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2012

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Articles 18871 - 18900 of 23304

Full-Text Articles in Social and Behavioral Sciences

Measuring Face Familiarity And Its Application To Face Recognition, Ce Zhan, Wanqing Li, Philip O. Ogunbona Jan 2012

Measuring Face Familiarity And Its Application To Face Recognition, Ce Zhan, Wanqing Li, Philip O. Ogunbona

Faculty of Engineering and Information Sciences - Papers: Part A

The familiarity of faces is one of the key factors that come into play during human face analysis. However, there is very little research that studies face familiarity. In this paper, two methods are proposed to quantitatively measure the degree of familiarity of a face with respect to a known set. The methods are in accordance with the psychological study. In particular, non-negative matrix factorization (NMF) is extended to learn a localized non-overlapping subspace representation of commonly experienced facial patterns from known faces. The familiarity of a given face is then measured based on its reconstruction error after being projected …

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Beyond Simple Classifications: Contemporary Information Systems Development Projects As Complex Adaptive Systems, Karlheinz Kautz Jan 2012

Beyond Simple Classifications: Contemporary Information Systems Development Projects As Complex Adaptive Systems, Karlheinz Kautz

Faculty of Engineering and Information Sciences - Papers: Part A

Contemporary Information Systems Development (ISD) takes place in a dynamic environment and is generally acknowledged as a complex activity. We investigate whether complex adaptive systems (CAS) theory is relevant as a theoretical foundation for understanding ISD, and if so, what kind of conception can be achieved by utilizing the theory? We introduce key CAS concepts and describe an emergent method framework for understanding ISD. Extending existing research, our main contribution is twofold: We first show how CAS and CAS principles are advantageous for comprehending and organizing ISD in general, beyond any particular development approach chosen for the execution of a …

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An Ontology Development Methodology To Integrate Existing Ontologies In An Ontology Development Process, Nelson K. Y Leung, Sim Kim Lau, Nicole Tsang Jan 2012

An Ontology Development Methodology To Integrate Existing Ontologies In An Ontology Development Process, Nelson K. Y Leung, Sim Kim Lau, Nicole Tsang

Faculty of Engineering and Information Sciences - Papers: Part A

Ontology is defmed as an explicit specification of a conceptualization while a conceptualization is an abstract, simplified view of the world that we wish to represent for some purpose. To build high quality ontologies, developers are required to choose and follow a suitable ontology development methodology in which containing a series of steps, activities and guidelines that are put together in an organized and systematic manner. Literatures show that building ontologies by reusing existing ontologies is more cost effective than building from scratch. However, majority of the methodologies only provide a very limited discussion about how to perform integration or …

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Power-Aware Routing In Networks With Delay And Link Utilization Constraints, Gongqi Lin, Sieteng Soh, Mihai Lazarescu, Kwan-Wu Chin Jan 2012

Power-Aware Routing In Networks With Delay And Link Utilization Constraints, Gongqi Lin, Sieteng Soh, Mihai Lazarescu, Kwan-Wu Chin

Faculty of Engineering and Information Sciences - Papers: Part A

Current network infrastructures are over-provisioned and thus exhibit poor power efficiency at low traffic load. In this paper, we consider networks comprising of bundled links, whereby each link has one or more physical cables that can be switched off independently. The problem at hand is then to switch off redundant cables during off peak periods, while retaining the QoS provided to existing traffic demands. Unfortunately, the problem to maximally shutdown redundant cables is an NP-complete problem. Henceforth, we design a fast heuristic, called Multiple Paths by Shortest Path First (MSPF), that aims to maximize the number of switched-off cables subject …

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Segmentations Of Through-The-Wall Radar Images, C H. Seng, M G. Amin, F Ahmad, A Bouzerdoum Jan 2012

Segmentations Of Through-The-Wall Radar Images, C H. Seng, M G. Amin, F Ahmad, A Bouzerdoum

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper, we examine the use of image segmentation approaches for target detection in TWRI. The betweenclass variance thresholding, entropy-based segmentation, and Kmeans clustering are applied to segment target and clutter regions. Real 2D polarimetric images are used to demonstrate that simple histogram-based segmentation methods produce either comparable or improved performance over the Likelihood Ratio Tests (LRT) detector. Specifically, the results show that, for the cases considered, the entropy-based segmentation outperforms the other image segmentation methods and the LRT detector.

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Improvements In Dose Calculation Accuracy For Small Off-Axis Targets In High Dose Per Fraction Tomotherapy, Nicholas Hardcastle, Adam Bayliss, Jeannie Wong, Anatoly B. Rosenfeld, Wolfgang A. Tome Jan 2012

Improvements In Dose Calculation Accuracy For Small Off-Axis Targets In High Dose Per Fraction Tomotherapy, Nicholas Hardcastle, Adam Bayliss, Jeannie Wong, Anatoly B. Rosenfeld, Wolfgang A. Tome

Faculty of Engineering and Information Sciences - Papers: Part A

Purpose: A recent field safety notice from TomoTherapy detailed the underdosing of small, off-axis targets when receiving high doses per fraction. This is due to angular undersampling in the dose calculation gantry angles. This study evaluates a correction method to reduce the underdosing, to be implemented in the current version (v4.1) of the TomoTherapy treatment planning software. Methods: The correction method, termed "Super Sampling" involved the tripling of the number of gantry angles from which the dose is calculated during optimization and dose calculation. Radiochromic film was used to measure the dose to small targets at various off-axis distances receiving …

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The Seven-Level Flying Capacitor Based Anpc Converter For Grid Intergration Of Utility-Scale Pv Systems, Georgios Konstantinou, Sridhar R. Pulikanti, Mihai Ciobotaru, Vassilios G. Agelidis, Kashem Muttaqi Jan 2012

The Seven-Level Flying Capacitor Based Anpc Converter For Grid Intergration Of Utility-Scale Pv Systems, Georgios Konstantinou, Sridhar R. Pulikanti, Mihai Ciobotaru, Vassilios G. Agelidis, Kashem Muttaqi

Faculty of Engineering and Information Sciences - Papers: Part A

The installed capacity of grid connected PV plants has increased significantly over the past few years and is expected to continue its growth over the next decade due to the continuous demand for renewable energy and distributed generation systems. This paper presents a seven-level flying capacitor (FC) based active neutral point clamped (ANPC) converter for the connection of utility-scale PV system to the electricity grid. The multilevel voltage output of the topology provides high quality waveforms while maintaining the operational characteristics of NPC based converters for PV systems. The converter topology together with a method to regulate the FC voltages …

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Wavelet Diagnosis Of Ecg Signals With Kaiser Based Noise Diminution, Sridhathan Chandramouleeswaran, Ahmed M. Haidar, Fahmi Samsuri Jan 2012

Wavelet Diagnosis Of Ecg Signals With Kaiser Based Noise Diminution, Sridhathan Chandramouleeswaran, Ahmed M. Haidar, Fahmi Samsuri

Faculty of Engineering and Information Sciences - Papers: Part A

The evaluation of distortion diagnosis using Wavelet function for Electrocardiogram (ECG), Electroen- cephalogram (EEG) and Phonocardiography (PCG) is not novel. However, some of the technological and economic issues remain challenging. The work in this paper is focusing on the reduction of the noise inter- ferences and analyzes different kinds of ECG signals. Furthermore, a physiological monitoring system with a programming model for the filtration of ECG is presented. Kaiser based Finite Impulse Response (FIR) filter is used for noise reduction and identifica- tion of R peaks based on Peak Detection Algorithm (PDA). Two approaches are implemented for detect- ing the …

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Control Of Five-Level Flying Capacitor Based Active-Neutral-Point-Clamped Converter For Grid Connected Wind Energy Applications, Sridhar R. Pulikanti, Kashem Muttaqi, D Suntanto Jan 2012

Control Of Five-Level Flying Capacitor Based Active-Neutral-Point-Clamped Converter For Grid Connected Wind Energy Applications, Sridhar R. Pulikanti, Kashem Muttaqi, D Suntanto

Faculty of Engineering and Information Sciences - Papers: Part A

Integration of wind energy sources into the distribution grid affects the voltage profile that could be stabilized through the grid reinforcement or limiting the active power injection. This paper presents a control strategy to regulate the voltage at point of common coupling (PCC) through reactive power exchange to the grid. The reactive power capability of the grid-connected hybrid multilevel converter is based on the voltage sensitivity of the distribution grid at PCC. A hybrid five-level multilevel converter referred as flying capacitor (FC) based active-neutral-point-clamped (ANPC) converter is considered. It is an arrangement of a three-level ANPC converter and a two-level …

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Correlating Uncompensated Antiferromagnetic Moments And Exchange Coupling Interactions In Interface Ion-Beam Bombarded Co90fe 10/Cofe-Oxide Bilayers, Chin Shueh, Pei-Shi Chen, David Cortie, Frank Klose, Wen-Chen Chen, T H. Wu, Johan Van Lierop, Ko-Wei Lin Jan 2012

Correlating Uncompensated Antiferromagnetic Moments And Exchange Coupling Interactions In Interface Ion-Beam Bombarded Co90fe 10/Cofe-Oxide Bilayers, Chin Shueh, Pei-Shi Chen, David Cortie, Frank Klose, Wen-Chen Chen, T H. Wu, Johan Van Lierop, Ko-Wei Lin

Faculty of Engineering and Information Sciences - Papers: Part A

The coercivity and exchange bias field of ferro-/antiferromagnetic Co 90Fe10/CoFe-oxide bilayers were studied as function of the surface morphology of the bottom CoFe-oxide layer. The CoFe-oxide surface structure was varied systematically by low energy (0-70 V) Argon ion-beam bombardment before subsequent deposition of the Co90Fe10 layer. Transmission electron microscopy results showed that the bilayer consisted of hcp Co90Fe10 and rock-salt CoFe-oxide. At low temperatures, enhanced coercivities and exchange bias fields with increasing ion-beam bombardment energy were observed, which are attributed to defects and uncompensated moments created near the CoFe-oxide surface in increasing amounts with larger ion-beam bombardment energies. Magnetometry results …

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Dynamic Change Impact Analysis For Maintaining And Evolving Agent Systems, Hoa Khanh Dam, Aditya Ghose Jan 2012

Dynamic Change Impact Analysis For Maintaining And Evolving Agent Systems, Hoa Khanh Dam, Aditya Ghose

Faculty of Engineering and Information Sciences - Papers: Part A

In contrast to an increasing number of agent-based applica- tions in various domains, there has been very little work on maintenance and evolution of agent systems. This paper ad- dresses this gap with a focus on change impact analysis, i.e. estimating the potential eects of changes before they are made as an agent system evolves. We propose a technique for performing impact analysis in an agent system using dy- namic information about agent behaviour. Our approach builds a representation of an agent's behaviour by analyzing its execution traces which consist of goals and plans, and uses this representation to estimate …

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Thermal, Microstructural And Mechanical Coupling Analysis Model For Flatness Change Prediction During Run-Out Table Cooling In Hot Strip Rolling, Xiao-Dong Wang, Fei Li, Zheng-Yi Jiang Jan 2012

Thermal, Microstructural And Mechanical Coupling Analysis Model For Flatness Change Prediction During Run-Out Table Cooling In Hot Strip Rolling, Xiao-Dong Wang, Fei Li, Zheng-Yi Jiang

Faculty of Engineering and Information Sciences - Papers: Part A

Non-uniformity of temperature distribution across strip width direction is the ultimate reason why the flatness defect occurs on the strip after cooling process although the strip is flat at the exit of finishing mill. One thermal, microstructural and mechanical coupling analysis model for predicting flatness change of steel strip during the run-out table cooling process was established using ABAQUS finite element software. K Esaka phase transformation kinetics model was employed to calculate the phase transformation, and coupled with temperature calculation using the user subroutine program HETVAL. Elasto-plasticity constitutive equations of steel material, in which conventional elastic and plastic strains, thermal …

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Estimation In Autoregressive Population Models, Thomas Suesse Jan 2012

Estimation In Autoregressive Population Models, Thomas Suesse

Faculty of Engineering and Information Sciences - Papers: Part A

Autoregressive (AR) models for spatial and social interaction have been proposed by many authors. A sample of units is obtained and the model is applied to this sample. Estimation methods such as the maximum likelihood method (ML) have been employed and investigated in the literature. The main assumption is that a response depends on other responses, when these units interact. Some of those units will be in the sample and some in the non-sample. Therefore the model should apply to the whole population rather to the sample only. Under such a population model, the marginal model for the responses of …

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A Novel Destination-Based Routing Protocol (Dbrp) In Dtns, Saeid Iranmanesh, Raad Raad, Kwan-Wu Chin Jan 2012

A Novel Destination-Based Routing Protocol (Dbrp) In Dtns, Saeid Iranmanesh, Raad Raad, Kwan-Wu Chin

Faculty of Engineering and Information Sciences - Papers: Part A

In Delay Tolerant Networks (DTNs), the aim of any forwarding/routing protocols is to achieve a high delivery ratio of packets/bundles at the lowest possible bandwidth cost, buffer space and energy. Therefore, finding a protocol which uses less resource to achieve high delivery ratio and low latency is an open research question. This paper proposes a quota-based protocol which confines the number of replicas and forwards them based on the meeting history of nodes. The unique aspect of our protocol is to weight any encounter with the final destination to be much higher than any other node encounter. This aspect of …

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Application Of Multi-Agent System For Preventing Power Interruption In A Large Power System, S R. Islam, Darmawan Sutanto, K M. Muttaqi Jan 2012

Application Of Multi-Agent System For Preventing Power Interruption In A Large Power System, S R. Islam, Darmawan Sutanto, K M. Muttaqi

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents an emergency control approach for preventing wide spread power interruption using multi-agent system. The proposed control algorithm is based on decentralized architecture of intelligent agents to achieve fast and accurate response when a catastrophic disturbance is identified in the system. By dividing the network into several areas, the voltage instability problem can be localized and countermeasures can be directed to the most affected area by the authorized local agent. This facilitates quick decision making within the system. The effectiveness of the proposed technique has been proved by a simulation of IEEE 57 bus test power system.

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Wearable Sensors In Intelligent Clothing For Measuring Human Body Temperature Based On Optical Fiber Bragg Grating, Hongqiang Li, Haijiang Yang, Enbang Li, Zhihui Liu, Kejia Wei Jan 2012

Wearable Sensors In Intelligent Clothing For Measuring Human Body Temperature Based On Optical Fiber Bragg Grating, Hongqiang Li, Haijiang Yang, Enbang Li, Zhihui Liu, Kejia Wei

Faculty of Engineering and Information Sciences - Papers: Part A

Measuring body temperature is considerably important to physiological studies as well as clinical investigations. In recent years, numerous observations have been reported and various methods of measurement have been employed. The present paper introduces a novel wearable sensor in intelligent clothing for human body temperature measurement. The objective is the integration of optical fiber Bragg grating (FBG)-based sensors into functional textiles to extend the capabilities of wearable solutions for body temperature monitoring. In addition, the temperature sensitivity is 150 pm/°C, which is almost 15 times higher than that of a bare FBG. This study combines large and small pipes during …

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Robust Distributed Privacy-Preserving Secure Aggregation In Vehicular Communication, Bo Qin, Qianhong Wu, Josep Domingo-Ferrer, Willy Susilo Jan 2012

Robust Distributed Privacy-Preserving Secure Aggregation In Vehicular Communication, Bo Qin, Qianhong Wu, Josep Domingo-Ferrer, Willy Susilo

Faculty of Engineering and Information Sciences - Papers: Part A

Vehicular ad hoc networks (VANETs), formed by computers embedded in vehicles and the traffic infrastructure, are expected to develop in the near future to improve traffic safety and efficiency. To this end, VANETs should be designed to be resistant against various abuses and attacks. In this paper, we first review the existing proposals to provide security, privacy, and data aggregation in vehicle-to-vehicle communication. We then address the fundamental issue of achieving these conflicting properties in a unified solution, having observed that separate efforts cannot fulfill the VANET design objectives. A set of new mechanisms are suggested for efficiently managing identities …

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Self-Mixing Interferometry Used For Instrumentations And Measurements(Invited), Silvano Donati, Zhao Wang, Yanguang Yu Jan 2012

Self-Mixing Interferometry Used For Instrumentations And Measurements(Invited), Silvano Donati, Zhao Wang, Yanguang Yu

Faculty of Engineering and Information Sciences - Papers: Part A

This paper reviews the development of a new configuration of interferometry, Self-mixing Interferometry(SMI). SMI is attractive because it doesn't require any optical part external to the laser and can be employed in a variety of measurements, ranging from the traditional measurements related to optical path length like displacements, small-amplitude vibrations, velocity; to sensing of weak optical echoes, like return loss and isolation factor measurements; and also to a special feature for the interaction with the medium, measurements of physical parameters, like laser line width, coherence length, and the alfa factor. Because it is also a coherent detection scheme, the SMI …

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Wavelet Transform Based De-Noising Method For Self Mixing Interferometry Signals, Yuan Sun, Yanguang Yu, Jiangtao Xi Jan 2012

Wavelet Transform Based De-Noising Method For Self Mixing Interferometry Signals, Yuan Sun, Yanguang Yu, Jiangtao Xi

Faculty of Engineering and Information Sciences - Papers: Part A

Self-mixing interferometry (SMI) signals are observed from a laser diode (LD) with optical feedbacks induced by an external target. SMI signals carry information related to both of the target and parameters of the LDs. However, the noise contained in SMI signals greatly degrades the applications of the SMI systems. This paper proposes a wavelet transform based de-noising method which can effectively eliminate noise while keeping an SMI waveform less changed. The proposed method is verified by both simulations and experiments

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Hybrid Frp-Concrete-Steel Double-Skin Tubular Columns: Cyclic Axial Compression Tests, Tao Yu, Yu-Bo Cao, Bing Zhang, J G. Teng Jan 2012

Hybrid Frp-Concrete-Steel Double-Skin Tubular Columns: Cyclic Axial Compression Tests, Tao Yu, Yu-Bo Cao, Bing Zhang, J G. Teng

Faculty of Engineering and Information Sciences - Papers: Part A

Hybrid FRP-concrete-steel double-skin tubular columns (hybrid DSTCs) are a new form of hybrid columns recently developed at The Hong Kong Polytechnic University. A hybrid DSTC consists of an inner steel tube, an outer FRP tube and a concrete infill between the two tubes. Hybrid DSTCs possess many important advantages over existing column forms, including their excellent corrosion resistance and excellent seismic resistance. While a large amount of research has been conducted on the monotonic behavior of this novel form of columns, only a limited amount of work has been conducted on their behavior under cyclic loading. This paper presents the …

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Analysis Of Temperature Field In Liquid-Solid Bimetal Casting Of Laminated Metal Composite, Xingjian Gao, Dongbin Wei, Zhengyi Jiang Jan 2012

Analysis Of Temperature Field In Liquid-Solid Bimetal Casting Of Laminated Metal Composite, Xingjian Gao, Dongbin Wei, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part A

In order to improve the low toughness and poor crack resistance of high chromium cast iron (HCCI), the laminated metal composite (LMC) consisting of HCCI and carbon steel has received increasingly attentions in modern industries. Considering that the controllable temperature field at interface of LMC is a key issue in liquid-solid bimetal casting process, a three layered finite element method (FEM) model has been proposed. The influence of parameters including pouring temperature - Tpour, preheating temperature - Tpre and effective volume ratio - VRe on temperature field are discussed. Simulation results show that the temperature at the interface between two …

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Behaviour Of Hybrid Double-Skin Tubular Columns Subjected To Combined Axial Compression And Cyclic Lateral Loading, Bing Zhang, J G. Teng, Tao Yu Jan 2012

Behaviour Of Hybrid Double-Skin Tubular Columns Subjected To Combined Axial Compression And Cyclic Lateral Loading, Bing Zhang, J G. Teng, Tao Yu

Faculty of Engineering and Information Sciences - Papers: Part A

Hybrid FRP-concrete-steel double-skin tubular columns (hybrid DSTCs) are a new form of hybrid columns developed at The Hong Kong Polytechnic University. They consist of an outer tube made of fibre reinforced polymer (FRP) and an inner tube made of steel, with the space between filled with concrete. In these hybrid DSTCs, the three constituent materials are optimally combined to achieve several advantages not available with existing forms of columns, including their superior corrosion and seismic performance. This paper presents the test results of a series of large-scale hybrid DSTCs subjected to combined axial and cyclic lateral loads, with an emphasis …

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A Low Cost Soft Mapper For Turbo Equalization With High Order Modulation, Licai Fang, Qinghua Guo, Defeng (David) Huang, Sven Nordholm Jan 2012

A Low Cost Soft Mapper For Turbo Equalization With High Order Modulation, Licai Fang, Qinghua Guo, Defeng (David) Huang, Sven Nordholm

Faculty of Engineering and Information Sciences - Papers: Part A

In an MMSE based turbo equalization system, a soft mapper calculates the symbol mean and variance based on extrinsic Log-Likelihood-Ratios (LLRs) information coming from a Soft-Input Soft-Output (SISO) decoder. In this paper, we investigate the complexity of this module, and in particular, we employ a 3-segment linear approximation approach to calculate the mean and variance of data symbols from LLRs. For FPGA and VLSI implementation, we propose novel piecewise linear functions which map LLR to the mean and variance directly without the use of any two-variable-input multipliers. Simulation results for 16-QAM and 64-QAM show that the no multiplier approach has …

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A Sociomaterial Approach To Co-Creating Rfid Value In A Multi-Firm Supply Chain Knowledge Sharing Einvironment: A Longitudinal Case Study, Akemi T. Chatfield, Samuel F. Wamba Jan 2012

A Sociomaterial Approach To Co-Creating Rfid Value In A Multi-Firm Supply Chain Knowledge Sharing Einvironment: A Longitudinal Case Study, Akemi T. Chatfield, Samuel F. Wamba

Faculty of Engineering and Information Sciences - Papers: Part A

Orlikowski and Lacono (2001, p. 132) aptly argue that IT artifacts, particularly distributed network technology applications, including RFID, "do not provide the same material and cultural properties in each local time or context of use." A sociomaterial theory suggests the importance of adopting an integrative approach to study the social and material effects when examining IT benefits realization. While much has been written about the high potential of RFID as a new class of strategic enterprise information systems, the early adopters of RFID and researchers still have to answer the question on how to co-create the business value of RFID …

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In Silico Nanodosimetry: New Insights Into Nontargeted Biological Responses To Radiation, Zdenka Kuncic, Hilary L. Byrne, Aimee L. Mcnamara, Susanna Guatelli, Westa Domanova, Sebastian Incerti Jan 2012

In Silico Nanodosimetry: New Insights Into Nontargeted Biological Responses To Radiation, Zdenka Kuncic, Hilary L. Byrne, Aimee L. Mcnamara, Susanna Guatelli, Westa Domanova, Sebastian Incerti

Faculty of Engineering and Information Sciences - Papers: Part A

The long-held view that radiation-induced biological damage must be initiated in the cell nucleus, either on or near DNA itself, is being confronted by mounting evidence to suggest otherwise. While the efficacy of cell death may be determined by radiation damage to nuclear DNA, a plethora of less deterministic biological responses has been observed when DNA is not targeted. These so-called nontargeted responses cannot be understood in the framework of DNA-centric radiobiological models; what is needed are new physically motivated models that address the damage-sensing signalling pathways triggered by the production of reactive free radicals. To this end, we have …

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A Multi-Agent Solution To Distribution System Management By Considering Distributed Generators, Fenghui Ren, Minjie Zhang, Darmawan Sutanto Jan 2012

A Multi-Agent Solution To Distribution System Management By Considering Distributed Generators, Fenghui Ren, Minjie Zhang, Darmawan Sutanto

Faculty of Engineering and Information Sciences - Papers: Part A

A traditional distribution network carries electricity from a central power resource to consumers, and the power dispatch is controlled centrally. Distributed generators (DGs) emerge as an alternative power resource to distribution networks at a smaller and distributed scale, which will bring benefits such as reduced voltage drop and loss. However, because most of high penetration DGs are not utility owned and characterized by high degree of uncertainty such as solar and wind, the distribution network may perform differently from the conventionally expected behaviors. How to dynamically and efficiently manage the power dispatch in a distribution network to balance the supply …

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Hybrid Power Saving Technique For Wireless Sensor Networks, Asama Alshaibi, Peter Vial, Montserrat Ros Jan 2012

Hybrid Power Saving Technique For Wireless Sensor Networks, Asama Alshaibi, Peter Vial, Montserrat Ros

Faculty of Engineering and Information Sciences - Papers: Part A

In wireless communication, idle listening, receiving and transmitting are the main source of consumption of energy. This paper gives an overview of several techniques used for wireless networks. We incorporated PSM and PC to gain the advantage of PSM (reduce idle listening) and PC (reduce receiving and transmitting power) and implemented them in the IEEE 802.15.4 protocol. The results show that the new hybrid technique saves more power than PSM and PC individually. © 2012 IEEE.

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Riemannian Manifolds In Noncommutative Geometry, Steven Lord, Adam Rennie, Joseph C. Varilly Jan 2012

Riemannian Manifolds In Noncommutative Geometry, Steven Lord, Adam Rennie, Joseph C. Varilly

Faculty of Engineering and Information Sciences - Papers: Part A

We present a definition of Riemannian manifold in noncommutative geometry. Using products of unbounded Kasparov modules, we show one can obtain such Riemannian manifolds from noncommutative spinc manifolds; and conversely, in the presence of a spinc structure. We also show how to obtain an analogue of Kasparov's fundamental class for a Riemannian manifold, and the associated notion of Poincaré duality. Along the way we clarify the bimodule and first-order conditions for spectral triples.

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Order-4 Quasi-Orthogonal Cooperative Communication In Stfc Mb-Ofdm Uwb, Zixuan Lin, Le Chung Tran, Farzad Safaei, Tadeusz A. Wysocki Jan 2012

Order-4 Quasi-Orthogonal Cooperative Communication In Stfc Mb-Ofdm Uwb, Zixuan Lin, Le Chung Tran, Farzad Safaei, Tadeusz A. Wysocki

Faculty of Engineering and Information Sciences - Papers: Part A

Recently, cooperative communication and Space-Time-Frequency-Codes (STFCs) have been introduced into the Multiband OFDM Ultra-Wideband (MB-OFDM UWB) to improve the reliability, data rate and system capacity. This paper proposes a cooperative communication scheme for a four source node MB-OFDM UWB system using Quasi-Orthogonal STFCs, which is referred to as order-4 Quasi-Orthogonal Cooperative Communication Scheme (4-QOCCS). Simulation results show that the proposed 4-QOCCS provides significantly better error performance over the conventional MB-OFDM UWB and our order-2 Orthogonal Cooperative Communication Scheme (2-OCCS) using the Alamouti STFCs, and even better than the order-4 Orthogonal Cooperative Communication Scheme (4-OCCS), which we have been recently proposed, …

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Parallel Computing Method For Intermodal Shipping Network Design, Zhiyuan Liu, Shuaian Wang, Qiang Meng Jan 2012

Parallel Computing Method For Intermodal Shipping Network Design, Zhiyuan Liu, Shuaian Wang, Qiang Meng

Faculty of Engineering and Information Sciences - Papers: Part A

This study aims to improve the efficiency of design technique for intermodal shipping network design, by virtue of parallel computing system. The existing methods for maritime liner shipping network design are mainly dealing with port-to-port demand. However, a big portion of the customers of a liner shipping company locate in the inland part. Thus, a holistic analysis is necessary to deal with the inland OD pairs, where the transport mode-change from inland transportation to maritime shipping is involved. This paper first reviews a solution method for the conversion of inland OD demand to port-to-port demand. Due to the size of …

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