• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(2)
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• pp.1291-1292
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• 2005

• 한국철도학회논문집
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• 제2권2호
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• pp.1-5
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• 1999

Based on the development of designed technology for aluminum carbody. the prototype aluminum carbody has been constructed. All extrusion profiles required for the carbody has been produced and their quality has also been proven. For sound construction. welding technology to join aluminum extrusion profiles has been developed and jigs for precise assembly of blocks have been made. The aluminum carbody for urban subway train has been completed with the required chamber being set and the welding deformations being constrained by jigs. The safety of the carbody structure has also been proven by the static load test. And also, painting technology has been developed and the surface of the carbody has been pre-treated and painted. The developed technology to construct the aluminum carbody can be used in mass production of aluminum cars ordered by domestic and foreign customers.

• The Journal of Asian Finance, Economics and Business
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• 제9권4호
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• pp.307-314
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• 2022

The construction and real estate industries contribute significantly to each country's economic development. Strong construction and real estate firms will contribute more to the country's GDP by contributing to the industry's development. The purpose of this study is to examine the factors that influence the performance of the construction and real estate sectors in Vietnam. A survey of 200 construction and real estate firms in different areas was conducted from 2020 until the end of 2021. Following the removal of errors, the author got 196 replies, 6 of which were invalid, leaving 190 votes for quantitative analysis. The research findings show that elements such as (1) senior executives' commitment to the organization, and (2) the ability to use technology have a positive and significant impact on firm performance when using advanced econometric analysis. Furthermore, in the case of Hanoi, Vietnam, business relationships have a positive impact on firm performance. Training and development, as well as the working environment and incentives, have little effect on the profitability of construction and real estate firms. Finally, the research also has some recommendations and limitations for the construction and real estate sector.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 추계 학술논문 발표대회
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• pp.120-121
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• 2019

The construction industry is known to be one of the representative industries that generate fine dust. Therefore, reducing the amount of fine dust generated in construction sites is very important for the overall fine dust management. Based on this, this study proposed the concept of fine dust measurement and removal technology combined with advanced technologies such as drones and IoT. The qualitative, quantitative and risk elimination effects that can be expected when applying the proposed technique are analyzed. We will verify the effectiveness of the proposed concept through system development and field application, and evaluate specific economic feasibility through cost analysis. The proposed concept will be validated through system development and field application and evaluated specific economics through cost analysis.

• 한국산업융합학회 논문집
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• 제26권6_3호
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• pp.1233-1241
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• 2023

This paper investigates the efficient application of drone LiDAR technology for acquiring precise point cloud data in construction and civil engineering. A structured workflow encompassing data acquisition, processing, and accuracy verification is introduced. Practical testing on a construction site affirms that drone LiDAR surveying yields accurate and reliable data across various applications. With a focus on accuracy and verification, the results contribute to the progression of surveying methodologies in construction and civil engineering. The findings provide valuable insights into the dynamic technological landscape of these fields, establishing a foundation for more effective and precise surveying techniques. This study underscores the transformative potential of drone LiDAR technology in shaping the future of construction and civil engineering survey practices.

• 디지털융복합연구
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• 제11권2호
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• pp.137-148
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• 2013

본 논문의 목적은 항만해상풍력단지 건설을 위한 기술개발 로드 맵을 제시하는 것이다. FGI(Focus Group Interview)와 설문지를 이용한 AHP(Analytical Hierarchy Process) 방법을 적용해서 대/중/소 분류된 건설기술의 가중치를 도출했고, 분류된 건설기술에 대한 우선순위를 근거로 항만해상풍력단지 건설기술 로드 맵이 수립되었다. 기술 로드 맵은 항만해상풍력단지의 분류된 건설기술에 대한 R&D 사업을 달성하기 위한 20년간(2016년부터 2036년 까지)의 일정을 제시하고 있다. 이러한 건설기술 로드 맵은 녹색항만건설산업의 R&D 전략을 수립하기 위한 이정표로 활용될 수 있다.

• 한국건설관리학회논문집
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• 제24권3호
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• pp.12-19
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• 2023

건설업의 경우 공사기간 내에 최소한의 수수료로 완제품을 인도할 수 있도록 공정과 원가의 관계를 적절히 분배해야 한다. 이때 교량의 크기, 공법, 공장의 환경과 생산능력, 운송거리 등을 고려해야 한다. 그러나 공사기간 중 발생하는 다양한 원인으로 인해 공사지연, 공사비 상승, 품질 및 신뢰성 저하 등의 문제가 발생하고 있다. 따라서, 기존의 방식에서 탈피하기 위해서는 체계적이고 과학적인 시공기술과 공정관리 기술이 필요하다. 프리팹(Pre - Fabrication)은 공장에서 제작하여 현장에서 시공하는 대표적 OSC(Off-Site Construcation) 공법이다. 본 연구에서는 프리팹 교량 거더인 Nodular 거더의 공정관리를 위한 자원 및 공정계획 최적화 시스템 개발이다. 인력, 장비 동원 계획의 다양한 변수를 자동으로 테스트하여 최적의 값을 도출하는 시뮬레이션 알고리즘을 개발한다. 그리고, 건설 중인 파주-포천 고속도로 건설공사(3공구) 도하 4교에 알고리즘을 적용하여 그 결과를 비교한다. 건설공사 표준품셈을 근거로 액티비티 카드에 실제 투입된 인력, 장비 종류, 수량 등을 적용하고, 작업량, 자원계획, 자원소요량을 반영했다. 향후 다양한 현장 데이터를 포함한 예측기법을 적용하여 프로그램의 정확도를 높일 계획이다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회
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• pp.486-493
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• 2010

Recently, it has been a worldwide issue to develop offshore wind farm based on the past technical experiences of onshore wind turbine installation. In Korea, the government has the wind-energy to be a new-sustainable field of development to bring green-growth in near future and put political and fiscal efforts to support the academic and industrial technical development. Especially, there are much advancement for the fields of turbine, blade, bearing, grid connection, ETC. Correspondingly, technical needs do exist for the offshore foundation installation techniques in geotechnical point of view. Within few years, 2~5MW offshore wind turbines will be constructed at about 30m water depth and it is known that monopiles of D=4~6m are suitable types of foundation. In order to construct offshore wind-turbine foundation, technical developments for drilling machine, design manual, monitoring&maintenance technique are required. This paper presents technical issues with related to offshore wind farm and large diameter monopile in the point of renewable energy development.

• Geomechanics and Engineering
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• 제34권3호
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• pp.303-316
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• 2023

With the development and utilization of urban underground space, the artificial ground freezing technology has been widely used in the construction of underground engineering in soft soil areas. The mechanical properties of soft clay changed greatly after freezing and thawing, which affected the seismic performance of underground structures. In this paper, a series of triaxial tests were carried out to study the dynamic response of the freezing-thawing clay under the seismic load considering different dynamic stress amplitudes and different confining pressures. The reduction factor of dynamic shear stress was determined to correct the amplitude of the seismic load. The deformation development mode, the stress-strain relationship and the energy dissipation behavior of the soft clay under the seismic load were analyzed. An empirical model for predicting accumulative plastic strain was proposed and validated considering the loading times, the confining pressures and the dynamic stress amplitudes. The relevant research results can provide a theoretical reference to the seismic design of underground structures in soft clay areas.

• Metals and materials international
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• 제24권6호
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• pp.1412-1421
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• 2018

Cold-expanded austenitic high nitrogen steel (HNS) was subjected to investigate the effects of grain size on the stress-controlled high cycle fatigue (HCF) as well as the strain-controlled low cycle fatigue (LCF) properties. The austenitic HNSs with two different grain sizes (160 and $292{\mu}m$) were fabricated by the different hot forging strain. The fine-grained (FG) specimen exhibited longer LCF life and higher HCF limit than those of the coarse-grained (CG) specimen. Fatigue crack growth testing showed that crack propagation rate in the FG specimen was the same as that in the CG specimen, implying that crack propagation rate did not affect the discrepancy of LCF life and HCF limit between two cold-expanded HNSs. Therefore, it was estimated that superior LCF and HCF properties in the FG specimen resulted from the retardation of the fatigue crack initiation as compared with the CG specimen. Transmission electron microscopy showed that the effective grain size including twin boundaries are much finer in the FG specimen than that in the CG specimen, which can give favorable contributions to strengthening.