Challenges to describe QoS requirements for web services quality prediction to support web services interoperability in electronic commerce

Quality of service (QoS) is significant and necessary for web service applications quality assurance. Furthermore, web services quality has contributed to the successful implementation of Electronic Commerce (EC) applications. However, QoS is still the big issue for web services research and remains one of the main research questions that need to be explored. We believe that QoS should not only be measured but should also be predicted during the development and implementation stages. However, there are challenges and constraints to determine and choose QoS requirements for high quality web services. Therefore, this paper highlights the challenges for the QoS requirements prediction as they are not easy to identify. Moreover, there are many different perspectives and purposes of web services, and various prediction techniques to describe QoS requirements. Additionally, the paper introduces a metamodel as a concept of what makes a good web service

Sharing and viewing segments of electronic patient records service (SVSEPRS) using multidimensional database model

This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.The concentration on healthcare information technology has never been determined than it is today. This awareness arises from the efforts to accomplish the extreme utilization of Electronic Health Record (EHR). Due to the greater mobility of the population, EHR will be constructed and continuously updated from the contribution of one or many EPRs that are created and stored at different healthcare locations such as acute Hospitals, community services, Mental Health and Social Services. The challenge is to provide healthcare professionals, remotely among heterogeneous interoperable systems, with a complete view of the selective relevant and vital EPRs fragments of each patient during their care. Obtaining extensive EPRs at the point of delivery, together with ability to search for and view vital, valuable, accurate and relevant EPRs fragments can be still challenging. It is needed to reduce redundancy, enhance the quality of medical decision making, decrease the time needed to navigate through very high number of EPRs, which consequently promote the workflow and ease the extra work needed by clinicians. These demands was evaluated through introducing a system model named SVSEPRS (Searching and Viewing Segments of Electronic Patient Records Service) to enable healthcare providers supply high quality and more efficient services, redundant clinical diagnostic tests. Also inappropriate medical decision making process should be avoided via allowing all patients‟ previous clinical tests and healthcare information to be shared between various healthcare organizations. Multidimensional data model, which lie at the core of On-Line Analytical Processing (OLAP) systems can handle the duplication of healthcare services. This is done by allowing quick search and access to vital and relevant fragments from scattered EPRs to view more comprehensive picture and promote advances in the diagnosis and treatment of illnesses. SVSEPRS is a web based system model that helps participant to search for and view virtual EPR segments, using an endowed and well structured Centralised Multidimensional Search Mapping (CMDSM). This defines different quantitative values (measures), and descriptive categories (dimensions) allows clinicians to slice and dice or drill down to more detailed levels or roll up to higher levels to meet clinicians required fragment

Mechanisms for quality of service in Web clusters

The new generation of Web systems provides more complex services than those related to Web publishing sites. Users are increasingly reliant on the Web for up-to-date personal and business information and services. Web architectures able to guarantee the quality of service (QoS) that rules the relationship between users and Web service providers require a large investment in new algorithms and systems for dispatching, load balancing, and information consistency. In this paper, we consider Web cluster architectures composed of multiple back-end server nodes and one front-end dispatcher and we analyze how to provide differentiated service levels to various classes of users. We demonstrate through simulation experiments under realistic workload models that the proposed mechanisms are able to satisfy QoS requirements of the most valuable users classes, without impacting too negatively on the other users

Mechanisms for quality of service in Web clusters

The new generation of Web systems provides more complex services than those related to Web publishing sites. Users are increasingly reliant on the Web for up-to-date personal and business information and services. Web architectures able to guarantee the quality of service (QoS) that rules the relationship between users and Web service providers require a large investment in new algorithms and systems for dispatching, load balancing, and information consistency. In this paper. we consider Web cluster architectures composed of multiple back-end server nodes and one front-end dispatcher and we analyze how to provide differentiated service levels to various classes of users. We demonstrate through simulation experiments under realistic workload models that the proposed mechanisms are able to satisfy QoS requirements of the most valuable users classes, without impacting too negatively on the other users. (C) 2001 Elsevier Science B.V. All rights reserved