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Articles 1 - 12 of 12
Full-Text Articles in Physical Sciences and Mathematics
Pairwise: A Time Hopping Medium Access Control Protocol For Wireless Sensor Networks, Kwan-Wu Chin
Pairwise: A Time Hopping Medium Access Control Protocol For Wireless Sensor Networks, Kwan-Wu Chin
Faculty of Informatics - Papers (Archive)
The availability of low cost, multifunctional embedded devices have become ubiquitous due to their wide ranging application that includes monitoring Radio Frequency Identification (RFID) tagged objects to ambient conditions such as temperature and humidity. Also, these devices can be equipped with a camera and then deployed in hostile environments. A key characteristic of these devices is that they can communicate wirelessly and form an ad-hoc, Wireless Sensor Network (WSN). Devices in a WSN then collaboratively monitor environment factors or objects, and forward data back to one or more central nodes. A key challenge in WSN is ensuring nodes operate in …
An Efficient Task Allocation Protocol For P2p Multi-Agent Systems, Dayong Ye, Quan Bai, Minjie Zhang, Khin Than Win, Zhiqi Shen
An Efficient Task Allocation Protocol For P2p Multi-Agent Systems, Dayong Ye, Quan Bai, Minjie Zhang, Khin Than Win, Zhiqi Shen
Faculty of Informatics - Papers (Archive)
Recently, task allocation in multi-agent systems has been investigated by many researchers. Some researchers suggested to have a central controller which has a global view about the environment to allocate tasks. Although centralized control brings convenience during task allocation processes, it also has some obvious weaknesses. Firstly, a central controller plays an important role in a multi-agent system, but task allocation procedures will break down if the central controller of a system cannot work properly. Secondly, centralized multi-agent architecture is not suitable for distributed working environments. In order to overcome some limitations caused by centralized control, some researchers proposed distributed …
Controller Design For Time-Delay Systems Using Genetic Algorithms, Haiping Du, Nong Zhang
Controller Design For Time-Delay Systems Using Genetic Algorithms, Haiping Du, Nong Zhang
Faculty of Informatics - Papers (Archive)
This paper presents a new approach to design controllers for time-delay systems by using genetical gorithms (GAs) together with the solvability of linear matrix inequalities (LMIs). Both of the state- feedback controller and the static output feedback controller can be designed with this approach. It is confirmed by numerical examples that this approach achieves less conservative results than previouslyexisting methods on the given examples.
Design And Estimation For Split Questionnaire Surveys, James O. Chipperfield, David G. Steel
Design And Estimation For Split Questionnaire Surveys, James O. Chipperfield, David G. Steel
Faculty of Informatics - Papers (Archive)
When sampling from a finite population to estimate the means or totals of K population characteristics of interest, survey designs typically impose the constraint that information on all K characteristics (or data items) is collected from all units in the sample. Relaxing this constraint means that information on a subset of the K data items may be collected from any given unit in the sample. Such a design, called a split questionnaire design (SQD), has three advantages over the typical design: increased efficiency with which design objectives can be met, by allowing the number of sample units from which information …
Dynamic Service Selection For Service Composition With Time Constraints, Azlan Ismail, Jun Yan, Jun Shen
Dynamic Service Selection For Service Composition With Time Constraints, Azlan Ismail, Jun Yan, Jun Shen
Faculty of Informatics - Papers (Archive)
Service selection is a kind of planning approach that evaluates and selects from multiple services to form a composite plan. In service selection, we found one additional issue that has not been investigated yet namely time constraints consistency among composite services. This issue is significant because there are potential time constraints involved that might cause inconsistency between selected services although they can offer aggregated QoS that satisfy global requirements. Furthermore, there might be some unintended waiting time to be considered in the QoS aggregation. Thus, this paper contributes to the analysis on the problem caused by the time constraints and …
Analysis Of Property-Preservation Capabilities Of The Rox And Esh Hash Domain Extenders, Reza Reyhanitabar, Willy Susilo, Yi Mu
Analysis Of Property-Preservation Capabilities Of The Rox And Esh Hash Domain Extenders, Reza Reyhanitabar, Willy Susilo, Yi Mu
Faculty of Informatics - Papers (Archive)
Two of the most recent and powerful multi-property preserving (MPP) hash domain extension transforms are the Ramdom-Oracle-XOR (ROX) transform and the Enveloped Shoup (ESh) transform. The former was proposed by Andreeva et al. at ASIACRYPT 2007 and the latter was proposed by Bellare and Ristenpart at ICALP 2007. In the existing literature, ten notions of security for hash functions have been considered in analysis of MPP capabilities of domain extension transforms, namely CR, Sec, aSec, eSec (TCR), Pre, aPre, ePre, MAC, PRF, PRO. Andreeva et al. showed that ROX is able to preserve seven properties; namely collision resistance (CR), three …
Identifying Anatomical Shape Difference By Regularized Discriminative Direction, Luping Zhou, Richard Hartley, Lei Wang, Paulette Lieby, Nick Barnes
Identifying Anatomical Shape Difference By Regularized Discriminative Direction, Luping Zhou, Richard Hartley, Lei Wang, Paulette Lieby, Nick Barnes
Faculty of Informatics - Papers (Archive)
Identifying the shape difference between two groups of anatomical objects is important for medical image analysis and computer-aided diagnosis. A method called ldquodiscriminative directionrdquo in the literature has been proposed to solve this problem. In that method, the shape difference between groups is identified by deforming a shape along the discriminative direction. This paper conducts a thorough study about inferring this discriminative direction in an efficient and accurate way. First, finding the discriminative direction is reformulated as a preimage problem in kernel-based learning. This provides a complementary but conceptually simpler solution than the previous method. More importantly, we find that …
A Part-Based Template Matching Method For Multi-View Human Detection, Duc Thanh Nguyen, Wanqing Li, Philip Ogunbona
A Part-Based Template Matching Method For Multi-View Human Detection, Duc Thanh Nguyen, Wanqing Li, Philip Ogunbona
Faculty of Informatics - Papers (Archive)
This paper proposes a part-based template matching method for multi-view human detection. The proposed method includes two stages: matching and verification. In particular, the best individual matching parts given a detection window are determined using an improved template matching algorithm. The hypothesis of the matched parts forming a human is then verified by employing a Bayesian-based model. The verification is not only based on the matching costs of individual parts but also how well the combining the matched parts satisfying the configuration constraints of the human body. Experimental results have shown that the proposed method is robust for detecting humans …
Face Recognition Using A Time-Of-Flight Camera, Simon Meers, Koren Ward
Face Recognition Using A Time-Of-Flight Camera, Simon Meers, Koren Ward
Faculty of Informatics - Papers (Archive)
This paper presents a novel three-dimensional (3D) method for detecting, tracking and recognising human faces using a time-of-flight camera. The system works by detecting a single central feature point, typically the nose tip, and by intersecting the 3D point data with spheres centred at the central feature point. The resulting spherical intersection profiles are used to perform face recognition and to track the position and orientation of the face. The main benefit of this method is that it is fast and efficient in terms or memory and computational expense. Furthermore, as the system utilises a time-of-flight camera and topographical information, …
Novel Constructions Of Improved Square Complex Orthogonal Designs For Eight Transmit Antennas, Le Chung Tran, Alfred Mertins, Jennifer Seberry, Tadeusz A. Wysocki, Sarah S. Adams
Novel Constructions Of Improved Square Complex Orthogonal Designs For Eight Transmit Antennas, Le Chung Tran, Alfred Mertins, Jennifer Seberry, Tadeusz A. Wysocki, Sarah S. Adams
Faculty of Informatics - Papers (Archive)
Constructions of square, maximum rate complex orthogonal space–time block codes (CO STBCs) are well known, however codes constructed via the known methods include numerous zeros, which impede their practical implementation. By modifying the Williamson and Wallis-Whiteman arrays to apply to complex matrices, we propose two methods of construction of square, order-4n CO STBCs from square, order-n codes which satisfy certain properties. Applying the proposed methods, we construct square, maximum rate, order-8 CO STBCs with no zeros, such that the transmitted symbols are equally dispersed through transmit antennas. Those codes, referred to as the improved square CO STBCs, have the advantages …
Regional Development And Local Government: Three Generations Of Federal Intervention, Andrew H. Kelly, Brian Dollery, Bligh Grant
Regional Development And Local Government: Three Generations Of Federal Intervention, Andrew H. Kelly, Brian Dollery, Bligh Grant
Faculty of Science - Papers (Archive)
Contemporary Australian local government faces several daunting problems, not least escalating financial un-sustainability and local infrastructure depletion. The main response of the various state and territory governments has taken the form of a series structural reform programs, with a strong emphasis on forced amalgamation. However, widespread dissatisfaction with the consequences of these compulsory consolidation programs has led to a search for alternative policy solutions based largely on shared services and various types of regional co-operation between local councils. This paper seeks to place proposed ‘regional’ solutions to contemporary problems in historical perspective by providing a comparative account of three distinct …
Planning At The Urban Periphery In Australia: Issues Relating To Private Residential Back And Front Yards, Andrew H. Kelly
Planning At The Urban Periphery In Australia: Issues Relating To Private Residential Back And Front Yards, Andrew H. Kelly
Faculty of Science - Papers (Archive)
This narrative focuses on three planning issues affecting the suburban residential periphery in Sydney, Australia: (i) amenity, (ii) biodiversity conservation and (iii) bushfire potential. All relate to private front and back yards, which provide key elements of the residential landscape. Embedded in the paper is the complexity of the planning system and the subsequent inconsistency between dealing with the three issues. Considerable attention is paid to local government and its changing legislative terrain. In particular, several local statutory planning instruments are investigated to illustrate this. The conclusion calls for further research while stressing more action is warranted within and outside …