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Articles 961 - 990 of 1053
Full-Text Articles in Computer Sciences
Motif Discovery In Biological Sequences, Medha Pradhan
Motif Discovery In Biological Sequences, Medha Pradhan
Master's Projects
With the large amount of biological data generated due to DNA sequencing of various organisms, it is becoming necessary to identify techniques that can help in finding useful information amongst all the data. Finding motifs involves determining meaningful short sequences that may be repeated over many sequences in various species. Various approaches for the motif discovery problem have been proposed in the literature. One method suggests using genetic algorithms. In this project, an evolutionary approach for motif discovery has been explored. The population is clustered during every generation of the algorithm and then evolved locally within the clusters to allow …
Trust-Networks In Recommender Systems, Kristen Mori
Trust-Networks In Recommender Systems, Kristen Mori
Master's Projects
Similarity-based recommender systems suffer from significant limitations, such as data sparseness and scalability. The goal of this research is to improve recommender systems by incorporating the social concepts of trust and reputation. By introducing a trust model we can improve the quality and accuracy of the recommended items. Three trust-based recommendation strategies are presented and evaluated against the popular MovieLens [8] dataset.
Accelerometer Based Motion Gestures For Mobile Devices, Neel Parikh
Accelerometer Based Motion Gestures For Mobile Devices, Neel Parikh
Master's Projects
Many smart phones today use tiny sensors called accelerometers to provide enhanced user interface controls. Accelerometers measure the linear acceleration in the x, y, z directions based on the movement of the phone. These sensors basically reduce the need of dedicated navigation and function keys on the mobile device. Accelerometer based mobile devices use this principle for creating applications like games, controlling the orientation of the display screen, etc. The goal of this project is to extend the WebKit browser interface of Google’s mobile development platform called ‘Android’ by creating accelerometer based motion features like shake feature, orientation of images, …
Algorithm To Obtain Total Order From Partial Orders For Social Networks, Chandrika Satyavolu
Algorithm To Obtain Total Order From Partial Orders For Social Networks, Chandrika Satyavolu
Master's Projects
We developed an algorithm for generating total orders from partial orders based on a variant of QuickSort. We also constructed a website: 100 best movies! that would generate and display the total order of the best 100 movies from partial orders that are humanly ordered and stored in a database. The users of the website can add new movies of different categories to the database. The users can also generate partial rankings within specific categories. The total order of 100 best movies! would be calculated from the humanly computed partial orders stored in the database.
Semantic Categorization Of Online Video, Supraja Swarna
Semantic Categorization Of Online Video, Supraja Swarna
Master's Projects
As internet users are increasing day by day, the users of video-sharing site are also increasing. Video-sharing is becoming more and more popular in e-learing, but the current famous websites like youtube are not structured when it come to serving the purpose of providing educational videos for preschool and high school students. There is a need to fill building more educationally focused video site, where the content is more structured, easy to use, support both direct search and browsing, and follow a particular curriculum for preschool and high school students. This report discuss the issues like categorization and search interface …
Visualization Web Portal On The Grid, Sandhya Turaga
Visualization Web Portal On The Grid, Sandhya Turaga
Master's Projects
Grid-based visualization portals help scientists explore data that is distributed across the globe and to visualize the data. Visualization allows scientists to explore data effectively and helps them to obtain further insights into the data. We developed a visualization grid portal whose main aim is to be able to store large data sets across machines in a cluster in a distributed fashion, and to allow users of the Grid Portal to visualize the data set effectively. This Grid portal uses HADOOP, a grid platform that facilitates flexible data storage in a distributed fashion, and supports distributed computation as well. The …
Code Obfuscation And Virus Detection, Ashwini Venkatesan
Code Obfuscation And Virus Detection, Ashwini Venkatesan
Master's Projects
Typically, computer viruses and other malware are detected by searching for a string of bits which is found in the virus or malware. Such a string can be viewed as a “fingerprint” of the virus. These “fingerprints” are not generally unique; however they can be used to make rapid malware scanning feasible. This fingerprint is often called a signature and the technique of detecting viruses using signatures is known as signaturebased detection [8]. Today, virus writers often camouflage their viruses by using code obfuscation techniques in an effort to defeat signature-based detection schemes. So-called metamorphic viruses are viruses in which …
Multi-Dimensional Partitioning In Buc For Data Cubes, Kenneth Yeung
Multi-Dimensional Partitioning In Buc For Data Cubes, Kenneth Yeung
Master's Projects
Bottom-Up Computation (BUC) is one of the most studied algorithms for data cube generation in on-line analytical processing. Its computation in the bottom-up style allows the algorithm to efficiently generate a data cube for memory-sized input data. When the entire input data cannot fit into memory, many literatures suggest partitioning the data by a dimension and run the algorithm on each of the single-dimensional partitioned data. For very large sized input data, the partitioned data might still not be able to fit into the memory and partitioning by additional dimensions is required; however, this multi- dimensional partitioning is more complicated …
Javafx As A Domain-Specific Language In Scala / Groovy, Sadiya Hameed
Javafx As A Domain-Specific Language In Scala / Groovy, Sadiya Hameed
Master's Projects
Domain-Specific Languages (DSLs) are optimized for developing applications in a particular domain. JavaFX is such a DSL for creating rich graphical user interfaces.One method to create a DSL is to implement it in an existing language. This offers the advantage that existing users of the language do not need to learn a new language to work in the DSL. Scala and Groovy are two upcoming Java based languages which boast a feature set that can be used to extend existing languages and facilitate DSL creation. In this project my goal was to evaluate the ability of Scala and Groovy to …
Authoring And Sharing Of Programming Exercises, Somyajit Jena
Authoring And Sharing Of Programming Exercises, Somyajit Jena
Master's Projects
In recent years, a number of exercises have been developed and published for educating students in the field of Computer Science. But these exercises exist in their own silos. There is no apparent mechanism to share these exercises among researchers and instructors in an effective and efficient manner. Moreover, the developers of these programming exercises are generally using a proprietary system for automatic submission and grading of these exercises. Each of these systems dictates the persistent format of an exercise that may not be inter-operable with other automatic submission and grading systems. This project provides a solution to this problem …
A Seeded Genetic Algorithm For Rna Secondary Structural Prediction With Pseudoknots, Ryan Pham
A Seeded Genetic Algorithm For Rna Secondary Structural Prediction With Pseudoknots, Ryan Pham
Master's Projects
This work explores a new approach in using genetic algorithm to predict RNA secondary structures with pseudoknots. Since only a small portion of most RNA structures is comprised of pseudoknots, the majority of structural elements from an optimal pseudoknot-free structure are likely to be part of the true structure. Thus seeding the genetic algorithm with optimal pseudoknot-free structures will more likely lead it to the true structure than a randomly generated population. The genetic algorithm uses the known energy models with an additional augmentation to allow complex pseudoknots. The nearest-neighbor energy model is used in conjunction with Turner’s thermodynamic parameters …
Web Security Detection Tool, Abhishek Agashe
Web Security Detection Tool, Abhishek Agashe
Master's Projects
According to Government Computer News (GCN) web attacks have been marked as all- time high this year. GCN says that some of the leading security software like SOPHOS detected about 15,000 newly infected web pages daily in initial three months of 2008 [13]. This has lead to the need of efficient software to make web applications robust and sustainable to these attacks. While finding information on different types of attacks, I found that SQL injection and cross site scripting are the most famous among attackers. These attacks are used extensively since, they can be performed using different techniques and it …
Sql Injection Analysis, Detection And Prevention, Jagdish Halde
Sql Injection Analysis, Detection And Prevention, Jagdish Halde
Master's Projects
Web sites are dynamic, static, and most of the time a combination of both. Web sites need protection in their database to assure security. An SQL injection attacks interactive web applications that provide database services. These applications take user inputs and use them to create an SQL query at run time. In an SQL injection attack, an attacker might insert a malicious SQL query as input to perform an unauthorized database operation. Using SQL injection attacks, an attacker can retrieve or modify confidential and sensitive information from the database. It may jeopardize the confidentiality and security of Web sites which …
Efficient Resource Management Mechanism For 802.16 Wireless Networks Based On Weighted Fair Queuing, Kiran Rangula
Efficient Resource Management Mechanism For 802.16 Wireless Networks Based On Weighted Fair Queuing, Kiran Rangula
Master's Projects
Wireless Networking continues on its path of being one of the most commonly used means of communication. The evolution of this technology has taken place through the design of various protocols. Some common wireless protocols are the WLAN, 802.16 or WiMAX, and the emerging 802.20, which specializes in high speed vehicular networks, taking the concept from 802.16 to higher levels of performance. As with any large network, congestion becomes an important issue. Congestion gains importance as more hosts join a wireless network. In most cases, congestion is caused by the lack of an efficient mechanism to deal with exponential increases …
Design & Evaluation Of Path-Based Reputation System For Manet Routing, Ji Li
Design & Evaluation Of Path-Based Reputation System For Manet Routing, Ji Li
Master's Projects
Most of the existing reputation systems in mobile ad hoc networks (MANET) consider only node reputations when selecting routes. Reputation and trust are therefore generally ensured within a one-hop distance when routing decisions are made, which often fail to provide the most reliable, trusted route. In this report, we first summarize the background studies on the security of MANET. Then, we propose a system that is based on path reputation, which is computed from reputation and trust values of each and every node in the route. The use of path reputation greatly enhances the reliability of resulting routes. The detailed …
A Comparative Xeon And Cbe Performance Analysis, Randy Fort
A Comparative Xeon And Cbe Performance Analysis, Randy Fort
Master's Projects
The Cell Broadband Engine is a high performance multicore processor with superb performance on certain types of problems. However, it does not perform as well running other algorithms, particularly those with heavy branching. The Intel Xeon processor is a high performance superscalar processor. It utilizes a high clock speed and deep pipelines to help it achieve superior performance. But deep pipelines can perform poorly with frequent memory accesses. This paper is a study and attempt at quantifying the types of programmatic structures that are more suitable to a particular architecture. It focuses on the issues of pipelines, memory access and …
The Prosody Of Uncertainty For Spoken Dialogue Intelligent Tutoring Systems, Bevan Jones
The Prosody Of Uncertainty For Spoken Dialogue Intelligent Tutoring Systems, Bevan Jones
Master's Projects
The speech medium is more than an audio conveyance of word strings. It contains meta information about the content of the speech. The prosody of speech, pauses and intonation, adds an extra dimension of diagnostic information about the quality of a speaker's answers, suggesting an important avenue of research for spoken dialogue tutoring systems. Tutoring systems that are sensitive to such cues may employ different tutoring strategies based on detected student uncertainty, and they may be able to perform more precise assessment of the area of student difficulty. However, properly identifying the cues can be challenging, typically requiring thousands of …
Exact And Approximation Algorithms For Computing Reversal Distances In Genome Rearrangement, Euna Park
Exact And Approximation Algorithms For Computing Reversal Distances In Genome Rearrangement, Euna Park
Master's Projects
Genome rearrangement is a research area capturing wide attention in molecular biology. The reversal distance problem is one of the most widely studied models of genome rearrangements in inferring the evolutionary relationship between two genomes at chromosome level. The problem of estimating reversal distance between two genomes is modeled as sorting by reversals. While the problem of sorting signed permutations can have polynomial time solutions, the problem of sorting unsigned permutations has been proven to be NP-hard [4]. This work introduces an exact greedy algorithm for sorting by reversals focusing on unsigned permutations. An improved method of producing cycle decompositions …
Bibliography Data Mining And Data Visualization, Deepthi Pullannagari
Bibliography Data Mining And Data Visualization, Deepthi Pullannagari
Master's Projects
Data mining is a concept of discovering meaningful patterns from large data repositories, and Data visualization is a graphical representation of data using shapes, colors and images for a better conceptualization. These two techniques have been in use for a long time now and are used together in number of fields to gain a better perception of the data. Bibliographic data is widely used in academic and scientific literature fields and this project deals with data mining and data visualization of bibliographic data downloaded from Citeseer Citation Indexing system. The downloaded metadata is extracted into the database, looking for patterns …
Firefox Extension To Add Contacts, Events, And View Addresses, Vijay Rao
Firefox Extension To Add Contacts, Events, And View Addresses, Vijay Rao
Master's Projects
Users of the Firefox browser have the ability to download plugins to manage their contacts. This usually involves typing or copying the details from some source to add contacts. Event and meeting invitations are sent by mail and are added to the user’s calendar once the user accepts the invitation. Users viewing address data on websites are limited to the mapping capabilities provided by the webpage viewed by the user. We developed a Firefox extension that allows the user to select portions of text with contact or event information and add it as a contact or an event in the …
Online Collaborative Time Management System Using Artificial Intelligence, Anand Sivaramakrishnan
Online Collaborative Time Management System Using Artificial Intelligence, Anand Sivaramakrishnan
Master's Projects
Online Collaborative Time Management System is a system that will plan events and help achieve goals intelligently using Partial Order Planning. This product is similar to a social networking site, which plans events for collaborative set of people. For this masters’ project, such a system is developed. Our site allows multiple people to add items to a collaborative To-Do list. The user interface for our site allows people to add actions and preconditions to the existing system, enabling the system to grow constantly. In order to generate a sequence of actions to the most complex problems, partial order generators are …
Online Visualization Of Bibliography Using Visualization Techniques, Bharath Kumar Manur Venkataramana
Online Visualization Of Bibliography Using Visualization Techniques, Bharath Kumar Manur Venkataramana
Master's Projects
Visualization is a concept where we can represent some raw data in the form of graphs, images, charts, etc. which will be very helpful for the end-user to correlate and be able to understand the relationships between the data elements in a single screen. Representing the bibliographic information of the computer science journals and proceedings using Visualization technique would help user choose a particular author and navigate through the hierarchy and find out what papers the author has published, the keywords of the papers, what papers cite them, the co-authors along with the main author, and how many papers are …
Adaptive Software Transactional Memory: Dynamic Contention Management, Joel Frank
Adaptive Software Transactional Memory: Dynamic Contention Management, Joel Frank
Master's Projects
This thesis addresses the problem of contention management in Software Transactional Memory (STM), which is a scheme for managing shared memory in a concurrent programming environment. STM views shared memory in a way similar to that of a database; read and write operations are handled through transactions, with changes to the shared memory becoming permanent through commit operations. Research on this subject reveals that there are currently varying methods for collision detection, data validation, and contention management, each of which has different situations in which they become the preferred method. This thesis introduces a dynamic contention manager that monitors current …
Online Recommendation System, Ankit Khera
Online Recommendation System, Ankit Khera
Master's Projects
The vast amount of data available on the Internet has led to the development of recommendation systems. This project proposes the use of soft computing techniques to develop recommendation systems. It addresses the limitations of current algorithms used to implement recommendation systems, evaluation of experimental results, and conclusion. This report provides a detailed summary of the project “Online Recommendation System” as part of fulfillment of the Master's Writing Project, Computer Science Department, San Jose State University’s. The report includes a description of the topic, system architecture, and provides a detailed description of the work done till point. Included in the …
Dna Fragment Assembly Algorithms: Toward A Solution For Long Repeats, Ching Li
Dna Fragment Assembly Algorithms: Toward A Solution For Long Repeats, Ching Li
Master's Projects
In this work, we describe our efforts to seek optimal solutions for the DNA Fragment Assembly Problem in terms of assembly accuracy and runtime efficiency. The main obstacles for the DNA Fragment Assembly are analyzed. After reviewing various advanced algorithms adopted by some assemblers in the bioinformatics industry, this work explores the feasibility of assembling fragments for a target sequence containing perfect long repeats, which is deemed theoretically impossible without tedious finishing reaction experiments. Innovative algorithms incorporating statistical analysis proposed in this work make the restoration of DNA sequences containing long perfect repeats an attainable goal.
Fuzzy Content Mining For Targeted Advertisement, Yezhou Wang
Fuzzy Content Mining For Targeted Advertisement, Yezhou Wang
Master's Projects
Content-targeted advertising system is becoming an increasingly important part of the funding source of free web services. Highly efficient content analysis is the pivotal key of such a system. This project aims to establish a content analysis engine involving fuzzy logic that is able to automatically analyze real user-posted Web documents such as blog entries. Based on the analysis result, the system matches and retrieves the most appropriate Web advertisements. The focus and complexity is on how to better estimate and acquire the keywords that represent a given Web document. Fuzzy Web mining concept will be applied to synthetically consider …
Fuzzy Range Query In Xml, Dexiong Zhang
Fuzzy Range Query In Xml, Dexiong Zhang
Master's Projects
This writing project presents a new approach to implement a fuzzy range query solution for retrieving Extensible Markup Language (XML) data. Ever since XML was introduced, it has become a web standard to describe data on the Internet. The need for performing range query against XML data is growing day by day. Many search service providers are eager to improve their solutions on range query against XML data. The project studies and analyzes the limitations on the current range query solutions. The project also proposes a new solution using fuzzy semantic analysis to quantify XML data so that it can …
Finding Molecular Complexes Through Multiple Layer Clustering Of Protein Interaction Networks, Bill Andreopoulos, Aijun An, Xiangji Huang, Xiaogang Wang
Finding Molecular Complexes Through Multiple Layer Clustering Of Protein Interaction Networks, Bill Andreopoulos, Aijun An, Xiangji Huang, Xiaogang Wang
Faculty Publications, Computer Science
Clustering protein-protein interaction networks (PINs) helps to identify complexes that guide the cell machinery. Clustering algorithms often create a flat clustering, without considering the layered structure of PINs. We propose the MULIC clustering algorithm that produces layered clusters. We applied MULIC to five PINs. Clusters correlate with known MIPS protein complexes. For example, a cluster of 79 proteins overlaps with a known complex of 88 proteins. Proteins in top cluster layers tend to be more representative of complexes than proteins in bottom layers. Lab work on finding unknown complexes or determining drug effects can be guided by top layer proteins.
A Multiple-Copy Scheme For Multi-Channel Stop-And-Wait Harq, Yucheng Shih
A Multiple-Copy Scheme For Multi-Channel Stop-And-Wait Harq, Yucheng Shih
Master's Projects
HARQ (Hybrid Automatic Repeat Request) combines ARQ (Automatic Repeat Request) with FEC (Forward Error Correction) to provide a reliable way to ensure that data are received correctly and in sequence. A multiple-copy HARQ scheme is proposed for WiMAX (Worldwide Interoperability for Microwave Access) to reduce the waiting time of erroneously received data in the receivers’ buffer. In this project, the performances of WiMAX multi-channel stop-and-wait HARQ scheme are compared with that of the proposed multiple-copy HARQ scheme. The multiple-copy HARQ can send the same copy of a data burst on contiguous channels during noisy channel conditions so that the required …
A Hierarchical Trusted Third-Party System For Secure Peer-To-Peer Transactions, Khoi Nguyen
A Hierarchical Trusted Third-Party System For Secure Peer-To-Peer Transactions, Khoi Nguyen
Master's Projects
A peer-to-peer (P2P) network is a distributed network of peer computers loosely connected through the Internet. Transactions in a P2P network are often conducted on a no-security basis. Moreover, peer anonymity is often highly desirable, which makes security even more difficult to achieve. In most cases, a peer executes a transaction solely based on the faith that the other peer plays by the rules. Here we propose a hierarchical Trusted Third-Party (TTP) system that facilitates secure transactions between peers in an existing P2P network. This system is designed to provide mutual authentication by using public key cryptography for peers to …