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.

설비 결함 식별 최적화를 위한 오토인코더 기반N 분할 주파수 영역 이상 탐지

박기창,이용관 한국정보처리학회 2024 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.13 No.3

제조 분야 설비 예지보전을 위해서 진동, 전류, 온도 등 물리 데이터를 기반으로 설비 이상을 탐지하는 인공지능 학습 모델이 활용되고 있다. 설비 결함, 고장 등 설비 이상 유형은 매우 다양하므로, 주로 오토인코더 기반 비지도 학습 모델을 이용한 이상 탐지 방법이 적용되고 있다. 설비상태의 정상, 비정상 여부는 오토인코더의 재구성 오차를 이용해 효과적으로 분류할 수 있지만, 설비 이상의 구체적인 상태를 식별하는 데 한계가있다. 설비 불균형, 정렬 불량, 고정 불량 등 설비 이상 상황 발생 시, 설비 진동 주파수는 특정 영역에서 정상 상태와 다른 패턴을 나타낸다. 본 논문에서는 전체 진동 주파수 범위를 N개 영역으로 나누어 이상 탐지를 수행하는 N 분할 이상 탐지 방법을 제시하였다. 압축기의 진동 데이터를이용해 주파수와 강도를 달리한 9종의 이상 데이터를 대상으로 실험한 결과, N 분할을 적용하였을 때 더 높은 이상 탐지 성능을 나타냈다. 제안방법은 설비 이상 탐지 이후, 설비 이상 구체화에 활용될 수 있다 Artificial intelligence models are being used to detect facility anomalies using physics data such as vibration, current, and temperaturefor predictive maintenance in the manufacturing industry. Since the types of facility anomalies, such as facility defects and failures, anomalydetection methods using autoencoder-based unsupervised learning models have been mainly applied. Normal or abnormal facilityconditions can be effectively classified using the reconstruction error of the autoencoder, but there is a limit to identifying facility anomaliesspecifically. When facility anomalies such as unbalance, misalignment, and looseness occur, the facility vibration frequency shows a patterndifferent from the normal state in a specific frequency range. This paper presents an N-segmentation anomaly detection method thatperforms anomaly detection by dividing the entire vibration frequency range into N regions. Experiments on nine kinds of anomaly datawith different frequencies and amplitudes using vibration data from a compressor showed better performance when N-segmentation wasapplied. The proposed method helps materialize them after detecting facility anomalies.

외상후 스트레스 장애의 정신생물학적 접근

박기창,Park, Ki-Chang 한국정신신체의학회 1996 정신신체의학 Vol.4 No.1

As the society becomes more industrialized and modernized, we have more chances to experience a serious traumatic event. Post-traumatic stress disorder (PTSD) has 3 major categories of symptoms such as memory disturbance, hyperarousal and avoidance or numbness. I reviewed the psychobiological evidences in 3 main categories of symptoms and the biological treatment after a brief review of the epidemiology, psychosocial etiology and diagnosis of PTSD. The memory disturbance of PTSD might be developed by the potentiation of the memory pathway mediated by norepinephrine. PTSD induces HPA axis abnormality, it might also develop hippocampal dysfunction, which might contribute to the memory disturbance. The kindling effect develops desensitization, which might develop reexperiencing of the traumatic events and hyperarousal state. Chronic aroused state of locus ceruleus with resultant chronic maladaptive state of norepinephrine system, might develop hyperarousal state. Social avoidance and physical numbing state in PTSD might be caused by serotnin or opiate system. Stress induced analgesia might be developed by opiate reliesed against the acute stress. The biologic research results would help the selective treatment of PTSD.

콘크리트충전 강관기둥의 내화실험에 대한 고찰 -재하가열실험후의 강관 및 콘크리트 화재손상평가를 중심으로-

박기창,최성모,김동규,Park, Ki-Chang,Choi, Sung-Mo,Kim, Dong-Kyu 한국강구조학회 2000 韓國鋼構造學會 論文集 Vol.12 No.6

본 연구는 화재발생후에 시간경과에 따른 콘크리트충전 강관기둥의 내력변화를 파악하고 인장강도시험을 통해 내화실험이전과 후의 항복강도, 인장강도, 평균연신율 및 탄성계수 등에 대하여 각 단계별 하중에 따른 변형률을 비교측정하였다. 화재를 입은 강관내의 충전콘크리트의 물성변화(압축강도 및 탄성계수시험)를 파악하기 위하여 화재실험후 강관중심부에서 코아시험체를 채취하여 압축강도를 측정하고 탄성계수의 측정은 응력에 의한 변형률을 측정하였으며, 대상실험체의 화재온도를 추정하기 위하여 시차열분석을 실시하였다. 이러한 실험결과로부터 얻어진 자료를 평가하여, 향후 콘크리트 충전강관의 내화설계 구조규준제정에 필요한 기초자료를 제시하는데 그 목적이 있다. In this study, the time dependent internal stress changes of a Concrete Filled Steel Tube(CFT) column during a fire test were quantitatively analyzed. The strain ratio of a CFT column on the different loads was measured by tensile strength tests in terms of yield strength, tensile strength average extensibility and elasticity modulus. To understand the internal material properties change of concrete in CFT column damaged due to a fire, the compressive strength and elastic modulus tests were measured on a core sample from the center of the steel tube after the fire test. The elastic modulus test measured the strain from the stress. To determine the fire temperature of the test material, a differential thermal analysis was done. From the tested result, the gained data were conducted and an analysis method was suggested. The purpose of this work is to suggest a basic data for structure regulation enactments of the internal fire design of CFT.

긴장형 정신분열증으로 진단되었던 일본뇌염환자 1예

박기창,김신태,박진한,안정숙,신정호 연세대학교 원주의과대학 1992 원주의대논문집 Vol.5 No.1

우울한 기분을 동반한 정신과환자의 Dexamethasone Suppression Test에 관한 연구

박기창,신정호,강봉성,조인혜 연세대학교 원주의과대학 1988 원주의대논문집 Vol.1 No.1

외상성 뇌손상이후 발생하는 외상후 스트레스장애와 급성스트레스 장애의 평가 및 치료

박기창,Park, Ki-Chang 대한생물정신의학회 1995 생물정신의학 Vol.2 No.2

Traumatic brain injury(TBI) used to be developed after a severe traumatic event. Therefore TBI usually induces acute or chronic stress reaction. I reviewed the concept, epidemiology, biological or psychosocial etiology, diagnosis and treatment of post-traumatic stress disorder (PTSD), and discussed about PTSD or stress reaction after TBI. Early evaluation and management of stress reaction after TBI are important.

의학교육에 대한 바람

박기창,Park, Gi-Chang 연세대학교 의과대학 2000 의학교육논단 Vol.2 No.1

극심한 강박성 지연증상 환자의 치험 2예

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

두부외상후 우울증의 신경내분비적 소견

박기창,이규남,신정호 연세대학교 원주의과대학 1995 원주의대논문집 Vol.8 No.1