High availability is becoming an essential part of network services because even a little downtime may lead to a great loss of money. According to previous research, network failure is one of the major causes of system unavailability. In this paper, we propose a framework called HANet for building highly available network services. The main goal of HANet is to allow a server to continue providi...

BACKGROUND Medical education in pathology and histology in low-resource countries face many obstacles because of equipment cost and telecommunication deficiencies. Digital Pathology may provide solutions. We report student experience to virtual slides on a local network and a remote image server. METHODS Using an iPad tablet device, fifty 3rd and 4th year medical students viewed digital patho...

This paper addresses the design problems concerning a large scale parallel video on demand server that consists of multiple clusters of nodes connected by a high performance interconnection network In order to e ciently control the ow of video streams we propose two scheduling algorithms for data retrieval and communica tion First we present a disk scheduling algorithm called round scheduling w...

TCP Server is a system architecture aiming to offload network processing from the host(s) running an Internet server. The basic idea is to execute the TCP/IP processing on a dedicated processor, node, or device (the TCP server) using low-overhead, non-intrusive communication between it and the host(s) running the server application. In this paper, we propose, implement, and evaluate three TCP S...

A novel and simple approach for defining end-to-end quality of service (QoS) in video-on-demand (VoD) services is presented. Using this approach, we derive a schedulable region for a video server which guarantees end-to-end QoS, where a specific QoS required in the video client translates into a QoS specification for the video server. Our methodology is based on a generic model for VoD services...

The paper studies closed queueing networks containing a server station and k client stations. The server station is an infinite server queueing system, and client stations are single server queueing systems with autonomous service, i.e. every client station serves customers (units) only at random instants generated by strictly stationary and ergodic sequence of random variables. The total numbe...

This work analyzes web server performance under simulated WAN conditions. The workload simulates many critical network characteristics, such as network delay, bandwidth limit for client connections, and small MTU sizes to dial-up clients. A novel aspect of this study is the examination of the internal behavior of the web server at the network protocol stack and the device driver. Many known ser...

Spam mails are unwanted mails sent to large number of users. Spam mails not only consume the network resources, but cause security threats as well. This paper proposes an efficient technique to detect, and to prevent spam mail in the sender side rather than the receiver side. This technique is based on a counter set on the sender server. When a mail is transmitted to the server, the mail server...

In [1] we reported the design and implementation of a video-on-demand (VOD) system using a server array architecture. In this paper, we extend the work into a full multimedia server array system for world-wide-web services. The system allows stream-type services such as video and audio guaranteed continuous service irrespective of the background data traffic. The server array approach has the b...

The paper studies closed queueing networks containing a server station and k client stations. The server station is an infinite server queueing system, and client stations are single server queueing systems with autonomous service, i.e. every client station serves customers (units) only at random instants generated by strictly stationary and ergodic sequence of random variables. The total numbe...