• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2011년도 춘계학술대회
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• pp.769-770
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• 2011

본 논문에서는 정보기술 시스템온칩을 구성하는 방법을 제안하였다. 시스템온칩을 구현하기 위해 설계자는 IP의 재사용을 염두해 두어야 한다. IP 블록은 미리 설계되어지고 검증되기 때문에 설계자는 개별 부품의 올바름과 수행에 대해 거정을 하지 않아도 된다.또한, 정보기술 시스템온침의 임베디드된 코어는 시스템 레벨의 테스트 메카니즘을 호출하여 사용한다. 실제에 있어, IP 블록을 사용하여 조립할 때 아직까지는 error-prone, labor-intensive, time-consuming 과정을 사용한다. 본 논문에서는 시스템온칩 설계자가 IP 블록과 툴을 사용하는 것에 �X점을 맞추었다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1999년도 제14차 학술회의논문집
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• pp.37-40
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• 1999

ETRI has successfully completed and delivered to KARI the KOMPSAT Mission Control System. This system was designed to work in the conventional TT&C modulation scheme with the pre-assigned frequencies. As a way to accelerate in catching up with future TT&C technology evolutions, a preliminary study needs to be carried out to prepare for the development of a spread spectrum applicable to TT&C. A brief study was carried out to review some points to be considered in designing and implementing spread spectrum schemes to the ground TT&C system intended for a LEO spacecraft. Also a simulation and link design revisit was performed to see the operational and technical benefits with the KOMPSAT TT&C parameters. An experiment concept is proposed to test as many functions at a time once the prototype is developed. In this configuration, a ground-model TT&C transponder is connected via LAN to the ETRI-developed KOMPSAT S/W simulator and linked to the KOMPSAT TM/TC processing s/w via spread spectrum signals through a GEO satellite bent-pipe link. A satellite data relay link simulation could be carried out in this configuration.

• 상하수도학회지
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• 제29권6호
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• pp.659-666
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• 2015

In this study, Hazen-Williams C value of pipes in wide waterworks system was estimated and statistically analyzed. Hazen-Williams C value of water pipe was predicted after 20 years of service period. From the results, it was found that C value of water pipe for treated water maintained higher value of 110 after 20 years of installation. Furthermore, it was found that velocity coefficients of steel pipe for less than and more than 20 years of installation were 117.7 and 109.3, respectively. C value of ductile iron pipe for less than and more than 20 years of installation were 118.1 and 114.2, respectively. In this study, it was also found that small value of C is used in the design of water pipe system. Therefore, excessively bigger size of pipe can be determined in the design of water pipe system. From the results of present study, optimum value of C can be used to avoid the oversized design of water pipe system.

• Nuclear Engineering and Technology
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• 제44권6호
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• pp.697-708
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• 2012

The majority of instrumentation and control (I&C) systems in today's nuclear power plants (NPPs) are based on analog technology. Thus, most existing I&C systems now face obsolescence problems. Existing NPPs have difficulty in repairing and replacing devices and boards during maintenance because manufacturers no longer produce the analog devices and boards used in the implemented I&C systems. Therefore, existing NPPs are replacing the obsolete analog I&C systems with advanced digital systems. New NPPs are also adopting digital I&C systems because the economic efficiencies and usability of the systems are higher than the analog I&C systems. Digital I&C systems are based on two technologies: a microprocessor based system in which software programs manage the required functions and a programmable logic device (PLD) based system in which programmable logic devices, such as field programmable gate arrays, manage the required functions. PLD based systems provide higher levels of performance compared with microprocessor based systems because PLD systems can process the data in parallel while microprocessor based systems process the data sequentially. In this research, a bistable trip logic in a reactor protection system (RPS) was developed using very high speed integrated circuits hardware description language (VHDL), which is a hardware description language used in electronic design to describe the behavior of the digital system. Functional verifications were also performed in order to verify that the bistable trip logic was designed correctly and satisfied the required specifications. For the functional verification, a random testing technique was adopted to generate test inputs for the bistable trip logic.

• 한국재료학회지
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• 제28권2호
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• pp.75-81
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• 2018

An ultra-high temperature ceramic, tantalum carbide, has received much attention for its favorable characteristics: a superior melting point and chemical compatibility with carbon and other carbides. One drawback is the high temperature erosion of carbon/carbon (C/C) composites. To address this drawback, we deposited TaC on C/C with silicon carbide as an intermediate layer. Prior to the TaC deposition, the $TaCl_5-C_3H_6-H_2$ system was thermodynamically analyzed with FactSage 6.2 and compared with the $TaCl_5-CH_4-H_2$ system. The results confirmed that the $TaCl_5-C_3H_6-H_2$ system had a more realistic cost and deposition efficiency than $TaCl_5-CH_4-H_2$. A dense and uniform TaC layer was successfully deposited under conditions of Ta/C = 0.5, $1200^{\circ}C$ and 100 torr. This study verified that the thermodynamic analysis is appropriate as a guide and prerequisite for carbide deposition.

• 지능정보연구
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• 제16권2호
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• pp.55-72
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• 2010

최근, NCW에 적합한 C4I 체계의 전투력 상승효과 평가의 필요성이 제기되고 있다. 기존의연구는 체계 자체에 중점을 두었으며, 인적 요소를 중요한 요소로 고려하지 않았다. 따라서, C4I 체계의 전투력 상승효과 평가 시 기술 및 인적 요소를 고려하여 평가하는 것이 필요한 시점이라고 할 수 있다. 이에 본 연구에서는 E-TechMan(A Combat Effectiveness Evaluation Algorithm Considering Technical and Human Factors in C4I System)이라 불리는 전투력 상승효과 평가 알고리즘을 제안한다. E-TechMan 알고리즘은 합동화력체계(Joint Fire Operating System-Korea)에 적용되어 전투력 상승효과를 평가해보았다. 또한, 기존의 연구방법인 C2 이론 및 고전 역학에 의한 결과와 비교를 하였다. 본 연구는 인적요소에 의한 영향을 반영함으로써 기존의 연구보다 현실적인 전투력 상승효과 결과를 제시했다는데 가치가 있다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1987년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 16-17 Oct. 1987
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• pp.422-425
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• 1987

Auto-programming of sequencer was implemented by PLC-.mu.C system, to transform the PLC program in the relay ladder diagram.

• 전기학회논문지
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• 제65권6호
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• pp.923-933
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• 2016

This paper proposes a new method for evaluating Effective Load Carrying Capability(ELCC) and capacity credit(C.C.) of power system including Wind Turbine Generator(WTG) combined with Battery Energy Storage System(BESS). WTG can only generate electricity power when the fuel(wind) is available. Because of fluctuation of wind speed, WTG generates intermittent power. In view point of reliability of power system, intermittent power of WTG is similar with probabilistic characteristics based on power on-off due to mechanical availability of conventional generator. Therefore, high penetration of WTG will occur difficulties in power operation. The high penetration of numerous and large capacity WTG can make risk to power system adequacy, quality and stability. Therefore, the penetration of WTG is limited in the world. In recent, it is expected that BESS installed at wind farms may smooth the wind power fluctuation. This study develops a new method to assess how much is penetration of WTG able to extended when Wind Turbine Generator(WTG) is combined with Battery Energy Storage System(BESS). In this paper, the assessment equation of capacity credit of WTG combined with BESS is formulated newly. The simulation program, is called GNRL_ESS, is developed in this study. This paper demonstrates a various case studies of ELCC and capacity credit(C.C.) of power system containing WTG combined with BESS using model system as similar as Jeju island power system. The case studies demonstrate that not only reasonable BESS capacity for a WTG but also permissible penetration percent of WTG combined with BESS and reasonable WTG capacity for a BESS can be decided.

• Spatial Information Research
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• 제9권2호
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• pp.353-368
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• 2001

현재 중앙정부 및 지방자치단체들은 지리정보시스템을 본격적으로 도입함으로서, 방대한 양의 공간데이타베이스 및 시스템을 개발하고 있다. 그러나 이러한 데이터베이스는 중복관리로 인해 공간자료의 일관성이 결여되어 업무의 효율성과 신뢰성이 저하되고 있고, 각기 도입한 시스템의 특이성과 자료 형식의 차이로 인해 상호 공유가 어려운 실정이다. 한편, 건설교통부는 토지관련 각종 법률·속성·공간자료 등을 통합데이터베이스로 구축하고 관련업무를 전산화하는 토지관리정보체계구축 사업을 수행하고 있다. 타 정보화사업의 인프라를 제공하는 토지관리정보체계에서는 이러한 중복관리 및 자료공유 문제의 해결과 지자체의 다양한 전산환경 하에서 운영될 수 있는 개방형 시스템(Open System)의 개발이 우선적으로 해결되어야 할 과제이다. 토지관리정보체계에서 개방형 시스템으로 개발하고자 하는 목적은 많은 정보화사업의 추진에 따라 지자체들이 이미 보유한 다양한 시스템 및 H/W, S/W의 재사용성과 개발된 시스템의 확장성을 확보하고자 하는데 있다.

• 대한수학회지
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• 제36권1호
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• pp.97-107
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• 1999

Given a C-dynamical system (A, G, $\alpha$) with a locally compact group G, two kinds of C-algebras are made from it, called the full C-crossed product and the reduced C-crossed product. In this paper, we extend the theory of the classical C-crossed product to the C-dynamical system (A, G, $\alpha$) with a left-cancellative semigroup M with unit. We construct a new C-algebra A $\alpha$rM, the reduced crossed product of A by the semigroup M under the action $\alpha$ and investigate some properties of A $\alpha$rM.