Flavius Copaciu

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The paper presents the experimental evaluation of the existing TCP implementations: Tahoe without Fast Retransmit, Reno, New-Reno. The short time analysis involved a software tool called TBIT (TCP Behavior Inference Tool), which was designed by AT&T Center for Internet Research. It generates short TCP traffic (about 25 segments), with the 13th and the 16th(More)
Service-oriented systems are complex systems, often extending and integrating existing enterprise systems. The fast development pace that SOA enables and the inherent complexity of such systems makes it difficult to maintain an up-to-date overview of the different system components, often plagued by unexpected and difficult to predict and locate performance(More)
This paper introduces a framework for the new modeling and evaluation methodology FMC-QE (Fundamental Modeling Concepts for Quantitative Evaluation). Through hierarchical modeling of service request, three dimensional representation space and separation of operational and control states, FMC-QE enables modeling and evaluation of complex systems. This paper(More)
The Technical University of Cluj-Napoca funded a project based on PSTN/ ISDN/ VoIP to realize a digital telephone exchange network of seven Alcatel OmniPCX 4400. The paper presents the architecture, the digital/ISDN services and the VoIP integration. There were two approaches for a centralized management: CMIP-based, provided by Alcatel OmniVista 4760, and(More)
The prediction of the performance at early stages of the development of large software systems has turned out to be a very challenging task. There are already several techniques and methodologies available, each having its own advantages and limitations. This paper discusses using different techniques, one analytical and one simulative, for performance(More)
Transmission Control Protocol (TCP) is connection oriented transport protocol used on IP in wireless medium and it insists lossless data transmission in proper order. When TCP is used as a transmission protocol where physical layer is wireless medium, results high packet reordering due to bursty traffic and drastic variation in quality of service with(More)
Bibliografische Information der Deutschen Bibliothek Die Deutsche Bibliothek verzeichnet diese Publikation in der Deutschen Nationalbibliografie; detaillierte bibliografische Daten sind im Internet über Dieses Manuskript ist urheberrechtlich geschützt. Es darf ohne vorherige Genehmigung der Herausgeber nicht vervielfältigt werden. Forced by Google Earth the(More)
– SCTP is a new Transport Layer protocol recently standardized by IETF and a possible replacement of TCP. In this paper, we describe SCTP and one of its implementation. Then we evaluate the performances of the protocol in an emulated network test-bed. The scenarios included bandwidth limitation, variation of the user message size, activation and(More)
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