선택적 금속 전착에 대한 전해질 온도 및 전류밀도 영향분석

박찬규,김성빈,김영국,유봉영,Park, Chan-Kyu,Kim, Sung-Bin,Kim, Young-Kuk,Yoo, Bongyoung 한국표면공학회 2018 한국표면공학회지 Vol.51 No.6

A metal 3D printer has been developed on its own to electrodeposit the localized area. Nozzles were used to selectively laminate the electrolytic plating method. To analyze the factors affecting the deposition, the stack height, thickness and surface roughness were experimentally analyzed according to the current density and the temperature of the electrolyte. Electrolytic temperature and current are electrodeposited when the deposition conditions are dominant over the etching conditions, but the thickness is kept constant. On the contrary, when the etching conditions are dominant, the electrodeposited shape is rather the etched. As a result, the uniformity of surface quality and electrodeposition rate could be improved by conducting experiments under constant conditions of electrolyte temperature and current density.

광분할 반사경이 집적된 단일 광원 기반의 통합형 듀얼 백라이트 유닛

박찬규,이학순,이상신,Park, Chan-Kyu,Lee, Hak-Soon,Lee, Sang-Shin 한국광학회 2008 한국광학회지 Vol.19 No.2

본 논문에서는 단일 광원에 광분할 반사경을 집적하여 휴대폰의 디스플레이부와 키패드부에 동시 적용 가능한 통합형 듀얼 백라이트 유닛을 제안하고 구현하였다. 이 광분할 반사경은 상부 커버와 홈 모양의 하부 기판을 서로 정렬함으로써 구현되며, 반사경 좌우에는 도광판, 확산 쉬트, 프리즘 쉬트로 이루어진 도광 모듈이 연결되어 있다. 하부 기판의 중앙에 위치한 광원에서 방사된 광은 반사경 내부에서 다중 반사를 하면서 진행하고, 도광 모듈에 입사된 후 면광원으로 변환된다. 제작된 듀얼 백라이트 유닛의 측정 결과를 살펴보면, 키패드부에서의 평균 휘도 및 휘도 균일도는 각각 $420\;cd/m^2$와 69%, 디스플레이부에서는 $640\;cd/m^2$와 79%였다. Dual backlight unit incorporating a single light source integrated with a beam splitting reflector was demonstrated, providing a surface light beam for both the keypad and the display section simultaneously. The reflector was realized by aligning a groove substrate with a matching cover, and a light guiding module comprising a stack of light guide panels and prism/diffuser sheets was attached to both sides of the reflector. A light emanating from the light source-placed in the middle of the substrate-undergoes a series of reflections through the reflector to reach the input of the light guiding module. Then it is transformed into a surface light beam, which is used to irradiate the keypad and display sections simultaneously. As for the accomplished dual surface light sources, the measured average luminance and the spatial luminance uniformity were respectively about $420\;cd/m^2$ and 69% for the keypad section, and $640\;cd/m^2$ and 79% for the display section.

대장균 감각수용체에 있어서 단백질 메틸화에 따른 신호전달기능의 변화

박찬규,김성택,Park, Chan-Kyu,Kim, Sung-Taek 생화학분자생물학회 1988 한국생화학회지 Vol.21 No.2

대장균은 당류나 아미노산 등의 화합물에 대한 주화성을 가지며 이를 수행하는 세포내의 자극과 반응 즉 정보전달 기구가 존재한다. 여기에서 핵심적인 역할을 하는 것은 chemosensory transducer라 불리는 감각수용체인데 이는 자극 또는 화학물질의 인지 뿐만 아니라, 신호발생, 감각적응등의 기능을 수행하는 분자적 단위로 알려져 있다. 본 연구에 서는 감각적응의 현상적 변화로서 관찰된 단백질 메틸화의 기능적 인관관계를 밝히기 위한 시도로서, 감각수용체 단백질의 메틸기 수용자리들을 여러 종류의 아미노산으로 치환하고 그에 따른 감각수용체의 신호전달기능의 변화를 메틸화의 수식기능이 결여된 돌연변이주내에서 관찰하였다. 돌연변이에 따른 세균의 행동 변화는 Sun workstation을 이용한 motion analysis package에 의해 분석하였다. 그 결과 감각 수용체는 메틸화의 증가에 따라 역으로 흥분된 상태에 이르며 메틸기가 전혀 존재하지 않을때에는 계속적인 흥분상태를 유지함이 관찰되었다. 그러나 포화수준의 자극이 존재할때는 메틸화의 정도에 무관하게 막수용체의 흥분이 가능하였다. 이는 메틸화에 따른 단백질의 수식기능이 정상적인 막수용체의 신호전달상태를 결정 하나, 자극에 따른 수용체자체의 흥분성 conformation 변화에는 영향을 미치지 않는 결과로 생각된다. The Trg protein is one of a family of chemosensory receptors that gain or lose methyl esters on specific glutamyl residues during sensory adaptations in Escherichia coli. In this study, we have characterized some of the mutations of Trg created in vitro by site-directed mutagenesis. The mutations have changes in methylation sites such that all possible methyl-accepting residues, either glutamate or glutamine, are replaced by glutamate, glutamine, or alanine only. Behavioral analysis for the cells containing mutated Trg using computerized motion analysis package revealed that those mutations exhibited altered signalling properties compared to the wild type. All glutamate-replaced mutant Trg showed exclusively counterclockwise (CCW)-bias of flagellar rotation in modification-deficient ($cheR^-$ $cheB^-$) host while glutamine or alanine ones exhibited significant clockwise (CW)-bias. It was also demonstrated that Gin or Ala mutations were excitable upon stimulation with attractant ribose. Moreover, the excited state persisted after prolonged stimulation. This results imply that the methylation set the level of signalling output of the transducer. In addition, the complete lack of the methylation shown in Ala mutation did not abolish the excitatory signalling of the transducer. Therefore, it is likely that the methylation operates as a fine-tuning device for the transducer to adjust the level of signalling output while the adaptational feedback requires an additional modulator, possibly a Che protein.

복굴절 특성을 갖는 액정 렌즈어레이를 이용한 깊이감이 향상된 집적영상 시스템

박찬규,황용석,이상신,Park, Chan-Kyu,Hwang, Yong-Seok,Lee, Sang-Shin 한국광학회 2008 한국광학회지 Vol.19 No.6

본 논문에서는 집적영상의 문제점인 깊이감 제한 문제를 해결하기 위해서 편광된 광과 복굴절 매질인 액정 렌즈어레이를 이용한 집적영상 시스템을 제안하고 구현하였다. 제안된 렌즈어레이는 두 개의 유리 렌즈어레이 위에 서로 다른 ZLI-4119와 E-7 액정을 증착하여 구현하였다. 액정은 편광 방향에 따라서 굴절률이 서로 다르기 때문에 두 개의 중심깊이 평면을 얻을 수 있다. 이로 인하여 초점 영역의 변화를 얻을 수 있으며 이로 인해 복원 시 깊이감을 향상시킬 수 있다. $LightTools^{(R)}$ 프로그램을 이용하여 집적영상 시스템을 구현하였고, 굴절률 차에 의한 초점거리 변화를 확인하였다. 액정 디스플레이 공정을 이용하여 소자를 제작하였고, 광학 실험을 통하여 초점거리의 변화를 측정하였다. ZLI-4119 액정 렌즈어레이의 굴절률은 기본 렌즈어레이의 굴절률보다 작기 때문에 실상이 맺히게 되고, 초점거리는 약 680 mm였다. 반면에 E-7 액정 렌즈어레이의 경우에는 허상이 맺히게 되고, 이론적인 초점거리는 -29 mm였다. An integral imaging system enabling enhanced depth of field by incorporating a pair of liquid-crystal (LC) lens arrays was proposed and demonstrated. The lens arrays exhibit two different refractive indexes depending on the light polarization. The proposed LC lens array I and II were implemented by depositing a ZLI-4119 LC and an E-7 LC, respectively, on top of a lens-array substrate in glass. When the two LC lens arrays were aligned appropriately, a birefringence was obtained for a specific light polarization in such a way that the incoming light sees different refractive indexes for them. As a result, the focal length associated with the imaging system utilizing the LC lens arrays was adaptively varied, thereby enhancing the depth of field for the image reconstruction. We have theoretically analyzed the proposed integral imaging system with the $LightTools^{(R)}$ to confirm that the focal length could be adjusted with the help of the birefringent lens array. Finally the proposed imaging system successfully reconstructed the objects. The birefringent lens array employing the ZLI-4119 LC produced a real image with the focal length of 680 mm, while the other using the E-7 LC yielded a virtual image with the focal length of -29 mm.

대장균 감각수용체에 있어서 단백질 메틸화에 따른 신호전달기능의 변화

박찬규,김성택 ( Chan Kyu Park,Sung Taek Kim ) 생화학분자생물학회 1988 BMB Reports Vol.21 No.2

The Trg protein is one of a family of chemosensory receptors that gain or lose methyl esters on specific glutamyl residues during sensory adaptations in Escherichia coli. In this study, we have characterized some of the mutations of Trg created in vitro by site-directed mutagenesis. The mutations have changes in methylation sites such that all possible methyl-accepting residues, either glutamate or glutamine, are replaced by glutamate, glutamine, or alanine only. Behavioral analysis for the cells containing mutated Trg using computerized motion analysis package revealed that those mutations exhibited altered signalling properties compared to the wild type. All glutamate-replaced mutant Trg showed exclusively counterclockwise (CCW)-bias of flagellar rotation in modification-deficient (cheR^- cheB^-) host while glutamine or alanine ones exhibited significant clockwise (CW)-bias. It was also demonstrated that Gln or Ala mutations were excitable upon stimulation with attractant ribose. Moreover, the excited state persisted after prolonged stimulation. This results imply that the methylation set the level of signalling output of the transducer. In addition, the complete lack of the methylation shown in Ala mutation did not abolish the excitatory signalling of the transducer. Therefore, it is likely that the methylation operates as a fine-tuning device for the transducer to adjust the level of signalling output while the adaptational feedback requires an additional modulator, possibly a Che protein.

노후 아파트 주차장 확충방안에 관한 고찰

김대중(Kim Dae-Jung),박찬규(Park Chan-Kyu),김형진(Kim Hyung-Jin) 대한건축학회 2012 대한건축학회논문집 Vol.28 No.2

The deteriorated apartments constructed before middle of 1990th is suffering from the lack of parking lots as well as the deteriorated facilities, because of low level of parking standards. The purpose of this study is to analyze the present situation of parking spaces and the user needs in the deteriorated high-rise apartments and to find out the appropriate solution to expand the parking lots. It is identified that the parking lots is definitely lack, that the residents suffer from difficulty of finding parking spaces, inconvenient access of urgent vehicles and insufficient open spaces, and that they have strong needs to improve parking conditions and are willing to spend resonable money expanding parking lots by the case studies of 5 deteriorated high-rise apartments in Deajeon area. The authors calculated the amount of parking lots to supply and the construction cost according to the type of parking lots, and suggested the available solutions of expanding parking lot comparing with residents’ abilities of payment.

띠철근 간격에 따른 고강도 콘크리트 기둥의 내화 성능

박찬규(Park, Chan Kyu),이승훈(Lee, Seung Hoon) 한국콘크리트학회 2008 한국콘크리트학회 학술대회 논문집 Vol.2008 No.5

고온에서의 고강도 콘크리트 비정상상태 변형률

박찬규(Park, Chan Kyu),김규용(Kim, Gyu Yong),이승훈(Lee, Seung Hoon),김영선(Kim, Young Sun) 한국콘크리트학회 2007 한국콘크리트학회 학술대회 논문집 Vol.2007 No.5

실리카흄 콘크리트의 감쇠 특성

박찬규(Park, Chan Kyu),유영기(Lew, Young Kee),문영종(Moon, Yeong Jong),노재호(Noh, Jae Ho),권승희(Kwon, Seung Hee) 한국콘크리트학회 2019 한국콘크리트학회 학술대회 논문집 Vol.31 No.1

콘크리트에서의 휘발성 유기 화합물 방출 특성

박찬규(Park, Chan Kyu),이승훈(Lee, Seung Hoon) 한국콘크리트학회 2007 한국콘크리트학회 학술대회 논문집 Vol.2007 No.11