Computer Sciences Commons^™

Label Noise Cleaning Using Support Vector Machines, Rajmadhan Ekambaram

USF Tampa Graduate Theses and Dissertations

Mislabeled examples affect the performance of supervised learning algorithms. Two novel approaches to this problem are presented in this Thesis. Both methods build on the hypothesis that the large margin and the soft margin principles of support vector machines provide the characteristics to select mislabeled examples. Extensive experimental results on several datasets support this hypothesis. The support vectors of the one-class and two-class SVM classifiers captures around 85% and 99% of the randomly generated label noise examples (10% of the training data) on two character recognition datasets. The numbers of examples that need to be reviewed can be reduced by …

Direct Band Gap Gallium Antimony Phosphide (GasbXP1-X) Alloys, H. B. Russell, A. N. Andriotis, Madhu Menon, J. B. Jasinski, A. Martinez-Garcia, M. K. Sunkara

Center for Computational Sciences Faculty Publications

Here, we report direct band gap transition for Gallium Phosphide (GaP) when alloyed with just 1–2 at% antimony (Sb) utilizing both density functional theory based computations and experiments. First principles density functional theory calculations of GaSb_xP_1−x alloys in a 216 atom supercell configuration indicate that an indirect to direct band gap transition occurs at x = 0.0092 or higher Sb incorporation into GaSb_xP_1−x. Furthermore, these calculations indicate band edge straddling of the hydrogen evolution and oxygen evolution reactions for compositions ranging from x = 0.0092 Sb up to at least x = 0.065 …

All Aboard, All Attuned And All Involved: Fostering Learner Engagement And Teamwork With Clickers In An Introductory Computer Science Course At Winthrop University, Patrick Guilbaud, Michael Whitney

Winthrop Conference on Teaching and Learning

Modern education technology tools and learning systems provide the means for faculty to develop courses that offer connected and engaging learning opportunities. However, many courses, particularly those in the sciences and engineering disciplines, are not often designed to encourage collaboration, cooperation and teamwork.

Given the presence of a global and interconnected economy, it is critical for students to interact with classmates who hold diverse perspectives, experiences and opinions. Moreover, research shows that students who have had the opportunity to participate in learning activities with heterogeneous teams --early in their college life-- are more likely to develop lasting relationships with classmates …

Design And Analysis Of A Single-Camera Omnistereo Sensor For Quadrotor Micro Aerial Vehicles (Mavs), Carlos Jaramillo, Roberto G. Valenti, Ling Guo, Jizhong Xiao

Publications and Research

We describe the design and 3D sensing performance of an omnidirectional stereo (omnistereo) vision system applied to Micro Aerial Vehicles (MAVs). The proposed omnistereo sensor employs a monocular camera that is co-axially aligned with a pair of hyperboloidal mirrors (a vertically-folded catadioptric configuration). We show that this arrangement provides a compact solution for omnidirectional 3D perception while mounted on top of propeller-based MAVs (not capable of large payloads). The theoretical single viewpoint (SVP) constraint helps us derive analytical solutions for the sensor’s projective geometry and generate SVP-compliant panoramic images to compute 3D information from stereo correspondences (in a truly synchronous …

Real-Time Webpage Adaptation For Improved User Accessibility, Parker Williams, Jeff Jenkins

Journal of Undergraduate Research

Hand tremors are experienced by millions of individuals on a daily basis, the main cause being neurological disorders and neurodegenerative diseases. Essential Tremor, “a progressive neurologic condition that causes involuntary rhythmic trembling of the hands,” affects 10 million Americans of all ages¹. It is estimated that 87% of individuals ages 18-29, 86% of individuals ages 30-49, 76% of individuals ages 50-64, and 70% of individuals ages 65 and older go online daily². With an increasing number of individuals who have access to and use of the internet, creating a real-time adaptable webpage environment for those with …

Epigenetic Cost Matrix, Spring Cullen, Dr. Mark Clement

Journal of Undergraduate Research

Epigenetics is of vital importance, comparable to genetics, in predicting the outcome of illnesses. Bisulfite sequencing (BS) provides short DNA fragments that must be mapped in order to discover epigenetic markers. The purpose of this project is to find an optimal cost matrix to map sequences from BS DNA to a reference genome to determine patterns of methylation. A more efficient BS cost matrix will contribute to the ongoing effort to understand the epigenome and analyze data collected.

Incorporating Priors For Medical Image Segmentation Using A Genetic Algorithm, Payel Ghosh, Melanie Mitchell, James A. Tanyi, Arthur Y. Hung

Computer Science Faculty Publications and Presentations

Medical image segmentation is typically performed manually by a physician to delineate gross tumor volumes for treatment planning and diagnosis. Manual segmentation is performed by medical experts using prior knowledge of organ shapes and locations but is prone to reader subjectivity and inconsistency. Automating the process is challenging due to poor tissue contrast and ill-defined organ/tissue boundaries in medical images. This paper presents a genetic algorithm for combining representations of learned information such as known shapes, regional properties and relative position of objects into a single framework to perform automated three-dimensional segmentation. The algorithm has been tested for prostate segmentation …

Resolving “Mixed” Privacy Signals Untangling The Anchoring And Adjustment In The Presence Of Multiple Signals, Thong Pham, Mark Keith

Journal of Undergraduate Research

As the technologies enabling mobile and ubiquitous information rapidly evolve, so do the information privacy risks to consumers (Belanger and Crossler 2011; Pavlou 2011; Smith et al. 2011). Perceived privacy risk has been demonstrated to be a critical factor in both information disclosure intentions (Dinev and Hart 2006; Lowry et al. 2011; Xu et al. 2010) and behaviors (Keith et al. 2013; Lowry et al. 2011; Posey et al. 2010).

Changing The World Of Research As We Know It, Aaron Sainsbury, Thomas Meservy

Journal of Undergraduate Research

Research plays a vital role in the advancement of knowledge. In conjunction, feedback through idea exchange, peer reviews, and formal reviews play a vital role in every research project. With the current academic organizations in place, the impact of feedback is not fully realized because of the structure of how and when feedback is received. While collaborative communication among researchers is increasingly more reliant upon technology, there is little focus on the development and implementation of a technologybased collaboration scheme to support and sustain scientific idea exchanges among researchers.

Packet Inspection And Modification For Mobile Devices: Trustbase, Scott Heidbrink, Daniel Zappala

Journal of Undergraduate Research

While there is a long tradition of providing protection against attackers for desktop and laptop devices, there has been less work in the mobile space. A common tool used by antivirus software is to inspect all packets entering or leaving a computer, to check for viruses or other malware. There are currently no generalpurpose tools for Android devices that provide for packet inspection and modification. There are a few tools that allow for packet capturing on mobile devices, but they can only function on “rooted” devices and do not allow modification. Since most users do not “root” their devices, these …

Messageguard: A Secure Webmail System Coupling Security With Usability, Joshua Lowe, Kent Seamons

Journal of Undergraduate Research

While working on my undergraduate degree, I developed an interest for computer security and started working in the Internet Security Research Lab on campus. A PhD student who I had worked with before previously, had proposed a webmail system called MessageGuard as an ubiquitous web encryption extension. The idea behind the system is to be fully open sourced, very easy to use, and extremely secure. Not only was I able to help work on several aspects of this project with PHD, Master’s, and undergraduate students alike, but I was able to put in practice what I was learning in my …

Semantic Document Clustering Using A Similarity Graph, Lubomir Stanchev

Computer Science and Software Engineering

Document clustering addresses the problem of identifying groups of similar documents without human supervision. Unlike most existing solutions that perform document clustering based on keywords matching, we propose an algorithm that considers the meaning of the terms in the documents. For example, a document that contains the words "dog" and "cat" multiple times may be placed in the same category as a document that contains the word "pet" even if the two documents share only noise words in common. Our semantic clustering algorithm is based on a similarity graph that stores the degree of semantic relationship between terms (extracted from …

Performance Considerations Of Network Functions Virtualization Using Containers, Jason Anderson, Udit Agarwal, Hongda Li, Hongxin Hu, Craig Lowery, Amy W. Apon

Publications

The network performance of virtual machines plays a critical role in Network Functions Virtualization (NFV), and several technologies have been developed to address hardware-level virtualization shortcomings. Recent advances in operating system level virtualization and deployment platforms such as Docker have made containers an ideal candidate for high performance application encapsulation and deployment. However, Docker and other solutions typically use lower-performing networking mechanisms. In this paper, we explore the feasibility of using technologies designed to accelerate virtual machine networking with containers, in addition to quantifying the network performance of container-based VNFs compared to the state-of-the-art virtual machine solutions. Our results show …

Spanning Eulerian Subgraphs And Catlin’S Reduced Graphs, Wei-Guo Chen, Zhi-Hong Chen

Scholarship and Professional Work - LAS

A graph G is collapsible if for every even subset R ⊆ V (G), there is a spanning connected subgraph H_R of G whose set of odd degree vertices is R. A graph is reduced if it has no nontrivial collapsible subgraphs. Catlin [4] showed that the existence of spanning Eulerian subgraphs in a graph G can be determined by the reduced graph obtained from G by contracting all the collapsible subgraphs of G. In this paper, we present a result on 3-edge-connected reduced graphs of small orders. Then, we prove that a 3-edge-connected graph G of order n …

Cloud Computing – Benefitet Dhe Të Metat E Ruajtjes Së Shënimeve Në Cloud, Arian Muharremi

Theses and Dissertations

Ideja për një “rrjet kompjuterik gjithëpërfshirës” u paraqit në vitet e gjashtëdhjeta nga J.C.R. Licklider, i cili ishte përgjegjës për mundësimin e zhvillimit të ARPANET (Advanced Research Projects Agency Network) në vitin 1969. Vizioni i tij ishte që kushdo në botë të ishtë i lidhur dhe të ketë akses në shënime dhe programe kurdo dhe nga kudo.

Duke e pasur paraysh trendin e ritjes së Cloud Computing nëper tregjet botërore, ishte interesante të bëhej një hulumtim mbi atë se çfar është Cloud Computing, historikun, lojtarët më të mëdhenjë në këtë fushë, si dhe njohurinë mbi të në popullatën Kosovare.

Për …

Implementimi I Teknologjisë Rfid Në Biblioteka, Anita Dreshaj

Theses and Dissertations

Një bibliotekë është një institucion në rritje. Në të njëjtën kohë që rritën problemet që lidhen me mirëmbajtjen, rritën edhe problemet që lidhën me menagjimin e dokumenteve. Shkenctarët kanë ndihmuar gjithmonë në zgjidhjen e problemeve. Për të zgjidhur problemet e dokumenteve të organizimit në mënyrë me te saktë, ata na kanë dhënë skemat e klasifikimit. Për të zgjidhur problemet e gjetjes së dokumenteve dhe vendnodhjes se tyre, ata na ofruan mënyra të katalogimit dhe udhëzimet e duhura. Për të zgjidhur problemet e hapësirës dhe kohës, ata i kanë mësuar punonjësit e bibliotekave të digjitalizojnë dokumentet dhe ti ndajnë online. Për …

Privatësia Në Rfid, Hasim Kozmaqi

Theses and Dissertations

Radio Frequency Identification (RFID) është një teknologji e cila përdorë identifikimin automatik për produktet dhe shërbime.

Në ditët e sotme ku siguria e lëvizjes së informacionit dhe identifikimi luajnë një rol tërëndësishëm dhevazhdimësi në rritje . Teknologjia e radio frekuencave ofron një potencial tëjashtëzakonshëm për tregune sotëm , pasi kostoja e implementimit të teknologjisë së RFIDpo ulën nëmënyrë konstante,çdo ditë paraqitet nevoja për aplikacione të reja.Akronimi i referohet pajisjeve të vogla elektronike që përbëhen nga një chip i vogël dhe një antenë.Chipi zakonisht është i aftë të mbante 2000 bytes të të dhënave ose më pak.Pajisja RFID i shërben tënjëjtit …

Shtresa Fizike Dhe Data Link Shtresa Në Teknologjitë E Qasjes, Kushtrim Ilazi

Theses and Dissertations

Interneti në ditët e sotme është bërë nevojë për çdo njeri, teknologjia e komunikimit është duke avancuar çdo ditë, nevoja për internet po rritet gjithnjë e më shumë. Implementimi i tij ne rrjetat rezidenciale është një sfidë për ofruesit e internetit për mënyrat se si mund të arrijnë deri tek shfrytëzuesit, çfarë teknologji duhet të përdoren apo cila është më e përshtatshme në raste të caktuara.

Teknologjitë të cilat përdorën në rrjetat rezidenciale si p.sh. teknologjia ADSL apo teknologjia tjetër WiMAX ose teknologji tjetër si Fibër , të gjitha këto i kanë përparësitë e tyre mirëpo edhe i kanë mangësitë …

Trendi I Rritjes Së Pagesave Online Në Kosovë, Liridon Ismajli

Theses and Dissertations

Dyqanet virtuale nga shtete të ndryshme të botës tashmë njihen edhe nga shumë kosovarë. Një pagesë online do të thotë që pagesa për një shërbim apo blerje të ndryshme do të kryhet me anë të përdorimit të aplikacioneve të ndryshme në web përmes llogarisë bankare. Një prej zhvillimeve më të mëdha që kanë prekur mënyrën e pagesave online viteve të fundit, është zhvillimi i aplikacioneve të ndryshme në web, të cilat mundësojnë që pagesat për shitjen apo blerjen e produkteve të ndryshme të kryhen online me anë të kartelave bankare. Blerjet online të japin më shumë mundësi për gjetjen e …

Implementimi I Cms Sistemit Me Teknologjin Php Për Menagjimin E Postimeve, Kushtrim Klinaku

Theses and Dissertations

Në ditët e sotit roli i internetit në jetën tonë është shumë i rëndësishum,sot pothuajse nuk ka shtëpi pa qasje aktive ne internet dhe roli i internetit është duke u bër secilen her më i madhë.

Ne kuader të keti zhvillimi është parqite edhe nevoja që subjekte te ndyshme të kenë nevoj të jenë “online” si bisnese apo subjekte tjera me veprimtari të ndryshme.Pra edhe rëndesia e veb faqeve është vazhdimisht në rritje.

Në këtë dokument ne kemi paraqite zhvillimin e një veb faqe duke filluar me historikun e faqeve dinamike,përshkrimin e gjuhëve programuese,dhe metodologjine e zhvillimit.

Duke vazhduar edhe …

Mospërputhja E Bazës Së Të Dhënave Relacionare Me Programimin E Orientuar Në Objekte Dhe Pasqyrimi Relacionar I Objekteve Si Zgjidhje, Sokol Deçani

Theses and Dissertations

Bazat e të dhënave relacionale janë bërë një standard për ruajtjen e të dhënave. Në anën tjetër, programimi i orientuar në objekte gjithashtu gjithnjë e më shumë po zbatohet në zhvillimin aplikacioneve moderne. Një bazë e të dhënave relacionare është e bazuar në modelin relacionar ku të dhënat janë të vendosura në tabelë (relacion në modelin relacionar) në rreshta dhe kolona. Rreshtat në tabelë janë të veçuara nga njëra-tjetra me nga një vlerë unike, duke shfrytëzuar këto vlera unike bëhen lidhje në mes rreshtave të tabeleve të ndryshme duke formuar relacion apo lidhje në mes tyre, kurse gjuhët e programimit …

Krahasimi I Burpsuite Dhe Zed Attack Proxy Në Sigurinë E Asp.Net Ueb Aplikacioneve, Shpëtim Hoxha

Theses and Dissertations

Ueb Aplikacionet vuajnë më shumë se pjesën e tyre të sulmeve të sigurisë. Këtu është arsyeja pse. Faqet e internetit dhe aplikacionet që ekzistojnë në to janë në një kuptim dera virtuale të gjitha korporatave dhe organizatave. Rritja e uebit që nga viti 1993 ka qenë befasues, duke lënë pas edhe televizionin dhe energjinë elektrike në shpejtësinë e hapjes së gjerë. Ueb aplikacionet janë duke luajtur një rol në rritje dhe gjithnjë e më të rëndësishme ne zhvillimin e softuerit. Në fakt, ekspertët aktualisht kanë hyrë në epokën e Web 3.0. Problemi është se siguria sinqesisht nuk e ka mbajtur …

Dallimi Në Mes Drupal Dhe Magento Në E-Commerce, Visar Ibishi

Theses and Dissertations

E-Commerce është proces i të bërit biznes përmes kompjuterit dhe internetit. Çdo person përmes një kompjuteri mund ti vizitojë faqet e caktuara për të bërë shitblerje të produkteve. Tregtia elektronike ka bërë lehtësime të mëdha duke zvogëluar punën fizike dhe kohën, për dallim nga tregtia tradicionale ku njerëzit janë dashur që fizikisht të shkojnë për të blerë produkte. Që nga viti 1990 zhvillimi i tregtisë elektronike ka marrë hov të madh. Por siguria është një dukuri e cila ka penguar një zhvillim edhe më të madh të këtij lloji të biznesit. Siguria është sot sfida kryesore e tregtisë elektronike dhe …

Ranking Of High-Value Social Audiences On Twitter, Siaw Ling Lo, Raymond Chiong, David Cornforth

Research Collection School Of Computing and Information Systems

Even though social media offers plenty of business opportunities, for a company to identify the right audience from the massive amount of social media data is highly challenging given finite resources and marketing budgets. In this paper, we present a ranking mechanism that is capable of identifying the top-k social audience members on Twitter based on an index. Data from three different Twitter business account owners were used in our experiments to validate this ranking mechanism. The results show that the index developed using a combination of semi-supervised and supervised learning methods is indeed generic enough to retrieve relevant audience …

Random Field Disorder At An Absorbing State Transition In One And Two Dimensions, Hatem Barghathi, Thomas Vojta

Physics Faculty Research & Creative Works

We investigate the behavior of nonequilibrium phase transitions under the influence of disorder that locally breaks the symmetry between two symmetrical macroscopic absorbing states. In equilibrium systems such "random-field" disorder destroys the phase transition in low dimensions by preventing spontaneous symmetry breaking. In contrast, we show here that random-field disorder fails to destroy the nonequilibrium phase transition of the one- and two-dimensional generalized contact process. Instead, it modifies the dynamics in the symmetry-broken phase. Specifically, the dynamics in the one-dimensional case is described by a Sinai walk of the domain walls between two different absorbing states. In the two-dimensional case, …

Histogram Of Oriented Phase And Gradient (Hopg) Descriptor For Improved Pedestrian Detection, Hussin Ragb, Vijayan K. Asari

Electrical and Computer Engineering Faculty Publications

This paper presents a new pedestrian detection descriptor named Histogram of Oriented Phase and Gradient (HOPG) based on a combination of the Histogram of Oriented Phase (HOP) features and the Histogram of Oriented Gradient features (HOG).

The proposed descriptor extracts the image information using both the gradient and phase congruency concepts. Although the HOG based method has been widely used in the human detection systems, it lacks to deal effectively with the images impacted by the illumination variations and cluttered background. By fusing HOP and HOG features, more structural information can be identified and localized in order to obtain more …

Calculated Vibrational States Of Ozone Up To Dissociation, Steve Alexandre Ndengué, Richard Dawes, Xiaogang Wang, Tucker Carrington Jr., Zhigang Sun, Hua Guo

Chemistry Faculty Research & Creative Works

A new accurate global potential energy surface for the ground electronic state of ozone [R. Dawes et al., J. Chem. Phys. 139, 201103 (2013)] was published fairly recently. The topography near dissociation differs significantly from previous surfaces, without spurious submerged reefs and corresponding van der Waals wells. This has enabled significantly improved descriptions of scattering processes, capturing the negative temperature dependence and large kinetic isotope effects in exchange reaction rates. The exchange reactivity was found to depend on the character of near-threshold resonances and their overlap with reactant and product wavefunctions, which in turn are sensitive to the potential. Here …

Wanda: Securely Introducing Mobile Devices (Extended Version), Timothy J. Pierson, Xiaohui Liang, Ronald Peterson, David Kotz

Computer Science Technical Reports

Nearly every setting is increasingly populated with wireless and mobile devices -- whether appliances in a home, medical devices in a health clinic, sensors in an industrial setting, or devices in an office or school. There are three fundamental operations when bringing a new device into any of these settings: (1) to configure the device to join the wireless local-area network, (2) to partner the device with other nearby devices so they can work together, and (3) to configure the device so it connects to the relevant individual or organizational account in the cloud. The challenge is to accomplish all …

Hpcnmf: A High-Performance Toolbox For Non-Negative Matrix Factorization, Karthik Devarajan, Guoli Wang

COBRA Preprint Series

Non-negative matrix factorization (NMF) is a widely used machine learning algorithm for dimension reduction of large-scale data. It has found successful applications in a variety of fields such as computational biology, neuroscience, natural language processing, information retrieval, image processing and speech recognition. In bioinformatics, for example, it has been used to extract patterns and profiles from genomic and text-mining data as well as in protein sequence and structure analysis. While the scientific performance of NMF is very promising in dealing with high dimensional data sets and complex data structures, its computational cost is high and sometimes could be critical for …

Large-Scale Spatial Data Management On Modern Parallel And Distributed Platforms, Simin You

Dissertations, Theses, and Capstone Projects

Rapidly growing volume of spatial data has made it desirable to develop efficient techniques for managing large-scale spatial data. Traditional spatial data management techniques cannot meet requirements of efficiency and scalability for large-scale spatial data processing. In this dissertation, we have developed new data-parallel designs for large-scale spatial data management that can better utilize modern inexpensive commodity parallel and distributed platforms, including multi-core CPUs, many-core GPUs and computer clusters, to achieve both efficiency and scalability. After introducing background on spatial data management and modern parallel and distributed systems, we present our parallel designs for spatial indexing and spatial join query …