Three dimensional visualization of the World Wide Web

Although large-scale public hypermedia structures such as the World Wide Web are popularly referred to as "cyberspace", the extent to which they constitute a space in the everyday sense of the word is questionable. This paper reviews recent work in the area of three dimensional (3D) visualization of the Web that has attempted to depict it in the form of a recognizable space; in other words, as a navigable landscape that may be visibly populated by its users. Our review begins by introducing a range of visualizations that address different aspects of using the Web. These include visualizations of Web structure, especially of links, that act as 3D maps; browsing history; searches; evolution of the Web; and the presence and activities of multiple users. We then summarize the different techniques that are employed by these visualizations. We conclude with a discussion of key challenges for the future

DIVE on the internet

This dissertation reports research and development of a platform for Collaborative Virtual Environments (CVEs). It has particularly focused on two major challenges: supporting the rapid development of scalable applications and easing their deployment on the Internet. This work employs a research method based on prototyping and refinement and promotes the use of this method for application development. A number of the solutions herein are in line with other CVE systems. One of the strengths of this work consists in a global approach to the issues raised by CVEs and the recognition that such complex problems are best tackled using a multi-disciplinary approach that understands both user and system requirements. CVE application deployment is aided by an overlay network that is able to complement any IP multicast infrastructure in place. Apart from complementing a weakly deployed worldwide multicast, this infrastructure provides for a certain degree of introspection, remote controlling and visualisation. As such, it forms an important aid in assessing the scalability of running applications. This scalability is further facilitated by specialised object distribution algorithms and an open framework for the implementation of novel partitioning techniques. CVE application development is eased by a scripting language, which enables rapid development and favours experimentation. This scripting language interfaces many aspects of the system and enables the prototyping of distribution-related components as well as user interfaces. It is the key construct of a distributed environment to which components, written in different languages, connect and onto which they operate in a network abstracted manner. The solutions proposed are exemplified and strengthened by three collaborative applications. The Dive room system is a virtual environment modelled after the room metaphor and supporting asynchronous and synchronous cooperative work. WebPath is a companion application to a Web browser that seeks to make the current history of page visits more visible and usable. Finally, the London travel demonstrator supports travellers by providing an environment where they can explore the city, utilise group collaboration facilities, rehearse particular journeys and access tourist information data

Three dimensional visualization of the World Wide Web

Although large-scale public hypermedia structures such as the World Wide Web are popularly referred to as "cyberspace", the extent to which they constitute a space in the everyday sense of the word is questionable. This paper reviews recent work in the area of three dimensional (3D) visualization of the Web that has attempted to depict it in the form of a recognizable space; in other words, as a navigable landscape that may be visibly populated by its users. Our review begins by introducing a range of visualizations that address different aspects of using the Web. These include visualizations of Web structure, especially of links, that act as 3D maps; browsing history; searches; evolution of the Web; and the presence and activities of multiple users. We then summarize the different techniques that are employed by these visualizations. We conclude with a discussion of key challenges for the future

An interactive environment for generating sequential information

We propose an interactive environment in which we can generate sequential information. Sequential information is a sequence of movements which makes changes of situations. The system allows a user to construct an environment for generating sequential information. We provide interactions and visualization for sequential information generation based on theoretical grounds.</p

An integrated visual framework for the human-Web interface

© 2002 IEEE. The design of Web sites has been largely ad hoc, with little concern about the effectiveness of navigation and maintenance. This paper presents a general framework with a human-Web interface that supports Web design through visual programming and reverse Web engineering through visualization. The paper describes the framework in the context of a Web tool, known as HWIT which has been developed for a pilot study

VAS (Visual Analysis System): An information visualization engine to interpret World Wide Web structure

People increasingly encounter problems of interpreting and filtering mass quantities of information. The enormous growth of information systems on the World Wide Web has demonstrated that we need systems to filter, interpret, organize and present information in ways that allow users to use these large quantities of information. People need to be able to extract knowledge from this sometimes meaningful but sometimes useless mass of data in order to make informed decisions. Web users need to have some kind of information about the sort of page they might visit, such as, is it a rarely referenced or often-referenced page? This master\u27s thesis presents a method to address these problems using data mining and information visualization techniques

Visualization of personal history for video navigation

Figure 1. Our prototype history-based interface called the Video History System (VHS) aids navigation through the management of a user’s personal viewing history. Playback of video is controlled with familiar tools such as play/pause, seek and filmstrip (left)- the VHS records each part of the video viewed by the user. The history is then visualized in one of two ways: as Video Tiles (centre) or as a Video Timeline (right).1 We present an investigation of two different visualizations of video history: Video Timeline and Video Tiles. Video Timeline extends the commonly employed list-based visualization for navigation history by applying size to indicate heuristics and occupying the full screen with a two-sided timeline. Video Tiles visualizes history items in a grid-based layout by follow-ing pre-defined templates based on items ’ heuristics and or-dering, utilizing screen space more effectively at the expense of a clearer temporal location. The visualizations are com-pared against the state-of-the-art method (a filmstrip-based visualization), with ten participants tasked with sharing their previously-seen affective intervals. Our study shows that our visualizations are perceived as intuitive and both outperform and are strongly preferred to the current method. Based on these results, Video Timeline and Video Tiles provide an ef-fective addition to video viewers to help manage the growing quantity of video. They provide users with insight into their navigation patterns, allowing them to quickly find previously-seen intervals, leading to efficient clip sharing, simpler au-thoring and video summarization

Browsing Icons: A Task-Based Approach for a Visual Web History

We have implemented a task and session based visual web history tool called Browsing Icons that dynamically draws animated graphs of the user's paths through the web. Using a proxy, it can be attached to any common web browser. Every web session builds an individual Browsing Graph with a characteristic shape. The graphs are organized in a hierarchy of user-defined tasks. Users can interrupt tasks and continue later using the graphs that provide access to all the web pages they have visited so far. The graphs can be reused for similar or recurrent tasks. By clustering the history hierarchically according to tasks, we try to cope with scale and to provide a powerful concept for easy revisitation. The visualizations have been implemented using the Jazz framework for zoomable user interfaces (ZUIs) in Java. A usability study showed that users like the system very much and appreciate its support of revisiting web pages. Ten users revisited web pages after a few minutes and other web pages after one to six days using both Netscape with Browsing Icons and Netscape alone. With the tool they completed the short-term revisits in 84% of the time required when using Netscape alone. The revisits after one to six days users could accomplish in 57.8% of the time they needed when using Netscape, thereby visiting only 53.8% as many pages. Users were significantly more satisfied with Browsing Icons than with pure Netscape. KEYWORDS: Web History Visualization, Task Based Information Organization, Information Visualization, Web Browser Usability, Jazz. UMIACS-TR-2001-85 HCIL-TR-2001-1

Evaluación de la enfermedad aterosclerótica celíaco-mesentérica en pacientes diabéticos con técnicas de imagen no invasivas

Tesis (Doctor)--Universidad Nacional de Córdoba. Facultad de Ciencias Médicas, 2006La circulación esplácnica es un lecho vascular con dos principales fuentes de flujo arterial, el Tronco Celíaco y la Arteria Mesentérica Superior. Existen múltiples comunicaciones entre ambas y con la Arteria Mesentérica Inferior. Debido a que existe este rico aporte arterial, la estenosis y aún la oclusión de alguno de estos tres vasos puede ocurrir sin síntomas abdominales isquémicos manifestos. La principal causa de estenosis es de origen arterioesclerótico y ocurre con mayor frecuencia en el origen de estos vasos, siendo responsable de más de 95 por ciento de los casos de isquemia mesentérica. En pacientes con sospecha de enfermedad vascular arteriosclerótica el método de imagen históricamente utilizado fue la arteriografía, que implica exposición a radiaciones ionizante y medios de contraste iodados nefrotóxicos. El objetivo de este trabajo fue demostrar que se pueden utilizar, en un grupo de pacientes vulnerables como los diabéticos, técnicas de imagen no invasivas como el Ultrasonido Doppler y la Angiografía por Resonancia Magnética en la detección de estenosis en el Tronco Celíaco y Arteria Mesentérica Superior, y establecer la relación de sexo, edad, factores de riesgo y enfermedad vascular concomitante con la enfermedad aterosclerótica y de los vaos esplácnicos (AU)María Elena Castrillón