한·러 과학기술 협력

송재욱 배재대학교 한국-시베리아센터 2000 한국시베리아연구 Vol.4 No.-

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.

유전적 최적화 기법을 이용한 축류 펌프의 설계

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.

전기적 모사에 의한 155Mbps 광 송 · 신 모듈의 설계

송재욱,권오경,김영호,박기성,김홍만 대한전자공학회 1995 대한전자공학회 학술대회 Vol.1995 No.1

모시는 글

송재욱 한국항해항만학회 2024 한국항해항만학회 학술대회논문집 Vol.2024 No.11

러시아 연방 산업재산권 제도

송재욱 배재대학교 한국-시베리아센터 2002 한국시베리아연구 Vol.5 No.-

압입시험을 통하여 초탄성 재료 물성치를 평가하는 단순한 방법

송재욱,김민석,정구훈,김현규 한국전산구조공학회 2019 한국전산구조공학회논문집 Vol.32 No.5

In this study, a new simple method for the estimation of hyperelastic material properties by indentation tests is proposed. Among hyperelastic material models, the Yeoh model with three material properties (C10, C20,C30) is adopted to describe the strain energy density in terms of strain invariants. Finite element simulations of the spherical indentation of hyperelastic materials of the Yeoh model with different material properties are performed to establish a database of indentation force-displacement curves. The indentation force-displacement curves are fitted by cubic polynomials, which are approximated as a product of third-order polynomials of (C10, C20,C30). A regression analysis is conducted to determine the coefficients of the equations for the indentation force-displacement curve approximations. A regression equation is used to estimate the hyperelastic material properties. The present method is verified by comparing the estimated material properties with true values. 본 논문에서는 압입시험을 통해서 초탄성 재료 물성치를 평가하는 간단한 방법을 제시하였다. 초탄성 재료 모델 중, 3개의 물성치(C10, C20,C30)를 가지는 Yeoh 모델을 선택하여 주연신률로 표현되는 변형률 에너지 밀도를 적용하였다. Yeoh 물성치를 변화시키며, 구형 압입시험 유한요소해석을 수행하여 압입자 반력-변위 곡선을 획득하였다. 압입자 반력-변위 곡선을 3차 다항식으로 근사하였고, 이 다항식을 물성치(C10, C20,C30)의 3차 곱으로 근사된 3차 다항식으로 표현하였다. 압입자 반력-변위 곡선 근사를 위해 회귀분석을 진행하여 수식들의 계수를 결정하였으며, 이 회귀식을 이용하여 초탄성 재료의 물성치를 평가하였다. 초탄성 재료 물성치 평가를 수행하고 오차를 비교하여 유효성을 보여 주었다.

Radar Signal Detecting & Processing 장치의 개발에 관한 연구

송재욱 한국항해항만학회 2000 한국항해항만학회지 Vol.24 No.5

This paper deals with the development of RACOM(Radar Signal Detecting & Processing Computer). RACOM is a radar display system specially designed for radar scan conversion, signal processing and PCI radar image display. RACOM contains two components; i )RSP(Radar Signal Processor) board which is a PCI based board for receiving video, trigger, heading & bearing signals from radar scanner & tranceiver units and processing these signals to generate high resolution radar image, and ⅱ)Applications which perform ordinary radar display functions such as EBL, VRM and so on. Since RACOM is designed to meet a wide variety of specifications(type of output signal from tranceiver unit), to record radar images and to distribute those images in real time to everywhere in a networked environment, it can be applicable to AIS(Automatic Identification System) and VDR(Voyage Data Recorder).

Deformable Model을 이용한 원형자동추출방법에 관한 연구

송재욱 한국항해항만학회 1998 한국항해항만학회지 Vol.22 No.4

This paper presents a procedure for automated extraction of ridge shadows in noisy gray images. This procedure mainly consists of 1) a deformable model which is designed basing upon the knowledge about the shape of shadows and is expected to be useful in extracting ridge shadows especially located in low signal to noise ratio background, and 2) the scale space scheme which is also useful even if there is less information about the size and the positions of ridge shadows in advance. This procedure is applied to artificial images and its performance is evaluated experimentally.

Peptide Nucleic Acid Clamping and Direct Sequencing in the Detection of Oncogenic Alterations in Lung Cancer: Systematic Review and Meta-Analysis

송재욱,이종후 연세대학교의과대학 2018 Yonsei medical journal Vol.59 No.2

Purpose: Molecular testing in non-small cell lung cancer (NSCLC) aids in identifying oncogenic alterations. The aim of this study was to compare the rates of detection of oncogenic alterations and responsiveness to epidermal growth factor receptor-tyrosine kinase inhibitors (EGFR-TKIs) according to EGFR mutation status as determined by peptide nucleic acid (PNA) clamping or directsequencing (DS). Materials and Methods: We performed a systematic literature search using MEDLINE, EMBASE, and the Cochrane Central Register. Data from included studies were pooled to yield summary sensitivity, specificity, positive and negative likelihood ratios, diagnosticodds ratio, and receiver operating characteristic curves. A meta-regression analysis was conducted to identify potential sources of heterogeneity between selected studies. Results: We identified 10 studies comprising 924 patients. Oncogenic alterations were detected in 340 of 924 cases (36.8%) with PNA clamping and in 250 of 924 (27.1%) with DS. The pooled sensitivities of PNA clamping and DS were 0.93 [95% confidence interval(CI): 0.90−0.95] and 0.69 (95% CI: 0.64−0.73), respectively. According to meta-regression analysis, none of the covariates were found to be significant sources of heterogeneity. With respect to treatment responses to EGFR-TKIs, there was no significant difference therein between EGFR mutations detected by PNA clamping and DS (53.4% vs. 50.8%; risk ratio, 0.99; 95% CI 0.83−1.19; p=0.874). Conclusion: We demonstrated that PNA clamping has a higher sensitivity than DS for detecting oncogenic alterations in NSCLC. Our findings suggest that PNA clamping is a more useful method for clinical practice.