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2002

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Articles 2341 - 2370 of 3435

Full-Text Articles in Physical Sciences and Mathematics

Method Of Color Interpolation In A Single Sensor Color Camera Using Green Channel Separation, Chaminda Weerasinghe, Igor Kharitonenko, Philip Ogunbona Jan 2002

Method Of Color Interpolation In A Single Sensor Color Camera Using Green Channel Separation, Chaminda Weerasinghe, Igor Kharitonenko, Philip Ogunbona

Faculty of Informatics - Papers (Archive)

This paper presents a color interpolation algorithm for a single sensor color camera. The proposed algorithm is especially designed to solve the problem of pixel crosstalk among the pixels of different color channels. Interchannel cross-talk gives rise to blocking effects on the interpolated green plane, and also spreading of false colors into detailed structures. The proposed algorithm separates the green channel into two planes, one highly correlated with the red channel and the other with the blue channel. These separate planes are used for red and blue channel interpolation. Experiments conducted on McBeth color chart and natural images have shown …

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Digital Watermarks For Copyright Protection, Nicholas Paul Sheppard, Reihaneh Safavi-Naini, Philip Ogunbona Jan 2002

Digital Watermarks For Copyright Protection, Nicholas Paul Sheppard, Reihaneh Safavi-Naini, Philip Ogunbona

Faculty of Informatics - Papers (Archive)

It is feared that the ease with which digital media can be copied will lead to a proliferation of copyright infringement. One proposed technical solution is digital watermarking, which embeds a hidden signal into host data that can be used in a variety of protocols that attempt to either prevent or deter copyright infringement. In this paper, we give a brief overview of digital watermarking and discuss some of the issues involved in providing effective digital watermarking systems for deterring copyright infringement.

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Evaluating The Optimal Probability Distribution For Steganography Under Zero-Error Conditions, Gareth Brisbane, Reihaneh Safavi-Naini, Philip Ogunbona Jan 2002

Evaluating The Optimal Probability Distribution For Steganography Under Zero-Error Conditions, Gareth Brisbane, Reihaneh Safavi-Naini, Philip Ogunbona

Faculty of Informatics - Papers (Archive)

Information hiding can be performed under the guise of a digital image. We consider the following scenario: Alice and Bob share an image and would like to use it as a cover image to communicate a message m. We are interested in answering two questions: What is the maximum amount of information that can be sent for a given level of degradation to an image? and How can this level of efficiency be achieved in practice? We require the recovered message to be the same as the embedded one. Our model begins with Alice compressing a message to obtain a …

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A Hybrid Approach To The Core Curriculum, I. Piper, P. Castle, A. Fuller, G. Awyzio Jan 2002

A Hybrid Approach To The Core Curriculum, I. Piper, P. Castle, A. Fuller, G. Awyzio

Faculty of Informatics - Papers (Archive)

In this paper we review the IEEE/ACM CC2001 model. We then describe our proposed core CS curriculum comprising four strands: programming languages, algorithms, discrete mathematics and systems. These sequences are to be taught over the first two years of the Bachelor of Computer Science Degree and need to be taken in parallel.

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An Architecture For Carrier Grade Programmable Networks, T. V. Nguyen, P. Boustead, Farzad Safaei Jan 2002

An Architecture For Carrier Grade Programmable Networks, T. V. Nguyen, P. Boustead, Farzad Safaei

Faculty of Informatics - Papers (Archive)

Active and programmable networks allow innovative new services to be deployed rapidly. However, in a carrier grade network, it is imperative to maintain a scalable fast path mechanism so that the delay and throughput requirements are met. This is particularly important since, in many cases, network-level processing is only needed for a subset of packets and the remainder of traffic must be forwarded on the fast path. It is a challenge to design a cost effective node architecture that can satisfy this requirement. Current models are often 'revolutionary' and may not scale to the required performance levels of a carrier …

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Generalised Minimum Variance Control Of Linear Time-Varying Systems, Zheng Li, R. J. Evans Jan 2002

Generalised Minimum Variance Control Of Linear Time-Varying Systems, Zheng Li, R. J. Evans

Faculty of Informatics - Papers (Archive)

The problem of generalised minimum variance control of linear time-varying discrete-time systems is studied. Standard time-varying controlled autoregressive moving average models are considered, and the sum of plant output tracking error variance plus a penalty term on plant input is chosen as the cost functional. The time-varying controller described is able to minimise the generalised tracking error variance and guarantees closed-loop exponential stability for a large class of linear time-varying systems, including plants which have long time delays and are not stably invertible.

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The Analysis Of Zheng-Seberry Scheme, D. Soldera, Jennifer Seberry, C. Qu Jan 2002

The Analysis Of Zheng-Seberry Scheme, D. Soldera, Jennifer Seberry, C. Qu

Faculty of Informatics - Papers (Archive)

The Zheng-Seberry (ZS) encryption scheme was published in 1993 and was one of the first practical schemes that was considered secure against a chosen ciphertext adversary. This paper shows some problems that the semantic security of the one-way hash variant of the ZS scheme is insecure on some special circumstances. Attempts to modify the ZS scheme resulted on an El-Gamal variant that is provably secure in the random oracle model.

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Short Amicable Sets, S. Georgiou, C. Koukouvinos, Jennifer Seberry Jan 2002

Short Amicable Sets, S. Georgiou, C. Koukouvinos, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

Abstract: A pair of matrices X and Y are said to be amicable if XYT = YXT. In this paper, if X and Y are orthogonal designs, group generated or circulant on the group G, these will be denoted 2—SAS(n; ul, u2; G). Recently Kharaghani, in "Arrays for orthogonal designs", J. Combin. Designs, 8 (2000), 166-173, extended this concept to an amicable set, {Ai}2n, i=1, of 2n circulant matrices, which satisfy ∑(Aσ(2i-1)AT σ(2i-1) - Aσ(2i) AT (2i-1) = 0. In this paper we concentrate on constructing short amicable sets, which satisfy the same equation but contain four, called short, or …

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The Invariance Principle For Linear Processes With Applications, Q. Wang, Y. X. Lin, C. M. Gulati Jan 2002

The Invariance Principle For Linear Processes With Applications, Q. Wang, Y. X. Lin, C. M. Gulati

Faculty of Informatics - Papers (Archive)

Let Xt be a linear process defined by [refer paper], where [refer paper] is greater than or equal to 0 is a sequence of real numbers and (ek, k = 0, plus or minus 1, plus or minus 2, ...) is a sequence of random variables. Two basic results, on the invariance principle of the partial sum process of the Xt converging to a standard Wiener process on [0,1], are presented in this paper. In the first result, we assume that the innovations ek are independent and identically distributed random variables but do not restrict [refer paper]. We note that, …

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The Effect Of Using Household As A Sampling Unit, Robert Graham Clark, David G. Steel Jan 2002

The Effect Of Using Household As A Sampling Unit, Robert Graham Clark, David G. Steel

Faculty of Informatics - Papers (Archive)

The effect of sampling people through households is considered. Results on design effects for two stage surveys are reviewed and applied to give design effects of household samples. The main factors that determine the design effect are identified for the designs in which one person, or all people, are selected from each selected household.Within household correlation is one factor.We show that the relationships between household size and the mean and variance within households are also important factors. Census and survey data are used to empirically compare the design effects for a range of estimators, variables and designs.

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Keeping E-Business In Perspective, Tim Coltman, T. M. Devinney, A. S. Latukefu, D. F. Midgley Jan 2002

Keeping E-Business In Perspective, Tim Coltman, T. M. Devinney, A. S. Latukefu, D. F. Midgley

Faculty of Informatics - Papers (Archive)

The article reveals that not all business fit the model of electronic business (e-business). Since the bubble burst in April 2000, many have become pessimistic about the future of e-business. Having been through process reengineering, enterprise resource planning, and now e-business with disappointing results, experienced managers are wary of large IT investments. Multiple failures in B2C, B2B, and other forms of e-business have raised questions regarding the pace at which the networked economy is emerging and ultimately the suitability of e-business for many firms. Claims that e-business is driving revolutionary business change are misleading and only partly correct. The most …

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Synthesis Of Chiral Allylic Amines Via Palladium(0) Catalysed Allylations Of Allylic Carbonates With Chiral Sulfinamide Anions, Zemin Dong, Stephen G. Pyne Jan 2002

Synthesis Of Chiral Allylic Amines Via Palladium(0) Catalysed Allylations Of Allylic Carbonates With Chiral Sulfinamide Anions, Zemin Dong, Stephen G. Pyne

Faculty of Science - Papers (Archive)

The palladium(0) catalysed allylation reactions of allylic carbonates with chiral sulfinamide anions to give unstable allylic sulfinamide products are described. These products are readily converted to stable, chiral N-benzoyl or N-tosyl allylic amine derivatives with poor to modest enantiomeric purities (ee 23-41%).

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Executive Information Systems Use In Organisational Contexts: Understanding The User Behaviour, George Ditsa Jan 2002

Executive Information Systems Use In Organisational Contexts: Understanding The User Behaviour, George Ditsa

Faculty of Informatics - Papers (Archive)

Executive Information Systems (EIS) are designed to enhance the managerial roles of top-level managers in organizations. Despite reports of the growing popularity of EIS, there are reports of low usage of these systems that, in part, contributes to their failures in organizations. Majority ofprior EIS research has focused on documenting the features, benefits, development methodologies, and implementation of the systems. Regrettably, there are very few studies addressing the problem of low EIS usage. This paper reports on a research in progress on the use ofEIS in organizational settings. The primary focus ofthe research is to investigate factors that explain users' …

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Electronic Commerce And Market Focus: Some Findings From A Study Of Swedish Small To Medium Enterprises, Lejla Vrazalic, Robert Macgregor, Deborah Bunker, Sten Carlsson, Monika Magnusson Jan 2002

Electronic Commerce And Market Focus: Some Findings From A Study Of Swedish Small To Medium Enterprises, Lejla Vrazalic, Robert Macgregor, Deborah Bunker, Sten Carlsson, Monika Magnusson

Faculty of Informatics - Papers (Archive)

In the past, organisations relied on traditional quantitative metrics, such as return on investment (ROI) to make decisions when investing in technology. With the advent of electronic commerce (EC), these decisions are becoming less reliant on ROI measures. Instead different driving forces are taking precedence in the decision making process. This paper presents the findings of a study of 118 Swedish small to medium enterprises (SMEs) that have adopted EC. The results of the study suggest that improvements to customer service, internal efficiency and organisational competitiveness have become equally important when making EC investment decisions. The study also examined whether …

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Kinematic Analysis Of Spatial Fixed-Axis Higher Pairs Using Configuration Spaces, Ku-Jin Kim, Elisha P. Sacks, Leo Joskowicz Jan 2002

Kinematic Analysis Of Spatial Fixed-Axis Higher Pairs Using Configuration Spaces, Ku-Jin Kim, Elisha P. Sacks, Leo Joskowicz

Department of Computer Science Technical Reports

No abstract provided.

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In-Memory Evaluation Of Continuous Range Queries On Moving Objects, Dmitri V. Kalashnikov, Sunil Prabhakar Jan 2002

In-Memory Evaluation Of Continuous Range Queries On Moving Objects, Dmitri V. Kalashnikov, Sunil Prabhakar

Department of Computer Science Technical Reports

No abstract provided.

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Redesign Of A Spatial Gear Pair Using Configuration Spaces, Elisha Sacks, Leo Joskowicz, Ralf Schulthesis, Uwe Hinze Jan 2002

Redesign Of A Spatial Gear Pair Using Configuration Spaces, Elisha Sacks, Leo Joskowicz, Ralf Schulthesis, Uwe Hinze

Department of Computer Science Technical Reports

No abstract provided.

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Market Analysis: Survey Results Exclusive Of The Responses Of The Coastal Training Partners, Kevin O'Brien Jan 2002

Market Analysis: Survey Results Exclusive Of The Responses Of The Coastal Training Partners, Kevin O'Brien

All Maxine Goodman Levin School of Urban Affairs Publications

The Great Lakes Environmental Finance Center (GLEFC) is conducting a market analysis to assist the Ohio Department of Natural Resources (ODNR), Old Woman Creek National Estuarine Research Reserve, and the Ohio Sea Grant College Program in developing a comprehensive training program on coastal resources management for coastal decision-makers. This report is an addendum to the third of four reports to be produced by the Great Lakes Environmental Finance Center (GLEFC) in conjunction with the Coastal Training Market Analysis.

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Random Probability Measures With Given Mean And Variance Running Title: Random Probability Measures, Lisa Bloomer, Theodore P. Hill Jan 2002

Random Probability Measures With Given Mean And Variance Running Title: Random Probability Measures, Lisa Bloomer, Theodore P. Hill

Research Scholars in Residence

This article describes several natural methods of constructing random probability measures with prescribed mean and variance, and focuses mainly on a technique which constructs a sequence of simple (purely discrete, finite number of atoms) distributions with the prescribed mean and with variances which increase to the desired variance. Basic properties of the construction are established, including conditions guaranteeing full support of the generated measures, and conditions guaranteeing that the final measure is discrete. Finally, applications of the construction method to optimization problems such as Plackett’s Problem are mentioned, and to experimental determination of average-optimal solutions of certain control problems.

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High Spatial Resolution Thermal Conductivity Of Bulk Zno (0001), Diana I. Florescu, L. G. Mourokh, Fred H. Pollak, David C. Look, G. Cantwell, X. Li Jan 2002

High Spatial Resolution Thermal Conductivity Of Bulk Zno (0001), Diana I. Florescu, L. G. Mourokh, Fred H. Pollak, David C. Look, G. Cantwell, X. Li

Physics Faculty Publications

We measured high spatial/depth resolution 300 K thermal conductivity κ of the Zn and O surfaces of two bulk n-type ZnO (0001) samples, grown by a vapor-phase transport method, using scanning thermal microscopy (SThM). The thermal investigation was performed in both point-by-point (∼2 μm resolution) and area-scan modes. On the first sample κ=1.16±0.08 (Zn face)/1.10±0.09 (O face) W/cm K while for the second material κ=1.02±0.07 (Zn face)/0.98±0.08 (O face) W/cm K. These are the highest κ values reported on ZnO. A correlation between SThM area-scan readings and surface topography was established by simultaneously performing atomic force microscopy scans. The …

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Coherent Integration Of 0.5 Ghz Spectral Holograms At 1536 Nm Using Dynamic Biphase Codes, Z Cole, Thomas Böttger, R Krishna Mohan, R Reibel, W R. Babbitt, R L. Cone, K D. Merkel Jan 2002

Coherent Integration Of 0.5 Ghz Spectral Holograms At 1536 Nm Using Dynamic Biphase Codes, Z Cole, Thomas Böttger, R Krishna Mohan, R Reibel, W R. Babbitt, R L. Cone, K D. Merkel

Physics and Astronomy

Spectral hole-burning-based optical processing devices are proposed for coherent integration of multiple high-bandwidth interference patterns in a spectral hole-burning medium. In this implementation, 0.5 GHz spectral holographic gratings are dynamically accumulated in Er3+:Y2SiO5" style="position: relative;" tabindex="0" id="MathJax-Element-1-Frame">Er3+:Y2SiO5 at 4.2 K using a 1536 nm laser frequency stabilized to a spectral hole, along with commercial off-the-shelf components. The processed data, representing time delays over 0.5–2.0 μs, were optically read out using a frequency-swept probe; this approach makes possible the use of low-bandwidth, large-dynamic-range detectors and digitizers and enables competitive processing for applications such as radar,lidar, and radio astronomy. Coherent integration …

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Mutual Constraints Between Reionization Models And Parameter Extraction From Cosmic Microwave Background Data, Aparna Venkatesan Jan 2002

Mutual Constraints Between Reionization Models And Parameter Extraction From Cosmic Microwave Background Data, Aparna Venkatesan

Physics and Astronomy

Spectroscopic studies of high-redshift objects and increasingly precise data on the cosmic microwave background (CMB) are beginning to independently place strong complementary bounds on the epoch of hydrogen reionization. Parameter estimation from current CMB data continues, however, to be subject to several degeneracies. Here, we focus on those degeneracies in CMB parameter forecasts related to the optical depth to reionization. We extend earlier work on the mutual constraints that such analyses of CMB data and a reionization model may place on each other to a more general parameter set and to the case of data anticipated from the MAP satellite. …

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Modeling An Electrosensory Landscape: Behavioral And Morphological Optimization In Elasmobranch Prey Capture, Brandon R. Brown Jan 2002

Modeling An Electrosensory Landscape: Behavioral And Morphological Optimization In Elasmobranch Prey Capture, Brandon R. Brown

Physics and Astronomy

Most biological sensory systems benefit from multiple sensors. Elasmobranchs (sharks, skates and rays) possess an array of electroreceptive organs that facilitate prey location, mate location and navigation. Here, the perceived electrosensory landscape for an elasmobranch approaching prey is mathematically modeled. The voltages that develop simultaneously in dozens of separate sensing organs are calculated using electrodynamics. These voltages lead directly to firing rate modifications in the primary afferent nerves. The canals connecting the sense organs to an elasmobranch's surface exhibit great variation of location and orientation. Here, the voltages arising in the sense organs are found to depend strongly on the …

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The Planet, 2002, Winter, Levi Pulkkinen, Huxley College Of The Environment, Western Washington University Jan 2002

The Planet, 2002, Winter, Levi Pulkkinen, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

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Huxley Horizon, 2002, Winter, Volume 02, Issue 01, Huxley College Of The Environment, Western Washington University Jan 2002

Huxley Horizon, 2002, Winter, Volume 02, Issue 01, Huxley College Of The Environment, Western Washington University

Historical Collection of Huxley Newsletters

No abstract provided.

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Group Properties Of Crossover And Mutation, Jonathan E. Rowe, Michael D. Vose, Alden H. Wright Jan 2002

Group Properties Of Crossover And Mutation, Jonathan E. Rowe, Michael D. Vose, Alden H. Wright

Computer Science Faculty Publications

It is supposed that the finite search space Ω has certain symmetries that can be described in terms of a group of permutations acting upon it. If crossover and mutation respect these symmetries, then these operators can be described in terms of a mixing matrix and a group of permutation matrices. Conditions under which certain subsets of Ω are invariant under crossover are investigated, leading to a generalization of the term schema. Finally, it is sometimes possible for the group acting on Ω to induce a group structure on Ω itself.

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Basal Conditions And Glacier Motion During The Winter/Spring Transition, Worthington Glacier, Alaska, U.S.A., Joel T. Harper, Neil Humphrey, Mark C. Greenwood Jan 2002

Basal Conditions And Glacier Motion During The Winter/Spring Transition, Worthington Glacier, Alaska, U.S.A., Joel T. Harper, Neil Humphrey, Mark C. Greenwood

Geosciences Faculty Publications

Observations of the motion and basal conditions of Worthington Glacier, Alaska, U.S.A., during late-winter and spring melt seasons revealed no evidence of a relationship between water pressure and sliding velocity. Measurements included borehole water levels (used as a proxy for basal water pressure), surface velocity, englacial deformation, sliding velocity, and time-lapse videography of subglacial water flow and bed characteristics. The boreholes were spaced 10-15 m apart; six were instrumented in 1997, and five in 1998. In late winter, the water-pressure field showed spatially synchronous fluctuations with a diurnal cycle. The glacier's motion was relatively slow and non-cyclic. In spring, the …

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Jecp/Ed Manual, Xingzhong Li Jan 2002

Jecp/Ed Manual, Xingzhong Li

Nebraska Center for Materials and Nanoscience: Faculty Publications

JECP/ED is a Java program with graphic interface for simulating electron diffraction pattern. It is designed and written by Dr. Xingzhong in University of Nebraska- Lincoln. This is verision 12-2002. It can be used for simulating electron diffraction zone pattern(ZOLZ with/without FOLZ), it allows to select zone axis, high voltage, sample thickness in the simulation, optional to show index, intensity and Laue center, featureed with manuniplating the pattern with slightly tilting, 360 degree rotation, zoom. The diffraction intensity is calculated on the basis of the kinematical theory. The program is extended to simulate electron diffraction with a precession of incident …

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2002 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group Jan 2002

2002 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group

Images

The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 2002.

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Historical And Current Observations On Macroalgae In The Hillsborough Bay Estuary, J.O.R. Johansson Jan 2002

Historical And Current Observations On Macroalgae In The Hillsborough Bay Estuary, J.O.R. Johansson

Reports

To improve the understanding of macroalgae dynamics it was recommended that long-term monitoring of the macroalgae in the bay be initiated. Subsequently, the City of Tampa initiated a Hillsborough Bay macroalgae monitoring program that since 1986 has been providing consistent monthly biomass and species composition information from five fixed transects. In addition to the transect monitoring, low level aerial observations are conducted on a near monthly schedule for estimations of bay-wide macroalgae and seagrass coverage. Results indicate that the annual bay-wide macroalgae coverage has decreased near steadily from about 300ha in the late 1980's to less than 30ha since 1997.

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