비지도학습 기반 복합 구동시스템 이상 탐지

박기창,이용관 한국정밀공학회 2023 한국정밀공학회지 Vol.40 No.11

Anomaly detection models using big data generated from facilities and equipment have been adopted for predictive maintenance in the manufacturing industry. When facility faults or defects occur, different patterns of abnormal dataare shown owing to their component behaviors. By detecting these pattern changes, it is possible to determine whether a facility abnormality occurs. This study evaluated the anomaly detection results from a combined driving system consisting of three driving motors for about six months at a manufacturing site. The learning data with an autoencoder model for about a month at the beginning of vibration data collection and continuous monitoring of anomalies using reconstruction errors showed that a component defect occurred in one driving motor, and the reconstruction error increased progressively about three months earlier than a facility manager found the failure. In addition, the micro-electro-mechanical systems sensor showed high amplitude in the entire frequency domain when high reconstruction errors occurred. However, the integrated electronics piezoelectric sensor showed different patterns as high amplitude in a specific frequency domain. The results of this study will be helpful for detecting facility abnormalities in combined driving systems using vibration sensors.

J2ME MIDlet 사용자 인터페이스 자동생성을 위한 XML언어

박기창,서성채,김병기,Chang, Park-Ki,Seo, Seong-Chae,Kim, Byung-Ki 한국정보처리학회 2008 정보처리학회논문지D Vol.15 No.3

XML을 이용한 사용자 인터페이스(UI : User Interface)명세에 관한 연구로 다양한 UI 명세언어(UIDL : User Interface Description Language)들이 등장하였다. 기존의 UIDL들은 웹과 데스크톱 어플리케이션의 UI 명세를 지원하지만, 모바일 어플리케이션을 위한 명세는 지원하지 않는다. 본 논문에서는 자바의 모바일 플랫폼인 J2ME(Java Platform, Micro Edition)의 응용 모델인 MIDlet UI 명세를 위한 MIML(Midlet Interface Markup Language)을 제안한다. 제안한 MIML로부터 MIDlet의 UI와 관련된 자바 코드를 자동으로 생성하기 위한 규칙을 제안하고, 이를 이용하여 MIML을 자동으로 자바코드로 만들어주는 J2MERenderer를 구현하였다. 제안한 MIML은 모바일 UI 명세의 효율성을 제공하고, J2MERenderer는 모바일 어플리케이션의 UI 개발에 생산성과 일관성을 유지하도록 도와준다. Many XML-compliant UIDLs(User Interface Description Languages) have been developed to specify user interfaces. Although previous UIDLs are helpful to describe user interfaces of web and desktop applications, they are not available of developing UI of mobile applications. In this paper, in order to effectively specify user interfaces of MIDlet which is application model on J2ME(Java Platform, Micro Edition), we propose MIML(Midlet Interface Markup Language) and present transformation rules to generate source codes from MIML. Further, we enhance the usability of MIML through J2MERenderer which is a tool using presented rules. The proposed method can specify user interfaces of mobile applications and allow developers to keep productivity and consistency in development phase.

교육혁신과 교육매체 활용

朴基昌 陸軍士官學校 1982 한국군사학논집 Vol.23 No.-

Changes in society usually bring changes to its institutions, including education. One of the greatest challenges to teaching arises from the current rapid expansion of knowledge. The theacher's chief job has been changed as diagnosticians and organizers, or managers of functionally varied learning experience. So a problem of promary importance for teachers is to keep to data on new knowledge, and the professional teacher must know and use dependable sources of information about available materials and develop skills in applying criteria to assess their accuracy and validity. I suggest the ways in which teachers may develop essential skills and knowledge to meet these many changing requirements. I introduced utilization unique advantage of the medium-VTR, computer and teaching machine, projected media, and multi-Image, multi-media package.

Dick & Carey의 교수설계 모형을 적용한 투상도 프로그램 개발

박기창 이화여자대학교 대학원 1993 硏究論叢 Vol.25 No.-

Doxepin이 가토 혈중 주정농도에 미치는 영향에 관한 실험적 연구

박기창 大韓神經精神醫學會 1982 신경정신의학 Vol.21 No.3

Doxepin is a tricyclic antidepressant and is a derivative of dibenzoxepine, which is known to be effective in depressed patients, showing anxiety and sleep disturbance. The author conducted an animal experiment to investigate the effects of this antidepressant on blood alcohol level, because many investigators have suggested that any new psychotropic drup should be tested for their interaction with alcohol. The expermient was done on mature rabbits of both sexes. The control group was given alcohol alone, and the experimental groups were given not only alcohol but also various oral doses of doxepin, namely, 10mg/kg for 5 days, 10mg/kg for 10 days, 25mg/kg for 5 days, and 25mg/kg for 10 days, respectively. The last dose was given one and a half hour before alcohol administration. In all groups, 5.0ml/kg of 20% ethanol solution was given intravenously and at 15 and 45 minutes after alcohol injection, blood specimens were obtained by cardiac puncture. The blood alcohol levels were determined by Cavett's method. Doxepin, when administered orally in a dose of 10mg/kg of body weight daily for 5 or 10 days, did not change the blood alcohol level significantly at both 15 and 45 minutes after alcohol administration, but when administered orally in a dose of 25mg/kg of body weight daily for 5 or 10 days, elevated the blood alcohol level significantly at both 15 and 45 minutes after alcohol administration. It is concluded that doxepin elevates the blood alcohol level in rabbits at a high dose.

두부외상후 심리사회적 예후

박기창,김헌주,Park, Ki-Chang,Kim, Hun-Joo 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.2

Objective : This study was designed to evaluate the relationship between the initial neurosurgical or psychosocial factors and the psychosocial outcome. Patients and Methods : We analyzed 123 head-injured patients who were referred to the department of psychiatry for the evaluation of psychosocial function. We analyzed initial neurosurgical variables such as Glasgow Coma scale(GCS) score, skull fracture, CT finding, and psychosocial outcomes with regards to psychosis, personality change, depression, anxiety and IQ on Intelligence Scale. Results : Patients with mild head injury(GCS score 13-15, N=94, 76.4%) had better recovery rate on Glasgow Outcome Scale(GOS), less personality change than those with moderate or severe head injury. However, depression, anxiety and intelligence were not significantly different between two groups. The skull fracture(N=37, 30.1%) did not influence on the psychosocial outcome with reference to personality change, depression, anxiety and intelligence. The patients with abnormal CT findings(N=64, 52%) had lower recovery rate on GOS, more frequent tendency in psychosis, personality change and severe depression, less frequent in anxiety and mild depression, than patients with normal CT finding. However, levels of intelligence were not different between two groups. The patients with industrial accidents(IA) had lower educational level, milder head injury, more delay for the psychiatric evaluation (longer treatment period) than those with motor vehicular accidents(MVA). The psychosocial outcome with reference to personality change, depression, anxiety, intelligence were not different between two groups. Conclusion : These findings indicate that the more severe initial trauma, the poorer psychosocial outcome. However, it was frequently observed that patients with mild head injury suffered from mild anxiety and depression. Therefore mild head injury appeared to be more complicated by psychosocial stressors. The patients with IA, despite the fact that initial head injury was mild, required longer treatment period than MVA.

일 환경치료 병실에서의 보호실 이용에 관한 고찰

이상일,신정호,박기창 大韓神經精神醫學會 1991 신경정신의학 Vol.30 No.2

This study was designed to investigate the contemporary use of seclusion in psychiatric inpatients. All of the secluded patients who had been admitted to the department of psychiatry of Wonju Christian Hospital. Yonsei University Wonju Medical College, from January 7th until July 7th in 1989, were included in this study. Filling up the check-list and bed side interviews were done at the time of seclusion with regard to some aspects of the use of seclusion. Comparison between secluded and non-secluded revealed below; 1) Seclusion was used at some point during hospitalization once or more in 61 patients(36.6%) among 167 patients. 2) The number of times that seclusion was used ranged from 1 to 11(mean 3.79 ±7.32. P〈0.05). 3) By age distribution, more seclusion was used in younger age group(P〈0.05). 4) By marital status, singles(67.2%) were secluded more frequently than the married(32.8%)(P〈0.05). 5) With regard to admission mode, patients with compulsory admission(80.3%) were secluded more frequently than the voluntary ones(19.7%) (P〈0.05). 6) The duration of hospital stay of secluded group were 55±34.14 and was significantly longer in the secluded group than non-secluded group(30±27.8), (P〈0.05). 7) Both manic(34.4%) and schizophrenic(23.0%) patients were found more in the secluded group than non-secluded group(P〈0.01, P〈0.05 respectively). Comparison between psychotics and non-psychotics revealed below; 1) Other staffs(82.3%) predicted seclusion more readily than doctors did (P〈0.05). 2) Seclusion was administered more frequently during night time in psychotic groups, compared to non-psychotic groups(P〈0.05). 3) The most common reason for seclusion was `behavior disruptive to the therapeutic environment(45.2%)'. The rest of the reasons were `uncontrolled symptom(38.4%)' `violent behavior(23, 25.0%)' in psychotics. In non-psychotics, behavior treatment(16.7%) was the most frequent cause(P〈0.05). 4) In psychotic group, duration of seclusion revealed more than 24 hours 32.3%, and in and 4 - 12 hours in 25.0%. 5) For other treatment modalities, use of medications(46.4%) and use of physical restraint(22.0%) were frequently done in psychotics, but in non-psychotics, simple isolation(32.4%) and interview(32.4%) were common(P〈0.05).

주정중독 입원환자의 다이설피람요법에 관한 예비연구

안정숙,강봉선,신정호,박기창 大韓神經精神醫學會 1989 신경정신의학 Vol.28 No.3

This study was conducted to investigate the effect of disulfiram on Korean alcoholics, and to evaluate the clinical applicability of disulfiram therapy as an aversive conditioning technique. In twelve alcoholic inpatients, the alcohol challenge test was carried out after loading 500mg/day of disulfiram for 7 days. During the alcohol challenge test, blood was sampled twice, before alcohol ingestion and at the maximal disulfiram-acetaldehyde reaction. Blood-alcohol concentration was measured by enzymatic analysis technique. The severity of aversive reaction was scaled subjectively by the patient. The results are as follows : 1) Side effects of disulfiram were mild and could be considered mostly manifestations of mental or physical predisposition of the alcoholic patient, and disappeared after reducing the dosage. 2) The severity of disulfiram-acetaldehyde reaction was negatively correlated to body weight under given loading dose of disulfiram and given challenging dose of alcohol. 3) Most of the disulfiram-acetaldehyde reaction was self-limited within 2 hours leaving no sequela. 4) Blood-alcohol concentration at the maximal aversive reaction was average 25.3mg/dl(range 21-49mg/dl), and not related to the subjective ratings of the aversive reaction. 5) On the telephone follow-up interview with spouses of the patients, 11 patients were identified, 8 of them(74%) had been abstinent for 3-16 months with only 5 patients on disulfriam maintenance. The other 3 patients had been abstinent for 6-15 months without disulfiram maintenance and regular follow-up after discharge. 6) Therapeutic success of abstinence was significantly correlated with the severity of aversive reaction in alcohol challenge test(p<0.1), but not with the total number of test(p>.05). From this study, we may conclude that disulfiram therapy under medical supervision is not so dangerous as we have concerned and we would suggest that the disulfiram therapy is applicable as an aversive conditioning technique.

극심한 강박성 지연증상 환자의 치험 2예

박기창,신정호,안정숙,박진한,이규남 연세대학교 원주의과대학 1993 원주의대논문집 Vol.6 No.1

학습이론과 매체활용에 관한 고찰

박기창 陸軍士官學校 1995 한국군사학논집 Vol.48 No.-

Since the 1980's there has been a movement toward a critical reflection on both the limitation and the power of learning theory itself. The purpose of this study is to review of the theoretical trends and issues of learning theory, particularly the implications of instructional system design and the media utilization(multimedia, virtual reality) of the constructivism. Several problems in relation to instructional system design and the media utilization could be identified. The major problems among these were 1)limits of media and facilities, 2)limits of experts and good software, 3)difficulties of application in the classroom. In order to tackle these problems a more coherent management of, and a stronger support for the teacher re-education and planning for educational technology use on the national level are recommended.