WorldWideScience

Sample records for web services composition

  1. Intelligent Overload Control for Composite Web Services

    NARCIS (Netherlands)

    Meulenhoff, P.J.; Ostendorf, D.R.; Zivkovic, M.; Meeuwissen, H.B.; Gijsen, B.M.M.

    2009-01-01

    In this paper, we analyze overload control for composite web services in service oriented architectures by an orchestrating broker, and propose two practical access control rules which effectively mitigate the effects of severe overloads at some web services in the composite service. These two rules

  2. Intelligent overload control for composite web services

    NARCIS (Netherlands)

    Meulenhoff, P.J.; Ostendorf, D.R.; Živković, M.; Meeuwissen, H.B.; Gijsen, B.M.M.

    2009-01-01

    In this paper, we analyze overload control for composite web services in service oriented architectures by an orchestrating broker, and propose two practical access control rules which effectively mitigate the effects of severe overloads at some web services in the composite service. These two rules

  3. A Framework for Dynamic Web Services Composition

    NARCIS (Netherlands)

    Lécué, Freddy; Silva, Eduardo; Ferreira Pires, Luis

    2008-01-01

    Dynamic composition of web services is a promising approach and at the same time a challenging research area for the dissemination of service-oriented applications. It is widely recognised that service semantics is a key element for the dynamic composition of Web services, since it allows the unambi

  4. A Framework for Dynamic Web Services Composition

    NARCIS (Netherlands)

    Lécué, F.; Goncalves da Silva, E.M.; Ferreira Pires, L.

    2007-01-01

    Dynamic composition of web services is a promising approach and at the same time a challenging research area for the dissemination of service-oriented applications. It is widely recognised that service semantics is a key element for the dynamic composition of Web services, since it allows the unambi

  5. A Survey on Formal Methods for Web Service Composition

    OpenAIRE

    Wang, Yong

    2013-01-01

    Web Service Composition creates new composite Web Services from existing Web Services which embodies the added values of Web Service technology and is a key technology to solve cross-organizational business process integrations. We do a survey on formal methods for Web Service Composition in the following way. Through analyses of Web Service Composition, we establish a reference model called RM-WSComposition to capture elements of Web Service Composition. Based on the RM-WSComposition, issues...

  6. Immune Algorithm for Selecting Optimum Services in Web Services Composition

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    For the problem of dynamic optimization in Web services composition, this paper presents a novel approach for selecting optimum Web services, which is based on the longest path method of weighted multistage graph. We propose and implement an Immune Algorithm for global optimization to construct composed Web services. Results of the experimentation illustrates that the algorithm in this paper has a powerful capability and can greatly improve the efficiency and veracity in service selection.

  7. An Automatic Web Service Composition Framework Using QoS-Based Web Service Ranking Algorithm.

    Science.gov (United States)

    Mallayya, Deivamani; Ramachandran, Baskaran; Viswanathan, Suganya

    2015-01-01

    Web service has become the technology of choice for service oriented computing to meet the interoperability demands in web applications. In the Internet era, the exponential addition of web services nominates the "quality of service" as essential parameter in discriminating the web services. In this paper, a user preference based web service ranking (UPWSR) algorithm is proposed to rank web services based on user preferences and QoS aspect of the web service. When the user's request cannot be fulfilled by a single atomic service, several existing services should be composed and delivered as a composition. The proposed framework allows the user to specify the local and global constraints for composite web services which improves flexibility. UPWSR algorithm identifies best fit services for each task in the user request and, by choosing the number of candidate services for each task, reduces the time to generate the composition plans. To tackle the problem of web service composition, QoS aware automatic web service composition (QAWSC) algorithm proposed in this paper is based on the QoS aspects of the web services and user preferences. The proposed framework allows user to provide feedback about the composite service which improves the reputation of the services.

  8. RECOMMENDATION FOR WEB SERVICE COMPOSITION BY MINING USAGE LOGS

    Directory of Open Access Journals (Sweden)

    Vivek R

    2016-03-01

    Full Text Available Web service composition has been one of the most researched topics of the past decade. Novel methods of web service composition are being proposed in the literature include Semantics-based composition, WSDLbased composition. Although these methods provide promising results for composition, search and discovery of web service based on QoS parameter of network and semantics or ontology associated with WSDL, they do not address composition based on usage of web service. Web Service usage logs capture time series data of web service invocation by business objects, which innately captures patterns or workflows associated with business operations. Web service composition based on such patterns and workflows can greatly streamline the business operations. In this research work, we try to explore and implement methods of mining web service usage logs. Main objectives include Identifying usage association of services. Linking one service invocation with other, Evaluation of the causal relationship between associations of services.

  9. A Service Design Oriented Web Services Composite Platform

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    In order to realize flexible, adaptable, extensible, efficient, and user-friendly service composition, we propose a service design oriented Web Service composite platform (SDOWSCP) and a service composition mechanism called composed-service-requestor-oriented service composition (OBSDOSC). SDOWSCP imports ontology into UDDI to define and annotate services in a flexible and intuitive manner and employs a concept of bond as a solution to the process heterogeneity. OBSDOSC is proposed in order to do some efforts to overcome some defects which current design tools usually have such as not user-friendly and too professional. This paper proposes a pattern which describes the basic features of semi-automatic composite mode, discusses the whole lifetime of composed service and highlights how to lessen the descriptive heterogeneity and process heterogeneity and how to facilitate the design of composing a service.

  10. SEMANTIC WEB SERVICES – DISCOVERY, SELECTION AND COMPOSITION TECHNIQUES

    Directory of Open Access Journals (Sweden)

    Sowmya Kamath S

    2013-02-01

    Full Text Available Web services are already one of the most important resources on the Internet. As an integrated solution for realizing the vision of the Next Generation Web, semantic web services combine semantic web technology with web service technology, envisioning automated life cycle management of web services. This paper discusses the significance and importance of service discovery & selection to business logic, and the requisite current research in the various phases of the semantic web service lifecycle like discovery and selection. We also present several different composition strategies, based on current research, and provide an outlook towards critical future work.

  11. Dynamic web service composition based on OWL-S

    Institute of Scientific and Technical Information of China (English)

    Jing DONG; Yongtao SUN; Sheng YANG; Kang ZHANG

    2006-01-01

    Composing existing web services for enterprise applications may enable higher level of reuse. However the composition processes are mostly static and lack of support for runtime redesign. In this paper, we describe our approach to the extension of the OWL-S ontology framework for dynamic web service composition. We raise the level of abstraction and propose an abstract service layer so that web services can be composed at the abstract service level instead of the concrete level. Each abstract service is attached with an instance pool including all instances of the abstract service to facilitate fail-over and dynamic compositions.

  12. A New Approach to Development of Composite Web Services

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    With the requirement for complex Web Services steadily increasing, there is a growing interest for reusing basic, existing Web Services to composite new ones. We present a composite Web Services development approach driven by model driven architecture (MDA): using UML(Unified Modeling Language) class diagram to model structure PIM(Plateform Independent Platform) and UML activity diagram to model behavior PIM, then by model transformation converting the PIMs to specific Web Services specification platforms and execution platform to get the corresponding PSMs (platform specific models). The main contributions of this paper are the all-around solution to Web Services composition development and the transformation rules for structure and behavior model of Web Services between PIMs and PSMs.

  13. Web service composition: a semantic web and automated planning technique application

    Directory of Open Access Journals (Sweden)

    Jaime Alberto Guzmán Luna

    2010-05-01

    Full Text Available This article proposes applying semantic web and artificial intelligence planning techniques to a web services composition model dealing with problems of ambiguity in web service description and handling incomplete web information. The model uses an OWL-S services and implements a planning technique which handles open world semantics in its reasoning process to resolve these problems. This resulted in a web services composition system incorporating a module for interpreting OWL-S services and converting them into a planning problem in PDDL (a planning module handling incomplete information and an execution service module concurrently interacting with the planner for executing each composition plan service.

  14. Software Reliability in Semantic Web Service Composition Applications

    Directory of Open Access Journals (Sweden)

    Liviu Adrian COTFAS

    2010-01-01

    Full Text Available Web Service Composition allows the development of easily reconfigurable applications that can be quickly adapted to business changes. Due to the shift in paradigm from traditional systems, new approaches are needed in order to evaluate the reliability of web service composition applications. In this paper we present an approach based on intelligent agents for semiautomatic composition as well as methods for assessing reliability. Abstract web services, corresponding to a group of services that accomplishes a specific functionality are used as a mean of assuring better system reliability. The model can be extended with other Quality of Services – QoS attributes.

  15. A web service for service composition to aid geospatial modelers

    Science.gov (United States)

    Bigagli, L.; Santoro, M.; Roncella, R.; Mazzetti, P.

    2012-04-01

    The identification of appropriate mechanisms for process reuse, chaining and composition is considered a key enabler for the effective uptake of a global Earth Observation infrastructure, currently pursued by the international geospatial research community. In the Earth and Space Sciences, such a facility could primarily enable integrated and interoperable modeling, for what several approaches have been proposed and developed, over the last years. In fact, GEOSS is specifically tasked with the development of the so-called "Model Web". At increasing levels of abstraction and generalization, the initial stove-pipe software tools have evolved to community-wide modeling frameworks, to Component-Based Architecture solution, and, more recently, started to embrace Service-Oriented Architectures technologies, such as the OGC WPS specification and the WS-* stack of W3C standards for service composition. However, so far, the level of abstraction seems too low for implementing the Model Web vision, and far too complex technological aspects must still be addressed by both providers and users, resulting in limited usability and, eventually, difficult uptake. As by the recent ICT trend of resource virtualization, it has been suggested that users in need of a particular processing capability, required by a given modeling workflow, may benefit from outsourcing the composition activities into an external first-class service, according to the Composition as a Service (CaaS) approach. A CaaS system provides the necessary interoperability service framework for adaptation, reuse and complementation of existing processing resources (including models and geospatial services in general) in the form of executable workflows. This work introduces the architecture of a CaaS system, as a distributed information system for creating, validating, editing, storing, publishing, and executing geospatial workflows. This way, the users can be freed from the need of a composition infrastructure and

  16. Optimizing QoS-Aware Semantic Web Service Composition

    Science.gov (United States)

    Lécué, Freddy

    Ranking and optimization of web service compositions are some of the most interesting challenges at present. Since web services can be enhanced with formal semantic descriptions, forming the "semantic web services", it becomes conceivable to exploit the quality of semantic links between services (of any composition) as one of the optimization criteria. For this we propose to use the semantic similarities between output and input parameters of web services. Coupling this with other criteria such as quality of service (QoS) allow us to rank and optimize compositions achieving the same goal. Here we suggest an innovative and extensible optimization model designed to balance semantic fit (or functional quality) with non-functional QoS metrics. To allow the use of this model in the context of a large number of services as foreseen by the strategic EC-funded project SOA4All we propose and test the use of Genetic Algorithms.

  17. Graph based E-Government web service composition

    CERN Document Server

    Elmaghraoui, Hajar; Chiadmi, Dalila; Benhlima, Laila

    2011-01-01

    Nowadays, e-government has emerged as a government policy to improve the quality and efficiency of public administrations. By exploiting the potential of new information and communication technologies, government agencies are providing a wide spectrum of online services. These services are composed of several web services that comply with well defined processes. One of the big challenges is the need to optimize the composition of the elementary web services. In this paper, we present a solution for optimizing the computation effort in web service composition. Our method is based on Graph Theory. We model the semantic relationship between the involved web services through a directed graph. Then, we compute all shortest paths using for the first time, an extended version of the Floyd-Warshall algorithm.

  18. Runtime Monitoring Composite Web Services Through Stateful Aspect Extension

    Institute of Scientific and Technical Information of China (English)

    Tao Huang; Guo-Quan Wu; Jun Wei

    2009-01-01

    The execution of composite Web services with WS-BPEL relies on externally autonomous Web services. This implies the need to constantly monitor the running behavior of the involved parties. Moreover, monitoring the execution of composite Web services for particular patterns is critical to enhance the reliability of the processes. In this paper,we propose an aspect-oriented framework as a solution to provide monitoring and recovery support for composite Web services. In particular, this framework includes 1) a stateful aspect based template, where history-based pointcut specifies patterns of interest cannot be violated within a range, while advice specifies the associated recovery action; 2) a tool support for runtime monitoring and recovery based on aspect-oriented execution environment. Our experiments indicate that the proposed monitoring approach incurs minimal overhead and is efficient.

  19. Reinforcement Learning Based Web Service Compositions for Mobile Business

    Science.gov (United States)

    Zhou, Juan; Chen, Shouming

    In this paper, we propose a new solution to Reactive Web Service Composition, via molding with Reinforcement Learning, and introducing modified (alterable) QoS variables into the model as elements in the Markov Decision Process tuple. Moreover, we give an example of Reactive-WSC-based mobile banking, to demonstrate the intrinsic capability of the solution in question of obtaining the optimized service composition, characterized by (alterable) target QoS variable sets with optimized values. Consequently, we come to the conclusion that the solution has decent potentials in boosting customer experiences and qualities of services in Web Services, and those in applications in the whole electronic commerce and business sector.

  20. A Quality of Service Broker Based Process Model for Dynamic Web Service Composition

    Directory of Open Access Journals (Sweden)

    Maya Rathore

    2011-01-01

    Full Text Available Problem statement: With fast spreading of web services technology over the Internet, the quality aspects of a web service has received significant attention to the practitioners. The quality of web service includes both functional and nonfunctional details. In order to provide the correct and meaningful information to web service consumer, sometimes there is a need to compose existing web services in order to create new web service. Approach: We have proposed a Quality of Service (QoS broker based process model for Dynamic Web Service Composition (DWSC. The QoS broker in the proposed model is responsible for web service collection, selection, optimization and composition based on the service consumer’s requirements. It also verifies and certifies the functional and QoS specifications provided by service provider at the time of web service registration before publishing it in Universal Description, Discovery and Integration (UDDI registry. The detailed working of QoS broker is also presented in the study with functionality of each component. We will also discuss the process flowchart for new web service registration and web service composition at runtime. Results: The proposed QoS broker based model for dynamic web service composition solves the problems associated with quality of web service. It also prevents the central repository from malicious service provider to publish wrong information. Conclusion: The QoS broker-based process model for dynamic web service composition guarantees the quality of delivered service to web service consumers and improve the efficiency of composition.

  1. RESEARCH ON REUSE-BASED WEB SERVICES COMPOSITION

    Institute of Scientific and Technical Information of China (English)

    Rao Yuan; Li Zunchao; Feng Boqin

    2005-01-01

    Objective To solve the three principal problems for reusing the software components, i.e., existence, discovery and availability principles, web services provided a new solution for reusing and assembling web software or components under distributed environment with a series of XML-based protocols. Methods A 4+1 meta-model between atomic services, such as Sequence, Parallelism, Alternation, Substitute and Iteration, and a kind of service composition description language in composition process are investigated. Furthermore, an architecture-based service composition model with Ontology Engine is proposed, which is based on the software architecture life-cycle model and provides a mechanism for services composition with dynamic management and deployment. Results The results of the prototype system development show that the service-composed application not only reused the web service components, but also reused the data resources located in distributed databases. Conclusion The method of reused-based web services composition observably decreases the period and cost of development and greatly improves the programming efficiency.

  2. Dynamic profit optimization of composite web services with SLAs

    NARCIS (Netherlands)

    Živković, M.; Bosman, J.W.; van den Berg, J.L.; van der Mei, R.D.; Meeuwissen, H.B.; Núñez-Queija, R.

    2011-01-01

    In this paper we investigate sequential decision mechanisms for composite web services. After executing each sub-service within a sequential workflow, decisions are made whether to terminate or continue the execution of the workflow. These decisions are based on observed response times, expected rew

  3. Dynamic profit optimization of composite web services with SLAs

    NARCIS (Netherlands)

    Živković, M.; Bosman, J.W.; van den Berg, J.L.; van der Mei, R.D.; Meeuwissen, H.B.; Núñez-Queija, R.

    2011-01-01

    In this paper we investigate sequential decision mechanisms for composite web services. After executing each sub-service within a sequential workflow, decisions are made whether to terminate or continue the execution of the workflow. These decisions are based on observed response times, expected

  4. Dynamic Profit Optimization of Composite Web Services with SLAs

    NARCIS (Netherlands)

    Zivkovic, M.; Bosman, J.W.; Berg, J.L. van den; Mei, R.D. van der; Meeuwissen, H.B.; Nunez-Queija, R.

    2011-01-01

    In this paper we investigate sequential decision mechanisms for composite web services. After executing each sub-service within a sequential workflow, decisions are made whether to terminate or continue the execution of the workflow. These decisions are based on observed response times, expected rew

  5. Dynamic profit optimization of composite web services with SLAs

    NARCIS (Netherlands)

    Živković, M.; Bosman, J.W.; van den Berg, J.L.; van der Mei, R.D.; Meeuwissen, H.B.; Núñez-Queija, R.

    2011-01-01

    In this paper we investigate sequential decision mechanisms for composite web services. After executing each sub-service within a sequential workflow, decisions are made whether to terminate or continue the execution of the workflow. These decisions are based on observed response times, expected rew

  6. Dynamic Profit Optimization of Composite Web Services with SLAs

    NARCIS (Netherlands)

    Zivkovic, Miroslav; Bosman, J.W.; van den Berg, Hans Leo; van der Mei, R.D.; Meeuwissen, H.B.; Nunez Queija, R.

    2011-01-01

    In this paper we investigate sequential decision mechanisms for composite web services. After executing each sub-service within a sequential workflow, decisions are made whether to terminate or continue the execution of the workflow. These decisions are based on observed response times, expected rew

  7. Towards Automation Design Time Testing of Web Service Compositions

    Directory of Open Access Journals (Sweden)

    Dessislava Petrova-Antonova

    2012-01-01

    Full Text Available Service-Oriented Architectures (SOA allows software applications to interoperate in a new way in distributed environment. Currently, web services are the most widely adopted technology for implementation of SOA. However, they bring a number of challenges to development as well as to testing. Testing web service compositions is one of the major problems in SOA domain that is due to the unknown context, absence of web service source code, multiple provider coordination,lack of tool support, etc. In such context, the paper proposes a framework, named Testing as a Service Software Architecture (TASSA, which aims to provide design time testing of both functional and nonfunctional behavior of web service compositions described with Business Process Execution Language (BPEL. TASSA consists of set of tools that can be used together with existing development environments of service based applications. The paper focuses on an approach for negative testing and unit testing of BPEL processes. The negative testing is supported by TASSA tool, called Fault Injector tool, which implements a fault injection technique providing messagedelays, wrong message data, etc. The goal of unit testing is to test a BPEL process in isolation from its dependent web services. The isolation technique is implemented in another TASSA tool, named Isolation tool.

  8. Composition de Services Web: Une Approche basée Liens Sémantiques

    OpenAIRE

    Lécué, Freddy

    2008-01-01

    Automated composition of Web services or the process of forming new value added Web services is one of the most promising challenges facing the Semantic Web today. Semantics enables Web service to describe capabilities together with their processes, hence one of the key elements for the automated composition of Web services. In this Ph.D study we focus on the functional level of Web services i.e., services are described according i) to some input, output parameters semantically enhanced by co...

  9. Formal Modeling of Trust Web Service Composition Using Pi-calculus

    Directory of Open Access Journals (Sweden)

    Bensheng YUN

    2013-08-01

    Full Text Available To enhance the credibility of Web service composition, Pi-calculus based formal modeling of trust Web service composition is proposed. Trust Web service composition is firstly defined abstractly; then Pi-calculus is used to depict structure and internal interaction of Trust Web service composition, the mapping relation between trust entity and Pi-calculus is provided. Automatic reasoner MWB is adopted to analyze and reason the Trust Web service composition system, which is aimed at finding and correcting the faults before the implementation of trust authentication of Web service composition. It thus meets the users’ demands on trust quality effectively.

  10. Optimization and Ranking in Web Service Composition using Performance Index

    Directory of Open Access Journals (Sweden)

    Srinath V

    2012-09-01

    Full Text Available Selection of the best service from the existing composite services is an emerging technology that aims at attaining a better performance. The steps involved include selection of relevant web services from the composite service, followed by optimization and ranking that ultimately leads to the execution of the best service. This paper concentrates on combining optimization and ranking based on non-functional QoS parameters to evaluate its quality. The concept of optimization is carried out by ACO (Ant Colony Optimization algorithm. The optimization principle uses the concept of pheromone deposition and evaporation on the services. Ranking is done using performance index which is calculated dynamically from the non-functional QoS parameters. This ensures that the application based on this approach is efficient and fault tolerant. The result is obtained by measuring the performance of the services for multiple requests.

  11. A Compositive Information Collection Platform System Based on Web Service

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The aim is to solve the problem that how to share dispersive and heterogeneous data inside business information system or some other information source. On the basis of Web service, this paper adopts the notion of Data As Service to build service-oriented data integration architecture. According to this architecture, we develop data collection system which effectively integrates data from heterogeneous information source and present a uniform data view to end users by implementing sharing data from heterogeneous systems and information source .At last, this paper gives an example of a compositive information collection platform system.

  12. Magallanes: a web services discovery and automatic workflow composition tool

    Directory of Open Access Journals (Sweden)

    Trelles Oswaldo

    2009-10-01

    Full Text Available Abstract Background To aid in bioinformatics data processing and analysis, an increasing number of web-based applications are being deployed. Although this is a positive circumstance in general, the proliferation of tools makes it difficult to find the right tool, or more importantly, the right set of tools that can work together to solve real complex problems. Results Magallanes (Magellan is a versatile, platform-independent Java library of algorithms aimed at discovering bioinformatics web services and associated data types. A second important feature of Magallanes is its ability to connect available and compatible web services into workflows that can process data sequentially to reach a desired output given a particular input. Magallanes' capabilities can be exploited both as an API or directly accessed through a graphic user interface. The Magallanes' API is freely available for academic use, and together with Magallanes application has been tested in MS-Windows™ XP and Unix-like operating systems. Detailed implementation information, including user manuals and tutorials, is available at http://www.bitlab-es.com/magallanes. Conclusion Different implementations of the same client (web page, desktop applications, web services, etc. have been deployed and are currently in use in real installations such as the National Institute of Bioinformatics (Spain and the ACGT-EU project. This shows the potential utility and versatility of the software library, including the integration of novel tools in the domain and with strong evidences in the line of facilitate the automatic discovering and composition of workflows.

  13. Dynamic Composition of Web Services based on Event Driven Approach in SOA

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    P.S. Ashok Kumar

    2014-08-01

    Full Text Available Dynamic Composition of Web services is a Key research in the arena of E-commerce. Enterprise applications are developed as a service provider in the web, some of the challenges we are faced by web services are most likely related to composition of services, security and Quality of Services (QoS. Within these challenges, composition of web service turns out to be a big arena of research, because it supports the integration and Interoperability of B2B applications or enterprise application or E-commerce application. Pragmatically dynamic composition of semantic web services specifies better results compared to the traditional method of discovering candidate services for composition. In this study we present the degree of matching and selection of web services are considered as a salient feature to the dynamic composition of web services.

  14. Run-time revenue maximization for composite web services with response time commitments

    NARCIS (Netherlands)

    Živković, M.; Bosman, J.W.; Berg, H. van den; Mei, R. van der; Meeuwissen, H.B.; Núñez-Queija, R.

    2012-01-01

    We investigate dynamic decision mechanisms for composite web services maximizing the expected revenue for the providers of composite services. A composite web service is represented by a (sequential) workflow, and for each task within this workflow, a number of service alternatives may be available.

  15. Runtime revenue maximization for composite Web services with response-time commitments

    NARCIS (Netherlands)

    M. Zivkovic; J.W. Bosman (Joost); J.L. van den Berg (Hans); H.B. Meeuwissen; R.D. van der Mei (Rob); R. Núñez Queija (Rudesindo (Sindo))

    2012-01-01

    htmlabstractWe investigate dynamic decision mechanisms for composite web services maximizing the expected revenue for the providers of composite services. A composite web service is represented by a (sequential) workflow, and for each of the tasks within this workflow, a number of service

  16. Run-time Revenue Maximization for Composite Web Services with Response Time Commitments

    NARCIS (Netherlands)

    Zivkovic, Miroslav; Bosman, J.W.; van den Berg, Hans Leo; van der Mei, R.D.; Meeuwissen, H.B.; Nunez Queija, R.

    We investigate dynamic decision mechanisms for composite web services maximizing the expected revenue for the providers of composite services. A composite web service is represented by a (sequential) workflow, and for each task within this workflow, a number of service alternatives may be available.

  17. Run-time revenue maximization for composite web services with response time commitments

    NARCIS (Netherlands)

    Živković, M.; Bosman, J.W.; Berg, H. van den; Mei, R. van der; Meeuwissen, H.B.; Núñez-Queija, R.

    2012-01-01

    We investigate dynamic decision mechanisms for composite web services maximizing the expected revenue for the providers of composite services. A composite web service is represented by a (sequential) workflow, and for each task within this workflow, a number of service alternatives may be available.

  18. Hybrid QoS-aware semantic web service composition strategies

    Institute of Scientific and Technical Information of China (English)

    YANG FangChun; SU Sen; LI Zhen

    2008-01-01

    Hybrid QoS model which consists of certain and uncertain expressions has strong power of semantic QoS description. For solving the hybrid QoS-aware semantic web service composition problem, this paper presents an Uncertain Multi-attribute decision making based Composition algorithm (UMC). The UMC includes two parts. First, UMC-Core can be used to synthetically evaluate the hybrid service quality information. Second, UMC-DH (Distributed and Heuristic framework for UMC) aims at enhancing the run-time performance of UMC when the problem space increases. The simulation results show that the UMC has lower execution cost, higher ap proximation ratio and success ratio than other similar approaches.

  19. Multi-Agent Based Model for Web Service Composition

    OpenAIRE

    2016-01-01

    The evolution of the Internet and the competitiveness among companies were factors in the explosion of Web services. Web services are applications available on the Internet each performing a particular task. Web users often need to call different services to achieve a more complex task that can’t be satisfied by a simple service. And users often prefer to have the best services responding to their requests. In this context, we should measure the Quality of Service (QoS) which is a very import...

  20. Composition of web services in BPMN%用BPMN辅助整合Web Services

    Institute of Scientific and Technical Information of China (English)

    胡燕梅; 邱锦伦

    2007-01-01

    介绍了用BPMN设计整合Web Service,并产生Web Service描述语言(WSDL)形式的可执行规范语言,以及利用WSDL可以转换成业务流程管理标识(BPMN)的方法,动态地将已存在的Web Service通过BPMN图形化建模方法进行整合.鉴于BPMN的图形化设计,可以选择喜欢的可执行语言来实现该整合方案,主要采用与BPMN密切关联的Web Service语言--面向服务的业务流程可执行语言(BPEL4WS).

  1. A Trusted Composition Evaluation Model to Support Web Services Coordination in Multi Domains

    Directory of Open Access Journals (Sweden)

    Li Qilong

    2012-03-01

    Full Text Available With the widespread development of web services application in multi-domains, more and more researchers have focused on the quality of web services composition. However, the research on the evaluation method for web services composition is still little nowadays. Therefore, a QoS-driven Trusted Composition Evaluation Model (TCEM is proposed in this study, it can judge the business stream effectively and comprehensively by choosing an appropriate and trusted evaluation method for the generated services composition chains. Furthermore, on the basis of Case-Based Reasoning (CBR and the retrieval mechanism oriented to web services coordination, the TCEM-based execution engine and algorithm is implemented to evaluate the quality of service composition. The proposed algorithm has the satisfied result compared with the traditional method, and it shows more efficient and trustworthy where web services composition is widely used in multi domains.

  2. Reliable execution based on CPN and skyline optimization for Web service composition.

    Science.gov (United States)

    Chen, Liping; Ha, Weitao; Zhang, Guojun

    2013-01-01

    With development of SOA, the complex problem can be solved by combining available individual services and ordering them to best suit user's requirements. Web services composition is widely used in business environment. With the features of inherent autonomy and heterogeneity for component web services, it is difficult to predict the behavior of the overall composite service. Therefore, transactional properties and nonfunctional quality of service (QoS) properties are crucial for selecting the web services to take part in the composition. Transactional properties ensure reliability of composite Web service, and QoS properties can identify the best candidate web services from a set of functionally equivalent services. In this paper we define a Colored Petri Net (CPN) model which involves transactional properties of web services in the composition process. To ensure reliable and correct execution, unfolding processes of the CPN are followed. The execution of transactional composition Web service (TCWS) is formalized by CPN properties. To identify the best services of QoS properties from candidate service sets formed in the TCSW-CPN, we use skyline computation to retrieve dominant Web service. It can overcome that the reduction of individual scores to an overall similarity leads to significant information loss. We evaluate our approach experimentally using both real and synthetically generated datasets.

  3. Reliable Execution Based on CPN and Skyline Optimization for Web Service Composition

    Directory of Open Access Journals (Sweden)

    Liping Chen

    2013-01-01

    Full Text Available With development of SOA, the complex problem can be solved by combining available individual services and ordering them to best suit user’s requirements. Web services composition is widely used in business environment. With the features of inherent autonomy and heterogeneity for component web services, it is difficult to predict the behavior of the overall composite service. Therefore, transactional properties and nonfunctional quality of service (QoS properties are crucial for selecting the web services to take part in the composition. Transactional properties ensure reliability of composite Web service, and QoS properties can identify the best candidate web services from a set of functionally equivalent services. In this paper we define a Colored Petri Net (CPN model which involves transactional properties of web services in the composition process. To ensure reliable and correct execution, unfolding processes of the CPN are followed. The execution of transactional composition Web service (TCWS is formalized by CPN properties. To identify the best services of QoS properties from candidate service sets formed in the TCSW-CPN, we use skyline computation to retrieve dominant Web service. It can overcome that the reduction of individual scores to an overall similarity leads to significant information loss. We evaluate our approach experimentally using both real and synthetically generated datasets.

  4. Research on user-aware QoS based Web services composition

    Institute of Scientific and Technical Information of China (English)

    LIU Feng; LEI Zhen-ming

    2009-01-01

    To improve user experience of composite Web services, a user-aware quality of service (QoS) based Web services composition model is proposed. Under such model, a Web services selection method based on quantum genetic algorithm is proposed. This algorithm uses quantum bit encoding, dynamic step-length quantum gate angle adjustment, neighborhood service search and dynamic punishment strategy to expand search scope and speed up convergence. Simulation experiment shows that this algorithm is more efficient than other existing algorithms in Web services selection.

  5. A METHOD FOR SEMANTIC WEB SERVICE COMPOSITION BASED ON PATTERN MATCHING

    OpenAIRE

    Mogos, Andrei-Horia; Adina Magda FLOREA

    2010-01-01

    The composition of semantic web services is a very important and actual problem in the semantic web services research area. There are several semi-automatic approaches for this problem, but most of the results are related to automatic approaches. In this paper we present an automatic approach for the composition of semantic web services based on pattern matching. We consider a special type of semantic description, represented as a list of semantic descriptions corresponding to several semanti...

  6. A Cost-Effective Planning Graph Approach for Large-Scale Web Service Composition

    Directory of Open Access Journals (Sweden)

    Szu-Yin Lin

    2012-01-01

    Full Text Available Web Service Composition (WSC problems can be considered as a service matching problem, which means that the output parameters of a Web service can be used as inputs of another one. However, when a very large number of Web services are deployed in the environment, the service composition has become sophisticated and complicated process. In this study, we proposed a novel cost-effective Web service composition mechanism. It utilizes planning graph based on backward search algorithm to find multiple feasible solutions and recommends a best composition solution according to the lowest service cost. In other words, the proposed approach is a goal-driven mechanism, which can recommend the approximate solutions, but it consumes fewer amounts of Web services and less nested levels of composite service. Finally, we implement a simulation platform to validate the proposed cost-effective planning graph mechanism in large-scale Web services environment. The simulation results show that our proposed algorithm based on the backward planning graph has reduced by 94% service cost in three different environments of service composition that is compared with other existing service composition approaches which are based on a forward planning graph.

  7. The EEE-05 Challenge: A New Web Service Discovery and Composition Competition

    NARCIS (Netherlands)

    Blake, M. Brian; Tsui, Kwok Ching; Wombacher, Andreas

    2005-01-01

    With growing acceptance of service-oriented computing, an emerging area of research is the investigation of technologies that will enable the discovery and composition of web services. Using the same approach as the popular Trading Agent Competitions (TAC), the EEE-05 Web Services Challenge is the f

  8. Concept Mapping for Faster QoS-AwareWeb Service Composition

    NARCIS (Netherlands)

    Degeler, Viktoriya; Georgievski, Ilče; Lazovik, Alexander; Aiello, Marco

    2010-01-01

    The availability of Web services with similar functionality but different QoS values creates new challenges for Web services composition: not only functional properties of the composed service must be satisfied, but also non-functional properties such as response time and throughput must be optimal.

  9. QoS-Driven Self-Healing Web Service Composition Based on Performance Prediction

    Institute of Scientific and Technical Information of China (English)

    Yu Dai; Lei Yang; Bin Zhang

    2009-01-01

    Web services run in a highly dynamic environment, as a result, the QoS of which will change relatively frequently.In order to make the composite service adapt to such dynamic property of Web services, we propose a self-healing approach for web service composition. Such an approach is an integration of backing up in selection and reselecting in execution. In order to make the composite service heal itself as quickly as possible and minimize the number of reselections, a way of performance prediction is proposed in this paper. On this basis, the self-healing approach is presented including framework,the triggering algorithm of the reselection and the reliability model of the service. Experiments show that the proposed solutions have better performance in supporting the self-healing Web service composition.

  10. Automated web service composition supporting conditional branch structures

    Science.gov (United States)

    Wang, Pengwei; Ding, Zhijun; Jiang, Changjun; Zhou, Mengchu

    2014-01-01

    The creation of value-added services by automatic composition of existing ones is gaining a significant momentum as the potential silver bullet in service-oriented architecture. However, service composition faces two aspects of difficulties. First, users' needs present such characteristics as diversity, uncertainty and personalisation; second, the existing services run in a real-world environment that is highly complex and dynamically changing. These difficulties may cause the emergence of nondeterministic choices in the process of service composition, which has gone beyond what the existing automated service composition techniques can handle. According to most of the existing methods, the process model of composite service includes sequence constructs only. This article presents a method to introduce conditional branch structures into the process model of composite service when needed, in order to satisfy users' diverse and personalised needs and adapt to the dynamic changes of real-world environment. UML activity diagrams are used to represent dependencies in composite service. Two types of user preferences are considered in this article, which have been ignored by the previous work and a simple programming language style expression is adopted to describe them. Two different algorithms are presented to deal with different situations. A real-life case is provided to illustrate the proposed concepts and methods.

  11. Fruit Fly Optimization Algorithm for Network-Aware Web Service Composition in the Cloud

    Directory of Open Access Journals (Sweden)

    Umar SHEHU

    2016-02-01

    Full Text Available Service Oriented Computing (SOC provides a framework for the realization of loosely coupled service oriented applications. Web services are central to the concept of SOC. Currently, research into how web services can be composed to yield QoS optimal composite service has gathered significant attention. However, the number and spread of web services across the cloud data centers has increased, thereby increasing the impact of the network on composite service performance experienced by the user. Recently, QoS-based web service composition techniques focus on optimizing web service QoS attributes such as cost, response time, execution time, etc. In doing so, existing approaches do not separate QoS of the network from web service QoS during service composition. In this paper, we propose a network-aware service composition approach which separates QoS of the network from QoS of web services in the Cloud. Consequently, our approach searches for composite services that are not only QoS-optimal but also have optimal QoS of the network. Our approach consists of a network model which estimates the QoS of the network in the form of network latency between services on the cloud. It also consists of a service composition technique based on fruit fly optimization algorithm which leverages the network model to search for low latency compositions without compromising service QoS levels. The approach is discussed and the results of evaluation are presented. The results indicate that the proposed approach is competitive in finding QoS optimal and low latency solutions when compared to recent techniques.

  12. Graph-Based Semantic Web Service Composition for Healthcare Data Integration

    Science.gov (United States)

    2017-01-01

    Within the numerous and heterogeneous web services offered through different sources, automatic web services composition is the most convenient method for building complex business processes that permit invocation of multiple existing atomic services. The current solutions in functional web services composition lack autonomous queries of semantic matches within the parameters of web services, which are necessary in the composition of large-scale related services. In this paper, we propose a graph-based Semantic Web Services composition system consisting of two subsystems: management time and run time. The management-time subsystem is responsible for dependency graph preparation in which a dependency graph of related services is generated automatically according to the proposed semantic matchmaking rules. The run-time subsystem is responsible for discovering the potential web services and nonredundant web services composition of a user's query using a graph-based searching algorithm. The proposed approach was applied to healthcare data integration in different health organizations and was evaluated according to two aspects: execution time measurement and correctness measurement.

  13. Graph-Based Semantic Web Service Composition for Healthcare Data Integration

    Directory of Open Access Journals (Sweden)

    Ngamnij Arch-int

    2017-01-01

    Full Text Available Within the numerous and heterogeneous web services offered through different sources, automatic web services composition is the most convenient method for building complex business processes that permit invocation of multiple existing atomic services. The current solutions in functional web services composition lack autonomous queries of semantic matches within the parameters of web services, which are necessary in the composition of large-scale related services. In this paper, we propose a graph-based Semantic Web Services composition system consisting of two subsystems: management time and run time. The management-time subsystem is responsible for dependency graph preparation in which a dependency graph of related services is generated automatically according to the proposed semantic matchmaking rules. The run-time subsystem is responsible for discovering the potential web services and nonredundant web services composition of a user’s query using a graph-based searching algorithm. The proposed approach was applied to healthcare data integration in different health organizations and was evaluated according to two aspects: execution time measurement and correctness measurement.

  14. Ontology Based Dynamic e-Learning Flow Composition of Learning Web Services

    Directory of Open Access Journals (Sweden)

    M. Farida Begam

    2014-06-01

    Full Text Available Web Services has instigated it’s transcend and now education has been made simple through Web Services. With the advent of Web Services, education has become far more personal, flexible and available across global borders. Workflow is a sequence of business tasks to be realized for the execution of user’ request. Identifying required e-learning web services and dynamic composition and realization of those services is a challenging process. In this study we have suggested e-learning services workflow composing architecture and relevant algorithms for matching and composing e-learning flow for the learners with different learning styles. We suggested non logic based hybrid matching and composing algorithms which uses OWL-S profile and process ontologies for dynamic workflow composition of e-learning web services.

  15. Study on uncertainty of geospatial semantic Web services composition based on broker approach and Bayesian networks

    Science.gov (United States)

    Yang, Xiaodong; Cui, Weihong; Liu, Zhen; Ouyang, Fucheng

    2008-10-01

    The Semantic Web has a major weakness which is lacking of a principled means to represent and reason about uncertainty. This is also located in the services composition approaches such as BPEL4WS and Semantic Description Model. We analyze the uncertainty of Geospatial Web Service composition through mining the knowledge in historical records of composition based on Broker approach and Bayesian Networks. We proved this approach is effective and efficient through a sample scenario in this paper.

  16. Web services foundations

    CERN Document Server

    Bouguettaya, Athman; Daniel, Florian

    2013-01-01

    Web services and Service-Oriented Computing (SOC) have become thriving areas of academic research, joint university/industry research projects, and novel IT products on the market. SOC is the computing paradigm that uses Web services as building blocks for the engineering of composite, distributed applications out of the reusable application logic encapsulated by Web services. Web services could be considered the best-known and most standardized technology in use today for distributed computing over the Internet.Web Services Foundations is the first installment of a two-book collection coverin

  17. A Formal Model for BPEL4WS Description of Web Service Composition

    Institute of Scientific and Technical Information of China (English)

    GU Xiwu; LU Zhengding

    2006-01-01

    Communicating Sequential Processes (CSP) is a kind of process algebra, which is suitable for modeling and verifying Web service composition.This paper describes how to model Web service composition with CSP.A set of rules for translating composition constructor of Business Process Execution Language for Web Services (BPEL4WS) to CSP notations is defined.According to the rules that have been defined, the corresponding translation algorithm is designed and illustrated with examples.The methods for model checking,model verification and model simulation are also introduced.

  18. A Novel Trust-Aware Composite Semantic Web Service Selection Approach

    Directory of Open Access Journals (Sweden)

    Denghui Wang

    2015-01-01

    Full Text Available The functional characteristics and the nonfunctional properties of service profile always play very important roles in composite semantic web service selection approach. But the credibility of this information cannot be guaranteed. This paper established a novel trust degree model of this information. Based on this model, the trust degrees can be calculated from execution log and user experience evaluation of candidate web services. Then the paper proposes a new composite semantic web service selection approach based on this credible information. Finally, we present two experiments to prove that the new approach can avoid the influence of exaggerated and unauthentic information effectively and accurately.

  19. Optimal QoS-Aware Web Service Composition

    NARCIS (Netherlands)

    Aiello, Marco; Khoury, Elie el; Lazovik, Alexander; Ratelband, Patrick

    2009-01-01

    The availability of many independent services on an open network opens the opportunity of composing individual instances to achieve complex functionality. Most often there are several possible compositions to achieve the same high-level functionality; the advantage of choosing one composition instea

  20. Web Services modeling and composition approach using Objects-Oriented Petri Nets

    Directory of Open Access Journals (Sweden)

    Sofiane Chemaa

    2012-07-01

    Full Text Available Nowadays, with the emergence and the evolution of new technologies, such as e-business, a large number of companies are connected to Internet, and have proposed web services to trade. Web services as presented, are conceptually limited components to relatively simple functionalities. Generally, a single service does not satisfy the users needs that are more and more complex. Therefore, services must be made able to be composed to offer added value services. In this paper, a web services composition approach, modelled by Objects-Oriented Petri nets, is presented. In his context, an expressive algebra, which successfully solves the web services complex composition problem, is proposed. A java tool that allows automating this approach; based on a definite algebra and a G-nets meta-model, proposed by us, is developed.

  1. A verification strategy for web services composition using enhanced stacked automata model.

    Science.gov (United States)

    Nagamouttou, Danapaquiame; Egambaram, Ilavarasan; Krishnan, Muthumanickam; Narasingam, Poonkuzhali

    2015-01-01

    Currently, Service-Oriented Architecture (SOA) is becoming the most popular software architecture of contemporary enterprise applications, and one crucial technique of its implementation is web services. Individual service offered by some service providers may symbolize limited business functionality; however, by composing individual services from different service providers, a composite service describing the intact business process of an enterprise can be made. Many new standards have been defined to decipher web service composition problem namely Business Process Execution Language (BPEL). BPEL provides an initial work for forming an Extended Markup Language (XML) specification language for defining and implementing business practice workflows for web services. The problems with most realistic approaches to service composition are the verification of composed web services. It has to depend on formal verification method to ensure the correctness of composed services. A few research works has been carried out in the literature survey for verification of web services for deterministic system. Moreover the existing models did not address the verification properties like dead transition, deadlock, reachability and safetyness. In this paper, a new model to verify the composed web services using Enhanced Stacked Automata Model (ESAM) has been proposed. The correctness properties of the non-deterministic system have been evaluated based on the properties like dead transition, deadlock, safetyness, liveness and reachability. Initially web services are composed using Business Process Execution Language for Web Service (BPEL4WS) and it is converted into ESAM (combination of Muller Automata (MA) and Push Down Automata (PDA)) and it is transformed into Promela language, an input language for Simple ProMeLa Interpreter (SPIN) tool. The model is verified using SPIN tool and the results revealed better recital in terms of finding dead transition and deadlock in contrast to the

  2. QOS BASED SELECTION AND COMPOSITION OF WEB SERVICES-A FUZZY APPROACH

    Directory of Open Access Journals (Sweden)

    N. Hema Priya

    2014-01-01

    Full Text Available Web Services are emerging technologies which satisfy users’ requests on the Web. Selecting appropriate services to suit the needs is a huge task. There are a huge number of service providers who offer same type of service, with differences in functional and non functional qualities. A few users may need multiple services at the same moment. So composition of services also becomes important. Moreover the consumers get confused in selecting apt services, which leads to the necessity of an automated service selection mechanism based on QoS metrics. It is tedious to find the service with the composite of QoS parameters along with the consumer vague perception. We take these constraints into account and implement a fuzzy rule based algorithm for selection and composition. The open source environment is preferred for a number of reasons. The simulation results show that this setup works well in Service oriented environments.

  3. AUTOMATIC WEB SERVICE SELECTION BY OPTIMIZING COST OF COMPOSITION IN SLAKY COMPOSER USING ASSIGNMENT MINIMIZATION APPROACH

    Directory of Open Access Journals (Sweden)

    P. Sandhya

    2012-12-01

    Full Text Available Web service composition is a means of building enterprises virtually by knitting relevant web services on the fly. Automatic web service composition is done dynamically at runtime. Extensive research has been done in the field of automatic web service composition. However all the works focus on providing client oriented results and hence there is less industry adoption of composition technology. In this paper we have proposed a new service collaboration stack that composes with realistic business metrics of a provider in addition to client metrics. Some of the service provider metrics include time planning, profit management, native intelligence, user adoption, environment, market scenario, vision and industry adoption. In this paper we focus on enhancing industry adoption through optimizing cost of service composition. We propose the SLAKY composer that solves assignment of appropriate service during composition as an assignment minimization problem to reduce the cost of composition. We also extend OWL-S profile sub ontology to augment cost as a service parameter.

  4. A theorem proving framework for the formal verification of Web Services Composition

    Directory of Open Access Journals (Sweden)

    Petros Papapanagiotou

    2011-08-01

    Full Text Available We present a rigorous framework for the composition of Web Services within a higher order logic theorem prover. Our approach is based on the proofs-as-processes paradigm that enables inference rules of Classical Linear Logic (CLL to be translated into pi-calculus processes. In this setting, composition is achieved by representing available web services as CLL sentences, proving the requested composite service as a conjecture, and then extracting the constructed pi-calculus term from the proof. Our framework, implemented in HOL Light, not only uses an expressive logic that allows us to incorporate multiple Web Services properties in the composition process, but also provides guarantees of soundness and correctness for the composition.

  5. A theorem proving framework for the formal verification of Web Services Composition

    CERN Document Server

    Papapanagiotou, Petros; 10.4204/EPTCS.61.1

    2011-01-01

    We present a rigorous framework for the composition of Web Services within a higher order logic theorem prover. Our approach is based on the proofs-as-processes paradigm that enables inference rules of Classical Linear Logic (CLL) to be translated into pi-calculus processes. In this setting, composition is achieved by representing available web services as CLL sentences, proving the requested composite service as a conjecture, and then extracting the constructed pi-calculus term from the proof. Our framework, implemented in HOL Light, not only uses an expressive logic that allows us to incorporate multiple Web Services properties in the composition process, but also provides guarantees of soundness and correctness for the composition.

  6. QoS Measurement of Workflow-Based Web Service Compositions Using Colored Petri Net

    Science.gov (United States)

    Nematzadeh, Hossein; Motameni, Homayun; Nematzadeh, Zahra

    2014-01-01

    Workflow-based web service compositions (WB-WSCs) is one of the main composition categories in service oriented architecture (SOA). Eflow, polymorphic process model (PPM), and business process execution language (BPEL) are the main techniques of the category of WB-WSCs. Due to maturity of web services, measuring the quality of composite web services being developed by different techniques becomes one of the most important challenges in today's web environments. Business should try to provide good quality regarding the customers' requirements to a composed web service. Thus, quality of service (QoS) which refers to nonfunctional parameters is important to be measured since the quality degree of a certain web service composition could be achieved. This paper tried to find a deterministic analytical method for dependability and performance measurement using Colored Petri net (CPN) with explicit routing constructs and application of theory of probability. A computer tool called WSET was also developed for modeling and supporting QoS measurement through simulation. PMID:25110748

  7. QoS Measurement of Workflow-Based Web Service Compositions Using Colored Petri Net

    Directory of Open Access Journals (Sweden)

    Hossein Nematzadeh

    2014-01-01

    Full Text Available Workflow-based web service compositions (WB-WSCs is one of the main composition categories in service oriented architecture (SOA. Eflow, polymorphic process model (PPM, and business process execution language (BPEL are the main techniques of the category of WB-WSCs. Due to maturity of web services, measuring the quality of composite web services being developed by different techniques becomes one of the most important challenges in today’s web environments. Business should try to provide good quality regarding the customers’ requirements to a composed web service. Thus, quality of service (QoS which refers to nonfunctional parameters is important to be measured since the quality degree of a certain web service composition could be achieved. This paper tried to find a deterministic analytical method for dependability and performance measurement using Colored Petri net (CPN with explicit routing constructs and application of theory of probability. A computer tool called WSET was also developed for modeling and supporting QoS measurement through simulation.

  8. QoS measurement of workflow-based web service compositions using Colored Petri net.

    Science.gov (United States)

    Nematzadeh, Hossein; Motameni, Homayun; Mohamad, Radziah; Nematzadeh, Zahra

    2014-01-01

    Workflow-based web service compositions (WB-WSCs) is one of the main composition categories in service oriented architecture (SOA). Eflow, polymorphic process model (PPM), and business process execution language (BPEL) are the main techniques of the category of WB-WSCs. Due to maturity of web services, measuring the quality of composite web services being developed by different techniques becomes one of the most important challenges in today's web environments. Business should try to provide good quality regarding the customers' requirements to a composed web service. Thus, quality of service (QoS) which refers to nonfunctional parameters is important to be measured since the quality degree of a certain web service composition could be achieved. This paper tried to find a deterministic analytical method for dependability and performance measurement using Colored Petri net (CPN) with explicit routing constructs and application of theory of probability. A computer tool called WSET was also developed for modeling and supporting QoS measurement through simulation.

  9. Advanced web services

    CERN Document Server

    Bouguettaya, Athman; Daniel, Florian

    2013-01-01

    Web services and Service-Oriented Computing (SOC) have become thriving areas of academic research, joint university/industry research projects, and novel IT products on the market. SOC is the computing paradigm that uses Web services as building blocks for the engineering of composite, distributed applications out of the reusable application logic encapsulated by Web services. Web services could be considered the best-known and most standardized technology in use today for distributed computing over the Internet. This book is the second installment of a two-book collection covering the state-o

  10. Genetic Algorithm-Based Multi-objective Optimisation for QoS-Aware Web Services Composition

    Science.gov (United States)

    Li, Li; Yang, Pengyi; Ou, Ling; Zhang, Zili; Cheng, Peng

    Finding an optimal solution for QoS-aware Web service composition with various restrictions on qualities is a multi-objective optimisation problem. A popular multi-objective genetic algorithm, NSGA-II, is studied in order to provide a set of optimal solutions for QoS-based service composition. Experiments with different numbers of abstract and concrete services confirm the expected behaviour of the algorithm.

  11. The Activity Chain Safety and Liveness Specification of Composite Web Services

    Science.gov (United States)

    Chen, Bo; Huang, Xiaomei

    Web service composition is most impressing method for development and deployment of e-business. Description and modeling the behavior requirements of composite Web services for users and verifying composite Web service compliance to specific requirements is an important key in design of services. But most work does not address the issue of how to model the requirements that the BPEL4WS processes are supposed to satisfy. The specifications in verification works are general temporal relation based on activity or scenario in essence. Distinguish with these work, we propose a novel concept of behavior specification based on activity chain in which granularity is between activity and scenario. Chain existence mode, chain absence mode are designed to express such behavioral requirements based on activity chain that is similar with safety or liveness specification based on activity respectively. Encode them on Labeled Transition System LTS and then give them exact operation semantics. Finally, an example is illustrated.

  12. Verification of communication protocols in web services model-checking service compositions

    CERN Document Server

    Tari, Zahir; Mukherjee, Anshuman

    2014-01-01

    Gathers recent advancements in the field of self-organizing wireless sensor networks and provides readers with the essential, state-of-the-art information about sensor networking. In the near future, wireless sensor networks will become an integral part of our day-to-day life. To solve different sensor networking related issues, researchers have put a great deal of effort into coming up with innovative ideas. Verification of Communication Protocols in Web Services: Model-Checking Service Compositions gathers recent advancements in the field of self-organizing wireless sensor networks and provides readers with integral information about sensor networking. It introduces current technological trends, particularly in node organization, and provides implementation details of each networking type to help readers set up sensor networks in their related job fields. In addition, it identifies the limitations of current technologies, as well as future research directions.

  13. Study on dynamic services composition of web services based on BPEL

    Science.gov (United States)

    Gao, Jinyue; Huang, Fei; Zhang, Gongxuan

    2013-12-01

    From the core concepts of SOA (Service-Oriented Architecture) ——"Service" starting the service composition is discussed in detail, from the service relationships network modeling, services dynamic composition approach based on Business Process Execution Language BPEL (Business Process Execution Language) is proposed in this paper, meanwhile two concepts of service agent and service quality are described, which achieve the service process dynamic execution.

  14. AutoSyn:A new approach to automated synthesis of composite web services with correctness guarantee

    Institute of Scientific and Technical Information of China (English)

    HUAI JinPeng; DENG Ting; LI XianXian; DU ZongXia; GUO HuiPeng

    2009-01-01

    How to compose existing web services automatically and to guarantee the correctness of the design (e.g.freeness of deadlock and unspecified reception,and temporal constraints) is an important and challenging problem in web services.Most existing approaches require a detailed specification of the desired behaviors of a composite service beforehand and then perform certain formal verification to guarantee the correctness of the design,which makes the composition process both complex and time-consuming.In this paper,we propose a novel approach,referred to as AutoSyn to compose web services,where the correctness is guaranteed in the synthesis process.For a given set of services,a composite service is automatically constructed based on L* algorithm,which guarantees that the composite service is the most general way of coordinating services so that the correctness is ensured.We show the soundness and completeness of our solution and give a set of optimization techniques for reducing the time consumption.We have implemented a prototype system of AutoSyn and evaluated the effectiveness and efficiency of AutoSyn through an experimental study.

  15. 基于服务质量的 Web 服务组合模型%The QoS-Based Web Service Composition Model

    Institute of Scientific and Technical Information of China (English)

    周文勇; 郭颂; 张继军

    2013-01-01

      分析了 Web 服务主要的非功能属性因素,探讨了这些因素对 Web 服务的服务质量所产生的影响。提出了 Web 服务的 QoS 评价方法,并将 Web 服务的 QoS 作为 Web 服务选择的条件之一。构建基于 QoS 的 Web服务组合模型,利用查找后继 Web 服务的选择方法,实现 Web 服务的有效组合,使得组合 Web 服务既能满足用户的功能需求,又达到用户个性化服务的目的。%The main nonfunctional attributes of Web services were analyzed , and the QoS about the Web service affected by these attributes was discussed .The evaluation method of QoS for Web service was proposed , and QoS was regarded as one of the conditions selecting Web service for Web service composition .Web service composition model based on QoS was formed, and the effective composition of the Web service was realized by using the methods of selec -ting subsequent Web service.This composition Web service can meet not only the functional requirements but also the personalized service for users.

  16. A Multi-Agent System for the Composition of Semantic Web Services Based on Complexity Functions and Learning Algorithms

    Directory of Open Access Journals (Sweden)

    Andrei-Horia MOGOS

    2014-01-01

    Full Text Available Semantic web services represent an important and actual research area in computer science. A very popular topic in this area is the composition of semantic web services, which can be used for obtaining new semantic web services from existing ones. Based on a representation method for the semantic descriptions of semantic web services, that we had previously proposed, we propose a multi-agent system for the composition of semantic web services based on complexity functions and learning algorithms. Our system starts as a semi-automatic composition system, but after it gathers (using learning algorithms sufficient information about the knowledge domain in which it is used, the system is able to perform compositions of semantic web services automatically. Based on the previously proposed representation method, this paper describes the structure and the main algorithms of the proposed system. The paper also presents an example of using the proposed system and some experimental results.

  17. AWSCS-A System to Evaluate Different Approaches for the Automatic Composition and Execution of Web Services Flows.

    Science.gov (United States)

    Tardiole Kuehne, Bruno; Estrella, Julio Cezar; Nunes, Luiz Henrique; Martins de Oliveira, Edvard; Hideo Nakamura, Luis; Gomes Ferreira, Carlos Henrique; Carlucci Santana, Regina Helena; Reiff-Marganiec, Stephan; Santana, Marcos José

    2015-01-01

    This paper proposes a system named AWSCS (Automatic Web Service Composition System) to evaluate different approaches for automatic composition of Web services, based on QoS parameters that are measured at execution time. The AWSCS is a system to implement different approaches for automatic composition of Web services and also to execute the resulting flows from these approaches. Aiming at demonstrating the results of this paper, a scenario was developed, where empirical flows were built to demonstrate the operation of AWSCS, since algorithms for automatic composition are not readily available to test. The results allow us to study the behaviour of running composite Web services, when flows with the same functionality but different problem-solving strategies were compared. Furthermore, we observed that the influence of the load applied on the running system as the type of load submitted to the system is an important factor to define which approach for the Web service composition can achieve the best performance in production.

  18. Semi-automatic web service composition for the life sciences using the BioMoby semantic web framework.

    Science.gov (United States)

    DiBernardo, Michael; Pottinger, Rachel; Wilkinson, Mark

    2008-10-01

    Researchers in the life-sciences are currently limited to small-scale informatics experiments and analyses because of the lack of interoperability among life-sciences web services. This limitation can be addressed by annotating services and their interfaces with semantic information, so that interoperability problems can be reasoned about programmatically. The Moby semantic web framework is a popular and mature platform that is used for this purpose. However, the number of services that are available to select from when building a workflow is becoming unmanageable for users. As such, attempts have been made to assist with service selection and composition. These tasks fall under the general label of automated service composition. We present a prototype workflow assembly client that reduces the number of choices that users have to make by (1) restricting the overall set of services presented to them and (2) ranking services so that the the most desirable ones are presented first. We demonstrate via an evaluation of this prototype that a unification of relatively simple techniques can rank desirable services highly while maintaining interactive response times.

  19. Implement Framework of Semantic Web Service Composition%语义Web服务组合实现框架研究

    Institute of Scientific and Technical Information of China (English)

    郭颂; 柳春华; 周明林

    2011-01-01

    针对不同的Web服务提供商提供的Web服务进行组合存在的异构性问题,提出了基于语义的Web服务组合实现框架.该框架详细阐述了语义Web服务选择策略、组合关系设定、组合Web服务内部各成员之间的数据传输及调用机制等组合实现过程中的关键技术.它在语义层次上对现有Web服务进行了语义描述,很好地解决了现有Web服务语法上的异构问题,有效地改善了Web服务的组合质量.%A new framework of Web service composition based on the semantic is proposed after analyzing the heterogeneity of the existing Web service provided by the disparate provider. This framework expatiate the key technologies of Web service composition, such as the selection strategy of Web service, the design of composition connection, the data transmission and invocation mechanism between member Web services inside the composition Web service, and so on. The framework semantically descript Web service on the semantic level,primely resolve the heterogeneity of Web service in syntax,and effectively improve the quality of Web service composition.

  20. Composite Design Pattern for Feature Oriented Service Injection and Composition of Web Services for Distributed Computing Systems with Service Oriented Architecture

    Directory of Open Access Journals (Sweden)

    Vishnuvardhan Mannava

    2012-08-01

    Full Text Available With the advent of newly introduced programming models like Feature-Oriented Programming (FOP, we feel that it will be more flexible to include the new service invocation function into the service providing server as a Feature Module for the self-adaptive distributed systems. A composite design patterns shows a synergy that makes the composition more than just the sum of its parts which leads to ready-made software architectures. In this paper we describe the amalgamation of Visitor and Case-Based Reasoning Design Patterns to the development of the Service Invocation and Web Services Composition through SOA with the help of JWS technologies and FOP. As far as we know, there are no studies on composition of design patterns for self adaptive distributed computing domain. We have provided with the sample code developed for the application and simple UML class diagram is used to describe the architecture.

  1. Planning With Incomplete Knowledge for the Composition of Web Services

    Science.gov (United States)

    2005-08-01

    p1 ,p2,…, pn) be a sequence of atomic processes defined in K. Then P is a composition for C with respect to K in S0 iff in action theory , we can...prove: )),(,,(| 00 SadoSDo r δ=Σ where • Σ is the axiomatization of K and S0 as defined in action theory • δC is the complex action defined for...C as defined in action theory • ai is the primitive action defined for pi as defined in action theory Note that this definition is for offline

  2. Composition of web services using Markov decision processes and dynamic programming.

    Science.gov (United States)

    Uc-Cetina, Víctor; Moo-Mena, Francisco; Hernandez-Ucan, Rafael

    2015-01-01

    We propose a Markov decision process model for solving the Web service composition (WSC) problem. Iterative policy evaluation, value iteration, and policy iteration algorithms are used to experimentally validate our approach, with artificial and real data. The experimental results show the reliability of the model and the methods employed, with policy iteration being the best one in terms of the minimum number of iterations needed to estimate an optimal policy, with the highest Quality of Service attributes. Our experimental work shows how the solution of a WSC problem involving a set of 100,000 individual Web services and where a valid composition requiring the selection of 1,000 services from the available set can be computed in the worst case in less than 200 seconds, using an Intel Core i5 computer with 6 GB RAM. Moreover, a real WSC problem involving only 7 individual Web services requires less than 0.08 seconds, using the same computational power. Finally, a comparison with two popular reinforcement learning algorithms, sarsa and Q-learning, shows that these algorithms require one or two orders of magnitude and more time than policy iteration, iterative policy evaluation, and value iteration to handle WSC problems of the same complexity.

  3. Decentralized Orchestration of Composite Ogc Web Processing Services in the Cloud

    Science.gov (United States)

    Xiao, F.; Shea, G. Y. K.; Cao, J.

    2016-09-01

    Current web-based GIS or RS applications generally rely on centralized structure, which has inherent drawbacks such as single points of failure, network congestion, and data inconsistency, etc. The inherent disadvantages of traditional GISs need to be solved for new applications on Internet or Web. Decentralized orchestration offers performance improvements in terms of increased throughput and scalability and lower response time. This paper investigates build time and runtime issues related to decentralized orchestration of composite geospatial processing services based on OGC WPS standard specification. A case study of dust storm detection was demonstrated to evaluate the proposed method and the experimental results indicate that the method proposed in this study is effective for its ability to produce the high quality solution at a low cost of communications for geospatial processing service composition problem.

  4. DECENTRALIZED ORCHESTRATION OF COMPOSITE OGC WEB PROCESSING SERVICES IN THE CLOUD

    Directory of Open Access Journals (Sweden)

    F. Xiao

    2016-09-01

    Full Text Available Current web-based GIS or RS applications generally rely on centralized structure, which has inherent drawbacks such as single points of failure, network congestion, and data inconsistency, etc. The inherent disadvantages of traditional GISs need to be solved for new applications on Internet or Web. Decentralized orchestration offers performance improvements in terms of increased throughput and scalability and lower response time. This paper investigates build time and runtime issues related to decentralized orchestration of composite geospatial processing services based on OGC WPS standard specification. A case study of dust storm detection was demonstrated to evaluate the proposed method and the experimental results indicate that the method proposed in this study is effective for its ability to produce the high quality solution at a low cost of communications for geospatial processing service composition problem.

  5. Semantic web services for web databases

    CERN Document Server

    Ouzzani, Mourad

    2011-01-01

    Semantic Web Services for Web Databases introduces an end-to-end framework for querying Web databases using novel Web service querying techniques. This includes a detailed framework for the query infrastructure for Web databases and services. Case studies are covered in the last section of this book. Semantic Web Services For Web Databases is designed for practitioners and researchers focused on service-oriented computing and Web databases.

  6. Services composition based on Web service calculation%基于服务计算的服务组合研究

    Institute of Scientific and Technical Information of China (English)

    王淑蓉; 王长元; 喻钧

    2012-01-01

    通过分析现有Web服务组合系统的组合方式及特点,将服务计算引入到Web服务组合领域,提出了基于服务计算的Web服务组合系统方法,设计了基于服务计算的服务组合模型.通过松散耦合的服务组合模型来实现Web服务组合,可为服务消费者提供一个适当的、开放的、按需配置的安全的Web服务组合环境.%The service computation is introduced to Web service composition area on the basis of analyzing the combination modes and characteristics of the existing Web service composition systems. A novel Web service composition method based on service computation is proposed. A service composition model based on service computation was designed. The Web service composition was realized with the loosely-coupled service composition model. It can provide the consumers with a proper, open and safe Web services environment configured on demand.

  7. A Reliability Calculation Method for Web Service Composition Using Fuzzy Reasoning Colored Petri Nets and Its Application on Supercomputing Cloud Platform

    Directory of Open Access Journals (Sweden)

    Ziyun Deng

    2016-09-01

    Full Text Available In order to develop a Supercomputing Cloud Platform (SCP prototype system using Service-Oriented Architecture (SOA and Petri nets, we researched some technologies for Web service composition. Specifically, in this paper, we propose a reliability calculation method for Web service compositions, which uses Fuzzy Reasoning Colored Petri Net (FRCPN to verify the Web service compositions. We put forward a definition of semantic threshold similarity for Web services and a formal definition of FRCPN. We analyzed five kinds of production rules in FRCPN, and applied our method to the SCP prototype. We obtained the reliability value of the end Web service as an indicator of the overall reliability of the FRCPN. The method can test the activity of FRCPN. Experimental results show that the reliability of the Web service composition has a correlation with the number of Web services and the range of reliability transition values.

  8. 基于语义Web Service的模型自动组合综述%Survey of Automatic Model Composition Based on Semantic Web Service

    Institute of Scientific and Technical Information of China (English)

    黄辉; 陈学广; 王志武

    2013-01-01

    回顾了DSS模型管理功能中模型组合概念的提出、发展和实现.对当前分布式模型管理以及模型组合的研究现状进行了综述,比较了主流的模型自动组合设计方法各自的优缺点.由于Web Service技术的出现,以及语义Web、人工智能规划等领域的创新应用,使得模型的自动组合有了实现的可能,但同时也面临难题:目前的分布式模型组合主要借鉴Web Service的自动组合技术,通过将模型封装为模型服务来把模型组合的问题转化为Web Service组合.然而模型组合有其自身的特点,例如定性和定量模型不能直接组合,使得传统的Web Service自动组合方法不完全适用.%This paper reviewed the proposition,development and implementation of the model composition function in decision support systems (DSS).A survey of distributed model management and model composition was given,and multiple model composition methods were compared.Due to the emergence of Web Service technology,and the innovative application of both of the semantic Web and AI planning fields,the automatic composition of DSS models is possible.But some problems also exist.The distributed model composition methods mainly learn from the automatic Web service composition,and models are encapsulated into Web services.The problem of model composition is converted to Web service composition.However,model composition has its own characteristics that the traditional automatic Web service composition methods are not fully applicable,for example the direct composition of qualitative and quantitative models.

  9. A colored Petri net-based model for web service composition%一个基于有色Petri网的Web服务合成模型

    Institute of Scientific and Technical Information of China (English)

    张昭理; 洪帆; 肖海军

    2008-01-01

    In this paper, a model based colored Petri net (CPN) to provide semantic support for web service composition is proposed, and the reliability and maintainability of composite services are improved. The composite constructs in the model are sequence, concurrent, choice, loop and replace. The web service is formally defined by a CPN. A closed composing algebra is defined to obtain a framework which enables declarative composition of web services. Availability, confidentiality, and integrity of composite service are analyzed within the framework of the model based CPN.

  10. Semiautomatic Web service generation

    OpenAIRE

    Fuentes, José María de; Corella, Miguel Ángel; Castells, Pablo; Rico, Mariano

    2005-01-01

    Proceedings of the IADIS International Conference WWW/Internet 2005, held in Lisbon (Portugal). The lack of a critical mass of actually deployed web services, semantic or not, is an important hurdle for the advancement and further innovation in web service technologies. In this paper we introduce Federica, a platform for semi-automatic generation and implementation of semantic web services by exploiting existing web applications published in internet. Federica generates semantical...

  11. Ajax and Web Services

    CERN Document Server

    Pruett, Mark

    2006-01-01

    Ajax and web services are a perfect match for developing web applications. Ajax has built-in abilities to access and manipulate XML data, the native format for almost all REST and SOAP web services. Using numerous examples, this document explores how to fit the pieces together. Examples demonstrate how to use Ajax to access publicly available web services fromYahoo! and Google. You'll also learn how to use web proxies to access data on remote servers and how to transform XML data using XSLT.

  12. A Collaborative System Software Solution for Modeling Business Flows Based on Automated Semantic Web Service Composition

    Directory of Open Access Journals (Sweden)

    Ion SMEUREANU

    2009-01-01

    Full Text Available Nowadays, business interoperability is one of the key factors for assuring competitive advantage for the participant business partners. In order to implement business cooperation, scalable, distributed and portable collaborative systems have to be implemented. This article presents some of the mostly used technologies in this field. Furthermore, it presents a software application architecture based on Business Process Modeling Notation standard and automated semantic web service coupling for modeling business flow in a collaborative manner. The main business processes will be represented in a single, hierarchic flow diagram. Each element of the diagram will represent calls to semantic web services. The business logic (the business rules and constraints will be structured with the help of OWL (Ontology Web Language. Moreover, OWL will also be used to create the semantic web service specifications.

  13. 基于社团服务链的Web服务组合方法%Web service composition method based on community service chain

    Institute of Scientific and Technical Information of China (English)

    何丽; 赵富强; 饶俊

    2013-01-01

    针对Web服务组合的时间效率提高问题,提出了一种基于服务社团和服务链的Web服务组合方法.在构造的服务网络上应用基于信息中心度的服务社团发现方法,将Web服务网络划分为不同的服务社团,然后构造了社团服务链发现算法和基于服务链的Web服务组合算法,这些算法将服务社团内Web服务之间的所有可组合关联转变成服务链,实现了基于社团服务链和服务质量(QoS)剪枝的Web服务组合过程.实验结果表明,与传统的图深度遍历Web服务组合方法相比,基于社团服务链的Web服务组合方法在5个测试集上的响应时间平均提高了46%,最好情况为67%.社团服务链可以有效地减少针对当前服务请求的服务搜索空间,提高服务组合的时间效率.%A new Web service composition method based on service communities and service chains was proposed in this paper to improve the time efficiency of service composition. In the method, a service network was constructed for the Web service collection, the service community discovery algorithm based on information center was applied to find service clubs in the service network, and then the community service chain discovery algorithm and Web service composition algorithm based on service chain were built. With these algorithms, all of service interface associations in a service club were changed into service chains, and the Web service composition process based on community service chains and Quality of Service ( QoS) pruning was implemented. The experimental results indicate that, compared with the traditional service composition method based on graph depth traversal, the response time on five test sets in the service composition method with community service chains is on average improved by 42%, and up to 67%. Community service chains can effectively reduce the service search space for the current service request and improve the time efficiency of service composition.

  14. WSC/ADL:Web Services组合系统体系结构描述语言%WSC/ADL: An Architecture Description Language for Web Services Composition System

    Institute of Scientific and Technical Information of China (English)

    杨鑫; 陈俊亮

    2006-01-01

    Web services组合是Web services领域的研究热点,虽然已经提出了很多组合的方法,但从体系结构方面去研究Web services组合,则是一个新的研究角度.BPEL4WS是当前工业界主流的Web services组合描述语言.给出了基于BPEL4WS的Web services组合系统体系结构风格,并针对这种风格设计了体系结构描述语言WSC/ADL(Web services composition/architecture description language),WSC/ADL是基于体系结构的、自顶向下的Web services组合开发的研究基础,其组成包含描述Web services的服务构件、描述Web services之间交互的连接件以及建立服务构件和连接件实例联系的配置.给出了WSC/ADL的详细分析介绍和实例说明,并与相关工作进行了比较.

  15. RESTful Web Services Cookbook

    CERN Document Server

    Allamaraju, Subbu

    2010-01-01

    While the REST design philosophy has captured the imagination of web and enterprise developers alike, using this approach to develop real web services is no picnic. This cookbook includes more than 100 recipes to help you take advantage of REST, HTTP, and the infrastructure of the Web. You'll learn ways to design RESTful web services for client and server applications that meet performance, scalability, reliability, and security goals, no matter what programming language and development framework you use. Each recipe includes one or two problem statements, with easy-to-follow, step-by-step i

  16. Towards automated processing of the right of access in inter-organizational Web Service compositions

    DEFF Research Database (Denmark)

    Herkenhöner, Ralph; De Meer, Hermann; Jensen, Meiko

    2010-01-01

    with trade secret protection. In this paper, we present an automated architecture to enable exercising the right of access in the domain of inter-organizational business processes based on Web Services technology. Deriving its requirements from the legal, economical, and technical obligations, we show...

  17. Towards automated processing of the right of access in inter-organizational Web Service compositions

    DEFF Research Database (Denmark)

    Herkenhöner, Ralph; De Meer, Hermann; Jensen, Meiko;

    2010-01-01

    with trade secret protection. In this paper, we present an automated architecture to enable exercising the right of access in the domain of inter-organizational business processes based on Web Services technology. Deriving its requirements from the legal, economical, and technical obligations, we show...

  18. Implementation of OGC Web Map Service Based on Web Service

    Institute of Scientific and Technical Information of China (English)

    JIA Wenjue; CHEN Yumin; GONG Jianya

    2004-01-01

    OGC Web Map Service is one kind of OGC Portrayal Services belongs to OGC Web Service model and it provides multi-platform interoperability of spatial data set. This paper presents a method for implementing OGC Web Map Service based on Web Service technique and introduces the detailed process.

  19. Programming NET Web Services

    CERN Document Server

    Ferrara, Alex

    2007-01-01

    Web services are poised to become a key technology for a wide range of Internet-enabled applications, spanning everything from straight B2B systems to mobile devices and proprietary in-house software. While there are several tools and platforms that can be used for building web services, developers are finding a powerful tool in Microsoft's .NET Framework and Visual Studio .NET. Designed from scratch to support the development of web services, the .NET Framework simplifies the process--programmers find that tasks that took an hour using the SOAP Toolkit take just minutes. Programming .NET

  20. Chapter 59: Web Services

    Science.gov (United States)

    Graham, M. J.

    Web services are a cornerstone of the distributed computing infrastructure that the VO is built upon yet to the newcomer, they can appear to be a black art. This perception is not helped by the miasma of technobabble that pervades the subject and the seemingly impenetrable high priesthood of actual users. In truth, however, there is nothing conceptually difficult about web services (unsurprisingly any complexities will lie in the implementation details) nor indeed anything particularly new. A web service is a piece of software available over a network with a formal description of how it is called and what it returns that a computer can understand. Note that entities such as web servers, ftp servers and database servers do not generally qualify as they lack the standardized description of their inputs and outputs. There are prior technologies, such as RMI, CORBA, and DCOM, that have employed a similar approach but the success of web services lies predominantly in its use of standardized XML to provide a language-neutral way for representing data. In fact, the standardization goes further as web services are traditionally (or as traditionally as five years will allow) tied to a specific set of technologies (WSDL and SOAP conveyed using HTTP with an XML serialization). Alternative implementations are becoming increasingly common and we will cover some of these here. One important thing to remember in all of this, though, is that web services are meant for use by computers and not humans (unlike web pages) and this is why so much of it seems incomprehensible gobbledegook. In this chapter, we will start with an overview of the web services current in the VO and present a short guide on how to use and deploy a web service. We will then review the different approaches to web services, particularly REST and SOAP, and alternatives to XML as a data format. We will consider how web services can be formally described and discuss how advanced features such as security, state

  1. Mastering Go web services

    CERN Document Server

    Kozyra, Nathan

    2015-01-01

    If you are a web programmer with experience in developing web services and have a rudimentary knowledge of using Go, then this is the book for you. Basic knowledge of Go as well as knowledge of relational databases and non-relational NoSQL datastores is assumed. Some basic concurrency knowledge is also required.

  2. Airport Status Web Service

    Data.gov (United States)

    Department of Transportation — A web service that allows end-users the ability to query the current known delays in the National Airspace System as well as the current weather from NOAA by airport...

  3. Implementing reliable Web services

    OpenAIRE

    Koskipää, Otto

    2012-01-01

    Web services are a common and standard way to implement communication between information systems and provide documented interfaces. The Web services are usually using SOAP because it is a widely-spread, well-documented and used standard. SOAP standard defines a message structure, an envelope, that is sent over internet using HTTP and contains XML data. An important part of the SOAP structure is the exception mechanism that returns a Fault element in the response. The SOAP Fault is a stan...

  4. Composite Design Pattern for Feature Oriented Service Injection and Composition of Web Services for Distributed Computing Systems with Service Oriented Architecture

    OpenAIRE

    Vishnuvardhan Mannava; Ramesh, T.

    2012-01-01

    With the advent of newly introduced programming models like Feature-Oriented Programming (FOP), we feel that it will be more flexible to include the new service invocation function into the service providing server as a Feature Module for the self-adaptive distributed systems. A composite design patterns shows a synergy that makes the composition more than just the sum of its parts which leads to ready-made software architectures. In this paper we describe the amalgamation of Visitor and Case...

  5. Distributed Management of Concurrent Web Service Transactions

    DEFF Research Database (Denmark)

    Alrifai, Mohammad; Dolog, Peter; Balke, Wolf-Tilo

    2009-01-01

    Business processes involve dynamic compositions of interleaved tasks. Therefore, ensuring reliable transactional processing of Web services is crucial for the success of Web service-based B2B and B2C applications. But the inherent autonomy and heterogeneity of Web services render the applicability...... of conventional ACID transaction models for Web services far from being straightforward. Current Web service transaction models relax the isolation property and rely on compensation mechanisms to ensure atomicity of business transactions in the presence of service failures. However, ensuring consistency...... in the open and dynamic environment of Web services, where interleaving business transactions enter and exit the system independently, remains an open issue. In this paper, we address this problem and propose an architecture that supports concurrency control on the Web services level. An extension...

  6. Web服务动态组合中QoS计算方法研究%Research on Quality of Service Computing Method in Web Services Dynamic Composition

    Institute of Scientific and Technical Information of China (English)

    张琦; 侯红

    2011-01-01

    通过在Web服务动态组合中引入形式化的服务质量(QoS)描述、服务提供商因子、服务消费者因子,提出基于层次分析法的QoS计算方法.该方法根据服务消费者期望值选择QoS因子,利用QoS权重值计算Web服务的质量,在此基础上给出一个基于QoS计算的Web服务组合模型,并通过实例计算,证明利用该QoS计算方法可以得到更高质量的增值服务.%By introducing formal Quality of Service(QoS) description, service provider factor, service consumer factor in Web services dynamic composition, a method of QoS computing based on Analytic Hierarchy Process(AHP) is proposed.It selects QoS factors according to service consumer expectations, computes the quality of Web service with QoS weight, and proposes a QoS-based Web services dynamic composition model.An example is provided to prove that higher quality value-added services can be obtained with the computing method proposed.

  7. Web services development in Java

    OpenAIRE

    Porenta, Dane

    2012-01-01

    We focused on web services and their development. We presented two of the most common types of web services: SOAP and REST web services. We showed how they work, how to develop and ways how client can invoke them. Looking into SOAP web service details we described it's SOAP protocol and WSDL file for describing web service. We also described WS–* specifications and WS–I Basic Profile, which helps with interoperability. After describing SOAP web services, we described REST web services. Here w...

  8. Analyzing Web Service Contracts

    DEFF Research Database (Denmark)

    Cambronero, M.-Emilia; Okika, Joseph C.; Ravn, Anders Peter

    2007-01-01

    Web services should be dependable, because businesses rely on them. For that purpose the Service Oriented Architecture has standardized specifications at a syntactical level. In this paper, we demonstrate how such specifications are used to derive semantic models in the form of (timed) automata...

  9. Distributed Web Service Repository

    Directory of Open Access Journals (Sweden)

    Piotr Nawrocki

    2015-01-01

    Full Text Available The increasing availability and popularity of computer systems has resulted in a demand for new, language- and platform-independent ways of data exchange. That demand has in turn led to a significant growth in the importance of systems based on Web services. Alongside the growing number of systems accessible via Web services came the need for specialized data repositories that could offer effective means of searching of available services. The development of mobile systems and wireless data transmission technologies has allowed the use of distributed devices and computer systems on a greater scale. The accelerating growth of distributed systems might be a good reason to consider the development of distributed Web service repositories with built-in mechanisms for data migration and synchronization.

  10. Personalized Web Services for Web Information Extraction

    CERN Document Server

    Jarir, Zahi; Erradi, Mahammed

    2011-01-01

    The field of information extraction from the Web emerged with the growth of the Web and the multiplication of online data sources. This paper is an analysis of information extraction methods. It presents a service oriented approach for web information extraction considering both web data management and extraction services. Then we propose an SOA based architecture to enhance flexibility and on-the-fly modification of web extraction services. An implementation of the proposed architecture is proposed on the middleware level of Java Enterprise Edition (JEE) servers.

  11. Web服务组合的可靠性动态评估模型%Reliability dynamic evaluation model of Web services composition

    Institute of Scientific and Technical Information of China (English)

    梁员宁; 陈喆; 谢立军

    2012-01-01

    为了合理、高效、动态地评估Web服务组合的可靠性,为服务请求者提供高质量的组合服务,提出了一个Web服务组合的可靠性动态评估模型.该模型对服务提供者发布至UDDI注册中心的Web服务进行语义预先处理,根据语义Web服务间的逻辑组合关系,基于预推理技术构造Web服务的自动组合框架,提出了Web服务的自动组合算法,建立Web服务组合方案的路径结构;利用随机Petri网对满足服务请求者需求的服务组合路径结构进行可靠性建模,结合在线获取的Web服务可靠性信息,对Web服务组合的可靠性进行动态评估.实验示例结果分析表明,提出的模型能确保Web服务组合方案的有效性和提高服务组合的效率,对Web服务组合的可靠性评估具有较强动态性和灵活适应性.%To evaluate the reliability of Web service composition logically, efficiently and dynamically, and afford a high quality composite service for service applicant, this paper proposed a reliability dynamic evaluation model of Web services composition. The model foreclosed the semantic to the Web services of UDDI(universal description, discovery and integration) register center which issued by the services providers. According to the logic of the combination between semantic Web services relationship, basing on the reasoning technology to construct an automatic combination frame, this paper put forward an automatic combination algorithm, and set up the path structures of Web service composite schemes. And it then established the reliability models for the service composite path structures which satisfied the requirement of services applicants by stochastic Petri net, evaluated the reliability of Web services composition dynamically combining the online reliability information of Web services. The experiment results indicate that the model can insure the validity of the Web service composite schemes and enhance the efficiency of services

  12. Complex networks and SOA: Mathematical modelling of granularity based web service compositions

    Indian Academy of Sciences (India)

    S Chatla; S Kadam; D Kolluru; S Sinha; A Viswandhuni; A Vaidya

    2011-08-01

    Service Oriented Architecture (SOA) can be defined as a way of defining and implementing enterprise applications that deals with the intercommunication of loosely coupled, coarse grained (business level), reusable artifacts (services). In this paper, we attempt to mathematically model the preliminary steps in the larger problem of providing an optimal architecture. The problem is treated as a complex network, particularly a process-task-network. We employ statistical and graph-theoretic methods namely, Jaccard’s distance analysis, Multiple Correspondence method and the Minimum Spanning Tree method, to find appropriate clusters. These methods are used to cluster tasks across business processes to propose services. Additional properties and features of these clusters are discussed. We propose a leverage factor which demonstrates the importance of a task within the service and its impact on service composition.

  13. 语义标记Petri网的组合Web服务建模与验证%Modeling and Verifying Composite Web Services Based on Semantic Annotated Petri Nets

    Institute of Scientific and Technical Information of China (English)

    雷丽晖; 段振华

    2009-01-01

    随着Web服务组合的发展,整合业务过程成为可能.组合Web服务可以被看作是基于过程的工作流.由于死锁、不安全和不可达等流的设计错误会影响组合Web服务的有效执行,因此这些错误应在组合Web服务执行前被检测出并修改.提出了基于语义标记Petri网的组合Web服务建模与验证方法.首先提出语义标记Petri网(SaPNs),并给出其语义;用受限描述逻辑tableau算法获得组合Web服务;使用SaPNs描述组合Web服务及其组成部分;最后,使用基于SaPNs的分析方法验证了组合Web服务.使用该方法在开放的Internet环境下可以获得满足客户需求的、可靠的组合Web服务.%Integrating business processes becomes practicable along with the development of Web services composition. Composite Web services can be regarded as process-based workflows. Since error design of flow structures, such as deadlock, unsafeness, non-reachability and so on, will affect composite Web services performance, these errors should be detected and corrected before composite Web services are executed. An approach for modeling and verifying composite Web services based on semantic annotated Petri Nets is proposed.Firstly, semantic annotated Petri Nets (SaPNs) is presented and the semantics of SaPNs is given. Secondly, a restricted description logic tableau algorithm is utilized to obtain composite Web services. Thirdly, SaPNs is used to represent a composite Web service and the participating services that are invoked by this composite Web service.Finally, the composite Web services represented with the SaPN are verified by means of some analysis methods based on SaPNs. With this approach, a reliable composite Web services meeting client requirements in an open Internet environment can be achieved.

  14. 一种基于图和本体的Web服务合成算法%A Composition Algorithm of Web Service Based on Graph and Ontology

    Institute of Scientific and Technical Information of China (English)

    王孝强

    2012-01-01

    To achieve the automation and efficiency of Web Service composition,the dissertation presents a new semantic-based Web Service composition algorithm,which makes full use of the graph theory knowledge and ontology reasoning function.Firstly,the set of services available is constructed using ontology reasoning function.Then,service composition graph Web Service Composition Graph(WSCG) is constructed by sub-step.Finally,the solution of Web Service composition is selected using graph searching algorithm.It′s proved that the method has a good success rate and efficiency.%为了实现Web服务合成的自动化、高效化,给出了一种支持语义的Web服务合成算法。该算法首先利用本体的推理功能实现可用服务集的构造,其次采用分步法进行服务合成图(Web ServiceComposition Graph,WSCG)的构造,最后通过图的搜索技术实现合成方案的选择,经实验测试表明该算法具有良好的合成效率和成功率。

  15. Bootstrapping quality of Web Services

    Directory of Open Access Journals (Sweden)

    Zainab Aljazzaf

    2015-07-01

    Full Text Available A distributed application may be composed of global services provided by different organizations and having different properties. To select a service from many similar services, it is important to distinguish between them. Quality of services (QoS has been used as a distinguishing factor between similar services and plays an important role in service discovery, selection, and composition. Moreover, QoS is an important contributing factor to the evolution of distributed paradigms, such as service-oriented computing and cloud computing. There are many research works that assess services and justify the QoS at the finding, composition, or binding stages of services. However, there is a need to justify the QoS once new services are registered and before any requestors use them; this is called bootstrapping QoS. Bootstrapping QoS is the process of evaluating the QoS of the newly registered services at the time of publishing the services. Thus, this paper proposes a QoS bootstrapping solution for Web Services and builds a QoS bootstrapping framework. In addition, Service Oriented Architecture (SOA is extended and a prototype is built to support QoS bootstrapping. Experiments are conducted and a case study is presented to test the proposed QoS bootstrapping solution.

  16. Programming Web services with Perl

    CERN Document Server

    Ray, Randy J

    2003-01-01

    Given Perl's natural fit for web applications development, it's no surprise that Perl is also a natural choice for web services development. It's the most popular web programming language, with strong implementations of both SOAP and XML-RPC, the leading ways to distribute applications using web services. But books on web services focus on writing these applications in Java or Visual Basic, leaving Perl programmers with few resources to get them started. Programming Web Services with Perl changes that, bringing Perl users all the information they need to create web services using their favori

  17. Web服务组合的层次化建模%Hierarchical models of Web service composition

    Institute of Scientific and Technical Information of China (English)

    王玉英; 陈平

    2013-01-01

    目的 形式化地描述Web服务组合流程,为更好地使用工具和现有方法验证以及测试Web服务组合奠定基础.方法 用有色Petri网对BPEL的每种活动建模,分析BPEL中<scope>、<compensation>、<faultHandlers>和<terminationHandlers>几种活动的共同作用,分析BPEL流程的错误处理机制和补偿机制;从网资源流动的角度完善现有的层次化有色Petri网定义,将BPEL流程的层次关系映射成层次化有色Petri网的层次关系.结果 完善了层次化有色Petri网定义,提出了Web服务组合的层次化建模方法.结论 层次化构建Web服务组合模型是一种可以用于大型BPEL流程的方法,所构建的模型有利于从抽象层面和细节上分析Web服务组合.%Aim To describe Web service composition formally for model checking and testing of Web service composition by available tools and methods. Methods Modeling each activity of BPEL process by using colored Petri nets, analyzing the interaction of BPEL's , , , and , and BPEL's fault and compensation mechanism as well. The definition of hierarchical colored Petri net is developed in respect to the net resource flow, and the hierarchies of BPEL process are projected into the hierarchies of hierarchical colored Petri nets. Results The hierarchical colored Petri net definition is improved and an approach on modeling Web service composition is proposed. Conclusion These models are applicable to large BPEL processes. It is benefit for the analysis Web service composition on both abstract and detail level.

  18. WEB SERVICE COMPOSITION PLANNING AND OPTIMAL SELECTION BASED ON FUNCTION PARTITION MAP%基于功能划分图的 Web 服务组合规划和最优选择

    Institute of Scientific and Technical Information of China (English)

    吴芳; 朱尚明

    2016-01-01

    To expand the composition mode of Web service types,implement seamless Web service composition and improve the reliability of service composition are the focuses of current Web service composition research.Considering the diversity of Web service composition modes and the seamless service composition issue,we calculate the candidate service types applicable to the service composition based on the function partition map of service,dynamically plan the composition mode of various service types,and propose an assembly algorithm of the first stage service type.Aiming at the reliability issue of service composition,we express the operating environment required by Web service itself and the preferential conditions of its own as the context,and propose the correlated local optimum and global optimum selection algorithms to find the real service composition with high reliability.Finally,we verify the performances of the assembly algorithm of first stage service type,the local optimum and the global optimum selection algorithms through simulation experiments.%扩展 Web 服务类型的组合方式、实现服务的无缝组合和提高服务组合的可靠性是当今 Web 服务组合的研究热点。针对Web 服务类型组合方式多样性和无缝服务组合问题,根据请求服务的功能划分图来计算可用于服务组合的候选服务类型,动态规划各种服务类型的组合方式,并提出第一级服务类型的装配算法。针对服务组合的可靠性问题,将 Web 服务自身对运行环境的要求和自身的优先条件表示为上下文,并提出相应的局部最优选择算法和全局最优选择算法,以找到真实的、具有高可靠性的服务组合。最后,通过仿真实验验证了第一级服务类型装配算法、局部最优和全局最优选择算法的性能。

  19. Discovery and Selection of Semantic Web Services

    CERN Document Server

    Wang, Xia

    2013-01-01

    For advanced web search engines to be able not only to search for semantically related information dispersed over different web pages, but also for semantic services providing certain functionalities, discovering semantic services is the key issue. Addressing four problems of current solution, this book presents the following contributions. A novel service model independent of semantic service description models is proposed, which clearly defines all elements necessary for service discovery and selection. It takes service selection as its gist and improves efficiency. Corresponding selection algorithms and their implementation as components of the extended Semantically Enabled Service-oriented Architecture in the Web Service Modeling Environment are detailed. Many applications of semantic web services, e.g. discovery, composition and mediation, can benefit from a general approach for building application ontologies. With application ontologies thus built, services are discovered in the same way as with single...

  20. A Semantically Automated Protocol Adapter for Mapping SOAP Web Services to RESTful HTTP Format to Enable the Web Infrastructure, Enhance Web Service Interoperability and Ease Web Service Migration

    OpenAIRE

    Frank Doheny; Paul Jacob; Maria Maleshkova; Owen Molloy; Robert Stewart; Sean Kennedy

    2012-01-01

    Semantic Web Services (SWS) are Web Service (WS) descriptions augmented with semantic information. SWS enable intelligent reasoning and automation in areas such as service discovery, composition, mediation, ranking and invocation. This paper applies SWS to a previous protocol adapter which, operating within clearly defined constraints, maps SOAP Web Services to RESTful HTTP format. However, in the previous adapter, the configuration element is manual and the latency implications are locally b...

  1. Service Composition on a Mobile Phone

    OpenAIRE

    MÀntysaari, Ville

    2007-01-01

    With the recent increase in interest in service-oriented architectures (SOA) and Web services, developing applications with the Web services paradigm has become feasible. Web services are self-describing, platform-independent computational elements. New applications can be assembled from a set of previously created Web services, which are composed together to make a service that uses its components to perform a certain task. This is the idea of service composition. To bring service compo...

  2. 基于工作流模板的Web服务组合模型研究%Research on Web Services Composition Model Based on Workflow Template

    Institute of Scientific and Technical Information of China (English)

    李顺新; 凌海洋; 江南

    2009-01-01

    Web services composition is an important research field of service applications. By the similarity between workflow and Web services composition, a new Web services composition model based on workflow template is proposed. In this model, the workflow and Web service can be found more accurately by using the advantage of the functional semantics. The Agent method is used to execute the composition flow. Finally, the template flow and the Web service are published to the register library by using the publishing algorithm.%服务组合是Web服务应用的一个重要研究方向,利用工作流与服务组合的相似性,提出了一种基于工作流模板的Web服务组合模型;该模型利用功能语义在服务匹配上的优点,对流程、服务进行较为准确的查询;并通过Agent技术来执行组合方案;最后结合服务发布算法,将组合后的服务和流程发布在注册库中.

  3. RESTful web services with Dropwizard

    CERN Document Server

    Dallas, Alexandros

    2014-01-01

    A hands-on focused step-by-step tutorial to help you create Web Service applications using Dropwizard. If you are a software engineer or a web developer and want to learn more about building your own Web Service application, then this is the book for you. Basic knowledge of Java and RESTful Web Service concepts is assumed and familiarity with SQL/MySQL and command-line scripting would be helpful.

  4. 一种基于CBR和多Agent的Web服务个性化组合%A PERSONALIZED COMPOSITION OF WEB SERVICES BASED ON CBR AND MULTI-AGENTS

    Institute of Scientific and Technical Information of China (English)

    赵伟伟; 董东; 王昆; 孙兆豪

    2012-01-01

    Abstract Customer satisfaction is one of the important indicators to measure web service composition. To overcome the shortage of customer satisfaction in web services composition, the article proposes a personalized web service composition algorithm based on CBR and multi-agents. Founded on the definition of web services customer satisfaction attributes, an attribute preference weight vector solving model is built. Moreover, by searching for service combination optimal solution through multi-objective planning, the personalization of web service combination is realized. A prototype system has demonstrated its feasibility.%客户的满意度是衡量Web服务组合的重要指标之一.为解决Web服务组合中客户满意度的缺失问题,提出一种基于CBR( Case-based Reasoning)和多Agent的个性化的Web服务组合算法.在给出Web服务客户满意度属性的定义基础之上,建立了属性偏好的权重向量求解模型,并通过多目标规划寻找服务组合的最优解,从而实现了Web服务组合的个性化.原型系统表明了其可行性.

  5. Web Services Integration on the Fly

    Science.gov (United States)

    2008-12-01

    22 K. WEB SERVICES CHOREOGRAPHY DESCRIPTION LANGUAGE (WS-CDL...Intelligent Framework WSBPEL Web Services Business Process Execution Language WS-CDL Web Services Choreography Description Language WSDL Web...Language (WSBPEL) is a related technology addressing service orchestration. Web Services Choreography and Web Services Security are important areas

  6. The EMBRACE web service collection.

    Science.gov (United States)

    Pettifer, Steve; Ison, Jon; Kalas, Matús; Thorne, Dave; McDermott, Philip; Jonassen, Inge; Liaquat, Ali; Fernández, José M; Rodriguez, Jose M; Pisano, David G; Blanchet, Christophe; Uludag, Mahmut; Rice, Peter; Bartaseviciute, Edita; Rapacki, Kristoffer; Hekkelman, Maarten; Sand, Olivier; Stockinger, Heinz; Clegg, Andrew B; Bongcam-Rudloff, Erik; Salzemann, Jean; Breton, Vincent; Attwood, Teresa K; Cameron, Graham; Vriend, Gert

    2010-07-01

    The EMBRACE (European Model for Bioinformatics Research and Community Education) web service collection is the culmination of a 5-year project that set out to investigate issues involved in developing and deploying web services for use in the life sciences. The project concluded that in order for web services to achieve widespread adoption, standards must be defined for the choice of web service technology, for semantically annotating both service function and the data exchanged, and a mechanism for discovering services must be provided. Building on this, the project developed: EDAM, an ontology for describing life science web services; BioXSD, a schema for exchanging data between services; and a centralized registry (http://www.embraceregistry.net) that collects together around 1000 services developed by the consortium partners. This article presents the current status of the collection and its associated recommendations and standards definitions.

  7. The EMBRACE web service collection

    DEFF Research Database (Denmark)

    Pettifer, S.; Ison, J.; Kalas, M.

    2010-01-01

    The EMBRACE (European Model for Bioinformatics Research and Community Education) web service collection is the culmination of a 5-year project that set out to investigate issues involved in developing and deploying web services for use in the life sciences. The project concluded that in order...... for web services to achieve widespread adoption, standards must be defined for the choice of web service technology, for semantically annotating both service function and the data exchanged, and a mechanism for discovering services must be provided. Building on this, the project developed: EDAM......, an ontology for describing life science web services; BioXSD, a schema for exchanging data between services; and a centralized registry (http://www.embraceregistry.net) that collects together around 1000 services developed by the consortium partners. This article presents the current status of the collection...

  8. 基于改进遗传算法的 Web 服务优化组合研究%ON OPTIMISATION OF WEB SERVICE COMPOSITION BASED ON IMPROVED GENETIC ALGORITHM

    Institute of Scientific and Technical Information of China (English)

    徐甜; 刘凌霞

    2016-01-01

    为了获得更优的 Web 服务优化组合方案,提出一种基于改进遗传算法的 Web 服务优化组合方法。首先将 Web 服务组合优化方案的可行解看作遗传算法的个体。然后通过遗传算法模拟自然界的生物进化过程,找到 Web 服务组合的最优解,同时在标准遗传算法引入多尺度交叉算子和信息共享因子,提高问题的求解速度。最后进行仿真对比实验。结果表明,改进遗传算法可以快速、准确找到 Web 服务组合问题的最优解,为解决 Web 服务组合问题提出了一种新的解决思路。%In order to obtain better optimisation scheme of Web service composition,this paper proposes an optimisation method which is based on the improved genetic algorithm.First,it deems the feasible optimisation scheme of Web service composition as the individual of genetic algorithm,and then simulates the biological evolution in nature through genetic algorithm to find optimal solution of Web service composition;meanwhile it introduces multi-scale crossover operator and information sharing factor to standard genetic algorithm to improve problem’s solving speed.Finally we carry out the comparative experiments in simulation.Results show that the improved genetic algorithm can find the optimal solution of Web service composition problem quickly and accurately,this provides a new solution idea to the problem of Web service composition.

  9. 关于Web服务组合的有效Web服务发现机制%Effective web services discovery strategy for web services composition

    Institute of Scientific and Technical Information of China (English)

    钱雪忠; 孙华峰

    2007-01-01

    随着Web Services的广泛流行,怎样发现适当Web Services来支持Web Services的组合已经成为一种挑战.由于传统的关键字搜索具有太低的记忆性和精确性,因此这种方法是很低效的.基于Web Services的描述信息,介绍了一种有效的Web Services发现机制.此服务发现方法是简单可用的,通过引入语义变得十分高效,因此该机制成功的在服务组合模型上得到了实现.

  10. Secure Sessions for Web Services

    NARCIS (Netherlands)

    Reiter, M.; Bhargavan, K.; Corin, R.J.; Fournet, C.; Gordon, A.D.

    2007-01-01

    We address the problem of securing sequences of SOAP messages exchanged between web services and their clients. The WS-Security standard defines basic mechanisms to secure SOAP traffic, one message at a time. For typical web services, however, using WS-Security independently for each message is

  11. Secure Sessions for Web Services

    NARCIS (Netherlands)

    Reiter, M.; Bhargavan, K.; Corin, R.J.; Fournet, C.; Gordon, A.D.

    2007-01-01

    We address the problem of securing sequences of SOAP messages exchanged between web services and their clients. The WS-Security standard defines basic mechanisms to secure SOAP traffic, one message at a time. For typical web services, however, using WS-Security independently for each message is rath

  12. Restful Web Service in Java%Java与Restful Web Service

    Institute of Scientific and Technical Information of China (English)

    袁赟

    2007-01-01

    近年来Web服务领域发生着翻天覆地的变化,继传统的XML-RPC风格的Web Service之后,一种新的风格,REST被应用于Web Service.本文主要介绍了Rest构架风格,以及现在Java开发Restful Web Service的主要方式,以及如何实现Restful Web Service的Java和Ajax客户端,最后介绍了Restful Web Service的描述语言WADL.

  13. Towards structural web services discovery

    Institute of Scientific and Technical Information of China (English)

    CHEN Jiang-feng

    2008-01-01

    A syntactic and structural matching mechanism for service discovery was put forward, which tries to exploit the underlying semantics of web services to enhance the traditional syntactic service discovery. We commit WSDL (Web Service Description Language) as service description language. The syntactic matching mechanism is based on the textual similarity among WSDL documents using VSM (Vector Space Model). The structural information is extracted from WSDL document tree or the invocation sequence of a series of services which can be viewed as the problem of graph isomorphism. Then we combine the syntactic and structural similarity linearly to calculate the service similarity. Finally we provide a novel web services discovery framework named SG* to find the exact services meeting the users' goals based on service similarity.

  14. A Semantically Automated Protocol Adapter for Mapping SOAP Web Services to RESTful HTTP Format to Enable the Web Infrastructure, Enhance Web Service Interoperability and Ease Web Service Migration

    Directory of Open Access Journals (Sweden)

    Frank Doheny

    2012-04-01

    Full Text Available Semantic Web Services (SWS are Web Service (WS descriptions augmented with semantic information. SWS enable intelligent reasoning and automation in areas such as service discovery, composition, mediation, ranking and invocation. This paper applies SWS to a previous protocol adapter which, operating within clearly defined constraints, maps SOAP Web Services to RESTful HTTP format. However, in the previous adapter, the configuration element is manual and the latency implications are locally based. This paper applies SWS technologies to automate the configuration element and the latency tests are conducted in a more realistic Internet based setting.

  15. Java与Restful Web Service

    Institute of Scientific and Technical Information of China (English)

    袁赟

    2007-01-01

    近年来Web服务领域发生着翻天覆地的变化,继传统的XML-RPC风格的Web Service之后,一种新的风格,REST被应用于Web Service.本文主要介绍了Rest构架风格,以及现在Java开发Restful Web Service的主要方式,以及如何实现Restful Web Service的Java和Ajax客户端,最后介绍了Restful Web Service的描述语言WADL.

  16. Business aspects of web services

    CERN Document Server

    Weinhardt, Christof; Conte, Tobias

    2011-01-01

    Driven by maturing Web service technologies and the wide acceptance of the service-oriented architecture paradigm, the software industry's traditional business models and strategies have begun to change: software vendors are turning into service providers. In addition, in the Web service market, a multitude of small and highly specialized providers offer modular services of almost any kind and economic value is created through the interplay of various distributed service providers that jointly contribute to form individualized and integrated solutions. This trend can be optimally catalyzed by

  17. Design and Implementation of Service Composition System Based on WEB%基于WEB的服务组合系统设计与实现

    Institute of Scientific and Technical Information of China (English)

    农嘉

    2014-01-01

    Service composition is technical means of meeting the high-quality needs of users by reusing already existing Web services, which is the hot issue in the field of research on service-oriented architecture. By using the method of service composition based on the business flow, this paper designs and implements a Web-based service composition system, and the actual cases of service composition combined with the requirements of campus users are discussed.%服务组合是通过重用已有的Web服务满足用户高质量的应用需求的一种技术手段,是面向服务架构研究领域的热点问题。本文采用基于业务流的服务组合方式,设计并实现基于Web的服务组合系统,并结合校园用户需求给出并讨论了服务组合的实际案例。

  18. RESTful Web Services at BNL

    Energy Technology Data Exchange (ETDEWEB)

    Casella, R.

    2011-06-14

    RESTful (REpresentational State Transfer) web services are an alternative implementation to SOAP/RPC web services in a client/server model. BNLs IT Division has started deploying RESTful Web Services for enterprise data retrieval and manipulation. Data is currently used by system administrators for tracking configuration information and as it is expanded will be used by Cyber Security for vulnerability management and as an aid to cyber investigations. This talk will describe the implementation and outstanding issues as well as some of the reasons for choosing RESTful over SOAP/RPC and future directions.

  19. Programming Web Services with SOAP

    CERN Document Server

    Snell, James L; Kulchenko, Pavel

    2002-01-01

    The web services architecture provides a new way to think about and implement application-to-application integration and interoperability that makes the development platform irrelevant. Two applications, regardless of operating system, programming language, or any other technical implementation detail, communicate using XML messages over open Internet protocols such as HTTP or SMTP. The Simple Open Access Protocol (SOAP) is a specification that details how to encode that information and has become the messaging protocol of choice for Web services.Programming Web Services with SOAP is a detail

  20. Spring Web Services 2 Cookbook

    CERN Document Server

    Sattari, Hamidreza

    2012-01-01

    This is a cookbook full of recipes with the essential code explained clearly and comprehensively. Each chapter is neatly compartmentalized with focused recipes which are perfectly organized for easy reference and understanding. This book is for Java/J2EE developers. As the books covers a variety of topics in Web-Service development, it will serve as a reference guide to those already familiar with Web-Services. Beginners can also use this book to gain real-world experience of Web-Service development.

  1. The Research on Web Service based Network Management

    Directory of Open Access Journals (Sweden)

    Wenli Dong

    2010-07-01

    Full Text Available This paper proposes Web Service based network management. The Web Service based network management system is analyzed. It consists of network management layer, collaborative management implementation layer, and management function layer mainly. The complex management network tasks can be accomplished respectively by more than one Web Service distributed on Internet and the Web Services interchange information based on XML message. The SNMP/XML gateway and the translation between GDMO/ASN.1 and XML/Schema are designed and implemented to implement the integration between the legacy network management systems and the network management developed by Web Service technologies. The service management in Web Service based network management is discussed. Service composition/re-composition in Web Service based network management is analyzed based on the QoS requirements negotiation between the network management requirements and the statement of Web Service and network, OWL-S being used to described the network management requirements to discover the suitable Web Service, BPEL being used to describe the Web Service composition.

  2. Combining Skyline and local selection for heuristic Web service composition%基于Skyline和局部选择的启发式服务组合方法

    Institute of Scientific and Technical Information of China (English)

    谢海军; 齐连永; 窦万春

    2011-01-01

    为了改善现有基于QoS的Web服务组合方法的效率,在已有服务组合算法的基础上提出了一种新颖的基于Skyline点和局部选择的启发式服务组合方法SLOMIP(Skyline local optimization mixed integer programming).该方法首先从候选服务集合中选出Skyline服务,可以证明如果存在最优服务组合方案,则其一定是由Skyline服务集中的服务组成的.然后,为了进一步缩小解空间,再从Skyline服务集中选取最优的K个服务进行最终服务组合方案的优化求解.与传统启发式服务组合方法的不同之处在于,该方法一旦获得解,必然是最优解而不是次优解.实验结果表明:在固定任务总数和固定候选服务个数的情况下,该方法的效率都远高于传统方法;K值越大,该方法的准确率越高.该方法可较大幅度地提高服务组合的效率,提升用户体验.%To improve the efficiency of existing QoS-aware Web service composition methods, a novel heuristic Web service composition method, named SLOMIP (Skyline local optimization mixed integer programming), is proposed. Based on existing Web service composition methods, SLOMIP combines Skyline point and local selection methods. First, for each service class, Skyline services are determined from the set of candidate services. It can be proved that each constituent service of the optimal service composition solution belongs to the Skyline services of the corresponding service class. Next, to further reduce the solution space, top K optimal services are selected from the Skyline services of each service class, for final service composition optimization. Unlike traditional heuristic service composition methods, the composition solution determined by using this method must be the optimal solution other than a near-to-optimal solution. Experimental results demonstrate that the SLOMIP method greatly improves the service composition efficiency if the number of tasks and the number of candidate

  3. Web Service: MedlinePlus

    Science.gov (United States)

    ... an alternate method of accessing MedlinePlus data. Base URL https ://wsearch.nlm.nih.gov/ws/query Please ... the Web service. All special characters must be URL encoded. Spaces may be replaced by '+' signs, which ...

  4. SSC RESTful Web Services API

    Data.gov (United States)

    National Aeronautics and Space Administration — The Satellite Situation Center (SSC) web services allow a software developer to use portions of the SSC software in their own applications. SSC is a system to cast...

  5. Interactive Web Services with Java

    DEFF Research Database (Denmark)

    Møller, Anders; Schwartzbach, Michael Ignatieff

    This slide collection about Java Web service programming, JSP, Servlets and JWIG is created by: Anders Møller and Michael I. Schwartzbach at the BRICS research center at University of Aarhus, Denmark.......This slide collection about Java Web service programming, JSP, Servlets and JWIG is created by: Anders Møller and Michael I. Schwartzbach at the BRICS research center at University of Aarhus, Denmark....

  6. Interactive Web Services with Java

    DEFF Research Database (Denmark)

    Møller, Anders; Schwartzbach, Michael Ignatieff

    This slide collection about Java Web service programming, JSP, Servlets and JWIG is created by: Anders Møller and Michael I. Schwartzbach at the BRICS research center at University of Aarhus, Denmark.......This slide collection about Java Web service programming, JSP, Servlets and JWIG is created by: Anders Møller and Michael I. Schwartzbach at the BRICS research center at University of Aarhus, Denmark....

  7. RESTful Java web services security

    CERN Document Server

    Enríquez, René

    2014-01-01

    A sequential and easy-to-follow guide which allows you to understand the concepts related to securing web apps/services quickly and efficiently, since each topic is explained and described with the help of an example and in a step-by-step manner, helping you to easily implement the examples in your own projects. This book is intended for web application developers who use RESTful web services to power their websites. Prior knowledge of RESTful is not mandatory, but would be advisable.

  8. 融合遗传蚁群算法的Web服务组合研究%Based Web Service Composition with Genetic Algorithm and Ant Colony Optimization

    Institute of Scientific and Technical Information of China (English)

    曹腾飞; 符云清; 钟明洋

    2012-01-01

    为了提高Web服务组合流程中服务选择技术的收敛性能,提出了一种基于遗传算法与蚁群算法相融合的多目标优化策略,用于解决基于QoS的Web服务组合问题.本文首先将Web服务组合的全局最优化问题转化为寻求一条QoS最优解的路径问题,并通过改进遗传算法得到蚁群算法中初始路径的信息素分布,再通过改进蚁群算法来求得最优解.仿真实验结果表明,该改进算法能在较少的进化代数下得到最优路径,提高了Web服务组合的快速全局搜索能力.%To improve the convergence ability of service selection technology in process of Web service composition, the paper presents a multi-objective optimization strategy based on genetic algorithm and ant colony algorithm to solve global optimization problem in QoS-based Web service composition. In the paper, global optimization problem in Web service composition is presented as a QoS optimal routing problem. And then, an improved genetic algorithm is proposed to get pheromone distribution in initial route of ant colony algorithm. At last, an improved ant colony algorithm is presented to get the optimal solution. Simulation result suggests that the improved algorithms can get the optimal routing in less evolutional generation than typical algorithms, and improve global research ability in Web Service compositioa

  9. Towards a service-oriented MDA-based approach to the alignment of business processes with IT systems: From the business model to a web service composition model

    NARCIS (Netherlands)

    De Castro, Valeria; Marcos, Esperanza; Wieringa, Roelf J.

    2009-01-01

    In recent years, the automation of business processes has become one of the most prominent and promising uses of Web service technology. Consequently several languages have been created for the execution of business processes, making it possible to define new and more complex services or business

  10. Web Services in Mobile Applications

    Directory of Open Access Journals (Sweden)

    Octavian DOSPINESCU

    2013-01-01

    Full Text Available Information and communication technologies are designed to support and anticipate the continuing changes of the information society, while outlining new economic, social and cultural dimensions. We see the growth of new business models whose aim is to remove traditional barriers and improve the value of goods and services. Information is a strategic resource and its manipulation raises new problems for all entities involved in the process. Information and communication technologies should be a stable support in managing the flow of data and support the integrity, confidentiality and availability. Concepts such as eBusiness, eCommerce, Software as a Service, Cloud Computing and Social Media are based on web technologies consisting of complex languages, protocols and standards, built around client-server architecture. One of the most used technologies in mobile applications are the Web Services defined as an application model supported by any operating system able to provide certain functionalities using Internet technologies to promote interoperability between various appli-cations and platforms. Web services use HTTP, XML, SSL, SMTP and SOAP, because their stability has proven over the years. Their functionalities are highly variable, with Web services applications exchange type, weather, arithmetic or authentication services. In this article we will talk about SOAP and REST architectures for web services in mobile applications and we will also provide some practical examples based on Android platform.

  11. BPEL based asynchronous interaction and composition of RESTful Web service%基于BPEL的RESTful Web服务异步交互及组合研究

    Institute of Scientific and Technical Information of China (English)

    铁威; 黄志球; 王进

    2013-01-01

    RESTful Web service has become a primary method to publish services in cloud computing, due to its lightweight and specific semantics. However, because RESTful Web service only support synchronous interaction, it is difficult of using synchronous composition to meet the requirement of the complex business process. Therefore, the paper proposed a callback based asynchronous interaction approach under REST style. The approach enables the composition of both synchronous and asynchronous RESTful Web services by extending the BPEL meta model. The architecture of the execution engine for the extended BPEL was designed and implemented as well.%RESTful Web服务由于其轻量级和明确语义等特性,已成为云计算环境下发布服务的首要方法.但是,由于RESTful Web服务仅支持同步的交互方式,面对复杂业务逻辑时,难以通过服务组合的方式来满足业务需求.针对这些问题,提出了一种基于回调的RESTful Web服务异步交互方式,通过扩展BPEL元模型,增加了BPEL对异步RESTful Web服务组合的支持,并设计实现了扩展后的BPEL执行引擎.

  12. Efficient Web Services Policy Combination

    Science.gov (United States)

    Vatan, Farrokh; Harman, Joseph G.

    2010-01-01

    Large-scale Web security systems usually involve cooperation between domains with non-identical policies. The network management and Web communication software used by the different organizations presents a stumbling block. Many of the tools used by the various divisions do not have the ability to communicate network management data with each other. At best, this means that manual human intervention into the communication protocols used at various network routers and endpoints is required. Developing practical, sound, and automated ways to compose policies to bridge these differences is a long-standing problem. One of the key subtleties is the need to deal with inconsistencies and defaults where one organization proposes a rule on a particular feature, and another has a different rule or expresses no rule. A general approach is to assign priorities to rules and observe the rules with the highest priorities when there are conflicts. The present methods have inherent inefficiency, which heavily restrict their practical applications. A new, efficient algorithm combines policies utilized for Web services. The method is based on an algorithm that allows an automatic and scalable composition of security policies between multiple organizations. It is based on defeasible policy composition, a promising approach for finding conflicts and resolving priorities between rules. In the general case, policy negotiation is an intractable problem. A promising method, suggested in the literature, is when policies are represented in defeasible logic, and composition is based on rules for non-monotonic inference. In this system, policy writers construct metapolicies describing both the policy that they wish to enforce and annotations describing their composition preferences. These annotations can indicate whether certain policy assertions are required by the policy writer or, if not, under what circumstances the policy writer is willing to compromise and allow other assertions to take

  13. 基于Verics的组合Web服务有界模型检测%Bounded Model Checking Web Services Composition via Verics

    Institute of Scientific and Technical Information of China (English)

    骆翔宇; 轩爱成; 沙宗鲁

    2011-01-01

    传统的模型检测技术无法描述系统的认知逻辑特性,而在分布式系统领域,系统和协议的规范适合用多智能体时态认知逻辑来描述.组合Web服务是典型的分布式系统.为了保证组合Web服务运行的正确性,把组合Web服务看成多智能体系统,将其建模成一组相互通信的时间自动机.采用时态认知逻辑模型检测工具Verics对该组合Web服务的可用性、可靠性和时效性的时态认知逻辑特性进行检测.本文以旅游预订系统组合Web服务为例,阐述了上述过程.%The traditional model checking techniques can not describe the epistemic logic for systems. However, for distributed systems , the multi-agent temporal epistemic logics are suitable to express the desired properties of systems and protocols. The Web services composition is a typical kind of distributed systems. In order to guarantee the correctness of Web services, we first regard a Web services composition as a multi-agent system and translate the system description into a network of timed automata. We then apply Verics, a model checker for timed and multi-agent systems, to the verification of the usability, reliability and time-efficiency of Web services compositions, via temporal epistemic logic. To illustrate the effectiveness of the proposed method, we model a particular case study of a travel reservation system and check the related properties.

  14. Towards a Component Model for Web-based Service Composition%一种基于Web的服务组装构件模型

    Institute of Scientific and Technical Information of China (English)

    赵祺; 黄罡; 刘儇哲; 黄冀渝

    2008-01-01

    The web-based service composition is becoming a popular composition style in Service Oriented Computing. Many existing work proposed encapsulating service business logic and User Interface (UI) into a single web-based service component and assembling these components in web-based environment. However,these component models are yet limited in terms of reusability, especially for component qualification, adap-tation and composite structure support. This paper proposes a component model for web-based service compo-sition. Firstly, we present a well-structured component model that decouples the UI and service business log-ic for better adaptation. Secondly, developers are able to assemble components not only at business logic lev-el but also at UI level. The component model supports on-the-fly composition, which provides a quick and effective feedback way for qualification, and also supports the composition result to be published as a new component for further reuse.%基于web的服务组装正成为一种流行的组装风格.许多已有的工作提出将服务业务逻辑和用户界面封装为一个基于web的服务构件,并在基于web的环境中组装这些构件.这些构件模型在复用,尤其是构件验证、适配以及复合构件的支持方面仍存在许多局限.提出一种新型构件模型以支持基于web的服务组装.首先,该构件模型将用户界面和服务业务逻辑分离以获得更好的适配性;其次,开发人员不仅可以在业务逻辑的层次组装这些构件,还可以在用户界面的层次进行组装.该构件模型支持实时组装以实现及时、有效的验证和适配,同时还支持将组装结果发布为一个新的可复用的服务构件.

  15. Sending and Addressing Messages in Web Services

    OpenAIRE

    Borkowski, Piotr

    2007-01-01

    This thesis provides an overview of Web Services technology. The concept of Web Services and Service Oriented Architecture are explained. The thesis focuses on the mechanisms for transporting and addressing messages in web services, especially SOAP. It presents the development history of SOAP, an overview of the SOAP 1.2 specification, and the differences between SOAP in version 1.1 and 1.2. Further, the thesis presents two web servers for development and deployment of web services using Java...

  16. Benchmarking Performance of Web Service Operations

    OpenAIRE

    Zhang, Shuai

    2011-01-01

    Web services are often used for retrieving data from servers providing information of different kinds. A data providing web service operation returns collections of objects for a given set of arguments without any side effects. In this project a web service benchmark (WSBENCH) is developed to simulate the performance of web service calls. Web service operations are specified as SQL statements. The function generator of WSBENCH converts user specified SQL queries into functions and automatical...

  17. The Solution of Heterogeneous Data in Web Service Composition%Web服务组合中异构数据的解决方案

    Institute of Scientific and Technical Information of China (English)

    郭颂; 朱叶

    2012-01-01

    从定义的接口功能上看,用于Web服务组合的Web服务之间的异构主要表现为数据定义抽象层次的异构、数据实体定义的异构及数据定义领域的异构.针对Web服务组合中存在的这些问题,提出了基于语义本体的异构数据转换模型,详细阐述了实现异构数据转换的关键技术,给出了基于语义本体的异构数据转换的实现过程.%Data heterogeneity between web services for compositing web service mainly has the heterogeneity of the abstraction level heterogeneity of data definition,data definition entity and data definition domain. In order to solve those problems existing in web service composition,a new data transformation model of the heterogeneous data was presented. The key technologies were described and the realization course of the heterogeneous data transformation based on the semantic ontology was given.

  18. Isolation by distance, web service

    OpenAIRE

    Bohonak Andrew J; Jensen Jeffrey L; Kelley Scott T

    2005-01-01

    Abstract Background The population genetic pattern known as "isolation by distance" results from spatially limited gene flow and is a commonly observed phenomenon in natural populations. However, few software programs exist for estimating the degree of isolation by distance among populations, and they tend not to be user-friendly. Results We have created Isolation by Distance Web Service (IBDWS) a user-friendly web interface for determining patterns of isolation by distance. Using this site, ...

  19. Deriving algebraic specification of composite web service from BPMN model%从BPMN模型导出组合服务的代数规约

    Institute of Scientific and Technical Information of China (English)

    余波

    2013-01-01

    Aiming at the problem of deriving specifications from composite Web service defined by BPEL when testing the service automatically based on specification, an approach is presented for the sake of deriving algebraic specification defined by algebraic specification language CASOCC-WS of composite Web service defined by BPEL from BPMN model. Firstly, the rules for translating BPMN model into signature and translating BPMN structure into regular expressions are presented. Secondly, the algorithm for deriving the terms of axiom equation from the regular expression is proposed, and the heuristic rules for constructing axioms from the terms manually are proposed. At last, a prototype tool is implemented for deriving signature of composite web service from BPMN model. A case study shows that the presented approach is suitable to writing algebraic specification from the definition of BPEL service.%针对应用规约自动测试BPEL表示组合服务时需要解决BPEL服务的规约生成问题,提出了一种从BPMN模型导出BPEL规范定义的组合Web服务的由代数规约语言CASOCC-WS表示的代数规约方法.首先,定义从BPMN模型转换成基调的规则和从BPMN结构转换成正则表达式的规则,设计由正则表达式导出构成公理的项的算法;然后,提出根据所得的项人工书写公理的启发式规则;最后,实现一个从BPMN模型导出组合服务基调的工具原型.案例研究表明,该方法可以解决BPEL服务的代数规约生成问题.

  20. DTDWS-DESIGN OF TESTBED FOR DISTRIBUTED WEB SERVICE ENVIRONMENT

    Directory of Open Access Journals (Sweden)

    D.CHANDRAMOHAN,

    2011-03-01

    Full Text Available Designing and developing a testbed to evaluate the features of web service properties and their service interfaces in a distributed web service environment. This testbed interface helps the clients and their tools to build automatically with the corresponding web services and to identify its related issues in which it can communicate and cooperate among services in a distributed environment. By establishing set of policy and preferences for relevant supporting tools to evaluate the semantic technology of service and enhancing the tuning features by avoiding interoperability among web services. A light weighted application having unique and specific structure for designing testbed for istributed web service environment (DTDWS with a build in concepts encoded with XML (Extensible Mark-up Language. This proposal breed a trustful zone in a distributed environment by an automated simulation,composition and testing techniques are put into service. Many service conflicts are resolved in a timely and consistent approach all the way through our proposed testbed .

  1. MedlinePlus Connect: Web Service

    Science.gov (United States)

    ... MedlinePlus Connect → Web Service URL of this page: https://medlineplus.gov/connect/service.html MedlinePlus Connect: Web ... the base URL for the Web service is: https://apps.nlm.nih.gov/medlineplus/services/mpconnect_service. ...

  2. Web service composition method based on approximate skyline algorithm%基于近似的skyline算法的Web服务组合方法

    Institute of Scientific and Technical Information of China (English)

    段静珊; 周彦晖

    2014-01-01

    The vigorous development of cloud computing brings new opportunities and challenges to the development of the combination of Web services. Traditional service composition methods focus on achieving value-added service to meet the gro-wing demand of the users, but there are a lot of the same functionality of the specific non-functional type of services on the In-ternet. How to select the combination of Web services from these services in accordance with user preferences, especially the services that meet the specific needs of the user, becomes a problem to be solved. The article uses the AHP algorithm to quantify user preferences. Then we integrate the relative user preferences weight into the approximate skyline query algorithms to pick out the right combination of Web services in order to meet the user’s need. Validity and extendibility of the method are verified through a series of experiments.%云计算的蓬勃发展,为 Web 组合服务的发展带来了新的机遇和挑战,传统的服务组合方法中只注重实现服务增值以满足用户日益增长的需求,而互联网上存在着大量的功能性相同、非功能性不同的具体服务。在这些服务中挑选出符合用户偏好的 Web 组合服务,尤其是符合用户特定需求的 Web 组合服务成为一个亟待解决的问题。文章采用 AHP 算法量化用户偏好,再将得到的用户相对偏好权重融入到近似的skyline查询算法中,挑选出合适的Web组合服务,来满足用户的需求。最后通过一系列实验验证所提出方法的有效性和可扩展性。

  3. A Runtime System for Interactive Web Services

    DEFF Research Database (Denmark)

    Brabrand, Claus; Møller, Anders; Sandholm, Anders

    1999-01-01

    Interactive web services are increasingly replacing traditional static web pages. Producing web services seems to require a tremendous amount of laborious low-level coding due to the primitive nature of CGI programming. We present ideas for an improved runtime system for interactive web services...

  4. ERNE Web Service API

    Data.gov (United States)

    National Aeronautics and Space Administration — The Early Detection Research Network (EDRN) runs a distributed service known as the EDRN Resource Network Exchange (ERNE). ERNE is a virtual specimen bank. It...

  5. Web service composition: a semantic web and automated planning technique application Composición de servicios: una aplicación de la web semántica y las técnicas de planificación automática

    Directory of Open Access Journals (Sweden)

    Guzmán Luna Jaime Alberto

    2008-12-01

    Full Text Available This article proposes applying semantic web and artificial intelligence planning techniques to a web services composition model dealing with problems of ambiguity in web service description and handling incomplete web information. The model uses an OWL-S services and implements a planning technique which handles open world semantics in its reasoning process to resolve these problems. This resulted in a web services composition system incorporating a module for interpreting OWL-S services and converting them into a planning problem in PDDL (a planning module handling incomplete information and an execution service module concurrently interacting with the planner for executing each composition plan service.Este artículo propone la aplicación de técnicas de la web semántica y de planificación de la inteligencia artificial en un modelo de composición de servicios web que enfrenta los problemas de la ambigüedad en la descripción de los servicios y el manejo de la información incompleta en el contexto de la web. Para tratar los problemas mencionados el modelo permite el uso de servi-cios OWL-S e implementa una técnica de planificación que maneja una semántica del mundo abierto en su proceso de razona-miento. Como resultado de este trabajo, se obtuvo un sistema de composición de servicios web que incorpora un módulo que interpreta servicios OWL-S y los convierte a un problema de planificación en PDDL, un módulo de planificación que maneja el problema del conocimiento incompleto y un módulo de ejecución de servicios que interactúa de manera concurrente con el pla-nificador para ejecutar cada uno de los servicios del plan de composición.

  6. Based on the APH Web Service Composition Rresearch%基于APH的Web组合服务研究

    Institute of Scientific and Technical Information of China (English)

    李珊; 吴陆锋; 冯文龙

    2012-01-01

    This paper uses AHP theory to modeling web service , The definition of QoS four-dimensional at- tribute, using Comprehensive value of the QoS evaluate Web service quality, and according to different users goals need to replace the increase or decrease in the number of attribute index, to identify a group of the most consistent with the needs of users of service, improve customer satisfaction. Finally, through an example calcula- tion, it is proved that the model is effective.%本文利用AHP理论对web服务进行建模,定义QoS的四维属性,利用QoS综合值评价Web服务的质量,并根据不同用户目标需要来替换或增减属性指标,能够找出一组最符合用户需求的服务组合,提高了用户的满意度。最后通过实例计算,证明模型有效。

  7. A Runtime System for Interactive Web Services

    DEFF Research Database (Denmark)

    Brabrand, Claus; Møller, Anders; Sandholm, Anders

    1999-01-01

    Interactive web services are increasingly replacing traditional static web pages. Producing web services seems to require a tremendous amount of laborious low-level coding due to the primitive nature of CGI programming. We present ideas for an improved runtime system for interactive web services ...... built on top of CGI running on virtually every combination of browser and HTTP/CGI server. The runtime system has been implemented and used extensively in , a tool for producing interactive web services....

  8. A Runtime System for Interactive Web Services

    DEFF Research Database (Denmark)

    Brabrand, Claus; Møller, Anders; Sandholm, Anders

    1999-01-01

    Interactive web services are increasingly replacing traditional static web pages. Producing web services seems to require a tremendous amount of laborious low-level coding due to the primitive nature of CGI programming. We present ideas for an improved runtime system for interactive web services...... built on top of CGI running on virtually every combination of browser and HTTP/CGI server. The runtime system has been implemented and used extensively in , a tool for producing interactive web services....

  9. Web Services Composition Modeling and Verification Based on Petri Net%基于Petri网的Web服务组合建模与验证

    Institute of Scientific and Technical Information of China (English)

    丁冲冲; 李婷婷

    2014-01-01

    This paper first puts forward Web services composition modeling method based on Petri net. The formal modeling for Web services composition is also the article research content. Then the paper uses the reachability tree as the analytical tool to analyse and verify the features of services composition model, such as accessibility, activity and boundedness. Finally, the article us-es a specific example to illustrate the application of this method.%该文首先提出了基于Petri网的Web服务组合建模方法,对服务组合进行形式化建模,然后采用可达树作为分析工具,对服务组合模型的可达性,活性,有界性等特性进行验证分析。最后通过一个具体的实例说明此方法的应用。

  10. Past, Present, and Future of Web Service

    Science.gov (United States)

    Kitamura, Yasuhiko

    World Wide Web was born as a means to provide information through the Internet. As a number of e-shopping sites are developed on the Internet, the Web provides not only information but also services with which users can interact to buy products. This paper describes the basic standards used in Web service; XML, SOAP, and WSDL, and how Web services are implemented on the Java-based platform Axis. It also mentions the REST-based Web service which gains more attention recently. Finally it forecasts the future of Web service from a viewpoint of Semantic Web.

  11. Data as a Service: A Seismic Web Service Pipeline

    Science.gov (United States)

    Martinez, E.

    2016-12-01

    Publishing data as a service pipeline provides an improved, dynamic approach over static data archives. A service pipeline is a collection of micro web services that each perform a specific task and expose the results of that task. Structured request/response formats allow micro web services to be chained together into a service pipeline to provide more complex results. The U.S. Geological Survey adopted service pipelines to publish seismic hazard and design data supporting both specific and generalized audiences. The seismic web service pipeline starts at source data and exposes probability and deterministic hazard curves, response spectra, risk-targeted ground motions, and seismic design provision metadata. This pipeline supports public/private organizations and individual engineers/researchers. Publishing data as a service pipeline provides a variety of benefits. Exposing the component services enables advanced users to inspect or use the data at each processing step. Exposing a composite service enables new users quick access to published data with a very low barrier to entry. Advanced users may re-use micro web services by chaining them in new ways or injecting new micros services into the pipeline. This allows the user to test hypothesis and compare their results to published results. Exposing data at each step in the pipeline enables users to review and validate the data and process more quickly and accurately. Making the source code open source, per USGS policy, further enables this transparency. Each micro service may be scaled independent of any other micro service. This ensures data remains available and timely in a cost-effective manner regardless of load. Additionally, if a new or more efficient approach to processing the data is discovered, this new approach may replace the old approach at any time, keeping the pipeline running while not affecting other micro services.

  12. QoS-Aware Composite Services Retrieval

    Institute of Scientific and Technical Information of China (English)

    Xiao-Ling Wang; Sheng Huang; Ao-Ying Zhou

    2006-01-01

    For current service-oriented applications, individual web service usually cannot meet the requirements arising from real world applications, so it is necessary to combine the functionalities of different web services to obtain a composite service in response to users' service requests. In order to address the problem of web service composition, this paper proposes an efficient approach to composing basic services in case no any individual service can fully satisfy users' requests. Compared with the general strategies adopted in most previously proposed approaches where only the best composition solution is produced, the QoS-aware service composition approach is given and top k solutions in the framework are provided, rather than focusing on obtaining the best composition solution, since the presented approach allows more candidates that are likely to meet the requirements of the users. The approach is based on a succinct binary tree data structure, and a system,named ATC (Approach to Top-k Composite services retrieval) system is implemented. In ATC, QoS is taken into account for composite service, and a heuristic-based search method is proposed to retrieve top k composite service. Some extensive experiments are designed and two web service benchmarks are used for performance study. The experimental results show that the proposed approach can assure high precision and efficiency for composite service search.

  13. Enriching the Web Processing Service

    Science.gov (United States)

    Wosniok, Christoph; Bensmann, Felix; Wössner, Roman; Kohlus, Jörn; Roosmann, Rainer; Heidmann, Carsten; Lehfeldt, Rainer

    2014-05-01

    The OGC Web Processing Service (WPS) provides a standard for implementing geospatial processes in service-oriented networks. In its current version 1.0.0 it allocates the operations GetCapabilities, DescribeProcess and Execute, which can be used to offer custom processes based on single or multiple sub-processes. A large range of ready to use fine granular, fundamental geospatial processes have been developed by the GIS-community in the past. However, modern use cases or whole workflow processes demand specifications of lifecycle management and service orchestration. Orchestrating smaller sub-processes is a task towards interoperability; a comprehensive documentation by using appropriate metadata is also required. Though different approaches were tested in the past, developing complex WPS applications still requires programming skills, knowledge about software libraries in use and a lot of effort for integration. Our toolset RichWPS aims at providing a better overall experience by setting up two major components. The RichWPS ModelBuilder enables the graphics-aided design of workflow processes based on existing local and distributed processes and geospatial services. Once tested by the RichWPS Server, a composition can be deployed for production use on the RichWPS Server. The ModelBuilder obtains necessary processes and services from a directory service, the RichWPS semantic proxy. It manages the lifecycle and is able to visualize results and debugging-information. One aim will be to generate reproducible results; the workflow should be documented by metadata that can be integrated in Spatial Data Infrastructures. The RichWPS Server provides a set of interfaces to the ModelBuilder for, among others, testing composed workflow sequences, estimating their performance and to publish them as common processes. Therefore the server is oriented towards the upcoming WPS 2.0 standard and its ability to transactionally deploy and undeploy processes making use of a WPS

  14. DESIGNING DEPENDABLE AGILE LAYERED WEB SERVICES SECURITY ARCHITECTURE SOLUTIONS

    Directory of Open Access Journals (Sweden)

    M.UPENDRA KUMAR

    2011-06-01

    Full Text Available Service Orientation Engineering (SOE (using Web Services and Agile modeling software development presents promising solutions for contemporary software development projects to deal effectively withchallenges in increasingly turbulent business environments typified by unpredictable markets, changing customer requirements, pressures of even shorter time to deliver, and rapidly advancing informationtechnologies. Web Services Security Architectures have three layers, as provided by NIST standard: Web Service Layer, Web Services Framework Layer (.NET or J2EE, and Web Server Layer. In services oriented web services architecture, business processes are executed as a composition of services, which can suffer from vulnerabilities pertaining to secure data access and protecting code of Web Services. The goal of the Web services security architecture is to summary out the details of message-level security from the mainstream business logic, with a focus on Web Service contract design and versioning for SOA. Service oriented web services architectures impose additional analysis complexity as they provide much flexibility and frequentchanges with in orchestrated processes and services. In this paper, we discuss about developing dependable solutions for Web Services Security Architectures using Agile Layered security architectures in terms of Privacy requirements. All this research is motivated by Secure Service Oriented Analysis and Design research domain. We initially validate this by a BPEL Editor using GWT for RBAC and Privacy. Finally a real world case study is implemented using J2EE, for validating our approach. Secure Stock Exchange System using Web Services is to automate the stock exchange works, and can help user make the decisions when it comes to investment.

  15. Semantic Search of Web Services

    Science.gov (United States)

    Hao, Ke

    2013-01-01

    This dissertation addresses semantic search of Web services using natural language processing. We first survey various existing approaches, focusing on the fact that the expensive costs of current semantic annotation frameworks result in limited use of semantic search for large scale applications. We then propose a vector space model based service…

  16. Semantic Search of Web Services

    Science.gov (United States)

    Hao, Ke

    2013-01-01

    This dissertation addresses semantic search of Web services using natural language processing. We first survey various existing approaches, focusing on the fact that the expensive costs of current semantic annotation frameworks result in limited use of semantic search for large scale applications. We then propose a vector space model based service…

  17. Secure Sessions for Web Services

    NARCIS (Netherlands)

    Bhargavan, K.; Corin, R.J.; Fournet, C.; Gordon, A.D.

    2004-01-01

    WS-Security provides basic means to secure SOAP traffic, one envelope at a time. For typical web services, however, using WS-Security independently for each message is rather inefficient; besides, it is often important to secure the integrity of a whole session, as well as each message. To this end,

  18. Service quality of web information systems

    OpenAIRE

    Tonta, Yaşar; Soydal, İrem

    2010-01-01

    The recent developments in technology made it possible to provide various services through the Web. Users’ tendencies to request services via the Web and their expectations from the services are increasing gradually. In order to design better web sites and have users continue to use them, it is essential to understand what users expect of web services, how they perceive such service dimensions as security, design and quality along with the ones they value most. Using the survey method, this s...

  19. Security Aware Mobile Web Service Provisioning

    CERN Document Server

    Srirama, Satish Narayana; Prinz, Wolfgang; Pendyala, Kiran

    2010-01-01

    Mobile data services in combination with profluent web services are seemingly the path breaking domain in current information research. Effectively, these mobile web services will pave the way for exciting performance and security challenges, the core need-to-be-addressed issues. On security front, though a lot of standardized security specifications and implementations exist for web services in the wired networks, not much has been analysed and standardized in the wireless environments. This paper addresses some of the critical challenges in providing security to the mobile web service domain. We first explore mobile web services and their key security issues, with special focus on provisioning based on a mobile web service provider realized by us. Later we discuss state-of-the-art security awareness in the wired and wireless web services, and finally address the realization of security for the mobile web service provisioning with performance analysis results.

  20. Web Services on Rails

    CERN Document Server

    Marshall, Kevin

    2006-01-01

    This PDF will show you how your small business or enterprise can publish its APIs (application programming interface) to a developer community just like the behemoths of the Internet--Google, Yahoo!, eBay, and Amazon. These giants already offer their APIs to other programmers and allow for add-on services and mash-ups to develop from them--but until recently, the capability for most enterprises to do the same was limited by a myriad of competing standards and a lack of easy-to-use tools to accomplish the task. Ruby on Rails levels the playing field for companies by simplifying the process

  1. On formalizing and verifying web services

    Institute of Scientific and Technical Information of China (English)

    Wei Yinxing; Zhang Shensheng; Zhong Farong

    2005-01-01

    Web services are becoming an important paradigm for web-based computing. However the mainstream web service description language such as WSDL (Web Service Description Language) is lack of formal basis. In order to verify the behavioral properties of web services, we adopt the π-calculus as a precise language because it provides many useful facilities such as behavioral equivalence, mobility that are lack in other formal language. The basic elements of WSDL are translated into the terms in the π-calculus. By means of the MWB (Mobility Workbench), a concurrency tool, the behavioral property of web services denoted by processes is verified.

  2. Securing Web Services using Service Token Security

    Directory of Open Access Journals (Sweden)

    Stelian Dumitra

    2014-06-01

    Full Text Available Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 Web services are distributed components that enable interaction of software componentsacross organizational boundaries. The main advantages of web services are related to the flexibility and versatility: they support a variety of architectures and are independent of platforms and models. Also, they can expose valuable data, applications and systems of organizations to a variety of external threats. Securing web services is one of the most important topics related to them. This paper describes the core web services specifications, the top threats facing web services and the security fundamentals. At the end of the paper is presented a custom authentication and authorization model (brokered authentication to ensure a robust protection, a model that shows how to authenticate and authorize callers to perform operations and how to access resources. This model uses the following frameworks/standards: Windows Identity Foundation (WIF to apply the principles of claims-based identity, Windows Communication Foundation (WCF, to develop services/client services and integrate with WIF, and Service Token Security (STS, to issue security tokens.The conclusions and the future proposed developments are presented in the end of the paper. /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso

  3. Modeling and verifying Web services driven by requirements: An ontology-based approach

    Institute of Scientific and Technical Information of China (English)

    HOU Lishan; JIN ZHi; WU Budan

    2006-01-01

    Automatic discovery and composition of Web services is an important research area in Web service technology, in which the specification of Web services is a key issue. This paper presents a Web service capability description framework based on the environment ontology. This framework depicts Web services capability in two aspects:the operable environment and the environment changes resulting from behaviors of the Web service. On the basis of the framework, a requirement-driven Web service composition model has been constructed. This paper brings forward the formalization of Web service interactions with π calculus. And an automatic mechanism converting conceptual capability description to the formal process expression has been built. This kind of formal specification assists in verifying whether the composite Web service model matches the requirement.

  4. Detecting feature interactions in Web services with model checking techniques

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    As a platform-independent software system, a Web service is designed to offer interoperability among diverse and heterogeneous applications.With the introduction of service composition in the Web service creation, various message interactions among the atomic services result in a problem resembling the feature interaction problem in the telecommunication area.This article defines the problem as feature interaction in Web services and proposes a model checking-based detection method.In the method, the Web service description is translated to the Promela language - the input language of the model checker simple promela interpreter (SPIN), and the specific properties, expressed as linear temporal logic (LTL) formulas, are formulated according to our classification of feature interaction.Then, SPIN is used to check these specific properties to detect the feature interaction in Web services.

  5. Earth Science Mining Web Services

    Science.gov (United States)

    Pham, Long; Lynnes, Christopher; Hegde, Mahabaleshwa; Graves, Sara; Ramachandran, Rahul; Maskey, Manil; Keiser, Ken

    2008-01-01

    To allow scientists further capabilities in the area of data mining and web services, the Goddard Earth Sciences Data and Information Services Center (GES DISC) and researchers at the University of Alabama in Huntsville (UAH) have developed a system to mine data at the source without the need of network transfers. The system has been constructed by linking together several pre-existing technologies: the Simple Scalable Script-based Science Processor for Measurements (S4PM), a processing engine at he GES DISC; the Algorithm Development and Mining (ADaM) system, a data mining toolkit from UAH that can be configured in a variety of ways to create customized mining processes; ActiveBPEL, a workflow execution engine based on BPEL (Business Process Execution Language); XBaya, a graphical workflow composer; and the EOS Clearinghouse (ECHO). XBaya is used to construct an analysis workflow at UAH using ADam components, which are also installed remotely at the GES DISC, wrapped as Web Services. The S4PM processing engine searches ECHO for data using space-time criteria, staging them to cache, allowing the ActiveBPEL engine to remotely orchestras the processing workflow within S4PM. As mining is completed, the output is placed in an FTP holding area for the end user. The goals are to give users control over the data they want to process, while mining data at the data source using the server's resources rather than transferring the full volume over the internet. These diverse technologies have been infused into a functioning, distributed system with only minor changes to the underlying technologies. The key to the infusion is the loosely coupled, Web-Services based architecture: All of the participating components are accessible (one way or another) through (Simple Object Access Protocol) SOAP-based Web Services.

  6. Earth Science Mining Web Services

    Science.gov (United States)

    Pham, L. B.; Lynnes, C. S.; Hegde, M.; Graves, S.; Ramachandran, R.; Maskey, M.; Keiser, K.

    2008-12-01

    To allow scientists further capabilities in the area of data mining and web services, the Goddard Earth Sciences Data and Information Services Center (GES DISC) and researchers at the University of Alabama in Huntsville (UAH) have developed a system to mine data at the source without the need of network transfers. The system has been constructed by linking together several pre-existing technologies: the Simple Scalable Script-based Science Processor for Measurements (S4PM), a processing engine at the GES DISC; the Algorithm Development and Mining (ADaM) system, a data mining toolkit from UAH that can be configured in a variety of ways to create customized mining processes; ActiveBPEL, a workflow execution engine based on BPEL (Business Process Execution Language); XBaya, a graphical workflow composer; and the EOS Clearinghouse (ECHO). XBaya is used to construct an analysis workflow at UAH using ADaM components, which are also installed remotely at the GES DISC, wrapped as Web Services. The S4PM processing engine searches ECHO for data using space-time criteria, staging them to cache, allowing the ActiveBPEL engine to remotely orchestrates the processing workflow within S4PM. As mining is completed, the output is placed in an FTP holding area for the end user. The goals are to give users control over the data they want to process, while mining data at the data source using the server's resources rather than transferring the full volume over the internet. These diverse technologies have been infused into a functioning, distributed system with only minor changes to the underlying technologies. The key to this infusion is the loosely coupled, Web- Services based architecture: All of the participating components are accessible (one way or another) through (Simple Object Access Protocol) SOAP-based Web Services.

  7. 基于OPN的环境约束下Web服务组合正确性分析%Research of correctness of web service composition under environment constraint based on open Petri net

    Institute of Scientific and Technical Information of China (English)

    高新; 方贤文; 许志才

    2012-01-01

    To realize the correctness of the web service composition under the environment constraint, the first concept of web environ ment domain and web service domain, and modeling based on open petri net (OPN) is presented. And interactive behavior between the web environmental model and the web service composition model is analyzed. Then, the composition's precondition and the determination algorithm of composition correctness are proposed, in order to realize the correctness analyzing of the web service composition under the environment constraint. Finally, the method's validity is analyzed through the concrete example.%为了研究环境约束下Web服务组合的正确性,提出Web服务域和Web环境域的概念,并使用开放Petri网对Web服务域和Web环境域进行建模.通过分析Web环境域模型与Web服务域模型组合后的交互行为情况,给出了二者可组合的前提条件以及组合后的正确性判定算法,从而实现在环境约束下Web服务组合的正确性分析和判定.最后通过具体实例结果表明了该方法的有效性.

  8. Geoinformation systems and web services

    Directory of Open Access Journals (Sweden)

    Jan Růžička

    2005-06-01

    Full Text Available State-of-art systems provide comprehensive solutions almost to all users from the data pre-processing through data processing to their final presentation. Consequently, these solutions are very expensive and unavailable for some potential end users. Thus, several questions come up. Do we really need all these functions and, if not why do we have to pay for them? Is it possible to develop such a system with all these functions but without the need of end users to pay extra money for that? In the following text the authors will try to answer the above questions. Web services are a hit of the day. On many experts opinions web services represent a standard for a new information system generation. A prove of this statement could be the fact that every new software product support this form of the internet use. Also in the geoinformatics, this facility is successfully used for a long time (e.g. WMS, WFS. But as all, even web services are further developed and also native protocols, based on the XML format, are subsequently replaced by general protocols (e.g. SOAP.These protocols also use XML, but they enable the development of distributed systems with paralleled features using the Internet as a communication middleware. Thus, it is possible to develop wide information systems with a high level of modularity and integration with existing systems. The paper describes the architecture for the development of open and modular systems.

  9. Assessment of OGC Web Processing Services for REST principles

    CERN Document Server

    Granell, Carlos; Tamayo, Alain; Huerta, Joaquín

    2012-01-01

    Recent distributed computing trends advocate the use of Representational State Transfer (REST), which aligns to the same principles than shape the Web, to alleviate the inherent complexity of the Web services standards in building service-oriented web applications. In this paper, we focus on the particular case of geospatial services interfaced by the OGC Web Processing Service (WPS) specification, geoprocessing services on top of service oriented architectures, in order to assess whether WPS-based geoprocessing services can be viewed from the architectural principles exposed in REST. Our concluding remarks suggest that the adoption of REST principles, to specially harness the built-in mechanisms of the HTTP application protocol, may be beneficial in scenarios where ad hoc composition of geoprocessing services are required, common for most non-expert users of geospatial information infrastructures.

  10. 利用语义服务构件和组合模式支持web服务重用%Supporting web services reuse by semantic service component and composition pattern

    Institute of Scientific and Technical Information of China (English)

    楚旺; 钱德沛

    2006-01-01

    由于目前的web服务描述方法不能有效地解决不同粒度的服务重用问题,引入"语义服务构件"的概念封装多个服务以及它们的协调规则(choreography),为不同抽象层次的服务提供统一的描述框架.为了提高服务的可重用性,提出了"组合模式"的思想描述构件之间的关系,并定义了构件关系的语义.组合模式可以有效地支持不同粒度的服务重用和设计阶段的测试.开发经验表明:由于比较容易地进行构件的理解、选择和重用,组合模式能够有效地支持应用组装.%Due to the fact that the existing web service description methods cannot address the issue of service reuse of various levels of granularity,the concept of service component is introduced,which packages together web services and choreography, and their operations and properties are presented in a consistent and uniform manner.Service components are published externally as normal web services and can thus be employed by web-based applications.In order to improve reusability and testability of service components,the concept of composition pattern is also proposed,which presents the relationships among service components.The relationships and relationship compositions have a rigorous semantic,so that composite components can be validated at the configuration stage.The composition patterns support to integrate service components of various levels of granularity.Experience indicates that the application assembly can effectively be conducted by understanding,selecting,and reusing components easily.

  11. Similarity Based Semantic Web Service Match

    Science.gov (United States)

    Peng, Hui; Niu, Wenjia; Huang, Ronghuai

    Semantic web service discovery aims at returning the most matching advertised services to the service requester by comparing the semantic of the request service with an advertised service. The semantic of a web service are described in terms of inputs, outputs, preconditions and results in Ontology Web Language for Service (OWL-S) which formalized by W3C. In this paper we proposed an algorithm to calculate the semantic similarity of two services by weighted averaging their inputs and outputs similarities. Case study and applications show the effectiveness of our algorithm in service match.

  12. Web-based Altimeter Service

    Science.gov (United States)

    Callahan, P. S.; Wilson, B. D.; Xing, Z.; Raskin, R. G.

    2010-12-01

    We have developed a web-based system to allow updating and subsetting of TOPEX data. The Altimeter Service will be operated by PODAAC along with their other provision of oceanographic data. The Service could be easily expanded to other mission data. An Altimeter Service is crucial to the improvement and expanded use of altimeter data. A service is necessary for altimetry because the result of most interest - sea surface height anomaly (SSHA) - is composed of several components that are updated individually and irregularly by specialized experts. This makes it difficult for projects to provide the most up-to-date products. Some components are the subject of ongoing research, so the ability for investigators to make products for comparison or sharing is important. The service will allow investigators/producers to get their component models or processing into widespread use much more quickly. For coastal altimetry, the ability to subset the data to the area of interest and insert specialized models (e.g., tides) or data processing results is crucial. A key part of the Altimeter Service is having data producers provide updated or local models and data. In order for this to succeed, producers need to register their products with the Altimeter Service and to provide the product in a form consistent with the service update methods. We will describe the capabilities of the web service and the methods for providing new components. Currently the Service is providing TOPEX GDRs with Retracking (RGDRs) in netCDF format that has been coordinated with Jason data. Users can add new orbits, tide models, gridded geophysical fields such as mean sea surface, and along-track corrections as they become available and are installed by PODAAC. The updated fields are inserted into the netCDF files while the previous values are retained for comparison. The Service will also generate SSH and SSHA. In addition, the Service showcases a feature that plots any variable from files in netCDF. The

  13. Correct software in web applications and web services

    CERN Document Server

    Thalheim, Bernhard; Prinz, Andreas; Buchberger, Bruno

    2015-01-01

    The papers in this volume aim at obtaining a common understanding of the challenging research questions in web applications comprising web information systems, web services, and web interoperability; obtaining a common understanding of verification needs in web applications; achieving a common understanding of the available rigorous approaches to system development, and the cases in which they have succeeded; identifying how rigorous software engineering methods can be exploited to develop suitable web applications; and at developing a European-scale research agenda combining theory, methods a

  14. The Organizational Role of Web Services

    Science.gov (United States)

    Mitchell, Erik

    2011-01-01

    The workload of Web librarians is already split between Web-related and other library tasks. But today's technological environment has created new implications for existing services and new demands for staff time. It is time to reconsider how libraries can best allocate resources to provide effective Web services. Delivering high-quality services…

  15. Ontology Based Qos Driven Web Service Discovery

    Directory of Open Access Journals (Sweden)

    R Suganyakala

    2011-07-01

    Full Text Available In today's scenario web services have become a grand vision to implement the business process functionalities. With increase in number of similar web services, one of the essential challenges is to discover relevant web service with regard to user specification. Relevancy of web service discovery can be improved by augmenting semantics through expressive formats like OWL. QoS based service selection will play a significant role in meeting the non-functional user requirements. Hence QoS and semantics has been used as finer search constraints to discover the most relevant service. In this paper, we describe a QoS framework for ontology based web service discovery. The QoS factors taken into consideration are execution time, response time, throughput, scalability, reputation, accessibility and availability. The behavior of each web service at various instances is observed over a period of time and their QoS based performance is analyzed.

  16. 基于流演算的Web服务自动组合方法%An Approach for Automatic Web Services Composition Based on Fluent Calculus

    Institute of Scientific and Technical Information of China (English)

    陈志勇; 李庆忠; 王文明; 崔立真; 丛国进

    2013-01-01

    近年来,基于语义的Web服务组合,尤其是Web服务的自动组合方法已成为服务计算领域的一个研究热点.实现了从一个OWL-S过程模型到流演算概念的映射,并给出了相应的转换算法.在此基础上,提出了一个新颖的、基于流演算形式化体系的Web服务自动组合方法.该方法采用前推推理机制对状态和动作进行推理,有效地克服了以传统的情景演算为代表的人工智能规划算法执行效率较低的问题.设计实现了一个实验性的原型系统,结合一个旅游行程规划的实例说明了本文提出的方法的有效性.对提出的BCABFC(Backward-Chaining Algorithm Based On Fluent Calculus)算法与基于情景演算的同类算法进行性能比较,实验结果表明该算法具有较好的性能.%In recent years, semantics-based Web Services composition, especially automated composition method has become popularity in the research area of Service Computing. This paper has identified a mapping between an OWL-S process ontology and the fluent calculus concepts. We present an algorithm to translate OWL-S service descriptions into an equivalent fluent calculus service specification. This paper presents a novel approach for automatic Web service composition method based on the formalism of fluent calculus. In our approach, the Web service composition process is viewed as an AI planning problem in the fluent calculus formalism. We show how the planning capabilities of the fluent calculus can be used to automatically generate an abstract composition model in terms of user personalized requests. This method applies the principle of progression for reasoning the status and action of the object. As a result, it brings a higher efficiency than traditional AI planning algorithms characterized by Situation Calculus. For testing our composition method, we have designed and implemented an experimental prototype and demonstrate its effectiveness with the help of an application

  17. A model-driven approach for composing SAWSDL semantic Web services

    CERN Document Server

    Belouadha, Fatima-Zahra; Roudies, Ounsa

    2010-01-01

    Composing Web services is a convenient means of dealing with complex requests. However, the number of Web services on the Internet is increasing. This explains the growing interest in composing Web services automatically. Nevertheless, the Web services' semantics is necessary for any dynamic composition process. In this article, we present an MDA approach to develop and compose SAWSDL semantic Web services. To model Web services, we use a UML profile which is independent of the description standards. The SAWSDL interface files are generated by using transformation rules. To model the behavior of a composite Web service and generate its executable BPEL file, we use the BPMN notation in a platform of modeling and implementing business process. The main contribution of this work is the easy and extensible solution to a model-driven development of the semantic atomic and composite Web services.

  18. A model-driven approach for composing SAWSDL semantic Web services

    Directory of Open Access Journals (Sweden)

    Fatima-Zahra Belouadha

    2010-03-01

    Full Text Available Composing Web services is a convenient means of dealing with complex requests. However, the number of Web services on the Internet is increasing. This explains the growing interest in composing Web services automatically. Nevertheless, the Web services' semantics is necessary for any dynamic composition process. In this article, we present an MDA approach to develop and compose SAWSDL semantic Web services. To model Web services, we use a UML profile which is independent of the description standards. The SAWSDL interface files are generated by using transformation rules. To model the behavior of a composite Web service and generate its executable BPEL file, we use the BPMN notation in a platform of modeling and implementing business process. The main contribution of this work is the easy and extensible solution to a model-driven development of the semantic atomic and composite Web services.

  19. MedlinePlus Health Topic Web Service

    Data.gov (United States)

    U.S. Department of Health & Human Services — A search-based Web service that provides access to disease, condition and wellness information via MedlinePlus health topic data in XML format. The service accepts...

  20. Survey on Services Composition Synthesis Model

    Directory of Open Access Journals (Sweden)

    Ibrahima Kalil Toure

    2013-01-01

    Full Text Available Current web services development tools are more sophisticated though ease of use, which leverage the creation of more web services thereof. This is the fact that, web services are being created and updated frequently, this multiplication of web services cannot be easily controlled by human being because it is almost impossible to analyze them and generate the composition plan. Composition of web services is the issue of synthesizing a new composite web service, obtained by combining a set of available (component services, when a client request cannot be satisfied by available web services. To address this issue, three main models have been proposed as a solution. The OWL-S model, the Conversational model and the Roman model which is investigated here. In this paper, we propose a survey on the so-called Roman model and present the framework and all its extension. We also underline its drawback, shortcomings and some advantages, and then try to provide some research direction.

  1. Fairness as a QoS Measure for Web Services

    CERN Document Server

    Bistarelli, Stefano; 10.4204/EPTCS.2.9

    2009-01-01

    Service Oriented Architectures (SOAs) are component-based architectures, characterized by reusability, modularization and composition, usually offered by HTTP (web services) and often equipped with a Quality of Services (QoS) measure. In order to guarantee the fairness property to each client requesting a service, we propose a fair version of the (Soft) Concurrent Constraint language to deal with the negotiation phases of the Service Level Agreement (SLA) protocol.

  2. PERBANDINGAN ANTARA “BIG” WEB SERVICE DENGAN RESTFUL WEB SERVICE UNTUK INTEGRASI DATA BERFORMAT GML

    Directory of Open Access Journals (Sweden)

    Adi Nugroho

    2012-01-01

    Full Text Available Web Service with Java: SOAP (JAX-WS/Java API for XML Web Services and Java RESTful Web Service (JAX-RS/Java RESTful API for XML Web Services are now a technology competing with each other in terms of their use for integrates data residing in different systems. Both Web Service technologies, of course, have advantages and disadvantages. In this paper, we discuss the comparison of the two technologies is a Java Web Service in relation to the development of GIS application (Geographic Information System integrates the use of data-formatted GML (Geography Markup Language, which is stored in the system database XML (eXtensible Markup Language.

  3. Web Service Architecture for e-Learning

    Directory of Open Access Journals (Sweden)

    Xiaohong Qiu

    2005-10-01

    Full Text Available Message-based Web Service architecture provides a unified approach to applications and Web Services that incorporates the flexibility of messaging and distributed components. We propose SMMV and MMMV collaboration as the general architecture of collaboration based on a Web service model, which accommodates both instructor-led learning and participatory learning. This approach derives from our message-based Model-View-Controller (M-MVC architecture of Web applications, comprises an event-driven Publish/Subscribe scheme, and provides effective collaboration with high interactivity of rich Web content for diverse clients over heterogeneous network environments.

  4. A web service infrastructure for thermochemical data.

    Science.gov (United States)

    Paolini, Christopher P; Bhattacharjee, Subrata

    2008-07-01

    W3C standardized Web Services are becoming an increasingly popular middleware technology used to facilitate the open exchange of chemical data. While several projects in existence use Web Services to wrap existing commercial and open-source tools that mine chemical structure data, no Web Service infrastructure has yet been developed to compute thermochemical properties of substances. This work presents an infrastructure of Web Services for thermochemical data retrieval. Several examples are presented to demonstrate how our Web Services can be called from Java, through JavaScript using an AJAX methodology, and within commonly used commercial applications such as Microsoft Excel and MATLAB for use in computational work. We illustrate how a JANAF table, widely used by chemists and engineers, can be quickly reproduced through our Web Service infrastructure.

  5. Discovery and Classification of Bioinformatics Web Services

    Energy Technology Data Exchange (ETDEWEB)

    Rocco, D; Critchlow, T

    2002-09-02

    The transition of the World Wide Web from a paradigm of static Web pages to one of dynamic Web services provides new and exciting opportunities for bioinformatics with respect to data dissemination, transformation, and integration. However, the rapid growth of bioinformatics services, coupled with non-standardized interfaces, diminish the potential that these Web services offer. To face this challenge, we examine the notion of a Web service class that defines the functionality provided by a collection of interfaces. These descriptions are an integral part of a larger framework that can be used to discover, classify, and wrapWeb services automatically. We discuss how this framework can be used in the context of the proliferation of sites offering BLAST sequence alignment services for specialized data sets.

  6. QoS management of web services

    CERN Document Server

    Zheng, Zibin

    2013-01-01

    Quality-of-Service (QoS) is normally used to describe the non-functional characteristics of Web services and as a criterion for evaluating different Web services. QoS Management of Web Services presents an innovative QoS evaluation framework for these services. Moreover, three QoS prediction methods and two methods for creating fault-tolerant Web services are also proposed in this book. It not only provides the latest research findings, but also presents an excellent overview of the QoS management of Web services, making it a valuable resource for researchers and graduate students in service computing.   Zibin Zheng is an associate research fellow at the Shenzhen Research Institute, the Chinese University of Hong Kong, China. Professor Michael R. Lyu also works at the same institute.

  7. Dynamic handling for cooperating scientific web services

    NARCIS (Netherlands)

    Cushing, R.; Koulouzis, S.; Belloum, A.; Bubak, M.

    2011-01-01

    Many e-Science applications are increasingly relying on orchestrating workflows of static web services. The static nature of these web services means that workflow managment systems have no control over the underlying mechanics of such services. This lack of control manifests itself as a problem as

  8. An Adaptive Trust Model of Web Services

    Institute of Scientific and Technical Information of China (English)

    SU Jin-dian; GUO He-qing; GAO Yin

    2005-01-01

    This paper proposes a dynamic Web service trust(WS Trust ) model, and some corresponding trust metric evaluation algorithms. The main goal is to evaluate the trustworthiness and predict the future behaviors of entities in order to help users find trustworthy Web service providers and prevent users from providing unfair ratings against service providers.

  9. Web Service Composition Based on Reinforcement -Learning%基于强化学习的Web服务组合

    Institute of Scientific and Technical Information of China (English)

    汤萍萍; 王红兵

    2008-01-01

    单个Web 服务的能力有限,如何使企业内或企业间的诸多业务服务有机地集成,提供更有价值的服务,是目前基于Web 服务的应用集成的核心问题.Web 服务组合就是将已有服务按照一定的逻辑顺序组织起来构成新的服务,从而实现更强大的功能.这里提出一种基于强化学习的服务组合方法,它在于能够实现动态的Web 服务组合.

  10. Multilabel Learning for Automatic Web Services Tagging

    OpenAIRE

    Mustapha AZNAG; Mohamed QUAFAFOU; Jarir, Zahi

    2014-01-01

    Recently, some web services portals and search engines as Biocatalogue and Seekda!, have allowed users to manually annotate Web services using tags. User Tags provide meaningful descriptions of services and allow users to index and organize their contents. Tagging technique is widely used to annotate objects in Web 2.0 applications. In this paper we propose a novel probabilistic topic model (which extends the CorrLDA model - Correspondence Latent Dirichlet Allocation-) to automatically tag we...

  11. Domain Specific Languages for Interactive Web Services

    DEFF Research Database (Denmark)

    Brabrand, Claus

    This dissertation shows how domain specific languages may be applied to the domain of interactive Web services to obtain flexible, safe, and efficient solutions. We show how each of four key aspects of interactive Web services involving sessions, dynamic creation of HTML/XML documents, form field......, , that supports virtually all aspects of the development of interactive Web services and provides flexible, safe, and efficient solutions....

  12. Indexer Based Dynamic Web Services Discovery

    CERN Document Server

    Bashir, Saba; Javed, M Younus; Khan, Aihab; Khiyal, Malik Sikandar Hayat

    2010-01-01

    Recent advancement in web services plays an important role in business to business and business to consumer interaction. Discovery mechanism is not only used to find a suitable service but also provides collaboration between service providers and consumers by using standard protocols. A static web service discovery mechanism is not only time consuming but requires continuous human interaction. This paper proposed an efficient dynamic web services discovery mechanism that can locate relevant and updated web services from service registries and repositories with timestamp based on indexing value and categorization for faster and efficient discovery of service. The proposed prototype focuses on quality of service issues and introduces concept of local cache, categorization of services, indexing mechanism, CSP (Constraint Satisfaction Problem) solver, aging and usage of translator. Performance of proposed framework is evaluated by implementing the algorithm and correctness of our method is shown. The results of p...

  13. A Web Service Framework for Economic Applications

    Directory of Open Access Journals (Sweden)

    Dan BENTA

    2010-01-01

    Full Text Available The Internet offers multiple solutions to linkcompanies with their partners, customers or suppliersusing IT solutions, including a special focus on Webservices. Web services are able to solve the problem relatedto the exchange of data between business partners, marketsthat can use each other's services, problems ofincompatibility between IT applications. As web servicesare described, discovered and accessed programs based onXML vocabularies and Web protocols, Web servicesrepresents solutions for Web-based technologies for smalland medium-sized enterprises (SMEs. This paper presentsa web service framework for economic applications. Also, aprototype of this IT solution using web services waspresented and implemented in a few companies from IT,commerce and consulting fields measuring the impact ofthe solution in the business environment development.

  14. Dynamic Delegation of Authority in Web Services

    OpenAIRE

    Chadwick, David W.

    2007-01-01

    Delegation of authority (DOA) is an essential procedure in every modern business. This chapter enumerates the requirements for a delegation of authority Web service that allows users and services to delegate to other users and services authority to access computer- based resources. The various models and architecture that can support a DOA Web service are described. A key component of the DOA service is the organisations delegation policy, which provides the rules for who is allowed to delega...

  15. Realizing Mobile Web Services for Dynamic Applications

    Science.gov (United States)

    Zaplata, Sonja; Dreiling, Viktor; Lamersdorf, Winfried

    Use of web services also on mobile devices becomes increasingly relevant. However, realizing such mobile web services based on the standard protocol stack is often inappropriate for resource-restricted mobile devices in dynamic networks. On the other hand, using specialized alternative protocols restricts compatibility with traditional service applications. Thus, existing approaches often do not allow to integrate heterogeneous service instances dynamically, as it is, e.g., required for executing mobile service-based business processes.

  16. Analysis of Web Service Substitution%Web服务的替换分析

    Institute of Scientific and Technical Information of China (English)

    党敏侠

    2012-01-01

    Web服务合成是Web服务研究领域的热点问题,Web服务的替换与Web服务合成密切相关。Web服务的替换对于Web服务合成系统的健壮性是非常重要的。文章使用进程代数作为形式化的分析工具描述Web服务,为Web服务建模,并提出为保证替换后服务合成仍然是正确的所要满足的约束条件。%Web services composition is a key issue in web service architecture and web service research area.In this paper,we present a design method for web service composition.Upon our design method,we study substitution of web service which is important for robustness of web service composition.We use process algebra as formalism foundation modeling and specifying web services and reasoning on behavioral features of web services composition.As to the problem of how to substitute a component web service,once specifications of component web services are given,any new selected web services can substitute old component service and take part in composition successfully in the case that they satisfy criteria we propose.

  17. Using Web Services for Open Service and Integration

    Directory of Open Access Journals (Sweden)

    Shien-Chiang Yu

    2003-06-01

    Full Text Available A Web Service is a distributed application component based on the interchanging XML-encoded messages. Through standard protocols and methods, it provides distributed transaction in simplification and standardization. This Web Service can be used in the integrated information system as well as the service requirements of Open Digital Library. The purpose of this article is to tackle the problems of web services architecture, its associated standards, and issues of application.[Article content in Chinese

  18. Multilabel Learning for Automatic Web Services Tagging

    Directory of Open Access Journals (Sweden)

    Mustapha AZNAG

    2014-08-01

    Full Text Available Recently, some web services portals and search engines as Biocatalogue and Seekda!, have allowed users to manually annotate Web services using tags. User Tags provide meaningful descriptions of services and allow users to index and organize their contents. Tagging technique is widely used to annotate objects in Web 2.0 applications. In this paper we propose a novel probabilistic topic model (which extends the CorrLDA model - Correspondence Latent Dirichlet Allocation- to automatically tag web services according to existing manual tags. Our probabilistic topic model is a latent variable model that exploits local correlation labels. Indeed, exploiting label correlations is a challenging and crucial problem especially in multi-label learning context. Moreover, several existing systems can recommend tags for web services based on existing manual tags. In most cases, the manual tags have better quality. We also develop three strategies to automatically recommend the best tags for web services. We also propose, in this paper, WS-Portal; An Enriched Web Services Search Engine which contains 7063 providers, 115 sub-classes of category and 22236 web services crawled from the Internet. In WS-Portal, severals technologies are employed to improve the effectiveness of web service discovery (i.e. web services clustering, tags recommendation, services rating and monitoring. Our experiments are performed out based on real-world web services. The comparisons of Precision@n, Normalised Discounted Cumulative Gain (NDCGn values for our approach indicate that the method presented in this paper outperforms the method based on the CorrLDA in terms of ranking and quality of generated tags.

  19. Isolation by distance, web service

    Directory of Open Access Journals (Sweden)

    Bohonak Andrew J

    2005-03-01

    Full Text Available Abstract Background The population genetic pattern known as "isolation by distance" results from spatially limited gene flow and is a commonly observed phenomenon in natural populations. However, few software programs exist for estimating the degree of isolation by distance among populations, and they tend not to be user-friendly. Results We have created Isolation by Distance Web Service (IBDWS a user-friendly web interface for determining patterns of isolation by distance. Using this site, population geneticists can perform a variety of powerful statistical tests including Mantel tests, Reduced Major Axis (RMA regression analysis, as well as calculate FST between all pairs of populations and perform basic summary statistics (e.g., heterozygosity. All statistical results, including publication-quality scatter plots in Postscript format, are returned rapidly to the user and can be easily downloaded. Conclusion IBDWS population genetics analysis software is hosted at http://phage.sdsu.edu/~jensen/ and documentation is available at http://www.bio.sdsu.edu/pub/andy/IBD.html. The source code has been made available on Source Forge at http://sourceforge.net/projects/ibdws/.

  20. Building Grid applications using Web Services

    CERN Document Server

    CERN. Geneva

    2004-01-01

    There has been a lot of discussion within the Grid community about the use of Web Services technologies in building large-scale, loosely-coupled, cross-organisation applications. In this talk we are going to explore the principles that govern Service-Oriented Architectures and the promise of Web Services technologies for integrating applications that span administrative domains. We are going to see how existing Web Services specifications and practices could provide the necessary infrastructure for implementing Grid applications. Biography Dr. Savas Parastatidis is a Principal Research Associate at the School of Computing Science, University of Newcastle upon Tyne, UK. Savas is one of the authors of the "Grid Application Framework based on Web Services Specifications and Practices" document that was influential in the convergence between Grid and Web Services and the move away from OGSI (more information can be found at http://www.neresc.ac.uk/ws-gaf). He has done research on runtime support for distributed-m...

  1. Daios : Efficient Dynamic Web Service Invocation

    NARCIS (Netherlands)

    Leitner, Philipp; Rosenberg, Florian; Dustdar, Schahram

    2009-01-01

    Systems based on the service-oriented architecture (SOA) paradigm must be able to bind to arbitrary Web services at runtime. However, current service frameworks are predominantly used through precompiled service-access components, which are invariably hard-wired to a specific service provider. The D

  2. ChemSpell Web Service API

    Data.gov (United States)

    U.S. Department of Health & Human Services — The ChemSpell Web Service API provides chemical name spell checking and chemical name synonym look-up. ChemSpell contains more than 1.3 million chemical names...

  3. A Middleware road towards Web (Grid) Services

    CERN Document Server

    Ahmed, Zeeshan

    2010-01-01

    Middleware technologies is a very big field, containing a strong already done research as well as the currently running research to confirm already done research's results and the to have some new solution by theoretical as well as the experimental (practical) way. This document has been produced by Zeeshan Ahmed (Student: Connectivity Software Technologies Blekinge Institute of Technologies). This describes the research already done in the field of middleware technologies including Web Services, Grid Computing, Grid Services and Open Grid Service Infrastructure & Architecture. This document concludes with the overview of Web (Grid) Service, Chain of Web (Grid) Services and the necessary security issue.

  4. NISS WebSwap: A Web Service for Data Swapping

    Directory of Open Access Journals (Sweden)

    Ashish Sanil

    2003-03-01

    Full Text Available Data swapping is a statistical disclosure limitation practice that alters records in the data to be released by switching values of attributes across pairs of records in a fraction of the original data. Web Services are an exciting new form of distributed computing that allow users to invoke remote applications nearly transparently. National Institute of Statistical Sciences (NISS has recently started hosting NISS Web Services as a service and example to the statistical sciences community. In this paper we describe and provide usage information for NISS WebSwap the initial NISS Web Service, which swaps one or more attributes (fields between user-specified records in a microdata file, uploading the original data file from the user's computer and downloading the file containing the swapped records.

  5. Java ME Clients for XML Web Services

    Directory of Open Access Journals (Sweden)

    Paul POCATILU

    2008-01-01

    Full Text Available Using Web services in developing applications has many advantages like the existence of standards, multiple software platforms that support them, and many areas of usage. These advantages derive from the XML and Web technologies. This paper describes the stages in the development of a Web service client for Java ME platform and presents examples based on kSOAP and JSR 172.

  6. Nonblocking Scheduling for Web Service Transactions

    DEFF Research Database (Denmark)

    Alrifai, Mohammad; Balke, Wolf-Tilo; Dolog, Peter

    2007-01-01

    For improved flexibility and concurrent usage existing transaction management models for Web services relax the isolation property of Web service-based transactions. Correctness of the concurrent execution then has to be ensured by commit order-preserving transaction schedulers. However, local...

  7. Prototyping Web Services based Network Monitoring

    NARCIS (Netherlands)

    Drevers, Thomas; van de Meent, R.; Pras, Aiko; Harjo, J.; Moltchanov, D.; Silverajan, B.

    Web services is one of the emerging approaches in network management. This paper describes the design and implementation of four Web services based network monitoring prototypes. Each prototype follows a speci��?c approach to retrieve management data, ranging from retrieving a single management

  8. Building GIS Web Services on JXTA Network

    Institute of Scientific and Technical Information of China (English)

    WANG Leichun; GUAN Jihong; ZHOU Shuigeng

    2004-01-01

    In recent years, Web services and Peer-to-Peer (or simply P2P) appear as two of the hottest research topics in network computing. On the one hand, by adopting a decentralized, network-based style, P2P technologies can make P2P systems enhance overall reliability and fault-tolerance, increase autonomy, and enable ad-hoc communication and collaboration. On the other hand, Web services provides a good approach to integrate various heterogeneous systems and applications into a cooperative environment. This paper presents the techniques of combining Web services and P2P technologies into GIS to construct a new generation of GIS, which is more flexible and cooperative. As a case study, an ongoing project JGWS is introduced, which is an experimental GIS Web services platform built on JXTA. This paper also explores the schemes of building GIS Web services in a P2P environment.

  9. Correlated Topic Model for Web Services Ranking

    Directory of Open Access Journals (Sweden)

    Mustapha AZNAG

    2013-07-01

    Full Text Available With the increasing number of published Web services providing similar functionalities, it’s very tedious for a service consumer to make decision to select the appropriate one according to her/his needs. In this paper, we explore several probabilistic topic models: Probabilistic Latent Semantic Analysis (PLSA, Latent Dirichlet Allocation (LDA and Correlated Topic Model (CTM to extract latent factors from web service descriptions. In our approach, topic models are used as efficient dimension reduction techniques, which are able to capture semantic relationships between word-topic and topic-service interpreted in terms of probability distributions. To address the limitation of keywords-based queries, we represent web service description as a vector space and we introduce a new approach for discovering and ranking web services using latent factors. In our experiment, we evaluated our Service Discovery and Ranking approach by calculating the precision (P@n and normalized discounted cumulative gain (NDCGn.

  10. Space Physics Data Facility Web Services

    Science.gov (United States)

    Candey, Robert M.; Harris, Bernard T.; Chimiak, Reine A.

    2005-01-01

    The Space Physics Data Facility (SPDF) Web services provides a distributed programming interface to a portion of the SPDF software. (A general description of Web services is available at http://www.w3.org/ and in many current software-engineering texts and articles focused on distributed programming.) The SPDF Web services distributed programming interface enables additional collaboration and integration of the SPDF software system with other software systems, in furtherance of the SPDF mission to lead collaborative efforts in the collection and utilization of space physics data and mathematical models. This programming interface conforms to all applicable Web services specifications of the World Wide Web Consortium. The interface is specified by a Web Services Description Language (WSDL) file. The SPDF Web services software consists of the following components: 1) A server program for implementation of the Web services; and 2) A software developer s kit that consists of a WSDL file, a less formal description of the interface, a Java class library (which further eases development of Java-based client software), and Java source code for an example client program that illustrates the use of the interface.

  11. Semantic Web Services and Its Approaches

    Directory of Open Access Journals (Sweden)

    Tauqeer Ahmad Usmani,

    2011-07-01

    Full Text Available OWL-S, IRS, WSMF are the prominent field that are the major part for Semantic Web Services. IRS-III is the first WSMO Compliant and implemented structure to support Semantic Web Services.IRS-III is the extension of previous version of IRS-II and supporting WSMO ontology within the IRS-III Server, browser and API.IRS-III provides support for the OWL-S service descriptions by importing the description to IRS-III. This paper describes about different approaches of Semantic WebServices.

  12. On the performance of web services

    CERN Document Server

    Tari, Zahir; Jayasinghe, Malith

    2011-01-01

    Performance of Web Services provides innovative techniques to improve the performance of Web Services, as well as QoS (Quality of Service) requirements. This includes Qos performance, reliability and security. The author presents two levels of Web Services: the ""kernel"" (ithe SOAP engine which delivers messages from one point to another through various networks), and the ""server side"" (which processes heavy load / requests). The primary objective of this book is execution of applications delivered in a timely fashion. Case studies and examples are provided throughout this book.

  13. Web service automatic composition based on semantic relationship graph%基于语义关系图的Web服务自动组合方法

    Institute of Scientific and Technical Information of China (English)

    冯建周; 孔令富; 王晓寰

    2012-01-01

    针对基于图搜索实现Web服务自动组合存在搜索空间太大以及难以表达各种组合结构的问题,提出一种基于语义匹配关系确定组合结构的方法。该方法首先对Web服务进行形式化的语义描述,然后基于语义匹配关系,将服务库中只与用户请求的输入输出关联的服务构成语义关系图。在此基础上,基于语义匹配关系定义各种组合结构模型,以综合语义匹配度为寻优目标改进广度优先搜索算法,定义不同结构的语义匹配度计算方法,生成一条综合语义匹配度最优的Web服务组合路径。通过实例验证了该算法的可行性。%The method based on graph search was a simple and direct way to realize the Web service automatic composition, hut the search space was too large and it was difficult to express various combination structures among serv ices. To solve this problem, a method based on semantic matching relationship to determine combination structure was presented. Formal description of the Web services semantics were presented, and then based on semantic matehing relationship, the semantic relationship graph was established by services which were only related to user provided input and expected output. On this basis, various combination structure models were defined based on semantic matching relationship, and taking integrated semantic matching degree as optimal goal, the breadth-first search algorithm was improved, the calculation method of semantic matching degree in various combination structure was defined, and the service combination path which owned the optimal integrated semantic matching degree was generated. The feasibility of proposed algorithm was verified though an example.

  14. Improving query services of web map by web mining

    Science.gov (United States)

    Huang, Maojun

    2007-11-01

    Web map is the hybrid of map and the World Wide Web (known as Web). It is usually created with WebGIS techniques. With the rapid social development, web maps oriented the public are facing pressure that dissatisfy the increased demanding. The geocoding database plays a key role in supporting query services effectively. The traditional geocoding method is laborious and time-consuming. And there is much online spatial information, which would be the supplementary information source for geocoding. Therefore, this paper discusses how to improve query services by web mining. The improvement can be described from three facets: first, improving location query by discovering and extracting address information from the Web to extend geocoding database. Second, enhancing the ability of optimum path query of public traffic and buffer query by spatial analyzing and reasoning on the extended geocoding database. Third, adjusting strategies of collecting data according to patterns discovered by web map query mining. Finally, this paper presents the designing of the application system and experimental results.

  15. Change management for semantic web services

    CERN Document Server

    Liu, Xumin; Bouguettaya, Athman

    2011-01-01

    Change Management for Semantic Web Services provides a thorough analysis of change management in the lifecycle of services for databases and workflows, including changes that occur at the individual service level or at the aggregate composed service level. This book describes taxonomy of changes that are expected in semantic service oriented environments. The process of change management consists of detecting, propagating, and reacting to changes. Change Management for Semantic Web Services is one of the first books that discuss the development of a theoretical foundation for managing changes

  16. Java Web Services up and running

    CERN Document Server

    Kalin, Martin

    2009-01-01

    This quick, practical, and thorough introduction to Java web services -- the JAX-WS and JAX-RS APIs -- offers a mix of architectural overview, complete working code examples, and short yet precise instructions for compiling, deploying, and executing a sample application. You'll not only learn how to write web services from scratch, but also how to integrate existing services into your Java applications.

  17. Transimulation - protein biosynthesis web service.

    Directory of Open Access Journals (Sweden)

    Marlena Siwiak

    Full Text Available Although translation is the key step during gene expression, it remains poorly characterized at the level of individual genes. For this reason, we developed Transimulation - a web service measuring translational activity of genes in three model organisms: Escherichia coli, Saccharomyces cerevisiae and Homo sapiens. The calculations are based on our previous computational model of translation and experimental data sets. Transimulation quantifies mean translation initiation and elongation time (expressed in SI units, and the number of proteins produced per transcript. It also approximates the number of ribosomes that typically occupy a transcript during translation, and simulates their propagation. The simulation of ribosomes' movement is interactive and allows modifying the coding sequence on the fly. It also enables uploading any coding sequence and simulating its translation in one of three model organisms. In such a case, ribosomes propagate according to mean codon elongation times of the host organism, which may prove useful for heterologous expression. Transimulation was used to examine evolutionary conservation of translational parameters of orthologous genes. Transimulation may be accessed at http://nexus.ibb.waw.pl/Transimulation (requires Java version 1.7 or higher. Its manual and source code, distributed under the GPL-2.0 license, is freely available at the website.

  18. Transimulation - protein biosynthesis web service.

    Science.gov (United States)

    Siwiak, Marlena; Zielenkiewicz, Piotr

    2013-01-01

    Although translation is the key step during gene expression, it remains poorly characterized at the level of individual genes. For this reason, we developed Transimulation - a web service measuring translational activity of genes in three model organisms: Escherichia coli, Saccharomyces cerevisiae and Homo sapiens. The calculations are based on our previous computational model of translation and experimental data sets. Transimulation quantifies mean translation initiation and elongation time (expressed in SI units), and the number of proteins produced per transcript. It also approximates the number of ribosomes that typically occupy a transcript during translation, and simulates their propagation. The simulation of ribosomes' movement is interactive and allows modifying the coding sequence on the fly. It also enables uploading any coding sequence and simulating its translation in one of three model organisms. In such a case, ribosomes propagate according to mean codon elongation times of the host organism, which may prove useful for heterologous expression. Transimulation was used to examine evolutionary conservation of translational parameters of orthologous genes. Transimulation may be accessed at http://nexus.ibb.waw.pl/Transimulation (requires Java version 1.7 or higher). Its manual and source code, distributed under the GPL-2.0 license, is freely available at the website.

  19. Between Shots TRANSP Web Service

    Science.gov (United States)

    Feibush, E.; Andre, R.; Ludescher-Furth, C.; Kaye, S.; McCune, D.

    2008-11-01

    Running TRANSP between NSTX shots requires rapid data preparation and job submittal. A web service with a graphical user interface and data visualization has been developed to meet these goals. The underlying data preparation system has a command line interface written in Python and runs on a PPPL compute server. The display client is a Java program (ElVis) that sends requests to the data preparation system. As the run data is prepared, graphs are created and sent to the client for display. Flux surface plots are displayed and animated over time. The most commonly used control options are implemented in the UI as buttons and text fields. A time slice or time dependent run can be prepared. The command line interface is available in the client program for expert users to apply advanced settings, to prototype new UI buttons, and to run scripts. The client program contains a simple text editor for modifying the TRANSP namelist. When data preparation is complete the run is submitted to the TRANSP production system. The initial version has been deployed and is being tested in the control room setting. Results will be discussed in the poster presentation. Work performed at PPPL under the auspices of U.S. DOE Contract DE-AC02-76CH03073.

  20. Consuming Web Services on Mobile Platforms

    Directory of Open Access Journals (Sweden)

    Alin COBARZAN

    2010-01-01

    Full Text Available Web services are an emerging technology that provides interoperability between applications running in different platforms. The Web services technology provide the best approach to Service Oriented Architecture envision of component collaboration for better business re-quirements fulfilment in large enterprise systems. The challenges in implementing Web services consuming clients for low-resources mobile devices connected through unreliable wireless connections are delimited. The paper also presents a communication architecture that moves the heavy load of XML-based messaging system from the mobile clients to an external middleware component. The middleware component will act like a gateway that lightly com-municates with the device in a client-server manner over a fast binary protocol and at the same time takes the responsibility of solving the request to the Web service.

  1. ServiceStore: A Peer-to-Peer Framework for QoS-aware Service Composition

    OpenAIRE

    Jin,Jun; Zhang, Yu; Cao, Yuanda; Pu, Xing; Li, Jiaxin

    2010-01-01

    International audience; Web service composition is to integrate component services for providing a value-added new service. With the growing number of component services and their dynamic nature, the centralized composition model can't manage them efficiently and accurately. In this paper, we proposed a distributed hash table (DHT)-based peer-to-peer (P2P) service composition framework, called ServiceStore. Compared with the central control in centralized model, in our ServiceStore, service s...

  2. Mandatory Class 1 Federal Areas Web Service

    Data.gov (United States)

    U.S. Environmental Protection Agency — This web service contains the following layers: Mandatory Class 1 Federal Area polygons and Mandatory Class 1 Federal Area labels in the United States. The polygon...

  3. Region 9 2010 Census Web Service

    Data.gov (United States)

    U.S. Environmental Protection Agency — This web service displays data collected during the 2010 U.S. Census. The data are organized into layers representing Tract, Block, and Block Group visualizations....

  4. 解读Web Service

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    目前,对Web Service的介绍一股都说得不够明白,没有人能说明Web Service到底是什么。从表面上看,Web Service就是一个应用程序,它向外界暴露出一个能够通过Web进行调用的API。这就是说,你能够用编程的方法通过Web来调用这个应用程序。

  5. Domain-specific Web Service Discovery with Service Class Descriptions

    Energy Technology Data Exchange (ETDEWEB)

    Rocco, D; Caverlee, J; Liu, L; Critchlow, T J

    2005-02-14

    This paper presents DynaBot, a domain-specific web service discovery system. The core idea of the DynaBot service discovery system is to use domain-specific service class descriptions powered by an intelligent Deep Web crawler. In contrast to current registry-based service discovery systems--like the several available UDDI registries--DynaBot promotes focused crawling of the Deep Web of services and discovers candidate services that are relevant to the domain of interest. It uses intelligent filtering algorithms to match services found by focused crawling with the domain-specific service class descriptions. We demonstrate the capability of DynaBot through the BLAST service discovery scenario and describe our initial experience with DynaBot.

  6. Web services interface to EPICS channel access

    Institute of Scientific and Technical Information of China (English)

    DUAN Lei; SHEN Liren

    2008-01-01

    Web services is used in Experimental Physics and Industrial Control System (EPICS). Combined with EPICS Channel Access protocol, Web services' high usability, platform independence and language independence can be used to design a fully transparent and uniform software interface layer, which helps us complete channel data acquisition, modification and monitoring functions. This software interface layer, a cross-platform of cross-language,has good interopcrability and reusability.

  7. Engineering Compensations in Web Service Environment

    DEFF Research Database (Denmark)

    Schäfer, Micahel; Dolog, Peter; Nejdl, Wolfgang

    2007-01-01

    Business to business integration has recently been performed by employing Web service environments. Moreover, such environments are being provided by major players on the technology markets. Those environments are based on open specifications for transaction coordination. When a failure...... compensations based on forward recovery principles. We extend the existing Web service transaction coordination architecture and infrastructure in order to support flexible compensation operations. A contract-based approach is being used, which allows the specification of permitted compensations at runtime. We...

  8. Acquiring Evolving Technologies: Web Services Standards

    Science.gov (United States)

    2016-06-30

    2006 Carnegie Mellon University Acquiring Evolving Technologies: Web Services Standards Harry L. Levinson Software Engineering Institute Carnegie...Acquiring Evolving Technologies: Web Services Standards 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 5d. PROJECT...NUMBER OF PAGES 22 19a. NAME OF RESPONSIBLE PERSON a. REPORT unclassified b. ABSTRACT unclassified c. THIS PAGE unclassified Standard Form

  9. A Semantic Matchmaker for Ranking Web Services

    Institute of Scientific and Technical Information of China (English)

    Bin Xu; Po Zhang; Juan-Zi Li; Wen-Jun Yang

    2006-01-01

    This paper is concerned with the matchmaker for ranking web services by using semantics. So far several methods of semantic matchmaker have been proposed. Most of them, however, focus on classifying the services into predefined categories rather than providing a ranking result. In this paper, a new method of semantic matchmaker is proposed for ranking web services. It is proposed to use the semantic distance for estimating the matching degree between a service and a user request. Four types of semantic distances are defined and four algorithms are implemented respectively to calculate them. Experimental results show that the proposed semantic matchmaker significantly outperforms the keywordbased baseline method.

  10. Ontology Enabled Generation of Embedded Web Services

    DEFF Research Database (Denmark)

    Hansen, Klaus Marius; Zhang, Weishan; Soares, Goncalo Teofilo Afonso Pinheiro

    2008-01-01

    and software platforms, and of devices state and context changes. To address these challenges, we developed a Web service compiler, Limbo, in which Web Ontology Language (OWL) ontologies are used to make the Limbo compiler aware of its compilation context, such as targeted hardware and software. At the same...... time, knowledge on device details, platform dependencies, and resource/power consumption is built into the supporting ontologies, which are used to configure Limbo for generating resource efficient web service code. A state machine ontology is used to generate stub code to facilitate handling of state...

  11. Transactions Concurrency Control in Web Service Environment

    DEFF Research Database (Denmark)

    Alrifai, Mohammad; Dolog, Peter; Nejdl, Wolfgang

    2006-01-01

    on transaction dependency graphs maintained at the service provider side. We have implemented such a protocol on top of WS-Transaction. The extension on the web service provider side is simple to achieve as it can be an integral part of the service invocation mechanism. It has also an advantage from...... an engineering point of view as it does not change the way consumers or clients of web services have to be programmed. Furthermore, it avoids direct communication between transaction coordinators which preserves security by keeping the information about business transactions restricted to the coordinators which......Business transactions in web service environments run with relaxed isolation and atomicity property. In such environments, transactions can commit and roll back independently on each other. Transaction management has to reflect this issue and address the problems which result for example from...

  12. Using ESO Reflex with Web Services

    Science.gov (United States)

    Järveläinen, P.; Savolainen, V.; Oittinen, T.; Maisala, S.; Ullgrén, M. Hook, R.

    2008-08-01

    ESO Reflex is a prototype graphical workflow system, based on Taverna, and primarily intended to be a flexible way of running ESO data reduction recipes along with other legacy applications and user-written tools. ESO Reflex can also readily use the Taverna Web Services features that are based on the Apache Axis SOAP implementation. Taverna is a general purpose Web Service client, and requires no programming to use such services. However, Taverna also has some restrictions: for example, no numerical types such integers. In addition the preferred binding style is document/literal wrapped, but most astronomical services publish the Axis default WSDL using RPC/encoded style. Despite these minor limitations we have created simple but very promising test VO workflow using the Sesame name resolver service at CDS Strasbourg, the Hubble SIAP server at the Multi-Mission Archive at Space Telescope (MAST) and the WESIX image cataloging and catalogue cross-referencing service at the University of Pittsburgh. ESO Reflex can also pass files and URIs via the PLASTIC protocol to visualisation tools and has its own viewer for VOTables. We picked these three Web Services to try to set up a realistic and useful ESO Reflex workflow. They also demonstrate ESO Reflex abilities to use many kind of Web Services because each of them requires a different interface. We describe each of these services in turn and comment on how it was used

  13. Certified Web Services in Ynot

    OpenAIRE

    Wisnesky, Ryan; Malecha, Gregory Michael; Morrisett, John Gregory

    2010-01-01

    In this paper we demonstrate that it is possible to implement certi ed web systems in a way not much di erent from writing Standard ML or Haskell code, including use of imperative features like pointers, les, and socket I/O. We present a web-based course gradebook application developed with Ynot, a Coq library for certi ed imperative programming.We add a dialog-based I/O system to Ynot, and we extend Ynot's underlying Hoare logic with event traces to reason about I/O be- havior. Expressiv...

  14. MAPI: towards the integrated exploitation of bioinformatics Web Services

    Directory of Open Access Journals (Sweden)

    Karlsson Johan

    2011-10-01

    Full Text Available Abstract Background Bioinformatics is commonly featured as a well assorted list of available web resources. Although diversity of services is positive in general, the proliferation of tools, their dispersion and heterogeneity complicate the integrated exploitation of such data processing capacity. Results To facilitate the construction of software clients and make integrated use of this variety of tools, we present a modular programmatic application interface (MAPI that provides the necessary functionality for uniform representation of Web Services metadata descriptors including their management and invocation protocols of the services which they represent. This document describes the main functionality of the framework and how it can be used to facilitate the deployment of new software under a unified structure of bioinformatics Web Services. A notable feature of MAPI is the modular organization of the functionality into different modules associated with specific tasks. This means that only the modules needed for the client have to be installed, and that the module functionality can be extended without the need for re-writing the software client. Conclusions The potential utility and versatility of the software library has been demonstrated by the implementation of several currently available clients that cover different aspects of integrated data processing, ranging from service discovery to service invocation with advanced features such as workflows composition and asynchronous services calls to multiple types of Web Services including those registered in repositories (e.g. GRID-based, SOAP, BioMOBY, R-bioconductor, and others.

  15. Bridging the gap between legacy services and Web Services

    DEFF Research Database (Denmark)

    Bissyandé, Tegawendé; Réveillère, Laurent; Bromberg, Yérom-David

    2010-01-01

    . A promising solution is to implement wrappers to translate between the application layer protocols and the WS protocol. Doing so manually, however, requires a high level of expertise, in the relevant application layer protocols, in low-level network and system programming, and in the Web Service paradigm......Web Services is an increasingly used instantiation of Service-Oriented Architectures (SOA) that relies on standard Internet protocols to produce services that are highly interoperable. Other types of services, relying on legacy application layer protocols, however, cannot be composed directly...... itself. In this paper, we introduce a generative language based approach for constructing wrappers to facilitate the migration of legacy service functionalities to Web Services. To this end, we have designed the Janus domain-specific language, which provides developers with a high-level way to describe...

  16. BOWS (bioinformatics open web services) to centralize bioinformatics tools in web services.

    Science.gov (United States)

    Velloso, Henrique; Vialle, Ricardo A; Ortega, J Miguel

    2015-06-02

    Bioinformaticians face a range of difficulties to get locally-installed tools running and producing results; they would greatly benefit from a system that could centralize most of the tools, using an easy interface for input and output. Web services, due to their universal nature and widely known interface, constitute a very good option to achieve this goal. Bioinformatics open web services (BOWS) is a system based on generic web services produced to allow programmatic access to applications running on high-performance computing (HPC) clusters. BOWS intermediates the access to registered tools by providing front-end and back-end web services. Programmers can install applications in HPC clusters in any programming language and use the back-end service to check for new jobs and their parameters, and then to send the results to BOWS. Programs running in simple computers consume the BOWS front-end service to submit new processes and read results. BOWS compiles Java clients, which encapsulate the front-end web service requisitions, and automatically creates a web page that disposes the registered applications and clients. Bioinformatics open web services registered applications can be accessed from virtually any programming language through web services, or using standard java clients. The back-end can run in HPC clusters, allowing bioinformaticians to remotely run high-processing demand applications directly from their machines.

  17. Novel web service selection model based on discrete group search.

    Science.gov (United States)

    Zhai, Jie; Shao, Zhiqing; Guo, Yi; Zhang, Haiteng

    2014-01-01

    In our earlier work, we present a novel formal method for the semiautomatic verification of specifications and for describing web service composition components by using abstract concepts. After verification, the instantiations of components were selected to satisfy the complex service performance constraints. However, selecting an optimal instantiation, which comprises different candidate services for each generic service, from a large number of instantiations is difficult. Therefore, we present a new evolutionary approach on the basis of the discrete group search service (D-GSS) model. With regard to obtaining the optimal multiconstraint instantiation of the complex component, the D-GSS model has competitive performance compared with other service selection models in terms of accuracy, efficiency, and ability to solve high-dimensional service composition component problems. We propose the cost function and the discrete group search optimizer (D-GSO) algorithm and study the convergence of the D-GSS model through verification and test cases.

  18. Web Service Architecture Framework for Embedded Devices

    Science.gov (United States)

    Yanzick, Paul David

    2009-01-01

    The use of Service Oriented Architectures, namely web services, has become a widely adopted method for transfer of data between systems across the Internet as well as the Enterprise. Adopting a similar approach to embedded devices is also starting to emerge as personal devices and sensor networks are becoming more common in the industry. This…

  19. Sketching web services backends with SERPE

    NARCIS (Netherlands)

    Aprile, W.A.

    2009-01-01

    In the face of current strong commercial interest in services that, from an implementation point of view, consist of databases provided with a web API and/or a front end, there is a scarcity of tools that allow quickly sketching the service backend in order to deliver an interactive prototype. SERPE

  20. REST based service composition

    DEFF Research Database (Denmark)

    Grönvall, Erik; Ingstrup, Mads; Pløger, Morten

    2011-01-01

    This paper presents an ongoing work developing and testing a Service Composition framework based upon the REST architecture named SECREST. A minimalistic approach have been favored instead of a creating a complete infrastructure. One focus has been on the system's interaction model. Indeed, an aim...

  1. Opal web services for biomedical applications.

    Science.gov (United States)

    Ren, Jingyuan; Williams, Nadya; Clementi, Luca; Krishnan, Sriram; Li, Wilfred W

    2010-07-01

    Biomedical applications have become increasingly complex, and they often require large-scale high-performance computing resources with a large number of processors and memory. The complexity of application deployment and the advances in cluster, grid and cloud computing require new modes of support for biomedical research. Scientific Software as a Service (sSaaS) enables scalable and transparent access to biomedical applications through simple standards-based Web interfaces. Towards this end, we built a production web server (http://ws.nbcr.net) in August 2007 to support the bioinformatics application called MEME. The server has grown since to include docking analysis with AutoDock and AutoDock Vina, electrostatic calculations using PDB2PQR and APBS, and off-target analysis using SMAP. All the applications on the servers are powered by Opal, a toolkit that allows users to wrap scientific applications easily as web services without any modification to the scientific codes, by writing simple XML configuration files. Opal allows both web forms-based access and programmatic access of all our applications. The Opal toolkit currently supports SOAP-based Web service access to a number of popular applications from the National Biomedical Computation Resource (NBCR) and affiliated collaborative and service projects. In addition, Opal's programmatic access capability allows our applications to be accessed through many workflow tools, including Vision, Kepler, Nimrod/K and VisTrails. From mid-August 2007 to the end of 2009, we have successfully executed 239,814 jobs. The number of successfully executed jobs more than doubled from 205 to 411 per day between 2008 and 2009. The Opal-enabled service model is useful for a wide range of applications. It provides for interoperation with other applications with Web Service interfaces, and allows application developers to focus on the scientific tool and workflow development. Web server availability: http://ws.nbcr.net.

  2. A Fault-tolerant Method for Web Service Composition Based on Cloud Environment%一种利用云环境实现Web服务组合容错的方法

    Institute of Scientific and Technical Information of China (English)

    牛天飞; 王志坚; 叶枫; 张雪洁; 沈一尘

    2012-01-01

    With the rapid development of Web services, research of fault tolerance of service composition based on SOA become the focus of concern to the industry. Web service component failure may cause the failure of execution of whole service composition. The lack of resources and the overload of server are one of the main reasons of the failure of service components. Cloud computing is a new computing generic, its characteristics of resources integration and resources dynamic allocation provide new ideas for resolve the failures caused by resource-constrained in traditional SOA architecture. FTEL applied middleware technology to the fault-tolerant of services composition, which complete the replacement of the service component with cloud environment. The FTEL achieve the purpose of fault-tolerant of service composition, and solve the problem of failures caused by resource-constrained in traditional SOA architecture.%随着Web服务迅猛发展,基于SOA的服务组合容错性研究成为了业界关注的焦点.服务组合中组件的失效,会导致整个组合执行失败,而资源不足、服务器负载过重是引发组件失效的主要原因之一.云计算作为一种新的计算泛型,其资源整合、动态分配的特点为解决传统SOA下因资源受限而引发的失效提供了新的容错思路.FTEL层将中间件技术应用到服务组合容错上,借助云环境完成服务替换,对传统SOA下较难解决的由于资源问题引起的组件失效进行了容错.

  3. A Strategic Model of Trust Management in Web Services

    Science.gov (United States)

    Sun, Junqing; Sun, Zhaohao; Li, Yuanzhe; Zhao, Shuliang

    This article examines trust and trust management in web services and proposes a multiagent model of trust relationship in web services. It looks at the hierarchical structure of trust management in web services and proposes a strategic model of trust management in web services. The proposed approach in this article will facilitate research and development of trust management in e-commerce, web services and social networking.

  4. Fractal Adaptive Web Service for Mobile Learning

    Directory of Open Access Journals (Sweden)

    Ichraf Tirellil

    2006-06-01

    Full Text Available This paper describes our proposition for adaptive web services which is based on configurable, re-usable adaptive/personalized services. To realize our ideas, we have developed an approach for designing, implementing and maintaining personal service. This approach enables the user to accomplish an activity with a set of services answering to his preferences, his profiles and to a personalized context. In this paper, we describe the principle of our approach that we call fractal adaptation approach, and we discuss the implementation of personalization services in the context of mobile and collaborative scenario of learning. We have realized a platform in this context -a platform for mobile and collaborative learning- based on fractal adaptable web services. The platform is tested with a population of students and tutors, in order to release the gaps and the advantages of the approach suggested.

  5. WEB SERVICE BASED RELIABLE - SHELTERED MEDI HELPER

    Directory of Open Access Journals (Sweden)

    L.Priya

    2011-01-01

    Full Text Available The veracity and secrecy of medical information which is transacted over the Internet is vulnerable to attack. But the transaction of such details is mandatory in order to avail the luxury of medical services anywhere, anytime. Especially in a web service enabled system for hospital management, it becomes necessary to address these security issues. It is mandatory that the services guarantee message delivery to software applications, with a chosen level of quality of service (QoS. This paper presents a VDM++ based specification for modelling a security framework for web services with non repudiation to ensure that a party in a dispute cannot repudiate, or refute the validity of a statement or contract and it is ensured that the transaction happens in a reliable manner. This model presents the procedure and technical options to have a secure communication over Internet with web services. Based on the model the Medi - Helper is developed to use the technologies of WS-Security, WS-Reliability and WS-Policy, WSRN in order to create encrypted messages so that the Patient’s medical records are not tampered with when relayed over Internet, and are sent in a reliable manner. In addition to authentication, integrity, confidentiality, as proposed in this paper security framework for healthcare based web services is equipped with non repudiation which is not inclusive in many existing frameworks.

  6. A Framework to Enhance Quality of Service for Content Delivery Network Using Web Services: A Review

    Directory of Open Access Journals (Sweden)

    K.Manivannan

    2011-09-01

    Full Text Available Content Delivery Networks (CDNs is anticipated to provide better performance delivery of content in internet through worldwide coverage, which would be a fence for new content delivery network providers. The appearance of Web as a omnipresent media for sharing content and services has led to the rapid growth of the Internet. At the same time, the number of users accessing Web-based content and services are growing exponentially. This has placed a heavy demand on Internet bandwidth and Web systems hosting content and application services. As a result, many Web sites are unable to manage this demand and offer their services in a timely manner. Content Delivery Networks (CDNs have emerged to overcome these limitations by offering infrastructure and mechanisms to deliver content and services in a scalable manner, and enhancing users Web experience. The planned research provides a framework designed to enhance QoS of Web service processes for real time servicing. QoS parameters of various domains can be combined to provide differentiated services, and allocating dynamically available resources in the midst of customers while delivering high-quality real time multimedia content. While accessing the service by a customer, it is possible to adapt real time streams to vastly changeable network conditions to give suitable quality in spite of factors upsetting Quality of service. To reach these intentions, adaptive web service processes to supply more information for determining the quality and size of the delivered object. The framework includes a section for QoS monitoring and adaptation and QoS faults prediction possibility and convalesce actions in case of failure. The aim of this research is to encourage research about quality of composite services in service-oriented architectures with security measures.

  7. Grid Enabled Geospatial Catalogue Web Service

    Science.gov (United States)

    Chen, Ai-Jun; Di, Li-Ping; Wei, Ya-Xing; Liu, Yang; Bui, Yu-Qi; Hu, Chau-Min; Mehrotra, Piyush

    2004-01-01

    Geospatial Catalogue Web Service is a vital service for sharing and interoperating volumes of distributed heterogeneous geospatial resources, such as data, services, applications, and their replicas over the web. Based on the Grid technology and the Open Geospatial Consortium (0GC) s Catalogue Service - Web Information Model, this paper proposes a new information model for Geospatial Catalogue Web Service, named as GCWS which can securely provides Grid-based publishing, managing and querying geospatial data and services, and the transparent access to the replica data and related services under the Grid environment. This information model integrates the information model of the Grid Replica Location Service (RLS)/Monitoring & Discovery Service (MDS) with the information model of OGC Catalogue Service (CSW), and refers to the geospatial data metadata standards from IS0 19115, FGDC and NASA EOS Core System and service metadata standards from IS0 191 19 to extend itself for expressing geospatial resources. Using GCWS, any valid geospatial user, who belongs to an authorized Virtual Organization (VO), can securely publish and manage geospatial resources, especially query on-demand data in the virtual community and get back it through the data-related services which provide functions such as subsetting, reformatting, reprojection etc. This work facilitates the geospatial resources sharing and interoperating under the Grid environment, and implements geospatial resources Grid enabled and Grid technologies geospatial enabled. It 2!so makes researcher to focus on science, 2nd not cn issues with computing ability, data locztic, processir,g and management. GCWS also is a key component for workflow-based virtual geospatial data producing.

  8. Sketching web services backends with SERPE

    OpenAIRE

    Aprile, W.A.

    2009-01-01

    In the face of current strong commercial interest in services that, from an implementation point of view, consist of databases provided with a web API and/or a front end, there is a scarcity of tools that allow quickly sketching the service backend in order to deliver an interactive prototype. SERPE consists of an online Python programming environment that hides the complexities of the MVC model, databases, objects and object relational mapping and builds on Google's services, letting the ser...

  9. Optimizing Decisions in Web Services Orchestrations

    OpenAIRE

    Kattepur, Ajay; Benveniste, Albert; Jard, Claude

    2011-01-01

    International audience; Web services orchestrations conventionally employ exhaustive comparison of runtime quality of service (QoS) metrics for decision making. The ability to incorporate more complex mathematical packages are needed, especially in case of workflows for resource allocation and queuing systems. By modeling such optimization routines as service calls within orchestration specifications, techniques such as linear programming can be conveniently invoked by non-specialist workflow...

  10. Recherche des services web à base de mesures de similarités.

    OpenAIRE

    MEZIANE, WISSAME SOULAF

    2015-01-01

    Les services web constituent une technologie primordial dans l'interopérabilité des applications sur le web , pour gérer leur cycle de vie (publication, recherche, sélection, composition) on se base sur les standards des web sémantique ( OWLS, WSDL,.....)

  11. Study on Web Services Security Mechanism%Web Services 安全机制研究

    Institute of Scientific and Technical Information of China (English)

    张锋军; 李勇; 牟其林

    2014-01-01

    Web services, as a mainstream technical standard for SOA implementation, has now been ap-plied extensively, and its security is worthy of high attention. This paper studies the security mechanism of Web services based-on the WS-security standards, analyses the standards it follows, and describes the function of security services. It gives an applicable Web services protection solution from the aspects of i-dentification, SOAP message security and access control based on engineer practice. This solution can im-plement the core security protection functions of Web services, and has directive significance for Web serv-ices-based SOA system's security protection.%Web Services 作为实现 SOA 的主流技术标准,得到了广泛应用,其安全性值得高度关注。基于 WS-Security 标准,对 Web Services 的安全机制进行了研究,对 Web Services 安全防护的功能、遵循的标准进行了分析,并结合工程实践,从身份识别、SOAP 消息安全防护和访问控制等方面提出了Web Services 安全防护的实现方案,可以实现核心的安全防护功能,对基于 Web Services 技术架构的系统安全防护具有指导意义。

  12. Transactions Concurrency Control in Web Service Environment

    DEFF Research Database (Denmark)

    Alrifai, Mohammad; Dolog, Peter; Nejdl, Wolfgang

    2006-01-01

    an engineering point of view as it does not change the way consumers or clients of web services have to be programmed. Furthermore, it avoids direct communication between transaction coordinators which preserves security by keeping the information about business transactions restricted to the coordinators which......Business transactions in web service environments run with relaxed isolation and atomicity property. In such environments, transactions can commit and roll back independently on each other. Transaction management has to reflect this issue and address the problems which result for example from...... concurrent access to web service resources and data. In this paper we propose an extension to the WS-Transaction Protocol which ensures the consistency of the data when independent business transactions access the data concurrently under the relaxed transaction properties. Our extension is based...

  13. An effective assemble-oriented framework for grid Web service

    Institute of Scientific and Technical Information of China (English)

    CHEN Zhang; CHEN Zhi-gang; DENG Xiao-heng; CHEN Li-xin

    2007-01-01

    An effective assemble-oriented framework for grid Web service based on open grid service architecture was proposed, in which Web service semantics network constructed by software reuse was designed to enhance the locating of assemble-oriented service resources. The successful Web services assembled structure was exploited to design semantics network, the logical and the physical structure of the resource was separated in Web service, and the logical resource derived from type ID of Web service was combined. Experiment results show that the success ratio of Web service request comes to 100% while providing completely assembly semantics set. This model provides guarantee of the reliability of assemble Web service and establishes the foundation of web service automatic interaction, customizing application service and dynamic service configuration.

  14. Web Service Interface for Data Collection

    Directory of Open Access Journals (Sweden)

    Ruchika

    2012-05-01

    Full Text Available Data collection is a key component of an information system. The widespread penetration of ICT tools in organizations and institutions has resulted in a shift in the way the data is collected. Data may be collected in printed-form, by e-mails, on a compact disk, or, by direct upload on the management information system. Since web services are platform-independent, it can access data stored in the XML format from any platform. In this paper, we present an interface which uses web services for data collection. It requires interaction between a web service deployed for the purposes of data collection, and the web address where the data is stored. Our interface requires that the web service has pre-knowledge of the address from where the data is to be collected. Also, the data to be accessed must be stored in XML format. Since our interface uses computer-supported interaction on both sides, it eases the task of regular and ongoing data collection. We apply our framework to the Education Management Information System, which collects data from schools spread across the country.

  15. Tool Supported Analysis of Web Services Protocols

    DEFF Research Database (Denmark)

    Marques, Abinoam P.; Ravn, Anders Peter; Srba, Jiri

    2011-01-01

    We describe an abstract protocol model suitable for modelling of web services and other protocols communicating via unreliable, asynchronous communication channels. The model is supported by a tool chain where the first step translates tables with state/transition protocol descriptions, often used...... e.g. in the design of web services protocols, into an intermediate XML format. We further translate this format into a network of communicating state machines directly suitable for verification in the model checking tool UPPAAL. We introduce two types of communication media abstractions in order...

  16. Evolution of web services in bioinformatics.

    Science.gov (United States)

    Neerincx, Pieter B T; Leunissen, Jack A M

    2005-06-01

    Bioinformaticians have developed large collections of tools to make sense of the rapidly growing pool of molecular biological data. Biological systems tend to be complex and in order to understand them, it is often necessary to link many data sets and use more than one tool. Therefore, bioinformaticians have experimented with several strategies to try to integrate data sets and tools. Owing to the lack of standards for data sets and the interfaces of the tools this is not a trivial task. Over the past few years building services with web-based interfaces has become a popular way of sharing the data and tools that have resulted from many bioinformatics projects. This paper discusses the interoperability problem and how web services are being used to try to solve it, resulting in the evolution of tools with web interfaces from HTML/web form-based tools not suited for automatic workflow generation to a dynamic network of XML-based web services that can easily be used to create pipelines.

  17. WEB SERVICES COMPOSING BY MULTIAGENT NEGOTIATION

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Composing web services is gained daily attention in Service Oriented Computing.It includes the dynamic discovery,interaction and coordination of agent-based semantic web services.The authors first follow Function Ontology and Automated Mechanism Design for service agents aggregating.Then the problem is formulated but it is ineffective to solve it from the traditional global view.Because the complexity is NP-complete and it is difficult or even impossible to get some personal information.This paper provides a multi-agent negotiation idea in which each participant negotiates under the condition of its reservation payoff being satisfied.Numerical experiment is given and well evaluates the negotiation.

  18. QOS Aware Formalized Model for Semantic Web Service Selection

    Directory of Open Access Journals (Sweden)

    Divya Sachan

    2014-10-01

    Full Text Available Selecting the most relevant Web Service according to a client requirement is an onerous task, as innumerous number of functionally same Web Services(WS are listed in UDDI registry. WS are functionally same but their Quality and performance varies as per service providers. A web Service Selection Process involves two major points: Recommending the pertinent Web Service and avoiding unjustifiable web service. The deficiency in keyword based searching is that it doesn’t handle the client request accurately as keyword may have ambiguous meaning on different scenarios. UDDI and search engines all are based on keyword search, which are lagging behind on pertinent Web service selection. So the search mechanism must be incorporated with the Semantic behavior of Web Services. In order to strengthen this approach, the proposed model is incorporated with Quality of Services (QoS based Ranking of semantic web services.

  19. Smart: Semantically Mashup Rest Web Services

    Directory of Open Access Journals (Sweden)

    Rima Kilany

    2013-10-01

    Full Text Available A mashup is a combination of information from more than one source, mixed up in a way to create something new, or at least useful. Anyone can find mashups on the internet, but these are always specifically designed for a predefined purpose. To change that fact, we implemented a new platform we called the SMART platform. SMART enables the user to make his own choices as for the REST web services he needs to call in order to build an intelligent personalized mashup, from a Google-like simple search interface, without needing any programming skills. In order to achieve this goal, we defined an ontology that can hold REST web services descriptions. These descriptions encapsulate mainly, the input type needed for a service, its output type, and the kind of relation that ties the input to the output. Then, by matching the user input query keywords, with the REST web services definitions in our ontology, we can find registered services individuals in this ontology, and construct the raw REST query for each service found. The wrap up from the keywords, into semantic definitions, in order to find the matching service individual, then the wrap down from the semantic service description of the found individual, to the raw REST call, and finally the wrap up of the result again into semantic individuals, is done for two main purposes: the first to let the user use simple keywords in order to build complex mashups, and the second to benefit from the ontology’s inference engine in a way, where services instances can be tied together into an intelligent mashup, simply by making each service output individuals, stand as the next service input.

  20. CMR Catalog Service for the Web

    Science.gov (United States)

    Newman, Doug; Mitchell, Andrew

    2016-01-01

    With the impending retirement of Global Change Master Directory (GCMD) Application Programming Interfaces (APIs) the Common Metadata Repository (CMR) was charged with providing a collection-level Catalog Service for the Web (CSW) that provided the same level of functionality as GCMD. This talk describes the capabilities of the CMR CSW API with particular reference to the support of the Committee on Earth Observation Satellites (CEOS) Working Group on Information Systems and Services (WGISS) Integrated Catalog (CWIC).

  1. Web服务组合规范WS-CDL的类型化形式化模型%Typed formal model for WS-CDL specification of web services composition

    Institute of Scientific and Technical Information of China (English)

    辜希武; 李瑞轩; 卢正鼎

    2008-01-01

    In order to formally reason and verify web services composition described by web services choreography specification WS- CDL, a typed formal model named typed abstract WS-CDL (web services choreography description language)for WS-CDL specifications is proposed. In typed abstract WS-CDL, the syntax of type and session, typing rules and operational semantics are formalized; the collaborations of web services are formally described by sessions; the operational semantics of a session can help to formally reason the execution of the choreography; the typing rules can help to formally check the data type consistency of exchanged information between web services and capture run-time errors due to type mismatches. Particularly, the concepts of type assumption set extension and type assumption set compatibility are proposed, and the merging algorithm of type assumption sets is defined so as to eliminate type assumption conflict. Based on the formal model, typed mapping rules for mapping web services choreography to orchestration is also defined. With the typed mapping rules, orchestration stubs and their type assumption sets can be generated from a given choreography; thus, web services composition can be verified at choreography and orchestration levels, respectively. The model is proved to have properties of type safety, and how the model can help to reason and verify web services composition is illustrated through a case study.%为了形式化地推理和验证web服务编排规范WS-CDL所描述的web服务组合,提出了一个WS-CDL规范的类型化形式化模型——typed abstract WS-CDL.在typed abstract WS-CDL中,定义了类型和会话的语法、类型判定规则和操作语义;web服务问的协作由会话来描述;利用会话的操作语义能对web服务编排的执行进行推理;利用类型判定规则能检查web服务间交换信息类型一致性并捕获由于类型不一致导致的运行时错误.特别地提出了类型假设集的外延和

  2. Towards Web Service-Based Educational Systems

    Science.gov (United States)

    Sampson, Demetrios G.

    2005-01-01

    The need for designing the next generation of web service-based educational systems with the ability of integrating components from different tools and platforms is now recognised as the major challenge in advanced learning technologies. In this paper, we discuss this issue and we present the conceptual design of such environment, referred to as…

  3. On the Use of Social Networks in Web Services: Application to the Discovery Stage

    Science.gov (United States)

    Maamar, Zakaria; Wives, Leandro Krug; Boukadi, Khouloud

    This chapter discusses the use of social networks in Web services with focus on the discovery stage that characterizes the life cycle of these Web services. Other stages in this life cycle include description, publication, invocation, and composition. Web services are software applications that end users or other peers can invoke and compose to satisfy different needs such as hotel booking and car rental. Discovering the relevant Web services is, and continues to be, a major challenge due to the dynamic nature of these Web services. Indeed, Web services appear/disappear or suspend/resume operations without prior notice. Traditional discovery techniques are based on registries such as Universal Description, Discovery and Integration (UDDI) and Electronic Business using eXtensible Markup Language (ebXML). Unfortunately, despite the different improvements that these techniques have been subject to, they still suffer from various limitations that could slow down the acceptance trend of Web services by the IT community. Social networks seem to offer solutions to some of these limitations but raise, at the same time, some issues that are discussed in this chapter. The contributions of this chapter are three: social network definition in the particular context of Web services; mechanisms that support Web services build, use, and maintain their respective social networks; and social networks adoption to discover Web services.

  4. WebGen-WPS – Web service for cartographic generalization

    Directory of Open Access Journals (Sweden)

    Kristina Jezdić

    2013-06-01

    Full Text Available The development of web services technology and standardization of spa­tial data usage have initiated the process of automatization of cartogra­phic generalization on the Internet.There are two ways by which web supported cartographic generalization can be accomplished (Foerster 2010:1. Limited control of data representation (selection of layers and symbolization2. Complete control of the generalization process (usage of all generalization procedures with selection of specific parametersThe first option is for users that are amateurs in cartographic generalization, and it enables them to have limited control over the shaping of map content. The second option is intended to be used by experts in cartographic generalization which would support development of automated systems for cartographic generalization.

  5. Revenue optimization of service compositions using conditional request retries

    NARCIS (Netherlands)

    Živković, M.; Berg, H. van den

    2013-01-01

    Due to the inherent stochastic nature of services execution environment within service oriented systems, a runtime adaptation of the given composition may be required. We address a runtime service adaptation mechanism based on conditional retries for the orchestrated web services. The conditional re

  6. Extending Interactive Web Services for Improving Presentation Level Integration in Web Portals

    Institute of Scientific and Technical Information of China (English)

    Jing-Yu Song; Jun Wei; Shu-Chao Wan; Tao Huang

    2006-01-01

    Presentation level integration now becomes an important and fast growing trend in enterprise computing.Portal-based composite applications use portlet and interactive web service, which usually offers several portlets, as their basic constituents. Hence, portlet description and discovery are the key issues that have to be considered for the development of portal-based composite applications. This paper proposes a novel concept POI (Presentation Oriented Interface) to describe the presentation features of a portlet, so that interactive web services may be extended to facilitate the selection and interoperation of portlets. Portlet discovery can be effectively achieved based on the calculation of POI similarity that considers both type and structure similarity. Experiments show that the proposed approach can improve the satisfaction of portlet discovery, and also facilitate the portlet interoperation, thereby achieving better application integration at presentation level.

  7. Web服务组合编辑器的设计与实现%Design and Implementation of Web Services Composition Editor

    Institute of Scientific and Technical Information of China (English)

    赵会群; 申宁

    2012-01-01

      针对现有的Web组合编辑器存在描述组合的方式不够全面和以一种紧耦合方式组合Web服务的问题,该文从软件体系结构的角度提出组合Web服务方法的新观点。 Web服务视为可复用的软件体系结构的实体时,采用组件连接运算的方式来组合Web服务,该文中也提及相应的Web服务组合运算子,生成一个WS-BPEL(Web Service Business Process Execution Language)的连接器。最后通过WS-CDL(Web Service Choreography Description Language)把每个BPEL连接器组装到一起,形成一个完整的模型。该文最后给出了支持Web服务组合建模方法的工具,用以说明该方法的可行性。

  8. Focused Crawling of the Deep Web Using Service Class Descriptions

    Energy Technology Data Exchange (ETDEWEB)

    Rocco, D; Liu, L; Critchlow, T

    2004-06-21

    Dynamic Web data sources--sometimes known collectively as the Deep Web--increase the utility of the Web by providing intuitive access to data repositories anywhere that Web access is available. Deep Web services provide access to real-time information, like entertainment event listings, or present a Web interface to large databases or other data repositories. Recent studies suggest that the size and growth rate of the dynamic Web greatly exceed that of the static Web, yet dynamic content is often ignored by existing search engine indexers owing to the technical challenges that arise when attempting to search the Deep Web. To address these challenges, we present DynaBot, a service-centric crawler for discovering and clustering Deep Web sources offering dynamic content. DynaBot has three unique characteristics. First, DynaBot utilizes a service class model of the Web implemented through the construction of service class descriptions (SCDs). Second, DynaBot employs a modular, self-tuning system architecture for focused crawling of the DeepWeb using service class descriptions. Third, DynaBot incorporates methods and algorithms for efficient probing of the Deep Web and for discovering and clustering Deep Web sources and services through SCD-based service matching analysis. Our experimental results demonstrate the effectiveness of the service class discovery, probing, and matching algorithms and suggest techniques for efficiently managing service discovery in the face of the immense scale of the Deep Web.

  9. EnviroAtlas National Layers Master Web Service

    Data.gov (United States)

    U.S. Environmental Protection Agency — This EnviroAtlas web service supports research and online mapping activities related to EnviroAtlas (https://www.epa.gov/enviroatlas). This web service includes...

  10. EnviroAtlas Community Block Group Metrics Web Service

    Data.gov (United States)

    U.S. Environmental Protection Agency — This EnviroAtlas web service supports research and online mapping activities related to EnviroAtlas (https://www.epa.gov/enviroatlas). This web service includes...

  11. Managing and Querying Web Services Communities: A Survey

    CERN Document Server

    Limam, Hela

    2011-01-01

    With the advance of Web Services technologies and the emergence of Web Services into the information space, tremendous opportunities for empowering users and organizations appear in various application domains including electronic commerce, travel, intelligence information gathering and analysis, health care, digital government, etc. However, the technology to organize, search, integrate these Web Services has not kept pace with the rapid growth of the available information space. The number of Web Services to be integrated may be large and continuously changing. To ease and improve the process of Web services discovery in an open environment like the Internet, it is suggested to gather similar Web services into groups known as communities. Although Web services are intensively investigated, the community management issues have not been addressed yet In this paper we draw an overview of several Web services Communities' management approaches based on some currently existing communities platforms and framework...

  12. A Web Services Data Analysis Grid

    Energy Technology Data Exchange (ETDEWEB)

    William A Watson III; Ian Bird; Jie Chen; Bryan Hess; Andy Kowalski; Ying Chen

    2002-07-01

    The trend in large-scale scientific data analysis is to exploit compute, storage and other resources located at multiple sites, and to make those resources accessible to the scientist as if they were a single, coherent system. Web technologies driven by the huge and rapidly growing electronic commerce industry provide valuable components to speed the deployment of such sophisticated systems. Jefferson Lab, where several hundred terabytes of experimental data are acquired each year, is in the process of developing a web-based distributed system for data analysis and management. The essential aspects of this system are a distributed data grid (site independent access to experiment, simulation and model data) and a distributed batch system, augmented with various supervisory and management capabilities, and integrated using Java and XML-based web services.

  13. 基于改进层级任务网络规划的Web服务自动组合%Automatic Web services composition based on improved HTN planning

    Institute of Scientific and Technical Information of China (English)

    萧毅鸿; 周献中; 朱亮; 苏正炼; 陆晓明

    2012-01-01

    为了在单一Web服务无法满足问题求解需求时可以自动地组合多个Web服务以解决复杂问题,利用服务本体描述语言OWL-S对常规Web服务进行语义封装,并选用层级任务网络(HTN)规划作为技术手段.在分析了OWL-S与HTN的相似性后,对HTN的操作算子(operator)和方法(method)定义进行改写,并对常规HTN规划算法进行扩展,使之成为具有领域知识的HTN规划,更适用于解决领域相关的服务组合问题.最后提出了一种基于改进HTN规划的服务自动组合规划器框架并搭建了试验系统.案例研究结果表明,这种改进的HTN规划算法在领域本体的配合下可以有效支持Web服务的自动组合.%In order to solve complex problems by automatical compositing of several Web services for no exact single one, an ontology language of web services called OWL-S was applied in semantic encapsulation of Web services with an AI planning method called hierarchical task network ( HTN) as technical means. Based on the similarity analysis of OWL-S and HTN, the operator and method definitions of HTN were redefined, and the conventional HTN planning algorithm was extended to semantic HTN. Based on a set of OWL-S descriptions and improved HTN planning, a planner frame for supporting services composition was introduced to establish experimental system. The results of case study show that automatic Web services composition with domain ontology can be availably realized by the improved HTN planning algorithm.

  14. Intelligent Integration of Information and Services on the Web

    OpenAIRE

    Stroulia, Eleni

    2002-01-01

    The evolution of the World Wide Web from a repository of HTML data to a source of varied distributed services creates exciting opportunities for offering complex, integrated services over the web. The syntactic problems of such integration are being addressed by the advent of the web services stack of standards.1 However, the promise of service integration will not be delivered unless services can be integrated semantically as well. The 2002 AAAI workshop entitled "Intelligent Service Integra...

  15. Fairness-guaranteed reputation propagation in Web service composition%服务组合中保障公平性的信誉传播算法

    Institute of Scientific and Technical Information of China (English)

    张涛; 马建峰; 莫若; 李琦; 习宁

    2016-01-01

    In service-oriented environment, it is difficult to evaluate component services because of the opaque characteristic of composite services, the complex invocation structures and the subjective reputation rating of service consumers. To address these issues, this paper proposes a reputation propagation algorithm for service composition, in which the subjective ratings can be fairly propagated to each component service. The algorithm first models service composition as the Beta-mixture, and learns the reputation and responsibility of each component by the EM algorithm. Then, based on the characteristics of Shapley values in cooperative gaming theory, the algorithm computes the contribution of each component to its composition, ensuring that no component would obtain extra rewards or punishments. Finally, theoretical analysis and experimental results demonstrate the fairness of the algorithm to hieratically propagate the consumer's rating to each component service.%在面向服务的环境中,服务的不透明性、组合结构的复杂性以及用户评价的主观性使得用户难以对组件服务进行有效的信誉评估.针对此问题,提出适用于服务组合的信誉传播算法,将复合服务的信誉评估值公平地传播到各个组件服务.首先,将复合服务建模为Beta混合模型,通过最大期望算法学习复合服务中各个组件的责任及信誉度.其次,基于Shapley值的合作博弈模型计算各个组件服务对复合服务的贡献度,确保所组合的各个服务不会受到额外的奖励或惩罚.最后,理论分析与实验结果表明该算法在保证公平性的前提下,能够正确地将用户提交的信誉评估层次化传播到各个组件服务.

  16. User Needs of Digital Service Web Portals: A Case Study

    Science.gov (United States)

    Heo, Misook; Song, Jung-Sook; Seol, Moon-Won

    2013-01-01

    The authors examined the needs of digital information service web portal users. More specifically, the needs of Korean cultural portal users were examined as a case study. The conceptual framework of a web-based portal is that it is a complex, web-based service application with characteristics of information systems and service agents. In…

  17. Web Services Basic Profile Version 1.0

    Science.gov (United States)

    Graham, Matthew; Schaaff, Andre; Graham, Matthew

    2010-12-01

    This document describes rules to take into account when implementing SOAP-based web services. It explains also how to check conformance to these rules. It can be read as a "Guideline to VO Web Service Interoperability" or a "How to provide interoperable VO web services".

  18. IVOA Recommendation: Web Services Basic Profile Version 1.0

    OpenAIRE

    Schaaff, Andre; Graham, Matthew

    2011-01-01

    This document describes rules to take into account when implementing SOAP-based web services. It explains also how to check conformance to these rules. It can be read as a "Guideline to VO Web Service Interoperability" or a "How to provide interoperable VO web services".

  19. A Survey on Trust-Based Web Service Provision Approaches

    DEFF Research Database (Denmark)

    Dragoni, Nicola

    2010-01-01

    The basic tenet of Service-Oriented Computing (SOC) is the possibility of building distributed applications on the Web by using Web Services as fundamental building blocks. The proliferation of such services is considered the second wave of evolution in the Internet age, moving the Web from a col...

  20. Engineering Compensations in Web Service Environment

    DEFF Research Database (Denmark)

    Schäfer, Micahel; Dolog, Peter; Nejdl, Wolfgang

    2007-01-01

    compensations based on forward recovery principles. We extend the existing Web service transaction coordination architecture and infrastructure in order to support flexible compensation operations. A contract-based approach is being used, which allows the specification of permitted compensations at runtime. We......Business to business integration has recently been performed by employing Web service environments. Moreover, such environments are being provided by major players on the technology markets. Those environments are based on open specifications for transaction coordination. When a failure...... in such an environment occurs, a compensation can be initiated to recover from the failure. However, current environments have only limited capabilities for compensations, and are usually based on backward recovery. In this paper, we introduce an engineering approach and an environment to deal with advanced...

  1. Tool Supported Analysis of Web Services Protocols

    DEFF Research Database (Denmark)

    Marques, Abinoam P.; Ravn, Anders Peter; Srba, Jiri

    2011-01-01

    e.g. in the design of web services protocols, into an intermediate XML format. We further translate this format into a network of communicating state machines directly suitable for verification in the model checking tool UPPAAL. We introduce two types of communication media abstractions in order......We describe an abstract protocol model suitable for modelling of web services and other protocols communicating via unreliable, asynchronous communication channels. The model is supported by a tool chain where the first step translates tables with state/transition protocol descriptions, often used...... to ensure the finiteness of the protocol state-spaces while still being able to verify interesting protocol properties. The translations for different kinds of communication media have been implemented and successfully tested, among others, on agreement protocols from WS-Business Activity....

  2. The Experience for the Concept of Web Service on WebSphere%基于WebSphere平台的Web Service概念实践

    Institute of Scientific and Technical Information of China (English)

    范玉珍; 顾毓清

    2003-01-01

    This paper investigates and summarizes the basic concept of Web Service, covers how to set up the fundamental Web Service structure on WebSphere platform with the provided practical example, the last section of this paper discusses the comparison between the Web Service component-based architecture and the traditional component-based architecture.

  3. Web Service Growing Pains: Understanding Services and Their Clients

    NARCIS (Netherlands)

    Espinha, T.

    2015-01-01

    At an implementation level, web services serve the basic purpose of message exchange between potentially heterogeneous software systems. Through abstracting language- and platform-specific implementations into text-based, human-readable XML and JSON-based formats, different software systems are able

  4. Web Service Growing Pains: Understanding Services and Their Clients

    NARCIS (Netherlands)

    Espinha, T.

    2015-01-01

    At an implementation level, web services serve the basic purpose of message exchange between potentially heterogeneous software systems. Through abstracting language- and platform-specific implementations into text-based, human-readable XML and JSON-based formats, different software systems are able

  5. Quick Web Services Lookup Model Based on Hierarchical Registration

    Institute of Scientific and Technical Information of China (English)

    谢山; 朱国进; 陈家训

    2003-01-01

    Quick Web Services Lookup (Q-WSL) is a new model to registration and lookup of complex services in the Internet. The model is designed to quickly find complex Web services by using hierarchical registration method. The basic concepts of Web services system are introduced and presented, and then the method of hierarchical registration of services is described. In particular, service query document description and service lookup procedure are concentrated, and it addresses how to lookup these services which are registered in the Web services system. Furthermore, an example design and an evaluation of its performance are presented.Specifically, it shows that the using of attributionbased service query document design and contentbased hierarchical registration in Q-WSL allows service requesters to discover needed services more flexibly and rapidly. It is confirmed that Q-WSL is very suitable for Web services system.

  6. Climate Model Diagnostic Analyzer Web Service System

    Science.gov (United States)

    Lee, S.; Pan, L.; Zhai, C.; Tang, B.; Kubar, T. L.; Li, J.; Zhang, J.; Wang, W.

    2015-12-01

    Both the National Research Council Decadal Survey and the latest Intergovernmental Panel on Climate Change Assessment Report stressed the need for the comprehensive and innovative evaluation of climate models with the synergistic use of global satellite observations in order to improve our weather and climate simulation and prediction capabilities. The abundance of satellite observations for fundamental climate parameters and the availability of coordinated model outputs from CMIP5 for the same parameters offer a great opportunity to understand and diagnose model biases in climate models. In addition, the Obs4MIPs efforts have created several key global observational datasets that are readily usable for model evaluations. However, a model diagnostic evaluation process requires physics-based multi-variable comparisons that typically involve large-volume and heterogeneous datasets, making them both computationally- and data-intensive. In response, we have developed a novel methodology to diagnose model biases in contemporary climate models and implementing the methodology as a web-service based, cloud-enabled, provenance-supported climate-model evaluation system. The evaluation system is named Climate Model Diagnostic Analyzer (CMDA), which is the product of the research and technology development investments of several current and past NASA ROSES programs. The current technologies and infrastructure of CMDA are designed and selected to address several technical challenges that the Earth science modeling and model analysis community faces in evaluating and diagnosing climate models. In particular, we have three key technology components: (1) diagnostic analysis methodology; (2) web-service based, cloud-enabled technology; (3) provenance-supported technology. The diagnostic analysis methodology includes random forest feature importance ranking, conditional probability distribution function, conditional sampling, and time-lagged correlation map. We have implemented the

  7. A generalized Web Service response time metric to support collaborative and corroborative Web Service monitoring

    CSIR Research Space (South Africa)

    Makitla, I

    2015-12-01

    Full Text Available In this paper, we describe the development of a generalized metric for computing response time of a web service. Such a generalized metric would help to develop consensus with regards to the meanings of contracted Quality of Service (QoS) parameters...

  8. Climate Model Diagnostic Analyzer Web Service System

    Science.gov (United States)

    Lee, S.; Pan, L.; Zhai, C.; Tang, B.; Jiang, J. H.

    2014-12-01

    We have developed a cloud-enabled web-service system that empowers physics-based, multi-variable model performance evaluations and diagnoses through the comprehensive and synergistic use of multiple observational data, reanalysis data, and model outputs. We have developed a methodology to transform an existing science application code into a web service using a Python wrapper interface and Python web service frameworks. The web-service system, called Climate Model Diagnostic Analyzer (CMDA), currently supports (1) all the observational datasets from Obs4MIPs and a few ocean datasets from NOAA and Argo, which can serve as observation-based reference data for model evaluation, (2) many of CMIP5 model outputs covering a broad range of atmosphere, ocean, and land variables from the CMIP5 specific historical runs and AMIP runs, and (3) ECMWF reanalysis outputs for several environmental variables in order to supplement observational datasets. Analysis capabilities currently supported by CMDA are (1) the calculation of annual and seasonal means of physical variables, (2) the calculation of time evolution of the means in any specified geographical region, (3) the calculation of correlation between two variables, (4) the calculation of difference between two variables, and (5) the conditional sampling of one physical variable with respect to another variable. A web user interface is chosen for CMDA because it not only lowers the learning curve and removes the adoption barrier of the tool but also enables instantaneous use, avoiding the hassle of local software installation and environment incompatibility. CMDA will be used as an educational tool for the summer school organized by JPL's Center for Climate Science in 2014. In order to support 30+ simultaneous users during the school, we have deployed CMDA to the Amazon cloud environment. The cloud-enabled CMDA will provide each student with a virtual machine while the user interaction with the system will remain the same

  9. Web Services Security Based on XML Signature and XML Encryption

    Directory of Open Access Journals (Sweden)

    Yue-sheng Gu

    2010-09-01

    Full Text Available With the development of web services application, some issues of web services security are increasingly prominent. As a platform-independent language, XML is widely used for its high expansibility. After analysis the traditional web services security technology, this paper formulates the XML signature and encryption as the core of web services security technology, and describes how to create and verify XML signature, how to encrypt and decrypt XML data. The application of XML signature and encryption in the Web services security is illustrated.

  10. Performance Evaluation of RESTful Web Services for Mobile Devices

    OpenAIRE

    Hatem Hamad; Motaz Saad; Ramzi Abed

    2010-01-01

    Smart Mobile devices and web services are becoming very popular. Mobile devices are physically constraineddevices; low processor speed, limited memory, limited battery, and slow intermit wireless connection. This implies to take inconsideration these factors when implementing web services for mobile devices. In this paper, we evaluate the RESTful webservice for mobile devices against conventional SOAP web services. The experimental results show that RESTful web servicesoutperform conventional...

  11. A New Efficient Method for Calculating Similarity Between Web Services

    Directory of Open Access Journals (Sweden)

    T. RACHAD

    2014-08-01

    Full Text Available Web services allow communication between heterogeneous systems in a distributed environment. Their enormous success and their increased use led to the fact that thousands of Web services are present on the Internet. This significant number of Web services which not cease to increase has led to problems of the difficulty in locating and classifying web services, these problems are encountered mainly during the operations of web services discovery and substitution. Traditional ways of search based on keywords are not successful in this context, their results do not support the structure of Web services and they consider in their search only the identifiers of the web service description language (WSDL interface elements. The methods based on semantics (WSDLS, OWLS, SAWSDL… which increase the WSDL description of a Web service with a semantic description allow raising partially this problem, but their complexity and difficulty delays their adoption in real cases. Measuring the similarity between the web services interfaces is the most suitable solution for this kind of problems, it will classify available web services so as to know those that best match the searched profile and those that do not match. Thus, the main goal of this work is to study the degree of similarity between any two web services by offering a new method that is more effective than existing works.

  12. Development of an Web Service Architecture for Enterprise Application Integration

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Ji-Hyeon; Jung, Jae-Cheon; Chang, Young-Woo; Chang, Hoon-Seon; Kim, Jae-Cheol; Kim, Hang-Bae [Korea Power Engineering Company, Daejeon (Korea, Republic of); Kim, Kyu-Ho; Lee, Dong-Chul [Korea Electric Power Data Network, Daejeon (Korea, Republic of)

    2007-07-01

    The purpose of Enterprise Application Integration (EAI) is to enable the interoperability between two or more enterprise software systems. These systems, for example, can be an Enterprise Resource Planning (ERP) system, an Enterprise Asset Management (EAM) system or a Condition Monitoring system. Traditional EAI approach, based on point-to-point connection, is expensive, vendor specific with limited modules and restricted interoperability with other ERPs and applications. To overcome these drawbacks, the Web Service based EAI has emerged. It allows the integration without point to point linking and with less costs. Many approaches of Web service based EAI are combined with ORACLE, SAP, PeopleSoft, WebSphere, SIEBEL etc. as a system integration platform. The approach still has the restriction that only predefined clients can access the services. This means clients must know exactly the protocol for calling the services and if they don't have the access information they never can get the services. This is because these Web services are based on syntactic service description. In this paper, a semantic based EAI approach, that allows the uninformed clients to access the services, is introduced. The semantic EAI is designed with the Web services that have semantic service descriptions. The Semantic Web Services(SWS) are described in Web Ontology Language for Services(OWL-S), a semantic service ontology language, and advertised in Universal Description, Discovery and Integration (UDDI). Clients find desired services through the UDDI and get services from service providers through Web Service Description Language(WSDL)

  13. Web services in the retail industry

    Indian Academy of Sciences (India)

    Sudeep Mallick; Anuj Sharma; B V Kumar; S V Subrahmanya

    2005-04-01

    It is a well-known fact that the retail industry always works on razorthin margins and the key to survival lies in optimization of resources both in space and time dimensions as well as maximization of customer satisfaction. Access to timely and even real-time information to a wide variety of channel and trading partners, sales personnel, line managers, store managers etc. is the key to achieving this. Web services technology holds out a lot of promise for the retail industry in this respect. It is a platform-neutral, easy to deploy set of standards for achieving business data and process integration, without going for proprietary point to point connections. It promises to connect the information providers and information consumers across a wide variety of platforms, devices and on an on-demand basis. Being based on service-oriented architecture (SOA) principles it can also form the enabling service interface layer for other emerging technologies like BAM, BPM, mobile and RFID. In this paper, we attempt to understand information-flow needs in the retail industry and also suggest a roadmap approach by which the retail enterprise could exploit the potential of web services at minimal risk.

  14. Pragmatic Computing - A Semiotic Perspective to Web Services

    Science.gov (United States)

    Liu, Kecheng

    The web seems to have evolved from a syntactic web, a semantic web to a pragmatic web. This evolution conforms to the study of information and technology from the theory of semiotics. The pragmatics, concerning with the use of information in relation to the context and intended purposes, is extremely important in web service and applications. Much research in pragmatics has been carried out; but in the same time, attempts and solutions have led to some more questions. After reviewing the current work in pragmatic web, the paper presents a semiotic approach to website services, particularly on request decomposition and service aggregation.

  15. Climate Model Diagnostic Analyzer Web Service System

    Science.gov (United States)

    Lee, S.; Pan, L.; Zhai, C.; Tang, B.; Jiang, J. H.

    2013-12-01

    The latest Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report stressed the need for the comprehensive and innovative evaluation of climate models with newly available global observations. The traditional approach to climate model evaluation, which compares a single parameter at a time, identifies symptomatic model biases and errors but fails to diagnose the model problems. The model diagnosis process requires physics-based multi-variable comparisons that typically involve large-volume and heterogeneous datasets, making them both computationally- and data-intensive. To address these challenges, we are developing a parallel, distributed web-service system that enables the physics-based multi-variable model performance evaluations and diagnoses through the comprehensive and synergistic use of multiple observational data, reanalysis data, and model outputs. We have developed a methodology to transform an existing science application code into a web service using a Python wrapper interface and Python web service frameworks (i.e., Flask, Gunicorn, and Tornado). The web-service system, called Climate Model Diagnostic Analyzer (CMDA), currently supports (1) all the datasets from Obs4MIPs and a few ocean datasets from NOAA and Argo, which can serve as observation-based reference data for model evaluation and (2) many of CMIP5 model outputs covering a broad range of atmosphere, ocean, and land variables from the CMIP5 specific historical runs and AMIP runs. Analysis capabilities currently supported by CMDA are (1) the calculation of annual and seasonal means of physical variables, (2) the calculation of time evolution of the means in any specified geographical region, (3) the calculation of correlation between two variables, and (4) the calculation of difference between two variables. A web user interface is chosen for CMDA because it not only lowers the learning curve and removes the adoption barrier of the tool but also enables instantaneous use

  16. 基于聚类Web服务的组合服务模式规约%Web service composition pattern specification using clustering algorithm

    Institute of Scientific and Technical Information of China (English)

    石彦华; 李蜀瑜

    2011-01-01

    WSC has been an efficient and practical approach to improve the quality of Web service, but how to implement valid WSC is still an open issue. This paper proposed an WSC-pattern specification to verify the validity of WSC. First, gave the concept of WSC pattern and its methods and principles based on the analysis of function-to-function relation of the class services clustered. And then proposed its specification. Finally, gave an example resulted in the process of aircraft booking service to test the validity of WSC by using WSC-pattern specification.%Web服务组合是提高服务质量的实用方法,但如何实施有效的服务组合一直是研究的难点.基于此,提出了一种通过建立组合服务模式规约来验证服务组合有效性的方法.依据经过聚类后各个类别服务间的关联性关系分析,首先提出组合服务模式的概念和确定其方法、原则;然后给出Web服务中组合服务模式规约;最后通过使用组合服务模式规约,应用飞机订票的实验验证了Web服务组合的有效性.

  17. Web Map Services (WMS) Global Mosaic

    Science.gov (United States)

    Percivall, George; Plesea, Lucian

    2003-01-01

    The WMS Global Mosaic provides access to imagery of the global landmass using an open standard for web mapping. The seamless image is a mosaic of Landsat 7 scenes; geographically-accurate with 30 and 15 meter resolutions. By using the OpenGIS Web Map Service (WMS) interface, any organization can use the global mosaic as a layer in their geospatial applications. Based on a trade study, an implementation approach was chosen that extends a previously developed WMS hosting a Landsat 5 CONUS mosaic developed by JPL. The WMS Global Mosaic supports the NASA Geospatial Interoperability Office goal of providing an integrated digital representation of the Earth, widely accessible for humanity's critical decisions.

  18. Agent-Based Service Composition in Cloud Computing

    Science.gov (United States)

    Gutierrez-Garcia, J. Octavio; Sim, Kwang-Mong

    In a Cloud-computing environment, consumers, brokers, and service providers interact to achieve their individual purposes. In this regard, service providers offer a pool of resources wrapped as web services, which should be composed by broker agents to provide a single virtualized service to Cloud consumers. In this study, an agent-based test bed for simulating Cloud-computing environments is developed. Each Cloud participant is represented by an agent, whose behavior is defined by means of colored Petri nets. The relationship between web services and service providers is modeled using object Petri nets. Both Petri net formalisms are combined to support a design methodology for defining concurrent and parallel service choreographies. This results in the creation of a dynamic agent-based service composition algorithm. The simulation results indicate that service composition is achieved with a linear time complexity despite dealing with interleaving choreographies and synchronization of heterogeneous services.

  19. Application of PDA forest fire monitoring based on web service technology

    Institute of Scientific and Technical Information of China (English)

    Yufei ZHOU; Pengju LIU; Xiaoming TANG

    2009-01-01

    The difficulty in information communication and sharing are major problems for forest fire monitoring and early warning in China. As authors, we applied web service technology to a personal digital assistant (PDA) forest fire monitoring system and propose the framework of a monitoring system based on service-oriented architecture (SOA). At the same time, we describe the composition and function of web services from a server side and a client side. The method for developing a web service invocation engine on the PDA is introduced in detail. Finally, an example of a fire danger rating and fire weather services system are established, based on the Beijing Forest Fire Control System. The results show that the PDA forest fire monitoring system based on web services can effectively take advantage of the existing fire protection decision information services, realize real-time information interaction and sharing, and improve the level of forest fire monitoring.

  20. The Semantics of Web Services: An Examination in GIScience Applications

    Directory of Open Access Journals (Sweden)

    Xuan Shi

    2013-09-01

    Full Text Available Web service is a technological solution for software interoperability that supports the seamless integration of diverse applications. In the vision of web service architecture, web services are described by the Web Service Description Language (WSDL, discovered through Universal Description, Discovery and Integration (UDDI and communicate by the Simple Object Access Protocol (SOAP. Such a divination has never been fully accomplished yet. Although it was criticized that WSDL only has a syntactic definition of web services, but was not semantic, prior initiatives in semantic web services did not establish a correct methodology to resolve the problem. This paper examines the distinction and relationship between the syntactic and semantic definitions for web services that characterize different purposes in service computation. Further, this paper proposes that the semantics of web service are neutral and independent from the service interface definition, data types and platform. Such a conclusion can be a universal law in software engineering and service computing. Several use cases in the GIScience application are examined in this paper, while the formalization of geospatial services needs to be constructed by the GIScience community towards a comprehensive ontology of the conceptual definitions and relationships for geospatial computation. Advancements in semantic web services research will happen in domain science applications.

  1. Web Service Description and Discovery Based on Semantic Model

    Institute of Scientific and Technical Information of China (English)

    YANG Xuemei; XU Lizhen; DONG Yisheng; WANG Yongli

    2006-01-01

    A novel semantic model of Web service description and discovery was proposed through an extension for profile model of Web ontology language for services (OWL-S) in this paper.Similarity matching of Web services was implemented through computing weighted summation of semantic similarity value based on specific domain ontology and dynamical satisfy extent evaluation for quality of service (QoS).Experiments show that the provided semantic matching model is efficient.

  2. UkrVO astronomical WEB services

    Science.gov (United States)

    Mazhaev, O. E.

    2017-02-01

    Ukraine Virtual Observatory (UkrVO) has been a member of the International Virtual Observatory Alliance (IVOA) since 2011. The virtual observatory (VO) is not a magic solution to all problems of data storing and processing, but it provides certain standards for building infrastructure of astronomical data center. The astronomical databases help data mining and offer to users an easy access to observation metadata, images within celestial sphere and results of image processing. The astronomical web services (AWS) of UkrVO give to users handy tools for data selection from large astronomical catalogues for a relatively small region of interest in the sky. Examples of the AWS usage are showed.

  3. Consistency Checking of Web Service Contracts

    DEFF Research Database (Denmark)

    Cambronero, M. Emilia; Okika, Joseph C.; Ravn, Anders Peter

    2008-01-01

    Behavioural properties are analyzed for web service contracts formulated in Business Process Execution Language (BPEL) and Choreography Description Language (CDL). The key result reported is an automated technique to check consistency between protocol aspects of the contracts. The contracts...... are abstracted to (timed) automata and from there a simulation is set up, which is checked using automated tools for analyzing networks of finite state processes. Here we use the Concurrency Work Bench. The proposed techniques are illustrated with a case study that include otherwise difficult to analyze fault...

  4. Web Services as Public Services: Are We Supporting Our Busiest Service Point?

    Science.gov (United States)

    Riley-Huff, Debra A.

    2009-01-01

    This article is an analysis of academic library organizational culture, patterns, and processes as they relate to Web services. Data gathered in a research survey is examined in an attempt to reveal current departmental and administrative attitudes, practices, and support for Web services in the library research environment. (Contains 10 tables.)

  5. Building a biomedical ontology recommender web service.

    Science.gov (United States)

    Jonquet, Clement; Musen, Mark A; Shah, Nigam H

    2010-06-22

    Researchers in biomedical informatics use ontologies and terminologies to annotate their data in order to facilitate data integration and translational discoveries. As the use of ontologies for annotation of biomedical datasets has risen, a common challenge is to identify ontologies that are best suited to annotating specific datasets. The number and variety of biomedical ontologies is large, and it is cumbersome for a researcher to figure out which ontology to use. We present the Biomedical Ontology Recommender web service. The system uses textual metadata or a set of keywords describing a domain of interest and suggests appropriate ontologies for annotating or representing the data. The service makes a decision based on three criteria. The first one is coverage, or the ontologies that provide most terms covering the input text. The second is connectivity, or the ontologies that are most often mapped to by other ontologies. The final criterion is size, or the number of concepts in the ontologies. The service scores the ontologies as a function of scores of the annotations created using the National Center for Biomedical Ontology (NCBO) Annotator web service. We used all the ontologies from the UMLS Metathesaurus and the NCBO BioPortal. We compare and contrast our Recommender by an exhaustive functional comparison to previously published efforts. We evaluate and discuss the results of several recommendation heuristics in the context of three real world use cases. The best recommendations heuristics, rated 'very relevant' by expert evaluators, are the ones based on coverage and connectivity criteria. The Recommender service (alpha version) is available to the community and is embedded into BioPortal.

  6. Multi- Layer Tree Hierarchical Architecture Based on Web Service

    Institute of Scientific and Technical Information of China (English)

    TONG Hengjian; LI Deren; ZHU Xinyan; SHAO Zhenfeng

    2006-01-01

    To solve the problem of the information share and services integration in population information system, we propose a multi-layer tree hierarchical architecture. The com mand (Web Service Call) is recursively multicast from top layer of tree to bottom layer of tree and statistical data are gathered from bottom layer to top layer. We implemented the architecture by using Web Services technology. In our implementation, client program is the requestor of Web Services,and all leaf nodes of the last layer are only the provider of Web Services. For those nodes of intermediate layers, every node is not only the provider of Web Services, but also the dispatcher of Web Services. We take population census as an example to describe the working flow of the architecture.

  7. Constraints-Aware Scheduling for Transactional Services Composition

    Institute of Scientific and Technical Information of China (English)

    An Liu; Hai Liu; Qing Li; Liu-Sheng Huang; Ming-Jun Xiao

    2009-01-01

    Composite Web services need transactional support to guarantee their consistent and reliable execution. Due to the long running and inter-organizational characteristics of Web services, current approaches for transactional Web services composition adopt compensation mechanism to maintain atomicity. A common assumption is that a compensation operation can be applied at any time with no cost. However, compensation operations are typically associated with temporal and cost constraints, which make compensation mechanism problematic in this new environment. To address this problem, we distinguish two types of scheduling for transactional Web services composition: time aware scheduling and cost aware scheduling. We devise several algorithms for scheduling, which can ensure the atomicity of composite services when compensation operations have temporal constraints, and assist composite services to maintain atomicity with minimum compensation cost when compensation operations have cost constraints. We benchmark our algorithms by simulations and the results show that our algorithm decreases the compensation cost and in turn improves the QoS of transactional services composition.

  8. Business and scientific workflows a web service-oriented approach

    CERN Document Server

    Tan, Wei

    2013-01-01

    Focuses on how to use web service computing and service-based workflow technologies to develop timely, effective workflows for both business and scientific fields Utilizing web computing and Service-Oriented Architecture (SOA), Business and Scientific Workflows: A Web Service-Oriented Approach focuses on how to design, analyze, and deploy web service-based workflows for both business and scientific applications in many areas of healthcare and biomedicine. It also discusses and presents the recent research and development results. This informative reference features app

  9. Industrial TCP/IP Services Monitoring through Embedded Web Services

    Directory of Open Access Journals (Sweden)

    Francisco Maciá-Pérez

    2007-12-01

    Full Text Available The amount of IT devices and services incorporated in the industrial environment has led to the need to design mechanisms that will ensure its correct operation and minimise stoppage times. This paper proposes a system based on service-oriented architectures that allows the correct operation and monitoring of the applications and services running in this type of production elements. The main component of the system is a reduced size network device—that we have named eNSM device—in which the monitoring function proposed has been embedded as a web service. The whole system is based on a distributed application whose components are software agents. In addition, an application protocol named NSMP has been defined for communication between these agents.

  10. OGC Web Services standards by example : the European Seismic Portal

    Science.gov (United States)

    Frobert, L.; Kamb, L.; Trani, L.; Spinuso, A.; Bossu, R.; Van Eck, T.

    2011-12-01

    NERIES (2006-2010) was an Integrated Infrastructure Initiative (I3) project in the Sixth Framework Program (FP6) of the European Commission (EC), aiming at networking the European seismic networks, improving access to data, allowing access to specific seismic infrastructures and pursuing targeted research developing the next generation of tools for improved service and data analysis. During this project, a web portal was developed using web services to access data and a Visual Web Applications to display them. However these web services were not conform to any standard, making them difficult to consume by any new user interface. Therefore, for the NERA project, the follow-up of NERIES, we have proposed the use of web services standards to access our data. We have decided to use standards defined by the Open Geospatial Consortium (OGC). The OGC defines standards for the Web service interfaces to access geo-tagged data. The events and seismic stations are also geo-tagged making these web services suitable for our purpose. Using standard web services gives us the opportunity to distribute our data across all conformant consumers to these standards through various programming languages and applications We have implemented a preliminary version of web services conforming to the Web Map Service (WMS) and Web Feature Service (WFS) standard to access our catalog of seismic events (nearly 200 000 events). To visualize them we have made four examples demo on our web site using different technologies (Adobe Flash, JavaScript, Java with Nasa World Wind and UDig a desktop GIS application). In the future we hope to implement other OGC Web services standard like : - Sensor Observation Service (SOS) to provide seismic waveform records; - Web Notification Service (WNS); - Catalog Service for the Web (CSW) to provide a search engine of all our web services; - Web Processing Service (WPS) to process data between different services. The power of the use of OGC standards is the easy

  11. A web services choreography scenario for interoperating bioinformatics applications

    Directory of Open Access Journals (Sweden)

    Cheung David W

    2004-03-01

    Full Text Available Abstract Background Very often genome-wide data analysis requires the interoperation of multiple databases and analytic tools. A large number of genome databases and bioinformatics applications are available through the web, but it is difficult to automate interoperation because: 1 the platforms on which the applications run are heterogeneous, 2 their web interface is not machine-friendly, 3 they use a non-standard format for data input and output, 4 they do not exploit standards to define application interface and message exchange, and 5 existing protocols for remote messaging are often not firewall-friendly. To overcome these issues, web services have emerged as a standard XML-based model for message exchange between heterogeneous applications. Web services engines have been developed to manage the configuration and execution of a web services workflow. Results To demonstrate the benefit of using web services over traditional web interfaces, we compare the two implementations of HAPI, a gene expression analysis utility developed by the University of California San Diego (UCSD that allows visual characterization of groups or clusters of genes based on the biomedical literature. This utility takes a set of microarray spot IDs as input and outputs a hierarchy of MeSH Keywords that correlates to the input and is grouped by Medical Subject Heading (MeSH category. While the HTML output is easy for humans to visualize, it is difficult for computer applications to interpret semantically. To facilitate the capability of machine processing, we have created a workflow of three web services that replicates the HAPI functionality. These web services use document-style messages, which means that messages are encoded in an XML-based format. We compared three approaches to the implementation of an XML-based workflow: a hard coded Java application, Collaxa BPEL Server and Taverna Workbench. The Java program functions as a web services engine and interoperates

  12. A web services choreography scenario for interoperating bioinformatics applications

    Science.gov (United States)

    de Knikker, Remko; Guo, Youjun; Li, Jin-long; Kwan, Albert KH; Yip, Kevin Y; Cheung, David W; Cheung, Kei-Hoi

    2004-01-01

    Background Very often genome-wide data analysis requires the interoperation of multiple databases and analytic tools. A large number of genome databases and bioinformatics applications are available through the web, but it is difficult to automate interoperation because: 1) the platforms on which the applications run are heterogeneous, 2) their web interface is not machine-friendly, 3) they use a non-standard format for data input and output, 4) they do not exploit standards to define application interface and message exchange, and 5) existing protocols for remote messaging are often not firewall-friendly. To overcome these issues, web services have emerged as a standard XML-based model for message exchange between heterogeneous applications. Web services engines have been developed to manage the configuration and execution of a web services workflow. Results To demonstrate the benefit of using web services over traditional web interfaces, we compare the two implementations of HAPI, a gene expression analysis utility developed by the University of California San Diego (UCSD) that allows visual characterization of groups or clusters of genes based on the biomedical literature. This utility takes a set of microarray spot IDs as input and outputs a hierarchy of MeSH Keywords that correlates to the input and is grouped by Medical Subject Heading (MeSH) category. While the HTML output is easy for humans to visualize, it is difficult for computer applications to interpret semantically. To facilitate the capability of machine processing, we have created a workflow of three web services that replicates the HAPI functionality. These web services use document-style messages, which means that messages are encoded in an XML-based format. We compared three approaches to the implementation of an XML-based workflow: a hard coded Java application, Collaxa BPEL Server and Taverna Workbench. The Java program functions as a web services engine and interoperates with these web

  13. Creating OGC Web Processing Service workflows using a web-based editor

    Science.gov (United States)

    de Jesus, J.; Walker, P.; Grant, M.

    2012-04-01

    The OGC WPS (Web Processing Service) specifies how geospatial algorithms may be accessed in an SOA (Service Oriented Architecture). Service providers can encode both simple and sophisticated algorithms as WPS processes and publish them as web services. These services are not only useful individually but may be built into complex processing chains (workflows) that can solve complex data analysis and/or scientific problems. The NETMAR project has extended the Web Processing Service (WPS) framework to provide transparent integration between it and the commonly used WSDL (Web Service Description Language) that describes the web services and its default SOAP (Simple Object Access Protocol) binding. The extensions allow WPS services to be orchestrated using commonly used tools (in this case Taverna Workbench, but BPEL based systems would also be an option). We have also developed a WebGUI service editor, based on HTML5 and the WireIt! Javascript API, that allows users to create these workflows using only a web browser. The editor is coded entirely in Javascript and performs all XSLT transformations needed to produce a Taverna compatible (T2FLOW) workflow description which can be exported and run on a local Taverna Workbench or uploaded to a web-based orchestration server and run there. Here we present the NETMAR WebGUI service chain editor and discuss the problems associated with the development of a WebGUI for scientific workflow editing; content transformation into the Taverna orchestration language (T2FLOW/SCUFL); final orchestration in the Taverna engine and how to deal with the large volumes of data being transferred between different WPS services (possibly running on different servers) during workflow orchestration. We will also demonstrate using the WebGUI for creating a simple workflow making use of published web processing services, showing how simple services may be chained together to produce outputs that would previously have required a GIS (Geographic

  14. Persistence and availability of Web services in computational biology.

    Directory of Open Access Journals (Sweden)

    Sebastian J Schultheiss

    Full Text Available We have conducted a study on the long-term availability of bioinformatics Web services: an observation of 927 Web services published in the annual Nucleic Acids Research Web Server Issues between 2003 and 2009. We found that 72% of Web sites are still available at the published addresses, only 9% of services are completely unavailable. Older addresses often redirect to new pages. We checked the functionality of all available services: for 33%, we could not test functionality because there was no example data or a related problem; 13% were truly no longer working as expected; we could positively confirm functionality only for 45% of all services. Additionally, we conducted a survey among 872 Web Server Issue corresponding authors; 274 replied. 78% of all respondents indicate their services have been developed solely by students and researchers without a permanent position. Consequently, these services are in danger of falling into disrepair after the original developers move to another institution, and indeed, for 24% of services, there is no plan for maintenance, according to the respondents. We introduce a Web service quality scoring system that correlates with the number of citations: services with a high score are cited 1.8 times more often than low-scoring services. We have identified key characteristics that are predictive of a service's survival, providing reviewers, editors, and Web service developers with the means to assess or improve Web services. A Web service conforming to these criteria receives more citations and provides more reliable service for its users. The most effective way of ensuring continued access to a service is a persistent Web address, offered either by the publishing journal, or created on the authors' own initiative, for example at http://bioweb.me. The community would benefit the most from a policy requiring any source code needed to reproduce results to be deposited in a public repository.

  15. Feature-based engineering of compensations in web service environment

    DEFF Research Database (Denmark)

    Schaefer, Michael; Dolog, Peter

    2009-01-01

    In this paper, we introduce a product line approach for developing Web services with extended compensation capabilities. We adopt a feature modelling approach in order to describe variable and common compensation properties of Web service variants, as well as service consumer application...

  16. UJI PERFORMANSI OPENPGP PADA KOMUNIKASI DATA WEB SERVICE BERBASIS RESTFULL

    Directory of Open Access Journals (Sweden)

    Muhammad Zaien

    2016-04-01

    Full Text Available The exchange of data in distributed systems that communicate using Web Service must happen , so that sensitive data will also be redeemed. Sensitive data is supposed to be secret , but when the data is transferred using a Web Service can be known, so OpenPGP encryption used to maintain the confidentiality of the data. Securing the transfer of data to using the OpenPGP encryption standard may have an impact on the performance of Web Service response time and durability in the server serving the request , so need to known the impact with testing and analysis of variance on test results . Implementation of OpenPGP to secure the transfer of data on Web Service resulting in increased response time of Web Service but the response time can still be tolerated , and this application does not significantly affect the resilience of the server serving the request . Keywords: Web Service , RESTful, OpenPGP, Security Pertukaran data pada sistem tersebar yang berkomunikasi menggunakan Web Service pasti terjadi, sehingga data yang bersifat sensitif pun juga akan ditukarkan. Data yang bersifat sensitif ini seharusnya dirahasiakan tetapi ketika ditransfer menggunakan Web Service data tersebut dapat diketahui. Sehingga diterapkan OpenPGP untuk menjaga kerahasiaan data. Pengamanan transfer data menerapkan standar enkripsi OpenPGP dapat berdampak pada performa waktu response Web Service dan ketahanan server dalam melayani request, sehingga perlu diketahui dampak tersebut dengan melakukan pengujian dan analisis varian dari hasil pengujian. Penerapan OpenPGP untuk mengamankan transfer data pada Web Service mengakibatkan bertambahnya waktu response Web Service tetapi waktu response tersebut masih dapat ditoleransi, dan penerapan ini tidak mempengaruhi secara signifikan terhadap ketahanan server dalam melayani request. Kata kunci: Web Service , RESTful, OpenPGP, Keamanan

  17. Web Services and Their Use in Starlink Software

    Science.gov (United States)

    Taylor, M.; Platon, R.; Chipperfield, A.; Draper, P.; McIlwrath, B.; Giaretta, D.

    Web Services are gaining great popularity in the Grid community, and with good reason. The Starlink project is adopting Web Services as the method of interapplication communication. This is being done natively in new Java-based applications while older applications are being wrapped to provide Web Service interfaces. We are in this way providing interoperability between the generations of software in a heterogeneous, distributed manner and allowing the software to be usable in a distributed environment such as the GRID.

  18. On Web Services Based Cloud Interoperability

    Directory of Open Access Journals (Sweden)

    Reeta Sony A.L

    2012-09-01

    Full Text Available Cloud Computing is a paradigm shift in the field of Computing. It is moving at an incredible fast pace and one of the fastest evolving domains of computer science today. It consist set of technology and service models that concentrates on the internet base use and delivery of IT applications, processing capability, storage and memory space. There is a shift from the traditional in-house servers and applications to the next generation of cloud computing applications. With many of the computer giants like Google, Microsoft, etc. entering into the cloud computing arena, there will be thousands of applications running on the cloud. There are several cloud environments available in the market today which support a huge consumer-base. Eventually this will lead to a multitude of standards, technologies and products being provided on the cloud. Consumers will need certain degrees of flexibility to use the cloud application/services of their choice and at the same time will need these applications/services to communicate with each other. This paper emphasizes cloud computing and provides a solution to achieve Interoperability, which is in the form of Web Services. The paper will also provide a Live Case Study where interoperability comes into play - Connecting Google App Engine and Microsoft Windows Azure Platform, two of the leading Cloud Platforms available today. GAE and WAP are two Cloud Frameworks which have very little in common, making interoperability an absolute necessary.

  19. Software Architecture Design of GIS Web Service Aggregation Based on Service Group

    Science.gov (United States)

    Liu, J.-C.; Yang, J.; Tan, M.-J.; Gan, Q.

    2011-08-01

    Based on the analysis of research status of domestic and international GIS web service aggregation and development tendency of public platform of GIS web service, the paper designed software architecture of GIS web service aggregation based on GIS web service group. Firstly, using heterogeneous GIS services model, the software architecture converted a variety of heterogeneous services to a unified interface of GIS services, and divided different types of GIS services into different service groups referring to description of GIS services. Secondly, a service aggregation process model was designed. This model completed the task of specific service aggregation instance, by automatically selecting member GIS Web services in the same service group. Dynamic capabilities and automatic adaptation of GIS Web services aggregation process were achieved. Thirdly, this paper designed a service evaluation model of GIS web service aggregation based on service group from three aspects, i.e. GIS Web Service itself, networking conditions and service consumer. This model implemented effective quality evaluation and performance monitoring of GIS web service aggregation. It could be used to guide the execution, monitor and service selection of aggregation process. Therefore, robustness of aggregated GIS web service was improved. Finally, the software architecture has been widely used in public platform of GIS web service and a number of geo-spatial framework constructions for digital city in Sichuan Province, and aggregated various GIS web services such as World Map(National Public Platform of Geo-spatial Service), ArcGIS, SuperMap, MapGIS, NewMap etc. Applications of items showed that this software architecture was practicability.

  20. A Mediation Framework for Mobile Web Service Provisioning

    CERN Document Server

    Srirama, Satish Narayana; Prinz, Wolfgang; 10.1109/EDOCW.2006.9

    2010-01-01

    Web Services and mobile data services are the newest trends in information systems engineering in wired and wireless domains, respectively. Web Services have a broad range of service distributions while mobile phones have large and expanding user base. To address the confluence of Web Services and pervasive mobile devices and communication environments, a basic mobile Web Service provider was developed for smart phones. The performance of this Mobile Host was also analyzed in detail. Further analysis of the Mobile Host to provide proper QoS and to check Mobile Host's feasibility in the P2P networks, identified the necessity of a mediation framework. The paper describes the research conducted with the Mobile Host, identifies the tasks of the mediation framework and then discusses the feasible realization details of such a mobile Web Services mediation framework.

  1. Analysis of Trust-Based Approaches for Web Service Selection

    DEFF Research Database (Denmark)

    Dragoni, Nicola; Miotto, Nicola

    2011-01-01

    The basic tenet of Service-Oriented Computing (SOC) is the possibility of building distributed applications on the Web by using Web services as fundamental building blocks. The proliferation of such services is considered the second wave of evolution in the Internet age, moving the Web from...... a collection of pages to a collections of services. Consensus is growing that this Web service revolution wont eventuate until we resolve trust-related issues. Indeed, the intrinsic openness of the SOC vision makes crucial to locate useful services and recognize them as trustworthy. In this paper we review...... the field of trust-based Web service selection, providing a structured classification of current approaches and highlighting the main limitations of each class and of the overall field....

  2. Web Service Assurance: The Notion and the Issues

    Directory of Open Access Journals (Sweden)

    Atousa Pahlevan

    2012-02-01

    Full Text Available Web service technology provides basic infrastructure for deploying collaborative business processes. Web Service security standards and protocols aim to provide secure communication and conversation between service providers and consumers. Still, for a client calling a Web service it is difficult to ascertain that a particular service instance satisfies—at execution time—specific non-functional properties. In this paper we introduce the notion of certified Web service assurance, characterizing how service consumers can specify the set of security properties that a service should satisfy. Also, we illustrate a mechanism to re-check non-functional properties when the execution context changes. To this end, we introduce the concept of context-aware certificate, and describe a dynamic, context-aware service discovery environment.

  3. Web-Based Course Management and Web Services

    Science.gov (United States)

    Mandal, Chittaranjan; Sinha, Vijay Luxmi; Reade, Christopher M. P.

    2004-01-01

    The architecture of a web-based course management tool that has been developed at IIT [Indian Institute of Technology], Kharagpur and which manages the submission of assignments is discussed. Both the distributed architecture used for data storage and the client-server architecture supporting the web interface are described. Further developments…

  4. SIDECACHE: Information access, management and dissemination framework for web services

    Directory of Open Access Journals (Sweden)

    Robbins Kay A

    2011-06-01

    Full Text Available Abstract Background Many bioinformatics algorithms and data sets are deployed using web services so that the results can be explored via the Internet and easily integrated into other tools and services. These services often include data from other sites that is accessed either dynamically or through file downloads. Developers of these services face several problems because of the dynamic nature of the information from the upstream services. Many publicly available repositories of bioinformatics data frequently update their information. When such an update occurs, the developers of the downstream service may also need to update. For file downloads, this process is typically performed manually followed by web service restart. Requests for information obtained by dynamic access of upstream sources is sometimes subject to rate restrictions. Findings SideCache provides a framework for deploying web services that integrate information extracted from other databases and from web sources that are periodically updated. This situation occurs frequently in biotechnology where new information is being continuously generated and the latest information is important. SideCache provides several types of services including proxy access and rate control, local caching, and automatic web service updating. Conclusions We have used the SideCache framework to automate the deployment and updating of a number of bioinformatics web services and tools that extract information from remote primary sources such as NCBI, NCIBI, and Ensembl. The SideCache framework also has been used to share research results through the use of a SideCache derived web service.

  5. BioSWR--semantic web services registry for bioinformatics.

    Directory of Open Access Journals (Sweden)

    Dmitry Repchevsky

    Full Text Available Despite of the variety of available Web services registries specially aimed at Life Sciences, their scope is usually restricted to a limited set of well-defined types of services. While dedicated registries are generally tied to a particular format, general-purpose ones are more adherent to standards and usually rely on Web Service Definition Language (WSDL. Although WSDL is quite flexible to support common Web services types, its lack of semantic expressiveness led to various initiatives to describe Web services via ontology languages. Nevertheless, WSDL 2.0 descriptions gained a standard representation based on Web Ontology Language (OWL. BioSWR is a novel Web services registry that provides standard Resource Description Framework (RDF based Web services descriptions along with the traditional WSDL based ones. The registry provides Web-based interface for Web services registration, querying and annotation, and is also accessible programmatically via Representational State Transfer (REST API or using a SPARQL Protocol and RDF Query Language. BioSWR server is located at http://inb.bsc.es/BioSWR/and its code is available at https://sourceforge.net/projects/bioswr/under the LGPL license.

  6. Testing Metadata Existence of Web Map Services

    Directory of Open Access Journals (Sweden)

    Jan Růžička

    2011-05-01

    Full Text Available For a general user is quite common to use data sources available on WWW. Almost all GIS software allow to use data sources available via Web Map Service (ISO/OGC standard interface. The opportunity to use different sources and combine them brings a lot of problems that were discussed many times on conferences or journal papers. One of the problem is based on non existence of metadata for published sources. The question was: were the discussions effective? The article is partly based on comparison of situation for metadata between years 2007 and 2010. Second part of the article is focused only on 2010 year situation. The paper is created in a context of research of intelligent map systems, that can be used for an automatic or a semi-automatic map creation or a map evaluation.

  7. Web Services-Based Test Report Generation

    Institute of Scientific and Technical Information of China (English)

    LUO Ling; BAI Xiaoying

    2005-01-01

    Tests involving a large number of test cases and test scenarios are always time- and effort-intensive, and use ad hoc approaches. Test management is needed to control the complexity and the quality of the testing of large software systems. The reporting mechanism is critical for monitoring the testing progress, analyzing test results, and evaluating the test effectiveness for a disciplined testing process throughout the testing lifecycle. This paper presents an XML-based report generation method for large system testing. The service-oriented architecture enables flexible test report generation, presentation, and exchange to facilitate collaboration in a distributed environment. The results show that proper reporting can effectively improve the visibility of the testing process and that this web-based approach is critical to enhance communication among multiple testing groups.

  8. WEB SERVICE SELECTION ALGORITHM BASED ON PRINCIPAL COMPONENT ANALYSIS

    Institute of Scientific and Technical Information of China (English)

    Kang Guosheng; Liu Jianxun; Tang Mingdong; Cao Buqing

    2013-01-01

    Existing Web service selection approaches usually assume that preferences of users have been provided in a quantitative form by users.However,due to the subjectivity and vagueness of preferences,it may be impractical for users to specify quantitative and exact preferences.Moreover,due to that Quality of Service (QoS) attributes are often interrelated,existing Web service selection approaches which employ weighted summation of QoS attribute values to compute the overall QoS of Web services may produce inaccurate results,since they do not take correlations among QoS attributes into account.To resolve these problems,a Web service selection framework considering user's preference priority is proposed,which incorporates a searching mechanism with QoS range setting to identify services satisfying the user's QoS constraints.With the identified service candidates,based on the idea of Principal Component Analysis (PCA),an algorithm of Web service selection named PCAoWSS (Web Service Selection based on PCA) is proposed,which can eliminate the correlations among QoS attributes and compute the overall QoS of Web services accurately.After computing the overall QoS for each service,the algorithm ranks the Web service candidates based on their overall QoS and recommends services with top QoS values to users.Finally,the effectiveness and feasibility of our approach are validated by experiments,i.e.the selected Web service by our approach is given high average evaluation than other ones by users and the time cost of PCA-WSS algorithm is not affected acutely by the number of service candidates.

  9. Web services for distributed and interoperable hydro-information systems

    Science.gov (United States)

    Horak, J.; Orlik, A.; Stromsky, J.

    2008-03-01

    Web services support the integration and interoperability of Web-based applications and enable machine-to-machine interaction. The concepts of web services and open distributed architecture were applied to the development of T-DSS, the prototype customised for web based hydro-information systems. T-DSS provides mapping services, database related services and access to remote components, with special emphasis placed on the output flexibility (e.g. multilingualism), where SOAP web services are mainly used for communication. The remote components are represented above all by remote data and mapping services (e.g. meteorological predictions), modelling and analytical systems (currently HEC-HMS, MODFLOW and additional utilities), which support decision making in water management.

  10. Web services for distributed and interoperable hydro-information systems

    Directory of Open Access Journals (Sweden)

    J. Horak

    2008-03-01

    Full Text Available Web services support the integration and interoperability of Web-based applications and enable machine-to-machine interaction. The concepts of web services and open distributed architecture were applied to the development of T-DSS, the prototype customised for web based hydro-information systems. T-DSS provides mapping services, database related services and access to remote components, with special emphasis placed on the output flexibility (e.g. multilingualism, where SOAP web services are mainly used for communication. The remote components are represented above all by remote data and mapping services (e.g. meteorological predictions, modelling and analytical systems (currently HEC-HMS, MODFLOW and additional utilities, which support decision making in water management.

  11. Web services for distributed and interoperable hydro-information systems

    Directory of Open Access Journals (Sweden)

    J. Horak

    2007-06-01

    Full Text Available Web services support the integration and interoperability of Web-based applications and enable machine-to-machine interaction. The concepts of web services and open distributed architecture were applied to the development of T-DSS, the prototype customised for web based hydro-information systems. T-DSS provides mapping services, database related services and access to remote components, with special emphasis placed on output flexibility (e.g. multilingualism, where SOAP web services are mainly used for communication. The remote components are represented above all by distant data and mapping services (e.g. eteorological predictions, modelling and analytical systems (currently HEC-HMS, Modflow and additional utilities, which support decision making in water management.

  12. Toward a Unified Framework for Web Service Trustworthiness

    DEFF Research Database (Denmark)

    Miotto, N.; Dragoni, Nicola

    2012-01-01

    The intrinsic openness of the Service-Oriented Computing vision makes crucial to locate useful services and recognize them as trustworthy. What does it mean that a Web service is trustworthy? How can a software agent evaluate the trustworthiness of a Web service? In this paper we present an ongoing...... research aiming at providing an answer to these key issues to realize this vision. In particular, starting from an analysis of the weaknesses of current approaches, we discuss the possibility of a unified framework for Web service trustworthiness. The founding principle of our novel framework is that “hard...

  13. Histories of Public Service Broadcasters on the Web

    DEFF Research Database (Denmark)

    This edited volume details multiple and dynamic histories of relations between public service broadcasters and the World Wide Web. What does it mean to be a national broadcaster in a global communications environment? What are the commercial and public service pressures that were brought to bear...... when public service broadcasters implemented web services? How did “one- to-many” broadcasters adapt to the “many-to-many” medium of the internet? The thematic or- ganisation of this collection addresses such major issues, while each chapter offers a particular historical account of relations between...... public service broadcasters and the World Wide Web....

  14. Optimizing medical data quality based on multiagent web service framework.

    Science.gov (United States)

    Wu, Ching-Seh; Khoury, Ibrahim; Shah, Hemant

    2012-07-01

    One of the most important issues in e-healthcare information systems is to optimize the medical data quality extracted from distributed and heterogeneous environments, which can extremely improve diagnostic and treatment decision making. This paper proposes a multiagent web service framework based on service-oriented architecture for the optimization of medical data quality in the e-healthcare information system. Based on the design of the multiagent web service framework, an evolutionary algorithm (EA) for the dynamic optimization of the medical data quality is proposed. The framework consists of two main components; first, an EA will be used to dynamically optimize the composition of medical processes into optimal task sequence according to specific quality attributes. Second, a multiagent framework will be proposed to discover, monitor, and report any inconstancy between the optimized task sequence and the actual medical records. To demonstrate the proposed framework, experimental results for a breast cancer case study are provided. Furthermore, to show the unique performance of our algorithm, a comparison with other works in the literature review will be presented.

  15. Contracts for Abstract Processes in Service Composition

    Directory of Open Access Journals (Sweden)

    Maria Grazia Buscemi

    2011-01-01

    Full Text Available Contracts are a well-established approach for describing and analyzing behavioral aspects of web service compositions. The theory of contracts comes equipped with a notion of compatibility between clients and servers that ensures that every possible interaction between compatible clients and servers will complete successfully. It is generally agreed that real applications often require the ability of exposing just partial descriptions of their behaviors, which are usually known as abstract processes. We propose a formal characterization of abstraction as an extension of the usual symbolic bisimulation and we recover the notion of abstraction in the context of contracts.

  16. Krishi-Services-Web Services Based solution for agricultural issues

    Directory of Open Access Journals (Sweden)

    Deepanshi Garg

    2013-06-01

    Full Text Available Web Service is an emerging technology for the agricultural field to improve crop productivity in aspect of quality and quantity. India is known as an agricultural country and majority of Indian population lives in rural areas. The Indian Farmers are facing a lot of difficulties to increase production of crops. Now a day lots ofresearch has been done in this area, but still farmers are unable to achieve upper-bound yield due to lack of knowledge about this research. So to overcome this problem we are proposing a novel framework that is “Krishi-Services” to make various services and information available at their door steps. For the development of country and the betterment of rural people in the remote area, we are using information technology to collect information from various online sources and thereby making farmers aware of recent technologies.

  17. A Heuristic Approach for Web-Service Discovery and Selection

    OpenAIRE

    Achraf Karray; Rym Teyeb; Maher Ben Jemaa

    2013-01-01

    In today's businesses, service-oriented architectures represent the main paradigm for IT infrastructures. Indeed, the emergence of Internet made it possible to set up an exploitable environment to distribute applications on a large scale, and this, by adapting the notion of "service". With the integration of this paradigm in Business to Business Domain (B2B), the number of web services becomes very significant. Due to this increase, the discovery and selection of web services meeting customer...

  18. Investigating Soap and Xml Technologies in Web Service

    OpenAIRE

    Mehdi Zekriyapanah Gashti

    2012-01-01

    In this paper, Investigating SOAP and XML technologies in web service is studied. The reason for usingXML technology to transmit data and also the need for application of existing communicative structure inSOAP technology in web pages with WSDL technology are investigated uniquely. And also the need forsearchable address giving for web service which is available in UDDI technology and the advantages ofusing it are explained for programmers.

  19. VxBPEL : Supporting variability for Web services in BPEL

    NARCIS (Netherlands)

    Koning, Michiel; Sun, Chang-ai; Sinnema, Marco; Avgeriou, Paris

    2009-01-01

    Web services provide a way to facilitate the business integration over the Internet. Flexibility is an important and desirable property of Web service-based systems due to dynamic business environments. The flexibility can be provided or addressed by incorporating variability into a system. In this

  20. Research on the E-Learning Application of Web Service

    Institute of Scientific and Technical Information of China (English)

    FEI Chun; TANG Xue-fei

    2005-01-01

    This thesis introduces the e-learning system and Web Service technology. Then, it proposes how to apply Web Service technology to the e-learning system, and how to improve systematic flexibility and dependability. Finally it provides the basic framework of the system and a simple realization according to related specification.

  1. Web 2.0 Strategy in Libraries and Information Services

    Science.gov (United States)

    Byrne, Alex

    2008-01-01

    Web 2.0 challenges libraries to change from their predominantly centralised service models with integrated library management systems at the hub. Implementation of Web 2.0 technologies and the accompanying attitudinal shifts will demand reconceptualisation of the nature of library and information service around a dynamic, ever changing, networked,…

  2. Ad-Hoc Business Processes in Web Services

    NARCIS (Netherlands)

    Wombacher, Andreas; Mahleko, Bendick

    2003-01-01

    Web service technologies promise to facilitate collaboration among business partners by helping potential business partners find one another and integrate their business processes to do business. Daunting challenges however exist before the full potential of Web services can be realized. Indexing me

  3. Analysing scientific workflows: why workflows not only connect web services

    NARCIS (Netherlands)

    Wassink, I.; van der Vet, P.E.; Wolstencroft, K.; Neerincx, P.B.T.; Roos, M.; Rauwerda, H.; Breit, T.M.; Zhang, LJ.

    2009-01-01

    Life science workflow systems are developed to help life scientists to conveniently connect various programs and web services. In practice however, much time is spent on data conversion, because web services provided by different organisations use different data formats. We have analysed all the

  4. Analysing scientific workflows: Why workflows not only connect web services

    NARCIS (Netherlands)

    Wassink, I.; van der Vet, P.E.; Wolstencroft, K.; Neerincx, P.B.T.; Roos, M.; Rauwerda, H.; Breit, T.M.; Zhang, L.J.

    2009-01-01

    Life science workflow systems are developed to help life scientists to conveniently connect various programs and web services. In practice however, much time is spent on data conversion, because web services provided by different organisations use different data formats. We have analysed all the

  5. Ad-Hoc Business Processes in Web Services

    NARCIS (Netherlands)

    Wombacher, Andreas; Mahleko, Bendick

    2003-01-01

    Web service technologies promise to facilitate collaboration among business partners by helping potential business partners find one another and integrate their business processes to do business. Daunting challenges however exist before the full potential of Web services can be realized. Indexing me

  6. An Agile Method for E-Service Composition

    CERN Document Server

    Fatehi, Pouya

    2012-01-01

    Nowadays, application of Service Oriented Architecture is increasing rapidly; especially since introduction of distributed electronic services on the web. SOA software has a modular manner and works as a collaboration of independent software components. As a result, e-service approach is sufficient for software with independent components, each of which may be developed by a different company. Such software components and their cooperation form a composite service. Agile methodologies are the best candidate for developing small software components. Composite services and its building blocks are small pieces of software, making agile methodology a perfect fit for their development. In this paper, we introduce an agile method for service composition, inspired by agile patterns and practices. Therefore, across the agile manifesto, we can develop low cost, high quality composite services quickly using this method.

  7. An Agile Method for E-Service Composition

    Directory of Open Access Journals (Sweden)

    Pouya Fatehi

    2012-01-01

    Full Text Available Nowadays, application of Service Oriented Architecture is increasing rapidly; especially since introduction of distributed electronic services on the web. SOA software has a modular manner and works as a collaboration of independent software components. As a result, e-service approach is sufficient for software with independent components, each of which may be developed by a different company. Such software components and their cooperation form a composite service. Agile methodologies are the best candidate for developing small software components. Composite services and their building blocks are small pieces of software, making agile methodology a perfect fit for their development. In this paper, we introduce an agile method for service composition, inspired by agile patterns and practices. Therefore, across the agile manifesto, we can develop low cost, high quality composite services quickly using this method.

  8. Test Cases Reduction and Selection Optimization in Testing Web Services

    Directory of Open Access Journals (Sweden)

    Izzat Alsmadi

    2012-10-01

    Full Text Available Software testing in web services environment faces different challenges in comparison with testing in traditional software environments. Regression testing activities are triggered based on software changes or evolutions. In web services, evolution is not a choice for service clients. They have always to use the current updated version of the software. In addition test execution or invocation is expensive in web services and hence providing algorithms to optimize test case generation and execution is vital. In this environment, we proposed several approach for test cases’ selection in web services’ regression testing. Testing in this new environment should evolve to be included part of the service contract. Service providers should provide data or usage sessions that can help service clients reduce testing expenses through optimizing the selected and executed test cases.

  9. Web Service 技术研究

    Institute of Scientific and Technical Information of China (English)

    孙俊丽

    2016-01-01

    文章基于Web Service技术,首先介绍了发展背景,概述了Web Service的体系结构,分析了Web Service的工作原理,最后总结了Web Service的优点,为今后深入发展奠定了基础。

  10. Analysis Tool Web Services from the EMBL-EBI.

    Science.gov (United States)

    McWilliam, Hamish; Li, Weizhong; Uludag, Mahmut; Squizzato, Silvano; Park, Young Mi; Buso, Nicola; Cowley, Andrew Peter; Lopez, Rodrigo

    2013-07-01

    Since 2004 the European Bioinformatics Institute (EMBL-EBI) has provided access to a wide range of databases and analysis tools via Web Services interfaces. This comprises services to search across the databases available from the EMBL-EBI and to explore the network of cross-references present in the data (e.g. EB-eye), services to retrieve entry data in various data formats and to access the data in specific fields (e.g. dbfetch), and analysis tool services, for example, sequence similarity search (e.g. FASTA and NCBI BLAST), multiple sequence alignment (e.g. Clustal Omega and MUSCLE), pairwise sequence alignment and protein functional analysis (e.g. InterProScan and Phobius). The REST/SOAP Web Services (http://www.ebi.ac.uk/Tools/webservices/) interfaces to these databases and tools allow their integration into other tools, applications, web sites, pipeline processes and analytical workflows. To get users started using the Web Services, sample clients are provided covering a range of programming languages and popular Web Service tool kits, and a brief guide to Web Services technologies, including a set of tutorials, is available for those wishing to learn more and develop their own clients. Users of the Web Services are informed of improvements and updates via a range of methods.

  11. Enhancing the AliEn Web Service Authentication

    Science.gov (United States)

    Zhu, Jianlin; Saiz, Pablo; Carminati, Federico; Betev, Latchezar; Zhou, Daicui; Mendez Lorenzo, Patricia; Grigoras, Alina Gabriela; Grigoras, Costin; Furano, Fabrizio; Schreiner, Steffen; Vladimirovna Datskova, Olga; Sankar Banerjee, Subho; Zhang, Guoping

    2011-12-01

    Web Services are an XML based technology that allow applications to communicate with each other across disparate systems. Web Services are becoming the de facto standard that enable inter operability between heterogeneous processes and systems. AliEn2 is a grid environment based on web services. The AliEn2 services can be divided in three categories: Central services, deployed once per organization; Site services, deployed on each of the participating centers; Job Agents running on the worker nodes automatically. A security model to protect these services is essential for the whole system. Current implementations of web server, such as Apache, are not suitable to be used within the grid environment. Apache with the mod_ssl and OpenSSL only supports the X.509 certificates. But in the grid environment, the common credential is the proxy certificate for the purpose of providing restricted proxy and delegation. An Authentication framework was taken for AliEn2 web services to add the ability to accept X.509 certificates and proxy certificates from client-side to Apache Web Server. The authentication framework could also allow the generation of access control policies to limit access to the AliEn2 web services.

  12. Measuring Security of Web Services in Requirement Engineering Phase

    Directory of Open Access Journals (Sweden)

    Davoud Mougouei

    2015-05-01

    Full Text Available Addressing security in early stages of web service development has always been a major engineering trend. However, to assure security of web services it is required to perform security evaluation in a rigorous and tangible manner. The results of such an evaluation if performed in early stages of the development process can be used to improve the quality of the target web service. On the other hand, it is impossible to remove all of the security faults during the security analysis of web services. As a result, absolute security is never possible to achieve and a security failure may occur during the execution of web service. To avoid security failures, a measurable level of fault tolerance is required to be achieved through partial satisfaction of security goals. Thus any proposed measurement technique must care for this partiality. Even though there are some approaches toward assessing the security of web services but still there is no precise model for evaluation of security goal satisfaction specifically during the requirement engineering phase. This paper introduces a Security Measurement Model (SMM for evaluating the Degree of Security (DS in security requirements of web services by taking into consideration partial satisfaction of security goals. The proposed model evaluates overall security of the target service through measuring the security in Security Requirement Model (SRM of the service. The proposed SMM also takes into account cost, technical ability, impact and flexibility as the key features of security evaluation.

  13. Enhancing service discovery using cat swarm optimisation based web service clustering

    Directory of Open Access Journals (Sweden)

    Sunaina Kotekar

    2016-09-01

    Full Text Available Web service discovery is a critical task in service oriented application development. Due to extensive proliferation in the number of available services, it is challenging to obtain all the relevant services available for a given task. For the retrieval of most relevant Web services, a user would have to use those service-specific terms that best describe and match the natural language documentation contained within a service description. This process can be time intensive, due to functional diversity of available services in a repository. Domain specific clustering of Web Services based on the similarities of their functionalities would greatly boost the ability of a Web service search engine to retrieve the most relevant service. In this paper, we propose a novel technique to cluster service documents into functionally similar service groups using the Cat Swarm Optimisation Algorithm. We present experimental results that show that the proposed technique was effective and enhanced the process of service discovery.

  14. 基于HTML5、Ajax和Web Service的WebGIS研究%Research on WebGIS based on HTML5, Ajax and Web Service

    Institute of Scientific and Technical Information of China (English)

    徐卓揆

    2012-01-01

    为改变WebGIS中各种浏览嚣缺乏支持矢量数据的标准方法、数据互操作能力有限和空间分析功能较弱的现状,基于新一代HTML5标准、Ajax和Web Service技术,本文提出了开放式WebGIS模型,并开发了实验平台.该平台支持数据共享的Web Services和OGC新规范Web Processing Service,改善了现有WebGIS缺陷,提高了WebGIS的互操作及空间分析能力.%To amend the situation, including no standard for various browsers to support GIS vector data, limitation of GIS data interoperation and weak function of spatial analysis in WebGIS, based on new HTML5 atandard, Ajax and Web Service technologies,the paper put forward an open model of WebGIS, and an experimental platform was developed In this platform, Web Services for data interoperation and new OGC standard Web Processing Service were supported, the platform obviously amended the defects of WebGIS,and improved the abilities of interoperation and spatial analysis with WebGIS.

  15. 一种Web服务组合模型%A Model of Web Service Combination

    Institute of Scientific and Technical Information of China (English)

    崔凯; 彭晓明

    2011-01-01

    To meet the demand of Web service composition, this paper proposed a Web Services Composition Bus Model(WSCBM) based on bidding frame, service composition bus as the core, supporting "multi-agent", for dynamic Web service composition application scenes. Furthermore, to demonstrate the validity of the model and method, a prototype implementation and application in practical engineering of WSCBM is introduced.%为了满足Web服务组合的需要,提出了一种基于招标/投标框架,以服务组合总线为核心,支持"多代理",适用于动态Web服务组合的应用场景的Web服务组合总线模型(WSCBM:Web Services Composition Bus Model).为了验证该模型和方法的有效性,介绍了WSCBM的一种实现原型及其在实际工程中的应用.

  16. 一种面向语义Web的组合服务演化方法研究%Research on the Semantic Web Oriented Method for the Evolution of Composite Service

    Institute of Scientific and Technical Information of China (English)

    王晓璇; 鲍爱华; 缪嘉嘉; 丁科; 王真

    2011-01-01

    To adapt composite services with changes in dynamic environment agility and effectively,a semantic Web oriented method for the evolution of compo-site service which named EM4CS was proposed systematically. Taking composite services described by OWL-S as research object, EM4CS divides the evolution process into 3 parts,and covers the evolution cycle in 6 stages, i. e. evolution requirements capturing, formal representation of evolution requirements,syntactic consistency maintenance, semantic consistency maintenance, confirmation of evolution results, publication and broadcasting of evolution results. The composite service evolution process was analyzed from the perspective of system engineering, and the evolution requirements were fulfilled in an iterative refined way, in which the syntactic and semantic consistency were also maintained. The composite service evolution support system, which follows EM4CS, named ESS4CS,was also introduced in this paper. E SS4CS can assist knowledge engineer in the whole process of composite service evolution,and the efficiency and precision of the evolution process are also improved.%为了敏捷、有效地调整动态环境下的组合服务,系统地提出一种面向语义Web的组合服务结构化演化方法EM4CS.EM4CS方法采用OWL-S语言描述的组合式语义Web服务为研究对象,将组合服务演化过程划分为3个部分、6个阶段,分别从演化需求获取、演化需求形式化表示、语法一致性维护、语义一致性维护、演化结果确认和演化结果发布与传播6个方面覆盖组合服务演化周期.EM4CS方法从系统工程的角度分析组合服务演化过程,以迭代求精的方式逐步实现演化需求,同时维持服务描述语法和语义的一致性.介绍了遵循EM4CS方法的组合服务演化支撑系统ESS4CS,该系统能够全程辅助知识工程师完成组合服务演化工作,能有效地提高组合服务演化的效率和精度.

  17. 用SOAP Toolkit开发Web Service

    Institute of Scientific and Technical Information of China (English)

    姚彤

    2003-01-01

    1.Web Service简介 在目前的分布式的应用开发中,Web Service(Web服务,本文将统一采用Web Service,而不使用Web服务这个词)已经成为一个热点。Web Service简单的说就是部署在Web上的对象/组件,具有良好的封装性,对外提供定义良好的接口供

  18. Spatial Data Web Services Pricing Model Infrastructure

    Science.gov (United States)

    Ozmus, L.; Erkek, B.; Colak, S.; Cankurt, I.; Bakıcı, S.

    2013-08-01

    The General Directorate of Land Registry and Cadastre (TKGM) which is the leader in the field of cartography largely continues its missions which are; to keep and update land registry and cadastre system of the country under the responsibility of the treasure, to perform transactions related to real estate and to establish Turkish national spatial information system. TKGM a public agency has completed many projects. Such as; Continuously Operating GPS Reference Stations (TUSAGA-Aktif), Geo-Metadata Portal (HBB), Orthophoto-Base Map Production and web services, Completion of Initial Cadastre, Cadastral Renovation Project (TKMP), Land Registry and Cadastre Information System (TAKBIS), Turkish National Spatial Data Infrastructure Project (TNSDI), Ottoman Land Registry Archive Information System (TARBIS). TKGM provides updated map and map information to not only public institutions but also to related society in the name of social responsibility principals. Turkish National Spatial Data Infrastructure activities have been started by the motivation of Circular No. 2003/48 which was declared by Turkish Prime Ministry in 2003 within the context of e-Transformation of Turkey Short-term Action Plan. Action No. 47 in the mentioned action plan implies that "A Feasibility Study shall be made in order to establish the Turkish National Spatial Data Infrastructure" whose responsibility has been given to General Directorate of Land Registry and Cadastre. Feasibility report of NSDI has been completed in 10th of December 2010. After decision of Steering Committee, feasibility report has been send to Development Bank (old name State Planning Organization) for further evaluation. There are two main arrangements with related this project (feasibility report).First; Now there is only one Ministry which is Ministry of Environment and Urbanism responsible for establishment, operating and all national level activities of NSDI. And Second arrangement is related to institutional Level. The

  19. Building Assessment Web Service from Question Type Learning Objects

    OpenAIRE

    Reklaitis, Vytautas; Baniulis, Kazys; Aukstakalnis, Nerijus

    2004-01-01

    In this paper we discuss the TestTool system as an established testing system model, the one that is being used in real educational settings and supports self-assessment as well as testing learning practices. We then elaborate how this learning object-based system is being re-engineered and extended within the context of Web service oriented architecture. Testing Web service implementation along with considerations regarding how e-learning services from distributed Learning Objects could be c...

  20. Building Assessment Web Service from Question Type Learning Objects

    OpenAIRE

    Reklaitis, Vytautas; Baniulis, Kazys; Aukstakalnis, Nerijus

    2004-01-01

    In this paper we discuss the TestTool system as an established testing system model, the one that is being used in real educational settings and supports self-assessment as well as testing learning practices. We then elaborate how this learning object-based system is being re-engineered and extended within the context of Web service oriented architecture. Testing Web service implementation along with considerations regarding how e-learning services from distributed Learning Objects could be c...

  1. Rule-based semantic web services matching strategy

    Science.gov (United States)

    Fan, Hong; Wang, Zhihua

    2011-12-01

    With the development of Web services technology, the number of service increases rapidly, and it becomes a challenge task that how to efficiently discovery the services that exactly match the user's requirements from the large scale of services library. Many semantic Web services discovery technologies proposed by the recent literatures only focus on the keyword-based or primary semantic based service's matching. This paper studies the rules and rule reasoning based service matching algorithm in the background of large scale services library. Firstly, the formal descriptions of semantic web services and service matching is presented. The services' matching are divided into four levels: Exact, Plugin, Subsume and Fail and their formal descriptions are also presented. Then, the service matching is regarded as rule-based reasoning issues. A set of match rules are firstly given and the related services set is retrieved from services ontology base through rule-based reasoning, and their matching levels are determined by distinguishing the relationships between service's I/O and user's request I/O. Finally, the experiment based on two services sets show that the proposed services matching strategy can easily implement the smart service discovery and obtains the high service discovery efficiency in comparison with the traditional global traversal strategy.

  2. Public service improvement with user-centric service composition

    NARCIS (Netherlands)

    Hoppen dos Santos, Joni; Ferreira Pires, Luis; Goncalves da Silva, Eduardo; Iacob, Maria Eugenia; Janssen, M.; Macintosh, A.; Scholl, H.J.; Tambouris, E.; Wimmer, M.A.; de Bruijn, H.; Tan, Y.H

    2011-01-01

    In recent years, public organisations have been challenged to offer electronic services. This has caused a proliferation of disconnected web sites or web portals, often reflecting the internal structures (departments or sections) of these organizations. This paper shows that electronic public servic

  3. Web service reputation evaluation based on QoS measurement.

    Science.gov (United States)

    Zhang, Haiteng; Shao, Zhiqing; Zheng, Hong; Zhai, Jie

    2014-01-01

    In the early service transactions, quality of service (QoS) information was published by service provider which was not always true and credible. For better verification the trust of the QoS information was provided by the Web service. In this paper, the factual QoS running data are collected by our WS-QoS measurement tool; based on these objectivity data, an algorithm compares the difference of the offered and measured quality data of the service and gives the similarity, and then a reputation evaluation method computes the reputation level of the Web service based on the similarity. The initial implementation and experiment with three Web services' example show that this approach is feasible and these values can act as the references for subsequent consumers to select the service.

  4. Integrating GIS Web services based on mediating architecture

    Institute of Scientific and Technical Information of China (English)

    CHEN Guan-hua; HAN Liang; MA Xiu-jun; XIE Kun-qing; CHEN Zhuo

    2004-01-01

    The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.

  5. Linked-OWL: A new approach for dynamic linked data service workflow composition

    Directory of Open Access Journals (Sweden)

    Hussien Ahmad

    2013-06-01

    Full Text Available The shift from Web of Document into Web of Data based on Linked Data principles defined by Tim Berners-Lee posed a big challenge to build and develop applications to work in Web of Data environment. There are several attempts to build service and application models for Linked Data Cloud. In this paper, we propose a new service model for linked data "Linked-OWL" which is based on RESTful services and OWL-S and copes with linked data principles. This new model shifts the service concept from functions into linked data things and opens the road for Linked Oriented Architecture (LOA and Web of Services as part and on top of Web of Data. This model also provides high level of dynamic service composition capabilities for more accurate dynamic composition and execution of complex business processes in Web of Data environment.

  6. Towards structural Web Services matching based on Kernel methods

    Institute of Scientific and Technical Information of China (English)

    NAN Kai; YU Jianjun; SU Hao; GUO Shengmin; ZHANG Hui; XU Ke

    2007-01-01

    This paper describes a kernel methods based Web Services matching mechanism for Web Services discovery and integration.The matching mechanism tries to exploit the latent semantics by the structure of Web Services.In this paper,Web Services are schemed by WSDL(Web Services Description Language)as tree-structured XML documents,and their matching degree is calculated by our novel algorithm designed for loosely tree matching against the traditional methods.In order to achieve the task,we bring forward the concept of path subsequence to model WSDL documents in the vector space.Then,an advanced n-spectrum kernel function is defined,so that the similarity of two WSDL documents can be drawn by implementing the kernel function in the space.Using textual similarity and n-spectrum kernel values as features of low-level and mid-level,we build up a model to estimate the functional similarity between Web Services,whose parameters are learned by a ranking-SVM.Finally,a set of experiments were designed to verify the model,and the results showed that several metrics for the retrieval of Web Services have been improved by our approach.

  7. The impact of web services at the IRIS DMC

    Science.gov (United States)

    Weekly, R. T.; Trabant, C. M.; Ahern, T. K.; Stults, M.; Suleiman, Y. Y.; Van Fossen, M.; Weertman, B.

    2015-12-01

    The IRIS Data Management Center (DMC) has served the seismological community for nearly 25 years. In that time we have offered data and information from our archive using a variety of mechanisms ranging from email-based to desktop applications to web applications and web services. Of these, web services have quickly become the primary method for data extraction at the DMC. In 2011, the first full year of operation, web services accounted for over 40% of the data shipped from the DMC. In 2014, over ~450 TB of data was delivered directly to users through web services, representing nearly 70% of all shipments from the DMC that year. In addition to handling requests directly from users, the DMC switched all data extraction methods to use web services in 2014. On average the DMC now handles between 10 and 20 million requests per day submitted to web service interfaces. The rapid adoption of web services is attributed to the many advantages they bring. For users, they provide on-demand data using an interface technology, HTTP, that is widely supported in nearly every computing environment and language. These characteristics, combined with human-readable documentation and existing tools make integration of data access into existing workflows relatively easy. For the DMC, the web services provide an abstraction layer to internal repositories allowing for concentrated optimization of extraction workflow and easier evolution of those repositories. Lending further support to DMC's push in this direction, the core web services for station metadata, timeseries data and event parameters were adopted as standards by the International Federation of Digital Seismograph Networks (FDSN). We expect to continue enhancing existing services and building new capabilities for this platform. For example, the DMC has created a federation system and tools allowing researchers to discover and collect seismic data from data centers running the FDSN-standardized services. A future capability

  8. Aplikasi Informasi Restoran Berbasis Web Services di Kota Manado

    Directory of Open Access Journals (Sweden)

    Stenly Richard Pungus

    2016-09-01

    Full Text Available Teknologi web services adalah teknologi yang memungkinkan terbentuknya komunikasi antar dua atau lebih perangkat komputer yang memiliki lintas platform yang berbeda. Web services menggunakan teknologi XML dengan format SOAP dalam melakukan pertukaran informasi. Teknologi ini cocok untuk diintegrasikan di dalam proses bisnis, termasuk salah satunya adalah bisnis restoran khususnya restoran-restoran yang ada di kota Manado. Teknologi ini menjawab permasalahan yang dialami oleh para wisatawan yang datang berkunjung di kota Manado. Karena ketika mereka berkunjung di kota Manado, mereka kadangkala belum mengetahui informasi kuliner apa saja yang disajikan oleh restoran-restoran yang ada di kota Manado. Sehingga pada akhirnya dengan menggunakan teknologi ini, akan mempermudah wisatawan yang datang berkunjung di kota Manado dalam berkuliner. Penelitian ini bertujuan untuk mengimplementasikan teknologi JSON dan JAVA web services pada perangkat mobile Android sehingga dapat menjadi media informasi bagi wisatawan lokal  maupun wisatawan asing yang datang berkunjung di kota Manado dalam berkuliner. Penelitian ini didasarkan atas alur kerja metodologi penelitian Rational Unified Process (RUP yaitu metodologi penelitian yang bersifat parallel dalam setiap tahapan proses pembangunannya. Penelitian ini telah dilakukan dan menghasilkan sebuah aplikasi yang telah diuji. Aplikasi yang dibangun berhasil mengimplementasikan teknologi web services dari bahasa pemrograman Java dengan teknologi web services dari bahasa pemrograman PHP. Penggabungan kedua teknologi ini, menggabungkan informasi restoran-restoran yang ada di kota Manado untuk terintegrasi ke dalam sebuah aplikasi Android tanpa memandang apakah restoran terebut memiliki web services ataukah tidak. Apabila restoran tersebut tidak memiliki web services, mereka bisa menggunakan alternatif lain untuk memanfaatkan web services yang disediakan khusus bagi restoran-restoran yang tidak memiliki web services

  9. 基于.NET 的 Web Service 应用规划设计%Design of Web Service application programming based on.NET

    Institute of Scientific and Technical Information of China (English)

    范文广; 黄存东

    2015-01-01

    Web Service 的产生是为了解决跨平台和语言共享数据的问题。 Web Service 构建块解决了发现 Web Service及与 Web Service 通信的问题。在 Web Service 创建过程中,可以根据不同用户的喜好,选择利用记事本和 Visual Studio.NET。%The generation of Web Service is to address the issue of sharing data across platforms and language;Web Service building blocks, solve problems of finding Web Service and Web Service communication. Notepad and Visual Studio.NET are available for different users preferences in Web Service creation process.

  10. Storage Viability and Optimization Web Service

    Energy Technology Data Exchange (ETDEWEB)

    Stadler, Michael; Marnay, Christ; Lai, Judy; Siddiqui, Afzal; Limpaitoon, Tanachai; Phan, Trucy; Megel, Olivier; Chang, Jessica; DeForest, Nicholas

    2010-10-11

    Non-residential sectors offer many promising applications for electrical storage (batteries) and photovoltaics (PVs). However, choosing and operating storage under complex tariff structures poses a daunting technical and economic problem that may discourage potential customers and result in lost carbon and economic savings. Equipment vendors are unlikely to provide adequate environmental analysis or unbiased economic results to potential clients, and are even less likely to completely describe the robustness of choices in the face of changing fuel prices and tariffs. Given these considerations, researchers at Lawrence Berkeley National Laboratory (LBNL) have designed the Storage Viability and Optimization Web Service (SVOW): a tool that helps building owners, operators and managers to decide if storage technologies and PVs merit deeper analysis. SVOW is an open access, web-based energy storage and PV analysis calculator, accessible by secure remote login. Upon first login, the user sees an overview of the parameters: load profile, tariff, technologies, and solar radiation location. Each parameter has a pull-down list of possible predefined inputs and users may upload their own as necessary. Since the non-residential sectors encompass a broad range of facilities with fundamentally different characteristics, the tool starts by asking the users to select a load profile from a limited cohort group of example facilities. The example facilities are categorized according to their North American Industry Classification System (NAICS) code. After the load profile selection, users select a predefined tariff or use the widget to create their own. The technologies and solar radiation menus operate in a similar fashion. After these four parameters have been inputted, the users have to select an optimization setting as well as an optimization objective. The analytic engine of SVOW is LBNL?s Distributed Energy Resources Customer Adoption Model (DER-CAM), which is a mixed

  11. Service Composition in a Cloud Computing Environment

    OpenAIRE

    Abrha, Abrha; Heggen Skogen, Endre

    2011-01-01

    Today, composite services can be constructed by combining and coordinating a set of independent services in a process referred to as a service composition. Due to their dependencies on external components, composite services are especially dependent on a reliable hosting environment. The next generation service delivery platform, cloud computing, is emerging as a hosting environment that can support these service compositions better than a traditional hosting environment. This is mainly due t...

  12. Mobile Police Information System Based on Web Services

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The demand for communications anywhere, anytime, and on any device without recording the date is growing with the development of modern information technologies. Current wireless communications enable people to freely exchange information, while web services provide loosely-coupled, language-neutral, and platform-independent ways of linking applications within organizations, across enterprises, and across the Internet. This paper describes a mobile information system for police service, which integrates wireless communication technologies and web service technologies. The system satisfies the special demands of police information systems, such as security and interoperability. Policemen in the system can use various kinds of mobile terminals, such as mobile phones, tablet PCs, personal digital assistants, and laptops equipped with wireless LAN or GPRS to access data in the central database. The system is based on web services with a secure web service architecture and simple object access protocol message passing.

  13. A Sensor Web and Web Service-Based Approach for Active Hydrological Disaster Monitoring

    Directory of Open Access Journals (Sweden)

    Xi Zhai

    2016-09-01

    Full Text Available Rapid advancements in Earth-observing sensor systems have led to the generation of large amounts of remote sensing data that can be used for the dynamic monitoring and analysis of hydrological disasters. The management and analysis of these data could take advantage of distributed information infrastructure technologies such as Web service and Sensor Web technologies, which have shown great potential in facilitating the use of observed big data in an interoperable, flexible and on-demand way. However, it remains a challenge to achieve timely response to hydrological disaster events and to automate the geoprocessing of hydrological disaster observations. This article proposes a Sensor Web and Web service-based approach to support active hydrological disaster monitoring. This approach integrates an event-driven mechanism, Web services, and a Sensor Web and coordinates them using workflow technologies to facilitate the Web-based sharing and processing of hydrological hazard information. The design and implementation of hydrological Web services for conducting various hydrological analysis tasks on the Web using dynamically updating sensor observation data are presented. An application example is provided to demonstrate the benefits of the proposed approach over the traditional approach. The results confirm the effectiveness and practicality of the proposed approach in cases of hydrological disaster.

  14. Mining biological pathways using WikiPathways web services.

    Directory of Open Access Journals (Sweden)

    Thomas Kelder

    Full Text Available WikiPathways is a platform for creating, updating, and sharing biological pathways [1]. Pathways can be edited and downloaded using the wiki-style website. Here we present a SOAP web service that provides programmatic access to WikiPathways that is complementary to the website. We describe the functionality that this web service offers and discuss several use cases in detail. Exposing WikiPathways through a web service opens up new ways of utilizing pathway information and assisting the community curation process.

  15. Mining biological pathways using WikiPathways web services.

    Science.gov (United States)

    Kelder, Thomas; Pico, Alexander R; Hanspers, Kristina; van Iersel, Martijn P; Evelo, Chris; Conklin, Bruce R

    2009-07-30

    WikiPathways is a platform for creating, updating, and sharing biological pathways [1]. Pathways can be edited and downloaded using the wiki-style website. Here we present a SOAP web service that provides programmatic access to WikiPathways that is complementary to the website. We describe the functionality that this web service offers and discuss several use cases in detail. Exposing WikiPathways through a web service opens up new ways of utilizing pathway information and assisting the community curation process.

  16. Beginning Amazon Web Services with Node.js

    CERN Document Server

    Shackelford, Adam

    2015-01-01

    Beginning Amazon Web Services with Node.js teaches any novice Node.js developer to configure, deploy, and maintain scalable small to large scale Node.js applications in Amazon Web Services. Hosting a Node.js application in a production environment usually means turning to PaaS hosting, but this approach brings problems. Deploying Node.js directly to AWS solves the problems you encounter in these situations, enabling you to cut out the middle man. You will begin with a basic RESTful web service in Node.js, using the popular Express.js framework, pre-built and ready to run in your local env

  17. Architecting Secure Web Services using Model Driven Agile Modeling

    Directory of Open Access Journals (Sweden)

    Dr.B.Padmaja Rani,

    2010-09-01

    Full Text Available The importance of the software security has been profound, since most attacks to software systems are based on vulnerabilities caused by poorly designed and developed software. Design flaws account for fifty percent of security problems and risk analysis plays essential role in solid security problems. Service Web Services are an integral part of next generation Web applications. The development and use of these services is growing at an incredible rate, and so too security issues surrounding them. If the history of inter-application communication repeats itself, the ease with which web services architectures publish information about applications across thenetwork is only going to result in more application hacking. At the very least, it’s going to put an even greater burden on web architects and developers to design and write secure code. Developing specification like WS-Security should be leveraged as secure maturity happens over firewalls. In this paper, we want to discuss security architectures design patterns for Service Oriented Web Services. Finally, we validated this by implementing a case study of a Service Oriented Web Services application StockTrader Security using WS-Security and WS-Secure Conversation.

  18. 基于XML的Web Service技术%The Web Service Technology Based on XML

    Institute of Scientific and Technical Information of China (English)

    隋欣

    2013-01-01

    The new generation of markup language-XML was created to solve the Web related data. It plays an important role all over the Service functions of Web Service system. This paper expounds the foundational value of XML in Web Service system from three aspects:the XML technical characteristics,its role in Web services, Web Service principle and the realization of the technology platform system.%为解决Web相关数据处理问题而诞生的新一代置标语言XML,在Web Service体系各服务功能实现中无处不在地发挥着重要的作用。本文从XML技术特点、在Web服务中的作用及Web Service的原理和技术平台体系的实现三个方面阐述了XML在Web Service体系中的基石价值。

  19. 基于改进遗传算法的QoS感知Web服务组合%Web Service Composition Supporting QoS Based on Improved Genetic Algorithm

    Institute of Scientific and Technical Information of China (English)

    马小洁; 王晓军

    2012-01-01

    Even or random selecting is the common method used for generating initial population in genetic algorithm, however, the average fitness of the population generated by this method is low, and it is hard to ensure the searching efficiency of algorithm. In this study, propose a novel genetic algorithm (GA) for handling QoS-aware Web service composition, combining two initialized algorithms with GA at initialization stage to improve the algorithm effectiveness. Besides, build a path-template and variable length chromosomes service composition solution, for template paths will make the work easy and variable length chromosomes can support multi-path QoS-aware service composition. The superiority of the algorithm is analyzed theoretically and its effectiveness is demonstrated by experimental results.%传统遗传算法在种群初始化的时候,普遍采用均匀取种法或随机取种法,这些方法生成的种群的平均适应度比较低,难以保证算法的搜索效率.文中提出一种改进的遗传算法用于QoS敏感的Web服务组合,采用两种不同的算法进行服务选择,避免了随机生成初始种群给算法带来的负面影响.并且,该算法将路径模板化以减少服务组合的工作量,用染色体可变长的编码方式来解决组合服务的多路径选择问题.通过仿真实验,与传统的算法相比,所提出的算法在实现服务组合时收敛更快,最优解的适应度更高.

  20. An Authentication system of Web Services Based on Web Server Log Analysis

    Directory of Open Access Journals (Sweden)

    R. Joseph Manoj

    2014-01-01

    Full Text Available Authentication is a method which validates users' identity prior to permitting them to access the web services. To enhance the security of web services, providers follow varieties of authentication methods to restrict malicious users from accessing the services. This paper proposes a new authentication method which claims user’s identity by analyzing web server log files which includes the details of requesting user’s IP address, username, password, date and time of request, status code, URL etc., and checks IP address spoofing using ingress packet filtering method. This paper also analyses the resultant data and performance of the proposed work.

  1. 基于WebService的WebGIS性能的优化%The Optimization on the Performance of WebGIS Based on Web Service

    Institute of Scientific and Technical Information of China (English)

    韩双旺

    2011-01-01

    由于GIS中不但涉及属性数据,而且还涉及地理空间数据,因此数据量相对庞大,所以在设计和实现WebGIS时。必须考虑其性能问题.为了更高效地实现基于WebService的WebGIS的相关功能,有必要对其性能进行优化,这可通过增大Web Service颗粒度,不使用XML作为WebGIS系统内部的接口,压缩SOAP,通过异步访问服务器端Web Service中的Web方法,优化数据库,使用客户端和服务器端缓存等一系列优化措施来加快数据的访问速度,减轻网络传输负载,提高基于Web Service的WebGIS性能.%It not only includes attribute data in the CIS, but also includes the geo-spatial data, arelatively large amount of data, so we must consider the performance issues in the design and implementation of WebGIS. In order to more efficiently" implement the relative functions of a WebGIS based on Web Service, it is necessary to optimize the performance, which can increase the particle size of Web Service, do not use XML as the WebGIS interface within the system; compressed SOAP, an asynchronous Access Web method in Web Service of server-side, optimizing the database, using the client and server side caching and a series of optimization measures to speed up data access speed and reduce network traffic loads and improve the performance of WebGIS based on Web Service.

  2. Automatic web services classification based on rough set theory

    Institute of Scientific and Technical Information of China (English)

    陈立; 张英; 宋自林; 苗壮

    2013-01-01

    With development of web services technology, the number of existing services in the internet is growing day by day. In order to achieve automatic and accurate services classification which can be beneficial for service related tasks, a rough set theory based method for services classification was proposed. First, the services descriptions were preprocessed and represented as vectors. Elicited by the discernibility matrices based attribute reduction in rough set theory and taking into account the characteristic of decision table of services classification, a method based on continuous discernibility matrices was proposed for dimensionality reduction. And finally, services classification was processed automatically. Through the experiment, the proposed method for services classification achieves approving classification result in all five testing categories. The experiment result shows that the proposed method is accurate and could be used in practical web services classification.

  3. Going, going, still there: using the WebCite service to permanently archive cited web pages.

    Science.gov (United States)

    Eysenbach, Gunther; Trudel, Mathieu

    2005-12-30

    Scholars are increasingly citing electronic "web references" which are not preserved in libraries or full text archives. WebCite is a new standard for citing web references. To "webcite" a document involves archiving the cited Web page through www.webcitation.org and citing the WebCite permalink instead of (or in addition to) the unstable live Web page. This journal has amended its "instructions for authors" accordingly, asking authors to archive cited Web pages before submitting a manuscript. Almost 200 other journals are already using the system. We discuss the rationale for WebCite, its technology, and how scholars, editors, and publishers can benefit from the service. Citing scholars initiate an archiving process of all cited Web references, ideally before they submit a manuscript. Authors of online documents and websites which are expected to be cited by others can ensure that their work is permanently available by creating an archived copy using WebCite and providing the citation information including the WebCite link on their Web document(s). Editors should ask their authors to cache all cited Web addresses (Uniform Resource Locators, or URLs) "prospectively" before submitting their manuscripts to their journal. Editors and publishers should also instruct their copyeditors to cache cited Web material if the author has not done so already. Finally, WebCite can process publisher submitted "citing articles" (submitted for example as eXtensible Markup Language [XML] documents) to automatically archive all cited Web pages shortly before or on publication. Finally, WebCite can act as a focussed crawler, caching retrospectively references of already published articles. Copyright issues are addressed by honouring respective Internet standards (robot exclusion files, no-cache and no-archive tags). Long-term preservation is ensured by agreements with libraries and digital preservation organizations. The resulting WebCite Index may also have applications for research

  4. Communicating data quality through Web Map Services

    Science.gov (United States)

    Blower, Jon; Roberts, Charles; Griffiths, Guy; Lewis, Jane; Yang, Kevin

    2013-04-01

    The sharing and visualization of environmental data through spatial data infrastructures is becoming increasingly common. However, information about the quality of data is frequently unavailable or presented in an inconsistent fashion. ("Data quality" is a phrase with many possible meanings but here we define it as "fitness for purpose" - therefore different users have different notions of what constitutes a "high quality" dataset.) The GeoViQua project (www.geoviqua.org) is developing means for eliciting, formatting, discovering and visualizing quality information using ISO and Open Geospatial Consortium (OGC) standards. Here we describe one aspect of the innovations of the GeoViQua project. In this presentation, we shall demonstrate new developments in using Web Map Services to communicate data quality at the level of datasets, variables and individual samples. We shall outline a new draft set of conventions (known as "WMS-Q"), which describe a set of rules for using WMS to convey quality information (OGC draft Engineering Report 12-160). We shall demonstrate these conventions through new prototype software, based upon the widely-used ncWMS software, that applies these rules to enable the visualization of uncertainties in raster data such as satellite products and the results of numerical simulations. Many conceptual and practical issues have arisen from these experiments. How can source data be formatted so that a WMS implementation can detect the semantic links between variables (e.g. the links between a mean field and its variance)? The visualization of uncertainty can be a complex task - how can we provide users with the power and flexibility to choose an optimal strategy? How can we maintain compatibility (as far as possible) with existing WMS clients? We explore these questions with reference to existing standards and approaches, including UncertML, NetCDF-U and Styled Layer Descriptors.

  5. Web Service Composition Optimization Method Based on QoS Multi-attribute Decision Making%基于QoS多属性决策的Web服务组合优化方法

    Institute of Scientific and Technical Information of China (English)

    冯艳; 陈富赞

    2015-01-01

    从海量候选服务组合计划中选择具有最优/满意服务质量( QoS)的计划,即基于QoS的Web服务组合,是面向服务计算的难题之一。为此,将该问题建模为多属性决策问题,同时针对传统多属性决策方法难以处理海量搜索空间的问题,提出一种结合折中比例法和遗传算法的新型智能进化算法( GACRM )。 GACRM结合了折中比例法的方案排序优势和遗传算法高效的全局搜索能力,能够从海量搜索空间中快速找到全局近似最优解。实验结果表明,该算法不仅能够高效地产生与折中比例法接近的最优方案排序,且在解决大规模Web服务组合问题上具有良好的可伸缩性。%The problem of Quality of Service ( QoS)-based Web Service Composition ( QWSC), i. e. , selecting an optimal/satisfactory Service Composition Plan( SCP) from numerous candidate plans on the basis of QoS properties,is the most critical issue in the service-oriented computing. In this paper,the problem of QWSC is formulated as a Multi-Attribute Decision Making ( MADM ) representation. Furthermore, an intelligent evolutionary algorithm:Genetic Algorithm based Compromise Ratio Method ( GACRM ) is developed to solve the MADM problem. Combining with the advantage of Compromise Ratio Method( CRM) in terms of ranking alternatives,together with the superiority of Genetic Algorithm( GA) in terms of global search,GACRM is capable of finding an approximate optimal solution from a massive search space. Experimental result shows that GACRM is highly efficient and scalable for large-scale QWSC problems.

  6. A Web Service and Interface for Remote Electronic Device Characterization

    Science.gov (United States)

    Dutta, S.; Prakash, S.; Estrada, D.; Pop, E.

    2011-01-01

    A lightweight Web Service and a Web site interface have been developed, which enable remote measurements of electronic devices as a "virtual laboratory" for undergraduate engineering classes. Using standard browsers without additional plugins (such as Internet Explorer, Firefox, or even Safari on an iPhone), remote users can control a Keithley…

  7. Service Learning and Building Community with the World Wide Web

    Science.gov (United States)

    Longan, Michael W.

    2007-01-01

    The geography education literature touts the World Wide Web (Web) as a revolutionary educational tool, yet most accounts ignore its uses for public communication and creative expression. This article argues that students can be producers of content that is of service to local audiences. Drawing inspiration from the community networking movement,…

  8. Flexible Generation of Pervasive Web Services using OSGi Declarative Services and OWL Ontologies

    DEFF Research Database (Denmark)

    Hansen, Klaus Marius; Zhang, Weishan; Fernandes, Joao

    2008-01-01

    There is a growing trend to deploy web services in pervasive computing environments. Implementing web services on networked, embedded devices leads to a set of challenges, including productivity of development, efficiency of web services, and handling of variability and dependencies of hardware...... and software platforms. To address these challenges, we developed a web service compiler called Limbo, in which Web Ontology Language (OWL) ontologies are used to make the Limbo compiler aware of its compilation context such as device hardware and software details, platform dependencies, and resource....../power consumption. The ontologies are used to configure Limbo for generating resource-efficient web service code. The architecture of Limbo follows the Blackboard architectural style and Limbo is implemented using the OSGi Declarative Services component model. The component model provides high flexibility...

  9. Weighted Priority Queuing: A New Scheduling Strategy for Web Services

    Directory of Open Access Journals (Sweden)

    Randa. Hammami

    2017-02-01

    Full Text Available Web services are considered as one of the best and most widespread solution for handling the interoperability problem and the challenge of integration. The proliferation of Web services over the Internet becomes more and more significant. They are henceforth playing an important role in several fields such as ehealth, e-commerce and e-learning. Thus, one important question arises: how to manage Web services more efficiently? It is a key problem to the Web services based- applications at present especially that the need to enhance the Quality of Services (QoS is constantly growing: the better the QoS are, the more the users are satisfied. This has spurred the study of scheduling algorithms for providing QoS guarantees. In this paper we put the light on the Web services requests scheduling strategies on the server side. In fact, we present a brief overview and a comparative evaluation of three queuing scheduling disciplines for Web services, which are: First in First out (FIFO, Priority Queuing (PQ and Weighted Fair Queuing (WFQ. Then, we put forward a new scheduling strategy based on two wellknown strategies namely: Priority Queuing and Weighted Fair Queuing. The experimental results highlight the merits and shortcomings of each scheduling discipline in addition to its performance in terms of: execution time, communication time and response time

  10. A Proxy-Based Approach to Enhancing the Autonomic Behavior in Composite Services

    Directory of Open Access Journals (Sweden)

    Onyeka Ezenwoye

    2008-05-01

    Full Text Available Web services paradigm is allowing applications to electronically interact with one another over the Internet. The business process execution language (BPEL takes this interaction to a higher level of abstraction by enabling the development of aggregate Web services. However, the autonomous and distributed nature of the partner services in an aggregate Web service present unique challenges to the reliability of the composite services. In this paper, we present an approach where existing BPEL processes are automatically instrumented, so that when one or more of their partner services do not provide satisfactory service (e.g., because of a service being overwhelmed, crashed, or because of a network outage, the request for service is redirected to a proxy Web service, where the failed or slow services are replaced by substitute services.

  11. WIWS: a protein structure bioinformatics Web service collection.

    Science.gov (United States)

    Hekkelman, M L; Te Beek, T A H; Pettifer, S R; Thorne, D; Attwood, T K; Vriend, G

    2010-07-01

    The WHAT IF molecular-modelling and drug design program is widely distributed in the world of protein structure bioinformatics. Although originally designed as an interactive application, its highly modular design and inbuilt control language have recently enabled its deployment as a collection of programmatically accessible web services. We report here a collection of WHAT IF-based protein structure bioinformatics web services: these relate to structure quality, the use of symmetry in crystal structures, structure correction and optimization, adding hydrogens and optimizing hydrogen bonds and a series of geometric calculations. The freely accessible web services are based on the industry standard WS-I profile and the EMBRACE technical guidelines, and are available via both REST and SOAP paradigms. The web services run on a dedicated computational cluster; their function and availability is monitored daily.

  12. MODAPS Web Services API for LANCE-MODIS

    Data.gov (United States)

    National Aeronautics and Space Administration — MODAPS Web Services API for LANCE-MODIS. This Application Programming Interface (API) encompasses a library of functions that provides programmatic data access to...

  13. EnviroAtlas Near Road Tree Buffer Web Service

    Data.gov (United States)

    U.S. Environmental Protection Agency — This EnviroAtlas web service supports research and online mapping activities related to EnviroAtlas (https://www.epa.gov/enviroatlas). This EnviroAtlas dataset...

  14. Web geoprocessing services on GML with a fast XML database ...

    African Journals Online (AJOL)

    Web geoprocessing services on GML with a fast XML database. ... However, sometimes the users first have to process available spatial data to obtain the ... we proposed a suitable system prototype design combining the Model View Controller ...

  15. EnviroAtlas Proximity to Parks Web Service

    Data.gov (United States)

    U.S. Environmental Protection Agency — This EnviroAtlas web service supports research and online mapping activities related to EnviroAtlas (https://www.epa.gov/enviroatlas). This EnviroAtlas dataset shows...

  16. EnviroAtlas Green Space Proximity Gradient Web Service

    Data.gov (United States)

    U.S. Environmental Protection Agency — This EnviroAtlas web service supports research and online mapping activities related to EnviroAtlas (https://www.epa.gov/enviroatlas). In any given 1-square meter...

  17. EnviroAtlas Impervious Proximity Gradient Web Service

    Data.gov (United States)

    U.S. Environmental Protection Agency — This EnviroAtlas web service supports research and online mapping activities related to EnviroAtlas (https://www.epa.gov/enviroatlas). In any given 1-square meter...

  18. SSWAP: A Simple Semantic Web Architecture and Protocol for Semantic Web Services

    Science.gov (United States)

    SSWAP (Simple Semantic Web Architecture and Protocol) is an architecture, protocol, and platform for using reasoning to semantically integrate heterogeneous disparate data and services on the web. SSWAP is the driving technology behind the Virtual Plant Information Network, an NSF-funded semantic w...

  19. SELECTION OF ONTOLOGY FOR WEB SERVICE DESCRIPTION LANGUAGE TO ONTOLOGY WEB LANGUAGE CONVERSION

    Directory of Open Access Journals (Sweden)

    J. Mannar Mannan

    2014-01-01

    Full Text Available Semantic web is to extend the current human readable web to encoding some of the semantic of resources in a machine processing form. As a Semantic web component, Semantic Web Services (SWS uses a mark-up that makes the data into detailed and sophisticated machine readable way. One such language is Ontology Web Language (OWL. Existing conventional web service annotation can be changed to semantic web service by mapping Web Service Description Language (WSDL with the semantic annotation of OWL-S. In this conversion of WSDL to OWL process, the ontology plays a vital role. Ontology can be stored and retrieved from local repository and selecting the appropriate ontology is a complicated process and this can be achieved by Ontology Searching and Property Matching (OSPM engine. Ontology is stored in the local repository as ontology document and exact matching of ontology for the requested query can be searched using semantic similarity ranking method. High ranked classes of ontology will undergo property matching; here requested concept will be matched with the resulting property. OSPM engine act as the backbone for selecting an exact ontology and reduce the conflict that occurs while selecting the ontology for annotation purpose.

  20. INTELLIGENT SEARCH ENGINE-BASED UNIVERSAL DESCRIPTION, DISCOVERY AND INTEGRATION FOR WEB SERVICE DISCOVERY

    Directory of Open Access Journals (Sweden)

    Tamilarasi Karuppiah

    2014-01-01

    Full Text Available Web Services standard has been broadly acknowledged by industries and academic researches along with the progress of web technology and e-business. Increasing number of web applications have been bundled as web services that can be published, positioned and invoked across the web. The importance of the issues regarding their publication and innovation attains a maximum as web services multiply and become more advanced and mutually dependent. With the intension of determining the web services through effiective manner with in the minimum time period in this study proposes an UDDI with intelligent serach engine. In order to publishing and discovering web services initially, the web services are published in the UDDI registry subsequently the published web services are indexed. To improve the efficiency of discovery of web services, the indexed web services are saved as index database. The search query is compared with the index database for discovering of web services and the discovered web services are given to the service customer. The way of accessing the web services is stored in a log file, which is then utilized to provide personalized web services to the user. The finding of web service is enhanced significantly by means of an efficient exploring capability provided by the proposed system and it is accomplished of providing the maximum appropriate web service. Universal Description, Discovery and Integration (UDDI.

  1. Performance of SOAP in Web Service Environment compared to CORBA

    OpenAIRE

    Paulsson, Ulf; Elfwing, Robert

    2002-01-01

    Web Services is one of the latest golden concepts that promise flexibility and unlimited potential for interconnection between systems of the same or different type. The communication is based on SOAP ? Simple Object Access Protocol, which is founded on XML (eXtended Markup Language). We have made experiments with SOAP in a Web Service Environment to find out the performance in response time using SOAP compared to CORBA. Unsurprisingly CORBA (Common Object Request Broker Architecture) is sign...

  2. Web service without SOAP%无SOAP的Web服务

    Institute of Scientific and Technical Information of China (English)

    杨晓慧

    2002-01-01

    描述一个更通用的、独立于SOAP的调用Web服务的方法,称之为"Web服务调用框架'(Web Service Invocation Framework(WSIF)).它专门设计来直接调用"Web服务描述语言"(Web Services Description Language(WSDL))描述的Web服务,隐藏了底层访问协议(比如SOAP)的复杂性.

  3. Enhancing E-Learning through Web Service and Intelligent Agents

    Directory of Open Access Journals (Sweden)

    Nasir Hussain

    2006-04-01

    Full Text Available E-learning is basically the integration of various technologies. E-Learning technology is now maturing and we can find a multiplicity of standards. New technologies such as agents and web services are promising better results. In this paper we have proposed an e-learning architecture that is dependent on intelligent agent systems and web services. These communication technologies will make the architecture more robust, scalable and efficient.

  4. Developing RESTful web services with Jersey 2.0

    CERN Document Server

    Gulabani, Sunil

    2013-01-01

    The book will follow a standard tutorial approach and will teach readers how to use the Jersey API for creating RESTful web services.This book is intended for Java EE developers who are building applications on the REST architecture. This is a quick, hands-on guide for learning JAX-RS 2.0. Developers should have some knowledge about RESTful web services but it's not essential to know JAX-RS 1.0.

  5. A REGISTRY BASED DISCOVERY MECHANISM FOR E-LEARNING WEB SERVICES

    Directory of Open Access Journals (Sweden)

    Demian Antony D’Mello

    2012-10-01

    Full Text Available E-learning is currently taking the shape of a Web Service in various applications i.e. learners can search for suitable content, book it, pay for it and consume it. This paper shows how the search aspects for e-learning content can technically be combined with the recent standardization efforts that aim at content exchangeability and efficient reuse. A repository for learning object publication and search is proposed that essentially adapts the UDDI framework used in commercial Web Services to the e-learning context. To adopt Web Services technology towards the reusability and aggregation of e-learning services, the conceptual Web Services architecture and its building blocks need to be augmented. The objective of this research is to design broker based registry architecture for e- Web services which facilitates effective elearning content/service discovery for the consumption or composition. The implementation followed by experimentation showed that, the proposed e-learning discovery architecture facilitates effective discovery with moderate performance in terms of overall response.

  6. Supporting B2B Business Documents in XML Web Services

    Institute of Scientific and Technical Information of China (English)

    KIM Hyoungdo

    2004-01-01

    While XML web services become recognized as a solution to business-to-business transactions, there are many problems that should be solved. For example, it is not easy to manipulate business documents of existing standards such as RosettaNet and UN/EDIFACT EDI, traditionally regarded as an important resource for managing B2B relationships. As a starting point for the complete implementation of B2B web services, this paper deals with how to support B2B business documents in XML web services. In the first phase, basic requirements for driving XML web services by business documents are introduced. As a solution, this paper presents how to express B2B business documents in WSDL, a core standard for XML web services. This kind of approach facilitates the reuse of existing business documents and enhances interoperability between implemented web services. Furthermore, it suggests how to link with other conceptual modeling frameworks such as ebXML/UMM, built on a rich heritage of electronic business experience.

  7. Provenance-Based Approaches to Semantic Web Service Discovery and Usage

    Science.gov (United States)

    Narock, Thomas William

    2012-01-01

    The World Wide Web Consortium defines a Web Service as "a software system designed to support interoperable machine-to-machine interaction over a network." Web Services have become increasingly important both within and across organizational boundaries. With the recent advent of the Semantic Web, web services have evolved into semantic…

  8. Provenance-Based Approaches to Semantic Web Service Discovery and Usage

    Science.gov (United States)

    Narock, Thomas William

    2012-01-01

    The World Wide Web Consortium defines a Web Service as "a software system designed to support interoperable machine-to-machine interaction over a network." Web Services have become increasingly important both within and across organizational boundaries. With the recent advent of the Semantic Web, web services have evolved into semantic…

  9. WSC-07: Evolving the Web Services Challenge

    NARCIS (Netherlands)

    Blake, M. Brian; Cheung, William K.W.; Jaeger, Michael C.; Wombacher, Andreas

    2007-01-01

    Service-oriented architecture (SOA) is an evolving architectural paradigm where businesses can expose their capabilities as modular, network-accessible software services. By decomposing capabilities into modular services, organizations can share their offerings at multiple levels of granularity whil

  10. ASP.NET web API build RESTful web applications and services on the .NET framework

    CERN Document Server

    Kanjilal, Joydip

    2013-01-01

    This book is a step-by-step, practical tutorial with a simple approach to help you build RESTful web applications and services on the .NET framework quickly and efficiently.This book is for ASP.NET web developers who want to explore REST-based services with C# 5. This book contains many real-world code examples with explanations whenever necessary. Some experience with C# and ASP.NET 4 is expected.

  11. Business Systems Branch Abilities, Capabilities, and Services Web Page

    Science.gov (United States)

    Cortes-Pena, Aida Yoguely

    2009-01-01

    During the INSPIRE summer internship I acted as the Business Systems Branch Capability Owner for the Kennedy Web-based Initiative for Communicating Capabilities System (KWICC), with the responsibility of creating a portal that describes the services provided by this Branch. This project will help others achieve a clear view ofthe services that the Business System Branch provides to NASA and the Kennedy Space Center. After collecting the data through the interviews with subject matter experts and the literature in Business World and other web sites I identified discrepancies, made the necessary corrections to the sites and placed the information from the report into the KWICC web page.

  12. Geo-communication, web-services, and spatial data infrastructure

    DEFF Research Database (Denmark)

    Brodersen, Lars; Nielsen, Anders

    2007-01-01

    The introduction of web-services as index-portals based on geo-information has changed the conditions for both content and form of geo-communication. A high number of players and interactions as well as a very high number of all kinds of information and combinations of these caracterise web...... looks very complex, and it will get even more complex. Therefore, there is a strong need for theories and models that can describe this complex web in the SDI and geo-communication consisting of active components, passive components, users, and information in order to make it possible to handle......, collaboration, standards, models, specifications, web services, and finally the information. Awareness of the complexity is necessary, and structure is needed to make it possible for the geo-information community to pull together in the same direction. Modern web-based geo-communication and its infrastucture...

  13. 一种基于语义的Web服务组合方法%A semantic-based method for web services composition

    Institute of Scientific and Technical Information of China (English)

    赵春娟; 肖迎元

    2010-01-01

    在考虑服务语义匹配和服务质量(Quality of Services, QoS)的基础上,利用子服务间及其内部低耦合高内聚的特性,提出了一种基于语义的Web服务组合算法.该算法定义了用户关注度(Customer Attention, CA)和最优信息组(Optimal Information Group, OIG),充分利用语义本体的特性,从信息和QoS两个方面筛选最优原子服务集,从而提高服务的查准率与查全率,增强与用户的交互能力.

  14. Geo-communication, web-services, and spatial data infrastructure

    DEFF Research Database (Denmark)

    Brodersen, Lars; Nielsen, Anders

    2007-01-01

    The introduction of web-services as index-portals based on geo-information has changed the conditions for both content and form of geo-communication. A high number of players and interactions as well as a very high number of all kinds of information and combinations of these caracterise web...... services, where maps are only a part of the whole. This chapter discusses the relations between the different components of SDI and geo-communication as well as the impact thereof. Discussed is also a model for the organization of the passive components of the infrastructure; that is, legislation......, collaboration, standards, models, specifications, web services, and finally the information. Awareness of the complexity is necessary, and structure is needed to make it possible for the geo-information community to pull together in the same direction. Modern web-based geo-communication and its infrastucture...

  15. WEFES - Web explorer of forest ecosystems services under climate change

    OpenAIRE

    2010-01-01

    Poster Climate change will change the dynamics of forest environmental services. All the change complexity involved is difficult to visualize under an easy and accessible information tool capable to integrate several services that forests can provide. A preliminary Web-Explorer of Forest Ecosystems Services was developed for New Zealand where forest managers and the general public can observe what are the predictions of the different forest environmental services under current and futu...

  16. A Study of CAPTCHAs for Securing Web Services

    CERN Document Server

    Banday, M Tariq

    2011-01-01

    Atomizing various Web activities by replacing human to human interactions on the Internet has been made indispensable due to its enormous growth. However, bots also known as Web-bots which have a malicious intend and pretending to be humans pose a severe threat to various services on the Internet that implicitly assume a human interaction. Accordingly, Web service providers before allowing access to such services use various Human Interaction Proof's (HIPs) to authenticate that the user is a human and not a bot. Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA) is a class of HIPs tests and are based on Artificial Intelligence. These tests are easier for humans to qualify and tough for bots to simulate. Several Web services use CAPTCHAs as a defensive mechanism against automated Web-bots. In this paper, we review the existing CAPTCHA schemes that have been proposed or are being used to protect various Web services. We classify them in groups and compare them with each other i...

  17. SEMANTIC ENHANCED UDDI USING OWL-S PROFILE ONTOLOGY FOR THE AUTOMATIC DISCOVERY OF WEB SERVICES IN THE DOMAIN OF TELECOMMUNICATION

    Directory of Open Access Journals (Sweden)

    R. Lakshmana Kumar

    2014-01-01

    Full Text Available The current web services which are evolved in the telecom domain such as payment web services, Yellow pages web services, operator web services, weather web services are failed to bring down the semantic as they used to prove its syntactic description. The reason for bringing down the semantic description into already existing web services will invoke certain operations like automatic discovery of web services, automatic composition of the necessary services, automatic invocation of web services and automatic monitoring of the execution process. At present the web services in the domain of telecommunication is following the parlay X standard. The parlay X has given a set of standard web service API’s for the telecom. The each of the services will have its own interface, services and types In this study in order to bring down the semantic representation we have proposed an idea to enable the semantic through the upper ontology like OWL-S and then how to map OWL-S to UDDI registry and also we have discussed some of the issues that we have faced while mapping OWL-S into UDDI registry. So the approach which we are going to propose improves the accuracy of the telecommunication network services description, discovery and matching, unifies the semantic representation of telecommunications network and Internet services.

  18. UrbanWeb: a Platform for Mobile, Context-aware Web Services

    DEFF Research Database (Denmark)

    Hansen, Frank Allan; Grønbæk, Kaj

    2011-01-01

    much benefit from being informed about the user’s context and tailored to the user’s location or the activities the user is engaged in. In this article we focus on the definition of context and context-awareness for mobile Web 2.0 services and we present a framework, UrbanWeb, which has been designed......Faster Internet connections on the mobile Internet and new advanced mobile terminals make it possible to use Web 2.0 applications and service beyond the desktop wherever and whenever you want. However, even though some service may scale in their current form to the mobile Internet, others will very...... to support these kinds of services. UrbanWeb implements context as an extension to the notion of Web 2.0 tagging and provides developers with an easy to use platform for context-aware Web services for different kind of applications. The article also discusses how to acquire different cues about the user...

  19. UrbanWeb: a Platform for Mobile, Context-aware Web Services

    DEFF Research Database (Denmark)

    Hansen, Frank Allan; Grønbæk, Kaj

    2011-01-01

    much benefit from being informed about the user’s context and tailored to the user’s location or the activities the user is engaged in. In this article we focus on the definition of context and context-awareness for mobile Web 2.0 services and we present a framework, UrbanWeb, which has been designed......Faster Internet connections on the mobile Internet and new advanced mobile terminals make it possible to use Web 2.0 applications and service beyond the desktop wherever and whenever you want. However, even though some service may scale in their current form to the mobile Internet, others will very...... to support these kinds of services. UrbanWeb implements context as an extension to the notion of Web 2.0 tagging and provides developers with an easy to use platform for context-aware Web services for different kind of applications. The article also discusses how to acquire different cues about the user...

  20. Mobile Web Service Discovery in Peer to Peer Networks

    CERN Document Server

    Srirama, Satish Narayana; Prinz, Wolfgang

    2010-01-01

    The advanced features of today's smart phones and hand held devices, like the increased memory and processing capabilities, allowed them to act even as information providers. Thus a smart phone hosting web services is not a fancy anymore. But the relevant discovery of these services provided by the smart phones has became quite complex, because of the volume of services possible with each Mobile Host providing some services. Centralized registries have severe drawbacks in such a scenario and alternate means of service discovery are to be addressed. P2P domain with it resource sharing capabilities comes quite handy and here in this paper we provide an alternate approach to UDDI registry for discovering mobile web services. The services are published into the P2P network as JXTA modules and the discovery issues of these module advertisements are addressed. The approach also provides alternate means of identifying the Mobile Host.

  1. Software Architectural Patterns for Service Composition

    Directory of Open Access Journals (Sweden)

    Ghadeer Ghazal

    2014-08-01

    Full Text Available Service - oriented computing is meant to support loose relationships between organizations; Service - oriented architectures often have the goal to integrate various distributed servic es of one or more organizations in a flexible way to be able to quickly react on business changes. Distributed services provided a new way of distributed computing that achieve the interoperability between heterogonous application through platform and lan guage independent interfaces. The creation of value added services by composition of existing ones is gaining a significant momentum. Distributed service composition is meant to support loose relationships between implemented services in order to provide n ew functions. A composite service is the one resulting from the integration, coordination and synchronization of different service components. In this paper, we generated A Services Composition Model (SCM that provides a general solution for the services composition problem by realizing the requirements of a new service using the requirements of the already existing service. We explained in details all the steps of the composition process; services registration, services discovery, services selection, serv ices invoking, and services integration. Although the SCM is not bounded to one particular algorithm to compose services, we generate d an application as an example to test our Service Composition Model. We also generated the Services Composition Language (SCL as a simple text - based language which allows the user to express the requirements of his request, the inserted request will then be analyzed using our Parsing Algorithm to determine the name of the requested services, after that our Service Composition Algorithm will execute all the steps of the composition process and return t he result of the composition to the user

  2. Web Services Harvesting Approach Based on Internet%基于Internet的Web Services收集方法

    Institute of Scientific and Technical Information of China (English)

    王立杰; 邹艳珍; 金靖; 赵俊峰; 谢冰

    2011-01-01

    Web Services作为一种部署在Internet上的新型的可复用软件资源,得到广泛的重视和应用.但是,现有通用搜索引擎并不能很好地支持Web Services的发现,这使得软件开发人员需要花费很大的代价寻找合适的Web Services.鉴于此,提出了一种基于Intemet的Web Services获取方法,采用通用搜索引擎和特定Web Services信息发布网站相结合的方法,从Internet上收集Web Services,并从Web Services的相关网页中抽取相关描述信息.利用收集到的Web Services数据,对当前互联网上的Web Services现状进行了统计分析.这些统计结果一定程度上反映了Web Services的发展现状.%As a special kind of reusable software resources on the Internet, Web Services have received great attention. However, general Web search engine cannot well support the discovery of Web Services, which makes developers have to spend a lot of efforts in order to acquire their desired Web Services. For this reason, this paper proposes an approach for harvesting Web Services from the Internet by leveraging general search engine and specific Web services portals. In addition, it also proposes an approach to extract descriptions for Web Services from their related Web pages on the Internet. Based on the harvested data, it conducts a statistics analysis on the status of Web Services on the Internet.

  3. SSWAP: A Simple Semantic Web Architecture and Protocol for semantic web services.

    Science.gov (United States)

    Gessler, Damian D G; Schiltz, Gary S; May, Greg D; Avraham, Shulamit; Town, Christopher D; Grant, David; Nelson, Rex T

    2009-09-23

    SSWAP (Simple Semantic Web Architecture and Protocol; pronounced "swap") is an architecture, protocol, and platform for using reasoning to semantically integrate heterogeneous disparate data and services on the web. SSWAP was developed as a hybrid semantic web services technology to overcome limitations found in both pure web service technologies and pure semantic web technologies. There are currently over 2400 resources published in SSWAP. Approximately two dozen are custom-written services for QTL (Quantitative Trait Loci) and mapping data for legumes and grasses (grains). The remaining are wrappers to Nucleic Acids Research Database and Web Server entries. As an architecture, SSWAP establishes how clients (users of data, services, and ontologies), providers (suppliers of data, services, and ontologies), and discovery servers (semantic search engines) interact to allow for the description, querying, discovery, invocation, and response of semantic web services. As a protocol, SSWAP provides the vocabulary and semantics to allow clients, providers, and discovery servers to engage in semantic web services. The protocol is based on the W3C-sanctioned first-order description logic language OWL DL. As an open source platform, a discovery server running at http://sswap.info (as in to "swap info") uses the description logic reasoner Pellet to integrate semantic resources. The platform hosts an interactive guide to the protocol at http://sswap.info/protocol.jsp, developer tools at http://sswap.info/developer.jsp, and a portal to third-party ontologies at http://sswapmeet.sswap.info (a "swap meet"). SSWAP addresses the three basic requirements of a semantic web services architecture (i.e., a common syntax, shared semantic, and semantic discovery) while addressing three technology limitations common in distributed service systems: i.e., i) the fatal mutability of traditional interfaces, ii) the rigidity and fragility of static subsumption hierarchies, and iii) the

  4. SSWAP: A Simple Semantic Web Architecture and Protocol for semantic web services

    Directory of Open Access Journals (Sweden)

    Town Christopher D

    2009-09-01

    Full Text Available Abstract Background SSWAP (Simple Semantic Web Architecture and Protocol; pronounced "swap" is an architecture, protocol, and platform for using reasoning to semantically integrate heterogeneous disparate data and services on the web. SSWAP was developed as a hybrid semantic web services technology to overcome limitations found in both pure web service technologies and pure semantic web technologies. Results There are currently over 2400 resources published in SSWAP. Approximately two dozen are custom-written services for QTL (Quantitative Trait Loci and mapping data for legumes and grasses (grains. The remaining are wrappers to Nucleic Acids Research Database and Web Server entries. As an architecture, SSWAP establishes how clients (users of data, services, and ontologies, providers (suppliers of data, services, and ontologies, and discovery servers (semantic search engines interact to allow for the description, querying, discovery, invocation, and response of semantic web services. As a protocol, SSWAP provides the vocabulary and semantics to allow clients, providers, and discovery servers to engage in semantic web services. The protocol is based on the W3C-sanctioned first-order description logic language OWL DL. As an open source platform, a discovery server running at http://sswap.info (as in to "swap info" uses the description logic reasoner Pellet to integrate semantic resources. The platform hosts an interactive guide to the protocol at http://sswap.info/protocol.jsp, developer tools at http://sswap.info/developer.jsp, and a portal to third-party ontologies at http://sswapmeet.sswap.info (a "swap meet". Conclusion SSWAP addresses the three basic requirements of a semantic web services architecture (i.e., a common syntax, shared semantic, and semantic discovery while addressing three technology limitations common in distributed service systems: i.e., i the fatal mutability of traditional interfaces, ii the rigidity and fragility of static

  5. Architecture-Based Reliability Analysis of Web Services

    Science.gov (United States)

    Rahmani, Cobra Mariam

    2012-01-01

    In a Service Oriented Architecture (SOA), the hierarchical complexity of Web Services (WS) and their interactions with the underlying Application Server (AS) create new challenges in providing a realistic estimate of WS performance and reliability. The current approaches often treat the entire WS environment as a black-box. Thus, the sensitivity…

  6. Planning and monitoring the execution of web service requests

    NARCIS (Netherlands)

    Lazovik, Alexander; Aiello, Marco; Papazoglou, Mike

    2006-01-01

    Interaction with web services enabled marketplaces would be greatly facilitated if users were given a high level service request language to express their goals in complex business domains. This can be achieved by using a planning framework which monitors the execution of planned goals against prede

  7. 3PAC: Enforcing Access Policies for Web Services

    NARCIS (Netherlands)

    van Bemmel, J.; Wegdam, M.; Lagerberg, K.

    Web Services fail to deliver on the promise of ubiquitous deployment and seamless interoperability due to the lack of a uniform, standards-based approach to all aspects of security. In particular, the enforcement of access policies in a Service Oriented Architecture is not addressed adequately. We

  8. 3PAC: Enforcing Access Policies for Web Services

    NARCIS (Netherlands)

    van Bemmel, J.; Wegdam, M.; Lagerberg, K.

    2005-01-01

    Web Services fail to deliver on the promise of ubiquitous deployment and seamless interoperability due to the lack of a uniform, standards-based approach to all aspects of security. In particular, the enforcement of access policies in a Service Oriented Architecture is not addressed adequately. We p

  9. Finding, Browsing and Getting Data Easily Using SPDF Web Services

    Science.gov (United States)

    Candey, R.; Chimiak, R.; Harris, B.; Johnson, R.; Kovalick, T.; Lal, N.; Leckner, H.; Liu, M.; McGuire, R.; Papitashvili, N.; Roberts, A.

    2010-01-01

    The NASA GSFC Space Physics Data Facility (5PDF) provides heliophysics science-enabling information services for enhancing scientific research and enabling integration of these services into the Heliophysics Data Environment paradigm, via standards-based approach (SOAP) and Representational State Transfer (REST) web services in addition to web browser, FTP, and OPeNDAP interfaces. We describe these interfaces and the philosophies behind these web services, and show how to call them from various languages, such as IDL and Perl. We are working towards a "one simple line to call" philosophy extolled in the recent VxO discussions. Combining data from many instruments and missions enables broad research analysis and correlation and coordination with other experiments and missions.

  10. A Performance Evaluation of Mobile Web Services Security

    CERN Document Server

    Srirama, Satish Narayana; Prinz, Wolfgang

    2010-01-01

    It is now feasible to host basic web services on a smart phone due to the advances in wireless devices and mobile communication technologies. The market capture of mobile web services also has increased significantly, in the past years. While the applications are quite welcoming, the ability to provide secure and reliable communication in the vulnerable and volatile mobile ad-hoc topologies is vastly becoming necessary. Even though a lot of standardized security specifications like WS-Security, SAML exist for web services in the wired networks, not much has been analyzed and standardized in the wireless environments. In this paper we give our analysis of adapting some of the security standards, especially WS-Security to the cellular domain, with performance statistics. The performance latencies are obtained and analyzed while observing the performance and quality of service of our Mobile Host.

  11. Operational Use of OGC Web Services at the Met Office

    Science.gov (United States)

    Wright, Bruce

    2010-05-01

    The Met Office has adopted the Service-Orientated Architecture paradigm to deliver services to a range of customers through Rich Internet Applications (RIAs). The approach uses standard Open Geospatial Consortium (OGC) web services to provide information to web-based applications through a range of generic data services. "Invent", the Met Office beta site, is used to showcase Met Office future plans for presenting web-based weather forecasts, product and information to the public. This currently hosts a freely accessible Weather Map Viewer, written in JavaScript, which accesses a Web Map Service (WMS), to deliver innovative web-based visualizations of weather and its potential impacts to the public. The intention is to engage the public in the development of new web-based services that more accurately meet their needs. As the service is intended for public use within the UK, it has been designed to support a user base of 5 million, the analysed level of UK web traffic reaching the Met Office's public weather information site. The required scalability has been realised through the use of multi-tier tile caching: - WMS requests are made for 256x256 tiles for fixed areas and zoom levels; - a Tile Cache, developed in house, efficiently serves tiles on demand, managing WMS request for the new tiles; - Edge Servers, externally hosted by Akamai, provide a highly scalable (UK-centric) service for pre-cached tiles, passing new requests to the Tile Cache; - the Invent Weather Map Viewer uses the Google Maps API to request tiles from Edge Servers. (We would expect to make use of the Web Map Tiling Service, when it becomes an OGC standard.) The Met Office delivers specialist commercial products to market sectors such as transport, utilities and defence, which exploit a Web Feature Service (WFS) for data relating forecasts and observations to specific geographic features, and a Web Coverage Service (WCS) for sub-selections of gridded data. These are locally rendered as maps or

  12. Semantic Web Services Challenge, Results from the First Year. Series: Semantic Web And Beyond, Volume 8.

    Science.gov (United States)

    Petrie, C.; Margaria, T.; Lausen, H.; Zaremba, M.

    Explores trade-offs among existing approaches. Reveals strengths and weaknesses of proposed approaches, as well as which aspects of the problem are not yet covered. Introduces software engineering approach to evaluating semantic web services. Service-Oriented Computing is one of the most promising software engineering trends because of the potential to reduce the programming effort for future distributed industrial systems. However, only a small part of this potential rests on the standardization of tools offered by the web services stack. The larger part of this potential rests upon the development of sufficient semantics to automate service orchestration. Currently there are many different approaches to semantic web service descriptions and many frameworks built around them. A common understanding, evaluation scheme, and test bed to compare and classify these frameworks in terms of their capabilities and shortcomings, is necessary to make progress in developing the full potential of Service-Oriented Computing. The Semantic Web Services Challenge is an open source initiative that provides a public evaluation and certification of multiple frameworks on common industrially-relevant problem sets. This edited volume reports on the first results in developing common understanding of the various technologies intended to facilitate the automation of mediation, choreography and discovery for Web Services using semantic annotations. Semantic Web Services Challenge: Results from the First Year is designed for a professional audience composed of practitioners and researchers in industry. Professionals can use this book to evaluate SWS technology for their potential practical use. The book is also suitable for advanced-level students in computer science.

  13. 一种基于信任推理与演化的Web服务组合策略%A Web Services Composition Strategy Based on Trust Reasoning and Evolution

    Institute of Scientific and Technical Information of China (English)

    龙军; 刘昕民; 袁鑫攀; 张祖平; 桂卫华

    2012-01-01

    为解决动态复杂互联网中恶意、欺诈、不诚信服务实体造成的服务组合质量不高的难题,文中基于开放网格服务体系架构(OGSA),建立了以公共信任演化系统和实体信任演化系统为主体构成的信任推理与演化系统;提出了受限于可信实体的信任演化、实体集合的信任演化、逐步逼近评价实体的信任演化等信任演化方法,以改变信任推理中的信任缺失与信任泛化的不足;通过服务实体间信任关系的推导、反演与递推,极大程度地丰富了实体的信任关系,以识别共谋欺骗并克服信任演化中直接信任关系稀小、前期信任匮乏的问题.文中以新的信任推理与演化为基础,提出了一种Web服务组合策略.应用实例及测试结果表明该服务组合策略能够有效地识别实体行为中潜在的风险,克服实体经验差异,较大幅度地提高了服务组合的成功率.%To overcome the problem of poor quality of service caused by malice, fraud and dishonest service entities in dynamic and complex internet, the paper constructs a trust reasoning and evolution system. It is mainly composed of the public and entity trust evolution systems and based on the Open Grid Services Architecture (OGSA). This paper proposes a trust reasoning method to change the situation of trust missing and trust generalization, which constrained by the trusty entities, the entity set, successive approximation of evaluation entities, etc. The trust reasoning system could greatly enrich trust relationship among entities and distinguish conspiracy through deduction, inversion and recursion. It is capable of overcoming the problem aroused by the lack of direct trust and early stage trust in the traditional trust evolution. Therefore, it changes traditional methodology on trust relationship modeling. Based on the new trust reasoning and evolution method, we propose a Web service composition strategy. The practical example and

  14. Pragmatics Driven Land Cover Service Composition Utilizing Behavior-Intention Model

    Science.gov (United States)

    Wu, Hao; Chen, Jun; Xing, Huaqiao; Li, Songnian; Hu, Juju

    2016-06-01

    Web service composition is one of the key issues to develop a global land cover (GLC) information service portal. Aiming at the defect that traditional syntax and semantic service compositionare difficult to take pragmatic information into account, the paper firstly analyses three tiers of web service language and their succession relations, discusses the conceptual model of pragmatic web service, and proposes the idea of pragmatics-oriented adaptive composition method based on the analysis of some examples. On this basis it puts forward the pragmatic web service model based on Behavior-Intention through presetting and expression of service usability, users' intention, and other pragmatic information, develops the on-demand assembly method based on the agent theory and matching and reconstruction method on heterogeneous message, solves the key technological issue of algorithm applicability and heterogeneous message transformation in the process of covering web service composition on the ground, applies these methods into service combination, puts forward the pragmatic driven service composition method based on behavior-intention model, and effectively settles the issue of coordination and interaction of composite service invocation.

  15. PRAGMATICS DRIVEN LAND COVER SERVICE COMPOSITION UTILIZING BEHAVIOR-INTENTION MODEL

    Directory of Open Access Journals (Sweden)

    H. Wu

    2016-06-01

    Full Text Available Web service composition is one of the key issues to develop a global land cover (GLC information service portal. Aiming at the defect that traditional syntax and semantic service compositionare difficult to take pragmatic information into account, the paper firstly analyses three tiers of web service language and their succession relations, discusses the conceptual model of pragmatic web service, and proposes the idea of pragmatics-oriented adaptive composition method based on the analysis of some examples. On this basis it puts forward the pragmatic web service model based on Behavior-Intention through presetting and expression of service usability, users' intention, and other pragmatic information, develops the on-demand assembly method based on the agent theory and matching and reconstruction method on heterogeneous message, solves the key technological issue of algorithm applicability and heterogeneous message transformation in the process of covering web service composition on the ground, applies these methods into service combination, puts forward the pragmatic driven service composition method based on behavior-intention model, and effectively settles the issue of coordination and interaction of composite service invocation.

  16. Bioinformatics Data Distribution and Integration via Web Services and XML

    Institute of Scientific and Technical Information of China (English)

    Xiao Li; Yizheng Zhang

    2003-01-01

    It is widely recognized that exchange, distribution, and integration of biological data are the keys to improve bioinformatics and genome biology in post-genomic era. However, the problem of exchanging and integrating biological data is not solved satisfactorily. The eXtensible Markup Language (XML) is rapidly spreading as an emerging standard for structuring documents to exchange and integrate data on the World Wide Web (WWW). Web service is the next generation of WWW and is founded upon the open standards of W3C (World Wide Web Consortium)and IETF (Internet Engineering Task Force). This paper presents XML and Web Services technologies and their use for an appropriate solution to the problem of bioinformatics data exchange and integration.

  17. A Generic Evaluation Model for Semantic Web Services

    Science.gov (United States)

    Shafiq, Omair

    Semantic Web Services research has gained momentum over the last few Years and by now several realizations exist. They are being used in a number of industrial use-cases. Soon software developers will be expected to use this infrastructure to build their B2B applications requiring dynamic integration. However, there is still a lack of guidelines for the evaluation of tools developed to realize Semantic Web Services and applications built on top of them. In normal software engineering practice such guidelines can already be found for traditional component-based systems. Also some efforts are being made to build performance models for servicebased systems. Drawing on these related efforts in component-oriented and servicebased systems, we identified the need for a generic evaluation model for Semantic Web Services applicable to any realization. The generic evaluation model will help users and customers to orient their systems and solutions towards using Semantic Web Services. In this chapter, we have presented the requirements for the generic evaluation model for Semantic Web Services and further discussed the initial steps that we took to sketch such a model. Finally, we discuss related activities for evaluating semantic technologies.

  18. 一种基于认知模型检测的Web服务组合验证方法%A Verification Approach for Web Service Compositions Based on Epistemic Model Checking

    Institute of Scientific and Technical Information of China (English)

    骆翔宇; 谭征; 苏开乐; 吴立军

    2011-01-01

    近几年Web服务组合的形式化验证逐渐成为研究热点.模型检测作为形式化验证的一种主流技术,可以克服传统软件测试用例生成不完备的不足,同时具有验证自动化的优点.该文提出并实现了一种Web服务组合的认知模型检测方法,将Web服务组合建模为多主体系统,在分析BPEL语言控制流程基础上,提出BPEL活动的形式化模型,给出活动执行语义.进而以迁移七元组为中间形式,开发从BPEL流程到迁移七元组集合以及从这些迁移七元组到MCTK(一种我们开发的多主体系统模型检测工具)输入语言的自动转换算法,最终通过MCTK进行验证.实验结果表明开发的算法不仅可以有效验证Web服务组合的时态逻辑规范,而且可以验证多主体系统特有的认知逻辑规范及其时态组合.%In recent years, the formal verification of Web service compositions is gradually becoming a hot research area. As a mainstream technique for formal verification, model checking is able to not only overcome the shortcoming of traditional software test techniques that they cannot generate the complete set of test cases, but also automatizes the verification process. In this paper, the authors propose and implement an epistemic model checking approach for the verification of Web service compositions by modeling them as multi-agent systems. After analyzing the BPEL control flow, the authors first propose a formal model for the BPEL activities and give the semantics of the implementation of the BPEL activities. By taking the so-call transition seven-tuple as the intermediate form, the authors further develop two automatic transform algorithms, one converts the BPEL process to the set of seven-tuples and the other converts this set of seven-tuples to the input language of MCTK (a model checker for multi-agent systems developed by the authors), such that can finally implement the verification by MCTK. The experimental results show that

  19. CMS data quality monitoring web service

    Energy Technology Data Exchange (ETDEWEB)

    Tuura, L; Eulisse, G [Northeastern University, Boston, MA (United States); Meyer, A, E-mail: lat@cern.c, E-mail: giulio.eulisse@cern.c, E-mail: andreas.meyer@cern.c [DESY, Hamburg (Germany)

    2010-04-01

    A central component of the data quality monitoring system of the CMS experiment at the Large Hadron Collider is a web site for browsing data quality histograms. The production servers in data taking provide access to several hundred thousand histograms per run, both live in online as well as for up to several terabytes of archived histograms for the online data taking, Tier-0 prompt reconstruction, prompt calibration and analysis activities, for re-reconstruction at Tier-1s and for release validation. At the present usage level the servers currently handle in total around a million authenticated HTTP requests per day. We describe the main features and components of the system, our implementation for web-based interactive rendering, and the server design. We give an overview of the deployment and maintenance procedures. We discuss the main technical challenges and our solutions to them, with emphasis on functionality, long-term robustness and performance.

  20. Validation and Classification of Web Services using Equalization Validation Classification

    Directory of Open Access Journals (Sweden)

    ALAMELU MUTHUKRISHNAN

    2012-12-01

    Full Text Available In the business process world, web services present a managed and middleware to connect huge number of services. Web service transaction is a mechanism to compose services with their desired quality parameters. If enormous transactions occur, the provider could not acquire the accurate data at the correct time. So it is necessary to reduce the overburden of web service t ransactions. In order to reduce the excess of transactions form customers to providers, this paper propose a new method called Equalization Validation Classification. This method introduces a new weight - reducing algorithm called Efficient Trim Down algorit hm to reduce the overburden of the incoming client requests. When this proposed algorithm is compared with Decision tree algorithms of (J48, Random Tree, Random Forest, AD Tree it produces a better accuracy and Validation than the existing algorithms. The proposed trimming method was analyzed with the Decision tree algorithms and the results implementation shows that the ETD algorithm provides better performance in terms of improved accuracy with Effective Validation. Therefore, the proposed method provide s a good gateway to reduce the overburden of the client requests in web services. Moreover analyzing the requests arrived from a vast number of clients and preventing the illegitimate requests save the service provider time

  1. Web Services 的安全性研究%Research on the Security in Web Services

    Institute of Scientific and Technical Information of China (English)

    牟连佳

    2008-01-01

    通过评测蕴涵于Web Services模型中的安全特征,揭示Web安全的潜能.讨论Web Services的安全规范,其次分析Web Services安全实施的各种情况,最后一部分讨论Web Services安全模型的未来发展.

  2. A Research on UCON Enhanced Dynamic Access Control Model for the Business Process of Composite Web Services%UCON支持的组合Web服务业务流程访问控制模型

    Institute of Scientific and Technical Information of China (English)

    上超望; 刘清堂; 赵呈领; 王艳凤; 杨琳

    2011-01-01

    Business process access control mechanism is a difficult problem in Web services composition application.The dynamic Interactivity and Coordination of business process activities have been ignored in the existing research,which can not meet the demands for the dynamic business process access control.An UCON enhanced business process dynamic access control model(WS-BPUCON) is proposed,which unbinds the coupling relationship of organization model and the process model,and provides sufficient flexibility to implement the dynamic and fine-gained access control based on the authorization,obligation and condition for business process.The paper also describes the implementation architecture of WS-BPUCON in the end.%业务流程访问控制机制是组合Web服务应用中的难点,现有的访问控制模型忽视了流程活动之间动态交互性和协同性的特点,不能适应业务流程权限的动态管理.本文提出一种使用控制支持的组合Web服务业务流程动态访问控制模型WS-BPUCON,模型通过角色和权限的分离解除了组织模型和业务流程模型的耦合关系,能够根据分布式开放网络环境中的属性信息,基于授权、职责和条件三种约束决定策略来检查访问控制决策,具有上下文感知、细粒度访问管理等特性,给出了WS-BPUCON的实施框架.

  3. Real-time medical collaboration services over the web.

    Science.gov (United States)

    Andrikos, Christos; Rassias, Georgios; Tsanakas, Panayiotis; Maglogiannis, Ilias

    2015-08-01

    The gradual shift in modern medical practice, from working alone clinical doctors to MDTs (Multi-Disciplinary Teams), raises the need of online real-time collaboration among geographically distributed medical personnel. The paper presents a Web-based platform, featuring an efficient medical data management and exchange, for hosting real-time collaborative services. The presented work leverages state-of-the-art features of the web (technologies and APIs) to support client-side medical data processing. Moreover, to address the typical bandwidth bottleneck and known scalability issues of centralized data sharing, an indirect RPC (Remote Process Call) scheme is introduced through object synchronization over the WebRTC paradigm.

  4. WebAUGUSTUS--a web service for training AUGUSTUS and predicting genes in eukaryotes.

    Science.gov (United States)

    Hoff, Katharina J; Stanke, Mario

    2013-07-01

    The prediction of protein coding genes is an important step in the annotation of newly sequenced and assembled genomes. AUGUSTUS is one of the most accurate tools for eukaryotic gene prediction. Here, we present WebAUGUSTUS, a web interface for training AUGUSTUS and predicting genes with AUGUSTUS. Depending on the needs of the user, WebAUGUSTUS generates training gene structures automatically. Besides a genome file, either a file with expressed sequence tags or a file with protein sequences is required for this step. Alternatively, it is possible to submit an externally generated training gene structure file and a genome file. The web service optimizes AUGUSTUS parameters and predicts genes with those parameters. WebAUGUSTUS is available at http://bioinf.uni-greifswald.de/webaugustus.

  5. The RCSB Protein Data Bank: redesigned web site and web services.

    Science.gov (United States)

    Rose, Peter W; Beran, Bojan; Bi, Chunxiao; Bluhm, Wolfgang F; Dimitropoulos, Dimitris; Goodsell, David S; Prlic, Andreas; Quesada, Martha; Quinn, Gregory B; Westbrook, John D; Young, Jasmine; Yukich, Benjamin; Zardecki, Christine; Berman, Helen M; Bourne, Philip E

    2011-01-01

    The RCSB Protein Data Bank (RCSB PDB) web site (http://www.pdb.org) has been redesigned to increase usability and to cater to a larger and more diverse user base. This article describes key enhancements and new features that fall into the following categories: (i) query and analysis tools for chemical structure searching, query refinement, tabulation and export of query results; (ii) web site customization and new structure alerts; (iii) pair-wise and representative protein structure alignments; (iv) visualization of large assemblies; (v) integration of structural data with the open access literature and binding affinity data; and (vi) web services and web widgets to facilitate integration of PDB data and tools with other resources. These improvements enable a range of new possibilities to analyze and understand structure data. The next generation of the RCSB PDB web site, as described here, provides a rich resource for research and education.

  6. Web Service Architecture for a Meta Search Engine

    Directory of Open Access Journals (Sweden)

    K.Srinivas

    2011-10-01

    Full Text Available With the rapid advancements in Information Technology, Information Retrieval on Internet is gaining its importance day by day. Nowadays there are millions of Websites and billions of homepages available on the Internet. Search Engines are the essential tools for the purpose of retrieving the required information from the Web. But the existing search engines have many problems such as not having wide scope, imbalance in accessing the sites etc. So, the effectiveness of a search engine plays a vital role. Meta search engines are such systems that can provide effective information by accessing multiple existing search engines such as Dog Pile, Meta Crawler etc, but most of them cannot successfully operate on heterogeneous and fully dynamic web environment. In this paper we propose a Web Service Architecture for Meta Search Engine to cater the need of heterogeneous and dynamic web environment. The objective of our proposal is to exploit most of the features offered by Web Services through the implementation of a Web Service Meta Search Engine.

  7. 75 FR 20400 - Submission for Review: Federal Cyber Service: Scholarship for Service (SFS) Registration Web Site

    Science.gov (United States)

    2010-04-19

    ... MANAGEMENT Submission for Review: Federal Cyber Service: Scholarship for Service (SFS) Registration Web Site... supporting documentation, may be obtained by contacting the San Antonio Services Branch, Office of Personnel... Science Foundation in accordance with the Federal Cyber Service Training and Education Initiative...

  8. A Sensor Web and Web Service-Based Approach for Active Hydrological Disaster Monitoring

    OpenAIRE

    Xi Zhai; Peng Yue; Mingda Zhang

    2016-01-01

    Rapid advancements in Earth-observing sensor systems have led to the generation of large amounts of remote sensing data that can be used for the dynamic monitoring and analysis of hydrological disasters. The management and analysis of these data could take advantage of distributed information infrastructure technologies such as Web service and Sensor Web technologies, which have shown great potential in facilitating the use of observed big data in an interoperable, flexible and on-demand way....

  9. Ubiquitous Computing Services Discovery and Execution Using a Novel Intelligent Web Services Algorithm

    Directory of Open Access Journals (Sweden)

    SangYong Han

    2007-07-01

    Full Text Available Ubiquitous Computing makes it possible to determine in real time the locationand situations of service requesters in a web service environment as it enables access tocomputers at any time and in any place. Though research on various aspects of ubiquitouscommerce is progressing at enterprises and research centers, both domestically andoverseas, analysis of a customer’s personal preferences based on semantic web and rulebased services using semantics is not currently being conducted. This paper proposes aUbiquitous Computing Services System that enables a rule based search as well assemantics based search to support the fact that the electronic space and the physical spacecan be combined into one and the real time search for web services and the construction ofefficient web services thus become possible.

  10. Contracts for Cooperation between Web Service Programmers and HTML Designers

    DEFF Research Database (Denmark)

    Böttger, Henning; Møller, Anders; Schwartzbach, Michael I.

    2006-01-01

    Interactive Web services consist of a mixture of HTML fragments and program code. The fragments, which are maintained by designers, are combined to form HTML pages that are shown to the clients. The code, which is maintained by programmers, is executed on the server to handle the business logic....... Current Web service frameworks provide little help in separating these constituents, which complicates cooperation between programmers and HTML designers. We propose a system based on XML templates and formalized contracts allowing a flexible separation of concerns. The contracts act as interfaces between...... the programmers and the HTML designers and permit tool support for statically checking that both parties fulfill their obligations. This ensures that (1) programmers and HTML designers work more independently focusing on their own expertises, (2) the Web service implementation is better structured and thus easier...

  11. Web Services-Enhanced Agile Modeling and Integrating Business Processes

    CERN Document Server

    Belouadha, Fatima-Zahra; Roudiès, Ounsa

    2012-01-01

    In a global business context with continuous changes, the enterprises have to enhance their operational efficiency, to react more quickly, to ensure the flexibility of their business processes, and to build new collaboration pathways with external partners. To achieve this goal, they must use e-business methods, mechanisms and techniques while capitalizing on the potential of new information and communication technologies. In this context, we propose a standards, model and Web services-based approach for modeling and integrating agile enterprise business processes. The purpose is to benefit from Web services characteristics to enhance the processes design and realize their dynamic integration. The choice of focusing on Web services is essentially justified by their broad adoption by enterprises as well as their capability to warranty interoperability between both intra and inter-enterprises systems. Thereby, we propose in this chapter a metamodel for describing business processes, and discuss their dynamic in...

  12. Contracts for Cooperation between Web Service Programmers and HTML Designers

    DEFF Research Database (Denmark)

    Böttger, Henning; Møller, Anders; Schwartzbach, Michael I.

    2006-01-01

    the programmers and the HTML designers and permit tool support for statically checking that both parties fulfill their obligations. This ensures that (1) programmers and HTML designers work more independently focusing on their own expertises, (2) the Web service implementation is better structured and thus easier......Interactive Web services consist of a mixture of HTML fragments and program code. The fragments, which are maintained by designers, are combined to form HTML pages that are shown to the clients. The code, which is maintained by programmers, is executed on the server to handle the business logic....... Current Web service frameworks provide little help in separating these constituents, which complicates cooperation between programmers and HTML designers. We propose a system based on XML templates and formalized contracts allowing a flexible separation of concerns. The contracts act as interfaces between...

  13. Approach to Enterprise Application Integration with Web Services

    Institute of Scientific and Technical Information of China (English)

    林春梅; 金鑫; 何跃; 陈家训

    2004-01-01

    Enterprise Application Integration (EAI) would be linking diverse systems and applications across the enterprise to enable the enterprise IT systems to adapt to the dynamic business environment and automate any business practices.Whereas, with traditional EAI solution, it is difficult to efficiently link the different proprietary applications and data sources, and difficult to enable the system to rapidly identify and respond to changes in the dynamic business environment. In order to solve these problems, this paper uses the Web Services technology for EAI. This paper discusses the traditional EAI technologies and the bottlenecks for applications integration, also elaborates the Web Services technology and the advantages suited for applications integration. Therefore, the model of EAI with Web Services (EAIWS) is proposed to efficiently implement the integration of diverse applications and systems within or between the enterprises. With EAIWS, this paper provides an example to show how the application system works. This paper also discusses the advantages of EAIWS.

  14. KBWS: an EMBOSS associated package for accessing bioinformatics web services.

    Science.gov (United States)

    Oshita, Kazuki; Arakawa, Kazuharu; Tomita, Masaru

    2011-04-29

    The availability of bioinformatics web-based services is rapidly proliferating, for their interoperability and ease of use. The next challenge is in the integration of these services in the form of workflows, and several projects are already underway, standardizing the syntax, semantics, and user interfaces. In order to deploy the advantages of web services with locally installed tools, here we describe a collection of proxy client tools for 42 major bioinformatics web services in the form of European Molecular Biology Open Software Suite (EMBOSS) UNIX command-line tools. EMBOSS provides sophisticated means for discoverability and interoperability for hundreds of tools, and our package, named the Keio Bioinformatics Web Service (KBWS), adds functionalities of local and multiple alignment of sequences, phylogenetic analyses, and prediction of cellular localization of proteins and RNA secondary structures. This software implemented in C is available under GPL from http://www.g-language.org/kbws/ and GitHub repository http://github.com/cory-ko/KBWS. Users can utilize the SOAP services implemented in Perl directly via WSDL file at http://soap.g-language.org/kbws.wsdl (RPC Encoded) and http://soap.g-language.org/kbws_dl.wsdl (Document/literal).

  15. KBWS: an EMBOSS associated package for accessing bioinformatics web services

    Directory of Open Access Journals (Sweden)

    Tomita Masaru

    2011-04-01

    Full Text Available Abstract The availability of bioinformatics web-based services is rapidly proliferating, for their interoperability and ease of use. The next challenge is in the integration of these services in the form of workflows, and several projects are already underway, standardizing the syntax, semantics, and user interfaces. In order to deploy the advantages of web services with locally installed tools, here we describe a collection of proxy client tools for 42 major bioinformatics web services in the form of European Molecular Biology Open Software Suite (EMBOSS UNIX command-line tools. EMBOSS provides sophisticated means for discoverability and interoperability for hundreds of tools, and our package, named the Keio Bioinformatics Web Service (KBWS, adds functionalities of local and multiple alignment of sequences, phylogenetic analyses, and prediction of cellular localization of proteins and RNA secondary structures. This software implemented in C is available under GPL from http://www.g-language.org/kbws/ and GitHub repository http://github.com/cory-ko/KBWS. Users can utilize the SOAP services implemented in Perl directly via WSDL file at http://soap.g-language.org/kbws.wsdl (RPC Encoded and http://soap.g-language.org/kbws_dl.wsdl (Document/literal.

  16. Web-based services for drug design and discovery.

    Science.gov (United States)

    Frey, Jeremy G; Bird, Colin L

    2011-09-01

    Reviews of the development of drug discovery through the 20(th) century recognised the importance of chemistry and increasingly bioinformatics, but had relatively little to say about the importance of computing and networked computing in particular. However, the design and discovery of new drugs is arguably the most significant single application of bioinformatics and cheminformatics to have benefitted from the increases in the range and power of the computational techniques since the emergence of the World Wide Web, commonly now referred to as simply 'the Web'. Web services have enabled researchers to access shared resources and to deploy standardized calculations in their search for new drugs. This article first considers the fundamental principles of Web services and workflows, and then explores the facilities and resources that have evolved to meet the specific needs of chem- and bio-informatics. This strategy leads to a more detailed examination of the basic components that characterise molecules and the essential predictive techniques, followed by a discussion of the emerging networked services that transcend the basic provisions, and the growing trend towards embracing modern techniques, in particular the Semantic Web. In the opinion of the authors, the issues that require community action are: increasing the amount of chemical data available for open access; validating the data as provided; and developing more efficient links between the worlds of cheminformatics and bioinformatics. The goal is to create ever better drug design services.

  17. Dynamic Web Services for Data Analysis in the Geosciences

    Science.gov (United States)

    Erlebacher, G.; Lu, Z.; Gadgil, H.; Bollig, E. F.; Kadlec, B. J.; Yuen, D. A.; Pierce, M.; Pallickara, S.

    2005-05-01

    Current large-scale multidisciplinary efforts involve a combination of computation, visualization, and data analysis over geographically distributed environments. There is an urgent need to develop easy to use middleware systems that can dynamically adjust themselves to the needs of the researchers, while at the same time shielding them from the underlying details. In this poster, we present a framework that supports fault tolerance, collaboration, and the automatic linkage of web services selected by the user at runtime. We address this problem through a a unique and flexible middleware architecture (WEBIS), based on the NaradaBrokering (NB) middleware application program interface (API) (http://www.naradabrokering.org, [1]). NB is based on a publish/subscribe mechanism whereby all messages are sent to a system with a topic tag, to be received by any entity that has subscribed to that tag. This simple approach enables natural implementation of resource discovery, fault tolerance, system monitoring, and collaboration. On the server side, there is an increasing number of so-called web services available, ranging from weather services to sophisticated GIS (Geographic Information Services) systems that provide clients with querying capability. These services adhere to existing standards and are fully described through a WSDL (Web Service Definition Language) file, many of which are publicly available. In this poster, we will demonstrate a proxy service whose role is to connect existing web services to our framework based on user requests. After selecting a desired web service from one or more registries, a user interface is created automatically based on the information contained in the WSDL file. This enables clients to interact with the service. This is illustrated through a service that computes the wavelet transform of three-dimensional scalar data files. The transformed data is processed by a second service that generates a bitmap (using the visualization

  18. 78 FR 60303 - Agency Information Collection Activities: Online Survey of Web Services Employers; New...

    Science.gov (United States)

    2013-10-01

    ... of Web Services Employers; New Information Collection ACTION: 30-Day Notice. SUMMARY: The Department... collection. (2) Title of the Form/Collection: Online Survey of Web Services Employers. (3) Agency form number... USCIS obtains data on the E-Verify Program Web Services. Gaining an understanding of the Web...

  19. Ubiquitous Computing Services Discovery and Execution Using a Novel Intelligent Web Services Algorithm

    OpenAIRE

    SangYong Han; Okkyung Choi

    2007-01-01

    Ubiquitous Computing makes it possible to determine in real time the location and situations of service requesters in a web service environment as it enables access to computers at any time and in any place. Though research on various aspects of ubiquitous commerce is progressing at enterprises and research centers, both domestically and overseas, analysis of a customer's personal preferences based on semantic web and rule based services using semantics is not currently being conducted. This ...

  20. A Web Service Based Design to Integrate a Web Portal and an ERP System

    Directory of Open Access Journals (Sweden)

    Mr. Manishkumar R. Solanki

    2014-04-01

    Full Text Available Today the ability to seamlessly exchange information between internal business processes, customers, and partners is vital for success. The organizations employ a variety of disparate applications that store and exchange data in dissimilar ways and therefore cannot "talk" to one another productively. Web services have evolved as a practical, cost-effective, deployment environment to realize dynamic and interoperable data integration between critical applications over operating system, platform, and language barriers that were previously impossible. This paper describes a service-oriented approach for the integration of a Web Portal and ERP application. We present a system architecture based on Web Service oriented framework in which both the applications are loosely connected through software components.

  1. Next generation of weather generators on web service framework

    Science.gov (United States)

    Chinnachodteeranun, R.; Hung, N. D.; Honda, K.; Ines, A. V. M.

    2016-12-01

    Weather generator is a statistical model that synthesizes possible realization of long-term historical weather in future. It generates several tens to hundreds of realizations stochastically based on statistical analysis. Realization is essential information as a crop modeling's input for simulating crop growth and yield. Moreover, they can be contributed to analyzing uncertainty of weather to crop development stage and to decision support system on e.g. water management and fertilizer management. Performing crop modeling requires multidisciplinary skills which limit the usage of weather generator only in a research group who developed it as well as a barrier for newcomers. To improve the procedures of performing weather generators as well as the methodology to acquire the realization in a standard way, we implemented a framework for providing weather generators as web services, which support service interoperability. Legacy weather generator programs were wrapped in the web service framework. The service interfaces were implemented based on an international standard that was Sensor Observation Service (SOS) defined by Open Geospatial Consortium (OGC). Clients can request realizations generated by the model through SOS Web service. Hierarchical data preparation processes required for weather generator are also implemented as web services and seamlessly wired. Analysts and applications can invoke services over a network easily. The services facilitate the development of agricultural applications and also reduce the workload of analysts on iterative data preparation and handle legacy weather generator program. This architectural design and implementation can be a prototype for constructing further services on top of interoperable sensor network system. This framework opens an opportunity for other sectors such as application developers and scientists in other fields to utilize weather generators.

  2. Semantic web services advancement through evaluation

    CERN Document Server

    Blake, Brian; König-Ries, Birgitta; Küster, Ulrich

    2012-01-01

    Including a useful overview of the latest research on implemented SWS technologies, this volume details a variety of current semantic service approaches and provides valuable material that will enhance future SWS evaluation methodologies and techniques.

  3. RESEARCH ON INTEROPERABILITY OF WEB SERVICES%Web Services 互操作性研究

    Institute of Scientific and Technical Information of China (English)

    郭皎; 鄢沛

    2008-01-01

    异构Web Services间的无缝互操作是成功构建基于Web Services应用的关键之一.讨论了Web Services互操作性概要和Web Services基本交互模式,详细分析了Web Services互操作原理和Web Services描述;说明了Web Services的类型定义中的类型不匹配、不可用类型、精度和值/引用类型等问题对互操作性的影响,并给出了处理方案;同时还分析了在Web Services的调用过程中采用的SOAP编码和消息模式、Web Services约束等问题.最后针对当前应用较广泛J2EE和.NET的两个平台的Web Services的互操作设计作了简要设计.

  4. System Interoperability Study for Healthcare Information System with Web Services

    Directory of Open Access Journals (Sweden)

    J. K. Zhang

    2007-01-01

    Full Text Available This paper describes the use of a new distributed middleware technology ‘Web Services’ in the proposed Healthcare Information System (HIS to address the issue of system interoperability raised from existing Healthcare Information systems. With the development of HISs, hospitals and healthcare institutes have been building their own HISs for processing massive healthcare data, such as, systems built up for hospitals under the NHS (National Health Service to manage patients’ records. Nowadays many healthcare providers are willing to integrate their systems’ functions and data for information sharing. This has raised concerns in data transmission, data security and network limitation. Among these issues, system and language interoperability are one of most obvious issues since data and application integration is not an easy task due to differences in programming languages, system platforms, Database Management Systems (DBMS used within different systems. As a new distributed middleware technology, Web service brings an ideal solution to the issue of system and language interoperability. Web service has been approved to be very successful in many commercial applications (e.g. Amazon.com, Dell computer, etc., however it is different to healthcare information system. As the result, Web Service-based Integrated Healthcare Information System (WSIHIS is proposed to address the interoperability issue of existing HISs but also to introduce this new technology into the healthcare environment.

  5. Automated Generation of Web Services for Visualization Toolkits

    Science.gov (United States)

    Jensen, P. A.; Yuen, D. A.; Erlebacher, G.; Bollig, E. F.; Kigelman, D. G.; Shukh, E. A.

    2005-12-01

    The recent explosion in the size and complexity of geophysical data and an increasing trend for collaboration across large geographical areas demand the use of remote, full featured visualization toolkits. As the scientific community shifts toward grid computing to handle these increased demands, new web services are needed to assemble powerful distributed applications. Recent research has established the possibility of converting toolkits such as VTK [1] and Matlab [2] into remote visualization services. We are investigating an automated system to allow these toolkits to export their functions as web services under the standardized protocols SOAP and WSDL using pre-existing software (gSOAP [3]) and a custom compiler for Tcl-based scripts. The compiler uses a flexible parser and type inferring mechanism to convert the Tcl into a C++ program that allows the desired Tcl procedures to be exported as SOAP-accessible functions and the VTK rendering window to be captured offscreen and encapsulated for forwarding through a web service. Classes for a client-side Java applet to access the rendering window remotely are also generated. We will use this system to demonstrate the streamlined generation of a standards-compliant web service (suitable for grid deployment) from a Tcl script for VTK. References: [1] The Visualization Toolkit, http://www.vtk.org [2] Matlab, http://www.mathworks.com [3] gSOAP, http://www.cs.fsu.edu/~engelen/soap.html

  6. Deploying and sharing U-Compare workflows as web services.

    Science.gov (United States)

    Kontonatsios, Georgios; Korkontzelos, Ioannis; Kolluru, Balakrishna; Thompson, Paul; Ananiadou, Sophia

    2013-02-18

    U-Compare is a text mining platform that allows the construction, evaluation and comparison of text mining workflows. U-Compare contains a large library of components that are tuned to the biomedical domain. Users can rapidly develop biomedical text mining workflows by mixing and matching U-Compare's components. Workflows developed using U-Compare can be exported and sent to other users who, in turn, can import and re-use them. However, the resulting workflows are standalone applications, i.e., software tools that run and are accessible only via a local machine, and that can only be run with the U-Compare platform. We address the above issues by extending U-Compare to convert standalone workflows into web services automatically, via a two-click process. The resulting web services can be registered on a central server and made publicly available. Alternatively, users can make web services available on their own servers, after installing the web application framework, which is part of the extension to U-Compare. We have performed a user-oriented evaluation of the proposed extension, by asking users who have tested the enhanced functionality of U-Compare to complete questionnaires that assess its functionality, reliability, usability, efficiency and maintainability. The results obtained reveal that the new functionality is well received by users. The web services produced by U-Compare are built on top of open standards, i.e., REST and SOAP protocols, and therefore, they are decoupled from the underlying platform. Exported workflows can be integrated with any application that supports these open standards. We demonstrate how the newly extended U-Compare enhances the cross-platform interoperability of workflows, by seamlessly importing a number of text mining workflow web services exported from U-Compare into Taverna, i.e., a generic scientific workflow construction platform.

  7. ballaxy: web services for structural bioinformatics.

    Science.gov (United States)

    Hildebrandt, Anna Katharina; Stöckel, Daniel; Fischer, Nina M; de la Garza, Luis; Krüger, Jens; Nickels, Stefan; Röttig, Marc; Schärfe, Charlotta; Schumann, Marcel; Thiel, Philipp; Lenhof, Hans-Peter; Kohlbacher, Oliver; Hildebrandt, Andreas

    2015-01-01

    Web-based workflow systems have gained considerable momentum in sequence-oriented bioinformatics. In structural bioinformatics, however, such systems are still relatively rare; while commercial stand-alone workflow applications are common in the pharmaceutical industry, academic researchers often still rely on command-line scripting to glue individual tools together. In this work, we address the problem of building a web-based system for workflows in structural bioinformatics. For the underlying molecular modelling engine, we opted for the BALL framework because of its extensive and well-tested functionality in the field of structural bioinformatics. The large number of molecular data structures and algorithms implemented in BALL allows for elegant and sophisticated development of new approaches in the field. We hence connected the versatile BALL library and its visualization and editing front end BALLView with the Galaxy workflow framework. The result, which we call ballaxy, enables the user to simply and intuitively create sophisticated pipelines for applications in structure-based computational biology, integrated into a standard tool for molecular modelling.  ballaxy consists of three parts: some minor modifications to the Galaxy system, a collection of tools and an integration into the BALL framework and the BALLView application for molecular modelling. Modifications to Galaxy will be submitted to the Galaxy project, and the BALL and BALLView integrations will be integrated in the next major BALL release. After acceptance of the modifications into the Galaxy project, we will publish all ballaxy tools via the Galaxy toolshed. In the meantime, all three components are available from http://www.ball-project.org/ballaxy. Also, docker images for ballaxy are available at https://registry.hub.docker.com/u/anhi/ballaxy/dockerfile/. ballaxy is licensed under the terms of the GPL. © The Author 2014. Published by Oxford University Press. All rights reserved. For

  8. A Web Service Monitoring System for the Enterprise

    Directory of Open Access Journals (Sweden)

    Coimbatore S. Chandersekaran

    2012-04-01

    Full Text Available An enterprise that uses web services for the conduct of business can benefit from computer-based monitoring for its normal course of business. Services that are unavailable, delayed, inadequate, and/or provide poor or delayed information flow, all hinder or prevent the normal course of business. In extreme cases they may prevent business from being conducted. The proper performance of the service-oriented approach, the communication flow and the services themselves directly equate to the health and vitality of the enterprise. By health we mean, availability, performance, integrity, and reliability of web services. This paper reviews an agent based approach for web service monitoring in an enterprise environment. The agents create and collect information about the services. The paper also provides a definition of events that need to be monitored and the elements that should be recorded. Some information about critical events is time critical and should be sent as alerts to monitoring personnel for review and possible action. These processes are currently being implemented in a major defense enterprise.

  9. Web Service 接口描述语言WSDL

    Institute of Scientific and Technical Information of China (English)

    王晓华

    2003-01-01

    Web Service定义语言(Web Service Definition Language,WSDL)是一个建议性标准,用于描述Web Service的技术调用语法。WSDL定义了一套基于XML的语法,将Web Service描述为能够进行消息交换的服务访问点的集合,从而满足了这种需求。WSDL服务定义为分布式系统提供了可机器识别的SDK文档,并且可用于描述自动执行应用程序通信中涉及的细节。WSDL的当前版本是1.1,规范可以从:

  10. QoS-Aware Automatic Service Composition: A Graph View

    Institute of Scientific and Technical Information of China (English)

    Wei Jiang; Tian Wu; Song-Lin Hu; Zhi-Yong Liu

    2011-01-01

    In the research of service composition,it demands efficient algorithms that not only retrieve correct service compositions automatically from thousands of services but also satisfy the quality requirements of different service users.However,most approaches treat these two aspects as two separate problems,automatic service composition and service selection.Although the latest researches realize the restriction of this separate view and some specific methods are proposed,they still suffer from serious limitations in scalability and accuracy when addressing both requirements simultaneously.In order to cope with these limitations and efficiently solve the combined problem which is known as QoS-aware or QoS-driven automatic service composition problem,we propose a new graph search problem,single-source optimal directed acyclic graphs (DAGs),for the first time.This novel single-source optimal DAGs (SSOD) problem is similar to,but more general than the classical single-source shortest paths (SSSP) problem.In this paper,a new graph model of SSOD problem is proposed and a Sim-Dijkstra algorithm is presented to address the SSOD problem with the time complexity of O(n log n +m) (n and m are the number of nodes and edges in the graph respectively),and the proofs of its soundness.It is also directly applied to solve the QoS-aware automatic service composition problem,and a service composition tool named QSynth is implemented.Evaluations show that Sim-Dijkstra algorithm achieves superior scalability and efficiency with respect to a large variety of composition scenarios,even more efficient than our worklist algorithm that won the performance championship of Web Services Challenge 2009.

  11. Web services in third-generation service platforms

    NARCIS (Netherlands)

    Lagerberg, Ko; Plas, Dirk-Jaap; Wegdam, Maarten

    2002-01-01

    In third-generation (3G) networks, third-party service developers will have access to the mobile network resources using open network interfaces, such as the 3rd Generation Partnership Project's (3GPP's) Open Service Access (OSA). The service platforms that offer these interfaces provide interoperab

  12. BioMOBY: an open source biological web services proposal.

    Science.gov (United States)

    Wilkinson, Mark D; Links, Matthew

    2002-12-01

    BioMOBY is an Open Source research project which aims to generate an architecture for the discovery and distribution of biological data through web services; data and services are decentralised, but the availability of these resources, and the instructions for interacting with them, are registered in a central location called MOBY Central. BioMOBY adds to the web services paradigm, as exemplified by Universal Data Discovery and Integration (UDDI), by having an object-driven registry query system with object and service ontologies. This allows users to traverse expansive and disparate data sets where each possible next step is presented based on the data object currently in-hand. Moreover, a path from the current data object to a desired final data object could be automatically discovered using the registry. Native BioMOBY objects are lightweight XML, and make up both the query and the response of a simple object access protocol (SOAP) transaction.

  13. Consuming Web Services: A Yahoo! Newsfeed Reader

    Science.gov (United States)

    Dadashzadeh, Mohammad

    2010-01-01

    Service Oriented Architecture (SOA) shows demonstrable signs of simplifying software integration. It provides the necessary framework for building applications that can be integrated and can reduce the cost of integration significantly. Organizations are beginning to architect new integration solutions following the SOA approach. As such,…

  14. Discovering Land Cover Web Map Services from the Deep Web with JavaScript Invocation Rules

    Directory of Open Access Journals (Sweden)

    Dongyang Hou

    2016-06-01

    Full Text Available Automatic discovery of isolated land cover web map services (LCWMSs can potentially help in sharing land cover data. Currently, various search engine-based and crawler-based approaches have been developed for finding services dispersed throughout the surface web. In fact, with the prevalence of geospatial web applications, a considerable number of LCWMSs are hidden in JavaScript code, which belongs to the deep web. However, discovering LCWMSs from JavaScript code remains an open challenge. This paper aims to solve this challenge by proposing a focused deep web crawler for finding more LCWMSs from deep web JavaScript code and the surface web. First, the names of a group of JavaScript links are abstracted as initial judgements. Through name matching, these judgements are utilized to judge whether or not the fetched webpages contain predefined JavaScript links that may prompt JavaScript code to invoke WMSs. Secondly, some JavaScript invocation functions and URL formats for WMS are summarized as JavaScript invocation rules from prior knowledge of how WMSs are employed and coded in JavaScript. These invocation rules are used to identify the JavaScript code for extracting candidate WMSs through rule matching. The above two operations are incorporated into a traditional focused crawling strategy situated between the tasks of fetching webpages and parsing webpages. Thirdly, LCWMSs are selected by matching services with a set of land cover keywords. Moreover, a search engine for LCWMSs is implemented that uses the focused deep web crawler to retrieve and integrate the LCWMSs it discovers. In the first experiment, eight online geospatial web applications serve as seed URLs (Uniform Resource Locators and crawling scopes; the proposed crawler addresses only the JavaScript code in these eight applications. All 32 available WMSs hidden in JavaScript code were found using the proposed crawler, while not one WMS was discovered through the focused crawler

  15. A demanding web-based PACS supported by web services technology

    Science.gov (United States)

    Costa, Carlos M. A.; Silva, Augusto; Oliveira, José L.; Ribeiro, Vasco G.; Ribeiro, José

    2006-03-01

    During the last years, the ubiquity of web interfaces have pushed practically all PACS suppliers to develop client applications in which clinical practitioners can receive and analyze medical images, using conventional personal computers and Web browsers. However, due to security and performance issues, the utilization of these software packages has been restricted to Intranets. Paradigmatically, one of the most important advantages of digital image systems is to simplify the widespread sharing and remote access of medical data between healthcare institutions. This paper analyses the traditional PACS drawbacks that contribute to their reduced usage in the Internet and describes a PACS based on Web Services technology that supports a customized DICOM encoding syntax and a specific compression scheme providing all historical patient data in a unique Web interface.

  16. 基于推理机制的逻辑语言在Web服务组合机制中的应用%Application of the Logic Language Based on Reasoning Mechanism in Web Composite Service

    Institute of Scientific and Technical Information of China (English)

    赵莹映; 章韵

    2012-01-01

    在实际的网络应用中,相比客户端的形式,人们更希望能提供服务设施和应用程序的平台来自简单方便的网络浏览器.基于多阶段可用性的Web服务组合管理关键技术的研究成功,将解决目前服务组合管理中的许多关键问题.本文主要研究人工智能语言Prolog在该项目中的应用与发展,用情景演算理论作为推导理论,并用逻辑编程语言对服务内容加以描述,同时在Prolog的基础上扩展到对Golog语言的研究,并在此基础上针对Web服务需求做出了一些推论.%In practical network applications, compared to the form of the client, people prefer to the platform which provides the services facilities and application from a simple and convenient web browser.The success in doing the research about the web services portfolio management based on the availability of multi-stage will solve a variety of key problems in current environment.This text was aiming at the application and the development of the artificial intelligence language Prolog in the project, using the situation calculus as the scene theory and describing the service content with the logic programming language, at the same time, extending to the Golog language on the basis of Prolog to make some inferences on the web services.

  17. Structured Communication-Centered Programming for Web Services

    DEFF Research Database (Denmark)

    Carbone, Marco; Honda, Kohei; Yoshida, Nobuko

    2012-01-01

    This article relates two different paradigms of descriptions of communication behavior, one focusing on global message flows and another on end-point behaviors, using formal calculi based on session types. The global calculus, which originates from a Web service description language (W3C WS...

  18. A Placement Web-Service for Lifelong Learners

    NARCIS (Netherlands)

    Kalz, Marco

    2009-01-01

    Kalz, M. (2009). A Placement Web-Service for Lifelong Learners. Presentation held at the 9th International Conference on Knowledge Management and Knowledge Technologies. September, 2-4, 2009, Graz, Austria. You can embed this presentation from here http://slideshare.net/mkalz

  19. WSGB: A Web Service-Based Growing Book

    Science.gov (United States)

    Dow, C. R.; Huang, L. H.; Chen, K. H.; Chiu, J. C.; Lin, C. M.

    2006-01-01

    Growing Book refers to an electronic textbook that is co-developed, and has the ability to be constantly maintained, by groups of independent authors, thus creating a rich and ever-growing learning environment that can be conveniently accessible from anywhere. This work designs and implements a Web Service-based Growing Book that has the merits of…

  20. A web service based tool to plan atmospheric research flights

    Directory of Open Access Journals (Sweden)

    M. Rautenhaus

    2011-09-01

    Full Text Available We present a web service based tool for the planning of atmospheric research flights. The tool provides online access to horizontal maps and vertical cross-sections of numerical weather prediction data and in particular allows the interactive design of a flight route in direct relation to the predictions. It thereby fills a crucial gap in the set of currently available tools for using data from numerical atmospheric models for research flight planning. A distinct feature of the tool is its lightweight, web service based architecture, requiring only commodity hardware and a basic Internet connection for deployment. Access to visualisations of prediction data is achieved by using an extended version of the Open Geospatial Consortium Web Map Service (WMS standard, a technology that has gained increased attention in meteorology in recent years. With the WMS approach, we avoid the transfer of large forecast model output datasets while enabling on-demand generated visualisations of the predictions at campaign sites with limited Internet bandwidth. Usage of the Web Map Service standard also enables access to third-party sources of georeferenced data. We have implemented the software using the open-source programming language Python. In the present article, we describe the architecture of the tool. As an example application, we discuss a case study research flight planned for the scenario of the 2010 Eyjafjalla volcano eruption. Usage and implementation details are provided as Supplement.