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.

마약범죄 통제를 위한 예산정책 연구

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

교토의정서체제에서의 환경세정책이 무역경쟁력에 미치는 영향에 대한 연구

권오성 ( O Sung Kwon ) 한국환경정책평가연구원 2009 환경정책연구 Vol.8 No.2

환경세를 비롯한 경제적 유인수단이 직접규제 방식의 환경정책수단보다 비용 효율적이고 오염저감기술개발의 유인을 제공하는 장점이 있기 때문에 우리나라에서도 1990년대 들어서부터 환경세 도입 및 환경친화적 세제개편에 대한 논의가 활발하게 진행되고 있다. 그러나 환경세가 무역경쟁력에 미치는 부정적 영향에 대한 우려가 현실적으로 환경친화적 세제개편을 단행하기 어려운 장애요인으로 작용하고 있다. 따라서 환경세의 부정적인 파급효과를 최소화하기 위하여 환경세의 도입은 철저하고 신중한 사전 준비를 통하여 이루어져야 하는데, 본고에서는 이에 대한 기초연구로서 환경과 무역을 연계한 국제적 논의의 추세와 국내외 선행연구를 개관하고, 환경세가 무역에 미치는 영향에 대한 이론분석결과를 제시하였다. 환경세가 무역에 미치는 영향에 있어서는 다른 나라보다 높은 환경세를 부과하는 경우, 오염유발산업보다 친환경적인 산업이 무역에 있어서 가격경쟁력이 있다는 결과를 도출하였다. 이는 환경세를 도입하는 경우 친환경적인 산업에 경쟁력 인센티브를 제공하여 중장기적으로 오염저감기술을 개발하는 긍정적인 효과를 기대할 수 있으며, 정부의 입장에서는 환경친화적인 산업 등을 육성, 지원하는 것이 환경개선과 동시에 무역부문에서의 국제경쟁력을 제고시키는 정책방향임을 시사한다. Environmental problems, such as the depletion of natural resources, global warming, and the destruction of ecological systems, are among the most serious problems facing the planet. Since the early 1990`s, many OECD countries have undertaken green tax reforms by introducing new environmental taxes to protect the environment. Environmental taxes have been used as an instrument of environmental policy more than direct regulation because economic instruments have a comparative advantage over direct regulation in terms of cost effectiveness and pollution abatement incentives. However, one important reason why green tax reforms have not progressed is due to fears regarding the negative effect of environmental taxes on international competitiveness in the industry and trade sectors. The main purpose of this paper is to analyze the effects of environmental taxes on industry and trade by using a theoretical model to compare the effects of environmental taxes on pollution-intensive and energy-saving industries.

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.

복음의 상황화 신학 관점으로 본 북한이탈주민의 회심에 관한 연구

권오성 ( Kwon O Sung ),하충엽 ( Ha Chung Yoube ) 한국복음주의선교신학회 2021 복음과 선교 Vol.53 No.-

본 논문에서는 복음의 상황화를 통해 북한이탈주민이 어떻게 회심이 일어나며 회심 이후에 어떻게 살아가고 있는지에 대하여 남한 출신 목회자와 북한 출신 목회자에게 신앙의 훈련받은 북한이탈주민을 비교하여 사례연구 방법으로 분석하였다. 이를 통해서 통일 이후에 북한에 복음을 전할 때 복음의 상황화를 통해 효과적으로 복음을 전할 수 있을 것이라는 전략을 제시하였다. 본 연구는 북한이탈주민에게 나타나는 복음의 상황화 신학을 통해 회심이 일어나며 심층 면담을 통하여 비교 사례연구로 이루어졌다. 연구참여자 A와 연구참여자 B를 서로 비교한 사례연구 분석을 토대로 복음의 상황화를 통한 회심을 경험한 북한이탈주민들을 위하여 한국 교회는 실제적인 전략들을 준비하여야 한다. 첫째, 상황 화 신학을 만들어야 한다. 둘째, 그들의 문화를 이해하며 복음제시 교재를 만들어야 한다. 셋째, 남과 북의 사람들이 함께할 수 있는 가칭 One Korea Dream 연구소를 만들어야 한다. 넷째, 남과 북의 사람들이 함께 통일을 준비하는 제자훈련 과정을 만들어야 한다. 다섯째, 북한 이탈주민이 북한 체제의 실상을 알 수 있는 콘텐츠와 남한을 알 수 있는 콘텐츠를 만들어서 각종 방송 매체에 올려 놓고 이를 알려야 한다. This paper analyzes how North Korean defectors are converted through the contextualization of the Gospel and how they live after conversion through a method of case study, comparing a South Korean pastor with a North Korean defector who has been trained in faith by a North Korean pastor. Through this, a strategy was suggested that when preaching the Gospel to North Korea after unification, the Gospel could be effectively communicated through the contextualization of the Gospel. This study was conducted as a comparative case study through in-depth interviews and conversion occurred through the theology of the contextualization of the Gospel found in North Korean defectors. Based on the case study analysis comparing study participant A and study participant B with each other, Korean churches should prepare practical strategies for North Korean defectors who experienced conversion through the contextualization of the Gospel. First, an indigenous theology should be created. Second, their culture should be respected and gospel teaching materials need to be developed. Third, it is necessary to establish an organization tentatively titled “One Korea Dream Research Institute” where North and South Koreans can interact. Fourth, it is necessary to make disciplinary training courses in which people from the South and the North prepare for unification together. Fifth, it is necessary to create contents that allow North Korean defectors to know the reality of the North Korean regime and contents that make them know South Korea, posting and reporting them on various broadcasting media.

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.