Catálogo de publicaciones - libros

This paper focuses on finding the suitable mapping between the input action with the portable information terminal (PIT) in the real world and the operation in the 3D information space. From the experiments, following suitable mappings are found. They are changing the PIT position for changing the view position, changing the PIT orientation for changing the view orientation, and picking or grasping the object and moving or rotating hand for selecting the object and moving or rotating it.

A mobile ad-hoc network [1] is a set of mobile nodes acting as routers in infrastructureless networking situations. In ad-hoc environments, to extend the lifetime of wireless mobile hosts, energy-efficient ad-hoc routing protocols must be designed. However, in conventional reactive ad-hoc routing, the route discovery operation is triggered whenever a source node has packets to send to a certain destination, but has no route information for the destination. Intermediate nodes, then, repeatedly broadcast the message until it is received by all nodes. This route discovery process could result in excessive drain of limited battery power and increase collisions in wireless transmission. In this paper, we propose an energy efficient route discovery scheme using the K-hop Pre Route Request (PRREQ) message which is only flooded within K hops from the source node. This reduces the number of nodes that participate in the route discovery process. Our empirical performance evaluation, which compares our proposed scheme to the conventional reactive adhoc routing schemes, demonstrates that proposed enhancement reduces energy consumed in the route discovery procedure by about 27% when each node initiates a new route at a rate of 0.05/sec.

Multimodal mobile interfaces to the Semantic Web offer access to complex knowledge and information structures. In SmartWeb we try to build multimodal interfaces to answer very specific closed and open domain questions by natural language dialogue and multimedia presentations. Advanced user interactions such as pointing gestures are also supported. We present the interaction design and its implementation for Semantic Web related knowledge structures, i.e., ontology instances and relations, and follow the principle of no presentation without representation for information content, its presentation, and interaction possibilities. In particular, we address the challenge to display interactive text and image results obtained from multiple homogeneous and heterogeneous information sources.

Society of Mobile Interactions was established in April 2006. Short history to establishment and topics of interests are introduced. Mobile interactions suggest interactions among people instead of mobile technology. First the influences of mobile mail to life and communication of young and elderly. Some aspects to be studied are discussed. Some trials to adapt people to mobile interactions are explained. Hito navi (handheld navigation) and Kid’s K-tie are discussed as the recent applications.

In this paper we propose an optimal information architecture model for mobile multimedia devices. In our study we first reviewed the information architecture models of four currently popular mobile multimedia devices, Apple iPod Video, Nokia N80, Sony Ericsson W800i and Sony PlayStation Portable (PSP). Then we used Open card sorting method to find out what kind of mental models does people have for optimal information architecture model. Finally we compared these two study results together and created a design proposal.

For adaptive content generation, it means that the application can recognize a user’s preference and consequently retrieve and present the appropriate media objects stored in the databases. That is, the application presents only the media objects with the conditions evaluated to be true according to the user’s demand or preference. The feature of adapting presentation contents can significantly improve browsing results through providing materials that are more suitable for each individual user. In the mobile environment, some more changing factors can affect a user’s access to the contents generated by the presentation engine. These factors include location, available bandwidth, past visits, the currently closest media source, etc. In this paper, we propose an adaptive content generating engine called Mach for mobility-aware multimedia applications. Mach’s goal is that a single content description file can be applied to compose various multimedia presentations. By following the statements of the description file and the user’s preference, Mach can dynamically generate adaptive contents for each class of users. In this way, the content designer does not need to compose several description files for each class of users. Mach is based on the XML (eXtensible Markup Language) standard and thus its platform independence makes our work well-suited to the mobile environment.

In this paper we highlight the need for privacy of user data used in digital identity management systems. We investigate the issues from the individual, business, and government perspectives. We provide surveys related to the growing problem of and the concerns of individuals with respect to the privacy of their identity data. We show the privacy concerns, especially with respect to and data, where the loss of privacy of that data may have serious consequences. Moreover, we also discuss how privacy concerns change according to the individual’s disposition to provide the data. Voluntary disclosure of personal information is more acceptable to users than if information disclosure is involuntary, like in the case of surveillance. Finally, we highlight the shortcomings of current identity management systems with respect to the current privacy needs and motivate the need of hardened importance of privacy enabling functionalities in such systems.

At the present Net Work Period of the IT history deep changes are taken place in collaboration between people and human communication, its structure, quantity, and quality. A dominating steering factor for the design and structure of work life as well as private life is the convergence of three technologies, computer technology, tele technology and media technology (ICT). Telecommunication technology has come to play a more a more dominant role in this convergence, especially internet and web technology. Embedded (ubiquitous) computer technology is making the process invisible, and media technology converges within itself (multimedia or cross media). Well functioning organizational are an important prerequisite for successful industrial and social change in the ICT society. Managing and working in an organization organized as a network, involves communication between people, groups, units, other organisations, and various combinations of these entities. ICT applications together with deep knowledge and insights in organisational design and management (ODAM) are the keys to social change. The author describes her convergence theory on ICT and Psychosocial Life Environment with special emphasis on psychosocial communication and sustainability in the Net Era of the ICT society.

This paper is a response to the lack of knowledge regarding actual online purchase behavior, and introduces behavior analysis as an alternative framework in studying consumers’ purchase behavior. Motivation to confirm an order online can from the concept of motivating operation (MO) be analyzed as those antecedents in the environmental setting (included verbal stimuli) that; (1) have an effect on the consequences of responding, and (2) influence the responses (including purchase) related to those consequences. Using the functional analytic framework from behavior analysis, MO is identified as a likely predictor of consumer tendency to confirm their online orders.

An increasing, degree of rich and dynamic content and abundant links are making Web pages visually cluttered. This paper presents a numerical tool to evaluate the screen complexity of a Web page using four critical measurements: size complexity, local density, grouping, and alignment. In the empirical study, we first translate the real screens from four first pages on Ebay auction web sites to serve as model screens that contain the structure of complexity without content. We subsequently compare the complexity values calculated from the model screens with the viewers’ judgment from the real screens. The resemblance between the results indicates that the tool is useful.