Peer-to-peer mobile video on-demand (P2MV0D) in the paper by Sato et al. (2006) showed one idea for the decentralized multimedia data distribution on the mobile environment. It allows a moving client to receive streaming data on demand from not only server but other moving clients in a peer-to-peer (P2P) manner, where video contents are divided into the same sized segment and aggregately sent and shared with as many receiving clients as possible. In this paper we discuss deploying P2MV0D under more real mobile environment, which has several delivery domains that have different amount of requests and several types of users that receive a video stream with different bandwidth. We employ the layered video cording and transmission schemes (Deering, 1993; McCanne et al., 1996; Li et al., 1998; Cheung and Zakhor, 1995) for P2MV0D to efficiently provide its service under such environment. The segment is further divided into smaller sized unit referred to as 'slice' and slicing and segmentation are carried out across the layered video streams. Mathematical analysis reveals this strategy reduces the traffic much better than simple use of P2MVOD

This paper presents a new form of video on-demand called 'fragmented patching', which enables clients to move around freely even while receiving video. Patching techniques, which greatly reduce the required network bandwidth through multicasting, have potential for on-demand video distribution. However, patch-flow techniques based on unicast data are unsuitable for providing services to mobile clients because of the intricate process required for relatively short unicast flows to individually follow a moving client. In fragmented patching, however, patch flows are sent via broadcasting. In addition, to avoid increasing traffic due to broadcasting, the patch flows are broken down into segments, each of which is aggregated to be shared with as many multiple clients as possible. We compared the two techniques by using mathematical models, which present the average usage of link bandwidth with the traffic intensity (Erlang), and numerical analysis revealed the aggregation effect by segmenting patch flows countervails the increase in traffic caused by broadcasting patch flows.

In this paper, we propose an innovative information delivery service on intelligent transport systems (ITS), which enables users to see their future vision delivered from users at further points along the route. This service requires special multicast and mobile routing schemes. We have developed a source mobility support multicast (SMM) technique that guarantees consecutive communication in high-speed mobile environments and minimizes the overhead in reconstructing multicast trees, which is caused by a source movement. SMM is based on a new concept where multicast tree is constructed over cellular IP network according to A. G. Valko (1999), in which a source point tree and a rendezvous point tree are combined into one multicast tree. SMM provides wide operability by partitioning the network and confining protocol uniqueness and topological constraints within the local access networks. This paper shows our design of SMM architecture and its detail protocols.

This paper describes a new network scheme that minimizes the consumption of network resources for on-demand streaming-video distribution through multicasting. In general, on-demand video distribution has been realized through unicasting. Asynchronous multicast techniques that reduce the load on the on-demand video server have been studied, but there has been little consideration of ways to reduce the network load. We have developed a statistical traffic-control theory based on asynchronous multicasting that can be used to adjust traffic on the trunk and branch links along the distribution tree to meet the network bandwidth design requirements to ensure QOS. In addition, we propose a dynamic bandwidth-allocation and traffic-adaptation algorithm that allows finite resources to be shared among different video deliveries by assigning the available bandwidth for each according to request rates. To show the implementability of these ideas, we consider their operation with protocols that autonomously construct a multicast tree and guarantee the QOS. We also discuss the effects of using this scheme based on a numerical analysis and simulation results regarding real traffic traces and the service-blocking rate.

The integrity in components of an operating nuclear power plant (NPP) is usually monitored on a daily basis by operator patrols. Currently, there is a pressing need to replace such human patrol activities by systems of automated monitoring in order to reduce radiation exposure and the workload imposed on operators. From this perspective, and under the sponsorship of the Ministry of International Trade and Industry (MITI), we embarked upon a R&D project in 1991 with the objective of developing TOSHIBA Remote Inspection System (TOSRIS) for NPPs. We built a prototype system and examined it in a mockup of a typical NPP environments. This project was completed in 1996. This paper describes the concept of TOSRIS, how the inspection position is calculated, how plans are passed using a 3D-CAD database, and mockup tests.

The integrity of components of an operating nuclear power plant (NPP) is usually monitored on a daily basis by operator patrols. Currently, there is a great need to replace such human patrol activities by systems of automated remote monitoring in order to reduce radiation exposure and the severe workload imposed on operators. From this perspective, and under the sponsorship of Ministry of International Trade and Industry (MITI), the authors embarked upon a R&D project in 1991 with the objective of developing an autonomous mobile patrol system for NPPs. The project is scheduled to be completed in 1996. This paper describes the concept of the autonomous mobile robot system, which comprises a hierarchical autonomous mobile control system, a localization system based on pattern matching between the data profile from a laser rangefinder and an environment map, a method of constructing environment maps from 3D-CAD of a NPP, and a cableless robot system.

The authors describe the basic design of Fun-ARM, and discuss the strategy of the fault tolerance on distributed manipulator. The fault model is described, and assumptions in the system are discussed. The methods to realize fault tolerance are proposed, including methods for fault-detection, fault-localization and fault-containment.