• Korean Journal of Construction Engineering and Management
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• v.15 no.6
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• pp.26-34
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• 2014

Highway construction is a combination of linear, repetitive, and highly equipment intensive operations. Various types of construction equipment are deployed to ensure undisrupted performance of construction, and thus productivity improvement and cost-saving can be achieved through well-thought-out planning. The selection of construction equipment is dependent upon construction sequence, site conditions, and construction methods. In the process of planning, management should consider various types of construction methods per each type of construction operation. Also, management should map out proper construction equipment operation plan that takes the construction duration and cost measures into consideration. However, limited availability of historic data from the similar types of operations has been a stumbling block to proper construction planning, making the operations performed based upon experience and intuition guided by rules-of-thumb. As a consequence, the planing phase rarely provided an adequate validity in the implementation phase. The researchers developed a process logic for each construction type that management can utilize from early phase of highway construction planning process. Moreover, derived the construction equipment combination optimized for efficiency by using the process simulation technique. The developed method is expected to be useful for the decision-making process that aims to evaluate efficiency of various process plans and to ensure optimal selection of construction equipment for highway construction projects.

• Journal of the Korean Operations Research and Management Science Society
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• v.20 no.2
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• pp.11-22
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• 1995

kanban 시스템의 초기 Kanban 갯수 결정문제는 Kanban 시스템의 최적 운영 문네 준 하나이다. 생산 공정 구조가 일반 형태를 같는 Kanban 시스템에서는 초기 최적 Kanban 갯수 결정 문제는 수학적으로는 정수계획법으로 모델화 되기 때문에 발견적 해법으로는 가능해만 제시해 줄 수 있다. 실제 Kanban 시스템을 사용하는 현장에서는 대부분 경험적으로 초기 Kanban 갯수를 결정한다. 본 논문에서는 현장 경험을 이용하여 각 생산 단계 사이에 생산걍, 재고, 고갈이 Kanban 갯수에 따라 관계성을 찾을 수 있다면, 일반 생산 형태를 갖는 Kanban 시스템에 Kanban 갯수함수를 적용하여 초기 Kanban 갯수 결정하는 개법을 제시했다.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.597-600
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• 2008

Recently, Several Mega project are been performing as a multi-dimensional development project in Korea, but some problem has been revealed about deficiency of the history, experience, and skill. A multi-dimensional development project require the technology which can manage mega project to its specific at the level of program management. predicting schedule and schedule management are the most important for mega project, been performing over several years. This research shows the method of predicting and planning schedule in the early stage as a pre-study on developing a technology of schedule management. First of all, it presents the development of database considering the specific of mega project that can accumulate the history of schedule and search the schedule according to the type of single and multi building. Also it suggests the method of prediction schedule by creating scenarios according to owner requirements and cash flow, affecting schedule management in the early stage, and the shortening possibility of schedule duration using CCPM theory.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.05a
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• pp.53-59
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• 2003

제조업 경쟁력 확보의 일환으로 최근 들어 각 기업에서 정보 기술의 활용이 급격히 증가하고 있는데 이 중에서 특히 제품 설계 단계에서는 PDM 시스템이, 생산 단계에서는 ERP 시스템이 널리 사용되고 있다. 제품 수명 주기의 초기 단계인 설계 단계에서 생성되거나 사용되는 많은 종류의 데이터는 생산 단계에서도 똑같이 사용되기 때문에 PDM 시스템과 ERP 시스템 간의 원활한 데이터 흐름은 전체 생산성 향상에 필수적인 요소라 하겠다. 본 연구에서는 PDM/ERP 시스템 간의 원활한 데이터 연동 환경을 개발하기 위래 연동대상 데이터 분석을 통해 필요한 기능적 요구사항을 도출하고 이를 공정 계획 시스템을 기반 구조로 하는 시스템으로 구현하고 항공기생산 과정에 적용하였다. 이러한 개발을 통해 공정 계획 작업 기간이 단축되고 데이터 정확도가 향상되는 효과를 볼 수 있었다.

• 월간 기계설비
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• no.10 s.219
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• pp.48-50
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• 2008

해외건설공사를 성공적으로 수행하기위해서는, 낙찰통보전 낙찰가능시점부터, 현장소장을 비롯한 현장준비팀을 조직 운영하여, 계약서류상의 각종 요구사항, 승인사항, 인 허가사항, 현지법,공법,계약조건, 공정계획, 인원소요계획, 장비소요계획 등을 검토 한다. 또 현장답사 등을 통하여 견적시에 계획되고 작성된 모든 내용을 검토 보완, 수정 및 Update함과 동시에,선발대를 현장에 투입해 발주자로부터 현장을 인수하고 가설공사를 시작하며 조기착공에 서두른다. 단, 현장투입 전 발주자로부터 접수한 Letter of Intent(낙찰/계약의향서)상의 착공관련 조건을 확인하거나 Notice to Proceed(착공지시서)의 접수를 확인해야 한다. 시공자의 입장에서 건설공사의 궁극적인 목표를 이익의 극대화로 볼 때, 공사초기에서의 신속한 동원이야말로 목표달성에 이르는 지름길이며, 발주자 및 감리자로부터 신뢰를 받아 공사 전반에 걸쳐 순조로운 현장운영을 가능케 하는 것이다.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.426-429
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• 2003

In the construction process, there are many change orders differing to the initial contracts came from the social needs and environmental changes. Most of them will impact to the construction process so that its effects occur project delays. Time extension and liquidated damage in the construction process come from schedule delay whether it is excusable or not non-excusable by the owner. However, those become the delay claims if the owner and the contractor are not agreed on this situation. One of the most important thing on the delay claims is the calculation of delay. The purpose of this study is to present the method of the time delay calculation by comparison of As-Planned schedule, As-Built schedule including all delay and As-Built schedule absent owner delay.

• Journal of the Society of Disaster Information
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• v.9 no.2
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• pp.195-205
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• 2013

Construction Management means a comprehensive plan of given the resources and the operation of the elements to complete the construction within the construction period. The construction period of these shall be determined by calculation based on reliable initial business. However, in actual field, inaccurate task duration is determined to the intuitive judgments of representative, reference of a similar project construction period of the past. As previous studies for the improvement of existing methods, This study presented a standard model that can be utilized in the early stages of construction projects for the TBM method operating by diameter (2.6m, 3.0m, 3.5m, 5.0m, 8.0m), and This study presented and calculated construction period which can estimated quickly the entire outline the construction period Therefore, When performing TBM construction work in the future, the total construction period which presented and analyze by TBM diameter, can be used as a useful material which plan and manage construction contracts, construction estimating, construction planning to the basic planning stage, and the basic design stage.

• Korean Journal of Construction Engineering and Management
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• v.20 no.6
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• pp.98-106
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• 2019

Recently, the number of project delay-related claims and disputes in Korean construction projects has been increasing rapidly. This suggests that the domestic construction contract practice, which has traditionally been superior to the client, is changing into a mutually balanced relationship among the contracting parties. The project delay analysis selects the application method according to the type of schedule approved at the start of the construction and how the schedule management was performed during the construction. The most important prerequisite for project delay analysis is that a complete CPM schedule agreed at the beginning of the construction is prepared and the actual progress of such schedule is well documented. This study is about applying the project delay analysis methodology of a case where a contractor claims damages to a client while constructing a large new private building construction project. In this study, it is determined whether the application of the as-planned analysis method is appropriate to the incomplete CPM schedule and then proposes the as-planned vs. as-built analysis method based on the new standard as an alternative. Next, apply the as-planned vs. as-built analysis method to the schedule in the case project, and then compare it with the result of the as-planned analysis method. The purpose of this study is to suggest a project delay analysis method suitable for the domestic schedule management practices, so that it can be used as a meaningful reference in project delay disputes and litigations of domestic construction projects.

• Proceedings of the Korean Fiber Society Conference
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• 2001.10a
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• pp.67-70
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• 2001

양모를 염색할 때 부딪치는 문제점 중 하나는 산성염료의 빠른 초기염착으로 인한 불균염의 발생으로, 이는 이미 섬유표면에 염착된 염료가 미염착된 염료의 결합을 방해하여 불균염이 발생하게 된다. 따라서 불균염을 막기 위해 초기 염착속도를 늦춰주는 과정이 필요하게 되는데, 이를 위하여 균염제라고 불리우는 계면활성제를 사용하고 있다. (중략)

• Journal of the Korean Society for Precision Engineering
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• v.14 no.3
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• pp.114-121
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• 1997

In this paper, the automated initial process planning for 3-axis NC machining of sculptured surfaces is persented. The solution algorithms determining three process planning functions, i.e. machining feasibility, setup orientation and feasible machine selection are developed. The machining feasibility is determined by means of BSM(Binary Spherical Map) which derives its solution quickly in algebraic form, and the setup orientation is determined so that the cutting force is minimized. Finally, the feasible machine is determined by computing the minimum motion ranges of each control axisl. The developed algorithms are tested by numerical simulations, convincing they can by readily implemented on the CAD/CAM system as a process planner.