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Articles 211 - 222 of 222
Full-Text Articles in Entire DC Network
Using Spatial Audio Cues From Speech Excitation For Meeting Speech Segmentation, Eva Cheng, I. Burnett, Christian Ritz
Using Spatial Audio Cues From Speech Excitation For Meeting Speech Segmentation, Eva Cheng, I. Burnett, Christian Ritz
Faculty of Informatics - Papers (Archive)
Multiparty meetings generally involve stationary participants. Participant location information can thus be used to segment the recorded meeting speech into each speaker's 'turn' for meeting 'browsing'. To represent speaker location information from speech, previous research showed that the most reliable time delay estimates are extracted from the Hubert envelope of the linear prediction residual signal. The authors' past work has proposed the use of spatial audio cues to represent speaker location information. This paper proposes extracting spatial audio cues from the Hubert envelope of the speech residual for indicating changing speaker location for meeting speech segmentation. Experiments conducted on recordings …
Inpcm: A Network Caching Technique For Improving The Performance Of Tcp In Wireless Ad-Hoc Networks, Andrew Adinegara, W. H. O. Lau, Kwan-Wu Chin
Inpcm: A Network Caching Technique For Improving The Performance Of Tcp In Wireless Ad-Hoc Networks, Andrew Adinegara, W. H. O. Lau, Kwan-Wu Chin
Faculty of Informatics - Papers (Archive)
We propose a novel mechanism called In-Network Packet Caching Mechanism (inPCM) to address TCP's poor performance in IEEE 802.11 based multi-hop wireless networks. In particular, we address TCP's inappropriate response to bursty and location dependent errors. The key concept is the use of intermediate nodes to perform packet recovery on behalf of TCP senders, similar to the well-known Snoop TCP but adapted to work over multi-hop wireless networks. We have conducted ns-2 simulation studies over a variety of network conditions and topologies. Our results confirm InPCM's benefits to TCP in terms of delay and throughput. Moreover, it is immediately deployable …
Hadamard Matrices Constructed By Circulant And Negacyclic Matrices, Tianbing Xia, Mingyuan Xia, Jennifer Seberry, Jing Wu
Hadamard Matrices Constructed By Circulant And Negacyclic Matrices, Tianbing Xia, Mingyuan Xia, Jennifer Seberry, Jing Wu
Faculty of Informatics - Papers (Archive)
In this paper we establish a correspondence between circulant and negacyclic matrices of order n for n odd, give the definition of suitable matrices, and show several new methods for constructing compsite suitable negacyclic (circulant) matrices from base sequences and suitable negacyclic (circulant) matrices under some general conditions.
An Energy Efficient Mac-Phy Approach To Support Distributed Source Coding In Wireless Sensor Network, Wei Wang, Dongming Peng, Honggang Wang, Hamid Sharif, Tadeusz A. Wysocki, Beata J. Wysocki
An Energy Efficient Mac-Phy Approach To Support Distributed Source Coding In Wireless Sensor Network, Wei Wang, Dongming Peng, Honggang Wang, Hamid Sharif, Tadeusz A. Wysocki, Beata J. Wysocki
Faculty of Informatics - Papers (Archive)
Distributed Source Coding (DSC) based signal processing applications are ideal candidates for multirate transmissions in Wireless Sensor Network (WSN). In this paper, we propose a novel MAC-PHY approach in WSN to achieve energy efficiency using multirate desirable for the DSC based signal processing applications. Our approach is different from the common multirate research in link adaptation, the focus of which is to increase throughput based on rate adaptation derived from variable channel conditions. In the proposed approach, the redundant and inefficient communications are eliminated, yielding significant improvement of energy efficiency in WSN. Here, the minimum desirable transmission power can be …
Correlating Business Process And Organizational Models To Manage Change, George Koliadis, Aditya K. Ghose, Moshiur Bhuiyan
Correlating Business Process And Organizational Models To Manage Change, George Koliadis, Aditya K. Ghose, Moshiur Bhuiyan
Faculty of Informatics - Papers (Archive)
Business Process Management (BPM) provides the methods, tools and modelling notations to support a processcentric organizational view and management capability. As organizations grow in size and complexity, process improvement initiatives may involve change that has direct / significant impact across an organization. Thus, we provide methods and extensions to existing process modelling notations to analyse change against high- level models of the organization. Our approach permits improved analysis against higher-level organizational structures, motivations, inter-dependencies and capabilities that should be ideally considered as primary requirements during process design. Additionally, the organizational model becomes the ‘scaffolding’ with which to construct effective process …
Fairness And Playability In Online Multiplayer Games, Jeremy Brun, Farzad Safaei, Paul Boustead
Fairness And Playability In Online Multiplayer Games, Jeremy Brun, Farzad Safaei, Paul Boustead
Faculty of Informatics - Papers (Archive)
Playability and fairness are crucial elements of an enjoyable online game experience. The unavoidable propagation time introduced by the geographical distance between participants can deteriorate the game responsiveness and playability. Also, differences in these delays can provide unfair advantages and/or disadvantages to different players. This paper explores the causal relationships between propagation time, inconsistencies, playability and fairness in online multiplayer games. It clearly defines causes of unfairness and introduces a theoretical quantification supported by an experimental technique to evaluate it in simulations. It also demonstrates through simulations the impact of changes in network architecture and topology on playability and fairness.
A New Analytical-Approximation Formula For The Optimal Exercise Boundary Of American Put Options, Song-Ping Zhu
A New Analytical-Approximation Formula For The Optimal Exercise Boundary Of American Put Options, Song-Ping Zhu
Faculty of Informatics - Papers (Archive)
In this paper, a new analytical formula as an approximation to the value of American put options and their optimal exercise boundary is presented. A transform is first introduced to better deal with the terminal condition and, most importantly, the optimal exercise price which is an unknown moving boundary and the key reason that valuing American options is much harder than valuing its European counter- parts. The pseudo-steady-state approximation is then used in the performance of the Laplace transform, to convert the systems of partial differential equations to sys- tems of ordinary differential equations in the Laplace space. A simple …
Solution Of A Certain Class Of Network Flow Problems With Cascaded Demand Aggregation And Capacity Allocation, Farzad Safaei, I. Ouveysi
Solution Of A Certain Class Of Network Flow Problems With Cascaded Demand Aggregation And Capacity Allocation, Farzad Safaei, I. Ouveysi
Faculty of Informatics - Papers (Archive)
This article develops analytical models for a class of networking problems that includes two cascaded stages of demand aggregation and capacity allocation. The solutions to these problems are required in real time as the demand fluctuates rapidly. The capacity allocation problem makes a large-scale integer programming problem too complex for practical applications. Using the Lagrangian relaxation technique and a suitably developed heuristic for multiplier adjustment, the computational complexity is reduced to such a degree that a real-time implementation of the algorithm is feasible. This article also develops efficient heuristics to aggregate demand. The proposed algorithm produces a near-optimal solution in …
A Combined Approach For Supporting The Business Process Model Lifecycle, George Koliadis, Aleksander Vranesevic, Moshiur Bhuiyan, Aneesh Krishna, Aditya K. Ghose
A Combined Approach For Supporting The Business Process Model Lifecycle, George Koliadis, Aleksander Vranesevic, Moshiur Bhuiyan, Aneesh Krishna, Aditya K. Ghose
Faculty of Informatics - Papers (Archive)
Business processes evolve throughout their lifecycle of change. Business Process Modeling (BPM2) notations such as BPMN are used to effectively conceptualize and communicate important process characteristics to relevant stakeholders. Agent-oriented conceptual modeling notations, such as i*, effectively capture and communicate organizational context. In this paper we argue that the management of change throughout the business process model lifecycle can be more effectively supported by combining notations. In particular, we identify two potential sources of process change, one occurring within the organizational context and the other within the operational context. As such the focus in this paper is on the co-evolution …
The Influence Of Site Physical Characteristics On Power Quality Performance, Glenn Nicholson, Victor J. Gosbell, Ashok Parsotam
The Influence Of Site Physical Characteristics On Power Quality Performance, Glenn Nicholson, Victor J. Gosbell, Ashok Parsotam
Faculty of Informatics - Papers (Archive)
Routine power quality (PQ) monitoring is limited to a statistical sample of sites that are hopefully representative of the overall PQ performance of the network. It would be helpful if the PQ performance of un-monitored sites could be inferred from the results of a PQ survey from a site having similar physical characteristics. This is only possible if it is known which physical characteristics are most influential in determining PQ performance. This paper describes the application of factor analysis techniques to determine the relationship between known site physical characteristics and PQ disturbance levels on the Vector Distribution Network (Auckland, New …
Challenges And Opportunities Facing Australian Universities Caused By Internationalisation Of Chinese Higher Education, Mingxuan Wu, Ping Yu
Challenges And Opportunities Facing Australian Universities Caused By Internationalisation Of Chinese Higher Education, Mingxuan Wu, Ping Yu
Faculty of Informatics - Papers (Archive)
China opened its market to the world after it entered The World Trade Organisation (WTO) at the turn of the last century. The Chinese Ministry of Education recently reviewed a series of policies about international cooperation in higher education with foreign countries in an effort to standardise their practice through centralised control. The purpose of this paper is to analyse current features and trends in international cooperation in Chinese higher education. This paper also develops a benefit-driven model of the internationalisation of Chinese higher education, and attempts to address the reasons for the marketability of cooperative programs in China. Finally, …
Modelling A Wool Scour Bowl, James Caunce, Geoff Mercer, S. I. Barry, Timothy R. Marchant
Modelling A Wool Scour Bowl, James Caunce, Geoff Mercer, S. I. Barry, Timothy R. Marchant
Faculty of Informatics - Papers (Archive)
Wool scouring is the process of washing dirty wool after shearing. Our model simulates, using the advection-diffusion equation, the movement of contaminants within a scour bowl. The effects of varying the important parameters are investigated. Interesting, but simple, relationships are found which give insight into the dynamics of a scour bowl.