• Title/Summary/Keyword: 효율성측정

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A Study on the Model Development and Empirical Application for Measuring the Radial and Non-radial Efficiencies of Investment in Domestic Seaports (국내항만투자의 방사.비방사적 효율성 측정을 위한 모형개발 및 실증적 적용에 관한 연구)

  • Park, Ro-Kyung
    • Journal of Korea Port Economic Association
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    • v.27 no.1
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    • pp.185-212
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    • 2011
  • The purpose of this paper is to show the empirical analysis way for measuring the seaport efficiency by using the previous radial model and the newly modified non-radial models( panel additive model, panel RAM model, and panel SBM model)with Spearman rank order correlation coefficient(SROCC) for 20 Korean ports during 11 years(1997-2007) for 1 inputs(port investment amount) and 4 outputs(Number of Ship Calls, Port Revenue, Customer Satisfaction Score for Port Service and Container Cargo Throughput). The main empirical results of this paper are as follows. First, consistency ratio of SROCC in terms of efficiency scores between radial and panel Additive model was over about 76% and overall consistency ratio was about 71.6%. Second, an efficiency of panel RAM model was higher than that of radial model with similarity. However, panel SBM model shows the very similar efficiency scores with panel radial model. Third, the slack size of radial model is smaller compared to non-radial model. Models' ranking orders in terms of efficiency scores, number of efficient ports are panel RAM model, panel SBM model, and radial model. The order from the minimum efficiency scores was the same order like just before. The policy implication to the Korean seaports and planner is that Korean seaports should introduce the new methods like non-radial models(panel additive model, panel RAM model, and panel SBM model) for measuring the port performance.

Pairwise testing method applying the Weight Point for improving the efficiency skiing posture similarity measurement (스키 자세 유사도 측정의 효율성 향상을 위한 Weight Point를 적용한 Pairwise testing 방법)

  • Kim, chong-han;Park, jun-hyung;Jung, seung-moon
    • Proceedings of the Korea Contents Association Conference
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    • 2015.05a
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    • pp.331-332
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    • 2015
  • 스키 입문자의 경우 부상 등에 따른 두려움을 느끼거나 부정확한 자세가 익숙해져 바로잡기가 힘든 경우가 발생한다. 스키 트레이닝 시뮬레이터는 이러한 단점을 보완하여 스키 선수의 정확한 자세를 바탕으로 정확한 자세를 취할 수 있도록 유도하는 시스템이다. 본 논문에서는 스키 선수의 자세와 시뮬레이터 사용자의 자세를 비교하여 유사도를 측정하기 위해 사용한 알고리즘의 효율성을 향상하기 위해 특정 센서에 가중치를 부여하고 이들의 좌표값을 받아 계산하는 Pairwise testing 기법을 적용한다. 이는 센서간의 거리를 실시간으로 계산하여 두 자세의 유사도를 검출하는데 있어 비교 테스트 케이스를 감소시켜 유사도 측정의 효율성을 높일 수 있다.

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An Approach on Life Cycle Based Efficiency Measurement in Construction Industry (건설 생산의 Life Cycle을 고려한 효율성 측정방안)

  • Jung Soon-Oh;Yoon Su-Won;Chin Sangyoon;Kim Yea-Sang;Park Ji-Hoon
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2004.11a
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    • pp.608-611
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    • 2004
  • Efficiency of the construction process is one of the most important factors to project success. However efficiency is not well defined or measured in construction projects in general. More importantly, efficiency of the construction should be viewed through the life-cycle of the whole production system not in a single phase of the construction process. Therefore, this study defines the concept of efficiency and suggests the efficiency measurement model in construction. As a case study, the suggested model was applied to the curtain wall construction process of the high rise buildings as well.

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A Study on the Evaluation of Cleaning Ability Using Optically Stimulated Electron Emission Method (광전자방출(OSEE)법을 이용한 세정성 평가 연구)

  • Min, Hye-Jin;Shin, Jin-Ho;Bae, Jae-Heum
    • Clean Technology
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    • v.14 no.2
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    • pp.95-102
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    • 2008
  • In order to choose alternative environmental-friendly cleaning agents, it is very important in the present point that the systematic selection procedures should be introduced and applied to the industry through the evaluation of their cleaning ability, environmental characteristics, and economical factors, and that the objective and effective evaluation methods of cleanliness should be established for the industry. Thus, a novel cleaning evaluation method utilizing optically stimulated electron emission (OSEE) among various methods of cleaning ability was studied in this study. The contaminants used in this cleaning experiments were flux, solder, grease, cutting oil, and mixed soil of 35% grease and 65% cutting oil. The cleaning agents developed or prepared in our laboratory were employed and their cleaning ability were comparatively evaluated by the OSEE, gravimetry and contact angle methods. The experimental results in this work showed that flux cleaning efficiency measured by the OSEE method was similar to that of the gravimetric method, but that the OSEE method could not be compared with gravimetric method for the case of solder or grease cleaning because the contaminants radiate or absorb ultra-violet light. In case of cutting oil cleaning, the gravimetric method indicated its limitation of cleaning efficiency of cutting oil since it showed cleaning efficiency of 100%, even though residual soil remaining on the substrate surface a little after its cleaning. The comparative experimental results of cleaning ability evaluated by the OSEE- and contact angle measurement methods showed that they were similar in case of cleaning of flux, mixed soil and cutting oil. It was judged that the contact angle measurement method could evaluate the cleaning ability more precisely than the OSEE method for cleaning solder and grease.

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Analysis on RTS and the Change of Productivity Efficiency of Public General Hospitals in Vietnam using Parametric and Non-Parametric Approach (모수적․비모수적 기법을 활용한 베트남 공공종합병원의 규모수익과 생산효율성 변화 분석)

  • Yang, Dong-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.2
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    • pp.767-776
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    • 2014
  • This study estimated productivity change and RTS using Parametric and Non-Parametric approach with 5 year annual data from 2006 to 2010 of 20 public general hospitals in Vietnam collected from Ho Chi Min City Health Department of Health Database. The results could be summarized as follows; First, by the Non-Parametric approach. cumulated productivity growth of 5 years was increased by 2.8% due to regress 5.2% of technical efficiency, 0.3% of pure technical efficiency, but scale efficiency was decreased 5.1% Second, by the Non-Parametric approach, cumulated productivity growth was decreased by 12.8% to due to drop of 17.1% of technical change, 9.1% of scale efficiency. In conclusion, the common result of both approaches was that scale inefficiencies occurs in public hospitals in Vietnam, and they affected productivity change of public hospitals in Vietnam. Namely, 70% to 80% of the analyzed Vietnam public hospitals were at the status of DRS(decreased returns to scale), which suggested that they had oversupply beds relative to the number of occupied patients, it was meaningful that this study was the first study in Korea to measure efficiency and productivity change of Vietnamese public general hospitals and so it could be utilized as the basic information needed to enter hospital industry of Vietnam in the future.

Measurement of Spectrum Utilization Efficiency Considering Spectrum Sharing (주파수 공유를 고려한 전파자원 이용효율 측정 방안)

  • Kim, Taehan;Park, Hyun-Min;Sung, Ki Won
    • The Journal of the Korea Contents Association
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    • v.14 no.9
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    • pp.589-597
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    • 2014
  • The increasing demand for various mobile telecommunication services calls for more spectrum resource. Considering the scarcity of spectrum resource and the difficulties of development of higher frequency band, the unique way to meet the increasing demand is to maximize the utilization efficiency of the current spectrum resource. Under the circumstances, various spectrum sharing plans have been in recent studies to dissolve the excess spectrum demand. In addition, spectrum efficiency measurement methods become more important to verify the effectiveness of spectrum sharing and estimate the performance of various wireless systems. Our research addresses measurement methods to estimate spectrum utilization efficiency in a rational manner. Based on ITU-R recommendations, various measuring methods for spectrum utilization efficiency are reviewed. Then a queueing based approach is newly presented as alternatives to the current models. By using the proposed model, the spectrum efficiency increment with the adoption of spectrum sharing plans can be estimated more properly.

Fire Resistance and Thermal Stability Study of Fire-Retarded Polypropylene Systems by Using Cone Calorimeter and Thermogravimetry (콘 칼로리미터와 TGA를 이용한 할로겐 계통의 난연제를 첨가한 폴리프로필렌 수지의 난연성 및 열 안정성에 관한 연구)

  • 곽성복;정찬화;남재도;김준형;최미애
    • Polymer(Korea)
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    • v.24 no.6
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    • pp.777-786
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    • 2000
  • Fire resistance and thermal stability of polypropylene composite systems were investigated by using several halogenated fire-retardants such as decabromodiphenyl oxide (DBDPO) and chlorinated paraffin wax (CPW). The fire resistance of composite systems was thoroughly examined by measuring limited oxygen index (LOI, ASTM D2863, ISO 4589) and characteristic properties of cone calorimetry(ASTM E1354, ISO 5660) heat release rates (HRR), time to ignition (TTI), total heat release (THR), effective heat of combustion (EHC), mass loss rates, etc. Comparing the cone calorimetry experimental results of the halogen flame retardants, DBDPO exhibited twice higher efficiency than CPW in polypropylene systems, and the LOI also showed similar trends to cone calorimetry. The thermo-oxidative stability of the composite systems was increased about 30-5$0^{\circ}C$ in thermogravimetry analysis.Collectively, the combustion, extinction and thermally-stable characteristics of flame retardants were identified in this study.

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은행산업의 생산성 측정 -합병은행을 중심으로-

  • 유윤동;이원경;이상우
    • Proceedings of the Korean Statistical Society Conference
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    • 2001.11a
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    • pp.199-204
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    • 2001
  • 1997년 IMF 경제위기 이후 우리나라의 금융산업은 급격한 변화를 겪고 있다. 지난 4년간 은행들을 비롯한 금융기관들이 대형화를 통한 경쟁력 강화를 위해 합병이 실시되었다. 은행합병의 궁극적인 목적은 합병에 의해 규모를 대형화하고 업무범위를 다양화하여 수익규모를 증대시키고 수익원을 다원화하는 한편, 경영자원의 투입과 활용을 효율화하고 시장지배력을 확충하여 경영성과를 제고함으로써 기업가치를 증진시키는데 있다고 할 수 있다. 본 연구에서는 1997년 이후에 본격적으로 이루어진 합병은행들을 대상으로 맘퀴스트 ${\ulcorner}$Malmquist${\lrcorner}$ 총요소생산성(Total Factor Productivity) 지수를 사용하여 그 성과를 측정해 보았다.

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A Brief Empirical Verification Using Multiple Regression Analysis on the Measurement Results of Seaport Efficiency of AHP/DEA-AR (다중회귀분석을 이용한 AHP/DEA-AR 항만효율성 측정결과의 실증적 검증소고)

  • Park, Ro-kyung
    • Journal of Korea Port Economic Association
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    • v.32 no.4
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    • pp.73-87
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    • 2016
  • The purpose of this study is to investigate the empirical results of Analytic Hierarchy Process/Data Envelopment Analysis-Assurance Region(AHP/DEA-AR) by using multiple regression analysis during the period of 2009-2012 with 5 inputs (number of gantry cranes, number of berth, berth length, terminal yard, and mean depth) and 2 outputs (container TEU, and number of direct calling shipping companies). Assurance Region(AR) is the most important tool to measure the efficiency of seaports, because individual seaports are characterized in terms of inputs and outputs. Traditional AHP and multiple regression analysis techniques have been used for measuring the AR. However, few previous studies exist in the field of seaport efficiency measurement. The main empirical results of this study are as follows. First, the efficiency ranking comparison between the two models (AHP/DEA-AR and multiple regression) using the Wilcoxon signed-rank test and Mann-Whitney signed-rank sum test were matched with the average level of 84.5 % and 96.3% respectively. When data for four years are used, the ratios of the significant probability are decreased to 61.4% and 92.5%. The policy implication of this study is that the policy planners of Korean port should introduce AHP/DEA-AR and multiple regression analysis when they measure the seaport efficiency and consider the port investment for enhancing the efficiency of inputs and outputs. The next study will deal with the subjects introducing the Fuzzy method, non-radial DEA, and the mixed analysis between AHP/DEA-AR and multiple regression analysis.

A Study on Containerports Clustering Using Artificial Neural Network(Multilayer Perceptron and Radial Basis Function), Social Network, and Tabu Search Models with Empirical Verification of Clustering Using the Second Stage(Type IV) Cross-Efficiency Matrix Clustering Model (인공신경망모형(다층퍼셉트론, 방사형기저함수), 사회연결망모형, 타부서치모형을 이용한 컨테이너항만의 클러스터링 측정 및 2단계(Type IV) 교차효율성 메트릭스 군집모형을 이용한 실증적 검증에 관한 연구)

  • Park, Ro-Kyung
    • Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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    • v.9 no.6
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    • pp.757-772
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    • 2019
  • The purpose of this paper is to measure the clustering change and analyze empirical results, and choose the clustering ports for Busan, Incheon, and Gwangyang ports by using Artificial Neural Network, Social Network, and Tabu Search models on 38 Asian container ports over the period 2007-2016. The models consider number of cranes, depth, birth length, and total area as inputs and container throughput as output. Followings are the main empirical results. First, the variables ranking order which affects the clustering according to artificial neural network are TEU, birth length, depth, total area, and number of cranes. Second, social network analysis shows the same clustering in the benevolent and aggressive models. Third, the efficiency of domestic ports are worsened after clustering using social network analysis and tabu search models. Forth, social network and tabu search models can increase the efficiency by 37% compared to that of the general CCR model. Fifth, according to the social network analysis and tabu search models, 3 Korean ports could be clustered with Asian ports like Busan Port(Kobe, Osaka, Port Klang, Tanjung Pelepas, and Manila), Incheon Port(Shahid Rajaee, and Gwangyang), and Gwangyang Port(Aqaba, Port Sulatan Qaboos, Dammam, Khor Fakkan, and Incheon). Korean seaport authority should introduce port improvement plans by using the methods used in this paper.