재제조를 위한 노후 선반 스핀들의 열적 안정화 설계에 관한 연구

유성원(Seong-Won Yoo),이정학(Jeong-Hak Lee),이춘만(Choon-Man Lee),김동현(Dong-Hyeon Kim) 한국생산제조학회 2022 한국생산제조학회지 Vol.31 No.1

Decrepit lathe can be functionally upgraded to like-new or with enhanced performance through remanufacturing. Remanufacturing can reduce resource consumption and waste generation. Machining accuracy is often affected by thermal errors, and spindles are one of the main sources of thermal errors in machine tools. In this study, an optimal design was developed to thermally stabilize the spindle of a machine tool to be remanufactured. The spindle bearing position, diameter of the shaft, and the length of the shaft were selected as design variables, and the object functions of the optimal design were the thermal deformation and the temperature of the spindle. Experiments were performed using computer aided design. As a result, the temperature and thermal deformation of the optimized model were decreased compared with the initial model. The optimized model can be applied to improve the accuracy of a spindle on a decrepit lathe after remanufacturing.

2010년 이후 중소형 아파트 단위세대 평면 공간구성 분석

유성은(Sung Eun Yoo) 한국퍼실리티매니지먼트학회 2017 한국퍼실리티매니지먼트학회지 Vol.12 No.2

Apartment unit plan is evolving by the development of commercialization strategy and designing technology and the demand of consumer. In the past, middle- to large-sized apartment was favored, but with the changes of family members and institutional changes, the preference for national housing size apartment(less than 85㎡) began to increase. In this study, we investigate the characteristics of the plan composition through the analysis of the plan of unit households of the residential housing products that have been sold since 2010 and compare it with the previous research data to understand the changes of the housing products and provide them as basic data for future product development. The result of this study shows that various plan types are being tried to diversify the product composition. As the number of bay expansions is increasing, the width of the front is increasing as it is generalized to 4 bays. However, it can be seen that the pattern of the front seal configuration maintains a constant shape. A variety of space configurations reflecting changes in the demands and preferences of the state are attempted, but it is necessary to study space configurations that can cope more actively.

언택트 시대, 국내 보조기기센터 교육운영 현황과 향후 접근방향 제안

유성문(S. M. Yoo),김동아(D. A. Kim),이성아(S. A. Lee) 한국재활복지공학회 2021 한국재활복지공학회 학술대회논문집 Vol.2021 No.11

In this study, in order to investigate the current status of assistive technology center education in the Corona situation and to suggest future directions, we investigated and analyzed the educational status of domestic assistive technology centers and related institutions of assistive technology centers, and then suggested future approaches. As the non-face-to-face era has arrived due to various problems, face-to-face service-based assistive technology centers require various preparations to provide optimal services. Among them, education should be prepared to reflect the level of demand between instructors and students as much as possible and to maximize the educational effect of face-to-face environments even in non-face-to-face environments.

와류발생기를 사용한 핀-관 열교환기의 열전달 촉진

유성연(Seong-Yeon Yoo),이상윤(Sang-Yoon Lee),박동성(Dong-Seong Park) 대한설비공학회 1997 대한설비공학회 강연회 및 기타간행물 Vol.- No.-

급속탄산화 시험기에 의한 플라이애시 콘크리트의 탄산화 특성 연구

유성원(Yoo Sung Won),방기성(Bang Gi Sung),정상화(Jung Sang-Hwa),장승필(Chang Sung Pil) 대한토목학회 2007 대한토목학회논문집 A Vol.27 No.4A

콘크리트의 탄산화 과정은 철근의 부식을 유발하는 주요 요인이지만 탄산화 과정이 시간을 두고 느리게 진행되기 때문에 이에 대한 실험적인 연구 자료는 부족한 실정이다. 이에 따라 본 연구에서는 최근 개발된 진공용기를 활용 급속촉진탄산화 실험 장치를 이용하여 기존의 실험장치보다 실험기간을 단축시킨 포틀랜드시멘트 및 플라이애시 콘크리트에 대한 촉진탄산화 실험을 수행하였다. 실험결과 물-시멘트비가 40%인 경우와 비교하여 물-시멘트비가 45%에서 60%까지 증가할 때 탄산화깊이도 103%에서 138%까지 증가하였다. 예측모델에 의한 탄산화깊이 예측값은 실험에 의한 결과보다 크게 나타났으며, 물-시멘트비가 증가할수록 차이가 커지는 결과를 나타냈다. 또한, 기존의 연구결과와 유사하게 플라이애시 혼입량이 증가할수록 탄산화깊이가 급격히 증가하는 결과를 나타내었다. 급속촉진탄산화 실험체계를 통해서 기존 촉진탄산화 실험과 비교하여 짧은 기간에 유용한 실험결과를 얻을 수 있었으며, 본 연구에서 수행한 실험자료와 향후 지속적인 데이터의 축적을 통해 국내 콘크리트 구조물에서의 탄산화 과정을 밝히는데 많은 기여를 할 수 있을 것으로 기대된다. Carbonation is one of the most important factors of the concrete deterioration resulting in the steel corrosion in concrete. Nevertheless, the experimental data for the study of the concrete carbonation have not been sufficiently accumulated because the carbonation of concrete is a long-term phenomenon. In this study, the newly-developed rapid carbonation test by the usage of the vacuum equipment has been used to observe the carbonation behaviors of concretes made of portland cement and of fly-ash cement. Experimental results showed that concretes with 0.45 and 0.6 w/c had the carbonation depth of 103% and 138%, respectively, comparing to that of 0.4 w/c. The carbonation depths calculated by an analytical model were deeper than the experimental results and the deviations increased with the increase of the water to cement ratio. It was also observed that the carbonation depth rapidly increased with the increase of fly-ash replacement. Consequently, the rapid carbonation test provided experimental results in a shorter time than the conventional carbonation tests, and it is expected that these experimental data and the further study by the new rapid carbonation test will contribute to the future studies of concrete carbonation.

냉방부하 예측 프로그램의 적용사례에 관한 연구

유성연(Seong-Yeon Yoo),이제묘(Je-Myo Lee),김영진(Young-Jin Kim),한승호(Seung-Ho Han),한규현(Kyou-Hyun Han) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11

The objective of this study is to apply the estimation program of cooling load, which is made for electric power supply and demand control, on general ice thermal storage system. When applying the program, the amount of cooling thermal storage is 0 ㎾ and operating mode is not considerable. The program estimate cooling load using the input values that are only the lowest and highest temperature for the next day. Then the estimated data help an operator to be easily handling the cooling system by calculation data. The estimated values were compared with the real values and investigated. In this way, office working conditions were more pleasant and running cost of ice thermal storage system were reduced.

서비스 시설 건물성능평가(post occupancy evaluation: POE) 교육 사례

유성은(Yoo, Sungeun),이소연(Lee, Soyeon) 한국실내디자인학회 2019 한국실내디자인학회 학술대회논문집 Vol.21 No.2

「출입국관리법」 상 행정조사절차의 개선방안에 관한 연구

유성의(Yoo Seong Hee),장교식(Jang Kyo Sik) 한국토지공법학회 2016 土地公法硏究 Vol.74 No.-

우리나라에서의 불법체류 외국인은 매년 꾸준한 증가 추세를 보이고 있으며 지난 2014년에는 무려 20만 명에 달하는 것으로 집계되었다. 이와 같은 불법체류 외국인의 증가는 출업국관리행정을 집행하여 실효성을 확보하도록 규정하고 있는 「출입국관리법」의 역할 또한 증대하고 있음을 나타낸다. 즉, 「출입국관리법」은 출입국관리공무원에게 불법체류 외국인을 단속·조사할 수 있는 권한뿐만 아니라 강제퇴거, 출국명령 등의 행정처분까지 행할 수 있는 권한이 주어지고 있어 외국인의 인권이 침해될 우려가 있다. 현행 「출입국관리법」은 수범자인 출입국관리공무원과 불법체류 외국인 등 간의 간격을 좁히지 못하고 있는 것이 현실이다. 「출입국관리법」상의 인권보호적인 규정이 불충분하여 발생하는 인권침해는 물론이고 출입국관리공무원이 고권적이며 권력적인 권한을 가지고 출입국관리행정 업무를 집행함에 따라 엄격하게 지켜져야 할 행정조사 절차가 외국인에게는 무시되거나 준수되지 않아 발생하는 외국인의 인권침해도 문제이다. 예컨대, 출입국관리공무원이 단속과정에서 ‘증표휴대·제시의 의무’를 준수하지 않거나 단속업무의 시간이 야간이나 새벽에 이루어지는 점, 그리고 불법체류 외국인에게는 불심검문에 강요당하지 아니할 권리에 대한 규정도 없다. 이러한 행정절차의 미준수와 규정마비는 출입국관리공무원의 직무행위의 정당성은 물론이고 「출입국관리법」의 실효성에까지 영향을 미치기 때문에 개선될 필요가 있다. 즉, 「출입국관리법」 상 단속규정의 신설은 물론, 동법 제82조의 규정을 강화하여 출입국 단속절차에서 출입국관리공무원의 의무를 준수하도록 하여야 한다. 단속행위에 있어서도 야간 및 새벽시간대의 단속을 제한하여 불법체류 외국인의 인권 침해를 예방하여야 하며, 불심검문과 관련하여 불법체류 외국인에게도 신체구속 및 질문강제 금지규정을 도입하여 최소한의 인권을 보호할 수 있도록 해야 할 것이다. The number of illegal aliens in South Korea shows a steady increase, and was tallied as many as two hundred thousand in 2014. Such an increase in the number of illegal aliens represents a role of 'Immigration Control Law,' which is regulated to ensure the effectiveness by executing the immigration control administration. In other words, this is because 'Immigration Control Law' gives permission to immigration officials not only to crack down on illegal aliens or investigate but also they can take an administrative measure such as compulsory expulsion, ordering deportation, and etc. However, compared with scope of extensive power, it is reality that 'Immigration Control Law' cannot narrow the gap between immigration officials who should follow the law and illegal aliens. For example, immigration officials do not comply with 'obligation to carry or present their badges' in the crackdown, they clamp down at nighttime or at dawn, and they are inadequate for the regulation, which is about the right not to be forced to police questioning to illegal aliens. Because all such deviations or incompletions of administrative procedure affect not only immigration officials' legitimacy of activity of duty, but also effectiveness of 'Immigration Control Law,' they need to be improved. In other words, regulation of article 82 of the 'Immigration Control Law' should be strengthened, so comply with obligation of immigration officials in immigration crackdown procedure, and prevent human rights abuse of illegal aliens by restriction on crackdown at night and dawn. Moreover, with reference to the police questioning and introduction of regulation, which is about restriction of body and prohibition of compulsory questions to the illegal aliens, you need to protect a minimum human rights.

배기열 회수용 종이 열교환기의 성능예측에 관한 연구

유성연(Seong-Yeon Yoo),김진혁(Jin-Hyuck Kim) 대한설비공학회 2005 대한설비공학회 학술발표대회논문집 Vol.2005 No.11

나프탈렌승화법을 이용한 3차원 열전달 측정

유성연(S. Y. Yoo) 대한설비공학회 1991 대한설비공학회 강연회 및 기타간행물 Vol.- No.-