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김재홍,성환우,권용국,이윤정,최준구,조성준,김민철,이은경,장환,위성환,모인필,송창선,박종명,Kim, J.H.,Sung, H.W.,Kwon, Y.K.,Lee, Y.J.,Choi, J.G.,Cho, S.J.,Kim, M.C.,Lee, E.K.,Jang, H.,Wee, S.H.,Mo, I.P.,Song, C.S.,Park, J.M. 한국가금학회 2004 韓國家禽學會誌 Vol.31 No.2
Highly Pathogenic Avian Influenza (HPAI) is a very acute systemic disease in poultry, particularly in chickens and turkeys caused by HPAI viruses. An outbreak of HPAI caused by subtype H5N1, was first reported in a broiler breeder farm on December 10, 2003 in Korea, although there had been twenty one outbreaks of the disease reported in the world before. Since mid-December 2003, eight Asian countries have confirmed outbreaks of HPAI due to the same subtype. The outbreak has also resulted in at least twenty three fatal human cases in Vietnam and Thailand as of May 17, 2004 according to the WHO. Regarding the first outbreak of recent Asian HPAI, it has been suspected that some Asian countries with the exception of Korea and Japan veiled the fact of HPAI outbreaks since the last half of 2003, even though it was first reported in Korea. There have been total nineteen outbreaks of HPAI among chicken and duck farms in 10 provinces in Korea since Dec. 2003 and approximately 5,280,000 birds were slaughtered from 392 farms for eradication of the disease and preemptive culling. The origin of the H5Nl HPAI virus introduced into the country are unknown and still under epidemiological investigation. Current status of outbreaks and characteristics of HPAI will be reviewed and discussed on the basis of genetic, virological, clinicopathological, and ecological aspect, as well as future measures for surveillance and prevention of the disease in Korea.
김재홍,하영국,박천수,장민수,이미경,윤여훈,손주찬,Kim, J.H.,Ha, Y.G.,Park, C.S.,Jang, M.S.,Lee, M.K.,Yoon, Y.H.,Sohn, J.C. 한국전자통신연구원 2005 전자통신동향분석 Vol.20 No.2
로봇 지능은 다양하게 해석될 수 있으며 해석에 따라 다른 요소기술들을 포함하게 된다. 본 고에서는 '사용자의 명령과 주어진 상황을 이해하여 수행할 서비스 목표를 설정하고 이를 달성하기 위한 일련의 작업들을 계획'하는 데 필요한 지적 능력을 로봇 지능으로 정의한다. 이와 같은 로봇의 지능적 서비스 수행 능력을 실현하기 위한 기본적인 요소 기술에는 자연언어 기반의 인간-로봇 인터페이스, 컨텍스트 처리, 서비스 컴포지션 기술이 포함된다. 본 고에서는 이들 요소 기술의 현황과 로봇에의 응용 방향을 살펴본다
충돌에너지흡수능 향상을 위한 알루미늄 크래쉬 박스의 트리거 형상 결정
김재홍,이찬주(C. J. Lee),이선봉(S. B. Lee),김동환(D. H. Kim),김병민(B. M. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
Aluminum crash box, which connects bumper and front side member, is one of components in automotive body to absorb the impact energy. The purpose of this study is to determine the trigger shape of aluminum crash box for improving its impact energy absorption ability. The aluminum crash without trigger has high initial peak load and it causes the collapse of front side member at initial contact with impactor. Therefore, the trigger is required to decrease the initial peak load of aluminum crash box. Three types of trigger shape, such as edge concave, surface convex and concave, were studied to evaluated initial peak load and impact energy absorption by FE-analysis and experiments. The surface concave type trigger shows the best crash performance among the three types of triggers. The aluminum crash box assembled with front side member and the impact test is performed to verify the impact energy absorption ability. The aluminum crash box with surface concave type trigger results no deformation of front side member after impact test.
김재홍,서범수,조재일,최정단,Kim, J.H.,Seo, B.S.,Cho, J.I.,Choi, J.D. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.1
This article presents the future vision and core technologies of the "Life Companion Robot," which is one of the 12 future concepts introduced in the ETRI Technology Roadmap published in November 2020. Assistant robots, care robots, and life support robots were proposed as the development stages of life companion robots. Further, core technologies for each of the ten major roles that must be directly or indirectly performed by life companion robots are introduced. Finally, this article describes in detail three major artificial intelligence technologies for autonomous robots.
양전자 소멸 Auger 전자 에너지 측정을 위한 Time of Flight의 분해도 향상에 관한 이론적 연구
김재홍,양태건,이종용,이병철,Kim, J.H.,Yang, T.K.,Lee, C.Y.,Lee, B.C. 한국진공학회 2008 Applied Science and Convergence Technology Vol.17 No.4
저에너지(수 eV) 양전자 빔을 이용하여 도체나 반도체의 표면/계면의 물리화학적 특성 분석에 독특한 유용성이 보고 되고 있다. 기존의 표면 분석법에 비해 표면의 선택도가 향상되어 반도체 소자의 박막 두께가 얇아지는 최신기술에 적합한 분석법으로 주목을 받고 있다. 물질표면에 조사된 저에너지 양전자는 표면 근처의 image potential에 포획이 되어 표면에 있는 전자들과 쌍소멸하며 Auger 전자를 방출한다. 표면으로부터 방출된 Auger 전자의 에너지를 측정함으로 원자의 화학적 구별이 가능하므로 검출기의 에너지 분해도가 중요하다. 기존의 ExB 형태의 에너지 측정기는 분해도가 $6{\sim}10\;eV$ 정도이고 특정한 에너지 영역만을 일정시간 스캔하여 스펙트럼을 측정하므로 측정시간이 길어진다는 단점이 있다. 반면에 Time-Of-Flight(TOF) 시스템은 방출되는 전자들의 에너지를 동시에 검출하므로 측정시간이 단축되어 측정 효율이 향상된다. 에너지 분해도를 높이기 위해서는 측정하고자 하는 전자의 진행거리를 길게 할수록 좋으나, 공간적 제약을 고려한 reflected TOF 시스템과 retarding tube을 이용한 linear TOF 시스템의 에너지 분해도를 이론적으로 시뮬레이션하였다. Since the presence of the chemical impurities and defect at surfaces and interfaces greatly influence the properties of various semiconductor devices, an unambiguous chemical characterization of the metal and semiconductor surfaces become more important in the view of the miniaturization of the devices toward nano scale. Among the various conventional surface characterization tools, Electron-induced Auger Electron Spectroscopy (EAES), X-ray Photoelectron Spectroscopy (XPS) and Secondary Electron Ion Mass Spectroscopy (SIMS) are being used for the identification of the surface chemical impurities. Recently, a novel surface characterizaion technique, Positron-annihilation induced Auger Electron Spectroscopy (PAES) is introduced to provide a unique method for the analysis of the elemental composition of the top-most atomic layer. In PAES, monoenergetic positron of a few eV are implanted to the surface under study and these positrons become thermalized near the surface. A fraction of the thermalized positron trapped at the surface state annihilate with the neighboring core-level electrons, creating core-hole excitations, which initiate the Auger process with the emission of Auger electrons almost simultaneously with the emission of annihilating gamma-rays. The energy of electrons is generally determined by employing ExB energy selector, which shows a poor resolution of $6{\sim}10eV$. In this paper, time-of-flight system is employed to measure the electrons energy with an enhanced energy resolution. The experimental result is compared with simulation results in the case of both linear (with retarding tube) and reflected TOF systems.
김재홍(J. H. Kim),이춘승(C. S. Lee) 유공압건설기계학회 2012 유공압건설기계학회 학술대회논문집 Vol.2012 No.6
The paper deals with the development of excavator simulator for grading motion by using Multidomain Real Time simulation method. Simulation models have been verified with test data, and the simulator has been evaluated by operators and engineers. This simulator will be used to optimize the design parameter for grading motion.