• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.112-116
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• 2008

Determining the investment priority of the railway project is essential to keep its object of railway investment. [National railway construction plan] provide 4 major evaluation indicators and their weighting range in determining the investment priority of railway construction. Which are investment efficiency, inter-regional balance of development, network effects, government supporting policy. However this present criteria has inconsistency in determining economical feasibility of the railway transportation when applying the same evaluation indicator, investment efficiency, with the road transportation. The railway transportation is superior to road transportation in terms of transportation capacity and distance, while offering less carbon emissions. In spite of the prominent position of the railway transportation, it can be failed to obtain its proper investment priority when being determined under economical feasibility based. Therefore, this study analyzed the inconsistency under present evaluation criteria and proposed new evaluation method for the investment priority of the railway construction using AHP(analytic hierarchy process), while differentiate from the road construction. This method is optimized for only determining the priority of the railway construction itself under object of railway investment respectively.

• 한국건설관리학회논문집
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• 제24권5호
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• pp.73-82
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• 2023

Optimization of Construction Site Layout Planning (CSLP) heavily relies on workers' travel paths. However, traditional path generation approaches predominantly focus on the shortest path, often neglecting critical variables such as individual wayfinding tendencies, the spatial arrangement of site objects, and potential hazards. These oversights can lead to compromised path simulations, resulting in less reliable site layout plans. While Deep Reinforcement Learning (DRL) has been proposed as a potential alternative to address these issues, it has shown limitations. Despite presenting more realistic travel paths by considering these variables, DRL often struggles with efficiency in complex environments, leading to extended learning times and potential failures. To overcome these challenges, this study introduces a refined model that enhances spatial navigation capabilities and learning performance by integrating workers' visibility into the reward functions. The proposed model demonstrated a 12.47% increase in the pathfinding success rate and notable improvements in the other two performance measures compared to the existing DRL framework. The adoption of this model could greatly enhance the reliability of the results, ultimately improving site operational efficiency and safety management such as by reducing site congestion and accidents. Future research could expand this study by simulating travel paths in dynamic, multi-agent environments that represent different stages of construction.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.705-711
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• 2022

Roadway lighting is an integral element of a highway system. Luminaires on roadways provide viewing conditions for drivers and pedestrians during nighttime in order to improve safety. It is time-consuming and labor-intensive to manually measure roadway illuminance at predetermined spots with a handheld illuminance meter. To improve the efficiency of illuminance measurement, a remote-control electrical cart and a drone were utilized to carry an illuminance meter for the measurements. The measurements were performed on the marked grid points along the pavement. To measure the illuminance manually, one person measures illuminance at each grid point with the handheld meter and another person records the illuminance value. To measure the illuminance with the remote-control cart, the illuminance meter is attached to the cart and it measures illuminance values continuously as the cart moves along the grid lines. With the drone, the meter records the illuminance continuously as the drone carries the meter and flies along the grid line. Because the drone can fly at different heights, the measurements can be done at different altitudes. The illuminance measurements using the cart and the drone are described in detail and compared with manual measurements in this paper. It is shown through this study that automated measurements can greatly improve the efficiency of roadway illuminance data measurements.

• 국제학술발표논문집
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• The 7th International Conference on Construction Engineering and Project Management Summit Forum on Sustainable Construction and Management
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• pp.52-61
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• 2017

Considering its significant impact on the cost and schedule of construction projects, formwork as one part of temporary facility categories in construction should be arranged precisely. Current practice in the formwork planning is often conducted manually and repetitively, causing low efficiency and time waste. This study proposes an automated framework to generate more accurate and detailed formwork plans by utilizing information from building information modeling (BIM) considering the adequate geometric and semantic information provided by the BIM model. The dimensions and quantities information of elements in a building can be extracted automatically. Then, a rule is prepared for calculating the required forms erected around elements based on the contact areas. Finally, an algorithm of integrating first fit decreasing (FFD) with coordinated bottom left (CBL) is applied to automatically generate the formwork plan. The BIM-based automated planning framework is demonstrated by an illustrative example. The results show that the proposed framework can generate the formwork plan accurately and automatically, and significantly improve the efficiency in the formwork plan and reuse.

• 한국건설관리학회논문집
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• 제21권4호
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• pp.50-61
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• 2020

건설산업에서 안전관리가 오랫동안 중요한 화제중의 하나로 대두되고 있으며 수많은 노력에도 불구하고 여전히 타 산업에 비해 높은 재해율을 보이고 있다. 이와 관련되어 많은 연구들이 진행되었으며, 대부분 시공자 또는 시공단계를 중심으로 진행되었다. 그러나 사업초기단계가 건설안전에 미치는 영향이 가장 높고 발주자 등 사업초기단계의 의사결정자들이 중요한 작용을 함에도 불구하고, 아직까지 건설사업 생애주기를 포괄하는 안전관리체계가 미흡한 실정이다. 게다가 건설사업에서 방대한 정보가 생성되지만, 이러한 정보들은 각 생애주기를 거듭할수록 정보들의 가치가 증가하는 반면에 비효율적인 측면을 보이고 있다. 이는 참여자들 간의 부족한 정보 공유 및 전달과 미흡한 표준으로 인한 것으로 판단되며, 이는 또한 정보가치들의 손실을 야기한다. 따라서 본 연구에서는 건설산업 측면에서 안전관리 정보이양의 효율성을 분석하는 것을 목적으로 하며, 이를 위해 우선적으로 건설안전 정보를 체계적이고 효율적으로 관리 및 활용하기 위한 안전관리 Framework을 '안전관리 업무기능', '건설사업 생애주기', '산업위계'를 포괄하여 제안하고, '안전관리 업무기능'을 계층적 구조로 5개의 대분류, 13개의 중분류, 32개의 소분류로 세분화함으로써 Framework을 구체화하였다. 다음으로, 안전정보이양의 효율성을 분석하기 위해 '업무기능의 중요도'와 '정보이양의 효율성'을 평가지표로 설정하고 전문가 인터뷰를 통해 평가를 실시하였다. 본 연구결과는 건설산업에서 안전관리를 보다 체계적이고 효율적으로 구현하는 기반을 마련하고 나아가 안전관리 역량을 강화하기 위한 기초자료로의 활용을 기대한다.

• 한국안전학회지
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• 제17권3호
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• pp.96-101
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• 2002

The object of risk assesment is to prevent the accident from arising. The main reason for risk assesment of construction work is to determine priority order of improvement plan about risky work. Formwork is a complicated process that determines the total duration of apartment construction, and occupies 10∼15% of total construction expense, and 17% of serious accidents occur during formwork. So, formwork occupies very importment roles in work sites, economical efficiency and safety. We need to identify the work type with a high risk of accidents, and to establish suitable safety counterplan and implement intensive safety management.

• 한국안전학회지
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• 제14권3호
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• pp.155-162
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• 1999

Small and medium-sized construction sites are most serious in Occupational Safety and Health in the construction industry. The safety consulting engineering has been launched, in 1995, to improve the safety environments and prevent serious injuries and fatalities accidents. The purpose of this study is to analyze the effect of the safety consulting engineering for small and medium-sized construction sites. This study conducts a number of interviews with experienced contractors, consulting engineers, etc. And the questionnaire survey was peformed with 111 respondents. This paper presents several improvements to increase the efficiency of the safety consulting system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1999년도 춘계학술대회 논문집
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• pp.367-374
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• 1999

The selection of geogrid types for the use of reinforced rail roadbed is important in the design of railways. Also, the problem of the construction damage on the geogrid during construction is raised by the field engineers. Therefore, laboratory model tests were peformed to investigate the efficiency of the bearing capacity and construction damage. As a result, it was found that the bearing capacity of the rigid geogrid reinforced railroad ballast shows 1.54 times higher than that of the flexible geogrid reinforced case. In addition, there were no noticeable damage during construction.

• 한국시뮬레이션학회논문지
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• 제9권4호
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• pp.59-66
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• 2000

Computer has been many effect in diverse field of mankind and it brings development of educational field like CAI. Also development of internet and If bring rapid growth of cyber school and it is required multimedia environment and efficient cyber school construction package for efficient management. In this paper we develop multimedia education-network construction package for cyber school using intranet. It will reduce the cost of management and construction for small and medium size cyber school, and it will raise efficiency of cyber school.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 춘계학술대회 논문집
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• pp.407-414
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• 2000

Recently the geogrids are being used in some large projects such as Inchon International Airport construction, highway construction, and Korean High-Speed Railway construction with not only the merit of simple construction but also reinforcing efficiency for the soft ground. Main function of roadbed is to provide a stable foundation in terms of bearing capacity and settlement for the subballast and ballsat layers. Differential settlement of the railroad should be avoided. The cyclic laboratory model tests were performed to investigate the settlement behavior of geogrid reinforced railroadbed. The ratio of settlement of roadbed under cyclic loading with three layers of geogrid reinforced is less than 1/2 of the roadbed thickness without reinforcement.