• Title/Summary/Keyword: Efficiency Change

Search Result 3,753, Processing Time 0.041 seconds

Measuring Efficiency and Productivity Change of the Korean Life Insurance Industry (우리나라 생명보험 산업의 효율성 및 생산성변화 분석)

  • Hong, Bong-Young
    • The Korean Journal of Financial Management
    • /
    • v.20 no.2
    • /
    • pp.263-291
    • /
    • 2003
  • The purpose of this paper is to analyse the change in the productivity of Korean life insurance industry by Generalized Malmquist productivity indices. Generalized Malmquist indices will be decomposed into three components such as pure efficiency change, scale efficiency change, and technical change. The principal findings indicate an overall increase in productivity driven more by technical progress than pure technical efficiency and scale efficiency.

  • PDF

Evaluating Production Efficiency in a Fisheries Wholesale Sector (수산물 도매업의 생산 효율성 평가에 관한 연구)

  • Pyo, Hee-Dang;Kim, Jong-Chean
    • The Journal of Fisheries Business Administration
    • /
    • v.41 no.3
    • /
    • pp.21-44
    • /
    • 2010
  • The paper estimates changes in total factor productivity and technical efficiency change index and technical change index using Malmquist productivity index(MPI) in fisheries wholesale products over the time period of 2006 through 2008. The model considers a number of employees and operating costs as input factors, and sales and EBIT(earnings before tax and interest) as output factors. The results indicate that, between 2006 and 2007, there is in general technical progress in which TCI(Technical Change Index) indicates 2.7994 in the sale scale of 50 million won through 100 million won, while there are no efficiency in TECI(Technical Efficiency Change Index), PECI(Pure Efficiency Change Index) and SECI(Scale Efficiency Change Index) which are estimated to be around 1. Between 2007 and 2008 technical efficiency and technical progress are generally declined, compared to those of 2006 and 2007. Wilcoxon's rank-sum test shows that there are statistically significant difference of TCI and MPI between two periods at the level of 5%, while there are statistically significant difference of TECI, PECI and SECI between two periods at the level of 5%.

Total Factor Productivity Growth and the Decomposition Components of Korean Port-Logistics Industry (항만물류산업의 총요소생산성과 그 분해요인분석)

  • Gang, Sang-Mok;Lee, Ju-Byeong
    • Journal of Korea Port Economic Association
    • /
    • v.24 no.4
    • /
    • pp.47-70
    • /
    • 2008
  • The purpose of this study is to estimate total factor productivity(TFP) growth by stochastic frontier function and to grasp contributing factors of its growth rate by decomposing the total factor productivity into efficiency change, technical progress, scale change, and allocation change. Annual growth rate of total factor productivity for 1990-2003 is 0.019 (1.9%), higher than that of overall industry (0.010). The main component of TFP growth is not efficiency change but technical progress. Contributing factors of total factor productivity growth are change of allocation efficiency in port industry, technical progress in sea-transportation industry, and change of scale efficiency in transportation-equipment industry. The change of total factor productivity shows a decreasing trend since late in the 1990s. The annual technical efficiency of port-logistics industry is less than that of overall industry. Capital elasticity for output (0.391) is higher than labor elasticity (0.227), but scale economy of port-logistics industry is 0.618, which is far from optimal scale economy.

  • PDF

Analysis on Productivity Change in Korean Shipbuilding Industry using Malmquist Productivity Index (Malmquist 생산성 지수(MPI)를 이용한 한국 조선 산업의 생산성 변화)

  • Park, Seok-Ho
    • Journal of Korea Port Economic Association
    • /
    • v.34 no.1
    • /
    • pp.51-64
    • /
    • 2018
  • The purpose of this paper is to analyze the productivity change of the Korean shipbuilding industry between 2001-2008 and 2008-2015 by using MPI(Malmquist Productivity Index) to decompose the sources of total factor productivity growth into technical efficiency change, scale efficiency change, pure efficiency change, technical change. The empirical results are as follows. In the first half of the year (2001-2008), productivity increased by 2.8%, which was due to technological advances rather than technical efficiency. In the second half (2008-2015), productivity change declined by -3.4%. This is attributable to the technical efficiency deterioration and technological degeneration caused by a decrease in shipbuilding orders due to the global economic downturn after the global financial crisis and the rise of Chinese shipbuilding industry. In the first half of the period, productivity change was higher than in the second half. Especially, the difference between the two periods is attributed to the technical change and it was proved by statistical verification. The policy implications of this paper suggest that the government and each DMU need to develop new technologies to cope with changes in the global shipbuilding industry environment and strategies to eliminate inefficiencies in order to increase productivity in the future.

A Study on the Control of Apartment House Design Factors considering Energy, Environment and Economical Efficiency (에너지, 환경 및 경제성을 통합 고려한 공동주택 설계요소 제어에 관한 연구)

  • Choi, Doo-Sung;Do, Jin-Seok
    • KIEAE Journal
    • /
    • v.12 no.6
    • /
    • pp.29-38
    • /
    • 2012
  • The current building energy efficiency rating certification regulation on apartment houses evaluates only the saving rate of energy consumed during operation, i.e. use, of a building, but doesn't consider the energy consumptions and environmental load($CO_2$) emissions occurring during the whole lifetime of a building. So this study calculated the energy consumptions and environmental load emissions occurring during the whole lifetime of a building, selected reference schemes and alternative items by design variables to present a design draft considering energy efficiency and environmental performance, and evaluated the total cost by combining and calculating its direct cost(material and heating cost) and indirect cost(environmental cost), for an existing apartment house as an evaluation object. As a result of analysis, the change of heating cost by alternative items of design variables showed a 4~8% change rate compared to the reference scheme, and the material cost of design variable 7 showed a maximum 4.4 times change rate in the alternative plan 6 compared to the reference scheme. The environmental cost showed a similar change rate to the material cost change rate in general, but showed a similar environmental cost change rate to the heating cost change rate in case of design variables 4-1, 4-2, 7.

Efficiency Analysis for Water Turbine Generator of Agricultural Reservoir (농업용 보의 수차 발전기 효율 분석)

  • Kim, Jong-Gyeum
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.62 no.9
    • /
    • pp.1223-1227
    • /
    • 2013
  • If the factory test efficiency and field operation efficiency of water turbine are different from each other, issues for efficiency warranty can be raised. So, This paper shows the result for comparative analysis of field operating efficiency vs plant testing efficiency of the water turbine generator installed in agricultural reservoir. The efficiency of the induction generator is analyzed by the change of rotational speed with the parameter obtained by test, the efficiency of water turbine is calculated by the change of head with the design flow. Efficiency deviation of induction generator is lower but the variation of developed power is pretty high near the rated speed and the efficiency variation of water turbine is high by the fluctuation of head for constant flow. It was found that factory test efficiency and total efficiency of water turbine generator calculated according to the rotational speed are very close.

Filtration Efficiency of Electrically Charged Air Filters by a Corona Method

  • Murtadlo, Zainul Alim Ali;Joe, Yun-Haeng;Park, Seok-Hoon;Park, Hyun-Seol
    • Particle and aerosol research
    • /
    • v.15 no.1
    • /
    • pp.15-25
    • /
    • 2019
  • The influences of corona charging parameters on collection efficiency and surface potential of air filters were investigated. A polypropylene filter medium was electrically charged using a corona charger, and the resulting surface potential and filtration efficiency against neutralized KCl particles were measured. The filter media was charged under different conditions of applied voltage, voltage polarity, charging time, and distance between electrodes. In addition, we considered charging both sides of the filter as well as charging one side of the filter. As a result, electrical force obtained by charged fiber affected filtration efficiency when the apply voltage strength was higher than 7 kV. Negatively charged filter had higher filtration efficiency than positively charged filter while the surface potential of the negatively charged filter was slightly lower than those of positively charged filter. Moreover, the filtration efficiency increased as the charging time of filter fiber increased and the distance between electrodes decreased. The filtration efficiency was more sensitive to changes of charging time than to those of electrode distance, and the efficiency of both sides charged filter was higher than that of single side charged filter.

Filtration Performance Characteristics according to Filter Bag Structure for Application of Industries (산업용 필터백의 구조에 따른 여과성능 특성)

  • Jeon, Seong-Min;Hasolli, Naim;Lee, Kang-San;Lee, Jea-Rang;Kim, Kwang-Deuk;Park, Young-Ok
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.32 no.4
    • /
    • pp.384-393
    • /
    • 2016
  • In this study, two kinds of industrial filter bags were tested for their filtration performance to apply the existing bag filter systems. Experimental variables were examined for pressure drop, cleaning interval, residual pressure drop, cleaning efficiency, fractional grade efficiency, total collection efficiency according to the filter bag structure. According to these results, the filter bags tested in this study demonstrated good performance in dust collection. This was also true for the double surface filter bag. The lifetime was longer than the round type filter bag because the filtration area was more than 1.6 times wider and the filter quality factor was much higher. Therefore, double surface filter bags are suggested to be used in order to increase filtration performance of the bag filter systems.

Thermodynamic performance of 2-PCM latent heat thermal energy storage system (2-PCM 잠열축열 시스템의 열역학적 성능)

  • 이세균;우정선;이재효;김한덕
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.12 no.2
    • /
    • pp.189-199
    • /
    • 2000
  • This paper investigates the thermodynamic performance of latent heat thermal energy storage system using two phase change materials(2-PCM system). The thermodynamic merit of using 2-PCM is clear in terms of exergetic efficiency, which is substantially higher than that of 1-PCM system. Optimum phase change temperature to maximize the exergetic efficiency exists for each case. The heat transfer area ratio of high temperature storage unit, X, becomes another important parameter for 2-PCM system if the phase change temperatures of given materials are different from those of optimum conditions. It is a good approximation for X$_{opt}$ to be 0.5 when optimum phase change temperatures are used. Otherwise X$_{opt}$ is determined differently as a function of given phase change temperatures.res.

  • PDF

The study of Luminescence Efficiency of OLED (유기발광 소자의 발광효율 연구)

  • Lee, Jung-Ho
    • Proceedings of the Optical Society of Korea Conference
    • /
    • 2004.07a
    • /
    • pp.172-173
    • /
    • 2004
  • Recently there has been many understood the basis device physics OLEDs and their basic operating principle. We demonstrate that there have many relation in order to improve luminescence efficiency both emitting light material physics characteristics and luminary. Efficient Electro Luminescence from organic materials was first reported in 1987 at Kodak. OLEDs emitting light material use tris-(8-hydroxyquinoline)(Alq3). Sudied maximum luminescence efficiency about structure of optimized emitting light layer of OLED which do observing change of luminescence efficiency by structure change of organic material in this paper.

  • PDF