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Items from 1 to 20 out of 189 results

article

Quality of life in chronic conditions using patient-reported measures and biomarkers: a DEA analysis in type 1 diabetes

Sixten Borg, Ulf-G. Gerdtham, Katarina Eeg-Olofsson, Bo Palaszewski, more

Health Economics Review > 2019 > 9 > 1 > 1-17

Background A chronic disease impacts a patient’s daily life, with the burden of symptoms and managing the condition, and concerns of progression and disease complications. Such aspects are captured by Patient-Reported Outcomes Measures (PROM), assessments of e.g. wellbeing. Patient-Reported Experience Measures (PREM) assess patients’ experiences of healthcare and address patient preferences. Biomarkers...

article

Identification of Outliers in Data Envelopment Analysis

Marcel Clermont, Julia Schaefer

Schmalenbach Business Review > 2019 > 71 > 4 > 475-496

Data Envelopment Analysis (DEA) is a deterministic method for the aggregation of multidimensional measures and subsequent efficiency analysis. Due to its inherent determinism, however, it reacts sensitively to outliers in datasets. Existing methods for identifying such outliers have two main disadvantages. First, from a more conceptional point of view, a uniform definition of an outlier is missing...

article

Disaggregation for efficiency analysis

Barnabé Walheer

Journal of Productivity Analysis > 2019 > 51 > 2-3 > 137-151

Efficiency analysis is a popular technique used to compare the performances of Decision Making Units (DMUs). Procedures to aggregate DMU-level efficiency and related efficiency concepts to obtain group-specific counterparts have been proposed recently. In this paper, we suggest procedures for the opposite direction: disaggregate DMU-level efficiency and related efficiency concepts into output-specific...

article

Influence of Deformation, Mass Transfer, and Heating on Pump Compression

V. E. Shcherba, V. V. Shalai, A. Yu. Kondyurin, A. Yu. Ovsyannikov, more

Russian Engineering Research > 2019 > 39 > 1 > 1-5

Compression of the working fluid in bulk-action pumps (such as piston, gear-driven, and plate-type pumps) under the action of deformation, mass transfer, and heating is considered. A method of calculating the compression is developed, for each factor and for the combination of deformation and mass transfer. The effectiveness of compression is analyzed for each case.

article

Measuring the efficiency of European education systems by combining Data Envelopment Analysis and Multiple-Criteria Evaluation

Tommaso Agasisti, Giuseppe Munda, Ralph Hippe

Journal of Productivity Analysis > 2019 > 51 > 2-3 > 105-124

Education is considered an important factor of economic growth, employment and social inclusion. However, the economic crisis has put the need to achieve educational goals in the most efficient way ever more to the fore. The main objective of this paper is to assess the spending efficiency of European compulsory educational systems, creating a ranking of countries based on the efficiency scores of...

article

Financial efficiency analysis of PV plants in Poland under the evolving support scheme

Anna Dubel, Mariusz Trela

Ekonomia i Środowisko > 2019 > nr 4 > 38--55

Financial efficiency analysis of PV plants with a capacity of 1 MWp is presented in the paper, taking into account two RES-E support schemes, which have been implemented in Poland. The aim of the paper is to analyze how the RES-E support mechanisms for Poland impact the actual investor's financial results. The compared RES-E support mechanisms are the following: the auction system (an option of a...

article

A network DEA aeronautical and non-aeronautical production model: an application to South Korea airports

Myung Je Lee, Changhee Kim

Journal of Economic Structures > 2018 > 7 > 1 > 1-12

This study evaluates the overall efficiency of aeronautical and non-aeronautical production process. Moreover, it investigates the each stage efficiency using network data envelopment analysis and compares the results with tradition DEA to find out the causes of inefficiency and analyze its stage in detail. The framework for assessing the airports’ performance was devised to capture the trend of airport...

article

Stochastic non-smooth envelopment of data for multi-dimensional output

Julia Schaefer, Marcel Clermont

Journal of Productivity Analysis > 2018 > 50 > 3 > 139-154

The proposed method of Stochastic Non-smooth Envelopment of Data (StoNED) for measuring efficiency has to date mainly found application in the analysis of production systems which have exactly one output. Therefore, the objective of this paper is to examine the applicability of StoNED when a ray production function models a production technology with multi-dimensional input and output. In addition...

article

Thermodynamic efficiency analysis of zinc oxide based solar driven thermochemical H2O splitting cycle: Effect of partial pressure of O2, thermal reduction and H2O splitting temperatures

Rahul R. Bhosale

International Journal of Hydrogen Energy > 2018 > 43 > 32 > 14915- 14924

In this paper, the thermodynamic efficiency analysis of ZnO-based solar-driven thermochemical H₂O splitting cycle is performed and compared with the SnO₂-based H₂O splitting cycle. The HSC Chemistry 7.1 software is used for this analysis and effects of thermal reduction (TH) and water splitting temperature (TL) on various thermodynamic parameters associated with the ZnO-based H₂O splitting cycle are...

article

Improve the efficiency of the service process as a result of the Muda ideology

A. Lorenc, K. Przyłuski

Management Systems in Production Engineering > 2018 > nr 2 (26) > 112--118

The aim of the paper was to improve service processes carried out by Knorr-Bremse Systemy Kolejowe Polska sp. z o.o. Particularly, emphasise unnecessary movements and physical efforts of employees. The indirect goal was to find a solution in the simplest possible way using the Muda ideology. In order to improve the service process at the beginning was executed the process mapping for the devices to...

article

Efficiency Analysis of a Cycloid Reducer Considering Tolerance

Anh-Duc Pham, Hyeong-Joon Ahn

Journal of Friction and Wear > 2017 > 38 > 6 > 490-496

High precision reducers such as cycloid reducers have been used to meet the mechanical system requirements of industrial robots for advantages such as: high reduction ratio, large torque capability, and high efficiency. Although efficiency of reducers is one of important performances, there are few studies on efficiency of a cycloid reducer considering its tolerance. This paper presents efficiency...

article

Efficiency analysis of utilizing phase change materials as grout for a vertical U-tube heat exchanger coupled ground source heat pump system

Fei Chen, Jinfeng Mao, Shangyuan Chen, Chaofeng Li, more

Applied Thermal Engineering > 2018 > 130 > C > 698-709

To study the effects of using phase change materials (PCMs) as grout on the efficiency of a ground source heat pump (GSHP) system, a numerical GSHP system model was established in this study, considering both the site conditions and dynamically changing loads regulated by the heat pump. First, system efficiencies of using an ordinary grout and two other PCM grouts were investigated and compared. Second,...

article

Nonisolated High Gain DC–DC Converter for DC Microgrids

M. Lakshmi, S. Hemamalini

IEEE Transactions on Industrial Electronics > 2018 > 65 > 2 > 1205 - 1212

DC microgrids are popular due to the integration of renewable energy sources such as solar photovoltaics and fuel cells. Owing to the low output voltage of these dc power generators, high efficient high gain dc–dc converters are in need to connect the dc microgrid. In this paper, a nonisolated high gain dc–dc converter is proposed without using the voltage multiplier cell and/or hybrid switched-capacitor...

article

Sensitivity analysis of magnetic field measurements for magnetic resonance electrical impedance tomography (MREIT)

Cihan Göksu, Klaus Scheffler, Philipp Ehses, Lars G. Hanson, more

Magnetic Resonance in Medicine > 79 > 2 > 748 - 760

Purpose Clinical use of magnetic resonance electrical impedance tomography (MREIT) still requires significant sensitivity improvements. Here, the measurement of the current‐induced magnetic field (ΔB_z,c) is improved using systematic efficiency analyses and optimization of multi‐echo spin echo (MESE) and steady‐state free precession free induction decay (SSFP‐FID) sequences. Theory and Methods Considering...

article

Analiza skuteczności wykorzystania sorbentów do pochłaniania par wybranych olejów napędowych w działaniach ratowniczych

B. Kukfisz

Autobusy : technika, eksploatacja, systemy transportowe > 2018 > R. 19, nr 6 > 133--137, CD

W pracy porównane zostały paliwa pod kątem ich wpływu na środowisko na podstawie źródeł literaturowych. Porównanie to miało wykazać zalety stosowania paliw alternatywnych w stosunku do ich konwencjonalnych odpowiedników. Przedstawiona została klasyfikacja oraz kryteria doboru sorbentów w działaniach ratowniczo-gaśniczych Państwowej Straży Pożarnej. Przedstawiono analizę zdolności pochłaniania par...

article

Target intermediate products setting in a two-stage system with fairness concern

Qingxian An, Haoxun Chen, Beibei Xiong, Jie Wu, more

Omega > 2017 > 73 > C > 49-59

In a two-stage system with two divisions connected in series, fairly setting the target outputs for the first stage or equivalently the target inputs for the second stage is critical, in order to ensure that the two stages have incentives to collaborate with each other to achieve the best performance of the whole system. Data envelopment analysis (DEA) as a non-parametric approach for efficiency evaluation...

article

Comparing Single- and Multichannel Distribution Strategies in the German Life Insurance Market: An Analysis of Cost and Profit Efficiency

Lucinda Trigo-Gamarra, Christian Growitsch

Schmalenbach Business Review > 2010 > 62 > 4 > 401-417

To explain the success of different distribution strategies in the life insurance industry, we analyze the performance of single- and multichannel distribution firms in the german life insurance industry. We estimate cost and profit efficiency for three groups of life insurers: multichannel insurers, direct insurers, and independent agent insurers. We use nonparametric data envelopment analysis to...

article

Modeling joint production of multiple outputs in StoNED: Directional distance function approach

Timo Kuosmanen, Andrew Johnson

European Journal of Operational Research > 2017 > 262 > 2 > 792-801

Estimation of joint production technologies involving multiple outputs has proved a vexing challenge. Existing methods are unsatisfactory as they either assume away stochastic noise or restrict to functional forms that have incorrect output curvature. The first contribution of this paper is to develop a new probabilistic data generating process that is compatible with the directional distance function...

article

Have regulatory reforms improved the efficiency levels of the Japanese electricity distribution sector? A cost metafrontier-based analysis

Hong-Zhou Li, Maria Kopsakangas-Savolainen, Xing-Zhi Xiao, Sim-Yee Lau

Energy Policy > 2017 > 108 > C > 606-616

In order to identify the kinds of impacts that Japanese regulatory reforms in the electric power industry have had on the efficiency levels of the electrical distribution sector, the present study assembles a dataset which spans both pre- and post-regulation periods. Further, to make the estimated efficiency scores from the two sub-periods comparable, the study applies metafrontier frameworks proposed...

article

A comparison of micro gas turbine operation modes for optimal efficiency based on a nonlinear model

Jiandong Duan, Shaogui Fan, Quntao An, Li Sun, more

Energy > 2017 > 134 > C > 400-411

The novel contribution of this paper is that Micro gas turbine (MGT) operation modes for optimal efficiency are compared based on a nonlinear model, and the variable-speed control is proposed for optimal efficiency. The nonlinear mathematical MGT model is established based on thermodynamic analysis, which can completely reflect the MGT operational characteristics. When the air flow rate is fixed,...

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Search results

Quality of life in chronic conditions using patient-reported measures and biomarkers: a DEA analysis in type 1 diabetes

Identification of Outliers in Data Envelopment Analysis

Disaggregation for efficiency analysis

Influence of Deformation, Mass Transfer, and Heating on Pump Compression

Measuring the efficiency of European education systems by combining Data Envelopment Analysis and Multiple-Criteria Evaluation

Financial efficiency analysis of PV plants in Poland under the evolving support scheme

A network DEA aeronautical and non-aeronautical production model: an application to South Korea airports

Stochastic non-smooth envelopment of data for multi-dimensional output

Thermodynamic efficiency analysis of zinc oxide based solar driven thermochemical H2O splitting cycle: Effect of partial pressure of O2, thermal reduction and H2O splitting temperatures

Improve the efficiency of the service process as a result of the Muda ideology

Efficiency Analysis of a Cycloid Reducer Considering Tolerance

Efficiency analysis of utilizing phase change materials as grout for a vertical U-tube heat exchanger coupled ground source heat pump system

Nonisolated High Gain DC–DC Converter for DC Microgrids

Sensitivity analysis of magnetic field measurements for magnetic resonance electrical impedance tomography (MREIT)

Analiza skuteczności wykorzystania sorbentów do pochłaniania par wybranych olejów napędowych w działaniach ratowniczych

Target intermediate products setting in a two-stage system with fairness concern

Comparing Single- and Multichannel Distribution Strategies in the German Life Insurance Market: An Analysis of Cost and Profit Efficiency

Modeling joint production of multiple outputs in StoNED: Directional distance function approach

Have regulatory reforms improved the efficiency levels of the Japanese electricity distribution sector? A cost metafrontier-based analysis

A comparison of micro gas turbine operation modes for optimal efficiency based on a nonlinear model

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