Search results for "Frontier"
showing 10 items of 145 documents
A survey on handling computationally expensive multiobjective optimization problems using surrogates: non-nature inspired methods
2015
Computationally expensive multiobjective optimization problems arise, e.g. in many engineering applications, where several conflicting objectives are to be optimized simultaneously while satisfying constraints. In many cases, the lack of explicit mathematical formulas of the objectives and constraints may necessitate conducting computationally expensive and time-consuming experiments and/or simulations. As another challenge, these problems may have either convex or nonconvex or even disconnected Pareto frontier consisting of Pareto optimal solutions. Because of the existence of many such solutions, typically, a decision maker is required to select the most preferred one. In order to deal wi…
Observations Regarding Choice Behaviour in Interactive Multiple Criteria Decision-Making Environments: An Experimental Investigation
1989
Many interactive procedures have been developed for solving optimization problems having multiple criteria. In such procedures, an exploration over the feasible or efficient region is conducted for locating the most preferred solution. As Steuer (1986) notes, interactive procedures are characterized by phases of decision-making alternating with phases of computation. Generally a pattern is established that we keep repeating until termination. At each iteration, a solution, or group of solutions, is generated for a decision-maker’s (DM’s) examination. Based on the examination, the DM inputs information to the solution procedure in the form of tradeoffs, pairwise comparisons, aspiration level…
Introduzione a Il Mediterraneo, per una geografia critica della frontiera
2019
Il Mediterraneo è diventato sempre più un simbolo delle migrazioni; un confine allo stesso tempo fragile e invalicabile L’appiattimento del nesso tra confini e migrazioni, da una parte, ha impedito di mettere in primo piano la complessità dello spazio di frontiera mediterraneo; dall’altra, l’inasprimento del regime di controllo della mobilità nell’UE ha avuto forti ripercussioni sull’articolazione del discorso relativo alle frontiere e al loro attraversamento. La sessione è articolata in tre panel: Ripensare il Mediterraneo come borderscape; Il Mediterraneo come frontiera delocalizzata: esternalizzazione e internalizzazione della gestione delle migrazioni; E l’Europa disumanizzò se stessa. …
Disentangling Tax Evasion from Inefficiency in Firms Tax Declaration: An Integrated Approach
2019
In this article we present a new methodology to support fiscal monitoring by the Italian Revenue Agency (IRA) with the aim of improving current taxpayers fiscal compliance and fighting tax evasion within small and medium enterprises. In fact, given the methodology behind the Sector Studies (Studi di Settore - SdS) system, there is room for firms to implement tax evasion strategies by simply adjusting revenues (and costs) toward an estimated average threshold (known ex-ante), the so called "presumptive" revenues, and achieving the fiscal "congruity" status. By estimating a production function through stochastic frontier analysis we avoid estimating the average threshold know ex-ante and can …
Temporary employment and technical efficiency in Spain
2004
Analyses how the high proportion of temporary employment affects the firm's technical efficiency. Uses the stochastic frontier approach to measure the technical efficiency of the Spanish manufacturing firms during the period 1990‐2001. A negative relation between technical efficiency and the proportion of temporary jobs has been obtained. Also, shows that permanent employment makes an important contribution to output while temporary does not.
The Inner Border: Edward Hopper’s Reimagining the Frontier
2020
International audience
RUANG BERUBAH BERSAMA-SAMA: ANTROPOLOGI DALAM TRANSFORMASI SOSIAL BUDAYA PAPUA
2018
Abstra k The biggest challenge of anthropology, especially in frontier areas (front lines) like in Papua, is to place it in the context of the vortex of the meaning of socio-cultural transformation experienced by humans themselves. Anthropology, thus becoming a "weapon" in the face of the inevitable social and cultural changes. This article reflects the power of ethnography in the long span of the journey of reproducing Papuan cultural knowledge. This study argues that ethnographic reproduction produced with a colonialistic perspective will lack power and language in describing the complexity and transformation of culture in the Land of Papua. The reality of the Papuan people is high mobili…
A bargaining model of Farrell inefficiency
1998
Abstract An enormous number of empirical papers have estimated technical efficiency, the distance of firms inside a frontier, following the model of Farrell (Farrell, 1957. The measurement of productive efficiency. Journal of the Royal Statistical Society Series A 120 (3), 253–290). We propose a theory that explains the distance these empirical papers seek to measure. The theory is based on the idea that workers can bargain low `effort' (high crew sizes etc.) if they and the firm have some monopoly power. We provide simple theoretical expressions for the empirical measures of technical and allocative efficiency and compare them to those in the statistical literature. We also consider the re…
Drivers of productivity change: a comparison of English and Welsh water only and water and sewerage companies
2021
In regulated industries, such as the water industry, it is of great significance to estimate productivity change as it helps policy makers to evaluate the effectiveness of regulatory regime and ind...
Innovation for climate change adaptation and technical efficiency: an empirical analysis in the European agricultural sector
2020
This paper analyses the effect of innovation on firms' technical efficiency. Using climate-related patent data to proxy for innovation activity in different technological fields, the paper employs a stochastic frontier approach to estimate the impact of innovative efforts on agricultural firms' technical efficiency taking account of both unobservable heterogeneity and double heteroscedasticity in the inefficiency and idiosyncratic terms. Our findings confirm that innovation has a positive impact on firms' productivity (technical efficiency). While agricultural firms located in Germany and Sweden are more efficient compared to those in southern countries, all the European countries considere…