Contract-driven creation and operation of virtual enterprises

Hoffner, Yigal; Field, Simon; Grefen, Paul; Ludwig, Heiko

doi:10.1016/s1389-1286(01)00210-9

Cited by 86 publications

(49 citation statements)

References 13 publications

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“…In general, they only allow to define an unique validity period for an entire demand or offer. Fortunately, other proposals do allow to assign a validity period to every condition of a demand or an offer, such as the IBM WSLA Web Services Level Agreement language [6,11] and the WSOL Web Service Offerings Language [23]. The HP WSML Web Services Level Agreement Management language [19] allows to specify both a single validity period for the entire agreement and also a periodic temporal interval to every condition.…”

Section: Proposals Based On Ad-hoc Formalismsmentioning

confidence: 99%

An Approach to Temporal-Aware Procurement of Web Services

Martín–Díaz

Ruiz–Cortés

Durán

et al. 2005

Service-Oriented Computing – ICSOC 2007

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Abstract. In the context of web service procurement (WSP), temporal-awareness refers to managing service demands and offers which are subject to validity periods, i.e. their evaluation depends not only on quality of service (QoS) values but also on time. For example, the QoS of some web services can be considered critical in working hours (9:00 to 17:00 from Monday to Friday) and irrelevant at any other moment. Until now, the expressiveness of such temporal-aware specifications has been quite limited. As far as we know, most proposals have considered validity periods to be composed of a single temporal interval. Other proposals, which could allow more expressive time-dependent specifications, have not performed a detailed study about all the underlying complexities of such approach, in spite of the fact that dealing with complex expressions on temporality is not a trivial task at all. As a matter of fact, it requires a special design of the so-called procurement tasks (consistency and conformance checking, and optimal selection). In this paper, we present a constraint-based approach to temporal-aware WSP. Using constraints allows a great deal of expressiveness, so that not only demands and offers can be assigned validity periods but also their conditions can be assigned (possibly multiple) validity temporal subintervals. Apart from revising the semantics of procurement tasks, which we previously presented in the first edition of the ICSOC conferences, we also introduce the notion of the covering set of a demand, a topic which is closely related to temporality.

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Section: Proposals Based On Ad-hoc Formalismsmentioning

confidence: 99%

An Approach to Temporal-Aware Procurement of Web Services

Martín–Díaz

Ruiz–Cortés

Durán

et al. 2005

Service-Oriented Computing – ICSOC 2007

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“…Collaborative business process management encompasses the coordination of information flows among organisations as well as the composition of their business processes towards mutual benefits. The CrossFlow project proposes an approach to establish and enact workflow-based service outsourcing [8]. Flexible workflows are suggested to allow optimal performance of the overall business process, and similar to our approach Markov chains are used for the selection of the most optimal planning of the workflow execution.…”

Section: Related Workmentioning

confidence: 99%

Dynamic service contracting for on-demand asset delivery

Zhao

Angelov

Grefen

2014

Electron Commer Res

Self Cite

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Traditional financial asset lease operates in an asset provider centred mode, in which financiers passively provide financial solutions to the customers of their allied asset vendors. To capture the highly customised asset lease demands from the mass market, this paper advocates adopting a financier-led asset lease model shifting the asset lease to be customer-oriented. In this model, a financier evolves to a service integrator which can create highly customised lease options by buying proper assets from and outsourcing related services to the constituent organisations of a virtual asset network. To cater for the dynamics of the virtual asset network and customer requests, an asset delivery algorithm is proposed to ensure the on-demand asset delivery. Further, a service planning mechanism is established with a scheduling algorithm to automatically detect the changes of the business environment, and actively adapt the service outsourcing plans to these changes. Thereby, the financier can easily selects the most cost efficient outsourcing actions along the asset lease lifecycle. A hypothetical example has been conducted in the vehicle leasing domain to demonstrate how the two proposed mechanisms can be integrated to effectively and efficiently manage service outsourcing for on-demand asset delivery.

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“…-The IBM's Web Services Matchmaking Engine (WSME) [12], which is related to Web Service Level Agreement (WSLA) [15,17], is based on the CORBA/ODP trader service. It owns an asymmetric model and there is no optimation of the selection because search results are only the lists of conformant offers.…”

Section: Related Workmentioning

confidence: 99%

Automating the Procurement of Web Services

Martín–Díaz

Ruiz–Cortés

Durán

et al. 2003

Lecture Notes in Computer Science

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Abstract. As government agencies and business become more dependent on web services, software solutions to automate their procurement gain importance. Current approaches for automating the procurement of web services suffer from an important drawback: neither uncertainty measures nor non-linear, and complex relations among parameters can be used by providers to specify quality-ofservice in offers. In this paper, we look deeply into the roots of this drawback and present a proposal which overcomes it. The key point to achieve this improvement has been using the constraint programming as a formal basis, since it endows the model with a very powerful expressiveness. A XML-based implementation is presented along with some experimental results and comparisons with other approaches.

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Contract-driven creation and operation of virtual enterprises

Cited by 86 publications

References 13 publications

An Approach to Temporal-Aware Procurement of Web Services

An Approach to Temporal-Aware Procurement of Web Services

Dynamic service contracting for on-demand asset delivery

Automating the Procurement of Web Services

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