• Structural Engineering and Mechanics
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• 제65권2호
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• pp.203-211
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• 2018

This paper introduces the development process of NCC(New Concrete Cutting) system and analyzes first verification test. Based on the first verification test results, some problems of NCC system have been newly modified. We carry out the second verification test. We tried to verify cutting performance and dust control efficiency of NCC system through the cutting test of concrete bridge piers. In particular, this verification test strives to solve the problem of concrete dust, which is the biggest problem of dry cutting method. The remaining dust problems in cutting section tried to solve through this verification test. This verification test of the NCC system shows that the dust problem of dry cutting method is closely controlled and solved. In conclusion, the proposed NCC method is superior to the dry cutting method in all aspects, including cutting performance, dust vacuum efficiency and cooling effect. The proposed NCC system is believed to be able to provide eco-friendly cutting technology to various industries, such as the removal of the SOC structures and the dismantling of nuclear plants, which have recently become a hot issue in the field of concrete cutting.

• 한국환경복원기술학회지
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• 제6권5호
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• pp.70-78
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• 2003

From the viewpoint of the importance of the division theory based on topography(pyungsu) derived from the uniqueness in topography, not to mention of the function of ridge in ruban areas, the destroy of ridges should be prevented from the development of hill areas. This study intends to propose the basic concepts and principles to protect the ridge axis with green in open space and landscape planning. The main results are summarized as follows : First, eco-bridge across the ridges will be connected for the purpose of ecosystem restoration. Second, the protection and restoration of green ridge axis can be completed by Green Structure Plan which has principles and standards such as. - layout of development axis and establishment of rules on preservation - the practical use of various preservation methods and the standards suitable to the methods - laying down the standards of restoration according to the height from ground level - the application of zoning such as height district and urban design for preservation Finally, the design of implementation tools must be needed for protection and restoration.

• 한국조경학회지
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• 제27권5호
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• pp.25-37
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• 2000

The purpose of this case study is to provide the basic knowledge and the rationale for establishing the professional personnel position of Landscape Architecture(LA) in local Government of Korea o the basis of the characteristics and adoption system of professional personnel organization in comparison with the cases of Japan, the United States of America, and Germany. I have analyzed the case of Chonju City, Chollabuk-Do, recruited professional personnel of LA by using informal career position, to justify the needs and the division of professional Landscaping works of the city and to figure out drawbacks of the current adoption system of professional personnel in South Korea. In have found the following results that 1) City Mayor in Korean local Governments do not have the proper authorizing rights of recruiting the special personnels for performing urban policy, which is under controls of the Official Appointment Regulations, 2) because of no official position status for specialist in the fields of LA, the Chonju City had been recruited them as Urban Planner status through an informal process, 3) the section of Park and Urban Forestry was established under the control of Department of Culture and multimedia Industry, 4) the fields of specialized works of LA are defined as the work of ecopolis design and planning, biotope networking, ecological bridge and ecological restorations, and 5) the professional positions for LA should be established in Official Appointment Regulation for the urgent needs of local Government sin South Korea.

• KIEAE Journal
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• 제17권5호
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• pp.25-31
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• 2017

Purpose: Currently, there are many success stories coming out various energy-saving / production or eco-friendly buildings. However, these case and method didn't consider of application with existing housing and high-rise housings. In the case of Europe, the North America is gradually grew and settle through the voluntary, small, private development. But this method and system are not fit for the majority of developing countries including South Korea. Method: In this situation, this paper analyse, first arranged previous research and case study, second divided factors and re-organized factors, third analysed plan and elevation of apartment and selected main plan type and elevation type of apartment, finally analysed method of application with existing buildings and high-rise buildings by test and simulation. Result: In sum, this research finally analyzed the change of electricity and fuel consumption according to the change of insulation standard. This study has been expected to serve as a bridge of the energy housing system development and suggest new method applied to the existing housing and building.

• 한국환경생태학회지
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• 제25권5호
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• pp.649-657
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• 2011

본 연구는 고속도로 야생동물 유도울타리 설치효과를 분석하여 적정한 유도울타리 설치 개선 및 관리방안을 제시하고자 중앙고속도로 만종분기점~홍천나들목구간을 대상으로 수행하였다. 고속도로에 설치된 유도울타리는 포유류의 도로침입 방지효과가 있었으며, 방음벽, 낙석방지울타리, 2단 가드레일과 분리방호벽도 로드킬 예방에 효과적인 시설이었다. 유도울타리의 로드킬 저감 효과는 출입문이 설치된 높이 1.5m의 울타리보다 출입문이 설치되지 않은 높이 1.0m 구간이 로드킬 감소효과가 높아 출입문의 유무가 로드킬 저감에 중요한 요인으로 판단되었다. 또한 도로시설물의 연결지점에서 로드킬 저감 효과가 컸으며 출입문이 있더라도 관리가 잘되는 지역도 로드킬 감소효과가 높았다. 유도울타리는 설치연장이 증가함에 따라 로드킬 감소율이 높았다. 유도울타리 끝 부분과 절토부 주변은 로드킬에 취약하여 이에 대한 개선이 요구되었다. 울타리 유지관리용 출입문은 설치간격이 가까울수록 로드킬 발생량이 높아 출입문 관리가 로드킬 저감에 효과가 많은 것으로 판단되었다. 고속도로 유도울타리 설치 개선방안은 암반의 급경사 지역 외에 모두 설치되어야 하고, 도로상의 낙석방지책, 2단 가드레일, 방호벽 등은 적정 시설개선을 통해 유도울타리로 연결 설치되어야 한다. 출입문을 설치할 경우 자동개폐식 또는 중력개폐식으로 설치하여 개방을 방지하고 야생동물 탈출로가 조성이 되어야 한다. 겸용생물이동통로는 토양층 복원이나 식생공간을 조성하여 생물이동통로화 하여야하며 로드킬로 포식자에 의한 2차 로드킬을 막기 위해 사고난 사체는 즉시 도로외부로 처리가 되어야 한다. 울타리는 최소 사고예방 목표지점으로부터 양방향 500m 이상 즉 1,000m 이상 설치되어야 하며 가급적 다음 도로시설인 교량, 통로박스 등까지 연결하여 야생동물을 생물이동통로로 안전하게 유도하여야 한다.

• 환경영향평가
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• 제13권1호
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• pp.21-31
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• 2004

Construction of highway would influence wildlife habitat being fragmented and deteriorated. It is inevitable to observe the death of animals that are killed by vehicles. Nonetheless the cause and status of animal roadkill have not been studied, and this study first attempted to analyze the roadkill in major highway in Korea. We collected 860 individuals of dead animals in Joongang Highway during 1996-2003. Among them Korean hare(Lepus sinensis) was totaled in 165 individuals(19.2%) with the highest figure; Korean racoon dog(Nyctereutes procyonoides) was 146(17.0%); Korean squirrel(Sciurus vulgaris) 56(6.5%); Korean roe deer(Capreolus capreolus) 26(3.0%). Domestic animals was totaled in 232 individuals(27.0%); domestic dog(Canis familiairis) 25, and domestic cat(Catus felis) 207. This study also categorized habitat as mountain-mountain, mountain-plain, mountain-river, plain-plain, plain-river, river-river in each side of the road. Habitat of mountain-plain was the heightest with 296(38.9%) individuals followed by mountain-mountain with 263(34.6%). This indicates that wild animals associated with mountain habitat was most influenced by the construction of roads. This study implied that we should mitigate the roadkill by designing artificial construction such as eco-bridge, fences along the sideway, and boxes under the highway, underdrain structure, etc. The monitoring and cause of habitat fragmentation with GIS approach should be followed to reduce the roadkill.

• Current Research on Agriculture and Life Sciences
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• 제24권
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• pp.37-42
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• 2006

The purpose of this study was a biota research and analysis for Close-to-nature stream restoration planning of Shinchun. The summary of this study is as follows; 1) The vascular plants in research area recorded of 45 species and insect fauna recorded of 34 species of 8 orders. As a result of table of community classification, the communities were two group; Quercus variabilis community(I), Pinus densiflora-Quercus variabilis-Quercus dentata community(II). 2) As a result of analysis on correlation of tree species, the level of significance in positive correlation between Quercus dentata and Corylus heterophyll aindicated 1% and between Pinus densiflora and Lespedeza bicolor also indicated 1%. 3) As a result of DBH analysis, it is expected that Quercus variabilis and Quercus dentata will dominateover other species in competition and its succession continuously maintains from now on in community I. In community II, it is assumed that there is a high possibility of changing into community of Quercus such as Quercus mongolica, Quercus dentata, and Quercus variabilis. 4) As a result of analysis on insect fauna, insect fauna consists of 94% of whole species as 32 species, 23 families, 8 orders. And 7 species, 7 families 4 orders was found in highly urbanized area, the vicinity of Sang-Dong bridge. 5) As mentioned above, Based on A biota fundamental research, Close-to-nature stream restoration planning were full of suggestions: i) Designating ecosystem preservation area, ii) Making Close-to-nature stream revetments, iii) Making pool-and-riffle, vi) Making decks for observation and walks for nature experience, v) Creating wetland biotope. Through these methods, it is necessary to promote bio-diversity and lead people to the space for eco-learning.

• 한국산학기술학회논문지
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• 제15권11호
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• pp.6821-6829
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• 2014

자동차에서 반도체 소자의 사용이 증가하고 있으며 특히 친환경자동차의 구동장치 부품으로서 고내압 스위칭 사용 증가가 예상된다. 그러나 고내압 소자의 경우는 신뢰성 시험을 하기 위한 장비가 국산화 되어 있지 않다. 그러므로 고내압 소자를 시험하기 위한 전원장치의 개발을 위하여 관련 시험규격을 분석하였다. 특히 자동차용 반도체 신뢰성 시험을 위한 AEC(Automotive Electronic Council) Q101에서 시험항목을 분석하여 개발이 필요한 전원장치의 사양을 결정하였다. 주회로는 풀브리지 컨버터로 선정하였으며 주어진 장치 사양에 따라 각종 변수를 설계하였고, 회로 변수의 적절성은 시뮬레이션을 통하여 검증하였다. 또한 전력부의 병렬운전. 패턴 운전을 위한 인터페이스를 설계하였다. 이를 통해 개발된 제품은 시험을 통하여 특성을 검증하였다.

• 대한토목학회논문집
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• 제37권1호
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• pp.143-151
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• 2017

최근 기후변화에 대응하기 위해 새롭게 체결된 파리협정에 따라 우리나라는 2030년까지 기준대비 37%의 탄소배출량 감축목표를 제시하였다. 이를 위해 28개 산업분류에서 3번째로 많은 이산화탄소를 배출하는 건설산업에서 보다 적극적인 연구가 필요하다. 본 연구에서는 기존의 완공된 국도건설사례들 중 터널과 교량을 제외한 도로분야만을 이용하여 전과정평가(LCA)를 실시하여 환경부하량을 산출 하였다. 산출된 환경부 하량을 기반으로 대공종의 대표공종을 선정한 결과 토공, 배수공, 포장공이 전체의 84%를 차지하였으며, 세부공종별 대표공종을 선정하여 각 세부공종별 환경부하량 특성을 분석하였다. 국도건설공사 시 환경부하량 공종별 배출특성을 이용한다면 환경부하량을 기반으로 하는 친환경적인 국도건설공사 의사결정에 도움이 될 것이다.

• 한국주조공학회지
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• 제44권3호
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• pp.70-76
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• 2024

규산나트륨 바인더는 주조산업의 유기바인더를 대체할 수 있는 친환경 무기바인더이지만, 대기 중의 수분에 대한 낮은 안정성을 가지고 있다. 본 연구는 경화된 규산나트륨 바인더가 가진 수분함량이 바인더의 강도와 안정성에 미치는 영향을 확인하기 위해, 경화 조건을 달리하여 중자를 제작하고 굽힘강도를 측정하였다. 규산나트륨 바인더는 130℃ 이상에서 Q³와 Q²의 실리케이트 구조를 가지는 바인더 가교를 안정적으로 형성하는 것을 확인하였다. 중자의 최대 굽힘강도는 경화 조건에 크게 영향을 받지 않는 것으로 확인되었다. 이는 해당 경화 조건에서 바인더 가교를 형성한 실리케이트 구조가 유사하기 때문이다. 반면에 경화된 바인더의 수분 함량이 적을수록 강도안정성은 높아지는 것을 확인할 수 있었다. 따라서 경화된 규산나트륨 바인더의 수분함량은 바인더의 안정성에 영향을 미치는 중요한 인자인 것을 확인하였다.