2015
Autores
Zanella, A; Camanho, AS; Dias, TG;
Publicação
EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
Abstract
This paper discusses different models that can be used to construct composite indicators with both desirable and undesirable output indicators. Two approaches are considered. The first is an indirect approach, based on a traditional Data Envelopment Analysis model, requiring a prior transformation in the measurement scale of the undesirable outputs. The second is a direct approach, based on a directional distance function model. The use of a directional distance function allows for the accommodation of undesirable indicators in their original form. The main limitations of these approaches are discussed related to the data transformation in the case of the indirect approach and the possibility to obtain negative margin rates of substitution between the desirable and undesirable outputs in the case of the direct approach. These issues lead to the proposal of a new composite indicator model based on a directional distance function that overcomes the limitations associated with the existing approaches. The incorporation of information on the relative importance of individual indicators using weight restrictions is discussed. Proposed here is an enhanced formulation of weight restrictions, in the form of assurance regions type I, that reflects the relative importance of the indicators in percentage terms. The models are illustrated in the assessment of Brazilian hydropower plants and are suitable for any assessment involving the aggregation of key performance indicators whenever undesirable outputs are present.
2015
Autores
Coelho, J; Vanhoucke, M;
Publicação
Handbook on Project Management and Scheduling Vol. 1
Abstract
This chapter reports on a new solution approach for the multi-mode resource-constrained project scheduling problem (MRCPSP, MPS|jprec|Cmax). This problem type aims at the selection of a single activity mode from a set of available modes in order to construct a precedence and a (renewable and nonrenewable) resource-feasible project schedule with a minimal makespan. The problem type is known to be N P-hard and has been solved using various exact as well as (meta-)heuristic procedures. The new algorithm splits the problem type into a mode assignment and a single mode project scheduling step. The mode assignment step is solved by a satisfiability (SAT) problem solver and returns a feasible mode selection to the project scheduling step. The project scheduling step is solved using an efficient meta-heuristic procedure from literature to solve the resourceconstrained project scheduling problem (RCPSP). However, unlike many traditional meta-heuristic methods in literature to solve the MRCPSP, the new approach executes these two steps in one run, relying on a single priority list. Straightforward adaptations to the pure SAT solver by using pseudo boolean nonrenewable resourceconstraints has led to a high quality solution approach in a reasonable computational time. Computational results show that the procedure can report similar or sometimes even better solutions than found by other procedures in literature, although it often requires a higher CPU time. © Springer International Publishing Switzerland 2015.
2015
Autores
Neyestani, N; Damavandi, MY; Catalao, JPS;
Publicação
IEEE EUROCON 2015 - INTERNATIONAL CONFERENCE ON COMPUTER AS A TOOL (EUROCON)
Abstract
In this paper, an innovative bi-level model is developed for the interactions of the plug-in electric vehicle (PEV) parking lot (PL) with the upstream markets through an aggregator in the system. The preferences of the PEVs on using the PL are also considered in the study. The PEVs have a choice in participating in grid-to-vehicle or vehicle-to-grid modes with fixed or flexible amount of departed state of charge (SOC). The PL assigns various tariffs for different requirements of the PEVs. In this study, the mutual effect of the variation of PEV tariffs and the PL's behavior in the market is investigated. It is shown that the preferences of PEVs can significantly affect the PL's strategy. The changes of the equilibrium prices for PL and aggregator interaction are thoroughly analyzed in response to changes in PEV tariffs to illustrate their influence on their behavior.
2015
Autores
Teixeira A.A.C.; Pimenta C.; Maia A.; Moreira J.A.;
Publicação
Corruption Economic Growth and Globalization
Abstract
Corruption is increasingly placed on top of the agenda of national governments and supra national institutions, such as the OECD, UN or the World Bank. A necessary condition for promoting sustainable economic growth is the pre-existence of a stable political system which is able to control corruption. Corruption, however, is a very complex issue, associated with institutional and cultural specificities, personality traits related to individualistic values, and criminal personalities. In this book the social, political and economic realities that prevail in particular settings are viewed from an interdisciplinary, multidimensional, and a multi country perspective. This book is divided into three parts. The first part presents a comprehensive, theoretical and empirical framework of corruption with an overview of literature on economic growth and corruption. Part two, encompasses the in-depth analysis of several countries, ranging from middle corrupted contexts like Portugal, to highly corrupted countries including Serbia, Russia, Thailand and China- the latter viewed from the perspective of firms from a very low corruption country such as Finland. The final part explores the prevention and control of corruption, looking at the public sector in Thailand and fighting corruption with different strategies. This volume is of the interest of those who study international economics, development economics or organised crime.
2015
Autores
Ferreira, N; Dias, D; Vilas-Boas, C; Fonseca, I; Coelho, T;
Publicação
Orphanet Journal of Rare Diseases
Abstract
2015
Autores
Dantas, JGL; Moreira, AC; Valente, FM;
Publicação
Handbook of Research on Internationalization of Entrepreneurial Innovation in the Global Economy
Abstract
The direct relationship between national cultural practice and entrepreneurship activities is analyzed in this chapter, based on the analysis of 44 countries. Datasets from 2012 and 2013 Global Entrepreneurship Monitor (GEM) report are used to characterize three types of entrepreneurship: Early-Stage entrepreneurial activity (TEA); Necessity-Driven entrepreneurship (NDE) and Opportunity-Driven (ODE) entrepreneurship. Data sets on national cultural values are used to analyze five dimensions of Hofstede's work on cultural values (power distance, individualism/collectivism, masculinity/femininity, long/short term orientation, and uncertainty avoidance). For that, the authors use the Values Survey Module 2013, which has been adapted from Hofstede's previous work from 2010 and 2008. The main conclusion is that the three types of entrepreneurship analyzed in this chapter are differently explained by the cultural and expanded models. If the country of origin and the type of economy are useful to explain TEA, they are of no added value to explain Necessity-Driven or opportunity-driven entrepreneurship.
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