Cloud computing is a recent trend of technology that aims to provide on-demand services following a pay-peruse model. In the cloud, the service user has some guarantees, such as performance and availability. These guarantees of quality of service are defined between the service provider and user and are expressed through a service level agreement. There are many models for agreement and quality...

This paper presents our research progress for group context-aware service discovery supporting continuous service availability by providing an alternative service. We believe that service discovery system need to have efficient method for representing the context of a service and a good algorithm for matching and evaluation. We adopt IOPE model from Semantic Web to represent service context and...

The Domain Name system (DNS) has become a ubiquitous part of modern internet infrastructure that maps numeric IP address to human-readable names. In the recent years, denial of service (DoS) attacks on DNS has a trend to be more serious problems. These attack is mainly related the hierarchical namespace architecture, which is hard to avoid as this architecture are widely deployment in multi-lev...

This work aims to pave the way for high availability in high-performance computing (HPC) by focusing on efficient redundancy strategies for head and service nodes. These nodes represent single points of failure and control for an entire HPC system as they render it inaccessible and unmanageable in case of a failure until repair. The presented approach introduces two distinct replication methods...

background in early 2012, national health insurance scheme (nhis) members in ashanti region were allowed to choose their own primary healthcare providers. this paper investigates the factors that enrolees in the ashanti region considered in choosing preferred primary healthcare providers (ppps) and direction of association of such factors with the choice of ppp.   methods using a cross-sectiona...

This paper addresses a rationing problem in a two-level, vertically integrated distribution system composed of one manufacturer and several retail points. The motivating case, developed in the vending machine sector and modeled as a newsvendor-like problem, is representative of many real settings where short-term changes in demand can be substantial while capacity modification is not a viable o...

Due to the rapid increase in the number of available web services, more and more emphasis is put on their reliability, availability, security, etc. These non-functional requirements are frequently captured in service-level agreements between service requesters and providers. In order to meet such non-functional requirements, a service needs to be designed for reliability by making design decisi...

Lately, the evolution of information technologies has been following two trends. On the one handthe proliferation of communicating devices contributes to the creation of an ambient intelligence.On the other hand, the booming of Internet associated with the rapid growth of data centrescapabilities results in the emergence of an internet of services. In both domains, application desig...