• KDI Journal of Economic Policy
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• v.19 no.2
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• pp.213-268
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• 1997

일국(一國)의 경제발전(經濟發展)은 경제적 진보와 근대화를 수반하는 역사적 현상이지만 구체적으로는 산업구조(産業構造)의 변화(變化)에 의한 생산(生産)과 소득(所得)의 증가(增加)라는 측면을 가지고 있다. 한국과 일본의 경제발전과정에 수반되는 경제성장과 산업구조변화에 대한 요인을 비교 분석하는 것은 양국경제의 발전현상을 이해하고, 향후의 경제정책에 기초적인 정보를 제공할 수 있다는 점에서 그 중요성이 있을 것이다. 따라서 본고는 "비례적(比例的) 성장(成長)으로부터의 편차(偏差)(DPG)" 방법을 일본의 경우는 1915~90년, 한국은 1960~90년까지의 장기적인 산업연관자료에 적용하여 양국의 산업성장과 산업생산구조변화에 대한 요인을 수요측면에서 비교 분석하였는바, 그 결과는 다음과 같이 요약된다. 우선 양국경제의 산업생산구조 및 주도산업의 변화는 시기에 있어서 차이를 보이지만 분석기간중 양국 모두에서 농림수산업은 계속해서 생산비중이 줄어들고 있고, 경제성장을 주도한 산업이 경공업에서 중화학공업으로, 그리고 중화학공업에서도 중공업으로 이전된 것으로 나타났다. 일본의 경우는 1970년대에는 생산자서비스부문을 중심으로, 그리고 1980년대에는 소비자서비스부문을 중심으로 "경제의 서비스화"가 진전되어 서비스산업이 주도산업으로 부상되고 있으나, 한국경제에서는 1990년까지도 서비스산업의 확대가 관측되지 않고 있다. 이러한 결과는 향후 한국경제의 산업생산구조에 있어서 서비스산업의 중요성이 점차 커질 것이며, 특히 "경제의 서비스화"가 생산자서비스부문을 중심으로 이루어질 가능성이 높다는 것을 시사한다. 한편 양국의 성장패턴을 살펴보면, 일본의 경우는 시기별로 성장요인에 많은 변화가 있었으나 대체로 수출보다는 국내수요(國內需要)가 경제성장에 중요한 역할을 한 것으로 나타났다. 그러나 한국경제의 성장의 성장에는 수출과 투자의 역할이 중요했으며, 특히 수출은 분석기간중 지속적으로 정(正)의 효과(效果)만을 보여 경제성장의 견인차역할을 한 것으로 나타났다. 1980년대까지 한국경제의 성장에 있어서는 수입대체보다는 수출확대를 통한 중화학공업의 육성이 지대한 영향을 미쳤으며, 이러한 수출주도적인 중화학공업의 성장패턴은 현재 국내수요(國內需要)의 규모(規模)와 산업구조변화를 일본의 경우에 비추어볼 때, 향후 몇 년 동안은 크게 변화하지 않을 것으로 판단된다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.25 no.4
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• pp.482-488
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• 2019

Leisure and business facilities have been steadily developing in Korea. Among waterborne leisure vessels and equipment, the distribution and sale of kayaks and canoes have significantly increased. Previously, (FRP) materials were primarily employed for constructing kayaks. However, owing to global warming and depletion of natural resources, the demand for non-polluting renewable energy is rapidly increasing, which has increased the demand for carbon fibers. To meet the requirements of changing social consciousness, a carbon fiber-based commercial kayak was designed in this study. Resistance analysis and structural safety were conducted by employing software tool for verifying the reliability of the proposed kayak. The pressure resistance and frictional resistance were examined in a wide range of speed. Obtained results indicate that at speeds greater than 2.6 m/s, the pressure resistance significantly increases and the total resistance also increases. Furthermore, the results corroborate that the proposed kayak structure has a adequate safety with respect to the design loads that are considered during operating conditions.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.823-824
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• 2016

In general, distribution board, panel board and motor control center can be installed over a wide area such as residence of group, building, schools, factories, ports, airports, water service and sewerage, substation and heavy industries that are used to supply converts the voltages extra high voltage into optimal voltage. There are electrical accidents due to rise of contact temperature, loose contact of bus bar, deterioration of the contact resistance, overtemperatue of the bus bars. In this paper, we propose bus bar joints monitoring system with loose connection of bus bar, measuring the joint resistance of busbars and monitoring internal and external heat. The proposed system can be reduced the electrical accidents by maintenance of busbar joints and the temperature of the conductive contact surface of busbars.

• The Korean Journal of Air & Space Law and Policy
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• v.35 no.1
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• pp.153-180
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• 2020

This study is meaningful in finding out what legal and policy issues need to be improved in order to foster the aircraft industry, which is relatively underdeveloped compared to the fact that some heavy industries, such as the automobile industry and shipbuilding industry, have achieved a high level of production and technology globally. Korea's aircraft industry has been growing at a slower pace than other industries, largely due to the country's economic growth and the lack of a market structure to properly use variables such as the level of development in related industries, aircraft technology and demand for aircraft manufacturing. While most industries are privately led by the market structure of the competition system, heavy industries such as the aircraft industry generally grow under the market structure of the incomplete competition system, because only by securing huge initial investment costs, high technology, and sufficient demand, they can maintain minimum economic feasibility. The Korean aircraft industry was focused on developing and mass-producing military aircraft focusing on military demand, but it sought to turn the tide by signing the BASA (Bileral Aviation Safety Agreement) with the U.S. A preliminary feasibility study was conducted in 2010 to develop next-generation medium-sized aircraft, but was cancelled due to differences in position with Canada's Bombardier, which is subject to the concourse, and Korea Aerospace Industries (KAI) is pushing for the production of Bombardier's Q400 license on its own. Compared to the mid-to-large sized civil aircraft that are facing difficulties in development, KAI and KARI are successfully developing technologies to unmanned aerial vehicles and civil helicopters. In addition, the unmanned aerial vehicle sector is not yet suitable for manufacturers that have an exclusive global influence, so we believe that it is necessary to pursue government-led research and development projects with a focus on the areas of commercial helicopters and unmanned aerial vehicles in order to foster the aircraft industry in the future. In addition, since military aircraft such as KT-1 and T-50 are currently being exported smoothly, and it cannot be overlooked that the biggest demand for aircraft manufacturing in the Korea is the military, it is necessary to push forward national R&D projects and defense R&D program simultaneously to enable both civilian-military development. However, there are many differences between the two projects in the way they are implemented, the department in charge and the royalty system. Through this study, we learned about the technology ownership and implementation rights of national R&D projects and defense R&D programs, as well as the royalty system. In addition, problems with the system were identified and improvement measures were derived.

• KEPCO Journal on Electric Power and Energy
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• v.2 no.4
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• pp.531-536
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• 2016

The worldwide research and development for high-efficiency power generation system is progressing steadily because of the growing demand for reducing greenhouse gas emissions. Many countries have spurred the research and development of supercritical $CO_2$ power generation technology since 2000 because it has the advantage of compactness, efficiency, and diversity. Supercritical $CO_2$ power generation system can be classified into an indirect heating type and a direct heating type. As of now, most studies have concentrated on the development of indirect type supercritical $CO_2$ power generation system. In the United States, NREL(National Renewable Energy Lab.) is developing supercritical $CO_2$ power generation system for Concentrating Solar Power. In addition, U.S. DOE(Department of Energy) also plans to start investing in the development of the supercritical $CO_2$ power generation system for coal-fired thermal power plant this year. GE is developing not only 10MW supercritical $CO_2$ power generation turbomachinery but also the conceptual design of 50MW and 450MW supercritical $CO_2$ power generation turbomachinery. In Korea, the Korean Atomic Energy Research Institute has constructed the supercritical $CO_2$ power generation test facility. Moreover, KEPRI(Korea Electric Power Research Institute) is developing a 2MW-class supercritical $CO_2$ power generation system using diesel and gas engine waste heat with Hyundai Heavy Industries.

• Korean Security Journal
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• no.13
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• pp.507-528
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• 2007

June 2006, five korean oil workers, three who worked for Daewoo and two for Korea Gas, released after being held hostage by separatist militants in Nigeria. The kidnapping was happened in the Niger Delta where armed separatists are demanding a larger share in oil revenues and compensation for environmental destruction due to oil exploration. Seven months later, nine Korean pipeline workers of Daewoo together with a Nigerian were kidnapped again and safely released thanks to the efforts of the company and the Korean government. These two kidnapping incidents have shown that companies engaged in the overseas business are not safe any more from the terrorist attacks and has given an invaluable lesson that the company having an intention to go abroad for business should take all possible anti and counter-measures against terrorism. The main purpose of this study is to suggest a guideline for the establishment of counter-terrorism and security strategy against terrorist attacks on the private companies at the overseas. In order to foster a better understanding of the problem, a brief history of terrorism is presented in the first part. In addition, this study analyses and describes the variations of terrorist attacks against private companies together with the terrorism related environment of Korea. Based on the outcome of the study, this paper takes a global view and perspectives of terrorist attacks against private companies and suggests consideration for the future.

• Journal of the Korean Society of Marine Environment & Safety
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• v.25 no.2
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• pp.237-243
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• 2019

Floating platforms made of PE (PolyEthylene) are often located in shallows of seas, rivers or lakes. They are widely used for marine pensions, marine pontoons, marine bridges, etc. These products are characterized by good flexibility, recyclability, chemical resistance and weatherability with corrosion resistance. Existing PE floating platforms have a simple structure in which one pipe is fastened to one bracket, but this has limited application, even if a user modifies the arrangement. Therefore, we developed a structure that allows buoyancy pipes of various sizes to be fastened to one bracket and verified the structural safety of the product using the finite element method. From the results of structural analysis for buoyancy pipes of different diameters, the maximum stress ratio was 0.78 compared with allowable criteria of 1.0, which represented sufficient safety for a model with 500 mm diameter pipes. Based on the results of this study, further research to evaluate the structural safety of various floating platforms can be carried out in the further; it will also be necessary to establish related evaluation criteria.

• Journal of the Korean Society of Marine Environment & Safety
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• v.29 no.2
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• pp.230-237
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• 2023

Due to the COVID-19 pandemic and climate change, shortages of essential commodities and resources continue to occur globally. To address this problem, trade volume demand suddenly increased, driving up the freight rate of container ships sharply. The size of container vessels progressively increased from 1,500 TEU (twenty-foot equivalent unit) in the 1960s to 24,400 TEU in 2021. As the improvement of container loading capacity is closely related to the enlargement of the lashing bridge structure, it is necessary to design a structure effective for good container securing and safe under the various external loads that occur during voyage. Major classification societies have recently issued structural-analysis-based guidelines to evaluate the structural safety of lashing bridges, but their acceptance criteria and evaluation methods are different, causing confusion among engineers during design. In this study, the strength change characteristics are summarized by variations in the main variables (modeling range, opening consideration, mesh size) likely to affect the results. Based on this result, the authors propose a reasonable structural-analysis-based evaluation that is expected to serve as a reference in the next revision of classification standards.

• Journal of the Korean Society of Marine Environment & Safety
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• v.29 no.7
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• pp.950-957
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• 2023

For safe mooring and towing between the ship and port, the equipment must be designed in accordance with the relevant international regulations. However, some small shipyards and engineering companies often do not fully comprehend the core contents. Therefore, the international regulations regarding towing and mooring equipment are reviewed and the bollard and chock are newly developed based on the Mooring Equipment Guideline 4 (MEG4) standards. A bollard is a mooring equipment used to fix a mooring rope to the hull. It has two columns and is mostly used in a figure eight pattern knots under the mooring condition. The chock, which is used to change the mooring rope direction coming into the ship from outside, is manufactured using a casting with curvature. The two mooring equipment are widely used in the stern, bow, and mid-side. Owing to the increase in the size of container vessels and LNG ships, the mooring rope load has increased and the safe working load of the mooring equipment must be revised. This study summarizes and examines the results of the allowable stress method obtained using finite element analysis modelling. To consider the mesh size effect, a reasonable criteria was suggested by referring the existing class guidance. Additionally, the safe working load was verified through nonlinear collapse analysis, and the elastic region against load increments was confirmed. Furthermore, the proposed evaluation method can be used to develop similar equipment in the near future.