• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제55권6호
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• pp.323-327
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• 2006

In this paper a new wire-wire discharge system with a slit dielectric harrier has been proposed, and, its corona discharge and ozone generation characteristics have been investigated experimentally. When the slit mica barrier is installed between corona wires, instead of the grounded plate electrode, a significant increase in the generation of ozone, about 2.2 times higher than that of the conventional ones without the slit harrier, could be obtained. Photographs show that this type of discharge system with a slit barrier was found to produce a corona discharge twice, once from the upper and bottom corona wires, and. again from both sides of surfaces and slits of the slit barrier. As a result, the proposed discharge system has the potential to increase significantly ozone production and it may be useful as an effective means for removing pollutant gases.

• 전기학회논문지P
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• 제67권4호
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• pp.233-237
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• 2018

In this paper, we compared power generation characteristics of two MPPT algorithms, P & O and InC, applied to grid-connected solar inverters. The MPPT detects the voltage and current of the solar module string and transfers the power to the DC link. Since the grid is connected by the power conversion circuit, the grid connection control and the MPPT control influence each other. The power generation characteristics were analyzed by Psim simulation according to the MPPT cycle in the weak grid conditions.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 추계학술대회 논문집 학회본부 A
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• pp.119-121
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• 2000

The possibility of a remote on-line determination of the maximum load rates that are basically set at generation plants is investigated in automatic generation control (AGC) system. Energy management system (EMS) generates a test input to a remote power plant to get the samples of the generator output. Then from the samples it can be attempted to determine an approximate value of the load rate limit set by the operator. It is shown in computer simulation that in actual power plants the limit can be approximately determined from the input-output characteristics of the plants for a unit-step input.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1995년도 Proceedings of the Korea Automation Control Conference, 10th (KACC); Seoul, Korea; 23-25 Oct. 1995
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• pp.380-383
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• 1995

Since the generation and transmission of telecommand in satellite monitoring and control system depend on the decisions of operators, it is possible that operators with different levels of knowledge may generate different telecommands in the same situation. Because of this reason, automation technology of satellite operation is being researched and developed to minimize the decision error due to the operator's lack of experience. This paper suggests a method of automated satellite control, which generates telecommands automatically using the knowledge of satellite subsystem engineers or specialists for the ground system. This method provides safe satellite operation and expansion of satellite life time by automatic generation of the telecommands, so that the operator's interrupt is minimized which provides the efficient satellite control.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제8권6호
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• pp.756-764
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• 2002

SoC 설계의 검증 비용이 전체 설계 비용의 70%를 차지한다. 이런 검증을 위한 노력과 시간을 줄이기 위해서는 SOC 설계 검증 수준을 시그널 수준 또는 사이클 수준에서 트랜잭션 수준으로 높여야 할 필요성이 있으며, 또한 그렇게 하는 것이 바람직하다. 이 논문에서는 인터페이스 신호를 모니터하고, 트랜잭션의 수행을 로그 파일에 기록하고, 트랜잭션 오류를 보고하는 트랜잭션 모니터 모듈의 생성 방법에 대해 기술한다. 인터페이스 프로토콜에 대한 기술을 입력으로 모니터 모듈을 생성한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 A
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• pp.547-549
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• 2001

Recently, heating using oil and gas has been continuously replaced by that using midnight power in home, due to increase of oil price. Therefore, midnight power apparatus has been more and more spreading. However, cost of midnight power services is increasing because high fuel cost of generation facilities by existing power generation mix are charge of midnight power services. This paper analyzes trends about rapidly increasing midnight power in winter, and evaluate load pattern and supply cost of midnight power. Also, this study proposes rate direction of midnight power according to introduction of competitiveness system with B/C evaluation of midnight power cost.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.178-180
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• 2003

This paper proposes a real-time simulator that can simulate dynamic changes of a substation for intelligent SCADA system. The simulator consists of RTDS, voltage and current amplifier, IED, and RTU. The simulator is verified by system implementation and event simulation of a substation.

• 한국기계기술학회지
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• 제13권4호
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• pp.85-91
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• 2011

Experimental analysis has been carried out to investigate thermal characteristics of hydraulic system in special vehicles. Hydraulic system performance is largely influenced by oil temperature, and there are considerable performance decline and malfunctions in the system for high temperature conditions caused by heavy load and continuous operation. Transient oil temperature and pressure variation are analyzed and heat generation rates in the several main system parts are compared for various flow rates. With the start of system operation oil temperature gradually increases, and viscosity deceases by about 70% as temperature increases from $20^{\circ}C$ to $80^{\circ}C$. Operation pressure in the hydraulic system decreases with oil temperature, and its variation rate becomes less steep as oil temperature increases. Heat generation rate in hydraulic pump also depends on the oil temperature, and it reaches maximum near $50^{\circ}C$. These results in this study can be applied to optimal design of efficient hydraulic system in special vehicles.

• 한국식품영양학회지
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• 제10권1호
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• pp.110-116
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• 1997

여과제균한 배추즙에 김치에서 분리한 7주의 젖산균을 단독 접종하고 1$0^{\circ}C$, 2$0^{\circ}C$, 3$0^{\circ}C$ 및 4$0^{\circ}C$에서 배양하면서 각각의 증식곡선을 작성하고, 이를 이용하여 각 배양온도에서의 유도시간과 세대시간을 구하였다. 3$0^{\circ}C$에서 배양할 때의 유도시간은 Leu. mesenteroides subsp. dextranicum은 168분, Leu. mesenteroides subsp. mesenteroides는 204분, Leu. paramesenteroides는 612분, Lac. bavaricus는 258분, Lac. homohiochii는 228분, Lac. plantarum은 270분 그리고 Lac. brevis는 264분이었고, 세대시간은 Leu. mesenteroides subsp. dextranicum 및 Leu. mesenteroides subsp. mesenteroides는 36분, Lac. bavaricus는 33분, Lac. homohiochii는 39분, Lac. plantarum은 66분, Lac. brevis는 42분 그리고 Leu. paramesenteroides는 162분이었다. 배양온도를 3$0^{\circ}C$에서 1$0^{\circ}C$로 낮출 때 모든 균주들의 유도시간과 세대시간이 크게 연장되었는데, 이러한 연장은 Lac. plantarum에서 더욱 현저하게 나타났다. 1$0^{\circ}C$, 2$0^{\circ}C$ 및 3$0^{\circ}C$에서는 Leu. mesenteroides subsp. mesenteroides의 유도시간과 세대시간이 Lac. plantarum의 그것보다 더 짧았다. 그러나 4$0^{\circ}C$에서는 이러한 양상이 완전히 전도되었다. 전반적으로 보아 배양온도가 낮아질수록 Leu. mesenteroides subsp. mesenteroides의 증식에 상대적으로 더 유리하였고, 배양온도가 높아질수록 Lac. plantarum의 증식에 상대적으로 더 유리하였다.

• 한국CDE학회논문집
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• 제1권1호
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• pp.65-75
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• 1996

This paper describes an automatic finite element(FE) mesh generation for three-dimensional structures consisting of free-form surfaces. This mesh generation process consists of three subprocesses: (a) definition of geometric model, i.e. analysis model, (b) generation of nodes, and (c) generation of elements. One of commercial solid modelers is employed for three-dimensional solid and shell structures. Node is generated if its distance from existing node points is similar to the node spacing function at the point. The node spacing function is well controlled by the fuzzy knowledge processing. The Delaunay method is introduced as a basic tool for element generation. Automatic generation of FE meshes for three-dimensional solid and shell structures holds great benefits for analyses. Practical performances of the present system are demonstrated through several mesh generations for three-dimensional complex geometry.