Masamori Kashiyama

A route search method for electric vehicles in consideration of range and locations of charging stations

In this paper, we propose a new route search method for electric vehicles (EVs), which calculates a route with stopping over charging stations to have extra battery charge when current remaining charge is not enough to reach the destination. In this method, firstly we divided cases into three; the case of reaching the destination straight from the departure point, the case of stopping at one charging station and the case of stopping at several charging stations. In the cases of stopping over at least one charging station, potential charging stations are selected first, and then a route is obtained by Dijkstras algorithm from routes with some of those stations. Travel distance, estimated travel time between charge stations and time to fully charge after the EVs arrival at each charging stations are calculated and also used for the calculation of travel cost between charging stations. Offering these routes for EV users will eliminate some of the major concerns about EVs such as limited range or sparse charging stations and will contribute to the spread of EVs. In order to confirm appropriateness of the route and examine the impact of increased execution time by this method, authors implemented the method and compared its execution time with that of conventional route search method. As a result, we confirmed that this method calculates routes with accessible charging stations according to the EVs range. We also found that the search of charging stations with this method requires extra execution time, but the time increases by less than a half of the time required for the search of the route with some of these stations by conventional method.

A study on user authentication infrastructure for next generation telematics

To receive a telematics service, it must first be authenticated, and each automobile (or car navigation system) has typically been linked to a particular vehicle owner who could authenticate such services. However, an increasing number of drivers use cars that are rented, leased, or obtained through a car-sharing program; in such cases, the present form of car authentication is insufficient. A better system would authenticate the individual who is using a car at a particular time, but is not necessarily the owner. In this paper, we propose a personal authentication infrastructure for next-generation telematics. Specifically, we propose personal authentication into that (1) between the person and the terminal, (2) between the terminal and the center.

A 1.5-ns cycle-time 18-kb pseudo-dual-port RAM with 9K logic gates

An 18-kb RAM with 9-kgate control logic gates operating during a cycle-time of 1.5 ns has been developed. A pseudo-dual-port RAM function is achieved by a two-bank structure and on-chip control logic. Each bank can operate individually with different address synchronizing the single clock. A sense-amplifier with a selector function reduces the reading propagation time. Bonded SOI wafers reduce the memory-cell capacitance, and this results in a fast write cycle without sacrificing /spl alpha/-particle immunity. The chip is fabricated in a double polysilicon self-aligned bipolar process using trench isolation. The minimum emitter size is 0.5/spl times/2 /spl mu/m/sup 2/ and the chip size is 11/spl times/11 mm/sup 2/. >

A study on an authentication infrastructure between terminal and asp for next generation telematics

To receive a telematics service, it must first be authenticated, and each automobile (or car navigation system) has typically been linked to a particular vehicle owner who could authenticate such services. However, an increasing number of drivers use cars that are rented, leased, or obtained through a car-sharing program; in such cases, the present form of car authentication is insufficient. A better system would authenticate the individual who is using a car at a particular time, but is not necessarily the owner. In this paper, we propose a personal authentication infrastructure for next-generation telematics. Specifically, we propose authentication infrastructure between the terminal and the service provider (ASP).