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정재한 ( Jae Han Jung ),김명수 ( Myung Soo Kim ),임헌상 ( Heon Sang Lim ),김용수 ( Yong Soo Kim ) 한국품질경영학회 2013 품질경영학회지 Vol.41 No.4
Purpose: The purpose of this study was to estimate life time of halogen lamps and acceleration factors using accelerated life test. Methods: Voltage was selected as an accelerating variable through the technical review about failure mechanism. The test was performed at 14.5V, 15.5V and 16.5 for 4,471 hours. It was assumed that the lifetime of Halogen lamps follow Weibull distribution and the inverse power life-stress relationship models. Results: Mean lifetimes of pin and screw types were 19,477 hours and 6,056 hours, respectively. In addition,acceleration factor of two items are calculated as 4.8 and 2.2 based on 15.5V, respectively. Conclusion: The life-stress relationship, acceleration factor, and MTTF at design condition are estimated by analyzing the accelerated life test data. These results suggest that voltage was very important factor to accelerate life time in the case of halogen lamps and the life time of pin type is three times longer than screw type lamps.
정재한 ( Jae Han Jung ) 현대사진영상학회 2016 현대사진영상학회논문집 Vol.19 No.1
The sophisticated visualization and public reprimanding ability of photography has contributed more to the popularization of the art than any other media. Reprimanding capability of photography in early years contributed to overcoming the elitism and aristocratism that rationalized the gap between the classes, turning them into more public-centered culture. Recently, the advancement of digital technology and public distribution of photography skills are not only contributing to the cultural enjoyment but also to the technological democratization that enables professional production of photography. In this research we would like to focus on the creative project piece analysis and discussion about it that has been proceeded in socially participated art and artbehavioristic view, based on the digital technology as well as reprimanding capacity of photography. Particularly, we will introduce the motivation and objective of JR’s art project [Inside out], a photographer who won the TED award 2011, and demonstrate the purpose of [Inside out] currently undergoing across 120 nations and the master’s work theory that takes political and social conflict suffered by Korean society as the main subject.
니켈-수소저항합금전지 음극의 방전특성에 미치는 성형첨가제의 영향
정재한(Jae Han Jung),이한호(Han Ho Lee),김동명(Dong Myung Kim),이기영(Kee Young Lee),이재영(Jai Young Lee) 한국수소및신에너지학회 1995 한국수소 및 신에너지학회논문집 Vol.6 No.2
Negative electrode was prepared by mixing Ti<sub>0.7</sub>Zr<sub>0.3</sub>Cr<sub>0.3</sub>Mn<sub>0.3</sub>V<sub>0.6</sub>Ni<sub>0.8</sub> alloy powder with copper or nickel powder and pressing in the air. The cycled electrodes were analyzed with SEM, potentiostat and electrochemical impedance spectroscopy. It was found that the Cu-compacted electrode showed better low temperature dischargeability and higher rate capability than Ni-compacted electrode. From SEM analysis of the cycled electrode compacted with copper powder, it was observed that the surface of MH particles was covered with copper grains and whisker precipitated from electrolyte after dissolution during cell test. It is found that the improved electrode characteristics are attributed to the copper layer on MH particles deposited by dissolution and precipitation(DP) process.
드론영상의 3D맵핑 화질개선에 관한 연구 : 피사계심도에 의한 맵핑효율성 증대를 중심으로
정재한 ( Jung Jae_han ) 현대사진영상학회 2018 현대사진영상학회논문집 Vol.21 No.2
The image processing technology using drone has rapidly come into wide use due to the development of the fourth industry. The purpose of this study is to derive the production guide that is necessary to produce 3D mapping images by using multiple 2D images. I tried to derive more efficient data through various experiments to improve 3D mapping efficiency from the 2D images taken under the same conditions. Through these efforts, I hope that a reliable standard guide data would be prepared as soon as possible to minimize trial and error in the video(image) production site and to produce better contents easily.
합병증을 동반한 기관지 땅콩 흡인에서 체외막산소화 장치를 통한 치료 1예
정재화 ( Jae Hwa Jung ),설인숙 ( In Suk Sol ),윤서희 ( Seo Hee Yoon ),김민정 ( Min Jung Kim ),김윤희 ( Yoon Hee Kim ),신홍주 ( Hong Ju Shin ),박한기 ( Han Ki Park ),김경원 ( Kyung Won Kim ),손명현 ( Myung Hyun Sohn ),김규언 ( Kyu 대한천식알레르기학회(구 대한알레르기학회) 2016 Allergy Asthma & Respiratory Disease Vol.4 No.2
Foreign body aspiration commonly occurs, especially among children younger than 3 years of age. Most endobronchial foreign bodies may be easily removed by bronchoscopy and have a good prognosis. Despite advances in bronchoscopic procedures, difficulties in management of and complications from foreign body aspiration are still noted. We present a foreign body aspiration case with acute respiratory distress syndrome caused aspiration pneumonia, which was successfully treated by bronchoscopy under extracorporeal membrane oxygenation (ECMO). ECMO can be an effective and potentially life-saving method in complicated foreign body aspiration with uncompensated respiratory failure. (Allergy Asthma Respir Dis 2016;4:140-144)
정재한(Jae-Han Jung),박승근(Seung-Geun Park),임우섭(Woo-Sub Lim),오재성(Jae-Sung Oh) 한국화재소방학회 2020 한국화재소방학회논문지 Vol.34 No.6
본 연구는 기존 포소화약제(알코올포)와 테스트포를 실험을 통해 성능을 비교·분석하였다. 약제를 1%, 3% 혼합비율로 방출시키기 위하여 라인 프로포셔너 방식을 사용하였다. 프로포셔너의 입/출구 둘레는 40 A이며 폼 조절기를1%, 3%로 각각 사용하였다. 기본 변수인 유량, 압력, 측정시간은 200 LPM, 350 kPa, 60 s로 유지하였으며, 물, 알코올포, 테스트포 순으로 혼합 비율의 변화를 중점적으로 분석하였다. 실험 데이터 처리 방법은 「포소화약제혼합장치 등의 성능인증 및 제품검사 시험세칙」 규정에 따라 진행하였다. 실험 결과는 테스트포 1% 혼합 실험의 경우, 평균 방출 혼합 비율이 1.19%로 1% 포소화약제 혼합 비율 기준인 1~1.3% 범위 내에 있으므로 성능 인증되었다. 테스트포3% 혼합 실험의 경우, 평균 방출 혼합 비율은 3.05%로 3% 포소화약제 혼합 비율 기준인 3~3.9% 범위 내에 있으므로성능 인증되었다. In this study, the performance of foam agents and test foam is compared and analyzed through experiments. The lineproportioner method is used to release the foam agents at a mixing ratio of 1% and 3%. The inlet/outlet circumference ofthe proportioner is 40 A, and foam regulators are used at 1% and 3%, respectively. The basic variables such as flow rate,pressure, and measurement time are maintained at 200 LPM, 350 kPa, and 60 s, and the change in the mixing ratio isanalyzed in the order of water, alcohol foam, and test foam. The experimental data processing method is carried out inaccordance with the regulations of Korea Fire Institute (KFI). In the case of the test foam 1% mixing experiment, theperformance is certified because the average emission mixing ratio is 1.19%, which is within the range of 1~1.3%. In thecase of the test foam 3% mixing experiment, the average emission mixing ratio is 3.05%, which is within the range of3~3.9%.
정재한(Jung, Jae Han),김석주(Kim, Seok Joo) 한국테러학회 2014 한국테러학회보 Vol.7 No.1
본 연구에서는 개인정보에 대한 국민들의 인식을 바탕으로 증가하는 사이버테러로 인한 개인정보 침해를 감소시키기 위한 방안을 다음과 같이 제시하였다. 우선 개인정보보호법 및 개인정보 침해 대응 기관에 대한 적극적 홍보활동이 필요하다. 둘째, 개인정보의 인격권적 가치가 강화되어야 하며 셋째, 기업의 개인정보 관리 중요성에 대한 인식 제고가 이루어져야 한다. 넷째, 개인정보 유출 통지 의무를 강화하고 다섯째, 수집 개인정보의 항목을 축소하고 특히 주민등록번호를 대체할 수 있는 수단을 모색할 필요가 있다. 여섯째, 열람ㆍ정정ㆍ삭제 등 개인정보에 대한 권리를 실효적으로 보장할 수 있는 방안을 마련해야 하며 마지막으로 개인정보보호 미흡 기관에 대한 관리ㆍ감독을 강화해야 한다. 해킹 사이버테러의 기술적 특성을 감안할 때 사이버테러로 인한 개인정보 유출을 완전히 근절할 수는 없을 것이다. 따라서 보호할 것은 두텁게 보호하고 이용할 것은 합리적으로 이용할 수 있는 제도적 체계의 확립이 중요하다고 할 것이다. This article has attempted to propose the solutions for infringement of the personal information by Cyber Terror based on public awareness about the personal information. First, it needs active public relations about Personal Information Protection Act and its government response authority. Second, it must strengthen the value of rights of privacy on personal information and Third, private companies should raise awareness about the importance of the public information management. Fourth, enhancing the obligation of notifying personal information leakage and Fifth, it is necessary to reduce the items of personal information and especially find out an alternative Resident Registration Number. Sixth, it needs to draw up measures effectively to assure the rights of inspection, amendment, and to be forgotten. Lastly, the supervision and management against the inadequate government agency have to be strengthened. The technological characteristic of the cyber terror suggests that it is difficult to achieve complete extermination of personal information leakage. In conclusion, it is important to establish the institutional framework to protect and utilize effectively.