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Articles 181 - 210 of 365
Full-Text Articles in Computer Sciences
A Cloud Based Automated Anomaly Detection Framework, Prathibha Datta Kumar
A Cloud Based Automated Anomaly Detection Framework, Prathibha Datta Kumar
Computer Science and Engineering Theses - Archive
A machine-to-machine (M2M) communications network hosts millions of heterogeneous devices such as for vehicle tracking, medical services, and home automation and security services. These devices exchange thousands of messages over cellular networks. These messages are Signaling System No. 7 (SS7) messages of various types like authentication, mobility management, and many more, resulting in tera bytes of SS7 signaling traffic data over a period of days. The data generated is diverse, depending on several factors like device activity, hardware manufacturers, and radio / tower interaction. This inherent diversity makes anomaly detection in a M2M network challenging. With millions of messages to …
A Source Code Search Engine For Keyword Based Structural Relationship Search, Asheq Hamid
A Source Code Search Engine For Keyword Based Structural Relationship Search, Asheq Hamid
Computer Science and Engineering Theses - Archive
In an Object Oriented Program, we often see that a package contains several classes, a class contains several methods, a method calls other methods. We may say, there is a contains relationship between a package and a class or a calls relationship between two methods. We refer to these relationships as structural relationships. There may be other structural relationships apart from contains or calls in the source code. A software developer may sometime want to search for structural relationships within source code. She may prefer using Google like free form query to do so. To facilitate free form query based …
Improving Gesture Recognition Performance Using The Dynamic Space-Time Warp Algorithm, Danny Allen Hanson
Improving Gesture Recognition Performance Using The Dynamic Space-Time Warp Algorithm, Danny Allen Hanson
Computer Science and Engineering Theses - Archive
The DSTW algorithm was originally used as the fundamental algorithm for a gesture recognition software. When the need arose for implementing gesture recognition on-board a robotic vehicle, the original recognition software needed to undergo several changes in order to meet the requirements of the target platform. The original software was written in Matlab and had to be ported into a native language in order to operate on the new platform. To support experiments needed to select a distance and t function, the new code needed to be designed to support dynamic binding of distance and transition (t) functions. The software …
Learning Equivalent Input Channel Mappings And Generalized Features For Pattern Transfer, Houtan Rahmanian
Learning Equivalent Input Channel Mappings And Generalized Features For Pattern Transfer, Houtan Rahmanian
Computer Science and Engineering Theses - Archive
In many real-world modeling applications, it is needed to detect the origin of the patterns of the input data in addition to find the patterns themselves. Having the input data generated by a systematically organized set of input channels is very common in these applications. These input channels might also be of the same type. Therefore, the same pattern might be observed on different sets of input channels of the data, while it is caused by the one source in different localities. Sparse coding is a very powerful method for learning high-level patterns (i.e. high-level features) from raw data input. …
Detection Of Fingers With A Depth Based Hand-Detector In Static Frames, Sanjay Vasudeva Iyer
Detection Of Fingers With A Depth Based Hand-Detector In Static Frames, Sanjay Vasudeva Iyer
Computer Science and Engineering Theses - Archive
This thesis presents a method for a finger detection system. It is assumed that the user taps their fingers on a table, and that the camera is placed on the same table in front of their fingers. This setup is motivated by the application of analyzing the movement of fingers in patients engaging in physical therapy. Fingers are detected in static images, which is a more challenging task than detecting and tracking fingers in videos which are based on motion.The Microsoft Kinect sensor has been used as a source for data, and it provides color and depth images at each …
Dovetail: Stronger Anonymity In Next-Generation Internet Routing, Jody Mark Sankey
Dovetail: Stronger Anonymity In Next-Generation Internet Routing, Jody Mark Sankey
Computer Science and Engineering Theses - Archive
Current low-latency anonymity systems use complex overlay networks to conceal a user's IP address, introducing significant latency and network efficiency penalties compared to normal Internet usage. Rather than this obfuscation of network identity through higher level protocols, we recommend a more direct solution: a routing protocol that allows communication without exposing network identity, providing a strong foundation for Internet privacy, while allowing identity to be defined in those higher level protocols where it adds value. We propose Dovetail, a next-generation Internet routing protocol that provides anonymity against an active attacker located at any single point within the network. Key design …
Lilac: Architecture For Anonymous Light Weight Communication, Ankit Upadhyaya
Lilac: Architecture For Anonymous Light Weight Communication, Ankit Upadhyaya
Computer Science and Engineering Theses - Archive
We present lilac; a circuit based low latency anonymous light weight instant messaging communication system. This browser based chat platform provides anonymity in context with unlinkability and unobservability for the secured real-time communication. The system uses a relay based anonymization mechanism where circuits are built and routed over a set of trusted nodes in the network. Unlike other typical instant messaging systems, Lilac uses user pseudonymity and ephemeral message exchange, which eliminates conventional user registration and storing the messages for the future retrieval; this leaves no footprints behind in the system in terms of user information, who talks to whom …
Modeling An Intelligent Intruder In A Region Monitored By A Wireless Sensor Network, Sriram Srinivasan
Modeling An Intelligent Intruder In A Region Monitored By A Wireless Sensor Network, Sriram Srinivasan
Computer Science and Engineering Theses - Archive
Monitoring to detect unauthorized border crossing is very important for protecting national security. To accomplish this by continuous physical monitoring by border patrol agents is impractical. Networks of low-cost wireless sensors have been identified as a useful tool in monitoring with minimal human intervention. However, ensuring the effectiveness of unattended monitoring against an intelligent intruder is difficult, since the intruder can probe the system for weaknesses. To better understand the capabilities of such an intruder, we propose a model for an intelligent intruder whose purpose is to find a detection-free path across the border by which he could cross back …
Sign Gesture Spotting In American Sign Language Using Dynamic Space Time Warping, Srujana Gattupalli
Sign Gesture Spotting In American Sign Language Using Dynamic Space Time Warping, Srujana Gattupalli
Computer Science and Engineering Theses - Archive
American Sign Language (ASL) is the primary sign language used by approximately 500,000 deaf and hearing-impaired people in the United States and Canada. ASL is a visually perceived, gesture-based language that employs signs made by moving the hands combined with facial expressions and postures of the body. There are several software tools available online to learn signs for a given word but there is no software that gives the meaning of any sign video. If we need to search or look up documents containing any word we can just type it in search engines like Google, Bing etc. but if …
Development And Simulation Of Focus Of Attention Using Reinforcement Learning And Function Approximation, Stephen Ratz
Development And Simulation Of Focus Of Attention Using Reinforcement Learning And Function Approximation, Stephen Ratz
Computer Science and Engineering Theses - Archive
Without short-term memory, people would have little hope to learn and accomplish tasks. The same can be said for artificially intelligent agents. Often referred as Miller's Law, the number of working objects that a human can hold in working memory is around seven. For an AI agent, the cost of keeping additional memory blocks is exponential. Other issues to consider are what to keep in memory and for how long. Only a few of many of an agent's previous steps may be important to hold on to. This thesis project attempts to train an intelligent agent to learn what to …
Hydrological Visualization And Analysis System And Drought Related Feature Selection Based On Sectional Correlation Measurement, Piraporn Jangyodsuk
Hydrological Visualization And Analysis System And Drought Related Feature Selection Based On Sectional Correlation Measurement, Piraporn Jangyodsuk
Computer Science and Engineering Theses - Archive
Because of the larger data storage and the faster computational power, computer can process and store much finer resolution data. Aside from data analysis, data visualization is also an important task to understand the data. In this work, the Hydrological Visualization and Analysis System is developed to help both hydrologists and local people view and examine the high resolution hydrological data. Then, this data is analyzed to determine which variables are related to the change of drought condition in Arlington, Texas. A new correlation measurement method called sectional correlation is proposed and used as an objective function of the drought …
Dynamic Cache Reconfiguration For Energy Optimization In Chip Multiprocessors, Gaurav Puri
Dynamic Cache Reconfiguration For Energy Optimization In Chip Multiprocessors, Gaurav Puri
Computer Science and Engineering Theses - Archive
Cache reconfiguration for chip multiprocessors (CMP) in order to reduce energy consumption is a challenging research problem. This thesis presents a dynamic scheme for level one cache design where the processing core can dynamically switch to a lower energy configuration. The proposed scheme is based on a heuristic that can either be executed as part of the firmware or implemented in hardware with very low additional overhead. The heuristic functions periodically after a pre-defined fixed interval for each processing core. The heuristic first examines the statistics calculated over the previous intervals and then switches the cache to an improved configuration …
Automatic Scheduler: A New Approach For Scheduling Rides, Amey Sudhir Bhalerao
Automatic Scheduler: A New Approach For Scheduling Rides, Amey Sudhir Bhalerao
Computer Science and Engineering Theses - Archive
Scheduling plays an important role in a person's life. Even computers use the concept of scheduling when it comes to processing jobs. Scheduling is important in cases normally when there is large data to process and manual scheduling is not an easy option to go for. A new concept of developing a scheduler has been discussed in this thesis. The algorithm was designed keeping in mind the Para Transit agencies that operate on federal funds to provide cheap transport service to the clients. The algorithm presented here is developed with the intention to reduce the delay faced by the client …
Querying Entity-Relationship Graphs By Example Tuples: Experimental Evaluation And User Study, Mahesh Gupta
Querying Entity-Relationship Graphs By Example Tuples: Experimental Evaluation And User Study, Mahesh Gupta
Computer Science and Engineering Theses - Archive
The World Wide Web today has evolved into a rich repository of entities where many knowledge bases containing entity-related information are directly available. Such knowledge bases are often in the form of entity-relationship graphs. To query entity-relationship graphs, users need to provide input entities, attributes and relationships by complex query graphs. To improve the usability of graph database systems, we study a novel mechanism that queriesentity-relationship graphs by example tuples. It allows users to express a query in the form of one or more tuples consisting of entities. The underlying query system automatically builds aquery graph based on the example …
Implementation Of A Middleware Architecture For Collaboration Among Mobile Devices In Opportunistic Networks., Samaya Madhavan
Implementation Of A Middleware Architecture For Collaboration Among Mobile Devices In Opportunistic Networks., Samaya Madhavan
Computer Science and Engineering Theses - Archive
Opportunistic networks provide a viable platform for mobile communications due to the ubiquity of smart phones. These networks are characterized by lack of end to-end reliable connections. In such networks, establishing collaboration among nodes is a challenge. In this thesis, a middleware architecture for opportunistic communication and collaboration has been designed, developed, and implemented. The middleware architecture supports a protocol for efficiently exchanging information between mobile nodes during an opportunistic contact. Message formats for differentiating the various kinds of messages that will be transferred across the network are defined to maintain consistency and reduce redundancy. The architecture consists of several …
Subrosa 2 : An Experimental Evaluation Of Timing Analysis Attacks And Defenses In Anonymity Systems, Payap Sirinam
Subrosa 2 : An Experimental Evaluation Of Timing Analysis Attacks And Defenses In Anonymity Systems, Payap Sirinam
Computer Science and Engineering Theses - Archive
A circuit-based low-latency anonymous communication service such as Tor helps Internet users hide their IP addresses and thereby conceal their identities when communicating online. However, this kind of service is vulnerable to timing analysis attacks that can discern the relationship between incoming and outgoing messsages in order to find correlations between them. The attacker can use this information to reveal the idenity of the internet users without knowing the IP addresses concealed in the anonymous communication services.Dependent link padding (DLP) is a scheme propsed to enable anonymity systems to resist these attacks. However, DLP adds high overhead from dummy packets …
System For Interpretation Of Reviewer Feedback On Social Web, Shrikant Desai
System For Interpretation Of Reviewer Feedback On Social Web, Shrikant Desai
Computer Science and Engineering Theses - Archive
The increasing popularity of social media web sites such as Amazon, Yelp and others has influenced our online decision making. Before making selection decisions on movies and restaurants, we investigate its reviewer feedback. Social media web sites provide reviewer feedback in the form of ratings, tags, and user reviews. However, overwhelming feedback details will leave the user in a quandary as to decide whether the item is desirable or not. Potential buyers either make a snap judgment based on the aggregate ratings/tags or spend a lot of time in reading reviews.In this thesis, we build a system that can analyse …
Learning Partially Observable Markov Decision Processes Using Abstract Actions, Hamed Janzadeh
Learning Partially Observable Markov Decision Processes Using Abstract Actions, Hamed Janzadeh
Computer Science and Engineering Theses - Archive
Transfer learning and Abstraction are among the new and most interesting research topics in AI and address the use of learned knowledge to improve learning performance in subsequent tasks. While there has been significant recent work on this topic in fully observable domain, it has been less studied for Partially Observable MDPs. This thesis addresses the problem of transferring skills from the previous experiences in POMDP models using high-level actions (Options) in two different kind of algorithms: value iteration and expectation maximization. To do this, this thesis first proves that the optimal value function remains piecewise-linear and convex when policies …
Selective Grouping Algorithm For Low Latency Anonymous Systems, Vishal Gupta
Selective Grouping Algorithm For Low Latency Anonymous Systems, Vishal Gupta
Computer Science and Engineering Theses - Archive
Low latency anonymous communications are prone to timing analysis attacks. It is a technique by which the adversary can de-anonymize the user by correlating packet timing patterns. A recent proposal to stop these attacks is called Dependent Link padding. However, it creates high dummy packets overhead in the network. In this work we propose selective grouping, a padding scheme that protects users in an anonymity system from those attacks with minimal overhead. The aim is to decrease overhead by dividing users in different groups while maintaining good anonymity. The key idea of our approach is to group clients with similar …
Shaping And Maintenance Of Low-Latency Anonymity Systems, Harsha Doreswamy
Shaping And Maintenance Of Low-Latency Anonymity Systems, Harsha Doreswamy
Computer Science and Engineering Theses - Archive
Surveillance of users on the Internet is growing. This makes it increasingly important to protect users' identity when they communicate online, especially for users like journalists, whistleblowers, and military officials. Anonymity systems can conceal users' identities and provide anonymity for their online activities. Low-latency anonymity systems like Tor are designed to provide support for applications like Web browsing, video streaming, and online chat. To make the commutation between source and destination unlinkable, Tor routes all the traffic through three Tor relays, which are spread across the globe. These three relays are usually chosen without considering the delay to get from …
Choices And Consequences: A Game-Based Risky Behavior Prevention Program, Amanda Michelle Vines
Choices And Consequences: A Game-Based Risky Behavior Prevention Program, Amanda Michelle Vines
Computer Science and Engineering Theses - Archive
Serious games have been defined as a mental contest played with a computer in accordance to specific rules that use entertainment to further government or corporate training, education, health, public policy and strategic communication objectives. There have been various studies done to gauge the effectiveness of serious games to teach and engage. In collaboration with professors in social work and computer science, we have designed a multiplayer, social, serious game called Choices and Consequences (C&C) in an effort to better reach the audience of pre-teens and teens in order to reduce the risk taking behaviors of youth today. The game …
Reducing The Complexity Of Reinforcement Learning In Pomdps By Decomposition Into Decision And Perceptual Processes, Rasool Fakoor
Reducing The Complexity Of Reinforcement Learning In Pomdps By Decomposition Into Decision And Perceptual Processes, Rasool Fakoor
Computer Science and Engineering Theses - Archive
Markov Decision Processes (MDPs) and Partially Observable Markov Decision Processes (POMDPs) are very powerful and general frameworks to model decision and decision learning tasks in a wide range of problem domains. As a result, they are widely used in complex and real-world situations such as robot control tasks. However, the modeling power and generality of the frameworks comes at a cost in that the complexity of the underlying models and corresponding algorithms grows dramatically as the complexity of the task domain increases. To address this , this work presents an integrated and adaptive approach that attempts to reduce the complexity …
Measurements Of A Latency-Biased Expander Topology In The Tor Anonymity System, Subhasish Dutta Chowdhuri
Measurements Of A Latency-Biased Expander Topology In The Tor Anonymity System, Subhasish Dutta Chowdhuri
Computer Science and Engineering Theses - Archive
Anonymous communication systems protect the privacy of their users by hiding who is communicating with whom. With the widespread use of the Internet, anonymity systems are all the more essential to support applications having strong privacy requirements such as intelligence gathering, military communications, or e-voting protocols. Anonymity systems must balance security and performance to remain popular with their users. In this work, we perform measurements on anonymity systems to improve their performance. We use the Vivaldi network coordinate system to efficiently map out the relative delays between hosts. Using this data, we create an overlay expander network topology that is …
Point Of Gaze Applications For Assistive Interaction, Jonathan Walter Rich
Point Of Gaze Applications For Assistive Interaction, Jonathan Walter Rich
Computer Science and Engineering Theses - Archive
Eye tracking has many useful applications in human-machine interfaces and assistive technologies. Traditional input methods, such as the keyboard and mouse, are not practical in certain situations and can be completely ineffective for users with physical disabilities. Since many computing interfaces contain a strong visual component, it follows that knowledge of the user's point of gaze (PoG) can be extremely useful. Several approaches to PoG tracking have been described with various results and associated costs. Commercially available tracking devices have proven to be very useful for some disabled users, though often the systems can be cost prohibitive. Many computing applications …
An Experiment In Developing Small Mobile Phone Applications Comparing On-Phone To Off-Phone Development, Tuan Anh Nguyen
An Experiment In Developing Small Mobile Phone Applications Comparing On-Phone To Off-Phone Development, Tuan Anh Nguyen
Computer Science and Engineering Theses - Archive
TouchDevelop represents a radically new mobile application development model, as TouchDevelop enables mobile application development on a mobile device. I.e., with TouchDevelop, the task of programming say a Windows Phone is shifted from the desktop computer to the mobile phone itself. We describe a first experiment on independent, non-expert subjects to compare programmer productivity using TouchDevelop vs. using a more traditional approach to mobile application development.
Development Of A Detached Vital Sign Home Monitoring Management System, Anderson John
Development Of A Detached Vital Sign Home Monitoring Management System, Anderson John
Computer Science and Engineering Theses - Archive
Patients coping with chronic illnesses are often inconvenienced with routine doctor visits for the sole purpose of conducting basic vital sign monitoring. Such visits tend to be disruptive, and are more so when the patient requires a lengthy commute or has a mobility disability. As technology progresses, advances in low powered integrated circuits and network connectivity has opened the doors to a new world of remote patient monitoring. This thesis explores the possibility of using low powered technology to develop a patient monitoring system that's completely detached, thus allowing patients to move around their homes while the monitoring continues. We …
Prominent Streaks Discovery On Blog Articles, Jijo John Philip
Prominent Streaks Discovery On Blog Articles, Jijo John Philip
Computer Science and Engineering Theses - Archive
We are surrounded by data in various forms such as instant messages, Twitter tweets, Facebook status updates, news, media, blogs and much more. Extracting meaning from such a massive collection of unstructured data would lead to interesting stories. Examples of such stories can be ``\emph{Who was the most popular actor in a particular month}''or ``\emph{Which diseases were people most concerned about in year 2008}''. In this thesis, we propose to discover popular entities mentioned in blog articles based on the concept of prominent streak. Given a sequence of values for a named entity (e.g., a person, a place, etc.), where …
On Feasibility Of Fingerprinting Wireless Sensor Nodes Using Physical Properties, Xiaowei Mei
On Feasibility Of Fingerprinting Wireless Sensor Nodes Using Physical Properties, Xiaowei Mei
Computer Science and Engineering Theses - Archive
Fingerprinting wireless devices using physical properties has been recently suggested as an alternative for device identification and authentication. It has been found that the clock skew caused by the frequency discrepancy of the quartz crystals in different devices can be used as a reliable source for fingerprinting. Researchers have studied the application of the clock skew-based fingerprinting in sensor networks and claimed that it can detect fake identities, wormholes, and node replicas. However, the study in this paper draws a completely opposite conclusion, i.e., the clock skew of sensor nodes can be easily forged by adversaries to evade the detection. …
Pushpop: A Card Game, Vishal Subramani
Pushpop: A Card Game, Vishal Subramani
Computer Science and Engineering Theses - Archive
In this thesis we have designed and implemented an Android card game called PushPop. This game is meant to stimulate the interest of kids in math learning. The Android game has cards with mathematical signs instead of the traditional suits. To reach the goal kids have to perform a lot of mathematical operations which helps them learn maths in a fun and effective way. A study was made to classify PushPop into the various games under the research umbrella of Game Theory. After the analysis we conclude that PushPop is a non-co-operative, symmetric, non-zero sum, simultaneously and imperfect information game …
Comparing Web Application Scanners For Xss Attacks, Dengfeng Xia
Comparing Web Application Scanners For Xss Attacks, Dengfeng Xia
Computer Science and Engineering Theses - Archive
As software industry is paying increasing attention to web application security, various testing tools with black box testing feature have been developed. To better evaluate their performance, researchers have made efforts in several ways. Since XSS attack is one of the major attacks which can bring severe damages to victims, it is meaningful to pay specific attention to its testing process. However, many web application scanner evaluation projects make comparisons about various vulnerability types, and they are not dedicated to XSS issues enough. Their evaluations either use vulnerable applications in real life, or use test cases created by themselves, and …