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.

액정을 이용한 광소자의 개발 동향

김재훈,Kim, Jae-Hun 한국정보디스플레이학회 2002 인포메이션 디스플레이 Vol.3 No.1

객체지향 종속 추적 및 체크포인팅(checkpointing)을 이용한 복구 가능한 분산 공유 메모리 시스템

김재훈,Kim, Jae-Hun 한국정보처리학회 1999 정보처리논문지 Vol.6 No.2

Many message logging and checkpointing schemes are proposed for fault tolerance in distributed systems in which nodes communicate by message passing. Most researches for recoverable distributed shared memory (DSM) also adopt similar schemes used in message passing systems. However, schemes used in message passing systems are not always appropriate to be directly used in DSM systems because the two systems, message passing systems and DSM systems, have different natures (function shipping and data shipping). Many modified schemes have been proposed for DSM systems to resolve these differences. In this paper, an object oriented approach is proposed for recoverable DSM. We present a new dependency tracking scheme between pages instead of processes. Based on this scheme, we propose new checkpointing and recovery schemes that can reduce overhead to make DSM recoverable. 메시지 전달 방식으로 노드간 통신을 하는 분산 시스템의 고장허용을 위하여 메시지 저장과 체크 포인팅에 관한 많은 연구가 이루어졌다. 복구 가능한 분산 공유메모리 시스템에 대한 대부분의 연구 또한 메시지 전달 방식에서 사용되었던 방법을 채택하였다. 그러나, 메시지 전송시스템과 분산공유메모리 시스템의 근본적인 차이(함수전달(function shipping)과 데이터전달(data shipping)의 차이) 때문에 메시지 전달 시스템에서 사용되었던 방식이 분산공유메모리 시스템에 항상 적합하게 사용될 수 없다. 본 논문에서는 복구 가능한 분산공유메모리 시스템을 위하여 객체지향방법을 제안하였다. 프로세스간 종속 추적대신 페이지간 종속 추적을 이용한 체크 포인팅 및 복구 가능한 전략을 분산 공유 메모리 시스템에 적용하였다.

시간지연과 입력포화를 갖는 T-S 퍼지 카오스 시스템의 동기화

김재훈,신현석,김은태,박민용,Kim Jae-Hun,Shin Hyunseok,Kim Euntai,Park Mignon 대한전자공학회 2005 電子工學會論文誌-SC (System and control) Vol.42 No.1

본 논문에서는 시간지연과 입력포화를 갖는 카오스 시스템에 대한 퍼지 모텔 기반의 동기화 기법을 제안한다. 시간지연을 갖는 카오스 마스터 시스템과 슬레이브 시스템을 모델링하기 위해 Takagi-Sugeno(T-S) 퍼지 모델을 이용한다. 특히 슬레이브 시스템은 제어 입력이 제한되는 입력포화 특성을 갖는다고 가정한다. 선형 오차 피드백과 병렬 분상 보상(PDC) 방법에 따라 퍼지 카오스 동기화 시스템을 설계하고 동기화 오차 시스템의 국소 안정도 조건을 해석한다. 신호 전송 채널에는 시간지연이 항상 존재하므로 채널 시간지연 또한 고려한다. 입력포화와 시간지연을 갖는 퍼지 동기화 시스템의 국소 안정도에 대한 충분 조건은 Lyapunov-Krasovskii 이론을 적용하여 선형 행렬 부등식 (LMI) 문제의 해를 통해 얻어진다. 제안된 동기화 기법의 효과를 확인하기 위해서 모의 실험을 수행한다. This paper presents a fuzzy model-based approach for synchronization of time-delay chaotic system with input saturation. Time-delay chaotic drive and response system is respectively represented by Takagi-Sugeno (T-S) fuzzy model. Specially, the response system contains input saturation. Using the unidirectional linear error feedback and the parallel distributed compensation (PDC) scheme, we design fuzzy chaotic synchronization system and analyze local stability for synchronization error dynamics. Since time-delay in the transmission channel always exists, we also take it into consideration. The sufficient condition for the local stability of the fuzzy synchronization system with input saturation and time-delay is derived by applying Lyapunov-Krasovskii theory and solving linear matrix inequalities (LMI's) problem. A numerical example is given to demonstrate the validity of the proposed approach.

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.

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.

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.

고로슬래그미분말을 혼입한 고유동콘크리트에서 골재조합이 콘크리트 유동성상에 미치는 영향에 관한 실험 연구

김재훈,윤상천,지남용,Kim, Jae-Hun,Yoon, Sang-Chun,Jee, Nam-Yong 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.4

The purpose of study is to offer base data for high fluid concrete mix property, as grasp effect of aggregate to reach much more effect for producing high fluid concrete. For this study, there are three types of combined aggregates, river sand + river aggregate(type A), river sand + crusted aggregate(type B), washed sea sand + crushed aggregate(type C) and take a factor, water-contents, water-binder ratio and S/a. And so, we had following conclusion, resulting application-ability of high fluid mortar by K-slump tester to use a handy consistency measuring instrument. And so, we had following conclusion, resulting application-ability of high fluid concrete by K-slump tester to use a handy consistency measuring instrument. 1) In cafe of regular water binder ratio, high fluid concrete suffered much effect of combined aggregates and water binder ratio. Range of water binder ratio by combined aggregates is w/b 0.4 downward(type A and B), w/b 0.35 downward(type C). 2) Water contents to need for producing high fluid concrete is minimum 170kg/$\textrm{m}^3$ without regard to combined aggregates. 3) The effect of S/a on high fluid concrete by combined aggregates is approximately S/a 50% (type A and B), s/a 50-55% (type C). 4) Consistency measuring of high fluid concrete by K-slump tester is possible and first indication value, high fluid concrete can be produced, is 6~10.5cm.

플라즈마 조사에 의한 전기분무합성 SiO₂ 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.

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.