• 한국CDE학회논문집
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• 제11권3호
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• pp.223-233
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• 2006

Layered manufacturing(LM) is emerging as a new technology that enables the fabrication of three dimensional heterogeneous objects such as Multi-materials and Functionally Gradient Materials (FGMs). Among various types of heterogeneous objects, more attention has recently paid on the fabrication of FGMs because of their potentials in engineering applications. The necessary steps for LM fabrication of FGMs include representation and process planning of material information inside an FGM. This paper introduces a new process planning algorithm that takes into account the processing of material information. The detailed tasks are discretization (i.e., decomposition-based approximation of volume fraction), orientation (build direction selection), and adaptive slicing of heterogeneous objects. In particular, this paper focuses on the discretization process that converts all of the material information inside an FGM into material features like geometric features. It is thus possible to choose an optimal build direction among various pre-selected ones by approximately estimating build time. This is because total build time depends on the complexity of features. This discretization process also allows adaptive slicing of heterogeneous objects to minimize surface finish and material composition error. In addition, tool path planning can be simplified into fill pattern generation. Specific examples are shown to illustrate the overall procedure.

• 한국CDE학회지
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• 제3권2호
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• pp.34-40
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• 1997

• 교육녹색환경연구
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• 제9권1호
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• pp.32-40
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• 2010

The purpose of this study was to evaluate structural safety and economic efficiency of prestressed hybrid beam using T-shape steel member which was developed to build large span educational facilities. Hybrid beam specimens were manufactured with 16.0m long and load was uniformly distributed by 12.0kN steel hexahedrons. In this study, honeycomb beam design process was introduced to T-shape section steel beam design. Vibration condition of specimens were analyzed by Korea Building Code 2009 and AISC Steel Design Guide Series-11. As a result, the prestressed hybrid beam with T-shape steel member has about 10.4% of cost reduction effect.

• 경영과학
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• 제11권3호
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• pp.103-128
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• 1994

Due to the trend of evolution toward a broadband communication network with fiber-optics, the design and operation of fiber-optic network have been received a great deal of research attention recently. Furthermore, even a single fiber link failure in the network may result in severe service loss. Thus, the network survivability becomes an importantissue in planning and designing the network. This survey is on modelling of various fiber-optic subscriber loop network(FSLN) design problems, which are essential ones for providing broadband communication services and B-ISDN services. Models are classified and investigated as either conventional decomposition-iteration approach or integrated design method. To build survivable networks, SHR models are also suggested by ring control schemes. The result of this study will be effectively applied to build a design model for FSLN in the practical applications.

• 한국건축시공학회지
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• 제12권6호
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• pp.682-700
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• 2012

Over the last several years, Korea has increasingly adopted design-build for public construction projects. There is a much greater awareness of the need to change to a system based on 'Value for Money', which is high on the government's agenda. A whole life performance bid evaluation model is proposed to aid decision makers in the selection of a design-builder. This is based on the integration of a framework using an analytic hierarchy process, as the bid awarding system is being changed from one based on the lowest price to one based on best value over the life-cycle. Key criteria such as whole life cost, service life planning and design quality are important through the key stages of the evaluation process. The model uses a systematic and holistic approach, which enables the public sector client to make better decisions in design-builder selection, which will deliver whole life benefits based on long-term cost-effectiveness.

• 한국실내디자인학회논문집
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• 제21권5호
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• pp.200-207
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• 2012

This paper is analyzed the successful fundamentals of collaborative design management strategy from case of corporates such as, Louis Vuitton, H&M, MINI, Black Berry, Chanel, and Prada. Collaborative design management contributes creating cultural life and concurrently achieving corporate purpose through new vision and value creations which is a combination of rationality and originality as interacting design area and management area.In addition, collaborative design management has been emerged in order to create new business model in the rapidly changing modern society. It should be horizontal intercourse in order to increase social value and positive effects of each others to collaborative design management and play an important role in the new partner to build an effective business model. These case studies established the successful design strategy which is well structuring the systematic design network and efficiently managing the brand image from analyzing the user's needs and their life styles as an element of collaborative design management. This research is presented the mean of collaborative design management as a managing element to build a successful business model and proposed an appropriate application plan through the case studies.

• 대한토목학회논문집
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• 제33권6호
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• pp.2575-2582
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• 2013

공공건설공사 발주제도 운영에 있어 기술경쟁을 지향하는 턴키 및 대안방식 등 설계 시공일괄방식의 경우, 시설물의 품질향상 및 건설기술 발전에 기여하였음에도 불구, 계약되는 공사비가 설계 시공 분리발주방식을 적용하는 공사보다 높아 예산낭비 우려가 있다는 지적과 함께 수주독점, 입찰담합, 심의비리 등의 문제가 쟁점이 되고 있다. 그러나 실제 발주방식별 사업성과와 효과에 대해 정밀 비교분석한 사례가 없는 실정이며, 단순히 낙찰률 등 사업의 한정된 일반적 정보만으로 사업효과를 논의하고 판단하는 것은 자칫 오류를 범할 우려가 있다. 이에 공공 건설공사를 대상으로 계약에서 준공에 이르기까지 실제 집행한 공사비 자료를 광범위하게 조사하여 비용의 투입구조 및 변동추세 등 발주방식별 특성을 비교분석하고 공공건설공사 발주제도의 올바른 이해와 효율적 운영을 도모하고자 한다.

• 건축역사연구
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• 제15권1호
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• pp.7-27
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• 2006

This study aims to identify and analyze the factors that influenced the construction of London Eye which was led by private groups, including characteristics in progress, differentiated value in design, the combination of technology and design, and construction costs. The results of this study were the followings. 1) London Eye provides a new construction method for a landmark in the downtown in that the architects became the clients of the project which might have been hoarded, procuring the construction costs and completing it by themselves. 2) London Eye presents a space utilization method where undeveloped spaces in the downtown are used in three-dimensions by erecting a structure on the river with a minimum land. 3) The process of design, production and erection is propelled the realization of technical intention design with one system and from at the initial stage, the participation of the engineer where the designer is equal with you must accompany. 4) London Eye is endowed with strong shape by a circle in design concept, which is the simplest geometrical figure, and it provides organic relationship between the past and the present by utilizing historical elements in various ways. 5) The construction was completed through four phases including idea phase, promotion phase, turn-key contract phase, and design-build phase. The most critical factor to the success is derived from the direct contact with Involved companies from the production phase. 6) In a project facing many challenges in terms of technology, the design-build method proves to be a more effective method than turn-key contract in that it may more allocate risks and enable coherent implementation of the core concept in design. The organization for the design-build method was composed of three phases including general affairs, responsible contracting by sector, and cooperative system by sector. Since that was a new concept structure, high-level contractors who hadn't had existing cooperative relationships with one another formed new cooperative relationship, while collaborating companies who had long cooperated led the responsible contracting and sub-cooperative system, which resulted in reduction of risks and time. 7) The major factors to change design were the design characteristics, derived from a technically great combination, and the opening time. 8) A new erection method was applied to London Eye, a structure that overcame the limitation in land and period, and the process of installation demonstrated that it is an important value for the construction of a landmark in the city. 9) In spite of many visitors and tremendous operational income, the factors that London Eye fails to free itself from debts include the construction costs expended double than expected, and interest burden to the investments, which occurred in the course of procuring the costs. Absolute limit in time increased the construction costs, resulting in being a great obstacle in the course of operation.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1107-1112
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• 2009

To design and build a deformed building, new approaches and technologies are required, in which a design approach with parametric and generative technology is used for design and for building it, computer based fabrication technology. Even if parametric design technology is not a state of the art thing, the technology is still used widely, in order to effect the efficiency and furthermore it will continue to be innovated upon continuously. To cope with the limitation of it, the generative design system is developed. Deformed building design requires new methodology to overcome the limitations of conventional ways, which have difficulties to create enough design alternatives to explore satisfied design solutions order to deformed design have geometrical complexity and dramatically increased amount of data. Hence the generative design system can be a cutting edge methodology to solve it. However we should consider how to build the design in the real world. For this, the computer based fabrication technology which is used in mechanical industry is required to introduce to architecture and construction domain for efficiency. In this research, the methodology is modeled and tested with Bezier surface based shell structure.

• 한국건설관리학회논문집
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• 제24권5호
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• pp.44-51
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• 2023

프로젝트의 특성을 고려한 건설공사의 입찰방식 선정은 매우 중요한 요소이며, 발주자와 시공자 모두의 입장에서 공공건설공사에서 입찰방식의 이해는 그 중요성이 매우 크다. 설계시공일괄방식은 국내에서 흔히 턴키라 불리며 설계에 신기술을 적용할 수 있고 발주자의 리스크 관리가 용이하여 대형 공공건설공사에 많이 적용되는 입찰방식이다. 이 입찰방식에는 낙찰자 선정에 영향을 미치는 단 2개의 영향인자(설계점수, 가격점수)가 있어 각 영향인자 간 영향력에 대한 이해력이 중요함에도 불구하고 관련된 연구는 미흡한 실정이었다. 본 연구는 국내 공공공사의 다양한 입찰데이터를 분석하여 영향인자의 영향력을 분석하고 입찰전략 수립에 참고할 수 있는 근거를 제공하고자 한다. 연구 결과, 기술강조형, 가격강조형, 균등평가형 이 세가지 가중치 평가방식 모두 입찰자평가 순위에 더 많은 영향을 주는 요소는 설계점수인 것으로 나타났다. 또한 계약금액의 조정이 용이하지 않은 입찰방식 자체의 특징 및 총점 차등제 등 입찰평가구조로 인해 설계점수와 가격점수 간 상관관계는 크게 나타나지 않음을 확인할 수 있었다.