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The risk-incentive trade-off in competitive search

Onuchic, Paula Ferreira
Fonte: Fundação Getúlio Vargas Publicador: Fundação Getúlio Vargas
Tipo: Dissertação
Português
Relevância na Pesquisa
45.94%
Usando a abordagem de competitive search, modelo um mercado de trabalho com trabalhadores heterogêneos no qual há um problema de risco moral na relação entre firmas e trabalhadores. Nesse contexto, consigo prever como contratos reagem a mudanças nos parâmetros do mercado (em particular, o risco de produção), assim como a variação da probabilidade dos trabalhadores serem contratados. Minha contribuição principal é ver que, no nível individual, existe uma relação negativa entre risco e incentivos, mas efeitos de equilíbrio geral implicam que essa relação pode ser positiva no nível agregado. Esse resultado ajuda a esclarecer resultados empíricos contraditórios sobre a relação entre risco e incentivos.; I use the competitive search framework to model a job market with heterogeneous workers in which there is a moral hazard problem in the employer-worker relation. In this setting, I can predict how contracts react to changes in underlying parameters of the market (in particular, the production risk), as well as how the probability of each type of worker being hired responds. My main finding is that while at the individual level there is a negative risk- incentive trade-off, general equilibrium effects imply that the effect can be positive at the aggregate level depending on the market search frictions and the distribution of types. My re- sults help shed some light on some puzzling empirical findings on the risk-incentives trade-off.

Interesses profissionais de jovens de ensino médio: estudo correlacional entre a escala de aconselhamento profissional e o self-directed search carrier explorer

Sartori,Fernanda Argentini; Noronha,Ana Paula Porto; Godoy,Silvia; Ambiel,Rodolfo Augusto Matteo
Fonte: Programa de Pós-Graduação em Psicologia, Pontifícia Universidade Católica de Campinas Publicador: Programa de Pós-Graduação em Psicologia, Pontifícia Universidade Católica de Campinas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2010 Português
Relevância na Pesquisa
46.16%
O estudo de instrumentos de avaliação psicológica no contexto de orientação profissional é de fundamental importância, pois favorece maior confiabilidade e enriquecimento da interpretação dos resultados. A presente pesquisa objetivou explorar as correlações entre as dimensões da Escala de Aconselhamento Profissional e as seções Competências, Carreiras e Habilidades do Self-Directed Search Career Explorer. A Escala de Aconselhamento Profissional é um instrumento que avalia as preferências por atividades profissionais e o Self-Directed Search Career Explorer traça o perfil tipológico dos interesses dos indivíduos. Participaram do estudo 132 estudantes (54,5% mulheres), com idade média de 15,9 anos, que cursavam o ensino médio de escolas particulares do interior paulista. Os resultados apresentaram correlações significativas (p<0,05) entre alguns tipos do Self-Directed Search Career Explorer e dimensões da Escala de Aconselhamento Profissional teoricamente relacionadas, tais como tipo Artístico com a dimensão Artes e Comunicação. Outras pesquisas devem ser desenvolvidas a fim de contribuir com estudos de outros instrumentos.

Estudo correlacional do inventário de busca auto dirigida (self-directed search) com o IFP

Primi,Ricardo; Moggi,Melissa Aparecida; Casellato,Érica Oliveira
Fonte: Associação Brasileira de Psicologia Escolar e Educacional (ABRAPEE) Publicador: Associação Brasileira de Psicologia Escolar e Educacional (ABRAPEE)
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2004 Português
Relevância na Pesquisa
45.94%
Este estudo investigou as correlações da versão brasileira do Self-Directed Search (SDS) de John L. Holland, com o Inventário Fatorial de Personalidade (IFP) avaliando um conjunto de necessidades conceituadas por Henrry Murray. O estudo foi realizado com 81 adolescentes, 76,8% mulheres a maioria com 16-17 anos que participavam de um programa de orientação profissional. Os coeficientes de consistência interna das escalas do SDS estiveram entre 0,86 a 0,94. As correlações significativas situaram-se entre os 0,22 a 0,39 e foram observadas entre o Tipo R com Heterossexualidade, O Tipo I com Exibição e Desabilidade; Tipo A com Assistência, Intracepção, Deferência e Afiliação; Tipo S com Assistência, Intracepção, Desejabilidade e correlação negativa com Agressão; Tipo E com Dominância, Desempenho, Exibição, Agressão, Autonomia, Heterossexualide e correlação negativa com Ordem; e Tipo C com Persistência. Estes resultados foram discutidos fazendo referência à precisão e validade do SDS.

Identification of ςB-Dependent Genes in Bacillus subtilis Using a Promoter Consensus-Directed Search and Oligonucleotide Hybridization

Petersohn, Anja; Bernhardt, Jörg; Gerth, Ulf; Höper, Dirk; Koburger, Torsten; Völker, Uwe; Hecker, Michael
Fonte: American Society for Microbiology Publicador: American Society for Microbiology
Tipo: Artigo de Revista Científica
Publicado em /09/1999 Português
Relevância na Pesquisa
45.94%
A consensus-directed search for ςB promoters was used to locate potential candidates for new ςB-dependent genes in Bacillus subtilis. Screening of those candidates by oligonucleotide hybridizations with total RNA from exponentially growing or ethanol-stressed cells of the wild type as well as a sigB mutant revealed 22 genes that required ςB for induction by ethanol. Although almost 50% of the proteins encoded by the newly discovered ςB-dependent stress genes seem to be membrane localized, biochemical functions have so far not been defined for any of the gene products. Allocation of the genes to the ςB-dependent stress regulon may indicate a potential function in the establishment of a multiple stress resistance. AldY and YhdF show similarities to NAD(P)-dependent dehydrogenases and YdbP to thioredoxins, supporting our suggestion that ςB-dependent proteins may be involved in the maintenance of the intracellular redox balance after stress.

Directed unfolding: reachability analysis of concurrent systems & applications to automated planning.

Hickmott, Sarah Louise
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2008 Português
Relevância na Pesquisa
36.18%
The factored state representation and concurrency semantics of Petri nets are closely related to those of classical planning models, yet automated planning and Petri net analysis have developed independently, with minimal and mainly unconvincing attempts at crossfertilisation. This thesis exploits the relationship between the formal reachability problem, and the automated planning problem, via Petri net unfolding, which is an attractive reachability analysis method for highly concurrent systems as it facilitates reasoning about independent sub-problems. The first contribution of this thesis is the theory of directed unfolding: controlling the unfolding process with informative strategies, for the purpose of optimality and increased efficiency. The second contribution is the application of directed unfolding to automated planning. Inspired by well-known planning heuristics, this thesis shows how problem specific information can be employed to guide unfolding, in response to the formal problem of developing efficient, directed reachability analysis methods for concurrent systems. Complimenting this theoretical work, this thesis presents a new forward search method for partial order planning which can be exponentially more efficient than state space search. Our suite of planners based on directed unfolding can perform optimal and suboptimal classical planning subject to arbitrary action costs...

Directed search and firm size

Tan, Serene Sze-Ching
Fonte: Univ Penn Publicador: Univ Penn
Tipo: Artigo de Revista Científica
Publicado em //2012 Português
Relevância na Pesquisa
46.07%
Standard directed search models predict that larger firms pay lower wages than smaller firms, contrary to the data. This article proposes one way to obtain this positive size–wage differential in a directed search setting. I posit that there is an optimal size associated with a firm: A firm suffers a penalty by not operating at its optimal size. I show that if this penalty is sufficiently large the size–wage differential will be obtained. My model also gives a new way to look at the data because it highlights the importance of the distinction between intended and realized firm sizes.; Serene Tan

Directed search for continuous gravitational waves from the galactic center

Aasi, J.; Abadie, J.; Abbott, B.P.; Abbott, R.; Abbott, T.; Abernathy, M.R.; Accadia, T.; Acernese, F.; Adams, C.; Adams, T.; Adhikari, R.X.; Affeldt, C.; Agathos, M.; Aggarwal, N.; Aguiar, O.D.; Ajith, P.; Allen, B.; Allocca, A.; Amador Ceron, E.; Amariu
Fonte: American Physical Society Publicador: American Physical Society
Tipo: Artigo de Revista Científica
Publicado em //2013 Português
Relevância na Pesquisa
46.04%
We present the results of a directed search for continuous gravitational waves from unknown, isolated neutron stars in the Galactic center region, performed on two years of data from LIGO’s fifth science run from two LIGO detectors. The search uses a semicoherent approach, analyzing coherently 630 segments, each spanning 11.5 hours, and then incoherently combining the results of the single segments. It covers gravitational wave frequencies in a range from 78 to 496 Hz and a frequency-dependent range of firstorder spindown values down to -7:86 * 10-8 Hz=s at the highest frequency. No gravitational waves were detected. The 90% confidence upper limits on the gravitational wave amplitude of sources at the Galactic center are ~3:35 * 10-25 for frequencies near 150 Hz. These upper limits are the most constraining to date for a large-parameter-space search for continuous gravitational wave signals.; J. Aasi ... D. J. Hosken ... W. Kim ... J. Munch ... D. J. Ottaway ... P. J. Veitch ... et al. (LIGO Scientific Collaboration and Virgo Collaboration)

A Theory of Commerce: Competitive Search Under Private Information

Faig, Miquel; Jerez, Belén
Fonte: Universidade Carlos III de Madrid Publicador: Universidade Carlos III de Madrid
Tipo: Trabalho em Andamento Formato: application/pdf
Publicado em //2003 Português
Relevância na Pesquisa
36%
Retail trade absorbs vast scarce resources because the physical process of trading is time con-suming, buyers match with sellers without coordination, and consumers prefer to purchase a diverse basket of goods. Sellers post prices to attract customers, but buyers care also about the expected time it takes to make a purchase. Retail prices can be non-linear due to packaging and quantity discounts. However, prices cannot depend on buyers preferences because these are private information. To capture these features, we adopt directed search and assume that sellers ignore their clients preferences. If, realistically, sellers cannot charge a ßat fee to all potential buyers, then in equilibrium the average lineup of buyers in front of a seller is inefficiently long. In contrast, the directed search equilibrium is efficient with full information. Our model is easily inserted in a Neoclassical growth framework. The retail trade sector can be calibrated using commercial margins and resources employed in that sector.

Directed search over the life cycle

Menzio, Guido; Telyukova, Irina A.; Visschers, Ludo
Fonte: Universidade Carlos III de Madrid Publicador: Universidade Carlos III de Madrid
Tipo: info:eu-repo/semantics/draft; info:eu-repo/semantics/workingPaper Formato: application/pdf
Publicado em /01/2012 Português
Relevância na Pesquisa
56.11%
We develop a life-cycle model of the labor market in which different worker-firm matches have different quality and the assignment of the right workers to the right firms is time consuming because of search and learning frictions. The rate at which workers move between unemployment, employment and across different firms is endogenous because search is directed and, hence, workers can choose whether to seek low-wage jobs that are easy to find or high-wage jobs that are hard to find. We calibrate our theory using data on labor market transitions aggregated across workers of different ages. We validate our theory by showing that it correctly predicts the pattern of labor market transitions for workers of different ages. Finally, we use our theory to decompose the age profiles of transition rates, wages and productivity into the effects of age variation in work-life expectancy, human capital and match quality.

A Theory of Commerce

Faig, Miquel; Jerez, Belén
Fonte: Elsevier Publicador: Elsevier
Tipo: info:eu-repo/semantics/acceptedVersion; info:eu-repo/semantics/article Formato: application/pdf; text/plain
Publicado em //2005 Português
Relevância na Pesquisa
46.16%
The theory of commerce advanced here captures prominent features of retail trade: large employment, congestion effects, anonymous posted prices, and quantity discounts. This theory is built around a directed search model where buyers’ preferences are private information. The analytical solution is easily inserted in a Neoclassical growth framework. In this framework, the parameters of retail trade are calibrated using commercial margins and employment. Welfare properties depend on the sellers’ ability to charge two-tier prices. With two-tier prices, the directed search equilibrium is efficient. Otherwise, it is not. This contrasts with the full information benchmark, where directed search is always efficient.; Financial support from SSHRC of Canada (Grant 410010028) and DGCYT of Spain (projects BEC2002-00642,BEC2000-01 72 and HI2001-0039) is gratefully acknowledged.

Competitive equilibrium with search frictions : a general equilibrium approach

Jerez, Belén
Fonte: Universidade Carlos III de Madrid Publicador: Universidade Carlos III de Madrid
Tipo: info:eu-repo/semantics/draft; info:eu-repo/semantics/workingPaper Formato: application/pdf
Publicado em /12/2012 Português
Relevância na Pesquisa
56.2%
When the trading process is characterized by search frictions, traders may be rationed so markets need not clear. We build a general equilibrium model with transferable utility where the uncertainty arising from rationing is incorporated in the definition of a commodity, in the spirit of the Arrow-Debreu theory. Prices of commodities then depend not only on their physical characteristics, but also on the probability that their trade is rationed. The standard definition of competitive equilibrium is extended by replacing market clearing with a matching condition which describes a trading technology that is not frictionless. This condition relates the rationing probabilities of buyers and sellers to ratio of buyers to sellers in the market via an exogenous matching function with constant returns, as in standard search-theoretic models. When search frictions vanish, our model is equivalent to the competitive assignment model of Gretsky, Ostroy and Zame (1992). We adopt their approach, which uses linear programming techniques and duality theory, to derive the welfare and existence theorems in our search environment. Our competitive equilibrium notion is equivalent to that of directed (or competitive) search. The strength of our formulation and the linear programming approach is that they allow us to generalize the constrained efficiency and existence results in the directed search literature to a much broader class of economies. Our framework also opens the door to the use of linear programming algorithms for computing equilibria; Financial support from Spanish DGCYT (projects SEJ2004-07861...

Search and Information Frictions in Decentralized Markets

Stacey, Derek
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
Português
Relevância na Pesquisa
45.98%
This thesis studies the importance and implications of information asymmetry in decentralized markets with search frictions. The first chapter provides an introduction and literature review. In the next chapter, I propose a model of the housing market using a search framework in which sellers are unable to commit to asking prices announced ex ante. Relaxing the commitment assumption prevents sellers from using price posting as a signalling device to direct buyers' search. Adverse selection and inefficient entry on the demand side then contribute to housing market illiquidity. Real estate agents that can facilitate the search process can segment the market and alleviate information frictions. In Chapter 3, I further study the importance and implications of the commitment assumptions embedded in directed search models. I eliminate commitment to take-it-or-leave-it trading mechanisms in a model of the labour market with worker heterogeneity and a matching process that allows for multiple firms to match with a single worker. When workers and firms cannot commit to ex ante offers, to an allocation rule, or to an ex post bargaining strategy, the equilibrium is necessarily inefficient. This is true for a broad class of protocols for wage determination...

Astrophysical motivation for directed searches for a stochastic gravitational wave background

Mazumder, Nairwita; Mitra, Sanjit; Dhurandhar, Sanjeev
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
36.22%
The nearby universe is expected to create an anisotropic stochastic gravitational wave background (SGWB). Different algorithms have been developed and implemented to search for isotropic and anisotropic SGWB. The aim of this paper is to quantify the advantage of an optimal anisotropic search, specifically comparing a point source with an isotropic background. Clusters of galaxies appear as point sources to a network of ground based laser interferometric detectors. The optimal search strategy for these sources is a "directed radiometer search". We show that the flux of SGWB created by the millisecond pulsars in the Virgo cluster produces a significantly stronger signal than the nearly isotropic background of unresolved sources of the same kind. We compute their strain power spectra for different cosmologies and distribution of population over redshifts. We conclude that a localised source, like the Virgo cluster, can be resolved from the isotropic background with very high significance using the directed search algorithm. For backgrounds dominated by nearby sources, up to redshift of about 3, we show that the directed search for a localised source can have signal to noise ratio more than that for the all sky integrated isotropic search.; Comment: 13 pages...

Polar Codes with Dynamic Frozen Symbols and Their Decoding by Directed Search

Trifonov, Peter; Miloslavskaya, Vera
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
45.94%
A novel construction of polar codes with dynamic frozen symbols is proposed. The proposed codes are subcodes of extended BCH codes, which ensure sufficiently high minimum distance. Furthermore, a decoding algorithm is proposed, which employs estimates of the not-yet-processed bit channel error probabilities to perform directed search in code tree, reducing thus the total number of iterations.; Comment: Accepted to ITW2013

TwoSpect: tuning up to search for gravitational waves from Scorpius X-1

Meadors, Grant David; Goetz, Evan; Riles, Keith
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 07/12/2015 Português
Relevância na Pesquisa
36.11%
We describe the tuning of the TwoSpect data analysis method to search for continuous gravitational waves from sources such as the Low Mass X-ray Binary, Scorpius X-1. TwoSpect sensitivity is enhanced when the source sky location and period are known. Simulations of the orbital and gravitational-wave parameters of Scorpius X-1 have already been made in the context of a comparison of search algorithms. These simulations are here used to quantify the sensitivity enhancement and parameter estimation abilities of this tuned, directed TwoSpect method. The gravitational wave strain, gravitational wave frequency, and projected semi-major axis of the binary system are recovered and uncertainty estimated, for simulated signals that are detected. Upper limits on gravitational wave strain are set for undetected signals. Applications to future searches in gravitational-wave interferometer data are discussed. Directed TwoSpect searches analyze gravitational-wave data for signals from LMXBs; robust against spin-wandering and computationally tractable for unknown signal frequency, this directed search method is an important tool to analyze interferometer detector data.; Comment: 17 pages, 5 figures

A directed search for continuous Gravitational Waves from the Galactic Center

The LIGO Scientific Collaboration; The Virgo Collaboration; Aasi, J.; Abadie, J.; Abbott, B. P.; Abbott, R.; Abbott, T.; Abernathy, M. R.; Accadia, T.; Acernese, F.; Adams, C.; Adams, T.; Adhikari, R. X.; Affeldt, C.; Agathos, M.; Aggarwal, N.; Aguiar, O.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
46.04%
We present the results of a directed search for continuous gravitational waves from unknown, isolated neutron stars in the Galactic Center region, performed on two years of data from LIGO's fifth science run from two LIGO detectors. The search uses a semi-coherent approach, analyzing coherently 630 segments, each spanning 11.5 hours, and then incoherently combining the results of the single segments. It covers gravitational wave frequencies in a range from 78 to 496 Hz and a frequency-dependent range of first order spindown values down to -7.86 x 10^-8 Hz/s at the highest frequency. No gravitational waves were detected. We place 90% confidence upper limits on the gravitational wave amplitude of sources at the Galactic Center. Placing 90% confidence upper limits on the gravitational wave amplitude of sources at the Galactic Center, we reach ~3.35x10^-25 for frequencies near 150 Hz. These upper limits are the most constraining to date for a large-parameter-space search for continuous gravitational wave signals.; Comment: 12 pages, 3 figures, 1 table; PDFLaTeX; to be published in Phys.Rev.D; a science summary can be found at http://www.ligo.org/science/Publication-GCSearch/index.php

Directed search for continuous gravitational waves from the Galactic center

Aasi, J.; Abadie, J.; Abbott, R.; Abernathy, M. R.; Adhikari, R. X.; Anderson, R. A.; Arai, K.; Araya, M. C.; Austin, L.; Barayoga, J. C.; Black, E.; Blackburn, J. K.; Bork, R.; Brooks, A. F.; Cepeda, C.; Chakraborty, R.; Chalermsongsak, T.; Coyne, D. C.;
Fonte: American Physical Society Publicador: American Physical Society
Tipo: Article; PeerReviewed Formato: application/pdf; application/pdf
Publicado em 18/11/2013 Português
Relevância na Pesquisa
46.04%
We present the results of a directed search for continuous gravitational waves from unknown, isolated neutron stars in the Galactic center region, performed on two years of data from LIGO’s fifth science run from two LIGO detectors. The search uses a semicoherent approach, analyzing coherently 630 segments, each spanning 11.5 hours, and then incoherently combining the results of the single segments. It covers gravitational wave frequencies in a range from 78 to 496 Hz and a frequency-dependent range of first-order spindown values down to −7.86×10^(−8)  Hz/s at the highest frequency. No gravitational waves were detected. The 90% confidence upper limits on the gravitational wave amplitude of sources at the Galactic center are ∼3.35×10^(−25) for frequencies near 150 Hz. These upper limits are the most constraining to date for a large-parameter-space search for continuous gravitational wave signals.

Directed search for continuous gravitational waves from the Galactic center

Chow, Jong; Chua, Sheon; Inta, Ra; McClelland, David; Miller, John; Mow-Lowry, C; Nguyen, Thanh; Scott, Susan M; Shaddock, Daniel; Slagmolen, Bram; Stochino, Alberto; Wade, Andrew; Ward, Robert; Woan, G; Torrie, Calum; Unnikrishnan, C S; Veitch, Peter Joh
Fonte: American Physical Society Publicador: American Physical Society
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
46%
We present the results of a directed search for continuous gravitational waves from unknown, isolated neutron stars in the Galactic center region, performed on two years of data from LIGO's fifth science run from two LIGO detectors. The search uses a semi

Correlational study between Escala de Aconselhamento Profissional (EAP) and Self-Directed Search (SDS); Estudo correlacional entre Escala de Aconselhamento Profissional (EAP) e Self-Directed Search (SDS)

Noronha, Ana Paula Porto; Ambiel, Rodolfo Augusto Matteo; Universidade São Francisco
Fonte: UFPR Publicador: UFPR
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; avaliado por pares; Formato: application/pdf
Publicado em 11/03/2009 Português
Relevância na Pesquisa
46.16%
A importância das pesquisas que visam desenvolver, validar e adaptar instrumentos de avaliação psicológica se dá no sentido de oferecer condições apropriadas de trabalho aos profissionais da Psicologia, especialmente no domínio da Orientação Profissional, no qual os instrumentos psicológicos visam levantar as características, interesses e habilidades do sujeito, a fim de se promover reflexão e tomada de decisão consciente e adequada. Nesse estudo, buscou-se a correlação entre os itens da Escala de Aconselhamento Profissional (EAP) com os itens da escala Atividades do Self-Directed Search (SDS) em uma amostra formada por estudantes de Psicologia, Educação Artística e Veterinária. Percebeu-se que a Tipologia de Holland pode ser uma ferramenta importante para predizer as atividades profissionais dos estudantes em suas especialidades, e que a EAP parece ser um bom instrumento para avaliar os interesses por meio das atividades profissionais, embora necessite ainda de mais estudos.  Palavras-chave: testes psicológicos; orientação profissional; avaliação psicológica.; The importance of research intended to develop...

Directed search with multiple job applications

Galenianos, Manolis; Kircher, Philipp
Fonte: Elsevier Publicador: Elsevier
Tipo: Article; PeerReviewed Formato: application/pdf
Publicado em /03/2009 Português
Relevância na Pesquisa
46.07%
We develop an equilibrium directed search model of the labor market where workers can simultaneously apply for multiple jobs. Our main theoretical contribution is to integrate the portfolio choice problem faced by workers into an equilibrium framework. All equilibria of our model exhibit wage dispersion. Consistent with stylized facts, the density of wages is decreasing and higher wage firms receive more applications per vacancy. Unlike most models of directed search, the equilibria are not constrained efficient.