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Fuyuki Ishikawa

 

Publications by Fuyuki Ishikawa (bibliography)

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2012
 
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Klein, Adrian, Ishikawa, Fuyuki and Honiden, Shinichi (2012): Towards network-aware service composition in the cloud. In: Proceedings of the 2012 International Conference on the World Wide Web 2012. pp. 959-968. Available online

Service-Oriented Computing (SOC) enables the composition of loosely coupled services provided with varying Quality of Service (QoS) levels. Selecting a (near-)optimal set of services for a composition in terms of QoS is crucial when many functionally equivalent services are available. With the advent of Cloud Computing, both the number of such services and their distribution across the network are rising rapidly, increasing the impact of the network on the QoS of such compositions. Despite this, current approaches do not differentiate between the QoS of services themselves and the QoS of the network. Therefore, the computed latency differs substantially from the actual latency, resulting in suboptimal QoS for service compositions in the cloud. Thus, we propose a network-aware approach that handles the QoS of services and the QoS of the network independently. First, we build a network model in order to estimate the network latency between arbitrary services and potential users. Our selection algorithm then leverages this model to find compositions that will result in a low latency given an employed execution policy. In our evaluation, we show that our approach efficiently computes compositions with much lower latency than current approaches.

© All rights reserved Klein et al. and/or ACM Press

 
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Wagner, Florian, Kloepper, Benjamin, Ishikawa, Fuyuki and Honiden, Shinichi (2012): Towards robust service compositions in the context of functionally diverse services. In: Proceedings of the 2012 International Conference on the World Wide Web 2012. pp. 969-978. Available online

Web service composition provides a means of customized and flexible integration of service functionalities. Quality-of-Service (QoS) optimization algorithms select services in order to adapt workflows to the non-functional requirements of the user. With increasing number of services in a workflow, previous approaches fail to achieve a sufficient reliability. Moreover, expensive ad-hoc replanning is required to deal with service failures. The major problem with such sequential application of planning and replanning is that it ignores the potential costs during the initial planning and they consequently are hidden from the decision maker. Our basic idea to overcome this substantial problem is to compute a QoS optimized selection of service clusters that includes a sufficient number of backup services for each service employed. To support the human decision maker in the service selection task, our approach considers the possible repair costs directly in the initial composition. On the basis of a multi-objective approach and using a suitable service selection interface, the decision maker can select compositions in line with his/her personal risk preferences.

© All rights reserved Wagner et al. and/or ACM Press

2008
 
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Takahashi, Ryuichi, Tei, Kenji, Ishikawa, Fuyuki, Fukazawa, Yoshiaki and Honiden, Shinichi (2008): A Flexible Protocol Composition for Multi-party Coordination Protocols in Multi-agent Systems. In: PerCom 2008 - Sixth Annual IEEE International Conference on Pervasive Computing and Communications 17-21 March, 2008, Hong Kong. pp. 609-614. Available online

 
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