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Articles 541 - 570 of 666
Full-Text Articles in Computer Sciences
Computational Analysis Of Structure And Function Of Genomic Sequences, Abanish Singh
Computational Analysis Of Structure And Function Of Genomic Sequences, Abanish Singh
Computer Science and Engineering Dissertations - Archive
The genetic code consists of long chains of deoxyribonucleic acid (DNA) present in every cell of a living organism. These chains contain both functional and non-functional DNA sequences, and their proportion in the mix varies widely along the tree of life. Generally, more complex organisms tend to feature large amounts of "junk" DNA, whose importance is still subject of a debate in the scientific circles. The functional sequences include coding sequences (genes) and various types of signals, mostly, but not exclusively, controlling the regulation of coding sequences, i.e. activating and deactivating the expression of genes, during the developmental stage, in …
Helmholtz's Theorem Based Parametric Non-Rigid Image Registration, Hsi-Yue S. Hsiao
Helmholtz's Theorem Based Parametric Non-Rigid Image Registration, Hsi-Yue S. Hsiao
Computer Science and Engineering Dissertations - Archive
Helmholtz's theorem states that, with suitable boundary condition, a vector field is completely determined if both of its divergence and curl are specified everywhere. Based on this, we developed a new parametric non-rigid image registration algorithm. Instead of the displacements of regular control grid points, the curl and divergence at each grid point are employed as the parameters. This leads to a very simple mathematical model - two Poisson equations in 2-D or three Poisson equations in 3-D which will be used to solve for the displacement field. The similarity measure is sum of squared difference. And multi-resolution is applied …
A Particle Filter Based Framework For Indoor Wireless Localization Using Custom Ieee 802.15.4 Nodes, Vijay Vasant Dixit
A Particle Filter Based Framework For Indoor Wireless Localization Using Custom Ieee 802.15.4 Nodes, Vijay Vasant Dixit
Computer Science and Engineering Theses - Archive
Locating people and objects as soon as possible and fair amount of precision has always been an important part of any organization or industry, especially in manufacturing, healthcare, and logistics. Systems that now have the ability to locate objects or people are called Real Time Location Systems (RTLS). They typically use small low-power transmitters called tags attached to assets (or worn by people) as well as sets of readers that map the location of these tags. Systems that map the longitude and attitude of an object are geo-location systems and generally use GPS for location mapping. Systems that map a …
Dynacet: A Minimum-Effort Driven Dynamic Faceted Search System Over Structured Databases, Haidong Wang
Dynacet: A Minimum-Effort Driven Dynamic Faceted Search System Over Structured Databases, Haidong Wang
Computer Science and Engineering Theses - Archive
In this thesis, we propose minimum-effort driven navigational techniques for enterprise database systems based on the faceted search paradigm. Our proposed techniques dynamically suggest facets for drilling down into the database such that the cost of navigation is minimized. At every step, the system asks the user a question or a set of questions on different facets and depending on the user response, dynamically fetches the next most promising set of facets, and the process repeats. Facets are selected based on their ability to rapidly drill down to the most promising tuples, as well as on the ability of the …
Modeling And Simulation Of A General Motors Conveyor System Using A Custom Decision Optimizer, Mirza Mohammad Lutfe Elahi
Modeling And Simulation Of A General Motors Conveyor System Using A Custom Decision Optimizer, Mirza Mohammad Lutfe Elahi
Computer Science and Engineering Theses - Archive
The temporal behavior of conveyor systems can be modeled using discrete event (DE) simulations. DE modeling provides a quick and cost effective method for analyzing complex problems as different scenarios can be tested rapidly without affecting the day to day activities of production systems. A simulation model coupled with decision optimization on routing choices enables the evaluation of different decision strategies.In the General Motors paint shop at Arlington, Texas, the complex conveyor system moving cars to the paint booths has been observed to mix up same color batches of cars coming from the body shop. At the paint booth, every …
Use Of Wireless Signal Characteristics For Mobile Robotics Localization And Access Point Mapping, Joshua Davies
Use Of Wireless Signal Characteristics For Mobile Robotics Localization And Access Point Mapping, Joshua Davies
Computer Science and Engineering Theses - Archive
Mobile robotics is an interesting and challenging emerging field in computer science.To properly achieve true autonomy, a robot must be able to determine where it is in relationshipto a global frame of reference and it must be able to do so with a minimum of interaction fromhuman operators and impose as few constraints on its surroundings as possible. The uncertainnature of mobility and perception requires that advanced probabilistic inference techniques beapplied to minimize error. This work examines the applicability of radio-frequency signals to the mobile robotlocalization problem to localize quickly over a wide area. Particle filtering techniques areemployed to adjust …
Towards An Implementation Of Avoip: Anonymous Voice-Over-Ip, Bikas Raj Gurung
Towards An Implementation Of Avoip: Anonymous Voice-Over-Ip, Bikas Raj Gurung
Computer Science and Engineering Theses - Archive
Voice over IP (VoIP) is one of the fastest growing telecommunicaiton market today. However with great popularity comes greater security risk. When we communicate over the Internet we expose our identity to all the prying eyes, even if we do not want to. Even though VoIP data can be secured by using encryption, sometimes the relationships between users can be sensitive. To provide stronger privacy for these users, we propose anonymous VoIP (aVoIP) - a means to secure user privacy in VoIP. The biggest challenge in introducing anonymity to VoIP system is in providing acceptable Quality of Service (QoS). Users …
Temporal Potential Function Approach For Path Planning In Dynamic Environments, Vamsikrishna Gopikrishna
Temporal Potential Function Approach For Path Planning In Dynamic Environments, Vamsikrishna Gopikrishna
Computer Science and Engineering Theses - Archive
A Dynamic environment is one in which either the obstacles or the goal or both are in motion. In most of the current research, robots attempting to navigate in dynamic environments use reactive systems. Although reactive systems have the advantage of fast execution and low overheads, the tradeoff is in performance in terms of the path optimality. Often, the robot ends up tracking the goal, thus following the path taken by the goal, and deviates from this strategy only to avoid a collision with an obstacle it may encounter. In a path planner, the path from the start to the …
Adapting Harmonic Function Path Planning: To Reflect User Motion Preferences, Giles John D'Silva
Adapting Harmonic Function Path Planning: To Reflect User Motion Preferences, Giles John D'Silva
Computer Science and Engineering Theses - Archive
Every human in the real world has a unique motion preference while moving to achieve a given task. These preferences could be expressed by moving in a straight line, following the wall along a corridor, avoiding sharp turns, preferring hard flat surfaces over damp uneven surfaces, choosing the shortest path to the goal or by giving a high priority towards safety by maintaining a definite distance from obstacles. To automatically incorporate user preferences into motion planning we could extract the trajectories taken by the user to achieve a task in a given local vironment and attempt to use them in …
Stochastic Models For In-Silico Event-Based Biological Network Simulation, Preetam Ghosh
Stochastic Models For In-Silico Event-Based Biological Network Simulation, Preetam Ghosh
Computer Science and Engineering Dissertations - Archive
The multi-scale biological system model is a new research direction to capture the dynamic measurements of complex biological systems. The current statistical thermodynamic models can not scale to this challenge due to the explosion of state-spaces of the system, where a biological organ may have billions of cells, each with millions of molecule types and each type may have a few million molecules. We seek to propose a phenomenological theory that will require a smaller number of state variables to address this multi-scaling problem. Discrete Markov statistical process is used to understand the system dynamics in the networking community for …
Learning Video Preferences Using Visual Features And Closed Captions, Darin Brezeale
Learning Video Preferences Using Visual Features And Closed Captions, Darin Brezeale
Computer Science and Engineering Dissertations - Archive
Viewers of video now have more choices than ever. As the number of choices increases, the task of searching through these choices to locate video of interest is becoming more difficult. Current methods for learning a viewer's preferences in order to automate the search process rely either on video having content descriptions or on having been rated by other viewers identified as being similar. However, much video exists that does not meet these requirements. To address this need, we use hidden Markov models to learn the preferences of a viewer by combining visual features and closed captions. We validate our …
Distributed Predictive Health Monitoring, Jorge David Herrera Gonzalez
Distributed Predictive Health Monitoring, Jorge David Herrera Gonzalez
Computer Science and Engineering Theses - Archive
According to the National Center for Health Statistics the major causes of death in the US are (per year) heart diseases with 654 thousand cases, followed by cancer with 550 thousand cases and stroke with 150 thousand cases. In this project we propose, design, implement and test a prototype of a system that promises to improve the level of detection and prediction of several diseases and improves the quality of life of patients by utilizing non-invasive wireless medical sensors. This system is composed of a set of wireless medical sensors, a nearby (close-proximity) PDA (personal digital accessory) or cell phone …
Cxlengine - A Comprehensive Xml Loosely Structured Search Engine, Indhu Krishna Sivaramakrishnan
Cxlengine - A Comprehensive Xml Loosely Structured Search Engine, Indhu Krishna Sivaramakrishnan
Computer Science and Engineering Theses - Archive
XML keyword search has been a widely researched area. [15] has proposed an XML semantic search engine called OOXSearch, which answers loosely structured queries. The framework of OOXSearch takes into account the semantic relationship between nodes based on their contexts. The context of a node is determined by its parent node. The label "name", for example, could mean the name of a book and could also mean the name of the book's author. If we try to consider the relationship between these two nodes without considering their parent nodes, we would be drawing the incorrect conclusion that these two nodes …
Limitations Of Ieee 802.15.4 Based Wireless Mesh Networks For Wireless Localization, William Anthony Wallace
Limitations Of Ieee 802.15.4 Based Wireless Mesh Networks For Wireless Localization, William Anthony Wallace
Computer Science and Engineering Theses - Archive
It is highly desirable to create rapidly and inexpensively deployable mesh networks in certain scenarios. Consider the case of a large storage warehouse; workers are constantly moving in the area and not only do they need to send data periodically but their location needs to be tracked as well. Setting up such network can be accomplished with the IEEE 802.15.4 standard, but a mesh network must be created. There would need to be stationary 802.15.4 nodes that join together to form a backbone infrastructure. This backbone infrastructure (mesh network) would allow the workers, using mobile 802.15.4 nodes, to transmit their …
Subrosa: An Experimental Platform For Studying Timing Analysis Of Real Time Anonymity Systems, Hatim Asger Daginawala
Subrosa: An Experimental Platform For Studying Timing Analysis Of Real Time Anonymity Systems, Hatim Asger Daginawala
Computer Science and Engineering Theses - Archive
Timing analysis poses a significant challenge for the mix based anonymous systems that wish to support low-latency applications like web browsing, instant messaging and Voice over IP (VOIP). Research in this area so far has been done through simulations on ad hoc simulators or non practical local area networks. We developed SubRosa, an experimental platform for studying timing analysis of real time anonymity systems to facilitate the study of Tor like low-latency anonymous systems. We present results of experiments on a real distributed network test bed PlanetLab, where we studied timing analysis attacks and some of the defenses to protect …
Panda Monitoring - A System To Monitor High Performance Computing For The Atlas Experiment-Design, Development,Implementation And Deployment, Prem A. Thilagar
Panda Monitoring - A System To Monitor High Performance Computing For The Atlas Experiment-Design, Development,Implementation And Deployment, Prem A. Thilagar
Computer Science and Engineering Theses - Archive
Grid resources are gaining wide importance in the wake of experiments such as ATLAS aiding in a bigger goal to understand the complexities of nature. The need for a good monitoring system is realized as grid resources are being implemented widely. This work is an analysis of the existing monitoring system of the Panda which is a grid middleware for the ATLAS experiment running in CERN. The thesis aims at identifying the key bottlenecks of the current monitor and speaks about the implementation of a new monitor for the same .The new monitor which is being designed with scalability and …
A Discrete Event Based Stochastic Simulation Approach For Studying The Dynamics Of Biological Networks, Samik Ghosh
A Discrete Event Based Stochastic Simulation Approach For Studying The Dynamics Of Biological Networks, Samik Ghosh
Computer Science and Engineering Dissertations - Archive
With increasing availability of data resources on the molecular parts of a living cell, biologists are focusing on holistic understanding of cellular mechanisms and the emergent dynamics arising out of their complex interactions. Comprehending the fine-grained signal specificity, gene regulation and feedback mechanisms of molecular interactions at a network level forms a central theme of systems biology. With the speed and sophistication of computational methods, in silico modeling and simulation techniques have become a powerful tool for biologists challenged with understanding the system complexity of biological networks. Numerical simulation of classical chemical kinetics (CCK), agent-based simulations of biological processes, and …
Distinct Value Estimation By Sampling On Unstructured Peer To Peer Networks, Zubin Matthew Joseph
Distinct Value Estimation By Sampling On Unstructured Peer To Peer Networks, Zubin Matthew Joseph
Computer Science and Engineering Theses - Archive
Peer-to-Peer networks have become very popular on the Internet, with millions of peers all over the world sharing large volumes of data. The sheer scale of these networks has made it difficult to gather statistics that could be used for building new features. This thesis presents a technique of obtaining estimations of the number of distinct values matching a query on the network. The method is then analyzed by considering simulation results that demonstrate its effectiveness and flexibility in supporting a variety of queries and applications.
An Integrated Framework For Enhancing User Experience For Different Data Services In Multi-Rate Wireless Systems, Sourav Pal
Computer Science and Engineering Dissertations - Archive
Technological advances in multi\--rate wireless systems have made wireless data services an intrinsic part of human life. An abundance of wireless devices, both in the wireless enabled home multimedia systems as well as in corporate offices, have trigerred an array of research in enhancing the wireless data services. The success and acceptance of these various rich data services Technological advances in multi\--rate wireless systems have made wireless data services an intrinsic part of human life. An abundance of wireless devices, both in the wireless enabled home multimedia systems as well as in corporate offices, have trigerred an array of research …
Enhanced Targeting In A Haptic User Interface For The Physically Disabled Using A Force Feedback Mouse, Brian Holbert
Enhanced Targeting In A Haptic User Interface For The Physically Disabled Using A Force Feedback Mouse, Brian Holbert
Computer Science and Engineering Dissertations - Archive
Although the human computer interface continues to evolve by engaging sight, voice, sound, and touch to manipulate the environment, the marriage between mouse and graphic based operating systems remains one of the primary relationships through which we interact with the computer. With the advent of haptics it has become possible to enhance the GUI/mouse relationship with the sense of touch using a haptic mouse, opening new avenues of interaction, in particular for those with disabilities. For the majority of users the mouse is an effective and proven device for human computer interaction. However it is not as well suited for …
Building Energy-Efficient Broadcast Trees Using A Genetic Algorithm In Wireless Sensor Networks, Min Kyung An
Building Energy-Efficient Broadcast Trees Using A Genetic Algorithm In Wireless Sensor Networks, Min Kyung An
Computer Science and Engineering Theses - Archive
In wireless broadcast environment, data can be transmitted to several nodes by a single transmission. The nodes in that environment have limited energy resources; therefore we need to reduce the energy consumption when they broadcast data to all nodes to prolong the lifetime of the networks. We call this problem the MPB (minimum power broadcast) problem, and solving the problem has been shown to be an NP-Complete problem [2], [11]. We focus on finding 'near-optimal' solutions for the problem. An algorithm for constructing the minimum power broadcast trees, named BIP (broadcast incremental power) algorithm, was first proposed by Wieselthier et …
M-Infosift : A Graph-Based Approach For Multiclass Document Classification, Aravind Venkatachalam
M-Infosift : A Graph-Based Approach For Multiclass Document Classification, Aravind Venkatachalam
Computer Science and Engineering Theses - Archive
With the increase in the amount of data being introduced into the Internet on a daily basis, the problem of managing large amount of data is an unavoidable problem. The area of document classification has been examined, explored and experimented as a technique for organizing and managing vast repositories of electronic documents such as emails, text and web pages. Over the past decade, several approaches such as machine learning, data mining, information retrieval and others have been proposed for addressing this problem of classifying electronic documents. While a majority of these techniques rely on extracting high-frequency keywords, they ignore the …
Resource Adaptive Agent Based Fault Tolerant Architecture, Shreyas Shetty
Resource Adaptive Agent Based Fault Tolerant Architecture, Shreyas Shetty
Computer Science and Engineering Theses - Archive
Pervasive environment consists of increasing number of mobile, tiny and heterogeneous devices communicating through interconnected network. As ubiquitous computing has seeped into various aspects of everyday life, there has been an increasing demand for dependable systems. However providing reliability demands fault tolerance mechanisms that require substantial time and resources. The dynamic nature and the uncertainty associated with pervasive systems coupled with the energy constraints of the devices involved makes fault tolerance a challenging task. In general, the techniques used to provide fault-tolerance are based on having redundancy and duplication of the user tasks. However the additional cost and the low …
Incremental Retrieval And Ranking Of Complex Patterns From Text Repositiories, Jayakrishna Thathireddy
Incremental Retrieval And Ranking Of Complex Patterns From Text Repositiories, Jayakrishna Thathireddy
Computer Science and Engineering Theses - Archive
As the volume of information accessible via the electronic medium (such as the Internet) is staggeringly large and growing rapidly, users have to sift through vast reservoirs of information to retrieve relevant data of their choice. It has been estimated that, the Internet consists of 2.5 billion unique, publicly accessible web-pages and this figure is growing at an alarming rate of 7.3 million pages per day. Currently, the only way to wade through such colossal information is by using search engines (such as Google, Live, Yahoo, etc.). Although the popularity of search engines has increased manifold due to -- simplicity …
Top K Query Processing In Distributed Database, Amrita Tamrakar
Top K Query Processing In Distributed Database, Amrita Tamrakar
Computer Science and Engineering Theses - Archive
Today's data is rarely stored in centralized location due to the enormous amount of information that needs to be stored and also to increase reliability, availability and performance of the system. Same data is stored in different format into different company's database as well as they may be partitioned or replicated. We consider various scenarios of distributed database such as horizontal, vertical fragmentation and attribute overlapping. Allowing access to integrated information from these multiple datasets can provide accurate and wholesome information to the end-user. We research on efficient querying to these distributed databases to get top k elements matching the …
Sequence Alignment Editor - A New Tool To Assist With Inferring Phylogenetic And Functional Relationships In Biological Data, Ramya Raghukumar
Sequence Alignment Editor - A New Tool To Assist With Inferring Phylogenetic And Functional Relationships In Biological Data, Ramya Raghukumar
Computer Science and Engineering Theses - Archive
Biologists study evolution, discover functional and structural information in genomic or protein data through the extensive use of sequence alignments. It is very difficult to manually align long regions, so development of methods for this task continues to be an active area of research. Alignment construction algorithms, based on dynamic programming, approach the problem from a mathematical perspective. The optimal alignment is computed relative to a scoring scheme. The resulting layout is guaranteed to be mathematically optimal, though not necessarily biologically meaningful. Sequence alignments usually account only for single letter substitutions and relatively short indels, representing the latter as gaps. …
Performance Analysis Of Caching Effect On Real Time Packet Processing In A Multi-Threaded Processor, Miao Ju
Performance Analysis Of Caching Effect On Real Time Packet Processing In A Multi-Threaded Processor, Miao Ju
Computer Science and Engineering Theses - Archive
Caching has been time proven to be a very effective technique to improve memory access speed and average performance for general processors. Based on the real-world trace simulation, earlier research showed that cache can help improve the route lookup and packet classification performance in a Network Processor (NP). However, the existing studies did not take the packet delay/loss constraints into account. As a result, how effective the caching technique is, in dealing with traffic under stringent delay/loss constraints (as is the case for router interface using an NP for packet processing), is still an open issue. In this thesis, we …
Rate Control Algorithms For Ieee 802.11 Wireless Networks, Bodhisatwa Chakravarty
Rate Control Algorithms For Ieee 802.11 Wireless Networks, Bodhisatwa Chakravarty
Computer Science and Engineering Theses - Archive
This thesis evaluates software driven rate selection algorithms used in IEEE 802.11 wireless network interface cards. The motive of the bit-rate selection techniques is to optimize the throughput over the wireless network out of the many rates that are supported by the IEEE 802.11 link. The decision to switch from one rate to another with the changing link conditions to optimize the throughput is the primary focus of the bit-rate selection algorithms. Due to the uncertainty in the channel quality, it is a challenge to make the correct decision so as to minimize the wastage of network resources and achieve …
Dynamic Push And Pull Strategy Based On Data Interpolation For Web Sensor Networks, Rohita Mohan
Dynamic Push And Pull Strategy Based On Data Interpolation For Web Sensor Networks, Rohita Mohan
Computer Science and Engineering Theses - Archive
Sensor Web, a new trend has been developed recently to effectively network large scale deployed heterogeneous sensors with Internet to make sensor data discoverable, accessible and controllable via World Wide Web. Since sensor nodes are highly resource constrained, continuous back hauling of a large amount of data is not feasible. In this paper, we propose a dynamic push/pull service architecture where sensory quality is dynamically monitored and controlled. The architecture is implemented in a web proxy residing at the gateway of the network. As data is being pushed continuously from the network for effective sketching of the sensing field, interpolation …
A Framework For Improving The Performance Of Application Servers In Next Generation Networks (Ngns), Sumantra R. Kundu
A Framework For Improving The Performance Of Application Servers In Next Generation Networks (Ngns), Sumantra R. Kundu
Computer Science and Engineering Dissertations - Archive
Next generation networks (NGNs) such as IP Multimedia Subsystem (IMS) are completely built on the Internet Protocol (IP) suite. This has made IP the de facto standard for data networking, voice over IP (VoIP), and media rich applications such as streaming multimedia, ringtones, multi-player gaming, and high-definition video conferencing for remote interaction. A primary feature of such converged networks is that they use the same IP-based network for simultaneously delivering voice, video, and data. Such services are provided on application servers built using industry standard Advanced Telecom Computing Architecture (ATCA) based blade computing units with various flavors of commodity open …