• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.1259-1265
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• 2004

Railway is an important transportation tool for nation's industrial development and public daily life. These days the concern about railway has remarkably been rising due to the April 2004 opening of KTX, Korea High Speed Rail, together with Trans-Continental Railways linking North Korea, China, Russia, through European countries. In the meantime, the issues of train safety and efficiency, arising from the different on-board signaling systems installed on different kinds of trains, have been raised incessantly. In this paper CTCS(Continental Train Control System) is suggested, which can accommodate such various signaling functions as ATP, ATC, ATS, etc. into one single type of on-board signaling system and operate without changing ground signaling systems on the junctions of the Trans-Continental Railways. The development of this CTCS would cause speed-up of exiting lines and possession of railway core solutions for establishing Northeast Asia logistics center bases, which could be an important cornerstone for domestic railway improvements and Korea's role of Northeast Hub.

• 한국항공우주학회지
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• 제32권4호
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• pp.101-110
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• 2004

2004년 9월 러시아 발사체 "디네플"에 의해 발사 예정인 초소형위성 HAUSAT-1의 비행 모델 개발이 완료되어 초소형위성 전개기 P-POD (Poly Picosatellite Orbital Deployer) 에 장착하기 위해 미국으로 이송할 예정이다. HAUSAT-1 위성개발을 통하여 설계, 제작 및 시험을 한 단일보드 탑재컴퓨터는 다른 초소형위성의 탑재컴퓨터와는 다른 고성능의 특성을 갖고 있다. 다기능의 컨트롤러와 SPI 와 1-Wire와 같은 최근의 접속기술을 사용하여 하니스의 단순화와 시스템의 크기 및 질량을 최소화 하였다. 또한 우주방사환경에 의한 장애 발생에 대처하도록 장애복구 시스템을 적용하였다. HAUSAT-1의 비행 모델용 탑재컴퓨터는 현재 모든 가능시험과 환경시험을 마친 상태이며, 본 논문에서는 이들 성능/기능시험 결과와 랜덤진동시험 및 열진공시험 결과를 논의한다.

• 전자공학회논문지B
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• 제33B권2호
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• pp.149-158
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• 1996

In this paper we describe designing and implementing a digital neural chip and a parallel neural machine for simulating large scale neural netsorks. The chip is a single-chip multiprocessor which has four digiral neural processors (DNP-II) of the same architecture. Each DNP-II has program memory and data memory, and the chip operates in MIMD (multi-instruction, multi-data) parallel processor. The DNP-II has the instruction set tailored to neural computation. Which can be sed to effectively simulate various neural network models including on-chip learning. The DNP-II facilitates four-way data-driven communication supporting the extensibility of parallel systems. The parallel neural machine consists of a host computer, processor boards, a buffer board and an interface board. Each processor board consists of 8*8 array of DNP-II(equivalently 2*2 neural chips). Each processor board acn be built including linear array, 2-D mesh and 2-D torus. This flexibility supports efficiency of mapping from neural network models into parallel strucgure. The neural system accomplishes the performance of maximum 40 GCPS(giga connection per second) with 16 processor boards.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 D
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• pp.2077-2078
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• 2006

This paper describes the development or a closed-loop Strapdown Attitude Reference System (SARS) algorithm integrated filtering estimator for determining attitude reference for railway and aviation system using fuzzy inference. The SARS consists of 3 single-axis rate gyms in conjunction with 2 single-axis accelerometers. For optimal values of fuzzy systems, we utilize on-line scheduling method for initial values and then use genetic algorithms for fine tuning. Implementation using experimental test data of unmanned aerial vehicle has been performed in order to verify the estimation. The proposed fuzzy inference based SARS demonstrate that more accurate performance can be achieved in comparison with conventional one. The estimation results were compared with the on-board vertical gyro as the reference standard.

• 한국정밀공학회지
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• 제13권9호
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• pp.114-129
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• 1996

This paper describes the whole development phase for the underwater vehicle actuating system with high hydroload torque disturbance. This includes requirement analysis, system modeling, control algorithm design, real time implementation, test and performance evaluations. As for driving control algorithms, fuzzy logic, variable structure and PD(Proportional-Differential) algorithm were designed and implemented on board controller using a single chip microprocessor. Intel 8797. And test and performance evaluation is carried out both single test and wystem integration test. We could confirm the basic performance of actuating system through the single test and gereral developing work of any actuating systems was finished with a single performance test of actuating system without system integration test. But, we suggested that system integration test be needed. System integration test is carried out using G/C HILS(Guidance and Control Hardware-In-the -Loop Simulation) which is constituted flight motion simulator, load simulator, real time host computer and the related subsystems such as inertial navigation system, power supply system and Guidance and Control Computer etc.. The most important practical contribution of this paper is that full system characteristics such as minimal control effort, enhancement of guidance and autopilot performance by the actuating system using G/C HILS technique are investigated. Through full running G/C HILS, in spite of the passing to single tests, some control algorithm resulted in failure as to stability of full system and system time frame.

• 한국항행학회논문지
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• 제16권6호
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• pp.910-919
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• 2012

본 논문에서는 고정익 무인항공기의 온보드 영상처리 시스템 개발에 대하여 개발과정에 대해 기술하고, 비행실험을 통한 실험결과를 토대로 하여 성능을 검증하고자 하였다. 시스템 개발보드는 ARM 프로세서가 탑재된 영상처리용 보드에 임베디드 리눅스를 포팅하였다. 목표물 추적을 위한 영상처리 알고리즘으로는 비교적 간단한 알고리즘인 색상 기반 알고리즘을 적용하여, 지상에 있는 특정 색상의 물체를 추적하도록 하였다. 개발된 시스템의 성능검증을 위해 실험실에서 제작한 무인항공기에 탑재하여 비행실험을 수행하였으며, 실시간 성능 향상을 위해 영상처리 알고리즘 및 임베디드 리눅스의 커널에 대한 최적화 작업을 수행하였다. 비행실험 결과, 4픽셀 이내의 오차범위에서 지속적으로 목표물을 추적하는 것을 확인하였다.

• 대한전자공학회논문지
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• 제21권5호
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• pp.79-89
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• 1984

본 논문에서는 마이크로프로세서를 이용한 8-channel 통계적 다중화기(SMUX)의 구현에 대하여 기술한다. 하드웨어는 S100-bus 비슷한 bus를 통하여 연결되어 있으며 4MHz clock의 Z -8OA 중앙처리장치기판, 프로그램 저장을 위한 16kbyte LOM기판, data저장을 위한 16Kbyte 동적 RAM 기판 및 세개의 입출력 장치로 구성되어 있다. 이 통계적 다중화기는 50bps에서 9600bps까지의 data를 취급하는 8-channel을 다중화 할 수 있고 한장의 입출력 기판을 제거하고 소프트웨어를 약간 수정하면 4-channel을 수용할 수 있다. 또한 본 장비는 CCITT 권장사항 X.25 link level, V.24, V.28, X.3 및 X.28을 따르고 있다. SMUX 주요특성은 4종류의 입력부호 즉 ASCII, EBCDIC, Baudot, Transcode를 취급할 수 있고 동적 buffer 운영방식과 자체진단 기능을 갖고 있으며, 전체 시스템을 동작시키는데 단지 하나의 CPU를 능률적으로 이용한다는 점이다. 이 시스템의 하드웨어 및 소프트웨어에 관한 자세한 사항은 본론에서 기술한다.

• 음성과학
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• 제8권2호
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• pp.73-81
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• 2001

In this paper, we focus on the real time implementation of the single channel adaptive noise canceller(ANC) by using TMS320C30 EVM board. The implemented single channel adaptive noise canceller is based on a reference paper [1] in which it is simulated by using the recursive average magnitude difference function(AMDF) to get a properly delayed input speech on a sample basis as a reference signal and normalized least mean square(NLMS) algorithm. To certify results of the real time implementation, we measured the processing time of the ANC and enhancement ratio according to various signalto-noise ratios(SNRs). Experimental results demonstrate that the processing time of the speech signal of 32ms length with delay estimation of every 10 samples is about 26.3 ms, and almost the same performance as given in [1] is obtained with the implemented system.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2006년도 춘계학술발표회 논문집
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• pp.47-52
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• 2006

In recent years, there is a strong urge to introduce GPS systems which can role in reference points and measure global positions to the field of structural measurements. In this study, a new structural measurement system using low-cost L1 single frequency GPS receivers instead of conventional expensive RTK L1&L2 dual frequency GPS receiver. This system consists of GPS OEM board, GPS antenna, wireless access points, and monitoring program based on Lambda method and makes it possible to apply to monitor a static behavior of large scaled Infra-structures, such as dams, tall buildings, road slops.

• 한국정밀공학회지
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• 제10권4호
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• pp.227-235
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• 1993

In this paper, the development of a high performance flexible controller is described. The hardware of the controller, based on VME-bus, consists of four M68020 single-board computers (32-bit) with M68881 numerical coprocessors, two M68040 single board donputers, I/O devices (such as A/D and D/A converters, paraller I/O, encoder counters), and bus-to-bus adaptor. This software, written in C and based on X-window environment with Unix operating system, includes : text editor, compiler, downloader, and plotter running in a host computer for developing control program ; device drivers, scheduler, and mathemetical routines for the real time control purpose ; message passing, file server, source level debugger virtural terminal, etc. The hardware and software are structured so that the controller might have both flexibility and extensibility. In papallel to the controller, a three degrees of freedom kinematically redundant robot has been developed at the same time. The development of the same time. The development of the robot was undertaken in order to provide, on the one hand, a computationally intensive plant to which to apply the controller, and on the other hand a research tool in the field of kinematically redundant manipulator, which is, as such, an important area. By using the controller, dynamic control of the redundant manipulator was successfully experimented, showing the effectiveness and flexibility of the controller.