Shiro Tamaki

Parallel genetic algorithms on line topology of heterogeneous computing resources

This paper evaluates a parallel genetic algorithm (GA) on the line topology of heterogeneous computing resources. Evolution process of parallel GAs is investigated on two types of arrangements of heterogeneous computing resources: the ascending and descending order arrangement of computing capability. Their differences in chromosome variety, migration frequency and solution quality are investigated. The results in this paper can help to design parallel GAs in grid computing environments.

A parallel tabu search and its hybridization with genetic algorithms

The paper proposes two parallel meta-heuristics. One is a cooperative parallel tabu search which incorporates historical information exchange among processors in addition to its own searching of each processor. The other is a cooperative parallel search between genetic algorithm and tabu search processes. Through computational experiment, we observe the improvement of solutions by our proposed method.

Development of low cost educational material for learning fundamentals of mechatronics

In this study, we developed low cost educational material for learning fundamentals of mechatronics by well combining Arduino, Scilab/Xcos, and hardware modules. The availability of the developed educational material is verified by a practice example.

Development of a Hall element displacement sensor with artificial neural network for magnetic levitation control

In this study, we developed a Hall element displacement sensor to control magnetic levitation (maglev) systems. This sensor is devised to achieve lower-cost maglev systems. Furthermore, in order to more accurately obtain the gap between an electromagnet and a levitated object, artificial neural network (ANN) is applied to the developed sensor. Finally, the validity of the developed Hall element displacement sensor with ANN is verified using a real-time measurement software.

Development of Quality Control and Breeding Management System of Goats Based on Information and Communication Technology

In the context of the occurrence of infectious diseases in livestock and the increasing demand for animal products in the Asian region, it is necessary to establish information management systems for animal production and prevention of epidemics. In this study, we propose a next-generation information management system of animal production that utilizes information and communication technology such as RFID, cloud systems, and mobile communication network. Also, we conducted operational test of the information system by using goat as a model for the target animal in order to evaluate the requirements for the dissemination of the system and the remaining issues.

Molecular characteristics and prevalence of small ruminant lentiviruses in goats in Japan

Small ruminant lentiviruses (SRLVs), which comprise caprine arthritis-encephalitis virus (CAEV) and maedi-visna virus (MVV), are prevalent in goats and sheep worldwide, including in Japan. However, little is known about the molecular characteristics of goat lentiviruses in Japan. In this study, a molecular and phylogenetic analysis of the long gag region was performed. The phylogenic tree demonstrated that all samples belonged to SRLV subtype B1. Two clusters were identified, with one cluster distinct from previously reported strains of subtype B1. In addition, several alterations in the amino acid sequence were detected in immunodominant epitopes of the gag region. To gain a deeper understanding of the genetic diversity of SRLVs in Japan, it will be necessary to increase the sample size and conduct a broader survey. The present report is important for establishing baseline information on the prevalence of SRLV in Japan and providing data to develop a new, more sensitive diagnostic test for effective control of SRLV.

Application of full-duplex wireless communication system on echo cancellation

In this paper, we intend to realize the data trading between the mobile station and the base station with only one frequency and in simultaneous process. Until now for transmitting and receiving the data, the mobile station and the base station have been used two different frequencies. This is obvious that by using two different frequencies in transceivers side there would be no interferences in transceiver itself. Therefore, utilization of different frequencies in transceiver was common. However, in these days due to the rapid increase of mobile station users, utilized frequencies between mobile and base stations should be allocated efficiently. Otherwise, it would reduce the speed of data sending in mobile stations. In order to get rid of this problem utilization of the same frequency in transmitter and receiver side is suggested. In this research utilization of the same frequency is considered for the mobile and the base station. However, there are near end echo occurs in system. Meanwhile, the echo canceller is implemented in the suggested system in order to cancel near end signal. In this paper, the considered algorithms of Echo canceller are Least Mean Square, Normalized Mean Square and Recursive Least Square. As a consequence, Normalized Least Mean Square Algorithm performed sufficiently to maintain an adequate low learning curve of normalized mean square error.

Design of Adaptive Friction Control of Small-Scaled Wind Turbine System Considering the Distant Observation

The aim of this research is to reduce down the angular velocity against strong wind during the storm considering the distant observation. Our expectation of this small-scaled wind turbine is to operate continuously even in storm days. However, since the small-scaled wind turbine consists of small blade, it may exceed the limitation of angular velocity in storm condition due to the low inertia moment and consequences of centrifugal force. So it would be broken down the system. Our target is to somehow reduce down the angular velocity using the stall factor control. Stall factor control mainly used in the junction of axis of blade of wind turbines gear wheel. Subsequently, the stall factor is operated when the angular velocity exceeds the limitation. Therefore, adaptive controller is designed and in order to evaluate the angular velocity’s behavior phase space method is introduced. As consequences, the stall factor preserves the stability and angular velocity performs under desired value constantly.

Analysis of Non-linear Adaptive Friction and Pitch Angle Control of Small-Scaled Wind Turbine System

The aim of this research is toanalyze the behavior of wind turbine system for passive and adaptive resistance non-linear control. In general, the wind turbine system is generating energy from the revolution of blades. The revolution of blades is depended on the velocity of wind. So, if we have strong wind then the revolution of blade is increased and in consequently more energy will generated. Therefore, usually the wind turbine systems are located in gale area in order to generate energy efficiency. However, there are limits of the revolution of blades or the angular velocity of blades. If the angular velocity exceeds the limit then wind turbine system may breakdown. Thus in this paper, in order to avoid the malfunction of wind turbine system, adaptive and passive non-linear control of resistance is considered. As consequences, the adaptive resistance has more stable and smooth angular velocity compare to passive resistance.

Controller reduction using structurally balanced truncation method with new closed-loop structures

In this paper, we discuss controller reduction using structurally balanced truncation (SBT) method with new closed-loop structures. The most consequential disadvantage in SBT method is the problem for feasibility of Lyapunov inequalities for closed-loop systems and it still remain open to this date. The new closed-loop structures are introduced in order to relax the feasibility. Finally, a numerical example is used to verify the availability of the proposed methods.