Solving Traveling Salesman Problem Using Ising Spin Model

IEEJ Transactions on Electronics, Information and Systems, 1996

INFRASTRUCTURE PLANNING REVIEW, 2002

Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management)

Ieej Transactions on Power and Energy, 2005

In AC electric Railway, three-phase voltage is changed into the single-phase circuit of two circuits with the Scottconnected transformer. If it becomes large unbalancing of the load between single-phase circuits, voltage fluctuation becomes large on three-phase side. Then, Railway Static Power Conditioner (RPC) was developed for the purpose of controlling voltage fluctuation on three-phase side. An RPC is comprised of a pair of self-commutated PWM inverters. These inverters connect the main phase and teaser feeding buses, coupled with a DC side capacitor such as a Back-To-Back (BTB) converter. In this way, the two self-commutated inverters can act as a static var compensator (SVC) to compensate for the reactive power and as an active power accommodator from one feeding bus to another. 20 MVA/60 kV RPCs started commercial operation in 2002 at each two substations on the newly extended Tohoku Shinkansen for compensating voltage fluctuation on three-phase side caused by traction loads, absorbing harmonic current. The results of operational testing indicate that an RPC can accommodate single-phase loads such as those of PWM-controlled Shinkansen and thyristor phase-controlled Shinkansen, and handle the exciting rush current of transformers, as well as compensate for harmonics successfully.

Transactions of The Japanese Society for Artificial Intelligence, 2002

In this paper, we propose a new method to deal with continuously varying quantity in the situation calculus based on the concept of the nonstandard analysis. The essential point of the method is to devise a new model called nonstandard situation calculus, which is an interpretation of the situation calculus in the set of hyperreals. This nonstandard model allows discrete but uncountable (hyperfinite) state transition, so that we can describe and reason about the continuous dynamics which are usually treated with differential equations. In this enlarged perspective of the nonstandard situation calculus, we discuss about an infinitesimal action, infinite plan and an abnormality theory for the temporal prediction based on the differentiability.

Transactions of the Japanese Society for Artificial Intelligence, 2016

Controlling the trade-off between the costs of disposal and losses of stock shortage have been one of the big management issue in retail stores, especially in convenient stores dealing many products of short expiration date. In this study, we aimed to evaluate the maximum gross profit and to analyze transition of waste costs and losses of purchasing opportunities in a retail store. We have developed a model of a retail store which performs simple three types of demand estimation and three types of ordering, and also created a model of customers which reflects consumer reactions to out-of-shelf situations such as brand switches and cancel purchasing by using actual Pointof-Sales and stock data. As a result of experiments by agent-based simulation, we obtained the order quantity to maximize the gross profit when the retail store made quantitative ordering. Moreover, we found that providing thresholds in minimum order amount increased gross profit and reduced losses of shortage. Finally, the combination of the demand estimation by using exponential smoothing and the threshold ordering made better performance than any other method.

Transactions of The Japanese Society for Artificial Intelligence, 2011

Analysis of Reward Programs in Membership Services Using Agent-based Simulation

The Journal of Japan Institute of Navigation, 2001

The recent incredable development of high speed computer made it possible that many controllers which were theoretically possible but impQssible to imp 王 ement ， is actually applied to many plant control problems ． The Bryson − Ho variable gain algorithm 〔 1 〕 is one of such algorithms ． In this paper ， the Bryson − Ho algorithrn which was described in their famous book Apl) lied Qptimal Control is applied to the course keeping problem and the course changing one for a rniddle type of training ship ， ' ShiQji Maru ' ． In order to assess this method ， sQme simulatiQns using a sQphisticated

SOCIOTECHNICA, 2003

JOURNAL OF RURAL PLANNING ASSOCIATION, 2010