• 한국철도학회논문집
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• 제11권6호
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• pp.575-580
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• 2008

고속철도 건설시, 선로중심 간격 및 시공기면폭의 감소는 건설비용의 절감을 가져온다. 그러나, 선로중심 간격의 축소는 열차 주행 풍압의 증가로 여러 가지 안전성 문제를 야기 할 수 있으므로 기술적 검토와 공기역학적 연구가 수행되어야 한다. 본 연구에서는 호남고속철도에 적합한 선로 중심간격을 검토하는데 필요한 차량 주행 안전성을 해석하기 위하여 선로중심 간격 변화로 인한 교행 열차 풍압을 예측하였으며, 이를 선로변 현장 실험 결과를 토대로 공력 영향을 평가하였다.

• 항공우주기술
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• 제12권1호
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• pp.87-93
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• 2013

달 착륙선 개념설계형상 검증모델은 한국형 달착륙선의 진보된 우주 비행체 기술들의 개발 및 검증을 위한 시험베드로서 개념설계형상을 바탕으로 달과 지구의 중력 차이를 고려하여 실제 중량의 1/6 스케일로 설계된 수직이착륙이 가능한 달착륙선의 프로토타입이다. 검증모델은 지상에 고정된 상태에서 추력기 클러스터링 시험과 가상비행시험을 수행하였다. 검증모델 지상시험은 두 달 동안 고흥항공센터 고체모터연소 시험장에서 진행했다. 검증모델의 지상시험의 목적은 비행모델 탐사선의 개발 이전에 주요 전자장비, 200N급 추진시스템, 제어 알고리즘 및 소프트웨어, 구조체의 핵심기술 및 체계운용기술 등의 전체 시스템에 대한 시연 및 검증이다. 본 논문에서는 시험형상, 시험목적 그리고 시험제반시설에 대한 기술을 포함한 가상비행시험에 대한 내용을 기술한다.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
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• pp.347-350
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• 2006

Maritime and Ocean Engineering Research Institute (MOERI), a branch of KORDI, has designed and manufactured a model of an autonomous underwater vehicle (AUV) named ISiMI(Integrated Submergible for Intelligent Mission Implementation). ISiMI is an AUV platform to satisfy the various needs of experimental test required for development of challenging technologies newly investigated in the field of underwater robot; control and navigational algorithms and software architectures. The main design goal of ISiMI AUV is downsizing which will reduce substantially the operating cost compared to other vehicles previously developed in KORDI such as VORAM or DUSAUV. As a result of design and manufacturing process, ISiMI is implemented to be 1.2m in length, 0.17m in diameter and weigh 20 kg in air. A series of tank test is conducted to verify the basic functions of ISiMI in the Ocean Engineering Basin of MOERI, which includes manual control with R/F link, auto depth, auto heading control and a final approach control for underwater docking. This paper describes the implementation of ISiMI system and the experimental results to verify the function of ISiMi as a test-bed AUV platform.

• International Journal of Automotive Technology
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• 제7권1호
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• pp.83-90
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• 2006

The purpose of this paper is to describe the design and implementation of an unmanned ground vehicle, called the TailGator at CIMAR (Center for Intelligent Machines and Robotics) of the University of Florida. The TailGator is a gas powered, four-wheeled vehicle that was designed for the AUVSI Intelligent Ground Vehicle Competition and has been tested in the contest for 2 years. The vehicle control model and design of the sensory systems are described. The competition is comprised of two events called the Autonomous Challenge and the Navigation Challenge: For the autonomous challenge, line following, obstacle avoidance, and detection are required. Line following is accomplished with a camera system. Obstacle avoidance and detection are accomplished with a laser scanner. For the navigation challenge, waypoint following and obstacle detection are required. The waypoint navigation is implemented with a global positioning system. The TailGator has provided an educational test bed for not only the contest requirements but also other studies in developing artificial intelligence algorithms such as adaptive control, creative control, automatic calibration, and internet-base control. The significance of this effort is in helping engineering and technology students understand the transition from theory to practice.

• 에너지공학
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• 제22권2호
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• pp.96-104
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• 2013

석탄가스화 기술은 청정석탄에너지 기술 중에서 아주 중요한 대안으로 인식되고 있으며, 이에 전 세계적으로 차세대 석탄가스화기라고 할 수 있는 고효율 저비용 석탄가스화기를 개발하고 있다. 본 연구에서도 이러한 목적의 달성을 위하여 저비용으로 구현이 가능한 컴팩트 석탄가스화기를 개발하고 있으며, 다수개의 공급부로 이루어진 일체형 이중선회형 버너를 개발하였다. 개발된 버너의 가스화 운전조건을 확보하기 위하여 미분탄 분배기와 함께 기존의 석탄가스화기 몸체에 설치하여 가스화 실험을 수행하였다. 인도네시아산 아역청탄인 ABK 탄을 사용하여 1.5톤/일의 파일럿 규모로 $6.4{\sim}7.2kg/cm^2$, $1170{\sim}1300^{\circ}C$ 조건에서 운전을 수행하였다. 우선 성능평가보다는 안정적인 가스화기 운전조건을 확보하는데 중점을 두었다. 그 결과, 안정적인 운전조건에서 탄소전환율은 84.0%, 냉가스 효율 52.1%를 확보할 수 있었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.716-717
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• 2011

This paper presents the overview of development of substation automation system. The prototypes of SA system are developed in first phase, and being enhanced the performance in second phase. In this research, the project was classified into three projects which are the development of intelligent electronic devices, the development of operation system and communication network in substation, and the development of technology to verify the compatibility of IEC 61850. As a result of this research, the domestic-made SA system are operated and tested for the performance in 154kV substation and/or test-bed in KEPCO PT Center.

• International Journal of Control, Automation, and Systems
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• 제5권5호
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• pp.515-525
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• 2007

In this paper, we develop a co-design methodology of stochastic optimal controllers and network parameters that optimizes the overall quality of control (QoC) in networked control systems (NCSs). A new dynamic model for NCSs is provided. The relationship between the system stability and performance and the sampling frequency is investigated, and the analysis of co-design of control and network parameters is presented to determine the working range of the sampling frequency in an NCS. This optimal sampling frequency range is derived based on the system dynamics and the network characteristics such as data rate, time-delay upper bound, data-packet size, and device processing time. With the optimal sampling frequency, stochastic optimal controllers are designed to improve the overall QoC in an NCS. This co-design methodology is a useful rule of thumb to choose the network and control parameters for NCS implementation. The feasibility and effectiveness of this co-design methodology is verified experimentally by our NCS test bed, a ball magnetic-levitation (maglev) system.

• ETRI Journal
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• 제29권4호
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• pp.489-496
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• 2007

As pervasive computing is widely adopted and reliable networks are becoming more easily accessible, there is a rapidly growing need to develop a mechanism to analyze and evaluate the performance of ubiquitous environments. This paper presents an information processing model which characterizes a ubiquitous environment where a variety of pieces of information need to be exchanged among devices within a system. The proposed model not only provides analytical tools to evaluate the performance of devices, but also makes it possible to identify key factors in designing a ubiquitous environment. For illustrative purposes, a test bed is constructed and the performance of the system is assessed based on the proposed model.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.1937-1942
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• 2007

Bimodal tram is being developed to be completed in 2010 and the infrastructure needs to be developed to make the operation in time. Through the study of infrastructure reflecting domestic condition, dedicated lane, station, connection center, automated operation, precise docking, ticketing system, information system, management system for operation and maintenance, and refueling station will be developed and their performances will be also verified through the construction of test bed. The economical, safe and environment-friendly operation of the bimodal tram will be established through the present study.

• Smart Structures and Systems
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• 제1권2호
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• pp.121-140
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• 2005

This paper presents a systematic investigation of the effect of sensor location on the data quality and subsequently, on the effectiveness of machine health monitoring. Based on an analysis of the signal propagation process from the defect location to the sensor, numerical simulations using finite element modeling were conducted on a bearing test bed to determine the signal strength at several representative sensor locations. The results showed that placing sensors closely to the machine component being monitored is critical to achieving high signal-to-noise ratio, thus improving the data quality. Using millimeter-sized piezoceramic plates, the obtained results were evaluated experimentally. A comparison with a set of commercial vibration sensors verified the developed structural dynamics-based sensor placement strategy. It further demonstrated that the proposed shock wave-based sensing technique provided an effective alternative to vibration measurement, while requiring less space for sensor installation.