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Projects
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Robust control for modeling and performance guarantees
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Description
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Real-time computing has been need in many mission critical systems. In recent years, performance guarantees are required in many new applications, such as online trading and e-business servers, multimedia
streaming, smart spaces, agile manufacture, and defence application. But these soft real-time applications are operated in open and unpredictable
environments. Traditional QoS guarantees mechanisms are open loop and only perform well in predictable environments where platform, workload, and resource demand are known in prior. Robust control theory controls uncertain plants with unknown disturbance signals and unknown dynamics with fixed controller and can achieve desired system performance. We have been applying the theory to develop a robust performance controller in distributed real-time and embedded systems and achieve QoS portability.
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Isolation support for distributed applications running on Service
Isolation support for distributed applications running on Service Oriented Architecture
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Staff
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External Research Member
Ms Julian Jang |
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Description
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Service Oriented approaches are being promoted for use designing the next generation of Internet-scale distributed applications.
A major issue rises with concurrency control where multiple distributed applications try to access the same resource. Providing isolation support would not be as trivial as distributed applications runs on SOA principles as applications have distinct characteristics, such as long running activities; maintaining stateful interactions between services; and explicit trust boundary.
A single isolation mechanism may not be applicable to all applications whose requirements are unique from one another. The aim of this research is to identify isolation patterns and corresponding isolation mechanisms that can support different application requirements.
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Challenges to Data Transport in Supporting Heterogeneous Web Services Protocol Stacks
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Staff
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External Research Member
Mr Alex Ng |
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Description
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Alex's research is in the investigation of the challenges of the data transport layer protocol in supporting a heterogeneous Web Services protocol stack. His research shows that Web Services performances are affected by a number of factors which are: (1) Network bandwidth, (2) Transport protocol processing delay, (3) XML parsing overhead, (4) Binary-to-Text serialisation overhead, and (5) Text-to-Binary de-serialisation overhead. He has proposed the Table Driven XML (TDXML) as one of the solutions to address the XML inefficiency factor and is working on experimenting and validating his new idea.
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Consistency with Weak Mechanisms
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Staff
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External Research Member
A/Prof Alan Fekete |
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Description
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This deals with the reality that many software projects (especially at enterprise scale) are unable, for reasons of performance or organisational autonomy, to use the traditional "ACID transaction" mechanisms which ensure consistency of data; however, consistency is still an essential requirement. Our goal is to provide patterns or tools so software designers and architects can routinely produce systems that correctly use the weaker, non-ACID mechanisms that are available.
I focus on two particular types of software. One is enterprise-scale systems constructed using Service Oriented Architectures, where a business process involves collaborative activities in several autonomous administrative domains. This work is in collaboration with CSIRO Distributed Systems Research Group. The other focus is on applications within the scope of a single database management system.
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Information and Networked Systems Security Research
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Consistency for Loosely Coupled Distributed Systems
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Staff
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External Research Members
A/Prof Alan Fekete (Co-Director and Academic Group Member), Dr Dean Kuo (CSIRO research staff), Ms Julian Jang (Graduated, PhD) |
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Fault-tolerant CORBA-based distributed systems
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Staff
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Internal Research Member
A/Prof David Levy |
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Architecture and Performance of Real-Time Frameworks and Middleware
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Staff
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Internal Research Member
A/Prof David Levy
External Research Member
Dr Anna Liu |
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