Internet services today are often deployed and operated in data centers and clouds; users access and use the services by connecting to such data centers from their computing devices. For availability, fault tolerance, and proximities to users at diverse regions, a service provider often needs to run the service at multiple data centers or clouds that are distributed at different geographic loca...

As users’ and companies’ dependence on shared, networked information services continues to increase, we will see continued growth in large data centers and service providers. This will happen both as new services arise, and as services and servers are consolidated on one hand (for ease of management, outsourcing, and reduced duplication), and further distributed on the other hand (for fault-tol...

Global-Scale Data Management (GSDM) empowers systems by providing higher levels of fault-tolerance, read availability, and efficiency in utilizing cloud resources. But, at which datacenters should data be placed? Current cloud providers offer tens of datacenters and hundreds of edge datacenters that are globally distributed all over the world. Unlike networks within a datacenter, the topology o...

With the widespread use of shared-nothing clusters of servers, there has been a proliferation of distributed object stores that offer high availability, reliability and enhanced performance for MapReducestyle workloads. However, relational workloads cannot always be evaluated efficiently using MapReduce without extensive data migrations, which cause network congestion and reduced query throughp...

The drive of this investigation is to diagnose the mediation effect of placement between program quality, industrial link, student satisfaction, and service quality in the circumstance of tertiary education in Malaysia. Using the Cue Utilization theory, the proposed model is tested employing data collected from 173 international students who are pursuing study at University Utara Malaysia throu...

recently many studies have been done on different issues of using multiple antennas at transmit and receive sides of a radar system in a mimo (multiple input multiple output) configuration. in addition, for the electronic warfare‟s purposes, the utilization of available signals of the environment to detect the targets has gained considerable attention in recent years. such passive radars use th...

many real world problems can be modelled as an optimization problem. evolutionary algorithms are used to solve these problems. ant colony algorithm is a class of evolutionary algorithms that have been inspired of some specific ants looking for food in the nature. these ants leave trail pheromone on the ground to mark good ways that can be followed by other members of the group. ant colony optim...

Multimedia data storage is a critical issue in large scale applications. This paper proposes a frequency based multimedia data representation model which effectively guides data storage and elevation among the secondary and tertiary storage levels. Multimedia data are stored on the tertiary storage level and (based on certain popularity criteria) they are elevated on secondary level towards imp...