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RFCVD 장치를 이용하여 성장한 실리콘 나노와이어의 특성
김재훈,이형주,신석승,김기영,고춘수,김현숙,황용규,이충훈,Kim, Jae-Hoon,Lee, Hyung-Joo,Shin, Seok-Seung,Kim, Ki-Young,Go, Chun-Soo,Kim, Hyun-Suk,Hwang, Yong-Gyoo,Lee, Choong-Hun 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.2
We have synthesized silicon nanowires by using RFCVD(Radio Frequency Chemical Vapor Deposition) system on Au deposited p-type Si(100) wafers, and investigated their physical and electrical properties. The silicon nanowires had been grown in the atmospheres of $H_{2},\;N_{2}\;and\;SiH_{4}$ at 10 Torr at the substrate temperatures of $700{\pm}5^{\circ}C\;and\;810{\pm}5^{\circ}C$ respectively. FE-SEM analysis revealed that diameters of the silicon nanowires are $50{\sim}60nm$ with the length of several ${\mu}m$. XRD analysis showed that the growth direction of the nanowires is Si[111]. Field emission characteristics showed that the turn-of voltages at the current of $0.01\;mA/cm^{2}$ are $10\;V/{\mu}m\;and\;8.5\;V/{\mu}m$ for the wires grown at $700{\pm}5^{\circ}C\;and\;810{\pm}5^{\circ}C$, respectively.
플라즈마 조사에 의한 전기분무합성 SiO<sub>2</sub> 코팅층의 물접촉각 변화
김재훈,이준성,김지영,김상섭,Kim, Jae-Hun,Lee, Junseong,Kim, Ji Yeong,Kim, Sang Sub 한국재료학회 2014 한국재료학회지 Vol.24 No.11
Hydrophilic $SiO_2$ layers were obtained by the atmospheric-pressure plasma treatment. Superhydrophobic $SiO_2$ layers were first deposited by the electrospray deposition method. The electrospunable solution that was prepared based on the solgel method was sprayed on Si (100) substrates. The surface of the electrosprayed $SiO_2$ layers consisted of the agglomeration of nano-sized grains, which led to a very high roughness and revealed a very high contact angle to water droplets over $162^{\circ}$. After having been exposed to the atmospheric $Ar/O_2$ plasma, the observed superhydrophobicity of the $SiO_2$ layers were greatly changed: a dramatic variation of the water contact angle from $162^{\circ}$ to $3^{\circ}$, namely realization of superhydrophillicity. Interestingly, the surface microstructure was almost preserved. According to the XPS analysis, it is more likely that thanks to the plasma exposure, the surface of $SiO_2$ layers will be cleaned in terms of organic species that are hydrophobic-inducing, consequently leading to the hydrophilic nature observed for the plasma-exposed $SiO_2$ layers.
고로슬래그 미분말을 함유한 고유동 모르터의 유동성상에 미치는 영향 요인에 관한 연구
김재훈,윤상천,지남용,Kim, Jae-Hun,Yoon, Sang-Chun,Jee, Nam-Yong 한국건축시공학회 2002 한국건축시공학회지 Vol.2 No.4
High fluid concrete unlike OPC concrete is made with various material, and the phase of fresh concrete is considerably different. In order to understand fluidity phase and mix properties of high fluid concrete, concrete is required to access as suspension structure which consists of aggregate and paste. The focus of this paper is to analyze the test results and quantify the effect of mix proportions of mortar and fineness modulus of sand on the properties of fresh mortar. The effect of water-binder ratio. sand-binder ration. contents of ggbs (by mass of total cementitious materials). and various contents of water reducing agent on the yield stress and plastic viscosity of the mix is studied. Based on the experimental results, the fellowing conclusions can be drawn: (1) The mixing time needed for high fluid mortar was approximately two times more than that of ordinary portland mortar. (2) The fluidity phase of mortar could be explained by yield stress of mix and the fluidity of mortar. (3) As the content of ggbs increased, yield stress of mortar was decreased and plastic viscosity of it was increased. (4) For the high fluid mortar, it was appeared that sand-binder ratio should be below 1.5.
대한불교조계종 중앙기록관 역사기록전시 - 기록으로 보는 한국불교와 조계종 -
김재훈,이경훈,Kim, Jae-Hun,Lee, Kyung-Hoon 한국기록학회 2006 기록학연구 Vol.0 No.13
기록을 관리하는 궁극의 목적은 이용 제공에 있다. 기록물전시회는 기록관 및 기록관리에 대한 대중적 인지도를 높이고, 이에 대한 관심을 제고시킬 수 있는 기회가 된다. 또한, 미지의 이용자에게 적극적으로 접근하여 서비스를 제공할 수 있다. 아울러, 아키비스트에게는 소장하고 있는 기록물에 대한 개괄적인 분류 및 평가를 할 수 있는 기회를 제공하기도 한다. 이러한 기록전시의 기능과 중요성에도 불구하고 기록물전시회를 개최한 기관 및 단체는 아직 많지 않은 형편이다. 본고에서는 대한불교조계종 중앙기록관의 역사기록전시 사례를 바탕으로 전시기획, 기록물 선별 및 전시 실제에 대하여 소개함으로써 기록전시의 참고 유형을 제시하고자 한다. The ultimate purpose of records management is for reference service. Archival exhibition provides an opportunity to raise the public's interest at archives and maintain records management and to offer the reference service to unknown users. As for archivists, archival exhibition allows to summarize generally the archives that he may have and to appraise its value. At the opening of the Memorial hall for the history and culture of Korean buddhism, the Archives of Jogye Order of Korean Buddhism held an archival exhibition by showing archives of Korean Buddhism History to the public. The exhibition mainly consists in 2 themes: History of Jogye Order of Korean Buddhism and its activities. Over 300 archives were selected in accordance with historicity, rarity and particularity of each archives that the Jogye Order of Korean Buddhism posses. The present paper aims to suggest different models of Archival Exhibition with the help of detailed explanation on Exhibition planning, Selection of archives and the practice.
CFRP로 보강된 철근콘크리트 보의 휨 보강효과에 관한 실험적 연구
김재훈,박성무,강주원,신승협,Kim, Jae-Hun,Park, Sung-Moo,Kang, Joo-Won,Shin, Seung-Hyup 한국공간구조학회 2006 한국공간구조학회지 Vol.6 No.2
최근 FRP Plate를 이용한 철근콘크리트 구조물의 보수보강 방법으로 많은 연구가 수행되어 왔다. 이러한 FRP Plate로 보강된 구조물의 경우 보강재 단부의 조기탈락에 대한 문제점이 많은 연구를 통하여 지적되었다. 본 논문은 이러한 보강재 단부의 조기탈락에 대한 대안으로 CFRP Plate 외부부착공법에 있어서 단부를 보강철물을 이용하여 2차적으로 보강하는 방법 및 CFRP-Rod 표면매립공법으로 횝 보강된 철근콘크리트 보의 구조적 거동 및 휨 보강 성능을 파악하는데 그 목적이 있다. 또한 보강 방법에 따른 효과적인 휨 보강 성능을 파악하기 위하여 CFRP Plate 외부부착공법과 CFRP-Rod 표면매립공법을 실험을 통하여 이를 비교 고찰하여 휨 보강 성능효과를 알아본다. Recently, many researches have been conducted about reinforced concrete structures strengthened with FRP plates. In case of structures strengthened with FRP plates, the issue of premature debonding FRP plate has been raised through many previous researches. The purpose of this paper is what structural behavior and flexaural capacity of reinforced concrete beams which are strengthened for flexure is investigated about the using secondary ironware in the method of external bonded CFRP plate, and the method of near surface mounted CFRP-Rod. Also, in order to evaluate flexural capacity, experiments of the reinforced concrete beams with exteranl bonded CFRP plate and near surface mounted CFRP-Rod have been compared and investigated.
카본블랙에 의한 천연고무 물성치와 피로수명 변화에 대한 실험적 연구
김재훈,김영학,정현용,Kim, Jae-Hun,Kim, Yeong-Hak,Jeong, Hyeon-Yong 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.11
The effects of carbon black on the material properties and the fatigue life of the carbon-black filled natural rubbers were investigated. Different kinds of carbon blacks resulted in different fatigue lives, hysteresis, and critical J-values. It was noticed that the hysteresis was inversely proportional to the difference between DBPA and CTAB, and the critical J-value was almost the same regardless of the length of a precrack. In addition, different kinds of carbon blacks resulted in different fracture morphologies, and micro-scale and macro-scale roughnesses. The critical J-value was proportional to the micro-scale roughness. and it seemed relate to the size distribution of carbon black particles. By reviewing all the experimental data. it was finally noticed that the logarithmic value of the fatigue life could be linearly expressed by a multiplication of the critical J-value and the logarithmic value of the hysteresis.
표적추적센서의 측정 바이어스 오차 보상에 의한 사격통제장치 성능 향상 기법
김재훈,유준,Kim, Jae-Hun,Lyou, Joon 한국군사과학기술학회 2000 한국군사과학기술학회지 Vol.3 No.2
A practical method is proposed to improve hit probability of the digital gun fire control system, when the measured rate of the tracking sensor becomes biased under some operational situation. For ground moving target it is shown that the well-known Kalman filter which uses position measurement only can be optimally used to eliminate the rate bias error. On the other hand, for 3D moving aircraft we present a new algorithm which incorporate FIR-type filter, which uses position and rate measurement at the same time, and the fixed-lag smoother using position measurement only, and show that it has the optimal performance in terms of both estimation accuracy and response time.
대형구조물 구동계통 실시간 시뮬레이션 모델 유도 및 연동 특성 분석에의 응용
김재훈,최영호,유웅재,유준,Kim, Jae-Hun,Choi, Young-Ho,Yoo, Woong-Jae,Lyou, Joon 한국군사과학기술학회 2000 한국군사과학기술학회지 Vol.3 No.1
A simulation model is developed to analyze the large-structure driving system and its integrated behavior in the whole weapon system. It models every component in the driving system such as mechanical and electrical characteristics, and it is programmed by simulation language in a way which strongly reflects the system's real time dynamics and reduces computation time as well. A useful parameter identification method is proposed, and it is tuned on the given physical system. The model is validated through comparing to real test, and it is applied to analysis and prediction of integrated system functions relating to the fire control system.