• 제목/요약/키워드: The efficiency of performance

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지방의료원의 성과분석: Data Envelopment Analysis와 패널분석 (The Performance Evaluation of Public Municipal Hospitals: Data Envelopment Analysis and Panel Analysis)

  • 정은영;서영준;이해종
    • 보건행정학회지
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    • 제25권4호
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    • pp.295-306
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    • 2015
  • This study aims to examine the performance of public municipal hospitals through the analysis of data envelopment analysis, efficiency, profitability, and publicness by using panel data during period from 2006 to 2010. The main findings of the study are as follows. First, as a result of efficiency analysis during the period from 2006 to 2010, it was revealed that the number of staff by each job category, labor cost ratio, the number of operating beds need to be decreased. Second, the performance data represented by the indicators of efficiency, profitability and publicness were complementary and showed a tendency of being increased or decreased in same direction. Third, from the result of panel analysis, the efficiency was mainly influenced by the structural factors, while the profitability was influenced by managerial factors, and the publicness by medical environment. In conclusion, in order to enhance the performance of public municipal hospitals in Korea, it is important to harmonize the effort for efficiency, financial and policy support by central and local government, and the continuous participation of community residents.

PVT 시스템의 PV 모듈 및 태양열 집열기 대비 성능 및 효율 비교분석 (The Performance and Efficiency Analysis of a PVT System Compared with a PV module and a Solar collector)

  • 어승희;이정빈;최윤성;김대현
    • 한국태양에너지학회 논문집
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    • 제32권2호
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    • pp.1-10
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    • 2012
  • A photovoltaic/thermal (PVT)solar system is the solar technology that allows for simultaneous conversion of solar energy into both electricity and heat. This paper compared the performance of PVT system with a conventional PV module and solar collector and analyzed electrical and thermal efficiency of PVT system in terms of solar irradiance and inlet temperature of the working fluid. Based on the experimental data, thermal and electrical efficiencies of he glazed PVT system were57.9% and14.27% under zero reduced temperature condition which were lower by 13.6% than the solar thermal absorber plate and by 0.08% than the PV module respectively. For the unglazed PVT system it had lower thermal efficiency than the solar thermal absorber plate but higher electrical performance than the PV module due to the cooling effect by the working fluid. However, total efficiency of the glazed PVT system was72.2% which was higher than combined efficiencies of the solar collector and PV module. Besides, total efficiency of the PVT system would be much higher if calculated based on unit area.

PVT 시스템의 PV 모듈 및 태양열 집열기 대비 성능 및 효율 비교분석 (The Performance and Efficiency Analysis of a PVT System Compared with a PV module and a Solar collector)

  • 어승희;이정빈;최윤성;김대현
    • 한국태양에너지학회:학술대회논문집
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    • 한국태양에너지학회 2011년도 추계학술발표대회 논문집
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    • pp.60-67
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    • 2011
  • A photovoltaic/thermal(PVT)solar system is the solar technology that allows for simultaneous conversion of solar energy into both electricity and heat. This paper compared the performance of PVT system with a conventional PV module and solar collector and analyzed electrical and thermal efficiency of PVT system in terms of solar irradiance and inlet temperature of the working fluid. Based on the experimental data, thermal and electrical efficiencies of the glazed PVT system were 57.9% and 14.27% under zero reduced temperature condition which were lower by 13.6% than the solar thermal absorber plate and by 0.08% than the PV module respectively. For the unglazed PVT system, it had lower thermal efficiency than the solar thermal absorber plate but higher electrical performance than the PV module due to the cooling effect by the working fluid. However, total efficiency of the glazed PVT system was 72.2% which was higher than combined efficiencies of the solar collector and PV module. Besides, total efficiency of the PVT system would be much higher if calculated based on unit area.

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태양전지 셀의 열화와 직렬저항의 변화에 따른 태양전지 모듈의 특성 해석 (The performance analysis of photovoltaic module accounting for solar cell degradation and series resistance)

  • 박지홍;강기환;화이티루 로렌스;안형근;유권종;한득영
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
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    • pp.28-29
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    • 2006
  • When photovoltaic module is used for a long time, its performance decreases due to several reasons. In this paper, we focus on the possibilities mainly contributing to the degraded efficiency of the polycrystalline silicon photovoltaic modules. The analysis is based on the modules that have been used for 15 years. These are two main reasons that cause the efficiency degradation, the corrosion and thermal decomposition. The former phenomenon of electrode is mainly due to the moisture from damaged back sheet in some module. However the other reason of the degraded efficiency comes from the thermal decomposition, which can not be observed from the outside but only by experiment. In this study, the comparison between the efficiency of normal modules and degradation modules is presented. Module having degraded cell was seen to cause increase of series resistance by about 80%, in comparison to normal samples efficiency which reduce by about 20%. This study shows that the effects of series resistances on module performance are critical. These effects must be understood and taken into consideration when analyzing performance degradation.

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The Impact of Capital Adequacy and Operating Efficiency on Saudi Banks Performance

  • Khaled Subhi, RAJHA
    • The Journal of Asian Finance, Economics and Business
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    • 제10권2호
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    • pp.333-341
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    • 2023
  • This study investigates the impact of capital adequacy and operating efficiency on the performance of Saudi banks. In the first part, the study includes a brief introduction focused on the impact of capital adequacy and operating efficiency on the performance of banks. In the second part, a literature review examined various studies on the impact of capital adequacy and operating efficiency on banks' performance. The study methodology was presented in the third part, based on a sample that included all local Saudi banks from 2010 to 2021, using a study model to answer the study hypotheses. The results of the panel data regression indicated that CAR had a negative and significant effect on ROA and ROE but a negative and non-significant effect on NIM. CIR has a negative and significant effect on ROA, ROE, and NIM, while SIZE, LTD, and MS have a positive and significant effect on ROA, ROE, and NIM. Elimination of defects has no significant effect on return on assets, return on equity, and the NIF. But CR has no significant effect on ROA and ROE but has a positive and significant effect on NIM.

DEA 교차분석 모형을 이용한 자동차 부품기업의 효율성 측정에 관한 연구 (A Study on the Measurement of the Efficiency of Auto Parts Firms Using DEA Cross Analysis Model)

  • 신정훈;황승준
    • 한국경영과학회지
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    • 제42권2호
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    • pp.49-61
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    • 2017
  • The study on the efficiency analysis of Korean automobile parts companies is mostly based on the calculation of the size of output such as sales. However, the performance indicators such as sales, operating profit, and net profit are directly related to the cost structure, and this cost structure is affected by changes in the company's asset structure and capital structure. As a result, it is necessary that efficient capital procurement should be done at the same time to create efficient management performance through proper investment. In this study, we aim to measure the efficiency of asset and capital procurement compared to the sales figures, such as sales, generated by 33 primary suppliers who supply parts to Hyundai Kia Motors. For this purpose, this study proposed a DEA cross analysis model that can simultaneously measure efficiency in terms of input assets and capital procurement based on the same management performance when analyzing the efficiency of domestic auto parts companies.

Present Status and Further Development of Performances of Industrial Gas Turbine Engine Turbogreen 1200

  • 민대기
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 1998년도 유체기계 연구개발 발표회 논문집
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    • pp.191-197
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    • 1998
  • The recent results of the engine development performed in this you on Turbogreen 1200, the first industrial gas turbine engine developed in Korea, are presented. In order to improve the engine performance and structural stability from the first prototype engine, several variants of the engine and major components such as combustor and rotor assembly have been developed and tested. This paper shows these results especially focused on the engine test and performance analysis, in which test system, instrumentation and data processing are discussed as well. The engine performance and its trend give relatively good coincidence with the design ones. At design power of 1.2MW, the thermal efficiency of the engine is estimated over $25\%$ which is below the design target of $27.2\%$. This gap of efficiency is caused mainly by large tip clearance between turbine blades and casing. Considering high design efficiency superior to those of other competitive engines in this power class, Turbogreen 1200 would have a strong competition in its performance if the design efficiency is achieved by further developments such as tip clearance control, which are very possible and natural in final mass production of the developed gas turbine engine.

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Tip Clearance Effect on Through-Flow and Performance of a Centrifugal Compressor

  • Eum, Hark-Jin;Kang, Young-Seok;Kang, Shin-Hyoung
    • Journal of Mechanical Science and Technology
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    • 제18권6호
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    • pp.979-989
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    • 2004
  • Numerical simulations have been performed to investigate tip clearance effect on through-flow and performance of a centrifugal compressor which has the same configuration of impeller with six different tip clearances. Secondary flow and loss distribution have been surveyed to understand the flow mechanism due to the tip clearance. Tip leakage flow strongly interacts with mainstream flow and considerably changes the secondary flow and the loss distribution inside the impeller passage. A method has been described to quantitatively estimate the tip clearance effect on the performance drop and the efficiency drop. The tip clearance has caused specific work reduction and additional entropy generation. The former, which is called inviscid loss, is independent of any internal loss and the latter, which is called viscous loss, is dependent on every loss in the flow passage. Two components equally affected the performance drop as the tip clearances were small, while the efficiency drop was influenced by the viscous component alone. The additional entropy generation was modeled with all the kinetic energy of the tip leakage flow. Therefore, the present paper can provide how to quantitatively estimate the tip clearance effect on the performance and efficiency.

The Relation between Management Efficiency and Financial Performance in Public Institutions

  • Jang, Ji-Kyung
    • 한국컴퓨터정보학회논문지
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    • 제27권4호
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    • pp.161-167
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    • 2022
  • 본 연구는 공공기관의 경영 효율성과 재무적 성과와의 관련성을 분석하는 것을 목적으로 한다. 공공기관 경영정보 공개시스템에 공시된 공기업을 대상으로 2017년부터 2020년까지의 기간 동안 재무자료를 입수하여, 자료포락분석을 통해 경영 효율성을 측정하였다. 본 연구는 자료포락분석을 통한 경영 효율성 변수와 총자산이익률 및 매출액순이익률로 측정한 재무적 성과 간의 관련성을 다중회귀분석을 통해 분석하였다. 본 연구의 결과는 다음과 같다; 먼저 공기업의 경영 효율성은 총자산순이익률과 유의한 양의 관련성을 나타내었다. 이러한 결과는 매출액순이익률을 사용한 분석에서도 동일하게 나타났다. 이는 경영 효율성이 공기업의 재무적 성과를 개선시키는 요인임을 의미한다. 본 연구의 결과는 경영 효율성 증대를 통해 궁극적으로 공공기관의 재무적 안정성을 강화하고자 한 정부 전략이 유효하게 작용할 수 있음을 시사한다.

DEA 분석을 통한 프랜차이즈 기업의 평가 (An Assessing of Franchisor's Firm Performance Based on Data Envelopment Analysis)

  • 김선민
    • 대한안전경영과학회지
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    • 제16권4호
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    • pp.359-369
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    • 2014
  • Due to the severe market conditions, pre-entrepreneur seeks to start their business through franchise company. This paper, using the data envelopment analysis(DEA) method, examines efficiency of a group of franchise company in order to provide efficiency information with pre-entrepreneur. Output-oriented DEA model is applied in the investigation of efficiency, and the overall efficiency score is decomposed into pure technical efficiency and scale efficiency. The input variables selected to evaluate the efficiency are franchise deposit, franchise contribution cost and the output variables are sales and number of franchises, and length of business. The results of this paper show franchise industry have the low level of overall efficiency and the main sources of inefficiency is found technical rather than scale. As a result, this paper provides not only the current status of efficiency information of a franchise with pre-entrepreneur but also give warning when they sign-up with franchise business.