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JunHyuk Kwon,Seong Choon Jeong 대한건축학회지회연합회 2014 대한건축학회연합논문집 Vol.16 No.6
Introducing the concept of construction safety in the design/planning phase can improve the efficiency and effectiveness of safety management on construction sites. In this sense, further improvements for safety can be made by designers’ involvement in the elimination or management of design-related hazards in addition to contractors’ own efforts, as known as Prevention through Design (PtD). However, this idea has not been well materialized in construction practices due in part to the lack of a PtD tool that allows designers to automatically check and evaluate designs in terms of worker safety. The paper addresses this issue by designing and testing an automated compliance checking framework that extracts information relevant to design-related hazards from regulatory documents and maps it to each of related design components using Natural Language Processing (NLP) and Building Information Modeling (BIM). The proposed framework has two key functions: 1) automatically extracting machine-readable regulation information relevant to design-related hazards using NLP techniques; and 2) automatically mapping such information to corresponding design components in a building information model, enabling the visualization of hazards. How all these components work to automatically display design-related hazards and relevant regulatory information is illustrated with a three-story building, focusing on fall protection. The proposed framework successfully extracted regulation information from textual documents with about 90% of precision and recall rates. It also correctly identified all the hazards in the case study model. The automated framework is expected to facilitate safety design review by improving designers and contractors’ proactive responses against design-related hazards
권준혁(Junhyuk Kwon),이명호(Myungho Lee),조형호(Hyungho Cho),홍형길(Hyunggil Hong),조용준(Yongjun Cho),윤해룡(Haeyong Yun),오장석(Jangseok Oh),박희창(Huichang Park),강민수(Minsu Gang) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.12
In this study, we developed an automatic module changer for agricultural implements for using in unmanned agricultural robots. An automatic module changer is attached by lowering from the top to bottom of the implements and fixing the four fastener bars attached to the implements in combination. The lift function was implemented using seesaw-type structures to keep the engagement point constant when the automatic module changer climbs and descends, and the switching function of the automatic module changer was implemented using the link device in the cam structure. We developed an algorithm to check the presence of attachment and opening/closing of the workpiece using limit switches and verified the performance through combination assessment and weight lift test to assess whether the combination was within the error range.
디젤 파일럿 압축착화 천연가스엔진의 성능 및 배출가스 특성
이준혁(Junhyuk Lee),표영덕(Youngdug Pyo),권오석(Ohseuk Kwon),이용균(Yonggyun Lee),나평철(Pyungchul Na),류정인(Jeongin Ryu),이영재(Youngjae Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Natural gas has superior characteristics that are low fuel efficiency, low CO₂, low pollution and stabilization. And it is possible to apply to existing diesel engine with some mechanical modification. Diesel pilot compression ignition CNG engine has advantage of power and efficiency as same as diesel engine without high cost of remodeling and it can use advantage of high compression ratio of diesel engine and has low Smoke and NOx. In the present study, an existing diesel engine was remodeled into single cylinder Diesel pilot CNG engine has two fuel suppling system, one is diesel pilot injection in cylinder using existing Electronic Unit Injector(EUI), the other is the way that injected CNG into a intake manifold using instituted supply apparatus. The test results showed that diesel pilot injection timing was decided 13°BTCD and diesel pilot injection fuel flow was decided 0.19 L/h. At that condition, Smoke and CO were reduced and NOx was slightly increased than using diesel fuel.
감정 처리 뇌파 연구에 사용하는 IAPS 의 물리적 특성 분석
최준혁(Junhyuk Choi),홍준희(Jun Hee Hong),권문영(Moonyoung Kwon),박수담(Soodam Park),박태진(Taejin Park),전성찬(Sung Chan Jun) 한국HCI학회 2013 한국HCI학회 학술대회 Vol.2013 No.1
정서 및 감정 처리 (emotional processing)에 대한 뇌파 (EEG) 연구는 여러 사진 자극들을 이용하여 지금까지 활발히 진행하고 있다. 그 중 사진 자극으로써 International Affective Picture System (IAPS)은 사람의 감정을 기초로 하는 실험에서 표준화된 감정 자극으로 쓰인다. 최근에는 감정의 뇌파 분석의 결과가 자극에 의해서만 아니라 사진의 물리적인 요소가 사람의 감정에 영향을 미친다는 연구에 의해, 이러한 물리적 특성을 될 수 있으면 통제하여 뇌파 분석을 하려는 추세이다. 본 연구에서는 IAPS 의 물리적 특성 (Color, Spatial frequency)을 분석하여 앞으로의 감정 처리 뇌파 연구에서 사진의 물리적인 요소들이 어떤 영향을 미칠지에 대한 선행 연구로서, 그것을 알기 위해 분류된 자극 사진들의 차이점들을 통계적으로 추정해 보았다. The EEG analysis for emotional processing have been studied using various stimuli pictures. Among variants pictures, the International Affective Picture System (IAPS) is widely used as standardized stimuli for experimental investigations of emotional processing. Recently, there is a trend to analyze considering both physical properties of IAPS and EEG analysis only, since the results come from the stimulus type as well as the physical factors of IAPS. From these points of view, we investigate the physical characteristics of IAPS and show statistical differences among categorized stimuli pictures.
초소형 가스터빈엔진 열전달 현상의 수치적 및 실험적 연구
서준혁(Junhyuk Seo),권길성(Kilsung Kwon),최주찬(Ju Chan Choi),백제현(Jehyun Baek) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.2
본 연구에서는 MEMS기술을 적용한 2W급 초소형 가스터빈엔진의 개발과 실제 연소 환경에서의 발전 가능성을 해석적, 실험적으로 입증하였다. 초소형 가스터빈엔진은 터보차저, 연소기, 발전기로 이루어져 있다. 터보차저는 각각 직경 10mm와 9mm의 MEMS 공정 압축기와 터빈으로 구성되어 있으며 발전코일 또한 MEMS공정으로 설계되었다. 제작된 압축기와 터빈은 정밀 기계 가공된 축과 공기 베어링으로 지지되고 회전하며, 회전축 끝단에 영구자석을 설치하여 발전을 하게 된다. 공기 베어링과 압축기를 통한 냉각 효과를 해석하여 연소기에서 발생한 열을 충분히 차단할 수 있는 것으로 분석되었고, 이를 실험을 통해 검증하였다. In this study, a 2-W micro-gas turbine engine was designed using micro-electro-mechanical systems (MEMS) technology, and analytical and experimental investigations of its potential under actual combustion conditions were performed. An ultra-micro-gas turbine contains a turbo-charger, combustor, and generator. A compressor, turbine blade, and generator coil were manufactured using MEMS technology. The shaft was supported by a precision computer numerical control machined air bearing, and a permanent magnet was attached to the end of the shaft for generation. An analysis found that the cooling effect of the air bearing and compressor was sufficient to cover the combustor heat, which was verified in an actual experiment.
Global Front wheel drive 6 speed Automatic Transmission GEN2소개
최준혁(JunHyuk Choi),권경문(KyungMun Kwon) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Global Front wheel drive 6-speed automatic transmission family(GF6) was launched globally in 2007 from Korea market. Now in average every 15 second GF6 transmission is built in one of the 5 transmission plants in Korea, China, Mexico, Canada and the United States. In recent years, many automotive Company have been striving to increase fuel economy and to decrease CO2 emission. The reduction of CO2 emissions and improvement of fuel economy can be seen as a general market need. With facing this demand, the GF6 family of General Motors transmission has been analyzed for market demand. The second generation of the GF6(GF6 GEN2) can be divided into two major portion. The first upgrade for GF6 GEN2 is control changes. This upgrade is aiming at improving shift quality and fuel economy with multiple changes to the control system and clutches. And, the second upgrade is hardware such as clutch and hydraulic circuit. It had its debut in the Unites states from 2012 and now will be rolled out in over 100 GM vehicle applications with including Korea market.