다물체 연성효과를 고려한 부유체의 동적거동 안전성 해석

김영복,김무현,김용욱,Kim, Young-Bok,Kim, Moo-Hyun,Kim, Yong-Yook 대한조선학회 2009 大韓造船學會 論文集 Vol.46 No.6

Recently, there are several problems in space, contiguity and facility of the existing harbors issued due to the trend of enlarging the container capacity of the large container vessel, the Mobile Harbor has been proposed conceptually as an effective solution for those problems. This concept is a kind of transfer loader of the containers from the large container ship, which is a floating barge with a catamaran type in the underwater part, and so prompt maneuverability and work effectiveness. For the safe mooring of two floating bodies, a container and the mobile harbor, in the near sea apart from the quay, a robot arm mooring facility specially devised would be designed and verified through comparison study under various environmental sea condition in the inner and outer harbor. DP system (Dynamic Positioning System) using the azimuth thruster and a pneumatic fender, etc, will be considered as a next research topic for the mooring security of multi-body floaters.

선박안정성 향상을 위한 횡동요 방지 장치 개발에 관한 연구

김영복,이권순,김준효,채규훈,Kim, Young-Bok,Lee, Kwon-Soon,Kim, Jun-Hyo,Chae, Gyu-Hoon 해양환경안전학회 2005 해양환경안전학회지 Vol.11 No.1

선박 횡동요는 물적 손실을 초래할 뿐만 아니라, 승선자의 거주성, 안전성 및 작업능률을 저하시키는 가장 큰 요인이 된다. 횡동요억제를 위한 많은 연구는 다양한 형태의 장치개발이라는 결과를 가져왔으며 상당한 효과를 얻고 있다. 지금까지 개발 된 대부분의 장치는 그 성능을 고려하지 야더라도 특수한 목적의 선박을 대상으로 설치$\cdot$운영되고 있으며, 고가이고 복잡하여 설치 상에도 많은 문제점을 안고 있다. 따라서 본 논문에서는 선박의 선미측에 설치한 플랩을 이용하여 운항중인 선박의 횡동요 억제에 관해 고찰하고 있다. 본 장치는 중$\cdot$소형의 선박에도 쉽게 설치하여 운용이 용이할 뿐만 아니라, 적절한 제어시스템 구축으로 피칭운동도 제어할 수 있는 장점이 있다. 본 논문에서는 이러한 장치를 설치한 선박에 대해 실험적 기법을 이용하여 모델링을 행하고 시뮬레이션을 통해 장치의 횡동요 억제효과를 검증하고 있다. We have investigated the usefulness cf active stabilizing system to reduce ship rolling under disturbances, using varying reaction cf the flaps. In the proposed anti-rolling system for a ship, the flaps as the actuator are installed on the stem to reject rolling motion induced by disturbances like wave. The action induced by flaps which depends on power of disturbances am take the ship balance. Especially, in this study we identify the controlled system under the undefined system structure using spectral analysis and experimental studies. Based on these informations, we design the controller to evaluate the usefulness of the proposed system.

용담댐 방류에 따른 하상변동 예측

김영복,정승권,심순보,Kim. Young-Bok,Jung. Seung-Kwon,Shim. Soon-Bo 한국방재학회 2006 한국방재학회논문집 Vol.6 No.1

본 연구에서는 댐하류부에서 댐의 방류량에 따른 하상변동을 예측하기 위하여 SMS 모형을 사용하여 2차원 분석을 실시하였다. 용담다목적댐 하류유역인 금강 상류지역에 RMA-2 및 SED-2 모형을 이용하여 수리분석 및 유사이동을 통한 하상변동 모의를 실시한 결과 만곡수로에 대한 횡단면 침식 및 퇴적의 정량적 경향, 교각부근에서 세굴경향의 시각적 분석이 가능하였다. 만곡부인 No.176(1.4 km)지점에서는 <TEX>$-102.4 mm{\sim}54.2 mm$</TEX>, No. 146(7.4 km)지점에서는 <TEX>$-104.1 mm{\sim}28.9 mm$</TEX> 정도의 한 횡단면 내에서 침식과 퇴적의 차이가 발생하였고, 직선수로의 감동교(No.164+100)에서는 비교적 균일한 침식이 발생했으나, 만곡수로에 위치한 덤덜교(No.146+50)에서는 만곡의 영향으로 우측의 침식이 활발한 것을 모의 할 수 있었다. 홍수시 댐방류량에 대한 하류부의 대책 수립에 있어서 만곡수로, 교량, 지류합류지점과 같은 1차원 분석으로는 미흡한 취약지구에 대해 2차원적인 분석을 실시하는 것이 타당하다고 판단된다. The purpose of this study is to identify the downstream influences due to the dam discharge by using 2-dimensional model, SMS(Surface water Modeling System). RMA-2 and SED-2D in SMS were applied to Yongdam multipurpose dam watershed located in Gum river basin. Through the simulation, erosion and deposit quantitative analysis of sinuous channels and scour pattern analysis of bridges have been done. A differences erosion depths between deposit are simulated as <TEX>$-102.4 mm{\sim}54.2 mm$</TEX> at No.176(1.4 km) and <TEX>$-104.1 mm{\sim}28.9 mm$</TEX> at No.146(7.4 km), sinuous channel. The river bed at Kamdong bridge in straight channal is simulated as uniform erosion. However, the river bed at Dumdul bridge in sinuous channal has been shown as different erosion depths at each sides. Consequently, the parts that could not be simulated on the existing 1-dimensional model, can be improved results by using a 2-dimensional model, about weakness points for hydraulic modeling such as extreme bend, tributary confluence.

5083-H321 알루미늄 합금의 해수 내 전류밀도의 변화에 따른 전식 특성 연구

김영복,김성종,Kim, Young-Bok,Kim, Seong-Jong 한국표면공학회 2019 한국표면공학회지 Vol.52 No.1

Electrolytic corrosion of the ship's hull can be occurred due to stray current during welding work using shore power and electrical leakage using shore power supply. The electrolytic corrosion characteristics were investigated for Al5083-H321 through potentiodynamic polarization and galvanostatic corrosion test in natural seawater. Experiments of electrolytic corrosion were tested at various current densities ranging from $0.01mA/cm^2$ to $10mA/cm^2$ for 30 minutes, and at various applied time ranging from 60 to 240 minutes. Evaluation of electrolytic corrosion was carried out by Tafel extrapolation, weight loss, surface analysis after the experiment. In the electrolytic corrosion characteristics of Al5083-H321 as the current density increased, the surface damage tended to proportionally increase. In the current density of $0.01mA/cm^2$ for a applied long time, the damage tended to grow on the surface. In the case of $10mA/cm^2$ current density for a applied long time, the damage progressed to the depth direction of the surface, and the amount of weight loss per hour increased to 4 mg/hr.

동의보감(東醫寶鑑)에 수록된 원지(遠志)가 주약(主藥)으로 배오(配伍)된 처방(處方)의 방제학적(方劑學的) 고찰(考察)

김영복,윤용갑,Kim Young-Bok,Yun Young-Gab 대한한의학방제학회 2002 大韓韓醫學方劑學會誌 Vol.10 No.1

There are total 33 prescriptions containing Polygala tenuifolia as a principal medicine in Donguibogam. This report describes the studies on therapeutic range, symptom, pathology and composition of 33 Polygala tenuifolia-main blended Prescriptions from Donguibogam. The percentage of Polygala tenuifolia-main blended prescriptions for the therapeutic range are as follows: psychopathy is the most frequent(54.4%) and eczema, purulent inflammation is second(21%) and feebleness is third(15%). The main pathologies of Polygala tenuifolia-main blended prescriptions are associated with heart, kidney and stomach. The main combinations of Polygala tenuifolia-main blended prescriptions in psychopathy are Jeongji-hwan and Chongmyung-tang.

성인 여성의 자궁경부암 선별검사 수검에 관한 예측인자

김영복,김명,정치경,이원철,Kim, Young-Bok,Kim, Myung,Chung, Chee-Kyung,Lee, Won-Chul 대한예방의학회 2001 예방의학회지 Vol.34 No.3

Objectives : To examine the screening rate of cervical cancer in women and to find out the predictive factors for participation in cervical cancer screening programs within their life-time and within the last two years. Methods : The data was based on self-reported questionnaires from 1,613 women whose ages ranged from 26 to 60 years; this survey was peformed between December 1999 and January 2000. This study analyzed the predictive factors for participation in cervical cancer screening programs within their life-time and within the last two years. A logistic regression analysis was performed in order to derive the significant variables from the predisposing factors(demographic factor, health promotion behavior, reproductive factor), intervention factors(information channel, relation with medical stan, and proximal factors(attitude, social influence, self-efficacy). All analyses were peformed by the PC-SAS 6.12. Results : Our analyses showed that the screening rate for the women who received a cervical cancer screening(Pap smear) more than once within their life-time was 56.1% while those who had received one within the last two years was 34.5%. The significant factors for participation in cervical cancer screening program within their life-time were their income, married age, health promotion score, relation with medical staffs, social influence, and self-efficacy. On the other hand, age, number of pregnancies, menarche age, relation with medical staffs, social influences, and self-efficacy were significant factors for those being screened within the last two years. The predictive power of the logit model within their life-time was 68.8% and that within the last two years was 66.6%. Conclusion : The predictive factors for participation in cervical cancer screening program within their life-time are different from those for within the last two years. and that women's relations with medical staffs and social influences were the critical factors impacting on cervical cancer screening rates.

공장폐열 회수장치에 관한 연구 - U자형 다관식 열교환기의 성능에 관하여 -

김영복,송현갑 ( Young Bok Kim,Hyun Kap Song ) 한국농업기계학회 1983 바이오시스템공학 Vol.8 No.2

구성주의 수업의 가치와 한계

김영복(Kim Young bok) 공주대학교 교육연구소 2008 교육연구 Vol.22 No.-

21세기 사회의 추세에 따라 최근 창의력 증진의 가치를 갖고 있는 구성주의 교육관이 부각되고 있다. 어떤 하나의 관점을 오류 없이 적용하기 위해서는 그 관점의 가치와 한계를 깊이 분석하여 적용범위를 탐색해야 한다. 이러한 필요성에 따라 구성주의 수업의 가치와 한계를 분석하여 보았다. 구성주의 수업은 다음과 같은 가치를 지닌다. ① 학생들의 창의력을 증진시키는 환경을 제공한다. ② 학생들이 실생활과 관련된 유용한 지식을 구성한다. ③ 협력학습을 조장한다. ④ 학습자의 능동적인 학습이 이루어진다. 반면 구성주의 수업에서는 ① 지식의 유용성을 강조함으로써 참되지 않을 지식을 다룰 가능성이 있다는 점 ② 유용성의 기준이 개인에 따라, 실생활의 맥락에 따라 유용성이 달라짐으로 명료하게 정의할 수 없다는 점 ③ 적용되어질 교과내용 영역이 병렬적, 전체적으로 제시될 수 있는 교육내용에 국한된다는 점 ④ 적용되어질 대상이 학생 특성에 따라 제한될 수 있다는 점 ⑤ 고등 정신능력 증진에 대한 객관주의 수업의 가치를 간과하고 있다는 점 ⑥ 우리의 현행 교육과정 일정상 소수의 주제를 다룰 수밖에 없어 전면적으로 실시할 경우 기본 교과이수가 매우 어렵다는 점 등 몇 가지 중요한 문제점이 노정된다. 이상에서 언급한 가치와 한계를 고려해볼 때 구성주의 수업은 전통적인 또는 객관주의 수업을 대체할 것이 아니라 보완하는 방향에서 적용되어져야 할 것이다. The constructivist educational perspective that has a merit of developing creativity is raised recently in the trend of 21C society. In order to provide basic data for effective employment, the merits and limits of constructivist instruction were analyzed in this study. The constructivist instruction has merits as follows - ① The instruction provide environment to facilitate students’ creativity. ② The instruction is interested in the construction of useful real-life knowledge. ③ The instruction promote cooperative learning. ④ Students’ active learning is evolved in the constructivist instruction. But the constructivist instruction has limits as follows - ① The instruction emphasize utility of knowledge. As a result, the instruction has some degree of possibility that false-knowledge can be processed. ② The criterion of utility can not be defined clearly, because it is defined differently according to the individuals and the contexts of real life. ③ The instruction is only applied in educational content area that is presented with the parallel and whole structure. ④ The instruction is applied limitedly according to students’ traits. ⑤ The constructivism in education under-estimate the merit of the inquiring activities of objective knowledge that can facilitate high levels of thinking abilities. ⑥ Because of treating fewer topics in the instruction, it is difficult for pupils to complete a required course in school. Considered merits and limits mentioned above, the constructivist instruction has to be applied in the direction not to substitute but supplement the traditional instruction.

수직이중관형 잠열축열장치의 성능분석

김영복(Young-Bok Kim),송현갑(Hyun-Kap Song) 한국태양에너지학회 1990 한국태양에너지학회 논문집 Vol.10 No.1

고밀도 잠열축열장치의 최적설계와 효율적인 작동을 위해서는 그 전열특성과 축열효율이 규명되어야 한다. 본 연구에서는 수직이중관형 잠열축열장치의 방열과정에서의 전열특성을 이론 및 실험적으로 분석하였으며 두 결과는 잘 일치하였다. 그리고 컴퓨터 시뮬레이션을 통하여 방열효율에 대한 설계 및 작동피라미터의 영향을 분석하였다. For the optimal design and the efficient operation of the double pipe type latent heat storage equipment, the effect of the parameters of the system were analysed. The statistical analysis showed that the theoretical and the experimental results of the volume change rate and the temperature variations were well agreed. Therfore, this theoretical model is reasonable to analyze two dimensional moving boundary problems.<br/> In the analysis of the effects of the parameters, the heat extraction fraction and the water outlet temperature of the system as function of the time were analysed depending on the initial temperature of PCM, water inlet temperature, water mass flow rate and the dimension of the inner tube.

모바일하버의 기상환경에 따른 작업효율 예측기법

김영복(Young-Bok Kim),박준수(Jun-Soo Park),김용욱(Yong-Yook Kim) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11

In this study, the calculation scheme of workability by the evaluation of the motion response based on the wave scattered diagram on site was investigated for the prediction of the ability of on-board crane work on the mobile harbor deck. The Hanuri ship and Gunwoo barge were substituted for a container ship and the mobile harbor, respectively, for the numerical calculation and the site experiment. At first, the 6-DOF motion RAOs are calculated, and then the 6-DOF motion responses are obtained from the manipulation of the wave spectra based on the wave scattered diagram on site(Busan coastal area) and the 6-DOF motion RAOs, and the current and the wind effects are also reflected to a certain degree. Next, the workabilities are estimated based on the wave occurrence probability in the wave scattered diagram on site. The results could be used as the order instruction of on-board crane work of the mobile harbor according to the day weather forecasting report. The study result was verified by the on-site experiment in Busan coastal area.