• Strategy21
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• 통권40호
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• pp.144-161
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• 2016

A unanimous Award has been issued on 12 July 2016 by the Arbitral Tribunal constituted under Annex VII to the United Nations Convention on the Law of the Sea in the arbitration instituted by the Republic of the Philippines against the People's Republic of China. The current security issues in the regional sea shall be carefully reflected to anticipate whether the Award could resolve the existing political conflict or rather will grow military tension in the region. The Award clearly directs the scope of delimiting maritime jurisdiction to coastal States in the Southern China sea, so it seems to help facilitating finding resolutions of regional disputes on maritime boundaries. On the other hand, there are several limitations in reality to implementation of the decisions included in the Award. USA could use the decisions to restrict military activities and exercise of unilateral maritime jurisdiction by China in the region, while China shall encounter guilt to illegitimacy of its activities as well as shaking the legal foundation of its policy in the region. Then the resolution of this dispute through application of international law would rather cause more political confusion. The intension of bringing the case to an international court were to resolve political difficulties. If, however, the political difficulties are not properly reflected in the legal decisions, such decision would possibly raise more political risks.

• 한국문헌정보학회지
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• 제27권
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• pp.229-263
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• 1994

The main objective of this article lies in discussing dependecy issues as related to information development in NICs. The theoretical foundation was drawn from theories of 'dependency' and of 'information societies,' The main assertion of the dependency school (the more dependency, the less development) was applied for a test of the relationship between dependency on foreign scientific and technical information (STI) resources and indigenous STI development in NICs. Utilizing a case study method, this study explored the causes and results of dependency on foreign STI in a leading NIC­the Republic of Korea (ROK). First identified were the economic factors that might have influenced the ROK's dependency on foreign STI. Also investigated were the social factors that might have had associations with the R&D personnel's dependency on foreign STI. Regarding the development of information area, this study discussed general features in the process of producing, organizng, and gatekeeping indigenous STIIdentified regarding the ROK's information dependency was the R&D personnel's pattern of using foreign STI resources as well as the country's dependency on foreign STI resources. This study also discussed the socio-economic progress toward an information society in ROK for the past decades. Finally, specific linkages between the selected five variables were examined on the basis of the proposed four hypotheses.

• 한국기계가공학회지
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• 제20권10호
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• pp.1-8
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• 2021

Cylinder liners used in diesel engines of combat equipment are prone to cavitation due to wet cooling. The damage caused by erosion and corrosion due to cavitation has a fatal effect on the performance and lifespan of a diesel engine. Therefore, a study was conducted to improve the durability of cylinder liners. Two surface treatment techniques were proposed: nitriding and chrome plating. It was observed that the amount of erosion on the surface of nitride-treated cylinder liners was high because the surface-treated part eroded due to its weak impact resistance against the bubble explosion generated by cavitation. In contrast, the chrome-plated cylinder liner had a lower amount of erosion among the specimens subjected to the accelerated test. These results verified that the resistance of chrome-plated liners against cavitation is high. Therefore, it can withstand the impact of bubble explosion. If the chrome plating thickness is set with reference to the KS standard, an exceptional durability of abrasion, wear resistance, and corrosion resistance can be obtained. If the thickness is set between 120~250㎛, it is expected that the durability of the cylinder liner can be improved. Although a recovery method for corroded cylinder liners is suggested, the proposed method has an inherent risk of crack generation. Therefore, further research is required to solve this problem.

• 환경생물
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• 제40권4호
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• pp.442-454
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• 2022

A total of 31 bacterial strains were isolated from the Geum River basin in the Republic of Korea during our investigation of indigenous prokaryotic species. The isolated bacterial strains had high 16S rRNA gene sequence similarity (>98.7%) with those of validly published bacterial species, which have not been reported in Republic of Korea. The 31 bacterial strains were phylogenetically diverse and assigned to 4 phyla, 8 classes, 18 orders, 21 families, and 27 genera. At the genus level, the unreported species were affiliated with Kineococcus, Pedococcus, Rhodoluna, Salinibacterium, Rhodoluna, Arthrobacter, Williamsia, Nakamurella, Nocardioides of the class Actinobacteria, Patulibacter of the class Thermoleophilia, Pontibacter, Hymenobacter of the class Cytophagia, Flavobacterium of the class Flavobacteriia, Geomicrobium of the class Bacilli, Brevundimonas, Gellertiella, Rhizobium, Paracoccus, Taonella, Sphingomonas of the class Alphaproteobacteria, Burkholderia, Polaromonas, Hydrogenophaga, Chitinilyticum, Azospira, Zoogloea of the class Betaproteobacteria, and Pseudomonas of the class Gammaproteobacteria. The unreported bacterial species were further characterized by examining their morphological, cultural, physiological, and biochemical properties. The detailed descriptions of the 31 bacterial strains were provided.

• 시스템엔지니어링학술지
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• 제18권2호
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• pp.117-125
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• 2022

In the early 2000s, the rapid decline in the fertility rate resulted in a decrease in military resources to maintain the conscription system. In addition, there has been a further decline in the fertility rate in recent years. So, it is necessary to efficiently utilize military resources to prepare for future problems. The Republic of Korea Navy is planning to reduce the number of crew to operate the newly built warships to prepare for this trend of decreasing in troop resources. However, if the number of crew is reduced without reviewing the appropriate number of crew for the operation of the warship, a bigger problem may be encountered in the future. In order to solve this problem, research is being conducted to examine whether the number of crew aboard a warship is appropriate using simulation. However, it is difficult to create a crew simulation model due to the lack of detailed data related to crew operation. In this study, to solve this problem, a method of generating quantitative data using qualitative survey results was suggested, and the process of creating a crew simulation model was performed using this.

• ALGAE
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• 제37권4호
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• pp.265-279
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• 2022

The primary production (PP) by phytoplankton in marine ecosystems is essential for carbon cycling and fueling food webs. Hence, estimating the PP in the territorial sea of each country is a necessary step to achieving carbon neutrality. To estimate the PP in the territorial sea of the Republic of Korea from 2005 to 2021, we analyzed various physiochemical parameters, such as sea surface temperature (SST), Secchi depth, and concentrations of chlorophyll-a and nutrients in the seas of five regions, including the East Sea, West Sea, western South Sea, eastern South Sea, and the waters off Jeju Island. During the 17-year study period, the SST tended to increase, while the nutrient concentrations declined, except in the Jeju area. Overall, the PP did not show a specific temporal trend, but daily PP in the western South Sea was the highest among the five regions. Moreover, the maximum PP in the Korean territorial waters (76,450 km²) was estimated at 11,227 Gg C y^-1, which accounts for 0.03% of the global PP. The results may give insights into a better understanding of the PP, further resource utilization, and environmental sustainability in the studied region.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2008년 영문 학술대회
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• pp.837-841
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• 2008

Propulsion of gene coated micro-particles is desired for non-intrusive drug delivery inside biological tissue. This has been achieved by the development of a device that uses high power laser pulses. The present paper looks at the mechanisms of micro-particle acceleration. Initially, a high power laser pulse is focused onto the front side of a thin aluminium foil leading to its ablation. The ablation front drives a compression wave inside the foil, thus leading to the formation of a shock wave, which will later reflect from the rear side of the foil, due to acoustic impedance mismatch. The reflected wave will induce an opposite motion of the foil, characterized by a very high speed, of the order of several millimeters per microsecond. Micro-particles, which are deposited on the rear side of the foil, thus get accelerated and ejected as micro-projectiles and are able to penetrate several hundreds of micrometers inside tissue-like material. These processes have been observed experimentally by using high-speed shadowgraphy and considered analytically.

• 벤처창업연구
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• 제11권6호
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• pp.175-183
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• 2016

정부는 '국민행복, 희망의 새 시대'라는 국정비전하에 '일자리 중심의 창조경제' 실현을 제1의 국정목표로 설정하며 청년실업문제해소와 국가차원의 새로운 성장 동력 확보를 창업을 통해 이루어 내려고 수많은 창업지원사업을 하고 있다. 2015년 9월 8일 발표한 정부의 '2016년도 예산안'을 보면 새 성장 동력 창출을 위해 크게 벤처 창업 생태계 활성화와 연구개발 (R&D) 성과 제고를 위한 사업들을 2017년에 추진한다. 이러한 창조경제의 방향성에 맞춰 본 연구는 현 창업지원사업이 올바른 방향성 여부를 창업가, 예비창업가, 학생들의 창업생태계에 대한 인식을 중심으로 비교 분석하여 살펴보고자 한다. 그 방법으로 창업가 113명, 예비 창업가 71명, 학생 60명, 창업관련기관 종사자 47명, 투자자 16명, 일반인 50명, 기타 11명 포함 총 368명을 대상으로 온라인 설문조사를 실시하였다. 분석결과, 창업에 대한 사회적 인식은 긍정적이라는 응답이 36.3%로 부정적이라는 응답 32.2%보다 다소 높다는 것을 확인하였다. 창업가에 대한 사회적 인식은 긍정적이라는 응답이 41.7%로 부정적이라는 응답 17.1%보다 2배 이상 높은 응답률을 보였고, 현재의 창업환경에 대한 인식은 나쁘다는 응답이 41.1%로 좋다는 응답 23.5%보다 높은 응답률을 보였다. 향후 대한민국의 창업환경에 대하여는 좋아질 것으로 응답한 비율이 41.2%로 나빠질 것으로 응답한 비율 23%보다 높은 응답률을 보였고, 중국에 비한 우리나라의 창업환경에 대한 인식은 나쁜 편이라고 응답한 비율이 52.9%로 좋은 편이라고 응답한 비율 17.7%보다 약 3배가량 높은 응답률을 보였다. 창업경험유무에 따른 창업가에 대한 사회적 인식은 창업경험 횟수가 증가할수록 부정적임을 확인하였고, 이와 반대로 창업경험 횟수가 증가할수록 현재의 창업환경 및 향후 창업환경에 대한 인식은 긍정적임을 확인하였다. 또한 창업에 대한 부모의 인식이 긍정적으로 변할수록 창업가의 창업의사 또한 긍정적으로 변함을 확인하였고, 경제적인 이유보다 비경제적인 이유의 창업동기로 시작한 창업가의 창업의사가 더 높음을 확인하였다. 본 연구에서는 대한민국 창업생태계의 현황 및 인식을 개괄적으로 분석하여 전체적인 수준을 알 수 있었다. 차후 연구에서는 기존 선행연구에 대한 고찰을 바탕으로 대한민국 창업생태계의 문제점 및 개선방안에 초점을 맞춰서 더 정밀하게 창업생태계를 분석해서 나아가야할 방향성에 대한 제언을 할 필요가 있다.

• 한국수산과학회지
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• 제54권1호
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• pp.64-72
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• 2021

The feeding habits of the Japanese jack mackerel Trachurus japonicus were studied in the Southern Sea of the Republic of Korea. To assess the effects of season, sampling was conducted in February (winter), May (spring), and August (summer), 2020. The total length of each fish was measured in 1 cm intervals. Diet composition showed the highest species diversity during winter. Diet composition changed from copepods to euphausiids as the total length of jack mackerel increased, except during winter. The most important seasonal prey were copepods in winter and summer and euphausiids in spring. Species diversity of the zooplankton community structure was highest in winter. Among the zooplankton communities, copepods were dominant in all seasons. Species with a high electivity index in all seasons were relatively large zooplankton of ≥2 mm. Jack mackerel had ontogenetic diet change, exhibited diet selectivity depending on size, and its feeding habits were affected by the zooplankton community structure.

• 시스템엔지니어링학술지
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• 제16권2호
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• pp.110-117
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• 2020

In this paper, we estimated the straight line stability by performing a 3 degree of freedom spiral test simulation of a intact/damaged surface combatant using the hydrodynamic coefficient obtained through the PMM(Planar motion mechanism) test based on system engineering process. A model ship was ONR Tumblehome and damaged compartment was set on the starboard bow. As a result of conducting a spiral test simulation based on the experimental results of J.Ha (2018), the asymmetric straight line stability due to the damaged compartment was confirmed. In the case of a ship in which the starboard bow was damaged, it was confirmed that it had the characteristic to deflect to the left when going straight. Also, when estimating the straight line stability of a both port and starboard asymmetric surface combatant, a separated equation of motion model that sees the port and starboard as different ships seems suitable.