Catálogo de publicaciones - libros

Many researches on context aware computing are carried out around the world. Among them, Context-Toolkit and Semantic Space provide separation of concerns between sensor and application. They make application developing easier. However, they have one problem that is lacking of simplicity in communication, compatibility and flexibility in building systems. To solve it, we propose one delivery and storage structure using standardized simple network management protocol which is useful to deliver, store and manage sensed information. We also verify that this architecture is efficient in wireless sensor network to deliver and store environmental information through an implementation of a SNMP agent. We confirm that this architecture with simplicity, compatibility and flexibility gives the efficiency to developing systems.

This paper shows that geographic information system can successfully solve TSP (travelling salesman problem). It has been done using a module of the designed and implemented by authors GISness system. Three algorithms for solving TSP are available, including the proposed by authors an hybrid algorithm called 2optGAM. The results of research show that the algorithm is very promising.

In this paper, we propose a new route optimization scheme (EDNS-MIPv6) for MIPv6 using the enhanced Domain Name System (DNS) together with local mobility management scheme to reduce the signaling delay. EDNS-MIPv6 alleviates the triangle routing problem and reduces both the signaling delay to the home network, and the home agent’s processing load.

Simulcast Technique can be used to diminish handoff rate and share resources among multiple relays in MMR system. Using dynamic grouping, simulcast technique can also rearrange traffic load. In this paper, we analyze group handoff generated by dynamic grouping in MMR system. Performance is evaluated in view of blocking and handoff call dropping probability.

In this paper, we realize a DiffServ-based Multicast Router (DSMRouter) to provide the QoS adjustment for multicasting video transmission in the DiffServ network. To reach the QoS goals, the proportional fairness scheduling strategy is proposed for layered media flows, including I-frame, P-frame and B-frame flows, to determine the approximate reserved bandwidth. Additionally, the DSMRouter system dynamically changes the sending rates of various service queues to ensure that layered media packets with higher priority are always sent before those with lower priority. The results reveal that DSMRouter dynamically modify layered media’s sending rates among different service classes according to the network situation. The experimental results of the DSMRouter system on DiffServ networks also reveal that layered media with higher priority have less packet loss.