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This paper is concerned with understanding the connection between the existing Internet congestion control algorithms and the optimal control theory. The available resource allocation controllers are mainly devised to derive the state of the system to a desired equilibrium point and, therefore, they are oblivious to the transient behavior of the closed-loop system. This work aims to investigate what...
Though plenty of research has been conducted to improve Internet P2P streaming quality perceived by end-users, little has been known about the upper bounds of achievable performance with available resources so that different designs could compare against. On the other hand, the current practice has shown increasing demand of server capacities in P2P-assisted streaming systems in order to maintain...
Volunteer computing (VC) projects harness the power of computers owned by volunteers across the Internet to perform hundreds of thousands of independent jobs. In VC projects, the path leading from the generation of jobs to the validation of the job results is characterized by delays hidden in the job lifespan, i.e., distribution delay, in-progress delay, and validation delay. These delays are difficult...
The problem of finding efficient workload distribution techniques is becoming increasingly important today for heterogeneous distributed systems where the availability of compute nodes may change spontaneously over time. Therefore, the resource-allocation policy must be designed to be robust with respect to absence and re-emergence of compute nodes so that the performance of the system is maximized...
This paper is concerned with a problem in information organization and retrieval within Web communities. Most work in this domain is focused on reputation-based systems which exploit the experience gathered by previous users in order to evaluate resources at the community level. The current research focuses on a slightly different approach: a personalized evaluation system whose goal is to build a...
TLS (Transport Layer Security) is one of the most popular protocols to provide a secure channel between the client and Web server; however, the high overhead of which degrades the server performance considerably. Existing load-balancing schemes for TLS Web system can improve the performance of the system, but the balance of loads is very difficult for the features of TLS, which results in degrading...
E-learning has been an important way, method, target and criterion of modern teaching. E-assessment is an important component of e-learning and e-qualification. Item Banks using Item Response Theory are the basis of e-assessment. With the application of WEB technology, how to share item bank resources becomes one of the problems to be solved imperatively in e-assessment. This paper proposes a grid-based...
A game theoretic recommendation system is presented that aims to improve security alert dissemination and evaluation. The system increases the efficiency of its users (e.g. system administrators), who operate under time and resource limitations, by improving the information flow from security experts. Combining security alerts and local information the system recommends a resource allocation strategy...
Distributed content delivering network (DCDN) will make use of the existing resources of the common Internet users in terms of storage space, bandwidth and Internet connectivity to create it. However, DCDN has some limitations that are inefficient using of storage space, reliability and having special load balancing (LB) algorithm. So, this paper proposes re-distribution based CDN (RDCDN) that overcomes...
In this paper, we describe a global scale cluster system that we designed. The global scale cluster system is a part of "Cost Effective and Large Scale Global Internet Service Solution" project named GLORY(global resource management system for future Internet services) that was started to support global Internet Data Centers (IDCs) centers using up to 1,000,000 PC's clusters. It includes...
Sometimes the backbone network of Internet experiences congestion because traffic is not distributed rationally. This fact may lead network resources utilized inefficiently. The main idea for load balancing is to alter the route for some traffic. But current approaches with this idea often get such a long route that decrease the quality of service. This paper presents a new flow routing adjustment...
Convenient, rapid, efficient and anonymous characteristic of P2P technology, enables P2P network gathering enormous users very quickly, and P2P traffic has occupied 60~80% bandwidth of Internet. Such giant traffic has formed a threat to the service quality of other Internet application and the security of Internet itself. However, most study about P2P traffic focuses on traffic monitoring and characteristic...
The current Internet is vulnerable to attacks and failures. The past events have illustrated the Internet's vulnerability to distributed denial of service (DDoS) attacks. This paper proposes a general, and not attack specific, defense strategy through pushback and resource regulation to mitigate the effect of such attacks. Routers cooperate with victim in implementing the defense strategy. Pushback...
Of all applications of peer-to-peer systems BitTorrent-like file sharing systems becomes increasingly popular, and form a large portion of traffic on Internet. In such systems, peers should share their upload bandwidth in order to increase their download rates. Consequently, tuning the upload bandwidth, a costly resource, such that provides a desirable download time is one of the main concerns of...
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