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Articles 3931 - 3960 of 5573
Full-Text Articles in Physical Sciences and Mathematics
Background Radio Frequency Interference Measurements For Wireless Devices In The Electricity Supply Industry, D A. Robinson, Tadeusz A. Wysocki, Victor W. Smith, Keni Popovski
Background Radio Frequency Interference Measurements For Wireless Devices In The Electricity Supply Industry, D A. Robinson, Tadeusz A. Wysocki, Victor W. Smith, Keni Popovski
Faculty of Informatics - Papers (Archive)
Incorporation of radio controller units into heavy equipment used in the electricity industry provides numerous advantages including: improved electrical isolation between plant and operator, ability to incorporate an additional remote operator, and reductions in vehicle wiring and hydraulic hoses for equipment control. However, secure operation of vehicles and plant incorporating radio control rely on establishing suitable levels of immunity to possible radio frequency interference. Interference levels in close proximity to high voltage power lines are of special concern to the electricity industry. This paper reports on a preliminary investigation into quantifying the levels of background radio interference at such locations …
A Secure Multicast Architecture And Protocol For Mospf, Junqi Zhang, Yi Mu, Vijay Varadharajan
A Secure Multicast Architecture And Protocol For Mospf, Junqi Zhang, Yi Mu, Vijay Varadharajan
Faculty of Informatics - Papers (Archive)
Multicast Open Shortest Path First (MOSPF) is an en hancement to unicast routing protocol OSPF. It has been widely used in many multicast applications for years. How ever, its security is still a major concern in some applica tions. Much work has been done on data protection, but only a few works have been done on member access con trol mechanisms. In this paper, we present a new secure multicast architecture and protocol for MOSPF from the perspective of member access control. Our new model in cludes a variant of previous access control mechanism and a novel distributed encryption scheme. …
Vlsi Implementation Of A Skin Detector Based On A Neural Network, Farid Boussaid, Abdesselam Bouzerdoum, Douglas Chai
Vlsi Implementation Of A Skin Detector Based On A Neural Network, Farid Boussaid, Abdesselam Bouzerdoum, Douglas Chai
Faculty of Informatics - Papers (Archive)
This paper describes the VLSI implementation of a skin detector based on a neural network. The proposed skin detector uses a multilayer perception with three inputs, one hidden layer, one output neuron and a saturating linear activation function to simplify the hardware implementation. The skin detector achieves a classification accuracy of 88.76%. To reduce mismatch associated errors, a single skin detection processing unit is used to classify all pixels of the input RGB image. The current-mode fully analog skin detection processing circuitry only performs computations during the read-out phase, enabling real-time processing. Fully programmable, the proposed skin detection processing circuitry …
Equivalences Between Pure Type Systems And Systems Of Illative Combinatory Logic, Martin Bunder, Willibrordus Dekkers
Equivalences Between Pure Type Systems And Systems Of Illative Combinatory Logic, Martin Bunder, Willibrordus Dekkers
Faculty of Informatics - Papers (Archive)
Pure Type Systems, PTSs, were introduced as a generalization of the type systems of Barendregt’s lambda cube and were designed to provide a foundation for actual proof assistants which will verify proofs. Systems of illative combinatory logic or lambda calculus, ICLs, were introduced by Curry and Church as a foundation for logic and mathematics. In an earlier paper we considered two changes to the rules of the PTSs which made these rules more like ICL rules. This led to four kinds of PTSs. Most importantly PTSs are about statements of the form M : A, where M is a term …
A Simple Element Inverse Jacket Transform Coding, Moon Ho Lee, Kenneth Finlayson
A Simple Element Inverse Jacket Transform Coding, Moon Ho Lee, Kenneth Finlayson
Faculty of Informatics - Papers (Archive)
Jacket transforms are a class of transforms which are simple to calculate, easily inverted and are size-flexible. Previously reported jacket transforms were generalizations of the well-known Walsh-Hadamard transform (WHT) and the center-weighted Hadamard transform (CWHT). In this paper we present a new class of jacket transform not derived from either the WHT or the CWHT. This class of transform can be applied to any even length vector, and is applicable to finite fields and is useful for constructing error control codes.
Optical Phase Shifting With Acousto-Optic Devices, Enbang Li, Jianquan Yao, Daoyin Yu, Jiangtao Xi, Joe F. Chicharo
Optical Phase Shifting With Acousto-Optic Devices, Enbang Li, Jianquan Yao, Daoyin Yu, Jiangtao Xi, Joe F. Chicharo
Faculty of Informatics - Papers (Archive)
A novel optical phase-shifting method based on a well-known acousto-optic interaction is proposed. By using a pair of acousto-optic modulators (AOMs) and properly aligning them, we construct an optical phase shifter that can directly control the phase of a collimated beam. The proposed phase shifter is insensitive to the polarization of the incident beam when polarization-insensitive AOMs are used, and no calibration is necessary. The proposed approach is confirmed with experimental results.
Effects Of Fiber Cladding On Uv Beams And Fringe Patterns In Side-Exposure Fbg Writing, Enbang Li, Jiangtao Xi, Joe F. Chicharo, Yanguang Yu, Jianquan Yao
Effects Of Fiber Cladding On Uv Beams And Fringe Patterns In Side-Exposure Fbg Writing, Enbang Li, Jiangtao Xi, Joe F. Chicharo, Yanguang Yu, Jianquan Yao
Faculty of Informatics - Papers (Archive)
The so-called side-exposure method has been widely used in the fabrication of fiber Bragg gratings (FBGs). The effects of the fiber cladding on the wavefronts of the UV writing beams and the interference fringes formed inside the fiber have been addressed in this study. The wavefronts of the UV beams have been analyzed and it has been demonstrated that the existence of the fiber cladding significantly alters the wavefronts of the UV beams in one plane and makes them highly astigmatic. Based on the calculated wavefront radii of the UV beams, a model has been established for prediction of the …
Multi-Channel Fbg Sensing System Using A Dense Wavelength Division Demultiplexing Module, Enbang Li, Jiangtao Xi, Yanguang Yu, Joe F. Chicharo, Jianquan Yao
Multi-Channel Fbg Sensing System Using A Dense Wavelength Division Demultiplexing Module, Enbang Li, Jiangtao Xi, Yanguang Yu, Joe F. Chicharo, Jianquan Yao
Faculty of Informatics - Papers (Archive)
Fiber Bragg grating (FBG) sensing is gaining attention in both scientific research areas and engineering applications thanks to its distinguishing advantages including wavelength multiplexing capability, miniature size, high sensitivity, immunity from electro-magnetic interference, etc. FBG sensing is based on the detection of the shifted Bragg wavelength of the light reflected by a fiber grating which is sensitive to various physical parameters such as strain and temperature. One of the challenging tasks in FBG sensing is to determine the Bragg wavelength shift, which can be done by using an optical spectrum analyzer (OSA). An OSA is suitable for laboratory tests, but …
Performance Comparison Of Sequences Designed From The Hall Difference Set And Orthogonal Gold Sequences Of Length 32, Jennifer Seberry, Beata J. Wysocki, Tadeusz A. Wysocki
Performance Comparison Of Sequences Designed From The Hall Difference Set And Orthogonal Gold Sequences Of Length 32, Jennifer Seberry, Beata J. Wysocki, Tadeusz A. Wysocki
Faculty of Informatics - Papers (Archive)
In the paper we perform a performance comparison between two sets of orthogonal spreading sequences i.e. sequences based on the Hadamard matrix of order 32 constructed using the Hall difference set and orthogonal Gold sequences of length 32. Both considered sets of sequences are characterised by low peaks in the aperiodic cross-correlation functions and have also good aperiodic auto-correlation properties.
Agent-Based Coalitions In Dynamic Supply Chains, Chattrakul Sombattheera, Aditya K. Ghose
Agent-Based Coalitions In Dynamic Supply Chains, Chattrakul Sombattheera, Aditya K. Ghose
Faculty of Informatics - Papers (Archive)
Coalition formation is an important issue in multi-agent systems. Recent work in the area has focused on reducing the complexity of forming coalitions, i.e., each agent deliberately searches for potential coalition members before negotiating with them. We propose a framework for coalition formation of agents in a dynamic supply chain environment. The framework is composed of a negotiation protocol and a decision mechanism. The negotiation protocol allows thorough communication among agents across sectors (buyers, sellers, logistic providers). With the decision mechanism, agents take two steps to form coalitions: i) agents in each sector form loosely-coupled coalitions in order to decrease …
Secure Key Extraction In Computer Networks, Willy Susilo, Yi Mu, Xinyi Huang
Secure Key Extraction In Computer Networks, Willy Susilo, Yi Mu, Xinyi Huang
Faculty of Informatics - Papers (Archive)
Security of computer networks normally relies on a trusted authority who is responsible for setting up the system and distributing cryptographic keys. If the trusted authority is compromised due to an attack, then the security of the entire system will be compromised. In this paper, we will look into this issue in terms of identity-based (or ID-based) cryptography. Since the introduction of identity-based (or ID-based) cryptography in 1984 by Shamir, IDbased cryptography has attracted many research due to its simplicity. However, ID-based cryptography suffers from several drawbacks, namely the requirement of having a secure channel during the key extraction and …
Decision Aided Compensation Of Residual Frequency Offset For Mimo-Ofdm Systems With Nonlinear Channel, Shouyi Yang, Jiangtao Xi, Fang Wang, Xiaomin Mu, Hideo Kobayashi
Decision Aided Compensation Of Residual Frequency Offset For Mimo-Ofdm Systems With Nonlinear Channel, Shouyi Yang, Jiangtao Xi, Fang Wang, Xiaomin Mu, Hideo Kobayashi
Faculty of Informatics - Papers (Archive)
In this paper, we propose a new approach to compensate the residual frequency offset (RFO) in multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) system with nonlinear channel working in the burst mode. The proposed approach consists of two stages. Firstly a decision aided method is proposed to eliminate the nonlinearity introduced by high power transmit amplifier (HPA). Then a new decision aided approach is employed to achieve the RFO compensation on the nonlinearity-free symbols. The effectiveness of the proposed approach has been verified by computer simulations.
Estimating The Parameters Of Semiconductor Lasers Based On Weak Optical Feedback Interferometry, Jiangtao Xi, Yanguang Yu, Joe F. Chicharo, Thierry Bosch
Estimating The Parameters Of Semiconductor Lasers Based On Weak Optical Feedback Interferometry, Jiangtao Xi, Yanguang Yu, Joe F. Chicharo, Thierry Bosch
Faculty of Informatics - Papers (Archive)
The paper presents a new approach for measuring the linewidth enhancement factor (LEF) of semiconductor lasers (SL) and the optical feedback level factor C in SLs. The proposed approach is based on the analysis of self-mixing signals observed in self-mixing optical feedback interferometry. Unlike existing approaches, the approach tries to estimate the parameters LEF and C by a gradient-based optimization algorithm that achieves best data-to-theoretical model fitting. The effectiveness and accuracy of the method have been confirmed and tested by theoretical analysis and computer simulations.
Face Recognition With Ctfm Sonar, Kok Kai Yoong, Phillip J. Mckerrow
Face Recognition With Ctfm Sonar, Kok Kai Yoong, Phillip J. Mckerrow
Faculty of Informatics - Papers (Archive)
The use of biometrics, such as iris, thumbprints, voice, face, etc, for authentication have become commonplace. In this research, we are attempting to classify human faces using CTFM (Continuously Transmitted Frequency Modulated) sonar in place of the normally used computer vision. However, for this preliminary paper, the main objectives are to find out the range relationships between human facial features and how they are represented in echoes, and to test the quality of echo features for three faces from a single orientation. The tested features are features that were effective in past research into classifying objects from ultrasonic echoes. We …
Behavioral Footprinting: A New Dimension To Characterize Self-Propagating Worms, Xuxian Jiang, Dongyan Xu
Behavioral Footprinting: A New Dimension To Characterize Self-Propagating Worms, Xuxian Jiang, Dongyan Xu
Department of Computer Science Technical Reports
No abstract provided.
Some Comments On: Existence Of Solutions Of Abstract Nonlinear Second-Order Neutral Functional Integrodifferential Equations, Eduardo Hernandez, Mark A. Mckibben
Some Comments On: Existence Of Solutions Of Abstract Nonlinear Second-Order Neutral Functional Integrodifferential Equations, Eduardo Hernandez, Mark A. Mckibben
Mathematics Faculty Publications
We establish the existence of mild solutions for a class of abstract second-order partial neutral functional integro-differential equations with infinite delay in a Banach space using the theory of cosine families of bounded linear operators and Schaefer's fixed-point theorem.
Powers Of A Matrix And Combinatorial Identities, James Mclaughlin, B. Sury
Powers Of A Matrix And Combinatorial Identities, James Mclaughlin, B. Sury
Mathematics Faculty Publications
In this article we obtain a general polynomial identity in k variables, where k ≥ 2 is an arbitrary positive integer. We use this identity to give a closed-form expression for the entries of the powers of a k × k matrix. Finally, we use these results to derive various combinatorial identities.
Ten More Years Of Educational Technologies In Education: How Far Have We Travelled?, Ron Oliver
Ten More Years Of Educational Technologies In Education: How Far Have We Travelled?, Ron Oliver
Research outputs pre 2011
This paper describes the advancements that have occurred in the use of educational technologies over the past ten years (1995-2005) and argues that progress has been slow and reminiscent of the slow progress observed in the previous decade (1985-1995). The paper argues that one of the principal reasons for the less than spectacular results stems from the top-down approaches that always seem to drive technology use in education and schools. It argues the need for applications and activities to be driven by bottom-up forces, by the teachers and students themselves and presents the argument that more applied and grounded research …
Factors Affecting Regional Variation In Growth Of Channel Catfish, Bart W. Durham, Kevin L. Pope, Gene R. Wilde
Factors Affecting Regional Variation In Growth Of Channel Catfish, Bart W. Durham, Kevin L. Pope, Gene R. Wilde
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
We related the length at age of channel catfish Ictalurus punctatus, an indirect measure of growth, to three climatic and five morphoedaphic variables in 144 Texas reservoirs. Growth of channel catfish ages 3 through 6 was negatively related to longitude, a factor that explained as much as 34% of the variation in length at age. Channel catfish length at age was not significantly related to latitude, conductivity, morphoedaphic index, mean depth, and maximum depth in all age-classes. Among age-7 channel catfish, length at age was positively related to reservoir area, which explained 35% of the variation in growth. A …
Magnetic Moments And Adiabatic Magnetization Of Free Cobalt Clusters, Xiaoshan Xu, Shuangye Yin, Ramiro Moro, Walt A. De Heer
Magnetic Moments And Adiabatic Magnetization Of Free Cobalt Clusters, Xiaoshan Xu, Shuangye Yin, Ramiro Moro, Walt A. De Heer
Xiaoshan Xu Papers
Magnetizations and magnetic moments of free cobalt clusters CoN (12< N <200) in a cryogenic (25 K ≤ T ≤ 100 K) molecular beam were determined from Stern-Gerlach deflections. All clusters preferentially deflect in the direction of the increasing field and the average magnetization resembles the Langevin function for all cluster sizes even at low temperatures. We demonstrate in the avoided crossing model that the average magnetization may result from adiabatic processes of rotating and vibrating clusters in the magnetic field and that spin relaxation is not involved. This resolves a longstanding problem in the interpretation of cluster beam deflection experiments with implications for nanomagnetic systems in …200)>
The Nebraska Natural Legacy Project, Rick Schneider, Mark Humpert, Kristal Stoner, Gerry Steinauer
The Nebraska Natural Legacy Project, Rick Schneider, Mark Humpert, Kristal Stoner, Gerry Steinauer
Nebraska Game and Parks Commission: Publications
When the Nebraska Game and Parks Commission began work on a comprehensive wildlife conservation strategy (Nebraska Natural Legacy Project) two and a half years ago, we had to decide on an approach that would ensure we developed the best plan possible. The agency could have drawn only from the expertise of professional biologists, or alternatively sought input from a wide diversity of stakeholders. We decided to utilize both and what resulted was one of the largest collaborative efforts ever undertaken on behalf of wildlife in the state’s history. Sixteen public input meetings, a conservation practitioners workshop, and dozens of meetings …
Broadening Middle-School Students’ Images Of Science And Scientists, Diandra Leslie-Pelecky, Gayle A. Buck, Angela Zabawa
Broadening Middle-School Students’ Images Of Science And Scientists, Diandra Leslie-Pelecky, Gayle A. Buck, Angela Zabawa
Diandra Leslie-Pelecky Publications
The ‘mad scientist’ stereotype is alive and well – and not an image most K-12 students can (or want to) embrace. Project Fulcrum, a National Science Foundation-funded GK-12 program, partners math, science and engineering graduate students with elementary and middle-level teachers. One project goal – broadening student images of science and scientists –is addressed by projects developed by the teacher/scientist teams that are focused on the specific needs of their students. The projects developed focus on scientists, the use of science in different types of jobs, and developing scientific skills. Pre-project research, in which teachers probe the motivation behind their …
Kentucky Water Resources Research Institute Annual Technical Report Fy 2004, Kentucky Water Resources Research Institute, University Of Kentucky
Kentucky Water Resources Research Institute Annual Technical Report Fy 2004, Kentucky Water Resources Research Institute, University Of Kentucky
KWRRI Annual Technical Reports (USGS’s 104b Grant Program)
The FY 2004 Annual Technical Report for Kentucky consolidates reporting requirements of the Section 104(b) base grant award in a single technical report that includes: 1) a synopsis of each research project supported during the period, 2) a list of related reports, 3) a description of information transfer activities, 4) a summary of student support during the reporting period, and 5) notable achievements and awards during the year.
Effects Of Supplementation Of Whole Corn Germ On Reproductive Performance, Calf Performance, And Leptin Concentration In Primiparous And Mature Beef Cows, J. L. Martin, Richard J. Rasby, Dennis R. Brink, R. U. Lindquist, D. H. Keisler, Stephen D. Kachman
Effects Of Supplementation Of Whole Corn Germ On Reproductive Performance, Calf Performance, And Leptin Concentration In Primiparous And Mature Beef Cows, J. L. Martin, Richard J. Rasby, Dennis R. Brink, R. U. Lindquist, D. H. Keisler, Stephen D. Kachman
Department of Statistics: Faculty Publications
A 2-yr study using primiparous and multiparous, spring-calving, crossbred beef cows was conducted to evaluate the effects of supplemental whole corn germ on reproductive performance, calf performance, and serum leptin concentrations. Each year, cows were blocked by age and BCS and assigned randomly to one of three treatments: PRE (n = 115) cows received 1.14 kg/d (DM basis) of whole corn germ for approximately 45 d before calving; POST (n = 109) cows were fed 1.14 kg/d of whole corn germ for approximately 45 d after calving; and control cows (n = 118) were fed similar energy and protein from …
On The Linear Combination Of Exponential And Gamma Random Variables, Saralees Nadarajah, Samuel Kotz
On The Linear Combination Of Exponential And Gamma Random Variables, Saralees Nadarajah, Samuel Kotz
Department of Statistics: Faculty Publications
The exact distribution of the linear combination αX + βY is derived when X and Y are exponential and gamma random variables distributed independently of each other. A measure of entropy of the linear combination is investigated. We also provide computer programs for generating tabulations of the percentage points associated with the linear combination. The work is motivated by examples in automation, control, fuzzy sets, neurocomputing and other areas of computer science.
Reliability For Some Bivariate Gamma Distributions, Saralees Nadarajah
Reliability For Some Bivariate Gamma Distributions, Saralees Nadarajah
Department of Statistics: Faculty Publications
In the area of stress-strength models, there has been a large amount of work as regards estimation of the reliability R = Pr(X < Y). The algebraic form for R = Pr(X < Y) has been worked out for the vast majority of the well-known distributions when X and Y are independent random variables belonging to the same univariate family. In this paper, we consider forms of R when (X,Y) follows a bivariate distribution with dependence between X and Y. In particular, we derive explicit expressions for R when the joint distribution is …
On The Product And Ratio Of Laplace And Bessel Random Variables, Sarlees Nadarajah
On The Product And Ratio Of Laplace And Bessel Random Variables, Sarlees Nadarajah
Department of Statistics: Faculty Publications
The distributions of products and ratios of random variables are of interest in many areas of the sciences. In this paper, the exact distributions of the product |XY| and the ratio |X/Y| are derived when X and Y are Laplace and Bessel function random variables distributed independently of each other.
On The Product And Ratio Of Laplace And Bessel Random Variables, Saralees Nadarajah
On The Product And Ratio Of Laplace And Bessel Random Variables, Saralees Nadarajah
Department of Statistics: Faculty Publications
The distributions of products and ratios of random variables are of interest in many areas of the sciences. In this paper, the exact distributions of the product |XY| and the ratio |X/Y| are derived when X and Y are Laplace and Bessel function random variables distributed independently of each other.
On The Product And Ratio Of Bessel Random Variables, Saralees Nadarajah, Arjun K. Gupta
On The Product And Ratio Of Bessel Random Variables, Saralees Nadarajah, Arjun K. Gupta
Department of Statistics: Faculty Publications
The distributions of products and ratios of random variables are of interest in many areas of the sciences. In this paper, the exact distributions of the product |XY| and the ratio |X/Y| are derived when X and Y are independent Bessel function random variables. An application of the results is provided by tabulating the associated percentage points.
A Generalized Logistic Distribution, Saralees Nadarajah, Samuel Kotz
A Generalized Logistic Distribution, Saralees Nadarajah, Samuel Kotz
Department of Statistics: Faculty Publications
A generalized logistic distribution is proposed, based on the fact that the difference of two independent Gumbel-distributed randomvariables has the standard logistic distribution.