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Main Theories (main + theory)

Distribution by Scientific Domains
Humanities and Social Sciences37%
Business, Economics, Finance and Accounting25%

Selected Abstracts

Reinvigorating the Study of Foreign Policy Decision Making: Toward a Constructivist Approach

FOREIGN POLICY ANALYSIS, Issue 1 2007
DAVID PATRICK HOUGHTON
For many years, the study of foreign policy analysis (FPA) has been a kind of free-floating enterprise, logically unconnected to the main theories of international relations (IR). Sometimes, it has been subsumed under the liberal or pluralist sections of textbooks, and at other times placed within a discussion of realism. But the logical connections to both of these paradigms were always strained. The appeal of FPA approaches has also waxed and waned over the years, in part because these approaches do not appear to "fit" anywhere within the framework of the larger debates going on in IR. This article suggests that a dialogue with social constructivism provides the most logical base from which to launch a revitalized approach to FPA, especially the cognitive psychological approach to the study of foreign policy. If the FPA agenda is to be reinvigorated and taken more seriously outside the subfield itself, this article suggests, it must hitch its wagon to some of the critical substantive debates going on in IR theory today. Indeed, there are already some signs that the cognitive approach to FPA in particular is increasingly being associated with this larger body of theory. [source]

A systematic review and quantitative appraisal of fMRI studies of verbal fluency: Role of the left inferior frontal gyrus

HUMAN BRAIN MAPPING, Issue 10 2006
Sergi G. Costafreda
Abstract The left inferior frontal gyrus (LIFG) has consistently been associated with both phonologic and semantic operations in functional neuroimaging studies. Two main theories have proposed a different functional organization in the LIFG for these processes. One theory suggests an anatomic parcellation of phonologic and semantic operations within the LIFG. An alternative theory proposes that both processes are encompassed within a supramodal executive function in a single region in the LIFG. To test these theories, we carried out a systematic review of functional magnetic resonance imaging studies employing phonologic and semantic verbal fluency tasks. Seventeen articles meeting our pre-established criteria were found, consisting of 22 relevant experiments with 197 healthy subjects and a total of 41 peak activations in the LIFG. We determined 95% confidence intervals of the mean location (x, y, and z coordinates) of peaks of blood oxygenation level-dependent (BOLD) responses from published phonologic and semantic verbal fluency studies using the nonparametric technique of bootstrap analysis. Significant differences were revealed in dorsal,ventral (z -coordinate) localizations of the peak BOLD response: phonologic verbal fluency peak BOLD response was significantly more dorsal to the peak associated with semantic verbal fluency (confidence interval of difference: 1.9,17.4 mm). No significant differences were evident in antero,posterior (x -coordinate) or medial,lateral (y -coordinate) positions. The results support distinct dorsal,ventral locations for phonologic and semantic processes within the LIFG. Current limitations to meta-analytic integration of published functional neuroimaging studies are discussed. Hum Brain Mapp, 2006. © 2006 Wiley-Liss, Inc. [source]

A least square extrapolation method for the a posteriori error estimate of the incompressible Navier Stokes problem

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS, Issue 1 2005
M. Garbey
Abstract A posteriori error estimators are fundamental tools for providing confidence in the numerical computation of PDEs. To date, the main theories of a posteriori estimators have been developed largely in the finite element framework, for either linear elliptic operators or non-linear PDEs in the absence of disparate length scales. On the other hand, there is a strong interest in using grid refinement combined with Richardson extrapolation to produce CFD solutions with improved accuracy and, therefore, a posteriori error estimates. But in practice, the effective order of a numerical method often depends on space location and is not uniform, rendering the Richardson extrapolation method unreliable. We have recently introduced (Garbey, 13th International Conference on Domain Decomposition, Barcelona, 2002; 379,386; Garbey and Shyy, J. Comput. Phys. 2003; 186:1,23) a new method which estimates the order of convergence of a computation as the solution of a least square minimization problem on the residual. This method, called least square extrapolation, introduces a framework facilitating multi-level extrapolation, improves accuracy and provides a posteriori error estimate. This method can accommodate different grid arrangements. The goal of this paper is to investigate the power and limits of this method via incompressible Navier Stokes flow computations. Copyright © 2005 John Wiley & Sons, Ltd. [source]

Multinationality and performance: A synthetic review and research agenda

INTERNATIONAL JOURNAL OF MANAGEMENT REVIEWS, Issue 2 2007
Lei Li
This paper provides a reflective and synthetic review of the literature on the relationship between a firm's multinationality and performance. It revisits the main theories and demonstrates a gradual shift from the traditionally equilibrium-oriented theorization to the recent dynamics-oriented perspectives. It also examines the current status of empirical inquiry and identifies some important voids. The following areas are highlighted for further conceptual development and empirical investigation: (1) conceptual refinement and measurement of multinationality as a construct; (2) cost-efficiency implications of multinationality; (3) impact of internationalization motivations on both multinationality and performance; (4) two-way relationships between multinationality and performance; and (5) moderating roles of important external and internal contextual factors. [source]

Welfare, Work Requirements, and Dependant-Care

JOURNAL OF APPLIED PHILOSOPHY, Issue 3 2004
Elizabeth Anderson
abstract This article considers the justice of requiring employment as a condition of receiving public assistance. While none of the main theories of justice prohibits work requirements, the arguments in their favour are weak. Arguments based on reciprocity fail to explain why only means-tested public benefits should be subject to work requirements, and why unpaid dependant care work should not count as satisfying citizens' obligations to reciprocate. Arguments based on promoting the work ethic misattribute recipients' nonwork to deviant values, when their core problem is finding steady employment consistent with supporting a family and meeting dependant care responsibilities. Rigid work requirements impose unreasonable costs on some of the poor. A welfare system based on a rebuttable presumption that recipients will work for pay, conjoined with more generous work supports, would promote justice better than either unconditional welfare or strict requirements [1]. [source]

From Foraging To Farming: Explaining The Neolithic Revolution

JOURNAL OF ECONOMIC SURVEYS, Issue 4 2005
Jacob L. Weisdorf
Abstract., This article reviews the main theories about the prehistoric shift from hunting and gathering to agriculture. The transition, also known as the Neolithic Revolution, was ultimately necessary to the rise of modern civilization by creating the foundation for the later process of industrialization and sustained economic growth. The article provides a brief historical survey of the leading hypotheses concerning the rise of agriculture proposed in the archaeological and anthropological literature. It then turns to a more detailed review of the theories put forth in the economic literature. [source]

Cellular origins of ,-cell regeneration: a legacy view of historical controversies

JOURNAL OF INTERNAL MEDICINE, Issue 4 2009
A. Granger
Abstract. Beta-cell regeneration represents a major goal of therapy for diabetes. Unravelling the origin of , cells during pancreatic regeneration could help restore a functional ,-cell mass in diabetes patients. This scientific question has represented a longstanding interest still intensively investigated today. This review focuses on pioneering observations and subsequent theories made 100 years ago and describes how technical innovation helped resolve some, but not all, of the controversies generated by these early investigators. At the end of the 19th century, complete pancreatectomy demonstrated the crucial physiological role of the pancreas and its link with diabetes. Pancreatic injury models, including pancreatectomy and ductal ligation, allowed investigators to describe islet function and to assess the regenerative capacity of the pancreas. Three main theories were proposed to explain the origins of newly formed islets: (i) transdifferentiation of acinar cells into islets, (ii) islet neogenesis, a process reminiscent of islet formation during embryonic development, and (iii) replication of preexisting islet cells. Despite considerable technical innovation in the last 50 years, the origin of new adult , cells remains highly controversial and the same three theories are still debated today. [source]

A RIGHT TO REPRODUCE?

BIOETHICS, Issue 8 2010
MUIREANN QUIGLEY
ABSTRACT How should we conceive of a right to reproduce? And, morally speaking, what might be said to justify such a right? These are just two questions of interest that are raised by the technologies of assisted reproduction. This paper analyses the possible legitimate grounds for a right to reproduce within the two main theories of rights; interest theory and choice theory. [source]