• 한국산학기술학회논문지
• /
• 제10권10호
• /
• pp.2907-2916
• /
• 2009

민간투자사업은 1990년대 이후 본격화되어 주요 교통시설을 중심으로 진행되어 왔으며 2005년 이후에는 장기간 서비스를 제공하고 임대료 방식으로 사업자에게 대가를 지급하는 BTL 방식의 사업이 도입되어 학교, 군 주거시설, 하수관거 등 다양한 분야의 시설 및 서비스가 제공되고 있다. 정부 재정사업과 차별화되는 민자사업에 대해서 관련된 위험을 도출하고 그 가치를 평가, 위험 발생을 최소화하려는 제도적 노력은 부진한 편이며 특히 장기간 서비스 계약을 통해 이루어지는 BTL 사업의 경우 위험가치 평가 제도의 도입이 시급한 실정이다. 본 연구는 민자사업 성공의 주요 원인으로 알려진 영국 등의 민자사업 위험가치 평가제도를 비교 분석하고 국내 BTL 사업의 실제 사례에 대해 위험가치를 반영한 PSC(Public Sector Comparator)를 구축, 분석하였다.

• Computers and Concrete
• /
• 제22권1호
• /
• pp.123-132
• /
• 2018

Reinforced concrete (RC) columns which are the main vertical structural members are exposed to several static and dynamic effects such as earthquake and wind. However, impact loading that is sudden impulsive dynamic one is the most effective loading type acting on the RC columns. Impact load is a kind of impulsive dynamic load which is ignored in the design process of RC columns like other structural members. The behavior of reinforced concrete columns under impact loading is an area of research that is still not well understood; however, work in this area continues to be motivated by a broad range of applications. Examples include reinforced concrete structures designed to resist accidental loading scenarios such as falling rock impact; vehicle or ship collisions with buildings, bridges, or offshore facilities; and structures that are used in high-threat or high-hazard applications, such as military fortification structures or nuclear facilities. In this study, free weight falling test setup is developed to investigate the behavior effects on RC columns under impact loading. For this purpose, eight RC column test specimens with 1/3 scale are manufactured. While drop height and mass of the striker are constant, application point of impact loading, stirrup spacing and concrete compression strength are the experimental variables. The time-history of the impact force, the accelerations of two points and the displacement of columns were measured. The crack patterns of RC columns are also observed. In the light of experimental results, low-velocity impact behavior of RC columns were determined and interpreted. Besides, the finite element models of RC columns are generated using ABAQUS software. It is found out that proposed finite element model could be used for evaluation of dynamic responses of RC columns subjected to low-velocity impact load.

• 산업경영시스템학회지
• /
• 제39권1호
• /
• pp.98-104
• /
• 2016

With the development of modern science and technology, weapon systems such as tanks, submarines, combat planes, radar are also dramatically advanced. Among these weapon systems, the ballistic missile, one of the asymmetric forces, could be considered as a very economical means to attack the core facilities of the other country in order to achieve the strategic goals of the country during the war. Because of the current ballistic missile threat from the North Korea, establishing a missile defense (MD) system becomes one of the major national defense issues. This study focused on the optimization of air defense artillery units' deployment for effective ballistic missile defense. To optimize the deployment of the units, firstly this study examined the possibility of defense, according to the presence of orbital coordinates of ballistic missiles in the limited defense range of air defense artillery units. This constraint on the defense range is originated from the characteristics of anti-ballistic missiles (ABMs) such as PATRIOT. Secondly, this study proposed the optimized mathematical model considering the total covering problem of binary integer programming, as an optimal deployment of air defense artillery units for defending every core defense facility with the least number of such units. Finally, numerical experiments were conducted to show how the suggested approach works. Assuming the current state of the Korean peninsula, the study arbitrarily set ballistic missile bases of the North Korea and core defense facilities of the South Korea. Under these conditions, numerical experiments were executed by utilizing MATLAB R2010a of the MathWorks, Inc.

• 한국건축시공학회지
• /
• 제17권1호
• /
• pp.1-8
• /
• 2017

최근 전 세계적으로 폭탄테러 및 폭발사고가 빈발하여, 인명 및 재산피해가 증가하고 있다. 따라서 방호 방폭 성능을 갖는 고성능 시멘트 복합재료(HPFRCC)에 대한 관심이 증가하고 있다. 이에 본 연구에서는 최적의 HPFRCC를 군부대 시설에 실제적으로 적용하기에 앞서 유 무기 복합섬유 혼입율 및 ERCO 혼입율 변화에 따른 HPFRCC의 기초적 특성 및 자기수축 저감 성능을 분석하고자 하였다. 그 결과, 적절한 유동성, 강도, 자기수축저감 효과를 종합적으로 고려할 때 복합섬유(SS+OL) 혼입율 1.5%에 ERCO 0.5%의 혼입이 가장 효과적인 것으로 평가 되었다.

• 한국환경복원기술학회지
• /
• 제17권1호
• /
• pp.185-201
• /
• 2014

The Yong-neup of Mt. Daeam, which was designated as Korea's National Monument No.246 in 1973, is a high moor, and it has been managed with the designation as an ecosystem conservation area, Ramsar wetlands, and wetland conservation area. With the closing of the officially announced 5-year period for 'No-Trespassing' on the ecosystem conservation area starting August, 2010, it becomes necessary to arrange a systematic management and conservation scheme in consideration of the access & use of the visitors and Yong-neup's potential change into land consequent on making it open to the public. This study thinks that in order to preserve the Yong-neup, it's necessary to prepare the conservation plan for the program operation for exterminating exotic species, development of replacement wetlands and nurseries, access limit through zone categorization, establishment of environment-monitoring system, institutional management support, and establishment of managing facilities, etc., and to make scientific approaches, such as survey on wetland ecosystem, establishment of inventories, wetland monitoring, and drawing up of wetland ecology maps, etc. In addition, it is required that there should be adequate considerations of restoration of slope faces, drains, artificial embankment, water-collecting wells, roads for military operations, and wild-boar-stricken areas, etc., and should be continuous and systematic management of Yong-neup through the wise use of residents' participation-style maintenance, organization of a consultative body, introduction of CEPA programs, and introduction of visiting facilities and alternative transportation system, etc.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제25권4호
• /
• pp.1-6
• /
• 2020

Recently, ex-situ remediation technologies has been emerging to clean up contaminated soils mainly because the in-situ techniques have limited applicability and technical difficulties in relatively small contaminated sites. Accordingly, implementation of off-site treatment and disposal have been continuously increased in soil remediation and restoration projects in Korea. However, in many cases, reclaimed soil is still not properly recycled or reused. Therefore, there is an urgent need to document the current status of soil management practices in soil remediation projects in the nation. This study presents a survey of soil contamination status and remedial approaches in Korea based on soil cleanup projects completed in 2015 - 2019, and proposes the possible options of the recycling or reusing the reclaimed soils under compliance with related regulations. The results of the soil survey showed soil contamination was most severe in gas stations, industrial facilities, and military areas. The major types of pollution were related to the petroleum-contaminated site (TPH and BTEX) with 77.0% occurrence in all the contaminated sites. The reclaimed soils were mostly reused as a ground filling-up soils in industrial facilities (60.0%) and warehouses (37.0%).

• International Journal of Computer Science & Network Security
• /
• 제22권10호
• /
• pp.145-154
• /
• 2022

Based on the obtained results of the study, the most problematic issues and legal conflicts are identified, which are related to the ratio of norms of domestic and foreign legislation, taking into account the requirements of the Constitution of Ukraine and the provisions of the Law of Ukraine "On international agreements". Along with this, it is stated in this scientific article that there are a number of provisions and examples of positive practice on the specified topic abroad and in international legal acts today, which should be used by Ukraine both in improving legislation on the issues of banking activity and in increasing the level of criminal legal protection of relevant critical infrastructure facilities, especially those that are substantively related to prevention and counteraction of activity, with regard to the legalization (laundering) of criminally obtained funds, financing of terrorism and the financing of the proliferation of weapons of mass destruction, which is quite relevant for our state, given the military conflict that is taking place on its territory in the Donbass. Again, in the same context, the need for more active cooperation between Ukraine and the FATF (international body developing a policy to combat money laundering) has been proven.

• 한국농촌건축학회논문집
• /
• 제24권4호
• /
• pp.117-124
• /
• 2022

Recognizing the problem that the definition of the term pan-ock does not appear precisely in the dictionary, the definition of pan-ock was established through analysis by analyzing 183 cases of pan-ock searched in the Korean Classics DB and classifying them into buildings and ships. First of all, the 65 pan-ocks classified as architecture were used in various ways, such as residences, religious facilities, jang-pan-ocks, and prisons, depending on their use. Second, the 90 cases of pan-ock related to ships were the concept of houses that combine work and accommodation on ships. Finally, through military installations, literary expressions, and bureaucrats who have seen trains and wagons, Pan-ock uses boards. It can be used for walls or roofs only, or for both walls and roofs. Therefore, it is necessary to consider the case of the Joseon Dynasty with the definition of Pan-ock in the existing dictionary. In other words, Pan-ock refers to "houses, religious facilities, royal tombs, and prisons, with various uses and forms. In addition, it refers to the joining of only the wall or the roof with planks, or the joining of both the wall and the roof," suggesting a broader interpretation of the category.

• 융합보안논문지
• /
• 제12권1호
• /
• pp.97-107
• /
• 2012

올해 말로 파병기간이 마무리되는 우리나라는 3월 핵안보정상회담, 5월 EXPO개막 및 총선, 대선의 선거철을 맞이하게 된다. 따라서 탈레반의 테러를 통한 철군여론조성전략에 우리나라가 선택될 가능성이 높다. 이는 탈레반 테러홍보전략과 부합하며 과거 사례에 따른 학습효과이다. 이에 따른 탈레반 테러위협의 가능성을 요약한다면 위협의 시기는 우리나라에서 핵안보정상회담과 EXPO가 개막되는 상반기에 집중 고조될 것이며, 대상과 방법은 국내 정부기관이나 미국시설물 등에 대한 자살폭탄, 폭탄적재차량의 추돌 테러 가능성과 국외 관광객, 선교사 등 우리 국민에 대한 납치행위가 자행될 가능성이 높다. 범행에 가담할 테러 조직으로는 국내에 이미 거점을 확보한 이슬람 불법체류자들 이용하거나 알카에다와 연결된 전문 테러리스트의 입국 공작이 우려된다. 이러한 테러의 명분은 아프가니스탄 주둔 우리군 및 서방 동맹군의 철수일 것이다. 따라서 올 전반기 세계핵안보정상회담, 여수EXPO 등 국제행사의 안전대책과 해외 체류 내국인에 대한 탈레반의 홍보성 테러에 철저하게 대비하여야 하며, 국내 불법체류외국인의 동향 파악과 탈레반 관련 국제테러리스트의 국내 잠입의 차단책을 강구하여야 한다. 또한 아프가니스탄 주둔 우리 군에 대한 정부의 정책적 의지를 조기 표명할 필요가 있다.

• 한국건축시공학회지
• /
• 제20권3호
• /
• pp.253-260
• /
• 2020

지하형 탄약고에 대한 관심이 증가하면서, 관련된 설계 결과가 다수 도출되고 있다. 그러나 터널 민간 전문가들뿐만 아니라 탄약관련 군 실무자들도 안전거리 기준을 완벽하게 숙지하지 못하여 안전거리 기준을 모두 준수한 신뢰성 있는 설계 결과는 도출되고 있지 않고 있는 실정이다. 또한 안전거리를 과하게 적용하여 부지를 비효율적으로 활용하거나 시공불가판정을 받는 사례도 보고되고 있다. 본 연구에서는 지하형 탄약고에 대한 안전거리 기준을 정리하고 이를 준수하면서 효율적으로 설계할 수 있는 방안에 대해 연구하였다. 또한 여러 방법 중 안전거리를 획기적으로 저감시킬 수 있는 방법을 도출하여 향후 지하형 탄약고 설계 및 시공 시에 적용할 수 있도록 데이터를 마련하였다.