• Journal of the Korean Society for Railway
• /
• v.14 no.1
• /
• pp.31-38
• /
• 2011

Turnkey and alternative-design contracts was introduced operation in the country from january 2004 to February 2010. this was introduced operation. The selecting method of contractor for turnkey projects has being operated by an open forum type that consists of technical committee and appraisal committee in an integrated design approach deliberations. But to improve the operation of the problems, the government is operating design review committee consisting of the central, local and special design advisory committee in march 2010. But this system has also been suggested as still problems, too many contracts by large companies, increasing of design cost and excessive competition. This study is intended to contribute that turnkey and alternative-design contracts can be well operated in domestic construction markets. In this paper suggests some improvement methods and operational problems caused from application of an open forum type for selecting contractor of turnkey project.

• Journal of Korean Society of Steel Construction
• /
• v.19 no.1
• /
• pp.29-41
• /
• 2007

Structural design, like other complex decision problems, involves many trade-offs among competing criteria. Although mathematical programming models are becoming increasingly realistic, they often have design limitations, that is, there are often relevant issues that cannot be easily captured. From the understanding of these limitations, a decision-support system is developed that can generate some useful alternatives as well as a single optimum value in the optimization of steel frame structures. The alternatives produced using this system are "good" with respect to modeled objectives, and yet are "different," and are often better, with respect to interesting objectives not present in the model. In this study, we created a decision-support system for designing the most cost-effective moment-resisting steel frame structures for resisting lateral loads without compromising overall stability. The proposed approach considers the cost of steel products and the cost of connections within the design process. This system makes use of an optimization formulation, which was modified to generate alternatives of optimum value, which is the result of the trade-off between the number of moment connections and total cost. This trade-off was achieved by reducing the number of moment connections and rearranging them, using the combination of analysis based on the LRFD code and optimization scheme based on genetic algorithms. To evaluate the usefulness of this system, the alternatives were examined with respect to various design aspects.

• Korean Journal of Construction Engineering and Management
• /
• v.23 no.5
• /
• pp.98-107
• /
• 2022

The purpose of this study is to suggest a model for evaluation of a risk based value index for modular design alternatives in plant construction projects. Accordingly, 1) Setting the basic project cost and the scope to apply the module, 2) Evaluating the importance, easiness, and effectiveness index for Engineering, Procurement, Fabrication, transportation, and construction work, 3) Estimating the total project cost by analyzing the risk reserve Step, 4) Comparing the effectiveness index and total project cost for each modular design alternative, it was composed of the steps of deriving RVI. To verify such a model, Plan-A, which applied a module to one process, and Plan-B, which applied a module to three processes, were composed to evaluate RVI.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.32 no.6A
• /
• pp.355-367
• /
• 2012

Many of old aqueduct bridges located in rural areas are in need of repair and redesign. They still occupy some portion of countryside landscaping. However, most of them were designed to fulfill their basic functions of carrying waters, which has not contributed to the landscape positively. Moreover, it is not rational to treat each design case of aqueduct bridges individually because they are relatively small in size and arranged continuously over a long path. Therefore, it is better to provide a design guideline to repair or to redesign old aqueduct bridges as a whole considering both structural safety and landscape. The main objective is to develop a framework to repair and redesign of old aqueduct bridges for safety improvement and better landscape. Specifically this paper will address the development of possible design alternatives for repair and redesign The development of design alternatives for redesign will follow general principle of bridge aesthetics and be represented according to structural system, flume shape, pier height, pier shape in terms of design parameters while minor repair includes paintings and other ornamentations. And the developed design alternatives will be reviewed with its landscape as a background to check the visual compatibility within the community context. It is expected that the proposed guideline will be utilized to develop a maintenance plan to revitalize old aqueduct bridges to improve overall landscape of rural areas.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2010.05a
• /
• pp.202-212
• /
• 2010

하천복원설계 절차에 따라 현상태의 유역통합관리 대안 적용 전후에 대한 수리학적 특성을 저수량과 평수량에 대해 HEC-RAS 모형과 RMA2 모형을 이용하여 분석하였으며, 기본적인 수리모형의 계산결과를 바탕으로 목감천 하천설계 구간 4.5 km에 대해 하천의 수리 수문학적 분석을 수행하였다. 그리고 목감천에서의 지배유량을 산정하여 Rosgen의 하천분류법에 의해 하천형태를 분류한 후 경험식에 의한 하천복원설계를 수행하였다. 즉, 하천형태의 분류에 따라 하도 평면형 결정 및 하상경사 예측, 경험식에 의한 하도 단면 및 하상경사의 결정, 사행파장에 의한 여울의 위치를 각각 결정하였다. 목감천 하천복원 설계를 위한 구체적인 상세설계안을 마련하기 위하여 하천복원설계에 필요한 하도 평면형, 하도 종단형, 하도 단면형을 결정하였으며, 상세 설계의 기초자료로 활용한다.

• Journal of the Korean Institute of Educational Facilities
• /
• v.12 no.4
• /
• pp.77-84
• /
• 2005

• Journal of the Korean Society for Railway
• /
• v.14 no.6
• /
• pp.489-494
• /
• 2011

In this paper, a method is proposed to evaluate a number of alternatives for light-weight rolling stock recommended from experts in rolling stock and to decide an optimal alternative. At first, many customer needs from various fields in railroad are drawn and weights of customer needs are decided by AHP. Secondly, technical requirements that should be real specifications for light-weight rolling stock are set and weights of technical requirements are decided by QFD. Finally, we evaluate some proposed alternatives and conclude an optimal alternative of light-weight rolling stock with TOPSIS.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.33 no.2
• /
• pp.771-780
• /
• 2013

Inspection system which was performed in the past selected the final winning bidder by separating Pre-Qualification, the basic design evaluation and price evaluation. However, turnkey and alternative bidding construction has selected way to determine the successful bidder as the best design and the most low cost method, comprehensive evaluation method (bid price adjustment, design score adjustments, weights standard), the best design and the fixed amount method from january 1, 2010 to the present. Due to these institutional problems, orders institutions were often a way to determine the successful bidder to apply differently for identical or similar construction. Therefore this study winning bidder selection criteria through analysis of construction the number and construction order performance, order performance by work division and institutional orders, the weights bidder order performance and orders status of turnkey alternative tendering construction to civil part performed in domestic.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.15 no.2
• /
• pp.725-734
• /
• 2014

Modernization projects are actively underway to replace conventional logistics equipment for the development of the 21st century logistics management system. The modernized logistics system is expected to expand to each troops on future. In this paper, we deal with simulation of automated logistics center to analyse the current system. Especially, the alternative to the same scale is designed based on needs of military distinctiveness. As a result, it can be effectively compared the current system. The result obtained in this design process is comprehensively analyzed by the AHP(Analytic Hierarchy Process). The proposed method in this study is allowed to cost-effectively evaluate current and future automated logistics center. And, that is expected to contribute to modernization projects of the military logistics system.

• Journal of Intelligence and Information Systems
• /
• v.12 no.4
• /
• pp.91-107
• /
• 2006

This study introduces a software system for supporting the engineering process of container terminals. The design procedure consists of data input, capacity requirements, alternative design, alternative evaluation, and results output. In order to design and evaluate alternatives rapidly, a set of libraries for container terminals was developed. The libraries consist of Wharf, Yard, TravellingArea, and Gate. The architecture of the set of libraries was designed by an object-oriented approach. Various types of container terminal models can be constructed by using a user friendly interface, the CAD based environment, and the combinations of the elements of the libraries. Alternative models can be evaluated by a simulation.