• ETRI Journal
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• 제30권6호
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• pp.856-858
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• 2008

Odd networks were introduced in the context of graph theory. However, their potential as fault-tolerant multiprocessor networks has been shown. Broadcasting is one of the most important communication primitives used in multiprocessor networks. In this letter, we introduce efficient one-to-all broadcasting schemes of odd networks for one-port and all-port models. We show the broadcasting time of the former is 2d-2 and that of the latter is d-1. The total time steps taken by the proposed algorithms are optimal.

• ETRI Journal
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• 제31권3호
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• pp.330-332
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• 2009

Broadcasting is one of the most important communication primitives used in multiprocessor networks. In this letter, we demonstrate that the broadcasting algorithm proposed by Madabhushi and others is incorrect. We introduce efficient one-to-all broadcasting schemes of even networks for one-port and all-port models. The broadcasting time of the one-port model is 2d-3 and that of the all-port model is d-1. The total time steps taken by the proposed algorithms are optimal.

• 무역학회지
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• 제44권1호
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• pp.285-299
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• 2019

The 'One Belt One Road (OBOR)' initiative, which was promulgated as part of the enlargement policy along with the advent of Xi Jinping in 2013, is a policy to expand China's political and economic power externally through linkages with neighboring countries. China's overseas port investment plays an important role in the promotion of the 'OBOR' policy from the coast of China through maritime transportation routes from S.E Asia to Mediterranean and Europe. Since China's overseas port investment has been made from several factors such as political, economic, and military motives, it differs in purpose and character from investments made by private companies, such as Global Port Operators(GTO) which consider profitability first. This study aims to address future prospects and implications by analyzing the geopolitics of China's overseas port investment under the 'One Belt One Road' initiative. According to the results, China's overseas port investment is dominated by state-owned enterprises and political and security factors are more important than profitability. China's overseas port investment has been on a large scale in a short period of time, and China has faced with various problems both domestically and internationally. such as debt default, environmental problems, subordination problems from recipient countries and political and military confrontation with great countries such as United States, Japan and India etc.

• 한국항만경제학회지
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• 제24권2호
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• pp.113-129
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• 2008

항만과 항만관련 산업은 지역경제에 직접, 간접으로 영향을 미친다. 부산의 경우 지역 투입산출표(I-O)를 이용하여 추계하면 항만과 항만관련산업은 지역생산과 부가가치의 최소 1/5이상, 지역고용의 1/7이상의 영향력을 가지는 것으로 나타난다. 항만과 항만관련산업은 부산경제에서 가장 중요한 부문이며 세계의 다른 주요항만인 로테르담이나 싱가포르도 마찬가지이다. 항만이 지역경제에 미치는 영향은 과거 조사에는 실제 조사방법을 사용하였다. 지역투입산출표가 지역경제변수에 대한 보다 다양한 분석을 가능하게 하며 이 논문에서의 몇 개의 응용예가 보고되고 있다.

• 한국항만경제학회지
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• 제19권2호
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• pp.87-109
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• 2003

Localization is one of the typical phenomena of this age in Korea. Localization of Port is on the beginning in this Country as the introduction of Port Authority in the Port of Busan and Incheon. As the condition of world trade has been changed, the level of Competition among Ports is severer than before, especially in the East Asia Area. Since many experts of Port say that centralized control system of Port has many Problems, some other Port Control system has been studied and suggested for long time. One of the Countermeasures of these Port Problems is Port Authority System which aims the balance of central and local development. Port Authority System does not want to achieve only Public Duty or Utility but also Commerciality which is fundamentally very important for the survival of Port. In this Paper, the necessities of Port Authority Introduction in Korea was explained. And Port Authority System will be introduced 2004 year in Busan Port firstly and Incheon Port, secondly. The Main Contents of Port Authority System was suggested , in this Paper and some Problems which shall be considered for better operation of Port Authority System was investigated. I suggested some countermeasures, endeavoring the competitive advantage of Port and higher Port Performance, in terms of 3 Dimensions. One is in the side of basic Policy Directions, the other is the activation schemes of functional department which composed of many activities of Port Authority System and the third is in the side of operation body. As this paper, however, has some limitations and Port Authority System is just beginning stage, future research shall be continued in real and concrete level.

• 한국항해항만학회지
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• 제27권4호
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• pp.383-388
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• 2003

일반적으로 거의 모든 항만들은 출입구가 하나뿐인 폐쇄형태로 설계되어 있다. 선박이 대형화됨에 따라서 선박의 조종곤란성, 선회수역의 크기, 추가적인 예선사용료 등의 문제가 발생한다. 이러한 문제를 해결하기 위해서 폐쇄형태의 항만에서 선박의 출입구가 각각 존재하는 일방통항형 항만형태로의 발상을 전환할 필요가 있다. 따라서 이와 같은 일방통항형 항만의 장점을 선박운항자의 조종부하경감 관점에서 검토하기 위해서는 정량적이고 시스템적인 분석절차가 필요하다. 본 연구에서는 각각 다른 세가지 출항방식에 대한 조선자의 선호도를 퍼지적분 모델을 이용하여 평가하였다.

• 한국항만경제학회지
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• 제20권1호
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• pp.57-77
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• 2004

The meaning of seaport has always been translated into something concerned with nation-wide goals and viewpoints, which used to be in developing country. The time developing countries have tried to be in pursuit of their economic development, one of important sectors is SOC investment that is needed into huge capital input which they couldn't easily afford to it. Another one which we have to mention in terms of seaport at contemporary maritime matters is privatization of port, that is strongly connected with efficiency to achieve port productivity. All these factors can produce high quality of service, and port co-operation and diversification of their business areas, etc. Therefore we then have to think of private port management companies such as P&O Ports, Hutchison Whampoa in HK, etc. in order to provide better port service to the customers, and they can also get involved into capital port investment as well. This kind of concept already comes from Denholm Ship management companies in shipping. So, it is necessary for us to look into port management company in our side, which means, we have to be involved into such a business to invest and manage foreign ports as well as our ports. Then, port competitiveness will follow in our ports.

• 한국항만경제학회지
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• 제20권1호
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• pp.123-140
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• 2004

With the globalization of economy, there is keen competition among rountries to be a logistics hub and companies are striving to be first in establishing logistics system centering on advantageous sites, especially airport and seaports, to perform supply, production and distribution. Korea competing with Northeast Asia countries is also working out strategies in order to make Korea peninsula a logistics center of Northeast Asia taking advantage of its geographical strength. Gwangyang port has designated as Free Economic Zone together with Pusan and Jinhae, Incheon from October 24th, 2003. However, the introduction of Free Economic Zone in Korea lagged behind other major countries and it has a lot of operational problems. Approximately 600 areas worldwide are designated and operated as a Free Economic Zone and Gwangyang port and its surrounding area has several points to be settled as one of FEZ. First one is its limited functions and related laws. Next is imperfection on development, investment and management system of the hinterland. Lark of promotion activities could be one of the problems. This paper analyzes the above problems and presents various measures to activate Gwangyang Port and Gwangyang Free Economic Zone as follows Benchmarking to promote Gwangyang Free Economic Zone as follows Benchmarking other countries' system, governmental support, introduction & logistics functions, early development of the hinterland, supply of effective one-stop service, investment attraction into the area and diversified promotion & marketing activities.

• 한국항만경제학회지
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• 제33권3호
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• pp.1-16
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• 2017

중국은 1970년대 후반 개방개혁정책과 더불어 급속한 경제성장을 이루어왔다. 중국 경제성장은 초기에 동남부 연해지역을 중심으로 시작되어 2000년대부터는 상대적으로 경제가 낙후된 서부 및 동북부 지역으로 확산되었다. 특히 2013년 시진핑의 '일대일로' 이니셔티브는 중국의 대외진출 전략인 동시에 이들 지역발전을 위한 중요한 계기를 마련해주고 있다. 내륙항은 내륙지역의 물류중심지로서 해양항만과 연계 및 주변 내륙국가로의 접근성을 강화시키는 데 결정적인 역할을 한다. 따라서 중국의 동북부 및 서부지역의 해외시장 진출 및 자원확보를 위해 다수의 내륙항이 개발 및 운영되고 있다. 본 연구는 일대일로 이니셔티브에서 내륙항의 역할과 발전을 전망해 보는 데 목적이 있다. 결론적으로 일대일로 이니셔티브에서 내륙항의 역할은 더욱 증대될 것이며 이에 대응하여 내륙항의 발전 역시 일대일로 이니셔티브에서 중추적 역할을 하게 될 것이다. 따라서 우리나라 기업은 중국 내륙항의 개발 및 운영에 참여할 수 있는 방안의 수립을 적극적으로 고려해야 할 것이며, 이는 중국, 러시아, 중앙아시아, 동유럽 지역으로 시장을 확대해 나가는 데 좋은 기회를 제공할 것이다.

• 전기학회논문지
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• 제56권6호
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• pp.1105-1110
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• 2007

This paper describes an equivalent circuit modeling of 4-port connector system. A coupled transmission line was designed and fabricated, mimicking a 4-port connector system, and then S-parameters were measured using 4 port VNA (Vector Network Analyzer). The S-parameters from measurement and from Full-wave simulator coincided quite nice. By using these S parameters, an equivalent circuit parameters for a 4-port system was obtained. The time domain response from the equivalent circuit model matched to the signals, which was measured using TDR(Time Domain Reflectometry) meter. We were also convinced that there should be enough bandwidth to get a meaningful time domain result from Fourier inverse transformation of the S parameters. In addition, we applied the conversion algorithm to the 4-port connector system, which calculates the S-parameters of a 4 port system using the data from a 2-port VNA with the other ports open. Comparison of the two data, one from measurement and the other one from the conversion algorithm, was made in this manuscript.