• Journal of Navigation and Port Research
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• v.31 no.3 s.119
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• pp.165-172
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• 2007

Logistics needs in Asia are surprisingly increasing due to rapid growth of China in Northeast Asia We are endeavoring to make an economic block in opposition to NAFTA and EU by economic revival, political stability, and easing of exclusive parts between countries as increasing of traffic infra such as asian highway, transcontinental railway in the region of Northeast Asia and as considering diversification of transportation mode. Now, Busan is not a final terminal of this business, and it is not a concreted level in considering an undersea tunnel between Korea and Japan as effort to extend to Japan. Therefore, this study performed an effect analysis which be affected to Northeast Asia and Korea in future by analysis and comparison of a cost and time required of marine transportation and railway before and after construction through course analysis and summary of discussed content until now for undersea tunnel between Korea and Japan. This result expects as a accelerative play for study cf undersea tunnel between Korea and Japan in future. In this result, we estimate that it is an effective things in a cost and time required if undersea tunnel between Korea and Japan is constructed, and we simply searched for theirs effects in the aspects of Northeast Asia, national balanced development, regional economic in Busan, and marine logistics.

• Journal of Navigation and Port Research
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• v.31 no.3 s.119
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• pp.235-245
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• 2007

Stiffened steel plates are basic structural members on the deck and bottom structure in ship, offshore. It has a number of one sided stiffeners in either one or both directions, the latter structure was called grillage structure. At the ship structural desgn stage, one of the major consideration is evaluation for ultimate strength of the hull girder. In general, it is accepted that hull girder strength can be represented by the local strength of the longitudinal stiffened panel. In case of considering hogging condition in a stormy sea, stiffened panel was acting on the bottom structure under axial compressive load induced hull girder bending moment, also simultaneously arising local bending moment induced lateral pressure load. In this paper, results of the structural analysis have been compared with another detailed FEA program and prediction from design guideline and a series analysis was conducted consideration of changing parameters for instance, analysis range, cross-section of stiffener, web height and amplitude of lateral pressure load subjected to combined load (axial compression and lateral pressure load). It has been found that finite element modeling is capable of predicting the behaviour and ultimate load capacity of a simply supported stiffened plate subjected to combined load of axial compression and lateral pressure load It is expected that these results will be used to examine the effect of interaction between lateral pressure and axial loads for the ultimate load-carrying capacity based on the Ultimate Limit State design guideline.

• The Korean Journal of Air & Space Law and Policy
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• v.27 no.2
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• pp.167-192
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• 2012

Aviation industry is known as the knowledge-based one and as an advanced nations' exclusive property having a large capacity for creating job and added value. Considering the current status of the aviation industry as aforesaid, it is natural for all countries to turn their attention to such promising aviation industry. At the time of rapid growth in aviation market, the importance of securing managerial experts and technicians is being under the spotlight as the aviation profession is increasingly in demand. To meet such dire needs that have already become an ever-greater part of the industry, collaboration among governmental, educational and industrial parties has formed in preparation for putting us into so-called an era of globalization. Having recognized the significance of the program, carried forward by The Ministry of Land, Transport and Maritime Affairs, fostering human resources in civil aviation, the objective of this study lies on deloping indicators for the programofficially designed to produce men of expertise in international air transport, the market of which forms nowadays a large part of national economy, and the technology of which develops so quickly. In this paper, an effort is made to develop the appraisal indicators and to set up standards thereof in order for the program to be systematically and expertly assessed on the basis of Quinn and Rohrbaugh's the competing values model. Firstly, this paper designs appraisal indicators, taking into account the peculiarity and environment of air transport industry, for developing human resources in civil aviation by utilizing advanced research on educational assessment in general due to the absence of applicable preceding studies regarding the development of human resources in civil aviation. Secondly, investigations into the necessity and validity of the appraisal are committed by analyzing answers from 100 respondents to questionaires and oral surveys in order to verify appraisal indicators designed in accordance with the competing values model. Lastly, the paper analyzes in a demographical way discrepancy in the recognitions among institutions for which the respondents work, on the basis of the outcome of the survey. As a result, the discrepancy is found not significant, which indicate that the aviation experts favour the indicators as appraisal standards. Prospective studies on the same issue may need an in-depth analysis, empowered by sufficient sampling in balance, of correlation between independent variables, then hopefully serve as a momentum for advancement of study in civil aviation.

• Journal of Navigation and Port Research
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• v.37 no.1
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• pp.101-111
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• 2013

The following study holds its purpose on verifying primary fun factors of participation and satisfaction on marine sports. The results are: 1)The efficiency, effectiveness of exercise, self-satisfaction, and family support turned out to be higher in the group with longer and higher period, time, and frequency of participation than those of the control group. 2) The period of participation, speculation on engagement according to the frequency, and behavioral factors were shown to be higher in the group with longer and higher period, time, and frequency of participation than those of the control group. 3) Satisfaction on leisure on social, physical, emotional, and educational means were higher in the group with longer and higher period, time, and frequency of participation than those of the control group. 4) The fun factors of marine sports- self-satisfaction, effectiveness of excercise, efficiency, and family support- had a positive effect on increasing satisfaction in leisure. 5) The fun factors of marine sports- effectiveness of excercise, self-satisfaction, and family support- had a positive effect on increasing satisfaction in leisure. 6) The speculation of engagement in sports and the reinforcement of engagement had a positive effect on increasing satisfaction of leisure.

• Journal of Navigation and Port Research
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• v.38 no.4
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• pp.409-419
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• 2014

In accordance with the global age, countries in the world try to dedicate to collaboration among them through ODA (Official Development Assistance), in order to solve the-rich-get-richer and the poor-get-poorer problems among countries, to develop the developing countries' economies, and to improve their level of social welfare. Also, Korea is so active in ODA as a member of OECD, even if it is in the initial process. Nowadays, in Korea, the importance of ODA in the field of port has been brought into relief. Accordingly, the paper intends to analyze the dilemma structure of port ODA from the perspectives both of new institutionalism and Samaritan's dilemma game, and it tries to seek the improvements of ODA institutions to create effective outcomes based on the analysis. Through the analysis, dilemma structure was identified regarding the institutions of port ODA. And the results of the analysis suggested the improvements of port ODA institutions including strengthening of on-the-spot aid system, establishment of payoffs system for inducing recipient countries' efforts, and institutionalization of reliable threat. It would contribute to develop the theoretical model of ODA analysis and create effective outcomes of ODA in the field of ports.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.35 no.1
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• pp.1-8
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• 2015

Wind power systems have gained much attention due to the relatively high reliability, good infrastructures and cost competitiveness to the fossil fuels. Advances have been made to increase the power efficiency of wind turbines while less attention has been focused on structural integrity assessment of structural sub-systems such as towers and foundations. Among many parameters for integrity assessment, the most perceptive parameter may be the induced horizontal displacement at the hub height although it is very difficult to measure particularly in large-scale and high-rise wind turbine structures. This study proposes an indirect displacement estimation scheme based on the combined use of inclinometers and accelerometers for more convenient and cost-effective measurements. To this end, (1) the formulation for data fusion of inclination and acceleration responses was presented and (2) the proposed method was numerically validated on an NREL 5 MW wind turbine model. The numerical analysis was carried out to investigate the performance of the propose method according to the number of sensors, the resolution and the available sampling rate of the inclinometers to be used.

• Journal of fish pathology
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• v.26 no.2
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• pp.89-97
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• 2013

The study was carried out to investigate the changes of hematological parameters induced by waterborne exposure of chromium (Cr) in the mullet, Mugil cephalus. The mullet was exposed to sub-chronic concentrations of chromium (0, 25, 50, 100, $200{\mu}g/L$ Cr) for 4 weeks. The major hematological findings were significant decreases in the red blood cell (RBC) count and hematocrit value in mullet exposed to ${\geq}50{\mu}g/L$ Cr. Although serum calcium concentration was significantly reduced at ${\geq}50{\mu}g/L$ Cr, magnesium concentration was found to be significantly increased at ${\geq}100{\mu}g/L$ Cr. The serum glucose and total protein concentrations were significantly increased at $200{\mu}g/L$ Cr. However, serum triglyceride concentration did not show any noticeable changes in the range of $25{\sim}200{\mu}g/L$ Cr of chromium compared to control group during the experimental period. A significant increment of GOT (glutamic oxalate transminase) and GPT (glutamic pyruvate transminase) activities was noticed at ${\geq}100{\mu}g/L$ Cr. These results indicate that hematological and serum biochemical changes in the mullet by waterborne exposure to chromium are affected at more than $50{\mu}g/L$ Cr.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.1
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• pp.363-375
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• 2013

Today, a shortage of the skilled operator has been intensified gradually and the necessity of an earthwork in extreme environment operators are difficult to access is increasing for the purpose of resource development and new living space creation. For this reason, an effort to develop an unmanned excavation robot for fully automated earthwork system is continuing globally. In Korea, a research consortium called 'Intelligent Excavation System' has been formed since 2006 as a part of Construction Technology Innovation Program of Ministry of Land, Transport and Maritime Affairs of Korea. Among detailed technologies of the Task Planning System is one of the core technologies of IES, this paper explains research and development process of the Local Area Design Module, which provides informatization unit to create automated excavators' work command information at operation level such as location, range, target, and sequence for excavation work. Designing of Local Area should be considered various influential factors such as excavator's specification, working mechanism, heuristics, and structural stability to create work plan guaranteed safety and effectiveness. For this research, conceptual and detail design of the Local Area is performed for analyzing design element and variable, and quantization method of design specification corresponding with heuristics and structural safety is generated. Finally, module is developed through constructed algorithm and developed module is verified.

• Strategy21
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• s.40
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• pp.216-234
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• 2016

본 논문은 자위권 사용과 군사력 사용 간의 관계를 분석하고 이를 한반도 서해에서의 한국과 북한 간 해상긴장 상황에 적용시킨 이슈를 다룬다. 국가가 행사하는 자위권(self-defense: 自衛權)은 기본적으로 전쟁 방지를 위한 기본적 원칙이다. 그러나 이는 군사력 사용(Use of Forces: 軍事力 使用) 또는 무력행사(武力行事)이라는 측면에서 칼의 양날과 같은 결과를 낳는다. 즉 자위권 행사로 전쟁의 확산을 방지하는 반면에 자위권 행사로 상대방에 대한 적성(敵性)을 인정해 주는 경우이다. 반면 북한의 군사도발은 전방향적이며, 1953년 한반도 정전협정 위반이다. 1953년 정전협정 체결 이후 양국은 서해 북방한계선(NLL)에서의 군사적 충돌을 거쳤으며, 이는 과연 한국이 자위권 차원에서의 방어태세와 군사력 사용 측면에서의 대응태세 간에 괴리가 존재하고 있다는 것으로 나타나고 있다. 당연히 피해를 받는 곳은 한국이며, 이는 서해 북방한계선에서의 남북한 해군 간 대결국면에서 나타나고 있다. 이에 본 논문은 자위권을 국가 차원 행사하는 수준과 작전에 투입된 현장 작전 지휘관 차원에서 행사하는 수준으로 구분하여 다룬다. 서해 북방한계선 부근 수역에서의 북한의 해상 군사도발에 대해 현장 작전 지휘관이 행사하는 자위권은 대한민국 정부 차원에서의 자위권 행사와는 다르면, 이 문제를 국제법을 중심으로 분석하기에는 너무나 많은 제한점이 있다. 현행 국제법상 국가 자위권 문제는 군사력을 동반하는 문제로서 그 행사요건이 매우 애매모호하고 까다롭다. 그러나 현장 작전지휘관의 자위권 행사는 단호해야 하며, 이는 군사력 운용으로 나타나야 한다. 실제 서해에서의 남북한 대결국면에서의 대한민국 해군의 자위권 행사는 정전협정에 의거 제한되고 있으며, 이는 2010년 북한의 천안함 침몰과 연평도 폭격도발 시 대한 민국 해군과 해병대의 대응에서 증명되었다. 현재 대한민국 국방부는 현장 작전 지휘관에서 소위 '선제적 자위권 행사' 부여 필요성에 대한 논의를 진행 중으로 알려져 있다. 이에 따라 선제적 자위권 행사를 위한 조치들을 제도화하는 움직임을 보이고 있다. 예를 들면 2013년 발표된 대한민국 합참과 유엔사령부/한미 연합사령부/주한미군사령부 북한 군사 도발에 대한 대응계획(ROK JCS and UNC/CFC/USFK Counter-Provocation Plan)이 이를 간접적으로 증명하고 있다. 선제적 자위권은 행사에 있어 몇 가지 원칙을 요구하고 있으며, 이에 대한 합법성 문제는 아직 해결되고 있지 않다. 따라서 이 문제와 북한 군사도발 시에 대한 대한민국의 선제적 자위권 행사 간 연관성 문제를 어떻게 해석할 수 있는가에 대한 연구가 필요한 실정이다. 평시 군사력 사용에 따른 무력행사의 적법성은 그 인정이 대단히 어려운 것이 현실이며, 이에 따라 북한의 군사도발에 대한 가장 효율적 방안이 선제적 자위권이라면, 이에 대한 법적 대응이 무엇인가에 대한 제도적 근거를 필요로 할 것이다.

• Journal of Ocean Engineering and Technology
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• v.33 no.6
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• pp.518-525
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• 2019

Recently, the Sub-Committee on SDC (Ship Design and Construction) of IMO have discussed actively the technical issues associated with the second-generation intact stability criteria of ships. Generally, second generation intact stability criteria refer to vulnerability five modes ship stability which occurs when the ship navigating in rough seas. As waves passes the ship, dynamic roll motion phenomenon will affect ship stability that may lead to capsizing. Multi-tiered approach for second generation of intact stability criteria of IMO instruments covers apply for all ships. Each ship is checked for vulnerability to pure loss of stability, parametric roll, and broaching/surf-riding phenomena using L1(level 1) vulnerability criteria. If a possible vulnerability is detected, then the L2(level 2) criteria is used, followed by direct stability assessment, if necessary. In this study, we propose a new method to verify the criteria of the surf-riding/broaching mode of small ships. In case, L1 vulnerability criteria is not satisfied based on the relatively simple calculation using the Froude number, we presented the calculation code for the L2 criteria considering the hydrodynamics in waves to perform the more complicated calculation. Then the vulnerability criteria were reviewed based on the data for a given ship. The value of C, which is the probability of the vulnerability criteria for surf-riding/broaching, was calculated. The criteria value C is considered in new approach method using the Froude-Krylov force and the diffraction force. The result shows lower values when considering both the Froude-rylov force and the diffraction force than with only the Froude-Krylov force was considered. This difference means that when dynamic roll motion of ship, more exact wave force needs considered for second generation intact stability criteria This result will contribute to basic ship design process according to the IMO Second-Generation Intact Stability Criteria.