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이병일 ( Byeong Il Lee ),김현식 ( Hyeon Sik Kim ),정혜진 ( Hye Jin Jeong ),이형재 ( Hyung Jae Lee ),문성민 ( Seung Min Moon ),권성영 ( Seung Young Kwon ),최은서 ( Eun Seo Choi ),정신영 ( Shin Young Jeong ),범희승 ( Hee Seung Bo 대한핵의학회 2009 핵의학 분자영상 Vol.43 No.4
목적: 광학영상기술은 소동물이나 임상연구에서 분자영상법으로 알려진 첨단연구 분야이다. 광학영상기기는 소동물영상연구 및 추적연구에 중요한 역할을 수행하고 있다. 발광영상에서 소동물을 영상화 하기 위해서는 피부조직을 뚫고 나오는 광자를 검출하기 위한 고민감도 CCD카메라가 필요하다. 이 연구에서는 소동물에서 발생하는 발광신호를 검출하기 위해 개발한 광학영상기기를 소개하고자 한다. 대상 및 방법: 냉각형 CCD카메라와 집광렌즈, 8개의 백색광 LED 광원을 암실상자 안에 장치하였다. 팬텀 및 튜브를 이용한 영상을 얻은 후 발광 박테리아를 이용하여 CT26 암모델 누드마우스에서 영상을 획득하였다. 결과: 발광영상을 얻기 위한 광학영상기기를 설계하고 개발하였다. 영상획득이 성공적으로 수행되었고, 시스템을 완성하였다. 개발된 장비는 분자영상연구에 사용되고 있다. 결론: 개발된 광학영상장비는 다양한 실험적 조건을 만족하는 연구에 최적화하여 유용한 도구로 자리잡을 것으로 기대한다. Purpose: Optical imaging is providing great advance and improvement in genetic and molecular imaging of animals and humans. Optical imaging system consists of optical imaging devices, which carry out major function for monitoring, tracing, and imaging in most of molecular in-vivo researches. In bio-luminescent imaging, small animals containing luciferase gene locally irradiate light, and emitted photons transmitted through skin of the small animals are imaged by using a high sensitive charged coupled device (CCD) camera. In this paper, we introduced optical imaging system for the image acquisition of bio-luminescent signals emitted from small animals. Materials and Methods: In the system, Nikon lens and four LED light sources were mounted at the inside of a dark box. A cooled CCD camera equipped with a control module was used. Results: We tested the performance of the optical imaging system using effendorf tube and light emitting bacteria which injected intravenously into CT26 tumor bearing nude mouse. The performance of implemented optical imaging system for bio-luminescence imaging was demonstrated and the feasibility of the system in small animal imaging application was proved. Conclusion: We anticipate this system could be a useful tool for the molecular imaging of small animals adaptable for various experimental conditions in future. (Nucl Med Mol Imaging 2009;43(4):344-351)
표면 코팅 입자에 의한 석탄화력 발전용 보일러 파울링 수치적 연구
이병은,유갑종,신세현,권순범,Lee, Byeong-Eun,Yu, Gap-Jong,Sin, Se-Hyeon,Gwon, Sun-Beom 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.3
Fouling deposits due to surface-coated particles have been calculated using CFD techniques. The sticking probabilities of the surface-coated particles are also evaluated on the basis of an energy balance. The sticking probabilities of the deposit surface are also included in the prediction of the deposition occurring through the multiple impaction of particles with the deposit surface. The sticking probability of an impacting particle is expressed in terms of such parameters as particle viscosity, surface tension, impact velocity, impact angle and the thickness of the sticky layer on a particle. Particulate behavior around a tube in cross flow was studied using the Lagrangian approach. Three important parameters i.e. impact velocity, impact angle, and particulate concentration, were used in the prediction of deposition rate. The computational predictions were found to be in good agreement with the experimental data.
이병선,박재우,은종원,이호진,Lee, Byeong-Seon,Park, Jae-Woo,Eun, Jong-Won,Lee, Ho-Jin 한국전자통신연구원 1992 전자통신 Vol.14 No.1
정지궤도에 위치한 위성에 있어서 지구에 의한 식은 일년에 두 기간에 걸쳐서 정기적으로 발생한다. 반면에 달에 의한 식은 궤도의 위치에 따라 불규칙적으로 발생하다. 식이 일어날 때 위성은 태양을 이용한 전력생산을 할 수 없게 되기 때문에 식시간에 대한 예측은 정지궤도상의 통신위성 또는 방송위성을 운용하는데 있어서 매우 중요하다. 본 연구에서는 정지위성을 공칭위치에 고정시켜 놓고, 적도 좌표계에서 태양과 달의 시간에 따른 위치를 계산함으로써 지구와 달에 의한 식을 예측하였다. 또한 정지위성의 위치유지 각 한계점에서의 식을 예측해서 궤도위치에 따른 식시간과 식깊이를 비교해 보았다. 정지궤도상의 위성은 1995년에 발사될 동경 $116^{\circ}$의 무궁화 위성으로 하였다.
이병은(Byeong-Eun Lee),하현천(Hyeon-Cheon Ha),김재수(Jae-Soo Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Hydrogen seal systems of the electricity generator for a nuclear power plant have been analyzed using computational fluid dynamics techniques. The seal system has been operated with two serious problems. The first one is that the seal temperature has been increased progressively, after scheduled overhaul, and the other is that differential pressure between inlet oil and hydrogen has been increased simultaneously. In order to solve these problems, CFD study has been done and results are discussed in this paper. Two types of the seals, flat type and tapered land type, have been compared in terms of force acting on the thrust collar, seal temperature, and oil flow rate. It was found from this study that the flat type seal is not appropriate because the acting force on the collar is not enough to maintain proper oil film thickness and this is main cause of temperature rising occurred in the seal. It has been reported from the operation history that the modified tapered land seal developed from this study shows excellent operating characteristics.
이병은(Byeong-Eun Lee),김종인(Jong-In Kim),김무용(Moo-Yong Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Moisture contained in the steam generated in the steam generator for large nuclear power plants is removed initially in the moisture separator by the centrifugal force acting on them. Then, the rest of moisture, which is composed of relatively small water droplets, is removed in the dryer vane by inertia force and finally dry steam, which is almost superheated steam, is produced in the steam generator and it is sent to steam turbine to produce electricity. The mechanism of moisture removal is quite complex because of complex geometry and complex flow behavior in it. CFD techniques have been used to investigate the flow behavior and calculate the moisture removal efficiency in the present study. Unit cell test has also been conducted to validate CFD results. Comparison of the numerical predictions for the water droplet removal in a steam generator with experimental data shows very good agreement. However, only CFD results have been discussed in this paper.
직사각형 MEMS 판 구조의 리츠 해석 (I);수식화 및 수치해법
김은석,이병채,Kim, Eun-Seok,Lee, Byeong-Chae 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.2
We apply the Rayleigh Ritz method to analyze multi-layered plates with residual stresses. The method is very simple, straight forward, and easily programmable, but it should be applied to structure s only in simple shapes. We derive coupled variational equations based on the principle of virtual displacement, and investigate what kind of basis functions is desirable for the analysis of rectangular plates with various boundary conditions. We demonstrate the effectiveness and usefulness of the method through several examples. The analysis results obtained with the method are in good agreement with those available in literature. A multi-layered MEMS plate example shows that the coupling effect should not be ignored and that residual stresses do influence the stiffness of the structure very much.
육심균,김성호,이병은,이상룡,Yook, Sim-Kyun,Kim, Sung-Ho,Lee, Byeong-Eun,Lee, Sang-Ryong 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.12
An optimal soot blowing system has been developed for an optimal operation of power utility boilers by both minimization of the use of steam and the number of soot blowers worked during soot blowing. Traditionally, the soot blowing system has been operated manually by operators. However, it causes the reduction of power and thermal performance degradation because all soot blowers installed in the plant should be worked simultaneously even there are lots of tubes those are not contaminated by slagging or fouling. Heat transfer area is divided into four groups, furnace, convection area including superheater, reheater and economizer, and air preheater in the present study. The condition of cleanness of the tubes is calculated by several parameters obtained by sensors. Then, a part of soot blowers works automatically where boiler tubes are contaminated. This system has been applied in a practical power plant. Therefore, comparison has been done between this system and manual operation and the results are discussed.
서라운드 뷰 영상에서의 가버 (Gabor) 필터와 폴라 (Polar) 히스토그램을 이용한 정지 및 이동 물체 검출 알고리즘
표영일(Young-Il Pyo),이병은(Byeong-Eun Lee),한영인(Young-In Han) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In this paper stationary and moving objects detection algorithm based on the Gabor filtering and Polar histogram is proposed. To generate the surround view, acquired images from four fisheye cameras that are mounted on the car are used. After generating surround view, object detection algorithm is applied to this view. The procedure of object detection algorithm is as follows. In the first step, Finding areas that are considered as object, Gabor filter is used. Differently from general view image, objects in surround view appears horizontally. Using this characteristic, Gabor filter is used in the direction of 0 degree only. After using Gabor filter, to increase the accuracy, Canny edge detection is used to eliminate false areas that are detected in the first step. The objects exist in surround view in the direction of the camera optical axis radiation. Using this characteristic, Polar histogram is extracted and bins that have high value than threshold value are determined objects. The proposed algorithm have the recognition rate of 94% in the indoor and outdoor place videos with vehicle is stopped.