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Experimental Evaluation on Effect of Steering Reactive Torque of SBW Vehicle on Driving Behavior
Toshihiro Hiraoka,Hidenori Kusabe,Hiromitsu Kumamoto 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Steering reactive torque presentation is important for drivers of a steer-by-wire(SBW) vehicle to inform of the driving environment such as the road surface condition and the working state of the SBW controller. However, we have to solve the problem how to decide the steering reactive torque gain. Therefore, in the present paper, the driving simulator experiments which simulate the actual driving environment are performed to verify the effect of the steering reactive torqueo the driving behavior and the subjective evaluation.
Real-time Path Planning Method for Multiple UASs
Toshihiro Takebayashi,Makiko Ishii,Shin-Ichiro Higashino 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
The authors have proposed a method for the path planning of an Unmanned Aircraft System (UAS) and the simultaneous optimization of task assignment for multiple UASs using Evolutionary Computation (EC). This paper present a fast path planning method named Simplified Rule-Base EC hybrid (SRBEC) method and a fast task assignment method named Radial Segmentation Task Assignment (RSTA) method in order to use in real time. It also reports the results of the real-time simulations for the evaluation of RSTA and SRBEC methods.
A CPU Usage Control Mechanism for Processes with Execution Resource for Mitigating CPU DoS Attack
Toshihiro Tabata,Satoshi Hakomori,Kazutoshi Yokoyama,Hideo Taniguchi 보안공학연구지원센터 2007 International Journal of Smart Home Vol.1 No.2
In a ubiquitous environment, the hardware resources are limited; thus, an appropriate resource management mechanism is required for guaranteeing its processing activity. However, most operating systems (OSs) lack an access control mechanism for CPU resources to guarantee satisfactory processing and to safeguard the system from malicious attacks that affect the CPU resources, resulting in denial of service (DoS). Access control is not intended for CPU resources, which are important for the execution of a program. As a result, OSs cannot control the usage ratio of CPU resources. In this paper, we propose an access control model for CPU resources based on an execution resource. The proposed model can control the usage ratio of CPU resources appropriately for each user and each program domain. This execution resource can be applied to mitigate DoS attacks. In order to evaluate the effectiveness of the proposed method, we describe the results of a basic performance experiment and a DoS simulation experiment employing the Apache web server. From the results, we show that the proposed method can mitigate DoS attacks and does not have bad effects upon the performance of a target service.
Power-Electronics Contributing to the Green and Clean World
Toshihiro Sawa,Tsuneo Kume,Hidenori Hara,Mahesh Swamy 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Invention of the electric motor has since, spurred its wide spread application to convert electrical energy in to mechanical work. As its usefulness grew, engineers were challenged to develop control techniques to match the speed and torque of the motor to that of the driven load to achieve optimal performance. The advent of Power Electronics was crucial in achieving variable speed operation of motors. Hence, it can be said that Power Electronics has contributed to the prosperity of today’s worldwide economy and allowed people to lead a joyous and peaceful life. However, at the same time, the amount of electrical energy consumed by electric motors accounts for the We have to be aware of this fact and its consequential influence on global warming. This paper discusses variable speed motors drives. It reviews Yaskawa’s contribution to industrial inverter drives and introduces a technology road map to realize a “Greener World” with all its future prospects.
Toshihiro Shinohara 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In this paper, an expression method of each individual woven yarn of textile fabric is proposed for structure analysis of textile fabric on its three-dimensional (3D) image obtained by X-ray computed tomography (CT) images. In this method, the voxels of the 3D CT image is segmented into each yarn based on the yarn positional information, which is the sequence of the yarn center points. In order to extract the yarn positional information, the directions of the filaments are firstly estimated at all the voxels of the 3D CT image by correlating the voxel values with a filament model. Each filament is secondly reconstructed by connecting the voxels of the filaments based on the estimated filament directions. Each yarn is then reconstructed by binding up the reconstructed filaments using a newly defined distance between two filaments. Finally, the yarn positional information is obtained by thinning the reconstructed yarns. The voxels of the 3D CT image is segmented into each yarn based on a newly defined dissimilarity to the extracted yarn positional information. Using the segmented voxels, each individual yarn is expressed with volume rendering. The effectiveness of the proposed yarn expression method is discussed by experimentally applying this method to 3D image of a plain knitted fabric.
Toshihiro Suzuki,Ashiq Khan,Motonari Kobayashi,Wataru Takita 보안공학연구지원센터 2008 International Journal of Hybrid Information Techno Vol.1 No.2
The limited battery resource of mobile devices is an endless problem. The conventional solution, improving battery technologies, is insufficient; we need alternative energy sources to enhance mobile lifetimes. One solution is to utilize cars as intermediate nodes in mobile ad hoc networks. However, the high velocities of cars may seriously degrade network quality. To overcome this, we need an efficient routing protocol that can establish stable routes even if moving cars are used as network components. This paper conducts simulations to evaluate the impact of high speed cars and proposes a novel technology that allows routing to consider vehicle velocity. Extensive simulation results are presented to show the efficiency that can be achieved by our proposal.