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.

음주운전 교통사고자의 음주량 분포에 관한 연구

권오성(O-Sung Kwon),김재균(Jae-Kyun Kim),박세연(Se-Youn Park),김명덕(Myung-Duck Kim),김영운(Young-Woon Kim),김은호(Eun-Ho Kim) 한국법과학회 2005 한국법과학회 학술대회 Vol.2005 No.1

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.

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.

편타성 상해로 인한 후인두혈종 1례

권오성 ( O Sung Kwon ),이종빈 ( Jong Bin Lee ),김기식 ( Ki Sik Kim ),정동우 ( Dong Woo Jung ),박가현 ( Ga Hyun Park ) 대한외상학회 2005 大韓外傷學會誌 Vol.18 No.2

Whiplash injury commonly seen in automobile accident. This type of acceleration-deceleration injury may rarely lead to unfavorable outcomes as in the case of retropharyngeal hematoma. Because this lesion has the possibility of compressing the potential airway acutely or gradually, not only the rapid assessment and treatment but also closed observation are needed. We report a case of a 20-year-old man, who sustained a whiplash injury from contact with the headrest of his seat after his car was involved in a rollover. He had no symptom except posterior neck pain initially, but complained odynophagia and acute dyspnea after 10 hours of admission. The diagnostic work-up comprising lateral radiograph, CT imaging disclosed the rare constellation of a retropharyngeal hematoma with cervical spine fractures. Medical treatment and close observation were sufficient for the patient because he had no progressive dyspnea or major dysphagia.

대형 할인 매장 스포츠 용품 소비자의 소비 행동과 구매 결정 요인에 관한 연구

권오성(Kwon o-sung),김미향(Kim mee-hyang) 한국스포츠산업경영학회 2003 한국스포츠산업경영학회지 Vol.8 No.2

본 연구는 대형 할인 매장 스포츠 소비자의 인구통계학적 특성에 따른 구매 용품 종류 및 구매 특성을 파악하고 이에 따른 스포츠 용품 구매 결정 요인의 차이를 규명하여 스포츠 용품 산업 발달에 필요한 실증적 자료를 제공하는데 있다. 본 연구의 대상은 서울, 인천, 수원, 분당, 일산에 위치한 5개 지역의 C 대형 할인 매장 이용자를 모집단으로 설정하고, 임의 표집법을 이용하여 565명의 자료를 수집하였다. 본 연구에 사용된 조사 도구는 Mullin 등(2000)과 박영옥 등 (1998)의 스포츠 산업 분류에 근거하여 스포츠소비자 유형을 분류하고 소비 행동 특성을 조자하였고, 구매 결정 요인은 김수잔 등(2002), 이승철 등(2002)과 이종호ㆍ최종필(2001)의 연구에서 사용된 바 있는 설문지를 토대로 문항을 작성하여 사용하였다. 설문지는 자기평가 기입법으로 작성하였고, 자료 처리는 Windows용 SPSS 10.07 Version을 이용하여 신뢰도 분석, 요인 분석, 교차 분석, 일원변량 분석을 실시하였다. 이와 같은 자료 분석의 방법과 절차를 통하여 다음과 같은 결론을 얻었다. 첫째, 대형 할인 매장 스포츠 용품 소비자의 인구통계학적 특성에 따른 소비 행동에는 차이가 있었다. 스포츠 참여 형태에 띠라 살펴보면, 관람 참여자가 성별, 연령별, 직업별, 소득 수준별 분류에서 직접 참여자보다 많은 수를 나타냈다. 스포츠 용품의 구매 종류는 성별, 연령별, 학력 수준별, 직업별, 가계 소득별 분류에서 대형 할인 매장 소비자들은 신발을 가장 많이 구매하는 것으로 나타났다. 스포츠 용품 구매 시 고려 사항은 성별, 연령별, 학력 수준별, 직업별, 가계 소득별 분류에서 대형 할인 매장 소비자들은 제품의 질을 가장 우선적으로 고려하는 것으로 나타났다. 둘째, 대형 할인 매장 스포츠 용품 소비자의 소비 행동 특성에 따른 구매 결정 요인에는 차이가 있다. 스포츠 참여 형태에 따른 분류에서 구매 편의성 요인에서, 스포츠 용품 구매 종류에 따른 분류에서는 구매 편의성 요인과 상품의 전문성 요인에서, 구매 시 고려 사항에 따른 분류에서는 상표 의존성 요인, 구매 편의성 요인, 상품의 전문성 요인에서 통계적으로 유의미한 차이를 나타냈다. The purpose of this study was to offer empirical datum for sports products industry development by construing of consumers' behaviors characteristics of sports products and identifying the difference of purchase decision factors of sports products according to consumers' behaviors characteristics through the analysis of purchase decision factors of sports products according to consumers' behaviors characteristics. The entire population of pollee in this research was consumers of C super super-markets in Seoul. In-chon, Su-won, Bun-dang and Il-san. The datum of 565 persons were collected by convenience sampling method. For examination of this study, consumers' behaviors characteristics based on sports industry classification of Mullin(2000) and Park, Young Ok(1998) were examined for the factors of purchase decision, This study was adapted and utilized the survey used by Kim, Su San(2002), Lee, Seng Chul(2002) and Lee Jong Ho(2001). The survey was worked out using self-administration method. Using SPSS 10.07 version for windows as materials management, This study was executed reliability analysis, factor analysis, cross-tab analysis and one-way ANOVA. The conclusion is as following; First, there is difference in consumers' behaviors according to demographic characteristics of sports products consumers. According to sports participation conformation, there were more participators who sport directly than audience participators in the classification of sex, age, job and income. The consumers of big discount markets purchased shoes the most in the classification of sex, age, school. year, job and income. The consumers of big discount markets considered the quality of products the most in the classification of sex, age, school year, job and income. Resent corroborated data about how the ski manias' experience reveals on the flow and the grounded theory approach. To explain more exactly, the study adopted both of the quantitative and qualitative methods. Second, there is difference in purchase decision factors of sports products according to behaviors characteristics of sports products consumers. In the classification according to sports participation conformation, the factors of sports products purchase decision showed meaningful difference statistically in the factor of purchase convenience. In the classification according to sports products purchase kinds, it showed difference in the factor of purchase convenience and product specialty. In the classification according to purchase consideration, it showed difference in the factor of brand name dependency, purchase convenience and products specialty.