• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.107-112
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• 2005

When it comes to automatic operation control of urban rail vehicle, a PID control makes it run between stations within the fixed time and stop exactly at the stop sign on the platform, satisfying jerk limit. An optimal control is applied to automatic operation performance control to minimize energy consumption while the urban rail vehicle satisfies automatic operation condition on this paper. The control performance in terms of energy minimization along with the constraint on precision stops is compared between the optimal control and PID control.

• Journal of Korea Trade
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• 제27권3호
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• pp.65-86
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• 2023

Purpose - As globalization progresses, complexity also increases, and various factors that threaten port functions are emerging. Accordingly, the demand for port security to prevent the crisis and resilience that quickly recovers its original function after the crisis is also increasing in port operations. However, few studies have examined how to ensure the port security and how the resilience affects operation performance of port and sustainability performance as well. So the study aims to find out how port security affects port resilience and port operational performance, and consequently, this two factors affect socioeconomic and environmental sustainability performance respectively and synthetically. Design/methodology - Confirmatory Factor Analysis (CFA) was first performed to determine the validity of the factors of model and hypothesis test was performed using Structural Equation Model (SEM) to analyze the Port Performance Model, which show the perception logic among port security level, port resilience, operation performance, and sustainability performance. In order to empirically analyze this model, total 264 respondents from port security operators, shipping companies in South Korea were surveyed. Findings - As result of SEM, First, port security level positively affected the resilience (H1) and cargo operational performance (H2) but not in both of the sustainability performances (H3, H4). Second, resilience positively affected only cargo operational performance (H5) and socio-economic sustainability performance (H7). Last, cargo operation performance positively affects the both of sustainability performances (H8, H9). Originality/value - It was confirmed that port security could improve cargo operational performance through ensuring port resilience and eventually increase the socio-economic sustainability. Therefore the study implies that careful integration and management of port security, port resilience, and sustainability are required, along with compromise on sustainable development goals in the social, economic, and environmental area among all stakeholders.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회B
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• pp.3236-3240
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• 2007

This paper describes the results of steam turbine performance tests. The objectives of performance test is to exactly evaluate the degradation(decrease in performance) of the coal-fired steam turbine generator in order to provide plant information to help performance engineers identify problems, improve performance, and make economic decisions about scheduling maintenance and optimizing operation. To achieve these goals, the periodic thermal performance tests have been carried out since the initial operation period, 1997. We made the calculation program and guidelines for the tests and developed the performance index of the turbine cycle on the basis of the ASME PTC. By comparing the performance changes throughout the whole operation period, we confirmed the performance reliabilities of the turbine and its conditions.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 가을 학술논문 발표대회
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• pp.10-11
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• 2021

Demands for digital transformation of the construction industry are increasing to improve the accuracy of the construction operation planning and the performance of the construction operation. Even though large number of studies are being conducted to this date, most of the studies are not likely to be available on the real sites. Therefore, this study provides construction managers with a methodology of drawing construction performance indicators based on productivity analysis using Artificial Neural Network (ANN) models and Web-CYCLONE. This methodology is expected to have high utilization and precision of construction operation planning and management.

• 한국소음진동공학회논문집
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• 제15권4호
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• pp.421-428
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• 2005

This paper described operation and vibration characteristics of a 'tail-fan' anti-torque performance test system. KARI (Korea Aerospace Research Institute) developed a 'tail-fan' anti-torque system of a helicopter and a performance test-rig to test the performance of the tail-fan. The performance test-rig consists of driving, supporting and rotating parts. In the process of the performance test, firstly, operation test of the test-rig were carried out to verify design specifications. Secondly, natural frequencies of fan blade and test-rig were measured respectively. Lastly, to find the operation rotating speed for the performance test, vibration test were carried out using accelerometers on tail gear box. The performance test conditions of the tail-fan to avoid a resonance were found from the fan-plot and vibration test results. The tail-fan performance tests were well done safely.

• 한국항행학회논문지
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• 제20권6호
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• pp.544-555
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• 2016

공항조직은 자존감을 획득하는 데 지속적으로 투자해야 한다. 이는 자존감이 보다 더 생산적이 될 것이기 때문이다. 본 논문의 목적은 항행시스템이 운영성과에 미치는 영향을 분석하고 자존감의 조절효과를 검증하는 것이다. 인천국제공항과 김포국제공항의 설문조사는 항행시스템 운영자 관점에서 공항의 운영성과를 설명할 수 있는 요인들을 더 잘 이해하기 위해 수행되었다. 이것은 항행정책, 유지보수, 증진활동 및 자존감의 증강된 활동 및 공항의 운영성과와 같은 구성요소를 포함한다. 본 연구의 발견은 자존감이 적극적으로 증진됨으로써 공항의 운영성과에 영향을 미친다는 것을 나타낸다. 또한 항행정책, 유지보수, 증진활동이 공항의 운영성과에 영향을 미치고 있다는 것을 확인하였다. 본 연구결과는 자존감이 주어진 공항조직에서 항행시스템 운영자의 자존감을 평가하는 강력한 측정도구의 기초가 될 수 있음을 제안한다.

• 한국콘텐츠학회논문지
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• 제20권12호
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• pp.287-300
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• 2020

본 연구는 노인복지관이 운영하는 실버 오케스트라 프로그램의 실천적 개선 방향을 도출하기 위하여 운영 속성에 대한 중요도-만족도 분석(IPA)을 수행하였다. 우리나라의 춘천동부노인복지관이 운영하는 '춘천 실버 오케스트라' 프로그램을 대상으로 실버회원 그룹(N=53)과 프로그램 운영자 그룹(N=32)을 조사 대상자로 선정하였다. '지역사회와의 연계', '예산 운영', '프로그램 운영', '인력 운영', '홍보전략', '프로그램 운영환경'을 포함하는 6개의 평가영역으로 구성된 평가지표를 설계하였다. 그리고 평가영역에 대하여 22개의 평가항목을 구성하였다. 본 연구의 결과, 실버회원 그룹에서는 '인력 운영'이 중요도와 만족도에서 가장 높은 우선순위를 가지는 것으로 나타났다. 프로그램 운영자 그룹에서는 '예산 운영'과 '인력 운영'이 중요도와 만족도에서 각각 가장 높은 우선순위를 차지하였다. IPA 매트릭스 분석을 통하여 나타난 연구 결과를 기반으로, 성공적인 프로그램 운영을 위해서는 실버회원 그룹과 프로그램 운영자 그룹의 관점에서 현상유지 및 강화, 집중투자 및 개선, 낮은 우선순위, 그리고 과잉노력 지양으로 영역화된 프로그램 운영 속성에 대해서 서로 차별화된 노력과 관심을 지속적으로 가져야 한다는 시사점을 제공한다.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2003년도 유체기계 연구개발 발표회 논문집
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• pp.80-87
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• 2003

Micro gas turbines are designed with low turbine inlet temperature and pressure ratio. To overcome the efficiency defect of the simple cycle, adoption of the recuperator is an inevitable choice. In addition to the design performance, we should also pay attention to the off-design performance of gas turbines since they usually operate at part-load conditions for a considerable amount of the time. This study aims at analyzing off-design performance characteristics of micro gas turbines and addressing the importance of the recuperator in the part load operation. Comparative analyses have been performed to evaluate the part load performance differences among various design and operating options : simple vs recuperative cycles, single vs two shaft configurations, various operating strategies for the single shaft configuration (fuel only control, variable speed operation, variable inlet guide vane control), and current vs advanced engines. Major finding is that maintaining turbine at high level is crucial in efficient operation of micro gas turbines.

• 농촌지도와개발
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• 제19권2호
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• pp.241-271
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• 2012

The objectives of this study were to explore the duties and tasks of educational program operation, to develop the performance model including the duties and tasks, and to construct the action manual of the tasks and duties in related with implementing effectively the educational program. The findings of this study were as follows. First, The identifying duties and tasks was 1,942 related with implementing educational program operation based on theoretical job model through activity analysis and experience sampling techniques. Second, the finding duties and tasks was reconstructed through classifying with 9 duties and 88 tasks, and then it was developed as educational program operation model of Korean Rural HRD Center. Finally Third, the implementing manual was constructed including the contents and task-elements.

• 지식경영연구
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• 제11권5호
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• pp.25-36
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• 2010

It is widely known that KMS (Knowledge Management System) plays a role of facilitator that contributes to upgrading the organizational performance. Despite this widespread belief, actual operation of KMS has been stalled at the level of being used only for the plain knowledge administration, not reaching the level of utilizing KMS strategically. In this sense, this case study suggests three successful KMS operation strategies-personalization strategy, socialization strategy, and technological strategy. Cases adopted in this study include HIRA(Health Insurance Review & Assessment Service) and KORAIL (Korea Railroad) where KMS has been successfully utilized to improve their organizational innovation and performance as well. Through scrutinizing the two cases, it was concluded that the proposed three KMS operation strategies have potentials of being generally applied to other KMS operation cases.