내시경적 유두 괄약근 절개술 후 지연성 출혈을 보인 총담관 결석 치험 1례

이창희,이윤경,채현석,김동언,김영훈,한승훈,이익준,Lee, Chang-Hee,Lee, Yoon-Kyung,Chae, Hyun-Seok,Kim, Dong-Un,Kim, Young-Hoon,Han, Seung-Hoon,Lee, Ik-Jun 대한소아소화기영양학회 2000 Pediatric gastroenterology, hepatology & nutrition Vol.3 No.2

Common bile duct stones are an unusual occurrence in children. Endoscopic retrograde cholangiopancreaticography and endoscopic papillary sphincterotomy are excellent tool for diagnosis and therapy. Bleeding after endoscopic papillary sphincterotomy occurs in approximately 0.5~12% of procedures. We experienced a case of common bile duct stone in 5-year-old boy. After endoscopic papillary sphincterotomy, the stone was passed. 5 days after the procedure bleeding occurred, but it was controlled spontaneously.

Mie 산란 방법과 엔트로피 해석 방법을 이용한 혼합연료비에 따른 분무 균질도 특성에 관한 연구

이창희,이기형,이창식,배재일,Lee, Chang-Hee,Lee, Ki-Hyung,Lee, Chang-Sik,Bae, Jae-Il 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.1

In this study, his technique was applied to a GDI spray in order to investigate the mixture distribution. In addition, the homogeneity degree and diffusion effect according to ambient temperature in the high pressure chamber were analyzed by using an entropy analysis method. From this experiment, we could find that entropy analysis is very effective method for the analysis of mixture formation, and the entropy values increase with the progress of uniformity in diffusion Process. we tried to provide the fundamental data for parameter which effects on the spray macroscopic characteristics with mixture ratio of diesel and gasoline. In addition, the mixture formation was analyzed by using entropy analysis. The entropy analysis is based on the concept of statistical entropy, and it identifies the degree of homogeneity in the fuel concentration. From the entropy analysis results we could find that the direct diffusion phenomena is a dominant factor in the formation of a homogeneous mixture at downstream of GDI spray especially in vaporizing conditions. As to increasing ambient temperature and increasing gasoline rate, the entropy intensity using the statistic thermodynamics method is increased because evaporation rate is higher gasoline than diesel.

양자펌프 억제제에 반응을 보이지 않은 인후두 역류질환 환자에서 고해상도 식도 내압검사의 분석

이창희,이현섭,진성민,이상혁,Lee, Chang-Hee,Lee, Hyun-Sub,Jin, Sung-Min,Lee, Sang-Hyuk 대한후두음성언어의학회 2011 대한후두음성언어의학회지 Vol.22 No.2

Background and Objectives : Laryngopharyngeal reflux disease (LPRD) originates from regurgitation of gastric contents to the laryngopharynx, and it is relatively common disease in otolaryngology. Proton-pump inhibitor (PPI) medication is frequently using treatment method in present time, but controversies exist regarding treatment for it. High-resolution manometry (HRM) system is a newly developed device that using 36 channels and pressure topography plotting program, checking the function and status of esophagus. The aim of this study was to evaluate clinical usefulness of HRM in LPRD patients who do not response to PPI medication. Subjects and Method : From July 2009 to July 2010, a total of 99 patients who were suspected LPRD according to symptoms (Reflux Symptom Index >13) and laryngoscopic findings (Reflux Finding Score >7) were retrospectively enrolled in this study. Patients were consisted of 31 men and 68 women, the mean age was 51.8 years, the mean BMI was 22.46. Patients have taken PPI medication for 2 months, after medication, they performed HRM. Comparative analysis was performed with results of the difference in symptoms. Results : In 99 patients, 37 patients (37.4%) show not improvement of LPRD symptoms after PPI medication. Among them, 18 patients (48.6%) showed abnormal findings that were classified as Peristaltic dysfunction (38.9%), Diffuse esophageal spasm (11.1%), Relaxation impairment of LES (11.1%), Achalasia (5.6%), Hypotensive LES (11.1%), Relaxation impairment of UES (11.1%), Nutcracker esophagus (5.6%), Decreased resting pressure (5.6%). Other 62 patients (62.6%) show improvement of LPRD symptoms, 23 patients (37.1%) showed abnormal findings. Most common finding was Peristaltic dysfunction (43.4%) More prevalent abnormal findings of HRM were found in patients who revealed no response to PPI medication (48.6% vs. 37.1%), but it does not reach the statistical significance. Conclusion : Although statistical significances is not showed, the difference observed in the frequency of HRM abnormal finding between response and no response for PPI medication. It has been estimated that HRM may be used to determine differential diagnosis in patients with LPRD. Further studies in lager population containing normal controls will be needed to prove clinical usefulness.

양자펌프 억제제에 반응을 보이지 않은 인후두 역류질환 환자에서 고해상도 식도 내압검사의 분석

이창희,이현섭,진성민,이상혁,Lee, Chang-Hee,Lee, Hyun-Sub,Jin, Sung-Min,Lee, Sang-Hyuk 대한후두음성언어의학회 2012 대한후두음성언어의학회지 Vol.23 No.1

Background and Objectives : Laryngopharyngeal reflux disease (LPRD) originates from regurgitation of gastric contents to the laryngopharynx, and it is relatively common disease in otolaryngology. Proton-pump inhibitor (PPI) medication is frequently using treatment method in present time, but controversies exist regarding treatment for it. High-resolution manometry (HRM) system is a newly developed device that using 36 channels and pressure topography plotting program, checking the function and status of esophagus. The aim of this study was to evaluate clinical usefulness of HRM in LPRD patients who do not response to PPI medication. Materials and Method : From July 2009 to July 2010, a total of 99 patients who were suspected LPRD according to symptoms (Reflux Symptom Index >13) and laryngoscopic findings (Reflux Finding Score >7) were retrospectively enrolled in this study. Patients were consisted of 31 men and 68 women, the mean age was 51.8 years, the mean BMI was 22.46. Patients have taken PPI medication for 2 months, after medication, they performed HRM. Comparative analysis was performed with results of the difference in symptoms. Results : In 99 patients, 37 patients (37.4%) show not improvement of LPRD symptoms after PPI medication. Among them, 18 patients (48.6%) showed abnormal findings that were classified as Peristaltic dysfunction (38.9%), Diffuse esophageal spasm (11.1%), Relaxation impairment of LES (11.1%), Achalasia (5.6%), Hypotensive LES (11.1%), Relaxation impairment of UES (11.1%), Nutcracker esophagus (5.6%), Decreased resting pressure (5.6%). Other 62 patients (62.6%) show improvement of LPRD symptoms, 23 patients (37.1%) showed abnormal findings. Most common finding was Peristaltic dysfunction (43.4%) More prevalent abnormal findings of HRM were found in patients who revealed no response to PPI medication (48.6% vs. 37.1%), but it does not reach the statistical significance. Conclusion : Although statistical significances is not showed, the difference observed in the frequency of HRM abnormal finding between response and no response for PPI medication. It has been estimated that HRM may be used to determine differential diagnosis in patients with LPRD. Further studies in lager population containing normal controls will be needed to prove clinical usefulness.

연습용 10-20 Electrode System을 이용한 뇌파검사 실습의 효율성과 만족도 평가

이창희,김대진,최정수,이종우,이민우,조재욱,김성욱,Lee, Chang Hee,Kim, Dae Jin,Choi, Jeong Su,Lee, Jong-Woo,Lee, Min Woo,Cho, Jae Wook,Kim, Suhng Wook 대한임상검사과학회 2017 대한임상검사과학회지(KJCLS) Vol.49 No.3

Electroencephalography (EEG) is distinct from other medical imaging tests in that it is a functional test that helps to diagnosis disorders related to the brain, such as epilepsy. The most important abilities for a medical technologist when performing an EEG are knowing the exact location of the electrode and recording the EEG wave clearly, except for artifacts. Although theoretical education and practical training are both included in the curriculum for improving these abilities, sufficient practical training has been lacking due to problems like expensive equipment and insufficient practical training time. We try to solve these issues by manufacturing the training 10-20 electrode system and by estimating the efficiency and satisfaction of the training 10-20 electrode system through a questionnaire. The time required for practical training using this system was $43.58{\pm}9.647min$, which proved to be efficient. The satisfaction score of participants who experienced curriculum practical training was improved from $7.21{\pm}2.285$ to $9.46{\pm}1.166$. Based on these findings, it is considered that practical training via the use of the training 10-20 electrode system will solve the problems, such as lack of equipment and insufficient practical training time. Nonetheless, to further improve the training 10-20 electrode system, it must overcome the limitations of developing a device capable of checking the actual brain waves and validating the exact location of electrode attachment.

일부 스티렌 폭로 근로자의 뇨중 대사산물과 신경행동학적 검사

이창희,문덕환,이헌,박준한,김대환,이종태,전진호,김휘동,이채언,Lee, Chang-Hee,Moon, Deog-Hwan,Lee, Hun,Park, Jun-Han,Kim, Dae-Hwan,Lee, Jong-Tae,Chun, Jin-Ho,Kim, Hwi-Dong,Lee, Chae-Un 대한예방의학회 1996 Journal of Preventive Medicine and Public Health Vol.29 No.4

In order to prepare the fundamental data for the health promotion by assessing the exposure level of styrene, the author determined the concentration of mandelic acid and phenylglyoxylic acid in urine of 42 workers who were exposed to styrene by high performance liquid chromatography and surveyed 16 symptoms, by questionnaire and also tested neurobehavioral test(digit symbol, benton visual retention) in 2 FRP plants of Kyung Nam area from July to September, 1995. Control was sampled by age sex matching method. The concentration of styrene in air was determined by gas chromatography. The results were as follows; 1. Geometric mean concentration of styrene in air was 17.4ppm, geometric mean concentration of mandelic acid(MA) in urine were 404.3mg/g creatinine for exposure group, 46.4mg/g creatinine for control group, geometric mean concentration of phenylglyoxylic acid(PGA) in urine were 57.5mg/g creatinine for exposure group, 9.5mg/g creatinine for control group. Mean concentration of MA and PGA showed statistically significant difference between exposure group and control group(p<0.01). 2. Number of symptom were 2.9 for exposure group, 3.3 for control group, number of digit symbol were 24.1 for exposure group, 32.5 for control group, number of Benton visual retention test were 6.1 for exposure group, 6.0 for control group, respectively. As result of adjusting the education year, number of Benton visual retention test showed statistically significant difference between exposure group and control group(p<0.05). 3. Excellent correlation were observed between environmental styrene exposure and urinary MA(r=0.80), PGA(r=0.73), and MA+PGA(r=0.81).

이종금속간 용접 계면에서의 미혼합역 형성

이창희,Lee, Chang-Hee 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.4

웹을 통한 원격제어 시스템

이창희,이광제,원영진,유희삼,Lee, Chang-Hee,Lee, Kwang-Je,Won, Yong-Jin,Ryu, Hee-Sahm 대한전자공학회 2002 電子工學會論文誌 IE (Industry electronics) Vol.39 No.3

본 논문에서는 이동하는 로봇을 제어하기 위한 웹 상에서의 시스템 구성을 논의한다. 즉, 웹에서의 제어 방법을 구체적으로 설명하고 실험한 결과를 나타내었다. 시스템은 서버 측에 있는 간단한 인터페이스를 엑세스하여 원격제어 한다. 이를 위해, 원격 사용자는 인터넷상에서 시스템을 원격으로 조절하기 위하여 www 브라우저가 설치된 범용 컴퓨터가 있어야 한다. 원격 사용자가 서버 측의 html파일을 구동하여 신호를 입력하면, 자바로 작성된 프로그램이 직렬포트에 연결된 기기를 구동한다. 원격제어 신호는 적외선 센서를 거쳐 라인트레이서에 전달되어 운행을 원격으로 제어한다. 웹에서의 시스템의 동작 확인을 위하여 시스템의 기기로는 라인트레이서를 사용하였다. This paper discusses the work-in-progress of a system to control a moving robot over the WWW(World Wide Web). That is, we describes the experimental results and control methods of system over the world wide web. The remote control of the system is controlled by accessing a simple form of interface that is connected to the server. For this application, a remote operator should have a general-purpose computer with Internet connection and a WWW browser to remotely operate the line-tracer through the Internet. As a remote operator summits an input by operating html files in the server, the program written in java is operated the equipment is being connected to the serial port. By being transmitted to the line-tracer through the infra-red sensor, the remote controlled signal is operated in distance. As a tool in order to identify the system's operation of the over the web is used the line-tracer.?

기록정보서비스를 위한 메신저 기반의 챗봇 프로토 타입 개발 연구: 명지대학교 대학사료실을 중심으로

이창희,이해영,김인택,Lee, Chang Hee,Rieh, Hae-young,Kim, Intaek 한국정보관리학회 2018 정보관리학회지 Vol.35 No.3

기록관의 역할이 커지고 있음에도 불구하고 아직 기록의 중요성에 대해 인지하지 못하는 잠재적 이용자가 많다. 이 연구에서는 이용자에 대한 기록정보서비스를 강화하기 위한 방법으로 기록관과 이용자의 상호작용을 지원하는 챗봇을 개발해보고자 하였다. 이에 챗봇의 구체적인 개발 절차와 방법을 살펴보고, 명지대학교 대학사 료실을 사례로 이용자 요구 및 질의 분석을 진행하였으며, 챗봇 개발을 위한 논리적 구조 설계를 진행하였다. 이어 IBM Watson Conversation과 카카오톡 메신저를 통해 챗봇을 구축한 뒤, 시험 실행(Pilot run) 과정을 통해 챗봇과 이용자의 상호작용 과정을 확인하였다. 이러한 기록정보서비스 챗봇 개발 경험을 바탕으로, 챗봇 도입을 위한 수준 결정, 이용자 요구 분석, 챗봇 구축을 위한 도구 선정, 대화식 상호작용을 위한 구문 설정과 관련된 시사점을 제시하였다. The role of archives and records centers is expanding, however many potential users are not aware of the importance of the records and archives. As a method to improve the archival information services to users, in this study, we developed chatbot that supports the interaction between the users and the archives and records centers. Thus we examined the specific development procedures and methods, analyzed user requests and questions of the archives and records center of Myongji university as a case, and conducted a logical structure design for chatbot development. After building the chatbot based on IBM Watson Conversation and Kakaotalk messenger, we were able to find how the chatbot interacted with the users through a pilot run. Based on the experience of developing information service chatbot, the implications related the introduction of the chatbot were suggested which include determination of the level of the chatbot, analysis of the user requests, selection of the tool for the chatbot, and syntax setting for the conversational interaction.

Mechanistic Studies for the Cyclization of t-Amine Substituted Anilines and Their Utilization to the Synthesis of Pyrrolo[1,2-a]benzimidazoquinone Derivatives

이창희,백호진,김국진,조규욱,오경택,Lee, Chang-Hee,Baik, Ho-Jin,Kim, Kuk-Jin,Cho, Kiu-Uk,Oh, Kyung Taek Korean Chemical Society 1995 대한화학회지 Vol.39 No.5

A few t-amine substituted anilines and amides were synthesized and cyclized to pyrrolo[1,2-a]benzimidazole by heating in various solvents having different polarity. Subsequent nitration of cyclized compound followed by reduction and oxidation of resulting amine afforded quinone such as 7 in 14% yield. The formation of imidazole moiety by thermal cyclization was independent on the solvent polarity. The regiochemistry for the nitration of 4 was unambiguously determined by chemical transformation.