• Proceedings of the KIEE Conference
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• 1998.07c
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• pp.1114-1117
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• 1998

Recent applications of neural networks to power system fault diagnosis have provided positive results and have shown advantages in process speed over conventional approaches. This paper describes the application of neural network to fault detection and classification in distribution lines using the fundamental component, 2-5th harmonics index, even and odd harmonics index, and zero phase current. The Electromagnetic Transients Program (EMTP) is used to obtain fault patterns for the training and testing of neural networks. The proposed fault detection and classification method in distribution lines is obtained by analysing the difference among normal, HIF, ground fault, short circuit fault condition.

• 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.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.9 no.6
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• pp.9-18
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• 2000

This study includes noise automatic inspection system for washing machine auto-transmission one of modern home necessary. We effort to find and certificate sound noise source by sound power and sound intensity, and apply to frequency analysis in vibration related sound noise. still more we have been studying to data acquisition and programming for MS VisualBasic version 5.0. System component is below. 1) Pentium PC or data acquisition. 2) DSO for noise acquisition. 3)S/W for comparison and decision. 4) I/F Board for data communication. Wave form data through the DSO are converting to ASCII code data. The ASCII code through binary converting S/W. Finally we will making noise monitoring system and automatic inspection system.

• 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.

• Annual Conference of KIPS
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• 2004.11a
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• pp.353-356
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• 2004

일반적으로 컴포넌트 기반의 SW는 바이너리 파일로 구성되어 있다. 즉, 블랙박스 형식이다. 따라서 컴포넌트 테스팅 시에 코드기반의 화이트박스 테스트 기법을 적용하기가 어렵다. 그래서 컴포넌트 테스팅 시에는 소스코드기반이 아닌 명세기반의 테스트를 수행해야 한다. 그러나 컴포넌트 제공자는 고객에게 바이너리 파일과 일부분의 명세만을 제공한다 즉, 컴포넌트 제공자는 컴포넌트 안에서의 테스트 범주와 테스트 메트릭에 대한 정보를 제공하지 않는다. 이에 따라 고객은 컴포넌트의 테스트 적절성, 테스트 커버리지, 그리고 테스트 품질을 이해하는 것이 어렵다. 그리고 효과적인 테스팅을 위해서는 적절한 테스팅 모델이 있어야 한다. 따라서 본 논문에서는 컴포넌트 테스팅을 효율적으로 하기 위하여 컴포넌트 테스팅 모델을 제안하였고, 테스팅을 위한 명세 요소를 식별하였다.

• Annual Conference of KIPS
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• 2001.10a
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• pp.371-374
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• 2001

본 논문에서는 EJB 컴포넌트 성능 측정 도구 설계에 대하여 설명한다. 이전 연구에서는 EJB 컴포넌트를 역컴파일하는 방법을 사용하였으나, 역컴파일 방지 기술이 사용된 컴포넌트에 대해서는 성능 측정 할 수 없다는 문제를 가졌다. 또 성능 측정을 하기 위한 테스트 프로그램을 작성해야 하는 2차적인 능력이 필요하였다. 이러한 문제를 해결하기 위해 본 논문에서는 black box 성능 측정 기법을 사용하고, 테스트 프로그램을 자동 생성하여 성능 측정을 자동화하는 방법을 제시한다.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.1108-1110
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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 meter 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 moter. Therefore, the torque controller is not affected by a load torque disturbance.

• Journal of Community Nutrition
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• v.8 no.1
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• pp.16-23
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• 2006

This paper describes a methodology for conducting Community Nutrition research with rather than on people in a community to generate grounded theory. This collaborative grounded theory methodology incorporates local knowledge and wisdom and builds community leadership capacity through engaging community-based professionals and para-professionals in the research process. In addition to building capacity for participation and leadership in research, education and action, this approach can increase the validity and value of the research and facilitate its application in community led programs. The methodology has five components: background, study design, data gathering, data analysis and interpretation, and application of findings in community programming. Three stages of the data analysis component focus sequentially on each interview independently, comparing across interviews, and systematically testing theory developed in the first two.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.28 no.7
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• pp.69-74
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• 2014

Recently, IEC published new standards about the requirements and tests for lightning protection system(LPS) components. If components are used for LPS, they should comply with the IEC standards. This paper, we collected six specimens for the metallic connection components using in domestic, and it tested for withstand lightning current which according to the IEC 62561-1. As a result, only one specimen meet this performance requirement. The specimen is the metallic connection component with four bolts fixed. Therefor, when designing of LPS in domestic, the metallic connection components shall be taken into account for the selection of the withstand lightning current. In addition, we need to develop for LPS components product and the national standards.

• Proceedings of the KIEE Conference
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• 2004.11b
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• pp.217-219
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• 2004

The second harmonic component could be decreased by magnetizing inrush when there have been changes to the material of the iron core or its design methodology. The higher the capacitance of the high voltage status and underground distribution, the more the differential current includes the second harmonic during the occurrence of an internal fault. Therefore, the conventional second harmonic-restrained RDR needs modification. This paper describes an advanced numerical algorithm that utilizes terminal voltage, differential current harmonics, harmonic ratio, and flux-differential current slope. Based on the results of testing with WatATP99 simulation data, the proposed algorithm was proven to be faster and more reliable.