• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.347-350
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• 2008

유지보수 활동이 전체 프로젝트의 중요한 비중을 차지하면서 유지보수를 수행하기 위한 비용의 증가가 이루어져 왔다. 하지만 유지보수를 수행하고 관리하는데 사용되는 지표나 지침, 표준문서 등이 구체적으로 마련되지 않다. 유지보수 성능 수준을 향상시키고 유지보수를 평가, 관리하는데 있어 사용 할 수 있는 측정지표 등이 연구되어야 할 것이다. 본 연구에서는 자산관리를 위해 사용되는 유지보수스코어카드를 바탕으로 소프트웨어 유지보수 형태에 따라 유지보수 비용의 감소와 분석에 효과적으로 사용할 수 있는 측정지표와 정량적 계산이 가능한 비용 측정지표에 대하여 연구한다.

• Journal of the Korea Society of Computer and Information
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• v.18 no.5
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• pp.77-85
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• 2013

In this paper, we present the cost measurement metrics for the operation management and service improvement besides the general maintenance. The cost measurement metrics of the operation management and service improvement are based on the metrics that are classified and summarized precedent studies and complemented by empirical measuring indicators, and we propose the maintenance cost estimation model based on this metrics. The maintenance costs can be calculated detailedly, because the proposed metrics can be used selectively, depending on the scope of the information system maintenance. The effectiveness of the proposed maintenance cost measurement metrics and cost estimation model is verified by comparison between existing studies and our research.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.601-601
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• 2015

비홍수기 하천유량관리는 정해진 기준 이상으로 유량을 유지하는 데 목적을 두며 유량관리를 위한 기준유량으로는 하천유지유량이나 하천관리유량이 주로 사용되고 있다. 이들 기준유량과 함께 최근에는 하천 유량 변화를 효과적으로 파악하고 유량변화에 따른 갈수상황을 객관적으로 판단하기 위한 의사결정 도구로 갈수지표가 활용되고 있다. 본 연구에서는 낙동강 주요 홍수예보지점의 하나인 진동지점을 대상으로 유량자료를 수집하고 갈수지표를 이용한 유량평가를 실시하였다. 다양한 갈수지표 중 특정기간을 대상으로 일정시간 가장 낮은 유량을 갈수지표로 활용하는 기법과 동일기간 유량자료의 저유량백분위 기준을 적용하여 이를 갈수임계값으로 활용하는 기법을 적용하였다. 전자는 7Q10(Singh, 1974)이 대표적이며 이는 10년 중 가장 낮은 값을 갖는 7일의 유량이 갈수의 기준이 된다. 본 연구에서는 7Q10의 기간을 20년으로 확대한 7Q20을 적용하였다. 후자는 WMO(2008)에서 적용된 바 있으며 본 연구에서는 1~12월의 월별 저유량90분위(Q90)를 갈수임계값으로 선정하였다. 신뢰할 수 있는 장기유량자료의 활용을 위해 "장기 수문자료 검증 및 평가연구"(한강홍수통제소, 2011)를 통해 수정, 보완된 진동지점의 과거 20년간(1994~2013) 유량자료를 활용하였으며 갈수지표와 함께 유량관리를 위한 기준유량으로 활용되는 하천유지유량(2006년 고시)과 하천관리유량(2013년 기준)의 유량만족도를 비교하였다. 과거 가뭄발생 및 제한급수시기, 강수량 등과 비교했을 때 월별 갈수임계값(Q90)을 갈수지표로 활용한 경우가 갈수관리에 효과적이라 판단되었다. 해당 기법은 통계학적 유의성을 갖기 위해서 장기수문자료의 활용이 필요하나 유량의 시계열 변동특성 반영이 가능하므로 우리나라와 같이 갈수기와 홍수기의 구분이 명확하고 하상계수가 큰 지역에서는 장점을 갖는 것으로 판단된다.

• Journal of Korean Tunnelling and Underground Space Association
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• v.18 no.6
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• pp.525-533
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• 2016

The purpose of current tunnel maintenance system in South Korea is safety-based maintenance system for accident prevention, So it is difficult to conduct a strategic maintenance. The development of a new maintenance system can lead to effective investment of limited financial and it's effort is still in progress. In this study, to develop a performance-based assessment method, indexes for assessment are derived taking into account the safety, durability and serviceability. The indexes for performance-based assessment were selected by a literature analysis and a delphi survey. Then the importance among indexes were calculated by the AHP analysis.

• Journal of the Korea Institute of Building Construction
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• v.11 no.1
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• pp.51-59
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• 2011

With the increased demand for membrane structures in recent years, there have been many studies of their mechanical properties, to the extent that such structures have become recognized as independent structures with a level of safety and durability comparable to those of other general structures. But in reality, the study for the maintenance of membrane structures has not been as active. In particularly, the study of watertightness from the perspective of maintenance has been very limited. Accordingly, a study on securing watertightness performance and the guidelines for maintenance is necessary. In this study, through a case study of water leakage accidents in membrane structures overseas, causes of leakage were selected from the membrane material itself, joint parts and open door of roof part in membrane structure. The water leakage and deterioration elements were analyzed from those leakage causes. The degree of importance of the water leakage and deterioration index was also designated using the AHP (Analytic Hierarchy Process) method. As a result, the basic technical index was suggested for the maintenance of the roofs of large-span membrane structures to prevent water leakage. This index will be used to make a guideline for the long-term maintenance of the roofs of large-span membrane structures.

• Journal of the Korea Convergence Society
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• v.11 no.6
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• pp.37-42
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• 2020

In the field of public informatization maintenance business, the attacks of external illegal users such as unauthorized leakage, destruction, and alteration due to intentional or inadequate management of personal information are increasing. In order to prevent such security incidents in advance, it is necessary to develop and quantitatively manage SLA indicators. This study presents the privacy SLA indicators and suggests specific methods such as information collection method and timing of the privacy SLA indicators. In order to confirm the validity and reliability of the proposed SLA indicators, an online survey was conducted with a group of experts. As a result, it was evaluated that compliance rate of personal information destruction and compliance rate of personal information protection system would be effective when applied to new and revised SLA indicators in terms of importance and validity. In the future, using SLA indicators for personal information protection as a standard for public information maintenance will contribute to improving SW quality and securing safety.

• Journal of Korea Water Resources Association
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• v.43 no.7
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• pp.609-623
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• 2010

In this paper the feedback loop mechanisms that are inherent in the management of water supply systems were identified based on the system dynamics modeling methodology. As a result, a system dynamics (SD) computer simulation model that can be used to aid efficient management of water supply systems was developed. The developed SD model can be used to predict operating conditions of water supply systems including the effects of pipe maintenance on the entire system. The developed model is consisted of water supply, pipe maintenance and water supply business finance model. The operation and maintenance data from a study water supply system were used to verify the model and to predict the past and future operating conditions of the system. The policy leverage that greatly affects the operating condition was evaluated by the sensitivity analyses for the operational indices due to changes in the exogenous variables. It was found that while the pipe maintenance related exogenous variables had great effects on the leakage and conditions of pipes, they did not have great effects on the major operational indices such as revenue water ratio. It is considered that the social costs due to leaks and pipe breaks and the corresponding mechanism of propagation of the costs must be modeled to better evaluate the effects of pipe maintenance on the operational conditions of water supply systems.

• Journal of the Korean GEO-environmental Society
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• v.19 no.2
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• pp.37-44
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• 2018

Ballasted track has been widely used due to its flexibility. However, the plastic deformation of ballasted track causes the evolution of track geometrical errors, and hence it requires continuous maintenance; increase in number of trains, weight, and speed expedites maintenance frequency and cost as well. Ballast stiffness is well-known as an indicator of design and maintenance. In this regard, this paper aims to suggest the method to measure ballast track stiffness using light-weight deflectometer (LWD) and thus verify its applicability as a maintenance measure. Preliminary field tests determined simple field testing protocol to measure track stiffness. The apparent ballast stiffness by LWD shows good corelation with TQI (Track Quality Index) and maintenance length. That is, as average of apparent stiffness increase, TQI and tamping length decrease exponentially. Therefore, apparent stiffness can be used as an index for ballast condition assessment.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.889-893
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• 2006

현재 우리나라는 유역전반에 걸쳐 얼마나 많은 유량이 사용되고, 어디에서 사용되며 저류되어 있는지, 생태유지 등을 위해 얼마나 많은 유지 유량이 필요한지, 현재 어느 정도의 유량이 확보되어 있는지 등에 대한 검증된 자료들이 전무한 실정으로 향후 수자원 관리에 있어서 효율적 관리가 매우 어려운 입장이다. 따라서 본 연구에서는 21세기 프론티어 사업의 일환으로 수행중인 '유역 물관리 운영 기술 개발' 과제를 통해 산출된 금강유역의 소유역별 용수이용량 및 유출량 자료 등을 토대로 소유역별 시공간적 물이용 상황을 파악하고 물 관리 지표들을 산정함으로서 효율적인 운영이 가능하도록 하고자 Water accounting을 실시하여 시공간적 Water accounting지수를 산정함으로서 효율적인 운영이 가능하도록 하고자 한다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2003.11a
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• pp.1241-1242
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• 2003

본 연구는 Usability의 투자 성과관리(ROI: Return On Investment)를 위한 균형성과지표(BSC: Balanced ScoreCard) 관점에서의 Framework 개발을 목표로 한다. 2000년 이후 Usability에 대한 투자 규모는 높은 증가세를 유지해 왔으나 대규모 투자가 진전되는 가운데 Usability투자의 수익성을 어떻게 확보하고, 그 효과(Effectiveness)는 어떻게 측정할 것인가 하는 문제는 상대적으로 관심을 끌지 못하고 있다. Usability 투자에 대한 시스템적 성과관리를 위해 개발된 Usability BSC Framework은 BSC의 4가지 관점에서 Usability 투자성과관리에 대한 변형된 관점의 모델을 제안한다.