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 ) 한국농식품정책학회 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.

석회석 광산에서 Bulk EMX(HiMEX)폭약의 적용성에 관한 연구

권오성 ( O Sung Kwon ),정민수 ( Min Soo Jung ),하태수 ( Tae Su Ha ),도규문 ( Kyu Mun Do ),윤영훈 ( Young Hun Yoon ),김영덕 ( Young Dug Kim ) 대한화약발파공학회 2004 화약발파 Vol.22 No.1

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.

복음의 상황화 신학 관점으로 본 북한이탈주민의 회심에 관한 연구

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

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.