The mobile cloud computing (MCC) has permit a huge facility to get information from internet, a simple user now can connect anywhere and any when for receive the desirable information. But despite that, the mobile cloud are not yet capable to resolve same problems, like the mobile energy consumption. The batteries lifetime of mobile devices presents a major concern for customers, because of the variety applications available in the cloud, customers are often connected to the internet what their cause a massive energy consumption. This consumption is made also by the presence of heavy applications hosted in the cloud that require interesting resources.
This paper proposes an implementation of a software layer that allows an intelligent scheduling of equipment in the mobile Cloud and permits also a fast processing of customer requests that will lead to a considerable conservation of energy and therefore a powerful and ecological system.

This recent years, the security of cloud computing has become a major challenge for all organizations because any attack can cause serious problems such as stealing customer and government information, control of systems by others entities (hackers) to perform any operation for their needs, etc. The last decade, the cyber-attacks have become increasingly complex, sophisticated, multiple and the majority of traditional security systems are unable to detect them.
The goal of this article is present a secure layer installed in the cloud providers that allows a high security performance in the cloud environment. This is achieved by controlling all the services executed by customers on their virtual machines and block or quarantine the unknown of them until the provider decision is made.

The printed antenna is one of the best antenna structures, due to its low cost and compact design. In this paper, we present a new approach to improve the radiation effectiveness and the performance of antennas by miniaturization of the size. Indeed, we have studied the performance of ultra wideband antenna which consists of a ring-shaped patch. This study was made for the whole frequency band of UWB ranging from 2.5GHz to 9.4GHz and the geometry of the antenna and the results were obtained using the simulation software CST Studio microwaves. The detailed design and the results are shown and discussed in this paper.

Content Management Systems (CMS) provide to its users the ability to publish on the Web with no need to have experience in developing web pages, this way CMS also participates in the expansion of reducing quality of content placed on the web similarly to Web 2.0 tools. The mechanism of validating content indicates a high level of quality content control while putting users as main players according to Web 2.0 standards, from this prospects we develop Validated Content Management System VCMS as a new Web 2.0 tool that supports content validation mechanism.
The VCMS system requires collaboration between users when content is being static validated. Real-time synchronization between users during collaboration on the same project can make this process easier and brings more rapidity to content publication while maintaining the mechanisms that allows quality control in our system.
In this article we present the technic of implementing real time interaction between users during collaboration on the same content. We focus on promoting the What You See Is What You Get (WYSIWYG) editor to support Real-time collaboration between multiple content generators. . The approach presented in this paper can be integrated to any collaborative Content Management System and also can be used in all collaborative applications that generate Web content such as blogs or wikis offering to these tools the feature of collaborating on the same content between multiple users in real-time.

In the last decade, the web has known a major evolution with the appearance of web 2.0 and its applications. One of those popular tools is the Online Video Social Networks (OVSN). Video content is becoming a predominant part of the daily life of users on the Web. Henceforth the study and modeling this kind of platforms, emerge as necessity.
In this paper, we study the interaction of user community with videos shared and viewed in online video social networks. The concept of freedom giving to users in these platforms allows them to express their opinion toward those videos. Based on the analysis of the mechanisms of interaction in OVSN, we developed a personal opinion model for online users in this case. To deal with this problem we constructed a Petri Net model and we use it to derive a payoff function, these bring us to the Game theory field.
Although our model is inspired from earlier studies, at the heart of our whole approach is abstracting the complex mechanism of interactions by the solution concept of Nash equilibrium, which allowed us to deal with richer problem instances. We conclude this paper by outlining several interesting lines of future work.

In this letter, we proposed a comparative study of a rectangular Microstrip patch antenna at Terahertz (THz) frequency ranging from 0.6 to 0.8 THz with and without superstrate. First, the simulation was carried to a simple micro-strip antenna, was then added an upper layer (superstrate) by varying the height to improve impedance matching and optimizing the performance of the antenna. The matching bandwidth and the maximum radiation gain obtained are around 22.47 % (10.43 dBi at 0.6929 THz), respectively. The performance of the dielectric resonator antenna is simulated by electromagnetic simulator CST Microwave Studio.

The main objective of this article is to adapt the Vwiki, tool proposed by our research laboratory, as a solution to the submergence of obsolete, unstructured wikis with wrong contents that are spreading through the web. Thus is for the e-leraning environment purpose. Due to the mechanism of the content validation by pairs, such as Wikipedia, and the dynamic evaluation by the community after the publication of the its content, the Vwiki is proposed as a collaborative educational tool 2.0 , which is centered on the learner and supervised by the teacher.
For realizing a collaborative course, learners will create the collaborative contents, the teacher will play the role of the content validators, while the tutor will represent the monitoring committee of the publication and will be in charge of the course process publication from the creation of the information until its final disposal or archive.
In this context, we propose a collaborative strategy 2.0 to adopt as a tool for the E-learning. Thus will provide a formal and collaborative education project at lower costs that provides collaborative courses and takes advantage of not only the collective intelligence, but also of the community and content evaluation by the learners.