Arjan Durresi

Pervasive and Trustworthy Healthcare

Healthcare is an information intensive industry. Pervasive computing, as the third wave of computing technology and when applied to healthcare systems, could potentially revolutionize next generation medical applications and significantly improve the quality of healthcare services. Healthcare information is very sensitive and security, privacy, and trust have been critical issues in health care and medical information systems. Due to the specific features of pervasive computing, these issues become much more challenging in pervasive healthcare. In this paper, we summarize some typical healthcare services pervasive healthcare can provide, identify integration and security challenges facing pervasive healthcare systems and propose some solutions to (some) of these challenging problems.

Explicit Routing in Software-Defined Networking (ERSDN): Addressing Controller Scalability

Software-Defined Networking (SDN) promises a more flexible, automatable and programmable computer network. Software-Defined Networking separates the control from data plane. The control plane is placed in a centralized controller which network applications such as traffic engineering, QoS and firewalls reside. The centralize controller creates a scalability problem when large numbers of network events are processed in the control plane. Reducing the number of network events processed in the control plane and only processing required network events is critical in addressing the scalability concerns of SDN architecture. This paper addresses the scalability problem of controller by introducing Explicit Routing in SDN (ERSDN) which is a routing scheme used to reduce the number of network events processed by the control plane. This paper makes three contributions to research. First, it presents ERSDN a routing scheme used to select transit routers throughout the network at the edge routers. Second, it presents the design and implementation of ERSDN. Third, it evaluates the effect of ERSDN on SDN controller scalability in terms of the number of network events handled in the control plane. Finally, the results show that ERSDN is able to reduce the number of network events processed in the control plane by 430% when compared to traditional routing in SDN/Open flow network. ERSDN is a promising routing solution which can be used to address the controller scalability problem.

Reliable video over software-defined networking (RVSDN)

Ensuring end-to-end quality of service for video applications requires the network to choose the most feasible path in terms of bandwidth, delay and jitter. Quality of service can only be ensured if the paths are reliable - perform to specification per request. This paper makes four contributions to research. First, it presents Reliable Video over Software-Defined Networking (RVSDN) which builds upon previous work of Video over Software-Defined Networking (VSDN) to address the issue of finding the most reliable path(s) through the network for video applications. Second, it presents the design and implementation of RVSDN. Third, it presents the experience of integrating RVSDN into ns-3 which is a network simulator used by the research community to simulate and model computer networks. Finally, it presents the results of RVSDN in terms of the number of requests serviced by the network architecture. RVSDN is able to service 31 times more requests than VSDN and MPLS explicit routing when the reliability constraint is 0.995 or greater using aggregation of reliability across network paths.