• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.28-30
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• 2001

실시간 조건이 포함된 대용량 멀티미디어 데이터 서비스의 특성을 이해하기 위해서는, 이들이 저장되는 하드디스크의 성능을 평가할 수 있는 도구가 필요하다. 본 논문에 기술된 하드디스크 드라이브(Hard Disk Drives: HDD) 시뮬레이터는 PC 기반 FreeBSD UNIX 환경하에서 개발되었다. 본 시뮬레이터를 이용하여 실험 대상 하드디스크의 탐색 시간(seek time)과 sustained rate를 측정하였으며, video-on-demand(VOD) 서비스 실험에서는 실험 대상 하드디스크의 성능 병목구간의 파악을 통하여, VOD 서비스에 적합한 하드디스크 특성을 파악하였다.

• Journal of the Korea Society for Simulation
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• v.17 no.2
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• pp.91-103
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• 2008

In order to simulate the behavior of automated manufacturing systems, the performance of material handling systems should be measured dynamically. Multi-Agent technology could be well adapted for the development of simulator for distributed and intelligent manufacture systems. A multi-agent system is composed of one coordination agent and multiple application agents. Issues in AGVS simulator can be classified by the set-up and operating problems. Decisions on the number of vehicles, bi- or uni-directional guide-path, etc. are fallen into the set-up problem category, while deadlock tree algorithm and conflict resolution are in operating problem. In this paper, a multi-agent based deadlock-free simulator for automated guided vehicle system(AGVS) are proposed through the use of multi-agent technologies and the development of deadlock-free algorithm. In this AGVS simulator proposed, well-known Floyd algorithm is used to create AGVS Guide path, through which AGVS move. Also, AGVs avoid vehicle conflict and deadlock using check path algorithm. And Moving vehicle agents are operated in real-time control by coordination agent. AGV position is dynamically calculated based on the concept of rolling time horizon. Simulator receives and presents operating information of vehicle in AGVS Gaunt chart. The performance of the proposed algorithm and developed simulator based on multi-agent are validated through set of experiments.

• Proceedings of the Korea Society for Simulation Conference
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• 2002.05a
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• pp.109-114
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• 2002

현재 게임시장에서는 사용자가 직접 게임을 체험하는 체감형 게임기가 활발히 개발되고 있다. 대다수의 제품들은 운동을 재현하기 위하여 6개의 축으로 이루어진 Stewart 형의 모션 플랫폼을 사용하고 있다. 본 연구개발에서 시도되고 있는 게임기는 모션이 가미된 콘솔형 아케이드 시뮬레이션 게임기에 해당되는데, 인간의 감성인자중 운동감성에 바탕을 둔 운동 재현을 고려하여 워시아웃(Washout) 알고리즘을 적용하였고, 일반적으로 6개의 축으로 구현하는 운동 자유도를 짐발(Gimbal)형으로 재현하고자 하였다. 또한 실시간 스케줄러와 H/W 입출력 및 통신 드라이버에 대한 개발을 수행하였으며, 게임용 실시간 시뮬레이션에 적합한 정확도와 실시간성을 유지하도록 롤러코스터 상에서 이루어지는 차량운동이 모델링 되었다. 특히, 연구사례를 찾기 어려운 짐발형 운동판에 대한 워시아웃 필터를 시뮬레이터 탑승자의 감성공학적 특성을 반영할 수 있도록 설계하였다.

• The Journal of the Acoustical Society of Korea
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• v.23 no.1
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• pp.17-23
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• 2004

The mobile radio channel can be simulated as a complex-valued random process with narrow-band spectrum. This paper describes a real-time implementation of that process using a INS320C6414 digital signal processor and XC2VP30 Virtex FPGA. The simulator presented here is not only a comprehensive model of the flat fading but also frequency selective fading mobile channel conditions. To replicate the statistical characteristics of the multipath fading environment with the minimum computational burden, multi-rate techniques are employed to resolve practical problems such as variable sampling rate. The simulator produces accurate and consistent results due to digital implementation. It is very flexible and simple to program for various field conditions in mobile communications with a graphical user interface.

• JOURNAL OF ELECTRICAL WORLD
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• s.295
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• pp.23-33
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• 2001

• Proceedings of the Korean Nuclear Society Conference
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• 1998.10a
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• pp.195-195
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• 1998

• KEPCO Journal on Electric Power and Energy
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• v.2 no.1
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• pp.5-7
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• 2016

• 전기의세계
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• v.67 no.7
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• pp.30-33
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• 2018

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.41 no.5
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• pp.48-54
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• 2012

• Journal of Korea Multimedia Society
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• v.11 no.8
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• pp.1146-1159
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• 2008

This paper proposes a method for determining material property of a haptic model which represents the haptic behavior of a target object. This paper also presents a haptic rendering framework. We adapt elastography to obtain the physical property of a target object. One of the key differences between the proposed framework and a traditional method is that the physical property of the target object can be easily set into a haptic model. For evaluating the proposed method, we construct a real-time palpation prototype simulator. In our work, a human liver is selected as a target object and the liver is represented by Shape-retaining Chain Linked Model(S-chain model) for satisfying the real-time performance. We conduct experiments whether a user easily distinguishes abnormal portions from normal portions. From the experimental results, we evaluate that the proposed method provides the discriminable force to users in real-time.