Semantic-based policy engineering for autonomic systems

This paper presents some important directions in the use of ontology-based semantics in achieving the vision of Autonomic Communications. We examine the requirements of Autonomic Communication with a focus on the demanding needs of ubiquitous computing environments, with an emphasis on the requirements shared with Autonomic Computing. We observe that ontologies provide a strong mechanism for addressing the heterogeneity in user task requirements, managed resources, services and context. We then present two complimentary approaches that exploit ontology-based knowledge in support of autonomic communications: service-oriented models for policy engineering and dynamic semantic queries using content-based networks. The paper concludes with a discussion of the major research challenges such approaches raise

Twelve Theses on Reactive Rules for the Web

Reactivity, the ability to detect and react to events, is an essential functionality in many information systems. In particular, Web systems such as online marketplaces, adaptive (e.g., recommender) systems, and Web services, react to events such as Web page updates or data posted to a server. This article investigates issues of relevance in designing high-level programming languages dedicated to reactivity on the Web. It presents twelve theses on features desirable for a language of reactive rules tuned to programming Web and Semantic Web applications

Towards Developing Grid-based Portals for E-Commerce on-Demand Services on a Utility Computing Platform

Trends and current practices in the design and development of grid-enabled portals(GeP) reveal the need to identify and fulfill certain additional relevant requirements in order to build applicable and usable grid-enabled portals for evolving computing platforms such as the utility computing (UC). This paper reports an investigation of the minimum relevant additional requirements that must be fulfilled to attain effective GeP design for UC. A GeP prototype for the Grid-based Utility Infrastructure for Small, Micro, and Medium Enterprises (SMME) Enabling Technology (GUISET) initiative – a UC platform was developed, and an analytic evaluation experiment undertaken in the study to elicit these additional requirements using a set of benchmark requirements (standards) revealed that it fulfilled the minimum requirements to be suitable for UC context. The result of the study underlines the need for more controlled experiments in portal prototyping in order to foster the practice of GeP design for UC

A Change Execution System for Enterprise Services with Compensation Support

Modern enterprises rely on a distributed IT infrastructure to execute their business processes, adopting Service Oriented Architectures in order to improve the flexibility and ease of adaptation of their functions. Nowadays this is a vital characteristic, as the increased competition forces companies to continuously evolve and adapt. SOA applications must be supported by management and deployment systems, which have to continuously apply modifications to the distributed infrastructure. This article presents a modelbased solution for automatically applying change plans to heterogeneous enterprise managed environments. The proposed solution uses models which describe in an abstract language the changes that need to be applied to the environment, and executes all the required operations to the specific managed elements. Also, to ensure that the environment ends in a stable state, compensation for previously executed operations is supported. The validation results from a case study taken from the banking domain are also presented here

Energy-Efficient Management of Data Center Resources for Cloud Computing: A Vision, Architectural Elements, and Open Challenges

Cloud computing is offering utility-oriented IT services to users worldwide. Based on a pay-as-you-go model, it enables hosting of pervasive applications from consumer, scientific, and business domains. However, data centers hosting Cloud applications consume huge amounts of energy, contributing to high operational costs and carbon footprints to the environment. Therefore, we need Green Cloud computing solutions that can not only save energy for the environment but also reduce operational costs. This paper presents vision, challenges, and architectural elements for energy-efficient management of Cloud computing environments. We focus on the development of dynamic resource provisioning and allocation algorithms that consider the synergy between various data center infrastructures (i.e., the hardware, power units, cooling and software), and holistically work to boost data center energy efficiency and performance. In particular, this paper proposes (a) architectural principles for energy-efficient management of Clouds; (b) energy-efficient resource allocation policies and scheduling algorithms considering quality-of-service expectations, and devices power usage characteristics; and (c) a novel software technology for energy-efficient management of Clouds. We have validated our approach by conducting a set of rigorous performance evaluation study using the CloudSim toolkit. The results demonstrate that Cloud computing model has immense potential as it offers significant performance gains as regards to response time and cost saving under dynamic workload scenarios.Comment: 12 pages, 5 figures,Proceedings of the 2010 International Conference on Parallel and Distributed Processing Techniques and Applications (PDPTA 2010), Las Vegas, USA, July 12-15, 201

Towards Sustainable Production and Consumption: Preparedness for Product Service System Concept

Eco-efficiency strategies and policies, which have resulted in environmental gains that translate into increased resource efficiency and lower levels of emissions, in particular CO2 emissions along the life cycle of products and services, might be offset by rising levels of consumption on the demand side. Hence, both sides of the coin i.e. the system of production and consumption systems need to be assessed if more sustainable patterns are to be achieved. Establishing sustainable production and consumption systems can be possible via functional thinking practices. Functional thinking takes the focus from provision of resource intensive product to satisfaction of needs and wants through service systems, where material products are treated as capital assets rather than consumables. An application of functional thinking is the Product Service System (PSS) concept. Providers of PSS applications aim to generate profit not from selling as many material products as possible, but from providing a function of the product or service. Potential environmental benefits of PSS applications stemming from decreased use of virgin materials in production and lessened resource consumption at the use phase are being recognized. Applications of PSS can be seen in many sectors such as Information and Communication Technology (ICT), energy, transportation, food and in many forms such as remanufacturing, demand side management, chemical management services, car sharing schemes, functional designs, etc. However, supply and use of such applications might need considerable assessment of business practices and consumer behaviour. For business, designing and implementing PSS applications might require a new set of internal conditions such as shifting the business vision and adjusting the corporate culture to provision of functions. On the other hand, understanding of individual and social factors guiding the consumers' acceptance of PSS applications is required.This paper is an extract from a study, which is conducted with the aim of provision of a direction enhancing business ability to offer new or improved PSS applications with increased consumer acceptance and in turn enhanced resource efficiency. Applications in the Information and Communications Technology (ICT) sector are chosen as the focus of the paper. Although it is debated that this fast developing sector can potentially contribute to dematerialisation of systems, limitations within the sector still remain unclear. Here, it is aimed to suggest an overview of the aspects for business preparedness and consumer acceptance of PSS applications providing particular functions in the ICT sector. The focus is on the company level dynamics, despite it is recognized that factors of macro level preparedness such as infrastructure availability, economic and social conditions, public support, etc. are essential to consider for system preparedness