We study how to keep the Internet search engines up-todate with the changes occurring at the various web servers in the Internet. Currently, web search engines poll the web servers on a per-URL basis for obtaining update information. We advocate an approach in which web servers themselves track the changes happening to their content files for propagating updates to search engines. We propose an...

Due to the complex infrastructure of web applications (using application servers, web servers, database servers, etc.) response times perceived by clients can be significantly larger than they would like. The same can be applied to web services that have been implemented using the same web technology. On the other side, repeated invocations to the same ”readonly” web service with the same reque...

The Internet has recently been evolving from homogeneous congestion control to heterogeneous congestion control. Several years ago, Internet traffic was mainly controlled by the traditional AIMD algorithm, whereas Internet traffic is now controlled by many different TCP algorithms, such as AIMD, BIC, CUBIC, and CTCP. However, there is very little work on the performance and stability study of t...

Background: Neisseria meningitidis, a life-threatening human pathogen with the potential to cause large epidemics, can be isolated from the nasopharynx of 5–15% of adults. The aim of the current study was to evaluate biophysical and biochemical properties and immunological aspects of chimeric acyl-carrier protein-macrophage infectivity potentiator protein-type IV pilus biogenesis protein ...

Distributed web services are under constant threat of being attacked from nodes, internal or external to the system. Internal attacks may result from hijacking of trusted web servers, resulting in loss/corruption of information, and Denial of Service (DoS) to clients. External attacks can occur from hijacking of trusted clients or malicious nodes leading to DoS to clients. The paper focuses on ...

Today, more than 70% of all Internet sites are using Apache web servers. Furthermore, some indications are given that 40% of all web delays are due to badly tuned web servers. Consequently, we consider the tuning of web-servers to be a very relevant, practical problem. In this paper we outline an experimental set-up (graduate thesis) aiming at self-tuning of Apache web servers. First, we descri...

Since there is no concept of a session in HTTP, Web servers and browsers use cookies to capture information for subsequent communications on the Web, thus providing continuity and state across HTTP connections. Technically, cookies can be used to support electronic transactions on the Web, holding users' credit card information. However, it is insecure to store and transmit sensitive informatio...

We present web servers for analysis of non-coding RNA sequences on the basis of their secondary structures. Software tools for structural multiple sequence alignments, structural pairwise sequence alignments and structural motif findings are available from the integrated web server and the individual stand-alone web servers. The servers are located at http://software.ncrna.org, along with the i...

Web crawlers generate signi cant loads on Web servers, and are diÆcult to operate. Instead of running crawlers at many \client" sites, we propose a central crawler and Web repository that then multicasts appropriate subsets of the central repository to clients. Loads at Web servers are reduced because a single crawler visits the servers, as opposed to all the client crawlers. In this paper we m...

There is an increasing need for new Web server architectures that are application-centric, simple, small, and pervasive in nature. In this paper, we present a novel architecture for a bare PC Web server that meets most of these requirements. A bare PC Web server runs on any Intel 386 (or above) based architecture with no operating system in the machine. The application object or program contain...