountered in clinical practice and also depict blindness. In this study, a 5-point ordinal scale was developed for the assessment of common visual field defect patterns, with the purpose of comparing blindness as outcome to the findings with the WHO criterion when applied to the same visual fields. The scores with the two methods were compared between two ophthalmologists. In addition, the variability between these assessors in assessing the different visual field types was determined.Methods: Two glaucoma specialists randomly assessed a sample of 423 visual fields from 77 glaucoma patients, stripped of all indices and masked for all patient variables. They applied the WHO criterion and a 5-point ordinal scale to all visual fields for the probability of blindness.Results: The WHO criterion was mostly found applicable and in good agreement for both assessors to visual fields depicting central island of vision or a temporal crescent. The percentage of blindness scores was higher when using the ordinal scale, 21.7% and 19.6% for assessors A and B, respectively, versus 14.4% and 11.3% for the WHO criterion. However, Kappa was lower, 0.71 versus 0.78 for WHO.Conclusions: The WHO criterion is strictly applied and shows good agreement between assessors; however, blindness does not always fit this criterion. More visual fields are labeled as blind when a less stringent criterion is used, but this leads to more interobserver variability. A new criterion that describes the extent, location, and depth of visual field defects together with their consequence for the

  11. Dubious decision evidence and criterion flexibility in recognition memory

    Directory of Open Access Journals (Sweden)

    Justin eKantner

    2015-09-01

    Full Text Available When old-new recognition judgments must be based on ambiguous memory evidence, a proper criterion for responding old can substantially improve accuracy, but participants are typically suboptimal in their placement of decision criteria. Various accounts of suboptimal criterion placement have been proposed. The most parsimonious, however, is that subjects simply over-rely on memory evidence – however faulty – as a basis for decisions. We tested this account with a novel recognition paradigm in which old-new discrimination was minimal and critical errors were avoided by adopting highly liberal or conservative biases. In Experiment 1, criterion shifts were necessary to adapt to changing target probabilities or, in a security patrol scenario, to avoid either letting dangerous people go free (misses or harming innocent people (false alarms. Experiment 2 added a condition in which financial incentives drove criterion shifts. Critical errors were frequent, similar across sources of motivation, and only moderately reduced by feedback. In Experiment 3, critical errors were only modestly reduced in a version of the security patrol with no study phase. These findings indicate that participants use even transparently non-probative information as an alternative to heavy reliance on a decision rule, a strategy that precludes optimal criterion placement.

  12. Stability criterion and its calculation for sail-assisted ship

    Directory of Open Access Journals (Sweden)

    Yihuai Hu

    2015-01-01

    Full Text Available Stability criterion and its calculation are the crucial issue in the application of sail-assisted ship. How- ever, there is at present no specific criterion and computational methods for the stability of sail-assisted ship. Based on the stability requirements for seagoing ships, the stability criterion of the sail-assisted ships is suggested in this paper. Furthermore, how to calculate the parameters and determine some specific coefficients for the ship stability calculation, as well as how to redraw stability curve are also discussed in this paper. Finally, to give an illustration, the proposed method is applied on a sail assisted-ship model with comments and recommendations for improvement.

  13. Stability criterion and its calculation for sail-assisted ship

    Directory of Open Access Journals (Sweden)

    Hu Yihuai

    2015-01-01

    Full Text Available Stability criterion and its calculation are the crucial issue in the application of sail-assisted ship. How- ever, there is at present no specific criterion and computational methods for the stability of sail-assisted ship. Based on the stability; requirements for seagoing ships, the stability criterion of the sail-assisted ships is suggested in this paper. Furthermore, how to calculate the parameters and determine some specific coefficients for the ship stability; calculation, as well as how to redraw stability! curve are also discussed in this paper. Finally, to give an illustration, the proposed method is applied on a sail assisted-ship model with comments and recommendations for improvement.

  14. A Joint Optimization Criterion for Blind DS-CDMA Detection

    Directory of Open Access Journals (Sweden)

    Sergio A. Cruces-Alvarez

    2007-01-01

    Full Text Available This paper addresses the problem of the blind detection of a desired user in an asynchronous DS-CDMA communications system with multipath propagation channels. Starting from the inverse filter criterion introduced by Tugnait and Li in 2001, we propose to tackle the problem in the context of the blind signal extraction methods for ICA. In order to improve the performance of the detector, we present a criterion based on the joint optimization of several higher-order statistics of the outputs. An algorithm that optimizes the proposed criterion is described, and its improved performance and robustness with respect to the near-far problem are corroborated through simulations. Additionally, a simulation using measurements on a real software-radio platform at 5 GHz has also been performed.

  15. Generalized measurable ignition criterion for inertial confinement fusion.

    Science.gov (United States)

    Chang, P Y; Betti, R; Spears, B K; Anderson, K S; Edwards, J; Fatenejad, M; Lindl, J D; McCrory, R L; Nora, R; Shvarts, D

    2010-04-02

    A multidimensional measurable criterion for central ignition of inertial-confinement-fusion capsules is derived. The criterion accounts for the effects of implosion nonuniformities and depends on three measurable parameters: the neutron-averaged total areal density (rhoR(n)(tot)), the ion temperature (T(n)), and the yield over clean (YOC=ratio of the measured neutron yield to the predicted one-dimensional yield). The YOC measures the implosion uniformity. The criterion can be approximated by chi=(rhoR(n)(tot))(0.8) x (T(n)/4.7)(1.7)YOC(mu)>1 (where rhoR is in g cm(-2), T in keV, and mu approximately 0.4-0.5) and can be used to assess the performance of cryogenic implosions on the NIF and OMEGA. Cryogenic implosions on OMEGA have achieved chi approximately 0.02-0.03.

  16. SOCIO-PSYCHOLOGICAL CRITERIONS OF FAMILY LIFESTYLE TYPOLOGY

    Directory of Open Access Journals (Sweden)

    Yekaterina Anatolievna Yumkina

    2015-02-01

    Full Text Available The purpose of this article is to present socio-psychological criterions of family lifestyle typology, which were found during theoretical modelling and empirical research work. It is important in fundamental and practical aspects. St-Petersburg students (n = 116, from 19 to 21 years old were examined by special questionnaire «Family relationship and home» (Kunitsi-na V.N., Yumkina Ye.A., 2012 which measures different aspects of family lifestyle. We also used complex of methods that gave us information about personal values, self-rating and parent-child relationships. Dates were divided into six groups according to three main criterions of family lifestyle typology: social environment of family life, family activity, and family interpersonal relationships. There were found statistically significant differences between pairs of group from every criterions. The results can be useful in spheres dealing with family crisis, family development, family traditions etc.

  17. A bilinear failure criterion for mixed-mode delamination

    Science.gov (United States)

    Reeder, James R.

    1993-01-01

    Many different failure criteria have been suggested for mixed-mode delamination toughness, but few sets of mixed-mode data exist that are consistent over the full range of Mode 1 opening load to Mode 2 shear load range. The mixed-mode bending (MMB) test was used to measure the delamination toughness of a brittle epoxy composite, a state-of-the-art toughened epoxy composite, and a tough thermoplastic composite over the full mixed-mode range. To gain insight into the different failure responses of the different materials, the delamination fracture surfaces were also examined. An evaluation of several failure criteria that have been reported in the literature was performed, and the range of responses modeled by each criterion was analyzed. A bilinear failure criterion was introduced based on a change in the failure mechanism observed from the delamination surfaces. The different criteria were compared to the failure response of the three materials tested. The responses of the two epoxies were best modeled with the new bilinear failure criterion. The failure response of the tough thermoplastic composite could be modeled well with the bilinear criterion but could also be modeled with the more simple linear failure criterion. Since the materials differed in their mixed-mode failure response, mixed-mode delamination testing will be needed to characterize a composite material. This paper presents consistent sets of mixed-mode data, provides a critical evaluation of the mixed-mode failure criteria, and should provide general guidance for selecting an appropriate criterion for other materials.

  18. On Dedekind's criterion and monogenicity over Dedekind rings

    Directory of Open Access Journals (Sweden)

    M. E. Charkani

    2003-01-01

    Full Text Available We give a practical criterion characterizing the monogenicity of the integral closure of a Dedekind ring R, based on results on the resultant Res (p,pi of the minimal polynomial p of a primitive integral element and of its irreducible factors pi modulo prime ideals of R. We obtain a generalization and an improvement of the Dedekind criterion (Cohen, 1996, and we give some applications in the case where R is a discrete valuation ring or the ring of integers of a number field, generalizing some well-known classical results.

  19. A sequential criterion analysis for assessing coping with chronic illness.

    Science.gov (United States)

    Turk, D C; Sobel, H J; Follick, M J; Youkilis, H D

    1980-01-01

    A three-stage sequential criterion analysis based on the Goldfried-D'Zurilla behavior model is presented as a heuristic approach for studying chronic illness. The three interrelated stages consist of: (a) problem identification, (b) response enumeration, and (c) response evaluation. The utility of this systematic approach for understanding the adaptive process, helping to identify patients who might benefit from intervention, providing content for actual intervention, and reducing the myth of homogeneity among chronic patient populations for both clinicians and researches, is discussed. Examples of the utility of the criterion analysis are provided throughout the paper.

  20. Criterion-Related Validity of the PDD Behavior Inventory.

    Science.gov (United States)

    Cohen, Ira L.

    2003-01-01

    This study assessed the criterion-related validity of the PDD Behavior Inventory, a rating scale to evaluate the adaptive and maladaptive behaviors of children with pervasive developmental disorders. Good correlations with five other scales confirmed the scale's validity and suggest its value in assessing treatment-related changes in maladaptive…

  1. Slope stability analysis using limit equilibrium method in nonlinear criterion.

    Science.gov (United States)

    Lin, Hang; Zhong, Wenwen; Xiong, Wei; Tang, Wenyu

    2014-01-01

    In slope stability analysis, the limit equilibrium method is usually used to calculate the safety factor of slope based on Mohr-Coulomb criterion. However, Mohr-Coulomb criterion is restricted to the description of rock mass. To overcome its shortcomings, this paper combined Hoek-Brown criterion and limit equilibrium method and proposed an equation for calculating the safety factor of slope with limit equilibrium method in Hoek-Brown criterion through equivalent cohesive strength and the friction angle. Moreover, this paper investigates the impact of Hoek-Brown parameters on the safety factor of slope, which reveals that there is linear relation between equivalent cohesive strength and weakening factor D. However, there are nonlinear relations between equivalent cohesive strength and Geological Strength Index (GSI), the uniaxial compressive strength of intact rock σ ci , and the parameter of intact rock m i . There is nonlinear relation between the friction angle and all Hoek-Brown parameters. With the increase of D, the safety factor of slope F decreases linearly; with the increase of GSI, F increases nonlinearly; when σ ci is relatively small, the relation between F and σ ci is nonlinear, but when σ ci is relatively large, the relation is linear; with the increase of m i , F decreases first and then increases.

  2. Satisfying the Einstein-Podolsky-Rosen criterion with massive particles

    DEFF Research Database (Denmark)

    Peise, Jan; Kruse, I.; Lange, K.

    2016-01-01

    In 1935, Einstein, Podolsky and Rosen (EPR) questioned the completeness of quantum mechanics by devising a quantum state of two massive particles with maximally correlated space and momentum coordinates. The EPR criterion qualifies such continuous-variable entangled states, as shown successfully...

  3. Phosphatase activity as a criterion for differentiation of oral mycoplasmas.

    OpenAIRE

    Shibata, K.; Totsuka, M; Watanabe, T.

    1986-01-01

    Phosphatase activity was found to be applicable as a criterion for the differentiation of Mycoplasma salivarium and Mycoplasma orale, predominant constituents of oral mycoplasmal flora. Therefore, a simple procedure for the phosphatase activity assay was established as a screening test for the differentiation of oral mycoplasmas.

  4. The Bohm criterion for a dusty plasma sheath

    Indian Academy of Sciences (India)

    The formation of the sheath in a dusty plasma is investigated. The Bohm criterion is derived for two different cases: (a) when electrons are in thermodynamic equilibrium and dust grains provide the immobile, stationary background and (b) when both electrons and ions are in thermodynamic equilibrium and dust grains are ...

  5. The Bohm criterion for a dusty plasma sheath

    Indian Academy of Sciences (India)

    Abstract. The formation of the sheath in a dusty plasma is investigated. The Bohm criterion is derived for two different cases: (a) when electrons are in thermodynamic equilibrium and dust grains provide the immobile, stationary background and (b) when both electrons and ions are in thermodynamic equilibrium and dust ...

  6. Criterion-based laparoscopic training reduces total training time

    NARCIS (Netherlands)

    Brinkman, W.M.; Buzink, S.N.; Alevizos, L.; De Hingh, I.H.J.T.; Jakimowicz, J.J.

    The benefits of criterion-based laparoscopic training over time-oriented training are unclear. The purpose of this study is to compare these types of training based on training outcome and time efficiency. Methods During four training sessions within 1 week (one session per day) 34 medical interns

  7. Application of Weibull Criterion to failure prediction in compsites

    Energy Technology Data Exchange (ETDEWEB)

    Cain, W. D.; Knight, Jr., C. E.

    1981-04-20

    Fiber-reinforced composite materials are being widely used in engineered structures. This report examines how the general form of the Weibull Criterion, including the evaluation of the parameters and the scaling of the parameter values, can be used for the prediction of component failure.

  8. Development of a Work Sample Criterion for General Vehicle Mechanic.

    Science.gov (United States)

    Engel, John D.

    A work sample criterion test was developed for General Vehicle Repairman, MOS 63C30 and 63C40. Test items covered three task categories: troubleshooting, corrective action, and preventive maintenance. Thirty-eight organizational mechanics were tested at Fort Knox, Kentucky. Data were also collected on the quality of performance, for example, use…

  9. Child Care Services Guide. Performance Objectives. Criterion Measures. Home Economics.

    Science.gov (United States)

    Duval County School Board, Jacksonville, FL.

    Several intermediate performance objectives and corresponding criterion measures are listed for each of 14 terminal objectives for a high school child care services course. This course is designed to provide opportunities for exploring a broad range of child care, guidance, and service occupations. Major concepts include characteristics of…

  10. Relationships of National Teacher Examination Communication Skills and General Knowledge Scores with High School and College Grades, Myers-Briggs Type Indicator Characteristics, and Self-Reported Skill Ratings and Academic Problems.

    Science.gov (United States)

    Schurr, K. Terry; And Others

    1989-01-01

    Relationships among National Teacher Examinations (NTE) Communication Skills and General Knowledge test scores, Myers-Briggs Type Indicator characteristics, self-reported academic problems, and 14 skill self-ratings were examined for 161 college teaching majors. After several other variables were controlled, personality variables accounted for a…

  11. An amplitude suppression method based on the decibel criterion

    Science.gov (United States)

    Kong, Xuan-Lin; Chen, Hui; Wang, Jin-Long; Hu, Zhi-quan; Xu, Dan; Li, Lu-Ming

    2017-09-01

    To suppress the strong noise in seismic data with wide range of amplitudes, commonly used methods often yield unsatisfactory denoising results owing to inappropriate thresholds and require parametric testing as well as iterations to achieve the anticipated results. To overcome these problems, a data-driven strong amplitude suppression method based on the decibel criterion in the wavelet domain (ISANA) is proposed. The method determines the denoising threshold based on the decibel criterion and statistically analyzes the amplitude index rather than the abnormally high amplitudes. The method distinguishes the frequency band distributions of the valid signals in the time-frequency domain based on the wavelet transformation and then calculates thresholds in selected time windows, eventually achieving frequency-divided noise attenuation for better denoising. Simulations based on theoretical and real-world data verify the adaptability and low dependence of the method on the size of the time window. The method suppresses noise without energy loss in the signals.

  12. Logical and Decisive Combining Criterion for Binary Group Decision Making

    Directory of Open Access Journals (Sweden)

    Ivan Vrana

    2010-04-01

    Full Text Available A new combining criterion, the Multiplicative Proportional Deviative Influence (MPDI is presented for combining or aggregating multi-expert numerical judgments in Yes-or-No type ill-structured group decision making situations. This newly proposed criterion performs well in comparison with the widely used aggregation means: the Arithmetic Mean (AM, and Geometric Mean (GM, especially in better reflecting the degree of agreement between criteria levels or numerical experts’ judgments. The MPDI can be considered as another class of combining criteria that make effect of the degree of agreement among multiple numerical judgments. The MPDI is applicable in integrating several collaborative or synergistic decision making systems through combining final numerical decision outputs. A discussion and generalization of the proposed MPDI is discussed withnumerical example.

  13. Critical role of electron heat flux on Bohm criterion

    Science.gov (United States)

    Tang, Xian-Zhu; Guo, Zehua

    2016-12-01

    Bohm criterion, originally derived for an isothermal-electron and cold-ion plasma, is often used as a rule of thumb for more general plasmas. Here, we establish a more precise determination of the Bohm criterion that are quantitatively useful for understanding and modeling collisional plasmas that still have collisional mean-free-path much greater than plasma Debye length. Specifically, it is shown that electron heat flux, rather than the isothermal electron assumption, is what sets the Bohm speed to be √{ k B ( T e ∥ + 3 T i ∥ ) / m i } with T e , i ∥ the electron and ion parallel temperature at the sheath entrance and mi the ion mass.

  14. A simple criterion on degree sequences of graphs

    National Research Council Canada - National Science Library

    Tripathi, Amitabha; Tyagi, Himanshu

    2008-01-01

    ... sequences are due to Havel  [7] , and independently, Hakimi  [5] , and jointly due to Erdős and Gallai  [4] . The result of Havel–Hakimi has been extended by Kleitman and Wang  [9] , and that of Erdős and Gallai by Eggleton  [3] , and by Tripathi and Vijay [11] . We give a simple criterion to characterize graphic sequences. Our characterization reli...

  15. Fatigue criterion to system design, life and reliability

    Science.gov (United States)

    Zaretsky, E. V.

    1985-01-01

    A generalized methodology to structural life prediction, design, and reliability based upon a fatigue criterion is advanced. The life prediction methodology is based in part on work of W. Weibull and G. Lundberg and A. Palmgren. The approach incorporates the computed life of elemental stress volumes of a complex machine element to predict system life. The results of coupon fatigue testing can be incorporated into the analysis allowing for life prediction and component or structural renewal rates with reasonable statistical certainty.

  16. Convergent, discriminant, and criterion validity of DSM-5 traits.

    Science.gov (United States)

    Yalch, Matthew M; Hopwood, Christopher J

    2016-10-01

    Section III of the Diagnostic and Statistical Manual of Mental Disorders (5th edi.; DSM-5; American Psychiatric Association, 2013) contains a system for diagnosing personality disorder based in part on assessing 25 maladaptive traits. Initial research suggests that this aspect of the system improves the validity and clinical utility of the Section II Model. The Computer Adaptive Test of Personality Disorder (CAT-PD; Simms et al., 2011) contains many similar traits as the DSM-5, as well as several additional traits seemingly not covered in the DSM-5. In this study we evaluate the convergent and discriminant validity between the DSM-5 traits, as assessed by the Personality Inventory for DSM-5 (PID-5; Krueger et al., 2012), and CAT-PD in an undergraduate sample, and test whether traits included in the CAT-PD but not the DSM-5 provide incremental validity in association with clinically relevant criterion variables. Results supported the convergent and discriminant validity of the PID-5 and CAT-PD scales in their assessment of 23 out of 25 DSM-5 traits. DSM-5 traits were consistently associated with 11 criterion variables, despite our having intentionally selected clinically relevant criterion constructs not directly assessed by DSM-5 traits. However, the additional CAT-PD traits provided incremental information above and beyond the DSM-5 traits for all criterion variables examined. These findings support the validity of pathological trait models in general and the DSM-5 and CAT-PD models in particular, while also suggesting that the CAT-PD may include additional traits for consideration in future iterations of the DSM-5 system. (PsycINFO Database Record (c) 2016 APA, all rights reserved).

  17. Orthotropic ductile fracture criterion based on linear transformation

    Science.gov (United States)

    Yoon, J. W.; Zhang, S.; Stoughton, T. B.

    2017-09-01

    Accurate modelling of orthotropic ductile fracture is key to carry out reliable numerical prediction of rupture in plastic deformation of lightweight metals, such as ultra high strength steel, aluminum alloys, titanium alloys and magnesium alloys. Experiments are conducted for an aluminum alloy in shear, uniaxial tension, plane strain tension along the rolling direction, the diagonal direction and the transverse direction. Loading processes are recorded and fracture strain is measured by analysis of deformation with digital image correlation. First, isotropic fracture behavior is modeled by both linear model (Maximum Shear Stress (MSS) plus mean stress) and nonlinear model (Hosford yield function plus mean stress) considering different triaxiality conditions. It is observed that the mean stress model shows significant difference in the compression area compared to Mohr Coulomb-based normal stress model and a new isotropic model with the mean stress term shows a good correlation for AA 6k21. This approach is extended to an anisotropic ductile fracture criterion based on linear transformation. The anisotropic ductile fracture criterion is applied to model orthotropic fracture strain in shear, uniaxial tension and plane strain tension. The predicted anisotropy in ductile fracture is compared with experimental results for the verification of its accuracy. The comparison indicates that the proposed anisotropic ductile fracture criterion accurately models orthotropic ductile fracture in various loading conditions in shear, uniaxial tension and plane strain tension.

  18. Criterion validation of a stress measure: the Stress Overload Scale.

    Science.gov (United States)

    Amirkhan, James H; Urizar, Guido G; Clark, Sarah

    2015-09-01

    Validating stress scales poses problems beyond those of other psychological measures. Here, 3 studies were conducted to address those problems and assess the criterion validity of scores from a new theory-derived measure, the Stress Overload Scale (SOS; Amirkhan, 2012). In Study 1, the SOS was tested for its ability to predict postsemester illness in a sample of college students (n = 127). Even with precautions to minimize criterion contamination, scores were found to predict health problems in the month following a final exam on all of 5 different criteria. In Study 2, a community sample (n = 231) was used to test the SOS' ability to differentiate people in stressful circumstances from those in more relaxed contexts. SOS scores demonstrated excellent sensitivity (96%) and specificity (100%) in this general population application. In Study 3, the SOS was tested for its ability to differentiate salivary cortisol responses to a laboratory stressor in a group of pregnant women (n = 40). High scores were found to be associated with a blunted cortisol response, which is indicative of HPA-axis overload and typical of persons suffering chronic stress and stress-related pathology. Across all 3 studies, despite variations in the stressor, criterion, population, and methods, SOS scores emerged as valid indicators of stress. However, each study also introduced new problems that beg additional corrective steps in future stress-scale validity tests. These strategies, and the SOS' utility as a research and diagnostic tool in varied applications and populations, are discussed. (c) 2015 APA, all rights reserved.

  19. Critical machine cluster identification using the equal area criterion

    DEFF Research Database (Denmark)

    Weckesser, Johannes Tilman Gabriel; Jóhannsson, Hjörtur; Østergaard, Jacob

    2015-01-01

    The paper introduces a new method to early identify the critical machine cluster (CMC) after a transient disturbance. For transient stability assessment with methods based on the equal area criterion it is necessary to split the generators into a group of critical and non-critical machines...... coupling coefficient is derived and a cluster identification algorithm is developed. The algorithm determines the CMC based on the impact of the fault on the derived coupling coefficient of individual generator pairs. The results from two cases are presented and discussed, where the CMC is successfully...

  20. Width Criterion For Weld-Seam-Tracking Data

    Science.gov (United States)

    Lincir, Mark R.

    1993-01-01

    Image-processing algorithm in "through-torch-vision" (T3V) system developed to guide gas/tungsten arc welding robot along weld seam modified, according to proposal, reducing incidence of inaccurate tracking of weld seam. Developmental system intended to provide closed-loop control of motion of welding robot along weld seam on basis of lines in T3V image identified by use of image-processing algorithm and assumed to coincide with edges of weld seam. Use of width criterion prevents tracking of many false pairs of lines, with consequent decrease in incidence of inaccurate tracking and increase in confidence in weld-tracking capability of robotic welding system.

  1. Forecastability as a Design Criterion in Wind Resource Assessment: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, J.; Hodge, B. M.

    2014-04-01

    This paper proposes a methodology to include the wind power forecasting ability, or 'forecastability,' of a site as a design criterion in wind resource assessment and wind power plant design stages. The Unrestricted Wind Farm Layout Optimization (UWFLO) methodology is adopted to maximize the capacity factor of a wind power plant. The 1-hour-ahead persistence wind power forecasting method is used to characterize the forecastability of a potential wind power plant, thereby partially quantifying the integration cost. A trade-off between the maximum capacity factor and the forecastability is investigated.

  2. Corner-point criterion for assessing nonlinear image processing imagers

    Science.gov (United States)

    Landeau, Stéphane; Pigois, Laurent; Foing, Jean-Paul; Deshors, Gilles; Swiathy, Greggory

    2017-10-01

    Range performance modeling of optronics imagers attempts to characterize the ability to resolve details in the image. Today, digital image processing is systematically used in conjunction with the optoelectronic system to correct its defects or to exploit tiny detection signals to increase performance. In order to characterize these processing having adaptive and non-linear properties, it becomes necessary to stimulate the imagers with test patterns whose properties are similar to the actual scene image ones, in terms of dynamic range, contours, texture and singular points. This paper presents an approach based on a Corner-Point (CP) resolution criterion, derived from the Probability of Correct Resolution (PCR) of binary fractal patterns. The fundamental principle lies in the respectful perception of the CP direction of one pixel minority value among the majority value of a 2×2 pixels block. The evaluation procedure considers the actual image as its multi-resolution CP transformation, taking the role of Ground Truth (GT). After a spatial registration between the degraded image and the original one, the degradation is statistically measured by comparing the GT with the degraded image CP transformation, in terms of localized PCR at the region of interest. The paper defines this CP criterion and presents the developed evaluation techniques, such as the measurement of the number of CP resolved on the target, the transformation CP and its inverse transform that make it possible to reconstruct an image of the perceived CPs. Then, this criterion is compared with the standard Johnson criterion, in the case of a linear blur and noise degradation. The evaluation of an imaging system integrating an image display and a visual perception is considered, by proposing an analysis scheme combining two methods: a CP measurement for the highly non-linear part (imaging) with real signature test target and conventional methods for the more linear part (displaying). The application to

  3. An improved criterion for Kapitza's pendulum stability

    Energy Technology Data Exchange (ETDEWEB)

    Butikov, Eugene i, E-mail: eugene.butikov@gmail.com [St. Petersburg State University, St. Petersburg (Russian Federation)

    2011-07-22

    An enhanced and more exact criterion for dynamic stabilization of the parametrically driven inverted pendulum is obtained: the boundaries of stability are determined with greater precision and are valid in a wider region of the system parameters than previous results. The lower boundary of stability is associated with the phenomenon of subharmonic resonances in this system. The relationship of the upper limit of dynamic stabilization of the inverted pendulum with ordinary parametric resonance (i.e. with destabilization of the lower equilibrium position) is established. Computer simulation of the physical system aids the analytical investigation and proves the theoretical results.

  4. Utilization of Durability Criterion to Develop Automotive Components

    DEFF Research Database (Denmark)

    Ricardo, Luiz Carlos Hernandes

    2010-01-01

    Today the automotive companies must reduce the time to development of new products with improvement in performance, durability and low cost reductions where possible. To achieve this goal the carmakers need to improve the design criterion of car systems like body, chassis and suspension components....... This paper will present a review of the techniques used in the automotive industry regarding durability before mentioned systems. The paper will present the procedures to obtain the spectrum loading to use in finite element analysis and the validation in laboratory and proving grounds....

  5. The alternative DSM-5 personality disorder traits criterion

    DEFF Research Database (Denmark)

    Bach, Bo; Maples-Keller, Jessica L; Bo, Sune

    2016-01-01

    The fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5; American Psychiatric Association, 2013a) offers an alternative model for Personality Disorders (PDs) in Section III, which consists in part of a pathological personality traits criterion measured...... with the Personality Inventory for DSM-5 (PID-5). The PID-5 selfreport instrument currently exists in the original 220-item form, a short 100-item form, and a brief 25-item form. For clinicians and researchers, the choice of a particular PID- 5 form depends on feasibility, but also reliability and validity. The goal...

  6. Application of an enhanced Coordinate Modal Assurance Criterion

    Science.gov (United States)

    Hunt, David L.

    1992-01-01

    This paper presents an extension of the Coordinate Modal Assurance Criterion (COMAC) for spatial comparison of mode shapes. As is the case for the original COMAC, this enhanced COMAC helps identify degrees of freedom differences between test and analysis modes, but also overcomes some of the limitations of the original COMAC. The original COMAC cannot identify errors caused by scaling or polarity mistakes in the test data. Such mistakes are easily made during modal tests and not always easily detected since they do not affect the subjective quality of a frequency response function.

  7. Sensor Calibration Design Based on D-Optimality Criterion

    Directory of Open Access Journals (Sweden)

    Hajiyev Chingiz

    2016-09-01

    Full Text Available In this study, a procedure for optimal selection of measurement points using the D-optimality criterion to find the best calibration curves of measurement sensors is proposed. The coefficients of calibration curve are evaluated by applying the classical Least Squares Method (LSM. As an example, the problem of optimal selection for standard pressure setters when calibrating a differential pressure sensor is solved. The values obtained from the D-optimum measurement points for calibration of the differential pressure sensor are compared with those from actual experiments. Comparison of the calibration errors corresponding to the D-optimal, A-optimal and Equidistant calibration curves is done.

  8. Slope Safety Factor Calculations With Non-Linear Yield Criterion Using Finite Elements

    DEFF Research Database (Denmark)

    Clausen, Johan; Damkilde, Lars

    2006-01-01

    The factor of safety for a slope is calculated with the finite element method using a non-linear yield criterion of the Hoek-Brown type. The parameters of the Hoek-Brown criterion are found from triaxial test data. Parameters of the linear Mohr-Coulomb criterion are calibrated to the same triaxial...

  9. Minimum shear stress range: a criterion for crack path determination

    Science.gov (United States)

    Pereira, K.; Abdel Wahab, M.

    2017-05-01

    For problems under proportional mixed-mode conditions, various criteria are used to predict fatigue crack growth directions, most achieving reasonable accuracy. The crack propagation angle is often obtained by maximizing a quantity (for instance, energy or stresses) as function of the stress intensity factors KI and KII. This maximization is generally performed at the instant of maximum fatigue loading and a stress analysis at this instant is sufficient to predict the crack propagation angle and thus the fatigue crack growth direction. However, under non-proportional loading, the maximum values of KI and KII may occur at different instants of the fatigue cycle and so a simple analysis at the maximum loading instant is not appropriate; it is necessary to consider the entire loading cycle history. One possible criterion to treat problems under these circumstances is the minimum shear stress range criterion (MSSR). This paper presents a brief discussion of the most common criteria used for determination of crack propagation direction, focusing on an implementation of MSSR. Its performance is assessed in different conditions and the results are compared to literature data.

  10. Environmental equity as a criterion for water management

    Science.gov (United States)

    Grande, M.; Galvão, C.; Miranda, L.; Rufino, I.

    2014-09-01

    Environmental equity is a concept derived from the (un)equal exposure to environmental degradation by different social groups, usually minorities and low-income people exposed to major environmental risks, also known as environmental justice. It is assumed that no group of people, independent of race, ethnicity or socio-economic class, should support, either in concentrated or unevenly distributed form, the negative environmental impacts resulting from industrial, agricultural, commercial and infrastructure activities or government programs and policies. In this paper the concept of environmental equity is explored as a criterion for water management through the analysis of a typical coupled human-natural system: the Epitácio Pessoa Reservoir, located in the semi-arid region of Brazil. Inefficient water resource management has caused unequal access to water by the population, particularly during drought periods. However, census data indicate that population have practically the same access to water, which actually is not able to reflect the actual picture. This study argues that environmental equity can be an additional criterion to improve water management.

  11. A criterion to maximize the irreversible efficiency in heat engines

    CERN Document Server

    Aragon-Gonzalez, G; Leon-Galicia, A; Musharrafie-Martinez, M

    2003-01-01

    The purpose of this work is to obtain a more precise calculation of the effective limits to the efficiency, of several cyclic heat engines. This calculation is based, first, on the equations describing the irreversible efficiency, and second, on a method which results from a general criterion to maximize this efficiency, applicable to several heat engines. With this method, we apply the criterion to maximize efficiencies; establish lower and upper bounds, corresponding to the efficiencies of Curzon-Ahlborn-like and Carnot-like heat engines; and, finally, find analytical or numerical expressions for the efficiencies eta sub m sub e and eta sub m sub a sub x. eta sub m sub a sub x is the maximum irreversible efficiency; eta sub m sub e is the efficiency in which the irreversible efficiency achieves its maximum, in a similar way to the Curzon-Ahlborn efficiency (maximum work or power). The method was applied to a Brayton cycle, presenting internal dissipations of the working fluid and irreversibilities due to th...

  12. ACTION AS A CRITERION OF THE CAR OPERATING EFFECTIVENES

    Directory of Open Access Journals (Sweden)

    Stefan POSTRZEDNIK

    2016-06-01

    Full Text Available Currently used criteria for determining car operating efficiency in road traffic are, among others, emission of harmful substances, consumption of engine driving fuels, technical service and reliability of operation, safety of use. The operational characteristics of the car in terms of engine driving fuel consumption data is usually recognised as so-called road specific fuel consumption. An important deficiency of this approach is the failure to take into account the influence of the time on the journey’s effectiveness and the final result of the entire project. To obtain a new solution in this range in the analysis, a quantity called "action", which at last will be treated as the criterion of the car operating effectiveness, was used. The quantity of action is the product of the performed work and its realisation time. Many phenomena and processes in nature take place according to the principle of "minimum of action"  this criterion can be applied in the analysis of the car’s operating efficiency taking place in road traffic. An approach of this issue is presented in this article, wherein the basic data for analysis were obtained in the framework of the car tests performed at the real traffic conditions.

  13. Os tipos psicológicos na psicologia analítica de Carl Gustav Jung e o inventário de personalidade “Myers-Briggs Type Indicator (MBTI”: contribuições para a psicologia educacional, organizacional e clínica/The psychological types in analytical psychology of Carl Gustav Jung and the inventory of personality “Myers-Briggs Type Indicator (MBTI”: contributions for the educational, organizational and clinical psychology

    Directory of Open Access Journals (Sweden)

    Luís Marcelo Alves Ramos

    2005-01-01

    Full Text Available O texto apresenta os princípios da Teoria dos Tipos Psicológicos, a mais conhecida face da Psicologia Analítica do psicólogo e psiquiatra suíço Carl Gustav Jung (1875-1961, bem como os fundamentos do Inventário de Personalidade “Myers-Briggs Type Indicator (MBTI”, constituído a partir da tipologia junguiana, e que vem sendo cada vez mais utilizado nos campos da Psicologia Educacional, Organizacional e Clínica. The text presents the principles of the Theory of Psychological Types, the most known face of the Analytical Psychology of the Swiss psychologist and psychiatrist Carl Gustav Jung (1875-1961, as well as the fundamentals of the Inventory of Personality “Myers-Briggs Type Indicator (MBTI”, constituted from the Jungian typology, and which has been more used nowadays by Educational, Organizational and Clinical Psychology.

  14. Model Selection and Psychological Theory: A Discussion of the Differences between the Akaike Information Criterion (AIC) and the Bayesian Information Criterion (BIC)

    Science.gov (United States)

    Vrieze, Scott I.

    2012-01-01

    This article reviews the Akaike information criterion (AIC) and the Bayesian information criterion (BIC) in model selection and the appraisal of psychological theory. The focus is on latent variable models, given their growing use in theory testing and construction. Theoretical statistical results in regression are discussed, and more important…

  15. Criterion Related Validity of Karate Specific Aerobic Test (KSAT).

    Science.gov (United States)

    Chaabene, Helmi; Hachana, Younes; Franchini, Emerson; Tabben, Montassar; Mkaouer, Bessem; Negra, Yassine; Hammami, Mehrez; Chamari, Karim

    2015-09-01

    Karate is one the most popular combat sports in the world. Physical fitness assessment on a regular manner is important for monitoring the effectiveness of the training program and the readiness of karatekas to compete. The aim of this research was to examine the criterion related to validity of the karate specific aerobic test (KSAT) as an indicator of aerobic level of karate practitioners. Cardiorespiratory responses, aerobic performance level through both treadmill laboratory test and YoYo intermittent recovery test level 1 (YoYoIRTL1) as well as time to exhaustion in the KSAT test (TE'KSAT) were determined in a total of fifteen healthy international karatekas (i.e. karate practitioners) (means ± SD: age: 22.2 ± 4.3 years; height: 176.4 ± 7.5 cm; body mass: 70.3 ± 9.7 kg and body fat: 13.2 ± 6%). Peak heart rate obtained from KSAT represented ~99% of maximal heart rate registered during the treadmill test showing that KSAT imposes high physiological demands. There was no significant correlation between KSAT's TE and relative (mL/min kg) treadmill maximal oxygen uptake (r = 0.14; P = 0.69; [small]). On the other hand, there was a significant relationship between KSAT's TE and the velocity associated with VO2max (vVO2max) (r = 0.67; P = 0.03; [large]) as well as the velocity at VO2 corresponding to the second ventilatory threshold (vVO2 VAT) (r = 0.64; P = 0.04; [large]). Moreover, significant relationship was found between TE's KSAT and both the total distance covered and parameters of intermittent endurance measured through YoYoIRTL1. The KSAT has not proved to have indirect criterion related validity as no significant correlations have been found between TE's KSAT and treadmill VO2max. Nevertheless, as correlated to other aerobic fitness variables, KSAT can be considered as an indicator of karate specific endurance. The establishment of the criterion related validity of the KSAT requires further investigation.

  16. Criterion Related Validity of Karate Specific Aerobic Test (KSAT)

    Science.gov (United States)

    Chaabene, Helmi; Hachana, Younes; Franchini, Emerson; Tabben, Montassar; Mkaouer, Bessem; Negra, Yassine; Hammami, Mehrez; Chamari, Karim

    2015-01-01

    Background: Karate is one the most popular combat sports in the world. Physical fitness assessment on a regular manner is important for monitoring the effectiveness of the training program and the readiness of karatekas to compete. Objectives: The aim of this research was to examine the criterion related to validity of the karate specific aerobic test (KSAT) as an indicator of aerobic level of karate practitioners. Patients and Methods: Cardiorespiratory responses, aerobic performance level through both treadmill laboratory test and YoYo intermittent recovery test level 1 (YoYoIRTL1) as well as time to exhaustion in the KSAT test (TE’KSAT) were determined in a total of fifteen healthy international karatekas (i.e. karate practitioners) (means ± SD: age: 22.2 ± 4.3 years; height: 176.4 ± 7.5 cm; body mass: 70.3 ± 9.7 kg and body fat: 13.2 ± 6%). Results: Peak heart rate obtained from KSAT represented ~99% of maximal heart rate registered during the treadmill test showing that KSAT imposes high physiological demands. There was no significant correlation between KSAT’s TE and relative (mL/min kg) treadmill maximal oxygen uptake (r = 0.14; P = 0.69; [small]). On the other hand, there was a significant relationship between KSAT’s TE and the velocity associated with VO2max (vVO2max) (r = 0.67; P = 0.03; [large]) as well as the velocity at VO2 corresponding to the second ventilatory threshold (vVO2 VAT) (r = 0.64; P = 0.04; [large]). Moreover, significant relationship was found between TE’s KSAT and both the total distance covered and parameters of intermittent endurance measured through YoYoIRTL1. Conclusions: The KSAT has not proved to have indirect criterion related validity as no significant correlations have been found between TE’s KSAT and treadmill VO2max. Nevertheless, as correlated to other aerobic fitness variables, KSAT can be considered as an indicator of karate specific endurance. The establishment of the criterion related validity of the KSAT

  17. The double high tide at Port Ellen: Doodson's criterion revisited

    Directory of Open Access Journals (Sweden)

    H. A. M. Byrne

    2017-07-01

    Full Text Available Doodson proposed a minimum criterion to predict the occurrence of double high (or double low waters when a higher-frequency tidal harmonic is added to the semi-diurnal tide. If the phasing of the harmonic is optimal, the condition for a double high water can be written bn2∕a > 1 where b is the amplitude of the higher harmonic, a is the amplitude of the semi-diurnal tide, and n is the ratio of their frequencies. Here we expand this criterion to allow for (i a phase difference ϕ between the semi-diurnal tide and the harmonic and (ii the fact that the double high water will disappear in the event that b∕a becomes large enough for the higher harmonic to be the dominant component of the tide. This can happen, for example, at places or times where the semi-diurnal tide is very small. The revised parameter is br2∕a, where r is a number generally less than n, although equal to n when ϕ = 0. The theory predicts that a double high tide will form when this parameter exceeds 1 and then disappear when it exceeds a value of order n2 and the higher harmonic becomes dominant. We test these predictions against observations at Port Ellen in the Inner Hebrides of Scotland. For most of the data set, the largest harmonic of the semi-diurnal tide is the sixth diurnal component, for which n = 3. The principal lunar and solar semi-diurnal tides are about equal at Port Ellen and so the semi-diurnal tide becomes very small twice a month at neap tides (here defined as the smallest fortnightly tidal range. A double high water forms when br2∕a first exceeds a minimum value of about 1.5 as neap tides are approached and then disappears as br2∕a then exceeds a second limiting value of about 10 at neap tides in agreement with the revised criterion.

  18. Antenatal Maternal Hypoxia: Criterion for Fetal Growth Restriction in Rodents

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    Amy E Jang

    2015-06-01

    Full Text Available Rodents are a useful model for life science research. Accumulating evidence suggests that the offspring of mice and rats suffer from similar disorders as humans when exposed to hypoxia during pregnancy. Importantly, with antenatal hypoxic exposure, human neonates demonstrate low birth weight or growth restriction. Similarly, with antenatal hypoxic exposure rodents also demonstrate the fetal growth restriction (FGR. Surprisingly, there is no consensus on the minimum duration or degree of hypoxic exposure required to cause FGR in rodents. Thus, we have reviewed the available literature in an attempt to answer these questions. Based on studies in rats, birth weight reduction of 31% corresponded to 10th percentile reduction in birth weight curve. With the similar criterion (10th percentile, in mice 3 days or more and in rats 7 days or more of 14% or lower hypoxia administration was required to produce statistically significant FGR.

  19. Error sensitivity to refinement: a criterion for optimal grid adaptation

    Science.gov (United States)

    Luchini, Paolo; Giannetti, Flavio; Citro, Vincenzo

    2017-12-01

    Most indicators used for automatic grid refinement are suboptimal, in the sense that they do not really minimize the global solution error. This paper concerns with a new indicator, related to the sensitivity map of global stability problems, suitable for an optimal grid refinement that minimizes the global solution error. The new criterion is derived from the properties of the adjoint operator and provides a map of the sensitivity of the global error (or its estimate) to a local mesh refinement. Examples are presented for both a scalar partial differential equation and for the system of Navier-Stokes equations. In the last case, we also present a grid-adaptation algorithm based on the new estimator and on the FreeFem++ software that improves the accuracy of the solution of almost two order of magnitude by redistributing the nodes of the initial computational mesh.

  20. Memetic Differential Evolution with an Improved Contraction Criterion

    Directory of Open Access Journals (Sweden)

    Lei Peng

    2017-01-01

    Full Text Available Memetic algorithms with an appropriate trade-off between the exploration and exploitation can obtain very good results in continuous optimization. In this paper, we present an improved memetic differential evolution algorithm for solving global optimization problems. The proposed approach, called memetic DE (MDE, hybridizes differential evolution (DE with a local search (LS operator and periodic reinitialization to balance the exploration and exploitation. A new contraction criterion, which is based on the improved maximum distance in objective space, is proposed to decide when the local search starts. The proposed algorithm is compared with six well-known evolutionary algorithms on twenty-one benchmark functions, and the experimental results are analyzed with two kinds of nonparametric statistical tests. Moreover, sensitivity analyses for parameters in MDE are also made. Experimental results have demonstrated the competitive performance of the proposed method with respect to the six compared algorithms.

  1. Criterion and Incremental Validity of the Emotion Regulation Questionnaire

    Directory of Open Access Journals (Sweden)

    Christos A. Ioannidis

    2015-03-01

    Full Text Available Although research on emotion regulation (ER is developing, little attention has been paid to the predictive power of ER strategies beyond established constructs. The present study examined the incremental validity of the Emotion Regulation Questionnaire (ERQ; Gross & John, 2003, which measures cognitive reappraisal and expressive suppression, over and above the Big Five personality traits. It also extended the evidence for the measure’s criterion validity to yet unexamined criteria. A university student sample (N = 203 completed the ERQ, a measure of the Big Five, and relevant cognitive and emotion-laden criteria. Cognitive reappraisal predicted positive affect beyond personality, as well as experiential flexibility and constructive self-assertion beyond personality and affect. Expressive suppression explained incremental variance in negative affect beyond personality and in experiential flexibility beyond personality and general affect. No incremental effects were found for worry, social anxiety, rumination, reflection, and preventing negative emotions. Implications for the construct validity and utility of the ERQ are discussed.

  2. The first quantitative rating system of the antioxidant capacity of beauty creams via the Briggs-Rauscher reaction: a crucial step towards evidence-based cosmetics.

    Science.gov (United States)

    Cecchi, Teresa; Cecchi, Patrizio; Passamonti, Paolo

    2011-02-07

    Oxidative damage is the primary cause of skin aging. Skin care products are numerous and overwhelming, yet there is certain similarity among different formulations. Moisturizers are ubiquitous and the presence of particular added ingredients supports specific marketing claims. The antioxidant effects of botanical polyphenols possess tremendous marketing appeal, because oxidative stress is caused by an imbalance between the production of reactive oxygen species (ROS) and the skin ability to neutralize them. The concept of evidence-based cosmetics lacks a widely accepted method to estimate the antioxidant capacity of the beauty cream. This was the motive force of the present study: for the first time we put forth a quantitative rating system of skin care products. The overall antioxidant power of 75 widely used and advertised beauty creams was comparatively measured via the oscillating Briggs-Rauscher (BR) reaction. Many dermocosmetic products confirmed their ability to ensure protection against free radicals, even if differences among various creams are striking and often not correlated with the their price. The method we developed is simple and cheap and it can allow dermatologists and consumers to compare and choose effectively; on the other hand, producers can used this method to select the most active antioxidant cosmetic agent to optimise the product performance.

  3. Student Preferences and Performance in Online and Face-to-Face Classes Using Myers-Briggs Indicator: A Longitudinal Quasi-Experimental Study

    Directory of Open Access Journals (Sweden)

    Seta Boghikian-Whitby

    2016-05-01

    Full Text Available This longitudinal, quasi-experimental study investigated students’ cognitive personality type using the Myers-Briggs personality Type Indicator (MBTI in Internet-based Online and Face-to-Face (F2F modalities. A total of 1154 students enrolled in 28 Online and 32 F2F sections taught concurrently over a period of fourteen years. The study measured whether the sample is similar to the national average percentage frequency of all 16 different personality types; whether specific personality type students preferred a specific modality of instructions and if this preference changed over time; whether learning occurred in both class modalities; and whether specific personality type students learned more from a specific modality. Data was analyzed using regression, t-test, frequency, and Chi-Squared. The study concluded that data used in the study was similar to the national statistics; that no major differences in preference occurred over time; and that learning did occur in all modalities, with more statistically significant learning found in the Online modality versus F2F for Sensing, Thinking, and Perceiving types. Finally, Sensing and Thinking (ST and Sensing and Perceiving (SP group types learned significantly more in Online modality versus F2F.

  4. Assessment of personality type and medical specialty choice among medical students from Karachi; using Myers-Briggs Type Indicator (MBTI) tool.

    Science.gov (United States)

    Jafrani, Sana; Zehra, Nosheen; Zehra, Muneeza; Abuzar Ali, Syed Muhmmad; Abubakar Mohsin, Saiyed Abdullah; Azhar, Rasheed

    2017-04-01

    To assess personality type of medical students and associate it with their choice of medical specialty. This cross-sectional study was conducted in February 2014 at one public and one private medical university of Karachi, and comprised medical students. A self- administered questionnaire based on Myers-Briggs type indicator was used to collect data which was analysed using SPSS 20. Of the 400 participants, there were 200(50%) each from public and private universities. Of all, 201(50.3%) students were found to be extroverted and 199(49.8%) were introverted personality types. Clinical fields were the main preference of students after their medical degree as selected by 317(79.2%) students; of the, Extroverted-Sensing-Feeling-Perceptive was the most common type identified in39(7.2%) students. Extroverted-Sensing-Feeling-Perceptive 11(2.8%), Extroverted-Sensing-Thinking-Judging 12(3%), Extroverted-Sensing-Feeling-Judging 5(1.3%), Introverted-Sensing-Feeling-Judging 6(1.5%), Introverted-Sensing-Thinking-Perceptive 7(1.8%) had preference for surgery, medicine, gynaecology, paediatrics and cardiology, respectively. Personality had significant impact on specialty and career choice.

  5. [Relationships between Myers-Briggs Type Indicator (MBTI) psychological type and marital satisfaction, divorce proneness, positive affect, and conflict regulation in clinic couples].

    Science.gov (United States)

    Kong, Seong Sook

    2010-06-01

    The purpose of the study was to investigate the relationships between the Myers-Briggs Type Indicator (MBTI) psychological type and marital satisfaction, divorce proneness, positive affect, and conflict regulation in couple visiting a clinic. Couples (n=62) who visited "M" couple clinic participated in the study. Data were collected from March to June 2009 using the Marital Satisfaction Scale, Marital Status Inventory, Positive Affect Inventory, and Conflict Regulation Inventory. The couples showed no significant differences in marital satisfaction, positive affect, and conflict regulation according to similarities between spouses in MBTI types. However, they showed significant differences in divorce proneness of husband according to a similarity in the Sensing/Intuition indicator. They also showed significant differences in divorce proneness, positive affect, and conflict regulation between the couples for ISTJ (Introversion, Sensing, Thinking, Judging) or ESTJ (Extraversion, Sensing, Thinking, Judging) types compared to other couples. When nurses counsel couples, they should understand that differences in psychological type between spouses affects their marital relationship. In addition, nurses should educate couples on the characteristics of each type according to the couple's types and help them to understand each other, especially for couples where one spouse is the ISTJ/ESTJ type. These interventions will improve marital satisfaction and prevent the divorce in these couples.

  6. PRINCIPLE OF PROPORTIONALITY, CRITERION OF LEGITIMACY IN THE PUBLIC LAW

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    MARIUS ANDREESCU

    2011-04-01

    Full Text Available A problem of essence of the state is the one to delimit the discretionary power, respectively the power abuse in the activity of the state’s institutions. The legal behavior of the state’s institutions consists in their right to appreciate them and the power excess generates the violation of a subjective right or of the right that is of legitimate interest to the citizen. The application and nonobservance of the principle of lawfulness in the activities of the state is a complex problem because the exercise of the state’s functions assumes the discretionary powers with which the states authorities are invested, or otherwise said the ‘right of appreciation” of the authorities regarding the moment of adopting the contents of the measures proposed. The discretionary power cannot be opposed to the principle of lawfulness, as a dimension of the state de jure. In this study we propose to analyze the concept of discretionary power, respectively the power excess, having as a guidance the legislation, jurisprudence and doctrine in the matter. At the same time we would like to identify the most important criterions that will allow the user, regardless that he is or not an administrator, a public clerk or a judge, to delimit the legal behavior of the state’s institutions from the power excess. Within this context, we appreciate that the principle of proportionality represents such a criterion. The proportionality is a legal principle of the law, but at the same time it is a principle of the constitutional law and of other law branches. It expresses clearly the idea of balance, reasonability but also of adjusting the measures ordered by the state’s authorities to the situation in fact, respectively to the purpose for which they have been conceived. In our study we choose theoretical and jurisprudence arguments according to which the principle of proportionality can procedurally be determined and used to delimit the discretionary power and

  7. Decomposition Criterion-based Redundancy Removal in Mechanical Structures

    Directory of Open Access Journals (Sweden)

    A. N. Bozhko

    2014-01-01

    Full Text Available The most important design solutions of production engineering for the assembly operation are an assembly sequence and assembly chart. Both are closely linked with each other and therefore are recorded in the single process flow sheet that is an assembly chart.Capability for successive order assembling and splitting into assembly units depends on a set of the product design properties from which the main ones are position mechanical connections used to locate details within a product. An adequate mathematical model of the mechanical connections of technical system is a hyper graph. It allows us to give the correct description of the location relation of variable-locality.The analysis of the array of drawings shows that many designs contain redundant mechanical connections. The inequality is a criterion of redundancy, where |X| is the number of tops of the hyper graph (details, and |R| is the number of hyper edges (full assembly bases. Excess of mutual coordination is a harmful phenomenon which at designing stage exhibits as unsolvable dimension chains, while at the assembly stage it shows as relocation. Redundant connections should be removed from a design at the earliest design-for-manufacturing stages. Removal of connections generates mechanical structures with different assembly properties. The work offers some important criteria of generation of irredundant mechanical structures. The paper considers in detail a maximum decomposition criterion, which allows us to receive structures with the greatest capability to split into assembly units. It shows that such structures exhibit high flexibility in assembling and are adaptable to various specifications and production processes.

  8. Differences in posttraumatic stress disorder diagnostic rates and symptom severity between Criterion A1 and non-Criterion A1 stressors.

    Science.gov (United States)

    Long, Mary E; Elhai, Jon D; Schweinle, Amy; Gray, Matt J; Grubaugh, Anouk L; Frueh, B Christopher

    2008-10-01

    This study addresses the ongoing controversy regarding the definition of DSM-IV posttraumatic stress disorder's (PTSD) traumatic stressor criterion (A1). A sample of 119 college students completed the PTSD Symptom Scale separately in relation to both Criterion A1 and non-Criterion A1 stressful events, using a mixed between-groups (administration order) and within-subjects (stressor type) design. Contrary to what was expected, analyses revealed that non-Criterion A1 events were associated with greater likelihood of "probable" PTSD diagnoses and a greater PTSD symptom frequency than Criterion A1 events. Symptom frequency relationships, however, were moderated by the order in which the measures were administered. The non-Criterion A1 PTSD scores were only higher when non-Criterion A1 measures were presented first in the administration order. Similar patterns of differences in PTSD scores between stressor types were also found across the three PTSD symptom criteria. Implications are discussed as to the ongoing controversy of the PTSD construct.

  9. A new cladding embrittlement criterion derived from ring compression tests

    Energy Technology Data Exchange (ETDEWEB)

    Herb, Joachim, E-mail: Joachim.Herb@grs.de; Sievers, Jürgen, E-mail: Juergen.Sievers@grs.de; Sonnenburg, Heinz-Günther, E-mail: Heinz-Guenther.Sonnenburg@grs.de

    2014-07-01

    Highlights: • Using FEM it was possible to simulate measured ring compression test data. • The FEM provides burst stresses from Zry-4, M5 and ZIRLO cladding. • The ratio of burst stresses to yield stresses was correlated. • The ratio depends linearly on the state of oxidation and hydriding. • The ratio of stresses at unity can be applied as embrittlement criterion. - Abstract: It is of regulatory interest to prevent the breaking of fuel rods in LOCA transients. In current regulations this is accomplished by limiting the oxidation during LOCA to such an extent that still some residual ductility is preserved in the fuel rod cladding. The current oxidation limit in German as well as in US regulations is set to 17% ECR (Equivalent Cladding Reacted) which aims at maintaining a residual ductility for oxidized claddings. Recent ANL tests have shown that the combination of both oxidation and additionally hydrogen up-take affects the transition to zero-ductility. Furthermore, the oxidation during LOCA transient is accompanied by a significant up-take of hydrogen (secondary hydriding) if the fuel rod bursts during this transient. This secondary hydriding affects the cladding in the vicinity of the burst opening. These findings necessitate a new criterion for preserving cladding's strength. This paper describes a method how to derive a criterion which assures the required residual mechanical strength of the cladding for LOCA transients. This method utilizes the experimental results of 102 ring compression tests (RCT) conducted at ANL and KIT. RCTs of various cladding materials, oxidation levels and hydrogen content were considered. The basic approach was to compare the RCT test data with finite element analyses using the code ADINA. Starting with the cladding oxidation model of Leistikov, both the layer structure of the cladding and the distribution of the oxygen among these layers were determined. The mechanical properties of these layers were taken from

  10. Validation of a Criterion for Cam Mechanisms Optimization Using Constraints upon Cam’s Curvature

    Directory of Open Access Journals (Sweden)

    Stelian Alaci

    2016-06-01

    Full Text Available For the mechanism with rotating cam and knife-edge follower, an optimization criterion by means of imposed constraints upon cam’s curvature is expressed in a special coordinate system. Thus, stating the optimization criterion in the coordinate system defined by the mechanisms constructive parameters -eccentricity and minimum follower’s stroke, a contour is obtained for any position of the mechanism. The optimization criterion assumes establishing the position of the characteristic point of the mechanism with respect to this contour. Fulfillment of optimization criterion assumes that the characteristic point is positioned in the same manner with respect to all contours. The optimization criterion is simplified when considering the envelope of the contours. The method is exemplified using two mechanisms, with the cams priori satisfying the criterion.

  11. Improvement of the Barkhausen criterion and the implementation of an intelligent function generator

    Directory of Open Access Journals (Sweden)

    Chia-Wei Lin

    2017-03-01

    Full Text Available Function generators are vital tools for many industrial applications. Sinusoidal oscillators are the essential units of function generators and investigating their performance is therefore necessary. The Barkhausen criterion is widely applied in designing sinusoidal oscillators because of its simplicity. The authors exploit a crucial necessary and sufficient oscillation criterion for Wien Bridge and Colpitts oscillators based on Simple Chen's Electric Unifying Approach. Their approach resolves the shortcoming of the traditional Barkhausen criterion, namely that it entails only a necessary condition. They propose a simple oscillation determining criterion that uses a stable sine-wave oscillator with an adjustable oscillation frequency. The derived oscillation criterion establishes a precise condition for the existence of oscillatory behaviour and does not require the fixed value used in the traditional Barkhausen criterion. To demonstrate its applicability, the proposed approach for the Wien Bridge and Colpitts oscillators is applied to implement a function generator.

  12. A Heuristic Criterion for Instability to Fragmentation in Rotating, Interstellar Clouds

    Science.gov (United States)

    Boss, Alan Paul

    1982-01-01

    A heuristic criterion, based on linear perturbation analysis, is applied to the initial growth of density perturbations in isothermal or adiabatic gas clouds, with initially uniform density and uniform rotation. The heuristic criterion is shown to be consistent with the available results from numerical calculations of cloud collapse. The criterion predicts that perturbations varying as cos (m(phi)) will be most likely to grow when )pi is small, unless the cloud is nearly pressureless.

  13. A simple metal-insulator criterion for the doped Mott-Hubbard materials

    OpenAIRE

    Gavrichkov, V. A.

    2014-01-01

    We derived a simple metal-insulator criterion in analytical form for the doped Mott-Hubbard materials. Its readings closely related to the orbital and spin nature of the ground states of the unit cell. The available criterion readings (metal or insulator) in the paramagnetic phase points to the possibility of the insulator state of doped materials with the forbidden first removal electron states. According to its physical meaning the result is similar to Wilsons criterion in the itinerant ele...

  14. Creation of a criterion-referenced Military Optimal Performance Challenge.

    Science.gov (United States)

    Crowder, Todd A; Ferrara, Andrew L; Levinbook, Max D

    2013-10-01

    To compare an empirical, Army doctrine-based (endurance, strength, mobility, military relevant tasks), criterion-referenced, body mass (BM) unbiased Military Optimal Performance Challenge (MOPC) to the Army's Physical Fitness Test (APFT) and thus assisting commanders to determine military readiness. Militarily-relevant physical assessments were combined to create a composite MOPC score. The MOPC and APFT were administered to 20 male, military subjects during a 2-week period. Data collection included 3-Mile Run, Mobility Test, Upper/Lower Body Strength/Endurance, Simulated Casualty Evacuation Test. The APFT was administered through Army guidelines before MOPC data collection. The APFT was influenced by BM, lean body mass (LBM) (r = -0.44; r(2) = 0.20; p = 0.04), whereas MOPC was less impacted (r = 0.21; r(2) = 0.04; p = 0.32). Eight subjects, as viewed by %APFT, are "fit for duty" (80.6%); however, all eight subjects' mean score as %MOPC was <50%. The MOPC offers a robust approach to military readiness and is free of the confounding influence of BM. The MOPC is a unique assessment requiring a multitude of abilities to garner success and may assist in training for functional combat performance skills demanding high work capacities. Reprint & Copyright © 2013 Association of Military Surgeons of the U.S.

  15. A criterion-based obstetric morbidity audit in southern Thailand.

    Science.gov (United States)

    Liabsuetrakul, Tippawan; Promvijit, Thadpong; Pattanapisalsak, Chaiwat; Silalai, Sorawasa; Ampawa, Theeradet

    2008-11-01

    To evaluate the incidences of severe pre-eclampsia/eclampsia, obstructed labor, and postpartum hemorrhage in the 5 southernmost provinces of Thailand, and the quality of care for these conditions, using a modified version of a criterion-based clinical audit. We reviewed the medical records of the 3669 women admitted in the obstetric wards of 7 referral hospitals from January through March 2005. Of 515 severely morbid conditions recorded for 486 women (13.2%), there were 113 cases of pre-eclampsia, 320 of obstructed labor, and 82 of postpartum hemorrhage. Documentation for the diagnosis of obstructed labor was often incomplete. Condition severity and standard of care varied among hospitals. The most common indicators of substandard care were a lack of record of respiratory rate and tendon reflex for women with severe pre-eclampsia/eclampsia (35%); of antibiotic prophylaxis for those with obstructed labor (28%); and of record of urine output for those with postpartum hemorrhage (32%). Incomplete diagnosis documentation and evidence of substandard care were common, which warrants auditing for such problems and providing feedback to physicians.

  16. A novel SURE-based criterion for parametric PSF estimation.

    Science.gov (United States)

    Xue, Feng; Blu, Thierry

    2015-02-01

    We propose an unbiased estimate of a filtered version of the mean squared error--the blur-SURE (Stein's unbiased risk estimate)--as a novel criterion for estimating an unknown point spread function (PSF) from the degraded image only. The PSF is obtained by minimizing this new objective functional over a family of Wiener processings. Based on this estimated blur kernel, we then perform nonblind deconvolution using our recently developed algorithm. The SURE-based framework is exemplified with a number of parametric PSF, involving a scaling factor that controls the blur size. A typical example of such parametrization is the Gaussian kernel. The experimental results demonstrate that minimizing the blur-SURE yields highly accurate estimates of the PSF parameters, which also result in a restoration quality that is very similar to the one obtained with the exact PSF, when plugged into our recent multi-Wiener SURE-LET deconvolution algorithm. The highly competitive results obtained outline the great potential of developing more powerful blind deconvolution algorithms based on SURE-like estimates.

  17. Robust Deep Network with Maximum Correntropy Criterion for Seizure Detection

    Directory of Open Access Journals (Sweden)

    Yu Qi

    2014-01-01

    Full Text Available Effective seizure detection from long-term EEG is highly important for seizure diagnosis. Existing methods usually design the feature and classifier individually, while little work has been done for the simultaneous optimization of the two parts. This work proposes a deep network to jointly learn a feature and a classifier so that they could help each other to make the whole system optimal. To deal with the challenge of the impulsive noises and outliers caused by EMG artifacts in EEG signals, we formulate a robust stacked autoencoder (R-SAE as a part of the network to learn an effective feature. In R-SAE, the maximum correntropy criterion (MCC is proposed to reduce the effect of noise/outliers. Unlike the mean square error (MSE, the output of the new kernel MCC increases more slowly than that of MSE when the input goes away from the center. Thus, the effect of those noises/outliers positioned far away from the center can be suppressed. The proposed method is evaluated on six patients of 33.6 hours of scalp EEG data. Our method achieves a sensitivity of 100% and a specificity of 99%, which is promising for clinical applications.

  18. Nonlinear viscoelasticity and generalized failure criterion for biopolymer gels

    Science.gov (United States)

    Divoux, Thibaut; Keshavarz, Bavand; Manneville, Sébastien; McKinley, Gareth

    2016-11-01

    Biopolymer gels display a multiscale microstructure that is responsible for their solid-like properties. Upon external deformation, these soft viscoelastic solids exhibit a generic nonlinear mechanical response characterized by pronounced stress- or strain-stiffening prior to irreversible damage and failure, most often through macroscopic fractures. Here we show on a model acid-induced protein gel that the nonlinear viscoelastic properties of the gel can be described in terms of a 'damping function' which predicts the gel mechanical response quantitatively up to the onset of macroscopic failure. Using a nonlinear integral constitutive equation built upon the experimentally-measured damping function in conjunction with power-law linear viscoelastic response, we derive the form of the stress growth in the gel following the start up of steady shear. We also couple the shear stress response with Bailey's durability criteria for brittle solids in order to predict the critical values of the stress σc and strain γc for failure of the gel, and how they scale with the applied shear rate. This provides a generalized failure criterion for biopolymer gels in a range of different deformation histories. This work was funded by the MIT-France seed fund and by the CNRS PICS-USA scheme (#36939). BK acknowledges financial support from Axalta Coating Systems.

  19. The effects of criterion variability on relative operating characteristics

    Energy Technology Data Exchange (ETDEWEB)

    Brown, W.S. [Brookhaven Natl. Lab., Bldg. 130, Upton, NY 11973-5000 (United States); Emmerich, D.S. [State Univ. of New York at Stony Brook, Stony Brook, NY 11974 (United States)

    1995-05-01

    The form of the relative operating characteristic (ROC) describing auditory detection typically differs from that expected based on the assumption that the observer`s responses reflect underlying distributions that are normal and of equal variance [e.g., Green and Swets, {ital Signal} {ital Detection} {ital Theory} {ital and} {ital Psychophysics}]. Specifically, it is found that binormal ROCs often have slopes less than one, and are not strictly linear [Watson {ital et} {ital al}., 283--288 (1964)]. It has been suggested that nonlinear binormal ROCs may be the result of extreme criteria being more variable than those more centrally positioned [Emmerich and Binder, J. Acoust. Soc. Am. Suppl. 1 {bold 65}, S59 (1979)]. The forms of rating ROCs obtained in an experiment designed to reveal the effects of such variability were consistent with the proposition that criteria associated with ``no`` responses are more variable than those associated with ``yes`` responses. Criterion operating characteristics [Wickelgren, J. Math. Psychol. {bold 5}, 102--122], which reflect the relative locations and variances of the boundaries of confidence categories, favored the same interpretation. It is concluded that the variability of criteria defining categories of rated confidence is sizable and not necessarily constant across criteria, and that such variability significantly influences the forms of empirical ROCs determined using confidence ratings in auditory signal detection.

  20. Controllability, not chaos, key criterion for ocean state estimation

    Science.gov (United States)

    Gebbie, Geoffrey; Hsieh, Tsung-Lin

    2017-07-01

    The Lagrange multiplier method for combining observations and models (i.e., the adjoint method or 4D-VAR) has been avoided or approximated when the numerical model is highly nonlinear or chaotic. This approach has been adopted primarily due to difficulties in the initialization of low-dimensional chaotic models, where the search for optimal initial conditions by gradient-descent algorithms is hampered by multiple local minima. Although initialization is an important task for numerical weather prediction, ocean state estimation usually demands an additional task - a solution of the time-dependent surface boundary conditions that result from atmosphere-ocean interaction. Here, we apply the Lagrange multiplier method to an analogous boundary control problem, tracking the trajectory of the forced chaotic pendulum. Contrary to previous assertions, it is demonstrated that the Lagrange multiplier method can track multiple chaotic transitions through time, so long as the boundary conditions render the system controllable. Thus, the nonlinear timescale poses no limit to the time interval for successful Lagrange multiplier-based estimation. That the key criterion is controllability, not a pure measure of dynamical stability or chaos, illustrates the similarities between the Lagrange multiplier method and other state estimation methods. The results with the chaotic pendulum suggest that nonlinearity should not be a fundamental obstacle to ocean state estimation with eddy-resolving models, especially when using an improved first-guess trajectory.

  1. Controllability, not chaos, key criterion for ocean state estimation

    Directory of Open Access Journals (Sweden)

    G. Gebbie

    2017-07-01

    Full Text Available The Lagrange multiplier method for combining observations and models (i.e., the adjoint method or 4D-VAR has been avoided or approximated when the numerical model is highly nonlinear or chaotic. This approach has been adopted primarily due to difficulties in the initialization of low-dimensional chaotic models, where the search for optimal initial conditions by gradient-descent algorithms is hampered by multiple local minima. Although initialization is an important task for numerical weather prediction, ocean state estimation usually demands an additional task – a solution of the time-dependent surface boundary conditions that result from atmosphere–ocean interaction. Here, we apply the Lagrange multiplier method to an analogous boundary control problem, tracking the trajectory of the forced chaotic pendulum. Contrary to previous assertions, it is demonstrated that the Lagrange multiplier method can track multiple chaotic transitions through time, so long as the boundary conditions render the system controllable. Thus, the nonlinear timescale poses no limit to the time interval for successful Lagrange multiplier-based estimation. That the key criterion is controllability, not a pure measure of dynamical stability or chaos, illustrates the similarities between the Lagrange multiplier method and other state estimation methods. The results with the chaotic pendulum suggest that nonlinearity should not be a fundamental obstacle to ocean state estimation with eddy-resolving models, especially when using an improved first-guess trajectory.

  2. An opening criterion for dust gaps in protoplanetary discs

    Science.gov (United States)

    Dipierro, Giovanni; Laibe, Guillaume

    2017-08-01

    We aim to understand under which conditions a low-mass planet can open a gap in viscous dusty protoplanetary discs. For this purpose, we extend the theory of dust radial drift to include the contribution from the tides of an embedded planet and from the gas viscous forces. From this formalism, we derive (I) a grain-size-dependent criterion for dust gap opening in discs, (II) an estimate of the location of the outer edge of the dust gap and (III) an estimate of the minimum Stokes number above which low-mass planets are able to carve gaps that appear only in the dust disc. These analytical estimates are particularly helpful to appraise the minimum mass of a hypothetical planet carving gaps in discs observed at long wavelengths and high resolution. We validate the theory against 3D smoothed particle hydrodynamics simulations of planet-disc interaction in a broad range of dusty protoplanetary discs. We find a remarkable agreement between the theoretical model and the numerical experiments.

  3. Fluency: an aim in teaching and a criterion in assessment

    Directory of Open Access Journals (Sweden)

    Aud Marit Simensen

    2010-05-01

    Full Text Available This article investigates the concept ‘fluency’ from different perspectives. When fluency is an aim in teaching, a thorough comprehension of the concept among teachers is a prerequisite for appropriate planning of instruction, including the choice of appropriate classroom activities. When fluency is an assessment criterion, it is even more important that examiners have a shared perception of the concept. The present article starts by presenting common perceptions of the concept and goes on to explore some of the current research. Next, it provides a historical overview of the place of fluency in teaching theory and explains some of the preconditions for the inclusion of this concept among teaching objectives and assessment criteria. It will also, as an illustration, give an outline of the position of the concept over time in the Norwegian school system on the basis of an analysis of the relevant syllabuses. Finally, the article explicates the notion of language use as a complex cognitive skill and explores current method¬ological ideas about teaching towards fluency.

  4. New dental implant selection criterion based on implant design.

    Science.gov (United States)

    El-Anwar, Mohamed I; El-Zawahry, Mohamed M; Ibraheem, Eman M; Nassani, Mohammad Zakaria; ElGabry, Hisham

    2017-01-01

    A comparative study between threaded and plain dental implant designs was performed to find out a new criterion for dental implant selection. Several dental implant designs with a systematic increase in diameter and length were positioned in a cylindrical-shaped bone section and analyzed using finite element method. Four loading types were tested on different dental implant designs; tension of 50 N, compression of 100 N, bending of 20 N, and torque of 2 Nm, to derive design curves. Better stress distribution on both spongy and cortical bone was noted with an increase in dental implant diameter and length. With the increase in dental implant side area, a stress reduction in the surrounding bones was observed, where threaded dental implants showed better behavior over the plain ones. Increasing value of ratio between dental implant side area and its cross-sectional area reduces stresses transferred to cortical and spongy bones. The use of implants with higher ratio of side area to cross-section area, especially with weak jaw bone, is recommended.

  5. Some remarks on relativistic diffusion and the spectral dimension criterion

    Science.gov (United States)

    Muniz, C. R.; Cunha, M. S.; Filho, R. N. Costa; Bezerra, V. B.

    2015-01-01

    The spectral dimension ds for high energies is calculated using the Relativistic Schrödinger Equation Analytically Continued (RSEAC) instead of the so-called Telegraph's equation (TE), in both ultraviolet (UV) and infrared (IR) regimens. Regarding the TE, the recent literature presents difficulties related to its stochastic derivation and interpretation, advocating the use of the RSEAC to properly describe the relativistic diffusion phenomena. Taking into account that the Lorentz symmetry is broken in UV regime at Lifshitz point, we show that there exists a degeneracy in very high energies, meaning that both the RSEAC and TE correctly describe the diffusion processes at these energy scales, at least under the spectral dimension criterion. In fact, both the equations yield the same result, namely, ds=2 , a dimensional reduction that is compatible with several theories of quantum gravity. This result is reached even when one takes into account a cosmological model, as for example, the de Sitter universe. On the other hand, in the IR regimen, such degeneracy is lifted in favor of the approach via TE, due to the fact that only this equation provides the correct value for ds, which is equal to the actual number of spacetime dimensions, i.e., ds=4 , while RSEAC yields ds=3 , so that a diffusing particle described by this method experiences a three-dimensional spacetime.

  6. Beyond Criterion A1: the effects of relational and non-relational traumatic events.

    Science.gov (United States)

    Anders, Samantha L; Shallcross, Sandra L; Frazier, Patricia A

    2012-01-01

    Trauma research has historically focused on Criterion A1 traumas, neglecting many other negative interpersonal events that have been shown to lead to posttraumatic stress disorder (PTSD; S. L. Anders, P. A. Frazier, & S. Frankfurt, 2011 ). Trauma research has also focused primarily on PTSD and neglected other important outcomes, such as relationship functioning. This study aimed to assess a broader range of events, including many Criterion A1 interpersonal events; assess the cumulative impact of event exposure; and examine the relation between event exposure and a broad range of outcomes, including relationship functioning. A sample of 181 undergraduate students completed measures assessing exposure to a broad range of events, their worst lifetime event, and current psychological (e.g., psychological distress) and relationship (e.g., partner trust) functioning. Results suggested that non-Criterion A1 relational events were very common in our sample. The number of lifetime relational events experienced, whether Criterion A1 or non-Criterion A1, was strongly and consistently associated with all outcomes. The number of lifetime Criterion A1 non-relational events experienced was significantly associated with current PTSD symptoms but was not associated with other mental health and relationship outcomes. No differences were found between Criterion A1 relational, non-Criterion A1 relational, and Criterion A1 non-relational worst events on any of the mental health or relationship measures. Implications for further research and interventions are discussed.

  7. Characterizing the successful student in general chemistry and physical science classes in terms of Jung's personality types as identified by the Myers-Briggs Type Indicator

    Science.gov (United States)

    Riley, Wayne David

    1998-11-01

    A student's success in a science class can depend upon previous experiences, motivation, and the level of interest in the subject. Since psychological type is intrinsic to a person's whole being, it can be influential upon the student's motivation and interests. Thus, a study of student psychological types versus the level of success in a class, as measured by a percentage, has potential to uncover certain personality characteristics which may be helpful to or which may hinder a student's learning environment. This study was initiated, using the Myers-Briggs Type Indicator, to evaluate any correlation between a student's personality type and his/her performance in a science class. A total of 1041 students from three classes: Chemistry 121/122, Chemistry 112, Physical Science 100, volunteered for the study. An analysis of variance (ANOVA) was used to determine the levels of significance among sixteen personality types' averages. The results reveal that for the Chemistry 1121/122 course, the average score of the INTJ personality type was 5.1 to 12.6 points higher than every other personality type. The ANOVA identifies 3 personality types with averages significantly below the INTJ at the p < 0.05 significance level. The ANOVA analysis for the Chemistry 112 course identified significances between student scores at p = 0.08. The significance level for the differences among scores for the Physical Science 100 course was determined at a level of p = 0.02. Significance levels for p < 0.05 and <0.01 were identified between several groups in this course. The data suggest, that although personality type may not predict a particular student's success in a science class, students with certain personality traits may be favored in a chemistry class due the structure of the instruction and the presentation of the subject matter.

  8. Failure criterion for notched fiber-dominated composite laminates

    Science.gov (United States)

    Vaidya, Rajesh Suresh

    1997-12-01

    Predicting the residual strength of composite laminates in the presence of flaws such as cracks has been an important research problem for the last two decades. Most existing models for predicting notched residual strength are of a 'curve fit' nature, wherein the model parameters, e.g., characteristic distance or damage zone size are chosen so as to fit the experimental data. Such parameters have been shown to depend on notch size and laminate orientation, and as such, cannot be considered material constants for the composite system. In the present research, a new model is proposed for predicting residual strength or fracture toughness of notched fiber dominated composite laminates under pure Mode I or mixed-mode loading conditions. The fracture toughness of such laminates is related to the fracture toughness of the principal load bearing plies within them. A new material parameter is introduced to predict laminate fracture toughness, and it is shown to be independent of laminate orientation. Experimental results indicate that the model can successfully predict the failure stress for notched laminates with arbitrary crack orientations (mixed-mode loading). The effect of ply thickness on notched strength of cross-ply and quasi-isotropic laminates is also investigated in this study. Results indicate that the ply thickness effect is more significant in cross-ply laminate configurations. A 2D finite element analysis is conducted to study the effect of crack tip damage in the form of splitting and delamination on the stress distribution near the crack tip. The experimentally observed damage zones in cross-ply laminates are modeled, and a criterion is established to predict the growth of matrix cracks in the 0sp° layer. It is shown that the matrix crack growth is controlled by the Mode II strain energy release rate. The effect of matrix damage on stress relaxation and subsequent failure is investigated and conclusions are drawn to establish the regime where the failure

  9. A Topological Criterion for Filtering Information in Complex Brain Networks.

    Directory of Open Access Journals (Sweden)

    Fabrizio De Vico Fallani

    2017-01-01

    Full Text Available In many biological systems, the network of interactions between the elements can only be inferred from experimental measurements. In neuroscience, non-invasive imaging tools are extensively used to derive either structural or functional brain networks in-vivo. As a result of the inference process, we obtain a matrix of values corresponding to a fully connected and weighted network. To turn this into a useful sparse network, thresholding is typically adopted to cancel a percentage of the weakest connections. The structural properties of the resulting network depend on how much of the inferred connectivity is eventually retained. However, how to objectively fix this threshold is still an open issue. We introduce a criterion, the efficiency cost optimization (ECO, to select a threshold based on the optimization of the trade-off between the efficiency of a network and its wiring cost. We prove analytically and we confirm through numerical simulations that the connection density maximizing this trade-off emphasizes the intrinsic properties of a given network, while preserving its sparsity. Moreover, this density threshold can be determined a-priori, since the number of connections to filter only depends on the network size according to a power-law. We validate this result on several brain networks, from micro- to macro-scales, obtained with different imaging modalities. Finally, we test the potential of ECO in discriminating brain states with respect to alternative filtering methods. ECO advances our ability to analyze and compare biological networks, inferred from experimental data, in a fast and principled way.

  10. An examination of the structure and predictability of Myers-Briggs Type Indicator preferences using a job component validity strategy based on the Common-Metric Questionnaire

    OpenAIRE

    Brown, Reagan

    1995-01-01

    When criterion related validity studies are not feasible due to statistical power problems, a number of alternate methods for validation are available. Indirect validity offers a few of these strategies. One of these is synthetic validity which, in its most generalized form, is the linking of predictor items or tests directly to a job's elements. Three main operational definitions exist for synthetic validity, but only one, job component validity (JCV), actually specifies minimum ...

  11. A new risk-based screening criterion for treatment-demanding retinopathy of prematurity in Denmark

    DEFF Research Database (Denmark)

    Slidsborg, Carina; Forman, Julie Lyng; Rasmussen, Steen Christian

    2011-01-01

    The aim of this study was to uncover the most effective and safe criterion to implement for retinopathy of prematurity screening in Denmark.......The aim of this study was to uncover the most effective and safe criterion to implement for retinopathy of prematurity screening in Denmark....

  12. Imposing D-optimality criterion on the design regions of the Central ...

    African Journals Online (AJOL)

    Imposing D-optimality criterion on the design regions of the Central Composite Designs (CCD). M.P. Iwundu, O.A.P. Otaru. Abstract. The effect of D-optimality criterion in the construction of N-point exact designs on the design regions of the face-centered central composite design, rotatable (circumscribed) central composite ...

  13. A criterion-related validity study of the nursing-care dependency (NCD) scale

    NARCIS (Netherlands)

    Dijkstra, A.; Buist, G.; Dassen, Th.W.N.

    The purpose of this study was to examine some aspects of the criterion-related validity of the Nursing-Care Dependency (NCD) scale. This 15-item counting scale has recently been developed for assessing the care dependency of demented or mentally handicapped in-patients. Its criterion-related

  14. Criterion 7: Legal, institutional, and economic framework for forest conservation and sustainable management

    Science.gov (United States)

    Stephen R. Shifley; Francisco X. Aguilar; Nianfu Song; Susan I. Stewart; David J. Nowak; Dale D. Gormanson; W. Keith Moser; Sherri Wormstead; Eric J. Greenfield

    2012-01-01

    This criterion focuses on the social context of forests—the laws, policies, administrative rules, and social and economic institutions—that governs forest resource management and use. What society permits or restricts, encourages or discourages all influence the sustainability of forest resources. Criterion 7 captures this by turning attention to all the different...

  15. The New DSM-5 Impairment Criterion: A Challenge to Early Autism Spectrum Disorder Diagnosis?

    Science.gov (United States)

    Zander, Eric; Bölte, Sven

    2015-01-01

    The possible effect of the DSM-5 impairment criterion on diagnosing autism spectrum disorder (ASD) in young children was examined in 127 children aged 20-47 months with a DSM-IV-TR clinical consensus diagnosis of ASD. The composite score of the Vineland Adaptive Behavior Scales (VABS) served as a proxy for the DSM-5 impairment criterion. When…

  16. Energy-efficient induction motors designing with application of a modified criterion of reduced costs

    Directory of Open Access Journals (Sweden)

    V.S. Petrushin

    2014-03-01

    Full Text Available The paper introduces a modified criterion of reduced costs that employs coefficients of operation significance and priority of ohmic loss accounting to allow matching maximum efficiency with minimum reduced costs. Impact of the inflation factor on the criterion of reduced costs is analyzed.

  17. The Bohm Criterion for Radiofrequency Discharges - a Numerical Verification Based on Poisson Equation

    NARCIS (Netherlands)

    Meijer, P. M.; W. J. Goedheer,

    1993-01-01

    Recently it was shown that, by using the analysis of electrostatic waves entering the plasma-sheath edge, the direct-current (dc) Bohm criterion also holds for discharges under radio-frequency (rf) conditions. In this paper, the influence of Bohm's criterion on the sheath characteristics for

  18. Evidence for the Criterion Validity and Clinical Utility of the Pathological Narcissism Inventory

    Science.gov (United States)

    Thomas, Katherine M.; Wright, Aidan G. C.; Lukowitsky, Mark R.; Donnellan, M. Brent; Hopwood, Christopher J.

    2012-01-01

    In this study, the authors evaluated aspects of criterion validity and clinical utility of the grandiosity and vulnerability components of the Pathological Narcissism Inventory (PNI) using two undergraduate samples (N = 299 and 500). Criterion validity was assessed by evaluating the correlations of narcissistic grandiosity and narcissistic…

  19. Six Single-Administration Reliability Coefficients for Criterion-Referenced Tests: A Comparative Study.

    Science.gov (United States)

    Downing, Steven M.; Mehrens, William A.

    Four criterion-referenced reliability coefficicents were compared to the Kuder-Richardson estimates and to each other. The Kuder-Richardson formulas 20 and 21, the Livingston, the Subkoviak and two Huynh coefficients were computed for a random sample of 33 criterion-referenced tests. The Subkoviak coefficient yielded the highest mean value;…

  20. A criterion for estimating the probability of microporosity formation in castings

    Science.gov (United States)

    Poliakov, S. N.; Korotchenko, A. Yu; Timchenko, S. L.

    2017-11-01

    The study tested a new dimensionless criterion for microporosity formation, which takes a number of significant technological factors into account, including atmospheric and metallostatic pressure, and alloy gas saturation. We recommend using the criterion in systems that model casting solidification to predict microporosity formation more accurately

  1. Validation of Criterion-Referenced Standards for Tests of Arm and Shoulder Girdle Strength and Endurance.

    Science.gov (United States)

    Rutherford, William J.; Corbin, Charles B.

    1994-01-01

    This study established criterion-referenced standards for selected tests of arm and shoulder girdle strength and endurance in college females. Tests of trained and untrained students using the contrasting groups method yielded criterion cutoff scores that classified subjects as trained or untrained based on upper arm and shoulder girdle resistance…

  2. A Graph Theoretic Criterion for Determining the Number of Clusters in a Data Set.

    Science.gov (United States)

    Krolak-Schwerdt, Sabine; Eckes, Thomas

    1992-01-01

    Procedures for determining the number of clusters in a data set are explored. A proposed stopping rule, the GRAPH criterion, is compared to four stopping rules currently in use. The GRAPH criterion's mathematically attractive properties and utility in solving the number-of-clusters problem are demonstrated. (SLD)

  3. A Controlled Evaluation of the Distress Criterion for Binge Eating Disorder

    Science.gov (United States)

    Grilo, Carlos M.; White, Marney A.

    2011-01-01

    Objective: Research has examined various aspects of the validity of the research criteria for binge eating disorder (BED) but has yet to evaluate the utility of Criterion C, "marked distress about binge eating." This study examined the significance of the marked distress criterion for BED using 2 complementary comparison groups. Method:…

  4. Characteristics of Criterion-Referenced Instruments: Implications for Materials Selection for the Learning Disabled.

    Science.gov (United States)

    Blasi, Joyce F.

    Discussed are characteristics of criterion referenced reading tests for use with learning disabled (LD) children, and analyzed are the Basic Educational Skills Inventory (BESI), the Prescriptive Reading Inventory (PRI), and the Cooper-McGuire Diagnostic Work-Analysis Test (CooperMcGuire). Criterion referenced tests are defined; and problems in…

  5. An Optimum Switching Criterion for a Third-order Contactor Acceleration Control System

    Science.gov (United States)

    Passera, Anthony L; Willoh, Ross G , R

    1956-01-01

    A switching criterion for optimum performance of a third-order contractor acceleration control system having complex roots is presented. Analytical and analog-computer methods are utilized to determine this criterion. The resulting optimum transient responses are presented and compared with those of an equivalent linear system.

  6. Rayleigh Number Criterion for Formation of A-Segregates in Steel Castings and Ingots

    DEFF Research Database (Denmark)

    Rad, M. Torabi; Kotas, Petr; Beckermann, C.

    2013-01-01

    A Rayleigh number-based criterion is developed for predicting the formation of A-segregates in steel castings and ingots. The criterion is calibrated using available experimental data for ingots involving 27 different steel compositions. The critical Rayleigh number above which A-segregates can b...

  7. Evaluation of Regression Models of Balance Calibration Data Using an Empirical Criterion

    Science.gov (United States)

    Ulbrich, Norbert; Volden, Thomas R.

    2012-01-01

    An empirical criterion for assessing the significance of individual terms of regression models of wind tunnel strain gage balance outputs is evaluated. The criterion is based on the percent contribution of a regression model term. It considers a term to be significant if its percent contribution exceeds the empirical threshold of 0.05%. The criterion has the advantage that it can easily be computed using the regression coefficients of the gage outputs and the load capacities of the balance. First, a definition of the empirical criterion is provided. Then, it is compared with an alternate statistical criterion that is widely used in regression analysis. Finally, calibration data sets from a variety of balances are used to illustrate the connection between the empirical and the statistical criterion. A review of these results indicated that the empirical criterion seems to be suitable for a crude assessment of the significance of a regression model term as the boundary between a significant and an insignificant term cannot be defined very well. Therefore, regression model term reduction should only be performed by using the more universally applicable statistical criterion.

  8. A completeness criterion for Kaniadakis, Abe and two-parameter generalized statistical theories

    Science.gov (United States)

    Oikonomou, Thomas; Baris Bagci, G.

    2010-08-01

    We recently provided a criterion of completeness valid for any generalized thermostatistics to check whether they form a bijection from ℝ +/ℝ (set of positive real numbers/all real numbers) to ℝ/ℝ + in a previous paper. In the current work, we apply this criterion to Kaniadakis, Abe and two-parameter generalized functions and obtain their respective validity ranges.

  9. Weight concern should not be a necessary criterion for the eating disorders: a polemic.

    Science.gov (United States)

    Palmer, R L

    1993-12-01

    Problems associated with the inclusion of weight concern as a necessary and defining criterion for the diagnosis of the eating disorders are reviewed. It is proposed that the substitution of the criterion of eating restraint that is overinvested by the subject might have advantages for both clinical classification and for research.

  10. Does the Lowest Bid Price Evaluation Criterion Make for a More Efficient Public Procurement Selection Criterion? (Case of the Czech Republic

    Directory of Open Access Journals (Sweden)

    Ochrana František

    2015-06-01

    Full Text Available Through the institute of public procurement a considerable volume of financial resources is allocated. It is therefore in the interest of contracting entities to seek ways of how to achieve an efficient allocation of resources. Some public contract-awarding entities, along with some public-administration authorities in the Czech Republic, believe that the use of a single evaluation criterion (the lowest bid price results in a more efficient tender for a public contract. It was found that contracting entities in the Czech Republic strongly prefer to use the lowest bid price criterion. Within the examined sample, 86.5 % of public procurements were evaluated this way. The analysis of the examined sample of public contracts proved that the choice of an evaluation criterion, even the preference of the lowest bid price criterion, does not have any obvious impact on the final cost of a public contract. The study concludes that it is inappropriate to prefer the criterion of the lowest bid price within the evaluation of public contracts that are characterised by their complexity (including public contracts for construction works and public service contracts. The findings of the Supreme Audit Office related to the inspection of public contracts indicate that when using the lowest bid price as an evaluation criterion, a public contract may indeed be tendered with the lowest bid price, but not necessarily the best offer in terms of supplied quality. It is therefore not appropriate to use the lowest bid price evaluation criterion to such an extent for the purpose of evaluating work and services. Any improvement to this situation requires a corresponding amendment to the Law on Public Contracts and mainly a radical change in the attitude of the Office for the Protection of Competition towards proposed changes, as indicated within the conclusions and recommendations proposed by this study.

  11. Generalized Majority Logic Criterion to Analyze the Statistical Strength of S-Boxes

    Science.gov (United States)

    Hussain, Iqtadar; Shah, Tariq; Gondal, Muhammad Asif; Mahmood, Hasan

    2012-05-01

    The majority logic criterion is applicable in the evaluation process of substitution boxes used in the advanced encryption standard (AES). The performance of modified or advanced substitution boxes is predicted by processing the results of statistical analysis by the majority logic criteria. In this paper, we use the majority logic criteria to analyze some popular and prevailing substitution boxes used in encryption processes. In particular, the majority logic criterion is applied to AES, affine power affine (APA), Gray, Lui J, residue prime, S8 AES, Skipjack, and Xyi substitution boxes. The majority logic criterion is further extended into a generalized majority logic criterion which has a broader spectrum of analyzing the effectiveness of substitution boxes in image encryption applications. The integral components of the statistical analyses used for the generalized majority logic criterion are derived from results of entropy analysis, contrast analysis, correlation analysis, homogeneity analysis, energy analysis, and mean of absolute deviation (MAD) analysis.

  12. Negative-Margin Criterion for Impact-Response Prediction

    Science.gov (United States)

    Anderson, Denton

    2006-01-01

    Some space missions require a nuclear-power source to generate electrical power to meet mission objectives. At present, the nuclear-power source is an assembly of modular heat sources called the general purpose heat source (GPHS) modules. Each module comprises graphite shells designed to protect iridium-alloy clads which serve as the primary containment shells for the radioactive, heat-producing material. In the course of launching the space vehicle to perform its mission the nuclear heat source may be exposed to severe accident environments. One particular environment is a primary impact event where individual GPHS modules impact hard surfaces at speeds in the range of 50 meters per second or more. Tests have shown that some clads may be breached in particularly severe impacts and release a small fraction of their contents. This paper presents an empirical model for predicting essential ingredients for assessing the risk associated with primary impact events. The ingredients include: clad failure probability, release fraction of clad contents, characterization of the released material in terms of particle-size distribution and a means to estimate uncertainty in the prediction process. The empirical model focuses on the deformation of the clads and their capability to withstand deformation without breaching, measured by ductility. The basic criterion used to estimate all ingredients is called ``negative margin''. The procedure for estimating risk factors entails calculation of clad distortion by, e.g. hydrocode simulation, and high-strain-rate ductility of the iridium alloy. Negative margin is a linear combination of distortion and ductility. Regression equations derived from test data are used to calculate the clad failure probability and the fractional activity release as functions of negative margin. The mass-based particle-size distribution is calculated as a function of release fraction. Cumulative uncertainty in this computing process is evaluated using

  13. Os tipos psicológicos na psicologia analítica de Carl Gustav Jung e o inventário de personalidade “Myers-Briggs Type Indicator (MBTI)”: contribuições para a psicologia educacional, organizacional e clínicaThe psychological types in analytical psychology of Carl Gustav Jung and the inventory of personality “Myers-Briggs Type Indicator (MBTI)”: contributions for the educational, organizational and clinical psychology

    OpenAIRE

    Ramos, Luís Marcelo Alves

    2008-01-01

    O texto apresenta os princípios da Teoria dos Tipos Psicológicos, a mais conhecida face da Psicologia Analítica do psicólogo e psiquiatra suíço Carl Gustav Jung (1875-1961), bem como os fundamentos do Inventário de Personalidade “Myers-Briggs Type Indicator (MBTI)”, constituído a partir da tipologia junguiana, e que vem sendo cada vez mais utilizado nos campos da Psicologia Educacional, Organizacional e Clínica. Palavras-chave Psicologia analítica; Teorias da personalidade; Tipos psi...

  14. Efficiency of Event-Based Sampling According to Error Energy Criterion

    Directory of Open Access Journals (Sweden)

    Marek Miskowicz

    2010-03-01

    Full Text Available The paper belongs to the studies that deal with the effectiveness of the particular event-based sampling scheme compared to the conventional periodic sampling as a reference. In the present study, the event-based sampling according to a constant energy of sampling error is analyzed. This criterion is suitable for applications where the energy of sampling error should be bounded (i.e., in building automation, or in greenhouse climate monitoring and control. Compared to the integral sampling criteria, the error energy criterion gives more weight to extreme sampling error values. The proposed sampling principle extends a range of event-based sampling schemes and makes the choice of particular sampling criterion more flexible to application requirements. In the paper, it is proved analytically that the proposed event-based sampling criterion is more effective than the periodic sampling by a factor defined by the ratio of the maximum to the mean of the cubic root of the signal time-derivative square in the analyzed time interval. Furthermore, it is shown that the sampling according to energy criterion is less effective than the send-on-delta scheme but more effective than the sampling according to integral criterion. On the other hand, it is indicated that higher effectiveness in sampling according to the selected event-based criterion is obtained at the cost of increasing the total sampling error defined as the sum of errors for all the samples taken.

  15. Efficiency of event-based sampling according to error energy criterion.

    Science.gov (United States)

    Miskowicz, Marek

    2010-01-01

    The paper belongs to the studies that deal with the effectiveness of the particular event-based sampling scheme compared to the conventional periodic sampling as a reference. In the present study, the event-based sampling according to a constant energy of sampling error is analyzed. This criterion is suitable for applications where the energy of sampling error should be bounded (i.e., in building automation, or in greenhouse climate monitoring and control). Compared to the integral sampling criteria, the error energy criterion gives more weight to extreme sampling error values. The proposed sampling principle extends a range of event-based sampling schemes and makes the choice of particular sampling criterion more flexible to application requirements. In the paper, it is proved analytically that the proposed event-based sampling criterion is more effective than the periodic sampling by a factor defined by the ratio of the maximum to the mean of the cubic root of the signal time-derivative square in the analyzed time interval. Furthermore, it is shown that the sampling according to energy criterion is less effective than the send-on-delta scheme but more effective than the sampling according to integral criterion. On the other hand, it is indicated that higher effectiveness in sampling according to the selected event-based criterion is obtained at the cost of increasing the total sampling error defined as the sum of errors for all the samples taken.

  16. Exclusion as a Criterion for Selecting Socially Vulnerable Population Groups

    Directory of Open Access Journals (Sweden)

    Aleksandra Anatol’evna Shabunova

    2016-05-01

    Full Text Available The article considers theoretical aspects of a scientific research “The Mechanisms for Overcoming Mental Barriers of Inclusion of Socially Vulnerable Categories of the Population for the Purpose of Intensifying Modernization in the Regional Community” (RSF grant No. 16-18-00078. The authors analyze the essence of the category of “socially vulnerable groups” from the legal, economic and sociological perspectives. The paper shows that the economic approach that uses the criterion “the level of income and accumulated assets” when defining vulnerable population groups prevails in public administration practice. The legal field of the category based on the economic approach is defined by the concept of “the poor and socially unprotected categories of citizens”. With the help of the analysis of theoretical and methodological aspects of this issue, the authors show that these criteria are a necessary but not sufficient condition for classifying the population as being socially vulnerable. Foreign literature associates the phenomenon of vulnerability with the concept of risks, with the possibility of households responding to them and with the likelihood of losing the well-being (poverty theory; research areas related to the means of subsistence, etc.. The asset-based approaches relate vulnerability to the poverty that arises due to lack of access to tangible and intangible assets. Sociological theories presented by the concept of social exclusion pay much attention to the breakdown of social ties as a source of vulnerability. The essence of social exclusion consists in the inability of people to participate in important aspects of social life (in politics, labor markets, education and healthcare, cultural life, etc. though they have all the rights to do so. The difference between the concepts of exclusion and poverty is manifested in the displacement of emphasis from income inequality to limited access to rights. Social exclusion is

  17. A stopping criterion for the iterative solution of partial differential equations

    Science.gov (United States)

    Rao, Kaustubh; Malan, Paul; Perot, J. Blair

    2018-01-01

    A stopping criterion for iterative solution methods is presented that accurately estimates the solution error using low computational overhead. The proposed criterion uses information from prior solution changes to estimate the error. When the solution changes are noisy or stagnating it reverts to a less accurate but more robust, low-cost singular value estimate to approximate the error given the residual. This estimator can also be applied to iterative linear matrix solvers such as Krylov subspace or multigrid methods. Examples of the stopping criterion's ability to accurately estimate the non-linear and linear solution error are provided for a number of different test cases in incompressible fluid dynamics.

  18. Construction, criterions and levels of net culture's formedness ofteacher of informatic in system of improvement qualification

    Directory of Open Access Journals (Sweden)

    Галина Андреевна Будникова

    2011-06-01

    Full Text Available The author describes the content of idea «teacher of informatic's net culture», carries out an analysis its construction, components and criterions, leads indicators of net culture's formedness for each level.

  19. An experimental verification of a criterion for forming metastable phases in containerless solidification

    Science.gov (United States)

    Kuribayashi, K.; Kato, H.; Nagayama, K.; Inatomi, Y.; Kumar, M. S. Vijaya

    2015-04-01

    On the thermodynamic condition for forming a metastable phase from undercooled melt in a containerless state, we had proposed a criterion that crystals will preferentially form if they have a smaller entropy of fusion than the entropy of fusion of equilibrium crystals (Kuribayashi et al., Mater. Sci. Eng., A 449-451, 675 (2007)). This criterion is proposed for being applied to materials that exhibit a faceted interface, such as semiconductors and oxides. However, no experimental data that support this criterion have been obtained. From this point, we used an aerodynamic levitator as a tool for forming metastable phases from undercooled melt and verified the above-mentioned criterion using LnFeO3 (Ln: lanthanide and Y) as the model material. In addition, the condition for double recalescence, which corresponds to forming metastable phases and stable phases, was discussed in terms of competitive 2D isomorphic nucleation of the metastable phase and 3D polymorphic nucleation of the stable phase.

  20. On the measurement of criterion noise in signal detection theory: the case of recognition memory.

    Science.gov (United States)

    Kellen, David; Klauer, Karl Christoph; Singmann, Henrik

    2012-07-01

    Traditional approaches within the framework of signal detection theory (SDT; Green & Swets, 1966), especially in the field of recognition memory, assume that the positioning of response criteria is not a noisy process. Recent work (Benjamin, Diaz, & Wee, 2009; Mueller & Weidemann, 2008) has challenged this assumption, arguing not only for the existence of criterion noise but also for its large magnitude and substantive contribution to individuals' performance. A review of these recent approaches for the measurement of criterion noise in SDT identifies several shortcomings and confoundings. A reanalysis of Benjamin et al.'s (2009) data sets as well as the results from a new experimental method indicate that the different forms of criterion noise proposed in the recognition memory literature are of very low magnitudes, and they do not provide a significant improvement over the account already given by traditional SDT without criterion noise. Copyright 2012 APA, all rights reserved.

  1. A new criterion for identifying breaks in monsoon conditions over the Indian subcontinent

    Digital Repository Service at National Institute of Oceanography (India)

    RameshKumar, M.R.; Dessai, U.R.P.

    The presence or absence of prolonged breaks over the Indian subcontinent during the mid monsoon months of July and August decides the fate of the monsoon rainfall. Using a new criterion for identifying the breaks, we have catalogued them...

  2. TEMPERATURE-DEFORMATION CRITERION OF OPTIMIZATION OF FINE DRAWING HIGH CARBON WIRE ROUTE

    Directory of Open Access Journals (Sweden)

    Y. L. Bobarikin

    2012-01-01

    Full Text Available The temperature-deformation criterion of assessment and optimization of routes of the thin high-carbon wire drawing enabling to increase plastic properties of wire at retaining of its durability is offered.

  3. A risk-based microbiological criterion that uses the relative risk as the critical limit

    DEFF Research Database (Denmark)

    Andersen, Jens Kirk; Nørrung, Birgit; da Costa Alves Machado, Simone

    2015-01-01

    A risk-based microbiological criterion is described, that is based on the relative risk associated to the analytical result of a number of samples taken from a food lot. The acceptable limit is a specific level of risk and not a specific number of microorganisms, as in other microbiological...... estimate can be obtained. This relative risk estimate then can be compared with a critical value, defined by the criterion. This microbiological criterion based on a relative risk limit is particularly useful when quantitative enumeration data are available and when the prevalence of the microorganism...... of concern is relatively high. The use of the approach is therefore illustrated with an example of Campylobacter in broiler meat. It shows that this microbiological criterion can be applied in practice. An advantage of the method is that the acceptable limit is directly defined in terms of risk, without...

  4. The periodization of wheat embryogenesis on the base of anatomical, morphological and time criterions

    Directory of Open Access Journals (Sweden)

    Natalia N. Kruglova

    2013-04-01

    Full Text Available The periodization of wheat embryogenesis on the base of anatomy-morphological and temporal criterions has been proposed. The stages of non-differentiated embryo, embryo differentiation and differentiated embryo were described.

  5. The Cognitive Abilities Scale--Second Edition Preschool Form: Studies of Concurrent Criterion-Related, Construct, and Predictive Criterion-Related Validity

    Science.gov (United States)

    Swanson, Jennifer R.; Bradley-Johnson, Sharon; Johnson, C. Merle; O'Dell, Anna Rubenaker

    2009-01-01

    Three studies examine the validity of the Preschool Form of the Cognitive Abilities Scale--Second Edition (CAS-2). Significant high concurrent criterion-related validity correlations, corrected for restricted range, are found between the CAS-2 and the Detroit Test of Learning Ability--Primary: Third Edition for 26 three-year-olds (r[subscript c] =…

  6. Multiaxial fatigue criterion based on parameters from torsion and axial S-N curve

    Directory of Open Access Journals (Sweden)

    M. Margetin

    2016-07-01

    Full Text Available Multiaxial high cycle fatigue is a topic that concerns nearly all industrial domains. In recent years, a great deal of recommendations how to address problems with multiaxial fatigue life time estimation have been made and a huge progress in the field has been achieved. Until now, however, no universal criterion for multiaxial fatigue has been proposed. Addressing this situation, this paper offers a design of a new multiaxial criterion for high cycle fatigue. This criterion is based on critical plane search. Damage parameter consists of a combination of normal and shear stresses on a critical plane (which is a plane with maximal shear stress amplitude. Material parameters used in proposed criterion are obtained from torsion and axial S-N curves. Proposed criterion correctly calculates life time for boundary loading condition (pure torsion and pure axial loading. Application of proposed model is demonstrated on biaxial loading and the results are verified with testing program using specimens made from S355 steel. Fatigue material parameters for proposed criterion and multiple sets of data for different combination of axial and torsional loading have been obtained during the experiment.

  7. Shrinkage Porosity Criterion and Its Application to A 5.5 Ton Steel Ingot

    Directory of Open Access Journals (Sweden)

    Zhang C.

    2016-06-01

    Full Text Available In order to predict the distribution of shrinkage porosity in steel ingot efficiently and accurately, a criterion R√L and a method to obtain its threshold value were proposed. The criterion R√L was derived based on the solidification characteristics of steel ingot and pressure gradient in the mushy zone, in which the physical properties, the thermal parameters, the structure of the mushy zone and the secondary dendrite arm spacing were all taken into consideration. The threshold value of the criterion R√L was obtained with combination of numerical simulation of ingot solidification and total solidification shrinkage rate. Prediction of the shrinkage porosity in a 5.5 ton ingot of 2Cr13 steel with criterion R√L>0.21 m · °C1/2 · s−3/2 agreed well with the results of experimental sectioning. Based on this criterion, optimization of the ingot was carried out by decreasing the height-to-diameter ratio and increasing the taper, which successfully eliminated the centreline porosity and further proved the applicability of this criterion.

  8. Linear transformation based orthotropic shear ductile fracture criterion for lightweight metals

    Science.gov (United States)

    Lou, Yanshan; Yoon, Jeong Whan

    2017-10-01

    Accurate modelling of orthotropic ductile fracture is key to carry out reliable numerical prediction of rupture in plastic deformation of lightweight metals, such as ultra high strength steel, aluminum alloys, titanium alloys and magnesium alloys. Experiments are conducted for an aluminum alloy in shear, uniaxial tension, plane strain tension along rolling direction, diagonal direction and transverse direction as well as the balanced biaxial tension of the Nakajima test. Loading processes are recorded and fracture strain is measured by analysis of deformation with digital image correlation. Fracture behavior is modelled by a shear ductile fracture criterion of DF2016 along different loading directions. It is observed that anisotropy in ductile fracture cannot be correctly described by an isotropic ductile fracture criterion. Thus, an anisotropic ductile fracture criterion is proposed from a shear ductile fracture criterion of DF2014 based on linear transformation of the plastic strain vector into an isotropic equivalent damage strain vector. The anisotropic ductile fracture criterion is applied to model orthotropic fracture strain in shear, uniaxial tension and plane strain tension. The predicted anisotropy in ductile fracture is compared with experimental results for the verification of its accuracy. The comparison indicates that the proposed anisotropic ductile fracture criterion accurately models orthotropic ductile fracture in various loading conditions in shear, uniaxial tension and plane strain tension.

  9. A new repair criterion for steam generator tubes with axial cracks based on probabilistic integrity assessment

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Hyun-Su; Oh, Chang-Kyun [KEPCO Engineering and Construction Company, Inc., 269, Hyeoksin-ro, Gimcheon, Gyeongsangbuk-do 39660 (Korea, Republic of); Chang, Yoon-Suk, E-mail: yschang@khu.ac.kr [Department of Nuclear Engineering, College of Engineering, Kyung Hee University, 1732 Deokyoungdaero, Giheung, Yongin, Gyeonggi 446-701 (Korea, Republic of)

    2017-03-15

    Highlights: • Probabilistic assessment was performed for axially cracked steam generator tubes. • The threshold crack sizes were determined based on burst pressures of the tubes. • A new repair criterion was suggested as a function of operation time. - Abstract: Steam generator is one of the major components in a nuclear power plant, and it consists of thousands of thin-walled tubes. The operating record of the steam generators has indicated that a number of axial cracks due to stress corrosion have been frequently detected in the tubes. Since the tubes are closely related to the safety and also the efficiency of a nuclear power plant, an establishment of the appropriate repair criterion for the defected tubes and its applications are necessary. The objective of this paper is to develop an accurate repair criterion for the tubes with axial cracks. To do this, a thorough review is performed on the key parameters affecting the tube integrity, and then the probabilistic integrity assessment is carried out by considering the various uncertainties. In addition, the sizes of critical crack are determined by comparing the burst pressure of the cracked tube with the required performance criterion. Based on this result, the new repair criterion for the axially cracked tubes is defined from the reasonably conservative value such that the required performance criterion in terms of the burst pressure is able to be met during the next operating period.

  10. Failure Study of Composite Materials by the Yeh-Stratton Criterion

    Science.gov (United States)

    Yeh, Hsien-Yang; Richards, W. Lance

    1997-01-01

    The newly developed Yeh-Stratton (Y-S) Strength Criterion was used to study the failure of composite materials with central holes and normal cracks. To evaluate the interaction parameters for the Y-S failure theory, it is necessary to perform several biaxial loading tests. However, it is indisputable that the inhomogeneous and anisotropic nature of composite materials have made their own contribution to the complication of the biaxial testing problem. To avoid the difficulties of performing many biaxial tests and still consider the effects of the interaction term in the Y-S Criterion, a simple modification of the Y-S Criterion was developed. The preliminary predictions by the modified Y-S Criterion were relatively conservative compared to the testing data. Thus, the modified Y-S Criterion could be used as a design tool. To further understand the composite failure problem, an investigation of the damage zone in front of the crack tip coupled with the Y-S Criterion is imperative.

  11. Relationships between Myers-Briggs type indicator measure of psychological type and neo measure of big five personality factors in Polish University students: a preliminary cross-cultural comparison.

    Science.gov (United States)

    Tobacyk, Jerome J; Livingston, Mary M; Robbins, James E

    2008-10-01

    English-language versions of the Myers-Briggs Type Indicator (Form G) measure of psychological type and the NEO-FFI measure of the Big Five personality factors were completed by 57 Polish university students fluent in the English language. The pattern of correlations between MBTI and NEO-FFI scales for the Polish sample was compared to the pattern of correlations for measures of these same constructs reported for Americans. Four of the five significant relationships between MBTI and NEO-FFI scales reported in the American sample were also recorded in the Polish sample: MBTI Extraversion-Introversion with NEO Extraversion, MBTI Sensing-Intuition and MBTI Judging-Perceiving with NEO-Openness, and MBTI Judging-Perceiving with NEO Conscientiousness. Pending replication with a larger, more representative sample, this preliminary study supports the validity of psychological type in Polish society.

  12. The danger of dangerousness: why we must remove the dangerousness criterion from our mental health acts.

    Science.gov (United States)

    Large, M M; Ryan, C J; Nielssen, O B; Hayes, R A

    2008-12-01

    The mental health legislation of most developed countries includes either a dangerousness criterion or an obligatory dangerousness criterion (ODC). A dangerousness criterion holds that mentally ill people may be given treatment without consent if they are deemed to be a risk to themselves or others. An ODC holds that mentally ill people may be given treatment without consent only if they are deemed to be a risk to themselves or others. This paper argues that the dangerousness criterion is unnecessary, unethical and, in the case of the ODC, potentially harmful to mentally ill people and to the rest of the community. We examine the history of the dangerousness criterion, and provide reasoned argument and empirical evidence in support of our position. Dangerousness criteria are not required to balance the perceived loss of autonomy arising from mental health legislation. Dangerousness criteria unfairly discriminate against the mentally ill, as they represent an unreasonable barrier to treatment without consent, and they spread the burden of risk that any mentally ill person might become violent across large numbers of mentally ill people who will never become violent. Mental health legislation that includes an ODC is associated with a longer duration of untreated psychosis, and probably contributes to a poorer prognosis and an increase risk of suicide and violence in patients in their first episode of psychosis. Dangerousness criteria should be removed from mental health legislation and be replaced by criteria that focus on a patient's capacity to refuse treatment.

  13. PTSD's risky behavior criterion: Relation with DSM-5 PTSD symptom clusters and psychopathology.

    Science.gov (United States)

    Contractor, Ateka A; Weiss, Nicole H; Dranger, Paula; Ruggero, Camilo; Armour, Cherie

    2017-06-01

    A new symptom criterion of reckless and self-destructive behaviors (E2) was recently added to posttraumatic stress disorder's (PTSD) diagnostic criteria in DSM-5, which is unsurprising given the well-established relation between PTSD and risky behaviors. Researchers have questioned the significance and incremental validity of this symptom criterion within PTSD's symptomatology. Unprecedented to our knowledge, we aim to compare trauma-exposed groups differing on their endorsement status of the risky behavior symptom on several psychopathology constructs (PTSD, depression, distress tolerance, rumination, anger). The sample included 123 trauma-exposed participants seeking mental health treatment (M age=35.70; 68.30% female) who completed self-report questionnaires assessing PTSD symptoms, depression, rumination, distress tolerance, and anger. Results of independent samples t-tests indicated that participants who endorsed the E2 criterion at a clinically significant level reported significantly greater PTSD subscale severity; depression severity; rumination facets of repetitive thoughts, counterfactual thinking, and problem-focused thinking; and anger reactions; and significantly less absorption and regulation (distress tolerance facets) compared to participants who did not endorse the E2 criterion at a clinically significant level. Results indicate the utility of the E2 criterion in identifying trauma-exposed individual with greater posttraumatic distress, and emphasize the importance of targeting such behaviors in treatment. Copyright © 2017 Elsevier Ireland Ltd. All rights reserved.

  14. Avoiding false positives: zones of rarity, the threshold problem, and the DSM clinical significance criterion.

    Science.gov (United States)

    Cooper, Rachel V

    2013-11-01

    False positives arise when people without disorders are diagnosed as having disorders. Various approaches for avoiding false positives have been suggested. This review critically assesses the roles of zones of rarity, the threshold problem (the problem of determining the boundary of disorder in cases that shade into normality), and the Diagnostic and Statistical Manual of Mental Disorders (DSM) criterion that requires that a disorder cause clinically significant impairment or distress (the harm criterion). The lack of zones of rarity in much of psychiatry gives rise to the threshold problem. The DSM harm criterion is frequently presented as offering a solution to the threshold problem. However, I argue that the harm criterion cannot offer a general solution to the threshold problem, as harm is not always correlated with the intensity and frequency of symptoms. Still, the harm criterion is essential to ensure that people who are merely different are not diagnosed as having a disorder. The threshold problem can be addressed by selecting symptom-based cut-off points to distinguish between disorder and normality. These cut-off points are frequently arbitrary in the sense that they often reflect no natural division between disorder and normal, but they may be more or less wisely chosen. Where possible, the thresholds should be set so that the advantages of diagnosis can be expected to outweigh the disadvantages.

  15. Covariance-Based Measurement Selection Criterion for Gaussian-Based Algorithms

    Directory of Open Access Journals (Sweden)

    Fernando A. Auat Cheein

    2013-01-01

    Full Text Available Process modeling by means of Gaussian-based algorithms often suffers from redundant information which usually increases the estimation computational complexity without significantly improving the estimation performance. In this article, a non-arbitrary measurement selection criterion for Gaussian-based algorithms is proposed. The measurement selection criterion is based on the determination of the most significant measurement from both an estimation convergence perspective and the covariance matrix associated with the measurement. The selection criterion is independent from the nature of the measured variable. This criterion is used in conjunction with three Gaussian-based algorithms: the EIF (Extended Information Filter, the EKF (Extended Kalman Filter and the UKF (Unscented Kalman Filter. Nevertheless, the measurement selection criterion shown herein can also be applied to other Gaussian-based algorithms. Although this work is focused on environment modeling, the results shown herein can be applied to other Gaussian-based algorithm implementations. Mathematical descriptions and implementation results that validate the proposal are also included in this work.

  16. Contribution of criterion A2 to PTSD screening in the presence of traumatic events.

    Science.gov (United States)

    Pereda, Noemí; Forero, Carlos G

    2012-10-01

    Criterion A2 according to the Diagnostic and Statistical Manual of Mental Disorders (4(th) ed.; DSM-IV; American Psychiatric Association [APA], 1994) for posttraumatic stress disorder (PTSD) aims to assess the individual's subjective appraisal of an event, but it has been claimed that it might not be sufficiently specific for diagnostic purposes. We analyse the contribution of Criterion A2 and DSM-IV criteria to detect PTSD for the most distressing life events experienced by our subjects. Young adults (N = 1,033) reported their most distressing life events, together with PTSD criteria (Criteria A2, B, C, D, E, and F). PTSD prevalence and criterion specificity and agreement with probable diagnoses were estimated. Our results indicate 80.30% of the individuals experienced traumatic events and met one or more PTSD criteria; 13.22% cases received a positive diagnosis of PTSD. Criterion A2 showed poor agreement with the final probable PTSD diagnosis (correlation with PTSD .13, specificity = .10); excluding it from PTSD diagnosis did not the change the estimated disorder prevalence significantly. Based on these findings it appears that Criterion A2 is scarcely specific and provides little information to confirm a probable PTSD case. Copyright © 2012 International Society for Traumatic Stress Studies.

  17. Relative blindsight arises from a criterion confound in metacontrast masking: implications for theories of consciousness.

    Science.gov (United States)

    Jannati, Ali; Di Lollo, Vincent

    2012-03-01

    Relative blindsight is said to occur when different levels of subjective awareness are obtained at equality of objective performance. Using metacontrast masking, Lau and Passingham (2006) reported relative blindsight in normal observers at the shorter of two stimulus-onset asynchronies (SOAs) between target and mask. Experiment 1 replicated the critical asymmetry in subjective awareness at equality of objective performance. We argue that this asymmetry cannot be regarded as evidence for relative blindsight because the observers' responses were based on different attributes of the stimuli (criterion contents) at the two SOAs. With an invariant criterion content (Experiment 2), there was no asymmetry in subjective awareness across the two SOAs even though objective performance was the same. Experiment 3 examined the effect of criterion level on estimates of relative blindsight. Collectively, the present results question whether metacontrast masking is a suitable paradigm for establishing relative blindsight. Implications for theories of consciousness are discussed. Copyright © 2011 Elsevier Inc. All rights reserved.

  18. On PID Controller Design by Combining Pole Placement Technique with Symmetrical Optimum Criterion

    Directory of Open Access Journals (Sweden)

    Viorel Nicolau

    2013-01-01

    Full Text Available In this paper, aspects of analytical design of PID controllers are studied, by combining pole placement technique with symmetrical optimum criterion. The proposed method is based on low-order plant model with pure integrator, and it can be used for both fast and slow processes. Starting from the desired closed-loop transfer function, which contains a second-order oscillating system and a lead-lag compensator, it is shown that the zero value depends on the real-pole value of closed-loop transfer function. In addition, there is only one pole value, which satisfies the assumptions of symmetrical optimum criterion imposed to open-loop transfer function. In these conditions, by combining the pole placement technique with symmetrical optimum criterion, the analytical expressions of the controller parameters can be simplified. For simulations, PID autopilot design for heading control problem of a conventional ship is considered.

  19. Conservative Allowables Determined by a Tsai-Hill Equivalent Criterion for Design of Satellite Composite Parts

    Science.gov (United States)

    Pommatau, Gilles

    2014-06-01

    The present paper deals with the industrial application, via a software developed by Thales Alenia Space, of a new failure criterion named "Tsai-Hill equivalent criterion" for composite structural parts of satellites. The first part of the paper briefly describes the main hypothesis and the possibilities in terms of failure analysis of the software. The second parts reminds the quadratic and conservative nature of the new failure criterion, already presented in ESA conference in a previous paper. The third part presents the statistical calculation possibilities of the software, and the associated sensitivity analysis, via results obtained on different composites. Then a methodology, proposed to customers and agencies, is presented with its limitations and advantages. It is then conclude that this methodology is an efficient industrial way to perform mechanical analysis on quasi-isotropic composite parts.

  20. A new multiobjective performance criterion used in PID tuning optimization algorithms.

    Science.gov (United States)

    Sahib, Mouayad A; Ahmed, Bestoun S

    2016-01-01

    In PID controller design, an optimization algorithm is commonly employed to search for the optimal controller parameters. The optimization algorithm is based on a specific performance criterion which is defined by an objective or cost function. To this end, different objective functions have been proposed in the literature to optimize the response of the controlled system. These functions include numerous weighted time and frequency domain variables. However, for an optimum desired response it is difficult to select the appropriate objective function or identify the best weight values required to optimize the PID controller design. This paper presents a new time domain performance criterion based on the multiobjective Pareto front solutions. The proposed objective function is tested in the PID controller design for an automatic voltage regulator system (AVR) application using particle swarm optimization algorithm. Simulation results show that the proposed performance criterion can highly improve the PID tuning optimization in comparison with traditional objective functions.

  1. Least mean square error difference minimum criterion for adaptive chaotic noise canceller

    Science.gov (United States)

    Zhang, Jia-Shu

    2007-02-01

    The least mean square error difference (LMS-ED) minimum criterion for an adaptive chaotic noise canceller is proposed in this paper. Different from traditional least mean square error minimum criterion in which the error is uncorrelated with the input vector, the proposed LMS-ED minimum criterion tries to minimize the correlation between the error difference and input vector difference. The novel adaptive LMS-ED algorithm is then derived to update the weights of adaptive noise canceller. A comparison between cancelling performances of adaptive least mean square (LMS), normalized LMS (NLMS) and proposed LMS-ED algorithms is simulated by using three kinds of chaotic noises. The simulation results clearly show that the proposed algorithm outperforms the LMS and NLMS algorithms in achieving small values of steady-state excess mean square error. Moreover, the computational complexity of the proposed LMS-ED algorithm is the same as that of the standard LMS algorithms.

  2. The Need of the Revision of Passenger Ships’ Stability Criterion on Account of Turning

    Directory of Open Access Journals (Sweden)

    Zbigniew Szozda

    2014-09-01

    Full Text Available The angle of heel on account of turning is one of the mandatory stability criteria for passenger ships. Formula used for calculations of this criterion contained in the International Code on Intact Stability [13] is criticized at present. Agendas of the Sub-committee on Ship Design and Construction (SDC for the first (2014 and the second (2015 sessions contain the item on revision of this criterion and corresponding regulation. The paper presents some shortcomings of the criterion. Turning tests of a freely maneuvering model of a passenger ship have been executed aiming at gathering data for the future discussion and its facilitation. The paper presents results of the tests together with preliminary conclusions that confirm the need of the revision of the regulation and put forward concerns on application of such values as initial metacentric height (GMo and righting lever curve (GZ(? calculated for a ship laying still for calculation of a ship’s heel caused by turn.

  3. Possible deviations from Griffith’s criterion in shallow slabs, and consequences on slab avalanche release

    Directory of Open Access Journals (Sweden)

    F. Louchet

    2002-01-01

    Full Text Available Possible reasons for deviations from Griffith’s criterion in slab avalanche triggerings are examined. In the case of a major basal crack, we show (i that the usual form of Griffith’s criterion is valid if elastic energy is stored in a shallow and hard slab only, and (ii that rapid healing of broken ice bonds may lead to shear toughnesses larger than expected from tensile toughness experiments. In the case of avalanches resulting from failure of multi-cracked weak layers, where a simple Griffith’s criterion cannot be applied, frequency/size plots obtained from discrete elements and cellular automata simulations are shown to obey scale invariant power law distributions. These findings are confirmed by both frequency/acoustic emission duration and frequency/size plots obtained from field data, suggesting that avalanche triggerings may be described using the formalism of critical phenomena.

  4. The role of criterion A2 in the DSM-IV diagnosis of posttraumatic stress disorder.

    Science.gov (United States)

    Karam, Elie George; Andrews, Gavin; Bromet, Evelyn; Petukhova, Maria; Ruscio, Ayelet Meron; Salamoun, Mariana; Sampson, Nancy; Stein, Dan J; Alonso, Jordi; Andrade, Laura Helena; Angermeyer, Matthias; Demyttenaere, Koen; de Girolamo, Giovanni; de Graaf, Ron; Florescu, Silvia; Gureje, Oye; Kaminer, Debra; Kotov, Roman; Lee, Sing; Lépine, Jean-Pierre; Medina-Mora, Maria Elena; Oakley Browne, Mark A; Posada-Villa, José; Sagar, Rajesh; Shalev, Arieh Y; Takeshima, Tadashi; Tomov, Toma; Kessler, Ronald C

    2010-09-01

    Controversy exists about the utility of DSM-IV posttraumatic stress disorder (PTSD) criterion A2 (A2): that exposure to a potentially traumatic experience (PTE; PTSD criterion A1) is accompanied by intense fear, helplessness, or horror. Lifetime DSM-IV PTSD was assessed with the Composite International Diagnostic Interview in community surveys of 52,826 respondents across 21 countries in the World Mental Health Surveys. Of 28,490 representative PTEs reported by respondents, 37.6% met criterion A2, a proportion higher than the proportions meeting other criteria (B-F; 5.4%-9.6%). Conditional prevalence of meeting all other criteria for a diagnosis of PTSD given a PTE was significantly higher in the presence (9.7%) than absence (.1%) of A2. However, as only 1.4% of respondents who met all other criteria failed A2, the estimated prevalence of PTSD increased only slightly (from 3.64% to 3.69%) when A2 was not required for diagnosis. Posttraumatic stress disorder with or without criterion A2 did not differ in persistence or predicted consequences (subsequent suicidal ideation or secondary disorders) depending on presence-absence of A2. Furthermore, as A2 was by far the most commonly reported symptom of PTSD, initial assessment of A2 would be much less efficient than screening other criteria in quickly ruling out a large proportion of noncases. Removal of A2 from the DSM-IV criterion set would reduce the complexity of diagnosing PTSD, while not substantially increasing the number of people who qualify for diagnosis. Criterion A2 should consequently be reconceptualized as a risk factor for PTSD rather than as a diagnostic requirement. Copyright 2010 Society of Biological Psychiatry. Published by Elsevier Inc. All rights reserved.

  5. Adiabaticity criterion and the shortest adiabatic mode transformer in a coupled-waveguide system.

    Science.gov (United States)

    Sun, Xiankai; Liu, Hsi-Chun; Yariv, Amnon

    2009-02-01

    By analyzing the propagating behavior of the supermodes in a coupled-waveguide system, we have derived a universal criterion for designing adiabatic mode transformers. The criterion relates epsilon, the fraction of power scattered into the unwanted mode, to waveguide design parameters and gives the shortest possible length of an adiabatic mode transformer, which is approximately 2/piepsilon1/2 times the distance of maximal power transfer between the waveguides. The results from numerical calculations based on a transfer-matrix formalism support this theory very well.

  6. Exploring DSM-5 criterion A in Acute Stress Disorder symptoms following natural disaster.

    Science.gov (United States)

    Lavenda, Osnat; Grossman, Ephraim S; Ben-Ezra, Menachem; Hoffman, Yaakov

    2017-10-01

    The present study examines the DSM-5 Acute Stress Disorder (ASD) diagnostic criteria of exposure, in the context of a natural disaster. The study is based on the reports of 1001 Filipinos following the aftermath of super typhoon Haiyan in 2013. Participants reported exposure to injury, psychological distress and ASD symptoms. Findings indicated the association of criterion A with the prevalence of meeting all other ASD diagnostic criteria and high psychological distress. The diagnostic properties of Criterion A are discussed. Copyright © 2017 Elsevier B.V. All rights reserved.

  7. A Fortran 90 Program for the Generalized Order-Restricted Information Criterion

    OpenAIRE

    Kuiper, Rebecca M.; Herbert Hoijtink

    2013-01-01

    The generalized order-restricted information criterion (GORIC) is a generalization of the Akaike information criterion such that it can evaluate hypotheses that take on specific, but widely applicable, forms (namely, closed convex cones) for multivariate normal linear models. It can examine the traditional hypotheses H0: β1,1 = … = βt,k and Hu: β1,1, …, βt,k and hypotheses containing simple order restrictions Hm: β1,1 ≥ … ≥ βt,k, where any "≥" may be replaced by "=" and m is the model/hypothe...

  8. Gregory research beliefs scale: discriminant construct, concurrent criterion, and known-groups validity.

    Science.gov (United States)

    Gregory, Virgil L

    2012-01-01

    The purpose of the author in this study was to evaluate the discriminant construct, concurrent criterion, and known-groups validity of the Gregory Research Beliefs Scale (GRBS). Data was collected from masters and bachelors level social work students via online and traditional classroom settings. The Gregory Research Beliefs Scale's discriminant construct validity was supported via principal component and confirmatory factor analysis. A correlation coefficient provided some evidence for the concurrent criterion validity. The Gregory Research Beliefs Scale's known-groups validity was not supported. Strengths, limitations, future research, and implications for evidence-based social work practice are discussed.

  9. Analyses of S-Box in Image Encryption Applications Based on Fuzzy Decision Making Criterion

    Science.gov (United States)

    Rehman, Inayatur; Shah, Tariq; Hussain, Iqtadar

    2014-06-01

    In this manuscript, we put forward a standard based on fuzzy decision making criterion to examine the current substitution boxes and study their strengths and weaknesses in order to decide their appropriateness in image encryption applications. The proposed standard utilizes the results of correlation analysis, entropy analysis, contrast analysis, homogeneity analysis, energy analysis, and mean of absolute deviation analysis. These analyses are applied to well-known substitution boxes. The outcome of these analyses are additional observed and a fuzzy soft set decision making criterion is used to decide the suitability of an S-box to image encryption applications.

  10. Formation law and criterion of nebulous macroscopic segregation in ZL205A alloy castings

    Directory of Open Access Journals (Sweden)

    Li Yusheng

    2008-02-01

    Full Text Available The appearance of macroscopic segregation in ZL205A alloy castings bears a super resemblance to the appearance of shrinkage porosity, and the chemical composition of the segregation is Al2Cu whose microstructure is in the form of dentrite or skeleton crystal. According to the characteristic of nebulous segregation, the formation process could be divided into two steps by the eutectic temperature of Al2Cu. Then a criterion for each of the two steps is brought forward on the basis of the shrinkage porosity criterion of low pressure casting.

  11. Criterion-Related Validity of Sit-and-Reach Tests for Estimating Hamstring and Lumbar Extensibility: a Meta-Analysis

    OpenAIRE

    Mayorga-Vega, Daniel; Merino-Marban, Rafael; Viciana, Jesús

    2014-01-01

    The main purpose of the present meta-analysis was to examine the scientific literature on the criterion-related validity of sit-and-reach tests for estimating hamstring and lumbar extensibility. For this purpose relevant studies were searched from seven electronic databases dated up through December 2012. Primary outcomes of criterion-related validity were Pearson´s zero-order correlation coefficients (r) between sit-and-reach tests and hamstrings and/or lumbar extensibility criterion measure...

  12. A criterion based on an information theoretic measure for goodness of fit between classifier and data base. [in pattern recognition

    Science.gov (United States)

    Eigen, D. J.; Davida, G. I.; Northouse, R. A.

    1974-01-01

    A criterion for characterizing an iteratively trained classifier is presented. The criterion is based on an information theoretic measure that is developed from modeling classifier training iterations as a set of cascaded channels. The criterion is formulated as a figure of merit and as a performance index to check the appropriateness of application of the characterized classifier to an unknown data base and for implementing classifier updates and data selection, respectively.

  13. A criterion based on an information theoretic measure for goodness of fit between classifier and data base

    Science.gov (United States)

    Eigen, D. J.; Davida, G. I.; Northouse, R. A.

    1973-01-01

    A criterion for characterizing an iteratively trained classifier is presented. The criterion is based on an information theoretic measure that is developed from modeling classifier training iterations as a set of cascaded channels. The criterion is formulated as a figure of merit and as a performance index to check the appropriateness of application of the characterized classifier to an unknown data base and for implementing classifier updates and data selection respectively.

  14. fracture criterion

    Indian Academy of Sciences (India)

    Fracture in metallic glasses. What are the connections between nano- and micro- mechanisms and toughness? Metallic glasses are schizophrenic in the fracture sense. PDF Create! 5 Trial www.nuance.com ...

  15. On the geometry of the Zel'manov-Grishchuk cosmological homogeneity criterion

    Science.gov (United States)

    MacCallum, M. A. H.; Spero, A.; Szafron, D. A.

    1982-01-01

    The geometrical interpretation of the ``differential homogeneity'' criterion of Zel'manov and Grishchuk is discussed. It is related to the existence of spatial groups of motion, spatial conformal flatness, the absence of a ``magnetic part'' of the Weyl tensor, and hypersurface-orthogonal motion of fundamental observers who see no relative energy transport.

  16. Evaluation of Self-Perceptions of Creativity: Is It a Useful Criterion?

    Science.gov (United States)

    Reiter-Palmon, Roni; Robinson-Morral, Erika J.; Kaufman, James C.; Santo, Jonathan B.

    2012-01-01

    Self-evaluations or self-perceptions of creativity have been used in the past both as predictors of creative performance and as criteria. Four measures utilizing self-perceptions of creativity were assessed for their usefulness as criterion measures of creativity. Analyses provided evidence of domain specificity of self-perceptions. The scales…

  17. Reviewing Employee Turnover: Focusing on Proximal Withdrawal States and an Expanded Criterion

    Science.gov (United States)

    Hom, Peter W.; Mitchell, Terence R.; Lee, Thomas W.; Griffeth, Rodger W.

    2012-01-01

    We reconceptualize employee turnover to promote researchers' understanding and prediction of why employees quit or stay in employing institutions. A literature review identifies shortcomings with prevailing turnover dimensions. In response, we expand the conceptual domain of the turnover criterion to include multiple types of turnover (notably,…

  18. easyCBM® Reading Criterion Related Validity Evidence: Grades 2-5. Technical Report #1310

    Science.gov (United States)

    Lai, Cheng-Fei; Alonzo, Julie; Tindal, Gerald

    2013-01-01

    In this technical report, we present the results of a study to gather criterion-related evidence for Grade 2-5 easyCBM® reading measures. We used correlations to examine the relation between the easyCBM® measures and other published measures with known reliability and validity evidence, including the Gates-MacGinitie Reading Tests and the Dynamic…

  19. Person fit and criterion-related validity: an extension of the Schmitt, Cortina, and Whitney study

    NARCIS (Netherlands)

    Meijer, R.R.

    1997-01-01

    The effect on criterion-related validity of nonfitting response vectors (NRVs) on a predictor test was investigated. Using simulated data, it was shown that there was a substantial decrease in validity when the type of misfit was severe (i.e., guessing the correct answers to all test items), when

  20. The Criterion-Related Validity of a Computer-Based Approach for Scoring Concept Maps

    Science.gov (United States)

    Clariana, Roy B.; Koul, Ravinder; Salehi, Roya

    2006-01-01

    This investigation seeks to confirm a computer-based approach that can be used to score concept maps (Poindexter & Clariana, 2004) and then describes the concurrent criterion-related validity of these scores. Participants enrolled in two graduate courses (n=24) were asked to read about and research online the structure and function of the heart…

  1. easyCBM® Reading Criterion Related Validity Evidence: Grades K-1. Technical Report #1309

    Science.gov (United States)

    Lai, Cheng-Fei; Alonzo, Julie; Tindal, Gerald

    2013-01-01

    In this technical report, we present the results of a study to gather criterion-related evidence for Grade K-1 easyCBM® reading measures. We used correlations to examine the relation between the easyCBM® measures and other published measures with known reliability and validity evidence, including the Dynamic Indicators of Basic Early Literacy…

  2. Criterion-related validity op Dutch police-selection measures and differences between ethnic groups.

    NARCIS (Netherlands)

    L.A.L. de Meijer (Lonneke); M.Ph. Born (Marise); G. Terlouw (Gert); H.T. van der Molen (Henk)

    2008-01-01

    textabstractThis study investigated the criterion-related validity of cognitive ability as well as non-cognitive ability measures and differences between ethnic majority (N = 2,365) and minority applicants (N = 682) in Dutch police officer selection. Findings confirmed the relatively low predictive

  3. An Adaptive Pruning Algorithm for the Discrete L-Curve Criterion

    DEFF Research Database (Denmark)

    Hansen, Per Christian; Jensen, Toke Koldborg; Rodriguez, Giuseppe

    2004-01-01

    We describe a robust and adaptive implementation of the L-curve criterion, i.e., for locating the corner of a discrete L-curve consisting of a log-log plot of corresponding residual and solution norms of regularized solutions from a method with a discrete regularization parameter (such as truncated...

  4. An adaptive pruning algorithm for the discrete L-curve criterion

    DEFF Research Database (Denmark)

    Hansen, Per Christian; Jensen, Toke Koldborg; Rodriguez, Giuseppe

    2007-01-01

    We describe a robust and adaptive implementation of the L-curve criterion, i.e., for locating the corner of a discrete L-curve consisting of a log-log plot of corresponding residual and solution norms of regularized solutions from a method with a discrete regularization parameter (such as truncated...

  5. Higher order criterion for the nonexistence of formal first integral for nonlinear systems

    Directory of Open Access Journals (Sweden)

    Zhiguo Xu

    2017-11-01

    Full Text Available The main purpose of this article is to find a criterion for the nonexistence of formal first integrals for nonlinear systems under general resonance. An algorithm illustrates an application to a class of generalized Lokta-Volterra systems. Our result generalize the classical Poincare's nonintegrability theorem and the existing results in the literature.

  6. Changing the criterion for memory conformity in free recall and recognition.

    Science.gov (United States)

    Wright, Daniel B; Gabbert, Fiona; Memon, Amina; London, Kamala

    2008-02-01

    People's responses during memory studies are affected by what other people say. This memory conformity effect has been shown in both free recall and recognition. Here we examine whether accurate, inaccurate, and suggested answers are affected similarly when the response criterion is varied. In the first study, participants saw four pictures of detailed scenes and then discussed the content of these scenes with another participant who saw the same scenes, but with a couple of details changed. Participants were either told to recall everything they could and not to worry about making mistakes (lenient), or only to recall items if they were sure that they were accurate (strict). The strict instructions reduced the amount of inaccurate information reported that the other person suggested, but also reduced the number of accurate details recalled. In the second study, participants were shown a large set of faces and then their memory recognition was tested with a confederate on these and fillers. Here also, the criterion manipulation shifted both accurate and inaccurate responses, and those suggested by the confederate. The results are largely consistent with a shift in response criterion affecting accurate, inaccurate, and suggested information. In addition we varied the level of secrecy in the participants' responses. The effects of secrecy were complex and depended on the level of response criterion. Implications for interviewing eyewitnesses and line-ups are discussed.

  7. Tightening the Dutch coffee shop policy: Evaluation of the private club and the residence criterion

    NARCIS (Netherlands)

    van Ooyen-Houben, M.M.J.; Bieleman, B.; Korf, D.J.

    2016-01-01

    Background The Dutch coffee shop policy was tightened in 2012. Two additional criteria that coffee shops must adhere to in order for them to be tolerated came into force: the private club and the residence criterion. Coffee shops were only permitted to give access to members and only residents of

  8. An Empiricist Criterion of Meaning | Benétreau-Dupin | South African ...

    African Journals Online (AJOL)

    We can see that the former empiricist criterion of meaning only implies for theoretical terms not to be definable in terms of observable, but that their use put a constraint ... It has faced important logical objections, which have mostly been addressed with respect to the problem of the ontological commitment of the second-order ...

  9. A Regularity Criterion for the 3D Incompressible Magnetohydrodynamics Equations in the Multiplier Spaces

    Directory of Open Access Journals (Sweden)

    Chunhong Tian

    2017-01-01

    Full Text Available We are concerned with the regularity criterion for weak solutions to the 3D incompressible MHD equations in this paper. We show that if some partial derivatives of the velocity components and magnetic components belong to the multiplier spaces, then the solution actually is smooth on (0,T.

  10. Criterion-Referenced Tests in Science: An Investigation of Reliability, Validity, and Standards-Setting.

    Science.gov (United States)

    Lang, Harry G.

    1982-01-01

    Reliability, validity, and standards-setting procedure for a criterion-referenced test (Test of Metric Skills) were examined for use in science curricula. Results indicate a number of factors influencing test reliability/validity and that science teachers need to be aware of these factors to enhance accuracy of their judgments. (Author/JN)

  11. On the regularity criterion of weak solutions for the 3D MHD equations

    Science.gov (United States)

    Gala, Sadek; Ragusa, Maria Alessandra

    2017-12-01

    The paper deals with the 3D incompressible MHD equations and aims at improving a regularity criterion in terms of the horizontal gradient of velocity and magnetic field. It is proved that the weak solution ( u, b) becomes regular provided that ( \

  12. Responder Status Criterion for Stepped Care Trauma-Focused Cognitive Behavioral Therapy for Young Children

    Science.gov (United States)

    Salloum, Alison; Scheeringa, Michael S.; Cohen, Judith A.; Storch, Eric A.

    2015-01-01

    Background: In order to develop Stepped Care trauma-focused cognitive behavioral therapy (TF-CBT), a definition of early response/non-response is needed to guide decisions about the need for subsequent treatment. Objective: The purpose of this article is to (1) establish criterion for defining an early indicator of response/non-response to the…

  13. Using Exit Charts to Develop an Early Stopping Criterion for Turbo Decoding

    NARCIS (Netherlands)

    Potman, J.; Hoeksema, F.W.; Slump, Cornelis H.

    2004-01-01

    Early stopping criteria are used to determine when additional decoder iterations result in little or no improvement in the bit- error-rate (BER) at the output of a Turbo decoder. This paper proposes a stopping criterion based on Extrinsic Information Transfer (EXIT) charts. The generation and

  14. Effects on Scale Linking of Different Definitions of Criterion Functions for the IRT Characteristic Curve Methods

    Science.gov (United States)

    Kim, Seonghoon; Kolen, Michael J.

    2007-01-01

    Under item response theory, the characteristic curve methods (Haebara and Stocking-Lord methods) are used to link two ability scales from separate calibrations. The linking methods use their respective criterion functions that can be defined differently according to the symmetry- and distribution-related schemes. The symmetry-related scheme…

  15. Statistical surrogate model based sampling criterion for stochastic global optimization of problems with constraints

    Energy Technology Data Exchange (ETDEWEB)

    Cho, Su Gil; Jang, Jun Yong; Kim, Ji Hoon; Lee, Tae Hee [Hanyang University, Seoul (Korea, Republic of); Lee, Min Uk [Romax Technology Ltd., Seoul (Korea, Republic of); Choi, Jong Su; Hong, Sup [Korea Research Institute of Ships and Ocean Engineering, Daejeon (Korea, Republic of)

    2015-04-15

    Sequential surrogate model-based global optimization algorithms, such as super-EGO, have been developed to increase the efficiency of commonly used global optimization technique as well as to ensure the accuracy of optimization. However, earlier studies have drawbacks because there are three phases in the optimization loop and empirical parameters. We propose a united sampling criterion to simplify the algorithm and to achieve the global optimum of problems with constraints without any empirical parameters. It is able to select the points located in a feasible region with high model uncertainty as well as the points along the boundary of constraint at the lowest objective value. The mean squared error determines which criterion is more dominant among the infill sampling criterion and boundary sampling criterion. Also, the method guarantees the accuracy of the surrogate model because the sample points are not located within extremely small regions like super-EGO. The performance of the proposed method, such as the solvability of a problem, convergence properties, and efficiency, are validated through nonlinear numerical examples with disconnected feasible regions.

  16. Modelling and simulation of A-segregates in steel castings using a thermal criterion function

    DEFF Research Database (Denmark)

    Kotas, Petr; Hattel, Jesper Henri

    2012-01-01

    simulation software package. It is then used for predicting A segregates inside a large steel casting, i.e. a forging ram. In part I, experimental data obtained from a foundry serve to validate the given criterion and to evaluate the critical value for A segregate initiation for one alloy composition...

  17. Discriminative and Criterion Validity of the Autism Spectrum Identity Scale (ASIS)

    Science.gov (United States)

    McDonald, T. A. M.

    2017-01-01

    Individuals on the autism spectrum face stigma that can influence identity development. Previous research on the 22-item Autism Spectrum Identity Scale (ASIS) reported a four-factor structure with strong split-sample cross-validation and good internal consistency. This study reports the discriminative and criterion validity of the ASIS with other…

  18. Subject Abilities to Use Metric MDS: Effects of Varying the Criterion Pair.

    Science.gov (United States)

    Gordon, Thomas F.

    Nine independent groups of students totaling 863 subjects made a metric judgment of 13 concepts (TV programs) in a study to assess the selection of the best criterion pair in a metric multidimensional scaling (MDS) task. Using the GALILEO metric MDS program, judgments were scaled and plotted in three-dimensional space. The three hypotheses were…

  19. Wearable monitors criterion validity for energy expenditure in sedentary and light activities

    Directory of Open Access Journals (Sweden)

    Florez-Pregonero Alberto

    2017-03-01

    Conclusion: None of the WMs tested in this study were equivalent with the criterion measure (VO2 in estimating sedentary-to-light activities; however, the activPAL had greater overall accuracy in measuring SB and LPA than did the ActiGraph and SenseWear 2 monitors.

  20. Criterion II: Indicators for conservation and maintenance of plant and animal resources on rangelands (Chapter 3)

    Science.gov (United States)

    Linda A. Joyce; William Fox; Paul Geissler; Rodney Heitschmidt; Lori Hidinger; Duncan Patten; John Spence; Laurence L. Strong; Robert Unnasch; Robert A. Washington-Allen

    2010-01-01

    Five criteria were established by the Sustainable Rangelands Roundtable to be used to assess rangeland sustainability on a national scale. One of those criteria is the conservation and maintenance of plant and animal resources. Within this criterion, 10 indicators were developed through the expert opinions of rangeland scientists, rangeland management agency personnel...

  1. A risk-averse competitive newsvendor problem under the CVaR criterion

    NARCIS (Netherlands)

    Wu, Meng; Zhu, Stuart X.; Teunter, Ruud H.

    2014-01-01

    We study a risk-averse newsvendor problem with quantity competition and price competition. Under the Conditional Value-at-Risk (CVaR) criterion, we characterize the optimal quantity and pricing decisions under both quantity and price competition. For quantity competition, we consider two demand

  2. A convenient criterion under which Z{sub 2}-graded operators are Hamiltonian

    Energy Technology Data Exchange (ETDEWEB)

    Hussin, Veronique [Departement de Mathematiques et de Statistique, Universite de Montreal, C.P. 6128, succ. Centre-ville, Montreal, Quebec H3C 3J7 (Canada); Kiselev, Arthemy V, E-mail: hussin@dms.umontreal.ca, E-mail: A.V.Kiselev@rug.nl [Mathematical Institute, University of Utrecht, PO Box 80.010, 3508 TA Utrecht (Netherlands)

    2011-03-01

    We formulate a simple and convenient criterion under which skew-adjoint Z{sub 2}-graded total differential operators are Hamiltonian, provided that their images are closed under commutation in the Lie algebras of evolutionary vector fields on the infinite jet spaces for vector bundles over smooth manifolds.

  3. The Weierstrass Criterion and the LEMAÎTRE-TOLMAN-BONDI Models with Cosmological Constant Λ

    Science.gov (United States)

    Bochicchio, Ivana; Capozziello, Salvatore; Laserra, Ettore

    We analyze Lemaitre-Tolman-Bondi models in presence of the cosmological constant \\Lambda through the classical Weierstrass criterion. Precisely, we show that the Weierstrass approach allows us to classify the dynamics of these inhomogeneous spherically symmetric Universes taking into account their relationship with the sign of \\Lambda.

  4. A Case for Transforming the Criterion of a Predictive Validity Study

    Science.gov (United States)

    Patterson, Brian F.; Kobrin, Jennifer L.

    2011-01-01

    This study presents a case for applying a transformation (Box and Cox, 1964) of the criterion used in predictive validity studies. The goals of the transformation were to better meet the assumptions of the linear regression model and to reduce the residual variance of fitted (i.e., predicted) values. Using data for the 2008 cohort of first-time,…

  5. A relaxed criterion for contraction theory: application to an underwater vehicle observer

    DEFF Research Database (Denmark)

    Jouffroy, Jerome

    the Jacobian is not uniformly negative definite but fulfils some weaker conditions. Intended as an illustrative example, a nonlinear underwater vehicle observer, which Jacobian is not uniformly negative definite, is presented and proven to be exponentially convergent using the new criterion....

  6. A new criterion for assessing discriminant validity in variance-based structural equation modeling

    NARCIS (Netherlands)

    Henseler, Jörg; Ringle, Christian M.; Sarstedt, Marko

    2015-01-01

    Discriminant validity assessment has become a generally accepted prerequisite for analyzing relationships between latent variables. For variance-based structural equation modeling, such as partial least squares, the Fornell-Larcker criterion and the examination of cross-loadings are the dominant

  7. Validation of a Criterion Referenced Test for Young Handicapped Children: PIPER.

    Science.gov (United States)

    Strum, Irene; Shapiro, Madelaine

    The purpose of this study was to validate the Prescriptive Instructional Program for Educational Readiness (PIPER) for utilization as a criterion referenced test (CRT) among learning disabled children. The program consisted of behavioral objectives and diagnostic and/or mastery tasks and activities for each objective in the area of gross motor…

  8. Predicting ethnic and racial discrimination: a meta-analysis of IAT criterion studies.

    Science.gov (United States)

    Oswald, Frederick L; Mitchell, Gregory; Blanton, Hart; Jaccard, James; Tetlock, Philip E

    2013-08-01

    This article reports a meta-analysis of studies examining the predictive validity of the Implicit Association Test (IAT) and explicit measures of bias for a wide range of criterion measures of discrimination. The meta-analysis estimates the heterogeneity of effects within and across 2 domains of intergroup bias (interracial and interethnic), 6 criterion categories (interpersonal behavior, person perception, policy preference, microbehavior, response time, and brain activity), 2 versions of the IAT (stereotype and attitude IATs), 3 strategies for measuring explicit bias (feeling thermometers, multi-item explicit measures such as the Modern Racism Scale, and ad hoc measures of intergroup attitudes and stereotypes), and 4 criterion-scoring methods (computed majority-minority difference scores, relative majority-minority ratings, minority-only ratings, and majority-only ratings). IATs were poor predictors of every criterion category other than brain activity, and the IATs performed no better than simple explicit measures. These results have important implications for the construct validity of IATs, for competing theories of prejudice and attitude-behavior relations, and for measuring and modeling prejudice and discrimination.

  9. Using the brain criterion in organ donation after the circulatory determination of death.

    Science.gov (United States)

    Dalle Ave, Anne L; Bernat, James L

    2016-06-01

    The UK, France, and Switzerland determine death using the brain criterion even in organ donation after the circulatory determination of death (DCDD), in which the United States and Canada use the circulatory-respiratory criterion. In our analysis of the scientific validity of the brain criterion in DCDD, we concluded that although it may be attractive in theory because it conceptualizes death as a unitary phenomenon, its use in practice is invalid. The preconditions (ie, the absence of reversible causes, such as toxic or metabolic disorders) for determining brain death cannot be met in DCDD. Thus, although brain death tests prove the cessation of tested brain functions, they do not prove that their cessation is irreversible. A stand-off period of 5 to 10 minutes is insufficient to achieve the irreversibility requirement of brain death. Because circulatory cessation inevitably leads to cessation of brain functions, first permanently and then irreversibly, the use of brain criterion is unnecessary to determine death in DCDD. Expanding brain death to permit it to be satisfied by permanent cessation of brain functions is controversial but has been considered as a possible means to declare death in uncontrolled DCDD. Copyright © 2016 Elsevier Inc. All rights reserved.

  10. A nonlinear flow-transition criterion for the onset of slugging in horizontal channels and pipes

    Science.gov (United States)

    Campbell, Bryce K.; Liu, Yuming

    2016-08-01

    In this work, the interfacial instability and transition of a two-fluid flow from a stratified state to large amplitude waves or slugs is considered. By combining an asymptotic approximation of the linear Orr-Sommerfeld analysis with nonlinear resonant wave interaction theory, a novel nonlinear slug-transition criterion is derived. This criterion corresponds to a bounding condition on the upper fluid's velocity in order to limit the amount of energy (provided by the linear instability) which is transferred to long waves through resonant wave interactions. It is proposed that such a condition can predict the formation of large-amplitude long waves and/or slugs. Quantitative comparisons of the onset of slugging are made between the prediction by the nonlinear transition criterion and the experimental measurements carried out in a horizontal square channel. Good agreement is observed. An additional heuristic model is developed which generalizes the transition criterion to flow through horizontal pipes. Comparisons are made for flows through different pipe diameters and over a wide range of fluid properties. Good agreement between the present theoretical predictions and the experimental measurements is also observed.

  11. Exploration of Child Care, Guidance and Service Occupations. Performance Objectives. Criterion Measures. Home Economics.

    Science.gov (United States)

    Duval County School Board, Jacksonville, FL.

    Several intermediate performance objectives and corresponding criterion measures are presented for each of five terminal objectives for a 12- to 18-week course designed to provide students in grades eight or nine with opportunities for exploring a broad range of child care, guidance, and service occupations. Major concepts include characteristics…

  12. Orientation to Home Economics Occupations. Performance Objectives. Criterion Measures. Home Economics.

    Science.gov (United States)

    Duval County School Board, Jacksonville, FL.

    Several intermediate performance objectives and corresponding criterion measures are listed for each of seven terminal objectives for a 6- to 9-week orientation to home economics occupations course for seventh grade students. The titles of the seven terminal objectives are Overview, Human Care Cluster, Food and Nutrition, Home Service Cluster,…

  13. Fundamentals of Child Care Occupations. Performance Objectives. Criterion Measures. Home Economics.

    Science.gov (United States)

    Duval County School Board, Jacksonville, FL.

    Several intermediate performance objectives and corresponding criterion measures are listed for each of four terminal objectives for a fundamentals of child care occupations course. The materials were designed to prepare students for entry level employment in jobs involving the care and guidance of children. Major concepts include growth,…

  14. Relationships between Classroom Schedule Types and Performance on the Algebra I Criterion-Referenced Test

    Science.gov (United States)

    Murray, Gregory V.; Moyer-Packenham, Patricia S.

    2014-01-01

    One option for length of individual mathematics class periods is the schedule type selected for Algebra I classes. This study examined the relationship between student achievement, as indicated by Algebra I Criterion-Referenced Test scores, and the schedule type for Algebra I classes. Data obtained from the Utah State Office of Education included…

  15. An Integrated Pruning Criterion for Ensemble Learning Based on Classification Accuracy and Diversity

    DEFF Research Database (Denmark)

    Fu, Bin; Wang, Zhihai; Pan, Rong

    2013-01-01

    Ensemble pruning is an important issue in the field of ensemble learning. Diversity is a key criterion to determine how the pruning process has been done and measure what result has been derived. However, there is few formal definitions of diversity yet. Hence, three important factors that should......-climbing search, compared with other definitions of diversity and other criteria....

  16. HEAT PUMP GAS COOLER CONTROL USING CRITERION OF MINIMUM OF EXERGY LOSSSES

    Directory of Open Access Journals (Sweden)

    Sit M.L.

    2014-08-01

    Full Text Available This paper focuses on the development of the criterion of optimality of transients of the control system, based on the minimum of exergy losses in the gas cooler of carbon dioxide heat pump. It is noted that the exergy quality criterion has a clear physical meaning, as compared with the integral quadratic criterion in which the choice of the coefficients in the integrand is not justified. Mathematic model of heat exchanger is obtained using the method of solving differential equations, without going to the irrational transfer functions. The model is reduced to transfer functions of the first and second order with the delay. The continuous temperature control system of heat pump gas cooler is considered. It is shown, that one of the versions of the control system for the minimization of the proposed criterion can be a combined control system using both the principle of the negative feedback and the principle of the invariance related to a number of disturbances affecting the processes of heat transfer in the heat exchanger.

  17. CO2 absorption in carbonate/bicarbonate solutions : The Danckwerts-criterion revisited

    NARCIS (Netherlands)

    Cents, A. H. G.; Brilman, D. W. F.; Versteeg, G. F.

    2005-01-01

    In industrial applications CO2 is frequently removed from gas streams at elevated pressures by absorption and subsequent chemical reaction in carbonate/bicarbonate solutions (e.g. Benfield process). The criterion that determines whether or not this reaction can be regarded as pseudo-first order is

  18. Modality Specificity as a Criterion for Diagnosing Central Auditory Processing Disorders.

    Science.gov (United States)

    McFarland, Dennis J.; Cacace, Anthony T.

    1995-01-01

    This paper examines the case for modality specificity as a criterion for improving the specificity of diagnosing central auditory processing disorders. Demonstrating the modality-specific nature of sensory processing deficits is seen as one way to rule out nonperceptual factors as explanations for observed dysfunction. (Author)

  19. Direct numerical simulations of non-premixed ethylene-air flames: Local flame extinction criterion

    KAUST Repository

    Lecoustre, Vivien R.

    2014-11-01

    Direct Numerical Simulations (DNS) of ethylene/air diffusion flame extinctions in decaying two-dimensional turbulence were performed. A Damköhler-number-based flame extinction criterion as provided by classical large activation energy asymptotic (AEA) theory is assessed for its validity in predicting flame extinction and compared to one based on Chemical Explosive Mode Analysis (CEMA) of the detailed chemistry. The DNS code solves compressible flow conservation equations using high order finite difference and explicit time integration schemes. The ethylene/air chemistry is simulated with a reduced mechanism that is generated based on the directed relation graph (DRG) based methods along with stiffness removal. The numerical configuration is an ethylene fuel strip embedded in ambient air and exposed to a prescribed decaying turbulent flow field. The emphasis of this study is on the several flame extinction events observed in contrived parametric simulations. A modified viscosity and changing pressure (MVCP) scheme was adopted in order to artificially manipulate the probability of flame extinction. Using MVCP, pressure was changed from the baseline case of 1 atm to 0.1 and 10 atm. In the high pressure MVCP case, the simulated flame is extinction-free, whereas in the low pressure MVCP case, the simulated flame features frequent extinction events and is close to global extinction. Results show that, despite its relative simplicity and provided that the global flame activation temperature is correctly calibrated, the AEA-based flame extinction criterion can accurately predict the simulated flame extinction events. It is also found that the AEA-based criterion provides predictions of flame extinction that are consistent with those provided by a CEMA-based criterion. This study supports the validity of a simple Damköhler-number-based criterion to predict flame extinction in engineering-level CFD models. © 2014 The Combustion Institute.

  20. Criterion distances and environmental correlates of active commuting to school in children

    Directory of Open Access Journals (Sweden)

    D'Haese Sara

    2011-08-01

    Full Text Available Abstract Background Active commuting to school can contribute to daily physical activity levels in children. Insight into the determinants of active commuting is needed, to promote such behavior in children living within a feasible commuting distance from school. This study determined feasible distances for walking and cycling to school (criterion distances in 11- to 12-year-old Belgian children. For children living within these criterion distances from school, the correlation between parental perceptions of the environment, the number of motorized vehicles per family and the commuting mode (active/passive to school was investigated. Methods Parents (n = 696 were contacted through 44 randomly selected classes of the final year (sixth grade in elementary schools in East- and West-Flanders. Parental environmental perceptions were obtained using the parent version of Neighborhood Environment Walkability Scale for Youth (NEWS-Y. Information about active commuting to school was obtained using a self-reported questionnaire for parents. Distances from the children's home to school were objectively measured with Routenet online route planner. Criterion distances were set at the distance in which at least 85% of the active commuters lived. After the determination of these criterion distances, multilevel analyses were conducted to determine correlates of active commuting to school within these distances. Results Almost sixty percent (59.3% of the total sample commuted actively to school. Criterion distances were set at 1.5 kilometers for walking and 3.0 kilometers for cycling. In the range of 2.01 - 2.50 kilometers household distance from school, the number of passive commuters exceeded the number of active commuters. For children who were living less than 3.0 kilometers away from school, only perceived accessibility by the parents was positively associated with active commuting to school. Within the group of active commuters, a longer distance to school

  1. Maintenance and enhancement of long-term multiple socioeconomic benefits to meet the needs of societies. Criterion 6.

    Science.gov (United States)

    Ken Skog; James Howard; Susan Alexander; Ken Cordell; Marla Emery; Evan Mercer; Shela Mou; Kristen Magis; Maureen. McDonough

    2011-01-01

    This report provides a comprehensive picture of current conditions and trends in our Nation's forests, its forest industries, and its forest communities. Although the first five criteria are centered in the environmental sphere of sustainability (with the exception of Criterion 2, which clearly overlaps the economic sphere), Criterion 6 is centered firmly in the...

  2. Remarks on the improved regularity criterion for the 2D Euler-Boussinesq equations with supercritical dissipation

    Science.gov (United States)

    Ye, Zhuan

    2016-12-01

    This paper is devoted to the investigation of the regularity criterion to the two-dimensional (2D) Euler-Boussinesq equations with supercritical dissipation. By making use of the Littlewood-Paley technique, we provide an improved regularity criterion involving the temperature at the scaling invariant level, which improves the previous results.

  3. Distinct anatomical correlates of discriminability and criterion setting in verbal recognition memory revealed by lesion-symptom mapping

    NARCIS (Netherlands)

    Biesbroek, J. Matthijs; van Zandvoort, Martine J E; Kappelle, L. Jaap; Schoo, Linda; Kuijf, Hugo J.; Velthuis, BK; Biessels, Geert Jan; Postma, Albert

    2015-01-01

    Recognition memory, that is, the ability to judge whether an item has been previously encountered in a particular context, depends on two factors: discriminability and criterion setting. Discriminability draws on memory processes while criterion setting (i.e., the application of a threshold

  4. An Optimal Partial Differential Equations-based Stopping Criterion for Medical Image Denoising.

    Science.gov (United States)

    Khanian, Maryam; Feizi, Awat; Davari, Ali

    2014-01-01

    Improving the quality of medical images at pre- and post-surgery operations are necessary for beginning and speeding up the recovery process. Partial differential equations-based models have become a powerful and well-known tool in different areas of image processing such as denoising, multiscale image analysis, edge detection and other fields of image processing and computer vision. In this paper, an algorithm for medical image denoising using anisotropic diffusion filter with a convenient stopping criterion is presented. In this regard, the current paper introduces two strategies: utilizing the efficient explicit method due to its advantages with presenting impressive software technique to effectively solve the anisotropic diffusion filter which is mathematically unstable, proposing an automatic stopping criterion, that takes into consideration just input image, as opposed to other stopping criteria, besides the quality of denoised image, easiness and time. Various medical images are examined to confirm the claim.

  5. Monitoring medication adherence by unannounced pill counts conducted by telephone: reliability and criterion-related validity.

    Science.gov (United States)

    Kalichman, Seth C; Amaral, Christina M; Cherry, Chauncey; Flanagan, Jody; Pope, Howard; Eaton, Lisa; Kalichman, Moira O; Cain, Demetria; Detorio, Mervi; Caliendo, Angela; Schinazi, Raymond F

    2008-01-01

    Although demonstrated valid for monitoring medication adherence, unannounced pill counts conducted in patients' homes are costly and logistically challenging. Telephone-based unannounced pill counts offer a promising adaptation that resolves most of the limitations of home-based pill counting. We tested the reliability and criterion-related validity of a telephone-based unannounced pill count assessment of antiretroviral adherence. HIV-positive men and women (N = 89) in Atlanta, Georgia, completed a telephone-based unannounced pill count and provided contemporaneous blood specimens to obtain viral loads; 68 participants also received an immediate second pill count conducted during an unannounced home visit. A high degree of concordance was observed between the number of pills counted on the telephone and in the home (intraclass correlation [ICC] = .981, p criterion-related validity. Unannounced telephone-based pill counts offer a feasible objective method for monitoring medication adherence.

  6. Aggressive Attitudes in Middle Schools: A Factor Structure and Criterion-Related Validity Study.

    Science.gov (United States)

    Huang, Francis L; Cornell, Dewey G; Konold, Timothy R

    2015-08-01

    Student attitudes toward aggression have been linked to individual aggressive behavior, but the relationship between school-wide normative beliefs about aggression and aggressive behavior poses some important measurement challenges that have not been adequately examined. The current study investigated the factor structure, measurement invariance, and criterion-related validity of a six-item Aggressive Attitudes scale using a large sample of seventh- and eighth-grade students (n = 39,364) from 423 schools. Analytic procedures accounted for the frequently ignored modeling problems of clustered and ordinal data to provide more reliable and accurate model estimates and standard errors. The resulting second-order factor structure of the Aggressive Attitudes scale demonstrated measurement invariance across gender, grade, and race/ethnicity groups. Criterion-related validity was supported with eight student- and school-level indices of aggressive behavior. © The Author(s) 2014.

  7. Criterion-related validity of challenging behaviour scales: a review of evidence in the literature.

    Science.gov (United States)

    Turton, Raistrick W

    2015-03-01

    Behaviour that challenges has negative impacts on physical and emotional well-being and quality of life. Challenging behaviour scales are used to identify needs and evaluate interventions and must be valid measures. Criterion-related validity is important, and the best quality assessment uses direct measures of behaviour as criteria. Previous reviews of scales affirm their validity but present little supporting evidence. The current review examines the evidence presented in studies of validity. Searches of MEDLINE and PsycINFO to identify scales that focus on challenging behaviour and find publications that assess their criterion-related validity. Searches identified twelve scales and 21 publications that assess validity. One assessment used direct measures of behaviour, and the remainder used indirect measures that themselves have limited evidence of validity, including membership of diagnostic or service groups and other scales. Little firm evidence of validity was found, but what was found is encouraging. © 2014 John Wiley & Sons Ltd.

  8. [GSH fermentation process modeling using entropy-criterion based RBF neural network model].

    Science.gov (United States)

    Tan, Zuoping; Wang, Shitong; Deng, Zhaohong; Du, Guocheng

    2008-05-01

    The prediction accuracy and generalization of GSH fermentation process modeling are often deteriorated by noise existing in the corresponding experimental data. In order to avoid this problem, we present a novel RBF neural network modeling approach based on entropy criterion. It considers the whole distribution structure of the training data set in the parameter learning process compared with the traditional MSE-criterion based parameter learning, and thus effectively avoids the weak generalization and over-learning. Then the proposed approach is applied to the GSH fermentation process modeling. Our results demonstrate that this proposed method has better prediction accuracy, generalization and robustness such that it offers a potential application merit for the GSH fermentation process modeling.

  9. Molecular Based Temperature and Strain Rate Dependent Yield Criterion for Anisotropic Elastomeric Thin Films

    Science.gov (United States)

    Bosi, F.; Pellegrino, S.

    2017-01-01

    A molecular formulation of the onset of plasticity is proposed to assess temperature and strain rate effects in anisotropic semi-crystalline rubbery films. The presented plane stress criterion is based on the strain rate-temperature superposition principle and the cooperative theory of yielding, where some parameters are assumed to be material constants, while others are considered to depend on specific modes of deformation. An orthotropic yield function is developed for a linear low density polyethylene thin film. Uniaxial and biaxial inflation experiments were carried out to determine the yield stress of the membrane via a strain recovery method. It is shown that the 3% offset method predicts the uniaxial elastoplastic transition with good accuracy. Both the tensile yield points along the two principal directions of the film and the biaxial yield stresses are found to obey the superposition principle. The proposed yield criterion is compared against experimental measurements, showing excellent agreement over a wide range of deformation rates and temperatures.

  10. On the Bohm criterion in the presence of a magnetic field

    Directory of Open Access Journals (Sweden)

    J.E. Allen

    2017-08-01

    Full Text Available The present paper deals with a particular case involving a magnetic field, namely that of a positive column situated in an axial magnetic field, and it is shown that the Bohm criterion still holds for the normal component of the ion velocity at the plasma boundary. This result is of considerable interest because the Boltzmann relation for the electron density has not been assumed. It can be recalled that the criterion was originally derived by Bohm using the Boltzmann relation for the electron density. In the present case a Boltzm ann gradient conditionhas been found at the plasma boundary which leads to the usual Bohm velocity. Some insight can be gained by considering the ion and electron densities plotted against potential, for both the plasma and the sheath regions. It would appear that the result is a general one applicable to other situations.

  11. Seismic bearing capacity of strip footings on rock masses using the Hoek–Brown failure criterion

    Directory of Open Access Journals (Sweden)

    Amin Keshavarz

    2016-04-01

    Full Text Available In this paper, the bearing capacity of strip footings on rock masses has been studied in the seismic case. The stress characteristics or slip line method was used for analysis. The problem was analyzed in the plane strain condition using the Hoek–Brown failure criterion. First, the equilibrium equations along the stress characteristics were obtained and the rock failure criterion was applied. Then, the equations were solved using the finite difference method. A computer code has been provided for analysis. Given the footing and rock parameters, the code can calculate the stress characteristics network and obtain the stress distribution under the footing. The seismic effects have been applied as the horizontal and vertical pseudo-static coefficients. The results of this paper are very close to those of the other studies. The seismic bearing capacity of weightless rock masses can be obtained using the proposed equations and graphs without calculating the whole stress characteristics network.

  12. Ethical leadership: meta-analytic evidence of criterion-related and incremental validity.

    Science.gov (United States)

    Ng, Thomas W H; Feldman, Daniel C

    2015-05-01

    This study examines the criterion-related and incremental validity of ethical leadership (EL) with meta-analytic data. Across 101 samples published over the last 15 years (N = 29,620), we observed that EL demonstrated acceptable criterion-related validity with variables that tap followers' job attitudes, job performance, and evaluations of their leaders. Further, followers' trust in the leader mediated the relationships of EL with job attitudes and performance. In terms of incremental validity, we found that EL significantly, albeit weakly in some cases, predicted task performance, citizenship behavior, and counterproductive work behavior-even after controlling for the effects of such variables as transformational leadership, use of contingent rewards, management by exception, interactional fairness, and destructive leadership. The article concludes with a discussion of ways to strengthen the incremental validity of EL. (PsycINFO Database Record (c) 2015 APA, all rights reserved).

  13. A General Zero Attraction Proportionate Normalized Maximum Correntropy Criterion Algorithm for Sparse System Identification

    Directory of Open Access Journals (Sweden)

    Yingsong Li

    2017-10-01

    Full Text Available A general zero attraction (GZA proportionate normalized maximum correntropy criterion (GZA-PNMCC algorithm is devised and presented on the basis of the proportionate-type adaptive filter techniques and zero attracting theory to highly improve the sparse system estimation behavior of the classical MCC algorithm within the framework of the sparse system identifications. The newly-developed GZA-PNMCC algorithm is carried out by introducing a parameter adjusting function into the cost function of the typical proportionate normalized maximum correntropy criterion (PNMCC to create a zero attraction term. The developed optimization framework unifies the derivation of the zero attraction-based PNMCC algorithms. The developed GZA-PNMCC algorithm further exploits the impulsive response sparsity in comparison with the proportionate-type-based NMCC algorithm due to the GZA zero attraction. The superior performance of the GZA-PNMCC algorithm for estimating a sparse system in a non-Gaussian noise environment is proven by simulations.

  14. Wavelength selection in injection-driven Hele-Shaw flows: A maximum amplitude criterion

    Science.gov (United States)

    Dias, Eduardo; Miranda, Jose

    2013-11-01

    As in most interfacial flow problems, the standard theoretical procedure to establish wavelength selection in the viscous fingering instability is to maximize the linear growth rate. However, there are important discrepancies between previous theoretical predictions and existing experimental data. In this work we perform a linear stability analysis of the radial Hele-Shaw flow system that takes into account the combined action of viscous normal stresses and wetting effects. Most importantly, we introduce an alternative selection criterion for which the selected wavelength is determined by the maximum of the interfacial perturbation amplitude. The effectiveness of such a criterion is substantiated by the significantly improved agreement between theory and experiments. We thank CNPq (Brazilian Sponsor) for financial support.

  15. Modified maximum tangential stress criterion for fracture behavior of zirconia/veneer interfaces.

    Science.gov (United States)

    Mirsayar, M M; Park, P

    2016-06-01

    The veneering porcelain sintered on zirconia is widely used in dental prostheses, but repeated mechanical loadings may cause a fracture such as edge chipping or delamination. In order to predict the crack initiation angle and fracture toughness of zirconia/veneer bi-layered components subjected to mixed mode loadings, the accuracy of a new and traditional fracture criteria are investigated. A modified maximum tangential stress criterion considering the effect of T-stress and critical distance theory is introduced, and compared to three traditional fracture criteria. Comparisons to the recently published fracture test data show that the traditional fracture criteria are not able to properly predict the fracture initiation conditions in zirconia/veneer bi-material joints. The modified maximum tangential stress criterion provides more accurate predictions of the experimental results than the traditional fracture criteria. Copyright © 2015 Elsevier Ltd. All rights reserved.

  16. A Study of Application of OPF with N-1 Criterion to a Large Power System

    Science.gov (United States)

    Takazawa, Tsuyoshi; Tada, Yasuyuki; Tanabe, Ryuya; Kurita, Atsushi

    This paper presents a practical method for OPF (Optimal Power Flow) with N-1 criterion, that can apply to a large power system.Though there are some OPFs which considers N-1 criterion, it is difficult to apply them to a large system.Because its calculation time and used memories increase rapidly as a scale of the system grows up.This paper suggests a formulation using power flow sensitivities to constrain power flows under assumed contingencies.This formulation reduces parameters in the OPF, and allows to cut down redundant constraints.The accuracy and effectiveness are probed through analyzing a large power system which consists of 185 generators, 1048 buses, and 1494 branches.

  17. An Optimal Partial Differential Equations-based Stopping Criterion for Medical Image Denoising

    Science.gov (United States)

    Khanian, Maryam; Feizi, Awat; Davari, Ali

    2014-01-01

    Improving the quality of medical images at pre- and post-surgery operations are necessary for beginning and speeding up the recovery process. Partial differential equations-based models have become a powerful and well-known tool in different areas of image processing such as denoising, multiscale image analysis, edge detection and other fields of image processing and computer vision. In this paper, an algorithm for medical image denoising using anisotropic diffusion filter with a convenient stopping criterion is presented. In this regard, the current paper introduces two strategies: utilizing the efficient explicit method due to its advantages with presenting impressive software technique to effectively solve the anisotropic diffusion filter which is mathematically unstable, proposing an automatic stopping criterion, that takes into consideration just input image, as opposed to other stopping criteria, besides the quality of denoised image, easiness and time. Various medical images are examined to confirm the claim. PMID:24696809

  18. Focused information criterion and model averaging based on weighted composite quantile regression

    KAUST Repository

    Xu, Ganggang

    2013-08-13

    We study the focused information criterion and frequentist model averaging and their application to post-model-selection inference for weighted composite quantile regression (WCQR) in the context of the additive partial linear models. With the non-parametric functions approximated by polynomial splines, we show that, under certain conditions, the asymptotic distribution of the frequentist model averaging WCQR-estimator of a focused parameter is a non-linear mixture of normal distributions. This asymptotic distribution is used to construct confidence intervals that achieve the nominal coverage probability. With properly chosen weights, the focused information criterion based WCQR estimators are not only robust to outliers and non-normal residuals but also can achieve efficiency close to the maximum likelihood estimator, without assuming the true error distribution. Simulation studies and a real data analysis are used to illustrate the effectiveness of the proposed procedure. © 2013 Board of the Foundation of the Scandinavian Journal of Statistics..

  19. Strength criterion for rocks under compressive-tensile stresses and its application

    Directory of Open Access Journals (Sweden)

    Mingqing You

    2015-08-01

    Full Text Available Estimating in-situ stress with hydraulic borehole fracturing involves tensile strength of rock. Several strength criteria with three parameters result in tensile strengths with great differences, although they may describe the relation between strength of rock and confining pressure with low misfits. The exponential criterion provides acceptable magnitudes of tensile strengths for granites and over-estimates that for other rocks, but the criterion with tension cut-off is applicable to all rocks. The breakdown pressure will be lower than the shut-in pressure during hydraulic borehole fracturing, when the maximum horizontal principal stress is 2 times larger than the minor one; and it is not the peak value in the first cycle, but the point where the slope of pressure-time curve begins to decline.

  20. Improved Robust Stability Criterion of Networked Control Systems with Transmission Delays and Packet Loss

    Directory of Open Access Journals (Sweden)

    Shenping Xiao

    2014-01-01

    Full Text Available The problem of stability analysis for a class of networked control systems (NCSs with network-induced delay and packet dropout is investigated in this paper. Based on the working mechanism of zero-order holder, the closed-loop NCS is modeled as a continuous-time linear system with input delay. By introducing a novel Lyapunov-Krasovskii functional which splits both the lower and upper bounds of the delay into two subintervals, respectively, and utilizes reciprocally convex combination technique, a new stability criterion is derived in terms of linear matrix inequalities. Compared with previous results in the literature, the obtained stability criterion is less conservative. Numerical examples demonstrate the validity and feasibility of the proposed method.

  1. A theoretical derivation of the Hoek–Brown failure criterion for rock materials

    Directory of Open Access Journals (Sweden)

    Jianping Zuo

    2015-08-01

    Full Text Available This study uses a three-dimensional crack model to theoretically derive the Hoek–Brown rock failure criterion based on the linear elastic fracture theory. Specifically, we argue that a failure characteristic factor needs to exceed a critical value when macro-failure occurs. This factor is a product of the micro-failure orientation angle (characterizing the density and orientation of damaged micro-cracks and the changing rate of the angle with respect to the major principal stress (characterizing the microscopic stability of damaged cracks. We further demonstrate that the factor mathematically leads to the empirical Hoek–Brown rock failure criterion. Thus, the proposed factor is able to successfully relate the evolution of microscopic damaged crack characteristics to macro-failure. Based on this theoretical development, we also propose a quantitative relationship between the brittle–ductile transition point and confining pressure, which is consistent with experimental observations.

  2. Multi-criterion water quality analysis of the Danube River in Serbia: A visualisation approach.

    Science.gov (United States)

    Walker, David; Jakovljević, Dejana; Savić, Dragan; Radovanović, Milan

    2015-08-01

    River quality analysis is an important activity which, in Serbia, has been performed using the Serbian Water Quality Index (SWQI). This is a measure based on a weighted aggregation of 10 water quality parameters. In this work, alternative methods drawing on visualisation approaches used in multi-criterion decision analysis are applied to the problem of evaluating river quality in the Danube. Two methods are considered: one which constructs a graph using the dominance relation combined with a further multi-criterion ranking method, average rank, and the other in which the dimensionality of the data is reduced using PCA for visualisation. Results for data collected in 2010 are analysed and compared with the corresponding SWQI values for the river in that year, and we find that by employing these methods it is possible to reveal more information within the data than is possible by using SWQI alone. Copyright © 2015 Elsevier Ltd. All rights reserved.

  3. A Short-Circuit Safe Operation Area Identification Criterion for SiC MOSFET Power Modules

    DEFF Research Database (Denmark)

    Reigosa, Paula Diaz; Iannuzzo, Francesco; Luo, Haoze

    2017-01-01

    This paper proposes a new method for the investigation of the short-circuit safe operation area (SCSOA) of state-of-the-art SiC MOSFET power modules rated at 1.2 kV based on the variations in SiC MOSFET electrical parameters (e.g., short-circuit current and gate–source voltage). According......-circuit-current-based criterion; and 2) the gate-voltage-based criterion. The applicability of these two criteria makes possible the SCSOA evaluation of SiC MOSFETs with some safety margins in order to avoid unnecessary failures during their SCSOA characterization. SiC MOSFET power modules from two different manufacturers...... are experimentally tested in order to demonstrate the procedure of the method. The obtained results can be used to have a better insight of the SCSOA of SiC MOSFETs and their physical limits....

  4. Criterion for Estimation of Ecological Safety of Objects of Urban Transport Construction

    Science.gov (United States)

    Bakaeva, N. V.; Chernyaeva, I. V.

    2017-11-01

    A new approach to assess the ecological safety of the urban environment including urban transport facilities is being considered. The chemical and acoustic pollution of the environment from the impact of the urban transport construction objects is analyzed. The description of the sustainable state concept and ecological balance of the urban environment is given. A criterion for assessing environmental safety based on a comprehensive indicator of the city’s biosphere compatibility was proposed. The scale of environmental safety assessments is constructed.

  5. The Success of Linear Bootstrapping Models: Decision Domain-, Expertise-, and Criterion-Specific Meta-Analysis

    OpenAIRE

    Esther Kaufmann; Werner W Wittmann

    2016-01-01

    The success of bootstrapping or replacing a human judge with a model (e.g., an equation) has been demonstrated in Paul Meehl's (1954) seminal work and bolstered by the results of several meta-analyses. To date, however, analyses considering different types of meta-analyses as well as the potential dependence of bootstrapping success on the decision domain, the level of expertise of the human judge, and the criterion for what constitutes an accurate decision have been missing from the literatu...

  6. Mixed-mode fracture criterion of the delamination onset for composite laminates

    Science.gov (United States)

    Yan, Xiangqiao; Du, Shanyi; Wang, Duo

    1991-04-01

    The delamination problem of composite laminates is investigated. The delamination damage in composite laminates is regarded as a linecrack, and the fracture mechanics method is used. Due to the existence of interlaminar stresses at the free-edge in composite laminates, the delamination crack is generally mixed-mode. Thus, the mixed-mode fracture criterion of the delamination onset for composite laminates is presented.

  7. h-Adaptive Mesh Generation using Electric Field Intensity Value as a Criterion (in Japanese)

    OpenAIRE

    Toyonaga, Kiyomi; Cingoski, VLATKO; Kaneda, Kazufumi; Yamashita, Hideo

    1994-01-01

    Finite mesh divisions are essential to obtain accurate solution of two dimensional electric field analysis. It requires the technical knowledge to generate a suitable fine mesh divisions. In electric field problem, analysts are usually interested in the electric field intensity and its distribution. In order to obtain electric field intensity with high-accuracy, we have developed and adaptive mesh generator using electric field intensity value as a criterion.

  8. Using Exit Charts to Develop an Early Stopping Criterion for Turbo Decoding

    OpenAIRE

    Potman, J.; Hoeksema, F.W.; Slump, Cornelis H.

    2004-01-01

    Early stopping criteria are used to determine when additional decoder iterations result in little or no improvement in the bit- error-rate (BER) at the output of a Turbo decoder. This paper proposes a stopping criterion based on Extrinsic Information Transfer (EXIT) charts. The generation and properties of EXIT charts are discussed. Convergence and BER predictions obtained using EXIT charts are compared to results obtained using Turbo decoder simulation. Finally this paper describes the use o...

  9. EVALUATION OF FLIGHT QUALITY BY RVSM, PBN, CATII, CATIII STANDARDS BASED ON NIKULIN MODIFIED CRITERION

    Directory of Open Access Journals (Sweden)

    L. O. Marasanov

    2017-01-01

    Full Text Available Flight operations with the use of standards Reduced Vertical Separation Minimum (RVSM; Performance-based Navigation (PBN; auto landings on CATII CATIII ICAO categories have become common practices in relation to the relevant requirements of ICAO. In this case, operators should receive special operational permits, due to that the task of determining the feasibility of such operations became operational. Increasing the reliability requirements to estimate the accuracy characteristics quality of flight operations requires the development and improvement of methods for their evaluation. First of all, the application of methods based on more accurate representations of error models with more correct models of the error probability density distribution is required, especially in the field of large, rare errors. This article solves one of the tasks of this complex approach to estimate the accuracy characteristics – the task of processing flight information in order to determine the estimates of the accuracy characteristics of the flight-navigation complex (FNC, since the problem solving provides the possibility of obtaining an integral estimate of the accuracy characteristics based on the application of combined methods. It is shown that the power of the Nikulin criterion is almost twice as high as the Pearson power criterion, which in some cases excludes the acceptance of incorrect hypotheses about the form of the hypothetical distribution function. The use of Nikulin criterion makes it possible to significantly improve the assessments accuracy of flight quality performance characteristics according to RVSM, PBN, CATII and CATIII standards by increasing the criterion power. It significantly increases the estimates accuracy of the accuracy characteristics obtained during the deciphering of flight information.

  10. AGGLOMERATIVE CLUSTERING OF SOUND RECORD SPEECH SEGMENTS BASED ON BAYESIAN INFORMATION CRITERION

    Directory of Open Access Journals (Sweden)

    O. Yu. Kydashev

    2013-01-01

    Full Text Available This paper presents the detailed description of agglomerative clustering system implementation for speech segments based on Bayesian information criterion. Numerical experiment results with different acoustic features, as well as the full and diagonal covariance matrices application are given. The error rate DER equal to 6.4% for audio records of radio «Svoboda» was achieved by means of designed system.

  11. A design-based approximation to the Bayes Information Criterion in finite population sampling

    Directory of Open Access Journals (Sweden)

    Enrico Fabrizi

    2014-05-01

    Full Text Available In this article, various issues related to the implementation of the usual Bayesian Information Criterion (BIC are critically examined in the context of modelling a finite population. A suitable design-based approximation to the BIC is proposed in order to avoid the derivation of the exact likelihood of the sample which is often very complex in a finite population sampling. The approximation is justified using a theoretical argument and a Monte Carlo simulation study.

  12. Relationships Between Classroom Schedule Types and Performance on the Algebra I Criterion-Referenced Test

    OpenAIRE

    Murray, Gregory V.

    2012-01-01

    Public education has options with regard to educational settings and structures. States and school districts may select varying lengths for the school year, lengths for the school day, and lengths for individual class periods. In Utah, one measure of students' achievement is scores on the State's end-of-level criterion-referenced test (CRT) for Algebra I. Additionally, an option regarding educational structures is the schedule type used to deliver Algebra I classes. This study examined the re...

  13. State Criterion of Wind Turbine Generator in Operation with Using Tower Shadow Effect

    OpenAIRE

    内藤, 督; 佐藤, 孝紀; 八木橋, 大介; 徳永, 義孝

    2002-01-01

    Because of low cost and maintenance free, inductron machines are widely used as the wind turbine generators. In order to get wind energy effectively, pole-change-type induction generators are adopted. Otherwise, the pole-change-type induction generator causes the voltage dips at starting and at pole changing time. To keep the power quality, it is important to know the state change of the generator operation. In this paper a new state criterion of wind turbine generator in operation using the ...

  14. Option Pricing under Risk-Minimization Criterion in an Incomplete Market with the Finite Difference Method

    Directory of Open Access Journals (Sweden)

    Xinfeng Ruan

    2013-01-01

    Full Text Available We study option pricing with risk-minimization criterion in an incomplete market where the dynamics of the risky underlying asset is governed by a jump diffusion equation with stochastic volatility. We obtain the Radon-Nikodym derivative for the minimal martingale measure and a partial integro-differential equation (PIDE of European option. The finite difference method is employed to compute the European option valuation of PIDE.

  15. Correction to "Evidence for the Criterion Validity and Clinical Utility of the Pathological Narcissism Inventory".

    Science.gov (United States)

    Thomas, Katherine M; Wright, Aidan G C; Lukowitsky, Mark R; Donnellan, M Brent; Hopwood, Christopher J

    2016-04-01

    In our article "Evidence for the Criterion Validity and Clinical Utility of the Pathological Narcissism Inventory" (2012), we provided incorrect values for the r(contrast-cv) coefficients we presented in Table 1. In the current report, we provide correct r(contrast-cv) values in Table 1 and discuss the implications of our updated results, particularly with respect to how these results differ from our initial report. © The Author(s) 2015.

  16. Assessment centers versus cognitive ability tests: Challenging the conventional wisdom on criterion-related validity.

    Science.gov (United States)

    Sackett, Paul R; Shewach, Oren R; Keiser, Heidi N

    2017-10-01

    Separate meta-analyses of the cognitive ability and assessment center (AC) literatures report higher criterion-related validity for cognitive ability tests in predicting job performance. We instead focus on 17 samples in which both AC and ability scores are obtained for the same examinees and used to predict the same criterion. Thus, we control for differences in job type and in criteria that may have affected prior conclusions. In contrast to Schmidt and Hunter's (1998) meta-analysis, reporting mean validity of .51 for ability and .37 for ACs, we found using random-effects models mean validity of .22 for ability and .44 for ACs using comparable corrections for range restriction and measurement error in the criterion. We posit that 2 factors contribute to the differences in findings: (a) ACs being used on populations already restricted on cognitive ability and (b) the use of less cognitively loaded criteria in AC validation research. (PsycINFO Database Record (c) 2017 APA, all rights reserved).

  17. Brief report: The Brief Alcohol Social Density Assessment (BASDA): convergent, criterion-related, and incremental validity.

    Science.gov (United States)

    MacKillop, James; Acker, John D; Bollinger, Jared; Clifton, Allan; Miller, Joshua D; Campbell, W Keith; Goodie, Adam S

    2013-09-01

    Alcohol misuse is substantially influenced by social factors, but systematic assessments of social network drinking are typically lengthy. The goal of the present study was to provide further validation of a brief measure of social network alcohol use, the Brief Alcohol Social Density Assessment (BASDA), in a sample of emerging adults. Specifically, the study sought to examine the BASDA's convergent, criterion, and incremental validity in relation to well-established measures of drinking motives and problematic drinking. Participants were 354 undergraduates who were assessed using the BASDA, the Alcohol Use Disorders Identification Test (AUDIT), and the Drinking Motives Questionnaire. Significant associations were observed between the BASDA index of alcohol-related social density and alcohol misuse, social motives, and conformity motives, supporting convergent validity. Criterion-related validity was supported by evidence that significantly greater alcohol involvement was present in the social networks of individuals scoring at or above an AUDIT score of 8, a validated criterion for hazardous drinking. Finally, the BASDA index was significantly associated with alcohol misuse above and beyond drinking motives in relation to AUDIT scores, supporting incremental validity. Taken together, these findings provide further support for the BASDA as an efficient measure of drinking in an individual's social network. Methodological considerations as well as recommendations for future investigations in this area are discussed.

  18. [Criterion-related validity of the Menopause-Specific Quality of Life Questionnaire-Chinese version].

    Science.gov (United States)

    Yang, Jiao; Ren, Yujia; Liu, Minhui; Wang, Qingyan; Tang, Siyuan

    2014-07-01

    To investigate the criterion-related validity of Menopause-Specific Quality of Life Questionnaire (MENQOL)-Chinese version and to evaluate the effect of menopausal symptoms on health related quality of life. This study was a cross-sectional survey. Three communities were randomly chosen in Changsha, and then 340 menopausal women aged 45-55 years were randomly chosen from the documented data of the 3 community health service centers. They were required to fill out 4 questionnaires: demographic questionnaire, MENQOL-Chinese version, Kupperman Index (KI) and World Health Organization Quality of Life (WHQOL)-BREF. Correlation analysis was used to measure the criterion-related validity. MENQOL-Chinese version subscales (vasomotor, psycho-social, sexual and physical) and KI total score were positively correlated (r=0.800, 0.751, 0.607, 0.906 respectively); while negatively correlated with WHOQOL-BREF total score (r =-0.694, -0.851, -0.585, -0.873 respectively); MENQOL-Chinese version subscales (vasomotor, psycho-social, sexual and physical) were significantly correlated with WHOQOL-BREF subscales (physical, psychological, social relationship, environment), and the physical domain was the highest among the correlation coefficients (r=-0.915). MENQOL-Chinese version shows relatively high criterion-related validity compared with KI and WHOQOL-BREF, which can be widely used to measure the quality of life of menopause women in China.

  19. A new self-report inventory of dyslexia for students: criterion and construct validity.

    Science.gov (United States)

    Tamboer, Peter; Vorst, Harrie C M

    2015-02-01

    The validity of a Dutch self-report inventory of dyslexia was ascertained in two samples of students. Six biographical questions, 20 general language statements and 56 specific language statements were based on dyslexia as a multi-dimensional deficit. Dyslexia and non-dyslexia were assessed with two criteria: identification with test results (Sample 1) and classification using biographical information (both samples). Using discriminant analyses, these criteria were predicted with various groups of statements. All together, 11 discriminant functions were used to estimate classification accuracy of the inventory. In Sample 1, 15 statements predicted the test criterion with classification accuracy of 98%, and 18 statements predicted the biographical criterion with classification accuracy of 97%. In Sample 2, 16 statements predicted the biographical criterion with classification accuracy of 94%. Estimations of positive and negative predictive value were 89% and 99%. Items of various discriminant functions were factor analysed to find characteristic difficulties of students with dyslexia, resulting in a five-factor structure in Sample 1 and a four-factor structure in Sample 2. Answer bias was investigated with measures of internal consistency reliability. Less than 20 self-report items are sufficient to accurately classify students with and without dyslexia. This supports the usefulness of self-assessment of dyslexia as a valid alternative to diagnostic test batteries. Copyright © 2015 John Wiley & Sons, Ltd.

  20. Energy conditions and DK stability criterion in the non-local gravity

    CERN Document Server

    Wu, Ya-Bo; Yang, Wei-Qiang; Zhang, Nan; Chen, Bo-Hai

    2016-01-01

    We study and derive the energy conditions and the Dolgov-Kawasaki (DK) stability criterion in non-local gravity, which is the modified theory of general relativity (GR) obtained by adding a term $m^2R\\Box^{-2}R$ to the Einstein-Hilbert action. Moreover, in order to get some insight on the meaning of the energy conditions, we illustrate the evolutions of four energy conditions with the parameter $\\alpha$ and redshift $z$. By analysis we give the constraint on the parameters $\\alpha$, namely, $|\\alpha|\\leq0.26$. Furthermore, by means of the Dolgov-Kawasaki stability criterion in the non-local gravity we find that the effective mass $m_\\text{eff}^2$ of the dynamical field $U$ is negative in any value ranges of parameter $\\alpha$, which is consistent with the result given in [JCAP 1607, 003 (2016)], i.e. the field $U$ is a ghost one. The result shows that the Dolgov-Kawasaki stability criterion cannot give any constraint on the parameter $\\alpha$.

  1. New Quality Assessment Criterion of AlSi5Cu1 Alloy

    Directory of Open Access Journals (Sweden)

    M. Wierzbińska

    2007-07-01

    Full Text Available The paper presents the discussion of the results of mechanical testing for aluminium foundry alloy AlSi5Cu1Mg for high-loaded machine elements. Values of yield strength (Rp0.2, tensile strength (Rm, elongation(A5 and hardness (HB are usually considered as the primary quality assessment criterion for a manufacturing process. It was concluded, that this criterion, A5 index particularly, is unsatisfactory to estimate the plasticity of the alloy and its crack resistance in the presence of sharp-pointed stress concentrators or microcracks. More adequate parameter is plane strain fracture toughness KIc. However, size of the samples appeared to be twice as large as would be needed to fulfill requirements of test conditions, and the test itself is laborious and time-consuming that it becomes impractical as a acceptance test. Therefore, substitute test for quality assessment – determination of tensile strength in the presence of a sharp notch kmR was applied. The comparative analysis of kmR/Rp0.2 ratio, as a more enhanced fatigue resistance criterion than kmR and plane strain fracture toughness KIc of the alloy was performed. It was assumed that kmR/Rp0.2 parameter has good correlation with the critical stress intensity factor KIc Thus, under manufacturing process conditions, being unable to carry out KIc test, it may be successfully replaced by kmR test.

  2. The minimally acceptable classification criterion for surgical skill: intent vectors and separability of raw motion data.

    Science.gov (United States)

    Dockter, Rodney L; Lendvay, Thomas S; Sweet, Robert M; Kowalewski, Timothy M

    2017-07-01

    Minimally invasive surgery requires objective methods for skill evaluation and training. This work presents the minimally acceptable classification (MAC) criterion for computational surgery: Given an obvious novice and an obvious expert, a surgical skill evaluation classifier must yield 100% accuracy. We propose that a rigorous motion analysis algorithm must meet this minimal benchmark in order to justify its cost and use. We use this benchmark to investigate two concepts: First, how separable is raw, multidimensional dry laboratory laparoscopic motion data between obvious novices and obvious experts? We utilized information theoretic techniques to analytically address this. Second, we examined the use of intent vectors to classify surgical skill using three FLS tasks. We found that raw motion data alone are not sufficient to classify skill level; however, the intent vector approach is successful in classifying surgical skill level for certain tasks according to the MAC criterion. For a pattern cutting task, this approach yields 100% accuracy in leave-one-user-out cross-validation. Compared to prior art, the intent vector approach provides a generalized method to assess laparoscopic surgical skill using basic motion segments and passes the MAC criterion for some but not all FLS tasks.

  3. A ductile fracture criterion with Zener-Hollomon parameter of pure molybdenum sheet in thermal forming

    Directory of Open Access Journals (Sweden)

    Wang Chu

    2015-01-01

    Full Text Available Formability of pure molybdenum in thermal forming process has been greatly improved, but it is still hard to avoid the generation of rupture and other quality defects. In this paper, a ductile fracture criterion of pure molybdenum sheet in thermal forming was established by considering the plastic deformation capacity of material and stress states, which can be used to describe fracture behaviour and critical rupture prediction of pure molybdenum sheet during hot forming process. Based on the isothermal uniaxial tensile tests which performed at 993 to 1143 K with strain rate range from 0.0005 to 0.2 s−1, the material parameters are calculated by the combination method of experiment with FEsimulation. Based on the observation, new fracture criteria can be expressed as a function of Zener-Hollomon parameter. The critical fracture value that calculated by Oyane-Sato criterion increases with increasing temperature and decreasing strain rate. The ductile fracture criterion with Zener-Hollomon parameter of pure molybdenum in thermal forming is proposed.

  4. An error threshold criterion for singular value decomposition modes extracted from PIV data

    Science.gov (United States)

    Epps, Brenden P.; Techet, Alexandra H.

    2010-02-01

    Singular value decomposition (SVD) is often used as a tool to analyze particle image velocimetry (PIV) data. However, experimental error tends to corrupt higher SVD modes, in which the root mean square velocity value is smaller than the experimental error. Therefore, we suggest that the threshold criterion, s_k >sqrt{DT}ɛ, can be used as a rough limit of the validity of SVD modes extracted from experimental data (where s k is the singular value of mode k, D and T are the number of data sites and time steps, respectively, and ɛ is the root mean square PIV error). By synthesizing the relationship between the general SVD procedure and its two special cases— biorthogonal decomposition (BOD) and proper orthogonal decomposition (POD)—we show that our criterion can be used to assess modes extracted by either BOD or POD. We apply our threshold criterion to PIV data of the wake behind a live swimming Giant Danio ( Danio aequipinnatus). The biorthogonal decomposition of the fish wake, which is a reverse-Kármán street, reveals that the first four modes are similar to the modes of a regular Kármán street created in the wake of a stationary cylinder and that higher modes are corrupted by experimental error.

  5. Discussion on Usability of the Niyama Criterion for Porosity Predicting in Cast Iron Castings

    Directory of Open Access Journals (Sweden)

    Ignaszak Z.

    2017-09-01

    Full Text Available The paper refers to previous publications of the author, focused on criteria of casting feeding, including the thermal criterion proposed by Niyama. On the basis of this criterion, present in the post-processing of practically all the simulation codes, danger of casting compactness (in the sense of soundness in form of a microporosity, caused by the shrinkage phenomena, is predicted. The vast majority of publications in this field concerns shrinkage and feeding phenomena in the cast steel castings – these are the alloys, in which parallel expansion phenomenon does not occur as in the cast irons (graphite crystallization. The paper, basing on the simulation-experimental studies, presents problems of usability of a classic, definition-based approach to the Niyama criterion for the cast iron castings, especially of greater massiveness, for prediction of presence of zones of dispersed porosity, with relation to predictions of the shrinkage type defects. The graphite expansion and its influence on shrinkage compensation during solidification of eutectic is also discussed.

  6. Evidence for the criterion validity and clinical utility of the Pathological Narcissism Inventory

    Science.gov (United States)

    Thomas, Katherine M.; Wright, Aidan G.C.; Lukowitsky, Mark R.; Donnellan, M. Brent; Hopwood, Christopher J.

    2012-01-01

    In this study we evaluated aspects of criterion validity and clinical utility of the grandiosity and vulnerability components of the Pathological Narcissism Inventory (PNI) using two undergraduate samples (Ns = 299, 500). Criterion validity was assessed by evaluating the correlations of narcissistic grandiosity and narcissistic vulnerability with established indices of normal personality traits, psychopathology and clinical concerns, and pathological personality traits. Overall, the pattern of correlations supported the convergent and discriminate validity of grandiose and vulnerable conceptualizations of pathological narcissism as measured by the PNI. Clinical utility was assessed by evaluating the extent to which clinicians without specific training in pathological narcissism as well as clinicians with expertise in pathological narcissism could accurately predict the correlates of PNI grandiosity and vulnerability with normal and pathological personality traits and psychopathology. The rcontrast-cv coefficient (Westen & Rosenthal, 2003) provided a global index of accuracy in clinicians’ predictions that was more fully elaborated by examining systematic discrepancies across groups. Overall, novice and expert clinicians were generally able to predict criterion correlations, with some exceptions (e.g., counter to predictions, pathological narcissism was negatively associated with treatment resistance). These results provide further evidence regarding the validity and utility of the narcissistic grandiosity and narcissistic vulnerability constructs as measured by the PNI. PMID:22315481

  7. A Combined Intensity and Gradient-Based Similarity Criterion for Interindividual SPECT Brain Scan Registration

    Directory of Open Access Journals (Sweden)

    Bengtsson Ewert

    2003-01-01

    Full Text Available An evaluation of a new similarity criterion for interindividual image registration is presented. The proposed criterion combines intensity and gradient information from the images to achieve a more robust and accurate registration. It builds on a combination of the normalised mutual information (NMI cost function and a gradient-weighting function, calculated from gradient magnitude and relative gradient angle values from the images. An investigation was made to determine the best settings for the number of bins in the NMI joint histograms, subsampling, and smoothing of the images prior to the registration. The new method was compared with the NMI and correlation-coefficient (CC criterions for interindividual SPECT image registration. Two different validation tests were performed, based on the displacement of voxels inside the brain relative to their estimated true positions after registration. The results show that the registration quality was improved when compared with the NMI and CC measures. The actual improvements, in one of the tests, were in the order of 30-40% for the mean voxel displacement error measured within 20 different SPECT images. A conclusion from the studies is that the new similarity measure significantly improves the registration quality, compared with the NMI and CC similarity measures.

  8. Experiments and modeling of ballistic penetration using an energy failure criterion

    Directory of Open Access Journals (Sweden)

    Dolinski M.

    2015-01-01

    Full Text Available One of the most intricate problems in terminal ballistics is the physics underlying penetration and perforation. Several penetration modes are well identified, such as petalling, plugging, spall failure and fragmentation (Sedgwick, 1968. In most cases, the final target failure will combine those modes. Some of the failure modes can be due to brittle material behavior, but penetration of ductile targets by blunt projectiles, involving plugging in particular, is caused by excessive localized plasticity, with emphasis on adiabatic shear banding (ASB. Among the theories regarding the onset of ASB, new evidence was recently brought by Rittel et al. (2006, according to whom shear bands initiate as a result of dynamic recrystallization (DRX, a local softening mechanism driven by the stored energy of cold work. As such, ASB formation results from microstructural transformations, rather than from thermal softening. In our previous work (Dolinski et al., 2010, a failure criterion based on plastic strain energy density was presented and applied to model four different classical examples of dynamic failure involving ASB formation. According to this criterion, a material point starts to fail when the total plastic strain energy density reaches a critical value. Thereafter, the strength of the element decreases gradually to zero to mimic the actual material mechanical behavior. The goal of this paper is to present a new combined experimental-numerical study of ballistic penetration and perforation, using the above-mentioned failure criterion. Careful experiments are carried out using a single combination of AISI 4340 FSP projectiles and 25[mm] thick RHA steel plates, while the impact velocity, and hence the imparted damage, are systematically varied. We show that our failure model, which includes only one adjustable parameter in this present work, can faithfully reproduce each of the experiments without any further adjustment. Moreover, it is shown that the

  9. Utility of ultrasound for body fat assessment: validity and reliability compared to a multicompartment criterion.

    Science.gov (United States)

    Smith-Ryan, Abbie E; Blue, Malia N M; Trexler, Eric T; Hirsch, Katie R

    2018-03-01

    Measurement of body composition to assess health risk and prevention is expanding. Accurate portable techniques are needed to facilitate use in clinical settings. This study evaluated the accuracy and repeatability of a portable ultrasound (US) in comparison with a four-compartment criterion for per cent body fat (%Fat) in overweight/obese adults. Fifty-one participants (mean ± SD; age: 37·2 ± 11·3 years; BMI: 31·6 ± 5·2 kg m-2 ) were measured for %Fat using US (GE Logiq-e) and skinfolds. A subset of 36 participants completed a second day of the same measurements, to determine reliability. US and skinfold %Fat were calculated using the seven-site Jackson-Pollock equation. The Wang 4C model was used as the criterion method for %Fat. Compared to a gold standard criterion, US %Fat (36·4 ± 11·8%; P = 0·001; standard error of estimate [SEE] = 3·5%) was significantly higher than the criterion (33·0 ± 8·0%), but not different than skinfolds (35·3 ± 5·9%; P = 0·836; SEE = 4·5%). US resulted in good reliability, with no significant differences from Day 1 (39·95 ± 15·37%) to Day 2 (40·01 ± 15·42%). Relative consistency was 0·96, and standard error of measure was 0·94%. Although US overpredicted %Fat compared to the criterion, a moderate SEE for US is suggestive of a practical assessment tool in overweight individuals. %Fat differences reported from these field-based techniques are less than reported by other single-measurement laboratory methods and therefore may have utility in a clinical setting. This technique may also accurately track changes. © 2016 Scandinavian Society of Clinical Physiology and Nuclear Medicine. Published by John Wiley & Sons Ltd.

  10. Distinct anatomical correlates of discriminability and criterion setting in verbal recognition memory revealed by lesion-symptom mapping.

    Science.gov (United States)

    Biesbroek, J Matthijs; van Zandvoort, Martine J E; Kappelle, L Jaap; Schoo, Linda; Kuijf, Hugo J; Velthuis, Birgitta K; Biessels, Geert Jan; Postma, Albert

    2015-04-01

    Recognition memory, that is, the ability to judge whether an item has been previously encountered in a particular context, depends on two factors: discriminability and criterion setting. Discriminability draws on memory processes while criterion setting (i.e., the application of a threshold resulting in a yes/no response) is regarded as a process of cognitive control. Discriminability and criterion setting are assumed to draw on distinct anatomical structures, but definite evidence for this assumption is lacking. We applied voxel-based and region of interest-based lesion-symptom mapping to 83 patients in the acute phase of ischemic stroke to determine the anatomical correlates of discriminability and criterion setting in verbal recognition memory. Recognition memory was measured with the Rey Auditory Verbal Learning Test. Signal-detection theory was used to calculate measures for discriminability and criterion setting. Lesion-symptom mapping revealed that discriminability draws on left medial temporal and temporo-occipital structures, both thalami and the right hippocampus, while criterion setting draws on the right inferior frontal gyrus. Lesions in the right inferior frontal gyrus were associated with liberal response bias. These findings indicate that discriminability and criterion setting indeed depend on distinct anatomical structures and provide new insights in the anatomical correlates of these cognitive processes that underlie verbal recognition memory. © 2014 Wiley Periodicals, Inc.

  11. Evaluation of a Consensus-Based Criterion Standard Definition of Trauma Center Need for Use in Field Triage Research.

    Science.gov (United States)

    Willenbring, Brian D; Lerner, E Brooke; Brasel, Karen; Cushman, Jeremy T; Guse, Clare E; Shah, Manish N; Swor, Robert

    2016-01-01

    Research on field triage of injured patients is limited by the lack of a widely used criterion standard for defining trauma center need. Injury Severity Score (ISS) >15 has been a commonly used outcome measure in research for determining trauma center need that has never been validated. A multidisciplinary team recently published a consensus-based criterion standard definition of trauma center need, but this measure has not yet been validated. The objective was to determine if the consensus-based criterion standard can be obtained by medical record review and compare patients identified as needing a trauma center by the consensus-based criterion standard vs. ISS >15. A subanalysis of data collected during a 2-year prospective cohort study of 4,528 adult trauma patients transported by EMS to a single trauma center was conducted. These data included ICD-9-CM codes, treatment times, and other patient care data. Presence of the consensus-based criterion standard was determined for each patient. ISS was calculated based on ICD-9-CM codes assigned for billing. The consensus-based criterion standard could be applied to 4,471 (98.7%) cases. ISS could be determined for 4,506 (99.5%) cases. Based on an ISS >15, 8.9% of cases were identified as needing a trauma center. Of those, only 48.2% met the consensus-based criterion standard. Almost all patients that did not meet the consensus-based criterion standard, but had an ISS >15 were diagnosed with chest (rib fractures (100/205 cases)/pneumothorax (57/205 cases), closed head (without surgical intervention 88/205 cases), vertebral (without spinal cord injury 45/205 cases), and/or extremity injuries (39/205 cases). There were 4,053 cases with an ISS <15. 5.0% of those with an ISS <15 met the consensus-based criterion standard with the majority requiring surgery (139/203 cases) or a blood transfusion (60/203 cases). The kappa coefficient of agreement for ISS and the consensus-based criterion standard was 0.43. We determined that

  12. Construct and criterion-related validation of nutrient profiling models: A systematic review of the literature.

    Science.gov (United States)

    Cooper, Sheri L; Pelly, Fiona E; Lowe, John B

    2016-05-01

    Nutrient profiling (NP) is defined as the science of ranking foods according to their nutritional composition for the purpose of preventing disease or promoting health. The application of NP is ultimately to assist consumers to make healthier food choices, and thus provide a cost effective public health strategy to reduce the incidence of diet-related chronic disease. To our knowledge, no review has assessed the evidence to confirm the validity of NP models. We conducted a systematic review to investigate the construct and criterion-related validity of NP models in ranking food according to their nutritional composition for the purpose of preventing disease and promoting health. We searched peer-reviewed research published to 30 June 2015 and used PUBMED, Global Health (CABI), and SCOPUS databases. Within study bias was assessed using an adapted version of the QUADAS-2 (Quality Assessment of Diagnostic Accuracy Studies -2) tool for all diagnostic studies and the Cochrane Collaboration's Risk of Bias tool for all non-diagnostic studies. The GRADE (Grades of Recommendation, Assessment, Development, and Evaluation) approach was used to guide our judgement of the quality of the body of evidence for each outcome measure. From a total of 83 studies, 69 confirmed the construct validity of NP models; however most of these studies contained methodological weaknesses. Six studies used objective external measures to confirm the criterion-related validity of NP models; which inherently improved quality. The overall quality of evidence on the accuracy of NP models was judged to be very low to moderate using the GRADE approach. Many carefully designed studies to establish both construct and criterion-related validity are necessary to authenticate the application of NP models and provide the evidence to support the current definition of NP. Copyright © 2016 Elsevier Ltd. All rights reserved.

  13. A thermomechanical criterion for hot cracking during electron beam welding of CuCrZr alloy

    Energy Technology Data Exchange (ETDEWEB)

    Wisniewski, J.; Pilvin, R. [CEA Saclay, Dept. Modelisation de Systemes et Structures (DEN/DANS/DM2S/SEMT/LTA), 91 - Gif sur Yvette (France); Carron, D. [Universite de Bretagne-Sud, LET2E (EA3373), 56 - Lorient (France); Ayrault, D. [CEA Saclay (LTA), 91 - Gif-sur-Yvette (France); Durocher, A. [Association Euratom-CEA Cadarache (DSM/DRFC), 13 - Saint-Paul-lez-Durance (France). Dept. de Recherches sur la Fusion Controlee; Primaux, F.; Cauwe, B. [Le Bronze Industriel, 51 - Suippes (France)

    2007-07-01

    Full text of publication follows: Due to its good thermomechanical and thermophysical properties, precipitation hardened CuCrZr alloy is used for structural components in fusion experiments such as Tore Supra, JET, W7X and will find also application in the thermonuclear fusion reactor ITER. In Tore Supra (CEA Cadarache, France) this material is typically used for heat sink structures of plasma facing components. The experience feedback showed that the CuCrZr alloy was very sensitive to the hot tearing phenomenon during electron beam welding, leading to defects in and/or near the melted zone. The objective of the project under consideration is to propose a hot tearing criterion by mean of numerical simulations, in order to define a welding acceptance test which could be applied to the material, delivered from different manufacturers. In order to characterize the hot tearing phenomenon, a laboratory test, inspired by the Shibahara's experiment, is used. An electron beam welding seam is performed on a thin rectangular plate, which is instrumented with thermocouples while a CCD camera allows recording of eventual cracking defects during welding. The image correlation method permits to determine the displacement field in the solidified welding seam as well as in the non melted zone. In order to identify the hot tearing criterion due to the welding process, the stress and strain state in the material during the laboratory test is calculated with a Lagrangian thermomechanical finite element simulation. For high temperatures, the alloy viscosity is taken into account in order to identify an elasto-viscoplastic behaviour law. Thermomechanical experiments are performed with a Gleeble physical simulator. A thermomechanical criterion for the initiation of hot tearing during electron beam welding of a quenched and aged CuCr1Zr alloy (DIN 17672 standard) has been identified. (authors)

  14. The effect of using a robust optimality criterion in model based adaptive optimization.

    Science.gov (United States)

    Strömberg, Eric A; Hooker, Andrew C

    2017-08-01

    Optimizing designs using robust (global) optimality criteria has been shown to be a more flexible approach compared to using local optimality criteria. Additionally, model based adaptive optimal design (MBAOD) may be less sensitive to misspecification in the prior information available at the design stage. In this work, we investigate the influence of using a local (lnD) or a robust (ELD) optimality criterion for a MBAOD of a simulated dose optimization study, for rich and sparse sampling schedules. A stopping criterion for accurate effect prediction is constructed to determine the endpoint of the MBAOD by minimizing the expected uncertainty in the effect response of the typical individual. 50 iterations of the MBAODs were run using the MBAOD R-package, with the concentration from a one-compartment first-order absorption pharmacokinetic model driving the population effect response in a sigmoidal EMAX pharmacodynamics model. The initial cohort consisted of eight individuals in two groups and each additional cohort added two individuals receiving a dose optimized as a discrete covariate. The MBAOD designs using lnD and ELD optimality with misspecified initial model parameters were compared by evaluating the efficiency relative to an lnD-optimal design based on the true parameter values. For the explored example model, the MBAOD using ELD-optimal designs converged quicker to the theoretically optimal lnD-optimal design based on the true parameters for both sampling schedules. Thus, using a robust optimality criterion in MBAODs could reduce the number of adaptations required and improve the practicality of adaptive trials using optimal design.

  15. An existential criterion for normal and abnormal personality in the works of Erich Fromm.

    Directory of Open Access Journals (Sweden)

    Kapustin S.A.

    2015-06-01

    Full Text Available This is the first of four articles scheduled for publication in this journal on the position people with normal and abnormal personalities take in regard to so-called existential dichotomies. The main objective of this article is to propose a new, existential criterion for normal and abnormal personality implicitly present in the works of Erich Fromm. According to this criterion, normal and abnormal personalities are determined, first, by special features of the content of their position regarding existential dichotomies, and, second, by particular aspects of the formation of this position. Such dichotomies, entitatively existent in all human life, are inherent, two-alternative contradictions. The position of a normal personality in its content orients one toward a contradictious predetermination of life in the form of existential dichotomies and the necessity of searching for compromise in resolving these dichotomies. This position is created on a rational basis with the person’s active participation. The position of an abnormal personality in its content subjectively denies a contradictious predetermination of life in the form of existential dichotomies and orients one toward a consistent, noncompetitive, and, as a consequence, one-sided way of life that doesn’t include self-determination. This position is imposed by other people on an irrational basis. Abnormal personality interpreted like this is one of the most important factors influencing the development of various kinds of psychological problems and mental disorders — primarily, neurosis. In the following three articles it will be shown that this criterion is also implicitly present in the theories of personality devised by Sigmund Freud, Alfred Adler, Carl Jung, Carl Rogers, and Viktor Frankl.

  16. On the Performance of Principal Component Liu-Type Estimator under the Mean Square Error Criterion

    Directory of Open Access Journals (Sweden)

    Jibo Wu

    2013-01-01

    Full Text Available Wu (2013 proposed an estimator, principal component Liu-type estimator, to overcome multicollinearity. This estimator is a general estimator which includes ordinary least squares estimator, principal component regression estimator, ridge estimator, Liu estimator, Liu-type estimator, r-k class estimator, and r-d class estimator. In this paper, firstly we use a new method to propose the principal component Liu-type estimator; then we study the superior of the new estimator by using the scalar mean squares error criterion. Finally, we give a numerical example to show the theoretical results.

  17. Universal criterion and phase diagram for switching a magnetic vortex core in soft magnetic nanodots

    OpenAIRE

    Lee, Ki-Suk; Kim, Sang-Koog; Yu, Young-Sang; Choi, Youn-Seok; Guslienko, Konstantin Yu.; Jung, Hyunsung; Fischer, Peter

    2008-01-01

    The universal criterion for ultrafast vortex-core switching between the up- and down-core bistates in soft magnetic nanodots was investigated by micromagnetic simulations along with analytical calculations. Vortex-core switching occurs whenever the velocity of vortex-core motion reaches the critical velocity that is expressed as (e.g. m/s for Permalloy), where Aex is the exchange stiffness, and is the gyromagnetic ratio. On the basis of the above results, phase diagrams for the vortex-core sw...

  18. Generalized Empirical Likelihood-Based Focused Information Criterion and Model Averaging

    Directory of Open Access Journals (Sweden)

    Naoya Sueishi

    2013-07-01

    Full Text Available This paper develops model selection and averaging methods for moment restriction models. We first propose a focused information criterion based on the generalized empirical likelihood estimator. We address the issue of selecting an optimal model, rather than a correct model, for estimating a specific parameter of interest. Then, this study investigates a generalized empirical likelihood-based model averaging estimator that minimizes the asymptotic mean squared error. A simulation study suggests that our averaging estimator can be a useful alternative to existing post-selection estimators.

  19. Mean Field Theory, Ginzburg Criterion, and Marginal Dimensionality of Phase-Transitions

    DEFF Research Database (Denmark)

    Als-Nielsen, Jens Aage; Birgenau, R. J.

    1977-01-01

    By applying a real space version of the Ginzburg criterion, the role of fluctuations and thence the self‐consistency of mean field theory are assessed in a simple fashion for a variety of phase transitions. It is shown that in using this approach the concept of ’’marginal dimensionality’’ emerges...... in a natural way. For example, it is shown that for many homogeneous structural transformations the marginal dimensionality is two, so that mean field theory will be valid for real three‐dimensional systems. It is suggested that this simple self‐consistent approach to Landau theory should be incorporated...... in the teaching of elementary phase transition phenomena....

  20. Sex-Typical and Sex-Atypical Interests of Kuder Occupational Interest Survey Criterion Groups: Implications for Counseling.

    Science.gov (United States)

    Diamond, Esther E.

    1981-01-01

    The degree of overlap between scores on male-normed and female-normed scales for Kuder Occupational Interest Survey criterion groups was studied. Results provide clues to sex-typical and sex-atypical interests of these groups. (Author)

  1. A Missing Data Approach to Correct for Direct and Indirect Range Restrictions with a Dichotomous Criterion: A Simulation Study

    National Research Council Canada - National Science Library

    Pfaffel, Andreas; Kollmayer, Marlene; Schober, Barbara; Spiel, Christiane

    2016-01-01

    ... only. This so-called range restriction problem causes biased population estimates. Correction methods for direct and indirect range restriction scenarios have widely studied for continuous criterion variables but not for dichotomous ones...

  2. The Establishment of Surface Roughness as Failure Criterion of Al–Li Alloy Stretch-Forming Process

    National Research Council Canada - National Science Library

    Feng, Jing-Wen; Zhan, Li-Hua; Yang, Ying-Ge

    2016-01-01

    ... characterizations on the basis of the precise measurement of stretch-forming surface roughness and establishes the critical criterion for the occurrence of orange peel surface defects in the stretch-forming...

  3. The Influence of Rock Properties and Size into Strength Criteria: A Proposed Criterion for Soft Rock Masses

    Directory of Open Access Journals (Sweden)

    Agustawijaya D.S.

    2011-01-01

    Full Text Available A new modified strength criterion for soft rock masses is proposed in this paper in order to provide a suitable estimation for soft rock mass strength. The new criterion is based upon the current compression test data of soft materials of over 150 samples, and available published data of soft rock strength. It is shown that the proposed criterion estimates reasonable values of soft rock mass strength. Rock properties and size contribute significantly into the strength, represented by friction angle and unconfined compressive strength. Examples exercised reveal that the structure of soft rock masses takes a dominant part in controlling the strength, which then determines the modelled strength of soft rock masses. The results also show that the strength of the proposed equation could relatively be higher three times than the strength of the Hoek-Brown criterion for a massive soft rock mass.

  4. An existential criterion of normal and abnormal personality in the works of Carl Jung and Carl Rogers

    OpenAIRE

    Kapustin, Sergey A.

    2016-01-01

    This article is the third in a series of four articles scheduled for publication in this journal. In the first article (Kapustin, 2015a) I proposed a description of a new so-called existential criterion of normal and abnormal personality that is implicitly present in the works of Erich Fromm. According to this criterion, normal and abnormal personalities are determined, first, by special features of the content of their position regarding existential dichotomies that are natural to human bein...

  5. Sensitivity of radiographic changes of hand and foot joints as a diagnostic criterion in patients with rheumatoid arthritis

    Energy Technology Data Exchange (ETDEWEB)

    Okubo, S.; Lehtinen, K.; Isomaeki, H. (Rheumatism Foundation Hospital, Heinola (Finland))

    1992-01-01

    In order to evaluate the sensitivity of radiographic changes in both hand and foot joints as a diagnostic criterion, we have investigated radiographs of patients with seropositive RA in the early stage of the disease. In our study, the inclusion of radiographic changes in foot joints improved the sensitivity of the radiographic criterion by 16% at the first visit and 20% after three years. (4 refs., 3 tabs).

  6. DATA ANALYSIS BY FORMAL METHODS OF ESTIMATION OF INDEXES OF RATING CRITERION IN PROCESS OF ACCUMULATION OF DATA ABOUT WORKING OF THE TEACHING STAFF

    Directory of Open Access Journals (Sweden)

    Alexey E. Fedoseev

    2014-01-01

    Full Text Available The article considers the development of formal methods of assessing the rating criterion exponents. The article deals with the mathematical model, which allows to connect together quantitative rating criterion characteristics, measured in various scales, with intuitive idea of them. The solution to the problem of rating criterion estimation is proposed.

  7. Criterion and Divergent Validity of the Sexual Minority Adolescent Stress Inventory

    Directory of Open Access Journals (Sweden)

    Jeremy T. Goldbach

    2017-11-01

    Full Text Available Sexual minority adolescents (SMA consistently report health disparities compared to their heterosexual counterparts, yet the underlying mechanisms of these negative health outcomes remain unclear. The predominant explanatory model is the minority stress theory; however, this model was developed largely with adults, and no valid and comprehensive measure of minority stress has been developed for adolescents. The present study validated a newly developed instrument to measure minority stress among racially and ethnically diverse SMA. A sample of 346 SMA aged 14–17 was recruited and surveyed between February 2015 and July 2016. The focal measure of interest was the 64-item, 11-factor Sexual Minority Adolescent Stress Inventory (SMASI developed in the initial phase of this study. Criterion validation measures included measures of depressive symptoms, suicidality and self-harm, youth problem behaviors, and substance use; the general Adolescent Stress Questionnaire (ASQ was included as a measure of divergent validity. Analyses included Pearson and tetrachoric correlations to establish criterion and divergent validity and structural equation modeling to assess the explanatory utility of the SMASI relative to the ASQ. SMASI scores were significantly associated with all outcomes but only moderately associated with the ASQ (r = −0.13 to 0.51. Analyses revealed significant associations of a latent minority stress variable with both proximal and distal health outcomes beyond the variation explained by general stress. Results show that the SMASI is the first instrument to validly measure minority stress among SMA.

  8. Criterion validity of a functional cognitive task in patients with severe traumatic brain injury.

    Science.gov (United States)

    LeBlanc, Joanne; de Guise, Elaine; Lamoureux, Julie; Meyer, Kim; Duplantie, Jennifer; Thomas, Harle; Abouassaly, Michel; Champoux, Marie-Claude; Couturier, Céline; Lin, Howell; Lu, Lucy; Robinson, Cathlyn; Roger, Eric; Maleki, Mohammed; Feyz, Mitra

    2012-01-01

    To verify criterion validity of measures from a functional cognitive task (FCT) carried out with patients with severe traumatic brain injury (sTBI) at 2-5 years post-injury. Forty-six patients with sTBI took part in a long-term outcome study where the FCT and the Neurobehavioural Rating Scale-Revised (NBRS-R) were administered and the FIM™ instrument was rated. The FCT is a telephone information gathering task for evaluating functional cognitive skills. Ten of 16 measures of the FCT were significantly correlated with similar or related concepts from the NBRS-R. The FIM™ cognitive score and the individual items of this score were significantly correlated with 13 of the FCT measures and with the percentage of amount of information gathered. Internal consistency was good for 13 of 16 measures. Overall, patients generally had mild difficulty on the FCT concepts. The FCT can be used with patients with sTBI to evaluate certain aspects of functional cognition. It has good criterion validity and internal consistency, but additional research is required to further measure reliability and its applicability to other severity of TBI and to other phases of recovery.

  9. Can I retake it? Exploring subgroup differences and criterion-related validity in promotion retesting.

    Science.gov (United States)

    Van Iddekinge, Chad H; Morgeson, Frederick P; Schleicher, Deidra J; Campion, Michael A

    2011-09-01

    Despite recent interest in the practice of allowing job applicants to retest, surprisingly little is known about how retesting affects 2 of the most critical factors on which staffing procedures are evaluated: subgroup differences and criterion-related validity. We examined these important issues in a sample of internal candidates who completed a job-knowledge test for a within-job promotion. This was a useful context for these questions because we had job-performance data on all candidates (N = 403), regardless of whether they passed or failed the promotion test (i.e., there was no direct range restriction). We found that retest effects varied by subgroup, such that females and younger candidates improved more upon retesting than did males and older candidates. There also was some evidence that Black candidates did not improve as much as did candidates from other racial groups. In addition, among candidates who retested, their retest scores were somewhat better predictors of subsequent job performance than were their initial test scores (rs = .38 vs. .27). The overall results suggest that retesting does not negatively affect criterion-related validity and may even enhance it. Furthermore, retesting may reduce the likelihood of adverse impact against some subgroups (e.g., female candidates) but increase the likelihood of adverse impact against other subgroups (e.g., older candidates). PsycINFO Database Record (c) 2011 APA, all rights reserved

  10. Reliability and criterion-related validity of a new repeated agility test.

    Science.gov (United States)

    Fessi, M S; Makni, E; Jemni, M; Elloumi, M; Chamari, K; Nabli, M A; Padulo, J; Moalla, W

    2016-06-01

    The study aimed to assess the reliability and the criterion-related validity of a new repeated sprint T-test (RSTT) that includes intense multidirectional intermittent efforts. The RSTT consisted of 7 maximal repeated executions of the agility T-test with 25 s of passive recovery rest in between. Forty-five team sports players performed two RSTTs separated by 3 days to assess the reliability of best time (BT) and total time (TT) of the RSTT. The intra-class correlation coefficient analysis revealed a high relative reliability between test and retest for BT and TT (>0.90). The standard error of measurement (related to the RSTT were 0.09 s and 0.58 s, respectively. To check the criterion-related validity of the RSTT, players performed a repeated linear sprint (RLS) and a repeated sprint with changes of direction (RSCD). Significant correlations between the BT and TT of the RLS, RSCD and RSTT were observed (pvalid measure of the intermittent repeated sprint agility performance. As this ability is required in all team sports, it is suggested that team sports coaches, fitness coaches and sports scientists consider this test in their training follow-up.

  11. Criterion and convergent validity of the Montreal cognitive assessment with screening and standardized neuropsychological testing.

    Science.gov (United States)

    Lam, Benjamin; Middleton, Laura E; Masellis, Mario; Stuss, Donald T; Harry, Robin D; Kiss, Alex; Black, Sandra E

    2013-12-01

    To compare the validity of the Montreal Cognitive Assessment (MoCA) with the criterion standard of standardized neuropsychological testing and to compare the convergent validity of the MoCA with that of existing screening tools and global measures of cognition. Cross-sectional observational study. Tertiary care hospital-based cognitive neurology subspecialty clinic. A convenience sample of 107 individuals with mild Alzheimer's disease (AD, n=75) or mild cognitive impairment (MCI, n=32) from the Sunnybrook Dementia Study. In addition to the MoCA, all participants completed the Mini-Mental State Examination (MMSE), the Mattis Dementia Rating Scale (DRS), and detailed neuropsychological testing. Convergent validity was supported, with MoCA scores correlating well with the MMSE (correlation coefficient (r)=0.66, Ptests and, in the case of memory (area under the receiver operating characteristic curve (AUC)=0.86), executive (AUC=0.79), and visuospatial function (AUC=0.79), being reasonably sensitive to impairment in those domains. The MoCA is a valid assessment of cognition that shows good agreement with existing screening tools and global measures (convergent validity) and was superior to the MMSE in this regard. The MoCA domain-specific subscores align with performance on more-detailed neuropsychological tests, suggesting not only good criterion validity for the MoCA, but also that it may be useful in guiding further neuropsychological testing. © 2013, Copyright the Authors Journal compilation © 2013, The American Geriatrics Society.

  12. Building a maintenance policy through a multi-criterion decision-making model

    Science.gov (United States)

    Faghihinia, Elahe; Mollaverdi, Naser

    2012-08-01

    A major competitive advantage of production and service systems is establishing a proper maintenance policy. Therefore, maintenance managers should make maintenance decisions that best fit their systems. Multi-criterion decision-making methods can take into account a number of aspects associated with the competitiveness factors of a system. This paper presents a multi-criterion decision-aided maintenance model with three criteria that have more influence on decision making: reliability, maintenance cost, and maintenance downtime. The Bayesian approach has been applied to confront maintenance failure data shortage. Therefore, the model seeks to make the best compromise between these three criteria and establish replacement intervals using Preference Ranking Organization Method for Enrichment Evaluation (PROMETHEE II), integrating the Bayesian approach with regard to the preference of the decision maker to the problem. Finally, using a numerical application, the model has been illustrated, and for a visual realization and an illustrative sensitivity analysis, PROMETHEE GAIA (the visual interactive module) has been used. Use of PROMETHEE II and PROMETHEE GAIA has been made with Decision Lab software. A sensitivity analysis has been made to verify the robustness of certain parameters of the model.

  13. Electricity Consumption Forecasting Scheme via Improved LSSVM with Maximum Correntropy Criterion

    Directory of Open Access Journals (Sweden)

    Jiandong Duan

    2018-02-01

    Full Text Available In recent years, with the deepening of China’s electricity sales side reform and electricity market opening up gradually, the forecasting of electricity consumption (FoEC becomes an extremely important technique for the electricity market. At present, how to forecast the electricity accurately and make an evaluation of results scientifically are still key research topics. In this paper, we propose a novel prediction scheme based on the least-square support vector machine (LSSVM model with a maximum correntropy criterion (MCC to forecast the electricity consumption (EC. Firstly, the electricity characteristics of various industries are analyzed to determine the factors that mainly affect the changes in electricity, such as the gross domestic product (GDP, temperature, and so on. Secondly, according to the statistics of the status quo of the small sample data, the LSSVM model is employed as the prediction model. In order to optimize the parameters of the LSSVM model, we further use the local similarity function MCC as the evaluation criterion. Thirdly, we employ the K-fold cross-validation and grid searching methods to improve the learning ability. In the experiments, we have used the EC data of Shaanxi Province in China to evaluate the proposed prediction scheme, and the results show that the proposed prediction scheme outperforms the method based on the traditional LSSVM model.

  14. Montreal-Toulouse Language Assessment Battery: evidence of criterion validity from patients with aphasia.

    Science.gov (United States)

    Pagliarin, Karina Carlesso; Ortiz, Karin Zazo; Barreto, Simone dos Santos; Pimenta Parente, Maria Alice de Mattos; Nespoulous, Jean-Luc; Joanette, Yves; Fonseca, Rochele Paz

    2015-10-15

    The Montreal-Toulouse Language Assessment Battery - Brazilian version (MTL-BR) provides a general description of language processing and related components in adults with brain injury. The present study aimed at verifying the criterion-related validity of the Montreal-Toulouse Language Assessment Battery - Brazilian version (MTL-BR) by assessing its ability to discriminate between individuals with unilateral brain damage with and without aphasia. The investigation was carried out in a Brazilian community-based sample of 104 adults, divided into four groups: 26 participants with left hemisphere damage (LHD) with aphasia, 25 participants with right hemisphere damage (RHD), 28 with LHD non-aphasic, and 25 healthy adults. There were significant differences between patients with aphasia and the other groups on most total and subtotal scores on MTL-BR tasks. The results showed strong criterion-related validity evidence for the MTL-BR Battery, and provided important information regarding hemispheric specialization and interhemispheric cooperation. Future research is required to search for additional evidence of sensitivity, specificity and validity of the MTL-BR in samples with different types of aphasia and degrees of language impairment. Copyright © 2015 Elsevier B.V. All rights reserved.

  15. A channel-selection criterion for suppressing reverberation in cochlear implants

    Science.gov (United States)

    Kokkinakis, Kostas; Hazrati, Oldooz; Loizou, Philipos C.

    2011-01-01

    Little is known about the extent to which reverberation affects speech intelligibility by cochlear implant (CI) listeners. Experiment 1 assessed CI users’ performance using Institute of Electrical and Electronics Engineers (IEEE) sentences corrupted with varying degrees of reverberation. Reverberation times of 0.30, 0.60, 0.80, and 1.0 s were used. Results indicated that for all subjects tested, speech intelligibility decreased exponentially with an increase in reverberation time. A decaying-exponential model provided an excellent fit to the data. Experiment 2 evaluated (offline) a speech coding strategy for reverberation suppression using a channel-selection criterion based on the signal-to-reverberant ratio (SRR) of individual frequency channels. The SRR reflects implicitly the ratio of the energies of the signal originating from the early (and direct) reflections and the signal originating from the late reflections. Channels with SRR larger than a preset threshold were selected, while channels with SRR smaller than the threshold were zeroed out. Results in a highly reverberant scenario indicated that the proposed strategy led to substantial gains (over 60 percentage points) in speech intelligibility over the subjects’ daily strategy. Further analysis indicated that the proposed channel-selection criterion reduces the temporal envelope smearing effects introduced by reverberation and also diminishes the self-masking effects responsible for flattened formants. PMID:21568424

  16. Locally linear representation Fisher criterion based tumor gene expressive data classification.

    Science.gov (United States)

    Li, Bo; Tian, Bei-Bei; Zhang, Xiao-Long; Zhang, Xiao-Ping

    2014-10-01

    Tumor gene expressive data are characterized by a large amount of genes with only a small amount of observations, which always appear with high dimensionality. So it is necessary to reduce the dimensionality before identifying their genre. In this paper, a discriminant manifold learning method, named locally linear representation Fisher criterion (LLRFC), is applied to extract features from tumor gene expressive data. In LLRFC, an inter-class graph and an intra-class graph are constructed based on their genre information, where any tumor gene expressive data in the inter-class graph should select k nearest neighbors with different class labels and in the intra-class graph the k nearest neighbors for any tumor gene expressive data must be sampled from those with the same class. And then the locally least linear reconstruction is introduced to optimize the corresponding weights in both graphs. Moreover, a Fisher criterion is modeled to explore a low dimensional subspace where the reconstruction errors in the inter-class graph can be maximized and the reconstruction errors in the intra-class graph can be minimized, simultaneously. Experiments on some benchmark tumor gene expressive data have been conducted with some related algorithms, by which the proposed LLRFC has been validated to be efficient. Copyright © 2014 Elsevier Ltd. All rights reserved.

  17. Determine the optimal carrier selection for a logistics network based on multi-commodity reliability criterion

    Science.gov (United States)

    Lin, Yi-Kuei; Yeh, Cheng-Ta

    2013-05-01

    From the perspective of supply chain management, the selected carrier plays an important role in freight delivery. This article proposes a new criterion of multi-commodity reliability and optimises the carrier selection based on such a criterion for logistics networks with routes and nodes, over which multiple commodities are delivered. Carrier selection concerns the selection of exactly one carrier to deliver freight on each route. The capacity of each carrier has several available values associated with a probability distribution, since some of a carrier's capacity may be reserved for various orders. Therefore, the logistics network, given any carrier selection, is a multi-commodity multi-state logistics network. Multi-commodity reliability is defined as a probability that the logistics network can satisfy a customer's demand for various commodities, and is a performance indicator for freight delivery. To solve this problem, this study proposes an optimisation algorithm that integrates genetic algorithm, minimal paths and Recursive Sum of Disjoint Products. A practical example in which multi-sized LCD monitors are delivered from China to Germany is considered to illustrate the solution procedure.

  18. The Frequentist Information Criterion (FIC): The unification of information-based and frequentist inference

    CERN Document Server

    LaMont, Colin H

    2015-01-01

    The failure of the information-based Akaike Information Criterion (AIC) in the context of singular models can be rectified by the definition of a Frequentist Information Criterion (FIC). FIC applies a frequentist approximation to the computation of the model complexity, which can be estimated analytically in many contexts. Like AIC, FIC can be understood as an unbiased estimator of the model predictive performance and is therefore identical to AIC for regular models in the large-observation-number limit ($N\\rightarrow \\infty$) . In the presence of unidentifiable parameters, the complexity exhibits a more general, non-AIC-like scaling ($\\gg N^0$). For instance, both BIC-like ($\\propto\\log N$) and Hannan-Quinn-like ($\\propto \\log \\log N$) scaling with observation number $N$ are observed. Unlike the Bayesian model selection approach, FIC is free from {\\it ad hoc} prior probability distributions and appears to be widely applicable to model selection problems. Finally we demonstrate that FIC (information-based inf...

  19. The Success of Linear Bootstrapping Models: Decision Domain-, Expertise-, and Criterion-Specific Meta-Analysis

    Science.gov (United States)

    Kaufmann, Esther; Wittmann, Werner W.

    2016-01-01

    The success of bootstrapping or replacing a human judge with a model (e.g., an equation) has been demonstrated in Paul Meehl’s (1954) seminal work and bolstered by the results of several meta-analyses. To date, however, analyses considering different types of meta-analyses as well as the potential dependence of bootstrapping success on the decision domain, the level of expertise of the human judge, and the criterion for what constitutes an accurate decision have been missing from the literature. In this study, we addressed these research gaps by conducting a meta-analysis of lens model studies. We compared the results of a traditional (bare-bones) meta-analysis with findings of a meta-analysis of the success of bootstrap models corrected for various methodological artifacts. In line with previous studies, we found that bootstrapping was more successful than human judgment. Furthermore, bootstrapping was more successful in studies with an objective decision criterion than in studies with subjective or test score criteria. We did not find clear evidence that the success of bootstrapping depended on the decision domain (e.g., education or medicine) or on the judge’s level of expertise (novice or expert). Correction of methodological artifacts increased the estimated success of bootstrapping, suggesting that previous analyses without artifact correction (i.e., traditional meta-analyses) may have underestimated the value of bootstrapping models. PMID:27327085

  20. Suboptimal criterion setting in a perceptual choice task with asymmetric reinforcement.

    Science.gov (United States)

    Stüttgen, Maik C; Kasties, Nils; Lengersdorf, Daniel; Starosta, Sarah; Güntürkün, Onur; Jäkel, Frank

    2013-06-01

    Performance on psychophysical tasks is influenced by a variety of non-sensory factors, most notably the magnitude or probability of reinforcement following correct responses. When reinforcement probability is unequal for hits and correct rejections, signal detection theory specifies an optimal decision criterion which maximizes the number of reinforcers. We subjected pigeons to a task in which six different stimuli (shades of gray) had to be assigned to one of two categories. Animals were confronted with asymmetric reinforcement schedules in which correct responses to five of the stimuli were reinforced with a probability of 0.5, while correct responses to the remaining stimulus were extinguished. The subjects' resultant choice probabilities clearly deviated from those predicted by a maximization account. More specifically, the magnitude of the choice bias increased with the distance of the to-be-extinguished stimulus to the category boundary, a pattern opposite to that posited by maximization. The present and a previous set of results in which animals performed optimally can be explained by a simple choice mechanism in which a variable decision criterion is constantly updated according to a leaky integration of incomes attained from both response options. Copyright © 2013 Elsevier B.V. All rights reserved.

  1. MODIFIED CHOKE FLOW CRITERION FOR THE TWO-PHASE TWO-FLUID MODEL

    Energy Technology Data Exchange (ETDEWEB)

    Suneet Singh; Vincent A. Mousseau

    2009-05-01

    A choked condition exists when mass flow rate becomes independent of the downstream conditions. In other words, no information can propagate in the upstream direction under this condition. The real part of the solution of the characteristic equation for the model represents velocity of the signal propagation and the imaginary part is the growth (or decay) rate of that signal. Therefore, if the real part of these eigenvalues is positive then no signal propagates in the upstream direction (choosing downstream direction to be the positive direction) resulting in the choke flow. In order to develop the choke criterion, a non-dimensional form of the characteristic equation is derived for the standard two-phase two-fluid model. The equation is in the terms of a slip Mach number Ms. It can be shown that the slip Mach number is small for many applications including nuclear reactor safety simulations. The eigenvalues of the characteristic equation are obtained as a power series expansion about the point Ms = 0. These eigenvalues are used to develop a choking criterion for the compressible two-phase flows.

  2. Human dignity in international policy documents: a useful criterion for public policy?

    Science.gov (United States)

    de Melo-Martín, Inmaculada

    2011-01-01

    Current developments in biomedicine are presenting us with difficult ethical decisions and raising complex policy questions about how to regulate these new developments. Particularly vexing for governments have been issues related to human embryo experimentation. Because some of the most promising biomedical developments, such as stem cell research and nuclear somatic transfer, involve such experimentation, several international bodies have drafted documents aimed to provide guidance to governments when developing biomedical science policy. Here I focus on two such documents: the Council of Europe's Convention for the Protection of Human Rights and Dignity of the Human Being and the Additional Protocol to the Convention for the Protection of Human Rights and Dignity of the Human Being. I argue that by using human dignity as a criterion to determine the permissibility of particular human embryo research practices, these documents cannot aid in identifying research that would be contrary to human dignity. Thus, they fail to guide public policy on embryo experimentation. Their use of human dignity as a criterion makes their task of offering guidance unfeasible because the concept as used in these documents is too vague and is applied in contradictory ways. I discuss the main goals of these documents and their claims in relation to human embryo research. I then discuss how they have influenced public policy in several countries. Finally, I show that although these Council of Europe treaties attempt to serve as public policy guides in the area of embryo research, they fail to do so. © 2009 Blackwell Publishing Ltd.

  3. Empathy and the application of the 'unbearable suffering' criterion in Dutch euthanasia practice.

    Science.gov (United States)

    van Tol, Donald G; Rietjens, Judith A C; van der Heide, Agnes

    2012-05-01

    A pivotal due care criterion for lawful euthanasia in the Netherlands is that doctors must be convinced that a patient requesting for euthanasia, suffers unbearably. Our study aims to find out how doctors judge if a patient suffers unbearably. How do doctors bridge the gap from 3rd person assessment to 1st person experience? We performed a qualitative interview study among 15 physicians, mainly general practitioners, who participated earlier in a related quantitative survey on the way doctors apply the suffering criterion. Results show that doctors follow different 'cognitive routes' when assessing a patients suffering in the context of a euthanasia request. Sometimes doctors do this imagining how she herself would experience the situation of the patient ('imagine self'). Doctors may also try to adopt the perspective of the patient and imagine what the situation is like for this particular patient ('imagine other'). Besides this we found that the (outcome of the) assessment is influenced by a doctor's private norms, values and emotions considering (the performance of) euthanasia. We conclude by arguing why doctors should be aware of both the 'cognitive route' followed as well as the influence of their own personal norms on the assessment of suffering in the context of euthanasia requests. Copyright © 2012 Elsevier Ireland Ltd. All rights reserved.

  4. A Soft Parameter Function Penalized Normalized Maximum Correntropy Criterion Algorithm for Sparse System Identification

    Directory of Open Access Journals (Sweden)

    Yingsong Li

    2017-01-01

    Full Text Available A soft parameter function penalized normalized maximum correntropy criterion (SPF-NMCC algorithm is proposed for sparse system identification. The proposed SPF-NMCC algorithm is derived on the basis of the normalized adaptive filter theory, the maximum correntropy criterion (MCC algorithm and zero-attracting techniques. A soft parameter function is incorporated into the cost function of the traditional normalized MCC (NMCC algorithm to exploit the sparsity properties of the sparse signals. The proposed SPF-NMCC algorithm is mathematically derived in detail. As a result, the proposed SPF-NMCC algorithm can provide an efficient zero attractor term to effectively attract the zero taps and near-zero coefficients to zero, and, hence, it can speed up the convergence. Furthermore, the estimation behaviors are obtained by estimating a sparse system and a sparse acoustic echo channel. Computer simulation results indicate that the proposed SPF-NMCC algorithm can achieve a better performance in comparison with the MCC, NMCC, LMS (least mean square algorithms and their zero attraction forms in terms of both convergence speed and steady-state performance.

  5. Design optimization of scaffold microstructures using wall shear stress criterion towards regulated flow-induced erosion.

    Science.gov (United States)

    Chen, Yuhang; Schellekens, Michiel; Zhou, Shiwei; Cadman, Joseph; Li, Wei; Appleyard, Richard; Li, Qing

    2011-08-01

    Tissue scaffolds aim to provide a cell-friendly biomechanical environment for facilitating cell growth. Existing studies have shown significant demands for generating a certain level of wall shear stress (WSS) on scaffold microstructural surfaces for promoting cellular response and attachment efficacy. Recently, its role in shear-induced erosion of polymer scaffold has also drawn increasing attention. This paper proposes a bi-directional evolutionary structural optimization (BESO) approach for design of scaffold microstructure in terms of the WSS uniformity criterion, by downgrading highly-stressed solid elements into fluidic elements and/or upgrading lowly-stressed fluidic elements into solid elements. In addition to this, a computational model is presented to simulate shear-induced erosion process. The effective stiffness and permeability of initial and optimized scaffold microstructures are characterized by the finite element based homogenization technique to quantify the variations of mechanical properties of scaffold during erosion. The illustrative examples show that a uniform WSS is achieved within the optimized scaffold microstructures, and their architectural and biomechanical features are maintained for a longer lifetime during shear-induced erosion process. This study provides a mathematical means to the design optimization of cellular biomaterials in terms of the WSS criterion towards controllable shear-induced erosion.

  6. A channel-selection criterion for suppressing reverberation in cochlear implants.

    Science.gov (United States)

    Kokkinakis, Kostas; Hazrati, Oldooz; Loizou, Philipos C

    2011-05-01

    Little is known about the extent to which reverberation affects speech intelligibility by cochlear implant (CI) listeners. Experiment 1 assessed CI users' performance using Institute of Electrical and Electronics Engineers (IEEE) sentences corrupted with varying degrees of reverberation. Reverberation times of 0.30, 0.60, 0.80, and 1.0 s were used. Results indicated that for all subjects tested, speech intelligibility decreased exponentially with an increase in reverberation time. A decaying-exponential model provided an excellent fit to the data. Experiment 2 evaluated (offline) a speech coding strategy for reverberation suppression using a channel-selection criterion based on the signal-to-reverberant ratio (SRR) of individual frequency channels. The SRR reflects implicitly the ratio of the energies of the signal originating from the early (and direct) reflections and the signal originating from the late reflections. Channels with SRR larger than a preset threshold were selected, while channels with SRR smaller than the threshold were zeroed out. Results in a highly reverberant scenario indicated that the proposed strategy led to substantial gains (over 60 percentage points) in speech intelligibility over the subjects' daily strategy. Further analysis indicated that the proposed channel-selection criterion reduces the temporal envelope smearing effects introduced by reverberation and also diminishes the self-masking effects responsible for flattened formants.

  7. Efficient linear criterion for witnessing Einstein-Podolsky-Rosen nonlocality under many-setting local measurements

    Science.gov (United States)

    Zheng, Yu-Lin; Zhen, Yi-Zheng; Chen, Zeng-Bing; Liu, Nai-Le; Chen, Kai; Pan, Jian-Wei

    2017-01-01

    The striking and distinctive nonlocal features of quantum mechanics were discovered by Einstein, Podolsky, and Rosen (EPR) beyond classical physics. At the core of the EPR argument, it was "steering" that Schrödinger proposed in 1935. Besides its fundamental significance, quantum steering opens up a novel application for quantum communication. Recent work has precisely characterized its properties; however, witnessing the EPR nonlocality remains a big challenge under arbitrary local measurements. Here we present an alternative linear criterion and complement existing results to efficiently testify steering for high-dimensional system in practice. By developing a novel and analytical method to tackle the maximization problem in deriving the bound of a steering criterion, we show how observed correlations can reveal powerfully the EPR nonlocality in an easily accessed manner. Although the criteria is not necessary and sufficient, it can recover some of the known results under a few settings of local measurements and is applicable even if the size of the system or the number of measurement settings are high. Remarkably, a deep connection is explicitly established between the steering and amount of entanglement. The results promise viable paths for secure communication with an untrusted source, providing optional loophole-free tests of the EPR nonlocality for high-dimensional states, as well as motivating solutions for other related problems in quantum information theory.

  8. A weighted information criterion for multiple minor components and its adaptive extraction algorithms.

    Science.gov (United States)

    Gao, Yingbin; Kong, Xiangyu; Zhang, Huihui; Hou, Li'an

    2017-05-01

    Minor component (MC) plays an important role in signal processing and data analysis, so it is a valuable work to develop MC extraction algorithms. Based on the concepts of weighted subspace and optimum theory, a weighted information criterion is proposed for searching the optimum solution of a linear neural network. This information criterion exhibits a unique global minimum attained if and only if the state matrix is composed of the desired MCs of an autocorrelation matrix of an input signal. By using gradient ascent method and recursive least square (RLS) method, two algorithms are developed for multiple MCs extraction. The global convergences of the proposed algorithms are also analyzed by the Lyapunov method. The proposed algorithms can extract the multiple MCs in parallel and has advantage in dealing with high dimension matrices. Since the weighted matrix does not require an accurate value, it facilitates the system design of the proposed algorithms for practical applications. The speed and computation advantages of the proposed algorithms are verified through simulations. Copyright © 2017 Elsevier Ltd. All rights reserved.

  9. The exact form of the Bohm criterion for a collisional plasma

    CERN Document Server

    Tsankov, Tsanko Vaskov

    2016-01-01

    A long-standing debate in the literature about the kinetic form of the Bohm criterion is resolved for plasmas with single positive ion species when transport is dominated by charge exchange collisions. The solution of the Boltzmann equation for the ions gives the exact form free of any divergence and contains an additional term that is not included in the classical result. This term includes collisional and geometric effects and leads to a noticeable correction. Further, the question is addressed whether the space charge argument at the bottom of the Bohm criterion can actually lead to a meaningful definition of the transition point between bulk and sheath. The analysis is supported by a numerical model and experiments, showing excellent agreement throughout. As a novelty in diagnostics, the theoretical results allow from the ion velocity distribution function (IVDF), measured at the wall, a reconstruction of the IVDF and the electric field at any point in the plasma. This property is used to reconstruct non-...

  10. Fragment Production and Survival in Irradiated Disks: A Comprehensive Cooling Criterion

    Science.gov (United States)

    Kratter, Kaitlin M.; Murray-Clay, Ruth A.

    2011-10-01

    Accretion disks that become gravitationally unstable can fragment into stellar or substellar companions. The formation and survival of these fragments depends on the precarious balance between self-gravity, internal pressure, tidal shearing, and rotation. Disk fragmentation depends on two key factors: (1) whether the disk can get to the fragmentation boundary of Q = 1 and (2) whether fragments can survive for many orbital periods. Previous work suggests that to reach Q = 1, and have fragments survive, a disk must cool on an orbital timescale. Here we show that disks heated primarily by external irradiation always satisfy the standard cooling time criterion. Thus, even though irradiation heats disks and makes them more stable in general, once they reach the fragmentation boundary, they fragment more easily. We derive a new cooling criterion that determines fragment survival and calculate a pressure-modified Hill radius, which sets the maximum size of pressure-supported objects in a Keplerian disk. We conclude that fragmentation in protostellar disks might occur at slightly smaller radii than previously thought and recommend tests for future simulations that will better predict the outcome of fragmentation in real disks.

  11. [Criterion and Construct Validity in Nursing Diagnosis "Sedentary Lifestyle" in People over 50 Years Old].

    Science.gov (United States)

    Guirao-Goris, Silamani J; Ferrer Ferrandis, Esperanza; Montejano Lozoya, Raimunda

    2016-02-18

    The aim of the study is to identify the construct and criterion validity of the nursing diagnosis label Sedentary Lifestyle. A cross-sectional study in a nursing consultation in primary health care was conducted. Participants were all people that was attended for one year over 50 who voluntarily wish to participate (n=85) in the study. Objective weekly physical activity was measured in METs with an Accelerometer, objective measure of performance was measured by gait speed EPESE Battery (both measures that were used as the gold standard), and physical activity questionnaires (RAPA), the COOP-WONCA physical fitness chart. Spearman correlation coefficients, mean comparison tests and analysis of sensitivity and specificity were used as statistical analysis. The diagnosis "Sedentary Lifestyle" showed a positive correlation between its manifestations and physical activity measured in METs (r=0.39) and EPESE gait speed (r=0.35). The diagnosis showed a sensitivity of 85.1% and a specificity of 65.2% and showed ability to discriminate active people from those that are not using METs as a measure of physical activity (t=-4.4). The diagnosis "Sedentary Lifestyle" shows criterion and construct validity.

  12. Self-powered suspension criterion and energy regeneration implementation scheme of motor-driven active suspension

    Science.gov (United States)

    Yan, Shuai; Sun, Weichao

    2017-09-01

    Active suspension systems have advantages on mitigating the effects of vehicle vibration caused by road roughness, which are one of the most important component parts in influencing the performances of vehicles. However, high amount of energy consumption restricts the application of active suspension systems. From the point of energy saving, this paper presents a self-powered criterion of the active suspension system to judge whether a motor-driven suspension can be self-powered or not, and then a motor parameter condition is developed as a reference to design a self-powered suspension. An energy regeneration implementation scheme is subsequently proposed to make the active suspension which has the potential to be self-powered achieve energy-saving target in the real application. In this implementation scheme, operating electric circuits are designed based on different working status of the actuator and power source and it is realizable to accumulate energy from road vibration and supply energy to the actuator by switching corresponding electric circuits. To apply the self-powered suspension criterion and energy regeneration implementation scheme, an active suspension system is designed with a constrained H∞ controller and calculation results indicate that it has the capability to be self-powered. Simulation results show that the performances of the self-powered active suspension are nearly the same as those of the active suspension with an external energy source and can achieve energy regeneration at the same time.

  13. Unidentified bright objects on brain MRI in children as a diagnostic criterion for neurofibromatosis type 1

    Energy Technology Data Exchange (ETDEWEB)

    Lopes Ferraz Filho, Jose R.; Pontes Munis, Marcos; Soares Souza, Antonio; Sanches, Rafael A. [Medical School in Sao Jose do Rio Preto, Imaging Department, Sao Jose do Rio Preto, Sao Paulo (Brazil); Goloni-Bertollo, Eni M.; Pavarino-Bertelli, Erika C. [Center of Research and Attendance in Neurofibromatosis, Sao Paulo (Brazil)

    2008-03-15

    Lesions of the brain denominated as unidentified bright objects (UBOs), which are not included in the diagnostic criteria for neurofibromatosis type 1 (NF1) established by the National Institutes of Health (NIH), have been detected by MRI. The purpose of this study was to investigate the possibility of including the presence of UBOs as a diagnostic criterion for NF1 in children. The study included 88 children between the ages of 2 and 18 years. The case group consisted of 40 children diagnosed with sporadic or familial NF1 according to the criteria established by the NIH. A control group consisted of 48 individuals referred for routine MRI of the brain for other complaints not related to NF1. UBOs were identified in 70% of the NF1 patients and in none of the control group. The sensitivity of the presence of UBOs for the diagnosis of NF1 was 70% (CI 53-83%), with a false-negative rate of 30% (CI 27-47%), a specificity of 100% (CI 86-100%) and a false-positive rate of 0% (CI 0-14%). Faced with the difficulties in diagnosing NF1 in children and the high frequency and specificity of the presence UBOs identified by MRI in our series, we recommend the inclusion of the presence UBOs as a diagnostic criterion for NF1 in children. (orig.)

  14. A new criterion to assess distributional homogeneity in hyperspectral images of solid pharmaceutical dosage forms

    Energy Technology Data Exchange (ETDEWEB)

    Sacré, Pierre-Yves, E-mail: pysacre@ulg.ac.be [University of Liege (ULg), Department of Pharmacy, CIRM, Laboratory of Analytical Chemistry, CHU, B36, 4000 Liege (Belgium); Lebrun, Pierre [Arlenda S.A., Avenue de l’Hopital, 1, B-4000 Liege (Belgium); Chavez, Pierre-François; Bleye, Charlotte De; Netchacovitch, Lauranne; Rozet, Eric [University of Liege (ULg), Department of Pharmacy, CIRM, Laboratory of Analytical Chemistry, CHU, B36, 4000 Liege (Belgium); Klinkenberg, Régis; Streel, Bruno [Galéphar Research Center M/F, rue du Parc Industriel 39, 6900 Marche-en-Famenne (Belgium); Hubert, Philippe; Ziemons, Eric [University of Liege (ULg), Department of Pharmacy, CIRM, Laboratory of Analytical Chemistry, CHU, B36, 4000 Liege (Belgium)

    2014-03-01

    Highlights: • DHI has been developed to assess distributional homogeneity in hyperspectral maps. • This criterion has been tested with simulated maps of different homogeneity. • A linear relationship is observed between homogeneity and DHI value. • DHI methodology has been applied on real samples. • A linear relationship is observed between DHI and content uniformity values. - Abstract: During galenic formulation development, homogeneity of distribution is a critical parameter to check since it may influence activity and safety of the drug. Raman hyperspectral imaging is a technique of choice for assessing the distributional homogeneity of compounds of interest. Indeed, the combination of both spectroscopic and spatial information provides a detailed knowledge of chemical composition and component distribution. Actually, most authors assess homogeneity using parameters of the histogram of intensities (e.g. mean, skewness and kurtosis). However, this approach does not take into account spatial information and loses the main advantage of imaging. To overcome this limitation, we propose a new criterion: Distributional Homogeneity Index (DHI). DHI has been tested on simulated maps and formulation development samples. The distribution maps of the samples were obtained without validated calibration model since different formulations were under investigation. The results obtained showed a linear relationship between content uniformity values and DHI values of distribution maps. Therefore, DHI methodology appears to be a suitable tool for the analysis of homogeneity of distribution maps even without calibration during formulation development.

  15. Biomechanical simulation of needle insertion into cornea based on distortion energy failure criterion.

    Science.gov (United States)

    Su, Peng; Yang, Yang; Zhang, Leiyu; Huang, Long

    2016-01-01

    This paper is mainly about biomechanical behavior of needle insertion into cornea, and proposes a failure criterion to simulate the insertion process which has attracted considerable attention due to its importance for the minimally invasive treatment. In the process of needle insertion into cornea, tiny and complex insertion force is generated due to contact between needle and soft tissue. Based on the distortion energy theory, there is proposed a failure criterion of corneal material that can solve contact problem between rigid body and biological tissue in insertion simulation, where Cauchy stress of corneal material is the key to numerical calculation. A finite element model of in vivo cornea is built, and the cornea constrained by sclera is simplified to two layers containing epithelium and stroma. Considering the hyper-viscoelastic property of corneal material, insertion simulation is carried out. By insertion experiment, the insertion force increases with insertion depth accompanying obvious fluctuations. Different insertion forces are generated at different speeds. The punctured locations are obvious in the force-displacement curves. The results of insertion simulation are generally consistent with experimental data. Maps of von Mises stress reflect the tissue injury of the cornea during insertion process, and punctured status corresponds to the point in the curves. The ability of this study to reproduce the behavior of needle insertion into cornea opens a promising perspective for the control of robotic surgery operation as well as the real-time simulation of corneal suture surgery.

  16. Automated criterion-based analysis for Cole parameters assessment from cerebral neonatal electrical bioimpedance spectroscopy measurements.

    Science.gov (United States)

    Seoane, F; Ward, L C; Lindecrantz, Kaj; Lingwood, B E

    2012-08-01

    Hypothermia has been proven as an effective rescue therapy for infants with moderate or severe neonatal hypoxic ischemic encephalopathy. Hypoxia-ischemia alters the electrical impedance characteristics of the brain in neonates; therefore, spectroscopic analysis of the cerebral bioimpedance of the neonate may be useful for the detection of candidate neonates eligible for hypothermia treatment. Currently, in addition to the lack of reference bioimpedance data obtained from healthy neonates, there is no standardized approach established for bioimpedance spectroscopy data analysis. In this work, cerebral bioimpedance measurements (12 h postpartum) in a cross-section of 84 term and near-term healthy neonates were performed at the bedside in the post-natal ward. To characterize the impedance spectra, Cole parameters (R(0), R(∞), f(C) and α) were extracted from the obtained measurements using an analysis process based on a best measurement and highest likelihood selection process. The results obtained in this study complement previously reported work and provide a standardized criterion-based method for data analysis. The availability of electrical bioimpedance spectroscopy reference data and the automatic criterion-based analysis method might support the development of a non-invasive method for prompt selection of neonates eligible for cerebral hypothermic rescue therapy.

  17. Ignition criterion for heterogeneous energetic materials based on hotspot size-temperature threshold

    Science.gov (United States)

    Barua, A.; Kim, S.; Horie, Y.; Zhou, M.

    2013-02-01

    A criterion for the ignition of granular explosives (GXs) and polymer-bonded explosives (PBXs) under shock and non-shock loading is developed. The formulation is based on integration of a quantification of the distributions of the sizes and locations of hotspots in loading events using a cohesive finite element method (CFEM) developed recently and the characterization by Tarver et al. [C. M. Tarver et al., "Critical conditions for impact- and shock-induced hot spots in solid explosives," J. Phys. Chem. 100, 5794-5799 (1996)] of the critical size-temperature threshold of hotspots required for chemical ignition of solid explosives. The criterion, along with the CFEM capability to quantify the thermal-mechanical behavior of GXs and PBXs, allows the critical impact velocity for ignition, time to ignition, and critical input energy at ignition to be determined as functions of material composition, microstructure, and loading conditions. The applicability of the relation between the critical input energy (E) and impact velocity of James [H. R. James, "An extension to the critical energy criterion used to predict shock initiation thresholds," Propellants, Explos., Pyrotech. 21, 8-13 (1996)] for shock loading is examined, leading to a modified interpretation, which is sensitive to microstructure and loading condition. As an application, numerical studies are undertaken to evaluate the ignition threshold of granular high melting point eXplosive, octahydro-1,3,5,7-tetranitro-1,2,3,5-tetrazocine (HMX) and HMX/Estane PBX under loading with impact velocities up to 350 ms-1 and strain rates up to 105 s-1. Results show that, for the GX, the time to criticality (tc) is strongly influenced by initial porosity, but is insensitive to grain size. Analyses also lead to a quantification of the differences between the responses of the GXs and PBXs in terms of critical impact velocity for ignition, time to ignition, and critical input energy at ignition. Since the framework permits

  18. Geoscience Education and Public Outreach AND CRITERION 2: MAKING A BROADER IMPACT

    Science.gov (United States)

    Marlino, M.; Scotchmoor, J. G.

    2005-12-01

    The geosciences influence our daily lives and yet often go unnoticed by the general public. From the moment we listen to the weather report and fill-up our cars for the daily commute, until we return to our homes constructed from natural resources, we rely on years of scientific research. The challenge facing the geosciences is to make explicit to the public not only the criticality of the research whose benefits they enjoy, but also to actively engage them as partners in the research effort, by providing them with sufficient understanding of the scientific enterprise so that they become thoughtful and proactive when making decisions in the polling booth. Today, there is broad recognition within the science and policy community that communication needs to be more effective, more visible, and that the public communication of the scientific enterprise is critical not only to its taxpayer support, but also to maintenance of a skilled workforce and the standard of living expected by many Americans. In 1997, the National Science Board took the first critical step in creating a cultural change in the scientific community by requiring explicit consideration of the broader impacts of research in every research proposal. The so-called Criterion 2 has catalyzed a dramatic shift in expectations within the geoscience community and an incentive for finding ways to encourage the science research community to select education and public outreach as a venue for responding to Criterion 2. In response, a workshop organized by the University of California Museum of Paleontology and the Digital Library for Earth System Education (DLESE) was held on the Berkeley campus May 11-13, 2005. The Geoscience EPO Workshop purposefully narrowed its focus to that of education and public outreach. This workshop was based on the premise that there are proven models and best practices for effective outreach strategies that need to be identified and shared with research scientists. Workshop

  19. Os tipos psicológicos na psicologia analítica de Carl Gustav Jung e o inventário de personalidade "Myers-Briggs Type Indicator (MBTI)" : contribuições para a psicologia educacional, organizacional e clínica

    OpenAIRE

    Ramos, Luís Marcelo Alves

    2005-01-01

    O texto apresenta os princípios da Teoria dos Tipos Psicológicos, a mais conhecida face da Psicologia Analítica do psicólogo e psiquiatra suíço Carl Gustav Jung (1875-1961), bem como os fundamentos do Inventário de Personalidade "Myers-Briggs Type Indicator (MBTI)", constituído a partir da tipologia junguiana, e que vem sendo cada vez mais utilizado nos campos da Psicologia Educacional, Organizacional e Clínica. The text presents the principles of the Theory of Psychological Types, the mos...

  20. Os Tipos Psicológicos Na Psicologia Analítica De Carl Gustav Jung E O Inventário De Personalidade “myers-briggs Type Indicator (mbti)”: Contribuições Para A Psicologia Educacional, Organizacional E Clínicathe Psychological Types In Analytical Psychology O

    OpenAIRE

    Luís Marcelo Alves Ramos

    2008-01-01

    O texto apresenta os princípios da Teoria dos Tipos Psicológicos, a mais conhecida face da Psicologia Analítica do psicólogo e psiquiatra suíço Carl Gustav Jung (1875-1961), bem como os fundamentos do Inventário de Personalidade “Myers-Briggs Type Indicator (MBTI)”, constituído a partir da tipologia junguiana, e que vem sendo cada vez mais utilizado nos campos da Psicologia Educacional, Organizacional e Clínica. Palavras-chave Psicologia analítica; Teorias da personalidade; Tipos psicol...

  1. PID controller auto-tuning based on process step response and damping optimum criterion.

    Science.gov (United States)

    Pavković, Danijel; Polak, Siniša; Zorc, Davor

    2014-01-01

    This paper presents a novel method of PID controller tuning suitable for higher-order aperiodic processes and aimed at step response-based auto-tuning applications. The PID controller tuning is based on the identification of so-called n-th order lag (PTn) process model and application of damping optimum criterion, thus facilitating straightforward algebraic rules for the adjustment of both the closed-loop response speed and damping. The PTn model identification is based on the process step response, wherein the PTn model parameters are evaluated in a novel manner from the process step response equivalent dead-time and lag time constant. The effectiveness of the proposed PTn model parameter estimation procedure and the related damping optimum-based PID controller auto-tuning have been verified by means of extensive computer simulations. © 2013 ISA. Published by Elsevier Ltd. All rights reserved.

  2. Comparing Test Scores Using Information From Criterion-Related Validity Studies.

    Science.gov (United States)

    Beaujean, A Alexander; McGlaughlin, Sean M

    2016-01-01

    There is frequently a need to compare a client's test scores from different instruments. If the scores come from instruments that use the same scale, it is tempting to compare the scores directly. Unfortunately, this method can lead clinicians to believe that there is a large difference between scores when the difference is minimal. As an alternative, we outline a method for score comparison that uses information from criterion-related validity studies. Using three examples, we show why this method is more psychometrically sound, produces more accurate comparison scores, and requires little extra work for clinicians than the direct comparison approach. To make the score comparison process easy for clinicians to use, we include an appendix that demonstrates how to implement this method in Microsoft Excel and the free R program.

  3. Augmented lagrange based on modified covariance matching criterion method for DOA estimation in compressed sensing.

    Science.gov (United States)

    Si, Weijian; Qu, Xinggen; Liu, Lutao

    2014-01-01

    A novel direction of arrival (DOA) estimation method in compressed sensing (CS) is presented, in which DOA estimation is considered as the joint sparse recovery from multiple measurement vectors (MMV). The proposed method is obtained by minimizing the modified-based covariance matching criterion, which is acquired by adding penalties according to the regularization method. This minimization problem is shown to be a semidefinite program (SDP) and transformed into a constrained quadratic programming problem for reducing computational complexity which can be solved by the augmented Lagrange method. The proposed method can significantly improve the performance especially in the scenarios with low signal to noise ratio (SNR), small number of snapshots, and closely spaced correlated sources. In addition, the Cramér-Rao bound (CRB) of the proposed method is developed and the performance guarantee is given according to a version of the restricted isometry property (RIP). The effectiveness and satisfactory performance of the proposed method are illustrated by simulation results.

  4. On signal design by the R/0/ criterion for non-white Gaussian noise channels

    Science.gov (United States)

    Bordelon, D. L.

    1977-01-01

    The use of the cut-off rate criterion for modulation system design is investigated for channels with non-white Gaussian noise. A signal space representation of the waveform channel is developed, and the cut-off rate for vector channels with additive non-white Gaussian noise and unquantized demodulation is derived. When the signal input to the channel is a continuous random vector, maximization of the cut-off rate with constrained average signal energy leads to a water-filling interpretation of optimal energy distribution in signal space. The necessary condition for a finite signal set to maximize the cut-off rate with constrained energy and an equally likely probability assignment of signal vectors is presented, and an algorithm is outlined for numerically computing the optimum signal set. As an example, the rectangular signal set which has the water-filling average energy distribution and the optimum rectangular set are compared.

  5. A criterion-referenced assessment is needed for measuring child obesity.

    Science.gov (United States)

    Brown, Elise C; Kilgore, J Lon; Buchan, Duncan S; Baker, Julien S

    2017-01-01

    Body Mass Index (BMI), as an adiposity indicator, assumes that for any given height a change in weight is attributed to a change in fat. This seems problematic in growing youth as great divergence is evident in bone, muscle, and adipose tissue development. Secondly, use of reference populations in categorizing children based on BMI, frequently use arbitrary percentile cut-offs for obesity and do not meet all of the assumptions that cut-offs imply. Lastly, BMI does not control for maturation status. Criterion-referenced assessments of child obesity that account for abdominal adiposity and permit international comparisons, such as waist-to-height ratio (WtHR), must be considered. Better predictive utility has been demonstrated when using WtHR for abdominal adiposity and cardiovascular risk factors in youth compared with BMI. Although multiple methods for assessing waist circumference may be problematic for comparison purposes, its simplicity and international comparability aspects make it a promising alternative to BMI.

  6. A uniqueness criterion for the Fock quantization of scalar fields with time-dependent mass

    Science.gov (United States)

    Cortez, Jerónimo; Mena Marugán, Guillermo A.; Olmedo, Javier; Velhinho, José M.

    2011-09-01

    A major problem in the quantization of fields in curved spacetimes is the ambiguity in the choice of a Fock representation for the canonical commutation relations. There exists infinite number of choices leading to different physical predictions. In stationary scenarios, a common strategy is to select a vacuum (or a family of unitarily equivalent vacua) by requiring invariance under the spacetime symmetries. When stationarity is lost, a natural generalization consists in replacing time invariance by unitarity in the evolution. We prove that when the spatial sections are compact, the criterion of a unitary dynamics, together with the invariance under the spatial isometries, suffices to select a unique family of Fock quantizations for a scalar field with time-dependent mass.

  7. Optimization of the Structures at Shakedown and Rosen’s Optimality Criterion

    Directory of Open Access Journals (Sweden)

    Alawdin Piotr

    2016-09-01

    Full Text Available Paper focuses on the problems of application of extreme energy principles and nonlinear mathematical programing in the theory of structural shakedown. By means of energy principles, which describes the true stress-strain state conditions of the structure, the dual mathematical models of analysis problems are formed (static and kinematic formulations. It is shown how common mathematical model of the structures optimization at shakedown with safety and serviceability constraints (according to the ultimate limit state (ULS and serviceability limit state (SLS requirements on the basis of previously mentioned mathematical models is formed. The possibilities of optimization problem solution in the context of physical interpretation of optimality criterion of Rosen’s algorithm are analyzed.

  8. Stochastic Games for Continuous-Time Jump Processes Under Finite-Horizon Payoff Criterion

    Energy Technology Data Exchange (ETDEWEB)

    Wei, Qingda, E-mail: weiqd@hqu.edu.cn [Huaqiao University, School of Economics and Finance (China); Chen, Xian, E-mail: chenxian@amss.ac.cn [Peking University, School of Mathematical Sciences (China)

    2016-10-15

    In this paper we study two-person nonzero-sum games for continuous-time jump processes with the randomized history-dependent strategies under the finite-horizon payoff criterion. The state space is countable, and the transition rates and payoff functions are allowed to be unbounded from above and from below. Under the suitable conditions, we introduce a new topology for the set of all randomized Markov multi-strategies and establish its compactness and metrizability. Then by constructing the approximating sequences of the transition rates and payoff functions, we show that the optimal value function for each player is a unique solution to the corresponding optimality equation and obtain the existence of a randomized Markov Nash equilibrium. Furthermore, we illustrate the applications of our main results with a controlled birth and death system.

  9. A criterion for the reliable use of MRI-only radiotherapy

    DEFF Research Database (Denmark)

    Elgaard Korsholm Nielsen, Marie; Waring, Line Winther; Edmund, Jens

    2014-01-01

    BACKGROUND: MRI-only radiotherapy will eliminate the systematic registration errors introduced when transferring MRI information to the CT. However, challenges concerning the missing information on electron density, necessary for dose calculation and patient setup on bony anatomy are introduced....... This study presents a possible statistical approach to evaluate, if deviations based on MRI-only radiotherapy as compared to the CT based radiotherapy are acceptable. METHODS: 18 head-and-neck, 21 prostate, 10 vesica and 8 pelvic patients were included in the study. Data from each patient contained a CT......(median) and D2%, while only head-and-neck and prostate further fulfilled the criterion in D98%. CONCLUSION: Here, we suggested a method for establishing a reliable use of MRI-only radiotherapy. A population-based study comparing CT based dose calculations with those obtained on a suggested segmentation of MRI...

  10. Empirical as Criterion of law Effectiveness: between Alf Ros and Hebert Hart

    Directory of Open Access Journals (Sweden)

    Horácio Wanderlei Rodrigues

    2016-04-01

    Full Text Available Legal positivism positions the law in the formal validity. However, the law theory also focuses on other aspects of empirical to understand the legal phenomenon, we seek such elements in the works of Herbert Hart and Alf Ross. To Hart the rule of recognition’s content, that we can use to meet the validity of the right, should be measured empirically in each legal system and may also (but not necessarily incorporate moral elements. Differently, the realistic Ross theory is independent of the validity criterion and he argues that the effectiveness is verifiable by the effective application of the law by legal authorities.

  11. College students' readiness to reduce binge drinking: criterion validity of a brief measure.

    Science.gov (United States)

    McGee, Rob; Williams, Sheila; Kypri, Kypros

    2010-06-01

    We assessed the criterion-related validity of a contemplation ladder used to determine college students' readiness to reduce binge drinking. 1356 students in halls of residence in Dunedin, New Zealand completed a self-report survey including the contemplation ladder, AUDIT questionnaire, and other alcohol-related measures. Two groups of binge drinkers were identified, one reporting bingeing more than twice per week (n=645), and one bingeing 1-2 times per week (n=237). A third group did not report binge drinking (n=474). A higher readiness to change binge drinking was associated with more frequent bingeing, more interpersonal and academic problems with alcohol, less frequent use of cannabis, and living in a hall with a norm of binge drinking. The contemplation ladder for alcohol was sensitive to other alcohol-related behaviours, and may be useful in surveys of drinking where a brief measure of readiness to change is needed. Copyright (c) 2010 Elsevier Ireland Ltd. All rights reserved.

  12. Revision, Criterion Validity, and Multi-group Assessment of the Reactions to Homosexuality Scale

    Science.gov (United States)

    Smolenski, Derek J.; Diamond, Pamela M.; Ross, Michael W.; Simon Rosser, B. R.

    2010-01-01

    Internalized homonegativity encompasses negative attitudes toward one’s own sexual orientation, and is associated with negative mental and physical health outcomes. The Reactions to Homosexuality scale (Ross & Rosser, 1996), an instrument used to measure internalized homonegativity, has been criticized for including content irrelevant to the construct of internalized homonegativity. We revised the scale using exploratory and confirmatory factor analyses, and identified a seven-item, three-factor reduced version that demonstrated measurement invariance across racial/ethnic categorizations and between English and Spanish versions. We also investigated criterion validity by estimating correlations with hypothesized outcomes associated with outness, relationship status, sexual orientation, and gay community affiliation. The evidence of measurement invariance suggests that this scale is appropriate for pluralistic treatment or study groups. PMID:20954058

  13. Communication and general concern criterion prior to activation of the rapid response team: a grounded theory.

    Science.gov (United States)

    Martland, Jarrad; Chamberlain, Diane; Hutton, Alison; Smigielski, Michael

    2016-11-01

    Objective Patients commonly show signs and symptoms of deterioration for hours or days before cardiorespiratory arrest. Rapid response teams (RRT) were created to improve recognition and response to patient deterioration in these situations. Activation criteria include vital signs or 'general concern' by a clinician or family member. The general concern criterion for RRT activation accounts for nearly one-third of all RRT activity, and although it is well established that communication deficits between staff can contribute to poorer outcomes for patients, there is little evidence pertaining to communication and its effects on the general concern RRT activation. Thus, the aim of the present study was to develop a substantive grounded theory related to the communication process between clinicians that preceded the activation of an RRT when general concern criterion was used. Methods Qualitative grounded theory involved collection of three types of data details namely personal notes from participants in focus groups with white board notes from discussions and audio recordings of the focus groups sessions. Focus groups were conducted with participants exploring issues associated with clinician communication and how it related to the activation of an RRT using the general concern criterion. Results The three main phases of coding (i.e. open, axial and selective coding) analysis identified 322 separate open codes. The strongest theme contributed to a theory of ineffective communication and decreased psychological safety, namely that 'In the absence of effective communication there is a subsequent increase in anxiety, fear or concern that can be directly attributed to the activation of an RRT using the 'general concern' criterion'. The RRT filled cultural and process deficiencies in the compliance with an escalation protocol. Issues such as 'not for resuscitation documentation' and 'inability to establish communication with and between medical or nursing personnel' rated

  14. Taurodontism: A minor diagnostic criterion in Laurence-Moon/Bardet-Biedl syndromes.

    Science.gov (United States)

    Andersson, Els-Marie; Axelsson, Stefan; Gjølstad, Lars-Fredrik; Storhaug, Kari

    2013-11-01

    The objective of the study was to present the prevalence of taurodontism in the permanent dentition in individuals with Laurence-Moon/Bardet-Biedl syndromes (LM/BBS). Thirty-nine individuals were studied, which comprises the whole population of known LM/BBS patients in Norway. Data were collected retrospectively. Panoramic radiographs (OPG) were evaluated to document taurodontism. Taurodontism was found in 82.9% of the individuals with LM/BBS. The second mandibular molars had the highest (72.3%) prevalence of taurodontism and the first mandibular molars the lowest (58.2%). This study suggests that taurodontism should be included as a minor diagnostic criterion for the Laurence-Moon/Bardet-Biedl syndromes (LM/BBS).

  15. "Visually clean" as a sole acceptance criterion for cleaning validation protocols.

    Science.gov (United States)

    LeBlanc, Destin A

    2002-01-01

    The role of visual examination as the sole acceptance criterion in cleaning validation protocols is explored, including the proper definition of "visual limit" for a given residue. Such a visual limit is specific to the surface the residue is on, and is further defined by viewing conditions, such as lighting, distance, and angle of viewing. A visually clean standard may only be properly utilized if the visual limit is below any scientifically calculated residue limit, such as that determined by a traditional dose-based limit determination. While such an approach, properly applied, has scientific justification and appears to be accepted by the proposed Annex 15 to the European GMPs, the approach is still untested with regulatory authorities.

  16. Bohm criterion and plasma particle/power exhaust to and recycling at the wall

    Directory of Open Access Journals (Sweden)

    Xian-Zhu Tang

    2017-08-01

    Full Text Available The plasma particle and power exhaust to the divertor surface drives both particle and power recycling at the surface, which in return constrains the plasma density and temperature at the target and their profile further upstream. Both particle and power exhaust fluxes are mediated by the plasma sheath next to the divertor surface. In particular, the Bohm criterion constrains the ion exit flow speed, which enters directly into the particle flux and the kinetic flow energy component of the ion power flux, and indirectly into the electron power flux through the sheath potential drop. Here we give an overview on how the Bohm speed is set in a general plasma and how it enters power exhaust and power recycling at the divertor surface, and the implication on the correct implementation of sheath boundary conditions in numerical codes. The cases of ideal and non-ideal Bohm speed are distinguished as a result of the physics discussion.

  17. Fracture prediction of hole expansion forming using forming limit stress criterion

    Science.gov (United States)

    Hakoyama, Tomoyuki; Nakano, Hayato; Kuwabara, Toshihiko

    2017-10-01

    The fracture prediction of a hole expansion forming for a cold rolled steel sheet is investigated using the concept of forming limit stress criterion. Multiaxial tube expansion tests (MTET) (T. Kuwabara and F. Sugawara, 2014), in which linear paths in the first quadrant of the stress space are applied to tubular specimens, are performed to measure the contours of plastic work and the directions of the plastic strain rates of the test material. The anisotropic parameters and the exponent of the Yld2000-2d yield function (F. Barlat et al., 2003) are optimized to approximate the material test data. Marciniak-Kuczynski type forming limit analyses (Z. Marciniak and K. Kuczynski, 1967) are performed to determine the forming limit stress surface (FLSS) in a stress space. It is concluded that the FLSS calculated using an appropriate material model calibrated using the MTET is effective in predicting the necking timing in the hole expansion forming of the test material.

  18. Speckle processing for OCT image based on Bayesian least mean square error criterion

    Directory of Open Access Journals (Sweden)

    WANG Rong

    2013-06-01

    Full Text Available This paper presents a noise reduction algorithm for the speckle noise in optical coherence tomography images based on Bayesian criterion.First,the noisy imaging data is put into the logarithmic space and sample is extracted from the data with noise of Gaussian distribution.Then pixels within the sample are given relevant weights based on the correlation between adjacent pixels in the image.Finally,the posterior distribution is estimated by using a weighted histogram approach and the noise-free data is estimated using generic Bayesian least mean square error estimate.Compared with traditional wavelet transformation noise reduction and median filtering denoising,this method obviously improves the signal-to-noise ratio (SNR and the equivalent apparent number (ENL of OCT image.Thus the image quality is enhanced to some extent.

  19. A Criterion for the Complete Deposition of Magnetic Beads on the Walls of Microchannels.

    Science.gov (United States)

    Pallares, Jordi

    2016-01-01

    This paper analyzes numerical simulations of the trajectories of magnetic beads in a microchannel, with a nearby permanent cubical magnet, under different flow and magnetic conditions. Analytically derived local fluid velocities and local magnetic forces have been used to track the particles. A centered position and a lateral position of the magnet above the microchannel are considered. The computed fractions of deposited particles on the walls are compared successfully with a new theoretically derived criterion that imposes a relation between the sizes of the magnet and the microchannel and the particle Stokes and Alfvén numbers to obtain the complete deposition of the flowing particles on the wall. In the cases in which all the particles, initially distributed uniformly across the section of the microchannel, are deposited on the walls, the simulations predict the accumulation of the major part of particles on the wall closest to the magnet and near the first half of the streamwise length of the magnet.

  20. Applying locally optimal criterion for classifying highly-reliable products with a control.

    Science.gov (United States)

    Chiao, C H; Tseng, S T

    1996-01-01

    At the research and development stage, decision-makers may wish to classify several competing designs with respect to a control (or standard) one. The classification problem may become very difficult when the products are highly reliable, since only a few (or even no) failures may be observed under normal use condition. The accelerated life test model resolves this difficulty by shortening the time of life testing and quickly provides life data of products. For highly-reliable products with a Weibull log-linear model, we propose a classification rule based on a locally optimal criterion. A suitable sampling plan based on this rule is also developed. The performance of this rule is compared with a pairwise comparison classification rule. It is shown that the sample sizes needed for the new rule are considerably lower than those needed for the pairwise comparison rule.

  1. Criterion-Related Validity of the 20-M Shuttle Run Test for Estimating Cardiorespiratory Fitness: A Meta-Analysis.

    Science.gov (United States)

    Mayorga-Vega, Daniel; Aguilar-Soto, Pablo; Viciana, Jesús

    2015-09-01

    The main purpose of the present meta-analysis was to examine the criterion-related validity of the 20-m shuttle run test for estimating cardiorespiratory fitness. Relevant studies were searched from twelve electronic databases up to December 2014, as well as from several alternative modes of searching. The Hunter-Schmidt's psychometric meta-analysis approach was conducted to estimate the population criterion-related validity of the 20-m shuttle run test. From 57 studies that were included in the present meta-analysis, a total of 78 correlation values were analyzed. The overall results showed that the performance score of the 20-m shuttle run test had a moderate-to-high criterion-related validity for estimating maximum oxygen uptake (r p = 0.66-0.84), being higher when other variables (e.g. sex, age or body mass) were used (r p = 0.78-0.95). The present meta-analysis also showed that the criterion-related validity of Léger's protocol was statistically higher for adults (r p = 0.94, 0.87-1.00) than for children (r p = 0.78, 0.72-0.85). However, sex and maximum oxygen uptake level do not seem to affect the criterion-related validity values. When an individual's maximum oxygen uptake attained during a laboratory-based test is not feasible, the 20-m shuttle run test seems to be a useful alternative for estimating cardiorespiratory fitness. In adults the performance score only seems to be a strong estimator of cardiorespiratory fitness, in contrast among children the performance score should be combined with other variables. Nevertheless, as in the application of any physical fitness field test, evaluators must be aware that the performance score of the 20-m shuttle run test is simply an estimation and not a direct measure of cardiorespiratory fitness. Key pointsOverall the 20-m shuttle run test has a moderate-to-high mean criterion-related validity for estimating cardiorespiratory fitness.The criterion-related validity of the 20-m shuttle run test is significantly

  2. Determining canonical views of 3D object using minimum description length criterion and compressive sensing method

    Science.gov (United States)

    Chen, Ping-Feng; Krim, Hamid

    2008-02-01

    In this paper, we propose using two methods to determine the canonical views of 3D objects: minimum description length (MDL) criterion and compressive sensing method. MDL criterion searches for the description length that achieves the balance between model accuracy and parsimony. It takes the form of the sum of a likelihood and a penalizing term, where the likelihood is in favor of model accuracy such that more views assists the description of an object, while the second term penalizes lengthy description to prevent overfitting of the model. In order to devise the likelihood term, we propose a model to represent a 3D object as the weighted sum of multiple range images, which is used in the second method to determine the canonical views as well. In compressive sensing method, an intelligent way of parsimoniously sampling an object is presented. We make direct inference from Donoho1 and Candes'2 work, and adapt it to our model. Each range image is viewed as a projection, or a sample, of a 3D model, and by using compressive sensing theory, we are able to reconstruct the object with an overwhelming probability by scarcely sensing the object in a random manner. Compressive sensing is different from traditional compressing method in the sense that the former compress things in the sampling stage while the later collects a large number of samples and then compressing mechanism is carried out thereafter. Compressive sensing scheme is particularly useful when the number of sensors are limited or the sampling machinery cost much resource or time.

  3. A systematic review of reliability and objective criterion-related validity of physical activity questionnaires.

    Science.gov (United States)

    Helmerhorst, Hendrik J F; Brage, Søren; Warren, Janet; Besson, Herve; Ekelund, Ulf

    2012-08-31

    Physical inactivity is one of the four leading risk factors for global mortality. Accurate measurement of physical activity (PA) and in particular by physical activity questionnaires (PAQs) remains a challenge. The aim of this paper is to provide an updated systematic review of the reliability and validity characteristics of existing and more recently developed PAQs and to quantitatively compare the performance between existing and newly developed PAQs.A literature search of electronic databases was performed for studies assessing reliability and validity data of PAQs using an objective criterion measurement of PA between January 1997 and December 2011. Articles meeting the inclusion criteria were screened and data were extracted to provide a systematic overview of measurement properties. Due to differences in reported outcomes and criterion methods a quantitative meta-analysis was not possible.In total, 31 studies testing 34 newly developed PAQs, and 65 studies examining 96 existing PAQs were included. Very few PAQs showed good results on both reliability and validity. Median reliability correlation coefficients were 0.62-0.71 for existing, and 0.74-0.76 for new PAQs. Median validity coefficients ranged from 0.30-0.39 for existing, and from 0.25-0.41 for new PAQs.Although the majority of PAQs appear to have acceptable reliability, the validity is moderate at best. Newly developed PAQs do not appear to perform substantially better than existing PAQs in terms of reliability and validity. Future PAQ studies should include measures of absolute validity and the error structure of the instrument.

  4. Construct and criterion validity of the Euro Qol-5D in patients with systemic lupus erythematosus.

    Directory of Open Access Journals (Sweden)

    Su-li Wang

    Full Text Available OBJECTIVE: To investigate the construct and criterion validity of the Euro Qol-5D (EQ-5D, which allows quality-adjusted life-years to be calculated, in patients with systemic lupus erythematosus (SLE. METHODS: Consecutive SLE patients who had been followed at the Renji Hospital, School of Medicine, Shanghai Jiao Tong University were recruited. Cross-sectional correlations of the EQ-5D with equivalent domains in disease-specific health-related quality of life (HRQoL, LupusQol, Systemic Lupus Erythematosus Disease Activity Index (SLEDAI measures, the Systemic Lupus International Collaborating Clinics Damage Index (SDI, and patient characteristics were tested. Discriminant validity to assess the ability to distinguish between patients of different disease severity was assessed. There also were evaluations of ceiling and floor effects. RESULTS: 240 patients were recruited in total. The EQ-5D correlated moderately to strongly with all domains of the LupusQoL (r: 0.44-0.7 apart from intimate relationships (r = 0.25 and body image (r = 0.18. There was moderate negative correlation between EQ-5D and clinical assessment of disease, SLEDAI (r = -0.589 and SDI (r = -0.509. When compared with equivalent domains on LupusQoL, there was good construct validity in EQ-5D (r: 0.631-0.812. EQ-5D could also discriminate patients with varied disease severity (according SLEDAI and SDI. There was no floor effect in EQ-5D but the ceiling effect remains strong (34%. CONCLUSION: Our results provide sufficient evidence that the EQ-5D displays construct and criterion validity for use in SLE patients. Disease-specific measures of HRQoL used alongside may be a better choice.

  5. Criterion-related validity of field-based fitness tests in youth: a systematic review.

    Science.gov (United States)

    Castro-Piñero, J; Artero, E G; España-Romero, V; Ortega, F B; Sjöström, M; Suni, J; Ruiz, J R

    2010-10-01

    The objective of this systematic review was to comprehensively study the criterion-related validity of the existing field-based fitness tests used in children and adolescents. The studies were scored according to the number of subjects, description of the study population and statistical analysis. Each study was classified as high, low and very low quality. Three levels of evidence were constructed: strong evidence, when consistent findings were observed in three or more high quality studies; moderate evidence, when consistent findings were observed in two high quality studies; and limited evidence when consistency of findings and/or the number of studies did not achieve the criteria for moderate. The results of 73 studies (50 of high quality) addressing the criterion-related validity of field-based fitness tests in children and adolescents indicate the following: that there is strong evidence indicating that the 20 m shuttle run test is a valid test to estimate cardiorespiratory fitness, that the hand-grip strength test is a valid measure of musculoskeletal fitness, that skin fold thickness and body mass index are good estimates of body composition, and that waist circumference is a valid measure to estimate central body fat. Moderate evidence was found that the 1-mile run/walk test is a valid test to estimate cardiorespiratory fitness. A large number of other field-based fitness tests presented limited evidence, mainly due to a limited number of studies (one for each test). The results of the present systematic review should be interpreted with caution due to the substantial lack of consistency in reporting and designing the existing validity studies.

  6. A systematic review of reliability and objective criterion-related validity of physical activity questionnaires

    Directory of Open Access Journals (Sweden)

    Helmerhorst Hendrik JF

    2012-08-01

    Full Text Available Abstract Physical inactivity is one of the four leading risk factors for global mortality. Accurate measurement of physical activity (PA and in particular by physical activity questionnaires (PAQs remains a challenge. The aim of this paper is to provide an updated systematic review of the reliability and validity characteristics of existing and more recently developed PAQs and to quantitatively compare the performance between existing and newly developed PAQs. A literature search of electronic databases was performed for studies assessing reliability and validity data of PAQs using an objective criterion measurement of PA between January 1997 and December 2011. Articles meeting the inclusion criteria were screened and data were extracted to provide a systematic overview of measurement properties. Due to differences in reported outcomes and criterion methods a quantitative meta-analysis was not possible. In total, 31 studies testing 34 newly developed PAQs, and 65 studies examining 96 existing PAQs were included. Very few PAQs showed good results on both reliability and validity. Median reliability correlation coefficients were 0.62–0.71 for existing, and 0.74–0.76 for new PAQs. Median validity coefficients ranged from 0.30–0.39 for existing, and from 0.25–0.41 for new PAQs. Although the majority of PAQs appear to have acceptable reliability, the validity is moderate at best. Newly developed PAQs do not appear to perform substantially better than existing PAQs in terms of reliability and validity. Future PAQ studies should include measures of absolute validity and the error structure of the instrument.

  7. Construct and criterion validity of the Euro Qol-5D in patients with systemic lupus erythematosus.

    Science.gov (United States)

    Wang, Su-li; Wu, Bin; Zhu, Li-an; Leng, Lin; Bucala, Richard; Lu, Liang-jing

    2014-01-01

    To investigate the construct and criterion validity of the Euro Qol-5D (EQ-5D), which allows quality-adjusted life-years to be calculated, in patients with systemic lupus erythematosus (SLE). Consecutive SLE patients who had been followed at the Renji Hospital, School of Medicine, Shanghai Jiao Tong University were recruited. Cross-sectional correlations of the EQ-5D with equivalent domains in disease-specific health-related quality of life (HRQoL), LupusQol, Systemic Lupus Erythematosus Disease Activity Index (SLEDAI) measures, the Systemic Lupus International Collaborating Clinics Damage Index (SDI), and patient characteristics were tested. Discriminant validity to assess the ability to distinguish between patients of different disease severity was assessed. There also were evaluations of ceiling and floor effects. 240 patients were recruited in total. The EQ-5D correlated moderately to strongly with all domains of the LupusQoL (r: 0.44-0.7) apart from intimate relationships (r = 0.25) and body image (r = 0.18). There was moderate negative correlation between EQ-5D and clinical assessment of disease, SLEDAI (r = -0.589) and SDI (r = -0.509). When compared with equivalent domains on LupusQoL, there was good construct validity in EQ-5D (r: 0.631-0.812). EQ-5D could also discriminate patients with varied disease severity (according SLEDAI and SDI). There was no floor effect in EQ-5D but the ceiling effect remains strong (34%). Our results provide sufficient evidence that the EQ-5D displays construct and criterion validity for use in SLE patients. Disease-specific measures of HRQoL used alongside may be a better choice.

  8. The criterion-related validity of integrity tests: an updated meta-analysis.

    Science.gov (United States)

    Van Iddekinge, Chad H; Roth, Philip L; Raymark, Patrick H; Odle-Dusseau, Heather N

    2012-05-01

    Integrity tests have become a prominent predictor within the selection literature over the past few decades. However, some researchers have expressed concerns about the criterion-related validity evidence for such tests because of a perceived lack of methodological rigor within this literature, as well as a heavy reliance on unpublished data from test publishers. In response to these concerns, we meta-analyzed 104 studies (representing 134 independent samples), which were authored by a similar proportion of test publishers and non-publishers, whose conduct was consistent with professional standards for test validation, and whose results were relevant to the validity of integrity-specific scales for predicting individual work behavior. Overall mean observed validity estimates and validity estimates corrected for unreliability in the criterion (respectively) were .12 and .15 for job performance, .13 and .16 for training performance, .26 and .32 for counterproductive work behavior, and .07 and .09 for turnover. Although data on restriction of range were sparse, illustrative corrections for indirect range restriction did increase validities slightly (e.g., from .15 to .18 for job performance). Several variables appeared to moderate relations between integrity tests and the criteria. For example, corrected validities for job performance criteria were larger when based on studies authored by integrity test publishers (.27) than when based on studies from non-publishers (.12). In addition, corrected validities for counterproductive work behavior criteria were larger when based on self-reports (.42) than when based on other-reports (.11) or employee records (.15). (PsycINFO Database Record (c) 2012 APA, all rights reserved).

  9. Reliability and Criterion-Related Validity Testing (construct) of the Endotracheal Suction Assessment Tool (ESAT©).

    Science.gov (United States)

    Davies, K; Bulsara, M; Ramelet, A S; Monteroso, L

    2018-01-18

    To establish criterion-related construct validity and test-retest reliability for the Endotracheal Suction Assessment Tool© (ESAT©). Endotracheal tube suction performed in children can significantly affect clinical stability. Previously identified clinical indicators for endotracheal tube suction were used as criteria when designing the ESAT©. Content validity was reported previously. The final stages of psychometric testing are presented. Observational testing was used to measure construct validity and determine whether the ESAT© could guide 'inexperienced' paediatric intensive care nurses' decision-making regarding endotracheal tube suction. Test-retest reliability of the ESAT© was performed at two time points. The researchers and paediatric intensive care nurse 'experts' developed 10 hypothetical clinical scenarios with predetermined endotracheal tube suction outcomes. 'Experienced' (n=12) and 'inexperienced' (n=14) paediatric intensive care nurses were presented with the scenarios and the ESAT© guiding decision-making about whether to perform endotracheal tube suction for each scenario. Outcomes were compared with those predetermined by the 'experts' (n=9). Test-retest reliability of the ESAT© was measured at two consecutive time points (4 weeks apart) with 'experienced' and 'inexperienced' PIC nurses using the same scenarios and tool to guide decision-making. No differences were observed between endotracheal tube suction decisions made by 'experts' (n=9), 'inexperienced' (n=14) and 'experienced' (n=12) nurses confirming the tool's construct validity. No differences were observed between groups for endotracheal tube suction decisions at T1 and T2. Criterion-related construct validity and test-retest reliability of the ESAT© were demonstrated. Further testing is recommended to confirm reliability in the clinical setting with the 'inexperienced' nurse to guide decision-making related to endotracheal tube suction. This article is protected by copyright

  10. Evaluation of the intervertebral neck injury criterion using simulated rear impacts.

    Science.gov (United States)

    Panjabi, Manohar M; Ito, Shigeki; Ivancic, Paul C; Rubin, Wolfgang

    2005-08-01

    The Intervertebral Neck Injury Criterion (IV-NIC) is based on the hypothesis that intervertebral motion beyond the physiological limit may injure spinal soft tissues during whiplash, while the Neck Injury Criterion (NIC) hypothesizes that sudden changes in spinal fluid pressure may cause neural injury. Goals of the present study, using a biofidelic whole cervical spine model with muscle force replication, were to correlate IV-NIC with soft-tissue injury, determine the IV-NIC injury threshold, and compare IV-NIC and NIC. Using a bench-top apparatus, rear-impacts were simulated at 3.5, 5, 6.5, and 8 g horizontal accelerations of the T1 vertebra. Pre- and post-whiplash flexibility tests measured the soft tissue injury threshold, i.e. significant increases in the intervertebral neutral zone (NZ) or range of motion (ROM) above corresponding baseline values. Extension IV-NIC peaks correlated well with NZ and ROM increases at C0-C1 and at C3-C4 through C7-T1 (r=0.64 and 0.62 respectively, pNIC injury thresholds (95% confidence limits) varied among the intervertebral levels and ranged between 1.5 (1.1, 1.9) at C5-C6 and 3.4 (2.4, 4.4) at C7-T1. The NIC injury threshold was 8.7 (7.7, 9.7) m2/s2, substantially less than the proposed threshold of 15 m2/s2. Results support the use of IV-NIC for determining the cervical spine injury threshold and injury severity. Advantages of IV-NIC include the ability to predict the intervertebral level, mode, severity, and time of the cervical spine soft-tissue injury.

  11. OPTIMAL ESTIMATION OF RANDOM PROCESSES ON THE CRITERION OF MAXIMUM A POSTERIORI PROBABILITY

    Directory of Open Access Journals (Sweden)

    A. A. Lobaty

    2016-01-01

    Full Text Available The problem of obtaining the equations for the a posteriori probability density of a stochastic Markov process with a linear measurement model. Unlike common approaches based on consideration as a criterion for optimization of the minimum mean square error of estimation, in this case, the optimization criterion is considered the maximum a posteriori probability density of the process being evaluated.The a priori probability density estimated Gaussian process originally considered a differentiable function that allows us to expand it in a Taylor series without use of intermediate transformations characteristic functions and harmonic decomposition. For small time intervals the probability density measurement error vector, by definition, as given by a Gaussian with zero expectation. This makes it possible to obtain a mathematical expression for the residual function, which characterizes the deviation of the actual measurement process from its mathematical model.To determine the optimal a posteriori estimation of the state vector is given by the assumption that this estimate is consistent with its expectation – the maximum a posteriori probability density. This makes it possible on the basis of Bayes’ formula for the a priori and a posteriori probability density of an equation Stratonovich-Kushner.Using equation Stratonovich-Kushner in different types and values of the vector of drift and diffusion matrix of a Markov stochastic process can solve a variety of filtration tasks, identify, smoothing and system status forecast for continuous and for discrete systems. Discrete continuous implementation of the developed algorithms posteriori assessment provides a specific, discrete algorithms for the implementation of the on-board computer, a mobile robot system.

  12. Statistical learning theory for high dimensional prediction: Application to criterion-keyed scale development.

    Science.gov (United States)

    Chapman, Benjamin P; Weiss, Alexander; Duberstein, Paul R

    2016-12-01

    Statistical learning theory (SLT) is the statistical formulation of machine learning theory, a body of analytic methods common in "big data" problems. Regression-based SLT algorithms seek to maximize predictive accuracy for some outcome, given a large pool of potential predictors, without overfitting the sample. Research goals in psychology may sometimes call for high dimensional regression. One example is criterion-keyed scale construction, where a scale with maximal predictive validity must be built from a large item pool. Using this as a working example, we first introduce a core principle of SLT methods: minimization of expected prediction error (EPE). Minimizing EPE is fundamentally different than maximizing the within-sample likelihood, and hinges on building a predictive model of sufficient complexity to predict the outcome well, without undue complexity leading to overfitting. We describe how such models are built and refined via cross-validation. We then illustrate how 3 common SLT algorithms-supervised principal components, regularization, and boosting-can be used to construct a criterion-keyed scale predicting all-cause mortality, using a large personality item pool within a population cohort. Each algorithm illustrates a different approach to minimizing EPE. Finally, we consider broader applications of SLT predictive algorithms, both as supportive analytic tools for conventional methods, and as primary analytic tools in discovery phase research. We conclude that despite their differences from the classic null-hypothesis testing approach-or perhaps because of them-SLT methods may hold value as a statistically rigorous approach to exploratory regression. (PsycINFO Database Record (c) 2016 APA, all rights reserved).

  13. A Variable Block Insertion Heuristic for the Blocking Flowshop Scheduling Problem with Total Flowtime Criterion

    Directory of Open Access Journals (Sweden)

    Mehmet Fatih Tasgetiren

    2016-10-01

    Full Text Available In this paper, we present a variable block insertion heuristic (VBIH algorithm to solve the blocking flowshop scheduling problem with the total flowtime criterion. In the VBIH algorithm, we define a minimum and a maximum block size. After constructing the initial sequence, the VBIH algorithm starts with a minimum block size being equal to one. It removes the block from the current sequence and inserts it into the partial sequence sequentially with a predetermined move size. The sequence, which is obtained after several block moves, goes under a variable local search (VLS, which is based on traditional insertion and swap neighborhood structures. If the new sequence obtained after the VLS local search is better than the current sequence, it replaces the current sequence. As long as it improves, it keeps the same block size. However, if it does not improve, the block size is incremented by one and a simulated annealing-type of acceptance criterion is used to accept the current sequence. This process is repeated until the block size reaches at the maximum block size. Furthermore, we present a novel constructive heuristic, which is based on the profile fitting heuristic from the literature. The proposed constructive heuristic is able to further improve the best known solutions for some larger instances in a few seconds. Parameters of the constructive heuristic and the VBIH algorithm are determined through a design of experiment approach. Extensive computational results on the Taillard’s well-known benchmark suite show that the proposed VBIH algorithm outperforms the discrete artificial bee colony algorithm, which is one of the most efficient algorithms recently in the literature. Ultimately, 52 out of the 150 best known solutions are further improved with substantial margins.

  14. Self-discrepancy: Long-term test-retest reliability and test-criterion predictive validity.

    Science.gov (United States)

    Watson, Neill; Bryan, Brandon C; Thrash, Todd M

    2016-01-01

    Long-term test-retest reliability and predictive test-criterion evidence of validity of scores on measures of the real-ideal self-discrepancy and of the real-ought self-discrepancy were tested over periods of 1 year and 3 years. A sample of 184 undergraduates completed at 2 time points 1 year apart 3 instruments that each measure the 2 self-discrepancies: the idiographic Self-Concept Questionnaire-Personal Constructs, the nonidiographic Self-Concept Questionnaire-Conventional Constructs, and the content-free Abstract Measures. A separate sample of 141 undergraduates completed the instruments 3 years apart. Both samples completed 3 depression instruments and 3 anxiety instruments at the second time point. Results of analyses using latent variables modeled with 3 observed variables showed substantial statistically significant test-retest reliabilities and significant test-criterion prediction of anxiety and depression on the real-ideal and real-ought discrepancy measures over both time periods. Results for the observed variables showed significant 1-year and 3-year reliabilities for scores on all self-discrepancy measures, as well as significant 1-year and 3-year predictive validity for scores on all self-discrepancy measures, except the abstract measure of real-ought discrepancy in predicting scores on all depression measures and on at least 1 anxiety measure. The findings support very strong long-term stabilities of the self-discrepancy personality constructs and their long-term associations with anxiety and depression. (c) 2016 APA, all rights reserved).

  15. Occupation-specific screening for future sickness absence: criterion validity of the trucker strain monitor (TSM).

    Science.gov (United States)

    De Croon, Einar M; Blonk, Roland W B; Sluiter, Judith K; Frings-Dresen, Monique H W

    2005-02-01

    Monitoring psychological job strain may help occupational physicians to take preventive action at the appropriate time. For this purpose, the 10-item trucker strain monitor (TSM) assessing work-related fatigue and sleeping problems in truck drivers was developed. This study examined (1) test-retest reliability, (2) criterion validity of the TSM with respect to future sickness absence due to psychological health complaints and (3) usefulness of the TSM two-scales structure. The TSM and self-administered questionnaires, providing information about stressful working conditions (job control and job demands) and sickness absence, were sent to a random sample of 2000 drivers in 1998. Of the 1123 responders, 820 returned a completed questionnaire 2 years later (response: 72%). The TSM work-related fatigue scale, the TSM sleeping problems scale and the TSM composite scale showed satisfactory 2-year test-retest reliability (coefficient r=0.62, 0.66 and 0.67, respectively). The work-related fatigue, sleeping problems scale and composite scale had sensitivities of 61, 65 and 61%, respectively in identifying drivers with future sickness absence due to psychological health complaints. The specificity and positive predictive value of the TSM composite scale were 77 and 11%, respectively. The work-related fatigue scale and the sleeping problems scale were moderately strong correlated (r=0.62). However, stressful working conditions were differentially associated with the two scales. The results support the test-retest reliability, criterion validity and two-factor structure of the TSM. In general, the results suggest that the use of occupation-specific psychological job strain questionnaires is fruitful.

  16. Mammography image quality: model for predicting compliance with posterior nipple line criterion.

    Science.gov (United States)

    Spuur, Kelly; Hung, Wai Tak; Poulos, Ann; Rickard, Mary

    2011-12-01

    To develop a model using measurements of pectoral muscle width and length together with the acceptability of the posterior nipple line criteria (PNL) to predict the acceptability of the presentation of the pectoral muscle in the mediolateral oblique view of the breast. A total of 400 mediolateral oblique mammogram images were randomly selected from BreastScreen NSW South West, Australia. Measurements of length and width of the pectoral muscle and the acceptability of the pectoral muscle position relative to the PNL were recorded. Data analysis involved logistic regression and ROC analysis to test the predictors of width and length and the performance of the model. The model was then used to predict the outcome of acceptable or unacceptable PNL criterion for each case. The estimated odds ratio for an increase of 10mm was 1.98 (CI=1.68, 2.34) for the length predictor and 2.14 (CI=1.56, 2.93) for the width predictor. A cut off point of 0.6083 was derived from the training set and applied with the developed model to the test set. The area under the ROC curve was 0.9339 demonstrating an accurate model. This paper describes a model to predict the acceptability of the PNL criterion using the width and length of the pectoral muscle. This model could be used in the automated assessment of image quality which has the potential to enhance the consistency in mammographic image quality evaluation. Optimising image quality contributes to increased accuracy in radiological interpretation, which maximises the early detection of breast cancer and potentially reduces mortality rates. Copyright © 2010 Elsevier Ireland Ltd. All rights reserved.

  17. Uncertainty in detecting trend: a new criterion and its applications to global SST

    Science.gov (United States)

    Lian, Tao

    2017-10-01

    In most parts of the global ocean, the magnitude of the long-term linear trend in sea surface temperature (SST) is much smaller than the amplitude of multi-scale internal variation. One can thus use a specific period in a much longer record to arbitrarily determine the sign of long-term trend, which is statistically significant, in regional SST. This could lead to a controversial conclusion on how global SST responded to the anthropogenic forcing in the recent history. In this study, the uncertainty in the linear trend due to multi-scale internal variation is theoretically investigated. It is found that the "estimated" trend will not change its sign only when its magnitude is greater than a theoretical threshold that scales the influence from the multi-scale internal variation. Otherwise, the sign of the "estimated" trend may depend on the period used. The new criterion is found to be superior over the existing methods when the de-trended time series is dominated by the oscillatory term. Applying this new criterion to a global SST reconstruction from 1881 to 2013 reveals that the influences from multi-scale internal variation on the sign of "estimated" linear trend cannot be excluded in most parts of the Pacific, the southern Indian Ocean and the northern Atlantic; therefore, the warming or/and cooling trends found in these regions cannot be interpreted as the consequences of anthropogenic forcing. It's also suggested that the recent hiatus can be explained by combined uncertainty from internal variations at the interannual and decadal time scales.

  18. Experimentally Manipulating Items Informs on the (Limited) Construct and Criterion Validity of the Humor Styles Questionnaire.

    Science.gov (United States)

    Ruch, Willibald; Heintz, Sonja

    2017-01-01

    How strongly does humor (i.e., the construct-relevant content) in the Humor Styles Questionnaire (HSQ; Martin et al., 2003) determine the responses to this measure (i.e., construct validity)? Also, how much does humor influence the relationships of the four HSQ scales, namely affiliative, self-enhancing, aggressive, and self-defeating, with personality traits and subjective well-being (i.e., criterion validity)? The present paper answers these two questions by experimentally manipulating the 32 items of the HSQ to only (or mostly) contain humor (i.e., construct-relevant content) or to substitute the humor content with non-humorous alternatives (i.e., only assessing construct-irrelevant context). Study 1 (N = 187) showed that the HSQ affiliative scale was mainly determined by humor, self-enhancing and aggressive were determined by both humor and non-humorous context, and self-defeating was primarily determined by the context. This suggests that humor is not the primary source of the variance in three of the HQS scales, thereby limiting their construct validity. Study 2 (N = 261) showed that the relationships of the HSQ scales to the Big Five personality traits and subjective well-being (positive affect, negative affect, and life satisfaction) were consistently reduced (personality) or vanished (subjective well-being) when the non-humorous contexts in the HSQ items were controlled for. For the HSQ self-defeating scale, the pattern of relationships to personality was also altered, supporting an positive rather than a negative view of the humor in this humor style. The present findings thus call for a reevaluation of the role that humor plays in the HSQ (construct validity) and in the relationships to personality and well-being (criterion validity).

  19. Prediction of fracture initiation in square cup drawing of DP980 using an anisotropic ductile fracture criterion

    Science.gov (United States)

    Park, N.; Huh, H.; Yoon, J. W.

    2017-09-01

    This paper deals with the prediction of fracture initiation in square cup drawing of DP980 steel sheet with the thickness of 1.2 mm. In an attempt to consider the influence of material anisotropy on the fracture initiation, an uncoupled anisotropic ductile fracture criterion is developed based on the Lou—Huh ductile fracture criterion. Tensile tests are carried out at different loading directions of 0°, 45°, and 90° to the rolling direction of the sheet using various specimen geometries including pure shear, dog-bone, and flat grooved specimens so as to calibrate the parameters of the proposed fracture criterion. Equivalent plastic strain distribution on the specimen surface is computed using Digital Image Correlation (DIC) method until surface crack initiates. The proposed fracture criterion is implemented into the commercial finite element code ABAQUS/Explicit by developing the Vectorized User-defined MATerial (VUMAT) subroutine which features the non-associated flow rule. Simulation results of the square cup drawing test clearly show that the proposed fracture criterion is capable of predicting the fracture initiation with sufficient accuracy considering the material anisotropy.

  20. A review of the content, criterion-related, and construct-related validity of assessment center exercises.

    Science.gov (United States)

    Hoffman, Brian J; Kennedy, Colby L; LoPilato, Alexander C; Monahan, Elizabeth L; Lance, Charles E

    2015-07-01

    This study uses meta-analysis and a qualitative review of exercise descriptions to evaluate the content, criterion-related, construct, and incremental validity of 5 commonly used types of assessment center (AC) exercises. First, we present a meta-analysis of the relationship between 5 types of AC exercises with (a) the other exercise types, (b) the 5-factor model of personality, (c) general mental ability (GMA), and (d) relevant criterion variables. All 5 types of exercises were significantly related to criterion variables (ρ = .16-.19). The nomological network analyses suggested that the exercises tend to be modestly associated with GMA, Extraversion and, to a lesser extent, Openness to Experience but largely unrelated to Agreeableness, Conscientiousness, and Emotional Stability. Finally, despite sparse reporting in primary studies, a content analysis of exercise descriptions yielded some evidence of complexity, ambiguity, interpersonal interaction, and fidelity but not necessarily interdependence. (PsycINFO Database Record (c) 2015 APA, all rights reserved).

  1. A study on the instability criterion for the stratified flow in horizontal pipe at cocurrent flow conditions

    Energy Technology Data Exchange (ETDEWEB)

    Sung, Chang Kyung [Korea Electric Power Research Institute, Taejon (Korea, Republic of)

    1997-12-31

    This paper presents a theoretical approach of the instability criterion from stratified to nonstratified flow in horizontal pipe at cocurrent flow conditions. The new theoretical instability criterion for the stratified and nonstratified flow transition in horizontal pipe has been developed by hyperbolic equations in two-phase flow. Critical flow condition criterion and onset of slugging at cocurrent flow condition correspond to zero and imaginary characteristics which occur when the hyperbolicity of a stratified two-phase flow is broken, respectively. Through comparison between results predicted by the present flow is broken, respectively. Through comparison between results predicted by the present theory and the Kukita et al. [1] experimental data of pipes, it is shown that they are in good agreement with data. 4 refs., 2 figs. (Author)

  2. Assessment of Poliak-Jonas criterion for the onset of dynamic recrystallization in semi-solid deformation

    Science.gov (United States)

    Sheikh-Ansari, M. H.; Aghaie-Khafri, M.

    2017-10-01

    In the present investigation, the application of the Poliak-Jonas criterion in the semi-solid state has been evaluated. The evolution of grains by dynamic recrystallization during semi-solid forming was studied using electron backscatter diffraction (EBSD) analysis. The strain rate in the solid phase for each strain in terms of the overall strain rate, as well as the liquid fraction, was calculated based on the Gurson model. The numerical investigation revealed that the preliminaries of the Poliak-Jonas criterion are almost satisfied in the semi-solid deformation of alloys at low and moderate strain rates. However, there is less reliability regarding the criterion at high values of strain rates, where commonly used in industrial applications.

  3. Criterion-Related Validity of Sit-and-Reach Tests for Estimating Hamstring and Lumbar Extensibility: a Meta-Analysis

    Directory of Open Access Journals (Sweden)

    Daniel Mayorga-Vega

    2014-03-01

    Full Text Available The main purpose of the present meta-analysis was to examine the scientific literature on the criterion-related validity of sit-and-reach tests for estimating hamstring and lumbar extensibility. For this purpose relevant studies were searched from seven electronic databases dated up through December 2012. Primary outcomes of criterion-related validity were Pearson´s zero-order correlation coefficients (r between sit-and-reach tests and hamstrings and/or lumbar extensibility criterion measures. Then, from the included studies, the Hunter- Schmidt´s psychometric meta-analysis approach was conducted to estimate population criterion- related validity of sit-and-reach tests. Firstly, the corrected correlation mean (rp, unaffected by statistical artefacts (i.e., sampling error and measurement error, was calculated separately for each sit-and-reach test. Subsequently, the three potential moderator variables (sex of participants, age of participants, and level of hamstring extensibility were examined by a partially hierarchical analysis. Of the 34 studies included in the present meta-analysis, 99 correlations values across eight sit-and-reach tests and 51 across seven sit-and-reach tests were retrieved for hamstring and lumbar extensibility, respectively. The overall results showed that all sit-and-reach tests had a moderate mean criterion-related validity for estimating hamstring extensibility (rp = 0.46-0.67, but they had a low mean for estimating lumbar extensibility (rp = 0. 16-0.35. Generally, females, adults and participants with high levels of hamstring extensibility tended to have greater mean values of criterion-related validity for estimating hamstring extensibility. When the use of angular tests is limited such as in a school setting or in large scale studies, scientists and practitioners could use the sit-and-reach tests as a useful alternative for hamstring extensibility estimation, but not for estimating lumbar extensibility.

  4. A stationary criterion to identify the duration of efficient rainfalls to trigger shallow landslide

    Science.gov (United States)

    Vessia, G.; Parise, M.

    2012-04-01

    framework of a nationwide project by CNR-IRPI, under funds from the National Civil Department, the authors propose in this article a new criterion to identify from rain gauge measures the duration of the rainfalls triggering shallow landslides. The new criterion represents an attempt to identify the duration of the "effective rainfall event" responsible for the landslide occurrence, as reported by newspaper clips and/or in real time web newspapers. At this regard, antecedent precipitations are not taken into account, since the model considers only that amount of rainfall that effectively triggers the slope failure. The model analyses the hourly rainfall time series for at least one month before occurrence of the shallow landslide, using a historical landslide archive covering the time range between 2002 and 2011 in the Lazio Region, central Italy. This archive was obtained by a procedure consisting of the following steps: i) critical scrutiny of chronicles, ii) identification of the landslide site, and iii) retrieval of the rainfall data from the nearest rain gauge station within the pluviometric network provided by the National Department of Civil Protection. The proposed method, for each reported landslide, uses the cumulative function of the rainfall heights and rainfall intensity calculated for different time lag. Then, in order to identify the beginning of the effective rainfall event, two conditions have to be satisfied: (1) the difference in rainfall intensity between two adjacent windows must be very low, and (2) the time series of lack of rainfall must be stationary. When these conditions are met, the initial time of the efficient rainfall necessary to trigger the landslide is established. Such criterion is statistically based according to the rainfall time distribution only. No assumption is needed on the probabilistic distributions of time series of rain/not rain. Such approach has been successfully applied to medium-to-long rainfalls, for which rain/not rain

  5. A time step criterion for the stable numerical simulation of hydraulic fracturing

    Science.gov (United States)

    Juan-Lien Ramirez, Alina; Löhnert, Stefan; Neuweiler, Insa

    2017-04-01

    The process of propagating or widening cracks in rock formations by means of fluid flow, known as hydraulic fracturing, has been gaining attention in the last couple of decades. There is growing interest in its numerical simulation to make predictions. Due to the complexity of the processes taking place, e.g. solid deformation, fluid flow in an open channel, fluid flow in a porous medium and crack propagation, this is a challenging task. Hydraulic fracturing has been numerically simulated for some years now [1] and new methods to take more of its processes into account (increasing accuracy) while modeling in an efficient way (lower computational effort) have been developed in recent years. An example is the use of the Extended Finite Element Method (XFEM), whose application originated within the framework of solid mechanics, but is now seen as an effective method for the simulation of discontinuities with no need for re-meshing [2]. While more focus has been put to the correct coupling of the processes mentioned above, less attention has been paid to the stability of the model. When using a quasi-static approach for the simulation of hydraulic fracturing, choosing an adequate time step is not trivial. This is in particular true if the equations are solved in a staggered way. The difficulty lies within the inconsistency between the static behavior of the solid and the dynamic behavior of the fluid. It has been shown that too small time steps may lead to instabilities early into the simulation time [3]. While the solid reaches a stationary state instantly, the fluid is not able to achieve equilibrium with its new surrounding immediately. This is why a time step criterion has been developed to quantify the instability of the model concerning the time step. The presented results were created with a 2D poroelastic model, using the XFEM for both the solid and the fluid phases. An embedded crack propagates following the energy release rate criteria when the fluid pressure

  6. The One-Meter Criterion for Tsunami Warning: Time for a Reevaluation?

    Science.gov (United States)

    Fryer, G. J.; Weinstein, S.

    2013-12-01

    The U.S. tsunami warning centers issue warnings when runup is anticipated to exceed one meter. The origins of the one-meter criterion are unclear, though Whitmore, et al (2008) showed from tsunami history that one meter is roughly the threshold above which damage occurs. Recent experiences in Hawaii, however, suggest that the threshold could be raised. Tsunami Warnings were issued for 2010 Chile, 2011 Tohoku, and 2012 Haida Gwaii tsunamis; each exceeded one meter runup somewhere in the State. Evacuation, however, was necessary only in 2011, and even then onshore damage (as opposed to damage from currents) occurred only where runup exceeded 1.5m. During both Chile and Haida Gwaii tsunamis the existing criteria led to unnecessary evacuation. Maximum runup during the Chile tsunami was 1.1m at Hilo's Wailoa Boat Harbor, while the Haida Gwaii tsunami peaked at 1.2m at Honouliwai Bay on Molokai. Both tsunamis caused only minor damage and minimal flooding; in both cases a Tsunami Advisory (i.e., there is no need to evacuate, but stay off the beach and out of the water) would have been adequate. The Advisory was originally developed as an ad hoc response to the mildly threatening 2006 Kuril tsunami and has since been formalized as the product we issue when maximum runup is expected to be 0.3-1.0 m. At the time it was introduced, however, there was no discussion that this new low-level warning might allow the criterion for Tsunami Warning itself to be adjusted. We now suggest that the divide between Advisory and Warning be raised from 1.0 to something greater, possibly 1.2m. If the warning threshold were raised to 1.2m, the over-warning for the Chile tsunami still could not have been avoided. Models calibrated against DART data consistently forecast runup just over 1.2m for that event. For Haida Gwaii, adjusting the models to match the DART data increased the forecast runup to almost 2m, which again meant a warning, though in retrospect we should have been skeptical. The

  7. Three-dimensional gamma criterion for patient-specific quality assurance of spot scanning proton beams.

    Science.gov (United States)

    Chang, Chang; Poole, Kendra L; Teran, Anthony V; Luckman, Scott; Mah, Dennis

    2015-09-08

    The purpose of this study was to evaluate the effectiveness of full three-dimensional (3D) gamma algorithm for spot scanning proton fields, also referred to as pencil beam scanning (PBS) fields. The difference between the full 3D gamma algorithm and a simplified two-dimensional (2D) version was presented. Both 3D and 2D gamma algorithms are used for dose evaluations of clinical proton PBS fields. The 3D gamma algorithm was implemented in an in-house software program without resorting to 2D interpolations perpendicular to the proton beams at the depths of measurement. Comparison between calculated and measured dose points was car-ried out directly using Euclidian distance in 3D space and the dose difference as a fourth dimension. Note that this 3D algorithm faithfully implemented the original concept proposed by Low et al. (1998) who described gamma criterion using 3D Euclidian distance and dose difference. Patient-specific proton PBS plans are separated into two categories, depending on their optimization method: single-field optimization (SFO) or multifield optimized (MFO). A total of 195 measurements were performed for 58 SFO proton fields. A MFO proton plan with four fields was also calculated and measured, although not used for treatment. Typically three dif-ferent depths were selected from each field for measurements. Each measurement was analyzed by both 3D and 2D gamma algorithms. The resultant 3D and 2D gamma passing rates are then compared and analyzed. Comparison between 3D and 2D gamma passing rates of SFO fields showed that 3D algorithm does show higher passing rates than its 2D counterpart toward the distal end, while little difference is observed at depths away from the distal end. Similar phenomenon in the lateral penumbra was well documented in photon radiation therapy, and in fact brought about the concept of gamma criterion. Although 2D gamma algorithm has been shown to suffice in addressing dose comparisons in lateral penumbra for photon

  8. The role of decision criterion in the Deese-Roediger-McDermott (DRM) false recognition memory: False memory falls and rises as a function of restriction on criterion setting.

    Science.gov (United States)

    Jou, Jerwen; Escamilla, Eric E; Arredondo, Mario L; Pena, Liann; Zuniga, Richard; Perez, Martin; Garcia, Clarissa

    2016-11-23

    How much of the Deese-Roediger-McDermott (DRM) false memory is attributable to decision criterion is so far a controversial issue. Previous studies typically used explicit warnings against accepting the critical lure to investigate this issue. The assumption is that if the false memory results from using a liberally biased criterion, it should be greatly reduced or eliminated by an explicit warning against accepting the critical lure. Results showed that warning was generally ineffective. We asked the question of whether subjects can substantially reduce false recognition without being warned when the test forces them to make a distinction between true and false memories. Using a two-alternative forced choice in which criterion plays a relatively smaller role, we showed that subjects could indeed greatly reduce the rate of false recognition. However, when the forced-choice restriction was removed from the two-item choice test, the rate of false recognition rebounded to that of the hit for studied list words, indicating the role of criterion in false recognition.

  9. Reliability and criterion validity of self-measured waist, hip, and neck circumferences

    Directory of Open Access Journals (Sweden)

    Pamela Barrios

    2016-05-01

    Full Text Available Abstract Background Waist, hip, and neck circumference measurements are cost-effective, non-invasive, useful markers for body fat distribution and disease risk. For epidemiology and intervention studies, including body circumference measurements in self-report surveys could be informative. However, few studies have assessed the test-retest reliability and criterion validity of a self-report tool feasible for use in large scale studies. Methods At home, mothers of young children viewed a brief, online instructional video on how to measure their waist, hip, and neck circumferences. Afterwards, they created a homemade paper measuring tape from a downloaded file with scissors and tape, took all measurements in duplicate, and entered them into an online survey. A few weeks later, participants visited an anthropometrics lab where they measured themselves again, and trained technicians (n = 9 measured participants in duplicate using standard equipment and procedures. To assess differences between self- and technician-measured circumferences, duplicate measurements for participant home self-measurements, participant lab self-measurements, and technician measurements each were averaged and Wilcoxon signed-rank tests conducted. Agreement between all possible pairs of measurements were examined using Intraclass Correlations (ICCs and Bland-Altman plots. Results Participants (n = 41; aged 38.05 ± 3.54SD years; 71 % white were all mothers that had at least one child under the age of 12 yrs. Technical error of measurements for self- and technician- duplicate measurements varied little (0.08 to 0.76 inches and had very high reliability (≥0.90. Intraclass Correlations (ICC comparing self vs technician were high (0.97, 0.96, and 0.84 for waist, hip, and neck. Comparison of self-measurements at home vs lab revealed high test-retest reliability (ICC ≥ 0.87. Differences between participant self- and technician measurements were small (i

  10. Are improvements in assessment center construct-related validity paralleled by improvements in criterion-related validity? The effects of exercise similarity on assessment center validity

    OpenAIRE

    Wirz A. Melchers K. G. Schultheiss S. & Kleinmann M.

    2014-01-01

    Previous studies have found that factors that improved assessment center (AC) construct related validity also had beneficial effects on criterion related validity. However some factors might have diverging effects on construct and criterion related validity. Accordingly we followed recent calls to evaluate construct and criterion related validity of ACs simultaneously by examining the effects of the factor exercise similarity on both aspects of validity within a single study. Data were coll...

  11. Static properties and multiaxial strength criterion for design of composite automotive structures

    Energy Technology Data Exchange (ETDEWEB)

    Ruggles, M.B.; Yahr, G.T.; Battiste, R.L.

    1998-11-01

    The Durability of Lightweight Composite Structures Project was established at Oak Ridge National Laboratory (ORNL) by the US Department of Energy to provide the experimentally-based, durability-driven design guidelines necessary to assure long-term structural integrity of automotive composite components. The initial focus of the ORNL Durability Project was on one representative reference material -- an isocyanurate (polyurethane) reinforced with continuous strand, swirl-mat E-glass. The present paper describes tensile, compressive, flexure, and shear testing and results for the reference composite. Behavioral trends and proportional limit are established for both tension and compression. Damage development due to tensile loading, strain rate effects, and effects of temperature are discussed. Furthermore, effects on static properties of various fluids, including water at room and elevated temperatures, salt water, antifreeze, windshield washer fluid, used motor oil, battery acid, gasoline, and brake fluid, were investigated. Effects of prior loading were evaluated as well. Finally, the effect of multiaxial loading on strength was determined, and the maximum shear strength criterion was identified for design.

  12. A criterion based audit of the management of obstructed labour in Malawi.

    Science.gov (United States)

    Kongnyuy, Eugene Justine; Mlava, Grace; van den Broek, Nynke

    2009-05-01

    To assess and improve the management of obstructed labour in maternity units in Malawi. A criterion based audit of the management of obstructed labour was conducted in 8 hospitals in three districts in Malawi. Management practices were: (a) assessed by a retrospective review of 44 cases notes, and (b) compared with local standards established, by a multidisciplinary team, based on the Malawi Ministry of Health guidelines and World Health Organisation manuals. Gaps in current practice were identified, reasons discussed, and recommendations made and implemented. A re-audit (41 case notes) was conducted 3 months later. There were significant improvements in the attainment of four standards: draining of urinary bladder (70.5 vs. 90.2%; P = 0.022), administration of broad spectrum antibiotics (72.7 vs. 90.2%; P = 0.039), commencement of Caesarean section within 1 hour or delivery of the foetus within 2 h of diagnosis (38.6 vs. 61.0%; P = 0.023), and maintaining an observation chart (45.5 vs. 61.0%; P audit can improve the management of obstructed labour in countries with limited resources.

  13. A new uniqueness criterion for the number of periodic orbits of Abel equations

    Science.gov (United States)

    Álvarez, M. J.; Gasull, A.; Giacomini, H.

    A solution of the Abel equation x˙=A(t)x+B(t)x such that x(0)=x(1) is called a periodic orbit of the equation. Our main result proves that if there exist two real numbers a and b such that the function aA(t)+bB(t) is not identically zero, and does not change sign in [0,1] then the Abel differential equation has at most one non-zero periodic orbit. Furthermore, when this periodic orbit exists, it is hyperbolic. This result extends the known criteria about the Abel equation that only refer to the cases where either A(t)≢0 or B(t)≢0 does not change sign. We apply this new criterion to study the number of periodic solutions of two simple cases of Abel equations: the one where the functions A(t) and B(t) are 1-periodic trigonometric polynomials of degree one and the case where these two functions are polynomials with three monomials. Finally, we give an upper bound for the number of isolated periodic orbits of the general Abel equation x˙=A(t)x+B(t)x+C(t)x, when A(t), B(t) and C(t) satisfy adequate conditions.

  14. On signal design by the R sub 0 criterion for non-white Gaussian noise channels

    Science.gov (United States)

    Bordelon, D. L.

    1976-01-01

    The use of the R sub 0 criterion for modulation system design is investigated for channels with non-white Gaussian noise. A signal space representation of the waveform channel is developed, and the cut-off rate R sub 0 for vector channels with additive nonwhite Gaussian noise and unquantized demodulation is derived. When the signal unput to the channel is a continuous random vector, maximization of R sub 0 with constrained average signal energy leads to a water-filling interpretation of optimal energy distribution in signal space. The necessary condition for a finite signal set to maximize R sub 0 with constrained energy and an equally likely probability assignment of signal vectors is presented, and an algorithm is outlined for numerically computing the optimum signal set. A necessary condition on a constrained energy, finite signal set is found which maximizes a Taylor series approximation of R sub 0. This signal set is compared with the finite signal set which has the water-filling average energy distribution.

  15. Test-retest reliability and criterion validity of a new Taekwondo anaerobic intermittent kick test.

    Science.gov (United States)

    Tayech, Amel; Mejri, Mohamed A; Chaabene, Helmi; Chaouachi, Mehdi; Behm, David G; Chaouachi, Anis

    2018-01-04

    The aim of this study was to determine the relative and absolute test-retest reliability and criterion validity of a new Taekwondo anaerobic intermittent kick test (TAIKT). Twenty Tunisian elite Taekwondo athletes participated in this study (15 males and 5 females). Participants performed the TAIKT and the Running-based Anaerobic Sprint Test (RAST), twice (test and retest), on separate occasions three-week apart. Peak heart rate (HRpeak), blood lactate concentration [La־], and rating of perceived exertion (RPE) were measured during each session. There was no significant difference between the test and retest of TAIKT and RAST for all performances and physiological variables, except for the absolute mean power (Pmean) of RAST. Test-retest results showed that the TAIKT and RAST were reliable. All TAIKT and RAST parameters had an ICC>0.90, SEMRAST parameters (Ppeak (r=0.81; r=0.70), Pmean (r=0.72; r=0.60) in (W and W·Kg-67 respectively), fatigue index (r=0.81), [La־] (r=0.89) and RPE (r=0.78) at Ptest for assessing anaerobic power of Taekwondo athletes.

  16. A Criterion to Control Nonlinear Error in the Mixed-Mode Bending Test

    Science.gov (United States)

    Reeder, James R.

    2002-01-01

    The mixed-mode bending test ha: been widely used to measure delamination toughness and was recently standardized by ASTM as Standard Test Method D6671-01. This simple test is a combination of the standard Mode I (opening) test and a Mode II (sliding) test. This test uses a unidirectional composite test specimen with an artificial delamination subjected to bending loads to characterize when a delamination will extend. When the displacements become large, the linear theory used to analyze the results of the test yields errors in the calcu1ated toughness values. The current standard places no limit on the specimen loading and therefore test data can be created using the standard that are significantly in error. A method of limiting the error that can be incurred in the calculated toughness values is needed. In this paper, nonlinear models of the MMB test are refined. One of the nonlinear models is then used to develop a simple criterion for prescribing conditions where thc nonlinear error will remain below 5%.

  17. A Novel Non-Invasive Selection Criterion for the Preservation of Primitive Dutch Konik Horses

    Directory of Open Access Journals (Sweden)

    Sharon May-Davis

    2018-02-01

    Full Text Available The Dutch Konik is valued from a genetic conservation perspective and also for its role in preservation of natural landscapes. The primary management objective for the captive breeding of this primitive horse is to maintain its genetic purity, whilst also maintaining the nature reserves on which they graze. Breeding selection has traditionally been based on phenotypic characteristics consistent with the breed description, and the selection of animals for removal from the breeding program is problematic at times due to high uniformity within the breed, particularly in height at the wither, colour (mouse to grey dun and presence of primitive markings. With the objective of identifying an additional non-invasive selection criterion with potential uniqueness to the Dutch Konik, this study investigates the anatomic parameters of the distal equine limb, with a specific focus on the relative lengths of the individual splint bones. Post-mortem dissections performed on distal limbs of Dutch Konik (n = 47 and modern domesticated horses (n = 120 revealed significant differences in relation to the length and symmetry of the 2nd and 4th Metacarpals and Metatarsals. Distal limb characteristics with apparent uniqueness to the Dutch Konik are described which could be an important tool in the selection and preservation of the breed.

  18. Development of a Model for Dynamic Recrystallization Consistent with the Second Derivative Criterion

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    Muhammad Imran

    2017-11-01

    Full Text Available Dynamic recrystallization (DRX processes are widely used in industrial hot working operations, not only to keep the forming forces low but also to control the microstructure and final properties of the workpiece. According to the second derivative criterion (SDC by Poliak and Jonas, the onset of DRX can be detected from an inflection point in the strain-hardening rate as a function of flow stress. Various models are available that can predict the evolution of flow stress from incipient plastic flow up to steady-state deformation in the presence of DRX. Some of these models have been implemented into finite element codes and are widely used for the design of metal forming processes, but their consistency with the SDC has not been investigated. This work identifies three sources of inconsistencies that models for DRX may exhibit. For a consistent modeling of the DRX kinetics, a new strain-hardening model for the hardening stages III to IV is proposed and combined with consistent recrystallization kinetics. The model is devised in the Kocks-Mecking space based on characteristic transition in the strain-hardening rate. A linear variation of the transition and inflection points is observed for alloy 800H at all tested temperatures and strain rates. The comparison of experimental and model results shows that the model is able to follow the course of the strain-hardening rate very precisely, such that highly accurate flow stress predictions are obtained.

  19. A Business Process Management System based on a General Optimium Criterion

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    Vasile MAZILESCU

    2009-01-01

    Full Text Available Business Process Management Systems (BPMS provide a broadrange of facilities to manage operational business processes. These systemsshould provide support for the complete Business Process Management (BPMlife-cycle [16]: (redesign, configuration, execution, control, and diagnosis ofprocesses. BPMS can be seen as successors of Workflow Management (WFMsystems. However, already in the seventies people were working on officeautomation systems which are comparable with today’s WFM systems.Recently, WFM vendors started to position their systems as BPMS. Our paper’sgoal is a proposal for a Tasks-to-Workstations Assignment Algorithm (TWAAfor assembly lines which is a special implementation of a stochastic descenttechnique, in the context of BPMS, especially at the control level. Both cases,single and mixed-model, are treated. For a family of product models having thesame generic structure, the mixed-model assignment problem can be formulatedthrough an equivalent single-model problem. A general optimum criterion isconsidered. As the assembly line balancing, this kind of optimisation problemleads to a graph partitioning problem meeting precedence and feasibilityconstraints. The proposed definition for the "neighbourhood" function involvesan efficient way for treating the partition and precedence constraints. Moreover,the Stochastic Descent Technique (SDT allows an implicit treatment of thefeasibility constraint. The proposed algorithm converges with probability 1 toan optimal solution.

  20. Numerical Prediction of the Parameters of a Yield Criterion for Fibrous Composites

    Science.gov (United States)

    Małachowski, E.; L'vov, G.; Daryazadeh, S.

    2017-11-01

    A numerical procedure is developed for predicting the parameters of a yield criterion for metal-matrix composites on the basis of known mechanical properties of the matrix and fibers. The macrocriterion of yielding is taken in the form of an invariant quadratic function of average stresses, with the use of a fourth-rank tensor. Transition to the plastic state is fixed using a FEM analysis of the distribution of stresses within the minimum representative volume of composite. A new procedure to simulate the periodicity conditions for the representative volume at a uniform average stress state of composite is proposed. A numerical analysis showed that the structure of yield function has to reflect the possibility of plastic deformations of composite in hydrostatic macroloading even if the matrix and fibers do not deform plastically at such a loading. For an orthogonally reinforced boron-aluminum composite, components of its yield tensor are determined, and convexity of the yield surface is established. Yield surfaces are constructed for different plane stress states of the composite.

  1. Emotional intelligence: an admission criterion alternative to cumulative grade point averages for prelicensure students.

    Science.gov (United States)

    Jones-Schenk, Jan; Harper, Mary G

    2014-03-01

    Predicting potential student success is of great interest to nursing educators and academic administrators alike. Cumulative grade point average (CGPA) has traditionally been used to screen nursing program candidates, but CGPA itself has shown to have no statistically significant predictive value and may in fact screen out individuals who possess social intelligence attributes that are essential for success in nursing practice. The purpose of this study is to determine if students whose emotional intelligence characteristics meet or exceed those of successful staff nurses are more likely to be successful in a baccalaureate nursing program. A descriptive, correlational design was used to compare the emotional intelligence attributes of 116 potential nursing students and 42 successful staff nurses using the Emotional Quotient Inventory (EQ-i). Nursing students who remained in the nursing program were found to have significantly higher levels of total emotional intelligence, interpersonal capacity, and stress tolerance. Students who dropped from the nursing program were not significantly different from successful staff nurses in terms of emotional intelligence. Emotional intelligence presents a compelling adjunct to current selection criteria for nursing students. However, the lack of research prevents widespread adoption of this criterion. This study suggests that students with higher levels of emotional intelligence, particularly intrapersonal capacity and stress tolerance, are more likely to be successful in a baccalaureate nursing program than students with lower levels. Further research is needed to determine the usefulness of EI as a predictor of student success in nursing programs. Copyright © 2013 Elsevier Ltd. All rights reserved.

  2. Cancer as a Criterion A Traumatic Stressor for Veterans: Prevalence and Correlates

    Science.gov (United States)

    Mulligan, Elizabeth A.; Wachen, Jennifer Schuster; Naik, Aanand D.; Gosian, Jeffrey; Moye, Jennifer

    2015-01-01

    The diagnosis of cancer is an uncontrollable stressor posing the threat of death and disfigurement, often followed by repeated exposure to aversive reminders in the form of noxious treatments, persisting side effects, reengagement at times of surveillance, and the threat of recurrence. The phenomenon of cancer as a traumatic stressor is explored in this study, with a focus on the prevalence and correlates of posttraumatic stress disorder (PTSD) Criterion A in a sample of 170 mostly male adults who received health care at VA Medical Centers in Boston or Houston. Participants were interviewed 6 months after diagnosis with head and neck, gastro-esophageal, or colorectal cancers. Approximately half–42.9% to 65.9% depending on cut-score used—perceived cancer to be a traumatic stressor involving actual/threatened death or injury or threat to physical integrity as well as fear, helplessness, or horror. Younger veterans and those with current combat PTSD symptoms were more likely to perceive cancer as a traumatic stressor, as were those who perceived their prognosis as uncertain; 12% had PTSD symptoms above a PCLC cut score of 50, which is similar to incidence rates of PTSD associated with other traumatic stressors. Cancer, therefore, appears to be a serious and for some, traumatic stressor, suggesting the importance of screening for cancer related PTSD in cancer survivors, particularly those most at risk. PMID:25741406

  3. Russian Federation regions classification according to criterion of self-developing

    Directory of Open Access Journals (Sweden)

    Ekaterina Aleksandrovna Zakharchuk

    2011-09-01

    Full Text Available This paper presents the results of selecting the regions of the Russian Federation according to two criteria of self-development - gross domestic product and financial balance of the territory. 30 regions of Russia showed the dynamics of the GRP growth comparable to or higher than in Russia as a whole, the central part and north-west parts of Russia keep the leadership on the number of self-developing regions on the criterion of the GRP. The outsiders of regional economic development are Volga, Ural, Siberian and Far East Federal Districts. Of 83 subjects of Russian Federation in total, in 38 an excessive level of taxes and other obligatory payments to budgets of all levels of government expenditure of the territories was observed. Based on the author's calculations, a classification of Russian regions on the type of economic development of the areas has been made into four types: self-developing regions, developing territories, financially stable territories and under-developed regions. A classification of self-developing regions on the type of economic development is made; resource-isolated, agricultural, managing and organically developing territories within the Russian Federation are defined.

  4. Criterion analysis and content validity for standardized behavioral tests in a detector-dog breeding program.

    Science.gov (United States)

    Rocznik, Dorothee; Sinn, David L; Thomas, Scott; Gosling, Samuel D

    2015-01-01

    Many working-dog programs assess behavior during a dog's first year of life with the aim of predicting success in the field. However, decisions about which tests to administer are frequently made on the basis of tradition or intuition. This study reports results from a survey given to U.S.A.'s Transportation Security Administration (TSA) detection-dog handlers (N = 34). We categorized and summarized handlers' responses regarding traits they felt were important for work. We used this criterion analysis to examine the content validity of the TSA's puppy tests. Results indicate that 13 of 15 traits that are currently being measured are relevant. However, several traits not currently measured were identified as being highly important, notably "play" and off-duty "calmness." These results provide support that the TSA tests are measuring traits relevant to operational search team performance but also highlight other traits that may be profitable to assess in this and other detection-dog programs. © 2014 American Academy of Forensic Sciences.

  5. Asymptotic Effectiveness of the Event-Based Sampling According to the Integral Criterion

    Directory of Open Access Journals (Sweden)

    Marek Miskowicz

    2007-01-01

    Full Text Available A rapid progress in intelligent sensing technology creates new interest in a development of analysis and design of non-conventional sampling schemes. The investigation of the event-based sampling according to the integral criterion is presented in this paper. The investigated sampling scheme is an extension of the pure linear send-on- delta/level-crossing algorithm utilized for reporting the state of objects monitored by intelligent sensors. The motivation of using the event-based integral sampling is outlined. The related works in adaptive sampling are summarized. The analytical closed-form formulas for the evaluation of the mean rate of event-based traffic, and the asymptotic integral sampling effectiveness, are derived. The simulation results verifying the analytical formulas are reported. The effectiveness of the integral sampling is compared with the related linear send-on-delta/level-crossing scheme. The calculation of the asymptotic effectiveness for common signals, which model the state evolution of dynamic systems in time, is exemplified.

  6. Diagonal recurrent neural network based adaptive control of nonlinear dynamical systems using lyapunov stability criterion.

    Science.gov (United States)

    Kumar, Rajesh; Srivastava, Smriti; Gupta, J R P

    2017-03-01

    In this paper adaptive control of nonlinear dynamical systems using diagonal recurrent neural network (DRNN) is proposed. The structure of DRNN is a modification of fully connected recurrent neural network (FCRNN). Presence of self-recurrent neurons in the hidden layer of DRNN gives it an ability to capture the dynamic behaviour of the nonlinear plant under consideration (to be controlled). To ensure stability, update rules are developed using lyapunov stability criterion. These rules are then used for adjusting the various parameters of DRNN. The responses of plants obtained with DRNN are compared with those obtained when multi-layer feed forward neural network (MLFFNN) is used as a controller. Also, in example 4, FCRNN is also investigated and compared with DRNN and MLFFNN. Robustness of the proposed control scheme is also tested against parameter variations and disturbance signals. Four simulation examples including one-link robotic manipulator and inverted pendulum are considered on which the proposed controller is applied. The results so obtained show the superiority of DRNN over MLFFNN as a controller. Copyright © 2017 ISA. Published by Elsevier Ltd. All rights reserved.

  7. Test-day milk yield as a selection criterion for dairy buffaloes (Bubalus bubalis Artiodactyla, Bovidae

    Directory of Open Access Journals (Sweden)

    Humberto Tonhati

    2008-01-01

    Full Text Available Due to the great demand for buffalo milk by-products the interest in technical-scientific information about this species is increasing. Our objective was to propose selection criteria for milk yield in buffaloes based on total milk yield, 305-day milk yield (M305, and test-day milk yield. A total of 3,888 lactations from 1,630 Murrah (Bubalus bubalis cows recorded between 1987 and 2001, from 10 herds in the State of São Paulo, Brazil, were analyzed. Covariance components were obtained using the restricted maximum likelihood method applied to a bivariate animal model. Additive genetic and permanent environmental effects were considered as random, and contemporary group and lactation order as fixed effects. The heritability estimates were 0.22 for total milk yield and 0.19 for M305. For test-day yields, the heritability estimates ranged from 0.12 to 0.30, with the highest values being observed up to the third test month, followed by a decline until the end of lactation. The present results show that test-day milk yield, mainly during the first six months of lactation, could be adopted as a selection criterion to increase total milk yield.

  8. Decision Trees for Continuous Data and Conditional Mutual Information as a Criterion for Splitting Instances.

    Science.gov (United States)

    Drakakis, Georgios; Moledina, Saadiq; Chomenidis, Charalampos; Doganis, Philip; Sarimveis, Haralambos

    2016-01-01

    Decision trees are renowned in the computational chemistry and machine learning communities for their interpretability. Their capacity and usage are somewhat limited by the fact that they normally work on categorical data. Improvements to known decision tree algorithms are usually carried out by increasing and tweaking parameters, as well as the post-processing of the class assignment. In this work we attempted to tackle both these issues. Firstly, conditional mutual information was used as the criterion for selecting the attribute on which to split instances. The algorithm performance was compared with the results of C4.5 (WEKA's J48) using default parameters and no restrictions. Two datasets were used for this purpose, DrugBank compounds for HRH1 binding prediction and Traditional Chinese Medicine formulation predicted bioactivities for therapeutic class annotation. Secondly, an automated binning method for continuous data was evaluated, namely Scott's normal reference rule, in order to allow any decision tree to easily handle continuous data. This was applied to all approved drugs in DrugBank for predicting the RDKit SLogP property, using the remaining RDKit physicochemical attributes as input.

  9. Joint Source and Relay Precoding Designs for MIMO Two-Way Relaying Based on MSE Criterion

    CERN Document Server

    Wang, Rui

    2011-01-01

    Properly designed precoders can significantly improve the spectral efficiency of multiple-input multiple-output (MIMO) relay systems. In this paper, we investigate joint source and relay precoding design based on the mean-square-error (MSE) criterion in MIMO two-way relay systems, where two multi-antenna source nodes exchange information via a multi-antenna amplify-and-forward relay node. This problem is non-convex and its optimal solution remains unsolved. Aiming to find an efficient way to solve the problem, we first decouple the primal problem into three tractable sub-problems, and then propose an iterative precoding design algorithm based on alternating optimization. The solution to each sub-problem is optimal and unique, thus the convergence of the iterative algorithm is guaranteed. Secondly, we propose a structured precoding design to lower the computational complexity. The proposed precoding structure is able to parallelize the channels in the multiple access (MAC) phase and broadcast (BC) phase. It th...

  10. Blasting Vibration Safety Criterion Analysis with Equivalent Elastic Boundary: Based on Accurate Loading Model

    Directory of Open Access Journals (Sweden)

    Qingwen Li

    2015-01-01

    Full Text Available In the tunnel and underground space engineering, the blasting wave will attenuate from shock wave to stress wave to elastic seismic wave in the host rock. Also, the host rock will form crushed zone, fractured zone, and elastic seismic zone under the blasting loading and waves. In this paper, an accurate mathematical dynamic loading model was built. And the crushed zone as well as fractured zone was considered as the blasting vibration source thus deducting the partial energy for cutting host rock. So this complicated dynamic problem of segmented differential blasting was regarded as an equivalent elastic boundary problem by taking advantage of Saint-Venant’s Theorem. At last, a 3D model in finite element software FLAC3D accepted the constitutive parameters, uniformly distributed mutative loading, and the cylindrical attenuation law to predict the velocity curves and effective tensile curves for calculating safety criterion formulas of surrounding rock and tunnel liner after verifying well with the in situ monitoring data.

  11. Non-operative treatment approach for blunt splenic injury: is grade the unique criterion?

    Science.gov (United States)

    Koca, Bülent; Topgül, Koray; Yürüker, Saim Savaş; Cınar, Hamza; Kuru, Bekir

    2013-07-01

    We aimed to investigate the results of a non-operative approach to blunt spleen injury to re-evaluate the importance of injury grade. Thirty-one blunt splenic trauma cases subjected to non-operative treatment were evaluated retrospectively. The patients were classified into two groups as isolated spleen trauma (ST) group and multi-trauma (MT) group. The hospitalization and blood replacement needs, success of non-operative follow-up, and post-traumatic complications were compared between the two groups. The patients were evaluated via follow-up abdominal ultrasonography (US) and computerized tomography (CT). The results were evaluated with regard to post-splenic trauma complications. According to the organ injury scale of the American Association for the Surgery of Trauma, 25.8% were grade-1, 32.2% grade-2, 29% grade-3, and 12.9% grade-4 injuries. It was observed that the transfusion amount was directly proportional to the injury grade. All patients with grade-4 injury and 14 patients with MT were treated successfully with the non-operative method. Splenic pseudoaneurysm developed in one patient in the MT group. One patient was diagnosed with late splenic rupture. Hemodynamic stability is the most important criterion for the indication of non-operative treatment. However, in well-selected cases, patients with grade 4 splenic traumas and those with extra-splenic injuries could also be treated successfully with the non-operative method.

  12. Stability Criterion of Linear Stochastic Systems Subject to Mixed H2/Passivity Performance

    Directory of Open Access Journals (Sweden)

    Cheung-Chieh Ku

    2015-01-01

    Full Text Available The H2 control scheme and passivity theory are applied to investigate the stability criterion of continuous-time linear stochastic system subject to mixed performance. Based on the stochastic differential equation, the stochastic behaviors can be described as multiplicative noise terms. For the considered system, the H2 control scheme is applied to deal with the problem on minimizing output energy. And the asymptotical stability of the system can be guaranteed under desired initial conditions. Besides, the passivity theory is employed to constrain the effect of external disturbance on the system. Moreover, the Itô formula and Lyapunov function are used to derive the sufficient conditions which are converted into linear matrix inequality (LMI form for applying convex optimization algorithm. Via solving the sufficient conditions, the state feedback controller can be established such that the asymptotical stability and mixed performance of the system are achieved in the mean square. Finally, the synchronous generator system is used to verify the effectiveness and applicability of the proposed design method.

  13. A criterion to identify the equilibration time in lipid bilayer simulations

    Directory of Open Access Journals (Sweden)

    Rodolfo D. Porasso

    2012-11-01

    Full Text Available With the aim of establishing a criterion for identifying when a lipid bilayer has reached steady state using the molecular dynamics simulation technique, lipid bilayers of different composition in their liquid crystalline phase were simulated in aqueous solution in presence of CaCl_2 as electrolyte, at different concentration levels. In this regard, we used two different lipid bilayer systems: one composed by 288 DPPC (DiPalmitoylPhosphatidylCholine and another constituted by 288 DPPS (DiPalmitoylPhosphatidylSerine. In this sense, for both type of lipid bilayers, we have studied the temporal evolution of some lipids properties, such as the surface area per lipid, the deuterium order parameter, the lipid hydration and the lipid-calcium coordination. From their analysis, it became evident how each property has a different time to achieve equilibrium. The following order was found, from faster property to slower property: coordination of ions $approx$ deuterium order parameter > area per lipid $approx$ hydration. Consequently, when the hydration of lipids or the mean area per lipid are stable, we can ensure that the lipid membrane has reached the steady state.

  14. Criterion and construct validity of the CogState Schizophrenia Battery in Japanese patients with schizophrenia.

    Directory of Open Access Journals (Sweden)

    Taisuke Yoshida

    Full Text Available BACKGROUND: The CogState Schizophrenia Battery (CSB, a computerized cognitive battery, covers all the same cognitive domains as the Measurement and Treatment Research to Improve Cognition in Schizophrenia (MATRICS Consensus Cognitive Battery but is briefer to conduct. The aim of the present study was to evaluate the criterion and construct validity of the Japanese language version of the CSB (CSB-J in Japanese patients with schizophrenia. METHODOLOGY/PRINCIPAL FINDINGS: Forty Japanese patients with schizophrenia and 40 Japanese healthy controls with matching age, gender, and premorbid intelligence quotient were enrolled. The CSB-J and the Brief Assessment of Cognition in Schizophrenia, Japanese-language version (BACS-J were performed once. The structure of the CSB-J was also evaluated by a factor analysis. Similar to the BACS-J, the CSB-J was sensitive to cognitive impairment in Japanese patients with schizophrenia. Furthermore, there was a significant positive correlation between the CSB-J composite score and the BACS-J composite score. A factor analysis showed a three-factor model consisting of memory, speed, and social cognition factors. CONCLUSIONS/SIGNIFICANCE: This study suggests that the CSB-J is a useful and rapid automatically administered computerized battery for assessing broad cognitive domains in Japanese patients with schizophrenia.

  15. A Criterion for the Complete Deposition of Magnetic Beads on the Walls of Microchannels.

    Directory of Open Access Journals (Sweden)

    Jordi Pallares

    Full Text Available This paper analyzes numerical simulations of the trajectories of magnetic beads in a microchannel, with a nearby permanent cubical magnet, under different flow and magnetic conditions. Analytically derived local fluid velocities and local magnetic forces have been used to track the particles. A centered position and a lateral position of the magnet above the microchannel are considered. The computed fractions of deposited particles on the walls are compared successfully with a new theoretically derived criterion that imposes a relation between the sizes of the magnet and the microchannel and the particle Stokes and Alfvén numbers to obtain the complete deposition of the flowing particles on the wall. In the cases in which all the particles, initially distributed uniformly across the section of the microchannel, are deposited on the walls, the simulations predict the accumulation of the major part of particles on the wall closest to the magnet and near the first half of the streamwise length of the magnet.

  16. Fuzzy Wavelet Neural Network Using a Correntropy Criterion for Nonlinear System Identification

    Directory of Open Access Journals (Sweden)

    Leandro L. S. Linhares

    2015-01-01

    Full Text Available Recent researches have demonstrated that the Fuzzy Wavelet Neural Networks (FWNNs are an efficient tool to identify nonlinear systems. In these structures, features related to fuzzy logic, wavelet functions, and neural networks are combined in an architecture similar to the Adaptive Neurofuzzy Inference Systems (ANFIS. In practical applications, the experimental data set used in the identification task often contains unknown noise and outliers, which decrease the FWNN model reliability. In order to reduce the negative effects of these erroneous measurements, this work proposes the direct use of a similarity measure based on information theory in the FWNN learning procedure. The Mean Squared Error (MSE cost function is replaced by the Maximum Correntropy Criterion (MCC in the traditional error backpropagation (BP algorithm. The input-output maps of a real nonlinear system studied in this work are identified from an experimental data set corrupted by different outliers rates and additive white Gaussian noise. The results demonstrate the advantages of the proposed cost function using the MCC as compared to the MSE. This work also investigates the influence of the kernel size on the performance of the MCC in the BP algorithm, since it is the only free parameter of correntropy.

  17. An adapted yield criterion for the evolution of subsequent yield surfaces

    Science.gov (United States)

    Küsters, N.; Brosius, A.

    2017-09-01

    In numerical analysis of sheet metal forming processes, the anisotropic material behaviour is often modelled with isotropic work hardening and an average Lankford coefficient. In contrast, experimental observations show an evolution of the Lankford coefficients, which can be associated with a yield surface change due to kinematic and distortional hardening. Commonly, extensive efforts are carried out to describe these phenomena. In this paper an isotropic material model based on the Yld2000-2d criterion is adapted with an evolving yield exponent in order to change the yield surface shape. The yield exponent is linked to the accumulative plastic strain. This change has the effect of a rotating yield surface normal. As the normal is directly related to the Lankford coefficient, the change can be used to model the evolution of the Lankford coefficient during yielding. The paper will focus on the numerical implementation of the adapted material model for the FE-code LS-Dyna, mpi-version R7.1.2-d. A recently introduced identification scheme [1] is used to obtain the parameters for the evolving yield surface and will be briefly described for the proposed model. The suitability for numerical analysis will be discussed for deep drawing processes in general. Efforts for material characterization and modelling will be compared to other common yield surface descriptions. Besides experimental efforts and achieved accuracy, the potential of flexibility in material models and the risk of ambiguity during identification are of major interest in this paper.

  18. Fast and Scalable Feature Selection for Gene Expression Data Using Hilbert-Schmidt Independence Criterion.

    Science.gov (United States)

    Gangeh, Mehrdad J; Zarkoob, Hadi; Ghodsi, Ali

    2017-01-01

    In computational biology, selecting a small subset of informative genes from microarray data continues to be a challenge due to the presence of thousands of genes. This paper aims at quantifying the dependence between gene expression data and the response variables and to identifying a subset of the most informative genes using a fast and scalable multivariate algorithm. A novel algorithm for feature selection from gene expression data was developed. The algorithm was based on the Hilbert-Schmidt independence criterion (HSIC), and was partly motivated by singular value decomposition (SVD). The algorithm is computationally fast and scalable to large datasets. Moreover, it can be applied to problems with any type of response variables including, biclass, multiclass, and continuous response variables. The performance of the proposed algorithm in terms of accuracy, stability of the selected genes, speed, and scalability was evaluated using both synthetic and real-world datasets. The simulation results demonstrated that the proposed algorithm effectively and efficiently extracted stable genes with high predictive capability, in particular for datasets with multiclass response variables. The proposed method does not require the whole microarray dataset to be stored in memory, and thus can easily be scaled to large datasets. This capability is an important attribute in big data analytics, where data can be large and massively distributed.

  19. Electronic Devices, Methods, and Computer Program Products for Selecting an Antenna Element Based on a Wireless Communication Performance Criterion

    DEFF Research Database (Denmark)

    2014-01-01

    A method of operating an electronic device includes providing a plurality of antenna elements, evaluating a wireless communication performance criterion to obtain a performance evaluation, and assigning a first one of the plurality of antenna elements to a main wireless signal reception and trans...

  20. Further Clarifying Proximal Withdrawal States and the Turnover Criterion Space: Comment on Hom, Mitchell, Lee, and Griffeth (2012)

    Science.gov (United States)

    Maertz, Carl P., Jr.

    2012-01-01

    In "Reviewing Employee Turnover: Focusing on Proximal Withdrawal States and an Expanded Criterion," Hom, Mitchell, Lee, and Griffeth (2012) brought together many of the most important content and process factors in the employee turnover literature. In this paper, I attempt to clarify the true contributions of this framework for the turnover area…