1,720,973 research outputs found
THE SUPERSYMMETRIC VERSION OF THE GREEN-SCHWARZ ANOMALY CANCELLATION MECHANISM
No full textThe N = 1, D = 10 Supergravity-Super-Yang-Mills (SUGRA-SYM) theory is plagued by ABBJ gauge and Lorentz anomalies which are cancelled via the Green-Schwarz anomaly cancellation mechanism. Due to the fact that the ABBJ anomalies are not invariant under supersymmetry (SUSY) transformations one concludes that the theory is plagued also by a SUSY anomaly. For the gauge groups SO(32) and E8 × E8 we compute this SUSY anomaly, by solving a coupled cohomology problem, and we show that it can be cancelled by subtracting from the action the known Green-Schwarz counterterm, the same which cancels also the ABBJ anomaly, the expected result. Finally, we argue that the corresponding mechanism does not apply in the dual SUGRA-SYM, related to the heterotic five-brane. © 1994
DUALITY IN SUPERGRAVITY THEORIES
No full textThe target space dynamics of supermembrane (and superstring) theories is described by supergravity theories. Supergravity theories associated to dual supermembrane theories live in the same space-time dimension and are themselves dual to each other. We present a unified treatment in superspace of the two dual formulations of D = 10, N = 1 pure supergravity based on a strictly super-geometrical framework: the only fundamental objects are the super Riemann curvature and torsion, and the related Bianchi identities are sufficient to set the theory on shell; there is no need to introduce, from the beginning, closed three-or seven-superforms. This formulation extends also to non-minimal models. Moreover, in this framework the algebraic analogy between pure super Yang-Mills theoriesand pure supergravity in D = 10 is manifest. As an additional outcome in the present formulation the supersymmetric partner of the ABBJ-Lorentz anomaly in pure D = 10 supergravity can be computed in complete analog..
KAPPA-ANOMALIES AND SPACE-TIME SUPERSYMMETRY IN THE GREEN-SCHWARZ HETEROTIC SUPERSTRING
No full textThe computation of κ-anomalies in the Green-Schwarz heterotic superstring sigma-model and the corresponding Wess-Zumino consistency condition constitute a powerful alternative approach for the derivation of manifestly supersymmetric string effective actions. With respect to the beta-function approach this technique presents the advantage that a result which is obtained with the computation of beta-functions at n loops can be obtained through the calculation of κ-anomalies at n - 1 loops. In this paper we derive by a direct one-loop perturbative computation the κ-anomaly associated to the Yang-Mills Chern-Simons threeform, and, for the first time, the one associated to the Lorentz Chern-Simons threeform. In the calculation we shall use a convenient set of constraints for the pure N = 1, D = 10 supergravity theory which is algebraically identical to the standard set of constraints for the pure N = 1, D = 10 super Yang-Mills theory. Contrary to what is often stated in the literature we sh..
Quality and Impact Monitoring for Local eGovernment Services
Full text linkPurpose – The purpose of this paper is to introduce a layered, comprehensive model of quality of service (QoS) for local eGovernment, and discuss its feasibility on a regional eGovernment case study. The eGovernment online services are becoming a key infrastructure for advanced countries. They allow significant efficiency gains in different sectors of society, offering benefits for individual citizens and for the community as a whole. The deployment of online services alone is not sufficient in order to qualify an eGovernment strategy. The intrinsic and perceived quality of services offered, as well as the actual impact of new functionalities, should be properly measured and taken into account.
Design/methodology/approach – This paper presents an applied research study for a quality-focused evolution of a service-oriented architecture for local eGovernment portals. This investigation was based on three main layers: the perceived quality and effective impact of services (G2C layer), the effectiveness of the deployed processes (WFM layer) and finally, the system-level efficiency (G2G layer).
Findings – The measurement of quality with respect to eGovernment services is a complex task which requires appropriate tools to tackle the different aspects of the problem. Specifically, active and passive tools (respectively surveys and usage analysis) should be used to evaluate the quality perceived by the users as well as the utility of the service itself. The efficiency of the back office workflow must be estimated measuring statistical and dynamical indicators. Finally, technical measures should be used to monitor the responsiveness and scalability of software implementations and deployment systems.
Social implications – A better knowledge regarding (e-)Government service delivery processes, their QoS and their impact on the society can empower both citizens and local administrators, and can help them to better improve the effectiveness of local government.
Originality/value – The multi-layered quality measurement architecture proposed in this paper offers local governments the capability to systematically monitor and analyse the quality of their online services. The business process management technologies allow citizens to get a better knowledge of the service delivery processes; the QoS measurements allow to improve control on them; and the eGovernment Intelligence model allows to better quantify their actual social impact
KPIs from Web Agents for Policies’ Impact Analysis and Products’ Brand Assessment
No full textBoth Enterprises and Public Authorities (PAs) need a continuous and updated flux of reliable data in order to select the better choices. Classical Business Intelligence tools fed with internal data could be augmented with new tools able to extract KPIs of interest from the Raw Web made of unstructured HTML pages and from the Deep Web made of online DBs. The continuous growth of data made available on the web increases intrinsically, year by year, the reliability of this approach.
A “Web Intelligence” agents-based framework supporting the evaluation of the effective impact of projects and initiatives has been designed and is currently being developed and tested; the system combines up-to-date indicators obtained via a systematic and high frequency staggered data scraping with lower-rate extraction of data from online data sources. The corresponding model for the management, monitoring and assessment of projects implemented by Enterprises and PAs is also presented
Donne e Tecnologie Informatiche
Full text linkUn approfondimento quantitativo e qualitativo del gender gap esistente nelle ICT attraverso dati statistici, analisi del web, rapporti ufficiali, norme e politiche, con particolare attenzione alla realta' del Veneto
An Ontology-based Inquiry Framework.
Full text linkQuality of service (QoS) and citizens satisfaction are primary objectives for any eGovernment project. Quality can be inspected
directly through measurements of speci¯c QoS indicators; in the midst of innovation processes it is however more convenient to estimate quality indirectly, through questionnaire submissions to the involved citizens. The eGovernment Inquiry Framework (eGif) has been designed as a key tool to keep innovation projects controlled also being the first component of an eGovernment service oriented architecture with semantic capabilities.
Written in Java, based on well known open source libraries, exposed as a standard WSDL-defined web service, eGif helps survey campaign designers by keeping semantic information about the statistical variables used and interacting with servers for user identification. Questionnaire OWL-based ontologies are now investigated as a means to facilitate the creation of reusable survey knowledge base
Three-layered QoS for eGovernment web services
No full textAn applied research for the incremental evolution of a service oriented architecture for local eGovernment portals has been developed. Our reference eGovernment environment, currently adopted by a hundred local public administrations in Veneto region, is a dual model with a G2C interface towards citizens and a complementary G2G interface for municipal government staff, both interconnected and supporting a constellation of web services-based tools and applications. XPDL-compliant, workflow technology is now being applied in order to increase software re-use, process visibility and exchange and to ease process implementation/customization and execution. A case study for a layered model of QoS for eGovernment is presented. Three kinds of quality of services: (a) perceived level of services, (b) effectiveness of processes and (c) system-level efficiency, are measured in close correspondence with the different layers of eGovernment interactions: G2C, process orchestration/WFM and G2G
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