• International Journal of Naval Architecture and Ocean Engineering
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• 제13권1호
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• pp.367-378
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• 2021

This paper develops a dynamic regression model to quantify the contribution of key external factors to operational energy efficiency of ships. On this basis, kernel density estimation is applied to explore distribution patterns of fluctuations in operational performance. An empirical analysis based on these methods show that distribution of fluctuations in Energy Efficiency Operational Indicator (EEOI) is leptokurtic and fat tailed, rather than a normal one. Around 85% of fluctuations in EEOI can be jointly explained by capacity utilization and sailing speed, while the rest depend on other external factors largely beyond control. The variations in capacity utilization and sailing speed cannot be fully passed on to the energy efficiency performance of ships, due to complex interactions between various external factors. The application of the methods is demonstrated, showing a potential approach to develop a rating mechanism for use in the legally binding framework on operational energy efficiency of ships.

• Architectural research
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• 제14권1호
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• pp.35-44
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• 2012

Build-Transfer-Lease (BTL) was introduced to the domestic construction market in 2005. Now, seven years later, the BTL model is most active for educational facilities. In 2011, 93 educational facility projects entered the maintenance stage. Considering the characteristics of today's BTL projects for educational facilities, the main issues are the initial performance and maintenance of educational facilities and the service-providing status for the 20-year operational management period, in relation to providing safety and convenience to students, the facility users. Seeking a solution, local education offices and departments in charge of BTL under the Ministry of Education, Science, and Technology have been exploring various methods of evaluating operational maintenance performance from various perspectives. For educational facility BTL projects, however, the appropriateness of initial operation performance evaluation, rather than considering the 20-year operational management period, is controversial in regards to sustainability. On this account, performance evaluation items in four areas-operational maintenance evaluation, facility performance status evaluation, maintenance subject evaluation, and sustainable change response evaluation-should be extracted. An indicator of facility performance evaluation is presented in this study through an AHP survey targeting experts, as part of establishing an operation performance evaluation system for educational facility BTL projects.

• Nuclear Engineering and Technology
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• 제48권1호
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• pp.114-128
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• 2016

The development of operational performance indicators is of utmost importance for nuclear power plants, since they measure, track, and trend plant operation. Leading indicators are ideal for reducing the likelihood of consequential events. This paper describes the operational data analysis of the information contained in the Corrective Action Program. The methodology considers human error and organizational factors because of their large contribution to consequential events. The results include a tool developed from the data to be used for the identification, prediction, and reduction of the likelihood of significant consequential events. This tool is based on the resilience curve that was built from the plant's operational data. The stress is described by the number of unresolved condition reports. The strain is represented by the number of preventive maintenance tasks and other periodic work activities (i.e., baseline activities), as well as, closing open corrective actions assigned to different departments to resolve the condition reports (i.e., corrective action workload). Beyond the identified resilience threshold, the stress exceeds the station's ability to operate successfully and there is an increased likelihood that a consequential event will occur. A performance indicator is proposed to reduce the likelihood of consequential events at nuclear power plants.

• 재활복지공학회논문지
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• 제8권1호
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• pp.57-66
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• 2014

본 연구는 현재 국내 연하장애 환자를 대상으로 하는 연하장애 기능적 전기 자극 치료 장비의 사전 사후 점검과 유지 보수와 관련한 설문조사를 실시하고 장비사용 현황과 관리 실태를 분석함으로서 체계적인 치료 장비 관리 가이드라인 개발의 필요성을 제시하는데 그 목적이 있다. 연구대상은 상급종합 병원, 종합병원, 재활병원, 요양병원을 포함하는 총62개 기관 중 최종적으로 설문에 응답한 50개 기관이었다. 연하장애 기능적 전기 자극 치료 장비의 사전 사후 점검과 유지 보수 현황과 실태를 파악하기 위한 설문지를 개발한 후, 이를 기초로 2013년 8월 21일부터 2013년 11월 10일간의 연구 자료를 분석에 사용하였다. 연구 결과, 장비는 활발히 사용하고 있었으나 장비의 사용 전 작동 검사, 사용 후 작동 검사, 유지 및 보수, 소독 보관 등의 항목에서 체계적인 관리를 하지 않고 있었다. 혼수상태이거나 인지가 현저히 저하된 환자에게 적용하는 방법과 관련한 항목에서도 표준화된 방법이 없거나 가이드 라인이 제시되었더라 하더라고 실제 사용하지 않고 있는 것으로 밝혀졌다. 이는 장비의 사전 사후 점검과 유지 보수에 대한 표준화된 가이드라인 및 질 관리 지표 개발에 대한 연구의 필요성을 제시한다.

• 산업경영시스템학회지
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• 제46권2호
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• pp.32-46
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• 2023

Recently, small and medium-sized manufacturing companies have shown increased interest in and participation in smart factories in order to survive in market competition. However, many SMEs build smart factories without a systematic review or preparation, which leads to them not being able to use them properly. This study considers the main reason for the low utilization rate of smart factories to be a lack of sufficient reflection of user requirements. Therefore, a method and procedure for deriving the priority of smart factory requirement functions and operating performance indicators based on QFD is proposed as a solution to this issue.

• International Journal of Naval Architecture and Ocean Engineering
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• 제8권5호
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• pp.511-518
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• 2016

The dynamic positioning system (DPS) maintains an offshore vessel's position and heading under various environmental conditions by using its own thrust. DPS is regarded as one of the most important systems in offshore vessels. So, efficient operation and maintenance of the DPS are important issues. To monitor the DPS, it is necessary to define an appropriate key performance indicator (KPI) that can express the condition of the DPS from the perspective of operational efficiency and maintenance. In this study, a new KPI for the DPS is proposed considering the efficiency of the machinery and controller, the energy efficiency, and the environmental conditions in which the DPS is operated. The KPI is defined as a function of control deviation, energy consumption, and environmental load. A normalization factor is used to normalize the effect of environmental load on the KPI. The KPI value is calculated from DPS simulation and model test data. The possibility of applying the KPI to monitoring of DPS condition is discussed by comparing the values. The result indicates the feasibility of the new KPI.

• International Journal of Railway
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• 제6권4호
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• pp.131-138
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• 2013

We have studied the financial performance of Pakistan Railways and found that the financial indicator (net earnings ratio) of Pakistan Railways is consistently decreasing over the years, causing severe financial and operational crises. The implication of our study indicates that the '3Rs' Strategy (retrenchment, repositioning and reorganizing) should be put into practice and furthermore, favorable changes in environmental factors can also contribute towards organizational turnaround. This study would help the Government of Pakistan to think and plan more clearly about turnaround strategies that could improve the performance and growth of Pakistan Railways.

• 전기학회논문지
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• 제66권1호
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• pp.229-236
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• 2017

The railway has recently been expanded with the phase of the future transportation. Accordingly, using the new technologies such as smart devices and LTE-R, the needs for reducing operational costs and improving passenger services have emerged. To realize these needs, the government is pushing to build the dedicated wireless network for the railway systems. In this paper, the shunting route indicator was selected for this study because it has the best effect for the wireless system removed lots of wired cables. And the wireless shunting route indicator applied with LTE-R technology was developed to replace the current wired control system. The functional goal(the wireless control function applied LTE-R), the performance goal(less than 300ms for transferring the control information), and the reliability goal(over the 100,000 hours for MTBF) were set, and these goals were achieved and demonstrated through the test and validation.

• 한국항공운항학회지
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• 제26권1호
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• pp.37-43
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• 2018

There has been the migration to a performance-based approach in many areas which include transition planning at global, regional and local levels, performance-based navigation and safety management. Achieving continuous success of Air Traffic Management (ATM) systems would require a performance-based approach to raise productivity and efficiency of it through performance measurements and reviews. This paper considers establishment planning of performance measurement and evaluation system for ATM. Related to key performance areas proposed by International Civil Aviation Organization, performance indicators and metrics which could be used to measure and evaluate ATM performance are presented. Also, organizational system and operational planning for efficient operation of ATM are presented.

• 산업경영시스템학회지
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• 제37권4호
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• pp.193-201
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• 2014

This study attempts to utilize the economic efficiency analysis results focused on the break-even point as an indicator for the decision making of commanders and staff. We suggested a method of determining economic life by utilizing logistics information system and commercial program Minitab with a focus on the equipment's operational environment and performance data, whereas previously the equipment's retirement period was simply determined by the current equipment prices and sustainable period.