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CiteSeerX Scientific Literature Digital Library and Search Engine (2,578,359 recursos)
CiteSeerX is a scientific literature digital library and search engine that focuses primarily on the literature in computer and information science. CiteSeerx aims to improve the dissemination of scientific literature and to provide improvements in functionality, usability, availability, cost, comprehensiveness, efficiency, and timeliness in the access of scientific and scholarly knowledge

Mostrando recursos 1 - 20 de 2,513,703

1. Semantic Management of Distributed Web Applications - Daniel Oberle; Steffen Staab; Andreas Eberhart
An ontology-based approach facilitates the management and administration of distributed Web applications developed using application servers and Web services.

2. SWAP: Semantic Web and Peer-to-Peer Analysis of the State-of-the-Art in Ontology-based Knowledge Management - Peter Mika; Hans Akkermans
This paper attempts to provide a synthesis between ontology research and one of its most significant application areas, the business discipline of Knowledge Management. We feel that the natural synergies between the KM and ontology communities could be better exploited to the benefit of both fields. There is a particularly large potential for SWAP as it proposes decentralized ontology-based technology which would enable Distributed Knowledge Management (DKM) solutions not yet considered by the mainstream KM community. In order to help in bridging the gap between ontology research and applied Knowledge Management, this paper offers 1. An easily understood classification framework...

3. Semantic Management of Distributed Web Applications - Daniel Oberle; Steffen Staab; Andreas Eberhart
An ontology-based approach facilitates the management and administration of distributed Web applications developed using application servers and Web services.

4. An Extensible Approach for Modeling Ontologies In RDF(S) - Steffen Staab; Michael Erdmann; Alexander Maedche; Stefan Decker
RDF(S) constitutes a newly emerging standard for metadata that is about to turn the World Wide Web into a machine-understandable knowledge base. It is an XML application that allows for the denotation of facts and schemata in a web-compatible format, building on an elaborate object-model for describing concepts and relations. Thus, it might turn up as a natural choice for a widely-useable ontology description language. However, its lack of capabilities for describing the semantics of concepts and relations beyond those provided by inheritance mechanisms makes it a rather weak language for even the most austere knowledge-based system. This paper presents...

5. An Application Server for the Semantic Web - Daniel Oberle; Steffen Staab; Raphael Volz
The Semantic Web relies on the complex interaction of several technologies involving ontologies. Therefore, sophisticated Semantic Web applications typically comprise more than one software module. Instead of coming up with proprietary solutions, developers should be able to rely on a generic infrastructure for application development in this context. We call such an infrastructure Application Server for the Semantic Web whose design and development are based on existing Application Servers. However, we apply and augment their underlying concepts for use in the Semantic Web and integrate semantic technology within the server itself. We provide a short overview of requirements and design...

6. Discussion of "Random Rates in Anisotropic Regression" by Homann and Lepski - Lawrence D. Brown; Yi Lin

7. Stability of Methods for Matrix Inversion - Jeremy J. Du Croz; Nicholas J. Higham
Inversion of a triangular matrix can be accomplished in several ways. The standard methods are characterised by the loop ordering, whether matrix-vector multiplication, solution of a triangular system, or a rank-1 update is done inside the outer loop, and whether the method is blocked or unblocked. The numerical stability properties of these methods are investigated. It is shown that unblocked methods satisfy pleasing bounds on the left or right residual. However, for one of the block methods it is necessary to convert a matrix multiplication into the solution of a multiple right-hand side triangular system in order to have an...

8. Decay properties for functions of matrices over C∗-algebras - Michele Benzi; Paola Boito
We extend previous results on the exponential off-diagonal decay of the entries of analytic functions of banded and sparse matrices to the case where the matrix entries are elements of a C∗-algebra.

In this paper we consider the initial boundary value problem for strongly degenerate parabolic equations with discontinuous coefficients. This equation has the both properties of parabolic equation and hyperbolic equation. Moreover, approximate solutions for this equation may not belong to BV. These are difficult points for this type of equations. We consider the type of equations under the zero-flux boundary conditions. In particular, we prove the existence and partial uniqueness of weak solutions to such problems. Our proof use the compactness theorem derived by Panov [14] and the estimate of degenerate diffusion term derived by Karlsen-Risebro-Towers [10].

10. Cramer-von Mises regression - Kilani Ghoudi; David McDonald
Consider a linear regression model with unknown regression parameters # 0 and independent errors of unknown distribution. Block the observations into q groups whose independent variables have a common value and measure the homogeneity of the blocks of residuals by a Cramer-von Mises q-sample statistic Tq (#). This statistic is designed so that its expected value as a function of the chosen regression parameter # has a minimum value of zero precisely at the true value # 0 . The minimizer # of Tq (#)overall# is shown to be a consistent estimate of # 0 . It is also shown...

11. Comparatives In Context - Steffen Staab; Udo Hahn
We propose a model of semantic interpretation of comparatives which is based on a mechanism for semantic copying. Besides common phrasal and clausal forms of comparatives, our model also incorporates the analysis of referential and textual phenomena that interact with the interpretation of comparatives, viz. metonymies and omitted complements. In order to allow for efficient processing, guidance from syntactic, semantic, contextual and world knowledge sources is supplied.


It is shown that, under appropriate assumptions, the continuous algebraic Riccati equation with Toeplitz matrices as coefficients has Toeplitz-like solutions. Both infinite and sequences of finite Toeplitz matrices are considered, and also studied is the finite section method, which consists in approximating infinite systems by large finite truncations. The results are proved by translating the problem into C ∗-algebraic language and by using theorems on the Riccati equation in general C∗-algebras. The paper may serve as another illustration of the usefulness of C∗-algebra techniques in matrix theory.

14. Decay properties for functions of matrices over C∗-algebras - Michele Benzi; Paola Boito
We extend previous results on the exponential off-diagonal decay of the entries of analytic functions of banded and sparse matrices to the case where the matrix entries are elements of a C∗-algebra.

15. On Popa’s Cocycle Superrigidity Theorem - Alex Furman
These notes contain an Ergodic-theoretic account of the Cocycle Superrigidity Theorem recently discovered by Sorin Popa. We state and prove a relative version of the result, discuss some applications to measurable equivalence relations, and point out that Gaussian actions (of “rigid” groups) satisfy the assumptions of Popa’s theorem.

16. An Interest Groups Theory of Human Capital Accumulation: Theory and Evidence - José Pineda; Francisco Rodríguez
Investment in human capital accumulation, government consumption and total government expenditures present a striking negative correlation with capital shares. This correlation is robust to alternative specifications, lists of controls, and exclusion of outliers. Causality tests strongly support the hypothesis that the direction of causation runs from capital shares to the government spending variables. We present a political economy model of interest groups that can account for these correlations. In contrast, a median voter model predicts positive correlations between capital shares and the government spending variables.

17. Life cycle asset allocation in the presence of housing and tax-deferred investing - Marcel Marekwica; Alexander Schaefer; Steffen Sebastian

18. What Causes Industry Agglomeration? Evidence from Coagglomeration Patterns - Glenn Ellison; Edward L. Glaeser; William R. Kerr
Why do firms cluster near one another? We test Marshall’s theories of industrial agglomeration by examining which industries locate near one another, or coagglomerate. We construct pairwise coagglomeration indices for US manufacturing industries from the Economic Census. We then relate coagglomeration levels to the degree to which industry pairs share goods, labor, or ideas. To reduce reverse causality, where collocation drives input-output linkages or hiring patterns, we use data from UK industries and from US areas where the two industries are not collocated. All three of Marshall’s theories of agglomeration are supported, with input-output linkages particularly important.

19. Reply to “Comments on “On optimal control of spatially distributed systems”” - Nader Motee; Ali Jadbabaie

20. How Do Energy Prices, and Labor and Environmental Regulations Affect Local Manufacturing Employment Dynamics? A Regression Discontinuity Approach - Matthew E. Kahn; Erin T. Mansur
Manufacturing industries differ with respect to their energy intensity, labor-to-capital ratio and their pollution intensity. Across the United States, there is significant variation in electricity prices and labor and environmental regulation. This paper uses a regression discontinuity approach to examine whether the basic logic of comparative advantage can explain the geographical clustering of U.S. manufacturing. Using a unified empirical framework, we document that energy-intensive industries concentrate in low electricity price counties, labor-intensive industries avoid pro-union counties, and pollution-intensive industries locate in counties featuring relatively lax Clean Air Act regulation. We use our estimates to predict the likely jobs impacts of...

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