The utilization of networked, shared, heterogeneous workstations as an inexpensive parallel computation platform is an appealing concept that has received quite a bit of attention in the literature. However, most e ciency measures for parallel computation are oriented towards the use of tightly-coupled, dedicated, homogeneous processors. We propose a new e ciency measure for parallel computatio...

This paper addresses a fundamental, yet unresolved, question: is statistical discrimination a market failure? I contrast a competitive model of statistical discrimination with the allocation chosen by a social planner who must respect the same informational and technological constraints as the rms in the decentralized model. Equilibria are always contrained ine cient due to \free riding" in hum...

—Recently it was shown that Shannon entropy is more Bahadur ef cient than any Rényi entropy of order > 1: In this paper we shall show that relative Bahadur ef ciency between any two Rényi entropies of orders 2 ]0; 1] is 1 when the relative Bahadur ef ciency is de ned according to [1]. Despite the fact that the relative Bahadur ef ciency is 1 it is shown that in a certain sense Shannon entropy i...

The thesis comprises two parts: the rst part presents channel-adaptive techniques to achieve high spectral e ciency in a single user multiple-input multiple-output (MIMO) system; the second part exhibits a programmable and recon gurable software-de ned-radio workbench (SDR-WB) in the Matlab/Octave environment that accommodates a variety of wireless applications. In an attempt to achieve high sp...

The objective of this study was to analyze the scientifi c production on health interventions related to hygiene for adults with HIV/ AIDS. An integrative literature review was performed using six databases in June 2013. The descriptors AIDS and Hygiene were used, in Portuguese, English or Spanish. A total of 682 articles were found and 16 were selected. Personal hygiene practices were identifi...

The key element in realizing low cost real{time software implementations of a H.263 videoconferencing system is a fast motion estimation algorithm, which only slightly decreases coding e ciency. We propose a spatio{temporal recursive estimator that combines an excellent coding e ciency with a high computational e ciency. Experimentally, the new algorithm proves to be comparable to full{search b...

This paper uses data on the world’s copper mining industry to measure the impact on e¢ ciency of the adoption of the ISO 14001 environmental standard. Anecdotal and case study literature suggests that …rms are motivated to adopt this standard so as to achieve greater e¢ ciency through changes in operating procedures and processes. Using plant level panel data from 19922007 on most of the world’...

I consider the problem of allocating N indivisible objects among N agents according to their preferences when transfers are absent and an outside option may exist. I study the tradeo between fairness and e ciency in the class of strategy-proof mechanisms. The main nding is that for strategy-proof mechanisms the following e ciency and fairness criteria are mutually incompatible: (1) ex-post e ci...

Th e electricity generating effi ciency is the energy in the net electricity generated divided by the energy in the fuel used to generate that electricity on an all-in basis. Higher effi ciency means less coal consumed and reduced emissions per unit of electricity. Th e chemical energy in the fuel can be expressed as either its Lower Heating Value (LHV) or its Higher Heating Value (HHV) [5]. In...

This paper discusses and reviews the use of super-eciency approach in data envelopment analysis (DEA) sensitivity analyses. It is shown that super-eciency score can be decomposed into two data perturbation components of a particular test frontier decision making unit (DMU) and the remaining DMUs. As a result, DEA sensitivity analysis can be done in (1) a general situation where data for a tes...