고분자 기판위에 다층 구조의 박막형 보호층을 적용한 투습률 향상

김종환,한진우,김영환,서대식,Kim Jong-Hwan,Han Jin-Woo,Kim Young-Hwan,Seo Dae-Shik 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.3

In this paper, the inorganic-organic thin film encapsulation layer was newly adopted to protect the organic layer from moisture and oxygen. Using the electron beam, Sputter and Spin-Coater system, the various kinds of inorganic and organic thin-films were deposited onto the Ethylene Terephthalate(PET) and their interface properties between organic and inorganic layer were investigated. In this investigation, the SiON and Polyimide(PI) layer showed the most suitable properties. Under these conditions, the WVTR(water vapour transition rate) for PET can be reduced from level of $0.57\;g/m^2{\cdot}day$ (bare subtrate) to $1{\times}10^{-5}\;g/m^2{\cdot}day$ after application of a SiON and Polyimide layer. These results indicates that the SiON/PI/SiON/PI/PET barrier coatings have high potential for flexible organic light-emitting diode(OLED) applications.

학술세미나 주요 발표 - 국방전문도서관의 ISP 수립 -국방과학연구소 기술정보실 사례 소개-

김종환,Kim, Jong-Hwan 한국전문도서관협의회 2012 KSLA bulletin Vol.4 No.-

기준모델 적응 제어의 새로운 해석

김종환,박준렬,최계근,Kim, Jong-Hwan,Park, Jun-Ryeol,Choe, Gye-Geun 대한전자공학회 1985 전자공학회지 Vol.22 No.3

Pad'e-Type 근사화법을 이용하여 새로운 기준모델 적응 제어계를 설계하였다. 공정의 파라미터를 모르는 상태에서 제어계를 설계하여 이로부터 제어목적을 만족시키는 등가 방정식을 유도하여 이조건을 만족시키는 파라미터를 반복적으로 추정하였다. 이결과 추정할 공정의 파라미터 갯수를 줄이는 효과를 얻을 수 있다. 기존의 방법과 새로운 방법을 컴퓨터 시뮬레이tus으로 나타내었다. A Novel design of MRAC for achieving independent tracking and regulation objectives by applying Pad e-Type approximation in the controller parameter estimation is presented. The design of the controller is done with the unknown plant parameters from the first. The result of the design is a simple control scheme with the reduction of estimation para-meters. The performance of rho proprosed contiol structure in tracking and regulation is compared with the other method by computer simulation.

삼기층(三紀層) 퇴적암(堆積岩) 중(中) 비석(沸石)의 산출상태(産出狀態)

김종환,문희수,Kim, Jong-hwan,Moon, Hee-Soo 대한자원환경지질학회 1978 자원환경지질 Vol.11 No.2

Of more than 30 varieties of zeolite group minerals, 7 varieties, mordenite, clinoptilolite, natrolite laumontite, stilbite, stellerite and chabazite are identified in Korea, whereas mordenite and clinoptilolite occur in Miocene sediments of small Yonil tertiary basin, east coast of Korea. The basin consists of three separate groups of sediments called Janggi, Gampo and Haseo, which are not correlated stratigraphyically yet. Zeolite occurs alternating with montmorillonite layers in Nuldaeri, Yongdongri and Haseori tuffs of Jahanggi, Gampo and Haseo Groups respectively. Zeolite was formed by diagenesis. of acidic volcanic tuffs.

핵연료 자원개발과 그 전망

김종환,Kim, Jong-Hwan 한국과학기술단체총연합회 1981 과학과 기술 Vol.14 No.7

초음속 비행체 구조재료에 대한 열기계적 특성

김종환,이기범,이경용,Kim, Jong-Hwan,Lee, Kee-Bhum,Lee, Kuong-Yong 한국군사과학기술학회 2005 한국군사과학기술학회지 Vol.8 No.2

The thermomechanical characteristics were evaluated for 17-4PH stainless steel widely used in supersonic airframe subjected to both aerodynamic loading and heating. The thermomechanical tests were conducted under both elevated temperature and rapid heating condition from $1^{\circ}C/sec\;to\;28^{\circ}C/sec$. The thermomechanical behaviors under rapid heating were compared with those of elevated temperature after 1/2 hour exposure in terms of yield stress to investigate the influence of heating rates. A heating rate-yield temperature parameter was suggested for rapid heating based on time-temperature parameters, and master yield stress curve was obtained by using these parameters. The experimental results and methodology from this study can be used as basic engineering data when designing supersonic vehicle structures subjected to aerodynamic loading and severe heating environment.

유전자 로봇

김종환,Kim, Jong-Hwan 한국과학기술단체총연합회 2005 과학과 기술 Vol.38 No.5

급성기 뇌졸중 환자의 한양방 협진치료에 대한 임상적 고찰

김종환,신우진,장자원,김지윤,민성순,황원덕,Kim, Jong-Hwan,Sin, Woo-Jin,Jang, Ja-Won,Kim, Ji-Yun,Min, Sung-Soon,Hwang, Won-Duek 대한한방내과학회 2004 大韓韓方內科學會誌 Vol.25 No.4

Object : This is a study of acute stage stroke patients designed for comparison of combined Eastern and Western medical treatments and Oriental treatments alone. Methods : 51 patients were diagnosed by Brain-CT and Brain-MRI scan as having suffered stroke. They had entered Dong-eui hospital within seven days of attack, and remained over seven days, all between November 2002 and August 2003. Patients were divided into two groups: a group treated with both Eastern and Western medical treatments, and a group treated only with Oriental medical treatments (but examinations were done and medications were given in hypertension, Diabetes Mellitus and so on). Results : The Eastern-Western medical treatment group showed significant changes in NIHSS. A rate of improvement figure of 24.94% was obtained for the Eastern-Western medical treatment group, and for the Oriental medical group a figure of 7.84% was obtained. Conclusion : The East-West medical treatment group had significant rate of development that measure for NIHSS by treated comparatively dependent patients. And oriental medical treatment group had significant rate of development that measure for NIHSS by treated comparatively independent patients. The NIHSS measure for the Eastern-Western medical treatment group shows a significant rate of improvement for relatively dependent patients, and the NIHSS measure for the Oriental medical treatment group shows a significant rate of development for relatively independent patients.

Explicit M.R.A.C. 알고리즘을 이용한 직류 전동기 속도 제어

김종환,박준렬,최계근,Kim, Jong-Hwan,Park, Jun-Ryeol,Choe, Gye-Geun 대한전자공학회 1983 전자공학회지 Vol.20 No.6

본 연구는 explicit M.K.A.C. 알고리즘으로 마이크로프로세서를 사용하여 직류전동기 속도 제어를 하였다. 실험에 사용된 적응 제어 알고리즘으로는 먼저 지수함수적 가중 최소사승법 (exponentially wighted least square method: E.W.L.S) 알고리즘의 계산상의 불안정과 수행시간을 최소로 하기 위하여 시간 지연이 있는 E.W.L.S.알고리즘에 EDUt-_인수화법을 도입한 UDUt-인수화법 알고리즘을 사용하였고, 또한 gradient-type의 알고리즘으로도 초기에 dtatl-zollr을 갖는 직류전동기를 효과적으로 제어하기 위하여 gradient-type의 알고리즘에 smoothing polynomal과 상수ℓ을 사용한 SM gradient-쇼pe의 알고리즘을 제안하였다. UDTt인수화법 알고리즘을 적용한 결과 수행시간이 단축되었으며, SM gradient-type의 알고리즘의 경우는 dead-zone을 위한 기동전압을 사용하지 않고도 효과적인 속도제어를 할 수 있음을 확인하였다. In this paper, the application of the explicit M.R.A.C. algorithms to the D.C. motor speed control using the microprocessor is studied. The adaptation algorithms are derived from the gradient method and the exponentially weighted least square [E.W.L.S.] method. In order to minimize the computational instability of the E.W.L.S. method, the adaptation algorithm of UDUt factorization method is developed, and because of the characteristics of the D.C. motor (dead-aone phenomenon) , the SM. gra-dient type algorithm is also improved from the gradient type algorithm. Computer simulations and experiments show that these algorithms adapt well to the rapid change of the reference input and the load.

영상정보에 기초한 전차 자율탐지 및 조준점탐색 연구

김종환,정치정,허미라,Kim, Jong-Hwan,Jung, Chi-Jung,Heo, Mira 한국시뮬레이션학회 2018 한국시뮬레이션학회 논문지 Vol.27 No.2

본 논문은 지상무인전투체계 중의 하나인 무인경전투차량이 RGB 영상정보를 기초로 스스로 전차를 탐지하고 조준점을 산출하는 지능형 표적획득/처리기술의 기초연구이다. 무인 경전투 차량이 전장에서 적 전차와 조우 시, 적 전차를 자율적으로 탐지하고 스스로 조준하는 방법을 개발하기 위해, 영상정보로부터 전차의 주요특징을 식별 및 추출하고, Maximally stable extremal regions, 중간값 필터, k평균 클러스터링 그리고 Morphological filtering의 영상처리기법 및 인공지능 알고리즘을 통해 전차의 외형정보를 추출 및 분석하였으며, 식별된 전차 외형정보를 벡터화하여 전차의 중앙을 지향하는 조준점을 산출하였다. 또한, 본 연구의 성능을 측정하기 위해 선진국들의 주력전차의 영상정보를 수집 및 분석하였고, 제안한 방법의 객관적인 전차탐지 성능은 정확도 91.6%, 정밀도 90.4%, 재현율 85.8% 그리고 F-measure 88.1%의 결과를 보여주었다. 본 연구가 무인전투체계의 지능형 표적획득/처리기술 연구개발에 도움이 되기를 기대한다. This paper presents an autonomous detection and aiming point computation of a battle tank by using RGB images. Maximally stable extremal regions algorithm was implemented to find features of the tank, which are matched with images extracted from streaming video to figure out the region of interest where the tank is present. The median filter was applied to remove noises in the region of interest and decrease camouflage effects of the tank. For the tank segmentation, k-mean clustering was used to autonomously distinguish the tank from its background. Also, both erosion and dilation algorithms of morphology techniques were applied to extract the tank shape without noises and generate the binary image with 1 for the tank and 0 for the background. After that, Sobel's edge detection was used to measure the outline of the tank by which the aiming point at the center of the tank was calculated. For performance measurement, accuracy, precision, recall, and F-measure were analyzed by confusion matrix, resulting in 91.6%, 90.4%, 85.8%, and 88.1%, respectively.