barter is a scalable, highly-available and efficient electronic commerce system that facilitates digital content trade over an open network. barter is designed to operate over a large-scale, global and heterogeneous communication network infrastructure. The barter protocols address two vital requirements from an electronic commerce system, neglected from existing systems: scalability and transa...

This paper presents a qualitative analysis of security aspect of Web-Based applications that utilize Service Oriented Architecture (SOA). The architectural solutions that address security requirements are examined and compared with other quality attributes relevant to web-based systems. More specifically, a trade off analysis based on ATAM performed to show the correlation between security and ...

The increasing use of computer networks for all kinds of information exchange between autonomous computing resources is associated with a number of sideeffects. In the Internet, where computers all over the globe are interconnected, the traffic volume grows faster than the infrastructure improves, leading to congestion of networking routes. In the application domain of embedded systems, network...

In this paper we propose an on-line self-test architecture for hardware implementations of Advanced Encryption Standard (AES). The solution assumes a parallel architecture and exploits the inherent spatial replications of this implementation. Because Substitution boxes (S-Box) represent the largest hardware in this architecture, we focus on faults affecting these S-Boxes and propose a trade-off...

Many architecture features are available for improving the performance of a cache-based system. These hardware techniques include cache memories, processor stalling characteristics, memory cycle time, the external data bus width of a processor, and pipelined memory system, etc. Each of these techniques affects the cost, design, and performance of a system. We present a powerful approach to asse...

Ideally, safety should be a part of the early decision making used in conceptual system design. However, effectively evaluating safety risk 3 early enough to inform the early trade studies is not possible with current technology. This paper presents a new approach to preliminary hazard analysis that can be performed prior to system design selection and thus can influence key architectural decis...

The goal of software architecture optimization is to find architecture candidates that satisfy the expectations of all relevant stakeholders with regard to some quality attributes, e.g., performance, modifiability, or reliability. Quality attributes usually compete with each other, which makes trade-offs inevitable. In the SQuAT project the suitability of distributed search strategies for archi...

Based on the analysis of problems and difficulties in apparel quotation system, this paper puts forward the combination of BPM and SOA as a new idea for analysis of apparel quotation system, according to their advantages in business goals and requirements analysis, and the corresponding services’ definition, extraction, optimization and integration. Through the combination, system flexibility, ...

In the normal lifespan of large enterprises, the strategic management of IT often evolves. Existing services must be replaced with new services without impairing operations. The problem of scheduling such replacement is of critical importance for the success of the operation. We analyze this problem from a quantitative point of view, underlining the trade-off nature of its solutions. We formali...

Evaluating risk early in concept design in order to inform the early trade studies is difficult due to the lack of information available at that early stage. This paper describes the approach used to perform a preliminary risk evaluation to inform the trade studies MIT and the Draper Laboratory are doing as part of the Concept Evaluation and Refinement (CE&R) activities of the new NASA Space Ex...