l security perspective of Cloud computing with the aim to highlight the problem from the cloud stakeholders' perspective, and the cloud service delivery models perspective. The paper aims also to introduce the mechanisms used to secure cloud computing applications as well as to compare some providers of cloud computing field with each other in general and security aspects. 

neural network is considered as a nonlinear dynamic system consisting of a large number of simple processing elements interconnected in some manner with adjustable weighted strength. Neural networks provide qualitative and quantitative (analog, digital or logical) knowledge through information coding and decoding, and have powerful functions in learning and selforganization. These properties make neural networks considered to be more powerful in dealing with numerical data than other artificial intelligent systems like expert systems. However, the performance of neural networks depends deeply in number of factors including transfer function, number of hidden layers, number of nodes in hidden layers, input function, and weight function. In this article we present a comparative study of these factors and how they influence the performance of a system. 

echnology enhanced Learning

his paper provides a study to one of the web application and summarizes the concept of using dynamic websites in the Internet, so as to provide decision in education institutions with a suitable maters environment in order to achieve their tasks in a perfect way, also to help instructors and students to realize the educational objectives of the institution. In this paper the aspects and the importance of exchanging information between all the parties involved in the institution through reaching a high speed in performing tasks is addressed. In order to execute this work efficiently, a secure transformation and granting the right to access in a secure manner with respect to priorities were the first task to look at.

This paper deals with the routing optimization in IPV6 networks. It's the key processes of traffic engineering and network planning. Routing optimization provides a means to balance the traffic load in the network with the goal to improve the quality of service. The main objective of our routing optimization procedures is the minimization of the end-to-end delay, which is the total time of an individual packet to transfer from source to destination node. By optimized one of router's functions, this function is the packet classification. This work is done modify the packet classification operation in the router architecture by making it based on two tuples (source address and flow label) instead of the regular five tuples to classify the coming packets. Finally, to test and compare the performance of our algorithm, we used the network simulator NS-2,version 2.29. The simulation results indicate that the proposed algorithm indeed helps to minimize the end-to-end delay as a result of router optimization.

Network multimedia applications constitute a large part of Internet traffic and present a big challenge because of their sensitivity to delay, packet loss and higher bandwidth requirement. The need for guaranteed delivery and lower delay is caused by propagation of more the one domain. The domains used in this paper are co-operating and communicating with each other and all of them support IPv6 QoS. Therefore, there is a need for IP QoS management model that handles and manages QoS requests and cooperate with other QoS schemes. In this paper, the IPv6 QoS manager is tested when the QoS of traffic flows propagate two and three domains. The IPv6 QoS manager handles QoS requests by either processing them locally if the intended destination is located locally or forwarding them to the neighboring domains that are managed by IPv6 QoS managers. Two simulation scenarios are presented in this paper, intra domain, one domain, and inter domains, two and three domains. End-to-end delay results for the different scenarios have approved that this QoS model can work either in intra or inter domains. In addition to the delay, packets are policed and degraded to lower priority if they exceed their initial traffic rates. This proves that the IPv6 QoS model is flexible and not restricted to one domain. Also, end-to-end QoS has been achieved with one admission and management unit instead of individual and independent management and admission units as in the case of IntServ.

“A Comparative Study of

Architecture Description language (ADLs)&;,

Using Verilog Hardware Description Language to teach Computer Architecture Courses

As software systems grow, their complexity augments dramatically. In consequence their understandability and evolvability are becoming a difficult task, therefore a way to describe the architecture of software systems is becoming a must. The architecture of a software system can be described using either an architecture description language (ADL) or an object-oriented modeling language. In this article, we show how we can build a hybrid model, based on the two approaches, to describe the architecture of software systems. This approach profits from the advantages of the two approaches, i.e. the explicit presentation of functional aspects in object-oriented modeling and the explicit separation of competition (components) from interactions (connectors) in architectural description.

Significant challenges has been introduced for IP networks with the advent of new emerging applications, such as VOIP and E-Commerce, that require delivering quality guarantees. However, IP networks were originally designed to support best effort delivery only. Two Quality of Service (QoS) standard models, IntServ, DiffServ have been standardized by the Internet Engineering Task Force (IETF). Although these methods guarantee delivery, they have drawbacks such as complexity, restrictions of predefined classes and higher end-to-end delay. In this paper, a new QoS mathematical model has been proposed. This model is based on the principles of Network Calculus in which an incoming traffic flow is regulated by an arrival curve that upper bounds its rate. Then, this traffic flow is lower bounded and delayed by a service latency time at each node on its way to the destination node. The worst case end-to-end delay is derived and illustrated by a numerical example. The proposed model has achieved acceptable end-to-end delay compared with the other models.

Configurable Computer Design for Guidance and Control Algorithms

In this paper mappings of several different algorithms from the fields of operating systems and multimedia are discussed, together with the underlying system architecture. The system architecture is based on a board with four FPGA circuits. For the purpose of this research, a simulator of the system has been developed, and different interconnection networks, memory, and bus architectures have been tested. The results of the simulation, as well as analytical results, are presented.