Physical Sciences and Mathematics Commons^™

Further Observations On The Structure Of The Aes Algorithm, B. Song, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

Abstract. We present our further observations on the structure of the AES algorithm relating to the cyclic properties of the functions used in this cipher. We note that the maximal period of the linear layer of the AES algorithm is short, as previously observed by S. Murphy and M.J.B. Robshaw. However, we also note that when the non-linear and the linear layer are combined, the maximal period is dramatically increased not to allow algebraic clues for its cryptanalysis. At the end of this paper we describe the impact of our observations on the security of the AES algorithm. We conclude …

Regular Hadamard Matrices, Maximum Excess And Sbibd, Tianbing Xia, M. Xia, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

When k = q1, q2, q1q2, q1q4, q2q3N, q3q4N, q1, q2 and q3 are prime power, where q1 ≡ 1 (mod 4), q2 ≡ 3 (mod 8), q3 ≡ 5 (mod 8), q4 = 7 or 23, N = 2a3bt2, a, b = 0 or 1, t ≠ 0 is an arbitrary integer, we prove that there exist regular Hadamard matrices of order 4k2, and also there exist SBIBD(4k2, 2k2 + k, k2 + k). We find new SBIBD(4k2, 2k2 + k, k2 + k) for 233 values of k.

Orthogonal Designs Of Kharaghani Type: I, C. Koukouvinos, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

We use an array given in H. Kharaghani, Arrays for orthogonal designs, J. Combin. Designs, 8 (2000), 166-173, to obtain infinite families of 8-variable Kharaghani type orthogonal designs, OD(8t; hi, kl, kl, kl, k2, k2, k2, k2), where k1 and k2 must be the sum of two squares. In particular we obtain infinite families of 8-variable Kharaghani type orthogonal designs, OD(8t; k, k, k, k, k, k, k, k). For odd t orthogonal designs of order ≡ 8( mod 16) can have at most eight variables.

Some Results On Kharaghani Type Orthogonal Designs, S. Georgiou, C. Koukouvinos, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

In this paper we give a general theorem which can be used to multiply the length of amicable sequences keeping the amicability property and the type of the sequences. As a consequence we have that if there exist two, four or eight amicable sequences of length m and type (al, a2), (al, a2, a3, a4) or (al, a2, …, as) then there exist amicable sequences of length ℓ ≡ 0 (mod m) and of the same type. We also present a theorem that produces a set of 2v amicable sequences from a set of v (not necessary amicable) sequences and …

An Algorithm To Find Formulae And Values Of Minors For Hadamard Matrices: Ii, C. Koukouvinos, E. Lappas, M. Mitrouli, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

An algorithm computing the (n — j) x (n — j ) , j = 1, 2, ... minors of Hadamard matrices of order n is presented. Its implementation is analytically described step by step for several values of n and j. For j = 7 the values of minors are computed for the first time. A formulae estimating all the values of (n — j) x (n — j) minors is predicted.

Recovery Performance Of Pgm With Redundancy Estimation For Proactive Fec, Sonia Fahmy, Renin M. Jegadeesan

Department of Computer Science Technical Reports

No abstract provided.

On Detecting Bandwidth Theft Attacks And Sla Violations In Qos Networks, Sonia Fahmy, Srinivas R. Avasarala, Venkatesh Prabhakar

Department of Computer Science Technical Reports

No abstract provided.

Towards Cost-Effective On-Demand Continuous Media Service: A Peer-To- Peer Approach, Yicheng Tu, Shan Lei

Department of Computer Science Technical Reports

No abstract provided.

Bis[Μ-1,2-Bis(2-Pyridyl)Ethyne-K2N:N']Bis[Aquadinitratocadmium(Ii)], Badruz Zaman Md., Matthew J. Davis, Mark D. Smith, Hans Conrad Zur Loye

Faculty Publications

Two twisted 1,2-bis(2-pyridyl)ethyne ligands bridge two Cd²⁺ centers in the C₂-symmetric title complex, [Cd₂(NO₃)₄(-C₁₂H₈N₂)₂(H₂O)₂]. The bridging ligands arch across one another creating a `zigzag loop' molecular geometry. Two nitrate ions and a water molecule complete the irregular seven-coordinate Cd-atom environment. The dihedral angles between the equivalent pyridyl ring planes of the two independent ligands are 67.2 (1)°. O_water-HO_nitrate hydrogen bonding creates two-dimensional layers parallel to the ab plane.

Formula: [Cd₂(NO₃)₄(C …

A New Message-Based Protocol For Building A Platform And Language Independent Distributed Object Model, Hazem S. El Ashmawi

Archived Theses and Dissertations

Standardization of messaging topologies for communication in recent distributed object computing architectures is becoming more and more inevitable. The emergence of a structured and flexible document model as XML has made an entry point towards this goal. In this thesis, we are utilizing the flexibility of XML and the simplicity of low -level socket communication to build a generalized messaging model that provides a basis for standardization and supports interoperability among existing distributed object computing architectures. The proposed system is composed of the basic components of a distributed architecture constituting a number of broker components acting as naming services and …

Digital Art Forensics, Siwei Lyu, Daniel Rockmore, Hany Farid

Computer Science Technical Reports

We describe a computational technique for digitally authenticating works of art. This approach builds statistical models of an artist from a set of authenticated works. Additional works are then authenticated against this model. The statistical model consists of first- and higher-order wavelet statistics. We show preliminary results from our analysis of thirteen drawings by Pieter Bruegel the Elder. We also present preliminary results showing how these techniques may be applicable to determining how many hands contributed to a single painting.

Self-Adjusting Congestion Avoidance Routing Protocol For Ad Hoc Networks, Yi Lu, Bharat Bhargava

Department of Computer Science Technical Reports

No abstract provided.

Vulnerabilities And Safe-Guards In Networks With Qos Support, Sonia Fahmy, Srinivas R. Avasarala, Venkatesh Prabhakar

Department of Computer Science Technical Reports

No abstract provided.

Deployment Considerations For The Tcp Vegas Congestion Control Algorithm, Sonia Fahmy, Mridul Sharma

Department of Computer Science Technical Reports

No abstract provided.

Projectile-Charge Sign Dependence Of Four-Particle Dynamics In Helium Double Ionization, Daniel Fischer, Robert Moshammer, Alexander Dorn, Jose R. Crespo Lopez-Urrutia, Bernold Feuerstein, C. Hohr, Claus Dieter Schroter, Siegbert Hagmann, Holger Kollmus, Rido Mann, Bhas Bapat, Joachim Hermann Ullrich, Holger Kollmus

Physics Faculty Research & Creative Works

Double ionization of helium by 6 MeV proton impact has been explored in a kinematically complete experiment using a “reaction microscope.” For the first time, fully differential cross sections for positively charged projectiles have been obtained and compared with data from 2 keV electron impact. The significant differences observed in the angular distribution of the ejected electrons are attributed to the charge sign of the projectile, resulting in different dynamics of the four-particle Coulomb system, which is not considered in the first Born approximation.

Sol-Gel-Platform Optical Sensors For Oxygen Gas : Sensor Development And Investigation Of Probe Partitioning In Sol-Gel Matrices, Desiree L. Plata

Honors Theses

I have developed gas sensors that respond rapidly and noticeably to changes in oxygen concentration by doping fluorescent complexes into gas-permeable sol-gel materials. Ruthenium (II) 4,7-diphenyl-1,10- phenanthroline, Ru(dpp)32+, responds to variations in ambient oxygen concentrations through marked changes in its fluorescence intensity. I investigated the response of Ru(dpp)32+ to oxygen in solution, in aerogels (sol gels dried under ambient conditions) and in aerogels (sol gels dried using supercritical conditions). Aerogels have particularly high porosity and low density, which allows for rapid diffusion of gases into the material. The aerogel sensor responds reversibly to changes in ambient oxygen concentration within 10 …

The Use Of Fluorescence To Investigate The Factors Leading To Complex Formation Between Naphthalenes And ├Ƒ-Cyclodextrins, Jamie M. Iannacone

Honors Theses

Fraiji et al. determined a binding constant (K) of 581 = 6 M-1 for the 1:1 complex between 2-acetylnaphthalene (2-AN) and β-cyclodextrin (β-CD) in H20 using fluorescence quenching experiments (Appl. Spectrosc. 1994, 48, 79). Molecular modeling experiments indicate the possibility of complex stabilization resulting from hydrogen bonds between the C=O group of 2-AN and the -OH groups on the rim of β-CD. To check this possibility, we measured the K of the 2-AN:trimethyl-β-CD (TM-β- CD) complex, where all rim -OH groups are converted to –OCH3. In this case, K decreases to 134 M-1. To show that this is due to …

Solution Structure Refinement Comparing Reference Model Noe Volumes, Maura Mahar

Honors Theses

NMR is a powerful experimental technique which can be used to determine protein structures. Central to this process is conversion of peak volumes in the NOE data sets into distance constraints and then structural refinement against those constraints. In general, each solution structural analysis is initiated de novo. We are interested in the structural analysis of a series of hybrids derived from two parental proteins (rubredoxins from mesophilic bacterium Clostridium pasteurianum (Cp) and the hyperthermophilic archaeon Pyrococcus furiosus (Pf)). Near 1 A resolution X-ray structures of Cp and Pf rubredoxins are available to provide a basis for quantitative comparison of …

Investigation Of Indicators In Aerogels And Xerogels, Rebecca L. Wolfe

Honors Theses

A sol-gel is a silicon-oxygen matrix that is suitable for the entrapment of chemical species, including biological species, indicators, dyes, and sensors. Aerogels are sol-gels prepared by supercritical extraction, whereas aerogels are allowed to dry under ambient conditions. The resulting materials differ considerably in their physical properties. We are investigating a series of luminescent species for use as probes of the microenvironment in different sol-gel materials. Sol gels containing each probe are prepared as both aerogels and aerogels; aerogels are formed using a novel contained mold process. Spectral properties, including absorption or excitation spectra, emission spectra, time-based fluorescence scans, and …

The Prairie Naturalist Volume 35, No.2 June 2003

The Prairie Naturalist

NEST PARASITISM ON CONSTRUCTED ISLANDS IN NORTHWESTERN NORTH DAKOTA ▪ A. L. Zimmerman, M. A. Sovada, T. K. Kessler, and R. K. Murphy

HISTORICAL AND RECENT RECORDS AND FIRST NEST RECORDS OF HENSLOW'S SPARROW IN NORTH DAKOTA ▪ J. A. Shaffer, L. D. Igl, and F. Vanhove

AMERICAN AVOCET NESTING ON CONSTRUCTED ISLANDS IN NORTH DAKOTA ▪ A. L. Dahl, D. H. Johnson, L. D. Igl, K. L. Baer, T. L. Shaffer, M. A. Johnson, and R. E. Reynolds

CHRISTMAS BIRD COUNTS FOR NORTH DAKOTA 2002 ▪ R. N. Randall

MATERNAL LIVER AND EGG THIAMINE CONCENTRATIONS IN CHINOOK SALMON FROM …

Optical Solitons In A Three-State Medium, Talal Ghannam

Masters Theses

When a beam of light propagates within a typical medium, absorption is a common phenomenon. This happens when the frequency of the light is close to a resonant frequency of the atoms composing the medium. But in the past few decades, it has been shown that in certain circumstances, carefully chosen pulse shapes are able to propagate without significant absorption even when the frequency of the light is close to an atomic resonant frequency. It was called Self Induced Transparency (SIT).

This phenomenon was intensively studied in the two-state systems. On the other hand, the three-state systems seems not to …

The Fibonacci Numbers -- Exposed More Discretely, Arthur T. Benjamin, Jennifer J. Quinn

All HMC Faculty Publications and Research

No abstract provided in this article.

Fluorescence In Ultraviolet Active Binaries: The Case Of Ff Aquarii, Todd R. Vaccaro, R. E. Wilson

Physics and Astronomy Faculty Publications

The eclipsing binary FF Aquarii (FF Aqr) consists of a small hot star of uncertain type and a red giant. An Hα feature varies from absorption during eclipse to maximum emission during hot star transit. We have obtained simultaneous differential photometry in BVRI bands and Hα spectroscopy in 1998 that covered an entire orbit with some overlap. A binary star model was used with our light-curve, radial velocity and Hα data to refine stellar and orbital parameters. A new ephemeris indicates that the period has increased or is longer than previously thought. A physically simple algorithm is developed that generates …

Adding Semantics To Web Services Standards, Kaarthik Sivashanmugam, Kunal Verma, Amit P. Sheth, John Miller

Kno.e.sis Publications

With the increasing growth in popularity of Web services, discovery of relevant Web services becomes a significant challenge. One approach is to develop semantic Web services where by the Web services are annotated based on shared ontologies, and use these annotations for semantics-based discovery of relevant Web services. We discuss one such approach that involves adding semantics to WSDL using DAML+OIL ontologies. Our approach also uses UDDI to store these semantic annotations and search for Web services based on them. We compare our approach with another initiative to add semantics to support Web service discovery, and show how our approach …

Effect Of H-2 On The Martian Ionosphere: Implications For Atmospheric Evolution, Jane L. Fox

Physics Faculty Publications

Because H₂ reacts efficiently with O⁺, CO₂ ⁺, CO⁺, and N₂ ⁺, the molecular hydrogen abundance assumed in models of the Martian ionosphere greatly affects the high altitude density profiles of these ions. We have found that models of the low solar activity Martian ionosphere exhibit much smaller O⁺ densities than the measured values if the adopted H₂ abundance is of the order of 40 ppm, the value proposed in a 1998 model of the Martian atmosphere. For a model based on the recently measured H₂ abundance of …

A Combined Heating Cooling Stage For Cluster Thermalization In The Gas Phase, D. N. Ievlev, A. Küster, Axel Enders, N. Malinowski, H. Schaber, Klaus Kern

Axel Enders Publications

We report on the design and performance of a combined heating/cooling stage for the thermalization of clusters in a gas phase time-of-flight mass spectrometer. With this setup the cluster temperature can sensitively be adjusted within the range from 100 up to 800 K and higher. The unique combination of a heating stage with a subsequent cooling stage allows us to perform thermodynamic investigations on clusters at very high temperatures without quality losses in the spectra due to delayed fragmentation in the drift tube of the mass spectrometer. The performance of the setup is demonstrated by the example of (C_{60 …}

Black Hole Attractor Varieties And Complex Multiplication, Monika Lynker, Vipul Periwal, Rolf Schimmrigk

Faculty Articles

Black holes in string theory compactified on Calabi-Yau varieties a priori might be expected to have moduli dependent features. For example the entropy of the black hole might be expected to depend on the complex structure of the manifold. This would be inconsistent with known properties of black holes. Supersymmetric black holes appear to evade this inconsistency by having moduli fields that flow to fixed points in the moduli space that depend only on the charges of the black hole. Moore observed in the case of compactifications with elliptic curve factors that these fixed points are arithmetic, corresponding to curves …

Kentucky River Basin: Unified Long-Range Water Resources Plan. Historic Water Supply Plans Of The Kentucky River Basin, Lindell E. Ormsbee, Malissa Mcalister

KWRRI Research Reports

The Kentucky River Authority was mandated by regulatory statute 420 KAR I :030, Section 4 to develop a Unified Long-Range Water Resources Plan (ULRWRP) for the Kentucky River Basin. This summary document was written by the Kentucky Water Resources Research Institute under a contractual agreement with the Kentucky River Authority in support of this plan. It addresses several required components of the ULRWRP, including:

• Acquisition and utilization of the Kentucky River Lock and Dam system;
• Construction, acquisition and control of projects and facilities;
• Regulation of flows and allocation of supplies;
• Basin-wide and specific local land and water conservation measures and …

Kentucky River Basin: Unified Long-Range Water Resources Plan. Executive Summary, Lindell E. Ormsbee, Malissa Mcalister

KWRRI Research Reports

No abstract provided.

Vertical Nanowire Transistor In Flexible Polymer Foil, Jie Chen, Rolf Könenkamp

Physics Faculty Publications and Presentations

Fabrication and operation of a vertical nanowire field-effect transistor is reported. The device is prepared by growing vertical wires in the cylindrical pores of a polymer foil stack. The nanowirediameter is approximately 100 nm, the packing density up to 10⁸ cm⁻². The polymer foil stack consists of two polymer layers and an intermediate metal layer. Cylindrical holes are prepared in this stack by using fast ion irradiation and subsequent etching. Well-defined cylindrical openings with diameters between 50 and 150 nm are obtained. The semiconductor growth involves electrodeposition of the p-type quaternary compound CuSCN. Electrical measurements on first devices show transistor …