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朴炳卓,黃蹇興 대한신경정신의학회 1983 신경정신의학 Vol.22 No.3
The authors undertook a study of psychodynamics and general clinical aspects of 9 cases of adult male enuretics who were admitted during the period from May 1982 to April 1983 at the Department of Neuropsychiatry, Taegu Armed Forces General Hospital. The pertinent results are as follows: 1. In most of the cases, fathers were rather strict, rigid or weak. Therefore they were not adequate objects of identification for the enuretics. 2. Primary enuretics were overprotected by their mothers and showed lacks of autonomy and independence and were childish and immature. 3 . In the secondary enuretics, mothers were more rigid or strict, so they became the objects of fear to the subjects. Some of the secondary enuretics suffered transient separation from their parents and showed highly neurotic tendencies of hostility, depression or anxiety.
초기 수도권 UAM 실증노선 예상 수요에 따른 버티포트 성능 연구
박병탁,김현미,김상현 대한교통학회 2021 대한교통학회 학술대회지 Vol.85 No.-
국토교통부가 2020년 발표한 K-UAM 로드맵은 UAM 상용화 초기인 2025년 김포공항-코엑스, 인천공항-코엑스 실증노선을 제시하고 있다. 이에 따라 본 연구는 2025년 김포공항-코엑스 노선의 UAM 수요 예측 및 버티포트 수용량 분석을 바탕으로 버티포트의 성능을 평가하였다. 먼저 선행 연구에서 제시한 수단선택 모형을 활용하여 UAM의 수단분담율을 추정하였고, KTDB에서 제공하는 기종점 통행량을 적용하여 오전 첨두시 UAM 통행량을 계산하였다. 다음으로 버티포트 수용량을 결정하기 위해 FATO, 유도로, 게이트의 수용량을 분석하였으며, 코엑스 버티포트의 경우 게이트가 8개 이하이면 게이트의 수용량이 버티포트 수용량을 제한함을 보였다. 앞에서 구한 김포공항-코엑스 노선의 UAM 통행량과 버티포트 수용량을 복수 서버를 갖는 대기행렬모형에 적용하여 게이트 개수에 따른 UAM의 평균 대기시간을 계산하였다. 그 결과 김포공항-코엑스 노선의 초기 UAM 수요를 대응하기 위해서 게이트가 최소 2개 이상이 필요함을 보였다.
Vertiport Performance Analysis for On-Demand Urban Air Mobility Operation in Seoul Metropolitan Area
박병탁,김현미,김상현 한국항공우주학회 2022 International Journal of Aeronautical and Space Sc Vol.23 No.5
This paper presents a methodology to evaluate the vertiport performance by analyzing the average waiting time for electric vertical take-off and landing (eVTOL) vehicles to use the vertiport. A series of analytical processes for vertiport design, demand prediction, and performance analysis is presented. To design the vertiport layout, we propose a novel algorithm that evaluates the surrounding obstacles by considering current regulations. The potential demand for air taxi services by urban air mobility (UAM) as multimodal transportation is predicted by a discrete choice model that estimates the probability of choosing an air taxi service given the time saving of UAM. Then, the sensitivity of demand was analyzed for the catchment area, travel cost, and the number of passengers on board. The sensitivity analysis showed that the demand for UAM was sensitive to all factors considered. Vertiport performance is evaluated by comparing the expected number of operations derived from the UAM demand to the vertiport capacity. The proposed methodology was applied to a vertiport in the Seoul metropolitan area for the initial UAM operations. The results show that having one less gate significantly increases the waiting time of the UAM when the utilization factor of the waiting queue is high. However, the average waiting time is less than 20 min (the maximum hover time of eVTOL vehicles) if the vertiport has a sufficient number of gates, depending on the traffic volume of UAM. Therefore, it is essential to determine the number of gates considering the expected traffic volume to ensure safe UAM operations.
朴炳卓 大韓神經精神醫學會 1978 신경정신의학 Vol.17 No.3
The pressing need to study the prevention as well as the nature and cause of delinquent behavior has yielded some studies on the family dynamics and some theoretical review, but scanty systematic works on parental loss. In the present study, the author attempted to study their parental loss by death and seperation, other serious parental problems and the parental surrogate after loss. For the above purpose, the author distributed questionaires to 380 male delinquents in a "T" juvenile reformatory near Taegu area during September, 1977. As control groups, he selected at random the same number of psychiatric patients and students respectively matched by age and sex. The results could be summarized as follows; The mean age of delinquents was 17.5 years, 18 being the most common. The educational level and the economic status of the delinquent group was much lower than those of the control groups. The incidence of the parental loss by death and separation, and other serious parental problems was prominently higher (65%) in delinquents; being twice as high as the patient group and five times that of the student group. Among parental loss and other parental problems, paternal defect was more frequent than maternal defect. Considering the over-lapping of parental loss and other problems seen in the same delinquents in about (25%) of the group, the seriousness of parental problems seems to be quiet impressive. As to the rate of early parental loss by death, only 12% of all deliquents lost one or both parents before reaching the age of 5. However, the rate of maternal loss in this period was relatively higher in this group, compared with that of control groups. In an analysis of after care by parental surrogates in the parental loss group, the study group tended to be reared by non-blood relatives, while in both control groups they were rather closely cared for by immediate relatives. Lastly, there was no significant difference in the types of delinquent behavior between delinquents from broken homes and non-broken homes.