분자 동역학 기법을 활용한 펩타이드-그래핀 멤브레인의 분석

최문기(Moon-ki Choi),이창선(Chang Seon Lee),김현기(Hyunki Kim),강석준(Seok Jun Kang),이윤정(Yun Jung Lee),김문기(Moon Ki Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.4

Understanding carbon nanotube channel formation in the lipid membrane

Choi, Moon-ki,Kim, Hyunki,Lee, Byung Ho,Kim, Teayeop,Rho, Junsuk,Kim, Moon Ki,Kim, Kyunghoon IOP Pub 2018 Nanotechnology Vol.29 No.11

<P>Carbon nanotubes (CNTs) have been considered a prominent nano-channel in cell membranes because of their prominent ion-conductance and ion-selectivity, offering agents for a biomimetic channel platform. Using a coarse-grained molecular dynamics simulation, we clarify a construction mechanism of vertical CNT nano-channels in a lipid membrane for a long period, which has been difficult to observe in previous CNT-lipid interaction simulations. The result shows that both the lipid coating density and length of CNT affect the suitable fabrication condition for a vertical and stable CNT channel. Also, simulation elucidated that a lipid coating on the surface of the CNT prevents the CNT from burrowing into the lipid membrane and the vertical channel is stabilized by the repulsion force between the lipids in the coating and membrane. Our study provides an essential understanding of how CNTs can form stable and vertical channels in the membrane, which is important for designing new types of artificial channels as biosensors for bio-fluidic studies.</P>

지질로 감싼 탄소 나노튜브의 지질막에서의 수직 나노채널 형성에 대한 분자동역학적 해석

김현기(Kim Hyunki),최문기(Choi Moon-Ki),김영진(Kim Youngjin),김경훈(Kim Kyunghoon),최재붕(Choi Jae-boong),김문기(Kim Moon Ki) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12

Euclidean Cluster Detect 기반 객체 인식 환경 구성 및 분석

성현기(Hyunki Seong),김현지(Hyungi Kim),문상근(Sanggeun Moon),심현철(David Hyunchul Shim) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5

Three-dimensional sensing methodology combining stereo vision and phase-measuring profilometry based on dynamic programming

Lee, Hyunki,Kim, Min Young,Moon, Jeon Il SPIE - International Society for Optical Engineeri 2017 Optical engineering Vol.56 No.12

농업적 활용을 위한 산란일사와 직달일사 관측 자료: 나주에서 2019년 5월부터 2020년 11월까지

김현기 ( Hyunki Kim ),문현동 ( Hyun-dong Moon ),조유나 ( Yuna Cho ),신서호 ( Seo-ho Sin ),김종현 ( Jong-hyeon Kim ),이양원 ( Yang-won Lee ),조재일 ( Jaeil Cho ) 한국농림기상학회 2021 한국농림기상학회지 Vol.23 No.2

농업용 유리온실 또는 플라스틱하우스의 투과율을 산정하거나 영농형 태양광 하부 작물의 수광량을 평가할 때, 그리고 작물 군락 광합성량을 모의하거나 분석할 때에 직달과 산란 일사량을 구분하여 접근할 필요가 있다. 본고에서는 산란과 직달 일사량 자료의 농업적 활용 촉진을 위해 나주에서 2019년 5월부터 2020년 11월까지 측정한 자료를 공개하였다. 또한, 기존 연구에서 9개의 산란계수 추정식을 본 자료로 검증하였다. 추정식들 대부분은 결정계수(R²)가 0.79∼0.80, RMSE가 0.13∼0.15의 범위를 가졌다. 직달·산란 일사량의 농업적 활용을 높이기 위해 본 데이터뿐만 아니라 다양한 자료가 관측되고 공개되어야 할 것이고, 그에 따른 추정식도 정교화될 필요가 있다. Global solar radiation consists of direct and diffuse radiations. Both components are necessary for not only atmospheric science and solar energy domains but also agricultural applications. In this study, the data of direct and diffuse radiations are uploaded to Github. It was observed in Naju during May 2019 to November 2020. Using this data, the previous empirical equations using the relation between clearness index and diffuse ratio were validated. All coefficients of determination (R²) and RMSE were similar as 0.79∼0.80 and 0.13∼0.15. However, to get the lower RMSE, other non-linear approaches will be required with more observation data.

지상 고정형 작물 원격탐사 센서 자료와 표준 생육정보를 융합한 작물 모니터링 기법

김현기 ( Hyunki Kim ),문현동 ( Hyun-dong Moon ),류재현 ( Jae-hyun Ryu ),권동원 ( Dong-won Kwon ),백재경 ( Jae-kyeong Baek ),서명철 ( Myung-chul Seo ),조재일 ( Jaeil Cho ) 대한원격탐사학회 2021 大韓遠隔探査學會誌 Vol.37 No.5

원격탐사 기술을 이용하면 작물의 생육·생리 상태를 비파괴적이고 연속적으로 탐지할 수 있어 그 농업적 활용 가치가 크다. 원격탐사 기반 센서를 농장에 설치하여 스마트팜 시스템에 활용하면, 작물의 이상 여부를 실시간으로 연속해서 감시하여 농업정보(Agro-information)를 생산할 수 있다. 하지만, 작물은 동적으로 변하는 생물이므로, 관측 물리량이 작물의 이상 상태를 나타내는 것인지 생육단계에 따른 생육 변화를 나타내는 것인지 판단하기는 쉽지 않다. 따라서, 작물의 표준 생육정보(Standard growth information) 와 비교한 상대적인 생육을 파악해야 한다. 이상적인 재배관리에서 획득한 작물 생육관련 누적기온인 GDD (Growing Degree Days)와 식생지수의 관계를 표준 생육정보로 두고, 표준 재배관리 시행 논과 무비료처리한 논 각각에서 분광반사측정 센서로 관측된 식생지수(NDVI, Normalized Difference Vegetation Index; CCI, Chlorophyll/Carotenoid Index)와 비교해 작물 상태를 파악했다. 영양생장기 동안에는 생육 정도에 따라 NDVI의 차이가 나타났으며, 식물 스트레스에 따라 CCI가 반응했다. 벼가 익는 동안은 NDVI와 CCI 모두 감소하지만, 표준 생육에서 노화에 따른 그 감소 폭이 더 컸다. 향후 공학적 관측 기법과 농학적 해석 방법을 융합하여 유용한 농업정보를 생산하기 위해 다양한 기후조건과 품종을 대상으로 표준 생육정보 데이터베이스 구축이 필요하겠다. Accordingly, attention is also being paid to the agricultural use of remote sensing technique that non-destructively and continuously detects the growth and physiological status of crops. However, when remote sensing techniques are used for crop monitoring, it is possible to continuously monitor the abnormality of crops in real time. For this, standard growth information of crops is required and relative growth considering the cultivation environment must be identified. With the relationship between GDD (Growing Degree Days), which is the cumulative temperature related to crop growth obtained from ideal cultivation management, and the vegetation index as standard growth information, compared with the vegetation index observed with the spectral reflectance sensor (SRSNDVI& SRSPRI) in each rice paddy treated with standard cultivation management and non-fertilized, it was quantitatively identified as a time series. In the future, it is necessary to accumulate a database targeting various climatic conditions and varieties in the standard cultivation management area to establish a more reliable standard growth information.

Fabrication of a prototype of the Belle-II central drift chamber for development of the level-1 trigger system

Won Eunil,Moon Hyunki 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.2

The Belle-II experiment at the SuperKEKB aims to achieve a target instantaneous luminosity of 8 × 1035 cm−2s−1 . To cope with the design luminosity, the sub-detectors and the level-1 trigger system are required to be upgraded. The central drift chamber in the Belle-II detector which plays a primary role in the track reconstruction of charged particles is a multi-wire drift chamber with 14,336 channels. The central drift chamber-based trigger is responsible for distinguishing specific types of physics, which is based on fast track reconstruction. The fabrication of a small prototype of the central drift chamber and the development process of the central drift chamber-based trigger system are described.

Development of an event time finding algorithm for multi-wire drift chamber-based Level-1 trigger system in the Belle II experiment

Won Eunil,Moon Hyunki 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.2

The Belle II detector at the SuperKEKB e+e− collider in Japan is designed for precise measurements of weak interaction parameters and new physics beyond the Standard Model; therefore, it requires very high instantaneous luminosity. To handle such high luminosity, the level-1 trigger system in the Belle II experiment is designed to efficiently trigger events of interest with the highest efficiency. Among many sub-detectors, track reconstruction of charged particles is performed using information collected from the central drift chamber. Therefore, the central drift chamber-based trigger plays a central role in distinguishing specific types of physics based on fast track reconstruction. To improve the longitudinal position resolution of a track vertex and for the fine-tuning of trigger signal timing, the time of the collision, which we call event time, is necessary. We developed an event time finding algorithm using the wire hit time information obtained from the central drift chamber and validated our algorithm through Monte Carlo simulation.

나는 전문가인가?

유선욱(Yoo, Sunwook),문현기(Moon, Hyunki) 한국광고홍보학회 2015 광고연구 Vol.0 No.107

본 연구는 광고실무자인 한국의 광고회사 종사자들을 대상으로 전문직업적 정체성(professional identity)과 직업적 웰빙(occupational wellbeing), 직무열의(job engagement)와 직무소진(job burnout), 직무효과 변인인 직무만족(job satisfaction)과 직무성과(job performance)가 성별, 경력, 직급에 따라 어떻게 다른지 살펴보고, 이들 간의 관계를 검증하였다. 연구 결과, 전문직업적 정체성, 직무열의, 직무성과의 성별에 따른 차이가 유의미하게 나타난 가운데 모두 남성 실무자들에게 높게 나타났다. 경력에 따라서는 전문직업적 정체성에서만 유의미한 차이가 나타났다. 경력이 많을수록 전문가로서의 정체성 인식이 강한 것으로 나타났으며, 특히 5년 미만과 10년 이상의 경력을 지닌 그룹 간 차이가 유의미했다. 직업적 건강이나 직무효과성 인식에 있어서는 경력 간 차이가 유의미하게 나타나지 않았다. 직급에 따라서는 직무소진을 제외한 모든 요인에서 사원 · 대리급과 부장 이상 급 간에 유의미한 차이가 발견되었다. 전문직업적 정체성 인식과 직무만족에 있어서는 과 · 차장급과 부장 이상 급 간 차이도 유의미했다. 전문직업적 정체성과 직무만족, 직무성과와의 관계에서 직무열의는 부분매개 효과를 갖는 반면, 직무소진은 직무만족에서만 부분매개로 작용함이 나타났다. 직무소진은 직무성과를 유의하게 예측하지 않은 것으로 나타나, 광고실무자의 전문직업적 정체성과 직무성과를 매개하지 않았다. 본 연구는 광고회사의 실무자들은 전문직업적 정체성을 가질수록 직무에 만족하고, 긍정적인 성과를 이끌어 낸다는 것을 이론적으로 규명하였으며, 또 스스로 전문가라고 생각하는 광고실무자들은 직무에 헌신하고 몰입하며 활력을 갖게 되어 자신의 일에 더 만족하고 일을 더 잘하고 있는 것으로 인식한다는 것을 발견하였다. 본 연구는 광고 종사자들의 타 직종으로의 이직 및 전직이 심각한 수준에 이른 현재의 광고산업 환경에서, 광고실무자들의 전문직업적 정체성 제고를 통해 건강한 직업인으로서 업무에 임하며 직무에 만족하고 좋은 성과를 낼 수 있도록 각각의 광고회사와 산업 차원에서 제도적 정비와 방안이 마련되어야 함을 강조하며 실무적 시사점을 제시하였다. This study on advertising practitioners in Korea has two purposes. One is to examine how professional identity, job engagement and job burnout(occupational wellbeing variables), and job satisfaction and job performance differ based on gender, work experiences, and positions of advertising agency employees in Korea. The other is to verify the relationships between theses variables above. The results of the study show the following. The differences of professional identity, job engagement, and job performance based on gender were statistically significant, and male practitioners had higher means than female practitioners. Based on work experiences, only professional identity showed significant difference. Seniors showed strong professional identity, and there was a stalk difference between less than 5 years group and more than 10 years group. For variables like occupational wellbeing, job satisfaction and job performance, differences in work experiences, were not significant. Based on position, significant differences were found in all variables except job burnout between juniors and department heads and above. In case of professional identity and job satisfaction, differences between managers and department heads and above(were also significant. In professional identity"s effect on job satisfaction and job performance, job engagement appears to have partial mediation. Whereas, job burnout appears to have partial mediation on job satisfaction only. Job burnout doesn"t have significant effect on job performance, hence job burnout does not have any mediating effect between professional identity and job performance. The study investigated theoretically that the more advertising practitioners have professional identity, the more they are satisfied with their job, and the more they yield positive performance. Also, advertising practitioners who think of themselves as professionals were found to be more dedicated to their work, more engaged, and more energetic, and are therefore more satisfied with their work. In the present advertising industry which shows high rate of career changes, the study provides practical implications that each advertising agency as well as advertising industry as a whole should prepare improvement and reorganization of systems to enhance professional identity of advertising practitioners so that they are satisfied with their job and yield better performance.