광탄성실험 Hybrid 법에 의한 일정한 변형율을 받는 O-Ring 의 응력해석

권오성(O-Sung Kwon),황재석(Jai-Sug Hawong),남정환(Jeong-Hwan Nam),한송령(Song-Ling Han),박성한(Sung-Han Park) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11

In this research, stresses of O-ring with uniform deformation ratio in upper and lower direction are analyzed by photoelastic experimental hybrid method. The O-ring is made from rubber and is used to sealing of the high pressure vessel. The compressive deformation ratios of O-ring are 10% and 20%. Stress components (σ<SUB>xx</SUB>, σ<SUB>yy</SUB>, τ<SUB>xy</SUB>) of O-ring uniform ratios obtained from the photoelastic experimental hybrid method are almost identical to those from Hertz’s theory. Therefore, stress freezing method and photoelastic experimental hybrid method are effective applied to the stress analysis of O-ring made from rubber and with uniform ratios. The loading device developed in this research is used to produce the uniform deformation ratio of O-ring and as loading device of stress freezing. Stress distributions results from the upper contact surface of O-ring are almost identical to those from the lower contact surface of O-ring without regard to squeeze deformation ratio.

로봇용 연료전지 이차전지 하이브리드 시스템 연구

권오성,이상철,이상우,이동하,Kwon, O-Sung,Lee, Sang-Cheol,Lee, Sang-Woo,Lee, Dong-Ha 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.suppl3

Proton exchange membrane fuel cell (PEMFC) is the most promising energy source for the robot applications because it has unique advantages such as high energy density, no power drop during operating, and easy to make compact size. However, PEMFC has intrinsic disadvantages which are delay to start up and difficulty to correspond drastic load changes. These disadvantages can be compensated by hybrid operating with a Li-poly battery. This study is focus to build and understand the hybrid system for the robot system. In this study, we build the PEMFC hybrid system using EOS-320 PEMFC stack, Li-poly battery and G-Philos FDX1-250BU dc-dc converter. The hybrid system is accurately monitored by CAN and RS485. The system was studied under two conditions such as non-loaded and loaded operating conditions. The results show that the system has delay to start up without hybrid operating and it can be compensated with the hybrid operating.

Hong-Ou-Mandel 간섭계를 이용한 Bell 상태

권오성,김헌오,박구동,김태수,Kwon, O-Sung,Kim, Heon-Oh,Park, Gu-Dong,Kim, Tae-Soo 한국광학회 2007 한국광학회지 Vol.18 No.1

제 1형의 매개하향변환에서 발생하는 광자쌍과 Hong-Ou-Mandel 간섭계를 이용하여 편광-얽힘 상태의 광자쌍을 선택적으로 발생시키고, 반파장판과 4분파장판을 조합하여 4개의 Bell 상태 $|{\Psi}^{\pm}>,|{\Phi}^{\pm}>$를 구현하였다. 동시계수 측정에 의한 각 상태의 평균 선명도는 77%이다. Bell states have been investigated in a Hong-Ou-Mandel interferometer using photon pairs from a type-1 SPDC. The four kinds of the Bell states, $|{\Psi}^+>,|{\Psi}^->,|{\Phi}^+>,|{\Phi}^->$ are created by placing 2 HWPs, 2 QWPs at outputs of the interferometer. They show an average visibility of 77% in the coincidence measurement.

엔진윤활유 중 Ethylene Glycol의 용제추출후 bistrimethylsilyltrifluoroacetamide(BSTFA)를 이용한 GC/MS 분석에 관한 연구

이준배(Joon-Bae Lee),권오성(O-Seong Kwon),유재훈(Jae-Hoon You),손성건(Shungkun Shon),성태명(Tae-Myung Sung),팽기정(Ki-Jung Paeng) 한국트라이볼로지학회 2012 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.28 No.6

For proper functioning, general machines usually need lubricant oil as a cooling, cleaning, and sealing agent at points of mechanical contact. The quality of lubricant oil can deteriorate during operation owing to various causes such as high temperature, combustion products and extraneous impurities. In this study, a heavy load stopped during operation, and the oil was analyzed to check whether any impurities were added. Extraction using acetonitrile followed by reaction with BSTFA(bistrimethylsilyl trifluoroacetamide) showed that, trimethylsilylated ethylene glycol was present in the lubricant oil. To quantify the ethylene glycol in the oil, deuterium-substituted ethylene glycol, which acted as an internal standard, was added to the sample and then extracted with the solvent. Next, the extract was reacted with the derivatizing agent(BSTFA) and then analyzed with GC/MS. The detection limit of this method was found to be 0.5 ㎍/g and the recovery of oil containing 20,000 ㎍/g of ethylene glycol was measured to be 94.8%. A damaged O-ring and eroded cylinder liner were found during the overhaul, which implied the leakage of coolant containing ethylene glycol into the lubricating system. The erosion of the cylinder liner was assumed to be due to cavitation of the coolant in the cooling system.

병목 구간에서의 전도특성 수집을 위한 압력센서 모듈의 개발

권오성(Kwon, O-Sung),김응식(Kim, Eung-Sik),김수영(Kim, Soo-Young) 한국화재소방학회 2007 한국화재소방학회 학술대회 논문집 Vol.2007 No.추계

사례연구를 통한 탈북민의 회심 과정에 관한 연구

권오성 ( Kwon O Sung ),임재환 ( Lim Jae Hwan ),윤대노 ( Yoon Dae No ),유진범 ( You Jin Beom ) 한국복음주의선교신학회 2023 복음과 선교 Vol.61 No.-

본 연구는 탈북민의 회심의 과정과 회심에 영향을 미치는 결정적인 요인을 사례 연구를 통하여 분석하였다. 기독교 신앙을 가진 20명의 탈북민 연구참여자와의 면접조사를 통하여 탈북민의 회심이 단회적인 사건이 아닌 여러 요인이 복합적으로 결합하여 나타나는 과정임을 확인할 수 있었다. 먼저 탈북 과정 가운데 대다수의 탈북민이 경험하는 생사의 위기는 회심을 위한 중요한 출발점이 된다. 특별히 탈북민이 탈북하는 도중에 북송과 같이 결정적인 위기를 모면하는 초월적 경험을 하거나 초월적 존재를 경험한 경우에 이들은 회심을 할 수 있는 매우 핵심적인 토대를 확보한다는 점을 확인하였다. 면접 조사 결과 이들의 초월적 경험은 기독교 신앙을 가진 신앙인 즉 목회자 혹은 선교사 등의 존재를 통하여 해석되는 과정을 거치면서 진정한 회심으로 이어지는 것을 발견할 수 있었다. 이들은 신앙인과의 만남과 성경에 대한 배움의 과정 속에서 자신이 경험했던 초월적 경험을 하나님의 개입과 인도하심으로 이해하게 된다. 또한 본 연구는 탈북민을 만나는 목회자와 선교사가 자신을 위해 권위를 내세우지 않고 온유한 마음과 겸손과 사랑으로 그들에게 다가갔을 때에 비로소 대다수 탈북민이 가지는 걸림돌이 제거된다는 점을 확인하였다. 이러한 사례 분석을 바탕으로 탈북한 이후 남한 정착 과정에 있는 사람들의 회심을 도울 수 있는 탈북민 회심을 위한 효과적인 전도전략을 제시하였다. This study analyzed the decisive factors affecting the conversion process and conversion of North Korean defectors through case studies. An interview survey of 20 North Korean defectors with Christian faith confirmed that the conversion of North Korean defectors was not a single event but a combination of factors. First, the crisis of life and death experienced by many North Korean defectors during the process of defection is an important starting point for conversion. When North Korean defectors experienced or escaped a critical crisis, such as returning to North Korea while escaping from North Korea, they secured a very important foundation for conversion. An interview survey found that their transcendental experience led to true conversion through the process of being interpreted through the existence of believers of Christian faith, such as pastors or missionaries. They understand the transcendent experience they experienced in the process of meeting with believers and learning about the Bible through God's intervention and guidance. The study also confirmed that the skandalon (a stumbling block) of many North Korean defectors was removed only when pastors and missionaries who meet North Korean defectors did not put forward their authority for themselves and approached them with a gentle heart, humility and love. Based on this case analysis, an effective evangelism strategy for the conversion of North Koreans was presented that can help those who are in the process of settling in South Korea after defecting.

경상북도 시군 패널데이터를 이용한 도시민들의 귀농 유발요인 분석

권오성 ( O-sung Kwon ),여준호 ( Jun-ho Yeo ) 한국농업정책학회 2018 농업경영정책연구 Vol.45 No.3

This study analyzed determinants of return to farming to use panel data analysis. To do this, we collected the data related to the return to farming over the period 2007 to 2014. First, we conducted F-test and LM-test for choosing a model that is considered a characteristics of the panels. As a result, tests show that panel data analysis is more suitable than the other. Second, we conducted Unit Root Test to confirm stability of time series data because panel data include part of time series. The test shows the panel data has stability of time series. Third, we used Hausman-test to decide a suitable model is either Fixed Effects Model or Random Effects Model. The Hausman-test indicated that Fixed Effects Model is compatible. The Fixed Effects Model shows that if the subsidy for return to farming will increase ten millions won about policy variable, the number of households also increases one household. And a number of bed hospitals in every thousand people also positive effect(+) to the return to farming. And If the area has a number of house, it would be increase the number of household for returning to farming. The model has a positive coefficient about Gross regional domestic product of agriculture. This means that the people who move to area for farming thought conditions for agriculture. And urban people also consider the number of people who works in primary industry because they can get a job related to their work. And the number of pollution discharge facilities doesn’t influenced to return to farming. But the factor indicates a negative coefficient.

칼라 등색선무늬용 광탄성실험 하이브릿법 개발에 관한연구

권오성(O-Sung Kwon),황재석(Jai-Sug Hawong),남정환(Jeong-Hwan Nam),한송령(Song-Ling Han),권건(Gun Kwon),류의(Yi Liu) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5

Isochromatics obtained from photoelastic experiment shows the stress distributions of full field of a structure under a load. Therefore stress distributions of the structure can be read at a glace through isochromatics. Many experimental data are obtained from isochromatics. And then, the various photoelastic experimental hybrid methods have been developed. Until now, monochromatic light has been used for photoelastic experimental hybrid method. Therefore the photoelastic experimental hybrid method used until now is called the photoelastic experimental hybrid method for black and white isochromatics. When stresses are analyed by photoelastic experimental hybrid method, many experimental data are needed. Therefore some fringe orders of isochromatics are needed for the photoelastic experimental hybrid method for white and black isochromatics. Therefore in this paper, the photoelastic experimental hybrid method for color isochromatics is developed. In this case, two fringe orders are enough for the experimental data of photoelastic experimental hybrid method for color isochromatics. Applying the method to stress concentration problems, its validity is confirmed. In the precision, the photoelastic experimental hybrid method for color isochromatics is better than the photoelastic experimental hybrid method for white and black isochromatics when fringe orders of isochromatics are few. When fringe orders are few, the photoelastic experimental hybrid method for color isochromatics can be used to analyze stress through few fringe orders of isochromatics.

파라메트릭 알고리즘을 통한 지하유휴부지 공간형성에 관한 연구 - 서울특별시 동대문구 신설동역 유령승강장을 중심으로 -

권오성(Kwon, O-Sung),손태진(Sohn, Tae-Jin) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.1

Due to the recent Fourth Industrial Revolution and so on, the modern society has become complicated and mixed, changing to fluidity. But despite the rapid pace of modern society changing in the course of complexity and mixing, the present universal architectural paradigm cannot respond flexibly to these rapid changes. Therefore, the purpose of this study was to form an efficient underground space using the Terrain Generator with GIS, to form a space corresponding to the fluid program, and to propose an efficient response to physical and human variables around the target. Through this process, we expect that the formation of a space that responds flexibly to the rapidly changing modern society and the creation of an efficient space for underground space will be able to come up with appropriate countermeasures for existing abandoned underground facilities.

마약범죄 통제를 위한 예산정책 연구

권오성(Kwon O-Sung),서성아(Seo Sung-Ah),김윤수(Kim Youn-Soo) 한국형사법무정책연구원 2005 형사정책연구원 연구총서 Vol.- No.-