• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.1137-1138
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• 2008

The purpose of this study is to implement a landscape lighting system that displays full color video by precisely controlling the R, G, B (Red, Green, Blue) LEDs which have a resolution of 256 each. The system implemented in this study consists of a PC, MASTER, SLAVEs and MODULEs. The PC sets the various landscape lighting displays, and the image files can be sent to the MASTER through a virtual serial port connected to the USB (Universal Serial Bus). The MASTER sends a sync signal to the SLAVE. The SLAVE uses the signal received from the MASTER and the landscape lighting display pattern.

• Journal of Electrical Engineering and Technology
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• v.11 no.3
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• pp.575-584
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• 2016

Considering the randomness and uncertainty of wind power, a reliability model of WTGs is established based on the combination of the Weibull distribution and the Markov chain. To analyze the failure mode quickly, we use the switch-section partitioning method. After defining the first-level load zone node, we can obtain the supply power sets of the first-level load zone nodes with each WTG. Based on the supply sets, we propose the dynamic division strategy of island operation. By adopting the fault analysis method with the attributes defined in the switch-section, we evaluate the reliability of the distribution network with WTGs using a sequential Monte Carlo simulation method. Finally, using the IEEE RBTS Bus6 test system, we demonstrate the efficacy of the proposed model and method by comparing different schemes to access the WTGs.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.673-676
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• 2002

Real time communication is very important in factory automation system using FieldBus. In this paper, we Propose the method to drive dual motors with one controller using CAN In traditional induction motor control technique, two independent Inverters are used to drive dual motors independently. In this case, two controllers are needed. Our proposed dual motors control scheme which use only one microprocessor has many advantages in the view of economic and performance compared to conventional technique.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.255-258
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• 2009

최근 EDA 툴의 기술적인 향상과 반도체 공정의 발달로 IC 설계자들은 RISC 프로세서, DSP 프로세서, 메모리 등 많은 IP가 하나로 집적되는 SoC구조가 가능해졌다. 하지만 기존에 사용되는 대부분의 SoC는 공유버스 구조를 가지고 있어, 병목현상이 발생하는 문제점을 가진다. 이러한 문제점은 SoC 내부의 IP들이 많을수록 SoC 플랫폼의 전체 성능이 저하되어, CPU 자체의 속도보다는 효율적인 통신에 의해 성능이 좌우된다. 본 논문에서는 공유버스의 단점인 병목현상을 줄이고 성능을 향상시키기 위하여 크로스바 스위치버스 구조를 제안한다. OpenRISC 프로세서, VGA/LCD 제어기, AC97 제어기, 디버그 인터페이스, 메모리 인터페이스로 구성되는 SoC 플랫폼의 WISHBONE 온칩 공유버스 구조와 크로스바 스위치 버스 구조의 성능을 비교한 결과, 기존의 공유버스보다 26.58%의 성능이 향상됨을 확인하였다.

• Proceedings of the KIEE Conference
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• 2001.07a
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• pp.181-183
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• 2001

This paper presents a robust power system state estimator using linear programming(LP). LP state estimators minimize the weighted sum of the absolute values of the measurement residuals. In this paper, WLS(weighted least square) and WLAV(weighted least absolute value) state estimators are run with same measurement sets including bad data in order to compare the robustness to bad data and convergence characteristics of the two methods. Simulations with three test cases are performed and the results are presented, using IEEE 14 bus system.

• Proceedings of the KIEE Conference
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• 2001.07a
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• pp.106-108
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• 2001

This paper presents the comparison of three methods which determines the voltage control area for the secondary voltage control in power system. Each secondary control area is sufficiently uncouped from its neighbours for the controls within a area to be slightly influenced by the actions carried out in the other areas. Results obtained using a modifed 48bus test system are presented illustrating the applicability of the approach.

• Proceedings of the KIEE Conference
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• 1997.07c
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• pp.1149-1152
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• 1997

This paper describes a novel approach for allocating transmission costs among users of transmission services. In the suggested approach, the cost share of each participant is proportional to amount of its line flow. To develop individual user's impact, the line utilization factors of each participant are derived by power flow equations of all nodes (i.e., load-flow equations). To deal With the slack bus problem inherent in the conventional load-flow analysis more practically, a additional power supply/demand balance equation is incorporated. Although the developed allocation rule is basically similar to the existing MW-mile method in the aspect of embedded cost allocation, it does not require to get load flow solutions of each wheeling transaction when multiple transmission transactions are considered.

• Proceedings of the KIEE Conference
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• 1998.07c
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• pp.899-901
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• 1998

Continuation power flow is a tool that can trace the path of the solution from the base stable solution. However, the base stable solution cannot be calculated when the initial system load is too large to operate at a stable operating point. This case is called as unsolvable case. This paper presents implementation of the optimal load shedding algorithm on continuation power flow. It performs steady-state analysis of power systems at unsolvable case that can occur in contingency analysis. Numerical simulation on 20-bus test system demonstrates that the continuation power flow applying the optimal load shedding algorithm is robust at solvable and unsolvable cases.

• Journal of the Semiconductor & Display Technology
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• v.19 no.2
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• pp.82-87
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• 2020

In this paper, we introduce the novel idea to improve the B/W usage efficiency of on-chip networks used for TAM to test multiple DRAMs. In order to avoid the local bottleneck of test packets caused by an ATE, we make test patterns using microcode-based instructions within ATE and adopt a test bus to transmit test responses from DRAM DFT (Design for Testability) called Test Generator (TG) to ATE. The proposed test platform will contribute to increasing the test economics of memory IC industry.

• Journal of Electrical Engineering and Technology
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• v.9 no.4
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• pp.1188-1195
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• 2014

This paper presents an analytical technique for reliability evaluation of electrical distribution network (EDN) containing distributed generation (DG). Based on hierarchical levels of circuit breaker controlling zones and feeder sections, a directed-relation-graph (DRG) for an END is formed to describe the hierarchical structure of the EDN. The reliability indices of EDN and load points can be evaluated directly using the formed DRG, and the reliability evaluation of an EDN containing DGs can also be done without re-forming the DRG. The proposed technique incorporates multi-state models of photovoltaic and diesel generations, as well as weather factors. The IEEE-RBTS Bus 6 EDN is used to validate the proposed technique; and a practical campus EDN containing DG was also analyzed using the proposed technique.