Walter T. Penzhorn

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Existing communication utilities, such as the ISO/OSI model and the associated automation pyramid, have limitations regarding the increased complexity of modern automation systems. The introduction of profiles for fieldbus systems, or field-area networks (FANs), was an important innovation. However, in the foreseeable future the number of FAN nodes in(More)
In this paper we propose architecture and design methodology for the inter-domains security management (IDSM) model for the IP multimedia system (IMS), which is standardized by third generation partnership project (3GPP) and 3GPP2 as next generation mobile networks. The IDSM model is based on trust domain relationship between different network domain(More)
This paper considers optimization of resource dimensioning in data communication networks, with the aim to provide Quality of Service (QoS) while maximizing resource utilization. The concept of QoS is briefly reviewed. The Differentiated Services (DiffServ) environment is introduced. By means of simulations optimal Provisioning Factors were derived. For(More)
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