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RISS 인기검색어
- 검색키워드
- 저자 : 최환영 ( Hwan Young Choi ) (검색결과 11 건)
- 무료
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최환영,채종민,Choi, Hwan-Young,Chae, Jong-Min 대한수사과학회 2007 대한수사과학회지 Vol.2 No.1
Apartments are built in small countries to accommodate densely populated cities and maximize urbanization. Many apartment complexes have been built in recent reconstruction or redevelopment projects. An increase in crime has resulted due to residents living in a narrow space. Larceny is the most commonly reported crime in apartment complexes. Apartments can be classified as stairway, hallway, or plane surface. This study compares and analyzes the frequency of theft by apartment type to assist in creating a safer residential space. In America and England, scholars studied to make a safer residential space, and have applied the theory of 'the Defensible Space' and 'Crime Prevention Through Environmental Design(CPTED)' since 1970s. Korean apartment design now reflects CPTED in new apartment construction. In this study, 12 apartment complexes were selected in Changwon city to conduct analysis of theft in selected complexes. The study will cover housing invasion theft, motorcycle and car theft and snatching. The most frequency larceny is motorcycle and car theft, the second is housing invasion theft, and the least frequent is snatching. More residents' motorcycles and cars are damaged in a hallway style apartment. More frequently inhabitants have their possessions snatched on a stairway form. 1) When we build new apartment complexes, we must plan to improve territoriality and enhance a natural surveillance by reinforcing dwellers' relationship. Through planning we can prevention the larceny in apartments.
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롤생산방식 유연회로기판의 레이저 드릴링 고속화 요소기술
라웅재 ( Woong-jae Ra ),최환영 ( Hwan Young Choi ) 한국실천공학교육학회 2023 실천공학교육논문지 Vol.15 No.1
Authors report the performance indicator of Roll to Roll MC (hereinafter referred to as RTR) through experiment that it is pos sible to process 2.0G acceleration, which cannot be coped with in the existing FPCB RTR, by reducing the weight of the Dancer roll system and controlling the torque using the servo motor. Proposed dancer roll system provides uniform tension to FPCB by solving problems such as high rotation speed, heat generation, and low torque, which were impossible to achieve with the conventional magnet clutch type RTR. Through the development of a lightweight processing method for rolls using magnesium material and the development of a torque control algorithm for servo motor, torque stability also increased. Due to the enabling technology developed in this study, the reaction speed of the dancer roll was improved and the target speed was achieved as well.
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Microlens Array를 이용한 자동차 커뮤니케이션 램프 설계 방안 연구
서재영,이현화,공미선,최환영,정미숙,Seo, Jae-Yeong,Lee, Hyun-Hwa,Kong, Mi-Seon,Choi, Hwan-Young,Jung, Mee-Suk 한국광학회 2021 한국광학회지 Vol.32 No.3
In this paper, a study of the design of automotive communication lamps using microlens arrays (MLAs) was conducted. With the development of autonomous driving technology, automobiles need communication lamps to communicate with pedestrians. To reduce the size of the optical system and secure high light intensity, the communication lamp's optical system was designed using an MLA. In addition, to secure a clear image on inclined ground, the design was carried out considering the overlap method. After that, the improved performance was confirmed by comparing it to the MLA optical system before overlapping.
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UV-C LED를 이용한 유수살균장치의 자외선 조사량 및 균일도 개선을 위한 광학계 설계 연구
이예은(Ye-Eun Lee),최환영(Hwan-Young Choi),정미숙(Mee-Suk Jung) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.4
This paper carried out the study of optical system design which can increase the irradiation volume and uniformity of UV LED lamp used in oil-water sterilization device. Sterilizing devices that use LEDs have lower output than UV lamps, making it difficult to sterilize running water as they require a long time to reach the target amount of irradiation. In addition, Cytop, a material used in optical design, has a high transmittance at 275 nm, but the high price range requires minimum volume in optical design. To solve these problems, the volume of the optical system was minimized. In addition, optical system design of sterilizing device was carried out to satisfy target irradiation quantity and have high illumination intensity uniformity. Finally, the design was verified by applying the optical system designed to the actual sterilization environment to carry out the simulation and analyzing the amount of irradiation and uniformity accordingly.
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최정균(Jung Kyun Choi),최환영(Hwan Young Choi),윤임하(Im Ha Yun),양승곤(Seoung Gon Yang),김태진(Taejin Kim),김기돈(Kidon Kim),김현우(Hyunwoo Kim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
지하 또는 지상에 설치된 지하철은 단거리 이동에 주로 운영되고 많은 시민고객들을 위해 운영되는 대중교통수단이다. 승객이 느끼는 승차감은 고정된 객차에 설치된 센서로부터 얻어지는 가속도와 소음데이터, 그리고 레일의 상태를 체크하기 위해 정기적으로 운영되는 검측차 데이터로 분석 되어지고 있다. 그러나 신호가 고정된 객차에서 얻어지기 때문에 위치에 따른 승객들의 많은 의견을 반영하여 분석하기 어렵다. 따라서 이동형 승차감 계측장치는 각 객차의 어느 곳에서도 가속도와 소음의 계측이 가능한 계측수단을 제공하고 있으며, 계측된 결과를 효과적으로 분석할 수 있는 분석프로그램을 개발하였다. 이동형 승차감 계측장치는 승객이 밀집하고 복잡한 객차 내에서 센서를 위치시키고 계측할 수 있는 장치와 계측의 편의를 제공하는 계측프로그램 및 분석프로그램으로 구성되어 진다. Metro public transportation which is installed underground or on the ground moves in short distance and is available for a number of passengers. The riding comfort for the passenger is analyzed by acceleration and sound data that is obtained from a sensor installed on the fixed carriage and also data of the track inspection car which is operated to check the rail status regularly. However, it"s not easy to analyze the each opinion from a number of passengers in different carriages because the signal is sent from the fixed carriage. So we invented the "Portable riding comfort measurement system" and with this device, we can measure the acceleration and noise from every carriage in all different spots. The "Portable riding comfort measurement system" consists the device which locates the measuring sensor in the crowded carriages and the measuring & analyzing program providing high convenience.
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김동욱 ( Dong-wook Kim ),최환영 ( Hwan Young Choi ) 한국실천공학교육학회 2023 실천공학교육논문지 Vol.15 No.1
The Work-Study parallel program has been promoted as a key policy to resolve the mismatch between industrial sites and school education and realize a competency-centered society, and as of December 2022, 16,664 companies participated in the training. Learning companies play a very important role as education and training supply organizations that conduct field training. In this study, for the evaluation of learning companies participating in work-study program, the authors derive important factors that de termine the quality of on-site education and training by analyzing the cognitive structure of experts in charge of the company and present evaluation indicators for learning enterprises. Therefore, it is intended to lay the foundation for promoting the quality of work-study parallel program.
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웨이브 솔더링 공정 개선을 위한 팔레트 도입 사례 연구
나승천 ( Seung-chun Na ),최환영 ( Hwan Young Choi ) 한국실천공학교육학회 2024 실천공학교육논문지 Vol.16 No.2
Printed circuit boards (PCBs) are a key component widely used in the production of electronic products, and not only quanti tative growth but also qualitative developments such as integration cannot be ignored. Wave soldering equipment is commonly used equipment at manufacturing sites, but it is impossible to configure a dedicated equipment environment suitable for each PCB specification during the preliminary research and prototype development stage. It is neither suitable for development within limited time line nor manufacturing various product groups because only equipment setting conditions can be changed within a given time. In this study, we introduce a case of introducing a PCB pallet to enable selection of optimal process conditions within the limited environment described above. In addition, by presenting a discriminant that can determine in advance whether production is possible with current general-purpose equipment, it is expected that problems that may arise due to limitations in the general-purpose wave soldering equipment environment can be identified and resolved in advance. Ultimately, this palette makes it possible to shorten the development period and improve productivity.
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