• 한국건설관리학회논문집
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• 제23권6호
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• pp.54-64
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• 2022

국내 건설산업의 지속적인 노령화 및 인력부족 문제는 노동집약적 건설업의 특성과 지속되는 청년층의 건설업계를 향한 부정적 이미지가 증가하는 현실을 감안할 때 더 이상 미래의 문제가 아니라 국내 건설업의 생존을 위해 꼭 해결해야할 선결과제임에 틀림없다. 본 연구는 국내 건설산업이 직면한 건설 인력부족의 근원적인 문제점을 조명하고 인력부족문제를 해결하기 위해 최근 5년간 패스트트랙 성향의 신속한 대응책을 마련하고 있는 영국의 MMC 사례와 약 20년간의 중장기적인 대응방안을 모색하고 있는 싱가포르의 Buildability 사례를 비교분석함으로써 양국이 제시하는 전략적 대응방안의 시사점을 도출하고 유사한 전략을 구사하기 위한 방안을 제안하였다. 그리고 본 연구가 제시한 대응전략을 프로세스 다이어그램으로 제시하여, 향후 전략개발의 방향성을 명확히 하였다.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.563-570
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• 2022

Industrialized and modular construction is a growing construction technique that can transfer a large portion of the construction process to off-site fabrication yards. This method of construction often involves the fabrication, pre-assembly, and transportation of massive and long volumetric modules. The module weight keeps increasing as the modules become more complete (with infill) to minimize the work at the site and, as higher productivity can be achieved at the fabrication shop. Thus, a volumetric module delivery gets more challenging and risky. Despite its importance, past research paid relatively insufficient attention to the problem related to the lifting of heavy modules. This can be a complex and time-consuming problem with multiple lifting for transportation-and-installation operations both in fabrication yard and jobsite, and require complex crane operations (sometimes, more than one crane) due to crane load capacity and load balance/stability. This study investigates this problem by focusing on the structural perspective of lifting such long volumetric modules through simulation studies. Various scenarios of lifting a weighty module from the top using four lifting cables attached to crane hooks (either a single crane or double crane) are simulated in SAP software. The simulations account for various factors pertaining to structural indices, e.g., bending stress and deflection, to identify a proper method of module lifting from a structural point of view. The method can identify differences in structural indices allowing identification of structural efficiency and safety levels during lifting, which further allows the selection of the number of cranes and location of lifting points.

• 대한수학회보
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• 제50권1호
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• pp.201-216
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• 2013

In this note, we consider the Riemann problem for a two-dimensional nonstrictly hyperbolic system of conservation laws. Without the restriction that each jump of the initial data projects one planar elementary wave, six topologically distinct solutions are constructed by applying the generalized characteristic analysis method, in which the delta shock waves and the vacuum states appear. Moreover we demonstrate that the nature of our solutions is identical with that of solutions to the corresponding one-dimensional Cauchy problem, which provides a verification that our construction produces the correct global solutions.

• East Asian mathematical journal
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• 제38권1호
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• pp.85-94
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• 2022

Recently, an LWE-based commitment scheme is proposed. Their construction is statistically hiding as well as computationally binding. On the other hand, the construction of related zero-knowledge protocols is left as an open problem. In this paper, we present zero-knowledge protocols with hardness based on the LWE problem. we show how to instantiate efficient zero-knowledge protocols that can be used to prove linear and sum relations among these commitments. In addition, we show how the variant of LWE, spLWE problem, can be used to instantiate efficient zero-knowledge protocols.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.217-220
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• 2015

Because of the recession of the Korean construction market, many construction companies are expediting overseas business. Despite the rapid growth of international markets, the polarization of profit with SMCCs (Small and Medium Construction Companies) and large construction companies in the international construction market has become more serious. This problem causes competition to provide the lowest prices, which makes the future of overseas business for the SMCCs uncertain. Thus, the SMCCs require a reasonable capability evaluation system for overseas business. However, the existing evaluation methods focus on large construction companies. To address this problem, this study proposes a system to evaluate the overseas business capabilities. The 27 indicators to evaluate the overseas business capabilities are derived from a literature review and are verified through expert interviews. The indicators are classified into 4 large categories, and a questionnaire-based survey of 50 Korean SMCCs is conducted to analyze the correlation between overseas business capability and the indicators. The system expects to provide the effect of the indicators on the overseas business capability and the chance to evaluate the capability for overseas business.

• 한국컴퓨터산업학회논문지
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• 제5권4호
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• pp.503-510
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• 2004

이 논문은 모듈 프로그램 안에서 전문가 시스템 소프트웨어 유지 보수에 관한 기존 논문을 분석하고 건설 라인 공정의 문제점을 표준 시스템을 적용, 전문가 시스템으로 해결하는 과정에서 전문가 시스템 소프트웨어 프로그램의 재생성 모듈을 기술하였다. 끝으로 CES(Construction Expert System)라는 프로그램 타입 시스템을 적용 검증했고 전문가 시스템 소프트웨어 프로그램을 통해 대형 건설 과정의 유지 보수에 대한 프레임을 제시하였다.

• 한국학교수학회논문집
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• 제12권4호
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• pp.365-388
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• 2009

본 연구에서는 세 점이 조건으로 주어진 삼각형의 작도문제들 중에서 해결과정이 삼각형의 외접원 작도와 관련되는 문제들을 해결하고, 이들 작도문제 해결과정을 분석하여, 작도문제들 사이의 연결성을 밝혀 작도문제들을 체계화시켰다. 특히 Davydov의 이론적 지식에서 구체화의 개념을 바탕으로, 작도문제들이 일관된 체계를 형성해가는 과정을 상세하게 기술하였다. 이를 통해 이론적 지식의 구체화의 과정, 작도문제 해결의 교수학적 활용, 교수학적 의의에 대한 폭넓은 논의를 위한 기초자료를 제공할 수 있을 것이며, 학생들의 창의적 수학탐구 활동의 소재로 활용될 수 있을 것으로 기대된다.

• 대한안전경영과학회지
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• 제6권3호
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• pp.41-52
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• 2004

Construction Management(CM) that is the business innovation and method of construction management is introducing and implying the needs to improve high cost and low productivity structure and cope with very variable changes of construction market in construction industry within the country. But, safety management system is a very insignificant thing under CM. Consquently, We had been needed for the improvement about what the problem was. Therefore, My study raised the problem to the system and management by making a comparative study of the feature of the management method and the content of the accomplishment of safety management by using the consideration of the case about a big field of construction work implying CM within the country and proposed the active method of safety management.

• 한국건축시공학회지
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• 제9권3호
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• pp.79-85
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• 2009

Labor productivity issues within the construction industry are receiving increasing attention. With the improvement in the standard of living, domestic laborers are avoiding 3D(Difficult, Dirty, and Dangerous) jobs by degrees. Because of this situation, the problem of insufficient labor is exacerbating in several basic industries. In particular, insufficient labor is a serious problem in the construction sector, where the workers are ageing and labor costs are increasing. In this study, we adopt a systematic approach to identify factors that influence labor productivity and analyze the causality between the factors and their ripple effects with the aim that the results of the study will help improve labor productivity and ensure its effective management. The established labor productivity model using systems thinking will get a footing in the greatest strategy in the construction industry.

• 대한안전경영과학회지
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• 제24권4호
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• pp.71-83
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• 2022

This study is to investigate the degree of field awareness of how each provision of the Serious Disaster Punishment Act will affect accident prevention. As a result of conducting a survey of construction site workers, it was analyzed that construction site workers had a low sense of safety and did not voluntarily engage in safety activities. And it can be seen that they are taking a very passive position that it is efficient to implement safety under the supervision of the supervisor. Workers who need voluntary construction site safety activities are most aware of the situation at the site, but the problem was pointed out as "lack of procedures for listening to opinions and preparing improvement measures" for these problems. Future research is needed to see if this is a problem for individual workers or for those in charge of safety and health who do not correct it even though active opinions have been submitted.