• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.491-498
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• 2004

In recent years, as an effort to grasp the leading position in the field of maritime trading, new ports and container terminals arc now under construction. Old ports are extended. At the beginning, stones were thrown down to form stone embankments, that is stone-dams, in the outer and inner boundaries of the planned reclamation-land. S.C.P(Sand Compaction Pile) works are often needed to improve the stability of stone-dams, where marine sediments arc relatively thick. Here, interests are centered on the shape of stone body. In this, drilling work won't provide a sufficient resolution. In addition, the result corresponds to only one borehole point information. Thus, the aim of this paper is to introduce an affordable technology, that is, a combined geophysical method(seismic tomography + Televiewer) enables to get the whole information about stone-dam section. The measuring and evaluating procedure is described in detail with an emphasis on dealing with the use of seismic detonator, proper borehole deployment and integrated data analysis. Examples of field experiments at Busan new port are illustrated, which will prove the benefit of combined geophysical method.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.922-929
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• 2004

In some port construction, a case of reclamation with dredged soil for land use can be found. Even though this is not a new technology, there are some problems on the test method and analysis. The design parameters are still remained to be solved to get accurate prediction. Sedimentation of particle and self-weight consolidation are the most important design parameters in reclamation by dredged soils. The design parameters are influenced by properties of the physical and sedimentation of dredged soils. This influencing factors can be determined depend on the history of long term sedimentation and particle characteristics. Thus, properties of the sedimentation and consolidation are varies depend on the regional geologic formation. In this paper, three different sites with different regional soil properties will be compared in design parameters of sedimentation and self-weight consolidation.

• 대한토목학회논문집
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• 제4권2호
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• pp.113-124
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• 1984

목포항(木浦港)의 1956~1982년(年) 기간(期間)의 검조기록(檢潮記錄)에 대(對)한 철저(徹底)한 분석(分析)이 최초(最初)로 수행(遂行)되었다. 년별(年別) 조화분석(調和分析)이 확장조화분석기법(擴張調和分析技法)에 의(依)해 수행(遂行)되어 영산강(榮山江) 방조제건설(防潮堤建設)이 천문조(天文潮)에 미치는 영향(影響)이 평가(評價)되었다. 방조제건설(防潮堤建設)에 따른 해면변화(海面變化)를 조사(調査)하기 위(爲)한 1965~1980년(年) 기간(期間) 및 1981~1982년(年)의 해면통계(海面統計)의 분석(分析)이 역시(亦是) 수행(遂行)되었다. 초기결과(初期結果)가 제시(提示)되었으며 추후(追後) 연구세목(硏究細目)이 토의(討議)되었다.

• Journal of Mechanical Science and Technology
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• 제15권12호
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• pp.1775-1783
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• 2001

For two decades, there has been an active research to enhance the performances of Particle Image Velocimetry (PIV) systems. However, the resulting systems are somewhat very costly, cumbersome and delicate. In this paper, we address the design and some first experimental results of a PIV system belonging to the opposite paradigm. The Miniature PIV or MPIV system feature relatively modest performances, but is considerably smaller (out MPIV could hold in dia. 40 mm$\times$120 mm), cheaper (out MPIV total cost is less than $500) and easy to handle. Potential applications include industrial velocity sensors. The proposed MPIV system uses a one-chip-only CMOS camera with digital output. Only two other chips are needed, one for a buffer memory and one for an interfacing logic that controls the system. Images are transferred to a personal computer (PC or laptop) via its standard parallel port. No extra hardware is required (in particular, no frame grabber board is needed). In our first MPIV prototype presented in this paper, the strobe lighting is generated by a cheap 5 mW laser pointer diode. Experimental results are presented and discussed.

• 한국항해학회지
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• 제25권1호
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• pp.33-44
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• 2001

유조선은 보통 상선과는 다른 선체구조와 작업환경을 가지고 있다. 유조선에서 사고가 발생하면, 보통 상선에서는 선박과 화물에 제한되지만 유조선 사고에 따른 피해는 선박과 화물에 추가하여 유류유출에 따른 엄청난 제3자에 대한 배상책임을 져야한다. 따라서 유조선 운항에 따른 위험요소, 사전/사후손실통제, 해상 보험과 관련된 법규정을 이해하고, 기대하지 않은 사고가 발생할 때 피해를 최소화해야 할 것이다. 이러한 피해를 줄이기 위해서는 사전에 유류오염방지 시스템구축 및 유류오염 피해보상에 대한 준비를 해야만 한다. 이러한 준비에도 불구하고, 유조선 사고는 빈번히 발생하고 있다. 이에 본 논문에서는 유조선 운항에 따른 근본적이면서 전반적인 위험관리 방안에 대해 연구하였다.

• 드라이브 ㆍ 컨트롤
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• 제12권2호
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• pp.39-48
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• 2015

In order to control the actuators of hydraulic machinery such as excavators, various control valves are typically assembled in a single block. Such a control block is called a main control valve(MCV). In this paper, we analyzed the working principle and the particular purpose of the design of all valves included in the MCV system. To Examine the reliability of the analysis model, the pressure drop of the MCV at each port was measured. The authors developed an analytical model of the control valve(main spool, load poppet, pressure relief, make up, and regeneration). The authors considered the notch shape of the spool while developing the analytical models of the main spool valve. Most importantly, at the stage before the analysis model was applied in the design tuning, the reliability was ensured by comparing the analysis results with the test results. This paper showed a process of developing an analysis model that can be utilized in the design and tuning stages.

• 물과 미래
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• 제21권1호
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• pp.87-94
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• 1988

금강하구의 비선형(비대칭) 조석을 관측결과로부터 조사하였는데 하구에서의 강한 해저마찰에 의한 에너지소산에도 불구하고 M4 분조는 확폭되어 강한 조석비대칭현상을 야기시킨다. 관측된 조석비대칭은 긴 지속시간의 낙조보다 상대적으로 짧은 지속시간의 강한 장조류속이 토사의 이동을 증대시키는 데 이 현상이 하구의 매몰을 유발시켜 M2 내역에 분포된 사주의 형성요인인 것으로 추정된다. M2 분조와 M4 분조에 관련된 첨두해안응력의 분포를 2차원조류 수치모델에 의해 산정했는데 결과는 현존의 조류퇴적체계중 소류사의 분포는 하구둑 건설로 인해 외항접근수로와 하구둑 사류부에 변화를 가져올 것으로 초기추정된다.

• 한국해안해양공학회지
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• 제1권1호
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• pp.31-43
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• 1989

사강하구의 비선형 조석 및 이에 관련된 퇴적동력학을 조석수치모형을 이용하여 조사하였다. 조석모형은 하구조문대의 노출양상 및 이차원 하구모형과 일차원 감조하천모형을 동적접합시키는 데 역점을 두었다. 모형의 결과는 하구의 강한 봉제소산에도 불구하고 M$_4$분조는 상당한 크기로 산정되었으며 이에 의한 조석비선형은 강한 장조와 상대적으로 약하나 대적시간이 긴 노조로서 제시된 바 하구사주형성의 한 요인이 된다. 또한 모형으로부터 산정된 해저최대봉제응력의 공간적인 분포는 사강하구둑 건설로 인해 군산항접 근수로 및 하구둑 하류부에 큰 퇴적변화가 야기될 수 있음을 제시하고 있다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 춘계 학술발표회
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• pp.692-701
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• 2009

The use of vertical drain method to improve the soft soil ground has been continuously increased in Korea such as Busan New Port, Saemangeum reclamation project and so on in Korea. Especially PBD(Plastic Board Drain), one of the vertical drain, has been widely used due to the economic feasibility, construction compatibility and quality control. However in case of using PBD, discharge capacity reduction caused by creep deformation of the PBD filter, bending, kinking and so on can be occurred. Therefore the purpose of this study is to solve these problems by developing Deformation-Compatible Vertical Drain, DCVD which allows to deform with consolidation settlement without bending and kinking of vertical drain. In order to investigate the performance of DCVD developed in this study, discharge capacity test, centrifuge model test and complex discharge capacity test for both PBD and DCVD are performed and the results are compared.

• 대한조선학회 특별논문집
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• 대한조선학회 2007년도 특별논문집
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• pp.14-21
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• 2007

A passenger ship is consist of five(5) constituents; passenger, sea, crew, port and ship itself and the rule & regulation which is applicable to passenger ship are differently required as their objects of constituents. the basic concept of rule & regulation can be defined all activities to keep safety of ship and her constituents. Especially, the rule & regulation for passenger ship design and construction shall be considered not only safety of ship itself but also safety of lives, so its are required more severe than commercial vessel. Recently, the IMO have finished the rule making work on the 'passenger ship safety' since it has been discussed last 2000 and next MSC meeting will be adopted the results. In this paper, the application method of rule & regulation are treated and the new rule which were made by IMO are introduced. The rule & regulation for passenger ship is one of the most important things. therefore, it is required to careful consideration to apply on the rule application.