• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.43 no.6
• /
• pp.821-830
• /
• 2023

Various studies has tried to unveil causes of cost overrun and schedule delay in the road construction project. However, these causes need standardization due to difference by guidelines, relevant research, and facilities. Therefore, this study identifies and elaborate standard road construction cost and schedule variation factors that can be used in the planning and execution of the project. variation factors have been derived and grouped through literature review and modified and supplemented through expert interview. In addition, the connection with the relevant guidance factors is confirmed and the usability is reviewed by applying actual road construction cases. The factors suggested in this study comprehensively include factors of related guidelines and previous research, more clearly distinguish, support decision making.

• Journal of the Korea Institute of Building Construction
• /
• v.15 no.4
• /
• pp.405-412
• /
• 2015

The procurement of public construction, which has been selected mainly on the basis of the work experience of a department of public agencies that award construction contracts or those in charge of ordering, has not been executed through an objective selection process considering the construction types or characteristics. Thus, as a preliminary study on developing a model for the selection of contract methods, this study intends to analyze and present the key factors affecting the selection of procurement methods in public construction. Through a literature review on the existing methods, foundational factors were first presented, based on the analysis of these factors, the final influence factors were proposed. As a result, 6 factors contractor's characteristics, the environment of the construction market, relevant organization, the characteristics of a project, costs, and responsibility factors were determined, and 14 sub-factors were selected. The factors presented in this study will be used as base data for developing a decision making support model for the selection of contract methods in public construction.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2022.05a
• /
• pp.105-105
• /
• 2022

섬진강댐은 100년빈도 홍수에 대응토록 설계되어 홍수조절 능력이 타 다목적댐 대비 상대적으로 취약함에 따라 댐운영 체계 개선이 필요하다. 이에따라 K-water는 홍수시 피해를 최소화 할 수 있도록 댐운영과 관련한 홍수대응 체계를 개선하였다. 주요 개선대책은 섬진강 홍수조절용량 추가확보, 홍수기 강우특성을 고려한 홍수조절, 하류주민 및 기관과 소통에 기반한 정보 공유체계 확립, 디지털 트윈 기반 댐 운영 의사결정시스템 구축이다. 섬진강댐의 건설홍수조절용량은 3천만m³으로, 타 다목적댐 설계빈도인 200년 대비 홍수대응 능력이 미흡하다. 이에따라, 섬진강댐은 '21.1월부터 '22.12월까지 홍수기 제한수위를 기존 197.7m에서 2.5m 낮춘 194.0m로 시범운영하고 있다. 이를통해 기존 3천만m³에서 9천만m³까지 6천만m³의 홍수조절용량을 추가 확보하였다. 이와 연계하여 홍수기 동안 섬진강댐 운영수위 기준을 별도 수립하여 홍수기 전·후반으로 나누었으며, 전반기(~7/31)는 '20년 홍수상황에서 발생한 더블피크 집중호우(360mm)에 대응가능한 홍수조절능력을 확보하고, 후반기(8/1~)는 홍수조절능력을 최대한 확보함과 동시에 차년도 용수공급을 대비할 수 있도록 운영수위를 개선하였다. 그간 수문방류 정보는 '댐 관리규정'에 따라 방류개시 3시간 전까지 방류계획을 하류지역의 지자체 및 주민에게 통보하였으나, 하류주민들이 충분히 사전준비하기에 시간적으로 부족하다는 의견을 제시함에 따라 수문방류 24시간전 사전 안내토록 '수문방류 예고제'를 도입, 시행하였다. '댐 홍수관리 소통회의'를 통해 댐 운영기관-정부기관-주민이 댐 운영에 대한 전반에 대해 함께 공유하고 운영 제약사항 및 개선사항을 공동 발굴하여 대책을 마련하는 체계를 구축하였다. 댐 운영 개선사항과 더불어 댐방류 의사결정시, 실시간 하류하천 상황에 대한 확인이 어려움에 따라, 3D기반 의사결정 지원시스템인 Digita Twin Platform을 개발 및 구축하여 '22년부터 섬진강댐 운영에 시범적용을 추진하고자 한다.

• Korean Journal of Construction Engineering and Management
• /
• v.16 no.2
• /
• pp.12-20
• /
• 2015

The public employers are faced the mounting importance of decision process to settle the optimum VE delivery system of such public facilities buildings and etc. The elements of decision process of the public employer are formed in the various relationships of the concerned and when the projects are coming into effect, the decision process in the VE delivery method and the selection of contractor will be the name of the game. The decision process in the VE delivery method and the selection of contractor are created a case to be one and the same as well as initiates a consistency for the performance. However, the function and role of the public employer are projective accordingly to the organization of employer and the employer especially no system is equal to the capability of perfect evaluation and verification of the ability of the employer. Especially the lowest bidder policy that started with justification to increase the competitiveness and technical capability of the contractors through the completion in between contractors has been providing the hotbed for insolvency, irregularity and irrationality as a result. From this point of view it is declared that the buildup the edifice of supporting system in the process of decision to recover the mutual trust and respect of the concerned in the VE delivery system with the technostress and the systematization based on drawing the elements which affect the decision process of public employer.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2023.05a
• /
• pp.224-224
• /
• 2023

국내·외로 Soil and Water Assessment Tool (SWAT) 모델은 유역 단위에서 유출 및 수질을 예측하는데 활용되고 있다. 하지만 SWAT 모델의 결과물은 데이터 테이블 형식으로만 이루어져 있기 때문에 모델 사용자가 유역 내 하천별 수문 모의 결과물을 직관적으로 확인하기 어렵다는 단점이 있다. 최근 다양한 분야에서 3D 가상환경을 구축하는데 디지털 트윈 기술의 활용성이 증가하고 있다. 디지털 트윈 기술은 현실의 공간을 가상환경으로 구축해 실시간 현실의 상황을 파악하여, 의사결정 지원을 제공한다는 장점이 있다. 이에 본 연구에서는 디지털 트윈 기술과 SWAT 모델을 연계하여, 모델의 결과값을 가상환경 3D 지도인 CESIUM에 실시간으로 표출할 수 있는 디지털 트윈 기반 SWAT 모델 수문 모의 시스템을 개발하였다. 이 시스템은 3D 지형에 SWAT 모델을 통해 모의 된 하천의 수위 및 SS에 대한 표출이 가능할 뿐만 아니라 기후나 유역환경에 따른 유역 내 수문 변화를 시·공간적으로 파악할 수 있는 장점이 있다. 향후 본 연구에서 개발된 디지털 트윈 기반 SWAT 모델 수문 모의 시스템은 홍수 및 가뭄과 같은 재해에 대응할 수 있는 유역 및 하천관리 대책을 효율적으로 수립하는데 활용될 수 있을 것으로 판단된다.

• Journal of Korean Society for Geospatial Information Science
• /
• v.10 no.2 s.20
• /
• pp.97-105
• /
• 2002

Nowadays the gas utilities has been increasing constantly due to the expansion of the urban areas. The gas utility companies have adopted GIS technologies and been trying to computerize the management system for gas facilities to maintain up-to-dated information to forecast possible accidents and to minimize the casualties from the accidents. The major objective of this study is to develop a GIS-based gas accident management system which could facilitate early response and alternatives in the cases of the accidents. The system is able to provide the information for the pipes to be closed followed by selecting the location of the accident, and search all the relevant values connected to the location to provide all the information to minimize the casualties. In addition to that, the system can calculated the remaining amount of the gas in the pipes closed from the accident thereby providing more safer alternatives. In the future, more practical method needs to be made such as GPS-linked more integrated gas accident management system.

• Korean Journal of Construction Engineering and Management
• /
• v.9 no.3
• /
• pp.126-135
• /
• 2008

The purpose of this study is to develop the efficient information system for managing owner's requirement(O/R) throughout the design phases. In order to derive an improvement, current status of O/R management both in domestic and foreign design company has been analyzed. Through the literature reviews and interviews with experts, the Information on design process and detailed activities were investigated. Based on the basic research, inputs, outputs and participants were defined and information flow diagram was drawn. O/R's were categorized according to comprehensive interviews with specialists, and a prototype system was suggested. Conducting systematized O/R management will improve the confidence of owners' role on design, reduce re-work in design tasks, and finally elevate design quality.

• Korean Journal of Construction Engineering and Management
• /
• v.8 no.2
• /
• pp.155-163
• /
• 2007

Multiple parties-owners, engineering and construction contractors, and suppliers involve the delivery process of capital facility projects in the construction industry, and each party obtains or provides their workforce, material, equipment, or service tied into specific contracts. Considering that construction projects are based on the contracted relationship between the parties and that contract types are one of the significant factors determining project success. it is critical for project stakeholder to select appropriate contract types for successful deliveries of projects. With these considerations, this paper assesses impacts of different contract types on project cost, schedule, safety, change, or rework. Analyzing data from real construction projects, the differences in project performance between two contract types, Cost Reimbursable and Lump Sum are measured and statistically tested to investigate if the differences are significant. For this analysis, performance metrics developed by Benchmarking and Metrics program, the Construction Industry Institute are used.

• Proceedings of the Korean Institute Of Construction Engineering and Management
• /
• autumn
• /
• pp.123-130
• /
• 2002

Project plan and control is a highly skilled task which is vital for business success, and Project control systems are important for successful project execution. To support construction process management effectively, an integrated cost and schedule control function is required to collect quality data in a timely manner and to provide quality historical data for future planning of new projects. In Korea construction industry, the development and implementation cases of a project control system which to efficiently support construction project planning and controlling processes, have been increased to ensure a project success and the profitability of a construction company. To contribute to improving practical effectiveness of a project control system, the paper reviewed and analyzed the current trends and functional features of current project control systems. And it also described the pending issues and their solutions faced on previous project control systems.

• Korean Journal of Construction Engineering and Management
• /
• v.5 no.1 s.17
• /
• pp.168-174
• /
• 2004

Project plan and control is a highly skilled task which is vital for business success, and Project control systems are important for successful project execution. To support construction process management effectively, an integrated cost and schedule control function is required to collect quality data in a timely manner and to provide quality historical data for future planning of new projects. In Korea construction industry, the development and implementation cases of a project control system which to efficiently support construction project planning and controlling processes, have been increased to ensure a project success and the profitability of a construction company. To contribute to improving practical effectiveness of a project control system, the paper reviewed and analyzed the current trends and functional features of current project control systems. And it also described the pending issues and their solutions faced on previous project control systems.