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Articles 2191 - 2220 of 4868

Full-Text Articles in Physical Sciences and Mathematics

Nanometer-Scale Distance Measurements In Proteins Using Gd3+ Spin Labeling, Alexey Potapov, Hiromasa Yagi, Thomas Huber, Slobodan Jergic, Nicholas E. Dixon, Gottfried Otting, Daniella Goldfarb Jan 2010

Nanometer-Scale Distance Measurements In Proteins Using Gd3+ Spin Labeling, Alexey Potapov, Hiromasa Yagi, Thomas Huber, Slobodan Jergic, Nicholas E. Dixon, Gottfried Otting, Daniella Goldfarb

Faculty of Science - Papers (Archive)

Methods for measuring nanometer-scale distances between specific sites in proteins are essential for analysis of their structure and function. In this work we introduce Gd3+ spin labeling for nanometer-range distance measurements in proteins by high-field pulse electron paramagnetic resonance (EPR). To evaluate the performance of such measurements, we carried out four-pulse double-electron electron resonance (DEER) measurements on two proteins, p75ICD and τC14, labeled at strategically selected sites with either two nitroxides or two Gd3+ spin labels. In analogy to conventional site-directed spin labeling using nitroxides, Gd3+ tags that are derivatives of dipicolinic acid were covalently attached to cysteine thiol groups. …

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Synthesis Of Reaction-Ready 6,6 '-Biindole And 6,6 '-Biisatin Via Palladium(Ii)-Catalysed Intramolecular C-H Functionalisation, Allan B. Gamble, Paul A. Keller Jan 2010

Synthesis Of Reaction-Ready 6,6 '-Biindole And 6,6 '-Biisatin Via Palladium(Ii)-Catalysed Intramolecular C-H Functionalisation, Allan B. Gamble, Paul A. Keller

Faculty of Science - Papers (Archive)

The first synthesis of a 6,6'-biindole and 6,6'-biisatin scaffold is reported with the penultimate step being the formation of the di-heterocyclic ring by Pd(II)-catalysed intramolecular C-H functionalisation and Sandmeyer cyclisation, respectively.

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Female Choice For Males With Greater Fertilization Success In The Swedish Moor Frog, Rana Arvalis, Craig D. Sherman, Jorgen Sagvik, Mats M. Olsson Jan 2010

Female Choice For Males With Greater Fertilization Success In The Swedish Moor Frog, Rana Arvalis, Craig D. Sherman, Jorgen Sagvik, Mats M. Olsson

Faculty of Science - Papers (Archive)

Background: Studies of mate choice in anuran amphibians have shown female preference for a wide range of male traits despite females gaining no direct resources from males (i.e. non-resource based mating system). Nevertheless, theoretical and empirical studies have shown that females may still gain indirect genetic benefits from choosing males of higher genetic quality and thereby increase their reproductive success. Methodology/Principal Findings: We investigated two components of sexual selection in the Moor frog (Rana arvalis), precopulatory female choice between two males of different size ('large' vs. 'small'), and their fertilization success in sperm competition and in isolation. Females' showed no …

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Distribution Of Class 1 Integrons With Is26-Mediated Deletions In Their 3'-Conserved Segments In Escherichia Coli Of Human And Animal Origin., Fay E. Dawes, Alexander Kuzevski, Karl A Bettelheim, Michael A Hornitzky, Steven P Djordjevic, Mark J. Walker Jan 2010

Distribution Of Class 1 Integrons With Is26-Mediated Deletions In Their 3'-Conserved Segments In Escherichia Coli Of Human And Animal Origin., Fay E. Dawes, Alexander Kuzevski, Karl A Bettelheim, Michael A Hornitzky, Steven P Djordjevic, Mark J. Walker

Faculty of Science - Papers (Archive)

Class 1 integrons play a role in the emergence of multi-resistant bacteria by facilitating the recruitment of gene cassettes encoding antibiotic resistance genes. 512 E. coli strains sourced from humans (n = 202), animals (n = 304) and the environment (n = 6) were screened for the presence of the intI1 gene. In 31/79 integron positive E. coli strains, the gene cassette regions could not be PCR amplified using standard primers. DNA sequence analysis of 6 serologically diverse strains revealed atypical integrons harboured the dfrA5 cassette gene and only 24 bp of the integron 3'-conserved segment (CS) remained, due to …

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Development Of A Regional Habitat Classification Scheme For The Amirante Islands, Seychelles, Sarah Hamylton, Tom Spencer, Annelise Hagan Jan 2010

Development Of A Regional Habitat Classification Scheme For The Amirante Islands, Seychelles, Sarah Hamylton, Tom Spencer, Annelise Hagan

Faculty of Science - Papers (Archive)

A collaborative expedition between Khaled bin Sultan Living Oceans Foundation, Cambridge Coastal Research Unit and Seychelles Centre for Marine Research and Technology – Marine Parks Authority (SCMRT-MPA) was conducted to the southern Seychelles, western Indian Ocean, in January 2005. This resulted in a series of habitat maps of the reefs and reef islands of the Amirantes Archipelago, derived from remotely-sensed Compact Airborne Spectrographic Imager (CASI) data. The procedures used in map development, image processing techniques and field survey methods are outlined. Habitat classification, and regional-scale comparisons of relative habitat composition are described. The study demonstrates the use of remote sensing …

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Semisynthesis And Acetylcholinesterase Inhibitory Activity Of Stemofoline Alkaloids And Analogues, Kwankamol Sastraruji, Thanapat Sastraruji, Stephen G. Pyne, Alison T. Ung, Araya Jatisatienr, Wilford Lie Jan 2010

Semisynthesis And Acetylcholinesterase Inhibitory Activity Of Stemofoline Alkaloids And Analogues, Kwankamol Sastraruji, Thanapat Sastraruji, Stephen G. Pyne, Alison T. Ung, Araya Jatisatienr, Wilford Lie

Faculty of Science - Papers (Archive)

Semisynthesis of the known Stemona alkaloids oxystemofoline (7) and methoxystemofoline (8) has been achieved starting from (11Z)-1′,2′-didehydrostemofoline (6), which confirmed their structures and absolute configurations. The synthesis of (1′R)-hydroxystemofoline (9) helped establish this compound as a natural product from Stemona aphylla. (1′S)- Hydroxystemofoline (10) and a number of related analogues were also prepared. In a TLC bioautographic assay, 9 was found to be the most active acetylcholinesterase inhibitor, but it was not as active as galanthamine.

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Autonomous Greenhouse Gas Measurement System For Analysis Of Gas Migration On Landfill Sites, Stephen Beirne, Breda M. Kierman, Cormac Fay, Colum Foley, Brian Corcoran, Alan F. Smeaton, Dermot Diamond Jan 2010

Autonomous Greenhouse Gas Measurement System For Analysis Of Gas Migration On Landfill Sites, Stephen Beirne, Breda M. Kierman, Cormac Fay, Colum Foley, Brian Corcoran, Alan F. Smeaton, Dermot Diamond

Faculty of Science - Papers (Archive)

This paper describes the design, development and validation of an autonomous gas sensing platform prototype for monitoring of the greenhouse gases, methane (CH4) and carbon dioxide (CO2). The deployment undertaken for validation of the developed prototype monitored landfill gas migration to perimeter borehole wells on a landfill site. Target gas concentrations were captured via infrared gas sensors tuned for each target gas and data reported to an offsite data collection point at 12 hour intervals. This bespoke platform and the accompanying data recording and interface software provide a flexible alternative to the presently employed labor intensive, …

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Microevolution Of Group A Streptococci In Vivo: Capturing Regulatory Networks Engaged In Sociomicrobiology, Niche Adaptation, And Hypervirulence, Ramy K. Aziz, Rita G. Kansal, Bruce A. Aronow, William L. Taylor, Sarah L. Rowe, Michael Kubal, Gursharan S Chhatwal, Mark J. Walker, Malak Kotb Jan 2010

Microevolution Of Group A Streptococci In Vivo: Capturing Regulatory Networks Engaged In Sociomicrobiology, Niche Adaptation, And Hypervirulence, Ramy K. Aziz, Rita G. Kansal, Bruce A. Aronow, William L. Taylor, Sarah L. Rowe, Michael Kubal, Gursharan S Chhatwal, Mark J. Walker, Malak Kotb

Faculty of Science - Papers (Archive)

The onset of infection and the switch from primary to secondary niches are dramatic environmental changes that not only alter bacterial transcriptional programs, but also perturb their sociomicrobiology, often driving minor subpopulations with mutant phenotypes to prevail in specific niches. Having previously reported that M1T1 Streptococcus pyogenes become hypervirulent in mice due to selection of mutants in the covRS regulatory genes, we set out to dissect the impact of these mutations in vitro and in vivo from the impact of other adaptive events. Using a murine subcutaneous chamber model to sample the bacteria prior to selection or expansion of mutants, …

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Low Complexity Interference Aware Distributed Resource Allocation For Multi-Cell Ofdma Cooperative Relay Networks, Nidhal Odeh, Mehran Abolhasan, Farzad Safaei Jan 2010

Low Complexity Interference Aware Distributed Resource Allocation For Multi-Cell Ofdma Cooperative Relay Networks, Nidhal Odeh, Mehran Abolhasan, Farzad Safaei

Faculty of Informatics - Papers (Archive)

In this paper we focus on the subcarrier allocation for the uplink OFDMA based cooperative relay networks. Multiple cells were considered, each composed of a single base station (destination), multiple amplify and forward (AF) relay stations and multiple subscriber stations (sources). The effects of inter-cell interference (ICI) have been considered to optimize the subcarrier allocation with low complexity. The optimization problem aims to maximize the sum rate of all sources and at the same time maintain the fairness among them. Full channel state information (CSI) is assumed to be available at the base station. In the proposed algorithm the subcarrier …

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New Classes Of Orthogonal Designs Constructed From Complementary Sequences With Given Spread, Ilias Kotsireas, Christos Koukouvinos, Jennifer Seberry, D. Simos Jan 2010

New Classes Of Orthogonal Designs Constructed From Complementary Sequences With Given Spread, Ilias Kotsireas, Christos Koukouvinos, Jennifer Seberry, D. Simos

Faculty of Informatics - Papers (Archive)

In this paper we present, infinite families of new orthgonal designs, based on some weighing matrices of order 2n, weight 2n - k and spread o, constructed from two circlante and directed sequences.

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A Generalised Minimum Variance Controller For Time-Varying Mimo Linear Systems With Multiple Delays, Zheng Li, Christian Schmid Jan 2010

A Generalised Minimum Variance Controller For Time-Varying Mimo Linear Systems With Multiple Delays, Zheng Li, Christian Schmid

Faculty of Informatics - Papers (Archive)

In this paper we study optimal control of time-varying multi-input multi-output stochastic systems and develop a generalised minimum variance controller. The system to be controlled is described using a multi-input multi-output time-varying autoregressive moving average model that has multiple delays between the output and input. The controller minimises the sum of output tracking error variances and squared current control variables.

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A Feasibility Of Incorporating Pdas Into Problem-Based Learning Approach To Medical Education: An Overview, Rattiporn Luanrattana, Khin Than Win, John Fulcher Jan 2010

A Feasibility Of Incorporating Pdas Into Problem-Based Learning Approach To Medical Education: An Overview, Rattiporn Luanrattana, Khin Than Win, John Fulcher

Faculty of Informatics - Papers (Archive)

This paper explores the feasibility of incorporating personal digital assistants (PDAs) into problem-based learning (PBL) approach in medical education. Method: Database searched was conducted by using relevant keywords. From 1,317 relevant journal articles, 489 articles (37%) are related to the use of PDAs in medical settings, medical education and aspects regarding PDA use in both areas. The appropriate materials were input into NVivo 7 for analysis. Results: Five PDA functionalities (clinical-log, reference, personal information management, communication and special functions) and 8 factors (data security and information privacy, interoperability, scalability and network connectivity, education and training, technology comfort, electromagnetic interference, social …

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The Height Variance Range For One Frequency Fringe Pattern Profilometry, Yi Ding, Jiangtao Xi, Yanguang Yu, Joe F. Chicharo, Wenqing Cheng Jan 2010

The Height Variance Range For One Frequency Fringe Pattern Profilometry, Yi Ding, Jiangtao Xi, Yanguang Yu, Joe F. Chicharo, Wenqing Cheng

Faculty of Informatics - Papers (Archive)

The upper limit on the deepest step of the surface shape that can be accurately determined is an important performance measure associated with the fringe projection profilometry. This metric is evaluated as the variance of height between two adjacent pixels on a fringe patterns reflected from the object surface. This paper presents novel results on this metric based on the Nyquist sampling theorem originally developed in the area of communication theory. Compared to existing results, we indicate that the fringe width and digital image resolution also affect the height variance range significantly. This new result could be used to increase …

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An Abuse-Free Fair Contract-Signing Protocol Based On The Rsa Signature, Guilin Wang Jan 2010

An Abuse-Free Fair Contract-Signing Protocol Based On The Rsa Signature, Guilin Wang

Faculty of Informatics - Papers (Archive)

A fair contract-signing protocol allows two potentially mistrusted parities to exchange their commitments (i.e., digital signatures) to an agreed contract over the Internet in a fair way, so that either each of them obtains the other's signature, or neither party does. Based on the RSA signature scheme, a new digital contract-signing protocol is proposed in this paper. Like the existing RSA-based solutions for the same problem, our protocol is not only fair, but also optimistic, since the trusted third party is involved only in the situations where one party is cheating or the communication channel is interrupted. Furthermore, the proposed …

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Functionalities Of Free And Open Electronic Health Record Systems, Alejandro Enrique Flores Zuniga, Khin Than Win, Willy Susilo Jan 2010

Functionalities Of Free And Open Electronic Health Record Systems, Alejandro Enrique Flores Zuniga, Khin Than Win, Willy Susilo

Faculty of Informatics - Papers (Archive)

Objectives: The aim of this study was to examine open-source electronic health record (EHR) software to determine their level of functionalities according to the International Organization for Standardization (ISO) standards. Methods: ISO standards were used as a guideline to determine and describe the reference architecture and functionalities of a standard electronic health record system as well the environmental context for which the software has been built. Twelve open-source EHR systems were selected and evaluated according to two-dimensional criteria based on ISO/TS 18308:2004 functional requirements and ISO/TR 20514:2005 context of the EHR system. Results: Open EHR software programs mostly fulfill structural, …

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A Review Of Recent Investigations With Reference To Iec/Tr 61000-3-13 On Voltage Unbalance Emission Allocation, Prabodha Paranavithana, Upuli Jayatunga, Sarath Perera, Philip Ciufo Jan 2010

A Review Of Recent Investigations With Reference To Iec/Tr 61000-3-13 On Voltage Unbalance Emission Allocation, Prabodha Paranavithana, Upuli Jayatunga, Sarath Perera, Philip Ciufo

Faculty of Informatics - Papers (Archive)

The Technical Report IEC/TR 61000-3-13:2008 provides guiding principles for coordinating voltage unbalance between various voltage levels of a power system through the allocation of emission limits to installations. This report is based on widely accepted concepts and principles in relation to voltage unbalance. With regard to some of the key ideas used in this report, investigations have been carried out which have enabled the development of deeper insights making the voltage unbalance allocation process more comprehensive. The key aspects which have been considered in detail include: voltage unbalance which arises as a result of lines and voltage unbalance propagation in …

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Introducing Power System Voltage Droop As A New Concept For Harmonic Current Allocation, Robert A. Barr, V. J. Gosbell Jan 2010

Introducing Power System Voltage Droop As A New Concept For Harmonic Current Allocation, Robert A. Barr, V. J. Gosbell

Faculty of Informatics - Papers (Archive)

“Voltage Droop” is a new concept that has been developed primarily for use in the harmonic current allocation process. Voltage droop offers the opportunity to both vastly simplify the procedures required by the present IEC 61000.3.6 [1] guidelines for Stage 2 allocation and provide a solid theoretical base to this work. The voltage droop concept has also been found to provide a usefull theoretical basis for the harmonic standard IEEE 519[2]. While this paper develops the voltage droop concept using diagrams and words, the companion paper “Harmonic Allocation Following IEC Guidelines Using the Voltage Droop Concept”[3] contains a full critical …

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What's Your Contribution? An Online System For Assessing Each Member's Participation In Team Based Projects, Peter James Vial, Zhihao Zhang, Montserrat Ros, Christian Ritz, Geoffrey W. Trott Jan 2010

What's Your Contribution? An Online System For Assessing Each Member's Participation In Team Based Projects, Peter James Vial, Zhihao Zhang, Montserrat Ros, Christian Ritz, Geoffrey W. Trott

Faculty of Informatics - Papers (Archive)

Team based subjects in Engineering occur within the School of Electrical, Computer and Telecommunications Engineering in second and third year undergraduate degrees. In such subjects, students work in teams of between five and ten students to propose and develop engineered products for a target market place (chosen from different themes) with a small budget allocated for purchasing materials and devices. In practice, all students cannot make exactly the same contribution as each other, so a system to allocate marks for individual's contribution has been previously developed and employed within the school. This system is called the Fair Contribution Sheet (FCS) …

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Hybrid Operation Of Wind-Diesel-Fuel Cell Remote Area Power Supply System, Nishad Mendis, Kashem Muttaqi, Saad Sayeef, Sarath Perera Jan 2010

Hybrid Operation Of Wind-Diesel-Fuel Cell Remote Area Power Supply System, Nishad Mendis, Kashem Muttaqi, Saad Sayeef, Sarath Perera

Faculty of Informatics - Papers (Archive)

Due to the uncertainties associated with wind profiles, the load side voltage and frequency control of a wind dominated Remote Area Power Supply (RAPS) system is a challenging task. The performance of such a wind dominated hybrid RAPS system consisting of a diesel generator, fuel cell system, dump load and mains load is investigated in this paper. Integrating a fuel cell into the RAPS system enables the diesel usage to be kept at its minium level while avoiding operation of the diesel generator at low load factor. The diesel generator is used to provide the reactive power requirement of the …

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Desired And Received Customer Value Models In Logistics Service Outsourcing, Yeni Sumantri, Sim Kim Lau Jan 2010

Desired And Received Customer Value Models In Logistics Service Outsourcing, Yeni Sumantri, Sim Kim Lau

Faculty of Informatics - Papers (Archive)

The customer value literature offers diverse meanings of customer value concept. The significant differences among these meanings rest on interpretation or understanding of customer value. Generally, there are two major concepts of customer value. The first is desired value and the second is received value. Desired value refers to the value that customer wants to receive from product-vendor-customer interactions. Received value refers to the value that is actually experienced through product-vendor-customer interactions. Majority of research tends to focus on the received value concept. Although these two concepts are complementary, no research investigating both concepts has been conducted. This paper explores …

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Control Coordination Of A Wind Turbine Generator And A Battery Storage Unit In A Remote Area Power Supply System, Nishad Mendis, Kashem Muttaqi, Saad Sayeef, Sarath Perera Jan 2010

Control Coordination Of A Wind Turbine Generator And A Battery Storage Unit In A Remote Area Power Supply System, Nishad Mendis, Kashem Muttaqi, Saad Sayeef, Sarath Perera

Faculty of Informatics - Papers (Archive)

A novel hybrid Remote Area Power Supply (RAPS) system consisting of a Doubly Fed Induction Generator (DFIG) based wind turbine and a battery Energy Storage System (ESS) is investigated in this paper. The proposed RAPS system also consists of a dummy load and its controller. The battery energy storage system is used as a buffer which is connected to the DC link of the DFIG. The dummy load which is connected to the AC side of the system is used to absorb the energy associated with over generation, a situation which cannot be handled through the battery system. Control coordination …

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Magnetic Phase Transition In Mnfep0.5as0.4si 0.1, Jianli Wang, Stewart J. Campbell, O Tegus, E Bruck, S X. Dou Jan 2010

Magnetic Phase Transition In Mnfep0.5as0.4si 0.1, Jianli Wang, Stewart J. Campbell, O Tegus, E Bruck, S X. Dou

Australian Institute for Innovative Materials - Papers

We have carried out a detailed investigation of the magnetic phase transition in MnFeP0.5As0.4Si0.1. Temperature hysteresis has been observed in the variable temperature magnetization curves (Bappl = 0.01 T) with TC W ~ 302 K on warming and TC C ~ 292 K on cooling. The first order nature of this transition in MnFeP0.5As0.4Si0.1 is confirmed by the negative slope obtained from isotherms of M2 versus B/M around the critical temperature. Linear thermal expansion measurements reveal a large volume change, ΔV/V∼8.7×10-3, at the …

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The Control Of Time-Dependent Buckling Patterns In Thin Confined Elastomer Film, Brad Winton, Mihail Ionescu, S X. Dou Jan 2010

The Control Of Time-Dependent Buckling Patterns In Thin Confined Elastomer Film, Brad Winton, Mihail Ionescu, S X. Dou

Australian Institute for Innovative Materials - Papers

Low energy metal ion implantation has been used to combine an easy “bottom-up” way of creating and tuning different topographic structures on submicron to micrometer scales with the embedding of a metallic element-rich functionalized layer at the surface for a variety of scientific and technological applications. The self-organizing and complex patterns of functionalized topographic structures are highly dependent on the implanted metal ion species, variations in the geometric confinement of the buckled areas on the larger unmodified elastomer film, and the boundary conditions of the buckled regions. Systematic investigations of these dependencies have been carried out via optical and atomic …

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A Sign Of Field-Induced First Order Magnetic State Transition And Giant Reversible Magnetocaloric Effect In Cobalt Hydroxide Nanosheets, Precious Shamba, Rong Zeng, J Q Wang, S X. Dou Jan 2010

A Sign Of Field-Induced First Order Magnetic State Transition And Giant Reversible Magnetocaloric Effect In Cobalt Hydroxide Nanosheets, Precious Shamba, Rong Zeng, J Q Wang, S X. Dou

Australian Institute for Innovative Materials - Papers

We report the synthesis of β−Co(OH)2 nanosheets using microwave assisted hydrothermal and conventional chemical reaction methods. A magnetic transition at an onset temperature, T1 ~ 96 K, and a sign of antiferromagnetic state transition at the Néel temperature, TN=9~10 K, can be determined from M-T curves and M-H curves magnetic properties investigation. It is found that a sign of field-induced first order transition below 9 K, act as a role of reversing the magnetocaloric effect from negative to positive value. The large reversible magnetic-entropy change (∆SM) of 17 J/kg K around 11 K for …

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Preliminary Sample Design For The New Zealand Health Survey 2010, Robert Graham Clark Jan 2010

Preliminary Sample Design For The New Zealand Health Survey 2010, Robert Graham Clark

Faculty of Informatics - Papers (Archive)

This report describes the choice of the preliminary design for the New Zealand Health Survey, to be implemented from 2011. The survey will use computer assisted personal interviewing. The sample will be selected using a multi-stage area design. The selected sample size will be around 12,000 people per year. This is envisaged as sufficient to provide adequate precision for estimates of key prevalences for adults and children. The main objectives of the sample design are: • The design should support analysis of the survey by multiple users, which implies avoiding great variation in estimation weights. • Estimates for children and …

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Definition Of A Description Language For Business Service Decomposition, Lam-Son Le, Aditya K. Ghose, Evan D. Morrison Jan 2010

Definition Of A Description Language For Business Service Decomposition, Lam-Son Le, Aditya K. Ghose, Evan D. Morrison

Faculty of Informatics - Papers (Archive)

In the last few years, service-oriented computing has become an emerging research topic in response to the shift from product-oriented economy to service-oriented economy and the move from focusing on software/system development to addressing business-IT alignment. From an IT perspective, there is a proliferation of methods and languages for describing Web services. There has not been as much work in defining languages or ontologies for describing services from business perspectives. In this paper, we analyze the landscape of service representation and discuss the needs of having a description language for business services. By leveraging existing work on describing service capabilities …

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Strategy Representation Using An I*-Like Notation, Lam-Son Le, Bingyu Zhang, Aditya K. Ghose Jan 2010

Strategy Representation Using An I*-Like Notation, Lam-Son Le, Bingyu Zhang, Aditya K. Ghose

Faculty of Informatics - Papers (Archive)

Assessing and achieving alignment between an organization’s strategies and its IT/business functions has long been recognized as a critically important question. This paper reports on a project that seeks to overturn established management orthodoxy by establising that strategies can be adequately modeled using conceptual modeling notations and that methodological and tool support can be provided for the task of assessing and achieving alignment between the strategies of an organization and its service offerings. A key element of this enterprise has been the design of SML - the Strategy Modeling Language. This paper presents an interim report from this project that …

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A Particle Swarm Optimization Algorithm Based On Orthogonal Design, Jie Yang, Abdesselam Bouzerdoum, Son Lam Phung Jan 2010

A Particle Swarm Optimization Algorithm Based On Orthogonal Design, Jie Yang, Abdesselam Bouzerdoum, Son Lam Phung

Faculty of Informatics - Papers (Archive)

The last decade has witnessed a great interest in using evolutionary algorithms, such as genetic algorithms, evolutionary strategies and particle swarm optimization (PSO), for multivariate optimization. This paper presents a hybrid algorithm for searching a complex domain space, by combining the PSO and orthogonal design. In the standard PSO, each particle focuses only on the error propagated back from the best particle, without “communicating” with other particles. In our approach, this limitation of the standard PSO is overcome by using a novel crossover operator based on orthogonal design. Furthermore, instead of the “generating-and-updating” model in the standard PSO, the elitism …

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Adaptive Hierarchical Architecture For Visual Recognition, Fok Hing Chi Tivive, Abdesselam Bouzerdoum, Son Lam Phung, Khan M. Iftekharuddin Jan 2010

Adaptive Hierarchical Architecture For Visual Recognition, Fok Hing Chi Tivive, Abdesselam Bouzerdoum, Son Lam Phung, Khan M. Iftekharuddin

Faculty of Informatics - Papers (Archive)

We propose a new hierarchical architecture for visual pattern classification. The new architecture consists of a set of fixed, directional filters and a set of adaptive filters arranged in a cascade structure. The fixed filters are used to extract primitive features such as orientations and edges that are present in a wide range of objects, whereas the adaptive filters can be trained to find complex features that are specific to a given object. Both types of filters are based on the biological mechanism of shunting inhibition. The proposed architecture is applied to two problems: pedestrian detection and car detection. Evaluation …

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Automatic Human Motion Classification From Doppler Spectrograms, Fok Hing Chi Tivive, Abdesselam Bouzerdoum, Moeness G. Amin Jan 2010

Automatic Human Motion Classification From Doppler Spectrograms, Fok Hing Chi Tivive, Abdesselam Bouzerdoum, Moeness G. Amin

Faculty of Informatics - Papers (Archive)

No abstract provided.

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