acoustic experimental data of irib (islamic republic of iran broadcasting) server room was taken to measure the acoustic noise characteristics of frequency and sound pressure level (spl). the purposes of this paper are measuring the noise pollution and its evaluation through the regulations. the measurements were taken in two stages. the first one was taken at 10 points by sound investigator 22...

Background: LuxI is a component of the quorum sensing signaling pathway in Vibrio fischeri responsible for the inducer synthesis that is essential for bioluminescence. Methods: Homology modeling of LuxI was carried out using Phyre2 and refined with the GalaxyWEB server. Five models were generated and evaluated by ERRAT, ANOLEA, QMEAN6, and Procheck. Results: Five refined models were gener...

Communication through voice call leads to significant growth in technology distant areas where two or more people from opposite ends of world will connect. This research describes a case study transfer service. aims at designing system that allow Android users communicate over Wi-Fi. design is able incoming telephone caller Wi-Fi network real time UDP. It uses client/server architecture: Server...

Currently, the development of research around VoIP experience a tremendous growth. In the community of open source Asterisk represents a reliable alternative for a lower cost solution. In this same community as the SIP protocol is a supplement to the more asterisk PBX. to share the benefits claimed by proponents of free software co-existence with other Asterisk server is not yet proven. In this...

cet article est consacréà l’étude du dialogue dans enfance, récit autobiographique de nathalie sarraute qui contient des souvenirs de ses onze premières années. l’une des originalités de ce récit, se base sur la présence de deux voix narratives qui dialoguent tout au long du récit. l’une de ces dernières, joue le rôle d’une narratrice et l’autre représente le côté conscient de l’auteur qui suiv...

Modern information systems are more often web-based than simple single PC desktop applications. In the last few years, developers have used common frameworks like GWT, JSF or similar to produce thin or rich client applications with the use of Java server technology for the backend part. This paper introduces a new way of implementing thin clients with declarative web programming and PROLOG as a...

Server Farms have gained popularity for providing scalable and reliable computing / Web services. A load balancer plays a key role in this architecture, serving as a “traffic cop” to direct the requests to suitable servers. Selecting and using the proper load balancer to match the characteristics of the servers will have a significant performance impact. This paper examines some commonly used l...

In order to provide a reliable service, a video server must be able to reconstruct lost information during disk failure. We focus in this paper on reliability schemes that add redundancy within the server. We study two redundancy-based alternatives: mirroring-based schemes and parity-based schemes. We analyze in this paper these two alternatives and propose their adequate data layouts. We then ...

In this paper, the authors have focused on the stochastic analysis of an internet data center (IDC), which consists of a database main server connected to a redundant server. Observing the different possibilities of functioning of the system, analysis has been done to evaluate the various reliability characteristics of the system. The system can completely fail due to failure of redundant serve...

We apply some of the existing web server redundancy techniques for high service availability and scalability to the relatively new IP telephony context. The paper compares various failover and load sharing methods for registration and call routing servers based on the Session Initiation Protocol (SIP). In particular, we consider SIP server failover techniques based on the clients, DNS (Domain N...