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Articles 211 - 240 of 365
Full-Text Articles in Computer Sciences
A Novel Scheme For Contact Predictions In Opportunistic Networks, Sujoy Kumar Bhattacharya
A Novel Scheme For Contact Predictions In Opportunistic Networks, Sujoy Kumar Bhattacharya
Computer Science and Engineering Theses - Archive
In the opportunistic network (ON) paradigm information is exchanged between two devices as they encounter each other. For such information exchange to take place the devices must know about the presence of other devices in the neighborhood. A very fundamental problem in ON is to predict the occurrence of a future opportunistic contact which is otherwise highly dynamic and unreliable. An accurate predictor which takes into account the long time history can benefit from multiple objectives. Such a predictor switches to the data transfer mode in anticipation of a contact. Also it maximizes the number of opportunistic contacts while spending …
Shaping Network Topology For Privacy And Performance, Md Monjurul Hasan
Shaping Network Topology For Privacy And Performance, Md Monjurul Hasan
Computer Science and Engineering Theses - Archive
Anonymity systems provide privacy for Internet communication and are becoming popular. Unfortunately, users experience slow Internet connection through existing systems because paths used to route traffic are selected randomly without considering latency between nodes. In our work, we aim to design a better approach for selecting paths in anonymity systems with improved performance and without sacrificing privacy. We consider stratified topologies for our design where nodes are divided into three hops. We propose a scheme to build restricted network topologies on top of a stratified topology that maximizes throughput. First, we use Tabu Search to build latency-aware stratified restricted topologies …
Control Framework Dynamic Walking Of A Bipedal Robot, Kishan Kumar Bhongale Prabhakar Prasad
Control Framework Dynamic Walking Of A Bipedal Robot, Kishan Kumar Bhongale Prabhakar Prasad
Computer Science and Engineering Theses - Archive
Despite significant progress in recent years, the capabilities of today's Humanoid robots still lack behind the walking abilities of humans in terms of competence, robustness, flexibility, and speed. Furthermore, unknown environmental conditions and related constraints imposed on the robot significantly increase the complexity of locomotion control and decision making for such systems, easily making planning-based approaches intractable. Part of the reason for this is that the control of a humanoid encompasses observation, processing the observed data, and decision making in terms of locomotion gait and body pose parameters. This key information derived from observations and internal robot information finally allows …
Gpu Parallel Collections For Scala, Kishen Das Kondabagilu Rajanna
Gpu Parallel Collections For Scala, Kishen Das Kondabagilu Rajanna
Computer Science and Engineering Theses - Archive
A decade ago, graphics processing units have been used specifically for high-speed graphics. Of late, they are becoming more popular as general purpose parallel processors. With the release of CUDA, ATI Stream and OpenCL, programmers can now split their program execution between CPU and GPU, whenever appropriate, resulting in huge performance gain. The cost of GPU is declining and also their performance is improving faster than CPUs. Although enormous performance gains can be achieved by parallelizing the code, identifying the right candidate for GPU execution is very tricky. Coding in OpenCL is a difficult task because of the memory management …
Privacy For Location Based Services With Smartphones, James Nathaniel Spargo
Privacy For Location Based Services With Smartphones, James Nathaniel Spargo
Computer Science and Engineering Theses - Archive
In recent years, mobile devices and smartphones enabled with GPS and Inter-net access have become extremely common. People use these devices as they woulda personal computer for easy access to information. Location Based Services (LBS)provide customized information based on a user's geographic location that has beenretrieved from a dedicated spatial database such as Google Places, Yahoo's LocalSearch Web Services and Yelp.com. This information can include nearby hotels andrestaurants, gas stations, banks or other Points of Interest (POIs). Since most searchengines and databases are known to store previous queries in order to improve futuresearch results and other data analysis on previous …
Concurrent Polyglot: An Extensible Compiler Framework, Saurabh Satish Kothari
Concurrent Polyglot: An Extensible Compiler Framework, Saurabh Satish Kothari
Computer Science and Engineering Theses - Archive
We have today crossed the threshold of increasing clock frequencies as the dominant solution to faster computing, and it is imperative for software developers to be able to think in the concurrent and parallel paradigm. Important still is to equip programmers with the right tools to develop concurrent and parallel software. Software concurrency is a widely researched area, and many of today's compilers concentrate on compiling for parallelism. However, although concurrent compilers have been explored since the 1970s, very few of them exist today that justify multicore environments. For instance, gmake [1] supports coarse grained parallelism through the -j option …
Delay Tolerant Lazy Release Consistency For Distributed Shared Memory In Opportunistic Networks, Chance Ray Eary
Delay Tolerant Lazy Release Consistency For Distributed Shared Memory In Opportunistic Networks, Chance Ray Eary
Computer Science and Engineering Theses - Archive
Opportunistic networking (ON), a concept which allows a mobile wireless device to dynamically interact with other wireless devices in its immediate vicinity, is a field with great potential to improve the utility of itinerant computational platforms. While ONs increase a device's ability to interact with its peers, the fleeting and intermittent connections between devices make many traditional computer collaboration paradigms, such as distributed shared memory (DSM), virtually untenable. DSM systems, developed for traditional networks, rely on relatively stable, consistent connections among participating nodes. In an ON, connectivity among nodes is distributed in time and space making it useful for delay …
Sybil Defense For Online Social Networks Using Partial Graph Information, Vritant Naresh Jain
Sybil Defense For Online Social Networks Using Partial Graph Information, Vritant Naresh Jain
Computer Science and Engineering Theses - Archive
Online social networks (OSNs) today are proprietary, in the sense that communication between users requires the users to be part of the same OSN. This raises privacy issues and reliability concerns among users, and calls for an open, interoperable, and distributed OSN infrastructure that is similar to email and would link different OSNs together. Any decentralized system, however, is vulnerable to Sybil attacks, in which an attacker claims multiple identities, called Sybils, to overwhelm the OSNs and defeat standard techniques used to protect against attacks such as message spam. The state of the art defense against these attacks is SybilInfer, …
Performance Tuning Of An Embedded Template Analysis Tool, Ashwin Arikere
Performance Tuning Of An Embedded Template Analysis Tool, Ashwin Arikere
Computer Science and Engineering Theses - Archive
As multi core processors become ubiquitous, programs must be designed to utilize the additional power at their disposal. Extracting maximum performance out of these processors requires utilizing latest parallel programming techniques as well as using the latest tools available to increase performance. This thesis delves into enhancing performance of existing programs by applying parallel techniques, utilizing performance analyzers and various other tools developed specially for multi-core system programming. We discuss these techniques and tools and also demonstrate how a Template Analysis program was modified to take advantage of the additional power a multi-core machine has over single core machines to …
Automatic Discovery Of Significant Events From Databases, Avinash Shankar Bharadwaj
Automatic Discovery Of Significant Events From Databases, Avinash Shankar Bharadwaj
Computer Science and Engineering Theses - Archive
The advent of the internet has caused enormous amounts of data available online causing many significant facts to be hidden within this data. Searching for a significant fact within these large datasets is a query intensive process involving large amounts of queries which needs to be executed hence slowing the process of finding the significant facts from a large dataset. In this thesis, a novel approach has been designed exploiting the mathematical characteristics of the data present in the dataset to reduce the number of queries on the dataset. A two phased approach is considered for making fact finding more …
Recommender Systems: An Algorithm To Predict "Who Rate What", Rahul Singhal
Recommender Systems: An Algorithm To Predict "Who Rate What", Rahul Singhal
Computer Science and Engineering Theses - Archive
Recommender systems are systems that recommend content for us by looking at certain factors including what other people are doing as well as what we are doing. Examples of such systems present today are Amazon.com recommending books, CDs, and other products; Netflix recommending movies etc. These systems basically recommend items or movies to customers based on the interests of the present customer and other similar customers who purchased or liked the same item or movie. Our paper goes beyond the concept of overall generic ranking and provides personalized recommendation to users. Despite all the advancements, recommender systems still face problems …
Typifying Wikipedia Articles, Quazi Mainul Hasan
Typifying Wikipedia Articles, Quazi Mainul Hasan
Computer Science and Engineering Theses - Archive
In Wikipedia, each article represents an entity. Entity can have different types like person, country, school, science etc. Although Wikipedia encapsulates category information for each page, sometimes it is not sufficient to deduce the type of a page just from its categories. But, incorporating the clear type information in a Wikipedia page is very important for the users, as it will help them to explore the pages in more organized way. Hence, in my thesis, we explore different standard classification techniques, mainly Naïve Bayes and Support Vector Machines and experiment how these techniques can be made more effective for typifying …
A Comparison And Evaluation Of Motion Indexing Techniques, Harnish Bhatia
A Comparison And Evaluation Of Motion Indexing Techniques, Harnish Bhatia
Computer Science and Engineering Theses - Archive
Motion capture (mocap) is a way to digitally represent the spatio-temporalstructure of human movement. Human motion is generally captured in long sequences to record the natural and complex aspects of human actions, its sequential transitions, and simultaneous combination. As the amount of mocap data increases, it becomes important to index the data in order to improve the performance of information access. The motion indexing problem involves several challenging issues due to the data being high dimensional, continuous, and time-variant. Indexing provides the means to search for similar motion in a mocap database, to recognize a query action as one among …
Selective Cross Correlation In Passive Timing Analysis Attacks Against Low-Latency Mixes, Titus Abraham
Selective Cross Correlation In Passive Timing Analysis Attacks Against Low-Latency Mixes, Titus Abraham
Computer Science and Engineering Theses - Archive
A mix is a communication proxy that hides the relationship between incoming and outgoing messages. Routing traffic through a path of mixes is a powerful tool for providing privacy. When mixes are used for interactive communication, such as VoIP and web browsing, attackers can undermine user privacy by observing timing information along the path. Mixes can prevent these attacks by inserting dummy packets (cover traffic) to obfuscate timing information in each stream. Two recently proposed defenses, defensive dropping and adaptive padding, enhance cover traffic by ensuring that timing information seen at the sender is very different from that seen at …
Towards Modeling The Behavior Of Physical Intruders In A Region Monitored By A Wireless Sensor Network, Pranav Krishnamoorthy
Towards Modeling The Behavior Of Physical Intruders In A Region Monitored By A Wireless Sensor Network, Pranav Krishnamoorthy
Computer Science and Engineering Theses - Archive
A priority task for homeland security is the coverage of large spans of open border that cannot be continuously physically monitored for intrusion. Low-cost monitoring solutions based on wireless sensor networks have been identified as an effective means to perform perimeter monitoring. An ad-hoc wireless sensor network scattered near a border could be used to perform surveillance over a large area with relatively little human intervention. Determining the effectiveness of such an autonomous network in detecting and thwarting an intelligent intruder is a difficult task. We propose a model for an intelligent attacker that attempts to find a detection-free path …
Detecting Medication Consumption Patterns In Assistive Environments, Jyothi K. Vinjumur
Detecting Medication Consumption Patterns In Assistive Environments, Jyothi K. Vinjumur
Computer Science and Engineering Theses - Archive
One of the issues in healthcare systems or medical information systems is the reduction of medical errors to ensure patient safety. Our approach is to develop a cyber physical system which applies different RFID tags to monitor medicine consumption and its impact in an assistive environment. This approach talks about detecting the medication intake pattern in an assistive environment and implements an application oriented experimental research which tracks the drug consumption pattern using RFID readers and tags, motion sensors, a wireless sensor mote and a weight sensor. In this approach, an energy efficient technique by using multiple sensor devices which …
Mathematical Modeling For Phagocyte Transmigration And Reverse Engineering, Min Gon Kang
Mathematical Modeling For Phagocyte Transmigration And Reverse Engineering, Min Gon Kang
Computer Science and Engineering Theses - Archive
Computational modeling and simulation have been used as an important tool to analyze the behavior of a complex biology system. Typically, the biology system is a complex non-linear system where a large number of components are involved. One of the major obstacles in computational modeling and simulation is to determine a large number of parameters in the mathematical equations representing biological properties of the system.To tackle this problem, we have developed a global optimization method, called Discrete Selection Levenberg-Marquardt (DSLM), for parameter estimation. The method uses a non-linear least square approach to approximate the solution of over-determined systems. For fast …
A Novel Architecture For Mobility Enabled Video Conferencing In Next Generation Wireless Networks, Avinash Narayan
A Novel Architecture For Mobility Enabled Video Conferencing In Next Generation Wireless Networks, Avinash Narayan
Computer Science and Engineering Theses - Archive
The Heterogeneous nature of next generation networks requires architecture and technologies that have an intrinsic support for diversity. The plethora of existing wireless access technologies will soon be connected to Internet in the wave of "Internet of Things". We have learnt from many endeavors that no single technology exists that is ubiquitous and connects everything. In Cellular service, aside from the geographic coverage limitation, the major deficiency is lack of complete coverage inside buildings (offices, healthcare facilities, malls, and the like). Once we are inside many public buildings, cellular coverage is blocked by RF opaque walls, but may have strong …
Measuring Named Entity Similarity Through Wikipedia Category Hierarchies, Jared M. Ashman
Measuring Named Entity Similarity Through Wikipedia Category Hierarchies, Jared M. Ashman
Computer Science and Engineering Theses - Archive
Identifying the semantic similarity between named entities has many applications in NLP, including information extraction and retrieval, word sense disambiguation, text summarization and type classification. Similarity between named entities or terms is commonly determined using a taxonomy based approach, but the limited scalability of existing taxonomies has led recent research to use Wikipedia's encyclopedic knowledge base to find similarity or relatedness. These existing methods using Wikipedia have so far focused on relatedness, but are not as well suited to finding similarity. In this thesis, we evaluate methods for determining the semantic similarity between named entities by associating each named entity …
Building Bayesian Network Based Expert Systems From Rules, Saravanan Thirumuruganathan
Building Bayesian Network Based Expert Systems From Rules, Saravanan Thirumuruganathan
Computer Science and Engineering Theses - Archive
Combining expert knowledge and user explanation with automated reasoning in domains with uncertain information poses significant challenges in terms of representation and reasoning mechanisms. In particular, reasoning structures understandable and usable by humans are often different from the ones for automated reasoning and data mining systems.Rules are a convenient and human understandable way to express domain knowledge and build expert systems. Adding certainty factors to these rules presents one way to deal with uncertainty in rule based expert systems. However such systems have limitations in accurately modeling the domain. Bayesian Network, on the other hand, is a probabilistic graphical model …
Embedded Sparse Representation For Image Classification, Jin Huang
Embedded Sparse Representation For Image Classification, Jin Huang
Computer Science and Engineering Theses - Archive
Image classification, such as face recognition and scene categorization, is an important research area in computer vision over the last decade. It has been successfully applied to many image analysis applications. Images usually have a large number of features, hence the dimensionality reduction methods are often employed before the subsequent classification to improve the classification results. A lot of methods have been proposed, including but not limited to PCA, ICA, LDA, and Bayesian Framework. Recently, compressive sensing and sparse learning have been widely studied and applied into computer vision research. Ma et al. suggested a new method called Sparse Representation …
Evaluation Of Ferry Based Opportunistic Message Dissemination With Deterministic Inter Contact Times, Samreen Tahir
Evaluation Of Ferry Based Opportunistic Message Dissemination With Deterministic Inter Contact Times, Samreen Tahir
Computer Science and Engineering Theses - Archive
Opportunistic Networks are characterized by intermittent connectivity and volatile topology. In such a network scenario, traditional Mobile Ad hoc Network (MANET) routing protocols cannot work efficiently. Hence, a novel way of message forwarding is required that operates even when an end-to-end path between a source and destination pair may never exist. Delay Tolerant Networks (DTNs) are an approach to alleviate network partitioning by working on the `store-carry-forward' paradigm [4]. Opportunistic Networks encompass DTNs and typically involve mobile devices that exchange data by taking advantage of their proximity to other nodes. Nodes in opportunistic networks may be heterogeneous with respect to …
Handling Periodic Signs In American Sign Language Using Synthetic Generation Of Periods, Himanshu Pahwa
Handling Periodic Signs In American Sign Language Using Synthetic Generation Of Periods, Himanshu Pahwa
Computer Science and Engineering Theses - Archive
American Sign Language (or ASL) is the dominant sign language of deaf people in United States and parts of Canada. 500,000 to 2 million people use ASL as their primary language in United States. ASL uses hands, face and body, with constantly changing movements and orientations. Since the language is based on gestures, not a printed alphabet, it gets difficult to know the associated meaning given a video. There are multimedia tools and dictionaries available to view a sign video for a given word but there are no dictionaries available which, given a sign video will respond with corresponding word. …
A Human Motion Database: The Cognitive And Parametric Sampling Of Human Motion, Arnab Biswas
A Human Motion Database: The Cognitive And Parametric Sampling Of Human Motion, Arnab Biswas
Computer Science and Engineering Theses - Archive
Motion databases have a strong potential to guide progress in the field of machine recognition and motion-based animation. Existing databases either have a very loose structure that do not sample the domain according to any controlled methodology or too few action samples which limits their potential to quantitatively evaluate the performance of motion-based techniques. The controlled sampling of the motor domain in the database may lead investigators to identify the fundamental difficulties of motion cognition problems and allow the addressing of these issues in a more objective way. In this thesis, we describe the construction of our Human Motion Database …
Mimic: An Active Covert Channel That Evades Regularity-Based Detection, Kush Kothari
Mimic: An Active Covert Channel That Evades Regularity-Based Detection, Kush Kothari
Computer Science and Engineering Theses - Archive
A covert timing channel is a hidden communication channel based on network timing that an attacker can use to sneak secrets out of a secure system. Active covert channels, in which the attacker uses a program to automatically generate innocuous traffic to use as a medium for embedding the covert channel, are especially problematic, as they allow the attacker to output large amounts of secret data. A promising technique for detecting covert timing channels focuses on using entropy-based tests. This technique can reliably detect known covert timing channels by using a combination of entropy (EN) and conditional entropy (CE) to …
Target Tracking With Lucas-Kanade Optical Flow And Particle Filters Through Affine Transforms And Occlusion, Justin Graham
Target Tracking With Lucas-Kanade Optical Flow And Particle Filters Through Affine Transforms And Occlusion, Justin Graham
Computer Science and Engineering Theses - Archive
This paper investigates a hybrid approach derived from Lucas-Kanade optical flow tracking and particle filters that is capable of tracking objects through occlusion and affine transformations. This approach is inspired by aircraft sensor pod infrared and electro-optical tracking applications. For aircraft based sensors, it is important that a tracking system be able to track through rotations as the aircraft orbits a targeting area. It is also of use to handle cases where the target may be momentarily occluded due to other vehicles or obstacles in the area. The main focus of this investigation is to find a technique that performs …
A Framework For Real-Time Fault Detection And Response In Multi-Agent Teams, Matthew B. Middleton
A Framework For Real-Time Fault Detection And Response In Multi-Agent Teams, Matthew B. Middleton
Computer Science and Engineering Theses - Archive
This thesis details the creation of a fault detection and response framework that can be applied to mobile multi-agent teams. This framework unites existing concepts of conditioned based maintenance and real-time machine diagnostics with a high-level matrix based discrete event command and control system that can respond to detected mechanical faults in agents in real-time. This allows for automatic corrective actions to be taken when an agent experiences failure if redundant resources are available to replace the failed unit or for the mission planner to be notified that the mission is no longer achievable given the operating conditions of the …
Real Time Hardware And Software Systems For Micro Air Vehicle Flight Control Testing, Christopher Dale Mcmurrough
Real Time Hardware And Software Systems For Micro Air Vehicle Flight Control Testing, Christopher Dale Mcmurrough
Computer Science and Engineering Theses - Archive
The trend of increasing capabilities of micro scale electrical, mechanical, and computing systems is opening up the possibilities of new unmanned vehicle platforms. Both unmanned aerial and ground vehicles have traditionally been created from large conventional platforms such as automobiles, rotorcraft, and fixed wing aircraft. These conventional chassis designs are durable and proven, but the benefits of automating these types of platforms are limited by their inherent human-centric design. Many real-world applications would benefit greatly from vehicle classes designed with unconventional means such as biologically inspired locomotion. Micro air vehicles are a class of vehicles that have recently began moving …
Fast Jamming Detection In Wireless Sensor Networks, Kartik Siddhabathula
Fast Jamming Detection In Wireless Sensor Networks, Kartik Siddhabathula
Computer Science and Engineering Theses - Archive
Non-dedicated medium of communication for Wireless Sensor Networks (WSN) makes them vulnerable to jamming attack where an adversary injects strong signal or noises to interfere with the transmission and thus block the channel. In applications such as border security, people are particularly interested in the areas where the channel is currently jammed. It is therefore crucial to be able to detect the jamming attacks as fast as possible. Existing studies have shown that the most effective indicator of jamming attacks is the packet delivery ratio (PDR). However, current PDR-based schemes use end-to-end packet delivery ratio, which requires one to observe …
Fast And Energy-Efficient Technique For Jammed Region Mapping In Wireless Sensor Networks, Nabila Rahman
Fast And Energy-Efficient Technique For Jammed Region Mapping In Wireless Sensor Networks, Nabila Rahman
Computer Science and Engineering Theses - Archive
Wireless sensor networks (WSNs) have great practical importance for surveillance systems to perform monitoring by acquiring and sending information about intrusions into a secured area. Very little human intervention is required for WSNs, which is one of the most desirable features of them and thus making them a cheaper and safer alternative for securing large area such as international borders. Jamming attacks in WSNs can be applied to disrupt communications among the sensor nodes in the network by barring the reception of wireless signals of the sensor nodes' transceivers. Since it is difficult to prevent jamming attacks, detection and mapping …