Today’s microblogging services such as Twitter have long outgrown their initial designs as SMS-based social networks. Instead, a massive and steadily-growing user population of more than 100 million is using Twitter for everything from capturing the mood of the country to detecting earthquakes and Internet service failures. It is unsurprising that the traditional centralized client-server archi...

Today’s microblogging services such as Twitter have long outgrown their initial designs as SMS-based social networks. Instead, a massive and steadily-growing user population of more than 100 million is using Twitter for everything from capturing the mood of the country to detecting earthquakes and Internet service failures. It is unsurprising then, that the traditional centralized client-server...

Internet of things (IoTs) is the newfound information architecture based on the internet that develops interactions between objects and services in a secure and reliable environment. As the availability of many smart devices rises, secure and scalable mass storage systems for aggregate data is required in IoTs applications. In this paper, we propose a new method for storing aggregate data in Io...

Web-based Intelligent Tutoring Systems distribute content using a server based infrastructure. These systems need to be easily accessible to provide a reliable and scalable architecture for students, teachers, parents, content creators, and researchers. Scaling up web-based applications requires a well designed system that distributes the load accross multiple application servers and database s...

Today’s microblogging services such as Twitter have long outgrown their initial designs as SMSbased social networks. Instead, a massive and steadily-growing user population of more than 100 million is using Twitter for everything from capturing the mood of the country to detecting earthquakes and Internet service failures. It is unsurprising that the traditional centralized client-server archit...

The World Wide Web (WWW) has become an important medium for information dissemination. One model for synchronous information dissemination is a scheme called webcasting where data is simultaneously distributed to multiple destinations. The WWW's traditional unicast client/server communication model su ers, however, when applied to webcasting; solutions which require many clients to simultaneous...

The use of appropriate tools is crucial for the development of robust and distributed software. The programming of heterogeneous environments is more demanding than programming single, stand-alone computers. We believe that client/server technology is not a satisfactory solution. Most problems do not naturally decompose into an asymmetric client/server structure. Better abstraction mechanisms a...

The management policy of an M/G/1 queue with a single removable and non-reliable server is considered. The decision-maker can turn the single server on at any arrival epoch or off at any service completion. It is assumed that the server breaks down according to a Poisson process and the repair time has a general distribution. Arrivals form a Poisson process and service times are generally distr...