In this paper, we explore the technologies behind the security models applied to distributed data access in a Grid environment. Our goal is to study a security model allowing data integrity, confidentiality, authentication and authorization for VO users. We split the process for data access in three levels: Grid authentication, Grid authorization, local enforcement. For each level, we introduce...

The exponential growth of intense research and development in various fields (particularly computer vision) has resulted in rapid technological advancements in the field of medicine. Many recent advances in image analysis([1-7]) supervised learning techniques([3],[4]) and free availability of algorithms and programs in the world wide web encourages and makes it even more desirable to develop an...

OBJECTIVE We examined the effects of several display characteristics of head-mounted displays (HMDs) on simulator sickness (SS). BACKGROUND Technological limitations, such as display delay and reduced field of view (FOV), affect perception when using an HMD and are often thought to be related to SS. Few studies have examined the relationship between FOV and geometric FOV (image scale factor) ...

This article offers a brief overview of the state-of-the-art ODR domain by presenting the contributions to the field made by the participants in this volume. It also examines some of the challenges that ODR face at present with regard to interoperability and the new evolutions of the Web 2.0. Finally, it also considers the need for a new vision of ODR that, while keeping pace with the technolog...

Image storage and retrieval are currently the focus of much research, yet an understanding of such basic issues as thh relationships between text and image, the effects of human processing of images, and the impact that these could have on systems design remains hazy. Many of those concerned with image processing and recognition rely on technological advances in such areas as machine vision to ...

This article offers a brief overview of the state-of-the-art ODR domain by presenting the contributions to the field made by the participants in this volume. It also examines some of the challenges that ODR face at present with regard to interoperability and the new evolutions of the Web 2.0. Finally, it also considers the need for a new vision of ODR that, while keeping pace with the technolog...

From a technological perspective, biometric gait recognition can be categorized into three approaches: Machine Vision based, Floor Sensor based and Wearable Sensor based. This survey covers historical development and current state of the art in accelerometer-based gait analysis, a sub-category of wearable sensor based gait recognition. It gives an all-around literature study describing the majo...

In 1988, Mark Weiser, a chief technologist at Xerox's Palo Alto Research Center, introduced the term ubiquitous computing, and heralded "the age of calm technology, when technology recedes into the background of our lives." This vision is now fast becoming a reality. Computing will soon be embedded everywhere in the fabric of our lives: in our bodies, phones, homes, and the environments in whic...

This article offers a brief overview of the state-of-the-art ODR domain by presenting the contributions to the field made by the participants in this volume. It also examines some of the challenges that ODR face at present with regard to interoperability and the new evolutions of the Web 2.0. Finally, it also considers the need for a new vision of ODR that, while keeping pace with the technolog...

discussion on matters arising from encountered problems while designing and introducing e-health systems is presented in this paper. In particular, some difficulties in the adaption of ICT to e-health systems have been emphasised. Additionally, the future vision of healthcare evolution by means of information technology is analysed. Questions which arose as to the main challenges for healthcare...