• Journal of Korean Society of Transportation
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• v.26 no.1
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• pp.25-35
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• 2008

The ridership and transit systems are influenced by the expansion of metro-rail in Seoul metropolitan area. However, it has been difficult to measure its precise quantitative influences. Also effective policy implementations have been limited due to the lack of practical evidences. Thus an empirical analysis for an operating metro-rail is essentially required. In this regard, this study examines the impact of the Jungang line on transportation system, whose metro-rail block has been recently started new service. The main interest of this study is to find out the changes of ridership and to forecast the ridership changes by the metro-rail service. The results indicate that the effect on auto users is less than that of bus users. The auto demand is decreased by 33.3% and the bus demand by 66.6%. Additionally, its influence on Gyeonggi-do bus was greater compared with that on the Seoul bus. From questionnaire survey, this results could be confirmed. To sum up, the metro-rail gives less influences on auto users, while it gives greater influences on bus users.

• The Journal of Aerospace Industry
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• s.70
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• pp.40-69
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• 2008

정부는 그동안 항공정책을 수립하고 시행함에 있어서 '항공운송'과 같은 경쟁력 있는 부문만을 특정하여 중장기적인 발전전략을 수립하여 온 것이 사실이다. 지방공항은 처음부터 물적, 인적 자원을 수송하는 규모나 주변 환경여건에 있어 국제공항을 따라갈 수 없는 일정한 한계를 가지고 있다. 지방공항의 적자문제를 국제공항의 목표치에 두는 것 자체가 이치에 맞지 않기 때문이다. 그러므로 지방공항은 국제공항과는 다른 관점의 항공 정책이 절대적으로 필요하다. 국가전체의 운송기능 향상을 위한 종합적인 대책도 지방 공항에 적용할 필요가 있지만 지방 공항 고유의 지방자치단체와의 협력을 통한 특색 있는 공항 역할을 재정립하는 것도 필요한 것이다. 한편 항공 스포츠의 역사는 60여년에 이르고 있으나 정부 관련기관의 관심 부족과 활성화 하려는 의지부족으로 여전히 침체되어 있는 것이 사실이다. 그런데 본 연구에서 항공 스포츠의 특징상 공항과의 연계성을 검토하여 보니 상당히 긍정적인 Win-Win 전략이 될 수 있을 뿐 아니라 지방공항과 항공 스포츠 양자가 실제 활성화될 수 있는 공항정책이 구체화될 수 있음을 알게 되었다. 다만 항공 스포츠에도 종목이 다양하므로 지방공항의 특성상 적정한 스포츠 항목과의 연계가 요구된다. 그리하여 본 연구는 항공 스포츠를 활용한 지방공항 활성화 방안으로 항공 스포츠에 적합한 지방공항 요건을 접근성, 안전성, 편의성으로 나누어 검토하고 지방공항과 접목 가능한 항공 스포츠를 제시하고자 하는 가설을 설정하였다. 더 나아가 항공 스포츠를 통한 지방공항 활성화의 기대효과로서 지방공항의 활성화, 지방연계산업의 활성화, 지방공항의 발전 가능성에 대한 가설을 설정하였다. 본 논문은 지방공항 활성화를 위한 전략체계를 항공스포츠 동호인 즉 조종자들의 기지선택 요인을 중심으로 실증분석을 통하여 정리하였고, 일반인들의 인식과 전문가 의견을 토대로 지방공항의 활성화를 위하여 항공스포츠와 전략적 제휴를 하고자 할 경우 관련기관들이 고려할 부분과 운영체계 개선방안을 제시함으로써 구체적인 정책적 제언이 될 수 있도록 하였다.

• Journal of Korea Port Economic Association
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• v.32 no.4
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• pp.41-56
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• 2016

China is pushing a policy called China's Western Development in order to balance the continent's development level. They are connecting the rich natural resources of the mid-western areas and the capital of the eastern coastal areas of China. Since Korea depends on China the most for trade, it is necessary for Korea to always consider the trade scale and pattern changes of China. Response to changes in the transport and logistics system between the two countries is also demanded. This study aims to analyze the import and export trends between Korean and Chinese provinces of each item from the trade scale point of view. China's global trade routes reorganization and China's western development are considered and the corresponding direction is presented accordingly. The study also suggests strategies to expand the import and export scale with China based on the analysis.

• Journal of Navigation and Port Research
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• v.31 no.8
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• pp.717-723
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• 2007

In recent years, the transportation sector has been undergoing very rapid and multifarious changes due to the M&A, alliances between shipping companies, introduction of larger container ship as it cost reduction measure and the application of integrated logistics to satisfy the needs of customers. Therefore, container terminal is required adequate terminal facilities, sufficient channel depth, efficient handling and low cost of port fees and dues. The purpose of this paper is for functional assessment of efficient container terminal. Firstly, the container operating process information about yard equipment and chassis is extracted through the analysis of practical daily work report of container terminal. Also, the formulae of skill factor and troubles of operator on transfer crane are defined. Lastly, container handling simulation model which consideration of skill factor and trouble of operator is proposed by Petri network model.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.18 no.1
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• pp.35-42
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• 2006

Recently, the harbor function is being reconsidered with the viewpoint of logistics, and various efforts are given to enhance the harbor performance agglomerating all procedures of stevedoring, treatment and background transportation of freight. The harbor performance largely depends on the efficient combination of the engineering part of harbor construction and the forthcoming logistics part. It may thus be anticipated in the future that the design concept of harbor construction will be transferred to a comprehensive consideration integrating both engineering and logistics parts to maximize the ultimate harbor operational performance. In the present study, various indicators for assessing a modem container terminal performance are presented far the purpose of helping harbor engineers understand the fundamental logistics through container handling operations. The indicators are compared, analyzed and compiled, by referring to the practical cases of Busan and Gwangyang ports as an illustration.

• Water for future
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• v.29 no.1
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• pp.191-202
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• 1996

Advanced water treatment for water supply is being introduced for the treatment of various organic materials which cannot be removed by conventional water treatment methods. While the development of advanced water treatment system appropriate to the domestic enviropment of advanced water treatment system appropriate to the domestic environment is essential, the study on the economic costs and the social impact is also of importance. In this paper, it is shown how to estimate the costs (capital and maintenance) for advanced water treatment facilities, especially those using ozone treatment combined with activated carbon process and membrance separation. Estimated costs were compared with the government budget. Also, a general relation between the system capacity and investment was derived. Four alternatives were considered form the aspect of the amount of water to be produced and the delivery system to the user. These alternatives were applied to the city of Pusan. It turned out that bottled water, produced only for drinking, has best economic advantages in having minimum system capacity without detriment to water quality.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.29 no.5
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• pp.217-227
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• 2017

The object of this study is to estimate the net volume transport and the residual flow that changed by space and time at southern part of Yeomha channel, Gyeonggi Bay. The cross-section observation was conducted at the mid-part (Line2) and the southern end (Line1) of Yeomha channel for 13 hours during neap and spring-tides, respectively. The Lagrange flux is calculated as the sum of Eulerian flux and Stokes drift, and the residual flow is calculated by using least square method. It is necessary to unify the spatial area of the observed cross-section and average time during the tidal cycle. In order to unify the cross-sectional area containing such a large vertical tidal variation, it was necessary to convert into sigma coordinate system by horizontally and vertically for every hour. The converted sigma coordinate system is estimated to be 3~5% error when compared with the z-level coordinate system which shows that there is no problem for analyzing the data. As a result, the cross-sectional residual flow shows a southward flow pattern in both spring and neap tides at Line2, and also have characteristic of the spatial residual flow fluctuation: it northwards in the main line direction and southwards at the end of both side of the waterway. It was confirmed that the residual flow characteristics at Line2 were changed by the net pressure due to the sea level difference. The analysis of the net volume transport showed that it tends to southwards at $576m^3s^{-1}$, $67m^3s^{-1}$ in each spring tide and neap tide at Line2. On the other hand, in the control Line1, it has tendency to northwards at $359m^3s^{-1}$ and $248m^3s^{-1}$. Based on the difference between the two observation lines, it is estimated that net volume transport will be out flow about $935m^3s^{-1}$ at spring tide stage and about $315m^3s^{-1}$ at neap tide stage as the intertidal zone between Yeongjong Island and Ganghwa Island. In other words, the difference of pressure gradient and Stokes drift during spring and neap tide is main causes of variation for residual current and net volume transport.

• Journal of Korean Society of Transportation
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• v.34 no.4
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• pp.304-317
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• 2016

The advancement in technology including transportation and information communication has accelerated the flow of supplies, and the importance of the national logistics policy has increased following the expansion of the regional range of logistics to a national range. The rapid growth of the domestic logistics market results in the deficit of logistics facilities, inefficient operation of logistics facilities, and a complicated distribution structure. It has precipitated a plan aimed at efficiency improvement by building base logistics facilities, but this market is now undergoing difficulties due to low performance. Many studies on the revitalization of base logistics facilities have been conducted, but a causal analysis focusing on the function overlap of private logistics businesses has been absent. Therefore, this study has analyzed the function overlap of logistics facilities and the irrationality of the system, which resulted from the lost function of Inland Freight bases in the Yeongnam region. By suggesting the cause of disuse of base logistics complexes from the function overlap in the ground transportation of domestic freight, the study can provide the policy implication for the national logistics infrastructure.

• Journal of Life Science
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• v.26 no.7
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• pp.758-763
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• 2016

Fatty acid transporters are key mediators of skeletal muscle lipid metabolism. Several protein groups have been implicated in cellular long-chain fatty acid uptake or oxidation, including fatty acid transporter proteins (FATPs), the plasma membrane fatty acid-binding protein (FABPpm), and the fatty acid translocase (FAT/CD36). FAT/CD36 is highly expressed in skeletal muscle and known to be regulated by various factors such as exercise and hormones. Insulin-like growth factor-I (IGF-I) is a well-known regulator of skeletal muscle cells. However, it has not been studied whether there is any interaction between IGF-I and FAT/CD36 in skeletal muscle cells. In this study, the effects of IGF-I treatment on FAT/CD36 induction were examined. Differentiated C2C12 cells were treated with 20 ng/ml of IGF-I at different time points. Treatment of C2C12 cells with IGF-I resulted in increased FAT/CD36 mRNA and protein expression. After 24 and 48 hr of IGF-I treatment, FAT/CD36 mRNA increased 89% and 24% respectively. The increase of both proteins returned to the control level after 72 hr of IGF-I treatment, suggesting that the FAT/CD36 gene is regulated pretranslationally by IGF-I in skeletal muscle cells. These results suggest that IGF-I can regulate the expression of FAT/CD36 in skeletal muscle cells. In conclusion, IGF-I induces a rapid transcriptional modification of the FAT/CD36 gene in C2C12 skeletal muscle cells and has modulating effects on fatty acid uptake proteins as well as oxidative proteins.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.25 no.2
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• pp.41-51
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• 2013

The tidal creek dependent mass transport characteristic in Gyeong-Gi Bay (west coast of Korea) was studied using field measured data and numerical model. Gyeong-Gi Bay consists of 3 main tidal channels and contains a well-developed vast tidal flat. This region is famous for its large tidal difference and strong current. We aim to study the effect of tidal creek in the tidal flat on the mass exchange between the estuary and the ocean. For numerical application, the application of unstructured grid feature is essential, since the tidal creek has complicated shape and form. For this purpose, the FVCOM is applied to the study area and simulation is performed for 2 different cases. In case A, geographic characteristics of the tidal creek is ignored in the numerical grid and in case B, the tidal creek are constructed using unstructured grid. And these 2 cases are compared with the field measured cross-channel mass transport data. The cross-channel mass transport at the Yeomha waterway mouth and Incheon harbor was measured in June, 9~10 (Spring tide) and 17~18 (Neap tide), 2009. CTD casting and ADCP cross-channel transect was conducted 13 times in one tidal cycle. The observation data analysis results showed that mass transport has characteristic of the ebb dominance Line 1 (Yeomha waterway mouth), on the other hand, a flood dominant characteristic is shown in Line 2 (Incheon harbor front). By comparing the numerical model (case A & B) with observation data, we found that the case B results show much better agreement with measurement data than case A. It is showed that the geographic feature of tidal creek should be considered in grid design of numerical model in order to understand the mass transport characteristics over large tidal flat area.