Akitoshi Shimura

A QoS Management Technique of Urgent Information Provision in ITS Services Using DSRC for Autonomous Base Stations

A QoS management technique based on an autonomous decentralized mobility system, which is an autonomous decentralized system enhanced to provide mobile stations with information about urgent roadway situations, is proposed in this paper. This technique enables urgent messages to be flexibly and quickly transmitted to mobile stations by multiple decentralized base stations using dedicated short range communication. It also supports the easy addition of additional base stations. Each station autonomously creates information-delivery communities based on the urgency of the messages it receives through the roadside network and the distances between the senders and receivers. Each station dynamically determines the urgency of messages according to the message content and the speed of the mobile stations. Evaluation of this technique applied to the Smart Gateway system, which provides driving-assistance services to mobile stations through dedicated short-range communication, demonstrated its effectiveness and that it is suitable for actual systems.

A violin playing algorithm considering the change of phrase impression

The study focuses on the dynamics of KANSEI information and aims to propose an algorithm of motion planning using KANSEI. Concretely, the violin playing is regarded as the target motion which will be greatly influenced by KANSEI. The study introduces a multi-agent algorithm in which four physical bowing parameters are agents to adapt the impression transition smoothly, while maintaining the relationships between the parameters. We realized the violin performance suitable for the timbre words by introducing the proposed agent algorithm into the bowing machine developed in this research. As a result of the experiments, it was confirmed that there were various playing performances according to a single impression transition.

A proposal of Quality of Service (QoS) control method to realize highly-reliable communications for roadside system

In this study, we consider a chained computing system - a system that includes a large number of base stations, each with a very narrow communication area, that cooperatively deliver various services to mobile terminals in vehicles moving, at high speed. In operation, several autonomous base stations dynamically form themselves into a group on the basis of a service scenario received from a mobile terminal and profiles that describe the characteristics and the capabilities of each autonomous base station and autonomously deliver different kinds of services to the mobile terminal. First, we explain the basic model of a chained computing system and describe high-assurance, high-performance, and high-quality architectures that can be used for service delivery to a mobile terminal moving at high speed. Second, we discuss a Quality of Service (QoS) control method applied through these architectures to the roadside system, which is a component of the smart gateway system proposed by the Telecommunication Advancement Organization of Japan (TAO). We also discuss evaluation results concerning the QoS control method.

A Study on Migration Technique Using Program Slicing for Large-Scale Information and Control Systems

The software structure of large-scale information and control systems, such as that for railway and electronic power systems, becomes more and more complicated with all the modifications over long time use. Extension development is made without fixing the existing source code in order to maintain the existing functions. As a result, the source code for the data and data access are scattered throughout the program, and thus, it is difficult to modify them. We present a technique that can be easily modified in this paper to migrate the software structure. For this purpose, we focus on the program composition of information and control systems. These systems monitor facilities, check for differences between the planning and actual situations, and decide on the output to the facilities. This means the data access is composed of planning and facility data. The migration technique extracts the access codes for the planning and facility data from the existing source code using program slicing, and identify them by analyzing the relation of the data access codes. This enables us to manage them so that they do not re-scatter. We applied this technique to actual system software and confirmed its effectiveness.