• Korean Journal of Construction Engineering and Management
• /
• v.15 no.1
• /
• pp.3-10
• /
• 2014

High-rise buildings need thorough cost management because of large size and high risk. Cost management makes a budget by establishing and analyzing detail element at planning phase, needs cost control as each design phase, then reflected to next design. This research develops a schematic estimation model based on vertical and horizontal elements at design phase for structure cost of high-rise buildings to reduce error range and use data as design management. Usability of the model is confirmed by case study. The estimation model is expected to contribute to making the cost model more effective and satisfactory to concerned in construction or budget department and manage keeping track of the cost.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.34 no.8
• /
• pp.1097-1103
• /
• 2010

Injection pressure, an important factor in the filling procedure, should be minimized to enhance injection molding quality. In addition, warping deformation and weld lines, which are representative failures, should be avoided to enhance injection molding quality. To improve injection molding quality, the design procedure for an automotive fog blank cover is divided into two stages. In the first stage, we optimally obtain injection molding process variables that minimize injection pressure and warping deformation by using design of experiments, approximation and optimization techniques equipped in PIAnO (Process Integration, Automation and Optimization), a commercial PIDO (Process Integration and Design Optimization) tool. Then, we determine the thickness of the automotive fog blank cover that enables us to avoid generating weld lines. The design results we obtain in this study are found far better than those of the initial design, which demonstrates the effectiveness of our design method.

• Proceedings of the Korean Nuclear Society Conference
• /
• 1997.05a
• /
• pp.207-212
• /
• 1997

영광2호기에 설치되어있는 노내 중성자속 감시 계통 설비인 기계식 인출제한 스위치(Withdrawl Limit Switch)의 구조적인 결함을 제거하기 위한 원인 분석 및 개선과정에 중점을 두었다. 기계제어방식의 구조적 결함은 검출기(Detector)가 노심의 중성자속(Neutron Flux)을 측정하기 위해 구동기의 수동 혹은 자동운전시 검출기 안내관에 삽입 인출이 반복 수행되면서 물리적 또는 환경적요인에 의한 레버의 휘어짐으로 접촉위치의 변경이 발생하는 것을 의미한다. 콘솔내 다수의 마이크로-프로세서(Multiple-Microprocessors)에 의한 구동기(Drive Unit) 동작으로 노심내 3차원 중성자속 분포를 측정할 수 있는 유일할 설비로써 본 계통은 그동안 관련 보수작업 및 설비개선에도 불구하고 근본문제점이 해소되지 못한 가운데 여러차례의 설계, 모의시험을 거쳐 인출제한스위치 제어 방식을 기계식에서 전자식으로 개선, 대체하여 시험 및 운전해 본 결과 근본적 결함원인이 해결되었음을 확인하였다.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2003.11a
• /
• pp.246-251
• /
• 2003

공급체인관리는 개별적 기업 에이전트(마케팅, 자재, 구매, 생산, 유통등)를 통합하여 운용하도록 하는데, 이러한 통합은 한 기업에서 국한되는 것이 아니라 공급자로부터 소비자까지의 공급체인의 모든 에이전트에게 적용된다. 공급체인의 에이전트들 간의 통합이 실질적으로 효과를 나타내기 위해서는 상호 정보 공유 및 조정된 방법으로 운영되어야 한다. 전자거래에 대한 요구가 증대되면서 새로운 변화에 유연하게 대처하고 예측하지 못했던 상황, 즉 Order에 대한 주문량 변경/취소, 새로운 고객 등장(긴급을 요구하는 Project등)으로 새로운 Order 생성, 계절적 요인으로 인한 주문량 폭주, Event에 의한 특정 상품에 대한 Cost Down 및 Cost 복원, 원자재/제품의 불량처리에 대한 Delivery 일정 수정 등과 같은 사건에 능동적으로 대처할 수 있도록 공급체인 내에서 Intelligent 기능을 가진 Coordination Agent의 도입이 요구되고 있다. 따라서 본 연구에서는 전자거래와 공급체인을 연계한 e-SCM에서의 조정 에이전트 시스템을 구현하고 Agent의 Coordination 능력을 분석한다.

• Journal of Korea Water Resources Association
• /
• v.30 no.1
• /
• pp.15-22
• /
• 1997

The flow in meandering channel has a great influence on curved bank revetment in river morphology. It is difficult to state generalized cirteria for channel improvement applicable to any paricular river. But it is very important to provide some principles and guidelines for design engineers. The objective of this experimental study in fixed bed model is to povide effective data that find out maximum velocity size by the mean velocity and the radius of curvature in curved channel, for the purpose of improving small stream without hydraulic modeling test each time.

• Proceedings of the Korea Society for Industrial Systems Conference
• /
• 1998.03a
• /
• pp.199-203
• /
• 1998

활동정보회계시스템은 전통적인 복식부기시스템을 개선·보완하기 위해 도입된 것으로 사용자들이 쉽게 이용할 수 있고(user friendly), 직접 자사의 업종에 적합한 회계시스템을 구축할 수 있는 기본적인 툴(basic tool)를 제공해준다. 전통적으로 전산회계시스템은 개발에 막대한 비용이 투입될 뿐만 아니라 이미 개발된 시스템도 환경적인 요인이 변화되면 사용하기 어렵거나, 유지보수가 매우 어렵다는 단점을 가지고 있다. 그러나 활동정보회계시스템은 이러한 단점을 극복할 수 있도록 해준다. 예컨대 , 이 시스템은 회계상의 거래를 처리할 때 반드시 준수해야 하는 일반적으로 인정된 회계원칙인 기업회계기준이 개정되었다고 하더라도 큰 제약을 받지 않고 곧바로 시스템의 내용을 이용자들이 손쉽게 변경할 수 있도록 설계되어 있다. 본 논문에서는 활동정보회계시스템이 모든업종(영리단체와 비영리단체)에 적용될 수 있음을 제시하여 ,매우 유연성이 높은 시스템을 입증하고자 한다.

• Korean Journal of Construction Engineering and Management
• /
• v.14 no.3
• /
• pp.146-156
• /
• 2013

Recently, to reflect the various needs of customers in the apartment field, the customized apartment has emerged. From the point of the customer, customized apartments have the definite advantage of being able to guarantee more customer options. On the other hand, from the point of the project manager, there are significant risk factors, with increase of management factors, construction delays, etc. The reasons for this are, to date, the insufficient systematic analysis of the project, and the lack of experience of similar projects. This study provides the waste factors of each phase in a customized apartment project. A survey and interview are conducted to achieve the waste factors using MUDA methodology; a process of the project was analyzed; and a factor of each process was identified. Also, AHP(Analytic Hierarchy Process) are used, to evaluate the waste factors in project stages. The AHP results show that "Design change" and "Inappropriate intervention in construction process" ranked highly in the waste factors. The results of our research will provide a countermeasure that addresses waste factors in similar projects, and contributes to reducing the extra cost and time in new projects.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.30 no.7B
• /
• pp.450-463
• /
• 2005

This paper aims to find influencing factors for firms to adopt network equipments which based on Advanced Telecom Computing Architecture (ATCA). ATCA suggests a standardized specification for telecom equipments design. This new paradigm of developing network equipment provides benefits for network equipment manufacturers by reducing development time for new equipments with lower CapEx and OpEx. It also deliver oportunities for telecom services providers to exploit or test new services by replacing or upgrading part of total system with modular based network equipments. The research model basically depends on various researches based on Rogers' Innovation and Diffusion theory and it is verified through an empirical study for ninety-one domestic forms. Binary logistic regression was conducted to find the relationship between purchase intention and factors affecting new technology adoption. As a result, two factors such as scalability and cost/benefit effectiveness of the new system were statistically significant. Cluster analysis followed with those two variables. This helps TEMs (Telecom Equipments Manufacturers) get some implications on timing and target customers for diffusing the ATCA based technologies in the market.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2008.04a
• /
• pp.161-164
• /
• 2008

In recent years, carbon fiber-reinforced polymer (CFRP) has been widely used for repairing and/or strengthening structural elements in concrete. Not enough test data, however, are available to predict the long-term performance of the repaired and improved structures exposed to weathering. The objective of this research is to study the effect of freeze-thaw cycling on the behavior of reinforced concrete (RC) beams strengthened in shear with carbon fiber sheet. Six small-scale RC beams (100mm${\times]$100mm${\times]$400mm) were strengthened with CFRP in shear, subjected to up to 400 cycles freeze-thawing from -17${\sim}4^{\circ}C$, and tested to failure in four-point bending. Test result, there was no significant damage to carbon fiber sheet strengthened concrete beams had been suffered 30 cycles of freeze-thawing, and more over 60 cycles of freezing-thawing brought about a reduction in resistance of only 25% of the initial level.

• Journal of the Korea Institute of Building Construction
• /
• v.13 no.3
• /
• pp.263-271
• /
• 2013

Change orders have been widespread in both the private and public construction sectors. In particular, in the case of G2B (Government to Business) contracts, adjustment of contract price and/or schedule extension is a frequent occurrence due to change orders. To uncover the causes of change orders and suggest an appropriate strategy, this study analyzed 296 cases of change orders in military facility construction projects from 2008 to 2010. The analysis revealed that the major causes of change orders are users' additional requirements (28.38%), a change of finishing materials (23.99%), and change of footing type (17.57%), in that order. Building on the results of this analysis, the authors suggest plans for practical improvements. Specific recommendations include 1) reflect user requirements at the early stage, 2) minimize the use of additional budget due to change orders, and 3) reduce the process and time for contract amendment, among others. The results of this study may provide significant implications to those involved in military construction projects, particularly project owners (i.e., the Ministry of Defense) and contractors.