WorldWideScience

Sample records for asynchronous usability testing

  1. Crowdsourcing for Usability Testing

    CERN Document Server

    Liu, Di; Kuipers, Rebecca; Bias, Randolph

    2012-01-01

    While usability evaluation is critical to designing usable websites, traditional usability testing can be both expensive and time consuming. The advent of crowdsourcing platforms such as Amazon Mechanical Turk and CrowdFlower offer an intriguing new avenue for performing remote usability testing with potentially many users, quick turn-around, and significant cost savings. To investigate the potential of such crowdsourced usability testing, we conducted two similar (though not completely parallel) usability studies which evaluated a graduate school's website: one via a traditional usability lab setting, and the other using crowdsourcing. While we find crowdsourcing exhibits some notable limitations in comparison to the traditional lab environment, its applicability and value for usability testing is clearly evidenced. We discuss both methodological differences for crowdsourced usability testing, as well as empirical contrasts to results from more traditional, face-to-face usability testing.

  2. Usability testing for dummies

    CERN Document Server

    CERN. Geneva

    2017-01-01

    Usability testing seems complicated and time-consuming. Is it though? In fact, it is the best way to understand how real users experience your product. In this interactive session, we will do a live usability test and you will get advice on how to conduct your own usability tests.

  3. Cross cultural usability testing

    DEFF Research Database (Denmark)

    Clemmensen, Torkil; Goyal, Shivam

    2005-01-01

    In this paper, we present the results of a pilot study in Denmark of cross cultural effects on Think Aloud usability testing. We provide an overview of previous research on cross cultural usability evaluation with a special focus on the relationship between the evaluator and the test user....... This relation was studied in an experiment with usability testing of a localized clipart application in which eight participants from Denmark and India formed pairs of evaluator-test user. The test users were asked to think aloud and the evaluators' role were to facilitate the test users thinking aloud...... and hereby identify usability problems with the clipart application. Data on the evaluators' and test users' behaviour were recorded and analyzed by coding and summarizing statistics on these behavioural events. The results show that Think Aloud Usability Test of a localized application is most effectively...

  4. Usability testing a practical guide for librarians

    CERN Document Server

    Blakiston, Rebecca

    2014-01-01

    Do you want to improve the usability of your library website, but feel that it is too difficult, time-consuming, or expensive? Usability Testing: A Practical Guide for Librarians will teach you how to make the case for usability testing, define your audience and their goals, select a usability testing method appropriate for your particular context, plan for an in-house usability test, conduct an effective in-house usability test, analyze usability test results, and create and implement a plan for ongoing, systematic usability testing. Step-by-step instructions, along with a myriad of examples,

  5. Integration of MSFC Usability Lab with Usability Testing

    Science.gov (United States)

    Cheng, Yiwei; Richardson, Sally

    2010-01-01

    As part of the Stage Analysis Branch, human factors engineering plays an important role in relating humans to the systems of hardware and structure designs of the new launch vehicle. While many branches are involved in the technical aspects of creating a launch vehicle, human factors connects humans to the scientific systems with the goal of improving operational performance and safety while reducing operational error and damage to the hardware. Human factors engineers use physical and computerized models to visualize possible areas for improvements to ensure human accessibility to components requiring maintenance and that the necessary maintenance activities can be accomplished with minimal risks to human and hardware. Many methods of testing are used to fulfill this goal, such as physical mockups, computerized visualization, and usability testing. In this analysis, a usability test is conducted to test how usable a website is to users who are and are not familiar with it. The testing is performed using participants and Morae software to record and analyze the results. This analysis will be a preliminary test of the usability lab in preparation for use in new spacecraft programs, NASA Enterprise, or other NASA websites. The usability lab project is divided into two parts: integration of the usability lab and a preliminary test of the usability lab.

  6. Library Website Usability Test Project

    KAUST Repository

    Ramli, Rindra M.

    2013-06-01

    This usability testing project was conducted to elicit an understanding of our community use of the library website. The researchers wanted to know how our users are interacting with the library website and the ease of obtaining relevant information from the website. The methodology deployed was computer user testing where participants are made to answer several questions and executing the actions on the library website. Their actions are recorded via Techsmith Camtasia software for later analysis by the researchers.

  7. Usability Testing Of Web Mapping Portals

    Directory of Open Access Journals (Sweden)

    Petr Voldán

    2011-05-01

    Full Text Available This study presents a usability testing as method, which can be used to improve controlling of web map sites. Study refers to the basic principles of this method and describes particular usability tests of mapping sites. In this paper are identified potential usability problems of web sites: Amapy.cz, Google maps and Mapy.cz. The usability testing was focused on problems related with user interfaces, addresses searching and route planning of the map sites.

  8. Usability Study and Usability Tests for CheapSleep Finland Oy Website

    OpenAIRE

    Liu, Jia

    2014-01-01

    Friendly usability of the website is indispensable. Although companies understand the importance of usability, there are only small numbers of companies conducting usability tests on their business websites. CheapSleep Finland Oy requested to test usability of its business website. Thus one objective of this thesis is to carry out usability tests for business website of CheapSleep Finland Oy.

  9. The Evaluator Effect in Usability Tests

    DEFF Research Database (Denmark)

    Jacobsen, Niels Ebbe; Hertzum, Morten; John, Bonnie E.

    1998-01-01

    Usability tests are applied in industry to evaluate systems and in research as a yardstick for other usability evaluation methods. However, one potential threat to the reliability of usability tests has been left unaddressed: the evaluator effect. In this study, four evaluators analyzed four...... videotaped usability test sessions. Only 20% of the 93 unique problems were detected by all four evaluators and 46% were detected by only a single evaluator. Severe problems were detected more often by all four evaluators (41%) and less often by only one evaluator (22%) but a substantial evaluator effect...

  10. Existence test for asynchronous interval iterations

    DEFF Research Database (Denmark)

    Madsen, Kaj; Caprani, O.; Stauning, Ole

    1997-01-01

    as a synchronous (sequential) interval iteration:In each iteration step all components of the iterate are calculatedbased on the previous iterate. In this case it is straight forward to base simple interval existence and non-existencetests on the calculations done in each step of the iteration. The search can also...... be performed as an asynchronous (parallel) iteration: Only a few components are changed in each stepand this calculation is in general based on components from differentprevious iterates. For the asynchronous iteration it turns out thatsimple tests of existence and non-existence can be based...

  11. Merits of usability testing for PACS selection

    NARCIS (Netherlands)

    Jorritsma, Wiard; Cnossen, Fokie; van Ooijen, Peter M. A.

    2014-01-01

    Objectives: To compare the usability of different Picture Archiving and Communication System (PACS) workstations, determine whether a usability test has added value with respect to the traditional way of comparing PACSs based on functional requirements, and to evaluate the appropriateness of a task-

  12. Qualitative Marketing Research Through Usability Testing

    Directory of Open Access Journals (Sweden)

    Orzan Mihai

    2008-04-01

    Full Text Available Usability is an attribute of any good product, just as its functionality. It refers mainly to the utility of a product for its indented users, as well as to its ease of use. And whilst a correct functionality is critical for the commercial success of any product, its value comes through the human needs that it fulfills, which is determined through various marketing research techniques. In parallel, the IT&C community has developed in the last two decades its own type of research, called usability testing, used mainly to evaluate interface ease of use and all usability problems associated with.software products. This article aims at finding the right place for usability testing and usability professionals in the marketing community, as well as drawing a wider picture, from a marketing research perspective, on one of the most popular topics in IT&C community for the benefit of marketing scholars and professionals.

  13. A usability test is not an interview

    DEFF Research Database (Denmark)

    Hertzum, Morten

    2016-01-01

    Usability tests are conducted to gauge users’ experience with a system, preferably before it is released for real use, and thereby find any problems that prevent users from completing their tasks, slow them down, or otherwise degrade their user experience. Such tests are important to successful...... systems development, yet test procedures vary and the quality of test results is sometimes contested. While there is no single accepted procedure for usability specialists to follow when conducting usability tests, these tests normally involve users who think out loud while using a system and an evaluator...... who observes the users’ behavior and listens in on their thoughts. This common core of usability tests is illustrated in Figure 1. The possible variations include, for example, whether the users work individually or in pairs, whether the evaluator is in the room with the user or in an adjoining room...

  14. Situated Usability Testing for Security Systems

    Energy Technology Data Exchange (ETDEWEB)

    Greitzer, Frank L.

    2011-03-02

    While usability testing is well established, assessing the usability of security software, tools, or methods deserves more careful consideration. It has been argued that dealing with security has become too difficult for individuals or organizations to manage effectively or to use conveniently. As difficult as it is for system administrators and developers to deal with, security is even more challenging for casual users. Indeed, it is much too easy for casual/home users to configure the security of their systems in non-optimal ways that leave their systems inadvertently insecure. This is exacerbated by the fact that casual users are focused on matters other than security, and likely would prefer not even to think about security. This brief report argues that when security and/or privacy are part of the equation, traditional methods for usability testing should be re-considered. The purpose of this brief report is to argue for and outline a method associated with a new approach to usability testing for examining usable security issues.

  15. The effects of protoype medium on usability testing.

    Science.gov (United States)

    Boothe, Chase; Strawderman, Lesley; Hosea, Ethan

    2013-11-01

    Inconsistencies among testing methods and results in previous research prompted this study that builds upon a systematic usability testing research framework to better understand how interface medium influences users' abilities to detect usability flaws in applications. Interface medium was tested to identify its effects on users' perceptions of usability and abilities to detect usability problems and severe usability problems. Results indicated that medium has no effect on users' abilities to detect usability problems or perceptions of usability. However, results did indicate an interaction between the medium and the tested application in which users were able to identify significantly more usability problems on a higher fidelity medium using a particular application. Results also indicated that as users' perceptions of an application's usability increases, the users are less able to detect usability problems in that application. Usability testing should begin early in the design process, even if low fidelity mediums will be used.

  16. The impact of usability reports and user test observations on developers understanding of usability data

    DEFF Research Database (Denmark)

    Høegh, Rune Thaarup; Nielsen, Christian Monrad; Pedersen, Michael Bach;

    2006-01-01

    of the system. This article presents results from an exploratory study of 2 ways of providing feedback from a usability evaluation: observation of user tests and reading usability reports. A case study and a field experiment were used to explore how observation and usability reports impact developers......' understanding of usability data. The results indicate that observation of user tests facilitated a rich understanding of usability problems and created empathy with the users and their work. The usability report had a strong impact on the developers' understanding of specific usability problems and supported......A usability evaluation provides a strong and rich basis for understanding and improving the design of user interaction with a software system. Exploiting this evaluation requires feedback that significantly impacts the developers' understanding of usability data about the interaction design...

  17. Usability Testing of User Manuals

    DEFF Research Database (Denmark)

    Møller, Margrethe H.

    2013-01-01

    Many guidelines and several standards exist for the development of good user manuals. But even though technical writers comply with all guidelines, problems will typically arise when users apply the manual in practice. Therefore, it is useful to have real users test the manual before it is publis...... it is published. This article discusses user tests in the form of think-aloud tests, with examples from the research project ”User Manuals for older adults"....

  18. Usability Testing and Analysis Facility (UTAF)

    Science.gov (United States)

    Wong, Douglas T.

    2010-01-01

    This slide presentation reviews the work of the Usability Testing and Analysis Facility (UTAF) at NASA Johnson Space Center. It is one of the Space Human Factors Laboratories in the Habitability and Human Factors Branch (SF3) at NASA Johnson Space Center The primary focus pf the UTAF is to perform Human factors evaluation and usability testing of crew / vehicle interfaces. The presentation reviews the UTAF expertise and capabilities, the processes and methodologies, and the equipment available. It also reviews the programs that it has supported detailing the human engineering activities in support of the design of the Orion space craft, testing of the EVA integrated spacesuit, and work done for the design of the lunar projects of the Constellation Program: Altair, Lunar Electric Rover, and Outposts

  19. Remote Evaluation Of An Interface Usability Using Asynchronous Auto-Logging Methodology

    Directory of Open Access Journals (Sweden)

    Tarus Nicholas Kiprotich

    2015-08-01

    Full Text Available Abstract The need of developing more usable web applications has motivated the development of a number of techniques methods and tools to address web usability issues. In recent years many automated remote usability evaluation methods have been employed. Despite the advantages offered by these methods usability evaluation is still a difficult and a time consuming task partly due to complexity of the tools used and partly due to expertise required. Analysing data obtained from web server logs can reveal usage pattern of users. This gives a highly improved understanding of users behaviour. This information can then be utilized in improving a web e application way which usability interfa evaluation of a web application can be approached. State transition network STN was preferred in this work. This paper presents a model for automated remote usability evaluation which automatically generates specific usability information of a remote web application.

  20. The effectiveness of novice users in usability testing

    OpenAIRE

    Gerardo, John Lester Sarmiento

    2007-01-01

    Current research is fine-tuning the usability evaluation methods in order to aid current and future usability practitioners. Some of the main research topics are sample sizes and appropriate statistical methods for analysing usability test data. However, few studies have focused on participants with different experience levels on test samples. This thesis aims to fill this gap and add knowledge to the ongoing research on users with different experience levels in usability testing. Th...

  1. Development and testing of new upper-limb prosthetic devices: Research designs for usability testing

    OpenAIRE

    Linda Resnik, PT, PhD, OCS

    2011-01-01

    The purposes of this article are to describe usability testing and introduce designs and methods of usability testing research as it relates to upper-limb prosthetics. This article defines usability, describes usability research, discusses research approaches to and designs for usability testing, and highlights a variety of methodological considerations, including sampling, sample size requirements, and usability metrics. Usability testing is compared with other types of study designs used in...

  2. Development and testing of new upper-limb prosthetic devices: Research designs for usability testing

    Directory of Open Access Journals (Sweden)

    Linda Resnik, PT, PhD, OCS

    2011-07-01

    Full Text Available The purposes of this article are to describe usability testing and introduce designs and methods of usability testing research as it relates to upper-limb prosthetics. This article defines usability, describes usability research, discusses research approaches to and designs for usability testing, and highlights a variety of methodological considerations, including sampling, sample size requirements, and usability metrics. Usability testing is compared with other types of study designs used in prosthetic research.

  3. Templates for Cross-Cultural and Culturally Specific Usability Testing

    DEFF Research Database (Denmark)

    Clemmensen, Torkil

    2011-01-01

    The cultural diversity of users of technology challenges our methods for usability testing. This article suggests templates for cross-culturally and culturally specific usability testing, based on studies of usability testing in companies in Mumbai, Beijing, and Copenhagen. Study 1 was a cross...... tests. The result was the construction of templates for usability testing. The culturally specific templates were in Mumbai “user-centered evaluation,” Copenhagen “client-centered evaluation,” and Beijing “evaluator-centered evaluation.” The findings are compared with related research......-cultural field study of think-aloud testing done by usability vendor companies in the three countries. The result was a grounded theory of cultural variations in the production of a usability problem list. Study 2 was a follow-up, ethnographic interview study of how the companies typically perform usability...

  4. Building a Remote Usability Testing Body of Knowledge (RUTBOK)

    DEFF Research Database (Denmark)

    Lizano, Fulvio; Stage, Jan

    2012-01-01

    Remote Usability Testing (RUT) is an alternative method of usability evaluations. The main aim of RUT is the reduction of costs in the usability evaluation process. Since middle of the 90s RUT, has emerged as a technique which seems as is gaining maturity across the time. In general any discipline...

  5. New Options for Usability Testing Projects in Business Communication Courses

    Science.gov (United States)

    Jameson, Daphne A.

    2013-01-01

    The increasing availability of recording technologies makes it easier to include usability testing projects in business communication courses. Usability testing is a method of discovering whether people can navigate, read, and understand a print or electronic communication well enough to achieve a particular purpose in a reasonable time frame.…

  6. Asynchronous P300-based brain-computer interface to control a virtual environment: initial tests on end users.

    Science.gov (United States)

    Aloise, Fabio; Schettini, Francesca; Aricò, Pietro; Salinari, Serenella; Guger, Christoph; Rinsma, Johanna; Aiello, Marco; Mattia, Donatella; Cincotti, Febo

    2011-10-01

    Motor disability and/or ageing can prevent individuals from fully enjoying home facilities, thus worsening their quality of life. Advances in the field of accessible user interfaces for domotic appliances can represent a valuable way to improve the independence of these persons. An asynchronous P300-based Brain-Computer Interface (BCI) system was recently validated with the participation of healthy young volunteers for environmental control. In this study, the asynchronous P300-based BCI for the interaction with a virtual home environment was tested with the participation of potential end-users (clients of a Frisian home care organization) with limited autonomy due to ageing and/or motor disabilities. System testing revealed that the minimum number of stimulation sequences needed to achieve correct classification had a higher intra-subject variability in potential end-users with respect to what was previously observed in young controls. Here we show that the asynchronous modality performed significantly better as compared to the synchronous mode in continuously adapting its speed to the users' state. Furthermore, the asynchronous system modality confirmed its reliability in avoiding misclassifications and false positives, as previously shown in young healthy subjects. The asynchronous modality may contribute to filling the usability gap between BCI systems and traditional input devices, representing an important step towards their use in the activities of daily living.

  7. Usability testing of Fiskars International Website

    OpenAIRE

    Krylova, Lilya

    2015-01-01

    This Bachelor thesis relates to Fiskars Brand website. Fiskars Corporation is the leading supplier of branded consumer products for garden, home and outdoor tools as well as some other equipment throughout the world. The main objective of the thesis was to explore the usability and to evaluate user interface design of a new Fiskars International Website to identify potential weaknesses as well as to lay emphasis on strong sides of the website. The research may also point on possible usab...

  8. Ethical Concerns in Usability Testing Involving Older Adults

    DEFF Research Database (Denmark)

    Møller, Margrethe Hansen

    Based on experience from the research project “User Manuals for Older Adults”, this paper discusses whether there are special ethical concerns with older adults as test persons in a usability test involving the think-aloud method. In this context, older adults are defined as individuals with normal...... cognitive and physical problems of ageing. The paper concludes that usability testing is necessary as a part of the design cycle, but that special care can be taken to ensure that test persons do not feel disempowered during the test....

  9. Designing an Affordable Usability Test for E-Learning Modules

    Science.gov (United States)

    O'Bryan, Corliss A.; Johnson, Donald M.; Shores-Ellis, Katrina D.; Crandall, Philip G.; Marcy, John A.; Seideman, Steve C.; Ricke, Steven C.

    2010-01-01

    This article provides background and an introduction to a user-centered design and usability test in an inexpensive format that allows content experts who are novices in e-learning development to perform testing on newly developed technical training modules prior to their release. The use of a small number of test participants, avoidance of…

  10. Designing Websites for ESL Learners: A Usability Testing Study

    Science.gov (United States)

    Liu, Min; Traphagan, Tomoko; Huh, Jin; Koh, Young Ihn; Choi, Gilok; McGregor, Allison

    2008-01-01

    The purpose of this paper is to report on a usability study for ESL websites conducted to gain insights from learners of English as a second language (ESL) as they interacted with specific sites. Five carefully selected ESL sites were tested by 10 different users generating a total of fifty testing sessions. Two major research questions guided the…

  11. Considerations and Methods for Usability Testing with School Children

    DEFF Research Database (Denmark)

    Andersen, Malene Hjortboe; Khalid, Md. Saifuddin; Brooks, Eva Irene

    2017-01-01

    of these methods is that they are designed for adults and are not necessarily appropriate to investigations including children. The guiding questions for this systematic literature review are (1) the motivation for conducting usability tests with children, and (2) the kind of methodological, practical, and ethical...... and then synthesized by applying the constant comparative method. The synthesis of the literature review is based on the identified thematic priorities, which are categorized as follows: 1) the motivation for involving children as test persons in design processes, 2) definitions of usability, 3) practical...

  12. Realization of station for testing asynchronous three-phase motors

    Science.gov (United States)

    Wróbel, A.; Surma, W.

    2016-08-01

    Nowadays, you cannot imagine the construction and operation of machines without the use of electric motors [13-15]. The proposed position is designed to allow testing of asynchronous three-phase motors. The position consists of a tested engine and the engine running as a load, both engines combined with a mechanical clutch [2]. The value of the load is recorded by measuring shaft created with Strain Gauge Bridge. This concept will allow to study the basic parameters of the engines, visualization motor parameters both vector and scalar controlled, during varying load drive system. In addition, registration during the variable physical parameters of the working electric motor, controlled by a frequency converter or controlled by a contactor will be possible. Position is designed as a teaching and research position to characterize the engines. It will be also possible selection of inverter parameters.

  13. User-Centered Design and Usability Testing of a Web Site: An Illustrative Case Study.

    Science.gov (United States)

    Corry, Michael D.; Frick, Theodore W.; Hansen, Lisa

    1997-01-01

    Presents an overview of user-centered design and usability testing. Describes a Web site evaluation project at a university, the iterative process of rapid prototyping and usability testing, and how the findings helped to improve the design. Discusses recommendations for university Web site design and reflects on problems faced in usability…

  14. The Virtual Anatomy Laboratory: Usability Testing to Improve an Online Learning Resource for Anatomy Education

    Science.gov (United States)

    Doubleday, Eldridge G.; O'Loughlin, Valerie D.; Doubleday, Alison F.

    2011-01-01

    An increasing number of instructors are seeking to provide students with online anatomy resources. Many researchers have attempted to identify associations between resource use and student learning but few studies discuss the importance of usability testing in resource design and modification. Usability testing provides information about ease of…

  15. Usability Testing for Developing Effective Interactive Multimedia Software: Concepts, Dimensions, and Procedures

    Directory of Open Access Journals (Sweden)

    Sung Heum Lee

    1999-04-01

    Full Text Available Usability testing is a dynamic process that can be used throughout the process of developing interactive multimedia software. The purpose of usability testing is to find problems and make recommendations to improve the utility of a product during its design and development. For developing effective interactive multimedia software, dimensions of usability testing were classified into the general categories of: learnability; performance effectiveness; flexibility; error tolerance and system integrity; and user satisfaction. In the process of usability testing, evaluation experts consider the nature of users and tasks, tradeoffs supported by the iterative design paradigm, and real world constraints to effectively evaluate and improve interactive multimedia software. Different methods address different purposes and involve a combination of user and usability testing, however, usability practitioners follow the seven general procedures of usability testing for effective multimedia development. As the knowledge about usability testing grows, evaluation experts will be able to choose more effective and efficient methods and techniques that are appropriate to their goals.

  16. Let Your Users Do the Testing

    DEFF Research Database (Denmark)

    Bruun, Anders; Gull, Peter; Hofmeister, Lene

    2009-01-01

    Remote asynchronous usability testing is characterized by both a spatial and temporal separation of users and evaluators. This has the potential both to reduce practical problems with securing user attendance and to allow direct involvement of users in usability testing. In this paper, we report...... from an empirical study where we systematically compared three methods for remote asynchronous usability testing: user-reported critical incidents, forum-based online reporting and discussion, and diary-based longitudinal user reporting. In addition, conventional laboratory-based think-aloud testing....... This makes remote asynchronous methods an appealing possibility for usability testing in many software projects....

  17. Sample size in usability studies

    NARCIS (Netherlands)

    Schmettow, Martin

    2012-01-01

    Usability studies are important for developing usable, enjoyable products, identifying design flaws (usability problems) likely to compromise the user experience. Usability testing is recommended for improving interactive design, but discovery of usability problems depends on the number of users tes

  18. The Influence of Product Aesthetics and User State in Usability Testing

    Science.gov (United States)

    Sauer, Juergen; Sonderegger, Andreas

    2011-01-01

    An empirical study examined the effects of two influencing factors in usability tests on user performance and usability ratings. Product aesthetics (high vs. low) as the main independent factor and prior usage event (positive vs. negative) as a subsidiary independent factor were varied in a between-participants design. 60 participants took part in…

  19. Low-Cost Rapid Usability Testing: Its Application in Both Product Development and System Implementation.

    Science.gov (United States)

    Kushniruk, Andre; Borycki, Elizabeth

    2017-01-01

    In recent years there has been considerable discussion around the need for certification and regulation of healthcare information technology (IT). In particular, the usability of the products being developed needs to be evaluated. This has included the application of standards designed to ensure the process of system development is user-centered and takes usability into consideration while a product is being developed. In addition to this, in healthcare, organizations in the United States and Europe have also addressed the need and requirement for product certification. However, despite these efforts there are continued reports of unusable and unsafe implementations. In this paper we discuss the need to not only include (and require) usability testing in the one-time development process of health IT products (such as EHRs), but we also argue for the need to additionally develop specific usability standards and requirements for usability testing during the implementation of vendor products (i.e. post product development) in healthcare settings. It is further argued that health IT products that may have been certified regarding their development process will still require application of usability testing in the process of implementing them in real hospital settings in order to ensure usability and safety. This is needed in order to ensure that the final result of both product development and implementation processes take into account and apply the latest usability principles and methods.

  20. Digital Resource Exchange About Music (DREAM): Phase 2 Usability Testing

    Science.gov (United States)

    Upitis, Rena; Boese, Karen; Abrami, Philip C.; Anwar, Zaeem

    2015-01-01

    The Digital Resource Exchange About Music (DREAM) is a virtual space for exchanging information about digital learning tools. The purpose of the present study was to determine how users responded to DREAM in the first four months after its public release. This study is the second phase of usability research on DREAM, and was conducted to guide…

  1. Comparison of CTA and Textual Feedback in Usability Testing for Malaysian Users

    DEFF Research Database (Denmark)

    Sivaji, Ashok; Clemmensen, Torkil; Nielsen, Søren Feodor

    Usability moderators found that the concurrent think-aloud (CTA) method has some cultural limitation that impacts usability testing with Malaysian users. This gives rise to proposing a new method called textual feedback. The research question is to determine whether there are any differences...... in terms of usability defects found by employing the new method. Due to the high power distance, it is hypothesized that the CTA method may not be sufficient and hence a textual feedback method is recommended instead. Hence, the objective of this study is to determine if there are any differences...... in usability defects from the concurrent think-aloud (CTA) method (Condition 2) and textual feedback method (Condition 1) within the same group of Malaysian users. A pair-wise t-test was used, whereby users were subjected to performing usability task using both methods. Results reveal that we can reject...

  2. A systematic review of usability test metrics for mobile video streaming apps

    Science.gov (United States)

    Hussain, Azham; Mkpojiogu, Emmanuel O. C.

    2016-08-01

    This paper presents the results of a systematic review regarding the usability test metrics for mobile video streaming apps. In the study, 238 studies were found, but only 51 relevant papers were eventually selected for the review. The study reveals that time taken for video streaming and the video quality were the two most popular metrics used in the usability tests for mobile video streaming apps. Besides, most of the studies concentrated on the usability of mobile TV as users are switching from traditional TV to mobile TV.

  3. Usability testing: a review of some methodological and technical aspects of the method

    CERN Document Server

    Bastien, J M Christian

    2010-01-01

    The aim of this paper is to review some work conducted in the field of user testing that aims at specifying or clarifying the test procedures and at defining and developing tools to help conduct user tests. The topics that have been selected were considered relevant for evaluating applications in the field of medical and health care informatics. These topics are: the number of participants that should take part in a user test, the test procedure, remote usability evaluation, usability testing tools, and evaluating mobile applications.

  4. USABILITY TESTING OF VIRTUAL KEYBOARD IN TOUCH SCREEN WITH QUESTIONNAIRE METHOD

    Directory of Open Access Journals (Sweden)

    Harijanto Pangetsu

    2014-05-01

    Full Text Available A system consists of input, process, and output. User interface is a place for users to interact in the system where one of the functions is as input facility of the system. One of the input tools is keyboard. With the development of touchscreen, then virtual keyboard is required. A good interface must be able to be used easily especially for novice users. The usability testing is required to know the usability level of the interface. A good usability has characteristics of effective to use (effectiveness, efficient to use (efficiency, safe to use (safety, having good utility (utility, easy to learn (learnability and easy to remember how to use (memorability. Usability testing is an evaluation approach involving users. With usability testing, it is expected that it can give positive inputs in designing an interface especially virtual keyboard interface mainly with the characteristics of easy to learn (learnability, and easy to remember how to use (memorability so that the resulted design can have good usability level

  5. Comparison of Think-Aloud and Constructive Interaction in Usability Testing with Children

    DEFF Research Database (Denmark)

    Als, Benedikte Skibsted; Jensen, Janne Jul; Skov, Mikael B.

    2005-01-01

    Constructive interaction provides natural thinking-aloud as test subjects collaborate to solve tasks. Since children may face difficulties in following instructions for a standard think-aloud test, constructive interaction has been suggested as evaluation method when usability testing with childr....... However, the relationship between think-aloud and constructive interaction is still poorly understood. We present an experiment that compares think-aloud and constructive interaction in usability testing. The experiment involves 60 children with three setups where children apply think......-aloud, and constructive interaction in acquainted and non-acquainted pairs. Our results show that the pairing of children had impact on identification of usability problems as acquainted dyads identified more problems both in total and of the most severe than non-acquainted dyads and individual testers. Finally...

  6. An investigation of the efficacy of collaborative virtual reality systems for moderated remote usability testing.

    Science.gov (United States)

    Chalil Madathil, Kapil; Greenstein, Joel S

    2017-02-27

    Collaborative virtual reality-based systems have integrated high fidelity voice-based communication, immersive audio and screen-sharing tools into virtual environments. Such three-dimensional collaborative virtual environments can mirror the collaboration among usability test participants and facilitators when they are physically collocated, potentially enabling moderated usability tests to be conducted effectively when the facilitator and participant are located in different places. We developed a virtual collaborative three-dimensional remote moderated usability testing laboratory and employed it in a controlled study to evaluate the effectiveness of moderated usability testing in a collaborative virtual reality-based environment with two other moderated usability testing methods: the traditional lab approach and Cisco WebEx, a web-based conferencing and screen sharing approach. Using a mixed methods experimental design, 36 test participants and 12 test facilitators were asked to complete representative tasks on a simulated online shopping website. The dependent variables included the time taken to complete the tasks; the usability defects identified and their severity; and the subjective ratings on the workload index, presence and satisfaction questionnaires. Remote moderated usability testing methodology using a collaborative virtual reality system performed similarly in terms of the total number of defects identified, the number of high severity defects identified and the time taken to complete the tasks with the other two methodologies. The overall workload experienced by the test participants and facilitators was the least with the traditional lab condition. No significant differences were identified for the workload experienced with the virtual reality and the WebEx conditions. However, test participants experienced greater involvement and a more immersive experience in the virtual environment than in the WebEx condition. The ratings for the virtual

  7. The influence of socio-cultural background and product value in usability testing.

    Science.gov (United States)

    Sonderegger, Andreas; Sauer, Juergen

    2013-05-01

    This article examines the influence of socio-cultural background and product value on different outcomes of usability tests. A study was conducted in two different socio-cultural regions, Switzerland and East Germany, which differed in a number of aspects (e.g. economic power, price sensitivity and culture). Product value (high vs. low) was varied by manipulating the price of the product. Sixty-four test participants were asked to carry out five typical user tasks in the context of coffee machine usage, measuring performance, perceived usability, and emotion. The results showed that in Switzerland, high-value products were rated higher in usability than low-value products whereas in East Germany, high-value products were evaluated lower in usability. A similar interaction effect of socio-cultural background and product value was observed for user emotion. Implications are that the outcomes of usability tests do not allow for a simple transfer across cultures and that the mediating influence of perceived product value needs to be taken into consideration.

  8. Fuzzy delay model based fault simulator for crosstalk delay fault test generation in asynchronous sequential circuits

    Indian Academy of Sciences (India)

    S Jayanthy; M C Bhuvaneswari

    2015-02-01

    In this paper, a fuzzy delay model based crosstalk delay fault simulator is proposed. As design trends move towards nanometer technologies, more number of new parameters affects the delay of the component. Fuzzy delay models are ideal for modelling the uncertainty found in the design and manufacturing steps. The fault simulator based on fuzzy delay detects unstable states, oscillations and non-confluence of settling states in asynchronous sequential circuits. The fuzzy delay model based fault simulator is used to validate the test patterns produced by Elitist Non-dominated sorting Genetic Algorithm (ENGA) based test generator, for detecting crosstalk delay faults in asynchronous sequential circuits. The multi-objective genetic algorithm, ENGA targets two objectives of maximizing fault coverage and minimizing number of transitions. Experimental results are tabulated for SIS benchmark circuits for three gate delay models, namely unit delay model, rise/fall delay model and fuzzy delay model. Experimental results indicate that test validation using fuzzy delay model is more accurate than unit delay model and rise/fall delay model.

  9. Low Cost vs. High-End Eye Tracking for Usability Testing

    DEFF Research Database (Denmark)

    Johansen, Sune Alstrup; San Agustin, Javier; Jensen, Henrik Tomra Skovsgaard Hegner

    2011-01-01

    Accuracy of an open source remote eye tracking system and a state-of-the-art commercial eye tracker was measured 4 times during a usability test. Results from 9 participants showed both devices to be fairly stable over time, but the commercial tracker was more accurate with a mean error of 31...... pixels against 59 pixels using the low cost system. This suggests that low cost eye tracking can become a viable alternative, when usability studies need not to distinguish between, for instance, particular words or menu items that participants are looking at, but only between larger areas...

  10. Usability testing by older adults of a computer-mediated health communication program.

    Science.gov (United States)

    Lin, Carolyn A; Neafsey, Patricia J; Strickler, Zoe

    2009-03-01

    Failure to adhere to an antihypertensive regimen and interactions between antihypertensives and other medicines represent serious health threats to older adults. This study tested the usability of a touch-screen-enabled personal education program (PEP). Findings showed that older adults rated the PEP system usability, system usefulness, and system-use satisfaction at a moderately high level for prototype-1 and at an exceptionally high level for prototype-2. A 201.91% reduction in interface errors and a 31.08% decrease in interface time also were found between the two trials. This participatory usability design was highly successful in tailoring its program interface design to accommodate older users to enhance their health communication and technology use efficacy.

  11. Exploring two methods of usability testing: concurrent versus retrospective think-aloud protocols

    NARCIS (Netherlands)

    Haak, van den Maaike J.; Jong, de Menno D.T.

    2003-01-01

    Think-aloud protocols are commonly used for the usability testing of instructional documents, Web sites and interfaces. This paper addresses the benefits and drawbacks of two think-aloud variations: the traditional concurrent think-aloud method and the less familiar retrospective think-aloud protoco

  12. Advanced practice registered nurse usability testing of a tailored computer-mediated health communication program.

    Science.gov (United States)

    Lin, Carolyn A; Neafsey, Patricia J; Anderson, Elizabeth

    2010-01-01

    This study tested the usability of a touch-screen-enabled Personal Education Program with advanced practice RNs. The Personal Education Program is designed to enhance medication adherence and reduce adverse self-medication behaviors in older adults with hypertension. An iterative research process was used, which involved the use of (1) pretrial focus groups to guide the design of system information architecture, (2) two different cycles of think-aloud trials to test the software interface, and (3) post-trial focus groups to gather feedback on the think-aloud studies. Results from this iterative usability-testing process were used to systematically modify and improve the three Personal Education Program prototype versions-the pilot, prototype 1, and prototype 2. Findings contrasting the two separate think-aloud trials showed that APRN users rated the Personal Education Program system usability, system information, and system-use satisfaction at a moderately high level between trials. In addition, errors using the interface were reduced by 76%, and the interface time was reduced by 18.5% between the two trials. The usability-testing processes used in this study ensured an interface design adapted to APRNs' needs and preferences to allow them to effectively use the computer-mediated health-communication technology in a clinical setting.

  13. Usability Testing, User-Centered Design, and LibGuides Subject Guides: A Case Study

    Science.gov (United States)

    Sonsteby, Alec; DeJonghe, Jennifer

    2013-01-01

    Usability testing has become a routine way for many libraries to ensure that their Web presence is user-friendly and accessible. At the same time, popular subject guide creation systems, such as LibGuides, decentralize Web content creation and put authorship into the hands of librarians who may not be trained in user-centered design principles. At…

  14. A generic usability test environment for webbased services

    NARCIS (Netherlands)

    Lindenberg, J.; Neerincx, M.A.

    1999-01-01

    Er is een softwaretool ontwikkeld voor het uitvoeren van gebruikerstesten van Internetdiensten. De tool kan worden gebruikt om een test op te zetten, uit te voeren en alle gegenereerde data vast te leggen.

  15. Human Factors for Nursing: From In-Situ Testing to Mobile Usability Engineering.

    Science.gov (United States)

    Kushniruk, Andre W; Borycki, Elizabeth M; Solvoll, Terje; Hullin, Carola

    2016-01-01

    The tutorial goal is to familiarize participants with human aspects of health informatics and human-centered approaches to the design, evaluation and deployment of both usable and safe healthcare information systems. The focus will be on demonstrating and teaching practical and low-cost methods for evaluating mobile applications in nursing. Basic background to testing methods will be provided, followed by live demonstration of the methods. Then the audience will break into small groups to explore the application of the methods to applications of interest (there will be a number of possible applications that will be available for applications in areas such as electronic health records and decision support, however, if the groups have applications of specific interest to them that will be possible). The challenges of conducting usability testing, and in particular mobile usability testing will be discussed along with practical solutions. The target audience includes practicing nurses and nurse researchers, nursing informatics specialists, nursing students, nursing managers and health informatics professionals interested in improving the usability and safety of healthcare applications.

  16. From Usability Testing to Clinical Simulations: Bringing Context into the Design and Evaluation of Usable and Safe Health Information Technologies

    DEFF Research Database (Denmark)

    Kushniruk, Andre; Nøhr, Christian; Jensen, Sanne

    2013-01-01

    Objectives: The objective of this paper is to explore human factors approaches to understanding the use of health information technology (HIT) by extending usability engineering approaches to include analysis of the impact of clinical context through use of clinical simulations. Methods: Methods...

  17. Usability testing of a monitoring and feedback tool to stimulate physical activity

    Directory of Open Access Journals (Sweden)

    van der Weegen S

    2014-03-01

    Full Text Available Sanne van der Weegen,1 Renée Verwey,1,2 Huibert J Tange,3 Marieke D Spreeuwenberg,1 Luc P de Witte1,2 1Department of Health Services Research, CAPHRI School for Public Health and Primary Care, Faculty of Health Medicine and Life Sciences, Maastricht University, the Netherlands; 2Research Centre Technology in Care, Zuyd University of Applied Sciences, Heerlen, the Netherlands; 3Department of General Practice, CAPHRI School for Public Health and Primary Care, Faculty of Health Medicine and Life Sciences, Maastricht University, the Netherlands Introduction: A monitoring and feedback tool to stimulate physical activity, consisting of an activity sensor, smartphone application (app, and website for patients and their practice nurses, has been developed: the 'It's LiFe!' tool. In this study the usability of the tool was evaluated by technology experts and end users (people with chronic obstructive pulmonary disease or type 2 diabetes, with ages from 40–70 years, to improve the user interfaces and content of the tool. Patients and methods: The study had four phases: 1 a heuristic evaluation with six technology experts; 2 a usability test in a laboratory by five patients; 3 a pilot in real life wherein 20 patients used the tool for 3 months; and 4 a final lab test by five patients. In both lab tests (phases 2 and 4 qualitative data were collected through a thinking-aloud procedure and video recordings, and quantitative data through questions about task complexity, text comprehensiveness, and readability. In addition, the post-study system usability questionnaire (PSSUQ was completed for the app and the website. In the pilot test (phase 3, all patients were interviewed three times and the Software Usability Measurement Inventory (SUMI was completed. Results: After each phase, improvements were made, mainly to the layout and text. The main improvement was a refresh button for active data synchronization between activity sensor, app, and server

  18. Usability Testing as a Method to Refine a Health Sciences Library Website.

    Science.gov (United States)

    Denton, Andrea H; Moody, David A; Bennett, Jason C

    2016-01-01

    User testing, a method of assessing website usability, can be a cost-effective and easily administered process to collect information about a website's effectiveness. A user experience (UX) team at an academic health sciences library has employed user testing for over three years to help refine the library's home page. Test methodology used in-person testers using the "think aloud" method to complete tasks on the home page. Review of test results revealed problem areas of the design and redesign; further testing was effective in refining the page. User testing has proved to be a valuable method to engage users and provide feedback to continually improve the library's home page.

  19. Usability of Operational Performance Support Tools - Findings from Sea Test II

    Science.gov (United States)

    Byrne, Vicky; Litaker, Harry; McGuire, Kerry

    2014-01-01

    Sea Test II, aka NASA Extreme Environment Mission Operations 17(NEEMO 17) took place in the Florida Aquarius undersea habitat. This confined underwater environment provides a excellent analog for space habitation providing similarities to space habitation such as hostile environment, difficult logistics, autonomous operations, and remote communications. This study collected subjective feedback on the usability of two performance support tools during the Sea Test II mission, Sept 10-14, 2013; Google Glass and iPAD. The two main objectives: - Assess the overall functionality and usability of each performance support tool in a mission analog environment. - Assess the advantages and disadvantages of each tool when performing operational procedures and Just-In-Time-Training (JITT).

  20. Modeling a Library Web Site Redesign Process: Developing a User-Centered Web Site Through Usability Testing

    Directory of Open Access Journals (Sweden)

    Danielle A. Becker

    2013-03-01

    Full Text Available This article presents a model for creating a strong, user-centered web presence by pairing usability testing and the design process. Four rounds of usability testing were conducted throughout the process of building a new academic library web site. Participants were asked to perform tasks using a talk-aloud protocol. Tasks were based on guiding principles of web usability that served as a framework for the new site. Results from this study show that testing throughout the design process is an effective way to build a web site that not only reflects user needs and preferences, but can be easily changed as new resources and technologies emerge.

  1. Usability Test Results for a Discovery Tool in an Academic Library

    Directory of Open Access Journals (Sweden)

    Jody Condit Fagan

    2008-03-01

    Full Text Available Discovery tools are emerging in libraries. These tools offer library patrons the ability to concurrently search the library catalog and journal articles. While vendors rush to provide feature-rich interfaces and access to as much content as possible, librarians wonder about the usefulness of these tools to library patrons. In order to learn about both the utility and usability of EBSCO Discovery Service, James Madison University conducted a usability test with eight students and two faculty members. The test consisted of nine tasks focused on common patron requests or related to the utility of specific discovery tool features. Software recorded participants’ actions and time on task, human observers judged the success of each task, and a post-survey questionnaire gathered qualitative feedback and comments from the participants.  Overall, participants were successful at most tasks, but specific usability problems suggested some interface changes for both EBSCO Discovery Service and JMU’s customizations of the tool.  The study also raised several questions for libraries above and beyond any specific discovery tool interface, including the scope and purpose of a discovery tool versus other library systems, working with the large result sets made possible by discovery tools, and navigation between the tool and other library services and resources.  This article will be of interest to those who are investigating discovery tools, selecting products, integrating discovery tools into a library web presence, or performing evaluations of similar systems.

  2. The influence of laboratory set-up in usability tests: effects on user performance, subjective ratings and physiological measures.

    Science.gov (United States)

    Sonderegger, Andreas; Sauer, Juergen

    2009-11-01

    This article examines the influences of situational factors on user behaviour in usability tests. Sixty participants carried out two tasks on a computer-simulated prototype of a mobile phone. Employing a 3 x 2 mixed experimental design, laboratory set-up was varied as a between-subjects variable (presence of facilitator and two non-interactive observers, presence of facilitator or no person present) while task difficulty was manipulated as a within-subjects variable (low vs. high). Performance data, subjective measures and physiological parameters (e.g. heart rate variability) were taken. The results showed that the presence of non-interactive observers during a usability test led to a physiological stress response, decreased performance on some measures and affected the emotional state of test participants. The presence of a facilitator (i.e. a participating observer) also influenced the emotional state of the test participant. Practitioners involved in usability testing need to be aware of undue influences of observers, in particular, if the observers are non-interactive. The findings presented in this paper have implications for the practice of usability testing. They indicated a considerable influence of observers on test participants (physiology and emotions) and on the outcomes of usability tests (performance measures). This should be considered when selecting the set-up of a usability testing procedure.

  3. The Influence of Socio-Cultural Background and Product Value in Usability Testing

    OpenAIRE

    Sonderegger, Andreas; Sauer, Juergen

    2013-01-01

    This article examines the influence of socio-cultural background and product value on different outcomes of usability tests. A study was conducted in two different socio-cultural regions, Switzerland and East Germany, which differed in a number of aspects (e.g. economic power, price sensitivity and culture). Product value (high vs. low) was varied by manipulating the price of the product. Sixty-four test participants were asked to carry out five typical user tasks in the context of coffee mac...

  4. Fine-tuning Central Banks Web Communications: Usability Tests & Content Management

    Directory of Open Access Journals (Sweden)

    Christian A. Bolu

    2012-10-01

    Full Text Available Business processes especially in the Central Banks are more fully integrated and streamlined than ever before. Also, realistic system landscapes often consist of many systems. Disconnected silos of unstructured information continue to pile up for each organizational function and different interfaces are often implemented using the technology that is considered to be ideal for the respective interface. There appears to be lack of Enterprise Content Management strategy thus leading to significant business challenges such as untrustworthy business information due to inaccurate, outdated, conflicting information, longer financial cycles and generally inefficient processes, system performance degradations and poor data organization, inconsistent, confusing user interface as well as frequent context switching.There is therefore the need for an effective enterprise content management strategy. Web content management systems are often used for storing, controlling, versioning, and publishing industry-specific documentations. Usability testing of web sites is an essential element of quality assurance and a true test of how people actually use Central Banks’ web site. It is a test of whether outsiders can successfully use the Banks’ Web site. Although formal usability tests are expensive, time-consuming and often prohibitive, periodic user testing is an important element in developing and maintaining a reader-friendly Website. Usability should emphasise clarity of communication, accessibility, consistency, navigation design, maintenance and good visual presentation.A solution to corporate intranet/internet chaos are Enterprise Portals. An enterprise portal is the gateway to the end user. It offers a central point of access to information, applications and services in an enterprise. It is a one-stop shopping for knowledge workers; the portal is both a gateway to and a destination on the enterprise network that provides transparent, tailored access to

  5. Usability Testing of a Large, Multidisciplinary Library Database: Basic Search and Visual Search

    Directory of Open Access Journals (Sweden)

    Jody Condit Fagan

    2006-09-01

    Full Text Available Visual search interfaces have been shown by researchers to assist users with information search and retrieval. Recently, several major library vendors have added visual search interfaces or functions to their products. For public service librarians, perhaps the most critical area of interest is the extent to which visual search interfaces and text-based search interfaces support research. This study presents the results of eight full-scale usability tests of both the EBSCOhost Basic Search and Visual Search in the context of a large liberal arts university.

  6. Usability Testing of a Large, Multidisciplinary Library Database: Basic Search and Visual Search

    OpenAIRE

    Fagan, Jody Condit

    2006-01-01

    Visual search interfaces have been shown by researchers to assist users with information search and retrieval. Recently, several major library vendors have added visual search interfaces or functions to their products. For public service librarians, perhaps the most critical area of interest is the extent to which visual search interfaces and text-based search interfaces support research. This study presents the results of eight full-scale usability tests of both the EBSCOhost Basic Search an...

  7. Usability Testing of a Multimedia e-Learning Resource for Electrolyte and Acid-Base Disorders

    Science.gov (United States)

    Davids, Mogamat Razeen; Chikte, Usuf; Grimmer-Somers, Karen; Halperin, Mitchell L.

    2014-01-01

    The usability of computer interfaces may have a major influence on learning. Design approaches that optimize usability are commonplace in the software development industry but are seldom used in the development of e-learning resources, especially in medical education. We conducted a usability evaluation of a multimedia resource for teaching…

  8. Validating WCAG versions 1.0 and 2.0 through usability testing with disabled users

    DEFF Research Database (Denmark)

    Rømen, Dagfinn; Svanæs, Dag

    2012-01-01

    accessibility evaluations and guidelines in many countries. WCAG version 2.0 was released in 2008. This paper reports on a study that empirically validated the usefulness of using WCAG as a heuristic for website accessibility. Through controlled usability tests of two websites with disabled users (N = 7......) and a control group (N = 6), it was found that only 27% of the identified website accessibility problems could have been identified through the use of WCAG 1.0. A similar analysis of conformance to WCAG 2.0 showed a marginal 5% improvement concerning identified website accessibility problems. Compensating...... for the low number of test subjects with confidence tests gave results that were still low (42% for WCAG 1.0 and 49% for WCAG 2.0, with 95% confidence). It is concluded from this that the application of WAI accessibility guidelines is not sufficient to guarantee website accessibility. It is recommended...

  9. Augmented Reality Cubes for Cognitive Gaming: Preliminary Usability and Game Experience Testing

    Directory of Open Access Journals (Sweden)

    Costas Boletsis

    2016-03-01

    Full Text Available Early detection is important in dementia care; however, cognitive impairment is still under-recognised and under-diagnosed. Cognitive screening and training are two important preventative treatments, which can lead to early detection of cognitive decline. In this work, the “Cognitive Augmented Reality Cubes” (CogARC system is presented, i.e. a serious game for cognitive training and screening, utilising an interaction technique based on Augmented Reality and the manipulation of tangible, physical objects (cubes. The game is a collection of cognitive mini-games of preventative nature and is, primarily, targeting elderly players (≥60 years old. A preliminary testing was conducted focusing on the game experience that CogARC offers (utilising the In-Game Experience Questionnaire, the usability of the system (using the System Usability Scale, and the specific user observations and remarks, as documented by open, semi-structured interviews.  Overall, CogARC demonstrated satisfying positive responses, however, the negative reactions indicated that there are specific problems with aspects of the interaction technique and a number of mini-games. The open interview shed more light on the specific issues of each mini-game and further interpretation of user interactions. The current study managed to provide interesting insights into the game design elements, integration of Augmented Reality, tangible interaction of the system, and on how elderly players perceive and use those interaction components. 

  10. Testing and Evaluation for Web Usability Based on Extended Markov Chain Model

    Institute of Scientific and Technical Information of China (English)

    MAO Cheng-ying; LU Yan-sheng

    2004-01-01

    As the increasing popularity and complexity of Web applications and the emergence of their new characteristics, the testing and maintenance of large, complex Web applications are becoming more complex and difficult.Web applications generally contain lots of pages and are used by enormous users.Statistical testing is an effective way of ensuring their quality.Web usage can be accurately described by Markov chain which has been proved to be an ideal model for software statistical testing.The results of unit testing can be utilized in the latter stages, which is an important strategy for bottom-to-top integration testing, and the other improvement of extended Markov chain model (EMM) is to present the error type vector which is treated as a part of page node.This paper also proposes the algorithm for generating test cases of usage paths.Finally, optional usage reliability evaluation methods and an incremental usability regression testing model for testing and evaluation are presented.

  11. Expected usability is not a valid indicator of experienced usability

    Directory of Open Access Journals (Sweden)

    Meinald T. Thielsch

    2015-09-01

    Full Text Available Usability is a core construct of website evaluation and inherently defined as interactive. Yet, when analysing first impressions of websites, expected usability, i.e., before use, is of interest. Here we investigate to what extend ratings of expected usability are related to (a experienced usability, i.e., ratings after use, and (b objective usability measures, i.e., task performance. Furthermore, we try to elucidate how ratings of expected usability are correlated to aesthetic judgments. In an experiment, 57 participants submitted expected usability ratings after the presentation of website screenshots in three viewing-time conditions (50, 500, and 10,000 ms and after an interactive task (experienced usability. Additionally, objective usability measures (task completion and duration and subjective aesthetics evaluations were recorded for each website. The results at both the group and individual level show that expected usability ratings are not significantly related either to experienced usability or objective usability measures. Instead, they are highly correlated with aesthetics ratings. Taken together, our results highlight the need for interaction in empirical website usability testing, even when exploring very early usability impressions. In our study, user ratings of expected usability were no valid proxy neither for objective usability nor for experienced website usability.

  12. Mobile Usability

    DEFF Research Database (Denmark)

    Aryana, Bijan; Clemmensen, Torkil

    2013-01-01

    In this article, a country specific comparative mobile usability study is presented, using Iran and Turkey as the two chosen emerging/emergent nation exemplars of smartphone usage and adoption. In a focus group study, three mobile applications were selected by first-time users of smartphones....... In both countries, the music player application was tested, wherein common patterns of accessing and sorting songs emerged. Whereas the Iranian users appeared to be more interested in social networking via use of an SMS service, the Turkish users tended to prefer to apply hierarchies to their own daily...

  13. Usability Constructs

    DEFF Research Database (Denmark)

    Hertzum, Morten; Clemmesen, Torkil; Hornbæk, Kasper Anders Søren

    2007-01-01

    Whereas research on usability predominantly employs universal definitions of the aspects that comprise usability, people experience their use of information systems through personal constructs. Based on 48 repertory-grid interviews, this study investigates how such personal constructs are affecte...

  14. Testing Aspects of the Usability of an Online Learner Dictionary Prototype: A Product- and Process-Oriented Study

    Science.gov (United States)

    Hamel, Marie-Josee

    2012-01-01

    This article reports on a study which took place in the context of the design and development of an online dictionary prototype for learners of French. Aspects of the "usability", i.e. the quality of the "learner-task-dictionary interaction" of the prototype were tested. Micro-tasks were designed to focus on learners' productive knowledge of…

  15. Images of Usability

    DEFF Research Database (Denmark)

    Hertzum, Morten

    2010-01-01

    unless confronted with alternative images. This study delineates six images of usability: universal usability, situational usability, perceived usability, hedonic usability, organizational usability, and cultural usability. The different foci of the images provide opportunities for becoming sensitized...

  16. Web-Based Testing: Exploring the Relationship between Hardware Usability and Test Performance

    Science.gov (United States)

    Huff, Kyle; Cline, Melinda; Guynes, Carl S.

    2012-01-01

    Web-based testing has recently become common in both academic and professional settings. A web-based test is administered through a web browser. Individuals may complete a web-based test at nearly any time and at any place. In addition, almost any computer lab can become a testing center. It is important to understand the environmental issues that…

  17. Usability testing of gaming and social media applications for stroke and cerebral palsy upper limb rehabilitation.

    Science.gov (United States)

    Valdés, Bulmaro A; Hilderman, Courtney G E; Hung, Chai-Ting; Shirzad, Navid; Van der Loos, H F Machiel

    2014-01-01

    As part of the FEATHERS (Functional Engagement in Assisted Therapy Through Exercise Robotics) project, two motion tracking and one social networking applications were developed for upper limb rehabilitation of stroke survivors and teenagers with cerebral palsy. The project aims to improve the engagement of clients during therapy by using video games and a social media platform. The applications allow users to control a cursor on a personal computer through bimanual motions, and to interact with their peers and therapists through the social media. The tracking applications use either a Microsoft Kinect or a PlayStation Eye camera, and the social media application was developed on Facebook. This paper presents a usability testing of these applications that was conducted with therapists from two rehabilitation clinics. The "Cognitive Walkthrough" and "Think Aloud" methods were used. The objectives of the study were to investigate the ease of use and potential issues or improvements of the applications, as well as the factors that facilitate and impede the adoption of technology in current rehabilitation programs.

  18. Iterative Design and Usability Testing of the Imhere System for Managing Chronic Conditions and Disability.

    Science.gov (United States)

    Fairman, Andrea D; Yih, Erika T; McCoy, Daniel F; Lopresti, Edmund F; McCue, Michael P; Parmanto, Bambang; Dicianno, Brad E

    2016-01-01

    A novel mobile health platform, Interactive Mobile Health and Rehabilitation (iMHere), is being developed to support wellness and self-management among people with chronic disabilities. The iMHere system currently includes a smartphone app with six modules for use by persons with disabilities and a web portal for use by medical and rehabilitation professionals or other support personnel. Our initial clinical research applying use of this system provides insight into the feasibility of employing iMHere in the development of self-management skills in young adults (ages 18-40 years) with spina bifida (SB) (Dicianno, Fairman, et al., 2015). This article describes the iterative design of the iMHere system including usability testing of both the app modules and clinician portal. Our pilot population of persons with SB fostered the creation of a system appropriate for people with a wide variety of functional abilities and needs. As a result, the system is appropriate for use by persons with various disabilities and chronic conditions, not only SB. In addition, the diversity of professionals and support personnel involved in the care of persons with SB also enabled the design and implementation of the iMHere system to meet the needs of an interdisciplinary team of providers who treat various conditions. The iMHere system has the potential to foster communication and collaboration among members of an interdisciplinary healthcare team, including individuals with chronic conditions and disabilities, for a client-centered approach to support self-management skills.

  19. Evaluating Web Usability

    Science.gov (United States)

    Snider, Jean; Martin, Florence

    2012-01-01

    Web usability focuses on design elements and processes that make web pages easy to use. A website for college students was evaluated for underutilization. One-on-one testing, focus groups, web analytics, peer university review and marketing focus group and demographic data were utilized to conduct usability evaluation. The results indicated that…

  20. Universal Usability

    Science.gov (United States)

    Horton, Sarah; Leventhal, Laura

    Universal usability of World Wide Web (Web) environments—that is, having 90% of households as successful users—requires universal access, usability, and universal design. Factors such as Web technology and user-centered design contribute to universal access and usability, but key to universal usability is a universal design methodology. Universal design principles for the Web follow from universal design principles for the built environment, and emphasize perceptibility, self-explanation, and tailorability for the user. Universally usable Web environments offer the benefit of expanded participation, as well as the unanticipated benefits that generally follow from innovative design initiatives. However, to achieve Web universal usability, Web designers need tools that facilitate the design of intuitive interfaces without sacrificing universal access.

  1. Global usability

    CERN Document Server

    Douglas, Ian

    2011-01-01

    The concept of usability has become an increasingly important consideration in the design of all kinds of technology. As more products are aimed at global markets and developed through internationally distributed teams, usability design needs to be addressed in global terms. Interest in usability as a design issue and specialist area of research and education has developed steadily in North America and Europe since the 1980's. However, it is only over the last ten years that it has emerged as a global concern. Global Usability provides an introduction to the important issues in globalizing des

  2. Development and usability testing of a web-based smoking cessation treatment for smokers with schizophrenia

    Directory of Open Access Journals (Sweden)

    Mary F. Brunette

    2016-05-01

    Conclusion: The prototype website was usable and satisfactory. With training and support, home use of this cessation website appears to be feasible and promising for cessation among smokers with schizophrenia. Further research is needed to evaluate web-based cessation treatment in people with psychotic disorders.

  3. Usability at the CELSTEC Medialab

    OpenAIRE

    Storm, Jeroen; Kostons, Danny

    2009-01-01

    Storm, J., & Kostons, D. (2009). Usability at the CELSTEC MediaLab. Presentation about the usability testing, usability research and User Centered Design conducted at the CELSTEC MediaLab. July, 7, 2009, Heerlen, The Netherlands: Open University of the Netherlands.

  4. Evaluating Usability

    DEFF Research Database (Denmark)

    Nørgaard, Mie; Høegh, Rune T.

    2008-01-01

    Usability evaluation is widely accepted as a valuable activity in software development. However, how results effectively are fed back to developers is still a relatively unexplored area. We argue that usability feedback can be understood as an argument for a series of usability problems......, and that basic concepts from argumentation theory can help us understand how to create persuasive feedback. We revisit two field studies on usability feedback to study if concepts from Toulmin's model for argumentation and Aristotle's modes of persuasion can explain why some feedback formats outperform others....... We recommend that evaluators specifically back up the warrants behind their usability claims, that their arguments use several modes of persuasion, and that they present feedback in browsable amounts not to overwhelm developers with information. For complex and controversial problems, we advise...

  5. Development and usability testing of a web-based cancer symptom and quality-of-life support intervention.

    Science.gov (United States)

    Wolpin, S E; Halpenny, B; Whitman, G; McReynolds, J; Stewart, M; Lober, W B; Berry, D L

    2015-03-01

    The feasibility and acceptability of computerized screening and patient-reported outcome measures have been demonstrated in the literature. However, patient-centered management of health information entails two challenges: gathering and presenting data using "patient-tailored" methods and supporting "patient-control" of health information. The design and development of many symptom and quality-of-life information systems have not included opportunities for systematically collecting and analyzing user input. As part of a larger clinical trial, the Electronic Self-Report Assessment for Cancer-II project, participatory design approaches were used to build and test new features and interfaces for patient/caregiver users. The research questions centered on patient/caregiver preferences with regard to the following: (a) content, (b) user interface needs, (c) patient-oriented summary, and (d) patient-controlled sharing of information with family, caregivers, and clinicians. Mixed methods were used with an emphasis on qualitative approaches; focus groups and individual usability tests were the primary research methods. Focus group data were content analyzed, while individual usability sessions were assessed with both qualitative and quantitative methods. We identified 12 key patient/caregiver preferences through focus groups with 6 participants. We implemented seven of these preferences during the iterative design process. We deferred development for some of the preferences due to resource constraints. During individual usability testing (n = 8), we were able to identify 65 usability issues ranging from minor user confusion to critical errors that blocked task completion. The participatory development model that we used led to features and design revisions that were patient centered. We are currently evaluating new approaches for the application interface and for future research pathways. We encourage other researchers to adopt user-centered design approaches when building

  6. Performance, usability and comparison of two versions of a new macular vision test: the handheld Radial Shape Discrimination test

    Directory of Open Access Journals (Sweden)

    Jae Y. Ku

    2016-11-01

    Full Text Available Background Central vision, critical for everyday tasks such as reading and driving, is impacted by age-related changes in the eye and by diseases such as age-related macular degeneration. The detection of changes in macular function is therefore important. The Radial Shape Discrimination (RSD test measures the threshold at which distortions in a radial frequency pattern can be detected and there is evidence that it is more sensitive to macular pathology than visual acuity (VA. It also provides a more quantitative measure of macular function than the commonly available Amsler grid. Recently, handheld versions of the test (hRSD in which stimuli are presented on mobile devices (e.g., Apple iPod Touch, iPhone have been developed. We investigated the characteristics of the hRSD test in healthy participants. Methods Data were collected using both three-alternative forced choice (3AFC and 4AFC versions of the hRSD test, presented on an Apple iPod Touch. For the 3AFC version, data from a single test session were available for 186 (72 male; mean ± SD age 42 ± 17y; range 16–90y healthy participants. Test-retest data were available for subgroups of participants (intra-session: N = 74; tests approximately 2 months apart: N = 30; tests 39 months apart: N = 15. The 3AFC and 4AFC versions were directly compared in 106 participants who also completed a usability questionnaire. Distance and near VA and Pelli Robson Contrast Sensitivity (CS data were collected and undilated fundoscopy performed on the majority of participants. Results Mean (±SD 3AFC hRSD threshold was −0.77 ± 0.14 logMAR, and was statistically significantly correlated with age (Pearson r = 0.35; p < 0.001. The linear regression of hRSD threshold on age had a slope of +0.0026 compared to +0.0051 for near VA (which also correlated with age: r = 0.51; p < 0.001. There were no statistically significant differences in hRSD thresholds for any of the test-retest subgroups. We

  7. Control concept for a hybrid engine test device composed of a water vortex brake and an asynchronous machine; Regelungskonzept fuer einen Hybrid-Motorenpruefstand

    Energy Technology Data Exchange (ETDEWEB)

    Maeenpaeae, A. [ABB Automation Products, Mannheim (Germany); Fischer, G. [Technische Univ. Darmstadt (Germany)

    2000-07-01

    New environmental laws require lower exhaust limits of motor vehicles all over the world. To test these limits, drive-cycle tests are performed on engine test devices. Future laws will require the simulation od downhill driving, which requires extensive changes to the engine test devices. Hybrid test devices with a water vortex brake and an asynchronous machine could be advantageous. A new control concept for those hybrid test devices is described here. (orig.) [German] Neue Umweltgesetze druecken weltweit die Abgasgrenzwerte von Automobilen nach unten. Zur Ueberpruefung dieser Grenzwerte dienen Fahrzyklus-Testreihen auf Motorenpruefstaenden. Kuenftige Vorschriften erfordern dabei bald die Simulation des 'Schiebebetriebs' (wie bei Bergabfahrten). Das erfordert aufwendige Umruestungen bei den Motorenpruefstaenden. Eine preisguenstige Loesung stellen Hybrid-Pruefstaende aus einer Wasserwirbelbremse und einer Asynchron-Maschine dar. Ein neues Regelkonzept dafuer wird hier beschrieben. (orig.)

  8. Usability Testing of Web Based Educational Multimedia by Eye Tracking Method

    Directory of Open Access Journals (Sweden)

    Servet BAYRAM

    2011-06-01

    Full Text Available Usability is one of the factors that can affect the success of students where learning processes are supported by internet and web technologies. In this study, usability factors for effective design and usage of web based multimedia packages created for educational purposes are evaluated. The research, experiments and analysis are done in the Human–Computer Interaction Laboratory that resides in Computer Education and Instructional Technologies Department of Marmara University. Data for the experiment are collected by using screen records which contain eye and mouse motions. For the analysis of data, fixation count, sequence and dwell time values in gridded area of interest; fixation count, heat map and scanpath values in whole are considered. The results obtained from this study can be used for design and validation of computer-based materials like virtual class applications, learning objects, educational applications, training applications and educational games.

  9. Cultural Usability

    DEFF Research Database (Denmark)

    Shi, Qingxin

    2007-01-01

    Culture has already played an important role in the global market. It not only affects products, but also impacts on usability evaluation methods. This project aims to examine in the established thinking aloud usability evaluation method (TA UEM), how does the evaluator build a supportive...... relationship and communicate effectively with the user in order to find relevant usability problems in culturally localized applications. It includes three parts, pilot study, field study and experiments, to get both qualitative data and quantitative data. From this project, we hope to find an effective way...

  10. Asynchronous DSP-core

    OpenAIRE

    Østvand, Jon

    2007-01-01

    In this thesis multipliers with and without completion detection has been implemented using a 90 nm library to compare their properties reguarding completion time, area and power consumption. The structures tested were array and shiftand-add multipliers. The results were that when having larger bit-lengths, an asynchronous shift-and-add multiplier with completion detection can yield good completion times compared to a regular shift-and-add multiplier. Due to the large cost in area and power c...

  11. USABILITY TESTING OF JAPANESE CAPTIONS SEGMENTATION SYSTEM TO SCAFFOLD BEGINNERS TO COMPREHEND JAPANESE VIDEOS

    Directory of Open Access Journals (Sweden)

    Ya-Fei Yang

    2013-06-01

    Full Text Available A major learning difficulty of Japanese foreign language (JFL learners is the complex composition of two syllabaries, hiragana and katakana, and kanji characters adopted from logographic Chinese ones. As the number of Japanese language learners increases, computer-assisted Japanese language education gradually gains more attention. This study aimed to adopt a Japanese word segmentation system to help JFL learners overcome literacy problems. This study adopted MeCab, a Japanese morphological analyzer and part-of-speech (POS tagger, to segment Japanese texts into separate morphemes by adding spaces and to attach POS tags to each morpheme for beginners. The participants were asked to participate in three experimental activities involvingwatching two Japanese videos with general or segmented Japanese captions and complete the Nielsen’s Attributes of Usability (NAU survey and the After Scenario Questionnaire (ASQ to evaluate the usability of the learning activities. The results of the system evaluation showed that the videos with the segmented captions could increase the participants’ learning motivation and willingness to adopt the word segmentation system to learn Japanese.

  12. A review of principles in design and usability testing of tactile technology for individuals with visual impairments.

    Science.gov (United States)

    Horton, Emily L; Renganathan, Ramkesh; Toth, Bryan N; Cohen, Alexa J; Bajcsy, Andrea V; Bateman, Amelia; Jennings, Mathew C; Khattar, Anish; Kuo, Ryan S; Lee, Felix A; Lim, Meilin K; Migasiuk, Laura W; Zhang, Amy; Zhao, Oliver K; Oliveira, Marcio A

    2017-01-01

    To lay the groundwork for devising, improving, and implementing new technologies to meet the needs of individuals with visual impairments, a systematic literature review was conducted to: a) describe hardware platforms used in assistive devices, b) identify their various applications, and c) summarize practices in user testing conducted with these devices. A search in relevant EBSCO databases for articles published between 1980 and 2014 with terminology related to visual impairment, technology, and tactile sensory adaptation yielded 62 articles that met the inclusion criteria for final review. It was found that while earlier hardware development focused on pin matrices, the emphasis then shifted toward force feedback haptics and accessible touch screens. The inclusion of interactive and multimodal features has become increasingly prevalent. The quantity and consistency of research on navigation, education, and computer accessibility suggest that these are pertinent areas of need for the visually impaired community. Methodologies for usability testing ranged from case studies to larger cross-sectional studies. Many studies used blindfolded sighted users to draw conclusions about design principles and usability. Altogether, the findings presented in this review provide insight on effective design strategies and user testing methodologies for future research on assistive technology for individuals with visual impairments.

  13. Interactivity Centered Usability Evaluation (ICUE) for Course Management Systems

    Science.gov (United States)

    Yoon, Sangil

    2010-01-01

    ICUE (Interactivity Centered Usability Evaluation) is an enhanced usability testing protocol created by the researcher. ICUE augments the facilitator's role for usability testing, and offers strategies in developing and presenting usability tasks during a testing session. ICUE was designed to address weaknesses found in the usability evaluation of…

  14. Self-calibration algorithm in an asynchronous P300-based brain-computer interface

    Science.gov (United States)

    Schettini, F.; Aloise, F.; Aricò, P.; Salinari, S.; Mattia, D.; Cincotti, F.

    2014-06-01

    Objective. Reliability is a desirable characteristic of brain-computer interface (BCI) systems when they are intended to be used under non-experimental operating conditions. In addition, their overall usability is influenced by the complex and frequent procedures that are required for configuration and calibration. Earlier studies examined the issue of asynchronous control in P300-based BCIs, introducing dynamic stopping and automatic control suspension features. This report proposes and evaluates an algorithm for the automatic recalibration of the classifier's parameters using unsupervised data. Approach. Ten healthy subjects participated in five P300-based BCI sessions throughout a single day. First, we examined whether continuous adaptation of control parameters improved the accuracy of the asynchronous system over time. Then, we assessed the performance of the self-calibration algorithm with respect to the no-recalibration and supervised calibration conditions with regard to system accuracy and communication efficiency. Main results. Offline tests demonstrated that continuous adaptation of the control parameters significantly increased the communication efficiency of asynchronous P300-based BCIs. The self-calibration algorithm correctly assigned labels to unsupervised data with 95% accuracy, effecting communication efficiency that was comparable with that of supervised repeated calibration. Significance. Although additional online tests that involve end-users under non-experimental conditions are needed, these preliminary results are encouraging, from which we conclude that the self-calibration algorithm is a promising solution to improve P300-based BCI usability and reliability.

  15. Experimental Platform for Usability Testing of Secure Medical Sensor Network Protocols

    DEFF Research Database (Denmark)

    Andersen, Jacob; Lo, Benny P.; Yang, Guang-Zhong

    2008-01-01

    designed security mechanisms are essential. Several experimental sensor network platforms have emerged in recent years targeted for clinical use. However, few of them consider the importance of security issues such as privacy and access control, and how these can impact the usability of the platform, while......Implementing security mechanisms such as access control for clinical use is a challenging research issue in BSN due to its required heterogeneous operating responses ranging from chronic diseases management to emergency care. To ensure the clinical uptake of the BSN technology, appropriately...... others develop BSN security without considering how a prototype implementation would be received by clinicians in real-life situations. The purpose of this paper is to present our initial effort in building a flexible experimental platform for providing a basic infrastructure with symmetric AES...

  16. Testing an Academic Library Website for Usability with Faculty and Graduate Students

    Directory of Open Access Journals (Sweden)

    Monica Claassen‐Wilson

    2009-12-01

    Full Text Available Objectives – This usability study was developed to observe faculty and graduate students’ reactions to a recent redesign of the University of Kansas (KU Libraries’ website. The redesign included new navigational features, introduction of a federated search tool, a quick search box on the front page, and research subject pages. The study also provided the opportunity to observe the practices of faculty and graduate students in locating and retrieving information on the Libraries’ website.Methods – Ten participants (five faculty and five graduate students representing diverse disciplines were solicited for the study. Participants were required to access the Libraries’ website to answer a series of questions regarding new and updated features of the website. Observational analysis using Morae™ software was conducted and interviews with each participant provided details of their opinions on how these new features would influence their research and teaching activities.Results – Most of the participants either did not notice or ignored the major website changes. Links to and locations of commonly used resources (e.g. catalogue; databases; e‐journals had been changed minimally, and the faculty and graduate student participants gravitated to those familiar features to complete tasks. Prior to the study, participants had not accessed the new discovery tools; however, once previewed, responses to the tools’ utility were generally favourable. After using the federated search tool on a familiar topic, several participants noted that, when directed to databases they had not previously considered, they were able to locate citations they had missed in the past. Observers noted pitfalls in navigating the site such as inconsistent underscoring of links, ambiguous terminology, and unclear icons meant to expand subject heading lists. Unexpected searching behaviours were observed, including inconsistent and lack of conceptual understanding in

  17. Asynchronous P300-Based Brain-Computer Interface to Control a Virtual Environment : Initial Tests on End Users

    NARCIS (Netherlands)

    Aloise, Fabio; Schettini, Francesca; Arico, Pietro; Salinari, Serenella; Guger, Christoph; Rinsma, Johanna; Aiello, Marco; Mattia, Donatella; Cincotti, Febo

    2011-01-01

    Motor disability and/or ageing can prevent individuals from fully enjoying home facilities, thus worsening their quality of life. Advances in the field of accessible user interfaces for domotic appliances can represent a valuable way to improve the independence of these persons. An asynchronous P300

  18. Psychology Experiment Authoring Kit (PEAK): formal usability testing of an easy-to-use method for creating computerized experiments.

    Science.gov (United States)

    Schneider, Walter; Bolger, D J; Eschman, Amy; Neff, Christopher; Zuccolotto, Anthony P

    2005-05-01

    In academic courses in which one task for the students is to understand empirical methodology and the nature of scientific inquiry, the ability of students to create and implement their own experiments allows them to take intellectual ownership of, and greatly facilitates, the learning process. The Psychology Experiment Authoring Kit (PEAK) is a novel spreadsheet-based interface allowing students and researchers with rudimentary spreadsheet skills to create cognitive and cognitive neuroscience experiments in minutes. Students fill in a spreadsheet listing of independent variables and stimuli, insert columns that represent experimental objects such as slides (presenting text, pictures, and sounds) and feedback displays to create complete experiments, all within a single spreadsheet. The application then executes experiments with centisecond precision. Formal usability testing was done in two stages: (1) detailed coding of 10 individual subjects in one-on-one experimenter/subject videotaped sessions and (2) classroom testing of 64 undergraduates. In both individual and classroom testing, the students learned to effectively use PEAK within 2 h, and were able to create a lexical decision experiment in under 10 min. Findings from the individual testing in Stage 1 resulted in significant changes to documentation and training materials and identification of bugs to be corrected. Stage 2 testing identified additional bugs to be corrected and new features to be considered to facilitate student understanding of the experiment model. Such testing will improve the approach with each semester. The students were typically able to create their own projects in 2 h.

  19. Asynchronous Parallelization of a CFD Solver

    Directory of Open Access Journals (Sweden)

    Daniel S. Abdi

    2015-01-01

    Full Text Available A Navier-Stokes equations solver is parallelized to run on a cluster of computers using the domain decomposition method. Two approaches of communication and computation are investigated, namely, synchronous and asynchronous methods. Asynchronous communication between subdomains is not commonly used in CFD codes; however, it has a potential to alleviate scaling bottlenecks incurred due to processors having to wait for each other at designated synchronization points. A common way to avoid this idle time is to overlap asynchronous communication with computation. For this to work, however, there must be something useful and independent a processor can do while waiting for messages to arrive. We investigate an alternative approach of computation, namely, conducting asynchronous iterations to improve local subdomain solution while communication is in progress. An in-house CFD code is parallelized using message passing interface (MPI, and scalability tests are conducted that suggest asynchronous iterations are a viable way of parallelizing CFD code.

  20. Accuracy, precision, usability, and cost of portable silver test methods for ceramic filter factories.

    Science.gov (United States)

    Meade, Rhiana D; Murray, Anna L; Mittelman, Anjuliee M; Rayner, Justine; Lantagne, Daniele S

    2017-02-01

    Locally manufactured ceramic water filters are one effective household drinking water treatment technology. During manufacturing, silver nanoparticles or silver nitrate are applied to prevent microbiological growth within the filter and increase bacterial removal efficacy. Currently, there is no recommendation for manufacturers to test silver concentrations of application solutions or filtered water. We identified six commercially available silver test strips, kits, and meters, and evaluated them by: (1) measuring in quintuplicate six samples from 100 to 1,000 mg/L (application range) and six samples from 0.0 to 1.0 mg/L (effluent range) of silver nanoparticles and silver nitrate to determine accuracy and precision; (2) conducting volunteer testing to assess ease-of-use; and (3) comparing costs. We found no method accurately detected silver nanoparticles, and accuracy ranged from 4 to 91% measurement error for silver nitrate samples. Most methods were precise, but only one method could test both application and effluent concentration ranges of silver nitrate. Volunteers considered test strip methods easiest. The cost for 100 tests ranged from 36 to 1,600 USD. We found no currently available method accurately and precisely measured both silver types at reasonable cost and ease-of-use, thus these methods are not recommended to manufacturers. We recommend development of field-appropriate methods that accurately and precisely measure silver nanoparticle and silver nitrate concentrations.

  1. Web-Based Intervention to Reduce Substance Abuse and Depressive Symptoms in Mexico: Development and Usability Test

    Science.gov (United States)

    2016-01-01

    Background The development of Web-based interventions for substance abuse in Latin America is a new field of interest with great potential for expansion to other Spanish-speaking countries. Objective This paper describes a project aimed to develop and evaluate the usability of the Web-based Help Program for Drug Abuse and Depression (Programa de Ayuda para Abuso de Drogas y Depresión, PAADD, in Spanish) and also to construct a systematic frame of reference for the development of future Web-based programs. Methods The PAADD aims to reduce substance use and depressive symptoms with cognitive behavioral techniques translated into Web applications, aided by the participation of a counselor to provide support and guidance. This Web-based intervention includes 4 steps: (1) My Starting Point, (2) Where Do I Want to Be? (3) Strategies for Change, and (4) Maintaining Change. The development of the program was an interactive multistage process. The first stage defined the core structure and contents, which were validated in stage 2 by a group of 8 experts in addiction treatment. Programming of the applications took place in stage 3, taking into account 3 types of end users: administrators, counselors, and substance users. Stage 4 consisted of functionality testing. In stage 5, a total of 9 health professionals and 20 drug users currently in treatment voluntarily interacted with the program in a usability test, providing feedback about adjustments needed to improve users’ experience. Results The main finding of stage 2 was the consensus of the health professionals about the cognitive behavioral strategies and techniques included in PAADD being appropriate for changing substance use behaviors. In stage 5, the health professionals found the functionalities easy to learn; their suggestions were related to the page layout, inclusion of confirmation messages at the end of activities, avoiding “read more” links, and providing feedback about every activity. On the other hand

  2. Design and Usability Testing of an mHealth Application for Midwives in Rural Ghana

    Science.gov (United States)

    Velez, Olivia

    2011-01-01

    Midwives in Ghana provide the majority of rural primary and maternal healthcare services, but have limited access to data for decision making and knowledge work. Few mobile health (mHealth) applications have been designed for midwives. The study purpose was to design and test an mHealth application (mClinic) that can improve data access and reduce…

  3. The Development of MSFC Usability Lab

    Science.gov (United States)

    Cheng, Yiwei; Richardson, Sally

    2010-01-01

    This conference poster reviews the development of the usability lab at Marshall Space Flight Center. The purpose of the lab was to integrate a fully functioning usability laboratory to provide a resource for future human factor assessments. and to implement preliminary usability testing on a MSFC website to validate the functionality of the lab.

  4. Evaluating innovative items for the NCLEX, part I: usability and pilot testing.

    Science.gov (United States)

    Wendt, Anne; Harmes, J Christine

    2009-01-01

    National Council of State Boards of Nursing (NCSBN) has recently conducted preliminary research on the feasibility of including various types of innovative test questions (items) on the NCLEX. This article focuses on the participants' reactions to and their strategies for interacting with various types of innovative items. Part 2 in the May/June issue will focus on the innovative item templates and evaluation of the statistical characteristics and the level of cognitive processing required to answer the examination items.

  5. FOUUX : A Framework for Usability & User Experience

    OpenAIRE

    Tan, Jia

    2009-01-01

    The main focus of the research in this thesis is to develop a consolidated framework of usability and user experience testing for telecom companies. The existing usability standards, literature and models are reviewed. Different usability evaluation methods; user experience definitions and evaluation methods are identified through a comprehensive literature survey. A brief discussion of the relationship between usability and user experience together with the challenges are also presented. Bas...

  6. Spoken Dialogue Interfaces: Integrating Usability

    Science.gov (United States)

    Spiliotopoulos, Dimitris; Stavropoulou, Pepi; Kouroupetroglou, Georgios

    Usability is a fundamental requirement for natural language interfaces. Usability evaluation reflects the impact of the interface and the acceptance from the users. This work examines the potential of usability evaluation in terms of issues and methodologies for spoken dialogue interfaces along with the appropriate designer-needs analysis. It unfolds the perspective to the usability integration in the spoken language interface design lifecycle and provides a framework description for creating and testing usable content and applications for conversational interfaces. Main concerns include the problem identification of design issues for usability design and evaluation, the use of customer experience for the design of voice interfaces and dialogue, and the problems that arise from real-life deployment. Moreover it presents a real-life paradigm of a hands-on approach for applying usability methodologies in a spoken dialogue application environment to compare against a DTMF approach. Finally, the scope and interpretation of results from both the designer and the user standpoint of usability evaluation are discussed.

  7. How do usability professionals construe usability?

    DEFF Research Database (Denmark)

    Hertzum, Morten; Clemmensen, Torkil

    2012-01-01

    Usability professionals have attained a specialist role in systems-development projects. This study analyzes usability professionals’ operational understanding of usability by eliciting the constructs they employ in their thinking about system use. We approach usability broadly and without a priori...... distinguishing it from user experience. On the basis of repertory-grid interviews with 24 Chinese, Danish, and Indian usability professionals we find that they make use of more utilitarian than experiential, i.e. user-experience related, constructs. This indicates that goal-related performance is central...... to their thinking about usability, whereas they have less elaborate sets of experiential constructs. The usability professionals mostly construe usability at an individual level, rather than at organizational and environmental levels. The few exceptions include effectiveness constructs, which are evenly spread...

  8. Compositional asynchronous membrane systems

    Institute of Scientific and Technical Information of China (English)

    Cosmin Bonchis; Cornel Izbasa; Gabriel Ciobanu

    2007-01-01

    This paper presents an algorithmic way of building complex membrane systems by coupling elementary membranes. Its application seems particularly valuable in the case of asynchronous membrane systems, since the resulting membrane system remains asynchronous. The composition method is based on a handshake mechanism implemented by using antiport rules and promoters.

  9. Iterative Design and Usability Testing of the iMHere System for Managing Chronic Conditions and Disability

    Directory of Open Access Journals (Sweden)

    Andrea D. Fairman

    2016-07-01

    Full Text Available A novel mobile health platform, Interactive Mobile Health and Rehabilitation (iMHere, is being developed to support wellness and self-management among people with chronic disabilities. The iMHere system currently includes a smartphone app with six modules for use by persons with disabilities and a web portal for use by medical and rehabilitation professionals or other support personnel. Our initial clinical research applying use of this system provides insight into the feasibility of employing iMHere in the development of self-management skills in young adults (ages 18-40 years with spina bifida (Dicianno, Fairman, McCue, Parmanto, Yih, et al., 2015. This article is focused on describing the iterative design of the iMHere system including usability testing of both the app modules and clinician portal. Our pilot population of persons with spina bifida fostered the creation of a system appropriate for people with a wide variety of functional abilities and needs. As a result, the system is appropriate for use by persons with various disabilities and chronic conditions, not only spina bifida. In addition, the diversity of professionals and support personnel involved in the care of persons with spina bifida (SB also enabled the design and implementation of the iMHere system to meet the needs of an interdisciplinary team of providers who treat various conditions. The iMHere system has the potential to foster communication and collaboration among members of an interdisciplinary healthcare team, including individuals with chronic conditions and disabilities, for client-centered approach to support self-management skills.

  10. Heating test on three-phase asynchronous motors by double-frequency or equivalent loading methods; Ensayo de calentamiento sobre motores asincronicos trifasicos por el metodo de la doble frecuencia o de la carga fantasma

    Energy Technology Data Exchange (ETDEWEB)

    Guzman, Edgardo J.; Massa, Pablo A.; Urtiaga, Ricardo [La Plata Univ. Nacional (Argentina). Facultad de Ingenieria. Dept. de Electrotecnia

    1997-12-31

    This work comments the wiring temperature tests in three-phase high power asynchronous motors. It analyses an alternative method called double frequency or equivalent loading method which should be able to present similar effects of the direct method. A comparison between both methods is presented 4 refs., 5 figs., 1 tab.; e-mail: massa at isis.unlp.edu.ar

  11. From User Interface Usability to the Overall Usability of Interactive Systems: Adding Usability in System Architecture

    Science.gov (United States)

    Taleb, Mohamed; Seffah, Ahmed; Engleberg, Daniel

    Traditional interactive system architectures such as MVC and PAC decompose the system into subsystems that are relatively independent, thereby allowing the design work to be partitioned between the user interfaces and underlying functionalities. Such architectures extend the independence assumption to usability, approaching the design of the user interface as a subsystem that can be designed and tested independently from the underlying functionality. This Cartesian dichotomy can be fallacious, as functionalities buried in the application’s logic can sometimes affect the usability of the system. Our investigations model the relationships between internal software attributes and externally visible usability factors. We propose a pattern-based approach for dealing with these relationships. We conclude by discussing how these patterns can lead to a methodological framework for improving interactive system architec-tures, and how these patterns can support the integration of usability in the software design process.

  12. Barriers to comparing the usability of electronic health records.

    Science.gov (United States)

    Ratwani, Raj M; Hettinger, A Zachary; Fairbanks, Rollin J

    2016-08-29

    Despite the widespread adoption of electronic health records (EHRs), usability of many EHRs continues to be suboptimal, with some vendors failing to meet usability standards, resulting in clinician frustration and patient safety hazards. In an effort to increase EHR vendor competition on usability, recommendations have been made and legislation drafted to develop comparison tools that would allow purchasers to better understand the usability of EHR products prior to purchase. Usability comparison can be based on EHR vendor design and development processes, vendor usability testing as part of the Office of the National Coordinator for Health Information Technology certification program, and usability of implemented products. Barriers exist within the current certified health technology program that prevent effective comparison of usability during each of these stages. We describe the importance of providing purchasers with improved information about EHR usability, barriers to making usability comparisons, and solutions to overcome these barriers.

  13. User-Centered Design of a Web Site for Library and Information Science Students: Heuristic Evaluation and Usability Testing

    Directory of Open Access Journals (Sweden)

    Laura Manzari

    2006-09-01

    Full Text Available This study describes the life cycle of a library Web site created with a user-centered design process to serve a graduate school of library and information science (LIS. Findings based on a heuristic evaluation and usability study were applied in an iterative redesign of the site to better serve the needs of this special academic library population. Recommendations for design of Web-based services for library patrons from LIS programs are discussed, as well as implications for Web sites for special libraries within larger academic library settings.

  14. VOLTAGE REGULATORS ASYNCHRONOUS GENERATORS

    Directory of Open Access Journals (Sweden)

    Grigorash O. V.

    2015-06-01

    Full Text Available A promising is currently the use of asynchronous generators with capacitive excitation as a source of electricity in stand-alone power systems. Drive asynchronous generators may exercise as a thermal engine and wind wheel wind power plant or turbines of small hydropower plants. The article discusses the structural and schematics of voltage stabilizers and frequency of asynchronous generators with improved operational and technical specifications. Technical novelty of design solutions of the magnetic system and stabilizers asynchronous generator of electricity parameters confirmed by the patents for the invention of the Russian Federation. The proposed technical solution voltage stabilizer asynchronous generators, can reduce the weight of the block capacitors excitation and reactive power compensation, as well as to simplify the control system power circuit which has less power electronic devices. For wind power plants it is an important issue not only to stabilize the voltage of the generator, but also the frequency of the current. Recommend functionality stabilizer schemes parameters of electric power made for direct frequency converters with artificial and natural switching power electronic devices. It is also proposed as part of stabilization systems use single-phase voltage, three-phase transformers with rotating magnetic field, reduce the level of electromagnetic interference generated by power electronic devices for switching, enhance the efficiency and reliability of the stabilizer.

  15. Supporting Novice Usability Practitioners with Usability Engineering Tools

    OpenAIRE

    Howarth, Jonathan Randall

    2007-01-01

    The usability of an application often plays an important role in determining its success. Accordingly, organizations that develop software have realized the need to integrate usability engineering into their development lifecycles. Although usability practitioners have successfully applied usability engineering processes to increase the usability of user-interaction designs, the literature suggests that usability practitioners experience a number of difficulties that negatively impact the...

  16. Evidence-based development and first usability testing of a social serious game based multi-modal system for early screening for atypical socio-cognitive development.

    Science.gov (United States)

    Gyori, Miklos; Borsos, Zsófia; Stefanik, Krisztina

    2015-01-01

    At current, screening for, and diagnosis of, autism spectrum disorders (ASD) are based on purely behavioral data; established screening tools rely on human observation and ratings of relevant behaviors. The research and development project in the focus of this paper is aimed at designing, creating and evaluating a social serious game based multi-modal, interactive software system for screening for high functioning cases of ASD at kindergarten age. The aims of this paper are (1) to summarize the evidence-based design process and (2) to present results from the first usability test of the system. Game topic, candidate responses, and candidate game contents were identified via an iterative literature review. On this basis, the 1st partial prototype of the fully playable game has been created, with complete data recording functionality but without the decision making component. A first usability test was carried out on this prototype (n=13). Overall results were unambiguously promising. Although sporadic difficulties in, and slightly negative attitudes towards, using the game occasionally arose, these were confined to non-target-group children only. The next steps of development include (1) completing the game design; (2) carrying out first large-n field test; (3) creating the first prototype of the decision making component.

  17. Asynchronized synchronous machines

    CERN Document Server

    Botvinnik, M M

    1964-01-01

    Asynchronized Synchronous Machines focuses on the theoretical research on asynchronized synchronous (AS) machines, which are "hybrids” of synchronous and induction machines that can operate with slip. Topics covered in this book include the initial equations; vector diagram of an AS machine; regulation in cases of deviation from the law of full compensation; parameters of the excitation system; and schematic diagram of an excitation regulator. The possible applications of AS machines and its calculations in certain cases are also discussed. This publication is beneficial for students and indiv

  18. Usability of PostgreSQL

    OpenAIRE

    2011-01-01

    My topic of the thesis is usability of PostgreSQL. It presents basic information aboutPostgreSQL, such as its history, function, and comparison with one of the most popular databases - MySQL. PostgreSQL has been tested in different environments and with different programming languages. The research is based on the documents from PostgreSQL official website.The thesis introduces and proves the usability and the compatibility of PostgreSQL. PostgreSQL has been installed on Windows workstation a...

  19. Asynchronous Multiparty Computation

    DEFF Research Database (Denmark)

    Damgård, Ivan Bjerre; Geisler, Martin; Krøigaard, Mikkel

    2009-01-01

    We propose an asynchronous protocol for general multiparty computation. The protocol has perfect security and communication complexity  where n is the number of parties, |C| is the size of the arithmetic circuit being computed, and k is the size of elements in the underlying field. The protocol g...

  20. Asynchronous P300 BCI

    DEFF Research Database (Denmark)

    Panicker, Rajesh; Puthusserypady, Sadasivan; Sun, Ying

    2010-01-01

    An asynchronous hybrid brain-computer interface (BCI) system combining the P300 and steady-state visually evoked potentials (SSVEP) paradigms is introduced. A P300 base system is used for information transfer, and is augmented to include SSVEP for control state detection. The proposed system has...

  1. Redundant Asynchronous Microprocessor System

    Science.gov (United States)

    Meyer, G.; Johnston, J. O.; Dunn, W. R.

    1985-01-01

    Fault-tolerant computer structure called RAMPS (for redundant asynchronous microprocessor system) has simplicity of static redundancy but offers intermittent-fault handling ability of complex, dynamically redundant systems. New structure useful wherever several microprocessors are employed for control - in aircraft, industrial processes, robotics, and automatic machining, for example.

  2. Multiparty Asynchronous Session Types

    DEFF Research Database (Denmark)

    Honda, Kohei; Yoshida, Nobuko; Carbone, Marco

    2016-01-01

    peers are directly abstracted as a global scenario. Global types retain the friendly type syntax of binary session types while specifying dependencies and capturing complex causal chains of multiparty asynchronous interactions. A global type plays the role of a shared agreement among communication peers...

  3. The Usability Expert’s Fear of Agility

    DEFF Research Database (Denmark)

    Nielsen, Lene; Madsen, Sabine

    2012-01-01

    This paper contributes to the HCI literature on usability practice with insights about the empirical challenges and global emerging practices caused by the advent of agile software development (ASD). In the paper we report from a worldwide study involving 12 usability professionals from 12...... different countries. The findings show that the usability professionals share a forced development and innovation in their practice that stem from their clients’ adoption and use of ASD methods. The ASD methods challenge the way usability testing is performed, the abilities of the usability expert......, the usability deliverables, and the experts’ assumptions about the importance of validity....

  4. Development and usability testing of a web-based self-management intervention for oral cancer survivors and their family caregivers.

    Science.gov (United States)

    Badr, H; Lipnick, D; Diefenbach, M A; Posner, M; Kotz, T; Miles, B; Genden, E

    2016-09-01

    Oral cancer (OC) survivors experience debilitating side effects that affect their quality of life (QOL) and that of their caregivers. This study aimed to develop and evaluate a dyadic, web-based intervention to improve survivor self-management and survivor/caregiver QOL. A qualitative needs assessment (semi-structured interviews) with 13 OC survivors and 12 caregivers was conducted to discern information and support needs as well as preferences regarding website features and tools. Results using Grounded Theory analysis showed that OC survivors and caregivers: (1) want and need practical advice about managing side effects; (2) want to reach out to other survivors/caregivers for information and support; and (3) have both overlapping and unique needs and preferences regarding website features. Usability testing (N = 6 survivors; 5 caregivers) uncovered problems with the intuitiveness, navigation and design of the website that were subsequently addressed. Users rated the website favourably on the dimensions of attractiveness, controllability, efficiency, intuitiveness and learnability, and gave it a total usability score of 80/100. Overall, this study demonstrates that OC survivors and caregivers are interested in using an online programme to improve QOL, and that providing tailored website content and features based on the person's role as survivor or caregiver is important in this population.

  5. Increasing Student Engagement Using Asynchronous Learning

    Science.gov (United States)

    Northey, Gavin; Bucic, Tania; Chylinski, Mathew; Govind, Rahul

    2015-01-01

    Student engagement is an ongoing concern for educators because of its positive association with deep learning and educational outcomes. This article tests the use of a social networking site (Facebook) as a tool to facilitate asynchronous learning opportunities that complement face-to-face interactions and thereby enable a stronger learning…

  6. Debunking health IT usability myths.

    Science.gov (United States)

    Staggers, N; Xiao, Y; Chapman, L

    2013-01-01

    Poor usability is a threat to patient safety and linked to productivity loss, workflow disruption, user frustration, sub-optimal product use and system de-installations. Although usability is receiving more attention nationally and internationally, myths about usability persist. This editorial debunks five common myths about usability (1) usability only concerns the look and feel of a product and is, therefore, only a minor concern, (2) usability is not measurable, (3) usability stifles innovation, (4) vendors are solely responsible for product usability, and (5) usability methods are not practical for use in healthcare.

  7. Personal Usability Constructs

    DEFF Research Database (Denmark)

    Hertzum, Morten; Clemmensen, Torkil; Hornbæk, Kasper

    2011-01-01

    Whereas the concept of usability is predominantly defined analytically, people relate to systems through personal usability constructs. Based on 48 repertory-grid interviews, this study investigates how such personal constructs are affected by two factors crucial to the international development ...

  8. Distributed usability evaluation

    DEFF Research Database (Denmark)

    Christensen, Lars; Frøkjær, Erik

    2010-01-01

    We present DUE (Distributed Usability Evaluation), a technique for collecting and evaluating usability data. The DUE infrastructure involves a client-server network. A client-based tool resides on the workstation of each user, providing a screen video recording, microphone input of voice commenta...

  9. Exploring Multiple Usability Perspectives

    DEFF Research Database (Denmark)

    Uldall-Espersen, Tobias

    2007-01-01

    Industrial usability work often fails to produce the expected impact on software products even though significant resources have been used on uncovering problems and suggesting improvements. So, it seems that feedback from industrial usability work lacks persuasiveness, i.e. it fails to convince ...

  10. Text Mining: (Asynchronous Sequences

    Directory of Open Access Journals (Sweden)

    Sheema Khan

    2014-12-01

    Full Text Available In this paper we tried to correlate text sequences those provides common topics for semantic clues. We propose a two step method for asynchronous text mining. Step one check for the common topics in the sequences and isolates these with their timestamps. Step two takes the topic and tries to give the timestamp of the text document. After multiple repetitions of step two, we could give optimum result.

  11. Assessing Library Instruction through Web Usability and Vocabulary Studies

    Science.gov (United States)

    Castonguay, Remi

    2008-01-01

    Can we use the methods of Web usability testing to learn about library instruction? This article is among the first in the field trying to establish a link between usability and instruction. The author discusses useful insights that Web usability can bring to our pedagogy as well as to the efficiency of library instruction. The result of a Web…

  12. Expected usability is not a valid indicator of experienced usability

    OpenAIRE

    Thielsch, Meinald T.; Ronja Engel; Gerrit Hirschfeld

    2015-01-01

    Usability is a core construct of website evaluation and inherently defined as interactive. Yet, when analysing first impressions of websites, expected usability, i.e., before use, is of interest. Here we investigate to what extend ratings of expected usability are related to (a) experienced usability, i.e., ratings after use, and (b) objective usability measures, i.e., task performance. Furthermore, we try to elucidate how ratings of expected usability are correlated to aesthetic judgments. I...

  13. Behavioral synthesis of asynchronous circuits

    DEFF Research Database (Denmark)

    Nielsen, Sune Fallgaard

    2005-01-01

    This thesis presents a method for behavioral synthesis of asynchronous circuits, which aims at providing a synthesis flow which uses and tranfers methods from synchronous circuits to asynchronous circuits. We move the synchronous behavioral synthesis abstraction into the asynchronous handshake...... is idle. This reduces unnecessary switching activity in the individual functional units and therefore the energy consumption of the entire circuit. A collection of behavioral synthesis algorithms have been developed allowing the designer to perform time and power constrained design space exploration...

  14. Analysis in usability evaluations

    DEFF Research Database (Denmark)

    Følstad, Asbjørn; Lai-Chong Law, Effie; Hornbæk, Kasper

    2010-01-01

    While the planning and implementation of usability evaluations are well described in the literature, the analysis of the evaluation data is not. We present interviews with 11 usability professionals on how they conduct analysis, describing the resources, collaboration, creation of recommendations......, and prioritization involved. The interviews indicate a lack of structure in the analysis process and suggest activities, such as generating recommendations, that are unsupported by existing methods. We discuss how to better support analysis, and propose four themes for future research on analysis in usability...

  15. Usability in Scientific Databases

    Directory of Open Access Journals (Sweden)

    Ana-Maria Suduc

    2012-07-01

    Full Text Available Usability, most often defined as the ease of use and acceptability of a system, affects the users' performance and their job satisfaction when working with a machine. Therefore, usability is a very important aspect which must be considered in the process of a system development. The paper presents several numerical data related to the history of the scientific research of the usability of information systems, as it is viewed in the information provided by three important scientific databases, Science Direct, ACM Digital Library and IEEE Xplore Digital Library, at different queries related to this field.

  16. Usability of car stereo.

    Science.gov (United States)

    Razza, Bruno Montanari; Paschoarelli, Luis Carlos

    2012-01-01

    Automotive sound systems vary widely in terms of functions and way of use between different brands and models what can bring difficulties and lack of consistency to the user. This study aimed to analyze the usability of car stereo commonly found in the market. Four products were analyzed by task analysis and after use reports and the results indicate serious usability issues with respect to the form of operation, organization, clarity and quality of information, visibility and readability, among others.

  17. Labeled Postings for Asynchronous Interaction

    Science.gov (United States)

    ChanLin, Lih-Juan; Chen, Yong-Ting; Chan, Kung-Chi

    2009-01-01

    The Internet promotes computer-mediated communications, and so asynchronous learning network systems permit more flexibility in time, space, and interaction than synchronous mode of learning. The key point of asynchronous learning is the materials for web-aided teaching and the flow of knowledge. This research focuses on improving online…

  18. A Pilot Study of the Interface Design of Cross-Cultural Web Sites through Usability Testing of Multilanguage Web Sites and Determining the Preferences of Taiwanese and American Users

    Science.gov (United States)

    Ku, David Tawei; Chang, Chia-Chi

    2014-01-01

    By conducting usability testing on a multilanguage Web site, this study analyzed the cultural differences between Taiwanese and American users in the performance of assigned tasks. To provide feasible insight into cross-cultural Web site design, Microsoft Office Online (MOO) that supports both traditional Chinese and English and contains an almost…

  19. Stand-Alone and Hybrid Positioning Using Asynchronous Pseudolites

    Directory of Open Access Journals (Sweden)

    Ciro Gioia

    2014-12-01

    Full Text Available global navigation satellite system (GNSS receivers are usually unable to achieve satisfactory performance in difficult environments, such as open-pit mines, urban canyons and indoors. Pseudolites have the potential to extend GNSS usage and significantly improve receiver performance in such environments by providing additional navigation signals. This also applies to asynchronous pseudolite systems, where different pseudolites operate in an independent way. Asynchronous pseudolite systems require, however, dedicated strategies in order to properly integrate GNSS and pseudolite measurements. In this paper, several asynchronous pseudolite/GNSS integration strategies are considered: loosely- and tightly-coupled approaches are developed and combined with pseudolite proximity and receiver signal strength (RSS-based positioning. The performance of the approaches proposed has been tested in different scenarios, including static and kinematic conditions. The tests performed demonstrate that the methods developed are effective techniques for integrating heterogeneous measurements from different sources, such as asynchronous pseudolites and GNSS.

  20. TCDQ-TCT retraction and losses during asynchronous beam dump

    CERN Document Server

    Bracco, Chiara; Quaranta, Elena; CERN. Geneva. ATS Department

    2016-01-01

    The protection provided by the TCDQs in case of asynchronous beam dump depends strongly on their correct setup. They have to respect the strict hierarchy of the full collimation system and shield the tertiary collimators in the experimental regions. This MD aimed at performing asynchronous beam dump tests with different configurations, in order to assess the minimum allowed retraction between TCTs and TCDQs and, as a consequence, on the The protection provided by the TCDQs in case of asynchronous beam dump depends strongly on their correct setup. They have to respect the strict hierarchy of the full collimation system and shield the tertiary collimators in the experimental regions. This MD aimed at performing asynchronous beam dump tests with different configurations, in order to assess the minimum allowed retraction between TCTs and TCDQs and, as a consequence, on the β* reach.

  1. Evaluation of expert system application based on usability aspects

    Science.gov (United States)

    Munaiseche, C. P. C.; Liando, O. E. S.

    2016-04-01

    Usability usually defined as a point of human acceptance to a product or a system based on understands and right reaction to an interface. The performance of web application has been influence by the quality of the interface of that web to supporting information transfer process. Preferably, before the applications of expert systems were installed in the operational environment, these applications must be evaluated first by usability testing. This research aimed to measure the usability of the expert system application using tasks as interaction media. This study uses an expert system application to diagnose skin disease in human using questionnaire method which utilize the tasks as interaction media in measuring the usability. Certain tasks were executed by the participants in observing usability value of the application. The usability aspects observed were learnability, efficiency, memorability, errors, and satisfaction. Each questionnaire question represent aspects of usability. The results present the usability value for each aspect and the total average merit for all the five-usability aspect was 4.28, this indicated that the tested expert system application is in the range excellent for the usability level, so the application can be implemented as the operated system by user. The main contribution of the study is the research became the first step in using task model in the usability evaluation for the expert system application software.

  2. Usability on the p-medicine infrastructure: an extended usability concept.

    Science.gov (United States)

    Christ-Neumann, Marie-Luise; Escrich, Ana; Anguita, Alberto; Stenzhorn, Holger; Taylor, Marian; Ramay, Hena; Rüping, Stefan; Krauth, Christian; Kuchinke, Wolfgang; Graf, Norbert; Rossi, Simona

    2014-01-01

    Usability testing methods are nowadays integrated into the design and development of health-care software, and the need for usability in health-care information technology (IT) is widely accepted by clinicians and researchers. Usability assessment starts with the identification of specific objectives that need to be tested and continues with the definition of evaluation criteria and monitoring procedures before usability tests are performed to assess the quality of all services and tasks. Such a process is implemented in the p-medicine environment and gives feedback iteratively to all software developers in the project. GCP (good clinical practice) criteria require additional usability testing of the software. For the p-medicine project (www.p-medicine.eu), an extended usability concept (EUC) was developed. The EUC covers topics like ease of use, likeability, and usefulness, usability in trial centres characterised by a mixed care and research environment and by extreme time constraints, confidentiality, use of source documents, standard operating procedures (SOA), and quality control during data handling to ensure that all data are reliable and have been processed correctly in terms of accuracy, completeness, legibility, consistence, and timeliness. Here, we describe the p-medicine EUC, focusing on two of the many key tools: ObTiMA and the Ontology Annotator (OA).

  3. Work-domain knowledge in usability evaluation

    DEFF Research Database (Denmark)

    Følstad, Asbjørn; Hornbæk, Kasper

    2010-01-01

    whether such interpretation phases improve the relevance of usability evaluations in the development of work-domain specific systems. The study included two development cases. We conclude that the interpretation phases generate additional insight and redesign suggestions related to observed usability...... impact on the software development process. The benefits of the interpretation phases may be explained by the access these provide both to the test participants’ work-domain knowledge and to their experiences as users. .......Usability evaluation helps to determine whether interactive systems support users in their work tasks. However, knowledge about those tasks and, more generally, about the work-domain is difficult to bring to bear on the processes and outcome of usability evaluation. One way to include such work...

  4. Pro asynchronous programming with .NET

    CERN Document Server

    Blewett, Richard; Ltd, Rock Solid Knowledge

    2014-01-01

    Pro Asynchronous Programming with .NET teaches the essential skill of asynchronous programming in .NET. It answers critical questions in .NET application development, such as: how do I keep my program responding at all times to keep my users happy how do I make the most of the available hardware how can I improve performanceIn the modern world, users expect more and more from their applications and devices, and multi-core hardware has the potential to provide it. But it takes carefully crafted code to turn that potential into responsive, scalable applications.With Pro Asynchronous Programming

  5. Usability Evaluation of Public Web Mapping Sites

    Science.gov (United States)

    Wang, C.

    2014-04-01

    Web mapping sites are interactive maps that are accessed via Webpages. With the rapid development of Internet and Geographic Information System (GIS) field, public web mapping sites are not foreign to people. Nowadays, people use these web mapping sites for various reasons, in that increasing maps and related map services of web mapping sites are freely available for end users. Thus, increased users of web mapping sites led to more usability studies. Usability Engineering (UE), for instance, is an approach for analyzing and improving the usability of websites through examining and evaluating an interface. In this research, UE method was employed to explore usability problems of four public web mapping sites, analyze the problems quantitatively and provide guidelines for future design based on the test results. Firstly, the development progress for usability studies were described, and simultaneously several usability evaluation methods such as Usability Engineering (UE), User-Centered Design (UCD) and Human-Computer Interaction (HCI) were generally introduced. Then the method and procedure of experiments for the usability test were presented in detail. In this usability evaluation experiment, four public web mapping sites (Google Maps, Bing maps, Mapquest, Yahoo Maps) were chosen as the testing websites. And 42 people, who having different GIS skills (test users or experts), gender (male or female), age and nationality, participated in this test to complete the several test tasks in different teams. The test comprised three parts: a pretest background information questionnaire, several test tasks for quantitative statistics and progress analysis, and a posttest questionnaire. The pretest and posttest questionnaires focused on gaining the verbal explanation of their actions qualitatively. And the design for test tasks targeted at gathering quantitative data for the errors and problems of the websites. Then, the results mainly from the test part were analyzed. The

  6. Application of Distance of Information-state Transition Theory on Usability Testing of University Portal%信息距离理论在高校门户网站易用性测度中的应用

    Institute of Scientific and Technical Information of China (English)

    袁红; 陈舒

    2012-01-01

    This paper firstly introduced the theory of website usability and the Distance of Information-state Transition (DIT) and constructed the website usability model on basis of DIT, then carried on the web usability testing on 14 universities. This study will provide a theoretical reference for enhancing the usability of university portal and the optimization of network information resources.%在阐述网站易用性和信息距离基本理论的基础上,建立基于信息距离的网站易用性测度模型,运用该模型对国内14所高校门户网站进行易用性测度。研究结论或可为提升高校门户网站的易用性及网络信息资源的优化提供理论参考。

  7. Adding SPICE to a Library Internet Site: A Recipe to Enhance Usability

    OpenAIRE

    Ingrid Tonnison; Larnish Harije; Suzanne Lewis; Lisa Cotter

    2006-01-01

    Objective - To produce a highly- usable intranet site, use the project to explore the practical application of evidence-based librarianship (EBL), and refine the library's project management methodology. Methods - Evidence was gathered via a literature review, an online survey, scenario-based usability testing, and the completion of a usability checlist. Usability issues were then addressed, guided by the Research-Based Web Design and Usability Guidelines. Results - After a preliminary ...

  8. Usability: Human Research Program - Space Human Factors and Habitability

    Science.gov (United States)

    Sandor, Aniko; Holden, Kritina L.

    2009-01-01

    The Usability project addresses the need for research in the area of metrics and methodologies used in hardware and software usability testing in order to define quantifiable and verifiable usability requirements. A usability test is a human-in-the-loop evaluation where a participant works through a realistic set of representative tasks using the hardware/software under investigation. The purpose of this research is to define metrics and methodologies for measuring and verifying usability in the aerospace domain in accordance with FY09 focus on errors, consistency, and mobility/maneuverability. Usability metrics must be predictive of success with the interfaces, must be easy to obtain and/or calculate, and must meet the intent of current Human Systems Integration Requirements (HSIR). Methodologies must work within the constraints of the aerospace domain, be cost and time efficient, and be able to be applied without extensive specialized training.

  9. Integrating Usability Evaluations into the Software Development Process

    DEFF Research Database (Denmark)

    Lizano, Fulvio

    This thesis addresses the integration of usability evaluations into the software development process. The integration here is contextualized in terms of how to include usability evaluation as an activity in the software development lifecycle. Even though usability evaluations are considered...... as relevant and strategic human–computer interaction (HCI) activities in the software development process, there are obstacles that limit the complete, effective and efficient integration of this kind of testing into the software development process. Two main obstacles are the cost of usability evaluations...... and the software developers' resistance to accepting users’ opinions regarding the lack of usability in their software systems. The ‘cost obstacle’ refers to the constraint of conducting usability evaluations in the software process due to the significant amount of resources required by this type of testing. Some...

  10. Educational software usability: Artifact or Design?

    Science.gov (United States)

    Van Nuland, Sonya E; Eagleson, Roy; Rogers, Kem A

    2017-03-01

    Online educational technologies and e-learning tools are providing new opportunities for students to learn worldwide, and they continue to play an important role in anatomical sciences education. Yet, as we shift to teaching online, particularly within the anatomical sciences, it has become apparent that e-learning tool success is based on more than just user satisfaction and preliminary learning outcomes-rather it is a multidimensional construct that should be addressed from an integrated perspective. The efficiency, effectiveness and satisfaction with which a user can navigate an e-learning tool is known as usability, and represents a construct which we propose can be used to quantitatively evaluate e-learning tool success. To assess the usability of an e-learning tool, usability testing should be employed during the design and development phases (i.e., prior to its release to users) as well as during its delivery (i.e., following its release to users). However, both the commercial educational software industry and individual academic developers in the anatomical sciences have overlooked the added value of additional usability testing. Reducing learner frustration and anxiety during e-learning tool use is essential in ensuring e-learning tool success, and will require a commitment on the part of the developers to engage in usability testing during all stages of an e-learning tool's life cycle. Anat Sci Educ 10: 190-199. © 2016 American Association of Anatomists.

  11. Working together to improve usability

    DEFF Research Database (Denmark)

    Nørgaard, Mie; Hornbæk, Kasper

    2010-01-01

    In theory, usability work is an important and well-integrated activity in developing software. In practice, collaboration on improving usability is ridden with challenges relating to conflicting professional goals, tight project schedules, and unclear usability findings. The authors study those...

  12. Software architecture analysis of usability

    NARCIS (Netherlands)

    Folmer, Eelke

    2005-01-01

    One of the qualities that has received increased attention in recent decades is usability. A software product with poor usability is likely to fail in a highly competitive market; therefore software developing organizations are paying more and more attention to ensuring the usability of their softwa

  13. Designing software Architectures for usability

    NARCIS (Netherlands)

    Bosch, J; Juristo, N

    2003-01-01

    Usability is increasingly recognized as a quality attribute that one has to design for. The conventional alternative is to measure usability on a finished system and improve it. The disadvantage of this approach is, obviously, that the cost associated with implementing usability improvements in a fu

  14. The Georgia 8th Grade Mathematics CRCT as a Crystal Ball: The Usability of a Test to Predict Students' Futures on the Math 1 EOCT

    Science.gov (United States)

    Whitby, Sarah Elizabeth

    2012-01-01

    To help teachers improve their efficiency and effectiveness, this dissertation study uses regression analysis to assess two middle Georgia counties' CRCT and Math 1 EOCT data in order to determine the usability of the CRCT to enhance instruction in Math 1. Data were collected from the 2009 and 2010 CRCT administrations and the 2010 and 2011 EOCT…

  15. Summary of Human-Machine Interface Usability Testing and Evaluation Research%人机界面可用性测试与评估研究综述

    Institute of Scientific and Technical Information of China (English)

    王波; 盛金根; 李永建

    2012-01-01

    介绍并评述人机界面可用性的定义、可用性测试与评估的指标及方法。学术界对于可用性的内涵已基本达成共识,但大多针对不同界面选取不同的测试与评估指标及权重,测试与评估方法也大都停留于主观评价,还未能深入探讨用户与系统交互过程中的内在心理机制。%Introduces and appraises the definition of human-machine/computer interface usability, evaluation index and methods of usability. Academic field has reached an agreement on the connotation of usability, but the usability evaluation mostly choose different index and weight aimming at different interface, and the evaluation methods still stay at subjective evaluation, which hasn't go deep into the user's internal psychology mechanism when they interact with system.

  16. Usability Problem Identification in Culturally Diverse Settings

    DEFF Research Database (Denmark)

    Clemmensen, Torkil

    2012-01-01

    There are indications that established methods for evaluating information system usability that have been developed for use in, e.g. Europe or the USA, fail to give reliable results in countries such as India, China or Malaysia. This paper presents the theoretical background, related work...... and a definition of culture that should be useful for studies of multiple-country usability testing. This includes a discussion of cultural fit and the consequences of cultural (in)consistencies between stakeholders in system development and use. As an illustrative example of the kind of academic research...... that needs to be done, a pilot study is described. The pilot study exemplifies themes to explore, who should be participants and where should the study be done, how to find examples of multiple-country usability testing, how to collect data and how to analyse that data and what kind of results and discussion...

  17. BRD usability requirements

    Energy Technology Data Exchange (ETDEWEB)

    Deshpande, Alina [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2015-03-12

    This document describes the usability requirements for the Biosurveillance resource directory (BRD); that is, who will be using the tool and what tasks they will be using it for. It does not include information on technical implementation (e.g., whether specific information is contained in the database or pulled on demand from other sources). It also avoids specific design ideas (such as widget descriptions) unless they are necessary to illustrate a requirement.

  18. Usability evaluation techniques in mobile commerce applications: A systematic review

    Science.gov (United States)

    Hussain, Azham; Mkpojiogu, Emmanuel O. C.

    2016-08-01

    Obviously, there are a number of literatures concerning the usability of mobile commerce (m-commerce) applications and related areas, but they do not adequately provide knowledge about usability techniques used in most of the empirical usability evaluation for m-commerce application. Therefore, this paper is aimed at producing the usability techniques frequently used in the aspect of usability evaluation for m-commerce applications. To achieve the stated objective, systematic literature review was employed. Sixty seven papers were downloaded in usability evaluation for m-commerce and related areas; twenty one most relevant studies were selected for review in order to extract the appropriate information. The results from the review shows that heuristic evaluation, formal test and think aloud methods are the most commonly used methods in m-commerce application in comparison to cognitive walkthrough and the informal test methods. Moreover, most of the studies applied control experiment (33.3% of the total studies); other studies that applied case study for usability evaluation are 14.28%. The results from this paper provide additional knowledge to the usability practitioners and research community for the current state and use of usability techniques in m-commerce application.

  19. Asynchronous Bounded Expected Delay Networks

    CERN Document Server

    Bakhshi, Rena; Fokkink, Wan; Pang, Jun

    2010-01-01

    The commonly used asynchronous bounded delay (ABD) network models assume a fixed bound on message delay. We propose a probabilistic network model, called asynchronous bounded expected delay (ABE) model. Instead of a strict bound, the ABE model requires only a bound on the expected message delay. While the conditions of ABD networks restrict the set of possible executions, in ABE networks all asynchronous executions are possible, but executions with extremely long delays are less probable. In contrast to ABD networks, ABE networks cannot be synchronised efficiently. At the example of an election algorithm, we show that the minimal assumptions of ABE networks are sufficient for the development of efficient algorithms. For anonymous, unidirectional ABE rings of known size N we devise a probabilistic leader election algorithm having average message and time complexity O(N).

  20. 笼型异步磁力耦合器机械特性与试验%Mechanical properties and testing for squirrel cage asynchronous magnetic coupler

    Institute of Scientific and Technical Information of China (English)

    葛研军; 袁直; 贾峰; 杨均悦; 周凯凯

    2016-01-01

    为有效解决目前机械传动系统中选用电机时功率裕度过大而普遍存在的能源利用效率较低问题,提出一种基于三相异步电机鼠笼转子的异步磁力耦合器(squirrel cage asynchronous magnetic coupler,SCAMC).结合SCAMC具体结构特点,采用标量磁位法及二维场边界条件,建立气隙磁场数理模型;在气隙磁通密度中引入时间变量,推导出感生电流随时间变化的表达式;基于电流叠加性,将笼条电流折算到转子表面,并沿圆周方向对感生电流所形成的洛伦兹力进行积分,建立了SCAMC的电磁转矩模型.基于上述理论及技术基础,设计并制造出一台37 kW SCAMC样机,并对其机械特性进行理论计算、仿真验证及试验测试.结果表明:转差率相同时,所得的仿真及试验数据与理论计算值相比,误差不超过5%;SCAMC与同容量的三相异步电机相比,线性工作区更宽,过载能力更强,但其机械特性偏软,可有效缓解负载对电机的冲击.该研究可为磁力耦合器在大惯量、难启动及经常性过载机械设备中的应用提供参考.%In order to effectively solve the problem of the motor's power margin too adequate to ensure the stable operation of the equipment which widely exists in the current mechanical transmission system, a kind of squirrel cage asynchronous magnetic coupler (SCAMC) is proposed based on the principle of three-phase asynchronous motor. The SCAMC has the advantages of the simplicity of mechanical structure, high reliability in successive operation, simple maintenance, weak skin effect of the squirrel cage rotor and adjustable slip ratio and so on. According to the specific characteristics of the SCAMC structure, the mathematical model of air gap magnetic flux density is established by using the scalar magnetic potential method and two-dimensional field boundary conditions. The air gap magnetic flux density generated by the permanent magnet in SCAMC can be decomposed into

  1. Usability Studies and User-Centered Design in Digital Libraries

    Science.gov (United States)

    Comeaux, David J.

    2008-01-01

    Digital libraries continue to flourish. At the same time, the principles of user-centered design and the practice of usability testing have been growing in popularity, spreading their influence into the library sphere. This article explores the confluence of these two trends by surveying the current literature on usability studies of digital…

  2. Usability and Children's Software: A User-Centered Design Methodology.

    Science.gov (United States)

    Robertson, Jenifer Wals

    1994-01-01

    Addresses usability issues pertaining to the purpose of educational software, followed by suggestions for ways in which educational software can meet the language, physical, social, and cognitive needs of children. Guidelines and recommendations are provided for adapting usability engineering and testing procedures to educational software to…

  3. The Usability-Error Ontology

    DEFF Research Database (Denmark)

    2013-01-01

    ability to do systematic reviews and meta-analyses. In an effort to support improved and more interoperable data capture regarding Usability Errors, we have created the Usability Error Ontology (UEO) as a classification method for representing knowledge regarding Usability Errors. We expect the UEO...... in patients coming to harm. Often the root cause analysis of these adverse events can be traced back to Usability Errors in the Health Information Technology (HIT) or its interaction with users. Interoperability of the documentation of HIT related Usability Errors in a consistent fashion can improve our...... will grow over time to support an increasing number of HIT system types. In this manuscript, we present this Ontology of Usability Error Types and specifically address Computerized Physician Order Entry (CPOE), Electronic Health Records (EHR) and Revenue Cycle HIT systems....

  4. Asymptotic behavior of asynchronous stochasticapproximation

    Institute of Scientific and Technical Information of China (English)

    方海涛; 陈翰馥

    2001-01-01

    The pathwise convergence of a distributed, asynchronous stochastic approximation (SA) scheme is analyzed. The conditions imposed on the step size and noise are the weakest in comparison with the existing ones. The step sizes in different processors are allowed to be different, and the time_delays between processors are also allowed to be different and even time_varying.

  5. Acquiring Knowledge from Asynchronous Discussion

    Science.gov (United States)

    Teo, Yiong Hwee; Webster, Len

    2008-01-01

    This article discusses a study which was designed to explore how online scaffolding can be incorporated to support knowledge acquisition in asynchronous discussion. A group of Singapore preservice teachers engaged in collaborative critiquing of videos before they embarked on their video projects to illustrate what constitutes good and bad video…

  6. Asynchronous sequential machine design and analysis

    CERN Document Server

    Tinder, Richard

    2009-01-01

    Asynchronous Sequential Machine Design and Analysis provides a lucid, in-depth treatment of asynchronous state machine design and analysis presented in two parts: Part I on the background fundamentals related to asynchronous sequential logic circuits generally, and Part II on self-timed systems, high-performance asynchronous programmable sequencers, and arbiters.Part I provides a detailed review of the background fundamentals for the design and analysis of asynchronous finite state machines (FSMs). Included are the basic models, use of fully documented state diagrams, and the design and charac

  7. Usability Evaluation Method for Agile Software Development

    Directory of Open Access Journals (Sweden)

    Saad Masood Butt

    2015-02-01

    Full Text Available Agile methods are the best fit for tremendously growing software industry due to its flexible and dynamic nature. But the software developed using agile methods do meet the usability standards? To answer this question we can see that majority of agile software development projects currently involve interactive user interface designs, which can only be possible by following User Centered Design (UCD in agile methods. The question here is, how to integrate UCD with agile models. Both Agile models and UCD are iterative in nature but agile models focus on coding and development of software; whereas, UCD focuses on user interface of the software. Similarly, both of them have testing features where the agile model involves automated tested code while UCD involves an expert or a user to test the user interface. In this paper, a new agile usability model is proposed and the evaluation is of the proposed model is presented by practically implementing it in three real life projects. . Key results from these projects clearly show: the proposed agile model incorporates usability evaluation methods, improves the relationship between usability experts to work with agile software experts; in addition, allows agile developers to incorporate the result from UCD into subsequent interactions.

  8. Usability evaluation of a locomotor therapy device considering different strategies

    Directory of Open Access Journals (Sweden)

    Langthaler Sonja

    2016-09-01

    Full Text Available Usability of medical devices is one of the main determining factors in preventing use errors in treatment and strongly correlates to patient safety and quality of treatment. This thesis demonstrates the usability testing and evaluation of a prototype for locomotor therapy of infants. Therefore, based on the normative requirements of the EN 62366, a concept combined of evaluation procedures and assessing methods was created to enable extensive testing and analysis of the different aspects of usability. On the basis of gathered information weak points were identified and appropriate measures were presented to increase the usability and operating safety of the locomotor prototype. The overall outcome showed an usability value of 77.4% and an evaluation score of 6.99, which can be interpreted as “satisfactory”.

  9. 软件可用性与美国工业可用性标准报告%Software Usability and the US Industry USability Reporting(IUSR)

    Institute of Scientific and Technical Information of China (English)

    李佳; 刘正捷; 李冠宇; 段建丽

    2001-01-01

    In the software product development,a special attention should be paid to the usability of the product while realizing its functionality. Usability pertains to the user's view of the quality of a pro-duct ,which is the synonym of the quality in use. It is one of the critical factors to the success of the pro-duct. In order to improve the usability of software products ,we must first make usability visible. Thus a kind of objective ,uniform and quantitative measurements for usability is in great need. The Common In-dustry Format for usability testing is a standardized test for software usability,which is also called CIF test for short. It is the main contribution of the IUSR project initiated by the US National Institute of Standards and Technology (NIST). The CIF Test is based on a carefully designed evaluation procedure and an appropriate metrics. It enables suppliers and purchasers of software products measure the usabil-ity of the products in an objective and quantitative way,therefore promote the emphasis on products'usability. After giving the concept of software usability,this paper describes the IUSR project and its main contribution-Common Industrial Format for usability testing. The authors' experiences in using the standard are discussed finally.

  10. Software architecture analysis of usability

    NARCIS (Netherlands)

    Folmer, E; van Gurp, J; Bosch, J; Bastide, R; Palanque, P; Roth, J

    2005-01-01

    Studies of software engineering projects show that a large number of usability related change requests are made after its deployment. Fixing usability problems during the later stages of development often proves to be costly, since many of the necessary changes require changes to the system that can

  11. Asynchronous control for networked systems

    CERN Document Server

    Rubio, Francisco; Bencomo, Sebastián

    2015-01-01

    This book sheds light on networked control systems; it describes different techniques for asynchronous control, moving away from the periodic actions of classical control, replacing them with state-based decisions and reducing the frequency with which communication between subsystems is required. The text focuses specially on event-based control. Split into two parts, Asynchronous Control for Networked Systems begins by addressing the problems of single-loop networked control systems, laying out various solutions which include two alternative model-based control schemes (anticipatory and predictive) and the use of H2/H∞ robust control to deal with network delays and packet losses. Results on self-triggering and send-on-delta sampling are presented to reduce the need for feedback in the loop. In Part II, the authors present solutions for distributed estimation and control. They deal first with reliable networks and then extend their results to scenarios in which delays and packet losses may occur. The novel ...

  12. GAMIFICATION IN ASYNCHRONOUS EDUCATION PROCESS

    Directory of Open Access Journals (Sweden)

    B. P. Dyakonov

    2016-01-01

    Full Text Available The author of the paper discourses on the prospects of education in the context of the global tendency towards informatization and virtualization of the modern world, influence of these processes on personalized senses of education and educational values and related problems of methodological and technological education in relation to the personalized meanings and educational values. Educational individualization is defined by the author as the most expected way of educational evolution. Distance learning is studied as the main example of the modern transformative educational model. Asynchronous education is explored and characterized as one of the distance learning examples. While defining what asynchronous distance learning is, the author explores its role in the specifics of forming a subject to subject educational approach, while forecasting difficulties in creating holistic asynchronous educational environment. Gamification techniques in the educational process are studied with their respective opportunities and threats, examples in grad and post grad professional studies are provided, including but not limited to foreign language studies. Addictiveness as the goal and means of a build in gamification process is explored as the way to bridge the gap between students and the educators. The author studies gamification in the context of minimizing negative connotations from the educational process, while controversies between pain and game approaches of getting knowledge are brought into light.

  13. Asynchronous Sensor fuSion for Improved Safety of air Traffic (ASSIST) Project

    Data.gov (United States)

    National Aeronautics and Space Administration — SSCI proposes to develop, implement and test a collision detection system for unmanned aerial vehicles (UAV), referred to as the Asynchronous Sensor fuSion for...

  14. Usability Study and Improvement of The Äly Excel

    OpenAIRE

    Tolonen, Heli

    2014-01-01

    This Master’s thesis concentrates on a particular tool, called Äly Excel, which is used in health care centres in Finland. The Äly Excel is a Microsoft Excel based tool that helps to plan a health care personnel rota. The main goal of this work was to enhance usability of the Äly Excel. The development work was part of the Hyvä Potku project that is managed by Northern Ostrobothnia Hospital District. To find out the most important usability problems of the Äly Excel, usability tests were...

  15. Abstracting Asynchronous Multi-Valued Networks: An Initial Investigation

    CERN Document Server

    Steggles, L Jason

    2011-01-01

    Multi-valued networks provide a simple yet expressive qualitative state based modelling approach for biological systems. In this paper we develop an abstraction theory for asynchronous multi-valued network models that allows the state space of a model to be reduced while preserving key properties of the model. The abstraction theory therefore provides a mechanism for coping with the state space explosion problem and supports the analysis and comparison of multi-valued networks. We take as our starting point the abstraction theory for synchronous multi-valued networks which is based on the finite set of traces that represent the behaviour of such a model. The problem with extending this approach to the asynchronous case is that we can now have an infinite set of traces associated with a model making a simple trace inclusion test infeasible. To address this we develop a decision procedure for checking asynchronous abstractions based on using the finite state graph of an asynchronous multi-valued network to reas...

  16. Problem Prioritization in Usability Evaluation:

    DEFF Research Database (Denmark)

    Hertzum, Morten

    2006-01-01

    Severity assessments enable prioritization of problems encountered during usability evaluations and thereby provide a device for guiding the utilization of design resources. However, designers' response to usability evaluations is also influenced by other factors, which may overshadow severity....... With the purpose of enhancing the impact of severity assessments, this study combines a field study of factors that influence the impact of evaluations with an experimental study of severity assessments made during usability inspections. The results show that even in a project receptive to input from evaluations...... their impact was highly dependent on conducting evaluations early. This accorded with an informal method that blended elements of usability evaluation and participatory design and could be extended with user-made severity assessments. The major cost associated with the evaluations was not finding but fixing...

  17. Usability in Finnish ICT industry

    OpenAIRE

    Toivanen, J.

    2015-01-01

    In today’s highly technological world there are devices for every occasion. That is why there is intense competition between developers who often create quite similar kinds of products. One of the multiple ways to stand out from the crowd is to have good usability in their products. By investing on usability companies can make their products better and that can improve their relationship with customers. The goal of this thesis was to find out how ICT organizations in Finland approach usab...

  18. Asynchronous τ-leaping

    Science.gov (United States)

    JÈ©drzejewski-Szmek, Zbigniew; Blackwell, Kim T.

    2016-03-01

    Stochastic simulation of cell signaling pathways and genetic regulatory networks has contributed to the understanding of cell function; however, investigation of larger, more complicated systems requires computationally efficient algorithms. τ-leaping methods, which improve efficiency when some molecules have high copy numbers, either use a fixed leap size, which does not adapt to changing state, or recalculate leap size at a heavy computational cost. We present a hybrid simulation method for reaction-diffusion systems which combines exact stochastic simulation and τ-leaping in a dynamic way. Putative times of events are stored in a priority queue, which reduces the cost of each step of the simulation. For every reaction and diffusion channel at each step of the simulation the more efficient of an exact stochastic event or a τ-leap is chosen. This new approach removes the inherent trade-off between speed and accuracy in stiff systems which was present in all τ-leaping methods by allowing each reaction channel to proceed at its own pace. Both directions of reversible reactions and diffusion are combined in a single event, allowing bigger leaps to be taken. This improves efficiency for systems near equilibrium where forward and backward events are approximately equally frequent. Comparison with existing algorithms and behaviour for five test cases of varying complexity shows that the new method is almost as accurate as exact stochastic simulation, scales well for large systems, and for various problems can be significantly faster than τ-leaping.

  19. Usability Briefing for hospital design

    DEFF Research Database (Denmark)

    Fronczek-Munter, Aneta

    This PhD thesis is a contribution to an ongoing debate in Denmark about improving the building design processes of complex buildings, especially in relation to the current hospital developments. It provides knowledge about capturing user needs and defines the process model for usability briefing ...... of complex buildings, such as hospitals. The research results have relevance to researchers, architects, facility managers and client organizations planning new complex facilities, and especially for professionals working with briefing and design of hospitals.......This PhD thesis is a contribution to an ongoing debate in Denmark about improving the building design processes of complex buildings, especially in relation to the current hospital developments. It provides knowledge about capturing user needs and defines the process model for usability briefing...... and evaluations, can be fed into briefing and design processes. This PhD thesis proposes methods for usability briefing.Usability is a concept similar to functionality, but usability depends on: subjective view of users, context, culture, situation and experience. Understanding usability is achieved by involving...

  20. The Electronic Patient Reported Outcome Tool: Testing Usability and Feasibility of a Mobile App and Portal to Support Care for Patients With Complex Chronic Disease and Disability in Primary Care Settings

    Science.gov (United States)

    Gill, Ashlinder; Khan, Anum Irfan; Hans, Parminder Kaur; Kuluski, Kerry; Cott, Cheryl

    2016-01-01

    Background People experiencing complex chronic disease and disability (CCDD) face some of the greatest challenges of any patient population. Primary care providers find it difficult to manage multiple discordant conditions and symptoms and often complex social challenges experienced by these patients. The electronic Patient Reported Outcome (ePRO) tool is designed to overcome some of these challenges by supporting goal-oriented primary care delivery. Using the tool, patients and providers collaboratively develop health care goals on a portal linked to a mobile device to help patients and providers track progress between visits. Objectives This study tested the usability and feasibility of adopting the ePRO tool into a single interdisciplinary primary health care practice in Toronto, Canada. The Fit between Individuals, Fask, and Technology (FITT) framework was used to guide our assessment and explore whether the ePRO tool is: (1) feasible for adoption in interdisciplinary primary health care practices and (2) usable from both the patient and provider perspectives. This usability pilot is part of a broader user-centered design development strategy. Methods A 4-week pilot study was conducted in which patients and providers used the ePRO tool to develop health-related goals, which patients then monitored using a mobile device. Patients and providers collaboratively set goals using the system during an initial visit and had at least 1 follow-up visit at the end of the pilot to discuss progress. Focus groups and interviews were conducted with patients and providers to capture usability and feasibility measures. Data from the ePRO system were extracted to provide information regarding tool usage. Results Six providers and 11 patients participated in the study; 3 patients dropped out mainly owing to health issues. The remaining 8 patients completed 210 monitoring protocols, equal to over 1300 questions, with patients often answering questions daily. Providers and patients

  1. Usability of Geographic Information: current challenges and future directions.

    Science.gov (United States)

    Brown, M; Sharples, S; Harding, J; Parker, C J; Bearman, N; Maguire, M; Forrest, D; Haklay, M; Jackson, M

    2013-11-01

    The use of Geographic Information or GI, has grown rapidly in recent years. Previous research has identified the importance of usability and user centred design in enabling the proliferation and exploitation of GI. However, the design and development of usable GI is not simply a matter of applying the tried and tested usability methods that have been developed for software and web design. Dealing with data and specifically GI brings with it a number of issues that change the way usability and user centred design can be applied. This paper describes the outcomes of a workshop held in March 2010 exploring the core issues relating to GI usability. The workshop brought together an international group of twenty experts in both human factors and GI, from a wide range of academic and industrial backgrounds. These experts considered three key issues, the stakeholders in GI, key challenges applying usability to GI and the usability methods that can be successfully applied to GI. The result of this workshop was to identify some areas for future research, such as the production of meaningful metadata and the implications of blurring of the line between data producers and data consumers.

  2. Adding SPICE to a Library Internet Site: A Recipe to Enhance Usability

    Directory of Open Access Journals (Sweden)

    Ingrid Tonnison

    2006-03-01

    Full Text Available Objective - To produce a highly- usable intranet site, use the project to explore the practical application of evidence-based librarianship (EBL, and refine the library's project management methodology. Methods - Evidence was gathered via a literature review, an online survey, scenario-based usability testing, and the completion of a usability checlist. Usability issues were then addressed, guided by the Research-Based Web Design and Usability Guidelines. Results - After a preliminary revision, the site achieved a usability index of 79% after application of the "Raward Library Usability Analysis Tool". Finding the information and supporting user tasks were identified as areas of weakness. Usability testing and cleint feedback supported these findings. After these issues were addressed by a major site redeveloment, the usability index increased to 98%. Conclusions - Raward's checklist is an easy and effective tool for measuring and identifying usability issues. Its value was enhanced by scenario-based usability testing, which yielded rich, client specific information. The application of EBL and project management princples ehnanced the outcomes of the project, and the professional development of the project team.

  3. Asynchronous Learning Forums for Business Acculturation

    Science.gov (United States)

    Pence, Christine Cope; Wulf, Catharina

    2009-01-01

    The use of IT as a facilitator for student collaboration in higher business education has grown rapidly since 2000. Asynchronous discussion forums are used abundantly for collaborative training purposes and for teaching students business-relevant tools for their future careers. This article presents an analysis of the asynchronous discussion forum…

  4. Usability of UX Methods in Agrarian Sector - Verification

    Directory of Open Access Journals (Sweden)

    P. Šimek

    2015-09-01

    Full Text Available The article deals with experimental verification of three distinct UX web application testing methods in areas of agriculture, food industry, forestry, water management and rural development. The verification was conducted using agrarian WWW portal AGRIS. The three analyzed methods were five-second test, thirty-second test and usability test with preset scenario. The usability test yielded best results. The results of thirty-second test were satisfactory while the five-second te st proved to be unsuitable for the given area.

  5. Early-Stage Software Design for Usability

    Science.gov (United States)

    Golden, Elspeth

    2010-01-01

    In spite of the goodwill and best efforts of software engineers and usability professionals, systems continue to be built and released with glaring usability flaws that are costly and difficult to fix after the system has been built. Although user interface (UI) designers, be they usability or design experts, communicate usability requirements to…

  6. Hello World! - Experiencing Usability Methods without Usability Expertise

    Science.gov (United States)

    Eriksson, Elina; Cajander, Åsa; Gulliksen, Jan

    How do you do usability work when no usability expertise is available? What happens in an organization when system developers, with no previous HCI knowledge, after a 3-day course, start applying usability methods, and particularly field studies? In order to answer these questions qualitative data were gathered through participatory observations, a feed back survey, field study documentation and interviews from 47 system developers from a public authority. Our results suggest that field studies enhance the developer’s understanding of the user perspective, and provide a more holistic overview of the use situation, but that some developers were unable to interpret their observations and see solutions to the users’ problems. The field study method was very much appreciated and has now become standard operating procedure within the organization. However, although field studies may be useful, it does not replace the need for usability pro fes sion als, as their knowledge is essential for more complex observations, analysis and for keeping the focus on usability.

  7. Universal asynchronous RSFQ gate for realization of Boolean functions of dual-rail binary variables

    Energy Technology Data Exchange (ETDEWEB)

    Dimov, B [University of Technology Ilmenau, Institute for Information Technology, PO Box 100565, D-98684 Ilmenau (Germany); Khabipov, M [Physikalisch-Technische Bundesanstalt, Division 2.42, Bundesallee 100, D-38116 Braunschweig (Germany); Balashov, D [Physikalisch-Technische Bundesanstalt, Division 2.42, Bundesallee 100, D-38116 Braunschweig (Germany); Brandt, C M [Physikalisch-Technische Bundesanstalt, Division 2.42, Bundesallee 100, D-38116 Braunschweig (Germany); Ortlepp, Th [University of Technology Ilmenau, Institute for Information Technology, PO Box 100565, D-98684 Ilmenau (Germany); Hagedorn, D [Physikalisch-Technische Bundesanstalt, Division 2.42, Bundesallee 100, D-38116 Braunschweig (Germany); Buchholz, F-Im [Physikalisch-Technische Bundesanstalt, Division 2.42, Bundesallee 100, D-38116 Braunschweig (Germany); Niemeyer, J [Physikalisch-Technische Bundesanstalt, Division 2.42, Bundesallee 100, D-38116 Braunschweig (Germany); Uhlmann, F H [University of Technology Ilmenau, Institute for Information Technology, PO Box 100565, D-98684 Ilmenau (Germany)

    2006-06-01

    We report on the design, optimization, fabrication, and successful testing of an universal asynchronous RSFQ logic gate based on the dual-rail data coding. Properly connecting its inputs and outputs, one can perform most of the basic Boolean functions over a pair of dual-rail input variables. Therefore, this gate is fundamental component for the development of high-speed complex asynchronous RSFQ digital devices.

  8. Direct Integration: Training Software Developers to Conduct Usability Evaluations

    DEFF Research Database (Denmark)

    Skov, Mikael B.; Stage, Jan

    2008-01-01

    is based on an empirical study where 36 teams with a total of 234 first-year university students on software development and design educations were trained in a simple approach for user-based website usability testing that was taught in a 40 hour course. This approach supported them in planning, conducting......Many improvements of the interplay between usability evaluation and software development rely either on better methods for conducting usability evaluations or on better formats for presenting evaluation results in ways that are useful for software designers and developers. Both approaches involve...... a complete division of work between developers and evaluators, which is an undesirable complexity for many software development projects. This paper takes a different approach by exploring to what extent software developers and designers can be trained to carry out their own usability evaluations. The paper...

  9. 异步电机定子叠频法温升试验及效率研究综述%Overview on asynchronous motor temperature rise testing and efficiency evaluation by method of stator mixed-frequency equivalent loading

    Institute of Scientific and Technical Information of China (English)

    王伟光; 陈卫杰; 李伟; 梁艳萍; 李藏雪

    2016-01-01

    Large power vertical asynchronous motor is hard to find a proper coupler or load. So, temperature rise test should be simulated by equivalent loading using stator mixed⁃frequency method, i. e. , to superpose the primary and the secondary power supply vectors with similar frequency thus to form a new beat frequency power supply which should be applied at the terminal of the motor. The air⁃gap magnetic field generates pulse oscillation near the synchronous speed making the rotor of the asynchronous motor have a frequent status switching at generator and mo⁃tor. The moment of inertia of the rotor is changed, which excites electrical current flowing to the motor winding, and from the viewpoint of motor loss, it corresponds to introducing an equivalent mechanical loading. In this paper, the variation rules for the loss of the asynchronous motor, the estimated error for the efficiency and temperature rise at mixed⁃frequency are discussed, at mixed frequency, the temperature rise increases by 2~6K, and the efficiency decreases by 0�5 to 1 percent. With a deepening understanding of mixed⁃frequency, this will give a hint to the e⁃lectromagnetism design, ventilation calculation and lubrication calculation of sliding bearing. The feasibility of the mixed⁃frequency test of water lubricated thrust bearing is put forward. At present, our mixed⁃frequency technology is still at the developing period, and the aim is by referring to latest motor standard from IEEE112⁃B of the U. S. , the JEC⁃2137 of Japan, AS/NS1359�5 of Australia and IEC34⁃2 of EU, to improve related part of the mixed fre⁃quency test of our GB/T1032 in detail. Finally, the existing problems in the mixed⁃frequency method and the fu⁃ture study aspects are discussed in the paper.%大功率及立式异步电机难以找到恰当的对拖机组或负载,需要通过定子叠频等效负载法来模拟温升试验,即将两种相近频率主、副电源矢量叠加形成新的拍频

  10. Usability in a cultural context

    DEFF Research Database (Denmark)

    Madsen, Sabine; Nielsen, Lene

    2010-01-01

    This paper focuses on presenting and discussing the aim, context, challenges, results, and impact of the Cultural usability project named as CultUsab. This project was a four year international research effort from 2006 to 2009, which was supported by a grant for the Danish Research Councils for ...... for Independent Research in Culture and Communication. The project aimed at innovating processes in Information and Communication Technology development through an understanding of culturally sensitive aspects of usability evaluation methods.......This paper focuses on presenting and discussing the aim, context, challenges, results, and impact of the Cultural usability project named as CultUsab. This project was a four year international research effort from 2006 to 2009, which was supported by a grant for the Danish Research Councils...

  11. Low-power Implementation of an Encryption/Decryption System with Asynchronous Techniques

    Directory of Open Access Journals (Sweden)

    Nikos Sklavos

    2002-01-01

    Full Text Available An asynchronous VLSI implementation of the International Data Encryption Algorithm (IDEA is presented in this paper. In order to evaluate the asynchronous design a synchronous version of the algorithm was also designed. VHDL hardware description language was used in order to describe the algorithm. By using Synopsys commercial available tools the VHDL code was synthesized. After placing and routing both designs were fabricated with 0.6 μm CMOS technology. With a system clock of up to 8 MHz and a power supply of 5 V the two chips were tested and evaluated comparing with the software implementation of the IDEA algorithm. This new approach proves efficiently the lowest power consumption of the asynchronous implementation compared to the existing synchronous. Therefore, the asynchronous chip performs efficiently in Wireless Encryption Protocols and high speed networks.

  12. Cultural Cognition in Usability Evaluation

    DEFF Research Database (Denmark)

    Clemmensen, Torkil; Hertzum, Morten; Hornbæk, Kasper Anders Søren

    2009-01-01

    We discuss the impact of cultural differences on usability evaluations that are based on the thinking-aloud method (TA). The term ‘cultural differences’ helps distinguish differences in the perception and thinking of Westerners (people from Western Europe and US citizens with European origins...... and evaluator. In conclusion, we point to the importance of matching the task presentation to users’ cultural background, the different effects of thinking aloud on task performance between Easterners and Westerners, the differences in nonverbal behaviour that affect usability problem detection, and, finally...

  13. Asynchronous design of Networks-on-Chip

    DEFF Research Database (Denmark)

    Sparsø, Jens

    2007-01-01

    The Network-on-chip concept has evolved as a solution to a broad range of problems related to the design of complex systems-on-chip (SoC) with tenths or hundreds of (heterogeneous) IP-cores. The paper introduces the NoC concept, identifies a range of possible timing organizations (globally......-synchronous, mesochronous, globally-asynchronous locally-synchronous and fully asynchronous), discusses the circuitry needed to implement these timing methodologies, and provides some implementation details for a couple of asynchronous NoCs designed at the Technical University of Denmark (DTU). The paper is written...

  14. Burst-Mode Asynchronous Controllers on FPGA

    Directory of Open Access Journals (Sweden)

    Duarte L. Oliveira

    2008-01-01

    Full Text Available FPGAs have been mainly used to design synchronous circuits. Asynchronous design on FPGAs is difficult because the resulting circuit may suffer from hazard problems. We propose a method that implements a popular class of asynchronous circuits, known as burst mode, on FPGAs based on look-up table architectures. We present two conditions that, if satisfied, guarantee essential hazard-free implementation on any LUT-based FPGA. By doing that, besides all the intrinsic advantages of asynchronous over synchronous circuits, they also take advantage of the shorter design time and lower cost associated with FPGA designs.

  15. Evaluating the Usability of Optimizing Text-based CAPTCHA Generation

    Directory of Open Access Journals (Sweden)

    Suliman A. Alsuhibany

    2016-08-01

    Full Text Available A CAPTCHA is a test that can, automatically, tell human and computer programs apart. It is a mechanism widely used nowadays for protecting web applications, interfaces, and services from malicious users and automated spammers. Usability and robustness are two fundamental aspects with CAPTCHA, where the usability aspect is the ease with which humans pass its challenges, while the robustness is the strength of its segmentation-resistance mechanism. The collapsing mechanism, which is removing the space between characters to prevent segmentation, has been shown to be reasonably resistant to known attacks. On the other hand, this mechanism drops considerably the human-solvability of text-based CAPTCHAs. Accordingly, an optimizer has previously been proposed that automatically enhances the usability of a CAPTCHA generation without sacrificing its robustness level. However, this optimizer has not yet been evaluated in terms of improving the usability. This paper, therefore, evaluates the usability of this optimizer by conducting an experimental study. The results of this evaluation showed that a statistically significant enhancement is found in the usability of text-based CAPTCHA generation.

  16. Usability engineering for mobile maps

    NARCIS (Netherlands)

    Looije, R.; Brake, G.M. te; Neerincx, M.A.

    2007-01-01

    because interaction with these maps can be laborious the applications are often hard to use. Therefore, the usability of maps on mobile devices must be improved. In this paper we review the research that has been done to solve technical, environmental, and social challenges of mobile map use. We wil

  17. Improving Usability of Passphrase Authentication

    DEFF Research Database (Denmark)

    Nielsen, Glen; Vedel, Michael; Jensen, Christian D.

    2014-01-01

    . This is done to ensure an appropriate degree of security, but instead, it makes it difficult for users to remember their password, which results in passwords that are either insecure, but easy to remember, or written down on paper. In this paper we address the problem of usability in user authentication...

  18. Asynchronous networks and event driven dynamics

    Science.gov (United States)

    Bick, Christian; Field, Michael

    2017-02-01

    Real-world networks in technology, engineering and biology often exhibit dynamics that cannot be adequately reproduced using network models given by smooth dynamical systems and a fixed network topology. Asynchronous networks give a theoretical and conceptual framework for the study of network dynamics where nodes can evolve independently of one another, be constrained, stop, and later restart, and where the interaction between different components of the network may depend on time, state, and stochastic effects. This framework is sufficiently general to encompass a wide range of applications ranging from engineering to neuroscience. Typically, dynamics is piecewise smooth and there are relationships with Filippov systems. In this paper, we give examples of asynchronous networks, and describe the basic formalism and structure. In the following companion paper, we make the notion of a functional asynchronous network rigorous, discuss the phenomenon of dynamical locks, and present a foundational result on the spatiotemporal factorization of the dynamics for a large class of functional asynchronous networks.

  19. Asynchronous stochastic approximation with differential inclusions

    Directory of Open Access Journals (Sweden)

    David S. Leslie

    2012-01-01

    Full Text Available The asymptotic pseudo-trajectory approach to stochastic approximation of Benaïm, Hofbauer and Sorin is extended for asynchronous stochastic approximations with a set-valued mean field. The asynchronicity of the process is incorporated into the mean field to produce convergence results which remain similar to those of an equivalent synchronous process. In addition, this allows many of the restrictive assumptions previously associated with asynchronous stochastic approximation to be removed. The framework is extended for a coupled asynchronous stochastic approximation process with set-valued mean fields. Two-timescales arguments are used here in a similar manner to the original work in this area by Borkar. The applicability of this approach is demonstrated through learning in a Markov decision process.

  20. Lessons from an Educational Game Usability Evaluation

    Directory of Open Access Journals (Sweden)

    Gabriela Trindade Perry

    2012-04-01

    Full Text Available In this paper, we present the results of a usability evaluation for Xenubi, a cell phone game about the periodic table. We describe and discuss the issues that we faced during the evaluation, which took place in a state high school. These issues are related to conflicts between the data that were gathered through video recordings and through a questionnaire. We also point to the poor performance of the game mechanics during the evaluation. This result was unexpected because the game had an excellent performance in the pilot test. Possible causes for these differences are discussed.

  1. Strategies to design for dynamic usability

    NARCIS (Netherlands)

    Bijl-Brouwer, van der Mieke; Voort, van der Mascha

    2009-01-01

    Since usability is a property of the interaction between a product, a user and the task that he or she is trying to complete [6], a product’s usability can vary when it is used in varying use situations. We define this as dynamic usability. This study is aimed at exploring how practitioners currentl

  2. Assessment of the Usability of the Workbench Faraday Cage Method

    DEFF Research Database (Denmark)

    Sørensen, Morten; Franek, Ondrej; Christensen, Søren K.

    2011-01-01

    The workbench Faraday Cage method (WBFC) is a time efficient module pre-compliance test regarding radiated emission. This work investigates the method’s usability and credibility and concludes that for this particular case the WBFC perform a tolerable compliance test for frequencies below 360 MHz...

  3. Commande adaptive d'une machine asynchrone

    Science.gov (United States)

    Slama-Belkhodja, I.; de Fornel, B.

    1996-06-01

    The paper deals with an indirect self-tuning speed control for an induction motor supplied by a chopper-filter-inverter system. Input/Output models are identified with the recursive least squares algorithm and the controller adaptation is based on a pole assignement strategy. Emphasis is put on the evaluation of the parameter identification in order to avoid instabilities because of disturbances or insufficient excitations. This is especially of importance when the adaptive control is carried out in closed loop systems and without additional test signals. Simulation results show the improvement of the dynamic responses and the robustness against load variations or parameters variations (rotor resistance, inertia). Cat article décrit une stratégie de commande adaptive indirecte à Placement de Pôles (PP), appliquée à la commande en vitesse d'une machine asynchrone alimentée par un ensemble hacheur-filtre-onduleur de tension. L'algorithme des Moindres Carrés Récursifs (MCR) est utilisé pour l'identification des modèles de comportement type entrées/sorties. Un intérêt particulier est porté à la mise en oeuvre de cet algorithme et à la discussion de ses résultats, tenant compte des erreurs de modélisation et de la nature peu riche en excitations des entrées du processus. Différents régimes transitoires ont été simulés pour apprécier l'apport de cette association (MCR-PP) : démarrages et inversion des sens de rotation, à vide et en charges, applications d'échelons de couple résistant, variations paramétriques. Les résultats permettent d'illustrer, tant au niveau des performances que de la robustesse, l'apport d'une telle commande adaptive pour des entraînements électriques avec une machine asynchrone.

  4. Design of a tablet computer app for facilitation of a molecular blood culture test in clinical microbiology and preliminary usability evaluation

    DEFF Research Database (Denmark)

    Samson, Lasse L.; Pape-Haugaard, Louise; Meltzer, Michelle C.

    2016-01-01

    BACKGROUND: User mobility is an important aspect of the development of clinical information systems for health care professionals. Mobile phones and tablet computers have obtained widespread use by health care professionals, offering an opportunity for supporting the access to patient information...... through specialized applications (apps) while supporting the mobility of the users. The use of apps for mobile phones and tablet computers may support workflow of complex tasks, for example, molecular-based diagnostic tests in clinical microbiology. Multiplex Blood Culture Test (MuxBCT) is a molecular...... of microorganisms from positive blood culture samples. The study participants were observed, and their interactions with the app were recorded. After the study, the participants were debriefed to clarify observations. RESULTS: Four medical laboratory technicians, for example, representative of end users of the app...

  5. Facilitating Energy Savings through Enhanced Usability of Thermostats

    Energy Technology Data Exchange (ETDEWEB)

    Meier, Alan; Aragon, Cecilia; Peffer, Therese; Perry, Daniel; Pritoni, Marco

    2011-05-23

    Residential thermostats play a key role in controlling heating and cooling systems. Occupants often find the controls of programmable thermostats confusing, sometimes leading to higher heating consumption than when the buildings are controlled manually. A high degree of usability is vital to a programmable thermostat's effectiveness because, unlike a more efficient heating system, occupants must engage in specific actions after installation to obtain energy savings. We developed a procedure for measuring the usability of thermostats and tested this methodology with 31 subjects on five thermostats. The procedure requires first identifying representative tasks associated with the device and then testing the subjects ability to accomplish those tasks. The procedure was able to demonstrate the subjects wide ability to accomplish tasks and the influence of a device's usability on success rates. A metric based on the time to accomplish the tasks and the fraction of subjects actually completing the tasks captured the key aspects of each thermostat's usability. The procedure was recently adopted by the Energy Star Program for its thermostat specification. The approach appears suitable for quantifying usability of controls in other products, such as heat pump water heaters and commercial lighting.

  6. THE USE OF EYE TRACKING TO ASSESS THE USABILITY OF UNIVERSITY WEBSITE

    Directory of Open Access Journals (Sweden)

    Terézia Kvasnicová

    2015-09-01

    Full Text Available Websites, nowadays, are used not only as a sales method and information tool, but also as a communication tool. Almost every company has a website. Universities and colleges understand their strength, too. In this article, we describe theory of usability of university website and one of the usability testing methods—eye tracking. We use eye tracking to assess the usability of University of Žilina website. We present and use different analysis: Scan Path and Focus map. We identify many usability problems whose removal will help to create new pages and, thus, increasing their effectiveness.

  7. Understanding Usability Work as a Human Activity

    DEFF Research Database (Denmark)

    Nørgaard, Mie

    Three core themes are explored in eight papers: Usability work as a human activity, usability practice and methods, and persuasiveness of evaluation results and feedback. We explore how usability work is much more than methods and work procedures, and argue that maturing our understanding...... systems struggle with making methods meet practical realities and demands, and that the concept of usability in games is not satisfactorily covered by for example the ISO 9241-11. With this in mind we call for future work that broadens the concept of usability to include concepts more relevant to games...... of usability work to include a human perspective, is crucial to downstream utility—how usability work impacts the on-going development process. Our work shows that cross-professional collaboration is subject to challenges that arise from stakeholders having conflicting priorities, procedures and personalities...

  8. Software Development and Feedback from Usability Evaluations

    DEFF Research Database (Denmark)

    Høegh, Rune Thaarup

    2008-01-01

    This paper presents a study of the strengths and weaknesses of written, multimedia and oral feedback from usability evaluations to developers. The strengths and weaknesses are related to how well the feedback supports the developers in addressing usability problems in a software system. The study...... of information, while still not offering the required information to address usability problems. Other forms of feedback, such as oral or multimedia feedback helps the developer in understanding the usability problems better, but are on the other hand less cost-effective than a written description....... concludes that using the traditional written usability report, as the only form of feedback from usability evaluations is associated with problems related to the report not supporting the process of addressing the usability problems. The report is criticized for representing an overwhelming amount...

  9. The Usability Analysis of An E-Learning Environment

    Directory of Open Access Journals (Sweden)

    Fulya TORUN

    2015-10-01

    Full Text Available In this research, an E-learning environment is developed for the teacher candidates taking the course on Scientific Research Methods. The course contents were adapted to one of the constructivist approach models referred to as 5E, and an expert opinion was received for the compliance of this model. An usability analysis was also performed to determine the usability of the e-learning environment. The participants of the research comprised 42 teacher candidates. The mixed method was used in the research. 3 different data collection tools were used in order to measure the three basic concepts of usability analyses, which are the dimensions of effectiveness, efficiency and satisfaction. Two of the data collection tools were the scales developed by different researchers and were applied with the approval received from the researchers involved. On the other hand, the usability test as another data tool was prepared by the researchers who conducted this study for the purpose of determining the participants’ success in handling the twelve tasks assigned to them with respect to the use of elearning environment, the seconds they spent on that environment and the number of clicks they performed. Considering the results of the analyses performed within the data obtained, the usability of the developed e-learning environment proved to be at a higher rate.

  10. Usability principles to design mobile workplace learning content

    Directory of Open Access Journals (Sweden)

    Alessia Messuti

    2015-04-01

    Full Text Available The article describes the design of a mobile workplace learning tool for trainers of the International Training Centre of the International Labour Organization. The motivation behind is to provide trainers with a practical tool that will enable them to recall information at the moment of need and continue to learn in context. On this purpose a set of visual augmented reality cards was created, taking into consideration the fundamental mobile learning and usability principles. The nature of the article is empirical as it reports an experiment carried out with trainers which aimed at testing cards usability and learnability. Results show that the integration of both online and offline strategies was perceived as an added value as trainers could choose to retrieve information as they mostly like; finally, it also resulted in high usability scores, an aspect that contributes to their effectiveness at the workplace.

  11. Usability Briefing - a process model for healthcare facilities

    DEFF Research Database (Denmark)

    Fronczek-Munter, Aneta

    2014-01-01

    and the purpose is to develop a process model for applying it on complex building projects. Usability briefing is a process in which users are actively involved, not only in evaluations and data gathering, but also in a continuous briefing process with focus on usability. Approach: The model is inductively...... developed from a literature review and three case studies at hospitals in Denmark and Norway. With the aim of connecting to practice, the steps in the model are based on RIBA’s planning phases from 2013. Results/ Originality: The paper presents an integrated usability briefing process model for continuous...... to be applied and further tested. Because of the empirical results, the explanation of the process model focuses mostly phase 1 and 2 of the RIBA planning model....

  12. A Usability Study of Users' Perceptions toward a Multimedia Computer-Assisted Learning Tool for Neuroanatomy

    Science.gov (United States)

    Gould, Douglas J.; Terrell, Mark A.; Fleming, Jo

    2008-01-01

    This usability study evaluated users' perceptions of a multimedia prototype for a new e-learning tool: Anatomy of the Central Nervous System: A Multimedia Course. Usability testing is a collection of formative evaluation methods that inform the developmental design of e-learning tools to maximize user acceptance, satisfaction, and adoption.…

  13. Design and validation of a questionnaire to evaluate the usability of computerized critical care information systems.

    Science.gov (United States)

    von Dincklage, Falk; Lichtner, Gregor; Suchodolski, Klaudiusz; Ragaller, Maximilian; Friesdorf, Wolfgang; Podtschaske, Beatrice

    2016-06-03

    The implementation of computerized critical care information systems (CCIS) can improve the quality of clinical care and staff satisfaction, but also holds risks of disrupting the workflow with consecutive negative impacts. The usability of CCIS is one of the key factors determining their benefits and weaknesses. However, no tailored instrument exists to measure the usability of such systems. Therefore, the aim of this study was to design and validate a questionnaire that measures the usability of CCIS. Following a mixed-method design approach, we developed a questionnaire comprising two evaluation models to assess the usability of CCIS: (1) the task-specific model rates the usability individually for several tasks which CCIS could support and which we derived by analyzing work processes in the ICU; (2) the characteristic-specific model rates the different aspects of the usability, as defined by the international standard "ergonomics of human-system interaction". We tested validity and reliability of the digital version of the questionnaire in a sample population. In the sample population of 535 participants both usability evaluation models showed a strong correlation with the overall rating of the system (multiple correlation coefficients ≥0.80) as well as a very high internal consistency (Cronbach's alpha ≥0.93). The novel questionnaire is a valid and reliable instrument to measure the usability of CCIS and can be used to study the influence of the usability on their implementation benefits and weaknesses.

  14. Algoritmo de um teste adaptativo informatizado com base na teoria da resposta ao item para a estimação da usabilidade de sites de e-commerce Algorithm of computerized adaptive testing to estimate the usability of e-commerce sites

    Directory of Open Access Journals (Sweden)

    Fernando de Jesus Moreira Junior

    2012-01-01

    Full Text Available O presente artigo propõe um algoritmo de um teste adaptativo informatizado baseado na teoria da resposta ao item, desenvolvido para estimar o grau de usabilidade de sites de e-commerce. Cinco algoritmos baseados no critério da máxima informação foram desenvolvidos e testados via simulação. O algoritmo com o melhor desempenho foi aplicado nos dados reais de 361 sites de e-commerce. Os resultados mostraram que o algoritmo desenvolvido consegue obter uma boa estimativa para o grau de usabilidade de sites de e-commerce com a aplicação de 13 itens.This paper proposes an algorithm of a computerized adaptive testing based on Item Response Theory, designed to estimate the degree of usability of e-commerce sites. Five algorithms were tested by simulation. The algorithm with the best performance was applied to real data from 361 e-commerce sites. The results showed that the algorithm could obtain good estimates for the degree of usability of e-commerce sites with the application of 13 items.

  15. Handbook of asynchronous machines with variable speed

    CERN Document Server

    Razik, Hubert

    2013-01-01

    This handbook deals with the asynchronous machine in its close environment. It was born from a reflection on this electromagnetic converter whose integration in industrial environments takes a wide part. Previously this type of motor operated at fixed speed, from now on it has been integrated more and more in processes at variable speed. For this reason it seemed useful, or necessary, to write a handbook on the various aspects from the motor in itself, via the control and while finishing by the diagnosis aspect. Indeed, an asynchronous motor is used nowadays in industry where variation speed a

  16. A Provably Secure Asynchronous Proactive RSA Scheme

    Institute of Scientific and Technical Information of China (English)

    ZHANG Rui-shan; LI Qiang; CHEN Ke-fei

    2005-01-01

    The drawback of the first asynchronous proactive RSA scheme presented by Zhou in 2001, is that the se curity definition and security proof do not follow the approach of provable security. This paper presented a provably secure asynchronous proactive RSA scheme, which includes three protocols: initial key distribution protocol,signature generation protocol and share refreshing protocol. Taken these protocols together, a complete provably secure proactive RSA scheme was obtained. And the efficiency of the scheme is approximate to that of the scheme of Zhou.

  17. Processor arrays with asynchronous TDM optical buses

    Science.gov (United States)

    Li, Y.; Zheng, S. Q.

    1997-04-01

    We propose a pipelined asynchronous time division multiplexing optical bus. Such a bus can use one of the two hardwared priority schemes, the linear priority scheme and the round-robin priority scheme. Our simulation results show that the performances of our proposed buses are significantly better than the performances of known pipelined synchronous time division multiplexing optical buses. We also propose a class of processor arrays connected by pipelined asynchronous time division multiplexing optical buses. We claim that our proposed processor array not only have better performance, but also have better scalabilities than the existing processor arrays connected by pipelined synchronous time division multiplexing optical buses.

  18. Synchronization of Asynchronous Switched Boolean Network.

    Science.gov (United States)

    Zhang, Hao; Wang, Xingyuan; Lin, Xiaohui

    2015-01-01

    In this paper, the complete synchronizations for asynchronous switched Boolean network with free Boolean sequence controllers and close-loop controllers are studied. First, the basic asynchronous switched Boolean network model is provided. With the method of semi-tensor product, the Boolean dynamics is translated into linear representation. Second, necessary and sufficient conditions for ASBN synchronization with free Boolean sequence control and close-loop control are derived, respectively. Third, some illustrative examples are provided to show the efficiency of the proposed methods.

  19. A simple asynchronous replica-exchange implementation

    CERN Document Server

    Bussi, Giovanni

    2008-01-01

    We discuss the possibility of implementing asynchronous replica-exchange (or parallel tempering) molecular dynamics. In our scheme, the exchange attempts are driven by asynchronous messages sent by one of the computing nodes, so that different replicas are allowed to perform a different number of time-steps between subsequent attempts. The implementation is simple and based on the message-passing interface (MPI). We illustrate the advantages of our scheme with respect to the standard synchronous algorithm and we benchmark it for a model Lennard-Jones liquid on an IBM-LS21 blade center cluster.

  20. Asynchronous parallel generating set search for linearly-constrained optimization.

    Energy Technology Data Exchange (ETDEWEB)

    Kolda, Tamara G.; Griffin, Joshua; Lewis, Robert Michael

    2007-04-01

    We describe an asynchronous parallel derivative-free algorithm for linearly-constrained optimization. Generating set search (GSS) is the basis of ourmethod. At each iteration, a GSS algorithm computes a set of search directionsand corresponding trial points and then evaluates the objective function valueat each trial point. Asynchronous versions of the algorithm have been developedin the unconstrained and bound-constrained cases which allow the iterations tocontinue (and new trial points to be generated and evaluated) as soon as anyother trial point completes. This enables better utilization of parallel resourcesand a reduction in overall runtime, especially for problems where the objec-tive function takes minutes or hours to compute. For linearly-constrained GSS,the convergence theory requires that the set of search directions conform to the3 nearby boundary. The complexity of developing the asynchronous algorithm forthe linearly-constrained case has to do with maintaining a suitable set of searchdirections as the search progresses and is the focus of this research. We describeour implementation in detail, including how to avoid function evaluations bycaching function values and using approximate look-ups. We test our imple-mentation on every CUTEr test problem with general linear constraints and upto 1000 variables. Without tuning to individual problems, our implementationwas able to solve 95% of the test problems with 10 or fewer variables, 75%of the problems with 11-100 variables, and nearly half of the problems with100-1000 variables. To the best of our knowledge, these are the best resultsthat have ever been achieved with a derivative-free method. Our asynchronousparallel implementation is freely available as part of the APPSPACK software.4

  1. Cultural Cognition in Usability Evaluation

    DEFF Research Database (Denmark)

    Clemmensen, Torkil; Hertzum, Morten; Hornbæk, Kasper Anders Søren

    2009-01-01

    ) and Easterners (people from China and the countries heavily influenced by its culture). We illustrate the impact of cultural cognition on four central elements of TA: (1) instructions and tasks, (2) the user's verbalizations, (3) the evaluator's reading of the user, and (4) the overall relationship between user...... and evaluator. In conclusion, we point to the importance of matching the task presentation to users' cultural background, the different effects of thinking aloud on task performance between Easterners and Westerners, the differences in nonverbal behaviour that affect usability problem detection, and, finally......, the complexity of the overall relationship between a user and an evaluator with different cultural backgrounds...

  2. Defining Usability of PN Services

    DEFF Research Database (Denmark)

    Nicolajsen, Hanne Westh; Ahola, Titta; Fleury, Alexandre

    with the MAGNET Beyond system, as well as the core concepts: Personal Network, Personal Network-Federation, Service Discovery, User Profile Management, Personal Network Management, Privacy and Security and Context Awareness. The overall plans for the final usability evaluation are documented based on the present...... status of the pilot services. The evaluation will be conducted on two pilot services, that are being implemented - the Lifestyle companion and the Icebreaker. The plan of the evaluation is to carry out combinations of different types of user evaluation methods. These are user panel workshops, situated...

  3. Approaching usability: a study of an academic health sciences library web site.

    Science.gov (United States)

    Ascher, Marie T; Lougee-Heimer, Haldor; Cunningham, Diana J

    2007-01-01

    A usability study was conducted at a medium-sized academic health sciences library with the goal of providing data to inform the future redesign of the library's Web page. A two-stage approach was used: (1) A preliminary survey designed to identify common tasks and issues on which to focus, and (2) usability testing. Responses to the survey indicated general satisfaction with the site and suggested areas for testing. Usability testing participants were asked to perform scripted tasks. The results indicate that users do have considerable difficulty navigating the site and recommendations are presented. This method of testing is recommended for health sciences libraries.

  4. Usability in open source software development

    DEFF Research Database (Denmark)

    Andreasen, M. S.; Nielsen, H. V.; Schrøder, S. O.

    2006-01-01

    Open Source Software (OSS) development has gained significant importance in the production of soft-ware products. Open Source Software developers have produced systems with a functionality that is competitive with similar proprietary software developed by commercial software organizations. Yet OSS...... is usually designed for and by power-users, and OSS products have been criticized for having little or no emphasis on usability. We have conducted an empirical study of the developers’ opinions about usability and the way usability engineering is practiced in a variety of OSS projects. The study included...... a questionnaire survey and a series of interviews, where we interviewed OSS contributors with both technical and usability backgrounds. Overall we found that OSS developers are interested in usability, but in practice it is not top priority, and OSS projects rarely employs systematic usability evaluation. Most...

  5. Distributed user interfaces usability and collaboration

    CERN Document Server

    Lozano, María D; Tesoriero, Ricardo; Penichet, Victor MR

    2013-01-01

    Written by international researchers in the field of Distributed User Interfaces (DUIs), this book brings together important contributions regarding collaboration and usability in Distributed User Interface settings. Throughout the thirteen chapters authors address key questions concerning how collaboration can be improved by using DUIs, including: in which situations a DUI is suitable to ease the collaboration among users; how usability standards can be used to evaluate the usability of systems based on DUIs; and accurately describe case studies and prototypes implementing these concerns

  6. Usability and User Experience Information in Reviews

    DEFF Research Database (Denmark)

    Hedegaard, Steffen

    future versions of the prod- uct? The results show that users write about product use in terms related to standard and popularly researched aspects of usability and user experience, e.g. effiiency, effectiveness, enjoyment, frustration. The frequency with which different aspects are depicted in reviews...... differs significantly between product domains. We also find that reviews contain descriptions of more persistent usability issues. I devise automatic methods for classifying sentences with regard to dimensions of both usability and user experience and usability problems and perform a linguistic analysis...

  7. Usable security history, themes, and challenges

    CERN Document Server

    Garfinkel, Simson

    2014-01-01

    There has been roughly 15 years of research into approaches for aligning research in Human Computer Interaction with computer Security, more colloquially known as ``usable security.'' Although usability and security were once thought to be inherently antagonistic, today there is wide consensus that systems that are not usable will inevitably suffer security failures when they are deployed into the real world. Only by simultaneously addressing both usability and security concerns will we be able to build systems that are truly secure. This book presents the historical context of the work to dat

  8. From Usability Engineering to Evidence-based Usability in Health IT.

    Science.gov (United States)

    Marcilly, Romaric; Peute, Linda; Beuscart-Zephir, Marie-Catherine

    2016-01-01

    Usability is a critical factor in the acceptance, safe use, and success of health IT. The User-Centred Design process is widely promoted to improve usability. However, this traditional case by case approach that is rooted in the sound understanding of users' needs is not sufficient to improve technologies' usability and prevent usability-induced use-errors that may harm patients. It should be enriched with empirical evidence. This evidence is on design elements (what are the most valuable design principles, and the worst usability mistakes), and on the usability evaluation methods (which combination of methods is most suitable in which context). To achieve this evidence, several steps must be fulfilled and challenges must be overcome. Some attempts to search evidence for designing elements of health IT and for usability evaluation methods exist and are summarized. A concrete instance of evidence-based usability design principles for medication-related alerting systems is briefly described.

  9. Asynchronous Rumor Spreading on Random Graphs

    CERN Document Server

    Panagiotou, Konstantinos

    2016-01-01

    We perform a thorough study of various characteristics of the asynchronous push-pull protocol for spreading a rumor on Erd\\H{o}s-R\\'enyi random graphs $G_{n,p}$, for any $p>c\\ln(n)/n$ with $c>1$. In particular, we provide a simple strategy for analyzing the asynchronous push-pull protocol on arbitrary graph topologies and apply this strategy to $G_{n,p}$. We prove tight bounds of logarithmic order for the total time that is needed until the information has spread to all nodes. Surprisingly, the time required by the asynchronous push-pull protocol is asymptotically almost unaffected by the average degree of the graph. Similarly tight bounds for Erd\\H{o}s-R\\'enyi random graphs have previously only been obtained for the synchronous push protocol, where it has been observed that the total running time increases significantly for sparse random graphs. Finally, we quantify the robustness of the protocol with respect to transmission and node failures. Our analysis suggests that the asynchronous protocols are particu...

  10. Asynchronous ASCII Event Count Status Code

    Science.gov (United States)

    2012-03-01

    IRIG STANDARD 215-12 TELECOMMUNICATIONS AND TIMING GROUP ASYNCHRONOUS ASCII EVENT COUNT STATUS CODES...Inter-range Instrumentation Group ( IRIG ) Standard for American Standard Code for Information Interchange (ASCII)-formatted EC status transfer which can be...circuits and Ethernet networks. Provides systems engineers and equipment vendors with an Inter-range Instrumentation Group ( IRIG ) Standard for American

  11. Asynchronous stream processing with S-Net

    NARCIS (Netherlands)

    Grelck, C.; Scholz, S.-B.; Shafarenko, A.

    2010-01-01

    We present the rationale and design of S-Net, a coordination language for asynchronous stream processing. The language achieves a near-complete separation between the application code, written in any conventional programming language, and the coordination/communication code written in S-Net. Our app

  12. Usability evaluation of centered time cartograms

    Science.gov (United States)

    Ullah, Rehmat; Mengistu, Eskedar Zelalem; van Elzakker, C. P. J. M.; Kraak, Menno-Jan

    2016-06-01

    A time cartogram visualizes travelling-times between locations. It replaces the geographic distance by time distance and distorts the underlyingmap accordingly. By distorting themap, time cartogramsmay give a more intuitive and clear picture of travelling-times. The distortion of the map, however, can make time cartograms harder to recognize and use. Although cartograms are becoming widespread in use, very little is known about their usability. This study focuses on the usability of centered time cartograms: time cartograms that visualize travellingtimes from a fixed starting location to other destinations in a region. We created several centered time cartograms to answer spatio-temporal questions related to the Dutch railway network. Two experiments were performed: a laboratory test and an online survey. In the laboratory test, we used eye-tracking, thinking aloud, and video-recording to compare four different designs of centered time cartograms to find out which one (or combination) of these performs better in answering spatiotemporal questions and thus, to establish a favorable design strategy for these cartograms. In the online survey, centered time cartograms were evaluated against a geographic and schematic map for accuracy, response time, and preference. The first experiment suggested that among various designs, the centered time cartogram with emphasized railroads is the most preferred design and the centered time cartogram without railroads is the least preferred. The second experiment indicated that overall, centered time cartograms perform better than the two other solutions in performing spatio-temporal tasks, particularly when the task has a dominant time-related component.

  13. Perceived Usability Evaluation of Learning Management Systems: Empirical Evaluation of the System Usability Scale

    Science.gov (United States)

    Orfanou, Konstantina; Tselios, Nikolaos; Katsanos, Christos

    2015-01-01

    Perceived usability affects greatly student's learning effectiveness and overall learning experience, and thus is an important requirement of educational software. The System Usability Scale (SUS) is a well-researched and widely used questionnaire for perceived usability evaluation. However, surprisingly few studies have used SUS to evaluate the…

  14. How Do We Teach Usability? An Investigation of Usability Instruction in Technical Communication

    Science.gov (United States)

    Chong, Felicia

    2013-01-01

    This dissertation investigates the curricular implementation of usability instruction in technical communication. Though there are a plethora of publications and studies on usability in technical communication, little discussion focuses on usability instruction in the classroom or its implementation in the curriculum. Thus, this exploratory…

  15. Improving Usability of Passphrase Authentication

    DEFF Research Database (Denmark)

    Nielsen, Glen; Vedel, Michael; Jensen, Christian D.

    2014-01-01

    The combination of user-names and passwords has become the predominant method of user authentication in computer systems. Most users have multiple accounts on different systems, which impose different constraints on the length and complexity of passwords that the user is allowed to select....... This is done to ensure an appropriate degree of security, but instead, it makes it difficult for users to remember their password, which results in passwords that are either insecure, but easy to remember, or written down on paper. In this paper we address the problem of usability in user authentication......, which accepts the most common typing mistakes. The proposed algorithm has been implemented in secure hardware and integrated into a standard Unix system. We present the design, implementation and preliminary evaluation of the developed passphrase authentication prototype....

  16. Designing Parallel Bus Using Universal Asynchronous Receiver Transmitter

    Directory of Open Access Journals (Sweden)

    Satyandra Sharad

    2013-04-01

    Full Text Available This paper entitled “DESIGNING PARALLEL BUSUSING UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER” is designed to the core of a UART interface module, which includes both receive and transmit modules, and the command parser. This paper will be a viable solution to design parallel buses with the help of UART. In the test bench , there is a RFM(register file model to which we write/read back data from just to check our design .The txt file issues serial inputs to the core and the core outputs parallel data and address in the form of bus. This bus is connected to our RFM (register file model instantiated in the test bench along with the design. This makes easy to retrieve parallel data from serial input. The base of the paper is to use microcontroller along with other components to interface with the physical world. In contrast, most serial communication must first be converted back into parallel form by a universal asynchronous receiver/transmitter (UART before they may be directly connected to a data bus. Both Transmissions (Parallel and Serial are used to connect peripheral devices and enable us to communicate with these devices. The UART core described here is designed using VHDL and implemented on Xilinx Vertex FPGA.

  17. Evaluation of Usability Utilizing Markov Models

    Science.gov (United States)

    Penedo, Janaina Rodrigues; Diniz, Morganna; Ferreira, Simone Bacellar Leal; Silveira, Denis S.; Capra, Eliane

    2012-01-01

    Purpose: The purpose of this paper is to analyze the usability of a remote learning system in its initial development phase, using a quantitative usability evaluation method through Markov models. Design/methodology/approach: The paper opted for an exploratory study. The data of interest of the research correspond to the possible accesses of users…

  18. Usability Studies of a Remedial Multimedia System.

    Science.gov (United States)

    Anjaneyulu, K. S. R.; Singer, R. A.; Harding, R.

    1998-01-01

    Describes the formative evaluation of a multimedia computer system that provides remedial support for university students learning concepts concerning the structure and function of the human brain and describes usability studies of the system using the Software Usability Measurement Inventory (SUMI). Analysis of SUMI items and the student…

  19. Asynchronous Pipeline Micro—Control—Unit (MCU) Chip Design

    Institute of Scientific and Technical Information of China (English)

    ZHOUQian; XUKe; MINHao

    2003-01-01

    The work of this paper includes a researchon asynch ronous design methodology, and a design and implementation of an asynchronous 8-Bit micro-control-unit (MCU). This paper introduces a new application of New-Instruction-Fetching method to detect new instruc-tion which makes this chip fit for demand changeable sys-tem. The instruction set of this asynchronous MCU is compatible with PIC16C6X (Sicrochip Technology Inc).This paper also introduces a new architecture of pipeline,which increases the average speed of chip operation. The asynchronous low power MCU has been fabricated with CSMC (central semiconductor manufacturing corporation)0.6μm CMOS process in Aug 2001. The chip size is about 1.60mm*2.00mm (without taking account of PAD size).Now the test work has been accomplished and the test-ing result of this chip is also presented. The testing result shows that the asynchronous architecture could fulfill all the expected functions, additionally with higher processs peed and lower power consumption than its synchronous counterpart under the same supply voltage.

  20. Exploring the value of usability feedback formats

    DEFF Research Database (Denmark)

    Nørgaard, Mie; Hornbæk, Kasper Anders Søren

    2009-01-01

    The format used to present feedback from usability evaluations to developers affects whether problems are understood, accepted, and fixed. Yet, little research has investigated which formats are the most effective. We describe an explorative study where three developers assess 40 usability findings...... presented using five feedback formats. Our usability findings comprise 35 problems and 5 positive comments. Data suggest that feedback serves multiple purposes. Initially, feedback must convince developers about the relevance of a problem and convey an understanding of this. Feedback must next be easy...... working with the feedback to address the usability problems, there were no significant differences among the developers' ratings of the value of the different formats. This suggests that all of the formats may serve equally well as reminders in later stages of working with usability problems...

  1. Tracing Impact in a Usability Improvement Process

    DEFF Research Database (Denmark)

    Uldall-Espersen, Tobias; Frøkjær, Erik; Hornbæk, Kasper Anders Søren

    2008-01-01

    and the evaluation efforts is established. Results show that evaluation techniques complemented each other by suggesting different kinds of usability improvement. Among the techniques applied, a combination of questionnaires and Metaphors of Human Thinking (MOT) showed the largest mean impact and MOT produced...... the largest number of impacts. Logging of real-life use of the system over 6 months indicated six aspects of improved usability, where significant differences among evaluation techniques were found. Concerning five of the six aspects Think Aloud evaluations and the above-mentioned combination of questionnaire......Analyzing usability improvement processes as they take place in real-life organizations is necessary to understand the practice of usability work. This paper describes a case study where the usability of an information system is improved and a relationship between the improvements...

  2. Usability Evaluation in a Digitally Emerging Country

    DEFF Research Database (Denmark)

    Lizano, Fulvio; Sandoval, Maria Marta; Bruun, Anders

    2013-01-01

    Several emerging countries experience increasing software development activities. With the purpose of provide useful feedback on possible courses of action for increasing application of usability evaluation in such countries, this paper explores the status of usability evaluation in a digitally...... emerging country. Our aim is to identifying common characteristics or behavioral patterns that could be compared with digitally advanced countries. We used an online survey answered by 26 software development organizations, which gave a snapshot of the application of usability evaluation...... in these organizations. We found many similarities with advanced countries, several completely new obstacles more connected with software development matters and a relatively positive improvement in the lack of “usability culture”. These findings suggest good conditions to improve conduction of usability evaluations...

  3. Methods uncovering usability issues in medication-related alerting functions: results from a systematic review.

    Science.gov (United States)

    Marcilly, Romaric; Vasseur, Francis; Ammenwerth, Elske; Beuscart-Zephir, Marie-Catherine

    2014-01-01

    This paper aims at listing the methods used to evaluate the usability of medication-related alerting functions and at knowing what type of usability issues those methods allow to detect. A sub-analysis of data from this systematic review has been performed. Methods applied in the included papers were collected. Then, included papers were sorted in four types of evaluation: "expert evaluation", "user- testing/simulation", "on site observation" and "impact studies". The types of usability issues (usability flaws, usage problems and negative outcomes) uncovered by those evaluations were analyzed. Results show that a large set of methods are used. The largest proportion of papers uses "on site observation" evaluation. This is the only evaluation type for which every kind of usability flaws, usage problems and outcomes are detected. It is somehow surprising that, in a usability systematic review, most of the papers included use a method that is not often presented as a usability method. Results are discussed about the opportunity to provide usability information collected after the implementation of the technology during their design process, i.e. before their implementation.

  4. Inhibition Controls Asynchronous States of Neuronal Networks

    Science.gov (United States)

    Treviño, Mario

    2016-01-01

    Computations in cortical circuits require action potentials from excitatory and inhibitory neurons. In this mini-review, I first provide a quick overview of findings that indicate that GABAergic neurons play a fundamental role in coordinating spikes and generating synchronized network activity. Next, I argue that these observations helped popularize the notion that network oscillations require a high degree of spike correlations among interneurons which, in turn, produce synchronous inhibition of the local microcircuit. The aim of this text is to discuss some recent experimental and computational findings that support a complementary view: one in which interneurons participate actively in producing asynchronous states in cortical networks. This requires a proper mixture of shared excitation and inhibition leading to asynchronous activity between neighboring cells. Such contribution from interneurons would be extremely important because it would tend to reduce the spike correlation between neighboring pyramidal cells, a drop in redundancy that could enhance the information-processing capacity of neural networks. PMID:27274721

  5. Computing by Temporal Order: Asynchronous Cellular Automata

    Directory of Open Access Journals (Sweden)

    Michael Vielhaber

    2012-08-01

    Full Text Available Our concern is the behaviour of the elementary cellular automata with state set 0,1 over the cell set Z/nZ (one-dimensional finite wrap-around case, under all possible update rules (asynchronicity. Over the torus Z/nZ (n<= 11,we will see that the ECA with Wolfram rule 57 maps any v in F_2^n to any w in F_2^n, varying the update rule. We furthermore show that all even (element of the alternating group bijective functions on the set F_2^n = 0,...,2^n-1, can be computed by ECA57, by iterating it a sufficient number of times with varying update rules, at least for n <= 10. We characterize the non-bijective functions computable by asynchronous rules.

  6. Low Latency High Throughout Circular Asynchronous FIFO

    Institute of Scientific and Technical Information of China (English)

    XIAO Yong; ZHOU Runde

    2008-01-01

    This paper describes a circular first in first out (FIFO) and its protocols which have a very low la-tency while still maintaining high throughput. Unlike the existing serial FIFOs based on asynchronous micro-pipelines, this FIFO's cells communicate directly with the input and output ports through a common bus, which effectively eliminates the data movement from the input port to the output port, thereby reducing the latency and the power consumption. Furthermore, the latency does not increase with the number of FIFO stages. Single-track asynchronous protocols are used to simplify the FIFO controller design, with only three C-gates needed in each cell controller, which substantially reduces the area. Simulations with the TSMC 0.25 Ijm CMOS logic process show that the latency of the 4-stage FIFO is less than 581 ps and the throughput is higher than 2.2 GHz.

  7. Inhibition Controls Asynchronous States of Neuronal Networks.

    Science.gov (United States)

    Treviño, Mario

    2016-01-01

    Computations in cortical circuits require action potentials from excitatory and inhibitory neurons. In this mini-review, I first provide a quick overview of findings that indicate that GABAergic neurons play a fundamental role in coordinating spikes and generating synchronized network activity. Next, I argue that these observations helped popularize the notion that network oscillations require a high degree of spike correlations among interneurons which, in turn, produce synchronous inhibition of the local microcircuit. The aim of this text is to discuss some recent experimental and computational findings that support a complementary view: one in which interneurons participate actively in producing asynchronous states in cortical networks. This requires a proper mixture of shared excitation and inhibition leading to asynchronous activity between neighboring cells. Such contribution from interneurons would be extremely important because it would tend to reduce the spike correlation between neighboring pyramidal cells, a drop in redundancy that could enhance the information-processing capacity of neural networks.

  8. An Asynchronous IEEE Floating-Point Arithmetic Unit

    Directory of Open Access Journals (Sweden)

    Joel R. Noche

    2007-12-01

    Full Text Available An asynchronous floating-point arithmetic unit is designed and tested at the transistor level usingCadence software. It uses CMOS (complementary metal oxide semiconductor and DCVS (differentialcascode voltage switch logic in a 0.35 µm process using a 3.3 V supply voltage, with dual-rail data andsingle-rail control signals using four-phase handshaking.Using 17,085 transistors, the unit handles single-precision (32-bit addition/subtraction, multiplication,division, and remainder using the IEEE 754-1985 Standard for Binary Floating-Point Arithmetic, withrounding and other operations to be handled by separate hardware or software. Division and remainderare done using a restoring subtractive algorithm; multiplication uses an additive algorithm. Exceptionsare noted by flags (and not trap handlers and the output is in single-precision.Previous work on asynchronous floating-point arithmetic units have mostly focused on single operationssuch as division. This is the first work to the authors' knowledge that can perform floating-point addition,multiplication, division, and remainder using a common datapath.

  9. Asynchronous exponential growth of a bacterial population

    Directory of Open Access Journals (Sweden)

    Mohamed Boulanouar

    2014-01-01

    Full Text Available In this work, we complete a study started earlier in [1,2] wherein a model of growing bacterial population has been the matter of a mathematical analysis. We show that the full model is governed by a strongly continuous semigroup. Beside the positivity and the irreducibility of the generated semigroup, we describe its asymptotic behavior in the uniform topology which leads to the asynchronous exponential growth of the bacterial population.

  10. An Intelligent Framework for Website Usability

    Directory of Open Access Journals (Sweden)

    Alexiei Dingli

    2014-01-01

    Full Text Available With the major advances of the Internet throughout the past couple of years, websites have come to play a central role in the modern marketing business program. However, simply owning a website is not enough for a business to prosper on the Web. Indeed, it is the level of usability of a website that determines if a user stays or abandons it for another competing one. It is therefore crucial to understand the importance of usability on the web, and consequently the need for its evaluation. Nonetheless, there exist a number of obstacles preventing software organizations from successfully applying sound website usability evaluation strategies in practice. From this point of view automation of the latter is extremely beneficial, which not only assists designers in creating more usable websites, but also enhances the Internet users’ experience on the Web and increases their level of satisfaction. As a means of addressing this problem, an Intelligent Usability Evaluation (IUE tool is proposed that automates the usability evaluation process by employing a Heuristic Evaluation technique in an intelligent manner through the adoption of several research-based AI methods. Experimental results show there exists a high correlation between the tool and human annotators when identifying the considered usability violations.

  11. Blending Online Asynchronous and Synchronous Learning

    Directory of Open Access Journals (Sweden)

    Lisa C. Yamagata-Lynch

    2014-04-01

    Full Text Available In this article I will share a qualitative self-study about a 15-week blended 100% online graduate level course facilitated through synchronous meetings on Blackboard Collaborate and asynchronous discussions on Blackboard. I taught the course at the University of Tennessee (UT during the spring 2012 semester and the course topic was online learning environments. The primary research question of this study was: How can the designer/instructor optimize learning experiences for students who are studying about online learning environments in a blended online course relying on both synchronous and asynchronous technologies? I relied on student reflections of course activities during the beginning, middle, and the end of the semester as the primary data source to obtain their insights regarding course experiences. Through the experiences involved in designing and teaching the course and engaging in this study I found that there is room in the instructional technology research community to address strategies for facilitating online synchronous learning that complement asynchronous learning. Synchronous online whole class meetings and well-structured small group meetings can help students feel a stronger sense of connection to their peers and instructor and stay engaged with course activities. In order to provide meaningful learning spaces in synchronous learning environments, the instructor/designer needs to balance the tension between embracing the flexibility that the online space affords to users and designing deliberate structures that will help them take advantage of the flexible space.

  12. Asynchronous event-based binocular stereo matching.

    Science.gov (United States)

    Rogister, Paul; Benosman, Ryad; Ieng, Sio-Hoi; Lichtsteiner, Patrick; Delbruck, Tobi

    2012-02-01

    We present a novel event-based stereo matching algorithm that exploits the asynchronous visual events from a pair of silicon retinas. Unlike conventional frame-based cameras, recent artificial retinas transmit their outputs as a continuous stream of asynchronous temporal events, in a manner similar to the output cells of the biological retina. Our algorithm uses the timing information carried by this representation in addressing the stereo-matching problem on moving objects. Using the high temporal resolution of the acquired data stream for the dynamic vision sensor, we show that matching on the timing of the visual events provides a new solution to the real-time computation of 3-D objects when combined with geometric constraints using the distance to the epipolar lines. The proposed algorithm is able to filter out incorrect matches and to accurately reconstruct the depth of moving objects despite the low spatial resolution of the sensor. This brief sets up the principles for further event-based vision processing and demonstrates the importance of dynamic information and spike timing in processing asynchronous streams of visual events.

  13. Computer system reliability safety and usability

    CERN Document Server

    Dhillon, BS

    2013-01-01

    Computer systems have become an important element of the world economy, with billions of dollars spent each year on development, manufacture, operation, and maintenance. Combining coverage of computer system reliability, safety, usability, and other related topics into a single volume, Computer System Reliability: Safety and Usability eliminates the need to consult many different and diverse sources in the hunt for the information required to design better computer systems.After presenting introductory aspects of computer system reliability such as safety, usability-related facts and figures,

  14. FPGA Architecture for Multi-Style Asynchronous Logic

    CERN Document Server

    Huot, N; Fesquet, L; Renaudin, M

    2011-01-01

    This paper presents a novel FPGA architecture for implementing various styles of asynchronous logic. The main objective is to break the dependency between the FPGA architecture dedicated to asynchronous logic and the logic style. The innovative aspects of the architecture are described. Moreover the structure is well suited to be rebuilt and adapted to fit with further asynchronous logic evolutions thanks to the architecture genericity. A full-adder was implemented in different styles of logic to show the architecture flexibility.

  15. Designing asynchronous circuits using NULL convention logic (NCL)

    CERN Document Server

    Smith, Scott

    2009-01-01

    Designing Asynchronous Circuits using NULL Convention Logic (NCL) begins with an introduction to asynchronous (clockless) logic in general, and then focuses on delay-insensitive asynchronous logic design using the NCL paradigm. The book details design of input-complete and observable dual-rail and quad-rail combinational circuits, and then discusses implementation of sequential circuits, which require datapath feedback. Next, throughput optimization techniques are presented, including pipelining, embedding registration, early completion, and NULL cycle reduction. Subsequently, low-power design

  16. EPOS for Coordination of Asynchronous Sensor Webs Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Develop, integrate, and deploy software-based tools to coordinate asynchronous, distributed missions and optimize observation planning spanning simultaneous...

  17. Usability of patient-centered health IT: mixed-methods usability study of ePill.

    Science.gov (United States)

    Schmidt-Kraepelin, Manuel; Dehling, Tobias; Sunyaev, Ali

    2014-01-01

    To facilitate use of patient-centered health IT applications in everyday life, a high degree of usability is required. Based on the example of a patient-centered web application, we propose a usability study design enabling developers and researchers to assess usability of patient-centered health IT applications and derive implications for their improvement. Our study design integrates tasks that subjects have to process, an associated questionnaire based on Perceived Ease of Use, Perceived Usefulness, Attitude Toward Using, and Behavioral Intention to Use, a System Usability Scale questionnaire, and focus groups. Application of the usability study design demonstrates its feasibility and provides insights for assessment of usability in related projects in research and practice.

  18. Usability Problems in a Home Telemedicine System

    DEFF Research Database (Denmark)

    Bruun, Anders; Stage, Jan

    2010-01-01

    Home telemedicine systems have the potential to reduce health care costs and improve the quality of life for many patients, including those suffering from chronic illness. This requires that the systems have functionality that fulfils relevant needs. Yet it also requires that the systems have...... a high level of usability in order to enable their users to employ the required functionality, especially if the target user group is elderly people. This paper reports from a usability evaluation of a home telemedicine system. Five elderly persons carried out specified tasks with the system, and based...... on that we identified usability problems with the system. The problems are presented, analysed in relation to 12 different usability themes and related to results from other evaluations of similar systems....

  19. Usability and Interaction Design in West Africa

    DEFF Research Database (Denmark)

    Sørensen, Jannick Kirk

    , with a specific aim at the dissemination of knowledge in field of interaction design both in an academic context, as well as among practitioners. More specifically the paper discusses how interaction design knowledge can be disseminated in West Africa, particularly in Higher Education.......Good usability is important in all ICT solutions. To achieve good usability, a good praxis for interaction design is needed. Usability and interaction design have however emerged and established itself in a North European and US context. The ICT industry in Africa do not have the same resources...... in the field of interaction design as in the developed world. While good usability and good user experiences are important to all users of ICT, the question is whether the methods and techniques that were mainly developed in Scandinavia, Europe and US are suitable for ICT development in Africa? Can ideals...

  20. Usability Engineering in the Wild: How Do Practitioners Integrate Usability Engineering in Software Development?

    OpenAIRE

    Bornoe, Nis; Stage, Jan

    2014-01-01

    Part 1: Research Papers; International audience; It has been argued that too much research on usability engineering is incoherent with the processes, and settings being the realities for practitioners. In this paper we want to extend the existing knowledge about usability engineering in the wild. Through 12 semi-structured interviews we wanted to get an understanding of how usability is perceived, and practiced in reality. We found that our participants primarily focus on upfront work to supp...

  1. Managing Product Usability: How companies deal with usability in the development of electronic consumer products

    OpenAIRE

    Van Kuijk, J.I.

    2010-01-01

    Problem statement: Even though there is a large amount of methods for user-centred design, the usability of electronic consumer products (e.g., portable music players, washing machines and mobile phones) is under pressure. Usability is the extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use. That the usability of electronic consumer products is under pressure is attributed to an incre...

  2. Asynchronous P300 classification in a reactive brain-computer interface during an outlier detection task

    Science.gov (United States)

    Krumpe, Tanja; Walter, Carina; Rosenstiel, Wolfgang; Spüler, Martin

    2016-08-01

    Objective. In this study, the feasibility of detecting a P300 via an asynchronous classification mode in a reactive EEG-based brain-computer interface (BCI) was evaluated. The P300 is one of the most popular BCI control signals and therefore used in many applications, mostly for active communication purposes (e.g. P300 speller). As the majority of all systems work with a stimulus-locked mode of classification (synchronous), the field of applications is limited. A new approach needs to be applied in a setting in which a stimulus-locked classification cannot be used due to the fact that the presented stimuli cannot be controlled or predicted by the system. Approach. A continuous observation task requiring the detection of outliers was implemented to test such an approach. The study was divided into an offline and an online part. Main results. Both parts of the study revealed that an asynchronous detection of the P300 can successfully be used to detect single events with high specificity. It also revealed that no significant difference in performance was found between the synchronous and the asynchronous approach. Significance. The results encourage the use of an asynchronous classification approach in suitable applications without a potential loss in performance.

  3. Usability Assessment of International Office Website of Diponegoro University With Scenario Based Usability Evaluation Method and Wammi Method

    Directory of Open Access Journals (Sweden)

    Ratna Purwaningsih

    2015-09-01

    Full Text Available Website development needs to pay attention to usability aspect which consist of four factors: efficiency, effectiveness, satisfactions and error rate. The website of International Office of Diponegoro University provides academic information for Indonesian students and foreign students. The website still has some problem, especially on searching certain information. This research aims to evaluate the design of the existing website and measures the usability. A well-designed website will help users to meet theirs needs and purposes. The methods used in this study are Scenario-Based End-User Evaluation and WAMMI (Website Analysis and Measurement Inventory. Users perform a number of task on the existing website and on the redesigned website and then provide feedback for each task they have done and fill a WAMMI questionnaire as a test of memorability. This questionnaire used to test users memory on access process of a page from the site. The results of the data processing of usability test show that redesigned website has better value than existing website on effectiveness, efficiency, memorability and error rate.

  4. Adaptation of the EPEC-EM™ Curriculum in a Residency with Asynchronous Learning

    Directory of Open Access Journals (Sweden)

    Gisondi, Michael A

    2010-12-01

    Full Text Available Objective: The Education in Palliative and End-of-life Care for Emergency Medicine Project (EPEC™-EM is a comprehensive curriculum in palliative and end-of-life care for emergency providers. We assessed the adaptation of this course to an EM residency program using synchronous and asynchronous learning.Methods: Curriculum adaptation followed Kern’s standardized six-step curriculum design process. Post-graduate year (PGY 1-4 residents were taught all EPEC™-EM cognitive domains, divided as seven synchronous and seven asynchronous modules. All synchronous modules featured large group didactic lectures and review of EPEC™-EM course materials. Asynchronous modules use only EPEC™-EM electronic course media for resident self-study. Targeted evaluation for EPEC™-EM knowledge objectives was conducted by a prospective case-control crossover study, with synchronous learning serving as the quasi-control, using validated exam tools. We compared de-identified test scores for effectiveness of learning method, using aggregate group performance means for each learning strategy.Results: Of 45 eligible residents 55% participated in a pre-test for local needs analysis, and 78% completed a post-test to measure teaching method effect. Post-test scores improved across all EPEC™-EM domains, with a mean improvement for synchronous modules of +28% (SD=9 and a mean improvement for asynchronous modules of +30% (SD=18. The aggregate mean difference between learning methods was 1.9% (95% CI -15.3, +19.0. Mean test scores of the residents who completed the post-test were: synchronous modules 77% (SD=12; asynchronous modules 83% (SD=13; all modules 80% (SD=12.Conclusion: EPEC™-EM adapted materials can improve resident knowledge of palliative medicine domains, as assessed through validated testing of course objectives. Synchronous and asynchronous learning methods appear to result in similar knowledge transfer, feasibly allowing some course content to be

  5. Usability factors of mobile health application for chronic diseases

    Science.gov (United States)

    Zahra, Fatima; Hussain, Azham; Mohd, Haslina

    2016-08-01

    M-health has changed the conventional delivery system of health-care, permitting continuous, pervasive Health-care anywhere, anytime. Chronic disease apps are increasing, as many health workers, patients and clinicians already embracing smartphones in their comprehensive and diverse practices. There are lots of challenges and requirements that need to be addressed for mobile health applications to prevent or eliminate design problems and minimize potential threats for users, the proposed factors for chronic disease mobile applications can be used as a guide for app developers While, the usability testing, and evaluations of chronic disease apps have not yet touched the accuracy level of other web based applications. This study is being conducted to learn about challenges of m-health apps and to identify the factors that affect the usability of such applications.

  6. Indoor Positioning for Smartphones Using Asynchronous Ultrasound Trilateration

    Directory of Open Access Journals (Sweden)

    James D. Carswell

    2013-06-01

    Full Text Available Modern smartphones are a great platform for Location Based Services (LBS. While outdoor LBS for smartphones has proven to be very successful, indoor LBS for smartphones has not yet fully developed due to the lack of an accurate positioning technology. In this paper we present an accurate indoor positioning approach for commercial off-the-shelf (COTS smartphones that uses the innate ability of mobile phones to produce ultrasound, combined with Time-Difference-of-Arrival (TDOA asynchronous trilateration. We evaluate our indoor positioning approach by describing its strengths and weaknesses, and determine its absolute accuracy. This is accomplished through a range of experiments that involve variables such as position of control point microphones, position of phone within the room, direction speaker is facing and presence of user in the signal path. Test results show that our Lok8 (locate mobile positioning system can achieve accuracies better than 10 cm in a real-world environment.

  7. Asynchronous Event-Driven Particle Algorithms

    Energy Technology Data Exchange (ETDEWEB)

    Donev, A

    2007-08-30

    We present, in a unifying way, the main components of three asynchronous event-driven algorithms for simulating physical systems of interacting particles. The first example, hard-particle molecular dynamics (MD), is well-known. We also present a recently-developed diffusion kinetic Monte Carlo (DKMC) algorithm, as well as a novel stochastic molecular-dynamics algorithm that builds on the Direct Simulation Monte Carlo (DSMC). We explain how to effectively combine event-driven and classical time-driven handling, and discuss some promises and challenges for event-driven simulation of realistic physical systems.

  8. Asynchronous Event-Driven Particle Algorithms

    Energy Technology Data Exchange (ETDEWEB)

    Donev, A

    2007-02-28

    We present in a unifying way the main components of three examples of asynchronous event-driven algorithms for simulating physical systems of interacting particles. The first example, hard-particle molecular dynamics (MD), is well-known. We also present a recently-developed diffusion kinetic Monte Carlo (DKMC) algorithm, as well as a novel event-driven algorithm for Direct Simulation Monte Carlo (DSMC). Finally, we describe how to combine MD with DSMC in an event-driven framework, and discuss some promises and challenges for event-driven simulation of realistic physical systems.

  9. Globally coupled maps with asynchronous updating

    CERN Document Server

    Abramson, G; Abramson, Guillermo; Zanette, Damian H.

    1998-01-01

    We analyze a system of globally coupled logistic maps with asynchronous updating. We show that its dynamics differs considerably from that of the synchronous case. For growing values of the coupling intensity, an inverse bifurcation cascade replaces the structure of clusters and ordering in the phase diagram. We present numerical simulations and an analytical description based on an effective single-element dynamics affected by internal fluctuations. Both of them show how global coupling is able to suppress the complexity of the single-element evolution. We find that, in contrast to systems with synchronous update, internal fluctuations satisfy the law of large numbers.

  10. Two Studies Examining Argumentation in Asynchronous Computer Mediated Communication

    Science.gov (United States)

    Joiner, Richard; Jones, Sarah; Doherty, John

    2008-01-01

    Asynchronous computer mediated communication (CMC) would seem to be an ideal medium for supporting development in student argumentation. This paper investigates this assumption through two studies. The first study compared asynchronous CMC with face-to-face discussions. The transactional and strategic level of the argumentation (i.e. measures of…

  11. Asynchronous Learning Sources in a High-Tech Organization

    Science.gov (United States)

    Bouhnik, Dan; Giat, Yahel; Sanderovitch, Yafit

    2009-01-01

    Purpose: The purpose of this study is to characterize learning from asynchronous sources among research and development (R&D) personnel. It aims to examine four aspects of asynchronous source learning: employee preferences regarding self-learning; extent of source usage; employee satisfaction with these sources and the effect of the sources on the…

  12. Localized radio frequency communication using asynchronous transfer mode protocol

    Science.gov (United States)

    Witzke, Edward L.; Robertson, Perry J.; Pierson, Lyndon G.

    2007-08-14

    A localized wireless communication system for communication between a plurality of circuit boards, and between electronic components on the circuit boards. Transceivers are located on each circuit board and electronic component. The transceivers communicate with one another over spread spectrum radio frequencies. An asynchronous transfer mode protocol controls communication flow with asynchronous transfer mode switches located on the circuit boards.

  13. ASYNCHRONOUS BYZANTINE AGREEMENT PROTOCOL BASED ON VERIFIABLE SIGNATURE SHARING

    Institute of Scientific and Technical Information of China (English)

    Ji Dongyao; Feng Dengguo

    2006-01-01

    An ([n / 3]- 1 )-resilient Asynchronous Byzantine Agreement Protocol (ABAP) that combines verifiable signature sharing and random secret sharing is proposed. The protocol works in the asynchronous network environment and produces Byzantine agreement within a fixed expected number of computational rounds. The correctness of the protocol is proved in theory.

  14. Managing Product Usability: How companies deal with usability in the development of electronic consumer products

    NARCIS (Netherlands)

    Van Kuijk, J.I.

    2010-01-01

    Problem statement: Even though there is a large amount of methods for user-centred design, the usability of electronic consumer products (e.g., portable music players, washing machines and mobile phones) is under pressure. Usability is the extent to which a product can be used by specified users to

  15. Usability evaluation of healthcare information systems: comparison of methods and classification of usability problems

    NARCIS (Netherlands)

    Khajouei, R.

    2011-01-01

    In ziekenhuizen wordt steeds meer gebruik gemaakt van informatiesystemen, maar de usability laat vaak te wensen over. Reza Khajouei testte twee methodes om de usability te beoordelen. Hij constateert dat beide methoden ongeveer evenveel, maar verschillende problemen aan het licht brengen. Uit een en

  16. Mapping Usability: A Critical Research Analysis of Trends in Software Usability Research, Theory, and Practice

    Science.gov (United States)

    Sousa, Morgan Margaret

    2009-01-01

    The impetus for this project stemmed from a curiosity about two particular areas in the history of usability research. For one, I began research for this project with a desire to learn about patterns in the theory, practice, attitude, and perception about usability work, both in academic contexts and in corporate contexts, with a focus on the…

  17. A cross-cultural study of how usability professionals experience the usability of everyday systems

    DEFF Research Database (Denmark)

    Jiang, Yun; Sun, Xianghong; Li, Huiyang

    2009-01-01

    Culture influences many aspects of the design and use of computer systems; understanding better this influence on their own thinking may benefit usability professionals who do cross-cultural usability work. Using Kelly's notion of personal constructs, we focus on one mediator of culture: how...

  18. A Cross-Cultural Study of How Usability Professionals Experience the Usability of Everyday Systems

    DEFF Research Database (Denmark)

    Jiang, Y.; Sun, X.; Li, H.

    2009-01-01

    Culture influences many aspects of the design and use of computer systems; understanding better this influence on their own thinking may benefit usability professionals who do cross-cultural usability work. Using Kelly’s notion of personal constructs, we focus on one mediator of culture: how...

  19. Designing Asynchronous Circuits for Low Power: An IFIR Filter

    DEFF Research Database (Denmark)

    Nielsen, Lars Skovby; Sparsø, Jens

    1999-01-01

    by numerically small samples). Apart from the improved RAM design, these measures are only viable in an asynchronous design. The principles and techniques explained in this paper are of a general nature, and they apply to the design of asynchronous low-power digital signal-processing circuits in a broader......This paper addresses the design of asynchronous circuits for low power through an example: a filter bank for a digital hearing aid. The asynchronous design re-implements an existing synchronous circuit which is used in a commercial product. For comparison, both designs have been fabricated...... in the same 0.7 /spl mu/m CMOS technology. When processing typical data (less than 50 dB sound pressure), the asynchronous control and data-path logic, an improved RAM design, and by a mechanism that adapts the number range to the actual need (exploiting the fact that typical audio signals are characterized...

  20. Asynchronicity of facial blood perfusion in migraine.

    Directory of Open Access Journals (Sweden)

    Nina Zaproudina

    Full Text Available Asymmetrical changes in blood perfusion and asynchronous blood supply to head tissues likely contribute to migraine pathophysiology. Imaging was widely used in order to understand hemodynamic variations in migraine. However, mapping of blood pulsations in the face of migraineurs has not been performed so far. We used the Blood Pulsation Imaging (BPI technique, which was recently developed in our group, to establish whether 2D-imaging of blood pulsations parameters can reveal new biomarkers of migraine. BPI characteristics were measured in migraineurs during the attack-free interval and compared to healthy subjects with and without a family history of migraine. We found a novel phenomenon of transverse waves of facial blood perfusion in migraineurs in contrast to healthy subjects who showed synchronous blood delivery to both sides of the face. Moreover, the amplitude of blood pulsations was symmetrically distributed over the face of healthy subjects, but asymmetrically in migraineurs and subjects with a family history of migraine. In the migraine patients we found a remarkable correlation between the side of unilateral headache and the direction of the blood perfusion wave. Our data suggest that migraine is associated with lateralization of blood perfusion and asynchronous blood pulsations in the facial area, which could be due to essential dysfunction of the autonomic vascular control in the face. These findings may further enhance our understanding of migraine pathophysiology and suggest new easily available biomarkers of this pathology.

  1. Asynchronicity of facial blood perfusion in migraine.

    Science.gov (United States)

    Zaproudina, Nina; Teplov, Victor; Nippolainen, Ervin; Lipponen, Jukka A; Kamshilin, Alexei A; Närhi, Matti; Karjalainen, Pasi A; Giniatullin, Rashid

    2013-01-01

    Asymmetrical changes in blood perfusion and asynchronous blood supply to head tissues likely contribute to migraine pathophysiology. Imaging was widely used in order to understand hemodynamic variations in migraine. However, mapping of blood pulsations in the face of migraineurs has not been performed so far. We used the Blood Pulsation Imaging (BPI) technique, which was recently developed in our group, to establish whether 2D-imaging of blood pulsations parameters can reveal new biomarkers of migraine. BPI characteristics were measured in migraineurs during the attack-free interval and compared to healthy subjects with and without a family history of migraine. We found a novel phenomenon of transverse waves of facial blood perfusion in migraineurs in contrast to healthy subjects who showed synchronous blood delivery to both sides of the face. Moreover, the amplitude of blood pulsations was symmetrically distributed over the face of healthy subjects, but asymmetrically in migraineurs and subjects with a family history of migraine. In the migraine patients we found a remarkable correlation between the side of unilateral headache and the direction of the blood perfusion wave. Our data suggest that migraine is associated with lateralization of blood perfusion and asynchronous blood pulsations in the facial area, which could be due to essential dysfunction of the autonomic vascular control in the face. These findings may further enhance our understanding of migraine pathophysiology and suggest new easily available biomarkers of this pathology.

  2. Selective particle capture by asynchronously beating cilia

    Science.gov (United States)

    Ding, Yang; Kanso, Eva

    2015-12-01

    Selective particle filtration is fundamental in many engineering and biological systems. For example, many aquatic microorganisms use filter feeding to capture food particles from the surrounding fluid, using motile cilia. One of the capture strategies is to use the same cilia to generate feeding currents and to intercept particles when the particles are on the downstream side of the cilia. Here, we develop a 3D computational model of ciliary bands interacting with flow suspended particles and calculate particle trajectories for a range of particle sizes. Consistent with experimental observations, we find optimal particle sizes that maximize capture rate. The optimal size depends nonlinearly on cilia spacing and cilia coordination, synchronous vs. asynchronous. These parameters affect the cilia-generated flow field, which in turn affects particle trajectories. The low capture rate of smaller particles is due to the particles' inability to cross the flow streamlines of neighboring cilia. Meanwhile, large particles have difficulty entering the sub-ciliary region once advected downstream, also resulting in low capture rates. The optimal range of particle sizes is enhanced when cilia beat asynchronously. These findings have potentially important implications on the design and use of biomimetic cilia in processes such as particle sorting in microfluidic devices.

  3. Controllability of asynchronous Boolean multiplex control networks

    Science.gov (United States)

    Luo, Chao; Wang, Xingyuan; Liu, Hong

    2014-09-01

    In this article, the controllability of asynchronous Boolean multiplex control networks (ABMCNs) is studied. First, the model of Boolean multiplex control networks under Harvey' asynchronous update is presented. By means of semi-tensor product approach, the logical dynamics is converted into linear representation, and a generalized formula of control-depending network transition matrices is achieved. Second, a necessary and sufficient condition is proposed to verify that only control-depending fixed points of ABMCNs can be controlled with probability one. Third, using two types of controls, the controllability of system is studied and formulae are given to show: (a) when an initial state is given, the reachable set at time s under a group of specified controls; (b) the reachable set at time s under arbitrary controls; (c) the specific probability values from a given initial state to destination states. Based on the above formulae, an algorithm to calculate overall reachable states from a specified initial state is presented. Moreover, we also discuss an approach to find the particular control sequence which steers the system between two states with maximum probability. Examples are shown to illustrate the feasibility of the proposed scheme.

  4. Controllability of asynchronous Boolean multiplex control networks.

    Science.gov (United States)

    Luo, Chao; Wang, Xingyuan; Liu, Hong

    2014-09-01

    In this article, the controllability of asynchronous Boolean multiplex control networks (ABMCNs) is studied. First, the model of Boolean multiplex control networks under Harvey' asynchronous update is presented. By means of semi-tensor product approach, the logical dynamics is converted into linear representation, and a generalized formula of control-depending network transition matrices is achieved. Second, a necessary and sufficient condition is proposed to verify that only control-depending fixed points of ABMCNs can be controlled with probability one. Third, using two types of controls, the controllability of system is studied and formulae are given to show: (a) when an initial state is given, the reachable set at time s under a group of specified controls; (b) the reachable set at time s under arbitrary controls; (c) the specific probability values from a given initial state to destination states. Based on the above formulae, an algorithm to calculate overall reachable states from a specified initial state is presented. Moreover, we also discuss an approach to find the particular control sequence which steers the system between two states with maximum probability. Examples are shown to illustrate the feasibility of the proposed scheme.

  5. Resynchronization of the Asynchronous Polar CD Ind

    Science.gov (United States)

    Myers, Gordon; Patterson, Joseph; de Miguel, Enrique; Hambsch, Franz-Josef; Monard, Berto; Bolt, Greg; McCormick, Jennie; Rea, Robert; Allen, William

    2017-04-01

    CD Ind is one of only four confirmed asynchronous polars (APs). APs are strongly magnetic cataclysmic variables of the AM Herculis subclass with the characteristic that their white dwarfs rotate a few percent out of synchronism with their binary orbit. Theory suggests that nova eruptions disrupt previously synchronized states. Following the eruption, the system is expected to rapidly resynchronize over a timescale of centuries. The other three asynchronous polars—V1432 Aql, BY Cam, and V1500 Cyg—have resynchronization time estimates ranging from 100 to more than 3500 years, with all but one being less than 1200 years. We report on the analysis of over 46,000 observations of CD Ind taken between 2007 and 2016, combined with previous observations from 1996, and estimate a CD Ind resynchronization time of 6400 ± 800 years. We also estimate an orbital period of 110.820(1) minutes and a current (2016.4) white dwarf spin period of 109.6564(1) minutes.

  6. Asynchronous learning: student utilization out of sync with their preference

    Directory of Open Access Journals (Sweden)

    Edward K. Lew

    2016-06-01

    Full Text Available Background: Asynchronous learning is gaining popularity. Data are limited regarding this learning method in medical students rotating in emergency medicine (EM. In EM, faculty time is limited to give in-person lectures. The authors sought to create an online curriculum that students could utilize as an additional learning modality. Objective: The goal was to evaluate effectiveness, participation, and preference for this mode of learning. Methods: We developed five online, narrated PowerPoint presentations. After orientation, access to the online curriculum was provided to the students, which they could review at their leisure. Results: One hundred and seven fourth-year medical students participated. They reported the curriculum to be of high quality. Pretest scores were similar for those that viewed all lectures – compliant group (CG (9.5 [CI 4.8–14.1] and those that did not view any – non-compliant group (NCG (9.6 [CI 5.9–13.4]. There was no statistical significant difference in posttest scores between the groups although there was improvement overall: CG 14.6 (CI 6.9–22.1; NCG 11.4 (CI 5.7–17.1. A majority (69.2% favored inclusion of asynchronous learning, but less than a quarter (22.4% reported viewing all five modules and more than a third (36.4% viewed none. Conclusion: Despite student-expressed preference for an online curriculum, they used the online resource less than expected. This should give pause to educators looking to convert core EM topics to an online format. However, when high-quality online lectures are utilized as a learning tool, this study demonstrates that they had neither a positive nor a negative impact on test scores.

  7. Lessons learned from the usability assessment of home-based telemedicine systems.

    Science.gov (United States)

    Agnisarman, Sruthy Orozhiyathumana; Chalil Madathil, Kapil; Smith, Kevin; Ashok, Aparna; Welch, Brandon; McElligott, James T

    2017-01-01

    At-home telemedicine visits are quickly becoming an acceptable alternative for in-person patient visits. However, little work has been done to understand the usability of these home-based telemedicine solutions. It is critical for user acceptance and real-world applicability to evaluate available telemedicine solutions within the context-specific needs of the users of this technology. To address this need, this study evaluated the usability of four home-based telemedicine software platforms: Doxy.me, Vidyo, VSee, and Polycom. Using a within-subjects experimental design, twenty participants were asked to complete a telemedicine session involving several tasks using the four platforms. Upon completion of these tasks for each platform, participants completed the IBM computer system usability questionnaire (CSUQ) and the NASA Task Load Index test. Upon completing the tasks on all four platforms, the participants completed a final post-test subjective questionnaire ranking the platforms based on their preference. Of the twenty participants, 19 completed the study. Statistically significant differences among the telemedicine software platforms were found for task completion time, total workload, mental demand, effort, frustration, preference ranking and computer system usability scores. Usability problems with installation and account creation led to high mental demand and task completion time, suggesting the participants preferred a system without such requirements. Majority of the usability issues were identified at the telemedicine initiation phase. The findings from this study can be used by software developers to develop user-friendly telemedicine systems.

  8. Measuring the Usability of Augmented Reality e-Learning Systems: A User-Centered Evaluation Approach

    Science.gov (United States)

    Pribeanu, Costin; Balog, Alexandru; Iordache, Dragoş Daniel

    The development of Augmented Reality (AR) systems is creating new challenges and opportunities for the designers of e-learning systems. The mix of real and virtual requires appropriate interaction techniques that have to be evaluated with users in order to avoid usability problems. Formative usability aims at finding usability problems as early as possible in the development life cycle and is suitable to support the development of such novel interactive systems. This work presents an approach to the user-centered usability evaluation of an e-learning scenario for Biology developed on an Augmented Reality educational platform. The evaluation has been carried on during and after a summer school held within the ARiSE research project. The basic idea was to perform usability evaluation twice. In this respect, we conducted user testing with a small number of students during the summer school in order to get a fast feedback from users having good knowledge in Biology. Then, we repeated the user testing in different conditions and with a relatively larger number of representative users. In this paper we describe both experiments and compare the usability evaluation results.

  9. Usability Issues of Grid System Software

    Institute of Scientific and Technical Information of China (English)

    Zhi-Wei Xu; Hao-Jie Zhou; Guo-Jie Li

    2006-01-01

    This paper addresses the problem why grid technology has not spread as fast as the Web technology of the 1990's. In the past 10 years, considerable efforts have been put into grid computing. Much progress has been made and more importantly, fundamental challenges and essential issues of this field are emerging. This paper focuses on the area of grid system software research, and argues that usability of grid system software must be enhanced. It identifies four usability issues, drawing from international grid research experiences. It also presents advances by the Vega Grid team in addressing these challenges.

  10. Developer Driven and User Driven Usability Evaluations

    DEFF Research Database (Denmark)

    Bruun, Anders

    2013-01-01

    Usability evaluation provide software development teams with insights on the degree to which a software application enables a user to achieve his/her goals, how fast these goals can be achieved, how easy it is to learn and how satisfactory it is in use Although usability evaluations are crucial....... The four primary findings from my studies are: 1) The developer driven approach reveals a high level of thoroughness and downstream utility. 2) The user driven approach has higher performance regarding validity 3) The level of reliability is comparable between the two approaches. 4) The user driven...

  11. Game usability advancing the player experience

    CERN Document Server

    Isbister, Katherine

    2008-01-01

    I. What is usability and why should I care?A. Overview chapter Isbister and Schaffer (Editors)Introduces key concepts and positions book for primary audiences: game developers andstudents aspiring to work in game development. Addresses key concerns that developersmay have about adopting usability, and sets a broad road map of what is to come in thebook.B. Interview with Tobi Saulnier of 1st PlayableA discussion with the CEO of a small game studio about why and how she uses usabilitytechniques in her development.C. Interview with Don Norman of Nielsen Norman groupA discussion with one of the pr

  12. Usability Engineering of Games: A Comparative Analysis of Measuring Excitement Using Sensors, Direct Observations and Self-Reported Data

    Directory of Open Access Journals (Sweden)

    Arwa Alamoudi

    2014-07-01

    Full Text Available Usability engineering and usability testing are concepts that continue to evolve. Interesting research studies and new ideas come up every now and then. This paper tests the hypothesis of using an EDA-based physiological measurements as a usability testing tool by considering three measures; which are observers‟ opinions, self-reported data and EDA-based physiological sensor data. These data were analyzed comparatively and statistically. It concludes by discussing the findings that has been obtained from those subjective and objective measures, which partially supports the hypothesis.

  13. Perceived usefulness of a usability issues reporting form to help understand "usability-induced use-errors": a preliminary study.

    Science.gov (United States)

    Marcilly, Romaric; Boog, Cesar; Leroy, Nicolas; Pelayo, Sylvia

    2014-01-01

    The Medical Device regulation requires manufacturers to anticipate and prevent risks of use errors of their medical device. However, manufacturers experience difficulties to understand the concept of "usability-induced use-errors". Based on a "usability framework" aiming at describing the relationship between usability design principles, usability flaws, usage problems, and outcomes, a usability evaluation reporting form had been designed to support understanding the use-error concept. This paper reports the preliminary evaluation of the perceived usefulness of this form. Results show that manufacturers found helpful the presentation of the results of a usability evaluation through this form for it supports the understanding of the usability origins and the consequences of use-errors. Even if the use of this reporting form should be made easier as usability experts experience difficulties to fill it, it seems a promising way to clearly present "usability-induced use-errors" to manufacturers.

  14. Commande adaptive d'une machine asynchrone

    OpenAIRE

    I. Slama-Belkhodja; De Fornel, B.

    1996-01-01

    Cat article décrit une stratégie de commande adaptive indirecte à Placement de Pôles (PP), appliquée à la commande en vitesse d'une machine asynchrone alimentée par un ensemble hacheur-filtre-onduleur de tension. L'algorithme des Moindres Carrés Récursifs (MCR) est utilisé pour l'identification des modèles de comportement type entrées/sorties. Un intérêt particulier est porté à la mise en oeuvre de cet algorithme et à la discussion de ses résultats, tenant compte des erreurs de modélisation e...

  15. Implementation of Universal Asynchronous Receiver and Transmitter

    Directory of Open Access Journals (Sweden)

    Payata Srikanth Yadav

    2015-03-01

    Full Text Available Universal Asynchronous Receiver Transmitter (UART is the serial communication protocol that is used for data exchange between computer & peripherals. UART is a low velocity, short-distance, low-cost protocol. UART includes three modules which are received, the baud rate generator and transmitter. The UART design with Very High Description Language can be integrated into the Field Programmable Gate Array to achieve stable data transmission and to make system reliable and compact. In the result and simulation part, this project will focus on check the receive data with error free & baud rate generation at different frequencies. Before synthesizing of UART a baud rate generator is incorporated into the system. We use the frequency divider which sets itself to required frequency for the functionality at lower frequency. All modules are designed using VERILOG and implemented on Xilinx Suite development board.

  16. Asynchronous Parallel Evolutionary Algorithms for Constrained Optimizations

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Recently Guo Tao proposed a stochastic search algorithm in his PhD thesis for solving function op-timization problems. He combined the subspace search method (a general multi-parent recombination strategy) with the population hill-climbing method. The former keeps a global search for overall situation,and the latter keeps the convergence of the algorithm. Guo's algorithm has many advantages ,such as the sim-plicity of its structure ,the higher accuracy of its results, the wide range of its applications ,and the robustness of its use. In this paper a preliminary theoretical analysis of the algorithm is given and some numerical experiments has been done by using Guo's algorithm for demonstrating the theoretical results. Three asynchronous paral-lel evolutionary algorithms with different granularities for MIMD machines are designed by parallelizing Guo's Algorithm.

  17. Scalable asynchronous execution of cellular automata

    Science.gov (United States)

    Folino, Gianluigi; Giordano, Andrea; Mastroianni, Carlo

    2016-10-01

    The performance and scalability of cellular automata, when executed on parallel/distributed machines, are limited by the necessity of synchronizing all the nodes at each time step, i.e., a node can execute only after the execution of the previous step at all the other nodes. However, these synchronization requirements can be relaxed: a node can execute one step after synchronizing only with the adjacent nodes. In this fashion, different nodes can execute different time steps. This can be a notable advantageous in many novel and increasingly popular applications of cellular automata, such as smart city applications, simulation of natural phenomena, etc., in which the execution times can be different and variable, due to the heterogeneity of machines and/or data and/or executed functions. Indeed, a longer execution time at a node does not slow down the execution at all the other nodes but only at the neighboring nodes. This is particularly advantageous when the nodes that act as bottlenecks vary during the application execution. The goal of the paper is to analyze the benefits that can be achieved with the described asynchronous implementation of cellular automata, when compared to the classical all-to-all synchronization pattern. The performance and scalability have been evaluated through a Petri net model, as this model is very useful to represent the synchronization barrier among nodes. We examined the usual case in which the territory is partitioned into a number of regions, and the computation associated with a region is assigned to a computing node. We considered both the cases of mono-dimensional and two-dimensional partitioning. The results show that the advantage obtained through the asynchronous execution, when compared to the all-to-all synchronous approach is notable, and it can be as large as 90% in terms of speedup.

  18. Evaluating the Efficiency of Asynchronous Systems with FASE

    CERN Document Server

    Buti, Federico; Corradini, Flavio; Di Berardini, Maria Rita; Vogler, Walter

    2011-01-01

    In this paper, we present FASE (Faster Asynchronous Systems Evaluation), a tool for evaluating the worst-case efficiency of asynchronous systems. The tool is based on some well-established results in the setting of a timed process algebra (PAFAS: a Process Algebra for Faster Asynchronous Systems). To show the applicability of FASE to concrete meaningful examples, we consider three implementations of a bounded buffer and use FASE to automatically evaluate their worst-case efficiency. We finally contrast our results with previous ones where the efficiency of the same implementations has already been considered.

  19. Application of Artificial Intelligence Techniques for the Control of the Asynchronous Machine

    Directory of Open Access Journals (Sweden)

    F. Khammar

    2016-01-01

    Full Text Available The induction machine is experiencing a growing success for two decades by gradually replacing the DC machines and synchronous in many industrial applications. This paper is devoted to the study of advanced methods applied to the command of the asynchronous machine in order to obtain a system of control of high performance. While the criteria for response time, overtaking, and static error can be assured by the techniques of conventional control, the criterion of robustness remains a challenge for researchers. This criterion can be satisfied only by applying advanced techniques of command. After mathematical modeling of the asynchronous machine, it defines the control strategies based on the orientation of the rotor flux. The results of the different simulation tests highlight the properties of robustness of algorithms proposed and suggested to compare the different control strategies.

  20. An FDES-Based Shared Control Method for Asynchronous Brain-Actuated Robot.

    Science.gov (United States)

    Liu, Rong; Wang, Yong-Xuan; Zhang, Lin

    2016-06-01

    The asynchronous brain-computer interface (BCI) offers more natural human-machine interaction. However, it is still considered insufficient to control rapid and complex sequences of movements for a robot without any advanced control method. This paper proposes a new shared controller based on the supervisory theory of fuzzy discrete event system (FDES) for brain-actuated robot control. The developed supervisory theory allows the more reliable control mode to play a dominant role in the robot control which is beneficial to reduce misoperation and improve the robustness of the system. The experimental procedures consist of real-time direct manual control and BCI control tests from ten volunteers. Both tests have shown that the proposed method significantly improves the performance and robustness of the robotic control. In an online BCI experiment, eight of the participants successfully controlled the robot to circumnavigate obstacles and reached the target with a three mental states asynchronous BCI while the other two participants failed in all the BCI control sessions. Furthermore, the FDES-based shared control method also helps to reduce the workload. It can be stated that the asynchronous BCI, in combination with FDES-based shared controller, is feasible for the real-time and robust control of robotics.

  1. The usability issues of faceted navigation in digital libraries

    Directory of Open Access Journals (Sweden)

    Eliane Blumer

    2014-07-01

    Full Text Available The last decade transformed faceted navigation from a “nice-to-have” into a “must-have functionality” for all online web services that contain a search function. The movement has been started by commercial websites, such as online clothing stores, with the purpose of facilitating access to the products.Now, faceted search seems to be more and more well-known within the community of information institutions and their digital services, too, as for example the online catalogue ofthe Library of Congress or Europeana show. In this context, as well, the feature is often sold as an added value to access the content of their sites in a more effective way. Still, experience shows that the use of faceted navigation in a digital library context is more complex than for online clothing stores. For this reason, it is important to focus on the usability of such functionalities and to test it as often as possible during implementation and regular use, as well. Site providers have to be aware of one important fact: a faceted search that has not been implemented correctly or does not work in the way the user expects it, will create frustration and/or not be used at all. This implies in a worst case scenario that users don’t come back to the site anymore, and may even spread their negative experience among the community. To prevent this, usability tests, either with experts or real users, should be conducted regularly.This can be done with common usability tests, using direct human interaction with a system, or with online tests, where test user are free to fill in the test whenever they want. In both cases, test results illuminate a system’s weaknesses and expose dysfunctional issues, which should be improved in order to offer a positive experience to its users.For more than five years, the project ACCEPT, a subproject of a Swiss national project called e-lib.ch, analyzes the usability and usefulness of digital libraries, by using user oriented

  2. Supporting Usability Engineering in Small Software Development Organizations

    DEFF Research Database (Denmark)

    Bornoe, Nis; Stage, Jan

    2013-01-01

    Despite an interest and use of different usability engineering methods small software development organizations find it challenging to implement usability engineering into the software development process. We present the results from a study about usability engineering in practice. Through a series...... of semistructured interviews we want to get an understanding of how usability is implemented into the organizations and how it’s practiced in reality. We found that the developers found it problematic to combine agile software development methods with classic usability engineering methods. A lack of solid usability...... engineering expertise and not least experience seems to be a main obstacle for a successful implementation of usability engineering into current software development practices. They are requesting methods and procedures that fit better with their current practices and strategies to implement usability...

  3. Optimum Multiuser Detector for Multipath Slow Fading Asynchronous CDMA Channels

    Institute of Scientific and Technical Information of China (English)

    WangZhaocheng; YangZhixing; 等

    1995-01-01

    A structure of optimum multiuser detector for asynchronous CDMA in multipath slow fading channels is derived and the significant performance gain over the conventional RAKE receiv-er is shown by simulation.

  4. A proof system for asynchronously communicating deterministic processes

    NARCIS (Netherlands)

    de Boer, F.S.; van Hulst, M.

    1994-01-01

    We introduce in this paper new communication and synchronization constructs which allow deterministic processes, communicating asynchronously via unbounded FIFO buffers, to cope with an indeterminate environment. We develop for the resulting parallel programming language, which subsumes deterministi

  5. Usability Dimensions for Mobile Applications-A Review

    OpenAIRE

    Rosnita Baharuddin; Dalbir Singh; Rozilawati Razali

    2013-01-01

    Usability has been increasingly recognized as a significant quality dimension to determine the success of mobile applications. Due to its importance, a number of usability guidelines have been proposed to direct the design of usable applications. The guidelines are intended particularly for desktop and web-based applications. Mobile applications on the other hand are different in many ways from those applications due to the mobility nature of mobile devices. To date, the usability guidelines ...

  6. How to Reach Evidence-Based Usability Evaluation Methods.

    Science.gov (United States)

    Marcilly, Romaric; Peute, Linda

    2017-01-01

    This paper discusses how and why to build evidence-based knowledge on usability evaluation methods. At each step of building evidence, requisites and difficulties to achieve it are highlighted. Specifically, the paper presents how usability evaluation studies should be designed to allow capitalizing evidence. Reciprocally, it presents how evidence-based usability knowledge will help improve usability practice. Finally, it underlines that evaluation and evidence participate in a virtuous circle that will help improve scientific knowledge and evaluation practice.

  7. Novel Asynchronous Wrapper and Its Application to GALS Systems

    Institute of Scientific and Technical Information of China (English)

    Zhuang Shengxian; Peng Anjin; Lars Wanhammar

    2006-01-01

    An asynchronous wrapper with novel handshake circuits for data communication in globally asynchronous locally synchronous (GALS) systems is proposed. The handshake circuits include two communication ports and a local clock generator. Two approaches for the implementation of communication ports are presented, one with pure standard cells and the others with Müller-C elements. The detailed design methodology for GALS systems is given and the circuits are validated with VHDL and circuits simulation in standard CMOS technology.

  8. Experimental 3D Asynchronous Field Programmable Gate Array (FPGA)

    Science.gov (United States)

    2015-03-01

    EXPERIMENTAL 3D ASYNCHRONOUS FIELD PROGRAMMABLE GATE ARRAY ( FPGA ) CORNELL UNIVERSITY MARCH 2015 FINAL TECHNICAL REPORT APPROVED FOR PUBLIC...From - To) OCT 2011 – OCT 2014 4. TITLE AND SUBTITLE EXPERIMENTAL 3D ASYNCHRONOUS FIELD PROGRAMMABLE GATE ARRAY ( FPGA ) 5a. CONTRACT NUMBER...in collaboration with Albany’s College of Nanoscale Science and Engineering. 15. SUBJECT TERMS 3D Technology, vertical interconnects, AFPGA, FPGA

  9. The usability issues of faceted navigation in digital libraries

    Directory of Open Access Journals (Sweden)

    Eliane Blumer

    2014-05-01

    For more than five years, the project ACCEPT, a subproject of a Swiss national project called e-lib.ch, analyzes the usability and usefulness of digital libraries, by using user oriented methods. Experience has shown that filters provided through faceted navigation are considered as positive and very useful by end users. Nevertheless, based on different test results, several returning mistakes have been detected and it turns out that there are some ‘unwritten standards’ concerning e.g. position, labelling or ranking which should be respected to fulfil the aim of a good usability which users do expect of such web services. In this poster we will first give an introduction to faceted navigation, actual design issues and their use in digital libraries and then present testing methods, which can be easily applied in a digital library context. Together with a list of best practices concerning faceted navigation drawn out of different test experiences, the paper should give the reader all important information to evaluate its current faceted navigation and see where improvements could be made.

  10. Forensic botany: usability of bryophyte material in forensic studies.

    Science.gov (United States)

    Virtanen, Viivi; Korpelainen, Helena; Kostamo, Kirsi

    2007-10-25

    Two experiments were performed to test the relevance of bryophyte (Plantae, Bryophyta) material for forensic studies. The first experiment was conducted to reveal if, and how well, plant fragments attach to footwear in general. In the test, 16 persons walked outdoors wearing rubber boots or hiking boots. After 24h of use outdoors the boots were carefully cleaned, and all plant fragments were collected. Afterwards, all plant material was examined to identify the species. In the second experiment, fresh material of nine bryophyte species was kept in a shed in adverse conditions for 18 months, after which DNA was extracted and subjected to genotyping to test the quality of the material. Both experiments give support for the usability of bryophyte material in forensic studies. The bryophyte fragments become attached to shoes, where they remain even after the wearer walks on a dry road for several hours. Bryophyte DNA stays intact, allowing DNA profiling after lengthy periods following detachment from the original plant source. Based on these experiments, and considering the fact that many bryophytes are clonal plants, we propose that bryophytes are among the most usable plants to provide botanical evidence for forensic investigations.

  11. A Guided Online and Mobile Self-Help Program for Individuals With Eating Disorders: An Iterative Engagement and Usability Study

    Science.gov (United States)

    Dimopoulos, Christina N; Flaschberger, Edith; Saffran, Kristina; Kruger, Jenna F; Garlock, Lindsay; Wilfley, Denise E; Taylor, Craig B; Jones, Megan

    2016-01-01

    Background Numerous digital health interventions have been developed for mental health promotion and intervention, including eating disorders. Efficacy of many interventions has been evaluated, yet knowledge about reasons for dropout and poor adherence is scarce. Most digital health intervention studies lack appropriate research design and methods to investigate individual engagement issues. User engagement and program usability are inextricably linked, making usability studies vital in understanding and improving engagement. Objective The aim of this study was to explore engagement and corresponding usability issues of the Healthy Body Image Program—a guided online intervention for individuals with body image concerns or eating disorders. The secondary aim was to demonstrate the value of usability research in order to investigate engagement. Methods We conducted an iterative usability study based on a mixed-methods approach, combining cognitive and semistructured interviews as well as questionnaires, prior to program launch. Two separate rounds of usability studies were completed, testing a total of 9 potential users. Thematic analysis and descriptive statistics were used to analyze the think-aloud tasks, interviews, and questionnaires. Results Participants were satisfied with the overall usability of the program. The average usability score was 77.5/100 for the first test round and improved to 83.1/100 after applying modifications for the second iteration. The analysis of the qualitative data revealed five central themes: layout, navigation, content, support, and engagement conditions. The first three themes highlight usability aspects of the program, while the latter two highlight engagement issues. An easy-to-use format, clear wording, the nature of guidance, and opportunity for interactivity were important issues related to usability. The coach support, time investment, and severity of users’ symptoms, the program’s features and effectiveness, trust

  12. Usability Evaluation of a Web-Based Learning System

    Science.gov (United States)

    Nguyen, Thao

    2012-01-01

    The paper proposes a contingent, learner-centred usability evaluation method and a prototype tool of such systems. This is a new usability evaluation method for web-based learning systems using a set of empirically-supported usability factors and can be done effectively with limited resources. During the evaluation process, the method allows for…

  13. How usability work informed development of an insurance sales system

    DEFF Research Database (Denmark)

    Uldall-Espersen, Tobias

    2007-01-01

    This paper reports a case study of a software development project where an insurance sales system was developed. Two key persons in the project enforced usability work into the development process and usability work became a key success factor. The usability work was comprehensive and became...

  14. Defining Usability: How Library Practice Differs from Published Research

    Science.gov (United States)

    Chen, Yu-Hui; Germain, Carol Anne; Rorissa, Abebe

    2011-01-01

    Library/information science professionals need a clearly articulated definition of usability/Web usability to implement intuitive websites. In this study, the authors analyzed usability definitions provided by the ARL library professionals and those found in the library/information science and computer science-information systems literature.…

  15. 36 CFR 1193.31 - Accessibility and usability.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 3 2010-07-01 2010-07-01 false Accessibility and usability... COMPLIANCE BOARD TELECOMMUNICATIONS ACT ACCESSIBILITY GUIDELINES Requirements for Accessibility and Usability § 1193.31 Accessibility and usability. When required by § 1193.21, telecommunications equipment...

  16. MODIFIED MICROPIPLINE ARCHITECTURE FOR SYNTHESIZABLE ASYNCHRONOUS FIR FILTER DESIGN

    Directory of Open Access Journals (Sweden)

    Basel Halak

    2016-02-01

    Full Text Available The use of asynchronous design approaches to construct digital signal processing (DSP systems is a rapidly growing research area driven by a wide range of emerging energy constrained applications such as wireless sensor network, portable medical devices and brain implants. The asynchronous design techniques allow the construction of systems which are samples driven, which means they only dissipate dynamic energy when there processing data and idle otherwise. This inherent advantage of asynchronous design over conventional synchronous circuits allows them to be energy efficient. However the implementation flow of asynchronous systems is still difficult due to its lack of compatibility with industrystandard synchronous design tools and modelling languages. This paper devises a novel asynchronous design for a finite impulse response (FIR filter, an essential building block of DSP systems, which is synthesizable and suitable for implementation using conventional synchronous systems design flow and tools. The proposed design is based on a modified version of the micropipline architecture and it is constructed using four phase bundled data protocol. A hardware prototype of the proposed filter has been developed on an FPGA, and systematically verified. The results prove correct functionality of the novel design and a superior performance compared to a synchronous FIR implementation. The findings of this work will allow a wider adoption of asynchronous circuits by DSP designers to harness their energy and performance benefits.

  17. Usability: managing facilities for social outcomes

    DEFF Research Database (Denmark)

    Alexander, Keith; Blakstad, Siri; Hansen, Geir

    2013-01-01

    they used to understand, as well as to design and manage the relationship between activities and places. The paper describes and reviews the development of the field of research on usability. It concludes that the action and use of facilities is strongly related to experiences of the users and thus......111 on Usability has been exploring concepts, methods and tools, developed in the evaluation of all kinds of consumer products, applied to the built environment. In the most recent phase of this work, conducted over the past three years, an international network of partners has collaborated to focus...... properties of a workplace, they could better manage and design the facilities for improved social outcomes. Interpretation and analysis of the built environment (and support services) based on how it is socially constructed will enable integration of organisational use and the facilities provided to arrive...

  18. On the Usability of Spoken Dialogue Systems

    DEFF Research Database (Denmark)

    Larsen, Lars Bo

     This work is centred on the methods and problems associated with defining and measuring the usability of Spoken Dialogue Systems (SDS). The starting point is the fact that speech based interfaces has several times during the last 20 years fallen short of the high expectations and predictions held...... by industry, researchers and analysts. Several studies in the literature of SDS indicate that this can be ascribed to a lack of attention from the speech technology community towards the usability of such systems. The experimental results presented in this work are based on a field trial with the OVID home...... the data, and results comparable to those obtained by other researchers are demonstrated. A correspondence between the objective and subjective measures is established by the application of Multivariate Linear Regression (MLR) as used in the PARADISE scheme proposed by researchers from AT&T. The resulting...

  19. Usability in Public Services and Border Control

    Science.gov (United States)

    Pirelli, Giuliano

    The paper starts with a brief overview of the scale of disability and associated challenges and puts them in the context of the public policy on disability. It then analyses the usability challenges in public services and border control, including the issues of accessibility, safety and communication. These need to be addressed in future policy proposals, to provide the best assistance by new technologies to elderly people and people with disabilities, avoiding creating new barriers due to incorrect or incomplete initial conception. With increasing flux of novel security technology in mass transportation systems, and particularly the use of biometric identification in airports, the challenge of usability is recognized. This paper analyses these issues in the context of users with disability in an idealized process of Simplifying Passenger Travel (SPT).

  20. Usability Evaluation of www.budget.com

    DEFF Research Database (Denmark)

    Bruun, Anders; Jensen, Janne Jul; Skov, Mikael B.

    This report presents the results of a usability evaluation of the budget.com website. The evaluation was carried out by a team of 4 HCI experts, and it involved 10 potential users. The evaluation is based on measurement of (1) task completion time, (2) task completion, (3) user satisfaction and (4......) perceived workload. We have also analyzed the user interaction with the website for (5) usability problems. Through the evaluation, we have found the following weaknesses of the website:   Reservation takes considerably more time than promised. The website indicates that a reservation can be made in 60...... browse around in the menu and try other measures. The information on the website is difficult to access and use. There is a large amount of information with very little structure on it; it is accessed through a long list of links. The structure is not supporting the user, and the information...

  1. Usability and trust in e-banking.

    Science.gov (United States)

    Pravettoni, Gabriella; Leotta, Salvatore Nuccio; Lucchiari, Claudio; Misuraca, Raffaella

    2007-12-01

    This study assessed the role of usability in trust of e-banking services. A questionnaire was administered to 185 Italian undergraduate working students who volunteered for the experiment (M age = 30.5 yr., SD = 3.1). Participants were differentiated on computer ability (Expert, n = 104; Nonexpert, n = 81) and e-banking use (User, n = 93; Nonusers, n = 92). Analysis showed that the website usability of e-banking services did not play a very important role for the User group. Instead, institution-based trust, e.g., the trust in the security policy of the Web merchant, customers, and the overall trust of the bank were the crucial factors in the adoption of e-banking.

  2. A Low-Power Asynchronous Step-Down DC-DC Converter for Implantable Devices.

    Science.gov (United States)

    Al-Terkawi Hasib, Omar; Sawan, M; Savaria, Y

    2011-06-01

    In this paper, we present a fully integrated asynchronous step-down switched capacitor dc-dc conversion structure suitable for supporting ultra-low-power circuits commonly found in biomedical implants. The proposed converter uses a fully digital asynchronous state machine as the heart of the control circuitry to generate the drive signals. To minimize the switching losses, the asynchronous controller scales the switching frequency of the drive signals according to the loading conditions. It also turns on additional parallel switches when needed and has a backup synchronous drive mode. This circuit regulates load voltages from 300 mV to 1.1 V derived from a 1.2-V input voltage. A total of 350 pF on-chip capacitance was implemented to support a maximum of 230-μ W load power, while providing efficiency up to 80%. The circuit validating the proposed concepts was fabricated in 0.13- μm complementary metal-oxide semiconductor technology. Experimental test results confirm the expected functionality and performance of the proposed circuit.

  3. An Asynchronous Multi-Sensor Micro Control Unit for Wireless Body Sensor Networks (WBSNs

    Directory of Open Access Journals (Sweden)

    Ching-Hsing Luo

    2011-07-01

    Full Text Available In this work, an asynchronous multi-sensor micro control unit (MCU core is proposed for wireless body sensor networks (WBSNs. It consists of asynchronous interfaces, a power management unit, a multi-sensor controller, a data encoder (DE, and an error correct coder (ECC. To improve the system performance and expansion abilities, the asynchronous interface is created for handshaking different clock domains between ADC and RF with MCU. To increase the use time of the WBSN system, a power management technique is developed for reducing power consumption. In addition, the multi-sensor controller is designed for detecting various biomedical signals. To prevent loss error from wireless transmission, use of an error correct coding technique is important in biomedical applications. The data encoder is added for lossless compression of various biomedical signals with a compression ratio of almost three. This design is successfully tested on a FPGA board. The VLSI architecture of this work contains 2.68-K gate counts and consumes power 496-μW at 133-MHz processing rate by using TSMC 0.13-μm CMOS process. Compared with the previous techniques, this work offers higher performance, more functions, and lower hardware cost than other micro controller designs.

  4. ASYNCHRONOUS COMPUTER-MEDIATED CORRECTIVE FEEDBACK AND THE CORRECT USE OF PREPOSITIONS: Is It Really Effective?

    Directory of Open Access Journals (Sweden)

    Seyyed Behrooz HOSSEINI

    2012-08-01

    Full Text Available An area that has recently attracted increasing attention is providing feedback on learners’ writing accuracy through the Internet. However, research in this area has largely focused on synchronous communication, i.e., chatting, with fewer studies assessing asynchronous technologies, i.e., e-mailing. Therefore, this study investigates the effectiveness of asynchronous computer-mediated corrective feedback-explicit and implicit, on increasing the correct use of prepositions. Forty-five Iranian elementary EFL learners at the ILI in Tehran were randomly assigned to two experimental groups, receiving explicit and implicit corrective feedback respectively, and one control group receiving no corrective feedback. Each group included 15 participants. After the treatment, a post-test was administered to assess the probable increase in the correct use of prepositions for the experimental groups compared to the control group. Analysis of the results through a one-way ANOVA revealed that the experimental group 1 who received explicit corrective feedback significantly outperformed the experimental group 2 and the control group. The experimental group 2 who received implicit corrective feedback showed no significant improvement over the experimental group 1 and the control group. Computer-mediated communication, asynchronous CMC, synchronous CMC, the Internet, corrective feedback, e-mail, chat. Although the findings support the current view on feedback through technology, due to the scarcity of research, more investigation is merited as there is much to gain regarding this burgeoning field.

  5. USABILITY EVALUATION OF A CONTROL AND PROGRAMMING ENVIRONMENT FOR PROGRAMMING EDUCATION

    Directory of Open Access Journals (Sweden)

    Maísa S. dos S. Lopes

    2016-07-01

    Full Text Available This paper presents an assessment of usability of Control and Programming Environment (CPE of a remote mobile robot. The CPE is an educational environment focused on computer programming education that integrates a program development online tool with a remote lab. To evaluate system usability, empirical test was conducted with computer science students in order to identify the views of users on the system and get directions on how to improve the quality of interface use. The study used questionnaire and observation of the evaluator. The degree of users’ satisfaction was measured by using a quantitative approach that establishes the average ranking for each question of the questionnaire. The results indicate that the system is simple, easy to use and suited to programming practices, however needed changes to make it more intuitive and efficient. The realization test of usability, even with a small sample user, is important to provide feedback on the system's user experience and help identify problems.

  6. Classroom orchestration : The third circle of usability

    OpenAIRE

    Dillenbourg, Pierre; Zufferey, Guillaume; Alavi, Hamed Seyed; Jermann, Patrick; Do, Lenh Hung Son; Bonnard, Quentin; Cuendet, Sébastien; Kaplan, Frédéric

    2011-01-01

    We analyze classroom orchestration as a question of usability in which the classroom is the user. Our experiments revealed design features that reduce the global orchestration load. According to our studies in vocational schools, paper-based interfaces have the potential of making educational workflows tangible, i.e. both visible and manipulable. Our studies in university classes converge on minimalism: they reveal the effectiveness o tools that make visible what is invisible but do not analy...

  7. The Usability of Online Geographic Virtual Reality for Urban Planning

    Science.gov (United States)

    Zhang, S.; Moore, A. B.

    2013-08-01

    Virtual reality (VR) technology is starting to become widely and freely available (for example the online OpenSimulator tool), with potential for use in 3D urban planning and design tasks but still needing rigorous assessment to establish this. A previous study consulted with a small group of urban professionals, who concluded in a satisfaction usability test that online VR had potential value as a usable 3D communication and remote marketing tool but acknowledged that visual quality and geographic accuracy were obstacles to overcome. This research takes the investigation a significant step further to also examine the usability aspects of efficiency (how quickly tasks are completed) and effectiveness (how successfully tasks are completed), relating to OpenSimulator in an urban planning situation. The comparative study pits a three-dimensional VR model (with increased graphic fidelity and geographic content to address the feedback of the previous study) of a subdivision design (in a Dunedin suburb) against 3D models built with GIS (ArcGIS) and CAD (BricsCAD) tools, two types of software environment well established in urban professional practice. Urban professionals participated in the study by attempting to perform timed tasks correctly in each of the environments before being asked questions about the technologies involved and their perceived importance to their professional work. The results reinforce the positive feedback for VR of the previous study, with the graphical and geographic data issues being somewhat addressed (though participants stressed the need for accurate and precise object and terrain modification capabilities in VR). Ease-ofuse and associated fastest task completion speed were significant positive outcomes to emerge from the comparison with GIS and CAD, pointing to a strong future for VR in an urban planning context.

  8. A Longitudinal Study of Usability in Health Care

    DEFF Research Database (Denmark)

    Kjeldskov, Jesper; Skov, Mikael B.; Stage, Jan

    2010-01-01

    We report from a longitudinal laboratory-based usability evaluation of a health care information system. The purpose of the study was to inquire into the nature of usability problems experienced by novice and expert users, and to see to what extend usability problems of a health care information...... system may or may not disappear over time, as the nurses get more familiar with it-if time heals poor design? As our method for studying this, we conducted a longitudinal study with two key studies. A usability evaluation was conducted with novice users when an electronic patient record system was being......, we discuss implications for evaluating usability in health care....

  9. Playground usability: what do playground users say?

    Science.gov (United States)

    Ripat, Jacquie; Becker, Pam

    2012-09-01

    Play, specifically outdoor play, is crucial for a child's development. However, not all playgrounds are designed to provide usable space for children with disabilities. The aim of the study was to gain an understanding of the experiences of playground use for children with disabilities and their caregivers. Using a qualitative descriptive design, interviews were conducted with children with disabilities and their caregivers. Interview transcripts were reviewed and coded. The analysis process resulted in three overarching themes. Playground Experiences addressed the sensory experiences that children seek at playgrounds, the importance of creating environments that promote imaginative play and the need to provide an appropriate level of challenge. In the second theme, Playground Usability, participants described barriers that prevent access and features that promote use. The third theme, Inclusivity, focused on equal access and the importance of providing options in design. The Person-Environment-Occupation model was used to frame the findings and to identify practice and research recommendations. Outdoor play is a key occupation of children, and occupational therapists have a role in promoting usable environments for all children.

  10. Usability Evaluation Criteria for Internet of Things

    Directory of Open Access Journals (Sweden)

    Michael Onuoha Thomas

    2016-12-01

    Full Text Available The field of usability, user experience (UX design and human-computer interaction (HCI arose in the realm of desktop computers and applications. The current experience in computing has radically evolved into ubiquitous computing over the preceding years. Interactions these days take place on different devices: mobile phones, e-readers and smart TVs, amid numerous smart devices. The use of one service across multiple devices is, at present, common with different form factors. Academic researchers are still trying to figure out the best design techniques for new devices and experiences. The Internet of Things (IoT is growing, with an ever wider range of daily objects acquiring connectivity, sensing ability and increased computing power. Designing for IoT raises a lot of challenges; the obvious difference being the much wider variety of device form factors. IoT is still a technically driven field, thus the usability of many of IoT products is, in some way, of the level anticipated of mature consumer products. This study focuses on proposing a usability evaluation criterion for the generic IoT architecture and essential technological components

  11. Rapid, generalized adaptation to asynchronous audiovisual speech.

    Science.gov (United States)

    Van der Burg, Erik; Goodbourn, Patrick T

    2015-04-01

    The brain is adaptive. The speed of propagation through air, and of low-level sensory processing, differs markedly between auditory and visual stimuli; yet the brain can adapt to compensate for the resulting cross-modal delays. Studies investigating temporal recalibration to audiovisual speech have used prolonged adaptation procedures, suggesting that adaptation is sluggish. Here, we show that adaptation to asynchronous audiovisual speech occurs rapidly. Participants viewed a brief clip of an actor pronouncing a single syllable. The voice was either advanced or delayed relative to the corresponding lip movements, and participants were asked to make a synchrony judgement. Although we did not use an explicit adaptation procedure, we demonstrate rapid recalibration based on a single audiovisual event. We find that the point of subjective simultaneity on each trial is highly contingent upon the modality order of the preceding trial. We find compelling evidence that rapid recalibration generalizes across different stimuli, and different actors. Finally, we demonstrate that rapid recalibration occurs even when auditory and visual events clearly belong to different actors. These results suggest that rapid temporal recalibration to audiovisual speech is primarily mediated by basic temporal factors, rather than higher-order factors such as perceived simultaneity and source identity.

  12. Asynchronous Rate Chaos in Spiking Neuronal Circuits

    Science.gov (United States)

    Harish, Omri; Hansel, David

    2015-01-01

    The brain exhibits temporally complex patterns of activity with features similar to those of chaotic systems. Theoretical studies over the last twenty years have described various computational advantages for such regimes in neuronal systems. Nevertheless, it still remains unclear whether chaos requires specific cellular properties or network architectures, or whether it is a generic property of neuronal circuits. We investigate the dynamics of networks of excitatory-inhibitory (EI) spiking neurons with random sparse connectivity operating in the regime of balance of excitation and inhibition. Combining Dynamical Mean-Field Theory with numerical simulations, we show that chaotic, asynchronous firing rate fluctuations emerge generically for sufficiently strong synapses. Two different mechanisms can lead to these chaotic fluctuations. One mechanism relies on slow I-I inhibition which gives rise to slow subthreshold voltage and rate fluctuations. The decorrelation time of these fluctuations is proportional to the time constant of the inhibition. The second mechanism relies on the recurrent E-I-E feedback loop. It requires slow excitation but the inhibition can be fast. In the corresponding dynamical regime all neurons exhibit rate fluctuations on the time scale of the excitation. Another feature of this regime is that the population-averaged firing rate is substantially smaller in the excitatory population than in the inhibitory population. This is not necessarily the case in the I-I mechanism. Finally, we discuss the neurophysiological and computational significance of our results. PMID:26230679

  13. Managing Asynchronous Data in ATLAS's Concurrent Framework

    CERN Document Server

    Leggett, Charles; The ATLAS collaboration

    2016-01-01

    In order to be able to make effective use of emerging hardware, where the amount of memory available to any CPU is rapidly decreasing as the core count continues to rise, ATLAS has begun a migration to a concurrent, multi-threaded software framework, known as AthenaMT. Significant progress has been made in implementing AthenaMT - we can currently run realistic Geant4 simulations on massively concurrent machines. the migration of realistic prototypes of reconstruction workflows is more difficult, given the large amounts of legacy code and the complexity and challenges of reconstruction software. These types of workflows, however, are the types that will most benefit from the memory reduction features of a multi-threaded framework. One of the challenges that we will report on in this paper is the re-design and implementation of several key asynchronous technologies whose behaviour is radically different in a concurrent environment than in a serial one, namely the management of Conditions data and the Detector D...

  14. Modelo de programación asíncrona para Web transaccionales en un ambiente distribuido Asynchronous programming model for transactional Web in a distributed environment

    Directory of Open Access Journals (Sweden)

    Luis Marco Cáceres Alvarez

    2011-06-01

    Full Text Available El presente trabajo define y detalla un modelo de programación asíncrono para sistemas de información Web transaccionales orientado a servicios en un ambiente distribuido uniendo las ventajas de las técnicas de programación Web asíncronas (AJAX, patrones de diseño orientados a objetos y servicios Web, para la obtención de aplicativos caracterizados por ser tolerantes a fallos, distribuidos, eficientes y usables. Principalmente se puntualizan los problemas encontrados en el modelo para uso de servicios Web clásicos, por ende se define, documenta y desarrolla un modelo de programación que solucione y mejore los servicios Web clásicos y se valide la solución a través del desarrollo de un prototipo basado en el modelo de programación definido.The present work defines and details an asynchronous programming model for transactional web information systems in distributed environment, joining the advantages of web asynchronous programming techniques (AJAX, object oriented design patterns and web services, to obtain fail tolerant, distributed, efficient and usable applications. The problems found in the classical Web services model are pointed out and a new model to solve and improve most common web services is defined, documented and developed. Also, a prototype is developed to validate the given solution using the defined model.

  15. Social Context in Usability Evaluations: Concepts, Processes and Products

    DEFF Research Database (Denmark)

    Jensen, Janne Jul

    This thesis addresses social context of usability evaluations. Context plays an important role in usability evaluations. A major part of the context of a usability evaluation is the people involved. This is also often referred to as the social context of the usability evaluation, and although...... social context is considered important, only little research has been done to identify how it influences usability evaluations. In this thesis I explore how social context affects the process and product of a usability evaluation and explain the findings in terms of the theory of behaviour settings...... and a field experiment. Findings from these activities are presented in five published paper contributions. I furthermore introduce the theory of behaviour settings as a tool to help characterise the key concepts of social context which, together with an understanding of usability evaluations, provide...

  16. 三相异步电机空载试验特性曲线拟合%Characteristic curve-fitting of ho-load test for three-phase asynchronous motor

    Institute of Scientific and Technical Information of China (English)

    刘鹏; 郭颖达; 王志芳

    2011-01-01

    Data processing of motor type test has a problem of low precision of curve-fitting. This paper proposed a curve-fitting function and made a detailed discussion on how to discriminate original data and the function that fits no-load test. VC++ language is adopted to realize data discrimination and draw a characteristic curve of high precision.%针对处理电机试验数据时曲线拟合精度低的情况,提出了空载试验的拟合函数.详细讨论了对原始数据的甄别,以及适用于空载试验的函数,采用VC++实现数据甄别,绘制精度高的特性曲线.

  17. ASCERTAINMENT OF THE EQUIVALENT CIRCUIT PARAMETERS OF THE ASYNCHRONOUS MACHINE

    Directory of Open Access Journals (Sweden)

    V. S. Safaryan

    2015-01-01

    Full Text Available The article considers experimental and analytical determination of the asynchronous machine equivalent-circuit parameters with application of the reference data. Transient processes investigation of the asynchronous machines necessitates the equivalent circuit parameters (resistance impedance, inductances and coefficient of the stator-rotor contours mutual inductance that help form the transitory-process mathematical simulation model. The reference books do not provide those parameters; they instead give the rated ones (active power, voltage, slide, coefficient of performance and capacity coefficient as well as the ratio of starting and nominal currents and torques. The noted studies on the asynchronous machine equivalent-circuits parametrization fail to solve the problems ad finem or solve them with admissions. The paper presents experimental and analytical determinations of the asynchronous machine equivalent-circuit parameters: the experimental one based on the results of two measurements and the analytical one where the problem boils down to solving a system of nonlineal algebraic equations. The authors investigate the equivalent asynchronous machine input-resistance properties and adduce the dependence curvatures of the input-resistances on the slide. They present a symbolic model for analytical parameterization of the asynchronous machine equivalent-circuit that represents a system of nonlineal equations and requires one of the rotor-parameters arbitrary assignment. The article demonstrates that for the asynchronous machine equivalent-circuit experimental parameterization the measures are to be conducted of the stator-circuit voltage, current and active power with two different slides and arbitrary assignment of one of the rotor parameters. The paper substantiates the fact that additional measurement does not discard the rotor-parameter choice arbitrariness. The authors establish that in motoring mode there is a critical slide by which the

  18. The cultural evolution of human communication systems in different sized populations: usability trumps learnability.

    Science.gov (United States)

    Fay, Nicolas; Ellison, T Mark

    2013-01-01

    This study examines the intergenerational transfer of human communication systems. It tests if human communication systems evolve to be easy to learn or easy to use (or both), and how population size affects learnability and usability. Using an experimental-semiotic task, we find that human communication systems evolve to be easier to use (production efficiency and reproduction fidelity), but harder to learn (identification accuracy) for a second generation of naïve participants. Thus, usability trumps learnability. In addition, the communication systems that evolve in larger populations exhibit distinct advantages over those that evolve in smaller populations: the learnability loss (from the Initial signs) is more muted and the usability benefits are more pronounced. The usability benefits for human communication systems that evolve in a small and large population is explained through guided variation reducing sign complexity. The enhanced performance of the communication systems that evolve in larger populations is explained by the operation of a content bias acting on the larger pool of competing signs. The content bias selects for information-efficient iconic signs that aid learnability and enhance usability.

  19. The cultural evolution of human communication systems in different sized populations: usability trumps learnability.

    Directory of Open Access Journals (Sweden)

    Nicolas Fay

    Full Text Available This study examines the intergenerational transfer of human communication systems. It tests if human communication systems evolve to be easy to learn or easy to use (or both, and how population size affects learnability and usability. Using an experimental-semiotic task, we find that human communication systems evolve to be easier to use (production efficiency and reproduction fidelity, but harder to learn (identification accuracy for a second generation of naïve participants. Thus, usability trumps learnability. In addition, the communication systems that evolve in larger populations exhibit distinct advantages over those that evolve in smaller populations: the learnability loss (from the Initial signs is more muted and the usability benefits are more pronounced. The usability benefits for human communication systems that evolve in a small and large population is explained through guided variation reducing sign complexity. The enhanced performance of the communication systems that evolve in larger populations is explained by the operation of a content bias acting on the larger pool of competing signs. The content bias selects for information-efficient iconic signs that aid learnability and enhance usability.

  20. Usability and Interoperability in Wireless Sensor Networks for Patient Telemonitoring in Chronic Disease Management.

    Science.gov (United States)

    Jiménez-Fernández, Silvia; de Toledo, Paula; del Pozo, Francisco

    2013-12-01

    This paper addresses two key technological barriers to the wider adoption of patient telemonitoring systems for chronic disease management, namely, usability and sensor device interoperability. As a great percentage of chronic patients are elderly patients as well, usability of the system has to be adapted to their needs. This paper identifies (from previous research) a set of design criteria to address these challenges, and describes the resulting system based on a wireless sensor network, and including a node as a custom-made interface that follows usability design criteria stated. This system has been tested with 22 users (mean age 65) and evaluated with a validated usability questionnaire. Results are good and improve those of other systems based on TV or smartphone. Our results suggest that user interfaces alternative to TVs and smartphones could play an important role on the usability of sensor networks for patient monitoring. Regarding interoperability, only very recently a standard has been published (2010, the ISO IEEE 11073 Personal health devices) that can support the needs of limited computational power environments typical of patient monitoring sensor networks.

  1. IHadoop: Asynchronous iterations for MapReduce

    KAUST Repository

    Elnikety, Eslam Mohamed Ibrahim

    2011-11-01

    MapReduce is a distributed programming frame-work designed to ease the development of scalable data-intensive applications for large clusters of commodity machines. Most machine learning and data mining applications involve iterative computations over large datasets, such as the Web hyperlink structures and social network graphs. Yet, the MapReduce model does not efficiently support this important class of applications. The architecture of MapReduce, most critically its dataflow techniques and task scheduling, is completely unaware of the nature of iterative applications; tasks are scheduled according to a policy that optimizes the execution for a single iteration which wastes bandwidth, I/O, and CPU cycles when compared with an optimal execution for a consecutive set of iterations. This work presents iHadoop, a modified MapReduce model, and an associated implementation, optimized for iterative computations. The iHadoop model schedules iterations asynchronously. It connects the output of one iteration to the next, allowing both to process their data concurrently. iHadoop\\'s task scheduler exploits inter-iteration data locality by scheduling tasks that exhibit a producer/consumer relation on the same physical machine allowing a fast local data transfer. For those iterative applications that require satisfying certain criteria before termination, iHadoop runs the check concurrently during the execution of the subsequent iteration to further reduce the application\\'s latency. This paper also describes our implementation of the iHadoop model, and evaluates its performance against Hadoop, the widely used open source implementation of MapReduce. Experiments using different data analysis applications over real-world and synthetic datasets show that iHadoop performs better than Hadoop for iterative algorithms, reducing execution time of iterative applications by 25% on average. Furthermore, integrating iHadoop with HaLoop, a variant Hadoop implementation that caches

  2. Model checking methodology for large systems, faults and asynchronous behaviour. SARANA 2011 work report

    Energy Technology Data Exchange (ETDEWEB)

    Lahtinen, J. [VTT Technical Research Centre of Finland, Espoo (Finland); Launiainen, T.; Heljanko, K.; Ropponen, J. [Aalto Univ., Espoo (Finland). Dept. of Information and Computer Science

    2012-07-01

    Digital instrumentation and control (I and C) systems are challenging to verify. They enable complicated control functions, and the state spaces of the models easily become too large for comprehensive verification through traditional methods. Model checking is a formal method that can be used for system verification. A number of efficient model checking systems are available that provide analysis tools to determine automatically whether a given state machine model satisfies the desired safety properties. This report reviews the work performed in the Safety Evaluation and Reliability Analysis of Nuclear Automation (SARANA) project in 2011 regarding model checking. We have developed new, more exact modelling methods that are able to capture the behaviour of a system more realistically. In particular, we have developed more detailed fault models depicting the hardware configuration of a system, and methodology to model function-block-based systems asynchronously. In order to improve the usability of our model checking methods, we have developed an algorithm for model checking large modular systems. The algorithm can be used to verify properties of a model that could otherwise not be verified in a straightforward manner. (orig.)

  3. DYNAMIC REGIMES OF ASYNCHRONOUS MOTORS WITH CONCATENATED CAPACITORS

    Directory of Open Access Journals (Sweden)

    V. S. Malyar

    2015-04-01

    Full Text Available Purpose. Development of mathematical model for calculation of starting modes of asynchronous motor connected in series with capacitors. Method. Mathematical modeling of dynamic modes of asynchronous motors with lateral capacitor compensation of reactive power. Results. The calculation algorithm and results of mathematic modeling of processes during starting modes of asynchronous motor feeding from the network through capacitors connected in series are presented. It is shown that for some values of capacitance the self-excitation processes and subharmonic oscillations can appear. Scientific novelty. Mathematic modeling and research of processes in asynchronous motor under its feeding through capacitors is carried out for the first time. The calculation algorithm is based on the mathematical model of asynchronous motor with high level of adequacy, which takes into account the magnetic core saturation and the current displacement in limbs of the rotor. Practical implication. Developed mathematical model makes it possible to investigate the possibility of self-excitation modes appearing in condition of their feeding from line with lateral compensation of reactance in order to avoid the negative effects typical for them.

  4. Asynchronous reference frame agreement in a quantum network

    Science.gov (United States)

    Islam, Tanvirul; Wehner, Stephanie

    2016-03-01

    An efficient implementation of many multiparty protocols for quantum networks requires that all the nodes in the network share a common reference frame. Establishing such a reference frame from scratch is especially challenging in an asynchronous network where network links might have arbitrary delays and the nodes do not share synchronised clocks. In this work, we study the problem of establishing a common reference frame in an asynchronous network of n nodes of which at most t are affected by arbitrary unknown error, and the identities of the faulty nodes are not known. We present a protocol that allows all the correctly functioning nodes to agree on a common reference frame as long as the network graph is complete and not more than t\\lt n/4 nodes are faulty. As the protocol is asynchronous, it can be used with some assumptions to synchronise clocks over a network. Also, the protocol has the appealing property that it allows any existing two-node asynchronous protocol for reference frame agreement to be lifted to a robust protocol for an asynchronous quantum network.

  5. Asynchronous vascular consultation via electronic methods: A feasibility pilot.

    Science.gov (United States)

    Chittle, Melissa D; Rao, Sandhya K; Jaff, Michael R; Patel, Virendra I; Gallen, Kathleen M; Avadhani, Radhika; Ferris, Timothy G; Wasfy, Jason H

    2015-12-01

    Management of chronic disease often requires multidisciplinary clinical efforts and specialist care. With the emergence of Accountable Care Organizations (ACOs), health care systems are incentivized to evaluate methods of information exchange between generalists and specialists in order to provide value while preserving quality. Our objective was to evaluate patient and referring provider satisfaction and outcomes of asynchronous electronic consultations in vascular care in a large tertiary academic medical center. Referring providers were offered a vascular 'e-consult' option through an electronic referral management system. We conducted chart review to understand the downstream effects and surveyed patients and referring providers to assess satisfaction. From 24 March 2014 to 1 March 2015, 54 e-consults were completed. Additional testing and recommendations were made in 49/54 (90.7%) e-consults, including lower-extremity venous duplex ultrasonography with reflux testing, duplex ultrasonography of the carotid artery, computed tomography, magnetic resonance imaging, non-invasive physiology arterial studies, laboratory tests, medications, compression stockings, and sequential lymphedema compression therapy. Referring providers were compliant with recommendations in 40/49 (81.6%) of e-consults. A total of 17/54 (31.5%) patients were surveyed with a median patient satisfaction score of 13.7/15 (91.3%) (SD ± 6.4). The program was associated with high referring provider satisfaction, with 87.0% finding the e-consult very helpful and 80.0% stating it averted the need for a traditional visit. Our experience suggests that e-consults are an effective way to provide vascular care in some patients and are associated with high patient and provider satisfaction. E-consults may therefore be an efficient method of care delivery for vascular patients within an ACO.

  6. Evaluating the Usability of a Professional Modeling Tool Repurposed for Middle School Learning

    Science.gov (United States)

    Peters, Vanessa L.; Songer, Nancy Butler

    2013-01-01

    This paper reports the results of a three-stage usability test of a modeling tool designed to support learners' deep understanding of the impacts of climate change on ecosystems. The design process involved repurposing an existing modeling technology used by professional scientists into a learning tool specifically designed for middle school…

  7. The Accessibility and Usability of College Websites: Is Your Website Presenting Barriers to Potential Students?

    Science.gov (United States)

    Erickson, William; Trerise, Sharon; Lee, Camille; VanLooy, Sara; Knowlton, Samuel; Bruyère, Susanne

    2013-01-01

    Thirty community college websites were evaluated for compliance with federal web accessibility standards found in Section 508 of the Rehabilitation Act of 1973 (29 U.S.C. 794d). Two typical sites were tested for usability by individuals with visual impairments, individuals with reading-related learning disabilities (LD), and a control group of…

  8. The Ideal Voting Interface: Classifying Usability

    Directory of Open Access Journals (Sweden)

    Damien Mac Namara

    2014-12-01

    Full Text Available This work presents a feature-oriented taxonomy for commercial electronic voting machines, which focuses on usability aspects. Based on this analysis, we propose a ‘Just-Like-Paper’  (JLP classification method which identifies five broad categories of eVoting interface. We extend the classification to investigate its application as an indicator of voting efficiency and identify a universal ten-step process encompassing all possible voting steps spanning the twenty-six machines studied. Our analysis concludes that multi-functional and progressive interfaces are likely to be more efficient versus multi-modal voter-activated machines.

  9. Current Trends in High-Level Synthesis of Asynchronous Circuits

    DEFF Research Database (Denmark)

    Sparsø, Jens

    2009-01-01

    .g. the Haste/TiDE tool from Handshake Solutions or the Balsa tool from the University of Manchester. The aims are to add highlevel synthesis capabilities to these tools and to extend the tools such that a wider range of (higher speed) micro-architectures can be generated. Another branch of research takes...... a conventional synchronous circuit as the starting point, and then adds some form of handshake-based flow-control. One approach keeps the global clock and implements discrete-time asynchronous operation. Another approach substitutes the clocked registers by asynchronous handshake-registers, thus creating truly...... continuous time asynchronous circuits that operate without a clock. The perspective here is that the substitution/conversion is done as the final step in an otherwise conventional synchronous design flow....

  10. On the theoretical gap between synchronous and asynchronous MPC protocols

    DEFF Research Database (Denmark)

    Beerliová-Trubíniová, Zuzana; Hirt, Martin; Nielsen, Jesper Buus

    2010-01-01

    that in the cryptographic setting (with setup), the sole reason for it is the distribution of inputs: given an oracle for input distribution, cryptographically-secure asynchronous MPC is possible with the very same condition as synchronous MPC, namely t ..., we show that such an input-distribution oracle can be reduced to an oracle that allows each party to synchronously broadcast one single message. This means that when one single round of synchronous broadcast is available, then asynchronous MPC is possible at the same condition as synchronous MPC...

  11. Design issues in the semantics and scheduling of asynchronous tasks.

    Energy Technology Data Exchange (ETDEWEB)

    Olivier, Stephen L.

    2013-07-01

    The asynchronous task model serves as a useful vehicle for shared memory parallel programming, particularly on multicore and manycore processors. As adoption of model among programmers has increased, support has emerged for the integration of task parallel language constructs into mainstream programming languages, e.g., C and C++. This paper examines some of the design decisions in Cilk and OpenMP concerning semantics and scheduling of asynchronous tasks with the aim of informing the efforts of committees considering language integration, as well as developers of new task parallel languages and libraries.

  12. Asynchronous Broadcast on the Intel SCC using Interrupts

    OpenAIRE

    Petrović, Darko; Shahmirzadi, Omid; Ropars, Thomas; Schiper, André

    2012-01-01

    International audience; This paper focuses on the design of an asynchronous broadcast primitive on the Intel SCC. Our solution is based on OC-Bcast, a state-of-the-art k-ary tree synchronous broadcast algorithm that leverages the parallelism provided by on-chip Remote Memory Accesses to Message Passing Buffers. In the paper, we study the use of parallel inter-core interrupts as a means to implement an efficient asynchronous group communication primitive, and present the userspace library we d...

  13. A Loosely Synchronizing Asynchronous Router for TDM-Scheduled NOCs

    DEFF Research Database (Denmark)

    Kotleas, Ioannis; Humphreys, Dean; Sørensen, Rasmus Bo

    2014-01-01

    This paper presents an asynchronous router design for use in time-division-multiplexed (TDM) networks-on-chip. Unlike existing synchronous, mesochronous and asynchronous router designs with similar functionality, the router is able to silently skip over cycles/TDM-slots where no traffic...... is scheduled and hence avoid all switching activity in the idle links and router ports. In this way switching activity is reduced to the minimum possible amount. The fact that this relaxed synchronization is sufficient to implement TDM scheduling represents a contribution at the conceptual level. The idea can...

  14. Asynchronous updating of threshold-coupled chaotic neurons

    Indian Academy of Sciences (India)

    Manish Dev Shirmali; Sudeshna Sinha; Kazuyuki Aihara

    2008-06-01

    We study a network of chaotic model neurons incorporating threshold activated coupling. We obtain a wide range of spatiotemporal patterns under varying degrees of asynchronicity in the evolution of the neuronal components. For instance, we find that sequential updating of threshold-coupled chaotic neurons can yield dynamical switching of the individual neurons between two states. So varying the asynchronicity in the updating scheme can serve as a control mechanism to extract different responses, and this can have possible applications in computation and information processing.

  15. A Comparison of Quantitative and Qualitative Data from a Formative Usability Evaluation of an Augmented Reality Learning Scenario

    Directory of Open Access Journals (Sweden)

    Dragos Daniel IORDACHE

    2009-01-01

    Full Text Available The proliferation of augmented reality (AR technologies creates opportunities for the devel-opment of new learning scenarios. More recently, the advances in the design and implementation of desktop AR systems make it possible the deployment of such scenarios in primary and secondary schools. Usability evaluation is a precondition for the pedagogical effectiveness of these new technologies and requires a systematic approach for finding and fixing usability problems. In this paper we present an approach to a formative usability evaluation based on heuristic evaluation and user testing. The basic idea is to compare and integrate quantitative and qualitative measures in order to increase confidence in results and enhance the descriptive power of the usability evaluation report.

  16. Assessing User Trust to Improve Web Usability

    Directory of Open Access Journals (Sweden)

    Punam Bedi

    2006-01-01

    Full Text Available The technological advancement has significantly influenced the style of human-computer interaction, especially for World Wide Web. The users can now afford to choose amongst multiple websites offering similar services. The website which provides a usable interface along with requisite services, scores over its competitors. User interaction with a website is driven by two major factors- the performance factors associated with the site and the emotional factors associated with human being. Amongst the emotional factors, trust is a dominant driving factor of web usage. The more a user trusts a website, more shall be the usage and vice-versa. Trust has almost always been specified qualitatively. This study presents a distinct method of measuring user trust on a website, by considering the features of that website. Four distinct states of a feature are considered in the study. Each of these states has a different impact on user trust formation. The method proposed considers the features, their states and their contribution towards trust formation to compute the user trust on a website. Such a measure can be effectively employed to determine the trust level of a website as perceived by its users. Comparison of different websites with respect to their trust levels can therefore, provide the designer an insight into the weak features of that site. Identifying and correcting these, can help in retaining the users and hence increase the usability of that site.

  17. Crafting usable knowledge for sustainable development.

    Science.gov (United States)

    Clark, William C; van Kerkhoff, Lorrae; Lebel, Louis; Gallopin, Gilberto C

    2016-04-26

    This paper distills core lessons about how researchers (scientists, engineers, planners, etc.) interested in promoting sustainable development can increase the likelihood of producing usable knowledge. We draw the lessons from both practical experience in diverse contexts around the world and from scholarly advances in understanding the relationships between science and society. Many of these lessons will be familiar to those with experience in crafting knowledge to support action for sustainable development. However, few are included in the formal training of researchers. As a result, when scientists and engineers first venture out of the laboratory or library with the goal of linking their knowledge with action, the outcome has often been ineffectiveness and disillusionment. We therefore articulate here a core set of lessons that we believe should become part of the basic training for researchers interested in crafting usable knowledge for sustainable development. These lessons entail at least four things researchers should know, and four things they should do. The knowing lessons involve understanding the coproduction relationships through which knowledge making and decision making shape one another in social-environmental systems. We highlight the lessons that emerge from examining those coproduction relationships through the ICAP lens, viewing them from the perspectives of Innovation systems, Complex systems, Adaptive systems, and Political systems. The doing lessons involve improving the capacity of the research community to put its understanding of coproduction into practice. We highlight steps through which researchers can help build capacities for stakeholder collaboration, social learning, knowledge governance, and researcher training.

  18. Usability Evaluation of Multimedia Courseware (MEL-SindD)

    Science.gov (United States)

    Yussof, Rahmah Lob; Badioze Zaman, Halimah

    Constructive evaluations on any software are needed to ensure the effectiveness and usability of the software. This assesment on the multimedia courseware is part of the researcher's study towards the development and usability of the early reading software for students with Down Syndrome (MEL-SindD). This paper will discuss the usability assesment of this courseware, the methods used for the evaluation as well as suitable approaches that can be deployed to evaluate the courseware effectiveness to disabled children.

  19. A Measure of Fun : Extending the scope of web usability

    OpenAIRE

    Wiberg, Charlotte

    2003-01-01

    Currently usability research and practice are facing a challenge. The focus of design concerns is expanding from predominantly functional aspects of IT systems to overall user experience, which has direct implications for the area of usability evaluation. The aim of the study reported in this thesis is to explore the potential of traditional usability evaluation approaches to deal with issues related to user experience, such as fun and entertainment. The empirical study reported in the thesis...

  20. The Rocky Road : Why Usability Work is so Difficult

    OpenAIRE

    Winter, Jeff

    2013-01-01

    Achieving product and process quality are among the central themes of software engineering, and quality is an important factor in the marketplace. Usability and user experience (UX) are two important aspects of quality, particularly for interactive products. To achieve usability means producing products that let users do things in a satisfactory, efficient and effective way. To develop products with good UX, means going beyond usability, in ways that are still not clear to us. Achieving good ...

  1. Business-Intelligence-Systeme im Spannungsfeld zwischen Usability und Sicherheit

    OpenAIRE

    Hinck, Thorsten

    2010-01-01

    Business-Intelligence-Systeme stehen im Spannungsfeld zwischen Usability und Sicherheit. Die Gefahren und Sicherheitsmaßnahmen für Informationssysteme werden ermittelt und ökonomisch in Bezug zur Gebrauchstauglichkeit gesetzt. Es entsteht ein Sicherheitsprofil für Business-Intelligence-Systeme. Business-Intelligence-Systems are in tension between Usability and IT-Security. Risks and safety measures of informationsystems are defined and set in (economic) regard to Usability. A security prof...

  2. Establishing best practices to improve usability of web interfaces providing atmospheric data

    Science.gov (United States)

    Oakley, N.; Daudert, B.

    2014-12-01

    Accessing scientific data through an online portal can be a frustrating task. The concept of making web interfaces easy to use known as "usability" has been thoroughly researched in the field of e-commerce but has not been explicitly addressed in the atmospheric sciences. As more observation stations are installed, satellite missions flown, models run, and field campaigns performed, large amounts of data are produced. Portals on the Internet have become the favored mechanisms to share this information and are ever increasing in number. Portals are often created without being tested for usability with the target audience though the expenses of testing are low and the returns high. To remain competitive and relevant in the provision of atmospheric data, it is imperative that developers understand design elements of a successful portal to make their product stand out among others. This presentation informs the audience of the benefits and basic principles of usability for web pages presenting atmospheric data. We will also share some of the best practices and recommendations we have formulated from the results of usability testing performed on two data provision web sites hosted by the Western Regional Climate Center.

  3. Enabling Data Discovery and Reuse by Improving Software Usability:Data Science Experiences, Lessons, and Gaps

    Science.gov (United States)

    Rosati, A.; Yarmey, L.

    2014-12-01

    It is well understood that a good data scientist needs domain science, analysis, programming, and communication skills to create finished data products, visualizations, and reports. Articles and blogs tout the need for "expert" skill levels in domain knowledge, statistics, storytelling, graphic design, technology…and the list goes on. Since it seems impossible that one person would encompass all these skills, it is often suggested that data science be done by a team instead of an individual. This research into, and experience with, data product design offers an augmented definition - one that elevates relationships and engagement with the final user of a product. Essentially, no matter how fantastic or technically advanced a product appears, the intended audience of that product must be able to understand, use, and find value in the product in order for it to be considered a success. Usability is often misunderstood and seen as common sense or common knowledge, but it is actually an important and challenging piece of product development. This paper describes the National Snow and Ice Data Center's process to usability test the Arctic Data Explorer (ADE). The ADE is a federated data search tool for interdisciplinary Arctic science data that has been improved in features, appearance, functionality, and quality through a series of strategic and targeted usability testing and assessments. Based on the results, it is recommended that usability testing be incorporated into the skill set of each data science team.

  4. Seeing Double at Memorial University: Two WorldCat Local Usability Studies

    Directory of Open Access Journals (Sweden)

    Sue Fahey

    2011-11-01

    Full Text Available Obtaining user feedback is valuable yet often overlooked, so when Memorial University Libraries launched OCLC’s WorldCat Local discovery tool for Fall 2010, usability testing was a logical next step. Two branches, each with distinct user groups, the Ferriss Hodgett Library in Corner Brook, and the Health Sciences Library in St. John’s, conducted unique usability studies to gain evidence into how WorldCat Local performed common research tasks. The Health Sciences Library was inspired by the information seeking habits of Memorial University’s Faculty of Medicine, School of Nursing, and School of Pharmacy. This demographic’s heavy reliance on journal literature, and known item searching made these users an interesting test group. The Ferriss Hodgett Library, serving an undergraduate Liberal Arts and Sciences population, was interested in the information seeking behavior of new students with little to no experience using library resources. At the local level, evidence obtained as a result of this usability testing will provide guidance into future use of WCL at Memorial University Libraries. On a broader scale, the usability findings are relevant to any library considering the shift to a new discovery tool.

  5. Development of a usability evaluation method using natural product-use motion.

    Science.gov (United States)

    Chang, Joonho; Jung, Kihyo; Lee, Wonsup; You, Heecheon

    2017-04-01

    The present study developed and tested a new usability evaluation method which considers natural product-use motions. The proposed method measures both natural product-use motions (NMs) and actual product-use motions (AMs) for a product using an optical motion capture system and examines the usability of the product based on motion similarity (MS; %) between NMs and AMs. The proposed method was applied to a usability test of four vacuum cleaners (A, B, C, and D) with 15 participants and their MSs were compared with EMG measurements and subjective discomfort ratings. Cleaners A (44.6%) and C (44.2%) showed higher MSs than cleaners B (42.9%) and D (41.7%); the MSs mostly corresponded to the EMG measurements, which could indicate that AMs deviated from NMs may increase muscular efforts. However, the MSs were slightly different from the corresponding discomfort ratings. The proposed method demonstrated its usefulness in usability testing, but further research is needed with various products to generalize its effectiveness.

  6. An extended protocol for usability validation of medical devices: research design and reference model.

    Science.gov (United States)

    Schmettow, Martin; Schnittker, Raphaela; Schraagen, Jan Maarten

    2017-03-21

    This paper proposes and demonstrates an extended protocol for usability validation testing of medical devices. A review of currently used methods for the usability evaluation of medical devices revealed two main shortcomings. Firstly, the lack of methods to closely trace the interaction sequences and derive performance measures. Secondly, a prevailing focus on cross-sectional validation studies, ignoring the issues of learnability and training. The U.S. Federal Drug and Food Administration's recent proposal for a validation testing protocol for medical devices is then extended to address these shortcomings: (1) a novel process measure 'normative path deviations' is introduced that is useful for both quantitative and qualitative usability studies and (2) a longitudinal, completely within-subject study design is presented that assesses learnability, training effects and allows analysis of diversity of users. A reference regression model is introduced to analyze data from this and similar studies, drawing upon generalized linear mixed-effects models and a Bayesian estimation approach. The extended protocol is implemented and demonstrated in a study comparing a novel syringe infusion pump prototype to an existing design with a sample of 25 healthcare professionals. Strong performance differences between designs were observed with a variety of usability measures, as well as varying training-on-the-job effects. We discuss our findings with regard to validation testing guidelines, reflect on the extensions and discuss the perspectives they add to the validation process.

  7. Cost-justifying usability an update for the internet age

    CERN Document Server

    Bias, Randolph G; Bias, Randolph G

    2005-01-01

    You just know that an improvement of the user interface will reap rewards, but how do you justify the expense and the labor and the time-guarantee a robust ROI!-ahead of time? How do you decide how much of an investment should be funded? And what is the best way to sell usability to others? In this completely revised and new edition, Randolph G. Bias (University of Texas at Austin, with 25 years' experience as a usability practitioner and manager) and Deborah J. Mayhew (internationally recognized usability consultant and author of two other seminal books including The Usability Enginee

  8. Assessment of Usability Benchmarks: Combining Standardized Scales with Specific Questions

    Directory of Open Access Journals (Sweden)

    Stephanie Bettina Linek

    2011-12-01

    Full Text Available The usability of Web sites and online services is of rising importance. When creating a completely new Web site, qualitative data are adequate for identifying the most usability problems. However, changes of an existing Web site should be evaluated by a quantitative benchmarking process. The proposed paper describes the creation of a questionnaire that allows a quantitative usability benchmarking, i.e. a direct comparison of the different versions of a Web site and an orientation on general standards of usability. The questionnaire is also open for qualitative data. The methodology will be explained by the digital library services of the ZBW.

  9. The Design Collaboratorium - a place for usability design

    DEFF Research Database (Denmark)

    Bødker, Susanne; Buur, Jacob

    2002-01-01

    The "design collaboratorium" is a new usability practice that has been developed in an action research project between three industrial usability labs and a university. The design collaboratorium has been developed as a reaction to the failing capabilities of classical usability methods to cope...... technology. In light of the case, we will discuss the philosophy underlying the design collaboratorium in further detail: the collaboration between active participants, the role of design artifacts, and the room as a meeting ground. Finally we lay out the working method and propose directions for future...... usability competencies....

  10. New Asynchronous Motor Galvanometer%异步电动机专用电流计

    Institute of Scientific and Technical Information of China (English)

    彭鞍虹; 刘刚; 武传胜

    2001-01-01

    针对异步电动机电流计存在的耐起动电流冲击和指示正常运行电流之间的矛盾,试制了一种新型的异步电动机专用电流计,经测试完全满足工程要求.%A new special galvanometer for asynchronous motor is found, whichresolve the hitting current of motor starting and showing current when motor running. The testing result shows that it can satisfy engineering.

  11. Usability Test for a Digital Archival System in Taiwan: A Case of the Humanities and Social Sciences (HSS Information System 數位典藏資訊網易用性評估:以人文社會科學相關領域中綱計畫成果資訊網為例

    Directory of Open Access Journals (Sweden)

    林巧敏、范維媛 Chiao-Min Lin, Wei-Yuan Fan

    2013-09-01

    Full Text Available With the advent of the Internet there is now growing expectation of end users to be able have more immediate and functional access to digital archive system. Digitization system affords an opportunity to make collections much more broadly available and save users’ time, but the content and the design of system interface are a vital influence on system satisfaction of end users. The paper focuses on a case study of usability testing done on the Information System for Humanity and Social Science Projects (HSS, a digital archive of research reports, conference papers, books, photographs, audio-visual materials from HSS of The Ministry of Education. Task-based usability testing and questionnaires were taken to capture users’ access behavior and analyze the user’s opinions. According to the result, the color of function zones, the browse of material categories, the download of search results and the integrated search function need to improve. This paper details a survey on the procedure of usability testing and obtains users’ perspectives of the system. As the result, conclusions and suggestions will be proposed for improving the system interface design. pp. 49-68隨著資訊網路技術之進步,終端使用者對於數位典藏系統之檢索功能與服務期許與日俱增,數位典藏系統有助於資訊廣泛傳播並節省使用者時間,但系統內容與介面設計之良莠,深深影響使用者對於系統的滿意程度。本研究以「人文社會科學相關領域中綱計畫成果資訊網」為例,進行系統易用性評估,該系統收錄教育部推動人文社會科學領域中綱計畫所有產出之研究報告、會議論文、圖書、照片與活動影音記錄等。研究進行任務取向之系統評估,藉由使用者操作系統之實測觀察過程,分析使用者檢索歷程與操作問題,再輔以問卷方式,探知使用者對於操作系統之滿意度。分析結果發現首頁版面

  12. Creating Usable Pin Array Tactons for Non-Visual Information

    CERN Document Server

    Pietrzak, Thomas; Stephen, Brewster A; Martin, Benoît; Pecci, Isabelle; 10.1109/TOH.2009.6

    2012-01-01

    Spatial information can be difficult to present to a visually impaired computer user. In this paper we examine a new kind of tactile cueing for non-visual interaction as a potential solution, building on earlier work on vibrotactile Tactons. However, unlike vibrotactile Tactons, we use a pin array to stimulate the finger tip. Here, we describe how to design static and dynamic Tactons by defining their basic components. We then present user tests examining how easy it is to distinguish between different forms of pin array Tactons demonstrating accurate Tacton sets to represent directions. These experiments demonstrate usable patterns for static, wave and blinking pin array Tacton sets for guiding a user in one of eight directions. A study is then described that shows the benefits of structuring Tactons to convey information through multiple parameters of the signal. By using multiple independent parameters for a Tacton, this study demonstrates participants perceive more information through a single Tacton. Two...

  13. Usability and Applicability of Microfluidic Cell Culture Systems

    DEFF Research Database (Denmark)

    Hemmingsen, Mette

    Microfluidic cell culture has been a research area with great attention the last decade due to its potential to mimic the in vivo cellular environment more closely compared to what is possible by conventional cell culture methods. Many exciting and complex devices have been presented providing...... possibilities for, for example, precise control of the chemical environment, 3D cultures, controlled co-culture of different cell types or automated, individual control of up to 96 cell culture chambers in one integrated system. Despite the great new opportunities to perform novel experimental designs......, these devices still lack general implementation into biological research laboratories. In this project, the usability and applicability of microfluidic cell culture systems have been investigated. The tested systems display good properties regarding optics and compatibility with standard laboratory equipment...

  14. Usability Evaluation for Business Intelligence Applications: A User Support Perspective

    Directory of Open Access Journals (Sweden)

    Chrisna Jooste

    2014-08-01

    Full Text Available Business Intelligence (BI applications provide business information to drive decision support. Usability is one of the factors determining the optimal use and eventual benefit derived from BI applications. The documented need for more BI usability research together with the practical necessity for BI evaluation guidelines in the mining industry provides the rationale for this study. The purpose of the study was to investigate the usability evaluation of BI applications in the context of a coal mining organization. The research is guided by the question: How can existing usability criteria be customized to evaluate the usability of BI applications. The research design included user observation, heuristic evaluation and a survey. Based on observations made during user support on a BI application used at a coal mining organization a log of usability issues was compiled. The usability issues extracted from this log was compared and contrasted with general usability criteria from literature to synthesize an initial set of BI usability evaluation criteria. These criteria were used as the basis for a heuristic evaluation of the BI application used at the coal mining organization. The same BI application was also evaluated using the Software Usability Measurement Inventory (SUMI standardized questionnaire. The results from the two evaluations were triangulated and then compared with the BI user issues again to contextualize the findings and synthesize a validated and refined set of criteria. The main contribution of the study is the usability evaluation criteria for BI applications presented as guidelines. These guidelines deviate from existing evaluation guidelines in the emphasis on information architecture, learnability and operability.

  15. Principles for Effective Asynchronous Online Instruction in Religious Studies

    Science.gov (United States)

    McGuire, Beverley

    2017-01-01

    Asynchronous online instruction has become increasingly popular in the field of religious studies. However, despite voluminous research on online learning in general and numerous articles on online theological instruction, there has been little discussion of how to effectively design and deliver online undergraduate courses in religious studies.…

  16. Chaos begets order: asynchronous cell contractions drive epithelial morphogenesis.

    Science.gov (United States)

    Paluch, Ewa; Heisenberg, Carl-Philipp

    2009-01-01

    Apical cell contraction triggers tissue folding and invagination in epithelia. During Drosophila gastrulation, ventral furrow formation was thought to be driven by smooth, purse-string-like constriction of an acto-myosin belt underlying adherens junctions. Now Martin et al. report in Nature that ventral furrow formation is triggered by asynchronous pulsed contractions of the apical acto-myosin cortex in individual cells.

  17. Online Graduate Education: Developing Scholars through Asynchronous Discussion

    Science.gov (United States)

    Bowden, Randall

    2012-01-01

    Considerable effort has been placed on understanding and enhancing online interaction to increase student learning, examine teaching strategies, and build learning communities. This research explored another aspect of interaction: the emergence of scholarship by graduate students through asynchronous discussion. Qualitative analysis of archived…

  18. Cyber Asynchronous versus Blended Cyber Approach in Distance English Learning

    Science.gov (United States)

    Ge, Zi-Gang

    2012-01-01

    This study aims to compare the single cyber asynchronous learning approach with the blended cyber learning approach in distance English education. Two classes of 70 students participated in this study, which lasted one semester of about four months, with one class using the blended approach for their English study and the other only using the…

  19. Asynchronous rotation scan for synthetic aperture interferometric radiometer

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    Synthetic aperture interferometric technique has wide applications in optics,radio astronomy and mi-crowave remote sensing areas.With the increasing demands of high resolution imaging observation,a new time-sharing sampling scheme of asynchronous rotation scan is proposed to meet the technical challenge of achieving a large equivalent aperture and overcome the operating barriers of space borne application.This configuration is basically composed by two asynchronously and concentrically ro-tating antenna groups,whose revolving radii and speeds are different.The synthetic aperture system with asynchronous rotation scanning scheme can effectively solve the trade-off problem of system complexity,and greatly simplify the system hardware at the cost of sacrificing a certain time resolution.The basic rules and design methods of asynchronous rotation scan are investigated The Gridding method is introduced to inverse the spiral sampling data for image reconstruction.The potential ap-plications of geostationary orbit(GEO)earth observation and solar polar orbit(SPO)plasma cloud observation are explored with numerical simulations to validate the significance and feasibility of this new imaging configuration.

  20. Students' Use of Asynchronous Discussions for Academic Discourse Socialization

    Science.gov (United States)

    Beckett, Gulbahar H.; Amaro-Jimenez, Carla; Beckett, Kelvin S.

    2010-01-01

    Our universities are becoming increasingly diverse at the same time as online asynchronous discussions (OADs) are emerging as the most important forum for computer mediated communication (CMC) in distance education. But there is shortage of studies that explore how graduate students from different ethnic, linguistic and cultural backgrounds use…

  1. Asynchronous Assessment in a Large Lecture Marketing Course

    Science.gov (United States)

    Downey, W. Scott; Schetzsle, Stacey

    2012-01-01

    Asynchronous assessment, which includes quizzes or exams online or outside class, offers marketing educators an opportunity to make more efficient use of class time and to enhance students' learning experiences by giving them more flexibility and choice in their assessment environment. In this paper, we examine the performance difference between…

  2. Reconceptualising Moderation in Asynchronous Online Discussions Using Grounded Theory

    Science.gov (United States)

    Vlachopoulos, Panos; Cowan, John

    2010-01-01

    This article reports a grounded theory study of the moderation of asynchronous online discussions, to explore the processes by which tutors in higher education decide when and how to moderate. It aims to construct a theory of e-moderation based on some key factors which appear to influence e-moderation. It discusses previous research on the…

  3. Asynchronous rotation scan for synthetic aperture interferometric radiometer

    Institute of Scientific and Technical Information of China (English)

    WU Ji; ZHANG Cheng; LIU Hao; SUN WeiYing

    2009-01-01

    Synthetic aperture interferometric technique has wide applications in optics, radio astronomy and mi-crowave remote sensing areas. With the increasing demands of high resolution imaging observation, a new time-sharing sampling scheme of asynchronous rotation scan is proposed to meet the technical challenge of achieving a large equivalent aperture and overcome the operating barriers of space borne application. This configuration is basically composed by two asynchronously and concentrically ro-tating antenna groups, whose revolving radii and speeds are different. The synthetic aperture system with asynchronous rotation scanning scheme can effectively solve the trade-off problem of system complexity, and greatly simplify the system hardware at the cost of sacrificing a certain time resolution. The basic rules and design methods of asynchronous rotation scan are investigated The Gridding method is introduced to inverse the spiral sampling data for image reconstruction. The potential ap-plications of geostationary orbit (GEO) earth observation and solar polar orbit (SPO) plasma cloud observation are explored with numerical simulations to validate the significance and feasibility of this new imaging configuration.

  4. Asynchronous Session Types – Exceptions and Multiparty Interactions

    DEFF Research Database (Denmark)

    Carbone, Marco; Yoshida, Nobuko; Honda, Kohei

    2009-01-01

    to capture many real scenarios, there are cases where they are not powerful enough for describing and validating interactions involving more complex scenarios. In this note, we shall explore two extensions of session types to interactional exceptions and multiparty session in presence of asynchronous...

  5. RELAXED ASYNCHRONOUS ITERATIONS FOR THE LINEAR COMPLEMENTARITY PROBLEM

    Institute of Scientific and Technical Information of China (English)

    Zhong-zhi Bai; Yu-guang Huang

    2002-01-01

    We present a class of relaxed asynchronous parallel multisplitting iterative methods forsolving the linear complementarity problem on multiprocessor systems, and set up theirconvergence theories when the system matrix of the linear complementarity problem is anH-matrix with positive diagonal elements.

  6. Teachers of the Gifted: Experiences with Asynchronous Development

    Science.gov (United States)

    Rosenberg, Jennifer

    2012-01-01

    Gifted students' development is asynchronous in the social, emotional, physical and cognitive domains. Because of this, unique interventions must be used by teachers of the gifted in order to best serve their developmental and educational needs. This qualitative study used transcendental phenomenology to examine and describe the experiences…

  7. An Asynchronous Electric Drive with the Indirect Control of the Output Variables

    Directory of Open Access Journals (Sweden)

    Glazachev Alexander V.

    2017-01-01

    Full Text Available The article gives a mathematical description of an asynchronous motor with a device of indirect control of the electromagnetic torque and the angular velocity of the asynchronous motor in the electric drive that allows to prove on its basis the method of monitoring the output variables of the asynchronous electric motor. The simulation model of an asynchronous motor with a device of indirect control of the output variables of the asynchronous motor and the main results of the study have been given.

  8. How the Website Usability Elements Impact Performance

    Science.gov (United States)

    Aljukhadar, Muhammad; Senecal, Sylvain

    This research builds on the results of a large scale study in which participants performed an informational task on one of 59 websites spanning various industries to examine how the website usability elements (graphical attractiveness, information, interactivity, trust, and ease of use) drive users’ attitudes and intentions toward the website and how these effects vary according to site experience and end product tangibility. Results show that while the effects of site interactivity and graphical attractiveness were more influential for services sites, the effects of site information and trust were stronger for tangibles sites. Alternatively, compared to returning site visitors, first-time visitors perceived the website as less easy to use, needed more time to accomplish the online task, and based positive attitudes and intentions more strongly on the site information and interactivity. The results of a second study performed in a proximate culture largely corroborate these findings.

  9. Web Usability Policies/Standards/Guidelines Do Not Influence Practices at ARL Academic Libraries. A Review of: Chen, Yu‐Hui, Carol Anne Germain and Huahai Yang. “An Exploration into the Practices of Library Web Usability in ARL Academic Libraries.” Journal of the American Society for Information Science and Technology 60.5 (2009: 953‐68.

    Directory of Open Access Journals (Sweden)

    Shandra Protzko

    2009-12-01

    Full Text Available Objective – To survey the current status of Web usability Policies/Standards/Guidelines (PSGs found in academic libraries of the Association of Research Libraries (ARL. Researchers sought to investigate whether PSGs are in place, the levels of difficulty surrounding implementation, the impact of PSGs on design, testing, and resource allocation, and the relationship between ARL ranking and usability practice or PSGs.Design – Survey.Setting – North America.Subjects – Academic libraries of the ARL.Methods – An 18‐question survey consisting of multiple choice, Likert scale, and open‐ended questions was sent to all 113 ARL libraries in November 2007. Survey recipients were selected as the person in charge of Web site usability by visiting library Web sites and phone inquiry. The survey was concluded in January 2008 with a response rate of 74% (84 institutions. The researchers used t‐test to detect any difference in ARL library ranking between libraries with and without PSGs. Pair‐wise t‐tests were conducted to identify gaps in difficulty implementing PSGs. In addition, they used Pearson’s Correlation to investigate any significant correlations between variables such as ARL rank and resource allocation.Main Results – Of the 84 respondents, 34 (40% have general library Web PSGs and 25 (30% have specific usability PSGs; 41 (49% have at least one type of in‐library PSG. Of the 43 (51% libraries that do not have PSGs, 30 (36% are at universities with institutional Web usability PSGs; 26 (87% follow those guidelines. There was no statistically significant relationship between ARL ranking and PSG status (see Table 1. The authors asked about difficulty in implementing PSGs. Of the 32 libraries responding to a question about general library Web PSGs, most had slight or moderate difficulty. Twenty‐three libraries with specific usability PSGs identified difficulty levels; some had no difficulty, but a majority had moderate difficulty

  10. Usability evaluation: results from "Evaluation of mobile information technology to improve nurses' access to and use of research evidence".

    Science.gov (United States)

    Di Pietro, Tammie Leigh; Nguyen, Ha; Doran, Diane M

    2012-08-01

    Usability evaluations are necessary to determine the feasibility of nurses' interactions with computerized clinical decision-support systems. Limitations and challenges of operations that inhibit or facilitate utilization in clinical practice can be identified. This study provided nurses with mobile information terminals, PDAs and tablet PCs, to improve point-of-care access to information. The purpose of this study was to determine usability issues associated with point-of-care technology. Eleven nurses were self-selected. Nurses were videotaped and audiotaped completing four tasks, including setting up the device and three resource search exercises. A research team member completed a usability checklist. Completion times for each task, success rate, and challenges experienced were documented. Four participants completed all tasks, with an average time of 3 minutes 22 seconds. Three participants were unable to complete any of the three tasks. Navigating within resources caused the greatest occurrence of deviations with 39 issues among all participants. Results of the usability evaluation suggest that nurses require a device that (1) is manageable to navigate and (2) utilizes a user-friendly interface, such as a one-time log-in system. Usability testing can be helpful to organizations as they document issues to be cognizant of during the implementation process, increasing the potential for successful implementation and sustained usability.

  11. Earthdata Search Client: Usability Review Process, Results, and Implemented Changes, Using Earthdata Search Client as a Case Study

    Science.gov (United States)

    Siarto, Jeff; Reese, Mark; Shum, Dana; Baynes, Katie

    2016-01-01

    User experience and visual design are greatly improved when usability testing is performed on a periodic basis. Design decisions should be tested by real users so that application owners can understand the effectiveness of each decision and identify areas for improvement. It is important that applications be tested not just once, but as a part of a continuing process that looks to build upon previous tests. NASA's Earthdata Search Client has undergone a usability study to ensure its users' needs are being met and that users understand how to use the tool efficiently and effectively. This poster will highlight the process followed for usability study, the results of the study, and what has been implemented in light of the results to improve the application's interface.

  12. Usability Dimensions for Mobile Applications-A Review

    Directory of Open Access Journals (Sweden)

    Rosnita Baharuddin

    2013-02-01

    Full Text Available Usability has been increasingly recognized as a significant quality dimension to determine the success of mobile applications. Due to its importance, a number of usability guidelines have been proposed to direct the design of usable applications. The guidelines are intended particularly for desktop and web-based applications. Mobile applications on the other hand are different in many ways from those applications due to the mobility nature of mobile devices. To date, the usability guidelines for mobile applications are very limited. They in fact are isolated, which makes usability evaluation for mobile devices more difficult. This study aims to address this issue by proposing a set of usability dimensions that should be considered for designing and evaluating mobile applications. The dimensions are illustrated as a model that considers four contextual factors: user, environment, technology and task/activity. The model was proposed based on the reviews of previous related studies, which were analyzed by using content analysis approach. Twenty-five dimensions were found from the analysis. The dimensions however were synthesized and prioritized based on their importance towards designing usable mobile applications. As a result, ten most important dimensions were outlined in the model. The model can be used by practitioners and researchers as a guideline to design usable mobile applications and further research can be conducted in the near future.

  13. Information users and usability in the digital age

    CERN Document Server

    Chowdhury, G G

    2013-01-01

    Gives an overview of the necessary issues relating to information users and the usability of information services in the digital world, including user-centred design, and the characteristics and behaviour of information users. This book helps readers understand why information users and the usability of information services are important.

  14. Case studies on analyzing software architectures for usability

    NARCIS (Netherlands)

    Folmer, E; Bosch, J

    2005-01-01

    Studies of software engineering projects reveal that a large number of usability related change requests are made after its deployment. Fixing certain usability problems during. the later stages of development has proven to be costly, since some of these changes require changes to the software archi

  15. 36 CFR 1193.21 - Accessibility, usability, and compatibility.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 3 2010-07-01 2010-07-01 false Accessibility, usability, and compatibility. 1193.21 Section 1193.21 Parks, Forests, and Public Property ARCHITECTURAL AND TRANSPORTATION... Accessibility, usability, and compatibility. Where readily achievable, telecommunications equipment and...

  16. Evaluating the Usability of a Museum Web Site.

    Science.gov (United States)

    Harms, Ilse; Schweibenz, Werner

    This paper presents a research project conducted by the Department of Information Science in cooperation with the Saarland Museum, the art museum of the Federal State of Saarland, Germany. The study had two aims. The first was to evaluate some methods of usability engineering for the Web, and the second was to evaluate the usability of the…

  17. Usability Evaluation of the Student Centered e-Learning Environment

    Science.gov (United States)

    Junus, Inas Sofiyah; Santoso, Harry Budi; Isal, R. Yugo K.; Utomo, Andika Yudha

    2015-01-01

    Student Centered e-Learning Environment (SCeLE) has substantial roles to support learning activities at Faculty of Computer Science, Universitas Indonesia (Fasilkom UI). Although it has been utilized for about 10 years, the usability aspect of SCeLE as an e-Learning system has not been evaluated. Therefore, the usability aspects of SCeLE Fasilkom…

  18. Post-deployment usability evaluation of a radiology workstation

    NARCIS (Netherlands)

    Jorritsma, Wiard; Cnossen, Fokie; Dierckx, Rudi A.; Oudkerk, Matthijs; Van Ooijen, Peter M. A.

    2016-01-01

    Objectives: To determine the number, nature and severity of usability issues radiologists encounter while using a commercially available radiology workstation in clinical practice, and to assess how well the results of a pre-deployment usability evaluation of this workstation generalize to clinical

  19. Evaluating Usability in a Distance Digital Systems Laboratory Class

    Science.gov (United States)

    Kostaras, N.; Xenos, M.; Skodras, A. N.

    2011-01-01

    This paper presents the usability evaluation of a digital systems laboratory class offered to distance-learning students. It details the way in which students can participate remotely in such a laboratory, the methodology employed in the usability assessment of the laboratory infrastructure (hardware and software), and also outlines the main…

  20. A Usability Evaluation of Academic Virtual Reference Services

    Science.gov (United States)

    Chow, Anthony S.; Croxton, Rebecca A.

    2014-01-01

    This study examined the usability of five virtual reference services--instant messenger chat, e-mail, telephone, text messaging, and Skype videoconferencing--by having 31 undergraduate and graduate students evaluate the usability of the virtual reference services of two different universities. The study's results suggest that user preference and…

  1. Usability and Utility of a Mobile Application for Marksmanship Training

    Science.gov (United States)

    utilize anytime, anywhere self-directed training and to determine the utility and usability of embedding small arms coaching training in future weapons...necessarily conduct anytime, anywhere self-directed training. Usability questionnaires and focus group discussions indicate that the soldiers prefer a

  2. Training Software Developers and Designers to Conduct Usability Evaluations

    Science.gov (United States)

    Skov, Mikael Brasholt; Stage, Jan

    2012-01-01

    Many efforts to improve the interplay between usability evaluation and software development rely either on better methods for conducting usability evaluations or on better formats for presenting evaluation results in ways that are useful for software designers and developers. Both of these approaches depend on a complete division of work between…

  3. Users Views about the Usability of Digital Libraries

    Science.gov (United States)

    Koohang, Alex; Ondracek, James

    2005-01-01

    This study examined users' views about the usability of digital libraries' current and perceived importance. Age, gender, prior experience with the Internet, college status, and digital library proficiency are the independent variables. Users' current views about the usability of digital libraries and users perceived importance of digital library…

  4. Post-deployment usability evaluation of a radiology workstation

    NARCIS (Netherlands)

    Jorritsma, Wiard; Cnossen, Fokie; Dierckx, Rudi; Oudkerk, Matthijs; van Ooijen, Peter

    2015-01-01

    Objective To evaluate the usability of a radiology workstation after deployment in a hospital. Significance In radiology, it is difficult to perform valid pre-deployment usability evaluations due to the heterogeneity of the user group, the complexity of the radiological workflow, and the complexity

  5. Usability: Formalising (un)definedness in typed lambda calculu

    NARCIS (Netherlands)

    Kuper, J.; Pacholski, L.; Tiuryn, J.

    1995-01-01

    In this paper we discuss usability, and propose to take that notion as a formalisation of (un)definedness in typed lambda calculus, especially in calculi based on PCF. We discuss some important properties that make usability attractive as a formalisation of (un)definedness. There is a remarkable dif

  6. Virtual Environment Usability Assessment Methods Based on a Framework of Usability Characteristics

    OpenAIRE

    Swartz, Kent Olen

    2003-01-01

    Developing economical yet effective methods of incorporating usability engineering as an integral part of software engineering is a primary focus of human-computer interaction (HCI) research. However, much HCI research has focused primarily on inspecting and evaluating applications supporting command-line or graphical user interface (GUI) interaction styles. With the dramatic increase in virtual environment (VE) research in recent years, the HCI community is beginning to place an added ...

  7. Fast Simulation of Mechanical Heterogeneity in the Electrically Asynchronous Heart Using the MultiPatch Module.

    Directory of Open Access Journals (Sweden)

    John Walmsley

    2015-07-01

    Full Text Available Cardiac electrical asynchrony occurs as a result of cardiac pacing or conduction disorders such as left bundle-branch block (LBBB. Electrically asynchronous activation causes myocardial contraction heterogeneity that can be detrimental for cardiac function. Computational models provide a tool for understanding pathological consequences of dyssynchronous contraction. Simulations of mechanical dyssynchrony within the heart are typically performed using the finite element method, whose computational intensity may present an obstacle to clinical deployment of patient-specific models. We present an alternative based on the CircAdapt lumped-parameter model of the heart and circulatory system, called the MultiPatch module. Cardiac walls are subdivided into an arbitrary number of patches of homogeneous tissue. Tissue properties and activation time can differ between patches. All patches within a wall share a common wall tension and curvature. Consequently, spatial location within the wall is not required to calculate deformation in a patch. We test the hypothesis that activation time is more important than tissue location for determining mechanical deformation in asynchronous hearts. We perform simulations representing an experimental study of myocardial deformation induced by ventricular pacing, and a patient with LBBB and heart failure using endocardial recordings of electrical activation, wall volumes, and end-diastolic volumes. Direct comparison between simulated and experimental strain patterns shows both qualitative and quantitative agreement between model fibre strain and experimental circumferential strain in terms of shortening and rebound stretch during ejection. Local myofibre strain in the patient simulation shows qualitative agreement with circumferential strain patterns observed in the patient using tagged MRI. We conclude that the MultiPatch module produces realistic regional deformation patterns in the asynchronous heart and that

  8. Influence of Adopting a Text-Free User Interface on the Usability of a Web-based Government System with Illiterate and Semi-Literate People

    Directory of Open Access Journals (Sweden)

    Ghadam Alduhailan

    2016-08-01

    Full Text Available Illiterate and semi-literate people usually face different types of difficulties when they use the Internet, such as reading and recognising text. This research aims to develop and examine the influence of adopting a text-free user interface on the usability of a web-based government system with illiterate and semi-literate people. A number of steps have been followed in order to achieve this research goal. An extensive literature review has been carried out to explore the adoption of different concepts or representations of content to help illiterate/semi-literate people in Information and Communication Technology (ICT projects. Then a consolidated framework is proposed and adopted in order to develop a text-free user interface. This can help in building a text-free user interface for a certain service here in Saudi Arabia. Cultural factors, education level, text-free icons, and usability guidelines have been considered in the above-mentioned framework. A prototype of a web-based government system after taking into account the above framework has been designed and developed. Usability testing and heuristic evaluation have been used as usability assessment methods in order to evaluate the system usability and its impact on the usability for illiterate people in Saudi Arabia. The results are encouraging as the achieved results of usability measures imply that adopting the consolidated framework has influenced the usability in this research.

  9. Naive (commonsense) geography and geobrowser usability after ten years of Google Earth

    Science.gov (United States)

    Hamerlinck, J. D.

    2016-04-01

    In 1995, the concept of ‘naive geography’ was formally introduced as an area of cognitive geographic information science representing ‘the body of knowledge that people have about the surrounding geographic world’ and reflecting ‘the way people think and reason about geographic space and time, both consciously and subconsciously’. The need to incorporate such commonsense knowledge and reasoning into design of geospatial technologies was identified but faced challenges in formalizing these relationships and processes in software implementation. Ten years later, the Google Earth geobrowser was released, marking the beginning of a new era of open access to, and application of, geographic data and information in society. Fast-forward to today, and the opportunity presents itself to take stock of twenty years of naive geography and a decade of the ubiquitous virtual globe. This paper introduces an ongoing research effort to explore the integration of naive (or commonsense) geography concepts in the Google Earth geobrowser virtual globe and their possible impact on Google Earth's usability, utility, and usefulness. A multi-phase methodology is described, combining usability reviews and usability testing with use-case scenarios involving the U.S.-Canadian Yellowstone to Yukon Initiative. Initial progress on a usability review combining cognitive walkthroughs and heuristics evaluation is presented.

  10. A proposal for a repertory-grid study of differences in Chinese, Danish, and Indian conceptions of usability: Cultural usability?

    DEFF Research Database (Denmark)

    Hertzum, Morten

    2006-01-01

    This is an unrefined proposal for a study that could form part of the exploratory phase of the Cultural Usability project. The proposed study compares three cultures (Chinese, Danish, and Indian) and two stakeholder groups (users and developers) with respect to their conceptions of usability....

  11. On the Concepts of Usability and Reusability of Learning Objects

    Directory of Open Access Journals (Sweden)

    Miguel-Angel Sicilia

    2003-10-01

    Full Text Available “Reusable learning objects” oriented towards increasing their potential reusability are required to satisfy concerns about their granularity and their independence of concrete contexts of use. Such requirements also entail that the definition of learning object “usability,” and the techniques required to carry out their “usability evaluation” must be substantially different from those commonly used to characterize and evaluate the usability of conventional educational applications. In this article, a specific characterization of the concept of learning object usability is discussed, which places emphasis on “reusability,” the key property of learning objects residing in repositories. The concept of learning object reusability is described as the possibility and adequacy for the object to be usable in prospective educational settings, so that usability and reusability are considered two interrelated – and in many cases conflicting – properties of learning objects. Following the proposed characterization of two characteristics or properties of learning objects, a method to evaluate usability of specific learning objects will be presented.

  12. Decision Based Development of Productline: A Quintessence Usability Approach

    Directory of Open Access Journals (Sweden)

    R. V.S. Balan

    2011-01-01

    Full Text Available Problem statement: A well designed user interface is comprehensible and controllable, helping users to complete their work successfully and efficiently and to feel competent and satisfied. To improve the usability of a software system, usability patterns can be applied. However, there are short comes shows that the software architecture of a system restricts certain usability patterns from being modified after implementation. Several of these usability patterns are “architecture sensitive”, such modifications are costly to implement due through their structural impact on the system. So we practice the pattern oriented usability design with considering the dependencies between the design decisions relevant to the product line business objects which has its impact on the usability criterion. Dependencies between the rationale decisions for the architecture sensitive usability patterns can be maintained for future reference. Approach: While going for the usability patterns, the decisions behind the pattern selection should be specified. We address the issues by analyzing the quality based models that determines the design rationale and their dependencies. We use QDK methodology to preserve the specifications of decisions and all their inter dependencies along with the knowledge rule. Results: Preserving the specifications of decisions and all their inter dependencies with knowledge rules will support the evolution and maintenance of such productline systems. Explicit evaluation of usability during architectural design prevents part of the high costs incurred by adaptive maintenance activities once the system has been implemented. Conclusion: Capturing knowledge by this means provides the basis for justification, learning and re-uses of the knowledge rules for further design decisions.

  13. 77 FR 28853 - Proposed Information Collection; Comment Request; Generic Clearance for Usability Data Collections

    Science.gov (United States)

    2012-05-16

    ... Clearance for Usability Data Collections AGENCY: National Institute of Standards and Technology (NIST... data collections will be designed to determine requirement and evaluate the usability and utility...

  14. The usability of digestate in organic farming.

    Science.gov (United States)

    Clements, L J; Salter, A M; Banks, C J; Poppy, G M

    2012-01-01

    As organic farming prohibits the use of synthetic fertilisers, animal slurries and manures must be used. Digestate offers an alternative to these and this study reports on three experiments conducted to determine its usability in terms of: (1) the effect on earthworm populations, (2) its fertilising effects on Italian Ryegrass and wild Creeping Thistle, and (3) the suppression effects digestate has on weed emergence. The results for digestate application to field plots were intermediate between slurry and no treatment for earthworm attraction and wild thistle suppression. In glasshouse trials it led to increased ryegrass growth compared with undigested slurry. Analysis showed that the digestate had improved nitrogen availability, leading to increased plant growth, but a reduced organic matter content compared with the slurry, leading to a positive though less beneficial impact on the earthworms. Digestate therefore provides a suitable fertiliser for organic farming. This suitability could be improved by drying or separation to increase the OM content making its properties closer to those of slurry whilst still retaining the higher content of plant available nitrogen.

  15. A Concise and Practical Framework for the Development and Usability Evaluation of Patient Information Websites

    Science.gov (United States)

    Knijnenburg, S.L.; Kremer, L.C.; Jaspers, M.W.M.

    2015-01-01

    Summary Background The Website Developmental Model for the Healthcare Consumer (WDMHC) is an extensive and successfully evaluated framework that incorporates user-centered design principles. However, due to its extensiveness its application is limited. In the current study we apply a subset of the WDMHC framework in a case study concerning the development and evaluation of a website aimed at childhood cancer survivors (CCS). Objective To assess whether the implementation of a limited subset of the WDMHC-framework is sufficient to deliver a high-quality website with few usability problems, aimed at a specific patient population. Methods The website was developed using a six-step approach divided into three phases derived from the WDMHC: 1) information needs analysis, mock-up creation and focus group discussion; 2) website prototype development; and 3) heuristic evaluation (HE) and think aloud analysis (TA). The HE was performed by three double experts (knowledgeable both in usability engineering and childhood cancer survivorship), who assessed the site using the Nielsen heuristics. Eight end-users were invited to complete three scenarios covering all functionality of the website by TA. Results The HE and TA were performed concurrently on the website prototype. The HE resulted in 29 unique usability issues; the end-users performing the TA encountered eleven unique problems. Four issues specifically revealed by HE concerned cosmetic design flaws, whereas two problems revealed by TA were related to website content. Conclusion Based on the subset of the WDMHC framework we were able to deliver a website that closely matched the expectancy of the end-users and resulted in relatively few usability problems during end-user testing. With the successful application of this subset of the WDMHC, we provide developers with a clear and easily applicable framework for the development of healthcare websites with high usability aimed at specific medical populations. PMID:26171083

  16. Students' Activity Focus in Online Asynchronous Peer Learning Forums

    Directory of Open Access Journals (Sweden)

    Naomi BOYER

    2010-04-01

    Full Text Available This qualitative study explores how using Peer Learning Forums (PLF in an online asynchronous computer programming course can be analyzed to derive information about Student Activity Focus (SAF for adult Information Technology students. Three instruments are proposed to assist instructors classify questions posted by students on these forums, obtain easy quantitative measures of their SAF, and use it to gain a better understanding of the type of learning barriers they are encountering. In addition, we also look at the difference in SAF between passing and failing students based on their exam performance. The PLF learning activity and the classification instruments are easily adaptable to other disciplines or courses and allow instructors and students alike to gain a better understanding of what kind of participation is helpful in online asynchronous discussion forums.

  17. Channel Estimation And Multiuser Detection In Asynchronous Satellite Communications

    CERN Document Server

    Chaouech, Helmi; 10.5121/ijwmn.2010.2411

    2010-01-01

    In this paper, we propose a new method of channel estimation for asynchronous additive white Gaussian noise channels in satellite communications. This method is based on signals correlation and multiuser interference cancellation which adopts a successive structure. Propagation delays and signals amplitudes are jointly estimated in order to be used for data detection at the receiver. As, a multiuser detector, a single stage successive interference cancellation (SIC) architecture is analyzed and integrated to the channel estimation technique and the whole system is evaluated. The satellite access method adopted is the direct sequence code division multiple access (DS CDMA) one. To evaluate the channel estimation and the detection technique, we have simulated a satellite uplink with an asynchronous multiuser access.

  18. Inference of asynchronous Boolean network from biological pathways.

    Science.gov (United States)

    Das, Haimabati; Layek, Ritwik Kumar

    2015-01-01

    Gene regulation is a complex process with multiple levels of interactions. In order to describe this complex dynamical system with tractable parameterization, the choice of the dynamical system model is of paramount importance. The right abstraction of the modeling scheme can reduce the complexity in the inference and intervention design, both computationally and experimentally. This article proposes an asynchronous Boolean network framework to capture the transcriptional regulation as well as the protein-protein interactions in a genetic regulatory system. The inference of asynchronous Boolean network from biological pathways information and experimental evidence are explained using an algorithm. The suitability of this paradigm for the variability of several reaction rates is also discussed. This methodology and model selection open up new research challenges in understanding gene-protein interactive system in a coherent way and can be beneficial for designing effective therapeutic intervention strategy.

  19. State assignment approach to asynchronous CMOS circuit design

    Science.gov (United States)

    Kantabutra, Vitit; Andreou, Andreas G.

    1994-04-01

    We present a new algorithm for state assignment in asynchronous circuits so that for each circuit state transition, only one (secondary) state variable switches. No intermediate unstable states are used. The resultant circuits operate at optimum speed in terms of the number of transitions made and use only static CMOS gates. By reducing the number of switching events per state transition, noise due to the switching events is reduced and dynamic power dissipation may also be reduced. Our approach is suitable for asynchronous sequential circuits that are designed from flow tables or state transition diagrams. The proposed approach may also be useful for designing synchronous circuits, but explorations into the subject of clock power would be necessary to determine its usefulness.

  20. Workshop on cultural usability and human work interaction design

    DEFF Research Database (Denmark)

    Clemmensen, Torkil; Ørngreen, Rikke; Roese, Kerstin

    2008-01-01

    This workshop analyzes the use of techniques to connect empirical work analysis and interaction design in different cultural contexts. In industry, a wealth of usability evaluation methods is used to evaluate computer software user interfaces and other interactive products: Inspection methods...... it into interaction design. The workshop will present current research into cultural usability and human work interaction design. Cultural usability is a comprehensive concept, which adheres to all kinds of contexts in which humans are involved (private family, work, public and private organizations, nature...

  1. Visual and Auditory Components in the Perception of Asynchronous Audiovisual Speech.

    Science.gov (United States)

    García-Pérez, Miguel A; Alcalá-Quintana, Rocío

    2015-12-01

    Research on asynchronous audiovisual speech perception manipulates experimental conditions to observe their effects on synchrony judgments. Probabilistic models establish a link between the sensory and decisional processes underlying such judgments and the observed data, via interpretable parameters that allow testing hypotheses and making inferences about how experimental manipulations affect such processes. Two models of this type have recently been proposed, one based on independent channels and the other using a Bayesian approach. Both models are fitted here to a common data set, with a subsequent analysis of the interpretation they provide about how experimental manipulations affected the processes underlying perceived synchrony. The data consist of synchrony judgments as a function of audiovisual offset in a speech stimulus, under four within-subjects manipulations of the quality of the visual component. The Bayesian model could not accommodate asymmetric data, was rejected by goodness-of-fit statistics for 8/16 observers, and was found to be nonidentifiable, which renders uninterpretable parameter estimates. The independent-channels model captured asymmetric data, was rejected for only 1/16 observers, and identified how sensory and decisional processes mediating asynchronous audiovisual speech perception are affected by manipulations that only alter the quality of the visual component of the speech signal.

  2. Marine Forces Reserve: Accelerating Knowledge Flow through Asynchronous Learning Technologies

    Science.gov (United States)

    2014-12-19

    pedagogic techniques that are infeasible in the classroom , and they suggest that in some respects technologically intermediated learning can be even better...frameworks and technologies to examine I-I knowledge flows, and from the practitioner perspective, we bring to bear deep inside knowledge of the focal...ASYNCHRONOUS LEARNING TECHNOLOGIES by Mark Nissen, Robert McGuiness and Anthony Davis December 2014 Further distribution of all or part of this

  3. PersisDroid: Android Performance Diagnosis via Anatomizing Asynchronous Executions

    OpenAIRE

    Kang, Yu; Zhou, Yangfan; Xu, Hui; Lyu, Michael R.

    2015-01-01

    Android applications (apps) grow dramatically in recent years. Apps are user interface (UI) centric typically. Rapid UI responsiveness is key consideration to app developers. However, we still lack a handy tool for profiling app performance so as to diagnose performance problems. This paper presents PersisDroid, a tool specifically designed for this task. The key notion of PersisDroid is that the UI-triggered asynchronous executions also contribute to the UI performance, and hence its perform...

  4. Pipelined asynchronous time-division multiplexing optical bus

    Science.gov (United States)

    Zheng, S. Q.; Li, Yueming

    1997-12-01

    We propose a pipelined asynchronous time-division multiplexing optical bus. Such a bus can use one of two hardwared priority schemes: the linear priority scheme and the round-robin priority scheme. Our simulation results show that the performance of the proposed bus is significantly better than the performances of known pipelined synchronous time-division multiplexing optical buses. The possibilities of using our buses to construct multichannel switches and multidimensional processor arrays are also discussed.

  5. Financial Data Modeling by Using Asynchronous Parallel Evolutionary Algorithms

    Institute of Scientific and Technical Information of China (English)

    Wang Chun; Li Qiao-yun

    2003-01-01

    In this paper, the high-level knowledge of financial data modeled by ordinary differential equations (ODEs) is discovered in dynamic data by using an asynchronous parallel evolutionary modeling algorithm (APHEMA). A numerical example of Nasdaq index analysis is used to demonstrate the potential of APHEMA. The results show that the dynamic models automatically discovered in dynamic data by computer can be used to predict the financial trends.

  6. IDENTIFICATION AND CONTROL OF AN ASYNCHRONOUS MACHINE USING NEURAL NETWORKS

    Directory of Open Access Journals (Sweden)

    A ZERGAOUI

    2000-06-01

    Full Text Available In this work, we present the application of artificial neural networks to the identification and control of the asynchronous motor, which is a complex nonlinear system with variable internal dynamics.  We show that neural networks can be applied to control the stator currents of the induction motor.  The results of the different simulations are presented to evaluate the performance of the neural controller proposed.

  7. Asynchronous Transfer Mode (ATM) Switch Technology and Vendor Survey

    Science.gov (United States)

    Berry, Noemi

    1995-01-01

    Asynchronous Transfer Mode (ATM) switch and software features are described and compared in order to make switch comparisons meaningful. An ATM switch's performance cannot be measured solely based on its claimed switching capacity; traffic management and congestion control are emerging as the determining factors in an ATM network's ultimate throughput. Non-switch ATM products and experiences with actual installations of ATM networks are described. A compilation of select vendor offerings as of October 1994 is provided in chart form.

  8. Synthèse automatique de circuits asynchrones QDI

    OpenAIRE

    DINH DUC, Anh Vu

    2003-01-01

    ISBN 2-84813-010-5; Contrary to the synchronous circuits, the asynchronous circuits operate with a mechanism of local synchronization (without clock signal). Since many years, they showed their relevance with respect to the synchronous circuits thanks to their properties of robustness, low power, low noise and modularity. However, the current lack of design methods and associated tools prevents them from being widely spread. This dissertation deals with a new design methodology for quasi-dela...

  9. Diversity Multiplexing Tradeoff of Asynchronous Cooperative Relay Networks

    CERN Document Server

    Krishnakumar, R N; Kumar, P Vijay

    2008-01-01

    The assumption of nodes in a cooperative communication relay network operating in synchronous fashion is often unrealistic. In the present paper, we consider two different models of asynchronous operation in cooperative-diversity networks experiencing slow fading and examine the corresponding diversity-multiplexing tradeoffs (DMT). For both models, we propose protocols and distributed space-time codes that asymptotically achieve the transmit diversity bound for all multiplexing gains and for any number of relays.

  10. Earthdata User Interface Patterns: Building Usable Web Interfaces Through a Shared UI Pattern Library

    Science.gov (United States)

    Siarto, J.

    2014-12-01

    As more Earth science software tools and services move to the web--the design and usability of those tools become ever more important. A good user interface is becoming expected and users are becoming increasingly intolerant of websites and web applications that work against them. The Earthdata UI Pattern Library attempts to give these scientists and developers the design tools they need to make usable, compelling user interfaces without the associated overhead of using a full design team. Patterns are tested and functional user interface elements targeted specifically at the Earth science community and will include web layouts, buttons, tables, typography, iconography, mapping and visualization/graphing widgets. These UI elements have emerged as the result of extensive user testing, research and software development within the NASA Earthdata team over the past year.

  11. Asynchronous signal-dependent non-uniform sampler

    Science.gov (United States)

    Can-Cimino, Azime; Chaparro, Luis F.; Sejdić, Ervin

    2014-05-01

    Analog sparse signals resulting from biomedical and sensing network applications are typically non-stationary with frequency-varying spectra. By ignoring that the maximum frequency of their spectra is changing, uniform sampling of sparse signals collects unnecessary samples in quiescent segments of the signal. A more appropriate sampling approach would be signal-dependent. Moreover, in many of these applications power consumption and analog processing are issues of great importance that need to be considered. In this paper we present a signal dependent non-uniform sampler that uses a Modified Asynchronous Sigma Delta Modulator which consumes low-power and can be processed using analog procedures. Using Prolate Spheroidal Wave Functions (PSWF) interpolation of the original signal is performed, thus giving an asynchronous analog to digital and digital to analog conversion. Stable solutions are obtained by using modulated PSWFs functions. The advantage of the adapted asynchronous sampler is that range of frequencies of the sparse signal is taken into account avoiding aliasing. Moreover, it requires saving only the zero-crossing times of the non-uniform samples, or their differences, and the reconstruction can be done using their quantized values and a PSWF-based interpolation. The range of frequencies analyzed can be changed and the sampler can be implemented as a bank of filters for unknown range of frequencies. The performance of the proposed algorithm is illustrated with an electroencephalogram (EEG) signal.

  12. Data Collection for Mobile Group Consumption: An Asynchronous Distributed Approach.

    Science.gov (United States)

    Zhu, Weiping; Chen, Weiran; Hu, Zhejie; Li, Zuoyou; Liang, Yue; Chen, Jiaojiao

    2016-04-06

    Mobile group consumption refers to consumption by a group of people, such as a couple, a family, colleagues and friends, based on mobile communications. It differs from consumption only involving individuals, because of the complex relations among group members. Existing data collection systems for mobile group consumption are centralized, which has the disadvantages of being a performance bottleneck, having single-point failure and increasing business and security risks. Moreover, these data collection systems are based on a synchronized clock, which is often unrealistic because of hardware constraints, privacy concerns or synchronization cost. In this paper, we propose the first asynchronous distributed approach to collecting data generated by mobile group consumption. We formally built a system model thereof based on asynchronous distributed communication. We then designed a simulation system for the model for which we propose a three-layer solution framework. After that, we describe how to detect the causality relation of two/three gathering events that happened in the system based on the collected data. Various definitions of causality relations based on asynchronous distributed communication are supported. Extensive simulation results show that the proposed approach is effective for data collection relating to mobile group consumption.

  13. A novel asynchronous access method with binary interfaces

    Directory of Open Access Journals (Sweden)

    Torres-Solis Jorge

    2008-10-01

    Full Text Available Abstract Background Traditionally synchronous access strategies require users to comply with one or more time constraints in order to communicate intent with a binary human-machine interface (e.g., mechanical, gestural or neural switches. Asynchronous access methods are preferable, but have not been used with binary interfaces in the control of devices that require more than two commands to be successfully operated. Methods We present the mathematical development and evaluation of a novel asynchronous access method that may be used to translate sporadic activations of binary interfaces into distinct outcomes for the control of devices requiring an arbitrary number of commands to be controlled. With this method, users are required to activate their interfaces only when the device under control behaves erroneously. Then, a recursive algorithm, incorporating contextual assumptions relevant to all possible outcomes, is used to obtain an informed estimate of user intention. We evaluate this method by simulating a control task requiring a series of target commands to be tracked by a model user. Results When compared to a random selection, the proposed asynchronous access method offers a significant reduction in the number of interface activations required from the user. Conclusion This novel access method offers a variety of advantages over traditionally synchronous access strategies and may be adapted to a wide variety of contexts, with primary relevance to applications involving direct object manipulation.

  14. Asynchronous Stoichiometric Response in Lithium Iron Phosphate Batteries

    Energy Technology Data Exchange (ETDEWEB)

    Paxton, William A. [State Univ. of New Jersey, Piscataway, NJ (United States); Akdogan, E. Koray [State Univ. of New Jersey, Piscataway, NJ (United States); Savkliyidiz, Ilyas [State Univ. of New Jersey, Piscataway, NJ (United States); Choksi, Ankur U. [State Univ. of New Jersey, Piscataway, NJ (United States); Silver, Scott X. [State Univ. of New Jersey, Piscataway, NJ (United States); Tsakalokos, Thomas [State Univ. of New Jersey, Piscataway, NJ (United States); Zhong, Zhong [Brookhaven National Lab. (BNL), Upton, NY (United States)

    2014-11-11

    The operando energy-dispersive x-ray diffraction (EDXRD) was carried out on a newly formed 8 Ah lithium iron phosphate (LiFePO4) battery with the goal of elucidating the origin of asynchronous phase transformation commonly seen with in situ x-ray diffraction studies. The high-energy photons at the NSLS X17B1 beamline allow for penetration into a fully assembled battery and therefore negate any need for a specially designed in situ cell which often uses modified current collectors to minimize x-ray attenuation. Spatially-and-temporally resolved phase-mapping was conducted with a semiquantitative reference intensity ratio (RIR) analysis to estimate the relative abundance of the delithiated phase. The data show an asynchronous response in the stoichiometry versus the electrochemical profile and suggest limited diffusion in the electrode toward the end of discharge. These results confirm that the asynchronous electrode response is not just limited to specially designed cells but occurs in fully assembled cells alike. We attribute this behavior to be a consequence of performing a local measurement over a wide-area heterogeneous reaction.

  15. Pseudo Asynchronous Level Crossing adc for ecg Signal Acquisition.

    Science.gov (United States)

    Marisa, T; Niederhauser, T; Haeberlin, A; Wildhaber, R A; Vogel, R; Goette, J; Jacomet, M

    2017-02-07

    A new pseudo asynchronous level crossing analogue-to-digital converter (adc) architecture targeted for low-power, implantable, long-term biomedical sensing applications is presented. In contrast to most of the existing asynchronous level crossing adc designs, the proposed design has no digital-to-analogue converter (dac) and no continuous time comparators. Instead, the proposed architecture uses an analogue memory cell and dynamic comparators. The architecture retains the signal activity dependent sampling operation by generating events only when the input signal is changing. The architecture offers the advantages of smaller chip area, energy saving and fewer analogue system components. Beside lower energy consumption the use of dynamic comparators results in a more robust performance in noise conditions. Moreover, dynamic comparators make interfacing the asynchronous level crossing system to synchronous processing blocks simpler. The proposed adc was implemented in [Formula: see text] complementary metal-oxide-semiconductor (cmos) technology, the hardware occupies a chip area of 0.0372 mm(2) and operates from a supply voltage of [Formula: see text] to [Formula: see text]. The adc's power consumption is as low as 0.6 μW with signal bandwidth from [Formula: see text] to [Formula: see text] and achieves an equivalent number of bits (enob) of up to 8 bits.

  16. A Synchronous-Asynchronous Particle Swarm Optimisation Algorithm

    Directory of Open Access Journals (Sweden)

    Nor Azlina Ab Aziz

    2014-01-01

    Full Text Available In the original particle swarm optimisation (PSO algorithm, the particles’ velocities and positions are updated after the whole swarm performance is evaluated. This algorithm is also known as synchronous PSO (S-PSO. The strength of this update method is in the exploitation of the information. Asynchronous update PSO (A-PSO has been proposed as an alternative to S-PSO. A particle in A-PSO updates its velocity and position as soon as its own performance has been evaluated. Hence, particles are updated using partial information, leading to stronger exploration. In this paper, we attempt to improve PSO by merging both update methods to utilise the strengths of both methods. The proposed synchronous-asynchronous PSO (SA-PSO algorithm divides the particles into smaller groups. The best member of a group and the swarm’s best are chosen to lead the search. Members within a group are updated synchronously, while the groups themselves are asynchronously updated. Five well-known unimodal functions, four multimodal functions, and a real world optimisation problem are used to study the performance of SA-PSO, which is compared with the performances of S-PSO and A-PSO. The results are statistically analysed and show that the proposed SA-PSO has performed consistently well.

  17. Health system guidance appraisal-concept evaluation and usability testing

    OpenAIRE

    2016-01-01

    Background Health system guidance (HSG) provides recommendations aimed to address health system challenges. However, there is a paucity of methods to direct, appraise, and report HSG. Earlier research identified 30 candidate criteria (concepts) that can be used to evaluate the quality of HSG and guide development and reporting requirements. The objective of this paper was to describe two studies aimed at evaluating the importance of these 30 criteria, design a draft HSG appraisal tool, and te...

  18. An asynchronous and parallel time-marching method: Application to three-dimensional MHD simulation of solar wind

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    An asynchronous and parallel time-marching method for three-dimensional (3D) time-dependent magnetohydrodynamic (MHD) simulation is used for large-scale solar wind simulation. It uses different local time steps in the corona and the heliosphere according to the local Courant-Friedrichs-Levy (CFL) conditions. The solar wind background with observed solar photospheric magnetic field as input is first presented. The simulation time for the background solar wind by using the asynchronous method is <1/6 of that by using the normal synchronous time-marching method with the same computation precision. Then, we choose the coronal mass ejection (CME) event of 13 November, 2003 as a test case. The time-dependent variations of the pressure and the velocity configured from a CME model at the inner boundary are applied to generate transient structures in order to study the dynamical interaction of a CME with the background solar wind flow between 1 and 230 Rs. This time-marching method is very effective in terms of computation time for large-scale 3D time-dependent numerical MHD problem. In this validation study, we find that this 3D MHD model, with the asynchronous and parallel time-marching method, provides a relatively satisfactory comparison with the ACE spacecraft obser- vations at L1 point.

  19. Availability and Usability of BHO Encounter Data in MAX 2009

    Data.gov (United States)

    U.S. Department of Health & Human Services — Availability and Usability of Behavioral Health Organization Encounter Data in MAX 2009, published in Volume 4, Issue 2 of Medicare and Medicaid Research Review,...

  20. Meta-Analysis of Correlations Among Usability Measures

    DEFF Research Database (Denmark)

    Hornbæk, Kasper Anders Søren; Effie Lai Chong, Law

    2007-01-01

    are generally low: effectiveness measures (e.g., errors) and efficiency measures (e.g., time) has a correlation of .247 ± .059 (Pearson's product-moment correlation with 95% confidence interval), efficiency and satisfaction (e.g., preference) one of .196 ± .064, and effectiveness and satisfaction one of .164......Understanding the relation between usability measures seems crucial to deepen our conception of usability and to select the right measures for usability studies. We present a meta-analysis of correlations among usability measures calculated from the raw data of 73 studies. Correlations...... ± .062. Changes in task complexity do not influence these correlations, but use of more complex measures attenuates them. Standard questionnaires for measuring satisfaction appear more reliable than homegrown ones. Measures of users' perceptions of phenomena are generally not correlated with objective...

  1. COST Action TU1002 - Assessing usability of accessibility instruments

    NARCIS (Netherlands)

    te Brömmelstroet, M.; Silva, C.; Bertolini, L.

    2014-01-01

    The report presents the results of a number of experiential workshops with local planning practitioners. In these workshops, these practitioners, first experienced and then reflected on the usability of accessibility instruments. These workshops were promoted by developers of accessibility instrumen

  2. Assessing the Usability of MAX 2008 Encounter Data

    Data.gov (United States)

    U.S. Department of Health & Human Services — Assessing the Usability of MAX 2008 Encounter Data for Comprehensive Managed Care As growing numbers of Medicaid enrollees receive comprehensive health benefits...

  3. ON THE ISSUE OF VECTOR CONTROL OF THE ASYNCHRONOUS MOTORS

    Directory of Open Access Journals (Sweden)

    B. I. Firago

    2015-01-01

    Full Text Available The paper considers the issue of one of the widespread types of vector control realization for the asynchronous motors with a short-circuited rotor. Of all more than 20 vector control types known presently, the following are applied most frequently: direct vector control with velocity pickup (VP, direct vector control without VP, indirect vector control with VP and indirect vector control without VP. Despite the fact that the asynchronous-motor indirect vector control without VP is the easiest and most spread, the absence of VP does not allow controlling the motor electromagnetic torque at zero velocity. This is the reason why for electric motor drives of such requirements they utilize the vector control with a velocity transducer. The systems of widest dissemination became the direct and indirect vector control systems with X-axis alignment of the synchronously rotating x–y-coordinate frame along the rotor flux-linkage vector inasmuch as this provides the simplest correlations for controlling variables. Although these two types of vector control are well presented in literature, a number of issues concerning their realization and practical application require further elaboration. These include: the block schemes adequate representation as consisted with the modern realization of vector control and clarification of the analytical expressions for evaluating the regulator parameters.The authors present a technique for evaluating the dynamics of an asynchronous electric motor drive with direct vector control and x-axis alignment along the vector of rotor flux linkage. The article offers a generalized structure of this vector control type with detailed description of its principal blocks: controlling system, frequency converter, and the asynchronous motor.The paper presents a direct vector control simulating model developed in the MatLab environment on the grounds of this structure. The authors illustrate the described technique with the results

  4. Systems development methods and usability in Norway: An industrial perspective

    OpenAIRE

    Bygstad, B; G. Ghinea; Brevik, E.

    2007-01-01

    This is the post-print version of the Article. The official published version can be accessed from the link below - Copyright @ 2007 Springer Berlin Heidelberg This paper investigates the relationship between traditional systems development methodologies and usability, through a survey of 78 Norwegian IT companies. Building on previous research we proposed two hypotheses; (1) that software companies will generally pay lip service to usability, but do not prioritize it in industrial project...

  5. Evaluating Usability of E-Learning Systems in Universities

    OpenAIRE

    Nicholas Kipkurui Kiget; Professor G. Wanyembi; Anselemo Ikoha Peters

    2014-01-01

    The use of e-learning systems has increased significantly in the recent times. E-learning systems are supplementing teaching and learning in universities globally. Kenyan universities have adopted e-learning technologies as means for delivering course content. However despite adoption of these systems, there are considerable challenges facing the usability of the systems. Lecturers and students have different perceptions in regard to the usability of e-learning systems. The aim of this study ...

  6. Assessment of the usability of a nutritional epidemiology computerized system

    Directory of Open Access Journals (Sweden)

    Bruna Furer Ferri Ruggeri

    2013-12-01

    Full Text Available INTRODUCTION: Epidemiological research has been adhering to new technologies, such as computer systems, and using the Internet as a tool. Usability is a characteristic of a specific product concerning the facility to use it, its speed and the facility to learn how to use it. It should also not present errors, or these must be easy to solve, in case they occur, thus providing high satisfaction to users. OBJECTIVE: To evaluate the usability of the "System of health and nutrition monitoring - nutrition of school children" (NUTRISIM. METHODS: A sample of 17 Information Technology professionals evaluated the system and answered the "Questionnaire for System Usability", which determines the level of usability of systems by the Fuzzy Logic. The questionnaire contains 30 questions, which are divided into six metrics. The usability of the system determines six usability criteria in a large Fuzzy scale. RESULTS: With the exception of the metric "error control", all metrics were analyzed as "very good". The metrics "error control", "efficiency" and "satisfaction" presented medium amplitude, which is a better result in relation to the metrics "easy to learn", "easy to remember" and "effectiveness", which was assessed as "high". CONCLUSION: The study showed that the system is easy to be learned and used, but the answers are scattered. The instrument proved to be a useful tool to monitor and evaluate health and dietary intake in epidemiologic studies.

  7. Mobile Usability in Educational Contexts: What have we learnt?

    Directory of Open Access Journals (Sweden)

    Agnes Kukulska-Hulme

    2007-06-01

    Full Text Available The successful development of mobile learning is dependent on human factors in the use of new mobile and wireless technologies. The majority of mobile learning activity continues to take place on devices that were not designed with educational applications in mind, and usability issues are often reported. The paper reflects on progress in approaches to usability and on recent developments, with particular reference to usability findings reported in studies of mobile learning. The requirements of education are considered as well as the needs of students participating in distance education; discipline-specific perspectives and accessibility issues are also addressed. Usability findings from empirical studies of mobile learning published in the literature are drawn together in the paper, along with an account of issues that emerged in two mobile learning projects based at The Open University, UK, in 2001 and 2005. The main conclusions are: that usability issues are often reported in cases where PDAs have been used; that the future is in scenario-based design which should also take into account the evolution of uses over time and the unpredictability of how devices might be used; and that usability issues should be tracked over a longer period, from initial use through to a state of relative experience with the technology.

  8. Synthesis and Layout of an Asynchronous Network-on-Chip using Standard EDA Tools

    DEFF Research Database (Denmark)

    Müller, Christoph; Kasapaki, Evangelia; Sørensen, Rasmus Bo;

    2014-01-01

    is the key role that clock signals play in specifying time-constraints for the synthesis. In this paper explain how we handled the synthesis and layout of an asynchronous network-on-chip for a multi-core platform. Focus is on the design process while the actual NOC-design and its performance are presented......Asynchronous circuit design is well understood but design tools supporting asynchronous design are largely lacking, and designers are limited to using conventional EDA-tools. These tools have a built-in synchronous mind-set and this complicates their use for asynchronous implementation. One example...

  9. 36 CFR 1193.39 - Prohibited reduction of accessibility, usability, and compatibility.

    Science.gov (United States)

    2010-07-01

    ... accessibility, usability, and compatibility. 1193.39 Section 1193.39 Parks, Forests, and Public Property... Requirements for Accessibility and Usability § 1193.39 Prohibited reduction of accessibility, usability, and... accessibility, usability, or compatibility of telecommunications equipment or customer premises equipment....

  10. Usability of calcium carbide gas pressure method in hydrological sciences

    Science.gov (United States)

    Arsoy, S.; Ozgur, M.; Keskin, E.; Yilmaz, C.

    2013-10-01

    Soil moisture is a key engineering variable with major influence on ecological and hydrological processes as well as in climate, weather, agricultural, civil and geotechnical applications. Methods for quantification of the soil moisture are classified into three main groups: (i) measurement with remote sensing, (ii) estimation via (soil water balance) simulation models, and (iii) measurement in the field (ground based). Remote sensing and simulation modeling require rapid ground truthing with one of the ground based methods. Calcium carbide gas pressure (CCGP) method is a rapid measurement procedure for obtaining soil moisture and relies on the chemical reaction of the calcium carbide reagent with the water in soil pores. However, the method is overlooked in hydrological science applications. Therefore, the purpose of this study is to evaluate the usability of the CCGP method in comparison with standard oven-drying and dielectric methods in terms of accuracy, time efficiency, operational ease, cost effectiveness and safety for quantification of the soil moisture over a wide range of soil types. The research involved over 250 tests that were carried out on 15 different soil types. It was found that the accuracy of the method is mostly within ±1% of soil moisture deviation range in comparison to oven-drying, and that CCGP method has significant advantages over dielectric methods in terms of accuracy, cost, operational ease and time efficiency for the purpose of ground truthing.

  11. A Survey of Usability Practices in Free/Libre/Open Source Software

    Science.gov (United States)

    Paul, Celeste Lyn

    A review of case studies about usability in eight Free/Libre/Open Source Software (FLOSS) projects showed that an important issue regarding a usability initiative in the project was the lack of user research. User research is a key component in the user-centered design (UCD) process and a necessary step for creating usable products. Reasons why FLOSS projects suffered from a lack of user research included poor or unclear project leadership, cultural differences between developer and designers, and a lack of usability engineers. By identifying these critical issues, the FLOSS usability community can begin addressing problems in the efficacy of usability activities and work towards creating more usable FLOSS products.

  12. A Self-Regulation Theory–Based Asthma Management Mobile App for Adolescents: A Usability Assessment

    Science.gov (United States)

    2017-01-01

    Background Self-regulation theory suggests people learn to influence their own behavior through self-monitoring, goal-setting, feedback, self-reward, and self-instruction, all of which smartphones are now capable of facilitating. Several mobile apps exist to manage asthma; however, little evidence exists about whether these apps employ user-centered design processes that adhere to government usability guidelines for mobile apps. Objective Building upon a previous study that documented adolescent preferences for an asthma self-management app, we employed a user-centered approach to assess the usability of a high-fidelity wireframe for an asthma self-management app intended for use by adolescents with persistent asthma. Methods Individual interviews were conducted with adolescents (ages 11-18 years) with persistent asthma who owned a smartphone (N=8). Adolescents were asked to evaluate a PDF app wireframe consisting of 76 screen shots displaying app features, including log in and home screen, profile setup, settings and info, self-management features, and graphical displays for charting asthma control and medication. Preferences, comments, and suggestions for each set of screen shots were assessed using the audio-recorded interviews. Two coders reached consensus on adolescent evaluations of the following aspects of app features: (1) usability, (2) behavioral intentions to use, (3) confusing aspects, and (4) suggestions for improvement. Results The app wireframe was generally well received, and several suggestions for improvement were recorded. Suggestions included increased customization of charts and notifications, reminders, and alerts. Participants preferred longitudinal data about asthma control and medication use to be displayed using line graphs. All participants reported that they would find an asthma management app like the one depicted in the wireframe useful for managing their asthma. Conclusions Early stage usability tests guided by government usability

  13. Decentralized automatic generation control of interconnected power systems incorporating asynchronous tie-lines.

    Science.gov (United States)

    Ibraheem; Hasan, Naimul; Hussein, Arkan Ahmed

    2014-01-01

    This Paper presents the design of decentralized automatic generation controller for an interconnected power system using PID, Genetic Algorithm (GA) and Particle Swarm Optimization (PSO). The designed controllers are tested on identical two-area interconnected power systems consisting of thermal power plants. The area interconnections between two areas are considered as (i) AC tie-line only (ii) Asynchronous tie-line. The dynamic response analysis is carried out for 1% load perturbation. The performance of the intelligent controllers based on GA and PSO has been compared with the conventional PID controller. The investigations of the system dynamic responses reveal that PSO has the better dynamic response result as compared with PID and GA controller for both type of area interconnection.

  14. Faculty development and mentorship using selected online asynchronous teaching strategies.

    Science.gov (United States)

    Vitale, Anne T

    2010-12-01

    The use of distance learning continues to improve accessibility to nursing education programs, yet online teaching remains an intimidating experience for novice educators. An emerging role in professional faculty development is the online educator, who serves as a mentor for novice faculty. This article presents the necessary elements to plan, organize, and manage asynchronous online courses, especially for novice educators and online faculty mentors. Course engagement and faculty-student online communication strategies are explored using examples. Threaded discussion strategies for engaging students in active, collaborative learning are discussed using specific examples. A threaded discussion grading rubric is included. Strategies to sustain interactive learning and evaluate student learning using examples are offered.

  15. Wind Generator Stabilization with Doubly-Fed Asynchronous Machine

    Institute of Scientific and Technical Information of China (English)

    WU Li; WANG Zhi-xin

    2007-01-01

    This paper investigates the function of doubly-fed asynchronous machine(DASM) with emphasis placed on its ability to the stabilization of the power system including wind generators. P(active power) and Q(reactive power) compensation from DASM can be regulated independently through secondary-excitation controlling. Simulation results by power system computer aided design(PSCAD) show that DASM can restore the wind-generator system to a normal operating condition rapidly even following severe transmission-line failures. Comparison studies have also been performed between wind turbine pitch control and proposed method.

  16. Positive semidefinite integrated covariance estimation, factorizations and asynchronicity

    DEFF Research Database (Denmark)

    Sauri, Orimar; Lunde, Asger; Laurent, Sébastien;

    2017-01-01

    An estimator of the ex-post covariation of log-prices under asynchronicity and microstructure noise is proposed. It uses the Cholesky factorization of the covariance matrix in order to exploit the heterogeneity in trading intensities to estimate the different parameters sequentially with as many...... observations as possible. The estimator is positive semidefinite by construction. We derive asymptotic results and confirm their good finite sample properties by means of a Monte Carlo simulation. In the application we forecast portfolio Value-at-Risk and sector risk exposures for a portfolio of 52 stocks. We...

  17. Negative circuits and sustained oscillations in asynchronous automata networks

    CERN Document Server

    Richard, Adrien

    2009-01-01

    The biologist Ren\\'e Thomas conjectured, twenty years ago, that the presence of a negative feedback circuit in the interaction graph of a dynamical system is a necessary condition for this system to produce sustained oscillations. In this paper, we state and prove this conjecture for asynchronous automata networks, a class of discrete dynamical systems extensively used to model the behaviors of gene networks. As a corollary, we obtain the following fixed point theorem: given a product $X$ of $n$ finite intervals of integers, and a map $F$ from $X$ to itself, if the interaction graph associated with $F$ has no negative circuit, then $F$ has at least one fixed point.

  18. A wavelet approach to binary blackholes with asynchronous multitasking

    Science.gov (United States)

    Lim, Hyun; Hirschmann, Eric; Neilsen, David; Anderson, Matthew; Debuhr, Jackson; Zhang, Bo

    2016-03-01

    Highly accurate simulations of binary black holes and neutron stars are needed to address a variety of interesting problems in relativistic astrophysics. We present a new method for the solving the Einstein equations (BSSN formulation) using iterated interpolating wavelets. Wavelet coefficients provide a direct measure of the local approximation error for the solution and place collocation points that naturally adapt to features of the solution. Further, they exhibit exponential convergence on unevenly spaced collection points. The parallel implementation of the wavelet simulation framework presented here deviates from conventional practice in combining multi-threading with a form of message-driven computation sometimes referred to as asynchronous multitasking.

  19. Product design enhancement using apparent usability and affective quality.

    Science.gov (United States)

    Seva, Rosemary R; Gosiaco, Katherine Grace T; Santos, Ma Crea Eurice D; Pangilinan, Denise Mae L

    2011-03-01

    In this study, apparent usability and affective quality were integrated in a design framework called the Usability Perception and Emotion Enhancement Model (UPEEM). The UPEEM was validated using structural equation modeling (SEM). The methodology consists of four phases namely product selection, attribute identification, design alternative generation, and design alternative evaluation. The first stage involved the selection of a product that highly involves the consumer. In the attribute identification stage, design elements of the product were identified. The possible values of these elements were also determined for use in the experimentation process. Design of experiments was used to identify how the attributes will be varied in the design alternative stage and which of the attributes significantly contribute to affective quality, apparent usability, and desirability in the design evaluation stage. Results suggest that product attributes related to form are relevant in eliciting intense affect and perception of usability in mobile phones especially those directly related to functionality and aesthetics. This study considered only four product attributes among so many due to the constraints of the research design employed. Attributes related to aesthetic perception of a product enhance apparent usability such as those related to dimensional ratios.

  20. Ergonomics of usability/accessibility-ready websites: Tools and guidelines

    Directory of Open Access Journals (Sweden)

    Ali Al-Badi

    2012-12-01

    Full Text Available The 'user-friendliness' of a website indicates to what extent it is easy for all intended users to interact with website to perform their required task(s. Given the explosive growth in the use of computerized systems as well as the World Wide Web for delivering information and services, usability/accessibility becomes an important issue. The purpose of this research is to study the available literature on usability/accessibility ready websites and their tools and guidelines. The research findings will help web engineers to build websites and web services accessible for all the target audience, including people with special needs. People with special needs meet barriers of all types, but computing technology is helping them to overcome these barriers. Accordingly, a great amount of development work has been carried out in the area of designing websites for disabled people, and it is increasingly becoming an important focus for a variety of reasons, legal (due to recent legislation in many countries promoting the rights of disabled people, economic, or ethical. Web engineers are increasingly aware that they need to ensure the usability of mainstream systems for disabled people by developing systems explicitly to meet the needs of disabled users (often referred to as assistive technologies, which also require evaluation to ensure their usability for the target audience. A descriptive/interpretive research method was used for the study of usability, accessibility, globalization, readability and culture differences based on related literatures and on previous studies by academics and industrial institutions.

  1. Usability of a barcode scanning system as a means of data entry on a PDA for self-report health outcome questionnaires

    DEFF Research Database (Denmark)

    Boissy, Patrice; Jacobs, Karen; Roy, Serge H

    2006-01-01

    with a text-to-speech synthesizer to collect data electronically from self-report health outcome questionnaires. METHODS: Usability of the system was tested on a sample of 24 community-living older adults (7 men, 17 women) ranging in age from 63 to 93 years. After receiving a brief demonstration on the use......BACKGROUND: Throughout the medical and paramedical professions, self-report health status questionnaires are used to gather patient-reported outcome measures. The objective of this pilot study was to evaluate in individuals over 60 years of age the usability of a PDA-based barcode scanning system...... of the barcode scanner, participants were randomly assigned to complete two sets of 16 questions using the bar code wand scanner for one set and a pen for the other. Usability was assessed using directed interviews with a usability questionnaire and performance-based metrics (task times, errors, sources...

  2. 基于服务质量的Web服务可用性评价方法%Web Service Usability Evaluation Method Based on the Service Quality

    Institute of Scientific and Technical Information of China (English)

    邓飞; 姜莉; 赵红

    2012-01-01

    To improve the usability of Web service, design an usability testing model based on the degree of usability and proposed an evaluation method for web service, which can help to evaluate the degree of usability of the service quality and provides valueable reference for the service consumers to choose better web service. Experiments showed that this method was flexible and practical.%为提高Web服务的可用性,设计一种基于可用度的web服务可用性测试模型,提出了一种Web服务可用性的评价方法,对服务质量指标进行量化评估,为服务请求者选择最优服务提供参考依据。实验表明,该方法具有很好的灵活性和实用性。

  3. The design of an asynchronous Tiny RISC TM/TR4101 microprocessor core

    DEFF Research Database (Denmark)

    Christensen, Kåre Tais; Jensen, P.; Korger, P.

    1998-01-01

    This paper presents the design of an asynchronous version of the TR4101 embedded microprocessor core developed by LSI Logic Inc. The asynchronous processor, called ARISC, was designed using the same CAD tools and the same standard cell library that was used to implement the TR4101. The paper...

  4. The Key Implementation Technology of Client/Server's Asynchronous Communication Programs

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    This paper introduces the implementation method,key technology and flowchart of Client/Server's asynchronous communication programs on Linux or Unix,and further explains a few problems to which should pay attention for improving CPU's efficiency in implementing asynchronous communication programs.

  5. Using Television Sitcoms to Facilitate Asynchronous Discussions in the Online Communication Course

    Science.gov (United States)

    Tolman, Elizabeth; Asbury, Bryan

    2012-01-01

    Asynchronous discussions are a useful instructional resource in the online communication course. In discussion groups students have the opportunity to actively participate and interact with students and the instructor. Asynchronous communication allows for flexibility because "participants can interact with significant amounts of time between…

  6. A Scheduling Discipline for Latency and Bandwidth Guarantees in Asynchronous Network-on-Chip

    DEFF Research Database (Denmark)

    Bjerregaard, Tobias; Sparsø, Jens

    2005-01-01

    Guaranteed services (GS) are important in that they provide predictability in the complex dynamics of shared communication structures. This paper discusses the implementation of GS in asynchronous Network-on-Chip. We present a novel scheduling discipline called Asynchronous Latency Guarantee (ALG...

  7. Adding effect of current displacement and magnetic circuit saturation in an asynchronous motor mathematical model

    Directory of Open Access Journals (Sweden)

    I.A. Tsodik

    2014-04-01

    Full Text Available A methodology of an asynchronous motor mathematical model synthesis is described. Experiments are suggested to be conducted in the following sequence. Geometrical models are first built in AutoCAD, then imported to Comsol Multiphysics, and further processed in Matlab with computation of coefficients and dependences applied in the asynchronous motor mathematical model.

  8. Exploring the Effect of Scripted Roles on Cognitive Presence in Asynchronous Online Discussions

    Science.gov (United States)

    Olesova, Larisa; Slavin, Margaret; Lim, Jieun

    2016-01-01

    The purpose of this study was to identify the effect of scripted roles on students' level of cognitive presence in asynchronous online threaded discussions. A quantitative content analysis was used to investigate: (1) what level of cognitive presence is achieved by students' assigned roles in asynchronous online discussions; (2) differences…

  9. On Usability of ECDIS Human-machine Interface%ECDIS 人机界面的可用性研究

    Institute of Scientific and Technical Information of China (English)

    王太航; 郑彭军

    2015-01-01

    运用基于任务的 KLM 模型,对 ECDIS 人机界面的2种常见设计方案(基于单文档和基于对话框)执行特定任务所需的操作用时进行了理论预测,然后通过实际测试检验理论预测结果的准确性,进而比较这2种设计方案执行相同特定任务的效率。%Usability is a key indicator to evaluate Human-machine interface (HMI). ECDIS is a typical HMI for e-Navigation. In order to improve the usability of ECDIS HMI, it is necessary to conduct usability test and evaluation. The paper uses the method called Keystroke-level model (KLM) to investigate the time spent on executing typical navigation operations using two common design schemes, which are based on single document and dialog box. In this report, the accuracy of the theoretical prediction is tested against the actual test results, and the efficiency of the two design schemes is compared. The results are expected to provide technical insights for the usability of ECDIS and design of HMI.

  10. Evaluating the Usability of Pinchigator, a system for Navigating Virtual Worlds using Pinch Gloves

    Science.gov (United States)

    Hamilton, George S.; Brookman, Stephen; Dumas, Joseph D. II; Tilghman, Neal

    2003-01-01

    Appropriate design of two dimensional user interfaces (2D U/I) utilizing the well known WIMP (Window, Icon, Menu, Pointing device) environment for computer software is well studied and guidance can be found in several standards. Three-dimensional U/I design is not nearly so mature as 2D U/I, and standards bodies have not reached consensus on what makes a usable interface. This is especially true when the tools for interacting with the virtual environment may include stereo viewing, real time trackers and pinch gloves instead of just a mouse & keyboard. Over the last several years the authors have created a 3D U/I system dubbed Pinchigator for navigating virtual worlds based on the dVise dV/Mockup visualization software, Fakespace Pinch Gloves and Pohlemus trackers. The current work is to test the usability of the system on several virtual worlds, suggest improvements to increase Pinchigator s usability, and then to generalize about what was learned and how those lessons might be applied to improve other 3D U/I systems.

  11. The Influence of Usability on Electronic Customer Relationship Management Performance in Jordan Mobile Phone Services

    Directory of Open Access Journals (Sweden)

    Samsudin Wahab

    2011-12-01

    Full Text Available Electronic Customer Relationship Management performance is a comprehensive business and marketing strategy that integrates people, process, technology and all business activities for attracting and retaining customers over the internet and mobile phone to reduce costs and increase profitability by consolidation the principles of customer loyalty. Therefore, the results of Electronic Customer Relationship Management performance are repeat purchase, word of mouth, retention, cross buying, brand loyalty and customer satisfaction. The keen competitive in the communication and mobile phone service market place and the increasing numbers of mobile phone users all over the world has influence the researcher to investigate usability as the antecedents of electronic customer relationship management performance in mobile phone services industry. Four hundreds and eighty eight set of questionnaires have returned and analyzed. The analysis shows that usability was positively significant towards E-CRM performance. Base on the results, it can be concluded that the mobile service provider has to ensure their services fully satisfied their customer usability. Somehow, future research must investigate other factors as the antecedent for E-CRM performance. Other initiative is to consider a model testing in difference context of electronic service to see any generalization on the research result.

  12. Usability assessment of ASIBOT: a portable robot to aid patients with spinal cord injury.

    Science.gov (United States)

    Jardón, Alberto; Gil, Ángel M; de la Peña, Ana I; Monje, Concepción A; Balaguer, Carlos

    2011-01-01

    The usability concept refers to aspects related to the use of products that are closely linked to the user's degree of satisfaction. Our goal is to present a functional evaluation methodology for assessing the usability of sophisticated technical aids, such as a portable robot for helping disabled patients with severe spinal cord injuries. The specific manipulator used for this task is ASIBOT, a personal assistance robot totally developed by RoboticsLab at the University Carlos III of Madrid. Our purpose is also to improve some aspects of the manipulator according to the user's perception. For our case study, a population of six patients with spinal cord injury is considered. These patients have been suffering spinal cord injuries for a period of time longer than 1 year before the tests are carried out. The methodology followed for the information gathering is based on the Quebec User Evaluation of Satisfaction with assistive Technology (QUEST). Different daily functions, such as drinking, brushing one's teeth and washing one's face, are considered to assess the user's perception when using ASIBOT as a technical aid. The human factor in this procedure is the main base to establish the specific needs and tools to make the end product more suitable and usable.

  13. Mobile PHRs compliance with Android and iOS usability guidelines.

    Science.gov (United States)

    Cruz Zapata, Belén; Hernández Niñirola, Antonio; Idri, Ali; Fernández-Alemán, José Luis; Toval, Ambrosio

    2014-08-01

    Mobile Personal Health Records (PHRs) have achieved a particularly strong market share since the appearance of more powerful mobile devices and popular worldwide mobile application markets such as Apple's App Store and Android's Google Play. However, Android and Apple have a set of recommendations on design and usability targeted towards developers who wish to publish apps in their stores: Android Design Guidelines and iOS Human Interface Guidelines. This paper aims to evaluate compliance with these guidelines by assessing the usability recommendations of a set of 24 selected mobile PHR applications. An analysis process based on a well-known Systematic Literature Review (SLR) protocol was used. The results show that the 24 mobile PHR applications studied are not suitably structured. 46 % of these applications do not use any of the recommended patterns, using instead lists or springboards, which are deprecated patterns for top-level menus. 70 % of the PHRs require a registration to be able to test the application when these interactions should be delayed. Our study will help both PHR users to select user-friendly mobile PHRs and PHR providers and developers to identify the good usability practices implemented by the applications with the highest scores.

  14. Behavioral Synthesis of Asynchronous Circuits Using Syntax Directed Translation as Backend

    DEFF Research Database (Denmark)

    Nielsen, Sune Fallgaard; Sparsø, Jens; Madsen, Jan

    2009-01-01

    The current state-of-the art in high-level synthesis of asynchronous circuits is syntax directed translation, which performs a one-to-one mapping of a HDL-description into a corresponding circuit. This paper presents a method for behavioral synthesis of asynchronous circuits which builds on top...... of syntax directed translation, and which allows the designer to perform automatic design space exploration guided by area or speed constraints. The paper presents an asynchronous implementation template consisting of a data-path and a control unit and its implementation using the asynchronous hardware...... description language Balsa [1]. This ”conventional” template architecture allows us to adapt traditional synchronous synthesis techniques for resource sharing, scheduling, binding etc, to the domain of asynchronous circuits. A prototype tool has been implemented on top of the Balsa framework, and the method...

  15. Usability Study of a Library's Mobile Website: An Example from Portland State University

    Directory of Open Access Journals (Sweden)

    Kimberly D. Pendell

    2012-06-01

    Full Text Available To discover how a newly developed library mobile website performed across a variety of devices, the authors used a hybrid field and laboratory methodology to conduct a usability test of the website. Twelve student participants were recruited and selected according to phone type. Results revealed a wide array of errors attributed to site design, wireless network connections, as well as phone hardware and software. This study provides an example methodology for testing library mobile websites, identifies issues associated with mobile websites, and provides recommendations for improving the user experience.

  16. Usability and user driven innovation - unity or clash?

    DEFF Research Database (Denmark)

    Fronczek-Munter, Aneta

    2011-01-01

    influential publications within the academic fields of Facilities Management, Architecture and Engineering, Participatory Design and Software design. Outline: The paper will discuss different understandings of the concept ‗usability‘ and its relation to ‗user driven innovation‘, which depends on the academic...... identified additional key concepts to usability: Context, culture, situation and experience. Understanding those might be achieved by involving users. In this paper, usability of the built environment will be related to the idea of ‗user driven innovation‘ - participatory processes in which users...... are involved in design. The question in this paper is to what extent, and how users can be involved in design processes to create better and innovative buildings of enhanced usability....

  17. Towards engagement of digital Malaysian traditional games: Usability evaluation experience

    Science.gov (United States)

    Bakar, Nur Azzah Abu; ChePa, Noraziah

    2016-08-01

    Focusing on measuring the engagement towards digital Malaysian traditional games, this paper discusses engagement of digital traditional games from usability aspect. Three digital versions of Malaysian traditional games were evaluated. They are Dam Haji, Congkak and Gasing-X. Usability is one of the significant contributing factors towards engagement of digital games. Usability helps in verifying the requirements, successes and functionality of the games which are missing. The study adopted the heuristic instruments developed by Jakob Nielson in 1990 which consists of 17 heuristic component protocols based on interface design. Evaluation involved 50 respondents who are IT and domain experts. Result analysis is discussed and presented for each game. Results suggested features and aspects to be improved in the development of future digital Malaysian traditional games towards better engagement of the games.

  18. Dogmas in the assessment of usability evaluation methods

    DEFF Research Database (Denmark)

    Hornbæk, Kasper

    2010-01-01

    Usability evaluation methods (UEMs) are widely recognised as an essential part of systems development. Assessments of the performance of UEMs, however, have been criticised for low validity and limited reliability. The present study extends this critique by describing seven dogmas in recent work...... on UEMs. The dogmas include using inadequate procedures and measures for assessment, focusing on win-lose outcomes, holding simplistic models of how usability evaluators work, concentrating on evaluation rather than on design and working from the assumption that usability problems are real. We discuss...... research approaches that may help move beyond the dogmas. In particular, we emphasise detailed studies of evaluation processes, assessments of the impact of UEMs on design carried out in real-world systems development and analyses of how UEMs may be combined...

  19. Formation of the wide asynchronous binary asteroid population

    Energy Technology Data Exchange (ETDEWEB)

    Jacobson, Seth A. [Department of Astrophysical and Planetary Science, UCB 391, University of Colorado, Boulder, CO 80309 (United States); Scheeres, Daniel J.; McMahon, Jay [Department of Aerospace Engineering Sciences, UCB 429, University of Colorado, Boulder, CO 80309 (United States)

    2014-01-01

    We propose and analyze a new mechanism for the formation of the wide asynchronous binary population. These binary asteroids have wide semimajor axes relative to most near-Earth and main belt asteroid systems. Confirmed members have rapidly rotating primaries and satellites that are not tidally locked. Previously suggested formation mechanisms from impact ejecta, from planetary flybys, and directly from rotational fission events cannot satisfy all of the observations. The newly hypothesized mechanism works as follows: (1) these systems are formed from rotational fission, (2) their satellites are tidally locked, (3) their orbits are expanded by the binary Yarkovsky-O'Keefe-Radzievskii-Paddack (BYORP) effect, (4) their satellites desynchronize as a result of the adiabatic invariance between the libration of the secondary and the mutual orbit, and (5) the secondary avoids resynchronization because of the YORP effect. This seemingly complex chain of events is a natural pathway for binaries with satellites that have particular shapes, which define the BYORP effect torque that acts on the system. After detailing the theory, we analyze each of the wide asynchronous binary members and candidates to assess their most likely formation mechanism. Finally, we suggest possible future observations to check and constrain our hypothesis.

  20. Asynchronous Replica Exchange Software for Grid and Heterogeneous Computing

    Science.gov (United States)

    Gallicchio, Emilio; Xia, Junchao; Flynn, William F.; Zhang, Baofeng; Samlalsingh, Sade; Mentes, Ahmet; Levy, Ronald M.

    2015-01-01

    Parallel replica exchange sampling is an extended ensemble technique often used to accelerate the exploration of the conformational ensemble of atomistic molecular simulations of chemical systems. Inter-process communication and coordination requirements have historically discouraged the deployment of replica exchange on distributed and heterogeneous resources. Here we describe the architecture of a software (named ASyncRE) for performing asynchronous replica exchange molecular simulations on volunteered computing grids and heterogeneous high performance clusters. The asynchronous replica exchange algorithm on which the software is based avoids centralized synchronization steps and the need for direct communication between remote processes. It allows molecular dynamics threads to progress at different rates and enables parameter exchanges among arbitrary sets of replicas independently from other replicas. ASyncRE is written in Python following a modular design conducive to extensions to various replica exchange schemes and molecular dynamics engines. Applications of the software for the modeling of association equilibria of supramolecular and macromolecular complexes on BOINC campus computational grids and on the CPU/MIC heterogeneous hardware of the XSEDE Stampede supercomputer are illustrated. They show the ability of ASyncRE to utilize large grids of desktop computers running the Windows, MacOS, and/or Linux operating systems as well as collections of high performance heterogeneous hardware devices. PMID:27103749

  1. Asynchronous glaciation at Nanga Parbat, northwestern Himalaya Mountains, Pakistan

    Science.gov (United States)

    Phillips, William M.; Sloan, Valerie F.; Shroder, John F., Jr.; Sharma, Pankaj; Clarke, Michèle L.; Rendell, Helen M.

    2000-05-01

    We present a new glacial chronology demonstrating asynchroneity between advances of Himalayan glaciers and Northern Hemisphere ice-sheet volumes. Glaciers at Nanga Parbat expanded during the early to middle Holocene ca. 9.0 5.5 ka. No major advances at Nanga Parbat during the last global glacial stage of marine oxygen isotope stage 2 (MIS-2) between 24 and 11 ka were identified. Preliminary evidence also indicates advances between ca. 60 and 30 ka. These periods of high ice volume coincide with warm, wet regional climates dominated by a strong southwest Asian summer monsoon. The general lack of deposits dating from MIS-2 suggests that Nanga Parbat was too arid to support expanded ice during this period of low monsoon intensity. Advances during warm, wet periods are possible for the high-altitude summer accumulation glaciers typical of the Himalayas, and explain asynchronous behavior. However, the Holocene advances at Nanga Parbat appear to have been forced by an abrupt drop in temperature ca. 8.4 8.0 ka and an increase in winter precipitation ca. 7 5.5 ka. These results highlight the overall sensitivity of Himalayan glaciation to orbital forcing of monsoon intensity, and on millennial or shorter time scales, to changes in North Atlantic circulation.

  2. Asynchronous Code-Division Random Access Using Convex Optimization

    CERN Document Server

    Applebaum, Lorne; Duarte, Marco F; Calderbank, Robert

    2011-01-01

    Many applications in cellular systems and sensor networks involve a random subset of a large number of users asynchronously reporting activity to a base station. This paper examines the problem of multiuser detection (MUD) in random access channels for such applications. Traditional orthogonal signaling ignores the random nature of user activity in this problem and limits the total number of users to be on the order of the number of signal space dimensions. Contention-based schemes, on the other hand, suffer from delays caused by colliding transmissions and the hidden node problem. In contrast, this paper presents a novel asynchronous (non-orthogonal) code-division random access scheme along with a convex optimization-based MUD algorithm that overcomes the issues associated with orthogonal signaling and contention-based methods. Two key distinguishing features of the proposed algorithm are that it does not require knowledge of the delay or channel state information of every user and it has polynomial-time com...

  3. Asynchronous Task-Based Polar Decomposition on Manycore Architectures

    KAUST Repository

    Sukkari, Dalal

    2016-10-25

    This paper introduces the first asynchronous, task-based implementation of the polar decomposition on manycore architectures. Based on a new formulation of the iterative QR dynamically-weighted Halley algorithm (QDWH) for the calculation of the polar decomposition, the proposed implementation replaces the original and hostile LU factorization for the condition number estimator by the more adequate QR factorization to enable software portability across various architectures. Relying on fine-grained computations, the novel task-based implementation is also capable of taking advantage of the identity structure of the matrix involved during the QDWH iterations, which decreases the overall algorithmic complexity. Furthermore, the artifactual synchronization points have been severely weakened compared to previous implementations, unveiling look-ahead opportunities for better hardware occupancy. The overall QDWH-based polar decomposition can then be represented as a directed acyclic graph (DAG), where nodes represent computational tasks and edges define the inter-task data dependencies. The StarPU dynamic runtime system is employed to traverse the DAG, to track the various data dependencies and to asynchronously schedule the computational tasks on the underlying hardware resources, resulting in an out-of-order task scheduling. Benchmarking experiments show significant improvements against existing state-of-the-art high performance implementations (i.e., Intel MKL and Elemental) for the polar decomposition on latest shared-memory vendors\\' systems (i.e., Intel Haswell/Broadwell/Knights Landing, NVIDIA K80/P100 GPUs and IBM Power8), while maintaining high numerical accuracy.

  4. Asynchronously sampled blind source separation for coherent optical links

    Science.gov (United States)

    Detwiler, Thomas F.; Searcy, Steven M.; Stark, Andrew J.; Ralph, Stephen E.; Basch, Bert E.

    2011-01-01

    Polarization multiplexing is an integral technique for generating spectrally efficient 100 Gb/s and higher optical links. Post coherent detection DSP-based polarization demultiplexing of QPSK links is commonly performed after timing recovery. We propose and demonstrate a method of asynchronous blind source separation using the constant modulus algorithm (CMA) on the asynchronously sampled signal to initially separate energy from arbitrarily aligned polarization states. This method lends well to implementation as it allows for an open-loop sampling frequency for analog-to-digital conversion at less than twice the symbol rate. We show that the performance of subsequent receiver functions is enhanced by the initial pol demux operation. CMA singularity behavior is avoided through tap settling constraints. The method is applicable to QPSK transmissions and many other modulation formats as well, including general QAM signals, offset-QPSK, and CPM, or a combination thereof. We present the architecture and its performance under several different formats and link conditions. Comparisons of complexity and performance are drawn between the proposed architecture and conventional receivers.

  5. Continuous EEG signal analysis for asynchronous BCI application.

    Science.gov (United States)

    Hsu, Wei-Yen

    2011-08-01

    In this study, we propose a two-stage recognition system for continuous analysis of electroencephalogram (EEG) signals. An independent component analysis (ICA) and correlation coefficient are used to automatically eliminate the electrooculography (EOG) artifacts. Based on the continuous wavelet transform (CWT) and Student's two-sample t-statistics, active segment selection then detects the location of active segment in the time-frequency domain. Next, multiresolution fractal feature vectors (MFFVs) are extracted with the proposed modified fractal dimension from wavelet data. Finally, the support vector machine (SVM) is adopted for the robust classification of MFFVs. The EEG signals are continuously analyzed in 1-s segments, and every 0.5 second moves forward to simulate asynchronous BCI works in the two-stage recognition architecture. The segment is first recognized as lifted or not in the first stage, and then is classified as left or right finger lifting at stage two if the segment is recognized as lifting in the first stage. Several statistical analyses are used to evaluate the performance of the proposed system. The results indicate that it is a promising system in the applications of asynchronous BCI work.

  6. Asynchronous replica exchange software for grid and heterogeneous computing

    Science.gov (United States)

    Gallicchio, Emilio; Xia, Junchao; Flynn, William F.; Zhang, Baofeng; Samlalsingh, Sade; Mentes, Ahmet; Levy, Ronald M.

    2015-11-01

    Parallel replica exchange sampling is an extended ensemble technique often used to accelerate the exploration of the conformational ensemble of atomistic molecular simulations of chemical systems. Inter-process communication and coordination requirements have historically discouraged the deployment of replica exchange on distributed and heterogeneous resources. Here we describe the architecture of a software (named ASyncRE) for performing asynchronous replica exchange molecular simulations on volunteered computing grids and heterogeneous high performance clusters. The asynchronous replica exchange algorithm on which the software is based avoids centralized synchronization steps and the need for direct communication between remote processes. It allows molecular dynamics threads to progress at different rates and enables parameter exchanges among arbitrary sets of replicas independently from other replicas. ASyncRE is written in Python following a modular design conducive to extensions to various replica exchange schemes and molecular dynamics engines. Applications of the software for the modeling of association equilibria of supramolecular and macromolecular complexes on BOINC campus computational grids and on the CPU/MIC heterogeneous hardware of the XSEDE Stampede supercomputer are illustrated. They show the ability of ASyncRE to utilize large grids of desktop computers running the Windows, MacOS, and/or Linux operating systems as well as collections of high performance heterogeneous hardware devices.

  7. Spatiotemporal Features for Asynchronous Event-based Data

    Directory of Open Access Journals (Sweden)

    Xavier eLagorce

    2015-02-01

    Full Text Available Bio-inspired asynchronous event-based vision sensors are currently introducing a paradigm shift in visual information processing. These new sensors rely on a stimulus-driven principle of light acquisition similar to biological retinas. They are event-driven and fully asynchronous, thereby reducing redundancy and encoding exact times of input signal changes, leading to a very precise temporal resolution. Approaches for higher-level computer vision often rely on the realiable detection of features in visual frames, but similar definitions of features for the novel dynamic and event-based visual input representation of silicon retinas have so far been lacking. This article addresses the problem of learning and recognizing features for event-based vision sensors, which capture properties of truly spatiotemporal volumes of sparse visual event information. A novel computational architecture for learning and encoding spatiotemporal features is introduced based on a set of predictive recurrent reservoir networks, competing via winner-take-all selection. Features are learned in an unsupervised manner from real-world input recorded with event-based vision sensors. It is shown that the networks in the architecture learn distinct and task-specific dynamic visual features, and can predict their trajectories over time.

  8. A geometric approach for fault detection and isolation of stator short circuit failure in a single asynchronous machine

    KAUST Repository

    Khelouat, Samir

    2012-06-01

    This paper deals with the problem of detection and isolation of stator short-circuit failure in a single asynchronous machine using a geometric approach. After recalling the basis of the geometric approach for fault detection and isolation in nonlinear systems, we will study some structural properties which are fault detectability and isolation fault filter existence. We will then design filters for residual generation. We will consider two approaches: a two-filters structure and a single filter structure, both aiming at generating residuals which are sensitive to one fault and insensitive to the other faults. Some numerical tests will be presented to illustrate the efficiency of the method.

  9. Game usability in North American video game industry

    OpenAIRE

    Tapani, J. (Juho)

    2016-01-01

    Competition is so fierce in the video game industry that the companies need to find different angles to make their games stand out from the crowd. Game usability provides one such angle which can result in a better overall user experience. The goals of this research were to find out what usability methods are used in North American video game companies, how the companies define the term “game usability”, and are they utilizing heuristic evaluation. The data was gathered by collecting surv...

  10. Usability/Sentiment for the Enterprise and ENTERPRISE

    Science.gov (United States)

    Meza, David; Berndt, Sarah

    2014-01-01

    The purpose of the Sentiment of Search Study for NASA Johnson Space Center (JSC) is to gain insight into the intranet search environment. With an initial usability survey, the authors were able to determine a usability score based on the Systems Usability Scale (SUS). Created in 1986, the freely available, well cited, SUS is commonly used to determine user perceptions of a system (in this case the intranet search environment). As with any improvement initiative, one must first examine and document the current reality of the situation. In this scenario, a method was needed to determine the usability of a search interface in addition to the user's perception on how well the search system was providing results. The use of the SUS provided a mechanism to quickly ascertain information in both areas, by adding one additional open-ended question at the end. The first ten questions allowed us to examine the usability of the system, while the last questions informed us on how the users rated the performance of the search results. The final analysis provides us with a better understanding of the current situation and areas to focus on for improvement. The power of search applications to enhance knowledge transfer is indisputable. The performance impact for any user unable to find needed information undermines project lifecycle, resource and scheduling requirements. Ever-increasing complexity of content and the user interface make usability considerations for the intranet, especially for search, a necessity instead of a 'nice-to-have'. Despite these arguments, intranet usability is largely disregarded due to lack of attention beyond the functionality of the infrastructure (White, 2013). The data collected from users of the JSC search system revealed their overall sentiment by means of the widely-known System Usability Scale. Results of the scores suggest 75%, +/-0.04, of the population rank the search system below average. In terms of a grading scaled, this equated to D or

  11. A new asynchronous parallel algorithm for inferring large-scale gene regulatory networks.

    Directory of Open Access Journals (Sweden)

    Xiangyun Xiao

    Full Text Available The reconstruction of gene regulatory networks (GRNs from high-throughput experimental data has been considered one of the most important issues in systems biology research. With the development of high-throughput technology and the complexity of biological problems, we need to reconstruct GRNs that contain thousands of genes. However, when many existing algorithms are used to handle these large-scale problems, they will encounter two important issues: low accuracy and high computational cost. To overcome these difficulties, the main goal of this study is to design an effective parallel algorithm to infer large-scale GRNs based on high-performance parallel computing environments. In this study, we proposed a novel asynchronous parallel framework to improve the accuracy and lower the time complexity of large-scale GRN inference by combining splitting technology and ordinary differential equation (ODE-based optimization. The presented algorithm uses the sparsity and modularity of GRNs to split whole large-scale GRNs into many small-scale modular subnetworks. Through the ODE-based optimization of all subnetworks in parallel and their asynchronous communications, we can easily obtain the parameters of the whole network. To test the performance of the proposed approach, we used well-known benchmark datasets from Dialogue for Reverse Engineering Assessments and Methods challenge (DREAM, experimentally determined GRN of Escherichia coli and one published dataset that contains more than 10 thousand genes to compare the proposed approach with several popular algorithms on the same high-performance computing environments in terms of both accuracy and time complexity. The numerical results demonstrate that our parallel algorithm exhibits obvious superiority in inferring large-scale GRNs.

  12. Asynchronous API Pattern and its Application%异步接口模式及其应用

    Institute of Scientific and Technical Information of China (English)

    何华海; 丁柯

    2002-01-01

    In distributed systems,high efficiency can be achieved using asynchronous API between client and server.This paper provides an architectural pattern that implements asynchronous API generally. Asynchronous methods donot execute operations directly,however,they delegate the sending and receiving process to individual threads via aqueue ,the client deals with results by means of callback ,wait or check. Synchronous API is implemented on the baseof asynchronous API. Presently the asynchronous API pattern has been employed in the implementation of messagequeue middleware ISMQ.

  13. Usability Evaluation Methods for Gesture-Based Games: A Systematic Review

    Science.gov (United States)

    Simor, Fernando Winckler; Brum, Manoela Rogofski; Schmidt, Jaison Dairon Ebertz; De Marchi, Ana Carolina Bertoletti

    2016-01-01

    Background Gestural interaction systems are increasingly being used, mainly in games, expanding the idea of entertainment and providing experiences with the purpose of promoting better physical and/or mental health. Therefore, it is necessary to establish mechanisms for evaluating the usability of these interfaces, which make gestures the basis of interaction, to achieve a balance between functionality and ease of use. Objective This study aims to present the results of a systematic review focused on usability evaluation methods for gesture-based games, considering devices with motion-sensing capability. We considered the usability methods used, the common interface issues, and the strategies adopted to build good gesture-based games. Methods The research was centered on four electronic databases: IEEE, Association for Computing Machinery (ACM), Springer, and Science Direct from September 4 to 21, 2015. Within 1427 studies evaluated, 10 matched the eligibility criteria. As a requirement, we considered studies about gesture-based games, Kinect and/or Wii as devices, and the use of a usability method to evaluate the user interface. Results In the 10 studies found, there was no standardization in the methods because they considered diverse analysis variables. Heterogeneously, authors used different instruments to evaluate gesture-based interfaces and no default approach was proposed. Questionnaires were the most used instruments (70%, 7/10), followed by interviews (30%, 3/10), and observation and video recording (20%, 2/10). Moreover, 60% (6/10) of the studies used gesture-based serious games to evaluate the performance of elderly participants in rehabilitation tasks. This highlights the need for creating an evaluation protocol for older adults to provide a user-friendly interface according to the user’s age and limitations. Conclusions Through this study, we conclude this field is in need of a usability evaluation method for serious games, especially games for

  14. Usability in telemedicine systems—a literature survey

    NARCIS (Netherlands)

    Klaassen, B.; Beijnum, van B.J.F.; Hermens, H.J.

    2016-01-01

    Introduction: The rapid development of sensors and communication technologies enable the growth of new innovative services in healthcare, such as Telemedicine. An essential ingredient in the development of a telemedicine system and its final acceptance by end users are usability studies. The princip

  15. Usability of four commercially-oriented EEG systems

    Science.gov (United States)

    Hairston, W. David; Whitaker, Keith W.; Ries, Anthony J.; Vettel, Jean M.; Cortney Bradford, J.; Kerick, Scott E.; McDowell, Kaleb

    2014-08-01

    Electroencephalography (EEG) holds promise as a neuroimaging technology that can be used to understand how the human brain functions in real-world, operational settings while individuals move freely in perceptually-rich environments. In recent years, several EEG systems have been developed that aim to increase the usability of the neuroimaging technology in real-world settings. Here, the usability of three wireless EEG systems from different companies are compared to a conventional wired EEG system, BioSemi’s ActiveTwo, which serves as an established laboratory-grade ‘gold standard’ baseline. The wireless systems compared include Advanced Brain Monitoring’s B-Alert X10, Emotiv Systems’ EPOC and the 2009 version of QUASAR’s Dry Sensor Interface 10-20. The design of each wireless system is discussed in relation to its impact on the system’s usability as a potential real-world neuroimaging system. Evaluations are based on having participants complete a series of cognitive tasks while wearing each of the EEG acquisition systems. This report focuses on the system design, usability factors and participant comfort issues that arise during the experimental sessions. In particular, the EEG systems are assessed on five design elements: adaptability of the system for differing head sizes, subject comfort and preference, variance in scalp locations for the recording electrodes, stability of the electrical connection between the scalp and electrode, and timing integration between the EEG system, the stimulus presentation computer and other external events.

  16. Investigating the Usability of Classroom Management Strategies among Elementary Schoolteachers

    Science.gov (United States)

    Briesch, Amy M.; Briesch, Jacquelyn M.; Chafouleas, Sandra M.

    2015-01-01

    Although teachers are often asked to implement classroom interventions to address student behavior, little is known about their perceived usability of many evidence-based strategies. One thousand five elementary schoolteachers completed the Usage Rating Profile-Intervention-Revised (URP-IR) with regard to the use of one of five evidence-based…

  17. Usability of cerebrospinal fluid biomarkers in a tertiary memory clinic

    DEFF Research Database (Denmark)

    Brandt, C.; Bahl, J.C.; Heegaard, N.H.

    2008-01-01

    AIM: Assays for cerebrospinal fluid (CSF) levels of total tau, phospho-tau protein and beta-amyloid 1-42 have been available for some years. The aim of the study was to assess the usability of these biomarkers in a mixed population of tertiary dementia referral patients in a university-based memory...

  18. Measurement of the Clinical Usability of a Configurable EHR

    DEFF Research Database (Denmark)

    Møller-Jensen, John; Lund Pedersen, Ivan; Simonsen, Jesper

    2006-01-01

    The objective of the project was to measure the clinical usability of an EHR configured by use of participatory design with clinicians from a neurological stroke unit in order to get input to the County’s future strategy for incremental implementation of EHR. The content of the EHR was defined...

  19. Approaches for Evaluating the Usability of Assistive Technology Product Prototypes

    Science.gov (United States)

    Choi, Young Mi; Sprigle, Stephen H.

    2011-01-01

    User input is an important component to help guide designers in producing a more usable product. Evaluation of prototypes is one method of obtaining this input, but methods for evaluating assistive technology prototypes during design have not been adequately described or evaluated. This project aimed to compare different methods of evaluating…

  20. APPLICATION OF USABILITY CONCEPTS IN WINE MARKETING: A MULTIDISCIPLINARY REVIEW

    Directory of Open Access Journals (Sweden)

    Cătălina CHIVU-DRAGHIA

    2015-10-01

    Full Text Available Various studies have shown that the wine consumption decline in young generation could be influenced by the perception of wine as intimidating and difficult to understand, and by the lack of adaptability of the product’s communication strategy and packaging design to their lifestyle. Information available on the packaging is often complex and confusing for novice wine consumers and sometimes even irrelevant in regards to the intrinsic characteristics of the product. Furthermore, wine is seen by young adult consumers as old fashion, formal and mostly not associated with their relaxed attitude and “on the move” lifestyle. The objective of this paper is to analyse the usability key principles and heuristic and their applicability in wine marketing as a mean to improve the perception and increase understanding of wine for the young and/or novice consumers. The paper aims to review the existing knowledge and findings about the concept of usability (with special emphasis on Usability Engineering and Human Computer Interaction (HCI, in order to explore the aspects applicable in wine marketing. The usability concept proves useful in wine marketing to simplify the decision process, to make the meeting with the product less intimidating and more engaging, and to decrease the risk perception for the inexperienced wine consumers.