원자층 증착법으로 성장한 HfO₂ 박막의 제조

김희철,김민완,김형수,김혁종,손우근,정봉교,김석환,이상우,최병호,Kim Hie-Chul,Kim Min-Wan,Kim Hyung-Su,Kim Hyug-Jong,Sohn Woo-Keun,Jeong Bong-Kyo,Kim Suk-Whan,Lee Sang-Woo,Choi Byung-Ho 한국재료학회 2005 한국재료학회지 Vol.15 No.4

The growth of hafnium oxide thin films by atomic layer deposition was investigated in the temperature range of $175-350^{\circ}C$ using $Hf[N(CH_3)_2]_4\;and\;O_2$ as precursors. A self-limiting growth of $0.6\AA/cycle$ was achieved at the substrate temperature of $240-280^{\circ}C$. The films were amorphous and very smooth (0.76-0.80 nm) as examined by X-ray diffractometer and atomic force microscopy, respectively. X-ray photoelectron spectroscopy analysis showed that the films grown at $300^{\circ}C$ was almost stoichiometric. Electrical measurements performed on $MoW/HfO_2$(20 nm)/Si MOS structures exhibited high dielectric constant$(\~17)$ and a remarkably low leakage current density of at an applied field of $1.5-6.2\times10^{-7}A/cm^2$ MV/cm, probably due to the stoichiometry of the films.

Bell's Palsy와 Ramsay Hunt Syndrome 환자군의 치료 기간에 따른 호전도의 비교 연구

김희철,김정호,김영일,Kim, Hee-Chul,Kim, Jeong-Ho,Kim, Young-Il 대한침구의학회 2008 대한침구의학회지 Vol.25 No.4

Objectives : The aim of this study is comparing the improvement of Bell's palsy and Ramsay hunt syndrome according to treatment duration. Methods : The 11cases diagnosed as Ramsay hunt syndrome and 30cases of Bell's palsy who visited Cheong-ju Oriental Medical hospital from February 2006 to June 2008 were evaluated. We used Yanagihara's unweighted Grading System to confirm the improvement. Results : In the analysis of cause, except the "none", the most common cause was "Overwork" in both two group. After 5-day treatment the score was getting worse but after 10-day treatment score was improved in both group. The improvement of Bell's palsy group was better than that of Ramsay hunt syndrome group after 5-day and 10-day treatment, but there was no significance. Conclusions : In comparison of Yanagihara's unweighted grading score checked before treatment, after 5-day, 10-day and 15-day treatment between Bell's palsy and Ramsay hunt sundrome, there was no statistical significant difference.

산발성 위암에서 Microsatellite Instability 빈도와 hMLH1 촉진자부위 메칠화

김희철,노선애,육정환,오성태,김병식,유창식,김진천,Kim Hee Cheol,Roh Sun Ae,Yook Jeong Hwan,Oh Sung Tae,Kim Byung Sik,Yu Chang Sik,Kim Jin Cheon 대한위암학회 2003 대한위암학회지 Vol.3 No.1

Background: An aberrant function of the mismatch repair system has been reported to underlie carcinogenesis in several tumors, including colorectal and gastric carcinomas, and to induce the typical genotype of microsatellite instability (MSI). Purpose: We aimed to determine the frequency of MSI in early-onset sporadic gastric carcinoma and elucidate the role of promoter methylation in hMLH1 as the mechanism of MSI. Materials and Methods: Thirty-six early-onset sporadic gastric carcinomas were analyzed to determine the status of MSI and the frequency of methylation of the promoter region in hMLH1. MSI was determined using five markers recommended by NCI: MSI-H (high), MSI-L (low), and MSS (Microsatellite stable). Methylation specific PCR (MSP) and direct automated genomic sequencing analysis with DNA modified by sodium bisulfite have been performed to confirm promoter region methylation. All the data were analyzed regarding characteristics of molecular changes, and clinicopathologic variables. Results: The microsatellite status was determined as MSI-H in five cases ($13.8\%$), MSI-L in 13 cases ($36.1\%$), and MSS in 18 cases ($50.0\%$). hMLH1 was methylated in seven cases ($19.4\%$). In all cases of MSI-H, promoter of hMLH1 was methylated, and in two of the 13 cases of MSI-L, hMLH1 promoter methylation was identified. Methylation was not found in any cases of MSS. Promoter methylation in hMLH1 was significantly correlated with MSI status (P<0.001). We could not find any relationship between MSI and clinicopathologic parameters. Conclusion: These results suggest that an abnormal function of the mismatch repair system may be associated with gastric carcinogenesis in more than $10\%$ of early-onset gastric carcinomas and MSI appeared to be closely related to the promoter methylation in hMLH1.

그라우팅 자동관리 시스템(AGS)을 이용한 동홍천-양양 고속도로 14공구 저토피구간 강관보강그라우팅 시공사례

김희철,장기영,김진춘,이왕준,김병용,Kim, Hui-Cheol,Jang, Gi-Yeong,Kim, Jin-Chun,Lee, Wang-Jun,Kim, Byeong-Yong 한국지반공학회 2011 지반 : 한국지반공학회지 Vol.27 No.3

국내 최장대 도로터널(인제터널)의 시멘트광물계 급결제 적용사례

김희철,김대형,조남섭,김관일,Kim, Hui-Cheol,Kim, Dae-Hyeong,Jo, Nam-Seop,Kim, Gwan-Il 한국터널지하공간학회 2011 자연, 터널 그리고 지하공간 Vol.13 No.6

한국산업과 공과대학교육

김희철,Kim, Hui-Cheol 한국과학기술단체총연합회 1974 과학과 기술 Vol.7 No.10

건강한 기상을 위한 최적의 렘 수면기 알람기능 베개의 센싱 장치 개발

김희철,Kim, Hee-Chul 한국전자통신학회 2016 한국전자통신학회 논문지 Vol.11 No.2

사람은 하루 7~8시간 잠자는 동안 20~30번 자세를 바꿈으로 해서 최적의 수면 활동을 유지하려 한다. 최적의 수면을 제공하기 위해서는 베개 내부에 코골이 습관은 물론이고 개인의 수면 패턴을 감지할 수 있는 Sensing시스템과 Sensor에서 출력되는 정보를 분석 가공하는 프로그램 및 정보를 제공하는 디스플레이 장치를 통해 파악된 각종 수면 데이터를 효과적으로 활용하기 위한 센싱 장치의 개발이 필요하다. 본 논문에서는 수면 중 인 사람의 뒤척임을 감지해 수면 패턴을 분석하고 분석된 자료를 바탕으로 수면 건강에 대한 적극적인 관리 할 수 있는 웰빙 베개를 개발하고자 한다. People try to maintain optimal sleep activity to a changing attitude 20-30 times while sleeping 7-8 hours a day. In order to provide optimal sleep, we need to develop sensing device for apply effective various sleep data acquired through display device that can provide program and information which process and analyze information printed out from sensor and sensing system. In this paper, we analyze sleep pattern to detect the toss and turn while a person's sleeping and we develop a wellness pillow that can be active on sleep health management based on the analyzed data for sleep patterns.

독활기생탕(獨活寄生湯)이 백서(白鼠)의 혈액(血液)에 미치는 영향(影響)

김희철,Kim, Hui-Cheol 대한한방내과학회 1995 大韓韓方內科學會誌 Vol.16 No.2

In order to study the effect of Dokwhalgisaentang on the blood in normal rats with Dokwhalgisaentang extract solution was adminstrated in rats. The rats carried on every day for 5days, l0days and 15days respecitively on the corresponding blood in rats, and thereafter the contents of serum BUN, creatinine, creatine, total protein, albumin, total bilirubin, cholesterol were measured in rats. The following results have been obtained : 1. Dokwhalgisaentang extract decreased the serum BUN significantly in rats. 2. Dokwhalgisaentang extract decreased the serum creatine significantly in rats. 3. Dokwhalgisaentang extract decreased the serum creatinine significantly in rats. 4. Dokwhalgisaentang extract decreased the serum total protein significantly in rats. 5. Dokwhalgisaentang extract decreased the serum albumin significantly in rats. 6. Dokwhalgisaentang extract increased the serum total bilirubin significantly in rats. 7. Dokwhalgisaentang extract decreased the serum cholresterol significantly in rats.

강도함수 특성에 근거한 소프트웨어 최적 방출시기에 관한 비교 연구

김희철,박형근,Kim, Hee-Cheul,Park, Hyoung-Keun 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.4

본 연구에서는 소프트웨어 제품을 개발하여 테스팅을 거친 후 사용자에게 인도하는 시기를 결정하는 방출문제에 대하여 연구되었다. 인도시기에 관한 모형은 무한 고장수에 의존하는 비동질적인 포아송 과정을 적용하였다. 이러한 포아송 과정은 소프트웨어의 결함을 제거하거나 수정 작업 중에도 새로운 결함이 발생될 가능성을 반영하는 모형이다. 강도함수는 여러 수명 분포들을 적합시키는데 효율적인 특성을 가진 콤페르쯔, 파레토, 로그-로지스틱 패턴을 이용하였다. 따라서 소프트웨어 요구 신뢰도를 만족시키고 소프트웨어 개발 및 유지 총비용을 최소화 시키는 방출시간이 최적 소프트웨어 방출 정책이 된다. 본 논문의 수치적인 예에서는 고장 간격 시간 자료를 적용하고 모수추정 방법은 최우추정법과 추세분석을 통하여 자료의 효율성을 입증한 후 최적 방출시기를 추정하였다. In this paper, we were researched decision problem called an optimal release policies after testing a software system in development phase and transferring it to the user. The applied model of release time exploited infinite failure non-homogeneous Poisson process This infinite failure non-homogeneous Poisson process is a model which reflects the possibility of introducing new faults when correcting or modifying the software. The intensity function used Gompertz, Preto and Log-logstic pattern which has the efficient various property. Thus, optimal software release policies which minimize a total average software cost of development and maintenance under the constraint of satisfying a software reliability requirement becomes an optimal release policies. In a numerical example, after trend test applied and estimated the parameters using maximum likelihood estimation of inter-failure time data, estimated software optimal release time.

1 포인트 드래그 연동 스마트 터치 제어용 다이나믹 모터 개발

김희철,Kim, Hee-Chul 한국전자통신학회 2015 한국전자통신학회 논문지 Vol.10 No.3

교육용 로봇은 과학의 기초 원리를 배우고 과학적 창의성을 키우는 것에 효과적인 교육 도구로 소개되면서 방과 후 학습에 적용되어 과학 교육을 위한 교육용 키트의 구성이 바뀌고 있다. 중소기업을 중심으로 과학적 창의성을 키우는 도구로서 다양한 교육용 로봇 기술과 학생들을 위한 다양한 범주의 게임로봇기술이 개발되고 있고, 기존의 mp3 음악이나 e-Learning 콘텐츠의 제공과 같이 로봇용 전문콘텐츠를 다운받아 학습에 활용하는 기술을 개발 중에 있으나 아직 전문 커뮤니티 형성이 미흡한 편이다. 현재는 사용자가 손쉽게 제어가 가능한 인터페이스 모듈용 모터가 개발이 되어있지 않아 1포인트 드래그 연동 스마트터치 제어용 다이나믹 모터 개발이 필요하다. Educational robot was introduced as an effective educational tool is to foster scientific creativity and learn the basic principles of science are applied to change the configuration of the educational after-school learning kits for science education. SMEs as a tool to foster scientific creativity center and a variety of educational robot technology and the wide range of games for students and robotic technology development, existing e-Learning by downloading mp3 music or learning content for the robot, such as the provision of specialized content Although the technology is still being developed to take advantage of the professional community formation is insufficient side. Currently, one-point linkage drag Smart Touch control dynamic motor development does not need this motor development is possible for users to easily.