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Articles 1621 - 1650 of 2733
Full-Text Articles in Computer Sciences
Ophthalmology Product Sale And Management System (Opsms), Qëndresa Hajdari
Ophthalmology Product Sale And Management System (Opsms), Qëndresa Hajdari
Theses and Dissertations
Një ndër konceptet themelore në zhvillimin e zgjidhjeve të sotme është gjithashtu aplikacioni për menaxhim te punëve pa të cilën do të jetë shumë e vështirë zgjidhja e disa problemeve ku do të kishim të bënim me më shumë të dhëna, apo zgjidhjet që janë shumë të komplikuara në menaxhimin dhe organizimin e atyre të dhënave. Këto zgjidhje na bëjnë të mendojmë në rrethinën e menaxhimit të këtyre aplikacioneve. Të gjitha kodimet dhe energjia që shpenzohet në drejtim të zhvillimit efikas të aplikacioneve, do të ishin të parëndësishëm nëse shfrytëzuesit nuk do të ishin në gjendje të qaseshin me efikasitet …
Modeling And Design Of Entity Identity Information In Entity Resolution Systems, Yinle Zhou
Modeling And Design Of Entity Identity Information In Entity Resolution Systems, Yinle Zhou
Theses and Dissertations
This dissertation describes and defines a new area of research called entity identity information management (EIIM) and shows that it is an extension and further elaboration of the Stanford Entity Resolution Framework (SERF). EIIM is defined as the collection and management of identity information with the goal of sustaining entity identity integrity, a fundamental data quality requirement for master data. Following the design science research methodology, the dissertation includes a formal mathematical model for describing EIIM. It also includes a discussion of how EIIM design choices affect the implementation of EIIM systems in terms of system efficiency and effectiveness. In …
Technique And Cue Selection For Graphical Presentation Of Generic Hyperdimensional Data, Lee Mont Howard
Technique And Cue Selection For Graphical Presentation Of Generic Hyperdimensional Data, Lee Mont Howard
Theses and Dissertations
The process of visualizing n-D data presents the user with four problems: finding a hyperdimensional graphics package capable of rendering n-D data, finding a suitable presentation technique supported by the package that allows insight to be gained, using the provided user interface to interact with the presentation technique to explore the information in the data, and finding a way to share the information gained with others. Many graphics packages have been written to solve the first problem. However, existing packages do not sufficiently solve the other three problems. A hyperdimensional graphics package that sufficiently solves all these problems simplifies the …
The ∑Iq Methodology: An Information Quality Perspective On Oil Data, Yusuf Yiliyasi
The ∑Iq Methodology: An Information Quality Perspective On Oil Data, Yusuf Yiliyasi
Theses and Dissertations
Information quality (IQ) theories and frameworks have been increasingly studied and applied in various organizations to assess, improve and monitor the quality of their information products. Yet information quality problems remain pervasive in many organizations, industries and government institutions. For example various governmental as well as non-governmental organizations, institutions, and companies collect, compile and distribute information products in order to satisfy the needs of information consumers in the energy industry. What are the qualities of their information products? How do they collect or disseminate their data products? Why do information quality problems exist and how are the problems created? How …
Automated Content-Based Video Analysis And Management, Engin Mendi
Automated Content-Based Video Analysis And Management, Engin Mendi
Theses and Dissertations
Rapid expansion in the use of digital videos as an information source has led to a significant increase in the availability and the amount of video data. Multimedia applications use and generate large volume of complex video data sets. Since manual indexing, searching, browsing, and retrieval of relevant information are both computationally expensive and time consuming, efficient and reasonable mechanisms that can perform these operations are needed. This dissertation sorts out the challenges of video processing for automated content-based video analysis and management. More specifically, the work presented here include temporal video segmentation to partition video sequences into shots, extracting …
Analysis And Design Tools For Structured Feedback Systems, Anurag Rai
Analysis And Design Tools For Structured Feedback Systems, Anurag Rai
Theses and Dissertations
As we begin to analyze and construct extremely complex systems, a theory for understanding and designing the underlying architecture becomes very important. To move in the direction of a precise theory of architecture, this thesis will provide some concrete tools to analyze and design complex systems with a given network structure. The first main result of this thesis analyzes the vulnerability of a system and shows that a system's vulnerability depends on its network structure. We will consider destabilization attacks acting on a single link in a system's logical interconnection structure. The concept of a vulnerable link is characterized and …
Decentralized Riemannian Particle Filtering With Applications To Multi-Agent Localization, Martin J. Eilders
Decentralized Riemannian Particle Filtering With Applications To Multi-Agent Localization, Martin J. Eilders
Theses and Dissertations
The primary focus of this research is to develop consistent nonlinear decentralized particle filtering approaches to the problem of multiple agent localization. A key aspect in our development is the use of Riemannian geometry to exploit the inherently non-Euclidean characteristics that are typical when considering multiple agent localization scenarios. A decentralized formulation is considered due to the practical advantages it provides over centralized fusion architectures. Inspiration is taken from the relatively new field of information geometry and the more established research field of computer vision. Differential geometric tools such as manifolds, geodesics, tangent spaces, exponential, and logarithmic mappings are used …
The White-Hat Bot: A Novel Botnet Defense Strategy, Tyrone C. Gubler
The White-Hat Bot: A Novel Botnet Defense Strategy, Tyrone C. Gubler
Theses and Dissertations
Botnets are a threat to computer systems and users around the world. Botmasters can range from annoying spam email propagators to nefarious criminals. These criminals attempt to take down networks or web servers through distributed denial-of-service attacks, to steal corporate secrets, or to launder money from individuals or corporations. As the number and severity of successful botnet attacks rise, computer security experts need to develop better early-detection and removal techniques to protect computer networks and individual computer users from these very real threats. I will define botnets and describe some of their common purposes and current uses. Next, I will …
Forensic Memory Analysis For Apple Os X, Andrew F. Hay
Forensic Memory Analysis For Apple Os X, Andrew F. Hay
Theses and Dissertations
Analysis of raw memory dumps has become a critical capability in digital forensics because it gives insight into the state of a system that cannot be fully represented through traditional disk analysis. Interest in memory forensics has grown steadily in recent years, with a focus on the Microsoft Windows operating systems. However, similar capabilities for Linux and Apple OS X have lagged by comparison. The volafox open source project has begun work on structured memory analysis for OS X. The tool currently supports a limited set of kernel structures to parse hardware information, system build number, process listing, loaded kernel …
Enhancing Trust In The Smart Grid By Applying A Modified Exponentially Weighted Averages Algorithm, Andrew T. Kasperek
Enhancing Trust In The Smart Grid By Applying A Modified Exponentially Weighted Averages Algorithm, Andrew T. Kasperek
Theses and Dissertations
The main contribution of this thesis is the development and application of a modified Exponentially Weighted Moving Algorithm (EWMA) algorithm, and its ability to robustly function in the face varying numbers of bad (malicious or malfunctioning) Special Protection System (SPS) nodes. Simulation results support the use of the proposed modified EWMA reputation based trust module in SPSs within a smart grid environment. This modification results in the ability to easily maintain the system above the minimum acceptable frequency of 58.8 Hz at the 95% confidence interval, when challenged with test cases containing 5, 10 and 15 bad node test cases …
Process Flow Features As A Host-Based Event Knowledge Representation, Benhur E. Pacer
Process Flow Features As A Host-Based Event Knowledge Representation, Benhur E. Pacer
Theses and Dissertations
The detection of malware is of great importance but even non-malicious software can be used for malicious purposes. Monitoring processes and their associated information can characterize normal behavior and help identify malicious processes or malicious use of normal process by measuring deviations from the learned baseline. This exploratory research describes a novel host feature generation process that calculates statistics of an executing process during a window of time called a process flow. Process flows are calculated from key process data structures extracted from computer memory using virtual machine introspection. Each flow cluster generated using k-means of the flow features represents …
Vulnerability Analysis Of The Player Command And Control Protocol, John T. Hagen
Vulnerability Analysis Of The Player Command And Control Protocol, John T. Hagen
Theses and Dissertations
The Player project is an open-source effort providing a control interface specification and software framework for abstracting robot hardware. This research presents five exploits that compromise vulnerabilities in Player's command and control protocol. The attacks exploit weaknesses in the ARP, IP, TCP and Player protocols to compromise the confidentially, integrity, and availability of communication between a Player client and server. The attacks assume a laptop is connected in promiscuous mode to the same Ethernet hub as the client and server in order to sniff all network traffic between them. This work also demonstrates that Internet Protocol Security (IPsec) is capable …
Resource Provisioning In Large-Scale Self-Organizing Distributed Systems, M. Brent Reynolds
Resource Provisioning In Large-Scale Self-Organizing Distributed Systems, M. Brent Reynolds
Theses and Dissertations
This dissertation researches the mathematical translation of resource provisioning policy into mathematical terms and parameters to solve the on-line service placement problem. A norm called the Provisioning Norm is introduced. Theorems presented in the work show the Provisioning Norm utility function and greedy, random, local search effectively and efficiently solve the on-line problem. Caching of placements is shown to reduce the cost of change but does not improve response time performance. The use of feedback control theory is shown to be effective at significantly improving performance but increases the cost of change. The theoretical results are verified using a decentralized, …
Humbjet E Sinjalit Në Kabllin Optik , Teknologjia Wdm Dhe Dwdm Në Rrjetat Optike Backbone, Arben Sylejmani
Humbjet E Sinjalit Në Kabllin Optik , Teknologjia Wdm Dhe Dwdm Në Rrjetat Optike Backbone, Arben Sylejmani
Theses and Dissertations
Rrjetat optike janë bërë linja kryesore (backbone) në rrjetat telekomunikuese nacionale dhe internacionale. Rritja e kërkesave për shfrytëzimin më të madh të kapaciteteve të internetit ka bërë që sot shumë kompani të ndryshme të telekomunikacionit t’i kushtojnë rëndësi të madhe linjave kryesore (backbone) që kryesisht ndërtohen me kanale kabllore nëntokësore në të cilat vendosen mediumet (kabllot optike) me mundësi të kapaciteteve të larta të transferimit të të dhënave. Linjat kryesore backbone të cilat kanë për qëllim lidhjen ndërkombëtare në mes dy shteteve apo dy kontinenteve përdorin teknologjinë e avancuar WDM dhe DWDM për të shfrytëzuar sa më shumë hapësirën e …
Web Sherbimet, Ismajl Dragobuzhda
Web Sherbimet, Ismajl Dragobuzhda
Theses and Dissertations
Ueb shërbimet (Web Services) janë një teknologji e re që mundësojnë qasjen e funksioneve në largësi përmes internetit. Ueb shërbimet janë aplikacione kyçe në komunikimin e bizneseve me biznese (B2B) dhe biznesit me konsumator (B2C). Ueb shërbimet janë të bazuara në një bashkësi XML-standardesh, të cilat janë WSDL (Web Services Descritpion Language), SOAP (Simple Objekt Access Protocol) si dhe UDDI (Universal Descripption, Discovery and Integration). Përmes këtyre standardeve ueb shërbimet mundësojnë që nga një Windows klient ti qasemi një funksioni në largësi, i cili ofrohet nga një sistem në Linux dhe anasjelltas. Komunikimi në mes të shfrytëzuesit të ueb shërbimit …
Principet Fundamentale Të Projektimit Të Rrjetave Kompjuterike Për Fsk, Naser Ramadani
Principet Fundamentale Të Projektimit Të Rrjetave Kompjuterike Për Fsk, Naser Ramadani
Theses and Dissertations
Ky dokument përshkruan mënyrën e preferuar të projektimit të rrjetave LAN bazuar në principet fundamentale – standardet e aprovuara ndërkombëtarisht , duke përfshirë përshkrimet e topologjive, protokoleve të routimit, mënyrën e shtrirjes së rrjetave dhe shumë gjëra të tjera të rëndësishme për rrjeta. Rrjetat projektohen sipas Enterpise Composite Network Model me redundant në çdo pjesë për të arritur një disponueshmëri të kënaqshme. Në këtë mënyrë rrjetet janë skalabile dhe lehtë është ndërtimi i tyre dhe shtimi i funksioneve të reja më vonë (VoIP, Rrjeta pa tela, e tjerë). Punimi përshkruan hulumtimet shkencore në lidhje me principet fundamentale të projektimit të …
Komunikimi I Paisjeve Mobile, Riad Maliqi
Komunikimi I Paisjeve Mobile, Riad Maliqi
Theses and Dissertations
Ueb shërbimet mundësojnë ekzekutimin e funksioneve në largësi përmes internetit. Ueb shërbimet sigurojnë platformë të pavarur nga gjuhët programuese dhe lidhin aplikacionet e organizatave dhe ndërmarrjeve të ndryshme përmes rrjetës (internetit). Qasja në internet nga pajisjet mobile është bërë e nevojshme për shumë biznese dhe aktivitete të ndryshme profesionale. Shumë kompani dhe organizata të ndryshme kanë ueb faqe dhe ueb shërbime të publikuara në internet për komunikim me klientët e tyre që mund të jenë nga cila do anë e botës. Këto ueb faqe dhe ueb shërbime, kryesisht janë zhvilluar për t’ju qasur nga kompjuterët, kurse sot është e nevojshme …
Short Message Service (Sms) Command And Control (C2) Awareness In Android-Based Smartphones Using Kernel-Level Auditing, Robert J. Olipane
Short Message Service (Sms) Command And Control (C2) Awareness In Android-Based Smartphones Using Kernel-Level Auditing, Robert J. Olipane
Theses and Dissertations
This thesis addresses the emerging threat of botnets in the smartphone domain and focuses on the Android platform and botnets using short message service (SMS) as the command and control (C2) channel. With any botnet, C2 is the most important component contributing to its overall resilience, stealthiness, and effectiveness. This thesis develops a passive host-based approach for identifying covert SMS traffic and providing awareness to the user. Modifying the kernel and implementing this awareness mechanism is achieved by developing and inserting a loadable kernel module that logs all inbound SMS messages as they are sent from the baseband radio to …
Authorship Is Continuous: Detecting Plagiarism In Student Code Assignments With Version Control, Ian Mathias Koss
Authorship Is Continuous: Detecting Plagiarism In Student Code Assignments With Version Control, Ian Mathias Koss
Theses and Dissertations
In academia, the conflict between plagiarist and instructor is reaching a crescendo. The increasing availability of source material available from the Internet, either for free or for hire, is met by the increasing sophistication of tools that help with the detection of these activities. These plagiarism detection tools work by comparing sets of documents to identify similar passages of text, but this approach has some inherent limitations. Chief among these is the single source problem. If a student hires someone to write a term paper for him or her, clearly plagiarism has taken place. However, there is no second copy …
Advancing The Effectiveness Of Non-Linear Dimensionality Reduction Techniques, Michael S. Gashler
Advancing The Effectiveness Of Non-Linear Dimensionality Reduction Techniques, Michael S. Gashler
Theses and Dissertations
Data that is represented with high dimensionality presents a computational complexity challenge for many existing algorithms. Limiting dimensionality by discarding attributes is sometimes a poor solution to this problem because significant high-level concepts may be encoded in the data across many or all of the attributes. Non-linear dimensionality reduction (NLDR) techniques have been successful with many problems at minimizing dimensionality while preserving intrinsic high-level concepts that are encoded with varying combinations of attributes. Unfortunately, many challenges remain with existing NLDR techniques, including excessive computational requirements, an inability to benefit from prior knowledge, and an inability to handle certain difficult conditions …
Improving The Effectiveness Of Machine-Assisted Annotation, Paul L. Felt
Improving The Effectiveness Of Machine-Assisted Annotation, Paul L. Felt
Theses and Dissertations
Annotated textual corpora are an essential language resource, facilitating manual search and discovery as well as supporting supervised Natural Language Processing (NLP) techniques designed to accomplishing a variety of useful tasks. However, manual annotation of large textual corpora can be cost-prohibitive, especially for rare and under-resourced languages. For this reason, developers of annotated corpora often attempt to reduce annotation cost by offering annotators various forms of machine assistance intended to increase annotator speed and accuracy. This thesis contributes to the field of annotated corpus development by providing tools and methodologies for empirically evaluating the effectiveness of machine assistance techniques. This …
Towards An Incentive Compatible Framework Of Secure Cloud Computing, Yulong Zhang
Towards An Incentive Compatible Framework Of Secure Cloud Computing, Yulong Zhang
Theses and Dissertations
Cloud computing has changed how services are provided and supported through the computing infrastructure. It has the advantages such as flexibility , scalability , compatibility and availability . However, the current architecture design also brings in some troublesome problems, like the balance of cooperation benefits and privacy concerns between the cloud provider and the cloud users, and the balance of cooperation benefits and free-rider concerns between different cloud users. Theses two problems together form the incentive problem in cloud environment. The first conflict lies between the reliance of services and the concerns of secrets of cloud users. To solve it, …
Fast Neural Network Algorithm For Solving Classification Tasks, Noor Albarakati
Fast Neural Network Algorithm For Solving Classification Tasks, Noor Albarakati
Theses and Dissertations
Classification is one-out-of several applications in the neural network (NN) world. Multilayer perceptron (MLP) is the common neural network architecture which is used for classification tasks. It is famous for its error back propagation (EBP) algorithm, which opened the new way for solving classification problems given a set of empirical data. In the thesis, we performed experiments by using three different NN structures in order to find the best MLP neural network structure for performing the nonlinear classification of multiclass data sets. A developed learning algorithm used here is the batch EBP algorithm which uses all the data as a …
Design And Construction Of An Entity Resolution System That Supports Entity Identity Information Management And Asserted Resolution, Eric D. Nelson
Design And Construction Of An Entity Resolution System That Supports Entity Identity Information Management And Asserted Resolution, Eric D. Nelson
Theses and Dissertations
This work describes the design and construction of an open source, entity resolution system that enables users to assign and maintain persistent identifiers for master data items. Two key features of this system that are not available in current ER systems and that make persistent identification possible are (1) The capture and management of entity identity information (2) Support for user-directed asserted resolution to complement automated direct matching and transitive closure Another important feature of the design is that the system can be easily configured at run-time into any one of four types of entity resolution architectures including * Traditional …
Contributions To K-Means Clustering And Regression Via Classification Algorithms, Raied Salman
Contributions To K-Means Clustering And Regression Via Classification Algorithms, Raied Salman
Theses and Dissertations
The dissertation deals with clustering algorithms and transforming regression prob-lems into classification problems. The main contributions of the dissertation are twofold; first, to improve (speed up) the clustering algorithms and second, to develop a strict learn-ing environment for solving regression problems as classification tasks by using support vector machines (SVMs). An extension to the most popular unsupervised clustering meth-od, k-means algorithm, is proposed, dubbed k-means2 (k-means squared) algorithm, appli-cable to ultra large datasets. The main idea is based on using a small portion of the dataset in the first stage of the clustering. Thus, the centers of such a smaller …
Performance Evaluation Of Optimal Rate Allocation Models For Wireless Networks, Ryan Michael Padilla
Performance Evaluation Of Optimal Rate Allocation Models For Wireless Networks, Ryan Michael Padilla
Theses and Dissertations
Convex programming is used in wireless networks to optimize the sending or receiving rates of links or flows in a network. This kind of optimization problem is formulated into a rate allocation problem, where each node in the network will distributively solve the convex problem and all links or flows will converge to their optimal rate. The objective function and constraints of these problems are represented in a simplified model of contention, interference, and sending or receiving rates. The Partial Interference model is an optimal rate allocation model for use in wireless mesh networks that has been shown to be …
Automated Fingertip Detection, Joseph G. Butler
Automated Fingertip Detection, Joseph G. Butler
Theses and Dissertations
One of the oldest biometrics that has been used to uniquely identify a person is their fingerprint. Recent developments in research on fingerprint collection have made it possible to collect fingerprint data from a stand-off digital image. Each of the techniques developed so far have relied on either a very controlled capture environment to ensure only a single fingertip is collected or manual cropping of the image down to the fingertip. The main body of the research focuses on extracting the fingerprint itself. If fingerprint collection via digital image is ever to be fielded in the real world on such …
Wifu Transport: A User-Level Protocol Framework, Randall Jay Buck
Wifu Transport: A User-Level Protocol Framework, Randall Jay Buck
Theses and Dissertations
It is well known that the transport layer protocol TCP has low throughput and is unfair in wireless mesh networks. Transport layer solutions for mesh networks have been primarily validated using simulations with simplified assumptions about the wireless network. The WiFu Transport framework complements simulator results by allowing developers to easily create and experiment with transport layer protocols on live networks. We provide a user-space solution that is flexible and promotes code reuse while maintaining high performance and scalability. To validate WiFu Transport we use it to build WiFu TCP, a decomposed Tahoe solution that preserves TCP semantics. Furthermore, we …
Security Standards And Best Practice Considerations For Quantum Key Distribution (Qkd), Carole A. Harper
Security Standards And Best Practice Considerations For Quantum Key Distribution (Qkd), Carole A. Harper
Theses and Dissertations
Quantum Key Distribution (QKD) systems combine cryptographic primitives with quantum information theory to produce a theoretic unconditionally secure cryptographic key. However, real-world implementations of QKD systems are far from ideal and differ significantly from the theoretic model. Because of this, real-world QKD systems require additional practical considerations when implemented to achieve secure operations. In this thesis, a content analysis of the published literature is conducted to determine if established security and cryptographic standards and best practices are addressed in real world, practical QKD implementations. The research reveals that most published, real world QKD implementations do not take advantage of established …
Analysis Of The Impact Of Data Normalization On Cyber Event Correlation Query Performance, Smile T. Ludovice
Analysis Of The Impact Of Data Normalization On Cyber Event Correlation Query Performance, Smile T. Ludovice
Theses and Dissertations
A critical capability required in the operation of cyberspace is the ability to maintain situational awareness of the status of the infrastructure elements that constitute cyberspace. Event logs from cyber devices can yield significant information, and when properly utilized they can provide timely situational awareness about the state of the cyber infrastructure. In addition, proper Information Assurance requires the validation and verification of the integrity of results generated by a commercial log analysis tool. Event log analysis can be performed using relational databases. To enhance database query performance, previous literatures affirm denormalization of databases. Yet database normalization can also increase …