1994), an enormous proliferation of VOs has followed in theory and practice across academic disciplines and industries. Being “virtual” had almost become a fashion embraced by corporations and other businesses, groups of organizations engaged in cooperation/collaboration or trading, libraries, schools, government organizations, non-government organizations, churches, museums, and so on. The imp...

IceT is based on the premise that distributed computations involve resources, processes, data, and users, and that secure yet exible mechanisms for cooperation and communication between these entities is the key to metacomputing infrastructures. The IceT computing environment is a dynamically changing virtual machine which is constructed by assembling multiple hosts or by merging of, or recursi...

This paper presents a distributed virtual reality environment for children called EVE— Environnements Virtuels pour Enfants. The virtual environment architecture is reactive agents based. The FCM-like dynamic action planning mechanism assures agent’s adaptability to its environment changes. This virtual environment supports cooperation among members of a dispersed team engaged in a concurrent c...

In an emergency situation, receiving prompt and organized help from nearby people is of critical importance. The growing use of online social networks (OSNs) in emergency situations is a clear indication of the natural applicability of online social networking technologies to emergency responses. Despite this intense interest, a number of fundamental limitations still exist, such as lack of con...

—Diversity is an effective technique to enhance link quality and enable multiple users to pool their resources to form a virtual antenna array that obtains spatial diversity. In this paper, we propose a generalized Distributed Turbo Codes (DTC)-based coded cooperation protocol for two-hop relay networks with an arbitrary number of relays. This scheme aims at achieving improved diversity over t...

This paper presents an approach combining concepts of virtual storytelling with cooperative processes. We will describe why storytelling is relevant in cooperation support applications. We will outline how storytelling concepts provide a new quality for groupware applications. Different prototypes illustrate a combination of a groupware application with various storytelling components in a Thea...

In the present contribution the problem of signal interception in a virtual MIMO scenario is considered. A possible distributed signal interception algorithm which is able to detect and discriminate between two similar OFDM signals is analyzed. Distributed and stand-alone algorithms are compared through simulations in a multipath environment and the different levels of cooperation required amon...

A cooperation enterprises network is defined as a group of companies which interact among themselves to exchange competences, therefore, a series of necessities from companies, which would be important in a manufacturing company, and also be in the cooperation network. Through organizational modeling, the manager has a greater view and quicker understanding of the company, which allows the inte...

Cooperative diversity is a promising solution for diversity gain, multiplexing gain and energy saving. This technique involves multiple users sharing resources in order to build a virtual antenna array in a distributed manner. In this paper, we propose multi-user cooperation strategy that allows multiple users to transmit their data simultaneously in decode-and-forward relaying systems. We cons...