• 방사성폐기물학회지
• /
• 제8권1호
• /
• pp.9-17
• /
• 2010

액체카드뮴음극(LCC, Liquid Cadmium Cathode)을 사용하여 우라늄과 TRU (TRans Uranium) 원소를 동시에 회수하는 전해제련공정에서 LCC 표면에서 성장하는 수지상(dendrite) 우라늄의 생성 및 성장을 억제하기 위한 LCC 구조는 개발은 전해제련공정의 핵심이다. 금속 수지상의 생성과 성장 현상을 관찰하기 위해 상온에서 실험이 가능하며 육안관찰이 가능한 Zn-Ga 계의 모의실험장치를 제작하였으며 갈륨 계면에서의 수지상 아연의 성장 현상과 기존의 교반기형과 파운더형 LCC 구조의 성능을 관찰하였다. 이러한 금속 수지상은 전해용액 내에서 그 기계적 강도가 약한 것으로 보여 여러 가지 음극 구조에 의해 쉽게 파쇄 되지만 액체금속으로 쉽게 가라앉지는 않았다. 모의 실험결과를 바탕으로, LCC 구조개발에 활용할 수 있는 실험실 규모의 액체음극 전해제련 실험 장치를 제작하였으며, 수지상 우라늄의 성장 억제를 위한 여러 가지 형태의 LCC 구조의 성능 시험을 수행하였다. 교반기형 LCC 구조의 실험결과 LCC 도가니 내벽에서 성장하는 수지상 우라늄을 효과적으로 파쇄하지 못하였으며, 일자형과 harrow형 LCC 구조의 성능은 유사하였다. 이에 따라 LCC 표면과 도가니 내벽에서 성장하는 수지상 우라늄을 LCC 도가니 바닥으로 침전시키기 위하여 mesh형 LCC 구조를 개발하였다. 이의 성능실험결과 수지상 우라늄의 성장 없이 약 5 wt%까지의 우라늄을 회수할 수 있었다. 실험 종료 후 LCC 바닥 침전물을 화학 분석한 결과 금속간화합물(UCd11)이 형성되었음을 확인할 수 있었다.

• 한국건설관리학회:학술대회논문집
• /
• 한국건설관리학회 2003년도 학술대회지
• /
• pp.469-472
• /
• 2003

수도건설사업은 공용이후단계에서 소요되는 운영${\cdot}$유지관리비용 중에서 기계설비 및 관로시설이 대부분을 차지하는 대표적인 플랜트시설로 구성되므로 일반적인 토목시설물의 LCC모델과 차별화되어야 할 것이다. 따라서 본 연구에서는 수도건설사업에 적합하도록 비용분류구조를 제시하고 이에 따라 수도시설 LCC분석 모델을 개발하였다. 설계VE 활동시 기초가 되는 설계VA의 절차를 실무활용도 측면을 고려하여 개선된 설계VA절차를 제시하였다. 제시된 설계VA 절차와 LCC분석모델을 사용하여 실제 건설사업의 설계VE활동에 있어 송수관로의 적정 선형 선정에 적용하였다. 제안된 수도건설사업의 설계VA모델은 향후 수도건설사업의 경제적${\cdot}$가치혁신적 대안선정과 유지관리비 예산 추정 및 적정예산 배정에 매우 유용하게 활용될 수 있을 것이다.

• 한국건설관리학회:학술대회논문집
• /
• 한국건설관리학회 2003년도 학술대회지
• /
• pp.477-480
• /
• 2003

기존의 재건축 안전진단의 비용분석은 정량적이지 못한 평가기준과 방법 등 많은 문제점을 가지고 있어 좀더 효율적으로 안전진단 업무를 수행하고, 비용분석 결과의 신뢰성을 향상시키기 위해서는 체계적인 비용분석 절차 및 기준이 필요하다. 따라서 본 연구에서는 각 비용항목들을 정량적으로 도출${\cdot}$산정하고, 효율적으로 비용분석을 수행하기 위한 절차 및 기준을 제시하고자 한다. 재건축 안전진단의 비용분석은 먼저, 내용연수, 실질이자율 등의 기본사항을 결정하고, 구조체 보수${\cdot}$보강비용, 건축 마감 및 설비 성능회복비용, 철거비, 이주비, 유지관리비용 등의 개${\cdot}$보수 비용 및 재건축 비용을 산정하여 이들 비용의 LCC 년가를 비교하여 분석${\cdot}$평가한다.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2011년도 춘계학술대회 논문집
• /
• pp.1134-1141
• /
• 2011

Costs have long since become a major issue in railway system analysis, attention is not limited to the acquisition costs alone, but encompasses all costs involved in the use and disposal of the systems. Concepts such as Life Cycle Cost(LCC), Costs Of Ownership(COO), or Total Ownership Cost(TOC) are more and more frequent in any document dealing with system analysis. Most of railway projects have applied this LCC Model to evaluate effectiveness of system acquisition cost. But these action of LCC model does not applied all the rest of system life cycle period due to the differences of its responsibility. This is why a study has been undertaken by the operation party to harmonize the most important aspects of the LCC model. This study focused on these and other objectives for introduction of method and needs for an action plan for maintenance actions involved relevant cost allocation.

• 산업공학
• /
• 제18권4호
• /
• pp.477-484
• /
• 2005

This paper is concerned with the life-cycle cost(LCC) of the urban transit system which was developed by KRRI and is now under test in Gyeongsan, Korea. Its reliability, availability and maintainability(RAM) were analyzed. LCC is the core part of analyzing the total cost of acquisition and ownership of a system. LCC analysis of a system is the most effective when it is applied in the it's early design phase. In this paper, we present IEC 60300-3-3(Life Cycle Costing) in detail and propose how to apply LCC in assessing the urban transit system according to RAM process. This case study demonstrates that reliability management system is very effective in reducing the operating cost of subway corporations in Korea.

• 산업경영시스템학회지
• /
• 제18권34호
• /
• pp.173-183
• /
• 1995

Life cycle cost has been one of the key criteria in design or purchasing of systems, particularly in the flying weapon system. Unexpected cost increase or system breakdown during the system life can be reduced by controlling maintenance cost A system should be designed for maintainability in early stage of product life cycle. The design should be insensitive to its environmental, organizational, and human factors in the stage of customer's utilization. This paper presents LCC as a controllable variable and also suggests a new control model for LCC analysis. The estimation of maintenance cost based upon maintenance scenario, design of maintainability followed by minimizing maintainability loss function in the beginning stage of design, and increase of useful life of systems are among the factors to control LCC.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2009년도 춘계학술대회 논문집
• /
• pp.177-183
• /
• 2009

This paper deals with the topical problems of the Life Cycle Costs in connection with the rolling stocks. the LCC philosophy has already entered the third decade. this philosophy contributed towards the new relationship's comprehension between railway vehicle producers' and railway vehicle users' sphere. this leads together to the technical-economical solution convenient for the both sides. In the point of manufacturer, It is said that low operational costs could be reached using a well-designed and structured maintenance program. this is due to the proper technical analysis of critical components that leads to low costs of maintenance and a superior reliability without increasing the capital investment. but, This paper presents both topical experiences with the LCC models for the railways vehicles and also procedures during Life Cycle Costs calculations. In conclusion I want to introduce how to calculate LCC & what kinds of softwares are used based on VVVF EMU vehicle

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2008년도 동계학술발표대회 논문집
• /
• pp.481-486
• /
• 2008

The building HVAC systems have very different qualities of performance and durability with the superintendent's ability for management and maintenance. The poor management of these systems finally lead to the shortening of the life expectancy and result in the increase of operating costs and energy consumptions due to low efficiencies. So it is essential to try to develop ways to adequately maintain and to use the building facilities efficiently in order to preserve earth environment and the limited resource. In this study, the LCC based numerical calculation package will be developed for the efficient maintenance plan and the determination of the reasonable time of repair or replacement of equipments.

• 한국지진공학회:학술대회논문집
• /
• 한국지진공학회 2003년도 추계 학술발표회논문집
• /
• pp.344-351
• /
• 2003

In order to consider the characteristics of nonlinear dynamic responses of seismic isolated bridges reasonably, piers and isolators are modeled as a 2-DOF bilinear system. Then nonlinear time-history earthquake response analysis is accomplished many artificial input ground motions which were generated to reflect the characteristics of earthquakes. Damage probabilities and failure probabilities of each structural elements of the brides are calculated by using Monte-Carlo simulation method. Based on LCC evaluation considering various cost items of direct/indirect damage costs, the optimal design method of seismic isolated bridges is proposed. By using a sensitivity analysis about the design variables and a cost effectiveness evaluation in the viewpoint of LCC, the validity and the adequacy of proposed optimal design method are verified.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2007년도 추계학술대회 논문집
• /
• pp.777-783
• /
• 2007

Life cycle costing is one of the most effective cost approaches when we choose a solution from series of alternative so the least long-term cost ownership is achieved. Life cycle costing in railway industry has been focused on the prediction of investment for railway vehicles. But in today, the life cycle cost, LCC, prediction on the aspect of operation and maintenance cost through whole life cycle is highly necessary. In this paper, we present a strategy for the development of life cycle cost estimation software on the aspect of maintenance strategies of railway vehicle. For this purpose, we suggested a structure of LCC software based on the UNIFE LCC model. And we developed a pilot version of software to evaluate the LCC model that we suggested for railway vehicle. We performed LCC analysis on the brake module of metro vehicle in case study and concluded that the software and model developed in this research could enough to support engineers in choosing better cost effective solutions from many alternatives.