기능적 자기공명영상의 임상적 실용화를 위한 기술개선

이경민,이수화,김채연,김나영,장기현,노재규,이경민 대한신경과학회 1999 대한신경과학회지 Vol.17 No.2

자동차용 박강판 겹치기 이음부의 CO₂ 아크 용접에서 다중회귀분석기법을 이용한 용입깊이 예측에 대한 연구

이경민,심현우,권재형,윤북동,정민기,박문수,이보영,Lee, Kyung-Min,Sim, Hyun-Woo,Kwon, Jae-Hyung,Yoon, Buk-Dong,Jeong, Min-Ki,Park, Moon-Soo,Lee, Bo-Young 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.2

Welding is an essential process in the automotive industry. Most welding processes that are used for auto body are spot welding and $CO_2$ welding are used in a small part. In production field, $CO_2$ welding process is decreased and spot welding process is increased due to welding quality is poor and defects are occurred in $CO_2$ welding process frequently. But $CO_2$ welding process should be used at robot interference parts and closed parts where spot welding couldn't. Because of the 0.65mm ~ 2.0mm thickness steel sheet were used in the automotive industry, poor quality of welding area such as burn through and under fill were happened frequently in $CO_2$ process. In this paper, we will study about the penetration depth which gives a huge impact on burn through changing a degree of base metal, welding position and torch angle. Voltage, current and welding speed were fixed but degree of base metal, welding position and torch angle were changed. And Cold- Rolled(CR) steel sheet was used. Penetration depth was analysed by multiple regression analysis to derive approximate calculations. And reliability of approximate calculations were confirmed through additional experiments. As the results of this research, we confirmed the effect of torch and plate angle to bead shape. And we present a possibility that can simulate more accurate to weld geometry, as deduced the verification equations that has tolerance of less than 21.69%.

선상 2축 감시 장비의 안정화를 위한 하드웨어 포함 시뮬레이션

이경민,조재현,유준 제어로봇시스템학회 2011 제어로봇시스템학회 각 지부별 자료집 Vol.2011 No.12

This paper presents a realization of kinematic and image stabilization of the pan-tilt surveillance system on shipboard via simulations including the actual apparatus and 6-dof motion simulator. From HIL(Hardware In the Loop) simulation results, it has been shown that the overall stabilization scheme is effective enough.

Affinity Characteristic of Terminal Sequence in Vancomycin Resistant Enterococcus (VRE) Membrane Peptides on Nanobiosensor Chip Using Localized Surface Plasmon Resonance

이경민,김요한,정헌상,이현호 한국바이오칩학회 2017 BioChip Journal Vol.11 No.2

In this study, specific binding affinity between vancomycin (VAN) conjugated 40-50 nm gold nanoparticles (Au NPs) implemented on a sensor chip and pentapeptide mimicking pathogenic VAN resistant Enterococcus (VRE) wall membrane was employed as nanosensor format based on localized surface plasmon resonance (LSPR). Two pentapeptides, which were also anchored to 5 nm Au NPs, having two different terminal sequences of d-Ala-d-Ala and d-Ala-d-Lac respectively were compared in specific binding affinity toward the VAN conjugated nanosensor. Binding affinity difference identified by the LSPR characteristic in the nanosensor was shown in absorbance intensity and absorption wavelength shift between the two different terminal pentapeptides. The absorbance intensity clearly indicated that the pentapeptide having terminal d-Ala-d-Lac showed less affinity toward VAN conjugated nanosensor chip than that having terminal d-Alad- Ala. It indicates that the VRE itself has relatively weak binding strength towards the VAN, which may be used as a probe molecule for the VRE. Therefore, in order to design a VRE sensor using the VAN affinity, an indirect LSPR method can be devised instead of direct LSPR method.

차체 플러그 용접품질에 영향을 미치는 아크 위치에 대한 실험적 기초 연구

이경민,김재성,이보영,Lee, Kyung-Min,Kim, Jae-Seong,Lee, Bo-Young 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.3

Welding is an essential process in the automotive industry. Most welding processes that are used for auto body is spot welding. And $CO_2$ arc welding is used in a small part. In production field, $CO_2$ arc welding process is decreased and spot welding process is increased due to welding quality is poor and defects are occurred in $CO_2$ arc welding process frequently. But $CO_2$ arc welding process should be used at robot interference parts and closed parts where spot welding couldn't. $CO_2$ welding is divided into lap welding and plug arc spot welding. In case of plug arc spot welding, burn through and under fill were caused in various welding environment such as different thickness combinations of base metal, teaching point, over the two steps welding and inconsistent voltage/current. It makes some problem like poor quality of welding area and decrease the productivity. In this study, we will evaluate the effect of teaching point through the weld pool behavior and bead geometry in the arc spot welding at the plut hole. Welding position is horizontal position. And galvanized steel sheet of 2.0mm thickness that has plug hole of 6mm diameter was used. Teaching point was changed by center, top, bottom, left and right of the plug hole. At each condition, the phenomenon of weld pool behavior was confirmed using a high-speed camera. As the result, we find the center of plug hole is the most optimal teaching point. In the other teaching point, under fill was occurred at the plug hole. This phenomenon is caused by gravity and surface tension. For performance of arc spot welding at the plug hole, the teaching condition should be controlled at a center of plug hole.

시판 단청용 천연안료의 내광성ㆍ내공해성 실험 연구 - 한국, 일본, 중국 생산 안료를 중심으로 -

이경민,김순관,배수빈,김미정 한국문화재보존과학회 2015 보존과학회지 Vol.31 No.4

국내에서 구입 가능한 국내산, 일본산, 중국산 천연안료를 대상으로 단청 재료로서의 안정성을 확인하고자내광성 및 내공해성 실험을 실시하였다. 본 연구에서는 단청 기법이나 바탕재의 영향을 배제한 채, 안료의 고유한 특성을확인하고자 하였다. 안료 칠을 위한 교착제로는 천연재료인 아교와 현재 단청 공사 시 널리 사용되는 합성수지를 선택하였으며, 열화 실험용 인공 광원은 제논 아크 램프를, 오염 가스로는 이산화질소 가스를 선정하였다. 안료가 열화 된 정도는 색도를 측정하여 변화 정도를 비교하였다. 내광성 실험 결과, 광물성 안료 중 청색, 녹색계열의 안료와 황토, 백토, 석간주 등 토양성 안료들이 내광성이 양호하게 나타났고, 자황, 웅황, 진사, 연단 등이 좋지 않게 확인됐다. 내공해성실험 결과, 연단을 제외한 천연안료 대부분의 내공해성이 양호한 것으로 나타났으며, 전반적으로 합성수지로 칠했을때 보다 아교로 칠 했을 경우 내공해성이 더 양호했다. To verifying the stability of Natural pigments for Dancheong which is available on the market was carried out as light resistance and gas corrosion test. In this particular case, we will confirm the characteristics of the only pigments except of Dancheong technique and influence of substance. Medium using for coloring are animal glue and synthetic resin that widely used for Dancheong in currently. Selected to artificial light source is a xenon arc lamp, contaminated gas is nitrogen dioxide gas in experiment. Degree of degradation of pigment were compared by measuring the degree of color change. The result of light resistance test, mineral pigments were good; color is green and blue type, soil pigments also good; color is yellow ocher, white clay, red clay etc. Gamboge, unghwang, cinnabar, red lead were confirmed not good. The result of gas corrosion test, most of the natural pigments were good condition except the red lead. Generally, animal glue samples had better than a synthetic resin samples.

발전기 보호 및 제어의 신뢰도 기준 개발을 위한 조사 분석

이경민,최순철,박유영,이복구,박철원 대한전기학회 2015 대한전기학회 학술대회 논문집 Vol.2015 No.10

변압기의 모델링에 관한 연구

이경민,김세영,이승윤,박유영,박철원 대한전기학회 2015 대한전기학회 학술대회 논문집 Vol.2015 No.10

사찰벽화 보존실태 조사연구 - 충청도 지역 사찰벽화를 중심으로 -

이경민 한국전통문화대학교 한국전통문화연구소 2011 한국전통문화연구 Vol.9 No.-

본 연구는 충청지역에 사찰 중 공주 마곡사, 논산 쌍계사, 청원 월리사를 대상으로 주요 건축물 내 벽화의 손상상 태 및 보존 환경을 조사함으로써 벽화의 보존실태를 고찰해 보고자 하였다. 환경조사를 위해 온·습도 및 자외선량, 조도량을 측정하였고. 육안조사 및 현미경관찰로 물리적 손상상태를 조사 및 기록하였다. 또한 채색층 색도를 측정 하여 명도 및 채도의 비교를 통해 광학적 손상상태를 분석 하였다. 온·습도 환경은 건물 내부가 고습하고 내·외 부의 온도 편차가 심한 환경으로 조사되었으며 특히 마곡사 대광보전의 경우 외부 벽화에 대한 자외선 및 조도량이 과다하여 전반적으로 벽화에 직·간접적인 손상이 발생할 것으로 판단되었다. 손상상태 조사 결과 벽화의 여러 손 상 유형 중 균열, 박리·박락 및 안료의 변·퇴색 손상이 가장 많이 발생하였고, 색도 측정 결과 북측면 벽화의 손 상이 동, 서측면 벽화에 비해 좀 더 심한 것으로 나타났다. 금번 조사를 통해 현재 국내의 다수의 비지정 벽화 문화 재 보존 실태가 좋지 않다는 것을 확인할 수 있었다. 향후 벽화 문화재 보존을 위해서는 이러한 기초 조사에 대한 체계적이고 통일적인 국내 기준을 마련하여 지속적으로 수행되어야 할 것으로 사료된다. 금번 조사 결과 조사대상 사찰벽화의 보존실태가 양호하지 못한 결과를 확인 할 수 있었으며, 이는 향후 국내 다 수의 사찰벽화 문화재의 보존을 위해서 이러한 기초 조사에 대한 체계적인 기준을 마련하고 관련 연구가 지속적으 로 수행되어야 할 것으로 사료된다. In the past, there was little awareness of the fact that Buddhist Mural paintings are artefacts for conservation and management in Korea. At present, it was incomplete that understanding the current state and investigating condition of Buddhist Mural painting's conservation. Therefore, this study discussed the problem and conservation plan for a long-range conservation of Buddhist Mural painting. They carried out some research into conservation environment Buddhist Mural paintings in Magoksa, Ssanggyesa, Wollisa out of Chungcheongdo's Temples The item of investigation about conservation environment is deterioration main factor: temperature, relative humidity, light. And it measured Thermo-humidity change for internal and external space environment in Temple and illuminance and ultraviolet for outside mural painting during a day. The method of investigating murals' condition was macrography and micrography by portable microscope and naked eyes. Damage type recorded to diagram and measuring the degree of damage by grouping. Also, it measured chromaticity and analyzed the pigments condition by comparison with brightness and chroma. The conservation environments for Buddhist Murals was high humidity and variable thermo-humidity deviation in internal-external space. It is too much ultraviolet and illuminance for outside Murals. Overall, its environment bring about deterioration of murals to direct or indirect. Most Buddhist mural paintings have a lot of cracks, exfoliations, discoloration. According to this result, northern murals are deteriorated than easthern and westhern murals. It is verified that most Buddhist mural paintings were in bad condition. Buddhist mural painting needed to more research into a field conservation plan on the basis of this result.

Synthesis of branched polystyrene with equal chain length between branch points

이경민,유영창,기보람,육지호 한국고분자학회 2010 한국고분자학회 학술대회 연구논문 초록집 Vol.2010 No.4