• 한국산학기술학회논문지
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• 제19권11호
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• pp.213-223
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• 2018

본 연구는 최근 입체도로제도를 활용하여 시가지 정비가 완료된 일본의 신바시 토라노몬 개발 지구의 정비방안에 대해서 분석하였다. 우선 주요관련 법 제도에 있어서는 도로상하에 건축물의 건설을 가능하도록 하는 입체도로제도가 적용 되었으며, 민간 사업자의 자금력과 노하우를 적극 활용한 특정건축자제도를 적용한 것으로 나타났다. 대상 지구에는 도시정비 가이드라인을 책정하고 주택 상점가 재생방침을 정하여 변화감과 통일감 있는 거리형성, 토지의 유효 이용 실현, 매력과 활력이 있는 지속적인 도시정비의 추진을 목포로 재건축시의 지침과 더불어 도시정비에 있어서의 용적률 완화 등의 규제 완화를 두고 있는 것으로 조사되었다. 이밖에 입체도로제도를 활용한 토라노몬 재개발 사업의 정비방안에 있어서는 우선 지상부 도로 계획에 있어서 지역주민의 참여 및 관련 위원회의 의견 수렴을 통하여 접근성 및 녹지확보, 편안하고 세련된 디자인, 지역이 주체가 되며 역사적 건축물 및 도로공간을 활용한 정비 컨셉 등이 주요특징으로 나타났다. 또한 도로 상하부 공사의 경우 입체도로제도의 적용을 통한 건축제한의 완화로 보차분리 및 전주의 지하화 등을 통해 지역주민의 편의성 증진 및 쾌적한 도로경관을 형성하고 있는 것으로 나타났다. 이러한 신바시 토라노몬 시가지 정비에 있어서의 입체도로제도의 적용 및 민간기업과 주민의 참여를 바탕으로 한 정비방안은 국내에 있어서의 도로의 상공 및 지하 공간 개발을 본격화할 기반을 다지며 도로 공간을 활용한 창의적 도시 디자인의 창출을 비롯하여 도시공간의 효율적 활용이 가능해지고, 도로상부와 하부에는 다양한 건축물도 들어설 수 있게 하는 교두보가 될 것으로 여겨진다.

• 한국건설순환자원학회논문집
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• 제1권1호
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• pp.72-80
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• 2005

건설폐기물 발생량이 급증함에 따라, 폐콘크피트를 파쇄가공한 순환골재를 구조체 콘크리트용으로 사용할 필요성이 증대하고 있다. 그러나 순환골재에는 콘크리트의 물리적 특성에 악영향을 미치는 각종 이물질이 포함되어 있어, 사전에 이물질 함유량을 적절히 판단하기 위한 시험방법이 요구된다. 본 연구에서는 순환잔골재와 순환굵은골재에 포함되어 있는 각종 이물질 함유량을 육안관찰에 의하여 선별하기 위한 시험방법을 개발하였으며, 그 결과는 다음과 같다. 1. 현행 KS F 2576(재생골재의 이물질 함유량 시험방법)은 시험대상 순환골재의 종류, 용어의 정의, 시료량, 시험방법 등의 전반적인 개정이 필요하다. 2. 순환골재에 포함된 이물질은 시료의 입경이 1.2mm 이상이면 육안선별이 가능하며, 입경이 클수록 측정 소요시간이 크게 단축된다. 3. 육안선별 방법에 의한 이물질 함유량 시험을 위하여 순환잔골재는 입경 2.5~5mm의 시료 30g, 순환굵은골재는 입경 5mm 이상의 시료 1kg을 대상으로 하면 시험의 용이성 및 정밀도 확보가 가능하다.

• 한국건설순환자원학회논문집
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• 제2권1호
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• pp.136-143
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• 2006

순환잔골재의 고부가가치 활용촉진 및 이를 사용한 콘크리트구조물의 건조수축에 대한 내구성을 확보하기 위한 배합설계자료로 제시하고자 천연잔골재에 대한 고품질 순환잔골재의 대체율별 굳지 않은 콘크리트 성상 및 경화성상 그리고 건조수축특성등을 실험 실증적으로 검증하였다. 그 결과 고품질 순환잔골재를 사용한 콘크리트의 슬럼프, 공기량, 압축강도 및 인장강도는 대체율에 관계없이 유사한 수준을 보였으나, 구속 및 비구속상태에서의 건조수축특성은 큰 차이를 요였다. 구속 및 비구속상태에서 건조수축에 의한 변형량은 고품질 순환잔골재 대제율 30%까지는 천연잔골재만을 사용한 경우에 비해 오히려 건조수축에 대한 저항성이 우수한 것으로 나타났으며, 구조체 콘크리트용 잔골재로 고품질 순환잔골재를 30%까지 대체 사용하는 것이 유효하다는 것을 검증할 수 있었다. 반면, 고품질 순환잔골재 대체율이 50% 이상인 경우에는 천연잔골재만을 사용한 경우에 비해 구속 및 비구상태에서의 건조수축 저항성이 저하되는 것으로 나타났으며, 특히 고품질 순환잔골재 대체율 100%의 경우에는 건조수축에 의한 변형량이 다른 시험체에 비해 급격히 증가되어 구속상태에서 건조수축에 의한 균열발생 시점이 단축되는 것을 확인할 수 있었다.

• 한국공간구조학회논문집
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• 제16권3호
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• pp.99-106
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• 2016

The proposed hybrid damper installs at a coupling beam and consists of a high-damping rubber (HDR) and steel pin. The proposed hybrid damper adopted a pin-lock system acts as a viscoelastic damper under wind load (small displacement) while it behaves as a hysteretic damper under earthquake load (large displacement). In this paper, the pin-lock mechanism and structural performance of the proposed hybrid damper is evaluated through experiment. Experiments were carried out with the variables which displacement, loading frequency and steel pin quantities were used. Test results showed that the pin-lock mechanism and the performance of the hybrid damper under a large displacement were verified. Also equivalent damping ratios of HDR were increasing at a small displacement as displacement amplitudes were increasing. However HDR did not depend on frequency.

• 한국농공학회지
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• 제35권3호
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• pp.63-73
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• 1993

For a systematic approach to rural settlement planning, socio-economic and land use potentialities were analysed in 10 villages("Ri", the lowest-order administrative unit in Korea)of Izuk-myun, Anseong-gun, Kyeonggi province, the model area in this study. Socio-economic potentialities, sub-grouped into rural and urban related ones, were analysed by the principal component analysis technique, while land use potentialities by the land suitability system of which the physical analysis is based on geographical information system. The principal component of rurality is strongly related with 5 key variables such as annual increasing rate of farm households, ratio of over 1ha-households, ratio of full-time farmers, ratio of animal rearing households and the principal component of urbanity with 6 key ones such as population density, number of schools, number of shops and servicing facilities, number of daily bus routes, number of non-farm households, percentage of area of housing sites. The analysis procedure of land suitability using the geographical information system were generalized and the results of analysis on village sites and paddy and upland fields were presented. The whole land use planning was presented by the criteria of the land suitability rank and the priority order of land use. land use.

• Steel and Composite Structures
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• 제20권5호
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• pp.999-1022
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• 2016

The use of Carbon Fiber Reinforced Polymer (CFRP) to strengthen steel structures has attracted the attention of researchers greatly. Previous studies demonstrated bonding of CFRP plates to the steel sections has been a successful method to increase the mechanical properties. However, the main limitation to popular use of steel/CFRP strengthening system is the concern on durability of bonding between steel and CFRP in various environmental conditions. The paper evaluates the performance of I-section steel beams strengthened with pultruded CFRP plate on the bottom flange after exposure to diverse conditions including natural tropical climate, wet/dry cycles, plain water, salt water and acidic solution. Four-point bending tests were performed at specific intervals and the mechanical properties were compared to the control beam. Besides, the ductility of the strengthened beams and distribution of shear stress in adhesive layer were investigated thoroughly. The study found the adhesive layer was the critical part and the performance of the system related directly to its behavior. The highest strength degradation was observed for the beams immersed in salt water around 18% after 8 months exposure. Besides, the ductility of all strengthened beams increased after exposure. A theoretical procedure was employed to model the degradation of epoxy adhesive.

• 농촌계획
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• 제24권1호
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• pp.33-44
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• 2018

This study, targeting Deokbongmaeul, Choonchonmaeul, Hyodongmaeul and Kangsanmaeul, drew the characteristics of history culture resource utilization through the analysis of project plans and performance reports and field surveys. First, Deokbongmaeul is a rural village with scattered Confucian facilities. Ipsanmaeul conforms to Confucian order and has an attractive housing area landscape. Hoechonmaeul has forest landscape and distinguishing intangible recourses like Maeji farmer's music and traditional techniques and legends. Hyodongmaeul shows folk resources and folk behavior like traditional play and techniques. Second, the history culture resources chosen from the project plans focus on intangible history resources like individual historic buildings & structures and customs & traditional techniques. Third, cultural historic village projects are categorized by repair and restoration of historic buildings and structures, development of experience program and building facilities and maintenance and establishing the village landscape elements. From the research results, it is explained that history culture resource utilization methods of cultural historic village project are hard to be expected to have the project results based on the landscape identities of four villages.

• The Journal of Asian Finance, Economics and Business
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• 제7권11호
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• pp.549-556
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• 2020

Real estate markets play an essential role in the economic development of both developed and developing countries. Investment decisions in private real estate demand the consideration of several qualitative and quantitative criteria. Especially in Vietnam, demand for housing, apartments are rising which has resulted because of the migration from rural to urban areas. This study aims to determine the influencing factors of the real estate purchasing behavior and then recommend a grey Multi-Criteria Decision Making (MCDM) support model to evaluate real estate alternatives based on a numerical example in Vietnam. A set of essential criteria are identified based on experts' opinion, and the proposed determinants are initial investment, maintenance cost, prestige location, distance to interesting places, parking lot, public transportation, property condition, total area size, number of rooms, and neighbors. The subjective weights were obtained by using the Decision-Making Trial and Evaluation Laboratory (DEMATEL) model, and the Grey Relational Analysis (GRA) technique is employed to prioritize and rank real estate alternatives. The results reveal that this approach can be useful to make purchasing decisions for many kinds of real estate property under uncertain business environments. These findings indicate that the presented hybrid model has advantages in granting flexibility to the preferences of decision makers.

• Smart Structures and Systems
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• 제22권4호
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• pp.383-397
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• 2018

Traditional base isolation systems focus on isolating the seismic response of a structure in the horizontal direction. However, in regions where the vertical earthquake excitation is significant (such as near-fault region), a traditional base-isolated building exhibits a significant vertical vibration. To eliminate this shortcoming, a rocking-isolated system named Telescopic Column (TC) is proposed in this paper. Detailed rocking and isolation mechanism of the TC system is presented. The seismic performance of the TC is compared with the traditional elastomeric bearing (EB) and friction pendulum (FP) base-isolated systems. A 4-storey reinforced concrete moment-resisting frame (RC-MRF) is selected as the reference superstructure. The seismic response of the reference superstructure in terms of column axial forces, base shears, floor accelerations, inter-storey drift ratios (IDR) and collapse margin ratios (CMRs) are evaluated using OpenSees. The results of the nonlinear dynamic analysis subjected to multi-directional earthquake excitations show that the superstructure equipped with the newly proposed TC is more resilient and exhibits a superior response with higher margin of safety against collapse when compared with the same superstructure with the traditional base-isolation (BI) system.

• Computers and Concrete
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• 제11권4호
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• pp.337-350
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• 2013

The sensitivity of compressive strength of no-slump concrete to its ingredient materials and proportions, necessitate the use of robust models to guarantee both estimation and generalization features. It was known that the problem of compressive strength prediction owes high degree of complexity and uncertainty due to the variable nature of materials, workmanship quality, etc. Moreover, using the chemical and mineral additives, superimposes the problem's complexity. Traditionally this property of concrete is predicted by conventional linear or nonlinear regression models. In general, these models comprise lower accuracy and in most cases they fail to meet the extrapolation accuracy and generalization requirements. Recently, artificial intelligence-based robust systems have been successfully implemented in this area. In this regard, this paper aims to investigate the use of optimized support vector machine (SVM) to predict the compressive strength of no-slump concrete and compare with optimized neural network (ANN). The results showed that after optimization process, both models are applicable for prediction purposes with similar high-qualities of estimation and generalization norms; however, it was indicated that optimization and modeling with SVM is very rapid than ANN models.