푸아송 분포를 이용한 해상교통관제 구역 내 선박 상호간 교통위험 상황의 발생 간격 분석에 관한 연구

박상원,박영수,Park, Sang-Won,Park, Young-Soo 해양환경안전학회 2016 해양환경안전학회지 Vol.22 No.5

항만 및 연안의 관제구역 내에서는 VHF를 이용하여 24시간 해상교통관제가 이루어지고 있다. 그러므로 VHF 교신을 분석하면 관제구역 내의 선박 움직임이나 관제사의 관제패턴을 확인할 수 있다. 따라서 본 연구에서는 VHF 교신분석으로 관제사가 관제구역 내 위험상황을 관제하는 간격을 도출하고 관제 가이드라인 및 위험한 상황을 사전에 대비할 수 있는 기초 자료로 제공하고자 한다. 이를 위하여 부산항을 대상으로 7일간 VHF 교신을 청취하고, VTS가 직간접적으로 관제한 선박에 대하여 Park 모델을 이용하여 위험도를 도출하였다. 이를 이용하여 단위시간당 일정 위험도 이상의 선박을 관제하는 빈도확률이 푸아송 분포를 따르고 있음을 확인하였고, 그 결과 VTS가 선박을 직접 관제에 개입할 경우는 3.50시간마다, 특히 주간시간대의 경우 2.85시간마다 관제하는 것으로 분석되었다. 그리고 3.84시간마다 일정 위험도 이상의 선박간의 교신이 있음을 확인하였다. Vessel traffic servies (VTS) control movements in ports and coastal areas 24 hours a day using VHF. Thus, we were able to check ship movements and the patterns followed by VTS officers in VTS areas using VHF communication analysis. This study is intended to identify control intervals for dangerous situations and provide VTS officers with basic data and guidelines to prevent these occurrences in advance. We listened to Busan port's VHF communication for seven days and obtained risk values using the Park model with reference to controlled ships. The probability of a dangerous situation arising under a controller's watch per unit of time was confirmed to follow a Poisson distribution. As a result, for each 3.50 hours that VTS directly controls an area, (and in daytime for each 2.85 hours) a ship communicates in a VTS area every 3.84 hours, and some of there communications exceed certain risk values in VTS areas.

상수도와 동

박상원,Park, Sang-Won 한국상하수도협회 1989 水道 Vol.49 No.-

미소 전류 자극이 TPS-IMZ 임프란트 주위의 골유착과 골형성에 미치는 영향

박상원,양홍서,Park, Sang-Won,Yang, Hong-So 대한치과보철학회 1996 대한치과보철학회지 Vol.34 No.4

The purpose of this study is to investigate the effect of constant direct current electrical stimulation in healing the bone defects and surrounding tissues of the endo-oseous(TPS-IMZ) implants. Implants were inserted in the femur of adult dogs. Then a constrant direct current of approximately $10{\mu}A$ was applied. Artificial bone defects were prepared on one side of the implant site. Experimental groups were divided into 4 : control group : bone defect without treatment group I : bone defect filled with hydroxyapatite powders group II : bone defect, in which a negative and positive electrodes were inserted 5mm apart from both sides of the implant group III : bone defect, in which negative current was directly connected to the IMZ implant and a positive electrode was placed 10mm apart from the implant The animals were sacrificed in the 1st, 2nd, 4th and 8th week after implantation for the light microscopic examination. The results obtained were as follows : 1. In electrically stimulated experimental groups, new bone formation and osseointegration around implants were accelerated. 2. Group III showed the greatest activity in new bone formation. Osteoconductivity around HA particles was observed in group 1. 3. The defect area of the control group was healed by forming new bone, which grew from the underlying cancellous bone. The defect areas of the electrically stimulated experimental groups were healed by newly formed bone, which grew upward from the cancellous bone and downward from the periosteum. 4. 8 weeks after implantation, all the groups showed good osseointegration between the surrounding bone and implants.

한국경제의 미래와 비전

박상원,Park, Sang-Won 한국인삼전략화협의회 2005 인삼·약초 Vol.3 No.6

정부의 양극화 해소방안에 대하여 2

박상원,Park, Sang-Won 한국인삼전략화협의회 2006 인삼·약초 Vol.4 No.3

정부의 양극화 해소방안에 대하여

박상원,Park, Sang-Won 한국인삼전략화협의회 2006 인삼·약초 Vol.4 No.2

와송약침액(瓦松藥鍼液)이 신장세포(腎臟細胞)에서 H₂O₂에 의한 세포사망(細胞死亡) 및 DNA 손상(損傷)에 미치는 영향(影響)

박상원,송춘호,Park, Sang-Won,Song, Choon-Ho 대한침구의학회 2001 대한침구의학회지 Vol.17 No.4

Objectives : This study was performed to determine if Orostachys japonicus A. Berger aquacupuncture (OjB) provides the protective effect against the loss of celi viability and DNA damage induced by oxidant in renal proximal tubular cells. Methods : The cell viability was evaluated by a MTT reduction assay and DNA damage was estimated by measuring double stranded DNA breaks in opossum kidney (OK) cells, an established proximal tubular cell line. Lipid peroxidation was determined by measuring malondialdehyde (MDA), a product of lipid peroxidation. Results : $H_2O_2$ increased the loss of cell viability in a time-dependent manner, which were prevented by 0.1% OjB. The protective effect of OjB was dose-dependent over concentration range of 0.05-0.5%. $H_2O_2$ caused ATP depletion and DNA damage, which were prevented by OjB and the hydrogen peroxide scavenger catalase. The loss of cell viability by $H_2O_2$ was not affected by the antioxidant DPPD, but lipid peroxidation by the oxidant was completely inhibited by DPPD. Conclusions : These data suggest that $H_2O_2$-induced death results from a lipid peroxidation-independent mechanism and the protective effect of OjB is not associated with its antioxidant activity.

XML 데이터베이스 지원을 위한 통합 환경

박상원,민경섭,김형주,Park, Sang-Won,Min, Kyung-Sub,Kim, Hyoung-Joo 한국정보과학회 2000 정보과학회 컴퓨팅의 실제 논문지 Vol.15 No.11

웹에서 정보 전달의 수단으로 등장한 XML은 많은 응용 분야에서 사용될 것이다. 많은 양의 XML 문서를 효율적으로 다루기 위하여 데이타베이스의 지원은 필수적이다. 데이터베이스를 이용하여 XML 데이타를 처리할 때 데이타베이스이 종류뿐만 아니라 그 인터페이스도 중요한 문제이다. 본 논문에서는 관계형 데이터베이스, 객체지향형 데이터베이스 및 랩포를 이용하여 XML 데이타를 저장, 질의하며 그 인터페이스로 XML-뷰, ODMG C++바인딩, OQL, DOM을 사용하였다. 또한 각각의 시스템의 구현을 통하여 각 방법들의 장단점을 논하고, 효율적인 XML 문서 처리에 대한 방법을 제시한다. XML will be used in lots of areas in the Web environment as a method of information exchange, We have to use dat'abases to manipulate lots of XML documents efficiently, When we use database to manipulate XML, not only type of database but also its interface is important We develop a system using relational database, object-oriented database and wrapper to store XML data, of which interfaces are XML-View, ODMG C++ binding, OQL and DOM, We discuss pros and cons of each method by the implementation of the system, and propose an efficient manipulation method of XNIL documents.

공기조화용 버터플라이 밸브 하류에서의 3차원 유동특성

박상원,이상우,Park, Sang-Won,Lee, Sang-Woo 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.2

Oil-film flow visualizations and three-dimensional flow measurements have been conducted in the downstream region of a butterfly-type valve used in air-conditioning systems, with the variation of a disk open angle. The flow visualizations in the flow symmetry plane show that there are a pair of counter-rotating separation/recirculation zones as wall as two jet-like near-wall flows. These flow disturbances are strongly depends on the disk open angle. Based on the flow visualization, a qualitative flow model is suggested in the near-field and downstream region of the valve disk. For a small disk open angle, the mean velocities and turbulent intensities have relatively small values in the near-field of the valve disk, but they do not show uniform distributions even in some downstream region. With an increment of the disk open angle, mean velocity variations and turbulent intensities are greatly increased in the immediate downstream region, but uniform distributions are quickly resumed as departing from the valve disk. The mass flow rate remains nearly constant for the disk open angles less than 30 degrees, meanwhile it strongly depends on the disk open angles between 45 and 75 degrees. The pressure loss is found to be about zero for the disk open angles less than 45 degrees, but is substantially increased for those larger than 75 degrees.

2006년 한국경제 전망

박상원,Park, Sang-Won 한국인삼전략화협의회 2006 인삼·약초 Vol.4 No.1