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Articles 751 - 780 of 2013
Full-Text Articles in Physical Sciences and Mathematics
Mac Design And Analysis For Wireless Sensor Networks With Co-Operative Localisation, M. Rengasamy, E. Dutkiewicz, M. Hedley
Mac Design And Analysis For Wireless Sensor Networks With Co-Operative Localisation, M. Rengasamy, E. Dutkiewicz, M. Hedley
Faculty of Informatics - Papers (Archive)
Abstract—Co-operative localisation in wireless sensor networks (WSNs) is a method in which wireless sensor nodes interact with each other as peers to determine their physical position. In such networks it is crucial for communication between nodes to be contention free to meet the strict timing requirements. Medium Access Control (MAC) protocols provide the strongest influence over contention control in WSNs. The focus of this work is the design and analysis of a WSN MAC protocol suitable for supporting co-operative localisation. This paper presents a design overview of the MAC protocol and details its control structure. Preliminary simulation results are also …
Location-Based Drm Using Wifi Access Points, Martin Jan Surminen, Nicholas Paul Sheppard, Reihaneh Safavi-Naini
Location-Based Drm Using Wifi Access Points, Martin Jan Surminen, Nicholas Paul Sheppard, Reihaneh Safavi-Naini
Faculty of Informatics - Papers (Archive)
Location-based Digital Rights Management (DRM) refers to a system allowing the owner of an electronic file to specify not only the actions a user is allowed to perform regarding the content, but also restrict the actions to a specified geographical area. A method for retrieving location information is required. One such method is to place wireless accesspoints in areas of interest, requiring a device to be in the vicinity of the correct accesspoint(s) in order to access a file.
The Bullwhip Effect In Complex Supply Chains, I. Alony, Albert Munoz Aneiros
The Bullwhip Effect In Complex Supply Chains, I. Alony, Albert Munoz Aneiros
Faculty of Informatics - Papers (Archive)
This paper reviews the various methods of modelling the dynamics of supply chains. We then present recently documented causes of the Bullwhip effect in production supply chains, and the methodologies used to describe and measure the importance of these causes. We examine the limitations of these methodologies and suggest a combined approach discrete event-continuous simulation modelling approach to further study this phenomenon in complex production supply chains.
Diversity Performance Of Precoded Ofdm With Mmse Equalization, Xiaojing Huang
Diversity Performance Of Precoded Ofdm With Mmse Equalization, Xiaojing Huang
Faculty of Informatics - Papers (Archive)
Two sets of bit error rate (BER) lower bounds for precoded orthogonal frequency division multiplexing (OFDM) systems using minimum mean square error (MMSE) equalization over frequency-selective multipath fading channels are evaluated by Monte Carlo method in this paper. The first set represents the best performance under different data group sizes used for precoding, whereas the second set represents the best performance under different channel multipath diversity orders. These performance bounds can serve as the guidelines for system designers to decide proper data group sizes for precoded OFDM systems in order to achieve better trade-off between system performance and complexity. Numerical …
On Indoor Multi-Hopping Capacity Of Wireless Ad-Hoc Mesh Networks, Mehran Abolhasan, Jerry Chun-Ping Wang, D. R. Franklin
On Indoor Multi-Hopping Capacity Of Wireless Ad-Hoc Mesh Networks, Mehran Abolhasan, Jerry Chun-Ping Wang, D. R. Franklin
Faculty of Informatics - Papers (Archive)
The capacity and multi-hopping performance of ad hoc mesh networks in dynamic environment still remains an open research issue. Previous theoretical studies suggest that they do not scale in densely distributed networks. However, a study has shown that scalability and hence the multihopping capacity of mesh network is not only bound by the number of nodes in the network but also the number of hops [3]. In this paper we investigate the performance of multihop ad hoc mesh networks, using both simulation studies and an experimental test-bed, and monitor the performance of the network as the number of hops in …
Improving The Performance In An Optical Feedback Self-Mixing Interferometry System Using Digital Signal Pre-Processing, Yanguang Yu, Jiangtao Xi, Joe F. Chicharo
Improving The Performance In An Optical Feedback Self-Mixing Interferometry System Using Digital Signal Pre-Processing, Yanguang Yu, Jiangtao Xi, Joe F. Chicharo
Faculty of Informatics - Papers (Archive)
This paper considers the issue of noise reduction associated with Optical Feedback Self-mixing Interferometries (OFSMI). The objective is to develop an effective pre-processing filtering solution that can eliminated the inherent noise disturbances. The characteristics of OFSMI signals are described in some detail and two filter solutions are proposed. The latter includes a non-linear median filter and a Kaiser based FIR filter. The performance of the two types of filters are removing sparkle-like noise while Kaiser based FIR filters areeffective in reducing the high frequency noise as well as the slow time-varying signal envelop fluctuation. Interestingly our results show that the …
Pre-Processing Of Signals Observed From Laser Diode Self-Mixing Intereferometries Using Neural Networks, L. Wei, Joe F. Chicharo, Yanguang Yu, Jiangtao Xi
Pre-Processing Of Signals Observed From Laser Diode Self-Mixing Intereferometries Using Neural Networks, L. Wei, Joe F. Chicharo, Yanguang Yu, Jiangtao Xi
Faculty of Informatics - Papers (Archive)
This paper presents a novel neural network signal interpolation technique in order to eliminate the noise and disturbance associated with the self-mixing signal observed from optical feedback self- mixing interferometry (OFSMI). The proposed technique aims to improve the accuracy for displacement and moving track measurement of a target. The performance of the proposed approach is evaluated by both simulation and experimentation, with simulation revealing a measuring accuracy of A/25 for weak feedback and J20 for moderate feed back.
An Investigation Into Temporal Gamma Luminance For Digital Fringe Fourier Transform Profilometers, J. M. Baker, Joe F. Chicharo, Jiangtao Xi
An Investigation Into Temporal Gamma Luminance For Digital Fringe Fourier Transform Profilometers, J. M. Baker, Joe F. Chicharo, Jiangtao Xi
Faculty of Informatics - Papers (Archive)
Analysis of the impact of temporal gamma luminance on Fourier Transform Profilometry (FTP) Digital Video Projection (DVP) based structured light profilometers is undertaken. We investigate the spectral harmonic structure for typical DVP fringe d0 images linking projector -y and 2nd order fringe harmonics. The Ep validity of the presented study is verified through simulation, and subsequently we conclude that for typical projector -y, the 2nd order harmonic is the single most significant contribution to reconstruction error for the phase measuring technique. The impact of our analysis is further gauged by empirical measurement of the temporal variation of -y of a …
Classification Of The Deletion Correcting Capabilities Of Reed–Solomon Codes Of Dimension Over Prime Fields, L. Mcaven, R. Safavi-Naini
Classification Of The Deletion Correcting Capabilities Of Reed–Solomon Codes Of Dimension Over Prime Fields, L. Mcaven, R. Safavi-Naini
Faculty of Informatics - Papers (Archive)
Deletion correction codes have been used for transmission synchronization and, more recently, tracing pirated media. A generalized Reed-Solomon (GRS) code, denoted by GRSk(l,q,alpha,v), is a code of length l over GF(q) with qk codewords. These codes have an efficient decoding algorithm and have been widely used for error correction and detection. It was recently demonstrated that GRS codes are also capable of correcting deletions. We consider a subclass of GRS codes with dimension k=2 and q prime, and study them with respect to deletion correcting capability. We give transformations that either preserve the code or maintain its deletion correction capability. …
Location-Based Services In Emergency Management- From Government To Citizens: Global Case Studies, A. Aloudat, Katina Michael, Jun Yan
Location-Based Services In Emergency Management- From Government To Citizens: Global Case Studies, A. Aloudat, Katina Michael, Jun Yan
Faculty of Informatics - Papers (Archive)
In emergencies governments have long utilised broadcasting media like radio and television to disseminate up-to-date real-time information to citizens. In the same context, however, some other technologies like mobile location-based services have not been utilised to full extent or potential. The value of such services could be foreseen in the case of critical situations where the coordination of emergency management procedures with location-awareness activities is paramount. This paper tracks the introduction of location-aware services in the realm of emergency management. It investigates case studies where text messaging has been exploited to deliver safety information and early warnings to users based …
A Nonlinear Feature Extractor For Texture Segmentation, Fok Hing Chi Tivive, Abdesselam Bouzerdoum
A Nonlinear Feature Extractor For Texture Segmentation, Fok Hing Chi Tivive, Abdesselam Bouzerdoum
Faculty of Informatics - Papers (Archive)
This article presents a feed-forward network architecture that can be used as a nonlinear feature extractor for texture segmentation. It comprises two layers of feature extraction units; each layer is arranged into several planes, called feature maps. The features extracted from the second layer are used as the final texture features. The feature maps are characterised by a set of masks (or weights), which are shared among all the units of a single feature map. Combining the nonlinear feature extractor with a classifier, we have developed a texture segmentation system that does not rely on pre-defined filters for feature extraction; …
Barriers To Rfid Adoption In The Supply Chain, Nick Huber, Katina Michael, Luke Mccathie
Barriers To Rfid Adoption In The Supply Chain, Nick Huber, Katina Michael, Luke Mccathie
Faculty of Informatics - Papers (Archive)
This paper explores the current barriers to adoption of radio-frequency identification (RFID) for supply chain applications, and documents the perceptions of key players in the Australian RFID market. The paper contains data collected from interviews of both technology providers (e.g. RFID vendors), and prospective business customer (i.e. a large retailer). Data collected is analyzed using qualitative content analysis, and supported with figures and tables. The findings show that the three main barriers to RFID adoption are: the cost of RFID implementation (especially ongoing tag costs), lack of customer awareness and education, and a technology which is only at the beginning …
Vendor Perceptions Of How Rfid Can Minimize Product Shrinkage In The Retail Supply Chain, N. Huber, Katina Michael
Vendor Perceptions Of How Rfid Can Minimize Product Shrinkage In The Retail Supply Chain, N. Huber, Katina Michael
Faculty of Informatics - Papers (Archive)
The objective of this paper is to investigate product shrinkage in the retail supply chain, and to consider how radio frequency identification (RFID) could act as a partial solution toward a retailer’s loss prevention strategy. The research uses semi-structured interviews to collect data, and a qualitative content analysis to present the results. Given that the number of RFID deployments in the retail supply chain is limited, RFID vendors, resellers, and associations are instead used to gather the current value propositions. Representatives from nine Australian RFID vendors and associations were interviewed in August and September of 2006. The results indicate that …
Citation Analysis Using Formal Concept Analysis: A Case Study In Software Engineering, T. Tilley, P Eklund
Citation Analysis Using Formal Concept Analysis: A Case Study In Software Engineering, T. Tilley, P Eklund
Faculty of Informatics - Papers (Archive)
In this paper Formal Concept Analysis (FCA) is used as a means to analyse a field of research using published academic papers as its input. In particular, results are presented based on a case study of 47 academic papers in a scientific field of study. The analysis includes inferences about the field of study based on the domain background knowledge derived from the ISO12207 software engineering standard. Additionally, a number of alternative classifications based on the target application language and the reported application size are introduced. FCA reveals useful insights about the nature of the subject matter: identifying fruitful areas …
Why Build A Customer Relationship Management Capability?, T. R. Coltman
Why Build A Customer Relationship Management Capability?, T. R. Coltman
Faculty of Informatics - Papers (Archive)
The market enthusiasm generated around investment in CRM technology is in stark contrast to the naysaying by many academic and business commentators. This raises an important research question concerning the extent to which companies should continue to invest in building a CRM capability. Drawing on field interviews and a survey of senior executives, the results reveal that a superior CRM capability can create positional advantage and subsequent improved performance. Further, it is shown that to be most successful, CRM programs should focus on latent or unarticulated customer needs that underpin a proactive market orientation.
On The Pivot Structure For The Weighing Matrix W(12,11), C. Kravvaritis, M. Mitrouli, Jennifer Seberry
On The Pivot Structure For The Weighing Matrix W(12,11), C. Kravvaritis, M. Mitrouli, Jennifer Seberry
Faculty of Informatics - Papers (Archive)
C. Koukouvinos, M. Mitrouli and Jennifer Seberry, in "Growth in Gaussian elimination for weighing matrices, W(n, n — 1)", Linear Algebra and its Appl., 306 (2000), 189-202, conjectured that the growth factor for Gaussian elimination of any completely pivoted weighing matrix of order n and weight n — 1 is n — 1 and that the first and last few pivots are (1, 2, 2, 3 or 4, ... , n — 1 or n — 1) for n > 14. In the present paper we concentrate our study on the growth problem for the weighing matrix W(12, 11) and we …
New Higher Order Rotation Spreading Matrix For Bsofdm, I. S. Raad, Xiaojing Huang, R. Raad
New Higher Order Rotation Spreading Matrix For Bsofdm, I. S. Raad, Xiaojing Huang, R. Raad
Faculty of Informatics - Papers (Archive)
Previously a new matrix called the Rotation spreading matrix was proposed for Block Spread OFDM which had advantages over other well known spreading matrices such as the Hadamard in frequency selective channels such the UWB channels. Then a new paper discussed a method to expand this Rotation spreading matrix into higher order allowing the system BSOFDM to achieve higher order matrices which still showed excellent orthogonal properties which can be used in these frequency selective channels. This work is continued on the Rotation spreading matrix and this paper presents another method to expand the Rotation spreading matrix based on Complete …
Complementary Channel Estimation And Synchronization For Ofdm, Darryn Lowe, Xiaojing Huang
Complementary Channel Estimation And Synchronization For Ofdm, Darryn Lowe, Xiaojing Huang
Faculty of Informatics - Papers (Archive)
In this paper, we present a new type of packet preamble for orthogonal frequency division multiplexing (OFDM) systems that is based on a complementary sequence pair. It is shown how this approach permits a receiver to dynamically choose between frequency-domain equalization (FDE) and timedomain equalization (TDE). With FDE offering a low-complexity zero-forcing (ZF) equalization and TDE facilitating easy minimum mean square error (MMSE) estimation, it is concluded that a spectrally-flattened complementary sequence pair offers an outstanding combination of flexibility and performance.
Optimal Adaptive Hyperbolic Companding For Ofdm, Darryn Lowe, Xiaojing Huang
Optimal Adaptive Hyperbolic Companding For Ofdm, Darryn Lowe, Xiaojing Huang
Faculty of Informatics - Papers (Archive)
In this paper, we derive and analyze a companding algorithm based on the hyperbolic tangent and inverse hyperbolic tangent functions for use in orthogonal frequency division multiplexing (OFDM) transceivers. Probability density functions (PDFs) that approximate the transmitted and received OFDM signals in the presence of additive white Gaussian noise (AWGN) are derived and used to analyze the degree of companding relative to the signal-to-noise ratio (SNR) and clipping level. A set of optimal companding linearity coefficients for the multiband OFDM (MB-OFDM) ultra-wideband (UWB) standard are presented.
A Study Of Different Angles For Higher Order Rotation Spreading Matrix For Bsofdm In Uwb Channels, Ibrahim S. Raad, Xiaojing Huang, R. Raad
A Study Of Different Angles For Higher Order Rotation Spreading Matrix For Bsofdm In Uwb Channels, Ibrahim S. Raad, Xiaojing Huang, R. Raad
Faculty of Informatics - Papers (Archive)
This paper presents a study into different angles for higher order Rotation spreading matrix developed for BSOFDM. It was shown previously that for block size M = 2 that the angle α = π/3 achieved the best result in terms of BER in UWB channels. It was discovered that this was no longer the case when the higher order Rotation spreading matrix was used for larger M sized blocks and that other angles produced better results which proves that the Rotation spreading matrix advantage over existing spreading matrices such as the Hadamard is its flexibility to be adapted to different …
A Service - Oriented Approach To Onshore Gas Transmission Pipeline Construction, L. Dunn, P. Gibson
A Service - Oriented Approach To Onshore Gas Transmission Pipeline Construction, L. Dunn, P. Gibson
Faculty of Informatics - Papers (Archive)
This research investigates whether a traditional manufacturing planning and control strategy would make Onshore Gas Transmission Pipeline Construction more competitive and if so, design the strategy. An in-depth case study of Gas Transmission Pipeline Construction was carried out, along with an extensive literature review. The current pipeline construction process was analyzed from a strategic management perspective. From this perspective, it was found that the traditional 'make and sell' attitude of manufacturers has now almost entirely given way to a customer oriented 'sense and respond' service philosophy. This is compounded by the needs for waste avoidance, cost efficiency and service to …
Spotmac: A Pencil-Beam Mac For Wireless Mesh Networks, K. Chin
Spotmac: A Pencil-Beam Mac For Wireless Mesh Networks, K. Chin
Faculty of Informatics - Papers (Archive)
Deafness is a key problem. It erodes the performance gains provided by directional antennas, and introduces a new hidden terminal problem. To address deafness, and hence the hidden terminal problem, we propose SpotMAC. By exploiting narrow or pencil beams, SpotMAC achieves high spatial reuse, throughput and fairness. In addition, pencil beams simplify the collision avoidance process and constrain the hidden terminal problem to a linear topology which can be solved using an inverse RTS/CTS exchange. From extensive simulation studies, we confirm nodes using SpotMAC have several orders of magnitude higher throughput than those using the IEEE 802.11 MAC with omni-directional …
On The Suitability Of Framed Slotted Aloha Based Rfid Anti-Collision Protocols For Use In Rfid-Enhanced Wsns, Dheeraj Klair, K. Chin, R. Raad
On The Suitability Of Framed Slotted Aloha Based Rfid Anti-Collision Protocols For Use In Rfid-Enhanced Wsns, Dheeraj Klair, K. Chin, R. Raad
Faculty of Informatics - Papers (Archive)
This paper studies the energy consumption of frame slotted Aloha (FSA) based anti-collision protocols. Specifically, we investigate twelve FSA variants using a detailed qualitative and quantitative methodology to evaluate efficiency with varying tag population. Our results show that the variant that adjusts its frame size in accordance with tag population and incorporates the muting and early-end feature has the lowest energy consumption, hence most suited for RFID-enhanced WSNs.
Managing Business Process Risk Using Rich Organizational Models, Moshiur Bhuiyan, M. M. Zahidul Islam, George Koliadis, Aneesh Krishna, Aditya K. Ghose
Managing Business Process Risk Using Rich Organizational Models, Moshiur Bhuiyan, M. M. Zahidul Islam, George Koliadis, Aneesh Krishna, Aditya K. Ghose
Faculty of Informatics - Papers (Archive)
Business processes represent the operational capabilities of an organization. In order to ensure process continuity, the effective management of risk becomes an area of key concern. In this paper we propose an approach for supporting risk identification with the use of higher-level organizational models. We provide some intuitive metrics for extracting measures of actor criticality, and vulnerability from organizational models. This helps direct risk management to areas of critical importance within organization models. Additionally, the information can be used to assess alternative organizational structures in domains where risk mitigation is crucial. At the process level, these measures can be used …
Integration Of Agent-Oriented Conceptual Models And Uml Activity Diagrams Using Effect Annotations, Moshiur Bhuiyan, M. M. Islam, Aneesh Krishna, Aditya K. Ghose
Integration Of Agent-Oriented Conceptual Models And Uml Activity Diagrams Using Effect Annotations, Moshiur Bhuiyan, M. M. Islam, Aneesh Krishna, Aditya K. Ghose
Faculty of Informatics - Papers (Archive)
Agent–oriented conceptual modeling notations such as i* represents an interesting approach for modeling early phase requirements which includes organizational contexts, stakeholder intentions and rationale. On the other hand, Unified Modeling Language (UML) is suitable for later phases of requirement capture which usually focus on completeness, consistency, and automated verification of functional requirements for the new system. In this paper, we propose a methodology to facilitate and support the combined use of notation for modeling requirement engineering process in a synergistic fashion. For organizational modeling/early phase requirements capturing we use the i* modeling framework that describes the organizational relationships among various …
Qos-Aware Service Selection In P2p-Based Business Process Frameworks, S. Yuan, J. Shen
Qos-Aware Service Selection In P2p-Based Business Process Frameworks, S. Yuan, J. Shen
Faculty of Informatics - Papers (Archive)
With the advances and evolution of semantic Web services, service providers need to be more competitive, efficient, flexible, and integrated in the service network at different scenarios, including static and dynamic deployments and interactions. Recently, OWL-S and QoS-aware services have been distinguished due to their significance and their impact on decentralised network. JXTA and BPEL allow peers to cooperate and automate business processes and reengineer their structure, so as to rationally select and make use of all resource in decentralised environment; in addition, they increase efficiency and reduce costs. We incorporated several typical constraints to testify the possibility of the …
Towards More Flexible Internal Workflow Change: Weakly Equivalence Concept For Inter-Organizational Workflow Design, G. Liang, Sim Kim Lau
Towards More Flexible Internal Workflow Change: Weakly Equivalence Concept For Inter-Organizational Workflow Design, G. Liang, Sim Kim Lau
Faculty of Informatics - Papers (Archive)
Business process management system such as workflow management system has attracted increasing research attentions in e-commerce, especially from an inter-organizational workflow perspective. When designing inter-organizational workflow, it is important to consider soundness of the workflow, which identifies whether a workflow terminates properly. The principle of local criteria ensuring global soundness can be applied to allow the soundness of the entire inter-organizational workflow to be achieved without knowing the detail workflow of every participating organization. However, this principle sometime can become too restrictive when we attempt to ensure the overall workflow is sound while changes are made to the workflow. It …
Flicker Propagation In Interconnected Power Systems, S. Tennakoon, S. Perera, Danny Sutanto
Flicker Propagation In Interconnected Power Systems, S. Tennakoon, S. Perera, Danny Sutanto
Faculty of Informatics - Papers (Archive)
Voltage fluctuations leading to lamp flicker can propagate from the point of origin to various parts of the power system with some attenuation depending on the system impedances and load composition. Field measurements and theoretical studies suggest that the industrial loads containing large proportions of induction motors assist in attenuating flicker compared to residential loads consisting ofpassive devices. This paper describes a frequency domain approach which can be used to determine the propagation ofvoltagefluctuations when there are induction motor loads in the vicinity of the disturbing load. The method involves linearization of the network in d-q domain to evaluate various …
Analysis Of Network Asymmetry Of Interconnected 66kv Sub-Transmission Systems In Relation To Voltage Unbalance, Prabodha Paranavithana, S. Perera, Danny Sutanto
Analysis Of Network Asymmetry Of Interconnected 66kv Sub-Transmission Systems In Relation To Voltage Unbalance, Prabodha Paranavithana, S. Perera, Danny Sutanto
Faculty of Informatics - Papers (Archive)
The levels of voltage unbalance that exist in some interconnected sub-transmission networks in Australia has been observed to be above the code requirements (e.g. 1% in Victoria). There is a perception that these high levels arise as a result of asymmetrical loads. However, it is identified that the network asymmetry in relation to transmission lines also play a significant role in the lead up to this situation, employing an interconnected 66kV sub-transmission system as the study case. The individual transmission lines of the study network are analysed in order to observe their possible influence arising as a result of line …
2d Barcodes As Watermarks In Image Authentication, Prashan Premaratne, Farzad Safaei
2d Barcodes As Watermarks In Image Authentication, Prashan Premaratne, Farzad Safaei
Faculty of Informatics - Papers (Archive)
2D barcodes are increasingly used as tags in every type of goods for unique identification. Compared with the 1D barcodes, 2D barcodes not only can carry more data but also can withstand errors in subsequent scans. This property has significant parallels to watermarking logos as such watermarks will withstand multiple manipulations that are common with image transactions. We use a 2D Barcode as the watermark as this has error correction capabilities and show that this can be used to insert data imperceptibly into the host image. One Barcode is inserted into the low frequency component of the image and a …