Debessay Fesehaye

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In this paper we analyze and study the impact of cloudlets in interactive mobile cloud applications. To study the impact we propose the design of cloudlet network and service architectures. Our study focuses on file editing, video streaming and collaborative chatting which are representative enterprise application scenarios. Initial simulation results show(More)
This paper introduces the abstraction of energy reserves for sensor networks that virtualizes energy sources. It gives each of several applications sharing a platform the illusion of having its own private energy source. Energy virtualization is the next logical step in embedded systems after virtualizing communication links and CPU capacity. Energy(More)
We present a scalable NDN-based conferencing architecture for conference control and management. Conference control functions are divided into individual service modules and are loaded into different control servers. Control servers are added into the control cluster as the number of parcitipants increases. Participants are allowed to register and receive(More)
The transmission control protocol (TCP) is by far the dominant transport protocol in the Internet. Nonetheless many studies have shown that TCP has many performance problems with the fast growing Internet. As a result, new transport protocols have been proposed to solve the problems. In this paper the author present a simple and short proof that feedback(More)
With the fast growth of (online) content and the need for high quality content services, cloud data centers are increasingly becoming the preferred places to store data and retrieve it from. With a highly variable network traffic and limited resources, efficient server selection and data transfer rate allocation mechanisms become necessary. However, current(More)
The transmission control protocol (TCP) is the dominant transport layer protocol for the end-to-end control of information transfer. Accurate models of TCP performance are a key and basic step for designing, dimensioning and planning IP (Internet Protocol) networks. Packet-level simulation models do not scale with the growth of network capacities and number(More)
The feedback nature of reliable Internet protocols can be represented by a fixed point algorithm (FPA). The network signals congestion based on the aggregate traffic offered to it and each source adjusts its sending rate based on the feedback from the network to reach the network operating regime. The algorithms of reliable (transport) protocols are based(More)
Distributed systems have been widely deployed and used in different fields. The Internet itself with all the challenges it brings is one of the successful distributed systems. There have been a lot of research in the efficient design, implementation and evaluation of distributed systems. One of the research challenges in distributed systems is the design of(More)
Applications like Twitter which use chat-like short messaging systems (SMS) have been widely used in public, political, military, emergency, humanitarian and other fields. Such applications usually involve servers (controllers) which control and forward messages from a sending client to a receiving client. The use of mobile wireless networks for such(More)