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선박 레이더 영상신호를 이용한 파랑정보 검출에 관한 연구
송재욱,김창제,문성배 한국항해항만학회 2003 한국항해항만학회지 Vol.27 No.6
This paper describes the system for evaluating the sea wave informations such as wave direction and wave length in real time, by using image data obtained from the marine X-band radar. We proposed here a method for automatic selection of the partial image data without the user's individual selection at the radar. We also discussed that the wave direction could be obtained by a 2-dimensional discrete Fourier transform algorithm. We carried some evaluation works on the algorithm through computer simulation. The obtained thirteen radar image data under several sea surface conditions were analyzed by the method described and the result was presented. 본 연구는 선박용 레이더로부터 디지털 신호처리보드를 통하여 영상신호를 획득하고, 일련의 디지털 신호처리 및 영상신호 분석을 통하여 선박에서 실시간으로 파향 및 파장 등의 파랑정보를 측정하기 위한 기법을 개발하고자 하는 것이다. 본 논문에서는 영상신호 분석영역을 사용자가 직접 설정하는 기존의 방법을 개선하여 분석영역을 자동으로 설정하는 기법 및 2차원 이산 푸리에 변환을 이용한 파향분석 알고리즘에 대하여 논하였다. 그리고, 컴퓨터 시뮬레이션을 통하여 파향분석 알고리즘의 유효성을 검증하였고, 기초실험으로 다양한 해상환경에서 X밴드 레이더로 획득한 13개의 영상신호에 대하여 파향정보 분석 결과를 예시하였다.핵심용어 : 선박용 X밴드 레이더, 영상신호 분석, 분석영역, 파향정보, 2차원 이산 푸리에 변환
송재욱,오재민,정명균,Song, Jae-Wook,Oh, Jae-Min,Chung, Myung-Kyoon 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.6
The optimal design code of an axial flow pump has been developed to determine geometric and fluid dynamic variables under hydrodynamic as well as mechanical design constraints. The design code includes the optimization of the complete radial distribution of the geometry by determining the coefficients of 2$^{nd}$ order polynomials to represent the three-dimensional geometry. The optimization problem has been formulated with a nonlinear multivariable objective function, maximizing the efficiency and stall margin, while minimizing the net positive suction head required. Calculation of the objective function is based on the mean streamline analysis and through-flow analysis using the present state-of-the-art model. The optimal solution is calculated using the penalty function method in which the genetic optimizer is employed. The optimized efficiency and design variables are presented in this paper as a function of non-dimensional specific speed in the range, 2$\leq$ $n_{s}$ $\leq$10. The results can be used in preliminary design of axial flow pumps.
포항항 항로지정을 위한 해상교통조사 분석 및 통항 특성에 관한 연구
송재욱,이윤석,박영수,강정구,정민,정창현 한국항해항만학회 2005 한국항해항만학회지 Vol.29 No.9
The traffic volume will be increased and the traffic of larger vessel could be multiplied in the Pohang port by the opening of the Young-il new port in 2006. Unfortunately, however, potential danger factors to the safe navigation, disordered navigation and traffic congestion are still existing in the Pohang port and approaching waters. This paper describes the status of marine traffic flow and navigational characteristics based on the marine traffic survey using the exclusive software, and the results of marine traffic survey classify into ship's type, size and track history of passing ships through the statistical methods. Finally the examinations of marine traffic route, traffic flow and navigational characteristics are discussed. These results can be used for the best design of ship's routing at the Pohang waters. 2006년 영일만 신항이 개장될 경우 포항항 진입 수역은 선박 통항량이 증가하고 중대형 선박들의 입출항이 가속화될 것이다. 그러나 포항항 일부 진입 수역에는 여전히 항행 위험 요소가 존재하고 있다. 즉, 호미곶 인근 해역에서의 무질서한 항행 및 교통이 폭주하고 있어 통항안전성을 고찰하기 위하여 해상교통조사를 실시하였다. 또한 해상교통조사 결과를 선종별 및 톤수별로 통계 처리하고 통항 선박의 항적 분포 등을 토대로 통항 선박의 주요 통항로 및 통항 특성을 분석하였으며, 향후 포항항 진입 수역의 항로지정에 활용하고자 한다.
측뇌실내 Digitalis가 가토 순환기계 기능에 미치는 영향
송재욱,강삼석,우정현 대한신경외과학회 1989 Journal of Korean neurosurgical society Vol.18 No.2
Influences of intracerebroventricular(icv) ouabain on cardiovascular system and on pressor response to raised intracranial pressure(ICP) were investigated in urethane-anesthetized rabbits. Intravenous(iv) 40㎍/㎏ ouabain did not affect blood pressure of rabbit. Icv ouabain(5, 10, 20㎍/㎏) and digoxin(6.25, 12.5㎍/㎏) produced dose-dependent pressor responses and marked decrease of heart rate. After bilateral vagotomy, the bradycardiac effect of ouabain disappeared, while the pressor effect was significantly potentiated. The ouabain-induced pressor effect was not affected by iv and icv phentolamine or propranolol, and significantly inhibited by icv infusion of lidocaine(0.1㎎/㎏/min) and diazepam(0.025㎎/㎏/min). The pressor response to raised ICP was not affected by iv 40㎍/㎏ ouabain but disappeared by icv 10㎍/㎏ ouabain and 6.25㎍/㎏ digoxin. These data suggest that ouabain causes pressor effect through direct interaction with a site(s) in central nervous system and bradycardiac effect by direct activation of vagal center, and ouabain blocks central sympathetic stimulation by increase of ICP in rabbits.