• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2004.08a
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• pp.203-207
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• 2004

Yangtze River channel is in natural condition for a long time. There are more to be done in grade of navigation and transport. Since 1980's the rate of vessel in JiangSu channel is going up every year, especially for ocean vessels. Meanwhile, the serious factors such as no sailing at night have become a battlement causing the long period for vessels, high cost for shipowners, lower competitiveness for JiangSu ports along the Yangtze River. It also can not meet the port logistic development. After the Ships' Routeing in JiangSu has been carried out. It has improved the safety of navigation in JiangSu area and reduced the risk of pollution or other damage to the marine environment caused by ships colliding or anchoring in or near JiangSu channel. By analyzing, compareing, calculating and model forecasting. The main focus of the paper is put on the study the development of port, channel in JiangSu and efficiency in many fields. Navigation efficiency of the sailing at night; Safety efficiency of reducing the risk by ships; More efficiency of the higher cargo volumes of the other ports in Yangtze River with the increase cargo volume of JiangSu ports along Yangtze River. The purpose of this study is: To get the social and economical efficiency after the Ships' Routeing in JiangSu has been carried out. Also the role of the Ships' Routeing of JiangSu in the development of Port and Channel.

• Fire Science and Engineering
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• v.22 no.2
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• pp.38-43
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• 2008

Recently, the application of transverse ventilation system in accordance with oversized exhaust ports has been increased in bidirectional road tunnel in order to improving smoke exhaust ability. In this study, numerical simulations were carried out by using FDS (ver. 4.0) which includes variations of exhaust flow rates and heat release rate of fire to obtain the optimal smoke exhaust rate in case of fire in the transversely ventilation system. As a result, smoke exhaust amount tends to increase when the inner velocity is existing in the tunnel. In case of internal longitudinal air velocity 2.5m/s face to the fire, smoke moving distance should be restricted within 250m when the smoke exhaust rate which exceeds $244.8m^3/s$.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2007.11a
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• pp.233-236
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• 2007

In this paper, thermal sensitivity of the solid fuel grain in the hybrid rocket motor was investigated. When the heat from the non-reacting hot flow passing the grain ports is transferred to the solid fuel grain, the temperature fields in the solid fuel was numerically analyzed. These numerical analyzes were performed under the different nine port radii, and the critical distance between the ports in which the temperature in the solid fuel is sensibly responding was determined. Thus, the critical distance between the ports would be the important consideration for the design of the fuel grain because the high temperature in the fuel can bring the structural problems.

• Journal of Korea Port Economic Association
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• v.24 no.3
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• pp.125-146
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• 2008

Port marketing using websites in the e-business environment is essential in response to the competition to become hub ports, especially since shipping companies, ports' major customers, are being pressed by shippers to reduce logistics costs and introduce large ships to realize economies of scale, thereby reducing the number of ports of call. In this sense, this study intends to approach the port industry from the perspective of e-business and suggest vitalization methods using Gwangyang Port websites(6C; contents, community, communication, connection, commerce, customization) as one of the ways to turn it into Northeast Asia's hub port of logistics.

• International Commerce and Information Review
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• v.10 no.4
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• pp.301-319
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• 2008

The development of Korea in the Northeast through trade is not a matter of choice as far as national strategy is concerned, but is an important national policy that is a matter of life or death which will determine the future fate of Korea. This thesis will attempt to arrive at a general, tangible plan for the development of Korea in the Northeast centered around trade by examining the change in naval environment at home and abroad, the given economic situation in the Northeast, and the present state of essential port development in Korea-China-Japan. Its objective will be to provide strategies for the development of Busan port confrontation. For the last ten years, China has been growing at a rapid rate. Since a lot of the volume of naval trade is being transferred from Korea to China, we must do everything we can to improve the service and reduce cost. In addition, Japan also is losing international position. Japan's government and the private industry are trying to make Super Core Ports a prominent feature of their port system. If the Busan port system is to remain competitive, these aspects of the Japanese port system must be kept in mind to prevent trade from going to other ports with more competitive systems.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.3
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• pp.771-783
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• 1996

A desing technique of 8 ports variable wave impedance generator (8P-VWIG) is described. The design technique employs not only a numerical algorithm to find the structure with arbitrary characteristic impedance, but also a numerical solution to analyze the uniform elementrognentic fields established inside the generator. The 8P-VWIG so obtained is shown to have good performance with the VSWR of less than 1.4 at any frequency of interest below which higher order mode begin to propagate. The measured first resonant frequency is 152.1 MHz. The 8P-VWIG is designed based on the concept of an expanded multi-transmission line(8 channel). It is especially useful for the electronmagnetic interference(EMI) and electronmagnetic susceptibility(EMS) testing since it maximizes usable test crosssectional area, and its is easy change the polarization, vertical or horizontal, of field.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.13 no.3
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• pp.279-287
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• 2002

In this paper, a symmetric microwave lens to steer wide angle and to operate at broad band frequency range for a linear phased array transmitter was designed. To get accurate beam steering performance far a linear phased array transmitter, uniform amplitude transmission characteristics of microwave lens was focused. The measured result for the insertion loss deviation between Input and output ports of microstrip lens with 8 beam ports and 8 array ports was $\pm$3.1 ㏈ over 6~18 ㎓ band, which was very uniform characteristics. Using 8 elements linear array antenna, it was confirmed the radiation beam could be steered over $\pm$60$^{\circ}$ in azimuth. And the measured lens performance data and multi-beam steering pattern were presented.

• Journal of Korea Port Economic Association
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• v.30 no.2
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• pp.51-75
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• 2014

Cruise industry is a continually growing high value industry despite of economic recession. As Chinese cruise tourists increase, the cruise industry in Northeast Asia has been attracting attention. Korean ports have constructed cruise terminals with vision of becoming a cruise home port. Asian leading cruise country, Singapore has cruise industry strategy linked with Singaporean tourism strategy. Based on the Singaporean cruise industry, several strategies for Korean cruise industry development are suggested. Analyzing the economic effect of cruise home port and call-port and Korean cruise industry environment shows that Busan port is fit for home port, Incheon port is fit for sub home port, and Jeju port is fit for call-port. Korean cruise ports are playing a role in call-port in Northeast Asia cruise market, an introduction of Korean cruise company and home port by the company are needed to develop the Korean cruise industry.

• Journal of Navigation and Port Research
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• v.28 no.8
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• pp.709-714
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• 2004

This paper first tries to analyze total sea transport costs for the transshipment in Busan Port in comparison with direct transport to 4 Chinese Ports, Dalian, Tinajin, Qingdao and Shanghai, based on vessel operation scenarios. The results found that the transshipment in Busan port for the 4 Chinese ports are more expensive than the direct calling to the 4 ports, which implies that Busan port needs to make compensation as an incentive to the carriers providing transshipment service to it in order to keep their royalty. For the compensation, it suggested a method of calculating the Container Terminal Facilities Leasing Fee to levy additional revenue by port authority.

• Proceedings of the KIPE Conference
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• 2018.07a
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• pp.228-230
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• 2018

DC 마이크로 그리드를 위한 Three-Ports Half Bridge (THB) 제안하고 THB 컨버터의 효과적인 제어를 위한 동작 원리 및 수학적 모델링 그리고 각 포트 간의 전력을 독립적으로 제어하는 디커플링(Decoupling) 방법을 제안하고자 한다. DC 마이크로 그리드에서는 수용자의 부하 상황에 따라 계통뿐만 아니라 분산 전원 및 에너지 저장장치(ESS) 등에서도 전력을 공급받을 수 있다. 이로 인해 기존 전력제어 시스템의 경우 2-포트 컨버터 2개가 필요하고, 이는 부피뿐만 아니라 소자의 개수도 증가시키기 때문에 제작 및 설치 단가가 상승한다는 단점이 있다. 3-포트 컨버터의 경우, 하나의 변압기를 이용하고 전력스위치와 수동소자의 개수를 줄일 수 있으므로 기존의 전력변환장치 대비 전력 밀도를 높일 수 있다. 하지만 하나의 변압기를 이용하여 3개의 포트가 연결되어 있어 서로 간의 전력간섭이 일어나고. 과도기 때 의도 하지 않은 전력의 흐름이 발생할 수 있게 된다. 본 논문에서는 수학적 모델링과 분석을 통해 3-포트 컨버터의 동작원리를 알아보고, 각 포트 간 전력 제어의 상호 간섭을 제거할 수 있는 디커플링 방법을 제안하고자 한다. 또한, 모의시험과 1 kW급 시작품을 이용하여 제안한 디커플링 전력제어 방법의 타당성을 검증하였다.