This paper describes new optical switching architectures supporting asynchronous variable-length packets. Output line contention is resolved by optical delay line buffers. By introducing a WDM technology, parallel buffer can be equipped with multiple wavelengths on the optical delay line buffer. Using an ul-trafast photonic label processing technique, an implementation of our architecture would...

A compound exponential-server timing channel consists of a number of infinite-buffer single-server queues in tandem. The message is coded in the sequence of arrival times to the first queue. We consider the performance of a structurally simple mismatch decoder that is the maximumlikelihood decoder for a single queue.

We are interested in studying the performance of software system in early stages of development. We investigate how queueing networks with finite capacity and blocking can be applied as performance models of software architectures. The starting point of our analysis is a software system high-level description whose dynamic behavior results in a finite state model or, as recently proposed, is de...

High bandwidth requirements in multimedia transmission make the efficient use of limited network resource a challenging task, especially when multiple clients make their requests to the server simultaneously. In this paper, we propose a self-adjusted network transmission mechanism for multiple clients. Instead of assigning a fixed bandwidth for each client, the server determines the transmissio...

TCP (Transmission Control Protocol) with its well-established congestion control mechanism is the prevailing transport layer protocol for non-real time data in current IP (Internet Protocol) networks. It would be desirable to transmit any type of multimedia data using TCP in order to take advantage of the extensive operational experience behind TCP in the Internet. However, some features of TCP...

We introduce Fracture, a novel framework that transforms and modernizes the basic process abstraction. By “fracturing” an application into logical modules, Fracture enables powerful and novel run-time configurations that improve run-time testing, application availability, and general robustness, all in a generic and incremental manner. We demonstrate the utility of fracturing via in-depth case ...

This paper proposes multimedia service system using equi-loaded distributed web-caching mechanism in the wire/wireless network environment. This proposed multimedia service system is composed of integrated switching agent (ISA), several proxies and access points(APs) with buffer in wire/wireless LAN. The ISA is the core of this system and performs switching the streams transmitted from server t...

Buffer overflow attacks are the predominant threat to the secure operation of network and in particular, Internetbased applications. Stack smashing is a common mode of buffer overflow attack for hijacking system control. This paper evaluates two architecture-based techniques to defend systems against such attacks: (1) the split control and data stack, and (2) secure return address stack (SRAS)....