• Journal of Ship and Ocean Technology
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• 제8권4호
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• pp.26-33
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• 2004

PFFEM software, PFADS has been developed for the vibration predictions and analysis of coupled system structures in medium-to-high frequency ranges. PFFEM is numerical method which solves energy governing equation using finite element technique for complicated structures where the exact solutions are not available. Through the upgrades, present PFADS R3 could cover the general beam and plate structures including various kinds of beam-plate rigid joints and other joint systems such as spring-damper junction and rigid bar connection. This software is composed of 3 parts; translator, model converter and solver. The translator makes its own FE-model from bulk data of commercial FE software, and the model converter is used to convert FE-model to PFFE-model automatically. The solver calculates vibrational energy density and intensity for PFFE-model by solving global matrix equations of PFFEM. For the applications of real transportation systems, a container ship model has been examined with respect to major parameters, and reliable results have been obtained.

• 수산해양교육연구
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• 제29권2호
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• pp.354-364
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• 2017

This study tries to evaluate the effect of ITT introduction in Busan New Port. The study used the estimation model of the number of vehicles required in accordance with the backhaul rate. The model used big data, COPINO e-document for one year in 2015. COPINO recorded the event such as truck ID, container ID, ATA, damage etc when truck arrived at gate. The study finds important information to estimate the required number of trucks for handling current ITT containers in Busan New Port: Daily throughput in Busan New Port is 1650 vans, especially night throughput recorded peak level in 1800 hours to 2400 hours, the throughput between adjacent terminals recorded high, i.e PNIT to HPNT. The transportation capability for 6 hours between terminals is from 4 vans to 7 vans. The required trucks are estimated 89 currently without considering peak level. If we change the back haul rate from current 20% to 40%, 60% and 80%, how much would the cost drop? It was discovered that, if it is raised to 40%, 60% and 80%, the number of vehicle required will be reduced from 89 (current) to 76, 65 and 59. It was also discovered that the total savings will reduce down to 12%, 25% and 34%.

• 한국항해항만학회지
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• 제30권5호
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• pp.397-404
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• 2006

감천항은 수산물, 연안화물 등 산화물 전용부두 처리기능이 복합된 다목적항만으로 개발되었다. 1997년 컨테이너 부두가 개장된 이후로 현지 최대 $40,000\sim50,000DWT$급 컨테이너 선박이 입 출항 하고 있다. 그러나 감천항은 방파제 입구가 협소하고, 방파제 전방에서 선박의 통항상충이 상존함으로 해상충돌사고의 위험이 높아 이에 대한 교통특성 파악이 요구되고 있다. 따라서 현재 감천항을 입 출항하는 선박과 감천항 전방해역의 선박에 대한 항적과 시간대별 교통량을 통해 첨두시간대 등의 해상교통특성을 분석하였다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 춘계학술대회 및 창립 30주년 심포지엄(논문집)
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• pp.137-146
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• 2006

감천항은 수산물, 연안화물 등 산화물 전용부두 처리기능이 복합된 다목적항만으로 개발되었다. 1997년 컨테이너 부두가 개장된 이후로 현재 최대 $40,000{\sim}50,000$ DWT급 컨테이너 선박이 입 출항하고 있다. 그러나 감천항은 방파제 입구가 협소하며, 방파제 전방에서 선박의 통항상층이 상존함으로 해상충돌사고의 위험이 높아 이에 대한 교통특성 파악이 요구되고 있다. 따라서 현재 감천항을 입 출항하는 선박과 감천항 전방해역의 선박에 대한 항적과 시간대별 교통량을 통해 첨두시간대 등의 해상교통특성을 분석하였다.

• 한국소음진동공학회논문집
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• 제20권7호
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• pp.629-636
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• 2010

A Mobile Harbor is a new transportation platform which can load and unload has containers to and from very large container ships on the sea. Currently designed Mobile Harbor a catamaran type which is equipped with precisely controlled gantry crane on the deck, and can transport 250 TEUs at a time. Loading and unloading works by crane require very small motion of Mobile Harbor in waves, because it may be operated outside of harbors. In this project, applicability of both tuned-type anti-rolling tank and maglev-type active mass driver is studied as anti-rolling systems.

• 방사성폐기물학회지
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• 제20권4호
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• pp.511-521
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• 2022

Decommissioning of nuclear power plants generates a large amount of radioactive waste in a short period. Moreover, Radioactive waste has various forms including a large volumes of metal, concrete, and solid waste. The disposal of decommissioning waste using 200 L drums is inefficient in terms of economics, work efficiency, and radiation safety. Therefore, The Korea Radioactive Waste Agency is developing large containers for the packaging, transportation, and disposal of decommissioning waste. Assessing disposability considering the characteristics of the radioactive waste and facility, convenience of operation, and safety of workers is necessary. In this study, the exposure dose rate of workers during the disposal of new containers was evaluated using Monte Carlo N-Particle Transport code. Six normal and four abnormal scenarios were derived for the assessment of the dose rate in a near surface disposal facility operation. The results showed that the calculated dose rates in all normal scenarios were lower than the direct exposure dose limitation of workers in the safety analysis report. In abnormal scenarios, the work hours with dose rates below 20 mSv·y^-1 were calculated. The results of this study will be useful in establishing the optimal radiation work conditions.

• Steel and Composite Structures
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• 제48권4호
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• pp.475-483
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• 2023

In this paper, a new energy-efficient semi-active hybrid bulk damper is developed that is cost-effective for use in structural applications. In this work, the possibility of active and semi-active component configurations combined with suitable control algorithms, especially vibration control methods, is explored. The equations of motion for a container bridge equipped with an MDOF Mass Tuned Damper (M-TMD) system are established, and the combination of excitation, adhesion, and control effects are performed by a proprietary package and commercial custom submodel software. Systematic methods for the synthesis of structural components and active systems have been used in many applications because of the main interest in designing efficient devices and high-performance structural systems. A rational strategy can be established by properly controlling the master injection frequency parameter. Simulation results show that the multiscale model approach is achieved and meets accuracy with high computational efficiency. The M-TMD system can significantly improve the overall response of constrained structures by modestly reducing the critical stress amplitude of the frame. This design can be believed to build affordable, safe, environmentally friendly, resilient, sustainable infrastructure and transportation.

• 농업과학연구
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• 제30권2호
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• pp.175-183
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• 2003

본 연구에서는 청과물 포장설계시 중요한 자료가 되는 청과물의 공진 주파수 및 정점가속도 등의 진동특성을 분석하기 위하여 실험적 방법을 적용하였으며, 그 결과를 요약하면 다음과 같다. 1. 청과물의 진동특성을 분석할 수 있는 실험장치를 구성하였으며, 장치의 제어와 계측을 위한 컴퓨터 프로그램을 개발하였다. 2. 공시된 배의 공진 주파수는 약 64.5~72.2Hz 범위이었으며, 정점가속도는 약 1.78~2.21G-rms 범위이었다. 3. 공시된 배의 공진 주파수 및 정점 가속도는 배의 질량과 체적이 증가함에 따라 감소하는 것으로 판단되었다. 4. 배의 공진 주파수 및 정점 가속도와 기계적 특성들간에는 생물체항복변형량(BD) 및 극한변형량(RD)을 제외하고는 상관관계가 매우 낮은 것으로 분석되었다. 5. 본 실험의 목적은 과실의 공진 주파수를 구명하는 것으로 이 결과는 배의 운송 시 차량의 입력주파수와 배의 공진 주파수가 일치되어 공진으로 급격하게 가속도가 증가되는 것을 방지함으로써 충격에 의한 손상을 줄이는데 활용될 수 있을 것이다.

• 한국경제지리학회지
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• 제1권1호
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• pp.57-74
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• 1998

국제물류를 국제무역의 물적유통과 국제 화물유동으로 정의하고 방법론상의 변화를 고찰한 결과 다음과 같은 과제를 제시할 수 있다. 첫째, 국제물류에 관한 연구방법의 개발로 물류를 단지 수송의 현상으로써 인식하는 것이 아니라 생산과 소비를 결합하고 정보류를 포함한 종합적 로지스틱으로써 이해할 필요성이 있다. 둘째, 국제물류 유동의 모델화에 관한 연구는 장차 도시를 포함한 지역간의 관계를 주목하는 미시적 관점에서의 연구가 필요하다. 그리고 글로벌 경제로 국가뿐만 아니라 다국적 기업도 무역의 주체로 등장하기 때문에 문화적.행동론적 요소를 가미한 입지론과 경제지리학은 새로 구축되어야 할 것이다. 셋째, 국제물류를 배경으로 한 항만과 그 후배지와의 관계에 대한 연구는 기업의 의사결정 행동으로서 항만의 이용을 야기시키는 요인까지 분석할 필요가 있다. 넷째, 석유파동 이후 輕薄短小 화물, 유연적 전문화로 인한 다품종 소량 생산체제와 자유무역주의의 등장과, 신선도를 요하는 식료품이나 화훼 등의 고속수송의 필요성으로 항공 화물수송이 중요시되고 있기 때문에 국제공항을 중심으로 화물의 후배지와 지향지에 대한 연구의 필요성이 제기된다.

• 한국항만학회지
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• 제6권1호
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• pp.93-110
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• 1992

The most change in this century is supposed to be declination of ideology, and block of world economy. Addition to down full of cold war atmosphere around Northeast Asia, not only economic and social mood in this region is dramatically changed, but also it gave birth to the block of Northeast economy that accerlated new hub of world economy. According to dramatic change of economic surroundings the dynamic potential of growth in this region will be guided to enlarge inter-regional trade and increase volume of trade, thus suggests to grow steadily transportation. cargos in this region will have to arrange the system of delivery and inner transportation, accessary facilities, inter-regional harbors if North America and EC has connected easily. As have accerlated GATT and UR represented multilateralism and regionalism, it has regulated to increase trades of region due to relief of the trade barrier through specific areas has agreed with separately. The flow of regionalism of world economy has appeared to realize EC and NAFTA centered U.S.A, and also has presented to free trade region or one-size market agreement in Asia as APEC, EAEG in Malaysia, and etc. In defense to this block and internationalism of world economy, Pusan has to come forward to the hub of Northeast others has proposed a project to dominate the Northeast, Economy Association Agreement as Far East comprehensive development project in USSR, Hunchun development project in NK, and East Sea development project in PRC, Niigate regional development in Japan, Duman River development project in NK, and East Sea development project in Korea. As this exercise has proceed, Pusan also have arranged development strategy definitely and prepared provisions systematically. Engaging to participate center of delivery system is meant to be completed complex functions, namely the transfer storage processing & assembly function of international commodity. Pusan has ability to be terminal point of TSR. it had been connected to EC as the biggest economy block and TKR as complex transportation root to Far East, it would be the center of inground and seabase delivery terminal to Rotterdom as the biggest container pier and major piers to North-East and South East Asia. In order to provide a Role of 21 century's internationalization, Pusan has appealed to participate in management information research and development connected to Pohang-Ulsan-Changwon-Masan, and has utilized efficiently the resources such as man, material, money and information.