particulate and gaseous emissions of pollutants from industries and auto-exhausts are responsible for rising discomfort, aggravates respiratory and cardiovascular. in this study, a system for air quality information in tehran city has been developed, using an online web-based geographic information system. this web-based gis application allows users to recognize areas with a potential increase ...

Access latency and load balancing are the two main issues in the design of clustered Web server architecture for achieving high performance. In this paper, we propose a new document distribution algorithm for load balancing on a cluster of distributed Web servers. We group Web pages that are likely to be accessed during a request session into a migrating unit, which is used as the basic unit of...

Flash crowds or application layer DDoS attacks can severely degrade the availability of websites. Peer-to-peer (P2P) networks have been exploited to amplify DDoS attacks, but we believe their available resource, such as distributed storage and network bandwidth, can be used to mitigate both flash crowds and DDoS attacks. In this poster, we propose a server initiated approach to employing the P2...

Cloud computing is a promising profitable infrastructure framework that assures to eradicate the requirement for sustaining expensive computing facilities by companies and institutes alike. Information systems supported on the cloud computing and peer-to-peer (P2P) model are now receiving popularity. In the cloud computing form, a cloud of servers sustain few clients with different types of ser...

This paper considers policies for distributing requests in clustered Web servers, wherein multiple server machines are configured to function as a single high(er) performance Web server. We evaluate various load distribution policies with respect to both their ability to achieve good load balance (the primary goal) and also to their impact on the effectiveness of per-machine caching. Trace-driv...