• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.3A
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• pp.227-234
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• 2009

Recently, a knee brace is usually installed in connection between cross-beam and main-girder of steel box-girder bridges. The knee brace is installed as a structural stiffener and mainly aims to relieve stress at joints and to prevent main-girder from lateral deformation. However, research on the knee brace is insufficient to obviously evaluate the necessity. The stiffened effect of knee brace is determined by using finite element analyses. Stress distribution, stress level of members and deflection of the cross-beam are evaluated by parametric FE analysis for the installation of knee brace and the depth ratio of cross-beam/steel box girder. It is seen from comparison of numerical analysis results that the knee brace installed in cross-beam of steel boxgirders bridges is not efficient as a structural stiffener with respect to stress relief and stiffened effect.

• International Journal of Highway Engineering
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• v.11 no.1
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• pp.85-94
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• 2009

In cost estimation of construction, several methods including quantity-per-unit costing, job costing, unit cost estimation and lumpsum estimation are being utilized in Korea. Among them, a Quantity-per-unit Costing Method is used as a standard of cost estimation in public and private works. This paper presents the realistic job-costing method on all road construction tasks through statistical analyses with field survey data to solve the problems induced by the existing quantity-per-unit costing method. Furthermore, it was found that the newly developed job costing method is able to produce a simple costing procedure and a more actual construction cost estimation by a case study, which was performed to compare particular construction costs produced by two different methods, existing quantity-per-unit costing and newly developed job costing. These methods is compared by Case-study about sub-base. In the case of Job costing method, the estimate is shorter than the other case about 50% and can make up for the weak point about instrument in the current Standard of cost estimation. And it can be depict by Job Costing method about progress of work for using by a plan about construction management.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2004.11a
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• pp.95-100
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• 2004

본 논문은 도로 건설 공사 프로젝트들의 전 공정에 걸쳐 수행되는 모든 작업들을 대상으로 총 프로젝트 생산성 (Total Project Productivity)을 측정하고 분석하기 위한 방법을 소개한다. 측정 방법의 주안점은 복합적으로 병행되는 작업들의 생산량을 통합하여, 프로젝트 전체에 대한 포괄적인 생산성 값들을 구하는 방법을 개발하는데 두고 있다. 이 방법을 통해 Florida Department of Transportation (FDOT)로부터 발주된 세 개의 실제 고속도로 건설 공사 프로젝트들로부터 수천 개의 총 프로젝트 생산성 데이터 값들이 얻어졌으며. 이를 바탕으로 프로젝트 생산성을 분석하기 위한 방법의 타당성 검증이 이루어졌다. 그 결과로, 프로젝트 레벨에서의 총 생산성은 건설 작업들에 관한 현장 자료를 바탕으로 측정과 분석이 이루어질 수 있음이 입증되었다.

• 한국도로학회지:도로
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• v.15 no.4
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• pp.25-32
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• 2013

• 한국도로학회지:도로
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• v.4 no.4 s.14
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• pp.23-40
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• 2002

• KSCE Journal of Civil and Environmental Engineering Research
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• v.40 no.4
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• pp.409-415
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• 2020

Low-flow mortar injection method grouting technology was selected and the traffic area was preserved as much as possible in order to secure safety for road traffic when the outflow and subsidence of landfill occurred due to ground-water, and etc. In particular, the current existing method was newly improved since there are risks of damage such as hydraulic fracturing at the lower part of the road, spilling of soil particles on steep slopes, and bumps on the road due to excessive injection pressure during construction. This study was carried out at the site of reinforcement work on the road as a maintenance work for the danger zone for collapse of the steep slope of the 00 hill, which was ordered from the 00 city 00 province. The improved low-flow mortar type grouting method adopted a new automated grouting management system and especially, it composites the method for grouting conditions decision by high-pressure pre-grouting test and injection technology by AGS-controlled and studied about grouting effect analysis by using new technology. By applying the improved low-flow mortar type grouting method, it was possible to lay the groundwork for road maintenance work such as the prevention of subsidence of old roads, uneven subsidence of buildings and civil engineering structures, and of soil leakage of ground-water spills. Furthermore, the possibility of application on future grouting work not only for just construction that prevents subsidence of old roads but also for various buildings and civil engineering structures such as railroads, subways, bridges, underground structures, and boulder stone and limestone areas was confirmed.

• 프린팅코리아
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• v.14 no.10
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• pp.60-63
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• 2015

불황을 넘어 생존의 문제에까지 치달은 인쇄업계는 그야말로 내일을 기약할 수 없는 상황으로 내몰리고 있다. 이런 가운데 인쇄인의 의지를 꺾는 일이 또다시 발생해 인쇄인의 불만이 고조되고 있다. 한국도로공사가 전직 임직원의 친목단체인 도성회에 5년간 인쇄수의계약 308건을 편법적으로 몰아준 것이다.

• The Safety technology
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• no.145
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• pp.15-17
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• 2010

1969년 설립된 한국도로공사는 고속국도의 신설과 확장, 유지관리, 휴게 및 편의시설 설치 관리, 관련 업무에 대한 연구와 기술개발 업무를 담당하고 있다. 현재 우리나라 총 29개 고속도로 3,426km를 관리하고 있으며, 국민들이 언제나 안전하고 편안하게 고속도로를 주행할 수 있도록 24시간 최선의 노력을 다하고 있다.

• Journal of Korean Society of Transportation
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• v.26 no.1
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• pp.215-223
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• 2008

Due partly to lack of actual lane-changing data and partly to few studies on simulation functions to consider the lane-changing behavior, it may result in significant difference between simulation-based and real conditions. The objectives of this study are to estimate the set of mandatory lane-changing models and to analyze their features, depending on the merge control strategies under the lane-closed work zone operations. To achieve them, first, the elaborated calibration is required to simulate the mandatory lane-changing behaviors with the actual field data. Second, one can estimate their models with the logistic regression models, to obtain traffic variables as well as the lane-changing frequencies under the various levels of work zone traffic conditions. As a result, one can state that the well-calibrated simulation has the potential to properly reflect the target mandatory lane-changing behaviors. In addition, it should be mentioned that the set of proposed models is not practicable but preliminary result needed to identify the relations between the actual traffic conditions and lane-changing maneuvers and to develop their practical models for the actual applications.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.15 no.5
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• pp.83-94
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• 2016

Providing a voice alarm to drivers approaching a work zone could be an effective alternative to mitigate the potential safety problems of the work zone. This study conceived a voice alarm with a direction sound speaker and a field test was conducted that evaluated the feasibility of the voice alarm at a highway work zone. During the field study, we carried out on-site driver surveys to obtain drivers' perception and preference, collected approaching speeds, and measured sound level during the off-peak 2-hour for two days, respectively. The results showed that while the voice alarm has the potential to be an effective tool in improving safety, the alternative appeared to have the negative effect of noise. Further refinement to a voice alarm with a directional speaker is required to improve feasibility, and the results are expected to be utilized as basic data useful for the refinement.