the objective of this paper is to determine the efficiency of manufacturing companies in kenya over the period of 2009 to 2011 as well as suggesting appropriate policies to be employed by the manufacturing companies in kenya based on the findings of the study. three critical inputs variables (raw materials, staff expenses and plant and machinery) and two output variables (net sale and earnings ...

one of the most applicable methods to measure efficiency is using data envelopment analysis (dea) models. dea measures efficiency for some homogenous units (units with the same inputs and outputs) and determines efficient and non-efficient units. since the evaluated efficiency for each unit is a relative value, it is clear that each unit tries to improve its performance and preserve (or even im...

In this paper, exergy of conditioned air, exergy efficiency, irreversibility, and entropy generation of common models of evaporative cooling have been investigated in five cities of Iran. Direct evaporative cooling (DEC), indirect evaporative cooling (IEC), and two-stage IEC/DEC as the most popular methods of cooling have been modeled. Atmospheric conditions are considered as the dead state of ...

A semi-analytic method, based on scattering approach is applied to analyze the finite size photonic crystal cavities surrounded by cylindrical dielectric rods. The resonant frequency and the quality factor (Q) are determined by this method. Also, with a source at the center of the cavity, field and energy distribution can be obtained at different frequencies. The algorithm is simple to simulate...

Data Envelopment Analysis (DEA) is a nonparametric approach for measuring the relative efficiency of a decision making units consists of multiple inputs and outputs. In all standard DEA models semi positive real valued measures are assumed, while in some real cases inputs and outputs may take complex valued. The question is related to measuring efficiency in such cases. As far as we are aware, ...