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이복원(Bok-Won Lee),김천곤(Chun-Gon Kim),박미영(Mi-Young),정한구(Han-Koo Jeong) 한국항공우주학회 2007 韓國航空宇宙學會誌 Vol.35 No.12
고속 및 고효율의 해양 수송수단에 대한 필요성이 점차 증가되면서 위그선(WIG: Wing in Ground effect)이 차세대 수송수단으로 관심이 집중되고 있다. 이러한 고속 해양 수송선의 구조설계 시 수면에 대한 충격하중은 중요하게 고려되어야 할 하중요소 중의 하나이며 착수하중에 의한 동적거동은 손상을 초래하는 중요한 요소이다. 본 연구에서는 위그선 착수 시 수면 충격하중에 대한 수치해석을 통해 선체의 동적거동을 평가하였다. 착수환경에서의 수면충격하중을 ALE (Arbitrary Lagrangian-Eulerian) 유한요소법을 적용하여 해석을 수행하였으며 3차원 쉘요소를 적용한 전기체 모델을 개발하여 위그선의 착수환경에서 선체의 동적거동을 모사하였다. 착수환경은 정상 착수조건과 측풍에 의한 비정상 착수조건 두 가지를 고려하여 해석을 수행하였으며 이러한 착수환경이 위그선 구조의 정적 구조 안정성에 미치는 영향을 평가하였다. Demand for high speed sea transportation modes has been increased dramatically last few decades. The WIG(Wing-in-ground effect) is considered as next generation maritime transportation system In the structural design of high speed marine vessels, an estimation of water impact loads is essential. The dynamic structural responses of the WIG excited by the water impact loads may bring an important contribution to their damage process. The work presented in this paper is focused on the numerical simulation of the water impact on the WIG craft when it lands. It is aimed to study the structural responses of the WIG craft subjected to the water impact loads. The Arbitrary Lagrangian-Eulerian (ALE) finite element method is used to simulate the water impact of the WIG craft during a landing phase. A full 3D shell element is used to model the WIG craft in carbon composites, and a developed FE model is used to investigate the effect of the water impact loads on the structural responses of the WIG craft. In the analysis, two different landing scenarios are considered and their effects on the structural responses are investigated.
이복임,김윤미,김윤정,서은옥,이동근,이석희,이수미,한경미,한유진,Lee, Bok-Im,Kim, Yun-Mi,Kim, Yun-Jung,Seo, Eun-Ok,Lee, Dong-Gun,Lee, Seock-Hee,Lee, Soo-Mi,Han, Kyung-Mi,Han, Yu-Jin 한국학교보건학회 2012 韓國學校保健學會誌 Vol.25 No.1
Purpose: The purpose of this study was to examine the relationship between health behavior and residence types of university students. Methods: Using a quota sampling method by gender and residence type, 364 male and female students (126 students who live in their own house (SH), 123 students who live in board themselves (SB), and 115 students who live in a dormitory (SD)) were selected from one university in Ulsan. Five categories on smoking, drinking, exercise, eating, and sleeping were used to describe health behavior of the participants. Results: Difference of smoking, drinking, eating, and sleeping habits was existed in classifications of residence types of participants. Regarding the current smoking rate, frequency of drinking, and amount of drinking, the result of SB was higher than that of SH or SD. The score of eating habit of SB was lower than that of SH or SD. SD exercised much less than SB or SH. Conclusion: To prevent aggravation of SB health habits, an education program for comprehensive health promotion is needed for university students to improve their smoking, drinking, exercise, and eating habits.
기술노트 : NPS-WET 모형을 이용한 인공습지의 수질정화효과 분석
이한필 ( Han Pil Rhee ),정광욱 ( Kwang Wook Jung ),이복수 ( Bok Soo Lee ),함종화 ( Jong Hwa Ham ),손영권 ( Yeong Kwon Son ) 한국물환경학회 ( 구 한국수질보전학회 ) 2012 한국물환경학회지 Vol.28 No.2
A combination system of catch canal and constructed wetland was designed and suggested to improve water quality in gagricultural region of lower Dong-jin river basin. In order to evaluate an water quality improvement efficiency of the designed combination system, the NPS-WET model was applied in this study. Simulation result of the NPS-WET shown that the nutrient load removal rate of constructed wetland was BOD, T-N, T-P and SS was 30.7~39.0%, 46~60%, 40.7~57.0% and 68.2~74.7%, respectively. Nutrients reduction of constructed wetland was higher in growing season than winter season because vital activity of microorganism, macrophyte and algae was augmented with high air and water temperature. Effluents from constructed wetland can affect water-quality of catch canal drains, especially, water-quality on junction point to Dong-jin river. Water-quality improvement in low-flowed catch canal (Un-san) was more significant than in high-flowed catch canal (Won-pyeong). In conclusion, a feasible design of constructed wetland is necessary to treat large quantity of receiving water. The NPS-WET is useful tool for assessing water-quality improvement efficiency using constructed wetland.
한국어 교육을 위한 대중 공개 온라인 강좌(MOOC) 개발의 원리와 실제 -`Learn to Speak Korean 1`사례를 중심으로-
한상미 ( Han Sang Mee ),이복자 ( Lee Bok Ja ),최유경 ( Choi Yoo Kyung ),조하민 ( Cho Ha Min ) 연세대학교 언어연구교육원 한국어학당 2016 외국어로서의 한국어교육 Vol.45 No.-
The present study reports the principles and practice of the development of `Learn to Speak Korean 1`, a Korean language education MOOC launched in Coursera by the Korean Language Institute at Yonsei University on July 6th, 2016. `Learn to Speak Korean 1` was developed in order to provide high-quality Korean education contents to the Korean learners all over the world, overcoming the limit of time, space and cost. First, the study examines the concept and development of MOOC, the characteristics of MOOC and previous studies on MOOC-based foreign language education. Next, the process of developing `Learn to Speak Korean 1` is presented in detail; objectives of the development, target learners, basic research, planning the syllabus, making sample videos, confirming the final video model, filming the video and follow-up measures. Also, this study examines the principles of developing `Learn to Speak Korean 1` - the authenticity of contents, learner-autonomy, and interactivity, and based on these principles, the actual realization of the lecture is shown in the aspect of the whole lecture construction and individual unit structure. (Yonsei University)
고효율 및 저전압 동작 특성의 Q-band MIMIC HEMT발진기
이문교,안단,이복형,김성찬,임병옥,한효종,채연식,신동훈,김용호,박형무,이진구,Lee, Mun-Kyo,An, Dan,Lee, Bok-Hyung,Kim, Sung-Chan,Lim, Byeong-Ok,Han, Hyo-Jong,Chae, Yeon-Sik,Shin, Dong-Hoon,Kim, Yong-Hoh,Park, Hyung-Moo,Rhee, Jin-Koo 대한전자공학회 2004 電子工學會論文誌-TC (Telecommunications) Vol.41 No.4
In this paper, we present the low voltage and high efficiency Q-band MIMIC oscillator using device-level power combined structure. The oscillator was successfully integrated by using 0.1 ${\mu}{\textrm}{m}$ GaAs PHEMTS and the CPW transmission line. We show that the highest efficiency is 19 % with an output power of 2.6 ㏈m at a frequency of 34.56 ㎓. The operating voltage of the oscillator is 2.2 V which is lower voltage than that of previously reported oscillators at Q-band. And the maximum output power of 6.7 ㏈m was obtained at a frequency of 34.56 ㎓. 본 논문에서는 소자 결합 구조를 통해 발진전력이 합쳐지는 회로를 이용한 저전압, 고효율 Q-band MIMIC 발진기를 제안한다. 0.1 ㎛ GaAs PHEMTS와 CPW 전송라인을 사용하여 제안된 구조의 발진기를 성공적으로 집적화하였다. 제작된 발진기는 34.56 ㎓ 주파수에서 2.6 ㏈m의 출력 전력일때 19 %의 높은 효율특성을 가졌다. 이때 회로에 인가된 전압은 2.2 V로 현재까지 Q-band에서 발표된 발진기보다 낮은 구동전압 특성을 얻었다. 또한 최대 출력 전력은 34.56 ㎓ 주파수에서 6.7 ㏈m을 얻었다.
GPGPU를 활용한 OpenFOAM 기반 해석자 성능 분석
한서음(Seoeum Han),정황희(Hwanghui Jeong),이복직(Bok Jik Lee) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.2
Two benchmark tests were carried out to analyze the performance of OpenFOAM-based CFD solvers using General-Purpose computing on Graphics Processing Units(GPGPU). In the present study, RapidCFD, which is an implementation of OpenFOAM capable of running most of the functions of OpenFOAM on GPUs, was used to apply GPGPU to OpenFOAM. The numerical simulations of 1) 3D lid-driven cavity incompressible flows and 2) steady flows around a motorbike were conducted on two kinds of CPU, single-GPU, and multi-GPU systems, and the computational times were analyzed. For the test of cavity flows, as the number of cells increased, the performance and the scalability of GPGPU were improved. When the number of cells was 2503, a system with 8-GPUs showed the highest performance with 42 times of speedup over a CPU system. For the test of flows around a motorbike, a system with 8-GPUs showed the highest performance with 20 times of speedup over a CPU system. For both single precision and double precision calculations, the performance improvements using GPGPU were efficient. The results demonstrate that GPGPU would be more efficient than computing on CPUs when computing large-scale flows and practical problems that require massive parallelism.
권혜경,정재심,이복임,김장한,Kwon, Hye-kyung,Jeong, Jae-sim,Lee, Bok-im,Kim, Jang-han 한국의료질향상학회 2015 한국의료질향상학회지 Vol.21 No.2
Objectives: This study was conducted as descriptive correlation research in order to survey healthcare personnel(HCP)'s awareness of patient safety culture and their recognition of standard precautions, and to examine the correlation between the two factors. Methods: The subjects were 400 HCPs including 80 doctors, 240 nurses, and 80 medical technicians from two general hospitals. The questionnaire used in the survey consisted of 9 questions on general characteristics, 44 on the perception of patient safety culture, and 21 on the recognition of standard precautions. Results: According to the subjects' general characteristics, the score was significantly higher in those aged over 40 than in those aged 30-39. In addition, it was significantly higher in managers than in practitioners, in those with work experience of less than a year than in those with 5-9 years. The score was also significantly higher in those working 8 hours a day than in those working over 10 hour a day. The number of medical accident reports according to the subjects' general characteristics was significantly larger in nurses than in doctors, in managers than in practitioners, and in those with 10 years' or longer experiences than in those with less than a year. In the awareness of standard precautions according to the subjects' general characteristics, the score was significantly higher in female workers than in male workers, and in managers than in practitioners. As a whole, the subjects' awareness of patient safety culture and their recognition of standard precautions showed a significant correlation with each other. Conclusion: From the result of this study, sufficient work force and the promotion of organizational culture for safety is needed in order to guarantee patient safety. Likewise, these results suggest that experience, job skill, and adequate working hours have a positive effect on the awareness of patient safety culture and the recognition of standard precautions.