• Architectural research
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• 제15권1호
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• pp.25-33
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• 2013

The amount of construction waste increased to 176,447 ton/day in 2008 from 28,400 ton/day in 2000, a 6-fold increase in just 10 years. Such dramatic increase in the waste of concrete, asphalt concrete, wood and metals was due to demolition of old buildings as well as a great number of building redevelopment projects and hurried city industrialization. Many buildings targeted for demolition today were built in line with the government policy to provide affordable housing to citizens in the shortest time possible and consequently, said buildings underwent rapid deterioration and required periodic repairs and reconstruction. Based on the above, we predict that construction waste will continue to increase for the foreseeable future. In particular, due to limited availability of suitable space to construct apartments and residential buildings in the city, old buildings are being torn down to make space for new development, further increasing construction waste. In light of that, efforts to recycle as well as reduce generated waste are urgently required.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 춘계 학술발표회
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• pp.1206-1211
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• 2010

Soil-cement, a hardened mixture of Portland cement, soil, and water that contain sufficient durability, has been widely utilised in Seoul urban construction sites to retain lateral earth pressures or reinforce grounds. However, little information has been reported about the strength characteristics of soil-cement constructed in Seoul urban area. In this study, we performed a number of unconfined test to the soil-cements mixed from soils sampled in 3 sites in Seoul urban area. Results indicate that unconfined strengths and optimum cement amounts of soil-cements are highly dependent on the proportion of coarse-grain particles of mixed soils. Furthermore, changes of unconfined strengths with curing time are diverse with respect to mixing conditions.

• Wind and Structures
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• 제2권2호
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• pp.127-131
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• 1999

This paper describes probabilistic characteristics of damping in a tall building based on the results of full-scale measurement. It is found, through statistical analysis of the damping data, that the probability density function(PDF) of damping at the high amplitude plateau can be well represented by Normal distribution (Gaussian distribution). A stochastic damping model is proposed to estimate amplitude-dependent damping for practical application.

• 한국어학
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• 제74권
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• pp.1-24
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• 2017

This paper investigated -eullanjira sentence as a kind of construction of the Southwestern dialect in Korea. Five informants were selected to form the main corpus of -eullanjira. Through analyzing the corpus, its semantic, syntactic and morphological characteristics were figured out. Firstly, a view of construction grammar was adopted to capture the semantic and syntactic characteristics of -eullanjira. The construction of -eullanjira was established as "Xdo Yeullanjira Z". Syntactically, -do was found to be a common auxiliary particle, which allowed nouns, adverbs, verbs and adjectives to appear at the position of X, while only verbs and adjectives could appear at the position of Y. Subject-honorific, causative and passive prefinal endings could coexist with Y, while tense and modal prefinal endings could not. Z was an embedded clause, which had the semantic feature of [-DOUBT], meaning 'it should be done undoubtedly'. The formation of -eullanjira was next examined both diachronically and synchronically. It was found there was a conjuntive ending of Middle Korean, corresponding -eullanjira, namely, -landai. Finally, -eullanjira was newly analyzed as [[-eulla-]+[-n-ji-ra]].

• 드라이브 ㆍ 컨트롤
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• 제15권2호
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• pp.46-51
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• 2018

Many research studies have been carried out related to saving energy and environmental pollution in the field of construction machinery. The best solution for reducing the related environmental pollution is to reduce fuel consumption by upgrading the energy efficiency of machinery used in this field. An efficiency upgrade in the field of construction machinery would mean minimizing the pressure loss in hydraulic pipe lines or achieving optimal operating conditions while responding to a load. One way to achieve this is to make an equivalent circuit, like an electrohydrostatic actuator, or to improve the spool type valve using the 4/3 way method. This study deals with an electrohydraulic proportional flow control valve. SimulationX software is used as a simulation tool for analyzing the dynamic characteristics. The analysis results, including the performance and characteristics of design parameters, are discussed and the validity of the theoretical analysis is also evaluated.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.1241-1241
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• 2022

In the current construction industry, difficulty arises in creating an adequate baseline schedule to establish a fundamental plan for construction. This presentation will present the research findings which investigated industry-recognized schedule metrics that aid in the successful implementation of said schedule. Industry organizations (Association for the Advancement of Cost Engineering, the Government Accountability Office, the Project Management Institute, and local city, state, and county government offices) provide standardized guidelines with specific metrics requirements to ensure successful implementation. However, most of those metrics are substantiated or validated in their effectiveness. The study examined the impact between these industry-recognized critical metrics and three distinct scheduling characteristics: Project Type, Project Duration, and Project Density (number of activities within a schedule). The research results showed that, among the 12 various schedules evaluated in parallel with 20 industry-recognized critical metrics, seven metrics substantially demonstrate a significant impact on a project schedule's success. Furthermore, six of the seven metrics directly correlate to at least one of the three scheduling characteristics outlined. As a result, this research has established more predictable outcomes based on impacts between three distinct project characteristics and 20 of the most discussed/researched critical scheduling metrics in the field. This allows management teams to have more confidence in establishing critical milestones and accurate turnover dates from the start of the project through its final completion.

• 대한토목학회논문집
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• 제26권4D호
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• pp.661-670
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• 2006

건설 공정계획을 수립함에 있어 시뮬레이션의 제한적인 활용은 시뮬레이션 관련 데이터의 수집과 모델 구축의 어려움에 그 원인을 두고 있다. 본 연구에서는 시뮬레이션 관련 데이터 수집과 분석을 통하여 건설 장비 운영 특성 데이터 축적과 데이터 분포 특성 분석 방법론을 제시하였다. 실제 현장에서 측정한 건설 장비 운영 데이터를 확률 통계적 기법을 적용하여 데이터의 분포 특성을 분석하였으며, 이러한 데이터 축적 및 데이터베이스(DB)화는 시뮬레이션 입력 데이터의 지원과 건설 장비 운영 계획에 다시 사용되어 건설 관련 정보의 효율적 활용이 가능하다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 춘계 학술논문 발표대회
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• pp.189-191
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• 2013

Analysis of cable net facade by examing the literature and technical manual for it's characteristics, types, elements of construction management. And it will be performed research on the construction quality management such as development of guidelines and specification, analysis of the structural behavior.

• 한국주거학회논문집
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• 제23권2호
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• pp.115-124
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• 2012

The purpose of this study was to analyze the types and characteristics of space construction in temporary small-sized housing for single-person household through the understanding and interpretation of the modern flexible lifestyle. A document research method and case studies were used to analyze and classified the spatial characteristics of temporary dwelling spaces since 2000. Findings of the study were as follows: In order to conform the concept of temporary dwelling for small-sized housing units of single-person households, the types and characteristics of space construction were divided into three aspects: (1) 'Transporting' by wheel, rotation and vehicles, (2) 'Transforming' by adapting, assembling disassembling, and folding unfolding, (3) 'Wearing Carrying' by inflatable and tented type. In conclusion, this study found two types of space construction in temporary small-sized housing. The first was 'formal aspect' which was focused on the simplicity of shape, ease of deformation and lightweight of materials. And the second was 'functional aspect' which was focused on the complex space composition, the rapidity of installation and dismantling, ease of movement and transportation. This study shows that the combination of two types of the temporality will be more ideal in temporary small-sized housing planning rather than relying on just one type.

• 한국BIM학회 논문집
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• 제7권2호
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• pp.25-35
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• 2017

Building information modeling (BIM) can improve to communicate with project participants by early construction involvement (ECI) from the beginning of the project. Therefore, they can minimize design changes and improve design quality and construction. However, because there is insufficient research on the scope and application level of BIM according to project delivery system and project characteristics, construction companies have efficiently not been using the BIM. Therefore, this study intends to conduct basic research as a basis for confirming appropriate BIM application and level according to project delivery system and project characteristics. To do this, we investigated the project delivery system and project characteristics of domestic and foreign projects that have successfully applied BIM, and compare and analyze them based on BIM application and BIM level framework derived from theory reviews and experts. Therefore, this study can be used as a basis for strategically establishing the scope and level of BIM according to project delivery system and project characteristics through the result of this study.