• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.27 no.5
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• pp.438-444
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• 2016

In this paper, A real-time channel module which can apply the wireless propagation channel was developed using USRP and Lab-VIEW. When the proposed channel module is used in conjunction with the implemented HW(hardware) simulators for cognitive radio and frequency interference analysis and so on, it can increase the reliability about wireless propagation environments. In addition, the proposed module overcomes the limit of existing HW simulator that data transfer rate is limitative in communication system through the design of the inner parts. Along with this, it is possible to apply channel parameters necessary to estimate the easier communication performance. Also, this has the advantage that it can be flexibly applied in implementing the communication channel with the upcoming new scenarios. The proposed module can estimate the communication performance via constellation and BER using the implemented module.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.06a
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• pp.111-113
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• 2014

최근 해양사고에 따른 피해가 늘어남에 따라 선박의 안전항해에 대한 관심이 높아지고 있으며, 해양사고에 대한 규제 및 사고방지를 위한 기술의 개발도 활발하게 진행되고 있다. 이러한 요구에 따라 IT 기술들을 적용한 다양한 항해장비들이 개발되어 항해사의 안전운항을 지원하고 있지만, 다양하고 많은 정보를 무분별하게 제공하기 보다는 정보를 표시하고 서비스하는 효율적인 방법에 대한 연구가 더욱 필요한 실정이다. 효율적인 항해 장비는 항해사가 의사 결정을 신속하고 정확하게 내릴 수 있도록 보다 단순하고 직관적인 방법으로 정보를 표시할 수 있어야 하며, 본 논문에서는 선교에서 활용될 수 있는 증강현실 항해지원 시스템의 설계 및 구현에 대해 기술하고자 한다. 본문에서는 시스템을 카메라를 기반으로 하는 하드웨어 모듈과 실시간으로 증강영상을 생성하는 소프트웨어 모듈로 구분하여 설명하며, 선박운항 시뮬레이터를 이용한 시작품의 시험 평가 방법에 대해서도 언급한다. 이러한 증강현실 기반의 항해지원 시스템은 사고방지 및 운항효율 증대에 기여할 것으로 기대한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.1065-1066
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• 2015

화학공장, 플랜트 등 대형 기계설비 내에서 발생하는 각종 사고에 대한 대응훈련은 훈련시간 및 비용 증가, 훈련자의 안전 확보가 어렵고 반복적인 훈련 및 평가가 어렵기 때문에 실제 사고상황을 가상공간 내에 구현한 가상현실 기반 훈련 시뮬레이터의 필요성이 증대되고 있다. 본 논문에서는 시뮬레이터 훈련자 평가를 위하여 동작분석 기반 훈련자 평가 모듈을 개발하고 훈련평가에 활용하기 위하여 모션캡쳐 장비를 활용한 훈련 표준동적 DB를 구축하였다. 훈련자의 특정 동작을 구축된 DB를 활용하여 표준동작과의 비교를 통하여 효율적인 훈련을 위한 피드백과 함께 정량화된 평가점수 제공을 통해 정량적인 훈련평가에 활용할 수 있다. 또한 평가 결과의 시각화를 통해 직관적인 훈련개선이 가능하도록 하였다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1994.10a
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• pp.316-323
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• 1994

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.466-468
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• 2005

본 논문의 연구에서는 IEEE 802.l1e MAC (Medium Access Control) 프로토콜을 NS-2 등과 같은 저명한 시뮬레이터들보다도 진보적인 NCTUns 시뮬레이터를 이용하여 개발하였다. 구현한 시뮬레이레션 모듈을 기반으로 다양한 측면의 실험하여 그 성능을 검정하였고, 본 논문에서는 특히 EDCA (Enhanced Distributed Channel Access)의 성능 결정에 중요한 요인이 되는 주요 파라미터에 대해서 성능을 분석하였다.

• Journal of Korean Society of Transportation
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• v.21 no.4
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• pp.91-101
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• 2003

This study modeled 4-lane highway in three-dimensional virtual reality in order to overcome difficulties of field experiment. and the research subject was placed in a driving simulator. We survey the driver's cognitive characteristics to the alignment changes in the three-dimensional virtual reality highway. Especially, maximizing the identity of driving movements and virtual scenery on the basis of the data obtained by dynamic analysis module. we minimized simulator sickness for the graphic module of driving simulator. And we carried out cognitive evaluation on the basis of adjective words extracted by dictionary and the opinion of specialist. In this study LISREL model was used to detect the causal relation between geometry and safety in cognitive side, and found that geometric change affects the safety of drivers by static and dynamic road safety model in three-dimensional combined alignments. As the result, for constructing safety road. we consider drivers' cognitive characteristics as human factors in road design, and we think that they are very important factors to improve road safety.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.34 no.1
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• pp.103-109
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• 2006

In this paper, VDS(Vehicle Dynamics Simulator) and ACS(Attitude Control Simulator) are developed and are verified using PILS(Process In-the Loop Simulation) between VDS and ACS. VDS is including the AOCS(Attitude & Orbit Control Subsystem) hardware modeling of geosynchronous satellite and consists of modulation concept. ACS performs the attitude determination using sensor data and generates the attitude control commands. In order to transfer the data between VDS and PCDU(Power Control & Distribution Unit), data acquisition boards were mounted. VDS performance is verified using HILS(Hardware In-the Loop Simulation) between VDS and PCDU.

• Journal of the Korean Institute of Intelligent Systems
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• v.19 no.5
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• pp.661-666
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• 2009

Modular snake-like robots, which consist of series of modules, are robust for failure and have flexible locomotions for environment. However, they are difficult to control and few efficient and various locomotions are introduced yet. In this paper, GA based phase generation and trajectory generation approaches are implemented and compared for locomotion of snake-like robots and extended for analysis for selections of partial modules. In addition, modeling and simulation environments are implemented in Webots simulator and above GA based experiments for locomotion are executed for KMC snake-like robot.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.6
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• pp.86-94
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• 2019

This paper describes the development of unmanned vehicle remote control system which is configured with steering and accelerating/braking hardware to improve the sense of reality and safety of control. Generally, in these case of the remote control system, a joystick-type device is used for steering and accelerating/braking control of unmanned vehicle in most cases. Other systems have been developing using simple steering wheel, but there is no function of that feedback the feeling of driving situation to users and it mostly doesn't include the accelerating/braking control hardware. The technology of feedback means that a reproducing the feeling of current driving situation through steering and accelerating/braking hardware when driving a vehicle in person. In addition to studying feedback technologies that reduce unfamiliarity in remote control of unmanned vehicles, it is necessary to develop the remote control system with hardware that can improve sense of reality. Therefore, in this study, the reliable remote control system is developed and required system specification is defined for applying force-feedback haptic control technology developed through previous research. The system consists of a steering-wheel module similar to a normal vehicle and an accelerating/braking pedal module with actuators to operate by feedback commands. In addition, the software environment configured by CAN communication to send feedback commands to each modules. To verify the reliability of the remote control system, the force-feedback haptic control algorithms developed through previous research were applied, to assess the behavior of the algorithms in each situation.

• Proceedings of the KIEE Conference
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• 2008.04c
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• pp.230-232
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• 2008

본 논문은 정상상태에서의 태양광 PV 모듈의 출력특성을 가지며 일사량과 온도의 변화에 따라 가 변하는 I-V 곡선의 특성을 나타내는 태양광 어레이 시뮬레이터의 제작에 관한 연구 결과이다. 본 시뮬레이터는 태양전지의 I-V 곡선상의 동작점을 실시간으로 표시하여, 가변하는 일사량과 온도를 설정하는 유저 인터페이스를 Labview 프로그램으로 구현하였으며 직류 프로그래머블 전원장치(DC programmable power supply)를 GPIB로 연결하여 구현하였다. 정상 부하조건 뿐만 아니라 개방조건, 단락조건에서도 동작하는 태양전지 동작점 추적 알고리즘을 개발하였으며 실험을 통하여 제안한 알고리즘의 효용성을 확인하였다.