• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.10a
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• pp.683-684
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• 2013

• Journal of Korean Port Research
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• v.13 no.1
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• pp.87-100
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• 1999

This study was focused on analyzing the headway of various types of trailer in Pusan city with the high heavy vehicle rate. Then Passenger Car Equivalent(PCE) was calibrated in order to identify the impact of trailers in the traffic flow at the signalized intersections. To fulfill this goal types of trailer were classified into five categories such as full trailer semi-trailer unloaded semi-trailer semi-trailer loaded with 20ft container and semi-trailer loaded with 40ft container and Passenger Car Equivalents were identified. the Results are as follows: 1) The PCE’s were 2.64, 1.51, 2.09, 2.16 and 2.23 respectively. 2) The saturation flow rate on the signalized intersection was lower than that on the multi-lane highway in the big city of Korea. 3) The start-up delay on the thru lane was similar to the average value in our country but the start-up delay on the left-turn lane was longer than the average value in our country by the impact of container Vehicles.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.15 no.4
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• pp.207-213
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• 2003

This study is to numerically investigate the characteristics of wave energy variations propagating over impermeable submerged breakwaters with irregular waves. Two-dimensional numerical wave flume based on the VOF method was used. VOF method is the most efficient capable of simulating free surfaces including wave breaking. From the computed frequency spectrum results, wave breaking play important role in ability of the submerged breakwaters to dissipate incident wave energy. In case of occurring wave breaking, our analysis shows that wave energy moves to short wave period on one-row impermeable submerged breakwater's lee side and is widely distributed not having peak period on two- row impermeable submerged breakwater's lee side.

• Journal of Korea Water Resources Association
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• v.47 no.8
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• pp.685-691
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• 2014

River bank filtration techniques seek to improve river water quality via natural processes occurring when river water is induced to a river bank. When water is pumped from multiple wells, phenomenon known as well interference affect pumping rates. Pumping wells of a bank filtration facility are connected by pipelines. In theses cases well interference is caused not only by groundwater drawdown but also by pipe headloss which depend on flow rates. In this work a comprehensive analytical method which handles groundwater flow and pipe flow is used to evaluate interferences and ratios of river water in pumping wells. A realistic case was used as an example.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.3
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• pp.440-447
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• 2012

Numerical model experiments of wave transformation due to the reclamation and the construction of breakwater in case of 50 years design wave were performed using time dependent mild slope equation included shoaling, refraction, diffraction, reflection and wave breaking. As waves propagate to the shore, wave height gradually diminishes by the bottom friction and wave breaking etc.. After the reclamation and the construction of 75 m length breakwater, wave height distributions in the lee of breakwater have the range of 29~128 cm. To make better the harbor tranquility the length of breakwater needs to extend more than 100 m. After the construction of breakwater, wave height in the lee of the structure was deduced over 80%.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.10 no.2
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• pp.83-92
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• 1998

To evaluate the hydraulic resistance behind bodies in a large scale grid numerical model, a drag stress term which is formulated by the drag force is introduced in the depth-integrated Reynolds equations. And also, the applicability and problems of this model are discussed through various numerical experiments where the analytical solutions exist. In the case of a single body, the error range of velocity difference between analytical and numerical solutions is within $\pm$10% and the wake width behind the body shows a good agreement with the analytical solution. When the drag coefficient and the eddy viscosity are precisely decided, the numerical solutions behind a row of bodies will be efficiently used in real situations.

• Journal of Korean Society of Transportation
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• v.28 no.1
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• pp.7-14
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• 2010

As globalization is making rapid progress, place of international trade based on seaports is changing to airports, which make logistic function in airport getting more important. Airports are required to serve as social overhead capital representing economies of scale as well as a logistic hub for integrating production, sales and transport for multinational corporations. In order to keep regional airport hub, many strategies are required such as development of hinterland and competitive advantage strategies. This paper tried to find determining factors to be a hub airport and competitiveness for hubbing, using the data from Incheon, Narita, Kansai, Nagoya, Singapore-Changi and Taipei airports. As the result of making an analysis of competitiveness of airports and competitive ranking excluding hinterland factors.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.12 no.1
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• pp.27-38
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• 2000

The collapses and settlement of harbor facilities from earthquakes were known due mostly to liquefaction of reclaimed land. The most harbor quay wa1ls being designed as gravity types in Korea are known susceptible structures to liquefaction because reclaimed land was not treated resistant to earthquake. In this study, liquefaction susceptibility of reclaimed land behind a large quay walls under construction to earthquake was predicted and its stability was analyzed. In addition, liquefaction prediction methods in harbor facilities specification adopted by both Korea and Japan were compared by applying the methods to prediction of liquefaction susceptibility of reclaimed land, respectively.

• Journal of Korea Water Resources Association
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• v.31 no.4
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• pp.449-457
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• 1998

Using a numerical model solving the shallow-water equations, unusual huge run-up heights observed in the lees of both Babi and Okushiri islands were investigated in detail. The effects of incident tsunami widths were particularly examined by adjusting the transverse length of the wave-maker in laboratory and numerical experiments. The calculated run-up heights were compared with the laboratory experimental data. It has been found that the run-up heights in the lee of a conical island are strongly dependent on the ratio of a transverse length of incident tsuanmis to a base diameter of the island. Keywords : shallow-water equations, tsunami, run-up height, conical island.

• Journal of the Korean Geographical Society
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• v.46 no.6
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• pp.751-766
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• 2011

This study aims to grasp the hierarchy in the influence areas of port by the intensity of freight shipments and to seek the activating methods for the increase of export and import volumes of Pyeongtaek and Dangjin port. Pyeongtaek and Dangjin port whose major import and export freights are natural gas and automobile, were constructed for the increasing trade with People's Republic of China. This port is expanding the influence in the hinterland and foreland of the port, but core influence area of Pyeongtaek and Dangjin port is rich in trade volume within the radius of 70km. To become international as well as national ports, Pyeongtaek and Dangjin is required to execute the active policy to receive many-sideness of sea route and the recognition of freight holders, forwarders and ship companies in many regions.