• Annual Conference of KIPS
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• 2000.10b
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• pp.1573-1576
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• 2000

망의 규모가 커지고 사용자가 많아짐에 따라 점차 망 관리의 필요성이 인식되면서 많은 망 관리 시스템이 개발되고 있다. 하지만 현재의 시스템 제작은 새로운 기술들이 빠른 속도로 나오기 때문에 개발기간이 점점 단축되어야 하는 부담을 안고 있다. 이에 본 연구에서는 SNMP(Simple Network Management Protocol)를 이용하여 웹 기반의 망 관리 시스템을 개발하는 개발자에게 좀더 쉽고 편리하게 시스템을 개발할 수 있도록 망 관리 시스템 개발에 필요한 중요 핵심 기술을 Javabeans를 사용하여 컴포넌트화 하는데 있다. 이를 위해서는 먼저 망 관리 시스템 개발에 필요한 기능 중에 컴포넌트화 가능한 항목들을 규정하고 이들에 대한 컴포넌트를 설계하여 실제 NMS(Network Management System)에 적용하였을 때의 이점을 논하기로 한다.

• Proceedings of the KIEE Conference
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• 1998.07c
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• pp.1046-1049
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• 1998

This paper deals with the new fault detection technique for transmission line using Neuro-fuzzy Scheme. Neuro-fuzzy Scheme is ANFIS(Adaptive-network Fuzzy Inference System) based on fusion of fuzzy logic and neural networks. The proposed scheme has five layers. Each layer is the component of fuzzy Inference system and performs different action. Using learning method of neural network, fuzzy premise and consequent parameters is tuned properly.

• Proceedings of the KIEE Conference
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• 2005.10a
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• pp.180-183
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• 2005

A programmable dynamometer is the proposed system improved the problem of the torque measuring delay with torque transducer, and the load torque is estimated by the minimal order state observer based on the torque component of the vector control induction moter. Therefore, the torque controller is not affected by a load torque disturbance. To verify a superiority of the proposed control algorithm, the analysis for a root locus of a conventional control method and the proposed one, and simulation and experiment is performed. Therefore we hope to be extended in industrial application.

• Proceedings of the KSR Conference
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• 2003.05a
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• pp.427-432
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• 2003

The control method of programmable dynamometer for overall test of machine is to load the reference torque which is computed from torque transducer into motor under test. But the torque information detected from torque transducer have a lot of noise when the load torque of moter is a small quantity or changing. Thus, torque transducer must have a low pass filter to detect a definite torque information. But The torque delay generated by filter with torque transducer occur a torque trouble for meter torque of programmable dynamometer. The proposed system improved the problem of the torque measuring delay with torque transducer, and the load torque is estimated by the minimal order state observer based on the torque component of the vector control induction meter. Therefore, the torque controller is not affected by a load torque disturbance.

• Journal of Industrial Technology
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• v.18
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• pp.355-362
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• 1998

The deadlock detector is a DBMS sub-component that examines periodically whether system is in a deadlock state based on lock waiting information of transactions. The deadlock detector and transactions execute concurrently in a DBMS and read and/or write the lock waiting information simultaneously. Since the lock waiting information is a shared one, we need an efficient method guaranteeing its physical consistency by using mutual exclusion. In this paper, we propose a new method that effectively guarantees physical consistency of lock waiting information. Two primary goals of our method is to minimize the processing overhead and to maximize system concurrency.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.1112-1114
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• 2017

The liquid rocket engine determines the routing of the component placement and layout by adapted the cycle method, the hardware configuration, the gimbal type on the functional implementation, and so on. In this paper, the conceptual routing of major pneumatic lines such as helium (He) supply pneumatic line for driving, many purge pneumatic line and main ignition line based on the main components installed in the liquid rocket engine was performed.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.2B no.4
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• pp.201-206
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• 2002

The paper presents the component parts and their models of the Switched Reluctance motor drive system with the angle position-current chopping control and with the fixed angle pulse width modulation control. The calculation of the parameters and the simulated models based on the MATLAB SIMULINK software package are introduced by a four-phase 816 structure prototype with the four-phase asymmetric bridge power converter. The simulation of the prototype in the course of starting is made by the simulated models at the different control strategies and the different given rotor speed.

• Annual Conference of KIPS
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• 2001.10a
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• pp.497-500
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• 2001

EJB(Enterprise JavaBeans)는 컴포넌트 트랜잭션 모니터를 위한 표준 서버측 컴포넌트 모델로서 트랜잭션을 보장하고 확장성, 이식성, 안정성 등이 우수하며 분산 트랜잭션을 지원하므로 뱅킹시스템과 같은 복잡한 시스템을 구현하는데 적합한 모델이다. 새로운 어플리케이션을 개발할 경우에도 기존의 컴포넌트를 재사용함으로써 보다 쉽게 개발할 수 있으며 이런 장점은 사회의 변화와 시장환경에 민감하게 대처할 수 있는 신속한 상품개발과 배포 기능, 용이한 유지보수성을 요구하는 뱅킹시스템의 요건을 충족시킨다고 볼 수 있다. 본 논문에서는 EJB 뱅킹컴포넌트의 유용성을 예상해보고 트랜잭션처리에 있어서 시스템공통 처리부분과 업무단위별 처리부분으로 구분하므로써 구현의 복잡도와 구현상의 오류를 줄일 수 있는 보다 효과적인 아키텍쳐를 제안하며 그 처리흐름과 각 부분별 기능들을 정의해 본다.

• International Journal of Automotive Technology
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• v.6 no.5
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• pp.537-544
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• 2005

This paper presents the efficiency measurement and energy analysis for a parallel HEY. Using the HEV test rig, the efficiency of each powertrain component is measured for a given driving cycle including the regenerative braking system. Accompanied by the efficiency measurements, a detailed energy analysis is performed. Based on the efficiency measurement and energy analysis, a HEV performance simulator is developed. Using the simulator, the HEV performance is evaluated for a mild hybrid system. It is expected that the HEV simulator developed can be used to obtain further optimization potentials.

• Proceedings of the KIEE Conference
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• 1994.11a
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• pp.33-35
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• 1994

This Paper Presents a practical approach to evaluate the reliability indices of electric distribution systems. The use of reliability evaluation is placed with the framework of distribution system planning. In this paper, the reliability model is based on an analytical method, connecting component failure to load point outage each section. five case studies are reported in the paper. These are to study the effect of varying failure rates and repair times on distribution feeders. The results of a study on sample system are presented in this paper.