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2007

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Articles 3751 - 3780 of 6758

Full-Text Articles in Physical Sciences and Mathematics

Near Real-Time Extract, Transform And Load, Wei-Chwen Soon Wilson Feb 2007

Near Real-Time Extract, Transform And Load, Wei-Chwen Soon Wilson

Regis University Student Publications (comprehensive collection)

The integrated Public Health Information System (iPHIS) system requires a maximum one hour data latency for reporting and analysis. The existing system uses trigger-based replication technology to replicate data from the source database to the reporting database. The data is transformed into materialized views in an hourly full refresh for reporting. This solution is Central Processing Unit (CPU) intensive and is not scaleable. This paper presents the results of a pilot project which demonstrated that near real-time Extract, Transform and Load (ETL), using conventional ETL process with Change Data Capture (CDC), can replace this existing process to improve performance and …

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Cost-Effective Engineering Of A Small-Scale Bioreactor, John Tansey, Sadie R. Bartholomew Feb 2007

Cost-Effective Engineering Of A Small-Scale Bioreactor, John Tansey, Sadie R. Bartholomew

Chemistry Faculty Scholarship

Several methods exist for increasing the scale of cell culture in the laboratory. While these methods provide significant increases in biomass, they are often prohibitively expensive for many laboratories. We have engineered a small-scale bioreactor with a novel means of introducing oxygen through the catalytic breakdown of hydrogen peroxide using a manganese oxide catalyst. We have also adapted and modified an existing assay for dissolved oxygen to be compatible with culture conditions. In this system we have been able to culture CHO cells at densities of up to 107 cells/mL without the use of automated feedback systems.

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Clustering And Combinatorial Optimization In Recursive Supervised Learning, Kiruthika Ramanathan, Sheng Uei Guan Feb 2007

Clustering And Combinatorial Optimization In Recursive Supervised Learning, Kiruthika Ramanathan, Sheng Uei Guan

Research Collection School Of Computing and Information Systems

The use of combinations of weak learners to learn a dataset has been shown to be better than the use of a single strong learner. In fact, the idea is so successful that boosting, an algorithm combining several weak learners for supervised learning, has been considered to be the best off the shelf classifier. However, some problems still exist, including determining the optimal number of weak learners and the over fitting of data. In an earlier work, we developed the RPHP algorithm which solves both these problems by using a combination of global search, weak learning and pattern distribution. In …

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Lecture Video Enhancement And Editing By Integrating Posture, Gesture, And Text, Feng Wang, Chong-Wah Ngo, Ting-Chuen Pong Feb 2007

Lecture Video Enhancement And Editing By Integrating Posture, Gesture, And Text, Feng Wang, Chong-Wah Ngo, Ting-Chuen Pong

Research Collection School Of Computing and Information Systems

This paper describes a novel framework for automatic lecture video editing by gesture, posture, and video text recognition. In content analysis, the trajectory of hand movement is tracked and the intentional gestures are automatically extracted for recognition. In addition, head pose is estimated through overcoming the difficulties due to the complex lighting conditions in classrooms. The aim of recognition is to characterize the flow of lecturing with a series of regional focuses depicted by human postures and gestures. The regions of interest (ROIs) in videos are semantically structured with text recognition and the aid of external documents. By tracing the …

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Quality Of Service Routing Strategy Using Supervised Genetic Algorithm, Zhaoxia Wang, Yugeng Sun, Zhiyong Wang, Huayu Shen Feb 2007

Quality Of Service Routing Strategy Using Supervised Genetic Algorithm, Zhaoxia Wang, Yugeng Sun, Zhiyong Wang, Huayu Shen

Research Collection School Of Computing and Information Systems

A supervised genetic algorithm (SGA) is proposed to solve the quality of service (QoS) routing problems in computer networks. The supervised rules of intelligent concept are introduced into genetic algorithms (GAs) to solve the constraint optimization problem. One of the main characteristics of SGA is its searching space can be limited in feasible regions rather than infeasible regions. The superiority of SGA to other GAs lies in that some supervised search rules in which the information comes from the problems are incorporated into SGA. The simulation results show that SGA improves the ability of searching an optimum solution and accelerates …

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Fragmentation Of Methyl Chloride Studied By Partial Positive And Negative Ion Yield Spectroscopy, D. Ceolin, Maria Novella Piancastelli, Renaud Guillemin, Wayne C. Stolte, S-W Yu, Oliver Hemmers, Dennis W. Lindle Feb 2007

Fragmentation Of Methyl Chloride Studied By Partial Positive And Negative Ion Yield Spectroscopy, D. Ceolin, Maria Novella Piancastelli, Renaud Guillemin, Wayne C. Stolte, S-W Yu, Oliver Hemmers, Dennis W. Lindle

Environmental Studies Faculty Publications

The authors present partial-ion-yield experiments on the methyl chloride molecule excited in the vicinity of the Cl2p and C1s inner shells. A large number of fragments, cations produced by dissociation or recombination processes, as well as anionic species, have been detected. Although the spectra exhibit different intensity distributions depending on the core-excited atom, general observations include strong site-selective fragmentation along the C–Cl bond axis and a strong intensity dependence of transitions involving Rydberg series on fragment size.

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Inside Unlv, Diane Russell, Shane Bevell, David Ashley, Lori Bachand, Grace Russell, Mamie Peers Feb 2007

Inside Unlv, Diane Russell, Shane Bevell, David Ashley, Lori Bachand, Grace Russell, Mamie Peers

Inside UNLV

No abstract provided.

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Numerical Methods With Ms Excel, M. El-Gebeily, B. Yushau Feb 2007

Numerical Methods With Ms Excel, M. El-Gebeily, B. Yushau

The Mathematics Enthusiast

In this note we show how MS Excel can be used to to perform numerical Integration, specifically Trapezoidal Rule and Simson’s rule. Futhermore, we illustrate how to generate Lagranges Interpolation polynomial.

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Tme Volume 4, Number 1 Feb 2007

Tme Volume 4, Number 1

The Mathematics Enthusiast

No abstract provided.

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Investigation Of A "Wall" Wave Event, F. Li, G. R. Swenson, A. Z. Liu, Michael J. Taylor, Y. Zhao Feb 2007

Investigation Of A "Wall" Wave Event, F. Li, G. R. Swenson, A. Z. Liu, Michael J. Taylor, Y. Zhao

All Physics Faculty Publications

A bright airglow event was observed at Maui, Hawaii, on the night of 11–12 August 2004 with multiple instruments including a Na wind/temperature lidar, an airglow imager, and a mesospheric temperature mapper. The characteristics of this event were investigated with measurements from these instruments. Analysis showed that this event was caused by a large-amplitude, upward-propagating gravity wave with a period of about 4–5 hours and a vertical wavelength of about 20 km, i.e., a ‘‘wall’’ wave. This wall wave induced dramatic changes in temperature (60 K), airglow intensity (doubled in the OH and tripled in the O2 emissions), and Na …

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A Novel Intra-Cavity Lens Design For Compact High Efficiency Tapered Laser Diodes, F. K. Lau, Chyng Wen Tee, R. V. Penty, I. H. White, N. Michel, M. Krakowski Feb 2007

A Novel Intra-Cavity Lens Design For Compact High Efficiency Tapered Laser Diodes, F. K. Lau, Chyng Wen Tee, R. V. Penty, I. H. White, N. Michel, M. Krakowski

Research Collection Lee Kong Chian School Of Business

An integrated parabolic lens capable of introducing a diverging effect to the optical mode propagating within the cavity of a tapered laser is proposed and demonstrated. This idea allows broader high-power beams to be generated by shorter cavities. Diverging lenses with etch depths of 0.13 and 0.27 mum are implemented, with 12 (9.5%) and 16.8 mum (13.3%) overall broadening of the near-fields widths measured at 1/e2 intensity. The peak output power as well as the threshold current is found to increase following the lens etching process, confirming the beneficial broadening effect introduced by the diverging lens.

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Adult Students' Reasoning In Geometry: Teaching Mathematics Through Collaborative Problem Solving In Teacher Education, Raymond Bjuland Feb 2007

Adult Students' Reasoning In Geometry: Teaching Mathematics Through Collaborative Problem Solving In Teacher Education, Raymond Bjuland

The Mathematics Enthusiast

This article reports research that is concerned with pre-service teachers2 working collaboratively in a problem-solving context without teacher involvement. The aim is to focus on the students’ heuristic strategies employed in the solution process while working on two problems in geometry. Two episodes from the dialogues in one group of students with limited mathematical backgrounds have been chosen to illustrate some mathematical movement throughout the group meetings, from working with the first problem to working with the second one. The findings reveal that three categories of strategies, visualising, monitoring, and questioning, play an important role in order to make progress …

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Erratum: An Improvement On The Article Taxi Cab Geometry: History And Applications, Tmme, Vol2, No.1, P. 38 - 64, Benjamin Urland Feb 2007

Erratum: An Improvement On The Article Taxi Cab Geometry: History And Applications, Tmme, Vol2, No.1, P. 38 - 64, Benjamin Urland

The Mathematics Enthusiast

As a high school student from Germany I did a Mathematics research paper entitled Taxicab Geometry: Fundamentals and Applications. During my research I found the article Taxicab Geometry: History and Applications by Chip Reinhardt which was published in the edition Vol.2, no. 1 (p. 38 – 64) of this journal. The article was very helpful for my coursework and I’d like to compliment the author and everyone who is involved in the journal on their work. In my coursework I created an application example similar to the one Chip Reinhardt used in his article. I solved my example in the …

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The Interplay Of Processing Efficiency And Working Memory With The Development Of Metacognitive Performance In Mathematics, Areti Panaoura Feb 2007

The Interplay Of Processing Efficiency And Working Memory With The Development Of Metacognitive Performance In Mathematics, Areti Panaoura

The Mathematics Enthusiast

The present study outlines a specific three level hierarchy of the cognitive system and especially the relations of specific cognitive and metacognitive processes in mathematics. The emphasis is on the impact of the development of processing efficiency and working memory ability on the development of metacognitive abilities and mathematical performance. We had used instruments measuring pupils´ metacognitive ability, mathematical performance, working memory and processing efficiency. We administered them to 126 pupils (8-11 years old) three times, with breaks of 3-4 months between them. Results indicated that the development of each of the abilities was affected by the state of the …

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Students' Conceptions Of Limits: High Achievers Versus Low Achievers, Kristina Juter Feb 2007

Students' Conceptions Of Limits: High Achievers Versus Low Achievers, Kristina Juter

The Mathematics Enthusiast

Learning an advanced mathematical concept, limits of functions in this case, is not a linear development equal for all learners. Intentions and abilities influence students’ learning paths and results. Students’ learning developments of limits were studied in terms of concept images (Tall & Vinner, 1981) in the sense that their actions, such as problem solving and reasoning, were considered traces of their mental representations of concepts. High achievers’ developments were compared to low achievers’ developments to for the duration of a semester to reveal differences and similarities.

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The Need For An Inclusive Framework For Students' Thinking In School Geometry, Jaguthsing Dindyal Feb 2007

The Need For An Inclusive Framework For Students' Thinking In School Geometry, Jaguthsing Dindyal

The Mathematics Enthusiast

This study is the outcome of a research that investigated how students who were assigned varying levels of geometric thinking attempted problems requiring some amount of algebraic thinking in geometry. The study reports that students’ thinking in geometry also requires facility with algebra and as such there is a need for a framework that provides a more inclusive view of what constitutes geometric thinking in school mathematics.

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Kerr-Mcgee's Bonanza Area Environmental Assessment And Biological Assessment, U.S. Department Of The Interior, Bureau Of Land Management Feb 2007

Kerr-Mcgee's Bonanza Area Environmental Assessment And Biological Assessment, U.S. Department Of The Interior, Bureau Of Land Management

All U.S. Government Documents (Utah Regional Depository)

No abstract provided.

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Feral Swine Management For Conservation Of An Imperiled Wetland Habitat: Florida’S Vanishing Seepage Slopes, Richard M. Engeman, Amanda Stevens, John Allen, Jon Dunlap, Marty Dunlap, Dennis Teague, Bernice Constantin Feb 2007

Feral Swine Management For Conservation Of An Imperiled Wetland Habitat: Florida’S Vanishing Seepage Slopes, Richard M. Engeman, Amanda Stevens, John Allen, Jon Dunlap, Marty Dunlap, Dennis Teague, Bernice Constantin

United States Department of Agriculture Wildlife Services: Staff Publications

Only 1% of the original extent of Florida’s seepage slope habitat remains, with Eglin Air Force Base containing some of the largest tracts. Feral swine damage is one of the greatest threats to this wetland habitat.We conducted a multi-year study to evaluate the impacts of sport hunting and supplemental swine removal on damage to seepage slopes. Prior to initiation of removal in 2003, swine damage to seepage slopes in the portion of the base closed to hunting averaged 25.0%, over twice the 10.9% losses in the portion open to hunting. After less than one year of supplemental removal, damage in …

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Mountain Beaver Home Ranges, Habitat Use, And Population Dynamics In Washington, W. M. Arjo, R. E. Huenefeld, D. L. Nolte Feb 2007

Mountain Beaver Home Ranges, Habitat Use, And Population Dynamics In Washington, W. M. Arjo, R. E. Huenefeld, D. L. Nolte

United States Department of Agriculture Wildlife Services: Staff Publications

The mountain beaver (Aplodontia rufa (Rafinesque, 1817)), endemic to western North America, is the only extant member of the family Aplodontidae. Limited information on movements and habitat use throughout the species' range is available. We radio-collared 41 mountain beavers to determine home ranges, dispersal, habitat use, and population densities on two managed forest sites in coastal Washington. Both sites were recently harvested for timber. The Donovan site (16.6 ha) was treated with herbicide before seedling planting and the Sylvia site (8.9 ha) was not treated. Mountain beaver home ranges (Donovan: 4.18 ± 0.81 ha; Sylvia: 1.39 ± 0.4 ha) …

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Influence Of Land Use And Climate On Wetland Breeding Birds In The Prairie Pothole Region Of Canada, G. M. Forcey, G. M. Linz, W. E. Thogmartin, W. J. Bleier Feb 2007

Influence Of Land Use And Climate On Wetland Breeding Birds In The Prairie Pothole Region Of Canada, G. M. Forcey, G. M. Linz, W. E. Thogmartin, W. J. Bleier

United States Department of Agriculture Wildlife Services: Staff Publications

Bird populations are influenced by a variety of factors at both small and large scales that range from the presence of suitable nesting habitat, predators, and food supplies to climate conditions and land-use patterns. We evaluated the influences of regional climate and land-use variables on wetland breeding birds in the Canada section of Bird Conservation Region 11 (CA-BCR1 I ) , the Prairie Potholes. We used bird abundance data from the North American Breeding Bird Survey, land-use data from the Prairie Farm Rehabilitation Administration, and weather data from the National Climatic Data and Information Archive to model effects of regional …

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Separated Lie Models And The Homotopy Lie Algebra, Peter G. Bubenik Feb 2007

Separated Lie Models And The Homotopy Lie Algebra, Peter G. Bubenik

Mathematics and Statistics Faculty Publications

Abstract. A simply connected topological space X has homotopy Lie algebra π∗(ΩX) ⊗ Q. Following Quillen, there is a connected differential graded free Lie algebra (dgL) called a Lie model, which determines the rational homotopy type of X, and whose homology is isomorphic to the homotopy Lie algebra. We show that such a Lie model can be replaced with one that has a special property we call separated. The homology of a separated dgL has a particular form which lends itself to calculations. 1.

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Learning Mathematics With Understanding: A Critical Consideration Of The Learning Principle In The Principles And Standards For School Mathematics, Andreas J. Stylianides, Gabriel J. Stylianides Feb 2007

Learning Mathematics With Understanding: A Critical Consideration Of The Learning Principle In The Principles And Standards For School Mathematics, Andreas J. Stylianides, Gabriel J. Stylianides

The Mathematics Enthusiast

Learning with understanding has increasingly received attention from educators and psychologists, and has progressively been elevated to one of the most important goals for all students in all subjects. However, the realization of this goal has been problematic, especially in the domain of mathematics. To this might have contributed the fact that, although the vision of students learning mathematics with understanding has often appeared in curriculum frameworks, this vision has tended to be poorly described, thereby offering limited support to curriculum development and policy. The Learning Principle in the Principles and Standards for School Mathematics, an influential mathematics curriculum framework …

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Inference Of Node And Edge Replacement Graph Grammars, Jacek Kukluk Feb 2007

Inference Of Node And Edge Replacement Graph Grammars, Jacek Kukluk

Computer Science and Engineering Dissertations

In this dissertation we study the inference of node and edge replacement graph grammars. The approach is based on previous research in frequent isomorphic subgraphs discovery. We extend the search for frequent subgraphs by checking for overlap among the instances of the subgraphs in the input graph. If subgraphs overlap by one node, we propose a node replacement graph grammar production. If subgraphs overlap by two nodes or two nodes and an edge, we propose an edge replacement graph grammar production. We also can infer a hierarchy of productions by compressing portions of a graph described by a production and …

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Stratification Of Southern Georgia Streams For Rapid Bioassessment Focusing On Differences In Structure And Function Of Black Water And Clear Water Streams, Salini Pradeep Pillai Feb 2007

Stratification Of Southern Georgia Streams For Rapid Bioassessment Focusing On Differences In Structure And Function Of Black Water And Clear Water Streams, Salini Pradeep Pillai

Theses and Dissertations

As part of a rapid bioassessment project for the state of Georgia, relatively unimpaired reference streams and impaired sites were sampled for biological, chemical and physical parameters, and macroinvertebrates were identified. The metrics, biological, physical and chemical metrics, were selected using Ecological Data Application System Version 3.3.2k (EDAS). Discrimination efficiency and correlations were performed to determine the best metrics that separated impaired streams from reference streams and later on to form the index of stream water quality. Principal components analysis of the selected metrics showed that some of the blackwater reference streams and clearwater reference streams are randomly placed over …

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The Structure And Function Of Small Nucleolar Ribonucleoproteins, Steve Reichow, Tomoko Hamma, Adrian R. Ferré-D’Amaré, Gabriele Varani Feb 2007

The Structure And Function Of Small Nucleolar Ribonucleoproteins, Steve Reichow, Tomoko Hamma, Adrian R. Ferré-D’Amaré, Gabriele Varani

Chemistry Faculty Publications and Presentations

Eukaryotes and archaea use two sets of specialized ribonucleoproteins (RNPs) to carry out sequencespecific methylation and pseudouridylation of RNA, the two most abundant types of modifications of cellular RNAs. In eukaryotes, these protein–RNA complexes localize to the nucleolus and are called small nucleolar RNPs (snoRNPs), while in archaea they are known as small RNPs (sRNP). The C/D class of sno(s)RNPs carries out ribose- 20-O-methylation, while the H/ACA class is responsible for pseudouridylation of their RNA targets. Here, we review the recent advances in the structure, assembly and function of the conserved C/D and H/ACA sno(s)RNPs. Structures of each of the …

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Moving-Object Detection, Association, And Selection In Home Videos, Zailiang Pan, Chong-Wah Ngo Feb 2007

Moving-Object Detection, Association, And Selection In Home Videos, Zailiang Pan, Chong-Wah Ngo

Research Collection School Of Computing and Information Systems

Due to the prevalence of digital video camcorders, home videos have become an important part of life-logs of personal experiences. To enable efficient video parsing, a critical step is to automatically extract objects, events and scene characteristics present in videos. This paper addresses the problem of extracting objects from home videos. Automatic detection of objects is a classical yet difficult vision problem, particularly for videos with complex scenes and unrestricted domains. Compared with edited and surveillant videos, home videos captured in uncontrolled environment are usually coupled with several notable features such as shaking artifacts, irregular motions, and arbitrary settings. These …

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Logistics Network Design With Supplier Consolidation Hubs And Multiple Shipment Options, Michelle L. F. Cheong, Rohit Bhatnagar, Stephen C. Graves Feb 2007

Logistics Network Design With Supplier Consolidation Hubs And Multiple Shipment Options, Michelle L. F. Cheong, Rohit Bhatnagar, Stephen C. Graves

Research Collection School Of Computing and Information Systems

An important service provided by third-party logistics (3PL) firms is to manage the inbound logistics of raw materials and components from multiple suppliers to several manufacturing plants. A key challenge for these 3PL firms is to determine how to coordinate and consolidate the transportation flow, so as to get the best overall logistics performance. One tactic is to establish consolidation hubs that collect shipments from several suppliers, consolidate these shipments, and direct the consolidated shipments to the appropriate manufacturing plant. We consider the network design problem to implement this tactic, namely deciding the number, location and operation of consolidation hubs …

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Towards Efficient Planning For Real World Partially Observable Domains, Pradeep R. Varakantham Feb 2007

Towards Efficient Planning For Real World Partially Observable Domains, Pradeep R. Varakantham

Research Collection School Of Computing and Information Systems

My research goal is to build large-scale intelligent systems (both single- and multi-agent) that reason with uncertainty in complex, real-world environments. I foresee an integration of such systems in many critical facets of human life ranging from intelligent assistants in hospitals to offices, from rescue agents in large scale disaster response to sensor agents tracking weather phenomena in earth observing sensor webs, and others. In my thesis, I have taken steps towards achieving this goal in the context of systems that operate in partially observable domains that also have transitional (non-deterministic outcomes to actions) uncertainty. Given this uncertainty, Partially Observable …

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A Grassroots Vehicle For Sustainable Energy: The Conservation Reserve Program & Renewable Energy, Jared Wiesner Feb 2007

A Grassroots Vehicle For Sustainable Energy: The Conservation Reserve Program & Renewable Energy, Jared Wiesner

William & Mary Environmental Law and Policy Review

No abstract provided.

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Management Of The Houtman Abrolhos System. A Draft Review 2007 - 2017, Department Of Fisheries (Western Australia) On Advice From The Abrolhos Islands Management Advisory Committee Feb 2007

Management Of The Houtman Abrolhos System. A Draft Review 2007 - 2017, Department Of Fisheries (Western Australia) On Advice From The Abrolhos Islands Management Advisory Committee

Fisheries management papers

This review contains a brief description of the Abrolhos System and its special values. It also states the goal and principal objectives for management during the next ten years (2006-2016), along with updated strategies to achieve these objectives. The document succinctly outlines the direction for multiple use management of the Houtman Abrolhos Islands as determined by the Abrolhos Islands Management Advisory Committee (AIMAC). The Committee’s role is to advise the Minister for Fisheries on management of the Abrolhos Islands and the Abrolhos Islands Fish Habitat Protection Area.

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