• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.508-512
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• 2015

Carbon emission calculation guidelines provided by the Korean Ministry of Land, Infrastructure and Transportation (MOLIT) and existing environmental load assessment studies have suggested a method for estimating based on the volume determined after the design development. Therefore they are not being helpful in the decision making of the environmental economics of road facilities in the planning stage in which specific information on construction output volume is lacking. Based on literature analysis of existing studies and consultation from a group of construction environmental professionals, 12 types of property information considered to be related to environmental load were selected from an inventory of information that will be available in the road planning stage. In addition, multiple regression analysis was performed based on the environmental load computed through the life cycle assessment (LCA) of 40 national highway project cases of Korea to deduce five impact factors of environmental load in the road facilities planning stage.

• 한국도로학회논문집
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• 제18권3호
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• pp.109-114
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• 2016

PURPOSES : The demand for extending national highways is increasing, but traffic monitoring is hindered because of resource limitations. Hence, this study classified highway segments into 5 types to improve the efficiency of short-term traffic count planning. METHODS : The traffic volume trends of 880 highway segments were classified through R-squared and linear regression analyses; the steadiness of traffic volume trends was evaluated through coefficient of variance (COV), and the normality of the data were determined through the Shapiro-Wilk W-test. RESULTS : Of the 880 segments, 574 segments had relatively low COV and were classified as type 1 segments, and 123 and 64 segments with increasing and decreasing traffic volume trends were classified as type 2 and type 3 segments, respectively; 80 segments that failed the normality test were classified as type 4, and the remaining 39 were classified as type 5 segments. CONCLUSIONS : A theoretical basis for biennial count planning was established. Biennial count is recommended for types 1~4 because their mean absolute percentage errors (MAPEs) are approximately 10%. For type 5 (MAPE =19.26%), the conventional annual count can be continued. The results of this analysis can reduce the traffic monitoring budget.

• 한국건설관리학회논문집
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• 제15권6호
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• pp.26-34
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• 2014

도로공사는 선형적이고 반복적인 공사로 공사의 특성상 건설장비에 대한 의존도가 높기 때문에, 건설장비의 효율적 운용에 의한 생산성 향상 및 공사비 절감 효과가 크다. 또한, 도로공사는 시공순서, 현장상황, 적용 공법에 따라 다양한 건설 장비의 선택이 가능하기 때문에 공정계획 시, 공종 간 연계에 따른 세부 작업 및 공법을 고려하여야 한다. 시공자는 현장조건에 맞는 작업을 선택하고 투입될 장비의 종류 및 성능, 수량 등을 사전에 파악하여, 적절한 건설장비 운용계획의 수립을 통한 경제성 향상 방안을 마련해야 한다. 하지만 한정된 유사 공사의 실적정보 및 체계적인 공사계획 방법의 부재로, 적정한 공정계획 수립이 용이하지 않으며, 공법 및 건설장비의 선정에 있어 대부분 경험과 직관에 의존한 공사를 수행하고 있다. 그 결과 시공 이전 공정계획단계에서 수립된 계획은 실행단계에서의 충분한 타당성을 확보하지 못하여 그 활용도가 제한적이다. 본 연구는 일반적인 도로공사의 초기 공정계획 수립단계에서 적용가능한 주요 공종별 공정로직을 개발하고, 공종 별 세부 시공절차 분석을 통하여 현장상황 및 공종에 적용 가능한 건설장비 운용 방안을 제시하였다. 또한 공정로직에 따른 다양한 건설장비 대안들을 대상으로 프로세스 시뮬레이션을 활용하여 경제성 기반의 최적화 장비조합 방안을 개발하였다. 개발된 방법을 이용하여, 계획단계에서의 수립된 다양한 공정계획에 대해 효율성을 평가하고 최적의 자원 선정을 위한 의사결정에 도움을 줄 것으로 판단된다.

• 유통과학연구
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• 제20권3호
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• pp.23-31
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• 2022

Purpose: The purpose of this study is to analyze the Safety and Logistical Distribution Management system in Thailand's Highway Work Zone based on data from Logistics drivers. Accidents in highway construction zones have caused enormous casualties in Thailand yearly. Statistical data shows evidence of correlation between numbers of accidents and drivers' recklessness. Research design, data, and methodology: In this study, we conducted an in- depth interview with 414 logistics drivers and highway construction workers in Khon Kaen province, Thailand. The data was collected based on 63 questionnaires aiming at capturing factors contributing to the risk of safety and cause of accidents in logistic infrastructures such as Highway work zone. Results: The result reveals two significant factors affecting safety in highway work zone, which includes construction environment and safety management system. Moreover, the result shows that feeling of afraid and confused while driving within the construction zones significantly affecting driver's risk of having an accident. Conclusions: The findings of this study offer that a strategic planning and evaluation of the logistics drivers' satisfaction and construction workers' participation to mitigate highway accidents at construction zones and that drivers' knowledge and perception toward construction safety management plays a significant role in preventing highway accidents at the construction areas.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권8호
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• pp.2473-2489
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• 2022

Urban development has brought about the increasing saturation of urban traffic demand, and traffic congestion has become the primary problem in transportation. Roads are in a state of waiting in line or even congestion, which seriously affects people's enthusiasm and efficiency of travel. This paper mainly studies the discrete domain path planning method based on the flow data. Taking the traffic flow data based on the highway network structure as the research object, this paper uses the deep learning theory technology to complete the path weight determination process, optimizes the path planning algorithm, realizes the vehicle path planning application for the expressway, and carries on the deployment operation in the highway company. The path topology is constructed to transform the actual road information into abstract space that the machine can understand. An appropriate data structure is used for storage, and a path topology based on the modeling background of expressway is constructed to realize the mutual mapping between the two. Experiments show that the proposed method can further reduce the interpolation error, and the interpolation error in the case of random missing is smaller than that in the other two missing modes. In order to improve the real-time performance of vehicle path planning, the association features are selected, the path weights are calculated comprehensively, and the traditional path planning algorithm structure is optimized. It is of great significance for the sustainable development of cities.

• 교통기술과정책
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• 제8권5호
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• pp.79-85
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• 2011

• 한국측량학회지
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• 제20권4호
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• pp.367-374
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• 2002

주요 간선도로의 유지관리는 도로 발전 과정의 계획 단계에서 고려되어야 하는 중요한 문제이다. 많은 도로 유지 관리 시스템들이 좀더 효율적인 의사 결정을 통해 정밀하게 유지보수 비용과 도로포장 비용을 산정 할 수 있도록 개발되었지만 이러한 시스템은 유지관리 비용을 줄이는데 별다른 도움을 주지 못했다. 본 연구에서는 도로 계획 단계에서 도로 설계의 특성들을 최적화함으로써 도로의 설계 수명동안 발생하는 유지보수 관리비용을 감소시켰으며, 절성토면의 경사에 비중을 두고 유지보수 비용을 최소화 할 수 있는 설계변수들에 기초한 초기비용 및 유지보수 비용을 공식화하였다. 도로 유지보수비용은 측면경사와 도로 횡단폭 그리고 연 평균 일일 교통량으로 표현되었다. 적용된 모델지역은 충북 청주-상주간의 실제 지형 데이터베이스를 사용하였으며, 도로 선형 결정시 도로 유지보수 비용과 토질 특성의 민감한 사안들을 조사하기 위해 제시하였다. 결과는 도로 유지보수 비용과 토질 특성은 도로선형 최적화에 중요한 고려사항임을 알 수 있었다.

• Advances in environmental research
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• 제4권4호
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• pp.211-218
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• 2015

Traffic noise estimation models are useful in evaluation of the noise pollution in current circumstances. They are helpful tools for design and planning new roads and highways. Measurement of average traffic noise level is possible when traffic speed and volume are known. The objective of this study was to devise a model for prediction of highway traffic noise levels based on current traffic variables in Iran. The design of this model was to take the impact of traffic congestion into consideration and to be field tested. This study is a library research augmented by field study conducted on Saeedi Highway located south west of Tehran. The period for the field study lasted 5 days from 7-12 February, 2013. This study examined liner and non-liner methods in formulation of its model. Liner method without a fixed coefficient was the best fit for the intended model. The proposed model can serve as a decision making tool to estimate the impact of key influential factors on sound pressure levels in urban areas in Iran.

• 한국도로학회논문집
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• 제15권3호
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• pp.85-92
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• 2013

PURPOSES: The purpose of this paper is to estimate expected effects on traffic operational and economic aspects of 2+1 roads application in Korea. METHODS : Micro simulation study using VISSIM 5.0 was used to analyze the operation efficiency of 2+1 roads compared to two-lane highways and four-lane highways. Some scenarios for various traffic volumes were set up in order to analyze the effect of 2+1 roads under various traffic situations. Also imaginary road networks were set up for each type of roads. The MOEs to measure the operation efficiency were selected with average travel speed and delay. For analyzing economic effect of 2+1 roads, construction cost of a specific imaginary 2+1 road was compared to construction cost of a four-lane highway with same conditions. RESULTS: The results of study show that a 2+1 road is more effective with 19 percents higher average travel speed and 39 percents lower average delay than a two-lane highway. In the economic analysis, construction costs to construct a 2+1 road are saved as approximately 26.4~40.7 percents when compared to construction of four-lane highway. CONCLUSIONS: It can be concluded that 2+1 roads can improve the traffic operational level of service for two-lane highways and 2+1 roads can be applied as an effective design alternative for higher-volume two-lane highways in Korea.

• Journal of Construction Engineering and Project Management
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• 제6권4호
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• pp.7-14
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• 2016

While the idea of the existence of a set of key factors for success in planning, designing and construction of projects is not new, it remains one of the most important issues in the field of construction management. This is due to project success factors are inputs to project management practice which can lead directly or indirectly to project success. This study identifies the success factors which can be used for improving the highway projects performance in Egypt during the project pre-construction and construction phases. Through a detailed literature review 35 success factors are identified. Furthermore, the AHP is adopted to prioritize the studied factors through the application of questionnaire survey. The study establishes that implementing an effective quality control and assurance systems, allow sufficient time for feasibility studies, design, drawing and tender preparation, effective cost control system and frequency of project budget updates, preparing adequate designs and drawings and determining sufficient time to implement the desired scope of work are the most important success factors for enhancing the highway projects performance in Egypt.