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.

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.

열전달 해석을 이용한 VAR 공정 변수가 티타늄 합금 잉고트 응고 조직에 미치는 영향 연구

김종환,이재현,허성강,현용택,이용태,Kim, Jong-Hwan,Lee, Jae-Hyeon,Heo, Seong-Gang,Hyeon, Yong-Taek,Lee, Yong-Tae 한국재료학회 2002 한국재료학회지 Vol.12 No.5

VAR process is required to control its various operating parameters. Heat transfer simulation has been accomplished to understand development of solidification micro and macro-structures during VAR process in Ti alloys. Optimum VAR process parameters could be also estimated in this study. It was found that macro-structures were closely related to the shape and depth of liquid pool, and solidification parameters, such as temperature gradient, heat flux, solid fraction. The cooling rates were higher at bottom, top, and center part respectively. As cooling rates increased, the $\alpha$ phase decreased in length, width and fraction. In order to evaluate which parameter affects the result of heat transfer calculation most sensitively, the sensitivities of input parameters to the simulation result were examined. The pool depth and cooling rate showed more sensitive to the temperature of the molten metal, heat transfer coefficient, and liquidus respectively. Also, these thermal properties became more sensitive at higher temperatures.

Direct Adaptive Control of Nonminimum Phase Systgems based on PID Structures

김종환,최계근,Kim, Jong-Hwan,Choi, Keh-Kun The Institute of Electronics and Information Engin 1986 전자공학회논문지 Vol.23 No.6

This paper presents direct adaptive controllers for single-input single-output nonminimum phase systems based on PID structures. Also, characteristics of these schemes are compared, and convergence properties are considered. In these schemes, controller parameters are estimated from the least-square algorithm and some additional auxiliary parameters are obtained from the proposed polynomial identity which is derived from the pole placement equation and the Bezout identity. The effectiveness of these schemes is demonstrated by computer simulation that has been carried out for a very difficult example.

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.

재귀적 베이시안 필터를 적용한 소화기탄의 충돌속도 추정 연구

김종환,조성식,Kim, Jong-Hwan,Jo, Seungsik 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.2

This paper presents a strike velocity estimation using the recursive Bayesian filter that operates both correction and prediction models to probabilistically remove noises of sensors and accurately estimate the strike velocity during the real-time experiments. Four different types of bullets such as 5.56 mm M193, 7.62 mm M80, 5.45 mm 7N10 and 7.62 mm MSC were used to validate the proposed method. Compared to the existing method, the proposed method statistically results in higher stability of the strike velocity estimation as well as its reliability for the ballistic limit velocity computation.

자랑스러운 KSLA인(人) - 김태승

김종환,Kim, Jong-Hwan 한국전문도서관협의회 2010 KSLA bulletin Vol.2 No.-

몬테칼로 시뮬레이션 기반의 다수 지상 연성표적에 대한 최적 조준점 산출

김종환,안남수,Kim, Jong-Hwan,Ahn, Nam-Su 한국시뮬레이션학회 2020 한국시뮬레이션학회 논문지 Vol.29 No.1

본 논문은 드론봇 전투체계를 운용하여 전투전단의 적 보병부대 위치정보를 수집하였을 시, 지휘관이 요구하는 적 부대 피해수준을 충족하면서 적 보병부대를 신속하고 정확하게 타격하기 위하여, 보유한 화력체계의 살상범위를 기초로 최적의 사격발수 및 조준점 위치를 실시간 자동으로 산출하는 인공지능 알고리즘 연구이다. 이를 위해, 100m×200m 크기의 야지 전장환경에서 증강된 소대급 규모의 적 보병부대를 임의로 전개 및 모의하고, 약 15m의 살상범위를 갖는 가상의 화력체계에 대한 모델링을 수행하였으며, 각개 적병사의 무피해/경상 및 중상/사망 등의 피해유형 및 임무수행 가능여부를 모의하기 위하여 연성표적의 피해효과에 적용되는 칼튼피해함수를 적용하고 전장의 불확실성을 모의하기 위하여 몬테칼로 시뮬레이션을 수행하였다. 또한, 지휘관 의도에 부합된 적부대의 피해수준을 달성하기 위하여, 반복적인 모의 및 비지도학습의 k-mean clustering 기법을 적용하여 최적의 사격발수 및 조준점 위치를 0.4초 이내로 산출하였다. 본 연구에서 제안하는 방법은 드론봇 전투체계를 운용하는 대대급 규모의 전투부대에서 '탐지-결심-타격' 의사결정시간의 단축에 기여할 것으로 판단된다. This paper presents a real-time autonomous computation of shot numbers and aiming points against multiple soft targets on grounds by applying an unsupervised learning, k-mean clustering and Monte carlo simulation. For this computation, a 100 × 200 square meters size of virtual battlefield is created where an augmented enemy infantry platoon unit attacks, defences, and is scatted, and a virtual weapon with a lethal range of 15m is modeled. In order to determine damage types of the enemy unit: no damage, light wound, heavy wound and death, Monte carlo simulation is performed to apply the Carlton damage function for the damage effect of the soft targets. In addition, in order to achieve the damage effectiveness of the enemy units in line with the commander's intention, the optimal shot numbers and aiming point locations are calculated in less than 0.4 seconds by applying the k-mean clustering and repetitive Monte carlo simulation. It is hoped that this study will help to develop a system that reduces the decision time for 'detection-decision-shoot' process in battalion-scaled combat units operating Dronebot combat system.

AIDP 환자(患者)의 한양방(韓洋方) 치료(治療) 1례(例)

김종환,박상욱,장자원,신우진,홍현우,김지윤,최인선,황원덕,Kim Jong-Hwan,Park Sang-Wook,Jang Ja-Won,Sin Woo-Jin,Hong Hyun-Woo,Kim Ji-Yun,Choi In-Sun,Hwang Won-Duek 대한한방내과학회 2003 大韓韓方內科學會誌 Vol.24 No.4

Introduction: Guillain-Barre syndrome(GBS) is defined as a recognizable clinical entity that is characterized by rapidly evolving symmetric limb weakness, a loss of tendon reflexes, absent or mild sensory signs, and variable autonomic dysfunctions. Recently there is an opinion that Acute Inflammatory Demyelinating Polyradiculoneuropathy'(AIDP) is more effective than 'GBS' for the symptoms. These symptoms are applicable to rheumatic arthritis(痺), flaccid paralysis of limb(?) caused by wind, cold and dampness(風, 寒, 濕) from an oriental medical view point. On this, we reported one case that diagnosed as 'complex of rheumatic arthritis(痺) and flaccid paralysis of limb(?)' at our oriental medical hospital. Result: we considered these symptoms as 'complex of rheumatic arthritis(痺), flaccid paralysis of limb(?)'. In accordance with the result, we treated the patient with Chung-Sang Tong-Jung On-Ha(淸上通中溫下). We concluded that external factors such as wind, cold and dampness(風, 寒, 濕) and internal factors like vital energy's disharmony(生氣不調和) affected the patient.

부자의 메탄올 추출물에 의한 신세포암의 증식억제 및 세포사멸 유도

김종환,최영현,황원덕,Kim, Jong-Hwan,Choi, Yung-Hyun,Hwang, Won-Deuk 대한한방내과학회 2008 大韓韓方內科學會誌 Vol.29 No.1

Aconiti Tuber is a traditional medicinal plant generally used in Oriental medicine therapy. In this study, we investigated the biochemical mechanisms of anti-proliferative effects by the methanol extract of Aconiti tuber (MEBJ) in Caki-1 human renal cell carcinoma cells. It was found that MEBJ could inhibit, in a dose-dependent manner, cell growth which was associated with apoptotic cell death such as formation of apoptotic bodies, DNA fragmentation and increased populations of apoptotic-sub G1 phase. Apoptosis of Caki-1 cells by MEBJ was associated with an up-regulation of pro-apoptotic Bax expression, and a down-regulation of anti-apoptotic Bcl-2 in a dose-dependent manner; however, the levels of IAP family were not affected. MEBJ treatment also induced the proteolytic activation of caspase-3 and -8, and a inhibition of poly(ADP-ribose) polymerase (PARP) and $PLC{\gamma}1$ protein. Furthermore, MEBJ treatment caused a dose-dependent inhibition of iNOS and cyclooxygenase-2 (Cox-2). Though further studies will be needed to identify the active compounds that confer the anti-cancer activity of MEBJ, the present findings provide important new insights into the possible molecular mechanisms of the apoptotic activity of MEBJ in cancer cells.