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Computing HDR seminars

Aim

Since May 2011, we start to organise Computing HDR seminars. Each invited speaker is a Computing HDR student who has received a Best Student Paper Award or a Best Paper Award at a reputable conference, or has an ERA rank A/A* journal publication. This aim to organise HDR seminars is to ask some Computing HDR students to introduce their successful research experience and story to others. By this means, we expect to have more high quality research work from Computing HDR students.

Organised Seminars

Seminar on 5 May, 2011
Seminar on 19 May, 2011
Seminar on 2 June, 2011

Seminar on 5 May, 2011

Speaker: Huiyuan Zheng
Title: QoS Analysis for Web Service Composition
Venue: E6A357
Time: 3-4pm, 5 May
Abstract:
The quality of service (QoS) is a major concern in the design and management of Web service compositions. Existing QoS calculation methods cannot deal with service compositions with complex structures and are time consuming when it comes to probability distribution modeled QoS. A systematic approach is proposed to estimate QoS for Web service compositions. Four types of basic composition patterns in a service composition are discussed. A set of formulae are developed to calculate the QoS probability distributions for the basic composition patterns. In particular, QoS solutions are provided for unstructured conditional and loop patterns. By using a directed graph to model a Web service composition, patterns are able to be identified recursively by a depth-first search (DFS) method so that complex structures in service compositions can be dealt with. Experimental results show that comparing with existing approaches, the proposed QoS estimation approach greatly improves the efficiency in probabilistic QoS estimation and can be used in large scale service compositions.

Slides: here
Bio: Ms. Huiyuan Zheng is a PhD candidate in Department of Computing, Macquarie University. She received a Bachelor of Engineering degree in Communication from Beihang University (China). Her research interests are in the areas of Service Oriented Computing and performance analysis of distributed systems. Her supervisor is Prof. Jian Yang.
Award: Best Student Paper Award
Paper Info: Huiyuan Zheng, Weiliang Zhao, Jian Yang and Athman Bouguettaya, QoS Analysis for Web Service Composition. IEEE International Conference on Services Computing (SCC 2009, ERA rank A), Bangalore, India, September 23-26, 2009, 235-242, (research track, 35 papers accepted out of 189 submissions, acceptance rate=18.5%)

Seminar on 19 May, 2011

Speaker: Guanfeng Liu
Title: A Heuristic Algorithm for Trust-Oriented Service Provider Selection in Complex Social Networks
Venue: E6A357
Time: 3-4pm, 19 May
Abstract:
In a service-oriented online social network consisting of service providers and consumers, a service consumer can search trustworthy service providers via the social network. This requires the evaluation of the trustworthiness of a service provider along a certain social trust path from the service consumer to the service provider. However, there are usually many social trust paths between participants in social networks. Thus, a challenging problem is which social trust path is the optimal one that can yield the most trustworthy evaluation result. In this paper, we first present a novel complex social network structure and a new concept, Quality of Trust (QoT). We then model the optimal social trust path selection with multiple end-to-end QoT constraints as a Multi-Constrained Optimal Path (MCOP) selection problem, which is NP-Complete. For solving this challenging problem, we propose an efficient heuristic algorithm, H-OSTP. The results of our experiments conducted on a large real dataset of online social networks illustrate that our proposed algorithm significantly outperforms existing approaches.
Bio: Guanfeng Liu is a now PhD candidate in the Department of Computing, Macquarie University, who was enrolled in Feb. 2009. He received his Bachelor of Engineering degree in Computer Science and Technology from Qingdao University of Science and Technology, P. R. China in 2005, and the Master of Engineering degree in Computer Software and Theory from Qingdao University, P. R. China in 2008. His current research focuses on the trust management and evaluation in online social networks. At Macquarie, Guanfeng's supervisors are Dr. Yan Wang and Prof. Mehmet Orgun.
Award: Best Paper Award
Paper Info: Guanfeng Liu, Yan Wang, Mehmet A. Orgun and Ee-Peng Lim, A Heuristic Algorithm for Trust-Oriented Service Provider Selection in Complex Social Networks. 2010 IEEE International Conference on Services Computing (SCC 2010, ERA rank A) (research track, 29 papers accepted out of 165 submissions, acceptance rate=17.6%), pp. 130-137, Miami, Florida, USA, July 05-10, 2010

Joint Honours and HDR Seminar on 2 June, 2011

Speaker: Abeed Sarker
Title:Improved Reconstruction of Flutter Shutter Images for Motion Blur Reduction
Venue: E6A357
Time: 3-4pm, 2 June
Abstract:
Relative motion between a camera and its subject introduces motion blur in captured images. Reconstruction of unblurred images is ill-posed due to the loss of spatial high frequencies. The flutter shutter preserves high frequencies by rapidly opening and closing the shutter during exposure, providing greatly improved reconstruction. We address two open problems in the reconstruction of unblurred images from flutter shutter images. Firstly, we propose a noise reduction technique that reduces reconstruction noise while preserving image detail. Secondly, we propose a semi-automatic technique for estimating the Point Spread Function of the motion blur. Together these techniques provide substantial improvement in reconstruction of flutter shutter images.
Bio:Abeed Sarker is now a PhD candidate in the Department of Computing, Macquarie University (enrolled in April 2010). He received his Bachelor of Information Systems (HONS) degree from Macquarie University in 2009 . His Honours research focused on digital image processing under the supervision of Dr. Leonard Hamey. His current research focuses on automatic text summarization for the medical domain and his supervisors are Dr. Diego Molla-Aliod (principal supervisor) and Dr. Cecile Paris (co-supervisor).
Award: Best Paper Award
Paper Info: Abeed Sarker, Leonard G. C. Hamey, "Improved Reconstruction of Flutter Shutter Images for Motion Blur Reduction", 2010 International Conference on Digital Image Computing: Techniques and Applications (DICTA, 37 papers were selected for oral presentation from 194 submissions), 2010, pp.417-422

Who to Contact?

If you have good research work to introduce at an HDR seminar, please contact Dr. Yan Wang (yanwang@mqeduau).