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2000

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Is It Time For Cooperative Learning To Enter American Classrooms?, Donna Sewell May 2000

Is It Time For Cooperative Learning To Enter American Classrooms?, Donna Sewell

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Education's raison d'etre is to prepare students with the skills necessary for a productive and happy life within society. The fact that many educational institutions are experiencing a disconcerting number of students dropping out of school (and sometimes life itself) may be an indicator that this preparation is less than adequate in meeting their needs. In fact, the needs of a high school graduate today are so different and far-reaching than what they were 30-50 years ago, it will be easier to group them according to a change in economics, transformed demographics and changes in social situations and practices. Each …

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Virulence Of Cryphonectria Hypoviruses From Previous Release Sites, Paul Henry Chaloux May 2000

Virulence Of Cryphonectria Hypoviruses From Previous Release Sites, Paul Henry Chaloux

Graduate Theses, Dissertations, and Problem Reports (ETD)

In 1994 and 1995, Cryphonectria parasitica isolates singly or doubly infected with hypoviruses in the CHV3 genus, and lacking distinctive morphological abnormalities, were recovered near plots formerly used to release hypoviruses. This study tested the hypothesis that North American hypoviruses are evolving decreased virulence, and investigated hypovirus interactions affecting virulence in double-infections. Families of single conidial progeny (SCP), differing in infection status, and derived from six recovered, three release, and three comparison isolates were tested in three field experiments. All release isolates and four recovered isolates were debilitated by their CHV3-gh2-type hypoviruses. CHV3-sr2-type hypoviruses never caused debilitation. In family SG3-2 …

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Re-Evaluation Of Wave Transmission Coefficients For Submerged Breakwater Physical Models, Harry Charles Friebel May 2000

Re-Evaluation Of Wave Transmission Coefficients For Submerged Breakwater Physical Models, Harry Charles Friebel

Theses and Dissertations

Increasing interest in utilizing submerged breakwaters and artificial reefs for shoreline stabilization requires accurate models and relationships for predicting wave attenuation. The objective of this paper is to develop an empirical model as an improvement to existing wave transmission models. This will provide the required design criteria for use in future submerged breakwater designs. An extensive study of existing literature on submerged breakwaters and associated wave attenuation was performed, followed by a detailed statistical analysis of existing data sets to determine an alternate model for the wave transmission coefficient. A total of five data sets from physical model studies were …

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Structural And Magnetic Properties Of Mechanically Milled Smco5:C, E. M. Kirkpatrick, Diandra Leslie-Pelecky May 2000

Structural And Magnetic Properties Of Mechanically Milled Smco5:C, E. M. Kirkpatrick, Diandra Leslie-Pelecky

Diandra Leslie-Pelecky Publications

Mechanically milling SmCo5 powder significantly increases coercivity and remanence ratio by introducing defects; however, these defects can be removed by room-temperature aging, with a resultant decrease in coercivity. A series of (SmCo5) x:C1–x (0.15 ≤ x ≤1) samples has been fabricated to investigate the effect of C on oxidation protection and magnetic properties. SmCo5 was premilled for 1 h, then added to C powder and milled for times ranging from 15 min to 7 h. X-ray diffraction indicates the presence of crystalline graphite and SmCo5 for milling times ≤ 6 h and also …

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Nanostructure And Magnetic Properties Of Composite Copt:C Films, M. Yu, Yi Liu, David J. Sellmyer May 2000

Nanostructure And Magnetic Properties Of Composite Copt:C Films, M. Yu, Yi Liu, David J. Sellmyer

David Sellmyer Publications

The nanostructure and magnetic properties of composite CoPt:C films at room temperature were investigated as a function of annealing temperature, carbon concentration, and film thickness. CoPt:C films with a variety of carbon concentrations were fabricated by cosputtering Co, Pt, and C onto water-cooled Si(100) substrates followed by annealing. X-ray diffraction and transmission electron microscopy analyses indicate that nanocrystallites of face-centered-tetragonal (fct) CoPt phase, which has a uniaxial magnetocrystalline anisotropy constant of about 5×107 erg/cm3, can be formed in carbon matrix when the annealing temperature is higher than 600 °C. The grain sizes of the fct CoPt crystallites …

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Magnetic And Structural Properties Of Smco7-XCuX Alloys, I.A. Al-Omari, Y. Yeshurun, Jian Zhou, David J. Sellmyer May 2000

Magnetic And Structural Properties Of Smco7-XCuX Alloys, I.A. Al-Omari, Y. Yeshurun, Jian Zhou, David J. Sellmyer

David Sellmyer Publications

We report the structural and magnetic properties of SmCo7-xCux, where x= 0, 0.1, 0.2, 0.3, 0.4, 0.5, and 0.7. X-ray diffraction shows that these alloys from the disordered hexagonal TbCu7-type structure. For large values of x (x≥0.8) the hexagonal TbCu7-type structure cannot be formed. X-ray diffraction on magnetically aligned samples show that these samples have uniaxial anisotropy. The lattice parameters (a and c) are dependent on the Cu concentration, and the unit cell volume is found to increase with x. The saturation magnetization decreases with x …

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Temperature Dependence Of Magnetic Hysteresis Of RcoX:Co Nanocomposites (R=Pr And Sm), J. Ping Liu, Ralph Skomski, Yi Liu, David J. Sellmyer May 2000

Temperature Dependence Of Magnetic Hysteresis Of RcoX:Co Nanocomposites (R=Pr And Sm), J. Ping Liu, Ralph Skomski, Yi Liu, David J. Sellmyer

David Sellmyer Publications

The temperature dependence of magnetic hysteresis of RCox:Co (R=Pr and Sm) nanocomposite films is reported. These films are prepared by dc and rf sputtering and subsequent thermal processing. It is found that the squareness of the hysteresis loops deteriorates with decreasing temperature. This is attributed to the enhanced magnetic anisotropy of the hard phases at low temperatures. The analysis of the magnetic reversal process shows that the anisotropy enhancement leads to a transition from cooperated to independent behavior. This analysis agrees well with the experimental results.

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Hysteresis-Loop Overskewing In The Light Of A Novel Nucleation Mode, Ralph Skomski, J. Ping Liu, David J. Sellmyer May 2000

Hysteresis-Loop Overskewing In The Light Of A Novel Nucleation Mode, Ralph Skomski, J. Ping Liu, David J. Sellmyer

David Sellmyer Publications

It is demonstrated that the magnetostatic demagnetizing factor is not the only sample-shape dependent contribution to the hysteresis loop. There are also exchange contributions, which lead to interesting effects, particularly in nanostructures. An example is the recently discovered bulging mode in two-phase nanomagnets. The bulging mode exhibits the angular symmetry of the coherent mode, but it is incoherent due to its radial variation and gives rise to negative demagnetizing factors.

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Structure And Magnetic Properties Of Smco7-XTiX With Tbcu7-Type Structure, Jian Zhou, I.A. Al-Omari, J. Ping Liu, David J. Sellmyer May 2000

Structure And Magnetic Properties Of Smco7-XTiX With Tbcu7-Type Structure, Jian Zhou, I.A. Al-Omari, J. Ping Liu, David J. Sellmyer

David Sellmyer Publications

The SmCo7-xTix, x = 0–0.56 bulk samples are prepared by arc melting. X-ray diffraction indicates that samples with 0.2<x7-type structure phase and other minor phases appear for other values of x, which indicates that Ti helps stabilize the 1-7 phase. The lattice parameters ratio (c/a) increases with increasing Ti concentration. Room temperature saturation magnetization and Curie temperature decrease with increasing x. X-ray diffraction and magnetization measurements on aligned samples show that all samples studied have uniaxial anisotropy. The anisotropy field is found to increase with increasing x reaching …

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Magnetic Properties Of Cluster-Beam-Synthesized Cobalt: Noble-Metal Films, J.M. Meldrim, Y. Qiang, Yi Liu, H. Haberland, David J. Sellmyer May 2000

Magnetic Properties Of Cluster-Beam-Synthesized Cobalt: Noble-Metal Films, J.M. Meldrim, Y. Qiang, Yi Liu, H. Haberland, David J. Sellmyer

David Sellmyer Publications

A cluster-beam deposition technique has been used to produce magnetic clusters embedded in a nonmagnetic matrix. We report here on films with cobalt clusters of average diameter of 5.5 nm embedded both in Cu and Ag. Volumetric concentrations of Co ranged from 10% to 50%. Magnetization and low temperature hysteresis loops, both field cooled (FC) and zero-field cooled (ZFC), have been measured between 4.2 and 300 K. The FC and ZFC magnetization bifurcate at or above room temperature with the clusters having a nonzero remanence at room temperature. Low temperature hysteresis loops exhibit a two-phase nature with one phase displaying …

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Magnetic Spectroscopy And Characterization Of La0.65Pb0.35Mno3, M. I. Chipara, Shireen Adenwalla, Peter A. Dowben, Qin Lan Xu, Sy_Hwang Liou, R. Shoemaker May 2000

Magnetic Spectroscopy And Characterization Of La0.65Pb0.35Mno3, M. I. Chipara, Shireen Adenwalla, Peter A. Dowben, Qin Lan Xu, Sy_Hwang Liou, R. Shoemaker

Peter Dowben Publications

Crystalline films of La0.65Pb0.35MnO3 grown on Si (100) substrates by rf sputtering have been investigated by ferromagnetic resonance and MOKE. The dependence of the ferromagnetic resonance line parameters on the sample orientation and temperature is investigated. An expression for the angular dependence of the resonance field on the orientation of the sample is proposed, based on the assumption that close to the Curie temperature the Zeeman and demagnetizing terms are dominant. MOKE data support this hypothesis. The temperature dependence of the magnetization at saturation, in relative units, estimated from ferromagnetic resonance agrees with SQUID data. …

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The Surface Terminal Layer And Composition Of The Colossal Magnetoresistance Perovskite: La0.65Pb0.35Mno3, C.N. Borca, Delia Ristoiu, Q.L. Xu, Sy_Hwang Liou, Shireen Adenwalla, Peter A. Dowben May 2000

The Surface Terminal Layer And Composition Of The Colossal Magnetoresistance Perovskite: La0.65Pb0.35Mno3, C.N. Borca, Delia Ristoiu, Q.L. Xu, Sy_Hwang Liou, Shireen Adenwalla, Peter A. Dowben

Peter Dowben Publications

The composition in the surface region of the colossal magnetoresistance perovskite manganite materials, La0.65Pb0.35MnO3 has been studied using angle resolved x-ray photoemission spectroscopy. The results are consistent with a Mn–O terminal layer and Pb segregation to the near-surface region. This is similar to the behavior exhibited by La0.65Pb0.35MnO3 and La0.65Pb0.35MnO3. The O–Mn–O terminal layer appears to be close to the Mn3+ valence state. ©2000 American Institute of Physics.

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Measurement Of The Differential Dijet Mass Cross Section In Pp̅ Collisions At √S =1.8 Tev, T. Affolder, Kenneth A. Bloom, Collider Detector At Fermilab Collaboration May 2000

Measurement Of The Differential Dijet Mass Cross Section In Pp̅ Collisions At √S =1.8 Tev, T. Affolder, Kenneth A. Bloom, Collider Detector At Fermilab Collaboration

Kenneth Bloom Publications

We present a measurement of the cross section for production of two or more jets as a function of dijet mass, based on an integrated luminosity of 86 pb-1 collected with the Collider Detector at Fermilab. Our dijet mass spectrum is described within errors by next-to-leading order QCD predictions using CTEQ4HJ parton distributions, and is in good agreement with a similar measurement from the DØ experiment.

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The Influence Of Both Coordination Number And Lattice Constant On The Nonmetal To Metal Transition, I.N. Yakovkin, Peter A. Dowben May 2000

The Influence Of Both Coordination Number And Lattice Constant On The Nonmetal To Metal Transition, I.N. Yakovkin, Peter A. Dowben

Peter Dowben Publications

We show that both coordination and lattice constant can have an important influence on the nonmetal to metal transition and the two parameters are not easily separated. Using example theoretical calculations for barium, we provide a compelling case that atomic coordination is a critical factor in determining the critical lattice constant for the nonmetal to metal transition. A comparison between the nonmetal to metal transition three-dimensional and two-dimensional systems is not possible on the basis of the atomic coordination alone. This is discussed in the context of a comparison of the available experimental data for both elemental expanded fluids (three-dimensional) …

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Selective Area Chemical Vapor Deposition Of Chromium Oxides, Ruihua Cheng, C.N. Borca, Peter A. Dowben May 2000

Selective Area Chemical Vapor Deposition Of Chromium Oxides, Ruihua Cheng, C.N. Borca, Peter A. Dowben

Peter Dowben Publications

We demonstrate that two-phase CrO2 and Cr2O3 thin films can be grown by using selective organometallic chemical vapor deposition through the oxidation of Cr(CO) 6 in an oxygen environment. While the magnetization measurements show that both chromium oxides are present, the relative weight of each phase depends on the oxygen partial pressure. Changes of the Curie temperature, Tc, and the saturation magnetization field may be possible by controlling the stoichiometry.

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Esr Investigations On Ca Perovskite, M. Chipara, Sy-Hwang Liou, C.N. Borca, R. Shoemaker, Shireen Adenwalla, Peter A. Dowben May 2000

Esr Investigations On Ca Perovskite, M. Chipara, Sy-Hwang Liou, C.N. Borca, R. Shoemaker, Shireen Adenwalla, Peter A. Dowben

Peter Dowben Publications

Electron spin resonance studies on fine powders of La0.65Ca0.35MnO3, performed in the X band, are reported. The coexistence of paramagnetic and ferromagnetic phases, in a narrow temperature range close to the Curie temperature, is observed. The electron spin resonance measurements do not support the presence of bipolarons above the Curie temperature. Temperature dependence of the ESR linewidth is governed by the hopping of polarons and the corresponding activation energy is about 150 meV above Tc.

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Comparative Thermal-Expansion Study Of Β″-(Et)2sf5ch2cf2so3 And Κ-(Et)2cu(Ncs)2: Uniaxial Pressure Coefficients Of Tc And Upper Critical Fields, J. Müller, M. Lang, F. Steglich, J. A. Schlueter, A. M. Kini, U. Geiser, Javid Mohtasham, Rolf Walter Winter, Gary L. Gard, T. Sasaki, N. Toyota May 2000

Comparative Thermal-Expansion Study Of Β″-(Et)2sf5ch2cf2so3 And Κ-(Et)2cu(Ncs)2: Uniaxial Pressure Coefficients Of Tc And Upper Critical Fields, J. Müller, M. Lang, F. Steglich, J. A. Schlueter, A. M. Kini, U. Geiser, Javid Mohtasham, Rolf Walter Winter, Gary L. Gard, T. Sasaki, N. Toyota

Chemistry Faculty Publications and Presentations

We report high-resolution measurements of the coefficient of thermal expansion, α=l⁻¹ x (δl/δΤ), on single crystals of the organic superconductors β″-(ET)₂SF₅CH₂CF₂SO₃ and κ-(ET)₂Cu(NCS)₂. For both salts we find large and highly anisotropic phase-transition anomalies at Tc. Combining these data with literature results on the specific heat via the Ehrenfest relation, the uniaxial pressure coefficients of Tc can be determined. Most remarkably, a strikingly similar in-plane vs out-of-plane anisotropy is found for both compounds: the strong suppression of Tc observed in hydrostatic-pressure experiments is dominated by a huge negative uniaxial stress effect perpendicular to the conducting planes. Therefore we expect that …

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Wetland Mitigation Banking As A Tool For Conservation, Reid Beauregard Sisson May 2000

Wetland Mitigation Banking As A Tool For Conservation, Reid Beauregard Sisson

Masters Theses and Doctoral Dissertations

This comment proposes that wetland mitigation banking under Section 404 of the Clean Water Act be employed by land trusts and conservation groups to generate revenue for funding land acquisitions and on-going stewardship for both wetland and wetland-related upland habitats threatened or impacted by development. Conservation groups and land trusts can use mitigation banking to generate revenue to fund their conservation goals. General background on the Clean Water Act - Section 404 and regulations affecting wetlands, compensatory mitigation and mitigation banking is provided. Included are general problems with monitoring and enforcement of mitigation, pros and cons of preservation as compensatory …

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The Design Process, Thomas Pasquini May 2000

The Design Process, Thomas Pasquini

Theses

This thesis investigates similar problem-solving processes used in the fields of graphic design and engineering, revealing an underlying relationship between the two disciplines. It shows the principles these two disciplines share and how they employ a common creative process. By comparing these two vastly different disciplines, an understanding of the methodology of thought is constructed.

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Monitoring Precursor 16s Rrnas Of Acinetobacter Spp. In Activated Sludge Wastewater Treatment Systems, Daniel B. Oerther, Jakob Pernthaler, Andreas Schramm, Rudolf Amann, Lutgarde M. Raskin May 2000

Monitoring Precursor 16s Rrnas Of Acinetobacter Spp. In Activated Sludge Wastewater Treatment Systems, Daniel B. Oerther, Jakob Pernthaler, Andreas Schramm, Rudolf Amann, Lutgarde M. Raskin

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Recently, Cangelosi and Brabant used oligonucleotide probes targeting the precursor 16S rRNA of Escherichia coli to demonstrate that the levels of precursor rRNA were more sensitive to changes in growth phase than the levels of total rRNA (G. A. Cangelosi and W. H. Brabant, J. Bacteriol. 179:4457- 4463, 1997). In order to measure changes in the levels of precursor rRNA in activated sludge systems, we designed oligonucleotide probes targeting the 3' region of the precursor 16S rRNA of Acinetobacter spp. We used these probes to monitor changes in the level of precursor 16S rRNA during batch growth of Acinetobacter spp. …

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Hydrogeologic Analysis Of Streamflow In Relation To Underground Mining In Northern West Virginia, David Robert Gill May 2000

Hydrogeologic Analysis Of Streamflow In Relation To Underground Mining In Northern West Virginia, David Robert Gill

Graduate Theses, Dissertations, and Problem Reports (ETD)

Land subsidence, caused by longwall mining, has a negative effect on overlying watersheds. Nine streams were monitored from their headwaters to their mouths for discharge, temperature, conductivity, alluvium thickness, and alluvium sediment size. Seven streams are located over undermined longwall panels, with two located over non-undermined areas. Discharge data shows that non-undermined watersheds do not experience stream dewatering, regardless of alluvium thickness or sediment size. Streams located over active or recently mined longwall panels experience water loss that ranges from slight to total. Impacted streams with overall increases in conductivity and decreases in water temperature suggest that lost streamflow travels …

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Predicting Permeability And Flow Capacity Distribution With Back-Propagation Artificial Neural Networks, Alexis Jose Riera May 2000

Predicting Permeability And Flow Capacity Distribution With Back-Propagation Artificial Neural Networks, Alexis Jose Riera

Graduate Theses, Dissertations, and Problem Reports (ETD)

The prediction of permeability is a critical, key step for reservoir modeling and management of oil recovery operations. Previous studies have successfully demonstrated that the new technology called Artificial Neural Network (ANN), a biologically inspired, massive parallel, distributed information processing system, is an excellent tool for permeability predictions using well log data. This technology overcomes the drawbacks caused by the inherent heterogeneity of the reservoir and lack of sufficient cores or pressure transient tests, allowing to define reservoir characterization within an acceptable accuracy while maintaining costs low. The methodology used in this study takes advantage of this technology to accomplish …

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Composition Effects On Macroscopic Solidification Segregation Of Superalloys, Wei Chen May 2000

Composition Effects On Macroscopic Solidification Segregation Of Superalloys, Wei Chen

Graduate Theses, Dissertations, and Problem Reports (ETD)

This research work investigates primarily the composition effects on solidification macrosegregation, i.e. freckles, in superalloys. First, the freckling mechanism of superalloys is developed using the physical simulation of freckle formation in specially designed model alloys. It is found that freckles originate from dendrite irregularities at the solidification front. The freckle channels flow downward in Nb-containing alloys and upward in T-containing alloy under horizontal solidification conditions. The horizontal solidification correctly simulates the horizontal component in remelt ingot where freckling potential is the highest. Based on the result, key control parameters for freckling are identified.;Thermodynamic simulation approach is employed to study the …

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Inventory And Prediction Of Heavy-Duty Diesel Vehicle Emissions, Justin Michael Kern May 2000

Inventory And Prediction Of Heavy-Duty Diesel Vehicle Emissions, Justin Michael Kern

Graduate Theses, Dissertations, and Problem Reports (ETD)

A vehicle emissions inventory is an account of emissions produced by all vehicles in an area. Many different factors can affect the emissions and the measurement of the emissions that are used to create an emissions inventory. These factors for heavy-duty diesel vehicles have been addressed and their relative affect on emissions was evaluated from test data and analytical analyses. These elements can affect the emissions by a factor of 15 depending on testing conditions.;One purpose that an emissions database serves is to provide a source for predicting future emissions for a specific vehicle or many vehicles in a general …

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Effect Of Debris-Induced Lift-Off On Magnetic Flux Leakage Inspection Results, Francisco Louis Valentine May 2000

Effect Of Debris-Induced Lift-Off On Magnetic Flux Leakage Inspection Results, Francisco Louis Valentine

Graduate Theses, Dissertations, and Problem Reports (ETD)

Debris is present in all pipelines and has the potential to cause debris-induced lift-off in magnetic flux leakage inspection tools. A test apparatus was developed to qualitatively examine the effect of debris-induced lift-off.;The results of this research indicate that debris-induced lift-off has a detrimental effect on magnetic flux leakage data. This increases the potential of pipeline defects being either undersized or missed.;To reduce or eliminate the effects of debris-induced lift-off, the pipeline should be regularly cleaned. This minimizes the occurrence of large accumulations of debris. If it is determined that debris is present in a pipeline, even in small quantities, …

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Smart Card-Enabled Security Services To Support Secure Telemedicine Applications, Monoreet Mutsuddi May 2000

Smart Card-Enabled Security Services To Support Secure Telemedicine Applications, Monoreet Mutsuddi

Graduate Theses, Dissertations, and Problem Reports (ETD)

The Internet is quickly evolving into a standard and widely used mode of information transfer. Therefore internet's information transfer capabilities could be exploited by Secure Telemedicine Applications to securely transfer medical information. However the current day internet protocol stack does not provide much in terms of security for the data being transferred across it. In this thesis we explore how Cryptography along with Smart Cards can be used to implement application layer protocols, to enhance the security of data flowing across the internet in a Secure Telemedicine environment. This thesis also discusses the design and implementation of various system software …

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Load Sharing In Distributed Multimedia-On-Demand Systems, Y. C. Tay, Hwee Hwa Pang May 2000

Load Sharing In Distributed Multimedia-On-Demand Systems, Y. C. Tay, Hwee Hwa Pang

Research Collection School Of Computing and Information Systems

Service providers have begun to offer multimedia-on-demand services to residential estates by installing isolated, small-scale multimedia servers at individual estates. Such an arrangement allows the service providers to operate without relying on a highspeed, large-capacity metropolitan area network, which is still not available in many countries. Unfortunately, installing isolated servers can incur very high server costs, as each server requires spare bandwidth to cope with fluctuations in user demand. The authors explore the feasibility of linking up several small multimedia servers to a (limited-capacity) network, and allowing servers with idle retrieval bandwidth to help out servers that are temporarily overloaded; …

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An Experimental Comparison Of Parallel Algorithms For Ear Decomposition Of Graphs Using Two Leading Paradigms, D.A. Bader, A.K. Illendula May 2000

An Experimental Comparison Of Parallel Algorithms For Ear Decomposition Of Graphs Using Two Leading Paradigms, D.A. Bader, A.K. Illendula

Electrical & Computer Engineering Technical Reports

Graph decomposition is an important and necessary operation when solving graph-theoretic problems on parallel computers, for instance, from computational fluid dynamics, mechanics, and astrophysics. In this paper, we design and analyze message-passing and shared-memory parallel algorithms that efficiently decompose a planar graph into a number of ears, known as the Ear Decomposition. This decomposition provides a general framework for solving graph problems efficiently in parallel. Our study includes both theoretical analysis and confirmation of the complexity cost using two leading parallel programming paradigms, namely, message-passing (MPI) and shared-memory (SMP) implementations. A catalog of both regular and irregular input graphs are …

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Decision Support Methods In Diabetic Patient Management By Insulin Administration Neural Network Vs. Induction Methods For Knowledge Classification, B. V. Ambrosiadou, S. Vadera, Venky Shankaraman, D. Goulis, G. Gogou May 2000

Decision Support Methods In Diabetic Patient Management By Insulin Administration Neural Network Vs. Induction Methods For Knowledge Classification, B. V. Ambrosiadou, S. Vadera, Venky Shankaraman, D. Goulis, G. Gogou

Research Collection School Of Computing and Information Systems

Diabetes mellitus is now recognised as a major worldwide public health problem. At present, about 100 million people are registered as diabetic patients. Many clinical, social and economic problems occur as a consequence of insulin-dependent diabetes. Treatment attempts to prevent or delay complications by applying ‘optimal’ glycaemic control. Therefore, there is a continuous need for effective monitoring of the patient. Given the popularity of decision tree learning algorithms as well as neural networks for knowledge classification which is further used for decision support, this paper examines their relative merits by applying one algorithm from each family on a medical problem; …

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Predictive Adaptive Resonance Theory And Knowledge Discovery In Databases, Ah-Hwee Tan, Hui-Shin Vivien Soon May 2000

Predictive Adaptive Resonance Theory And Knowledge Discovery In Databases, Ah-Hwee Tan, Hui-Shin Vivien Soon

Research Collection School Of Computing and Information Systems

This paper investigates the scalability of predictive Adaptive Resonance Theory (ART) networks for knowledge discovery in very large databases. Although predictive ART performs fast and incremental learning, the number of recognition categories or rules that it creates during learning may become substantially large and cause the learning speed to slow down. To tackle this problem, we introduce an on-line algorithm for evaluating and pruning categories during learning. Benchmark experiments on a large scale data set show that on-line pruning has been effective in reducing the number of the recognition categories and the time for convergence. Interestingly, the pruned networks also …

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