1,720,973 research outputs found
WSSMT: Towards the Automated Analysis of Security-Sensitive Services and Applications
No full textThe security of service-oriented applications is crucial in several contexts such as e-commerce or e-governance. The design, implementation, and deployment of this kind of services are often so complex that serious vulnerabilities remain even after extensive application of traditional validation techniques, such as testing. Given the importance of security-sensitive service applications, the development of techniques for their automated validation is growing. In this paper, we illustrate our formal framework to the specification and validation of security-sensitive applications structured in two levels: the workflow level (dealing with the control of flow and the manipulation of data) and the policy level (describing trust relationships and access control). In our framework, verification problems are reduced to logical problems whose decidability can be shown under suitable assumptions, which permit the validation of practically relevant classes of services. As a by-product, it is possible to re-use state-of-the-art theorem-proving technology to mechanize the verification process. This is the idea underlying our prototype validation tool WSSMT, "Web-Service (validation by) Satisfiability Modulo Theories'', which has been successfully used on two industrial case studies taken from the FP7 European project AVANTSSAR
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Automated Validation of Security-sensitive Web Services specified in BPEL and RBAC
No full textWe formalize automated analysis techniques for the validation of web services specified in BPEL and a RBAC variant tailored to BPEL. The idea is to use decidable fragments of first-order logic to describe the state space of a certain class of web services and then use state-of-the-art SMT solvers to handle their reach ability problems. To assess the practical viability of our approach, we have developed a prototype tool implementing our techniques and applied it to a digital contract signing service inspired by an industrial case study
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Solving Robust Glucose-Insulin Control by Dixon Resultant Computations
Get PDFWe present a symbolic approach towards solving the Bergman three-state minimal patient model of glucose metabolism. Our work first translates the Bergman three-state minimal patient model into the modified control algebraic Riccati equation. Next, the modified control algebraic Ricatti equation is reduced to a system of polynomial equations, and an optimal (minimal) solution of these polynomials is computed using Dixon resultants. We demonstrate the use of our method by reporting on three case studies over glucose metabolism
An Editor Calculus With Undo/Redo
Get PDFStructure editors provide many potential usability benefits to an end-user by allowing them to edit the AST representation of a program rather than a textual representation of it. In addition, they all but remove syntax errors by only allowing the constructing of programs that are syntactically valid. However, structure editors only rarely include undo/redo functionality into the editor itself, and to the best of our knowledge, an underlying, formal specification for undo/redo has yet to be developed. This paper continues previous work on an editor calculus; we extend the calculus with undo and redo and present a history-based operational semantics of the extension. The history used an underlying graph-based structure, containing a history of user actions in the particular structure editor. We study the expressive power of the calculus, give a simple proof of its Turing-power and use the expressiveness result to show how our history-based extension with undo and redo can be expressed in the original editor calculus.Structure editors provide many potential usability benefits to an end-user by allowing them to edit the AST representation of a program rather than a textual representation of it. In addition, they all but remove syntax errors by only allowing the constructing of programs that are syntactically valid. However, structure editors only rarely include undo/redo functionality into the editor itself, and to the best of our knowledge, an underlying, formal specification for undo/redo has yet to be developed. This paper continues previous work on an editor calculus; we extend the calculus with undo and redo and present a history-based operational semantics of the extension. The history used an underlying graph-based structure, containing a history of user actions in the particular structure editor. We study the expressive power of the calculus, give a simple proof of its Turing-power and use the expressiveness result to show how our history-based extension with undo and redo can be expressed in the original editor calculus
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