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특성 임피던스 정합을 위한 TEM CELL의 최적 구조 설계와 전계 분포 해석에 관한 연구
정성영,이중근 대한전자공학회 1996 전자공학회논문지-A Vol.33 No.7
In this paper, the analysis o fthe electric field distribution for TEM cell which is matched iwth 50 is performed, and the relations of variables for characteristic impedance are derived. Quasi-static approximations are used to calculate the fiedl strength of the internal field of TEM cell. The results of the improved method for analysis of the electric field is compared with that of R.J. Spigel. and the improved method for characteristic impedance and the results of numerical analysis are shown.
정성영 韓國聖書大學校 2012 一粒論叢 Vol.17 No.-
Korean church has experienced a revival movement with a steady state sustainment but now is faced with a decline in church growth and impact to the society. The objective of this paper is to present appropriate preaching style to address this crisis at hand. Preaching or pulpit ministry reflects on the sociological and economic state of a given time. Therefore, it is critical to address and assess most appropriate preaching or pulpit ministry of today to address this decline in church movement today. Four major areas of preaching or pulpit ministry are presented in this paper followed by recommendations: 1. Identify those elements of sermon based on incorrect interpretation of the text and recommend sermon based on sound interpretation with a proper exposition of the text, 2. Present sermon development based on proper proposition, 3. Assess significance of preacher's dependence on the Holy Spirit in preaching, and 4. Address importance of the preacher's character in preaching.
수평판 설치에 따른 방파제형 파력 발전 시스템의 영향에 대한 연구
정성영,오진석 한국항해항만학회 2014 한국항해항만학회지 Vol.38 No.1
최근 전 세계적으로 고유가 상황이 지속됨에 따라 신재생에너지원에 대한 연구가 활발히 진행되고 있다. 그중 해양에너지는 그 양이 매우 많고 밀도가 높기 때문에 활용성이 높다. 특히 우리나라의 경우 삼면이 바다로 둘러싸여있기 때문에 해양에너지원이 매우 풍부하다. 본 논문은 해양에너지를 전력으로 변환하는 시스템중 하나인 방파제형 파력발전 시스템에 수평판 설치를 통한 발전 효율 향상에 관하여 서술하였다. 기존의 방파제형 파력발전 상부에 수평판을 설치함으로써 시스템의 전력변환효율을 향상시킬 수 있으나 아직까지 국내에서는 이에 대한 연구가 미흡하다. 본 논문에서는 조파수조 실험을 통하여 수평판이 방파제형 파력발전 시스템에 미치는 영향에 대해 분석하고, 본 시스템에 적합한 수평판 설치에 대해 제안한다. Due to the oil price is increasing continuously, active researches on sources of renewable energy has been invigorated. Above all, ocean energy has high-usability because of ocean current has high density and large quantity compared to the wind energy. In this paper, efficiency enhancement of the wave power generation was described through horizontal plate installation at the break water wave power generation system that converts the ocean energy into electricity .The power-conversion efficiency can be improved by horizontal plate installation at existing system, but there has been insufficient studies domestically. The purpose of this paper is to analyze about the effects of the horizontal plate installation on the breakwater wave power generation system by wave basin experiment and to propose a position of horizontal plate installation.
정성영,박범,곽윤상,박준홍 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.6
Electronic devices must be quiet during manipulation for operations. In addition, the sounds need to show distinct impression to satisfy the user’s auditory experience and indicate the completion of an operation. The sounds occur in a short time from frictional contact and the consequent structural vibration when a user operates a device. In this study, the impact sound during printer cassette insertion is analyzed. The rail vibration during closure movement generates continuous sound. This movement ends with the impact sound from contact between the cassette and printer body. The sounds occur as clicking sounds with double impacts separated by a short interval. This clicking sound is important serving as an indicator of completed insertion. The user’s perception of this complex sound is investigated. A physical index to quantify the generated sound is proposed to assist comparisons between printers. Prony’s method was used to characterize the sound features including duration, double impact interval, magnitudes, and decay rates. From the extracted features, artificial clicking sounds were simulated for sound quality evaluations. Auditory experiments were performed to investigate the user’s preference for the separated rail and impact noises. The just noticeable difference was defined to classify the important factors influencing the perception characteristics.