變斷面 部材의 應力解析

김경찬,장대식 영남이공대학 1972 論文集 Vol.1 No.-

Structural members are frequently given profiles widening toward the endes to enable the members to better resist the negative bending moment prevailing at the joints, and design calculations are usually made on the assumption that they are of uniform section, ignoring the potential effect of variation in sectional demensions. This paper considers the extent of such effect and experimentally definess the limit of the size of some such thickening of sections within which such approximate design procedures may result with sufficient engineering practicability.

초정밀작업을 위한 6자유도 마이크로 스테이지의 개발

김경찬,김수현,곽윤근,Kim, Kyung-Chan,Kim, Soo-Hyun,Kwak, Yoon-Keun 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.2

A new 6 degrees-of-freedom micro stage, based on parallel mechanisms and actuated by using piezoelectric elements, has been developed for the application of micro positioning such as semiconductor manufacturing devices, high precision optical measurement systems, and high accurate machining. The micro stage structure consists of a base platform and an upper platform(stage). The base platform can effectively generates planar motion with yaw motion, while the stage can do vertical motion with roll and pitch motions with respect to the base platform. This separated structure has an advantage of less interference among actuators. The forward and inverse kinematics of the micro stage are discussed. Also, through linearization of kinematic equations about an operating point on the assumption that the configuration of the micro stage remains essentially constant throughout a workspace is performed. To maximize the workspace of the stage relative to fixed frame, an optimal design procedure of geometric parameter is shown. Hardware description and a prototype are presented. The prototype is about 150mm in height and its base platform is approximately 94mm in diameter. The workspace of the prototype is obtained by computer simulation. Kinematic calibration procedure of the micro stage and its results are presented.

농촌융복합산업(6차산업)지구 추진실태 및 개선방안

김경찬,문응규,이상수,구승모,이동근,손용훈 한국농촌계획학회 2017 농촌계획 Vol.23 No.3

This study started with drawing problems of early implementation and suggesting improvement plans in order to lead a rural convergence industrialization district system to early settlement and management for its policy goals. The study aimed at 13 districts that were designated from 2014 to 2016 for analyzing an actual condition of promoting early implementation, and went ahead with it combining literature research, interview survey and specialist opinion investigation. The study examined and organized an outline, policy goal, and actual condition of rural convergence industrialization district. Furthermore, it analyzed an actual condition of promoting at each stage such as designating processes of rural convergence industrialization districts, operating body and system, regulation improvement, district supporting projects and relating projects, drew problems and finally suggested improvement plans. This study could be meaningful because it is the first study to grasp an actual condition of promoting early implementation and to remedy problems in order to manage rural convergence industrialization district system which was newly promoted since 2014 for its policy goal. In addition, it suggests that the further study of the result after managing district system for a certain period of time should be needed.

영상처리에 의한 화염 발광 라디칼의 가시화

김경찬,김영민,정주영,김태권 한국광학회 1998 한국광학회지 Vol.9 No.4

분젠버너에서 당량비에 따른 연료부족, 적정, 과잉의 경우로 예혼합된 프로판-공기 화염에서 발생된 C2, CH, OH 라디칼의 농도형태 측정을 영상처리법을 이용하여 가시화하였다. 영상처리 시스템에서 협대역 통과필터, 영상증폭장치, CCD 및 PC를 사용하여 라디칼의 발광 파장대의 영상을 처리하였다. 영상처리 시스템을 통하여 화염에서 라디칼의 반응영역을 관찰하고, 라디칼의 농도분도를 예측할 수 있었다. 반응영역에서 각각의 라디칼의 공간적 분포는 CmHn 계열 화염의 반응 메카니즘을 이해할 수 있는 충분한 정보를 제공하였다. 이 정보로부터 C2 라디칼의 형광은 반응영역 앞부분에 먼저 나타나며 CH와 OH 라디칼의 형광은 화염의 하류부분에 분포함을 알 수 있었다. The Measurement of concentration patterns for $C_2$, CH and OH radicals in the premixed propane-air flame could be managed through an image processing technique. This technique was applied to the three kinds of flames on a bunsen burner-mixtures of fuel to be lean, optimum and excessive respectively. The image processing system was complished by treating single wavelength flame images around the eac radical luminescence band, which was obtained by using a set of narrow band pass filters, an image intensifier, CCD and PC. It was possible to observe and predict the reaction zone and the concentration distribution of the radicals, Spatial distribution of each radicals in the raaction zone gave us enough informations to analyze the reaction mechanisms in $C_mH_n$ combustion process. According to this informations, the image of $C_2$ radical exists at front zone, following the images of CH and OH radicals at downstream.

포스터 전시 발표 : 순환기, 호흡기 ; 전이성 폐암으로 오인한 결절성 유육종증 1례

김경찬,박순효,박훈표,서용우,한승범,전영준,권건영 대한내과학회 2002 대한내과학회 추계학술대회 Vol.63 No.-

유휴농지 활용유형별 사례 비교 연구

김경찬,정인호,구승모 한국농촌계획학회 2015 농촌계획 Vol.21 No.2

This study made use of 9 types of utilizing idle farmland deducted from existing research in order to examine cases by type of idle farmland, and selected representative cases by type after analyzing contents of 165 available newspaper articles. Selected Cases were assorted into agricultural use and nonagricultural use, and agricultural use are as followed. ①Community Service/Farming type is the case of Gimhae city reported on ‘Busan Ilbo’, ②High Income/Farming type is the case of cooperative unit of Geumjeong crude drug in Yeongam appeared in ‘Newsis’, and the case of Omija industry in Mungyeong reported on ‘Hankyoreh’, ③Tourism/Landscape/Farming type is the case of rape flowers and buckwheat flowers in Gupo village reported on ‘Asia News Agency’, ④Stock Raising/Farming type is the case of growing foraging crops published in ‘The Daejeon Ilbo’, ⑤Weekend farm type is the case of utilizing idle farmlands and creating weekend farm reported on ‘Mediawatch’, ⑥High income/Forest type is creating Mulberry cultivation areas in Hamyang-Gun published in ‘Yonhap News’, ⑦Ecology/Landscape/Forest type is forestation project of idle land reported on ‘Newsis’, ⑧Agricultural Experience Study type is the case of managing agricultural experience study center in Dosun elementary center published in ‘Sisajeju’ and the case of non-agricultural application case, ⑨Ecological Environment type is the case of wetland restoration of idle farmland in Gochang. This study investigated and arranged detailed contents by the literature search and interview investigation according to investigating items such as utilizing area, main agent, purpose, utilizing item, utilizing content, etc. by case. With that, it deducted implications as well as case characteristics, and finally suggested political proposals through the case analysis.

120층 규모 초고층 건물에 대한 횡력저항시스템 적용에 따른 장기거동 분석

김경찬,김재요 한국전산구조공학회 2022 한국전산구조공학회논문집 Vol.35 No.2

It is essential to control the lateral displacement and differential axial shortening of the vertical elements in high-rise buildings. Thedifferential axial shortening can cause challenges in the serviceability and safety of non-structural and structural elements, respectively. Hence,in this study, the differential axial shortening of the vertical elements and effects of long term behaviors of concrete are analyzed in 120-storyhigh-rise buildings via the construction sequence analysis. Consequently, the axial shortening of the vertical elements is classified into elastic,creep, and shrinkage shortening, and dominant factors to the maximum axial shortening are analyzed. In addition, the serviceability of the non-structural elements is checked with a differential axial shortening at 30 years after completion of construction, and member forces at designand construction stages in girders and outrigger walls are compared. 초고층 건물에서 수평변위 제어와 수직부재에서 발생하는 부등축소에 대한 검토가 필수적이다. 이러한 부등축소는 비구조요소의사용성과 구조요소의 안전성에 대해 문제를 야기할 수 있다. 따라서 이 연구에서는 120층 규모의 철근콘크리트 주거용 초고층 건물에대해 시공단계해석을 수행하여 각 수직부재의 부등축소량을 비교하고 콘크리트의 장기거동의 영향을 분석하였다. 이를 위해 영향요인에 따라 축소량을 탄성축소량, 크리프축소량, 건조수축축소량으로 구분하여 검토하였으며 최대 절대축소량에 대한 지배적 요인을분석하였다. 또한, 입주완료 후 30년에서 발생한 부등축소량에 대해 사용성 검토를 진행하였으며, 구조요소에 대해 설계단계와 시공단계의 부재력을 비교하여 분석하였다.

자기-도핑형 poly(PEGMA-co-BF₃LiMA) 전해질의 합성과 이온전도도에 대한 PEGMA분자량의 영향

김경찬,류상욱,Kim, Kyung-Chan,Ryu, Sang-Woog 한국전기화학회 2012 한국전기화학회지 Vol.15 No.4

분자량이 각각 300(PEGMA300) 및 1100(PEGMA1100) g $mol^{-1}$인 PEGMA와 합성된 $BF_3LiMA$ 리튬염을 이용하여 다양한 조성의 고분자전해질을 제조하고 전기화학적 특성을 평가하였다. 흥미롭게도 AC-impedance 측정법에 의한 상온 이온전도도는 분자량 $300g\;mol^{-1}$로 합성된 액체 고분자전해질에서 $8.54{\times}10^{-7}S\;cm^{-1}$의 값이 얻어진 반면, PEGMA1100으로 합성된 고체상태의 고분자전해질에서 최대 14배 이상 높은 $1.22{\times}10^{-5}S\;cm^{-1}$가 관찰되었다. 이러한 결과는 PEGMA에 ethylene oxide 단위가 5개인 $300g\;mol^{-1}$보다 23개인 $1100g\;mol^{-1}$에서 리튬이온의 배위가 쉽게 일어나기 때문으로 해석된다. 또한 양이온 수율 측정결과 리튬메탈과 $BF_3$간의 반응으로 인해 0.6의 비교적 낮은 값이 나왔지만 초기 3000초 동안에는 0.9 이상의 값이 관찰되어 단일이온 전도체의 특징을 보여주었다. Polymer electrolytes consisted of $BF_3LiMA$ and 300 (PEGMA300) or 1100 (PEGMA1100) g $mol^{-1}$ of PEGMA were prepared and the electrochemical properties were characterized. Interestingly, the AC-impedance measurement shows $1.22{\times}10^{-5}S\;cm^{-1}$ of room temperature ionic conductivity from PEGMA1100 based solid polymer electrolytes while $8.54{\times}10^{-7}S\;cm^{-1}$ was observed in PEGMA300 based liquid polymer electrolytes. The more suitable coordination between lithium ion and ethylene oxide (EO) unit might be the reason of higher ionic conductivity which can be possible in PEGMA1100 based electrolytes since it has 23 EO units in monomer. The lithium ion transference number was found to be 0.6 due to the side reactions between $BF_3$ and lithium metal expecially for longer time but 0.9 was observed within 3000 seconds of measuring time which is strong evidence of a single-ion conductor.

지역문화시설의 기능 및 규모에 관한 연구

김경찬,강건희 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.1

The purpose of this study was to set up the function and the size of the local cultural arty facilities. The local cultural arts facilities should functionally lead to the active participation of inhabitants accruing to contemporary demands and special study on managing programme should go ahead of it from the start of design grosses. We've analyzed the sine of it basing on the actual condition of existing facilities.

한・중 수사제도의 비교와 시사점 - 수사제도의 헌법적 근거와 수사권 비교를 중심으로 -

김경찬 대검찰청 2020 형사법의 신동향 Vol.0 No.66

The aim of this thesis is to have implications through the Comparison of the Investigation System of China and Korea. In recent years the Judicial Reform of Korea and China have been under way especially about the response of corruption crime. China established National Inspection Committee for the investigation about the corruption of the Government Officials, it progressed quickly through the discussion among the organizations concerns like the Prosecution, Police, National Inspection Committee and the National People’s Congress. The Investigation System of China has been affected from the establishment of National Inspection Committee about the range of investigation of the prosecution. Korea have plan to establish the Office for criminal investigation about the senior government official for response to the Corruption Offense after a long consultation between the ruling party and some minor parties. The adjustment of investigation rights between Police and Prosecution in Korea has been made in spite of much argument, the investigation system and ways of the adjustment of investigation rights of China can be a useful example and reference in Korea as below despite the difference of political system. First, the termination the investigation of police in China should have the convincing proof and the obviousness of the crime. The second, the Prosecutor can ask to Police the explanation of the lawfulness of the proof and supplemental investigation for two times only. The third, the Prosecution can investigate the corruption offense elastically after the investigation of National Inspection Committee in China. The forth, Police can ask reconsideration about the decision of the non-prosecution of the prosecution. The fifth, the victim can accuse personally to the court in case of the decision of non-prosecution of prosecution etc. 사법개혁은 많은 국가에서 국민들의 커다란 관심과 논의의 대상이 된다. 한국과 중국 역시 최근 검찰, 경찰(공안), 고위공직자범죄수사처(감찰위원회)를 중심으로 수사권의 권한분배와 조정이 뜨거운 논의를 불러일으켰으며 제도적 개혁이 함께 진행되었다. 한국과 중국은 각각 정치적 구조와 이념적 지향, 시민적 참여가 다르기에 헌법을 포함한 제도적 구성방식이 차이를 보일 수밖에 없는 것도 사실이다. 그럼에도 불구하고 국민의 기본권에 직・간접적으로 커다란 영향을 줄 수 있는 수사제도는 범죄수사의 효율성도 중요하지만 국민의 인권침해 방지를 위해 다양한 차원의 통제와 검증이 필요하며 동시에 범죄의 발생과 억제가 실질적이고 효과적으로 이루어질 수 있도록 구성하는 것이 요청된다. 한국과 중국의 수사제도와 관련하여 헌법적 규정사항에서부터 각 기관의 권한범위와 상호통제 및 협력사항을 살펴보고 국가 수사기관 사이의 권력분배 뿐만 아니라 국민의 효율적 감시방안에 대해서도 함께 제시해 본다.