• International Journal of Naval Architecture and Ocean Engineering
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• 제11권1호
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• pp.274-284
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• 2019

The control architectures of Chuan Suo (CS) deep submergence rescue vehicle are introduced. The hardware and software architectures are also discussed. The hardware part adopts a distributed control system composed of surface and underwater nodes. A computer is used as a surface control machine. Underwater equipment is based on a multi-board-embedded industrial computer with PC104 BUS, which contains IO, A/D, D/A, eight-channel serial, and power boards. The hardware and software parts complete data transmission through optical fibers. The software part involves an IPC of embedded Vxworks real-time operating system, upon which the operation of I/O, A/D, and D/A boards and serial ports is based on; this setup improves the real-time manipulation. The information flow is controlled by the software part, and the thrust distribution is introduced. A submergence vehicle heeling control method based on ballast water tank regulation is introduced to meet the special heeling requirements of the submergence rescue vehicle during docking. Finally, the feasibility and reliability of the entire system are verified by a pool test.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.545-552
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• 2008

To insure the quality and safety of ground anchors, pull-out test of anchor has to be done. In the individually controlled pull-out test system, pull-out device is used to introduce the same pull-out force to individual tendon that has a different length and a deflection. That is, that device has a separate pull-out oil jack to each tendon, thus the pull-out length of each jack is not the same, but that device introduces each tendon to the same pull-out force. In this study, the in-situ pull-out tests for the compression anchors were performed and its test results were analysed and compared to the results of center hole pull-out tests. In the case of pulling out each tendon using the individually controlled pull-out test device, the pull-out forces were distributed to a individual tendon. That device is excellent one that can solve the cause of unequal pull-out forces of each tendon appearing in the manufacture process and construction of anchors, and unequal pull-out forces due to the deferent length.

• Journal of Advanced Marine Engineering and Technology
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• 제16권5호
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• pp.29-38
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• 1992

This paper describes the general formulation for the in-plane longitudinal and flexural coupled free vibration analysis of a branched structure. The branched structure, which is mainly found in machine tools, pipeline systems and so on, has some crooked parts and subsystems. And it modeled as a distributed mass system. The superiority of the present method to the transfer matrix method in the computation accuracy and speed was confirmed by the numerical computation results. Moreover, we comfirmed that boundary and intermediate conditions have been controlled by the spring constants.

• 한국항행학회논문지
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• 제15권4호
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• pp.562-570
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• 2011

본 논문에서는 이동성을 갖춘 릴레이를 도입한 다중 셀 OFDM (Orthogonal Frequency Division Multiplexing)-TDD (Time Division Duplex) 시스템에서 각 셀의 수율을 개별적으로 최대화시키기 위한 분산형 이동 릴레이 전력 제어 방식 (Distributed Mobile Relay Power Control; DMRPC)을 제안한다. DMRPC 방식을 사용한 릴레이 시스템에서는 서로 다른 셀 간 협력과 그에 따른 시그널링 오버헤드 없이 각 셀에서 개별적으로 릴레이의 전력 레벨을 제어한다. DMRPC 방식을 사용한 시스템이 전력 제어 없이 릴레이를 사용한 최대 전력 릴레이 시스템과, 릴레이를 사용하지 않은 기존 시스템에 비하여 향상된 셀 수율 성능을 보이는 것을 모의 실험을 통하여 검증한다. 또한, 최대 전력 릴레이 시스템이 기존 시스템에 비해 셀 외곽 지역 평균 수율 성능이 떨어지는 반면, DMRPC 방식을 사용하면 기존 시스템에 거의 근접한 셀 외곽 지역 평균 수율 성능을 얻을 수 있는 것을 보인다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.570-573
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• 2004

This paper present a distributed RC lines (URCs) oscillator with sinusoidal output. The frequency of oscillator can be controlled and adjustable by varying an one pole amplifier. The circuit incorporated an gain controller loop for amplitude stabilization with low distortion. The realization of simulation and experimental results are in reasonably good agreement with the theoretical , and very low harmonic distortion. In this circuit can be suitable for LSI process fabrication and the circuit application in electronic communications system.

• 전기학회논문지
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• 제58권7호
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• pp.1263-1269
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• 2009

Stable and sustainable power supply means maintaining a certain level of power quality and service while securing energy resource and resolving environmental issues. Distributed generation (DG) has become an essential and indispensable element from environmental and energy security perspectives. It is known that voltage violation is the most important constraint for load variation and the maximum allowable DG. In distribution system, sending voltage from distribution substation is regulated by ULTC (Under Load Tap Changer) designed to maintain a predetermined voltage level. ULTC is controlled by LDC (Line Drop Compensation) method compensating line voltage drop for a varying load, and the sending voltage of ULTC calls for LDC parameters. The consequence is that the feasible LDC parameters considering variation of load and DG output are necessary. In this paper, we design each LDC parameters determining the sending voltage that can satisfy voltage level, decrease ULTC tap movement numbers, or increase DG introduction. Moreover, the maximum installable DG capacity based on each LDC parameters is estimated.

• 대한안전경영과학회지
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• 제1권1호
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• pp.145-157
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• 1999

In this paper, a research on the structure and the network configuration of the location register(LR), which database of new locations and service informations of subscribers according to the movement of subscribers in personal communication system(PCS). since the traditional PCS manages all the databases with the location informations as a centralized type. The service informations of the subscribers are centrally controlled by the HLR. So there have been the heavy signal traffic and the call setup delay. In order to relieve such problem, the proposed types of the configurations are the distributed type of PCS scheme and the hierarchical PCS scheme. In the distributed scheme, each PCS has its own LR and in the hierarchical PCS scheme, several LR are grouped to from a layer so that overall structure is a tree style.

• 한국조명전기설비학회지:조명전기설비
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• 제5권1호
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• pp.57-64
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• 1991

본 연구는 공장자동화에 이용되는 산업용 로봇의 분산 적응 제어기법을 고찰한 것이다. 이 제어기법은 메니폴레이터가 원하는 경로를 따라 진행할 때 부하의 변동에 신속히 대응할 수 있도록 함으로서 실시간 제어가 가능하게 하는 것이다. 제어방식은 전체 시스템을 규모가 작은 여러개의 부시스템으로 분리하고, 각 부시스템을 공칭제어기와 적응제어기로 제어하는 것이다. 이 제안한 기법을 컴퓨토 시뮬레이션한 결과 매니풀레이터 동력학이 비선형이며 부하변동이 있을 때에도 원하는 궤적에 양호하게 추종함을 알 수 있었다.

• 전력전자학회논문지
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• 제17권5호
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• pp.438-444
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• 2012

This paper deals with the active and reactive power control of Grid connected system. It was shown that active power and reactive power can be dependently controlled with two individually adaptable parameters. The two parameters are power angle and voltage magnitude. Transient state will occur with active or reactive power reference value variation. This paper presents a new control strategy for active and reactive power control of less interaction and improved transient response. The paper details the control technique by the mathematical and electrical network analysis of the methodology. The performance was verified through computer simulation using MATLAB Simulink and experiment.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.143-145
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• 2008

본 논문에서는 산간벽지 또는 낙도와 같이 중앙계통으로부터 송 배전선을 이용한 전력공급이 어려운 약 계통(Weak grid)에 주로 사용되는 계통연계형 분산전원시스템의 설계 방법을 설명한다. Weak grid에서는 계통의 전압변동의 폭이 매우 크기 때문에 부하에 안정적으로 정전압을 공급할 수 있는 전압제어형 전압원인버터(VCVSI: Voltage-Controlled Voltage Source Inverter)를 주로 사용한다. 따라서 본 연구에서는 계통의 전압에 변동에 따른 각각의 시스템 파라미터 특성을 분석하고 이에 따른 최적의 시스템 용량의 선정방법을 제시한다.