• 한국항만학회지
• /
• 제14권2호
• /
• pp.143-154
• /
• 2000

In port management, the scale of facilities and port layouts are major factors characterizing the port, which influence port economics and productivities continuously through the port operation. Grouping ports in certain region by their characteristics could be used as the principal informations to establish national policy for port development or investment and also to analyze the competitiveness between ports. Currently Korean ports are divided into two groups such as the local port and the designated port containing foreign trade port and coastal port under the Korean port law. These divisions seem to be used for port administration as the matter of convenience but some qualitative grouping is needed for research of port problems. In this paper, 20 major Korean ports were clustered by the similar characteristics using Fuzzy C-Means and found to be classified 8 qualitative groups.

• 한국항해학회지
• /
• 제24권4호
• /
• pp.247-254
• /
• 2000

Grouping ports in certain region by their characteristics could be used as the principal informations to establish national policy for port development or investment and also to analyze the competitiveness among ports. Currently Korean ports are divided into two groups such as the local port and the designated Port containing foreign trade port and coastal port under the Korean Port Act. This classification seems to be used for port administration as the matter of convenience but some qualitative grouping is needed for research of port-related matters. The aim of this paper is to cluster 28 foreign trade ports as per the similar characteristics by Hard C-Means and to analyze the results of this clustering.

• 한국항만경제학회지
• /
• 제33권4호
• /
• pp.37-58
• /
• 2017

설문조사 및 응답자의 지각을 바탕으로 하는 항만선택연구의 암묵적인 가정은 항만선택속성들의 선호크기가 선택행위에 비례적이라는 것이다. 그러나 항만선택 속성들도 직선만이 아닌 비선형적 특성을 갖을 수 있다. 본 연구는 항만선택연구에 성격이 유사한 카노모형을 원용하여 항만선택속성의 비선형적 특성을 확인 하였다. 연구결과 선사의 항만선택속성들중 복합운송연계성과 항만규모 등이 당연특성으로 평가되는 등 여러 속성들이 비선형적 특성으로 평가되었다. 따라서 항만공사와 운영사 등의 항만 서비스제공자들은 선사들의 비선형적 항만선택특성을 반영한 항만운영전략을 구축해야 할 것이다. 본 연구가 항만선택 특성을 탐색적으로 분석하였기 때문에 추후 국내외 항만 및 이해당사자들을 대상으로 한 추가적인 검증연구가 필요하다. 또한 분석 및 전략수립에 활용한 카노모형 및 중요도 선택분석방법도 명확한 특성의 파악과 전략지침의 제시가 가능하도록 개선할 필요가 있다.

• 한국자동차공학회논문집
• /
• 제8권2호
• /
• pp.9-18
• /
• 2000

Combustion and emission characteristics in a direct injection diesel engine is closely related to the intake port system. It is therefore important to understand the swirl flow characteristics formed by a helical intake port. However there are still many uncertainties. The purpose of this experimental study is to investigate the effects of the valve eccentricity ratio and the inlet flow conditions of a helical intake port on the characteristics of an in-cylinder swirl flow. A steady state flow test rig consisted of ISM(impulse swirl meter), LFM(laminar flow meter) and cylinder head with a helical intake port was used. The swirl ratio(Rs) and mean flow coefficient(Cf(mean)) with inlet flow conditions were measured. The results of these experiment can be summarized as follows. Swirl flow characteristics of a helical intake port are affected by the inlet flow conditions, and especially they are much affected by the length of a manifold runner and the rotational angle of a curved manifold runner.

• 한국자동차공학회논문집
• /
• 제5권5호
• /
• pp.157-169
• /
• 1997

The effects of intake port eccentricity on the characteristics of in-cylinder swirl ratio in a 4-valve diesel engine having the two intake ports; one is a helical intake port and the other is a tangential intake port were investigated by using the ISM(impulse swirl meter) in steady flow test rig. Swirl ratio($R_s$) and mean flow coefficient($C_{f(mean)}$) with valve eccentricity ratio($N_y$) and axial distance(Z/B) were measured. As the results from this experiment, the characteristics of in-cylinder swirl ratio formed by a 4-valve cylinder head were largely affected by intake port eccentricity. There is a difference in the mass flowrate through the two intake ports, and the mass flowrate through the tangential intake port is 19% more than that of the helical intake port. Therefore, we could know that the effects of the mass flowrate ratio through each intake port besides intake port shape should be conidered.

• 대한토목학회논문집
• /
• 제36권1호
• /
• pp.169-180
• /
• 2016

항구도시에서 항만과 도시공간은 상이한 공간특성을 가지고 있지만 서로 상호의존적으로 발전되어 나가야 한다. 기능쇠퇴로 인한 기존 공간의 장소성 상실과 기능 저하는 도시 전체의 이미지를 나쁘게 만들 뿐만 아니라 나아가 지역 경제부흥에도 좋지 않은 영향을 미치고 있다. 이에 일부 선진국에서는 시대변화에 따른 항만공간 특성 및 기능의 변화로 인해 낙후되어가는 항만공간에 대한 연구를 오래전부터 지속적으로 진행해 오고 있다. 본 연구에서는 항만배후단지에 항만과 도시공간 사이의 완충지 역할을 할 수 있는 항만도시 인터페이스 공간의 특성 적용하여 향후 국내 항만배후단지가 주변 공간특성과 항만도시 인터페이스 특성이 부여된 효율적인 공간으로 활용되기 위한 방안을 모색하고자 한다.

• 무역학회지
• /
• 제46권6호
• /
• pp.39-54
• /
• 2021

This study comprehensively reviews the research conducted until recently in order to derive realistic alternatives in consideration of local industries. The case analysis was performed on a competitive port of similar size, and strategies and revitalization measures were suggested in consideration of the conditions of Gunsan Port. Literature review focused on papers and major reports. The case of similar size were analyzed for Daesan port, Boryeong port, and Mokpo port. In order to find strategies to revitalize the regional port logistics industry behind Gunsan Port, the recent opportunities and threat factors of Gunsan Port were derived. In order to foster the regional port logistics industry with Gunsan Port as its main base, this study proposes a three-step development strategy. It is necessary to increase the effectiveness of the public-private joint port sales and maintain the incentive system, but use it as a means to strengthen the competitiveness of Gunsan Port. Since the possibility of opening various routes is not high due to the conditions of Gunsan Port, various business models can be devised to link the currently opened routes. Start-up in the logistics field can stand out if they provide predictive data or provide consulting services by securing and analyzing logistics data, not directly providing logistics services.

• 대한건축학회논문집:계획계
• /
• 제34권3호
• /
• pp.35-44
• /
• 2018

The purpose of this study is to elucidate the formation process and spatial characteristics of the first and largest open port of Foreign Settlement in Yokohama, Japan. Based on the reference records and maps, we traced the process of modernization, example of opening the park and introduction of technology, industrial & infra-structural facilities. And found out the characteristics of formation process of port city Yokohama as the modernized city. The results of this study are as follows: First, the spatial characteristics and significance of the public space of the port open space; second, the difference of the road and parcel systems between the Japanese and the foreign settlements; and third, the meaning of the port open space as the space of separation in that times. These experiences about the open port in Yokohama could be worked as the basic for domestic and colonial city planning.

• 한국해양공학회지
• /
• 제14권3호
• /
• pp.11-19
• /
• 2000

This study aims to examine the characteristics of the water quality variation in relation to the change of water exchange rate with respect to the development phases of the Pusan port. To clarify the characteristics, water exchange caused by the variations of coastline shape and water surface area was examined by the numerical experiments using the Lagrangian particle tracking model based on 2-D shallow water equation. As the results of numerical experiments, it was proved that the water exchange in the Pusan port was decreased mainly due to the port development and the breakwaters construction. During the port development phases from 1875 to 1998, 35% of the sea-space in the port had decreased to make hinterland spaces. This resulted in the loss of wet-land and coastline change as well as decrease of the water exchange rate at the sea side. The city population in that period had rapidly increased from several thousands to 4 millions, resulting in the large discharge of sewages into the port area. Under the these environmental conditions, it can be clearly said that the water quality in the Pusan port is sensitively affected by the discharge of urban sewages decrease of the water exchange rate in relation to port and urban developments. In the study, the temporal changes of water quality were discussed with respect to the port development phases. It was clear that the water quality wad controlled by the exchange rate change under the port development as well as the input impact into the port from the urbanized city area. To make clean sea of the Pusan port, it is suggested that the sewage control, the water exchange and coastline control should be systematically checked under the concept of eco-friendly development and environmental management.

• 한국지능시스템학회:학술대회논문집
• /
• 한국퍼지및지능시스템학회 2000년도 추계학술대회 학술발표 논문집
• /
• pp.129-132
• /
• 2000

Grouping ports in certain region by their characteristics could be used as the principal informations to establish national policy for port development or investment and also to analyze the competitiveness between ports. Currently Korean ports are divided into two groups such as the local port and the designated port containing foreign trade port and coastal port under the Korean port law. These divisions seem to be used for port administration as the matter of convenience but some qualitative grouping is needed for research of port problems. In this paper, 28 major Korean ports were clustered by the similar characteristics using Fuzzy C-Means and found to be classified 8 qualitative groups.