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최지훈,이존자,김수보,이용재,Choi, Jee-Hoon,Lee, Jon-Ja,Kim, Su-Bo,Lee, Yong-Jae 한국강구조학회 2000 韓國鋼構造學會 論文集 Vol.12 No.5
In this study, vertical dynamic analyses on the suspension bridges under seismic load are developed. Time domain analysis, random vibration analysis, and spectral analysis are formulated theoretically. The random nitration analysis is checked by numerical integration and the mathematical integration with correlation coefficient which include CQC and SRSS method in the conditions of white noise and filtered white noise. Beam, truss and frame elements are used in order to model the suspension bridge. Geometric stiffness due to dead load is considered for cable and tower. 본 연구는 지진하중을 받는 현수교의 수직 동적 해석방법을 발전시켰다. 시간 영역해석, 불규칙 진동 해석 및 스펙트럼 해석의 이론을 체계적으로 정립하였다. 불규칙 진동 해석을 다시 수치적분을 이용하는 방법과 수학적 적분식 및 상관계수를 이용한 방법으로 나누고 각각은 다시 지진하중을 white noise로 가정한 경우와 filtered white noise로 가정한 경우에 대해 CQC 방법과 SRSS 방법을 사용하였다. 현수교의 모델링은 빔, 트러스 및 프레임요소를 사용하였고 케이블과 주탑은 사하중에 의한 기하학적 강성을 고려하였다.
최지훈,강신천,김준,심성대,지태영,송재복,Choi, Ji-Hoon,Kang, Sin-Cheon,Kim, Jun,Shim, Sung-Dae,Jee, Tae-Yong,Song, Jae-Bok 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.3
Unmanned ground vehicles may be operated by remote control unit through the wireless communication or autonomously. However, the autonomous technology is still challenging and not perfectly developed. For some reason or other, the wireless communication is not always available. If wireless communication is abruptly disconnected, the UGV will be nothing but a lump of junk. What was worse, the UGV can be captured by enemy. This paper suggests a method, autonomous return technology with which the UGV can autonomously go back to a safer position along the reverse path. The suggested autonomous return technology for UGV is based on multi-correlated information based DB creation and matching. While SUGV moves by remote-control, the multi-correlated information based DB is created with the multi-sensor information; the absolute position of the trajectory is stored in DB if GPS is available and the hybrid MAP based on the fusion of VISION and LADAR is stored with the corresponding relative position if GPS is unavailable. In multi-correlated information based autonomous return, SUGV returns autonomously based on DB; SUGV returns along the trajectory based on GPS-based absolute position if GPS is available. Otherwise, the current position of SUGV is first estimated by the relative position using multi-sensor fusion followed by the matching between the query and DB. Then, the return path is created in MAP and SUGV returns automatically based on the MAP. Experimental results on the pre-built trajectory show the possibility of the successful autonomous return.
최지훈(Jee-Hoon Choi),노성남(Sung-Nam Noh),김은주(Eun-Ju Kim),김선정(Sun-Jeong Kim),송창근(Chang-Geun Song) 한국멀티미디어학회 2010 한국멀티미디어학회 학술발표논문집 Vol.2010 No.2
스마트폰은 GPS, 가속도센서 등의 다양한 센서들을 추가하여 사용자와의 인터렉티브한 시스템 환경을 제공하며 이런 센서들을 이용한 스마트폰 전용 게임들이 개발 되고 있다. 또한 최근에는 아이폰4에 자이로센서가 탑재되었다. 본 논문에서는 이러한 스마트폰의 센서를 이용하여 PC게임과 접합 시키는 시스템을 제안한다.
A Study on the Manufacturing Technology for the Development of Heat Pipes with a Sintered Metal Wick
Jee-Hoon Choi(최지훈),Sung-Dae Kim(김성대),Byung-Ho Sung(성병호),Seong-Ryou Roo(유성열),Hyung Ki Park(박형기),Chul-ju Kim(김철주),Han Seo Ko(고한서) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The most the electronic industry has recently accelerated the modularization, the miniaturization and the high integrated trend of electronics fields such as electronics components, appliances and etc., the most increasingly the heat generation problem rises. Even though the conventional cooling technologies are widely used in order to reduce the heat loads, the technologies are not easy to meet the present trends due to the fact that most of many conventional methods are relative to external form environments such as size, design and so on. With regardless of those environments, however, a heat pipe is one of the most efficient systems to improve the heat transfer performance. And then the performance of the heat pipe depends on a wick structure. Of various wick structures, sintered metal wick is known so that it has some advantages such as smaller pore size, increasing porosity as well as high reliability. In this study sintered metal wicks, thickness 0.7 ㎜, 0.8 ㎜ and 0.9 ㎜, were manufactured as of 100㎛ copper powder to obtain the manufacturing technology of heat pipes mounted with a sintered metal wick. Furthermore, experiments for the operational performance factors such as capillary limit, thermal resistance were not only performed but also compared with a theoretical model simultaneously. Experimental results agreed with the theoretical model, and then it seems to be required to study various development processes of sintered metal wicks for the high performance of a heat pipe system.
히트파이프 열교환기를 이용한 전자통신장비 콘솔의 냉각 기술에 관한 연구
최지훈(Jee-Hoon Choi),유성열(Seong-Ryoul Ryoo),성병호(Byung-Ho Sung),이정환(Jung-Hwan Lee),김종만(Jong-Man Kim),전지환(Ji-Hwan Chun),서명원(Myung-Won Suh),김철주(Chul-ju Kim) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The fan is widely used to cool high heat flux generated as of the electronic communication device consoles. It, however, makes a lot of noises that interfere considerably with the operation environment. This study was conducted to obtain the cooling design technology of the consoles through being equipped with the Heat Pipe Heat Exchangers (HPHE) together with low revolution fans in place of existing fans for the cooling technology of the forced convection. Not only the sealed type consoles but the HPHE were also designed so as to cool effectively the heat generated from the inside of the console. The simulation was conducted by computational numerical analysis along with its experiments. The results of the numerical analysis and experiments were compared in order to improve the cooling technology of the consoles mounted with the HPHE. Consequently, instead of loud fan noise generated as of existing forced convection methods, the cooling technology of HPHE can remarkably improve many problems such as the operation environment, indoor dust, malfunction caused by pollution sources and so on.
랭거아치교의 라이즈-경간-형고의 최적관계를 위한 정적 및 동적해석
허은미,최지훈,조병칠,이용재,Hur, Eun Mi,Choi, Jee Hoon,Cho, Byoung Chil,Lee, Young Jae 한국강구조학회 2002 韓國鋼構造學會 論文集 Vol.14 No.2
강재의 고강도화 및 경량화가 실현되고, 해석기법이 발달함에 따라 장경간을 갖는 강아치교의 건설이 가능하게 되었다. 장경간 아치교를 설계하기 위해서 경제적으로는 재료를 최소화시키며 구조적으로는 안전해야 한다. 이에 본 연구의 목적은 최적설계를 위한 형고의 높이를 제시하고 강재량에 영향을 주는 라이즈-경간비에 대해서 우리나라 활하중을 재하하여 검토하였다. 또한 구조적 안전성을 검토하기 위해 지진에 대한 동적거동을 비교 연구하였다. 라이즈-ㄱ경간-형고에 대한 관계식은 60, 70, 80, 90, 100m의 5개 기본경간을 SAP2000 프로그램을 이용하여 값을 산출하고 회귀분석을 통하여 관계식을 얻었다. 그리고 지진에 대한 동적 거동을 파악하기 위해 포트받침과 탄성받침을 사용했을때 교각형태, 교각높이 및 라이즈-경간비등을 변화시켜 교축방향과 교축직각방향에 대한 단면력을 확인하였다. Development of high-strength and light-weight structural steel as well as advancement in steel structure analysis enable construction of long span steel arch bridge. In an economic viewpoint, however, the design values of long span steel arch bridge needs to be optimized to reduce construction cost and achieve proper levels of structural safety. This study investigated the girder depth and the rise-span ratio for optimum design values, as well as the spectral analysis for protection against earthquake. The relationship between rise-span ratio and girder depth was derived based on the parametric studies of the basic span lengths of 60, 70, 80, 90, and 100m using a commercial Cis SAP2000. The equation relating the two variables was derived using linear regression.
성병호(Byung-Ho Sung),최지훈(Jee-Hoon Choi),유성렬(Seong-Ryul Ryu),김철주(Chul-Ju Kim) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
The present study was conducted to test whether a secondary wick could keep the liquid flow from vapor intrusion into the liquid line, resulting the failure of liquid flow into the evaporator when it occurred the liquid compensator dry out for an LHP without a secondary wick. Experimentally it was seen that a secondary wick could resolve the operational failure due to the liquid chamber dry out within the limit of its maximum capillary pressure. Calculating the allowable temperature rise of the liquid compensator wall above the liquid line temperature showed that it decreased exponentially with liquid line temperature, ranging from 19 ℃ to 4 ℃ when the liquid temperature increased from 20 ℃ to 60℃.
이창행(Chang Haeng Lee),최지훈(Jee Hoon Choi),백승국(Seung Kuk Baek),우정수(Jeong Su Woo),정광윤(Kwang-Yoon Jung) 대한두경부종양학회 2003 대한두경부 종양학회지 Vol.19 No.1
Out of entire salivary tumor, 1.7% are malignant lymphoma developed in salivary gland and it is usually mucosa associated lymphoid tissue (MALT) lymphoma developed in salivary gland. In the case of Non-Hodgkin lymphoma, the most frequently involved extanodal sites of diffuse large B cell lymphoma are bone, skin, thyroid, gastrointestinal tract, and lung. Development in salivary gland is very rare. A 69 years old male patient who have found Lt. submandibular gland (SMG) mass a month ago is suspected of malignancy from his FNA result, so histologic exam by SMG resection was operated. According to histopathologic exam, large B cell lymphocyte infiltratration were generally shown as diffuse and lymphoepitheliallesion were not found. In immunostaining, CD79a showed positive and CD3, CAM5.2 showed negative which diagnosed as diffuse large B cell lymphoma. As Ann Arbor stage I, CEOP-B chemotherapy was used 3 times as treatment without any recurrence. In the case of malignant lymphoma in salivary gland, it develops as painless mass in ipsilateral side. If found in parotid gland, it is rare to have facial nerve falsy and pathologically diagnosed as lymphocytes of abnormal type of monoclonal immunostaining must be provided as evidence. Combined therapy is known as most effective treatment for intermediate grade.
단일벽 탄소 나노튜브(SWNT) 강화 구리 복합체의 제조 및 기계적 특성에 관한 연구
성병호(Byung-ho Sung),오세영(Seyoung Oh),최지훈(Jee-hoon Choi),심언태(Untae Sim),김범준(Bumjoon Kim),백승현(Seunghyun Baik),임병수(Byengsoo Lim),김철주(Chul-ju Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Carbon nanotubes were coated by nickel to increase interfacial bonding on copper matrix materials. Mixing processes of ultrasonicating single-walled carbon nanotubes and copper powders were carried out in ethanol to obtain the uniform composition of specimens. The nanocomposite materials were fabricated by sintering processes, which consists of mixing carbon nanotubes with matrix powders followed by hot-pressing. The mechanical properties of single walled carbon nanotube reinforced copper matrix nanocomposite materials have been investigated by SP-creep test and wear test. The displacement rate of nickel-coated nanotube-copper composite was found to increase at 200℃ when compared with pure copper or other nanocomposite materials. The incorporation of carbon nanotubes and nickel-coated carbon nanotubes in the copper matrix composites decreased friction coefficients and increased times up to the onset point of scuffing, compared with those of pure copper specimens.