• 한국정보과학회논문지:시스템및이론
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• 제33권9호
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• pp.699-708
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• 2006

버스 분할 기법은 통신이 많은 모듈들을 가까이 배치하고 필요한 버스 단편만 사용함으로 버스 에너지 소비를 줄인다. 그러나 MPSoC와 같은 다중 프로세서 플랫폼에서는 캐시 일관성을 유지하기 위하여 모든 프로세서에서 버스 트랜잭션을 알아야 하므로, 기존의 버스 분할 기법을 적용할 수 없다. 본 논문에서는 공유 메모리 기반의 MPSoC 플랫폼에서 버스 에너지를 절감시키기 위한 버스 분할 기법을 제안한다. 제안된 버스 분할 기법은 비 공유 메모리와 공유 메모리의 버스를 분할함으로써, 캐시 일관성을 유지하며 비 공유 메모리를 참조할 때 소비하는 버스 에너지를 최소화시킨다. 또한, 태스크별 버스 트랜잭션 횟수를 기반하여 태스크를 할당함으로써, 공유 메모리를 참조할 때 소비하는 버스 에너지를 절감시키는 캐시 일관성을 고려한 태스크 할당 기법을 제안한다. 시뮬레이션을 통한 실험에서 제안된 버스 분할 기법은 비 공유 메모리 참조시의 버스 에너지를 최대 83%까지 절감시키며, 태스크 할당 알고리즘은 공유 메모리 참조시의 버스 에너지를 최대 36%까지 절감시키는 효과가 있음을 보여준다. 그럼으로 다중 프로세서 시스템에서도 버스 분할 기법을 적용하여 버스 에너지 절감 효과를 볼 수 있으며, 캐시 일관성을 고려한 태스크 할당 기법을 통해 추가적으로 버스 에너지를 절감할 수 있음을 보여준다.

• Journal of Electrical Engineering and Technology
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• 제11권1호
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• pp.76-85
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• 2016

This paper presents a method of decision on where bus splitting is needed to reduce fault current level of power systems and to satisfy the fault current constraints. The method employs a modified fault current constrained optimal power flow (FCC-OPF) with X variables for the candidate locations of splitting and for decision making on whether to split or not, it adopts soft-discretization by augmenting inversed U-shaped penalty terms. Also, this paper discusses the procedure on the adequate selection of bus splitting locations based on the results of the modified FCC-OPF, to reduce the total number of the actions taken.

• 한국정보과학회논문지:시스템및이론
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• 제32권6호
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• pp.324-332
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• 2005

일반적으로 버스에서 소모되는 에너지는 전체 시스템에서 큰 비중을 차지한다. 버스 분할 방법은 시스템의 소모 에너지를 줄이고 각 버스 세그먼트들의 기생 부하(parasitic load)를 감소시킴으로서 지연시간을 줄이는데 사용될 수 있다. 버스를 분할함에 있어서 버스에 의해 상호 연결된 처리소자들 사이의 데이타 교환 확률 분포에 따라 가장 적은 에너지를 소모하는 버스 분할 방법은 달라질 수 있다. 본 연구에서는 수평적인 버스 분할 구조의 확장된 개념으로 트리구조 기반의 버스 분할 방법에 대해 연구하고, 이를 바탕으로 여러 가지 버스 분할 방법 중에서 주어진 시스템의 처리소자 간 데이타 교환 확률의 분포에 따라 가장 적합한 구조를 선택하는 문제에 대해 논하였다. 실험 결과는 제안된 방법들이 버스에서 소모되는 에너지를 최대 83$\%$까지 감소시킬 수 있음을 보여준다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.651-654
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• 2005

In this paper, we designed ECC(Elliptic Curve Cryptographic) Processor with Bus-splitting mothod for embedded SoC. ECC SIP is designed by VHDL RTL modeling, and implemented reusably through the procedure of logic synthesis, simulation and FPGA verification. To communicate with ARM9 core and SIP, we designed SIP bus functional model according to AMBA AHB specification. The design of ECC Processor for platform-based SoC is implemented using the design kit which is composed of many devices such as ARM9 RISC core, memory, UART, interrupt controller, FPGA and so on. We performed software design on the ARM9 core for SIP and peripherals control, memory address mapping and so on.

• 한국초전도ㆍ저온공학회논문지
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• 제7권2호
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• pp.16-20
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• 2005

As power systems grow more complex and power demands increase, the fault current tends to gradually increase. In the near future, the fault current will exceed a circuit breaker rating for some substations, which is an especially important issue in the Seoul metropolitan area because of its highly meshed configuration. Currently, the Korean power system is regulated by changing the 154kV system configuration from a loop connection to a radial system, by splitting the bus where load balance can be achieved, and by upgrading the circuit breaker rating. A development project applying 154kV Superconducting Fault Current Limiter (SFCL) to 154kV transmission systems is proceeding with implementation slated for after 2010. In this paper, SFCL is applied to reduce the fault current in power systems according to two different application schemes and their technical impacts are evaluated. The results indicate that both application schemes can regulate the fault current under the rating of circuit breaker, however, applying SFCL to the bus-tie location is much more appropriate from an economic view point.

• KIEE International Transactions on Power Engineering
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• 제4A권4호
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• pp.221-226
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• 2004

As power systems grow more complex and power demands increase, the fault current tends to gradually increase. In the near future, the fault current will exceed a circuit breaker rating for some substations, which is an especially important issue in the Seoul metropolitan area because of its highly meshed configuration. Currently, the Korean power system is regulated by changing the 154kV system configuration from a loop connection to a radial system, by splitting the bus where load balance can be achieved, and by upgrading the circuit breaker rating. A development project applying a 154kV Superconducting Fault Current Limiter (SFCL) to 154kV transmission systems is proceeding with implementation slated for after 2010. In this paper, SFCL is applied to reduce the fault current in power systems according to two different application schemes and their technical and economic impacts are evaluated. The results indicate that both application schemes can regulate the fault current under the rating of circuit breaker, however, applying SFCL to the bus-tie location is much more appropriate from an economic view point.

• 한국초전도ㆍ저온공학회논문지
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• 제5권1호
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• pp.103-106
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• 2003

The short circuit current problem is one of the operational problems that need to be solved by power system engineers in Korea. It is an important issue in the Seoul metropolitan area especially because of highly meshed configuration. Currently, it is regulated by changing 154 kV system configuration from loop connection to radial system, by splitting of the bus where load balance can be achieved, and by upgrading circuit breaker rating. A development project for 154 kV/2 KA SFCL application to 154 kV transmission system after 2010 is proceeding. In this paper, a feasibility study of superconducting fault current limiter (SFCL) is carried out in Seoul metropolitan area to find out the effects of its application and feasibility. This study shows that it can reduce fault current considerably, and as it can minimize the upgrading of circuit breaker rating, the economic potential of SFCL is evaluated positively.

• 전기학회논문지P
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• 제64권4호
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• pp.297-302
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• 2015

Replacing a manual switch installed in a feeder for a distribution system with an automatic one increases the reliability of the electric power system. This is because the automatic switch can shorten the duration of a fault the customer experiences by splitting the faulty section faster than the manual one does. However, improving the reliability of the distribution system may increase investment costs. Here, the investment costs include automatic switch cost, replacement work cost and labor cost. For this reason, importance should be attached to the proper balance between the increase of the investment costs and the improvement of the reliability of the distribution system. This article analyzed reliability index and economics when manual switches installed in a feeder (RBTS Bus2 model) was replaced by automatic ones. In addition, it attempted to draw the optimum rate of automation of manual switches by automatic ones using the GRG optimization method, considering the current economic requirements.

• KIEE International Transactions on Power Engineering
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• 제3A권1호
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• pp.1-6
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• 2003

As power systems grow more complex and power demands increase, the fault current tends to gradually increase. In the near future, the fault current will exceed a circuit breaker rating for some substations, which is an especially important issue in the Seoul metropolitan area because of its highly meshed configuration. Currently, the Korean power system is regulated by changing the 154 ㎸ system configuration from a loop connection to a radial system, by splitting the bus where load balance can be achieved, and by upgrading the circuit breaker rating. A development project applying 154 ㎸ Superconducting Fault Current Limiter(SFCL) to 154 ㎸ transmission systems is proceeding with implementation slated for after 2010. In this paper, the resistive and inductive SFCLs are applied to re-duce the fault current in Korean power system and their technical and economic impacts are evaluated. The results show that the application of SFCL can eliminate the need to upgrade the circuit breaker rat-ing and the economic potential of SFCL is evaluated positively.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 A
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• pp.421-423
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• 2004

As power system grows more complex and power demands increase, the fault current tends to gradually increase. In the near future, the fault current will exceed a circuit breaker rating for some substations, which is an especially important issue in the Seoul metropolitan area because of its highly meshed configuration. Currently, the Korean power system is regulated by changing the 154kV system configuration from a loop connection to a radial system, by splitting the bus where load balance can be achieved, and by upgrading the circuit breaker rating. A development project applying 154kV Superconducting Fault Current Limiter(SFCL) to 154kV transmission systems is proceeding with implementation slated for after 2010. In this paper, the expected price of SFCL in order to assure the economic feasibility is evaluated comparing with upgrading cost of ciui.1 breakers. The results show that the SFCL should be developed under seven times of price of circuit breaker to be competitive against upgrading circuit breakers.