Tomochika Ozaki

Bandwidth-efficient multicast routing protocol for ad-hoc networks

In this paper, we propose and investigate a bandwidth-efficient multicast routing protocol for ad-hoc networks. The proposed protocol achieves low communication overhead, namely, it requires a small number of control packet transmissions for route setup and maintenance. The proposed protocol also achieves high multicast efficiency, namely, it can deliver multicast packets to receivers with a small number of multicast transmissions. To achieve high multicast efficiency with low communication overhead, the proposed protocol employs the following mechanisms: (1) on-demand invocation of the route setup and route maintenance process to avoid periodical control packet transmissions, (2) a new route setup mechanism that allows a newly joining node to find the nearest forwarding node, in order to minimize the number of added forwarding nodes, and (3) a route optimization mechanism that can detect and delete unnecessary forwarding nodes. Our simulation results show that the proposed protocol achieves high multicast efficiency with low communication overhead compared with other multicast routing protocols.

Bandwidth-efficient multicast routing for multihop, ad-hoc wireless networks

In this paper, we propose and investigate a bandwidth-efficient multicast routing protocol for ad-hoc networks. The proposed protocol achieves low communication overhead, namely, it requires a small number of control packet transmissions for route setup and maintenance. The proposed protocol also achieves high multicast efficiency, namely, it delivers multicast packets to receivers with a small number of transmissions. In order to achieve low communication overhead and high multicast efficiency, the proposed protocol employs the following mechanisms: (1) on-demand invocation of the route setup and route recovery processes to avoid periodic transmissions of control packets, (2) a new route setup process that allows a newly joining node to find the nearest forwarding node to minimize the number of forwarding nodes, and (3) a route optimization process that detects and removes unnecessary forwarding nodes to eliminate redundant and inefficient routes. Our simulation results show that the proposed protocol achieves high multicast efficiency with low communication overhead compared with other existing multicast routing protocols, especially in the ease where the number of receivers in a multicast group is large.

Development of electric power disaggregation system for chain stores

The number of small stores, such as convenience stores, is increasing, and their electric power consumption is also increasing. Disaggregation technology, which identifies the statuses of devices by measuring one current at the circuit breaker board, is a preferred solution to save energy. In this research, we propose an EMS with the disaggregation technology that can estimate electric power consumption. We have tested it at a convenience store. The result shows that the system estimated the electric power consumption to be less than 15% of the MAPE for most appliances.

Introduction to special sessions and the SS chairs/co-chairs

IEEE GCCE welcomes Special Session proposals which are related to up-to-date and cross-field topics. As the results of reviews, GCCE 2013 decided the following eight sessions to be held in the final program. We are glad to introduce the SS chairs who propose the interesting hot topics and their session abstracts.