• 한국전기전자재료학회논문지
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• 제20권11호
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• pp.959-964
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• 2007

To investigate the influence of partial discharge(PD) distribution characteristics due to various defects on the power cable joints interface, we used the K-means clustering method. As the result of PD number(n) distribution analyzing on $\Phi-n$ graph, the phase angle($\Phi$) of cluster centroid shifted to $0^{\circ}\;and\;180^{\circ}$ increasing with applying voltage. It was confirmed that the PD quantify(q) and euclidean distance of centroid were increased with applying voltage from the centroid distribution analyzing of $\Phi-q$ plane. The dispersion degree was increased with calculated standard deviation of the $\Phi-q$ cluster centroid. The PD number and mean value on $\Phi-q$ graph were some different by electric field concentration with defect types.

• 한국국방경영분석학회지
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• 제33권1호
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• pp.19-29
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• 2007

본 연구는 최적의 정비주기 산정을 위해 공군의 항공기 정비정보체계(AMMIS, Aircraft Maintenance Management Information System) 및 상태검사의 데이터 분석을 통하여 항공기 부품 신뢰도 분석평가체계를 개발하기 위한 개념설정 및 운영방안에 대한 내용이다. 항공기부품의 고장자료를 선별하여 추출한 후 신뢰도 소프트웨어를 활용해 정비주기를 개선하고 상태검사시 측정한 고장 추세를 통계 소프트웨어로 분석하여 검사 주기를 재설정하는 방법을 통해 항공기 부품 신뢰도 분석평가체계의 운영 모델을 제시한다.

• 한국수학교육학회지시리즈A:수학교육
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• 제46권4호
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• pp.357-369
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• 2007

Teachers and students' knowledge of zero was investigated through data collected from 16 preservice secondary mathematics teachers and 20 gifted secondary school students. Results showed that these teachers and students had an inadequate knowledge about zero. They exhibited a reluctance to accept zero as an attribute for classification, confusion as to whether or not zero is a number, and stable patterns of computational error. Although leachers and researchers have long recognized the value of analyzing student errors for diagnosis and remediation, students have not been encouraged to take advantage of errors as learning opportunities in mathematics instruction. The article suggests using errors as springboards for inquiry in action, discusses its potential contributions to mathematics instruction by analyzing students and preservice teachers errors related to zero.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1997년도 추계학술대회논문집; 한국과학기술회관; 6 Nov. 1997
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• pp.210-215
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• 1997

Safety diagnosis on the driving system of electric train is performed using the vibration and noise signals of running railway train. Safety diagnosis is tried on the viewpoints of the appreciation of superannuation and the fault diagnosis of motor, reduction gear and boggie. The appreciation of superannuation is checked by the rms vibration levels of driving parts and the fault diagnosis is done by analyzing the frequencies of the vibration signals. The methods of measuring and analyzing the signals are decided on the basis of field 1-measured signals. The results shows that the vibration levels of each parts increase as the train goes older and each parts have their own frequency patterns of the vibration. As the results, the vibration and noise can be utilized successfully for the safety diagnosis of the driving part of electric train.

• 한국축산시설환경학회지
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• 제18권sup호
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• pp.7-12
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• 2012

To prevent the inappropriate treatment of livestock manure and induce the correct circulation of them into farmland, systematic monitoring and management by the treatment and circulation stage of livestock manure are required. The purpose of this study was to apply ubiquitous information communictation technology (u-ICT) to a livestock waste management system for better treatment by utilizing ubiquitous computing technology in the livestock sector. Elements and levels of applicable u-ICT technology for efficient livestock manure management were derived by analyzing previous researches. In addition, a conceptual diagram of an integrated management system was suggested by analyzing the existing liquid fertilization process.

• 한국문헌정보학회지
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• 제32권3호
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• pp.97-112
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• 1998

본 연구는 정보제공을 주된 기능으로 하는 우리나라 전문도서관의 참고봉산 현장에서 일어나는 연구자의 다양한 정보질의에 응답하는 참고사서의 정보탐색과정을 관찰과 질문지법을 통하여 분석한 것이다. 질의에 대한 응답의 정확성이 저조한 이유가 어디에 있으며, 연구자의 정보만족도에 영향을 미치는 저해요인이 무엇인지를 구명함으로서 봉사내용의 질과 응답의 정확성을 높일 수 있는 개선방안을 모색하자는 데에 목적을 두고 있다.

• 패션비즈니스
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• 제13권4호
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• pp.112-123
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• 2009

The -purpose of this study is to examines the Cheoyongmu's costume of the paintings of Banquets during the Choseon dynasty focusing on the Comparison of the Cheoyongmu's costume in Akhakgwebeom. The method of the study is the literature analysis closely the occurrence, feature, and function of the Cheoyongmu by analyzing the costume process of transition of the eras was analyzed into the function and feature. The research was done by comparing and analyzing the difference of the costume in Akhakgwebeom. In term of difference, of the Cheoyongmu's costume of the paintings of Banquets and Akhakgwebeom had the shape and colour. In headgear, Samo(: 紗帽) or Bokdu was worn and the flower decoration on the Samo and Ui(:衣)was different pattern. The Gilgyong(:吉慶) was not worn. Hye(: 鞋) and Hwa(:靴) was worn and the colour of Hwa was different.

• 대한안전경영과학회지
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• 제18권4호
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• pp.131-137
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• 2016

In unlimited competition era changed rapidly, productivity improvement and raw cost reduction by working improvement are very important for the survival of middle and small-sized companies. At this moment, middle and small-sized companies are cleary important in domestic industry. Therefore, this researcher applied TPS(Toyota production system) 7 wastes by experiment planning method for wastes of lots of working processes at the manufacturing site of automobile assembly manufacturing company, D company, analyzed current system of D company applied so as to verify if value creation works and factors were minimized during the production and drew results by analyzing experimental planning for analyzing waste elimination.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1998년도 추계학술대회 논문집
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• pp.345-352
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• 1998

The dynamic analysis of a train system has tended to analyze one vehicle or subsystem of that rather than to analyze entire vehicles. But, the speeding and lightening of a train requires more accurate analysis. Thus, the analysis of entire vehicles is required but it spends much time. Therefore, it is needed to find out the new analytic method which is more accurate and efficient. This paper suggests a new method for analyzing a multi-vehicle system more efficiently, using‘mechanical impedance’At first, get the impedance of vehicles which influence the dynamics of the object car, through analyzing the dynamics of a vehicle. ‘Equivalent system’, a simple mechanical system, of which the impedance is similar to that ,is proposed. Then, the equivalent system was applied to a vehicle and it showed that the equivalent system works like a real vehicle system. Finally, we tried non-linear analysis of a vehicle to which the equivalent system is applied.

• 한국컴퓨터정보학회논문지
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• 제20권8호
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• pp.53-59
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• 2015

Noise from the surrounding environment, building structures and machine equipment have significant effects on daily life. Many solutions to this problem have been suggested by analyzing causes of noise generated from particular locations in general buildings or machine equipment and detecting defects of buildings or equipment. Therefore, this paper suggests a visualization technique of sounds by using the microphone array to measure sound sources from machines and perform the visual machine condition monitoring (VMCM). By analyzing sound signals and presenting effective sound visualization methods, it can be applied to identify machine's conditions and correct errors through real-time monitoring and visualization of noise generated from the plant machine equipment.