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Exploring heterogeneous datasets from different searcher perspectives

Exploring heterogeneous datasets from different searcher per...

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6th International Workshop on Semantic Web User interaction: Sharing Ideas for Complex Problems in User interaction, SWUI 2009 - Collocated with the 8th International Semantic Web Conference, ISWC 2009

作者： Wilson, Max L. Schraefel, M.C. Future Interaction Technologies Lab. Department of Computer Science Swansea University United Kingdom Intelligence Agents and Multimedia Research Group School of Electronics and Computer Science Southampton University United Kingdom

This paper demonstrates how a recently developed analytical usability evaluation method, the Sii framework, can by used to inspect semantic search interfaces for how they support people working with the large heterogeneous datasets afforded by Linked Data. To enrich the discussion, an analysis of the Tabulator browser for Linked Data is presented and discussed in terms of the workshop's case study surrounding archivists. The analysis shows that while the Tabulator provides some strong support for sense-making, it would struggle to support such archivists in first defining their needs. In analyzing the Tabulator from the perspectives of the archivists, this paper demonstrates how the new Sii method can provide rigor and reason to the assessment of future design decisions made for Semantic Web user interactions.

关键词： Linked data

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Generating high-coverage semantic orientation lexicons from overtly marked words and a thesaurus

Generating high-coverage semantic orientation lexicons from ...

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2009 Conference on Empirical Methods in Natural Language Processing, EMNLP 2009, Held in Conjunction with ACL-IJCNLP 2009

作者： Mohammad, Saif Dunne, Cody Dorr, Bonnie Laboratory for Computational Linguistics and Information Processing University of Maryland United States Human-Computer Interaction Lab. University of Maryland United States Institute for Advanced Computer Studies University of Maryland United States Department of Computer Science University of Maryland United States Human Language Technology Center of Excellence United States

Sentiment analysis often relies on a semantic orientation lexicon of positive and negative words. A number of approaches have been proposed for creating such lexicons, but they tend to be computationally expensive, and usually rely on significant manual annotation and large corpora. Most of these methods use WordNet. In contrast, we propose a simple approach to generate a high-coverage semantic orientation lexicon, which includes both individual words and multi-word expressions, using only a Roget-like thesaurus and a handful of affixes. Further, the lexicon has properties that support the Polyanna Hypothesis. Using the General Inquirer as gold standard, we show that our lexicon has 14 percentage points more correct entries than the leading WordNet-based high-coverage lexicon (SentiWordNet). In an extrinsic evaluation, we obtain significantly higher performance in determining phrase polarity using our thesaurus-based lexicon than with any other. Additionally, we explore the use of visualization techniques to gain insight into the our algorithm beyond the evaluations mentioned above. © 2009 ACL and AFNLP.

关键词： Thesauri

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Strong mobile device protection from loss and capture 09

Strong mobile device protection from loss and capture

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2nd International Conference on PErvasive Technologies Related to Assistive Environments, PETRA 2009

作者： Le, Zhengyi Bishop, Matt Makedon, Fillia Heracleia Human-Centered Computing Lab Department of Computer Science and Engineering University of Texas Arlington United States Department of Computer Science University of California Davis United States

ISBN: (纸本)9781605584096

Assistive environments employ multiple types of devices to monitor human actions and identify critical events for phys- ical safety. Some of the devices must be wireless in order to be nonintrusive. This introduces the problem of authenticat- ing these devices and building secure communication chan- nels among them. The traditional way is to assign a private key to a device for digital identification. In this paper, we present an approach to protect the private key by introduc- ing a third party and bilaterally and proactively generating a random number to refresh key shares based on Bellare and Miner's forward secure signature scheme. This improves the resilient mediated RSA solution because the entire private key is also updated periodically. In this way, if an attacker steals one key share, he only can use it for a limited period of time because it will be obsolete immediately after the next refresh operation. Even if he compromises both key shares simultaneously, the digital signatures generated by previous private keys are still secure. Our scheme is proven to be intrusion resilient based on the CDH assumption in the ran- dom oracle model. The construction is also quite efficient. Copyright 2009 ACM.

关键词： Authentication

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Replica placement algorithm for highly available peer-to-peer storage systems

Replica placement algorithm for highly available peer-to-pee...

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1st International Conference on Advances in P2P Systems, AP2PS 2009

作者： Song, Gyuwon Kim, Suhyun Seo, Daeil Human Computer Interaction and Robotics Department University of Science and Technology Seoul Korea Republic of Imaging Media Research Center Korea Institute of Science and Technology Seoul Korea Republic of

ISBN: (纸本)9780769538310

Peer-to-peer (P2P) technology is an emerging approach to overcoming the limitations of the traditional client server architecture. However, building a highly available P2P system is quite challenging, in particular a P2P storage system. The reason is due to the fundamental nature of P2P systems: peers can join and leave at any time without any notice. Replication is one of the strategies in overcoming the unpredictable behavior of peers. A good replication algorithm should use the minimum number of replicas to provide the desired availability of data. The popular approach in the previous studies is a random placement of replicas, but it ignores the wide difference in the availability of each peer. In this paper, we develop a replica placement algorithm which exploits the availability pattern of each individual peer. By comparing our algorithm with a random placement scheme, we show that our algorithm dramatically improves the data availability with moderate overhead in terms of memory consumption and processing time in both ideal and practical conditions. © 2009 IEEE.

关键词： Availability

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Sweep-shake: Finding digital resources in physical environments 09

Sweep-shake: Finding digital resources in physical environme...

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Living in a world as colorful as you - 11th International Conference on human-computer interaction with Mobile Devices and Services, MobileHCI 2009

作者： Robinson, Simon Eslambolchilar, Parisa Jones, Matt Future Interaction Technology Lab Computer Science Department Swansea University Swansea SA2 8PP United Kingdom

ISBN: (纸本)9781605582818

in this article we describe the Sweep-Shake system, a novel, low interaction cost approach to supporting the spontaneous discovery of geo-located information. By sweeping a mobile device around their environment, users browse for interesting information related to points of interest. We built a mobile haptic prototype which encourages the user to explore their surroundings to search for location information, helping them discover this by providing directional vibrotactile feedback. Once potential targets are selected, the interaction is extended to offer an hierarchy of information levels with a simple method for filtering and selecting desired types of data for each geo-tagged location. We describe and motivate our approach and present a short field trial to situate our design in a real environment, followed by a more detailed user study that compares it against an equivalent visual-based system.

关键词： Location

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Evaluating haptics for information discovery while walking

Evaluating haptics for information discovery while walking

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23rd Annual Conference on human computer interaction, HCI 2009

作者： Robinson, Simon Eslambolchilar, Parisa Jones, Matt Future Interaction Technology Lab. Computer Science Department Swansea University Swansea SA2 8PP United Kingdom

ISBN: (纸本)9781906124878

In this article we describe and evaluate a novel, low interaction cost approach to supporting the spontaneous discovery of geo-tagged information while on the move. Our mobile haptic prototype helps users to explore their environment by providing directional vibrotactile feedback based on the presence of location data. We conducted a study to investigate whether users can find these targets while walking, comparing their performance when using only haptic feedback to that when using an equivalent visual system. The results are encouraging, and here we present our findings, discussing their significance and issues relevant to the design of future systems that combine haptics with location awareness. © 2009 The Author.

关键词： Location

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Poster: A hybrid direct visual editing method for architectural massing study in virtual environments

Poster: A hybrid direct visual editing method for architectu...

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IEEE Symposium on 3D User Interfaces (3DUI)

作者： Jian Chen Doug A. Bowman David H. Laidlaw Department of Computer Science Brown University USA Department of Computer Science Center of Human-Computer Interaction Virginia Technology USA

We present a hybrid user interface and gesture-based direct visual editing techniques for quick and rough object creation and manipulation in three-dimensional (3D) virtual environments (VEs). The user interface includes a novel table-prop to resemble an architect's physical workbench. A tracked pinch glove and a stylus pen provide both rough and fingertip level precise spatial input. For quick placement, objects do not float in space, but instead obey a set of constrained physics laws. Experimental results indicate our design is effective for architectural massing study. Our work contributes to the hardware system design and novel gesture-based interaction techniques, which have the potential to bring VEs into practical use in architecture.

关键词： Virtual environment User interfaces Shape computer science Large screen displays Costs Hardware computer architecture Physics computing computer graphics

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human pose estimation from monocular image captures

Human pose estimation from monocular image captures

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2009 IEEE International Conference on Multimedia and Expo, ICME 2009

作者： Lin, Huei-Yung Chen, Ting-Wen Chen, Chih-Chang Hsieh, Chia-Hao Lie, Wen-Nung Department of Electrical Engineering National Chung Cheng University Chiayi 621 Taiwan Human Computer Interaction Lab. Industrial Technology Research Institute Tainan 734 Taiwan

ISBN: (纸本)9781424442911

A human pose estimation method from monocular image captures is presented. The objective is to develop a human-computer interface (HCI) for virtual sport activities. In the proposed technique, a graphical 3D human model is first constructed. Its projection on a virtual image plane is then used to match the silhouettes obtained from the image sequence. By iteratively adjusting the 3D pose of the graphical 3D model with the physical and anatomic constraints of human motion, the human pose and the associate 3D motion parameters can be uniquely identified. Experimental results are presented with the real scene images. ©2009 IEEE.

关键词： Iterative methods

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Product-based learning in software engineering education

Product-based learning in software engineering education

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Frontiers in Education (FIE) Conference

作者： Eric D. Ragan Stephen Frezza Jeremy Cannell Center for Human-Computer Interaction and Department of Computer Science Virginia Technology USA Computer and Information Science Department Gannon University USA Computer and Information Science Department USA

Problem-based learning is a pedagogy that employs open-ended problems as a means of increasing student motivation and interaction in addition to achieving the intended educational goals. We present product-based learning as an extension of collaborative problem-based learning by focusing on the design and development of a product as a solution to a proposed problem. In this approach, the instructor becomes an active member of the project team, working with the students to achieve the product vision. Through this method, students take control of their own learning while working together towards group success. Such a course design allows students to become active learners in achieving learning objectives, while at the same time providing project management and team-working experience. We explain the concept of product-based learning and demonstrate the process through the design and development of an educational software application. This project shows that the product-based method can promote positive attitudes, social interaction, and intentional learning in students while motivating them to achieve the intended learning objectives.

关键词： Software engineering Educational products Collaborative work Collaboration Project management Process design Application software Engineering education Programming Materials science and technology

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Understanding social computing participation with visual exploration tools

Understanding social computing participation with visual exp...

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International Symposium on Collaborative Technologies and Systems

作者： Ben Shneiderman Department of Computer Science & Human-Computer Interaction Laboratory University of Maryland College Park MD USA

The rapid growth of socio-technical systems, social media and social networking websites has raised the importance of understanding the determinants of their success. The pressure to understand success is increased by the shift from playful discretionary applications to mission critical applications in government, business, and civic settings. These include homeland defense, energy sustainability, environmental conservation, disaster response, and community safety. Information visualization tools and statistical methods can both be helpful, but their utility grows when they are well-integrated. This talk will demonstrate novel tools for network evolution and offer a framework for thinking about motivating technology-mediated social participation.

关键词： Social network services computer science Educational institutions Data visualization History Books Collaborative tools International collaboration Sociotechnical systems Application software

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