2,072 research outputs found
Semantic multimedia remote display for mobile thin clients
Current remote display technologies for mobile thin clients convert practically all types of graphical content into sequences of images rendered by the client. Consequently, important information concerning the content semantics is lost. The present paper goes beyond this bottleneck by developing a semantic multimedia remote display. The principle consists of representing the graphical content as a real-time interactive multimedia scene graph. The underlying architecture features novel components for scene-graph creation and management, as well as for user interactivity handling. The experimental setup considers the Linux X windows system and BiFS/LASeR multimedia scene technologies on the server and client sides, respectively. The implemented solution was benchmarked against currently deployed solutions (VNC and Microsoft-RDP), by considering text editing and WWW browsing applications. The quantitative assessments demonstrate: (1) visual quality expressed by seven objective metrics, e.g., PSNR values between 30 and 42 dB or SSIM values larger than 0.9999; (2) downlink bandwidth gain factors ranging from 2 to 60; (3) real-time user event management expressed by network round-trip time reduction by factors of 4-6 and by uplink bandwidth gain factors from 3 to 10; (4) feasible CPU activity, larger than in the RDP case but reduced by a factor of 1.5 with respect to the VNC-HEXTILE
Combining relevance information in a synchronous collaborative information retrieval environment
Traditionally information retrieval (IR) research has focussed on a single user interaction modality, where a user searches to satisfy an information need. Recent
advances in both web technologies, such as the sociable web of Web 2.0, and computer hardware, such as tabletop interface devices, have enabled multiple users to collaborate on many computer-related tasks. Due to these advances there is an increasing need to support
two or more users searching together at the same time, in order to satisfy a shared information need, which we refer to as Synchronous Collaborative Information Retrieval.
Synchronous Collaborative Information Retrieval (SCIR) represents a significant paradigmatic shift from traditional IR systems. In order to support an effective SCIR search, new techniques are required to coordinate users' activities. In this chapter we explore the effectiveness of a sharing of knowledge policy on a collaborating group. Sharing of knowledge refers to the process of passing relevance information across users,
if one user finds items of relevance to the search task then the group should benefit in the form of improved ranked lists returned to each searcher.
In order to evaluate the proposed techniques we simulate two users searching together through an incremental feedback system. The simulation assumes that users decide on an initial query with which to begin the collaborative search and proceed through the search by providing relevance judgments to the system and receiving a new ranked list. In order to populate these simulations we extract data from the interaction logs of various
experimental IR systems from previous Text REtrieval Conference (TREC) workshops
Recommended from our members
Reducing Client-Server Communication for Efficient Real-Time Web Applications: The Use of Adaptive Polling as A Case Study for Multi-User Web Applications
A key challenge of current multi-user web applications is to provide users with interesting events and information in real-time. This research reviews the most common real-time web techniques to identify drawbacks while exploring solutions to improve simplicity, efficiency, and compatibility within a client-server environment. Two solutions are proposed for enhancing the efficiency of real-time web techniques by reducing client-server communication. First, a model of browser monitoring control observes the browser activity and decides if to postpone client-server communication in the case of inactive tabs. This model was implemented and tested with results demonstrating that a significant number of client-server connections can be avoided in the browser background. These results suggest the solution can be optimised for any real-time technique as it benefits from being a developer side technique that works consistently on all browsers. Second, âAdaptive Pollingâ is a pull-based real-time web technique to overcome bandwidth issues of the reverse AJAX method of âPollingâ by controlling the frequency of requesting updates from the server based on the last server response. This approach is implemented and tested with results showing how a significant number of redundant connections can be avoided while the server does not return updates. This solution is a good alternative to other real-time web techniques as it features low latency, the simplicity of implementation, and compatibility with all browsers and servers
Diverse Contributions to Implicit Human-Computer Interaction
Cuando las personas interactĂșan con los ordenadores, hay mucha
informaciĂłn que no se proporciona a propĂłsito. Mediante el estudio de estas
interacciones implĂcitas es posible entender quĂ© caracterĂsticas de la interfaz
de usuario son beneficiosas (o no), derivando asĂ en implicaciones para el
diseño de futuros sistemas interactivos.
La principal ventaja de aprovechar datos implĂcitos del usuario en
aplicaciones informĂĄticas es que cualquier interacciĂłn con el sistema puede
contribuir a mejorar su utilidad. AdemĂĄs, dichos datos eliminan el coste de
tener que interrumpir al usuario para que envĂe informaciĂłn explĂcitamente
sobre un tema que en principio no tiene por qué guardar relación con la
intenciĂłn de utilizar el sistema. Por el contrario, en ocasiones las
interacciones implĂcitas no proporcionan datos claros y concretos. Por ello,
hay que prestar especial atenciĂłn a la manera de gestionar esta fuente de
informaciĂłn.
El propĂłsito de esta investigaciĂłn es doble: 1) aplicar una nueva visiĂłn tanto
al diseño como al desarrollo de aplicaciones que puedan reaccionar
consecuentemente a las interacciones implĂcitas del usuario, y 2)
proporcionar una serie de metodologĂas para la evaluaciĂłn de dichos
sistemas interactivos. Cinco escenarios sirven para ilustrar la viabilidad y la
adecuaciĂłn del marco de trabajo de la tesis. Resultados empĂricos con
usuarios reales demuestran que aprovechar la interacciĂłn implĂcita es un
medio tanto adecuado como conveniente para mejorar de mĂșltiples maneras
los sistemas interactivos.Leiva Torres, LA. (2012). Diverse Contributions to Implicit Human-Computer Interaction [Tesis doctoral no publicada]. Universitat PolitĂšcnica de ValĂšncia. https://doi.org/10.4995/Thesis/10251/17803Palanci
Collaborative video searching on a tabletop
Almost all system and application design for multimedia systems is based around a single user working in isolation to perform some task yet much of the work for which we use computers to help us, is based on working collaboratively with colleagues. Groupware systems do support user collaboration but typically this is supported through software and users still physically work independently. Tabletop systems, such as the DiamondTouch from MERL, are interface devices which support direct user collaboration on a tabletop. When a tabletop is used as the interface for a multimedia system, such as a video search system, then this kind of direct collaboration raises many questions for system design. In this paper we present a tabletop system for supporting a pair of users in a video search task and we evaluate the system not only in terms of search performance but also in terms of userâuser interaction and how different user personalities within each pair of searchers impacts search performance and user interaction. Incorporating the user into the system evaluation as we have done here reveals several interesting results and has important ramifications for the design of a multimedia search system
Adaptive hypertext and hypermedia : workshop : proceedings, 3rd, Sonthofen, Germany, July 14, 2001 and Aarhus, Denmark, August 15, 2001
This paper presents two empirical usability studies based on techniques from Human-Computer Interaction (HeI) and software engineering, which were used to elicit requirements for the design of a hypertext generation system. Here we will discuss the findings of these studies, which were used to motivate the choice of adaptivity techniques. The results showed dependencies between different ways to adapt the explanation content and the document length and formatting. Therefore, the system's architecture had to be modified to cope with this requirement. In addition, the system had to be made adaptable, in addition to being adaptive, in order to satisfy the elicited users' preferences
- âŠ