The Experts below are selected from a list of 225 Experts worldwide ranked by ideXlab platform

Anju Saha - One of the best experts on this subject based on the ideXlab platform.

  • Qualitative usability feature selection with ranking: a novel approach for ranking the identified usability problematic attributes for academic websites using data-mining techniques
    Human-centric Computing and Information Sciences, 2017
    Co-Authors: Kalpna Sagar, Anju Saha
    Abstract:

    Objective The aim of this study is to identify common usability problematic patterns that belong to top-50 academic websites as a whole and then ranking of these identified usability problems is also provided. Methods In this study, a novel approach is proposed that is based upon the integration of conventional usability testing and heuristic evaluation with data-mining knowledge discovery process. An experiment is conducted to evaluate ISO 9241-151 guidelines under 16-different categories by hundred participants who are frequent users of academic websites. After evaluation, the qualitative usability data is collected and different data-mining techniques i.e. association rule and decision tree are applied to recognize fully functional and problematic usability attributes. Identified problematic attributes represent common usability problems patterns related to academic websites from the qualitative viewpoint only. This study further prioritizes these problematic attributes by using the ranking algorithm that represents the order in which usability issues must be resolved. Results In this study, 16-different categories are considered for usability evaluation of academic websites. The results show that no issues are identified in two-categories i.e. {Headings_Titles_Labels and The Home_Page}. In Scrolling and Paging category, Horizontal Scrolling is identified as a major issue whereas, in Internationalization category, the users do not identify supported languages on most of the academic websites. Users do not find websites to be highly secured under Security category. Our findings investigate that most of the issues are found in Search and Social Media categories. Furthermore, users easily locate 50.53% guidelines on websites as fully functional whereas, 49.46% of characteristics are considered as problematic usability features that are not functional on the academic website as a whole. Conclusions Identification of common usability problems at an early stage can lower substantially the development efforts in cost and time. Software developers can restrain from these potential usability problems during the development of novel systems under the same context. Providing appropriate solutions for these problems can become valuable in software development. The proposed approach concludes that conventional usability evaluation methods can go beyond just than testing of systems. The study is a milestone towards identification and prioritizing problematic usability features for academic websites and helps in providing the wholistic approach of usability problematic patterns for web-domain.

  • Qualitative usability feature selection with ranking: a novel approach for ranking the identified usability problematic attributes for academic websites using data-mining techniques
    Human-centric Computing and Information Sciences, 2017
    Co-Authors: Kalpna Sagar, Anju Saha
    Abstract:

    The aim of this study is to identify common usability problematic patterns that belong to top-50 academic websites as a whole and then ranking of these identified usability problems is also provided. In this study, a novel approach is proposed that is based upon the integration of conventional usability testing and heuristic evaluation with data-mining knowledge discovery process. An experiment is conducted to evaluate ISO 9241-151 guidelines under 16-different categories by hundred participants who are frequent users of academic websites. After evaluation, the qualitative usability data is collected and different data-mining techniques i.e. association rule and decision tree are applied to recognize fully functional and problematic usability attributes. Identified problematic attributes represent common usability problems patterns related to academic websites from the qualitative viewpoint only. This study further prioritizes these problematic attributes by using the ranking algorithm that represents the order in which usability issues must be resolved. In this study, 16-different categories are considered for usability evaluation of academic websites. The results show that no issues are identified in two-categories i.e. {Headings_Titles_Labels and The Home_Page}. In Scrolling and Paging category, Horizontal Scrolling is identified as a major issue whereas, in Internationalization category, the users do not identify supported languages on most of the academic websites. Users do not find websites to be highly secured under Security category. Our findings investigate that most of the issues are found in Search and Social Media categories. Furthermore, users easily locate 50.53% guidelines on websites as fully functional whereas, 49.46% of characteristics are considered as problematic usability features that are not functional on the academic website as a whole. Identification of common usability problems at an early stage can lower substantially the development efforts in cost and time. Software developers can restrain from these potential usability problems during the development of novel systems under the same context. Providing appropriate solutions for these problems can become valuable in software development. The proposed approach concludes that conventional usability evaluation methods can go beyond just than testing of systems. The study is a milestone towards identification and prioritizing problematic usability features for academic websites and helps in providing the wholistic approach of usability problematic patterns for web-domain.

Kalpna Sagar - One of the best experts on this subject based on the ideXlab platform.

  • Qualitative usability feature selection with ranking: a novel approach for ranking the identified usability problematic attributes for academic websites using data-mining techniques
    Human-centric Computing and Information Sciences, 2017
    Co-Authors: Kalpna Sagar, Anju Saha
    Abstract:

    Objective The aim of this study is to identify common usability problematic patterns that belong to top-50 academic websites as a whole and then ranking of these identified usability problems is also provided. Methods In this study, a novel approach is proposed that is based upon the integration of conventional usability testing and heuristic evaluation with data-mining knowledge discovery process. An experiment is conducted to evaluate ISO 9241-151 guidelines under 16-different categories by hundred participants who are frequent users of academic websites. After evaluation, the qualitative usability data is collected and different data-mining techniques i.e. association rule and decision tree are applied to recognize fully functional and problematic usability attributes. Identified problematic attributes represent common usability problems patterns related to academic websites from the qualitative viewpoint only. This study further prioritizes these problematic attributes by using the ranking algorithm that represents the order in which usability issues must be resolved. Results In this study, 16-different categories are considered for usability evaluation of academic websites. The results show that no issues are identified in two-categories i.e. {Headings_Titles_Labels and The Home_Page}. In Scrolling and Paging category, Horizontal Scrolling is identified as a major issue whereas, in Internationalization category, the users do not identify supported languages on most of the academic websites. Users do not find websites to be highly secured under Security category. Our findings investigate that most of the issues are found in Search and Social Media categories. Furthermore, users easily locate 50.53% guidelines on websites as fully functional whereas, 49.46% of characteristics are considered as problematic usability features that are not functional on the academic website as a whole. Conclusions Identification of common usability problems at an early stage can lower substantially the development efforts in cost and time. Software developers can restrain from these potential usability problems during the development of novel systems under the same context. Providing appropriate solutions for these problems can become valuable in software development. The proposed approach concludes that conventional usability evaluation methods can go beyond just than testing of systems. The study is a milestone towards identification and prioritizing problematic usability features for academic websites and helps in providing the wholistic approach of usability problematic patterns for web-domain.

  • Qualitative usability feature selection with ranking: a novel approach for ranking the identified usability problematic attributes for academic websites using data-mining techniques
    Human-centric Computing and Information Sciences, 2017
    Co-Authors: Kalpna Sagar, Anju Saha
    Abstract:

    The aim of this study is to identify common usability problematic patterns that belong to top-50 academic websites as a whole and then ranking of these identified usability problems is also provided. In this study, a novel approach is proposed that is based upon the integration of conventional usability testing and heuristic evaluation with data-mining knowledge discovery process. An experiment is conducted to evaluate ISO 9241-151 guidelines under 16-different categories by hundred participants who are frequent users of academic websites. After evaluation, the qualitative usability data is collected and different data-mining techniques i.e. association rule and decision tree are applied to recognize fully functional and problematic usability attributes. Identified problematic attributes represent common usability problems patterns related to academic websites from the qualitative viewpoint only. This study further prioritizes these problematic attributes by using the ranking algorithm that represents the order in which usability issues must be resolved. In this study, 16-different categories are considered for usability evaluation of academic websites. The results show that no issues are identified in two-categories i.e. {Headings_Titles_Labels and The Home_Page}. In Scrolling and Paging category, Horizontal Scrolling is identified as a major issue whereas, in Internationalization category, the users do not identify supported languages on most of the academic websites. Users do not find websites to be highly secured under Security category. Our findings investigate that most of the issues are found in Search and Social Media categories. Furthermore, users easily locate 50.53% guidelines on websites as fully functional whereas, 49.46% of characteristics are considered as problematic usability features that are not functional on the academic website as a whole. Identification of common usability problems at an early stage can lower substantially the development efforts in cost and time. Software developers can restrain from these potential usability problems during the development of novel systems under the same context. Providing appropriate solutions for these problems can become valuable in software development. The proposed approach concludes that conventional usability evaluation methods can go beyond just than testing of systems. The study is a milestone towards identification and prioritizing problematic usability features for academic websites and helps in providing the wholistic approach of usability problematic patterns for web-domain.

Christmann Olivier - One of the best experts on this subject based on the ideXlab platform.

  • Navigation in large unstructured collections of visual data
    2008
    Co-Authors: Christmann Olivier
    Abstract:

    Le but de cette thèse est de proposer et d’évaluer une représentation 3D de collections non structurées de documents visuels. L'objectif est d’accroître le confort visuel, de réduire le temps de recherche et de favoriser la mémorisation des positions des documents, par rapport aux logiciels actuels de gestion de collections d'images. Avec une représentation sous forme d'un cylindre vertical, nous avons conçu 2 visualisations : les photographies sont plaquées sur la face interne ou externe du cylindre, pour implémenter 2 métaphores courantes d’interaction, respectivement locomotion et manipulation. 3 études expérimentales ont été réalisées, avec la même méthodologie : la réalisation par les participants de 2 tâches courantes de recherche visuelle. La première étude est exploratoire, la seconde compare les 2 vues 3D plus finement et la dernière compare les vues 3D à une vue 2D classique. Dans cette dernière étude, l’usage d’un oculomètre permet de comprendre les relations entre les caractéristiques géométriques des vues et les stratégies visuelles des participants. Les participants préfèrent majoritairement les vues 3D. Les performances n'influent pas sur les préférences ; les caractéristiques géométriques statiques ont principalement été mentionnées pour justifier les préférences. Les stratégies de parcours visuel sont davantage influencées par la caractéristique dynamique des vues (i.e., défilement Horizontal), ce qui avantage la vue interne. Enfin, les vues 3D garantissent un meilleur confort visuel, en offrant un meilleur guidage du regard (principalement la vue interne) et en minimisant les saccades désordonnées observées dans la vue 2D.The goal of this thesis is to propose and to assess a 3D representation of large unstructured collections of images. The purpose is to improve comfort of visual search, to reduce search times and to better support memorization of documents’ locations, compared with standard photo browsers. With a representation as a vertical cylinder, we designed two visualizations: photos are plastered on the inner or the outer side of the cylinder, to implement 2 common interaction metaphors, respectively locomotion and manipulation. 3 experimental studies were performed, with the same methodology: subjects performed 2 common types of visual search tasks. The first study is exploratory, the second one compares both 3D views in-depth and the last one compares 3D views with a standard 2D view. In this study, an eye-tracker helps us to understand relations between geometrical features and visual exploration strategies. 3D views are preferred by a majority of participants. Preferences are not influenced by performances; static visual features were mainly used to justified preferences. Visual exploration strategies are mainly influenced by the common dynamic visual feature (i.e., Horizontal Scrolling), which is an advantage for the inner view. At last, 3D views ensure a better comfort of visual search, with a better gaze guidance (especially the inner view) and by minimizing uncoordinated saccades which were observed in the 2D view

  • Navigation dans de grands ensembles non structurés de documents visuels
    HAL CCSD, 2008
    Co-Authors: Christmann Olivier
    Abstract:

    The goal of this thesis is to propose and to assess a 3D representation of large unstructured collections of images. The purpose is to improve comfort of visual search, to reduce search times and to better support memorization of documents'locations, compared with standard photo browsers. With a representation as a vertical cylinder, we designed two visualizations: photos are plastered on the inner or the outer side of the cylinder, to implement 2 common interaction metaphors, respectively locomotion and manipulation. 3 experimental studies were performed, with the same methodology: subjects performed 2 common types of visual search tasks. The first study is exploratory, the second one compares both 3D views in-depth and the last one compares 3D views with a standard 2D view. In this study, an eye-tracker helps us to understand relations between geometrical features and visual exploration strategies. 3D views are preferred by a majority of participants. Preferences are not influenced by performances; static visual features were mainly used to justified preferences. Visual exploration strategies are mainly influenced by the common dynamic visual feature (i.e., Horizontal Scrolling), which is an advantage for the inner view. At last, 3D views ensure a better comfort of visual search, with a better gaze guidance (especially the inner view) and by minimizing uncoordinated saccades which were observed in the 2D view.Le but de cette thèse est de proposer et d'évaluer une représentation 3D de collections non structurées de documents visuels. L'objectif est d'accroître le confort visuel, de réduire le temps de recherche et de favoriser la mémorisation des positions des documents, par rapport aux logiciels actuels de gestion de collections d'images. Avec une représentation sous forme d'un cylindre vertical, nous avons conçu 2 visualisations : les photographies sont plaquées sur la face interne ou externe du cylindre, pour implémenter 2 métaphores courantes d'interaction, respectivement locomotion et manipulation. 3 études expérimentales ont été réalisées, avec la même méthodologie : la réalisation par les participants de 2 tâches courantes de recherche visuelle. La première étude est exploratoire, la seconde compare les 2 vues 3D plus finement et la dernière compare les vues 3D à une vue 2D classique. Dans cette dernière étude, l'usage d'un oculomètre permet de comprendre les relations entre les caractéristiques géométriques des vues et les stratégies visuelles des participants. Les participants préfèrent majoritairement les vues 3D. Les performances n'influent pas sur les préférences ; les caractéristiques géométriques statiques ont principalement été mentionnées pour justifier les préférences. Les stratégies de parcours visuel sont davantage influencées par la caractéristique dynamique des vues (i.e., défilement Horizontal), ce qui avantage la vue interne. Enfin, les vues 3D garantissent un meilleur confort visuel, en offrant un meilleur guidage du regard (principalement la vue interne) et en minimisant les saccades désordonnées observées dans la vue 2D

  • Navigation dans de grands ensembles non structurés de documents visuels
    2008
    Co-Authors: Christmann Olivier, Carbonell Noëlle
    Abstract:

    Le but de cette thèse est de proposer et d évaluer une représentation 3D de collections non structurées de documents visuels. L'objectif est d accroître le confort visuel, de réduire le temps de recherche et de favoriser la mémorisation des positions des documents, par rapport aux logiciels actuels de gestion de collections d'images. Avec une représentation sous forme d'un cylindre vertical, nous avons conçu 2 visualisations : les photographies sont plaquées sur la face interne ou externe du cylindre, pour implémenter 2 métaphores courantes d interaction, respectivement locomotion et manipulation. 3 études expérimentales ont été réalisées, avec la même méthodologie : la réalisation par les participants de 2 tâches courantes de recherche visuelle. La première étude est exploratoire, la seconde compare les 2 vues 3D plus finement et la dernière compare les vues 3D à une vue 2D classique. Dans cette dernière étude, l usage d un oculomètre permet de comprendre les relations entre les caractéristiques géométriques des vues et les stratégies visuelles des participants. Les participants préfèrent majoritairement les vues 3D. Les performances n'influent pas sur les préférences ; les caractéristiques géométriques statiques ont principalement été mentionnées pour justifier les préférences. Les stratégies de parcours visuel sont davantage influencées par la caractéristique dynamique des vues (i.e., défilement Horizontal), ce qui avantage la vue interne. Enfin, les vues 3D garantissent un meilleur confort visuel, en offrant un meilleur guidage du regard (principalement la vue interne) et en minimisant les saccades désordonnées observées dans la vue 2D.The goal of this thesis is to propose and to assess a 3D representation of large unstructured collections of images. The purpose is to improve comfort of visual search, to reduce search times and to better support memorization of documents locations, compared with standard photo browsers. With a representation as a vertical cylinder, we designed two visualizations: photos are plastered on the inner or the outer side of the cylinder, to implement 2 common interaction metaphors, respectively locomotion and manipulation. 3 experimental studies were performed, with the same methodology: subjects performed 2 common types of visual search tasks. The first study is exploratory, the second one compares both 3D views in-depth and the last one compares 3D views with a standard 2D view. In this study, an eye-tracker helps us to understand relations between geometrical features and visual exploration strategies. 3D views are preferred by a majority of participants. Preferences are not influenced by performances; static visual features were mainly used to justified preferences. Visual exploration strategies are mainly influenced by the common dynamic visual feature (i.e., Horizontal Scrolling), which is an advantage for the inner view. At last, 3D views ensure a better comfort of visual search, with a better gaze guidance (especially the inner view) and by minimizing uncoordinated saccades which were observed in the 2D view.NANCY1-Bib. numérique (543959902) / SudocSudocFranceF

Tom Jewett - One of the best experts on this subject based on the ideXlab platform.

  • How Screen Magnification with and Without Word-Wrapping Affects the User Experience of Adults with Low Vision
    Advances in Intelligent Systems and Computing, 2017
    Co-Authors: Elyse C. Hallett, Wayne Dick, Tom Jewett
    Abstract:

    Most users with low vision benefit from enlarged content in documents. One method for enlarging web content is using screen magnification software (SMS). This typically requires Horizontal Scrolling. Another enlargement method uses web browser zoom controls. If the author uses a coding technique like responsive web design (RWD), browser zoom enables automatic word wrapping and no Horizontal Scrolling. The purpose of the present study was to compare how these two different magnification methods affect reading comprehension and visual fatigue of people with low vision when reading on a computer screen. Participants read passages and answered comprehension questions on a computer. Each participant used either SMS or RWD to enlarge content. Performance (accuracy to reading comprehension questions and time-on-task) and measures of user experience (ratings of usability, visual fatigue, and nausea) were obtained. Although no differences in reading comprehension were obtained, participants reported higher levels of usability and lower levels of nausea when reading with RWD for about an hour as compared to when reading with SMS. Based on post-study interviews with participants, the nausea was likely due to the need to scroll Horizontally for extended periods of time. Thus, use of SMS without a means to eliminate or reduce Horizontal Scrolling for the user can lead to reading discomfort and lower user experiences for adults with low vision.

  • HCI (4) - The Usability of Magnification Methods: A Comparative Study Between Screen Magnifiers and Responsive Web Design
    Human Interface and the Management of Information. Information and Knowledge Design, 2015
    Co-Authors: Elyse C. Hallett, Wayne E. Dick, Blake Arnsdorff, John Sweet, Zach Roberts, Tom Jewett
    Abstract:

    Screen magnifiers, which often result in the need for Horizontal Scrolling, and enlarging content through the browser itself are two magnification methods used by computer-users with low vision. With responsive web design (RWD), the later can be done with word wrapping, thus eliminating the need to Horizontally scroll. The present study compared the effectiveness of the two methods when participants performed two types of Web-based tasks: reading comprehension and data input. Results showed that when using RWD, participants completed the reading comprehension tasks more quickly and accurately compared to when using screen magnifiers. Participants were also able to complete data input more quickly with RWD than with the screen magnifier. Finally, participants rated RWD to be more usable than screen magnifiers. The results of this study have implications for further developments of web accessibility guidelines.

Ralph Sommerer - One of the best experts on this subject based on the ideXlab platform.

  • SmartView: Enhanced Document Viewer for Mobile Devices
    2002
    Co-Authors: Natasa Milic-frayling, Ralph Sommerer
    Abstract:

    Web pages with complex layout do not display well on small screens. They are difficult to read on mobile devices such as PDAs or Web enabled phones because they require extensive Horizontal Scrolling. SmartView is a browser feature that performs partitioning of an HTML document content into logical sections. Individual sections can be selected by the user for viewing independently from the rest of the document. The selected portion of the document is presented in a detailed view with modified layout for optimal reading or meeting other user’s or device requirements. The SmartView interface enforces the concept of a document by allowing the user to view both the document overview (e.g., a zoomed-out version of the document, a document thumbnail, etc.), indicating the logical decomposition of the document, and a detailed view of the selected section of the document. SmartView further enhances the user’s browsing experience by providing additional information on the document content. This information annotates logical sections and is derived from the document itself or supplied by external services. For example, SmartView assists the user in searching and browsing by providing feedback on the relevance of the page and its constituent parts with respect to a previously issued query to a search engine. The feedback is provided in two forms: as indicators of the number of hits on the overview presentation of the page and as term highlights within detailed view of a selected portion of the page. SmartView can be implemented on the device as an integral feature of the browser or as a (local or remote) service that provides the decomposition of a page and query processing on the client’s behalf.

  • Microsoft Corporation
    2002
    Co-Authors: Natasa Milic-frayling, Ralph Sommerer
    Abstract:

    Web pages with complex layout do not display well on small screens. They are difficult to read on mobile devices such as PDAs or Web enabled phones because they require extensive Horizontal Scrolling. SmartView is a browser feature that performs partitioning of an HTML document content into logical sections. Individual sections can be selected by the user for viewing independently from the rest of the document. The selected portion of the document is presented in a detailed view with modified layout for optimal reading or meeting other user’s or device requirements. The SmartView interface enforces the concept of a document by allowing the user to view both the document overview (e.g., a zoomed-out version of the document, a document thumbnail, etc.), indicating the logical decomposition of the document, and a detailed view of the selected section of the document. SmartView further enhances the user’s browsing experience by providing additional information on the document content. This information annotates logical sections and is derived from the document itself or supplied by external services. For example, SmartView assists the user in searching and browsing by providing feedback on the relevance of the page and its constituent parts with respect to a previously issued query to a search engine. The feedback is provided in two forms: as indicators of the number of hits on the overview presentation of the page and as term highlights within detailed view of a selected portion of the page. SmartView can be implemented on the device as an integral feature of the browser or as a (local or remote) service that provides the decomposition of a page and query processing on the client’s behalf. 1