University of Texas

Displaying 1-40 of 325 results

  • White Papers // Jun 2013

    Graduates' Perception of Employment in SMEs and Large Enterprises

    This paper looks at non business (n = 66) and business graduates (n = 18) and compares their employment preference in Small and Medium sized Enterprises (SME) or Large Enterprises (LE). In pursuit, a questionnaire was developed measuring the perception of graduates as regards on the content of a job,...

    Provided By University of Texas

  • White Papers // Aug 2012

    Offloading in Heterogeneous Networks: Modeling, Analysis and Design Insights

    Pushing data traffic from cellular to Wi-Fi is an example of inter-Radio Access Technology (RAT) offloading. While this clearly alleviates congestion on the over-loaded cellular network, the ultimate potential of such offloading and its effect on overall system performance is not well understood. To address this, the authors develop a...

    Provided By University of Texas

  • White Papers // Jul 2012

    Frankenstein: Stitching Malware From Benign Binaries

    This paper proposes a new self-camouflaging malware propagation system, Frankenstein, that overcomes shortcomings in the current generation of metamorphic malware. Specifically, although mutants produced by current state-of-the-art metamorphic engines are diverse, they still contain many characteristic binary features that reliably distinguish them from benign software. Frankenstein forgoes the concept of...

    Provided By University of Texas

  • White Papers // Jun 2012

    New Proof Methods for Attribute-Based Encryption: Achieving Full Security Through Selective Techniques

    The authors develop a new methodology for utilizing the prior techniques to prove selective security for functional encryption systems as a direct ingredient in devising proofs of full security. This deepens the relationship between the selective and full security models and provides a path for transferring the best qualities of...

    Provided By University of Texas

  • White Papers // May 2012

    Dependency Path Patterns as the Foundation of Access Control in Provenance-Aware Systems

    A unique characteristics of provenance data is that it forms a Directed Acyclic Graph (DAG) in accordance with the underlying causality dependencies between entities (acting users, action processes and data objects) involved in transactions. Data provenance raises at least two distinct security-related issues. One is how to control access to...

    Provided By University of Texas

  • White Papers // May 2012

    Tag-Based Information Flow Analysis for Document Classification in Provenance

    A crucial aspect of certain applications such as the ones pertaining to Intelligence domain or Health-care, is to manage and protect sensitive information effectively and efficiently. In this paper, the authors propose a tagging mechanism to track the flow of sensitive or valuable information in a provenance graph and automate...

    Provided By University of Texas

  • White Papers // May 2012

    AnonymousCloud: A Data Ownership Privacy Provider Framework in Cloud Computing

    A means of reliably concealing ownership of cloud data without impeding computation over the data is presented and evaluated. This facilitates information privacy enforcement in cloud environments by withholding data ownership information from cloud nodes that compute using the data. As a result, nodes that have access to private data...

    Provided By University of Texas

  • White Papers // May 2012

    Dual Form Signatures: An Approach for Proving Security From Static Assumptions

    In this paper, the authors introduce the abstraction of Dual Form Signatures as a useful framework for proving security (existential unforgeability) from static assumptions for schemes with special structure that are used as a basis of other cryptographic protocols and applications. They describe the power of this framework by proving...

    Provided By University of Texas

  • White Papers // May 2012

    Hatman: Intra-Cloud Trust Management for Hadoop

    Data and computation integrity and security are major concerns for users of cloud computing facilities. Many production-level clouds optimistically assume that all cloud nodes are equally trustworthy when dispatching jobs; jobs are dispatched based on node load, not reputation. This increases their vulnerability to attack, since compromising even one node...

    Provided By University of Texas

  • White Papers // Apr 2012

    An Empirical Study of Supplementary Bug Fixes

    A recent study finds that errors of omission are harder for programmers to detect than errors of commission. While several change recommendation systems already exist to prevent or reduce omission errors during software development, there have been very few studies on why errors of omission occur in practice and how...

    Provided By University of Texas

  • White Papers // Apr 2012

    Towards Understanding the Fundamentals of Mobility in Cellular Networks

    Despite the central role of mobility in wireless networks, there are surprisingly few fundamental results on its properties. This paper aims to address this gap by proposing a new Random Way-Point (RWP) mobility model defined on the entire plane and applying it to analyze two key cellular network parameters: handover...

    Provided By University of Texas

  • White Papers // Apr 2012

    Vdiff: A Program Differencing Algorithm for Verilog Hardware Description Language

    During code review tasks, comparing two versions of a hardware design description using existing program differencing tools such as diff is inherently limited because these tools implicitly assume sequential execution semantics, while hardware description languages are designed to model concurrent computation. The authors designed a position-independent differencing algorithm to robustly...

    Provided By University of Texas

  • White Papers // Apr 2012

    BRACE: An Assertion Framework for Debugging Cyber-Physical Systems

    Developing Cyber-Physical Systems (CPS) is challenging because correctness depends on both logical and physical states, which are collectively difficult to observe. The developer often need to repeatedly rerun the system while observing its behavior and tweak the hardware and software until it meets minimum requirements. This process is tedious, error-prone,...

    Provided By University of Texas

  • White Papers // Apr 2012

    Extending Java for Android Programming

    Android is one of the most popular platforms for developing mobile applications. However, its framework relies on programming conventions and styles to implement framework-specific concepts like activities and intents, causing problems such as reliability, readability, understandability, and maintainability. The authors propose to extend Java to support Android framework concepts explicitly...

    Provided By University of Texas

  • White Papers // Feb 2012

    A-Serv: A Novel Architecture Providing Scalable Quality of Service

    QoS architectures define how routers process packets to ensure QoS service guarantees enforced. Existing QoS architectures such as Integrated Services (IntServ), Differentiated Services (DiffServ), and Dynamic Packet State (DPS) share one common property that the packet structure and the function of the routers are closely connected. Packets of one data...

    Provided By University of Texas

  • White Papers // Feb 2012

    Security Analysis and Enhancement for Prefix-Preserving Encryption Schemes

    Prefix-Preserving Encryption (PPE) is an important type of encryption scheme, having a wide range of applications, such as IP addresses anonymization, prefix-matching search, and rang search. There are two issues in PPE schemes, security proof and single key requirement. Existing security proofs for PPE only reduce the security of a...

    Provided By University of Texas

  • White Papers // Feb 2012

    Decoupled Dynamic Cache Segmentation

    The Least Recently Used (LRU) replacement policy performs poorly in the Last-Level Cache (LLC) because temporal locality of memory accesses is filtered by first and second level caches. The authors propose a cache segmentation technique that dynamically adapts to cache access patterns by predicting the best number of not-yet-referenced and...

    Provided By University of Texas

  • White Papers // Jan 2012

    Identifying Failure-Inducing Combinations in a Combinatorial Test Set

    A t-way combinatorial test set is designed to detect failures that are triggered by combinations involving no more than t parameters. Assume that the authors have executed a t-way test set and some tests have failed. A natural question to ask is: what combinations have caused these failures? Identifying such...

    Provided By University of Texas

  • White Papers // Jan 2012

    Optimal Surface Deployment Problem in Wireless Sensor Networks

    Sensor deployment is a fundamental issue in a wireless sensor network, which often dictates the overall network performance. Previous studies on sensor deployment mainly focused on sensor networks on 2D plane or in 3D volume. In this paper, the authors tackle the problem of optimal sensor deployment on 3 surfaces,...

    Provided By University of Texas

  • White Papers // Jan 2012

    Detecting Dangerous Queries: A New Approach for Chosen Ciphertext Security

    The authors present a new approach for creating chosen ciphertext secure encryption. The focal point of their work is a new abstraction that they call Detectable Chosen Ciphertext Security (DCCA). Intuitively, this notion is meant to capture systems that are not necessarily Chosen Ciphertext Attack (CCA) secure, but where they...

    Provided By University of Texas

  • White Papers // Jan 2012

    XML Query Routing in Structured P2P Systems

    This paper addresses the problem of data placement, indexing, and querying large XML data repositories distributed over an existing P2P service infrastructure. The authors' architecture scales gracefully to the network and data sizes, is fully distributed, fault tolerant and self-organizing, and handles complex queries efficiently, even those queries that use...

    Provided By University of Texas

  • White Papers // Jan 2012

    A Lightweight Algorithm for Causal Message Ordering in Mobile Computing Systems

    Causally ordered message delivery is a required property for several distributed applications particularly those that involve human interactions (such as teleconferencing and collaborative work). In this paper, the authors present an efficient protocol for causal ordering in mobile computing systems. This protocol requires minimal resources on mobile hosts and wireless...

    Provided By University of Texas

  • White Papers // Dec 2011

    Making Argument Systems for Outsourced Computation Practical (Sometimes)

    This paper describes the design, implementation, and evaluation of a system for performing verifiable outsourced computation. It has long been known that this problem can be solved in theory using Probabilistically Checkable Proofs (PCPs) coupled with modern cryptographic tools, and these solutions have wholly impractical performance, according to the conventional...

    Provided By University of Texas

  • White Papers // Nov 2011

    Heterogeneous Cellular Networks: From Theory to Practice

    The proliferation of internet-connected mobile devices will continue to drive growth in data traffic in an exponential fashion, forcing network operators to dramatically increase the capacity of their networks. To do this cost-effectively, a paradigm shift in cellular network infrastructure deployment is occurring away from traditional (expensive) high-power tower-mounted base...

    Provided By University of Texas

  • White Papers // Nov 2011

    Efficient Similarity Search Over Encrypted Data

    In recent years, due to the appealing features of cloud computing, large amount of data have been stored in the cloud. Although cloud based services offer many advantages, privacy and security of the sensitive data is a big concern. To mitigate the concerns, it is desirable to outsource sensitive data...

    Provided By University of Texas

  • White Papers // Nov 2011

    Insider Threat Detection Using Stream Mining and Graph Mining

    Evidence of malicious insider activity is often buried within large data streams, such as system logs accumulated over months or years. Ensemble-based stream mining leverages multiple classification models to achieve highly accurate anomaly detection in such streams even when the stream is unbounded, evolving, and unlabeled. This makes the approach...

    Provided By University of Texas

  • White Papers // Nov 2011

    Program Interferometry

    Modern microprocessors have many micro-architectural features. Quantifying the performance impact of one feature such as dynamic branch prediction can be difficult. On one hand, a timing simulator can predict the difference in performance given two different implementations of the technique, but simulators can be quite inaccurate. On the other hand,...

    Provided By University of Texas

  • White Papers // Nov 2011

    Functional Verification of Class Invariants in CleanJava

    In Cleanroom-style functional program verification, a program is viewed as a mathematical function from one program state to another, and the program is verified by comparing two functions, the implemented and the expected behaviors of a program. The technique requires a minimal mathematical background and supports forward reasoning, but it...

    Provided By University of Texas

  • White Papers // Oct 2011

    An Optimized Scaled Neural Branch Predictor

    Conditional branch prediction remains one of the most important enabling technologies for high-performance microprocessors. A small improvement in accuracy can result in a large improvement in performance as well as a significant reduction in energy wasted on wrong-path instructions. Neural-based branch predictors have been among the most accurate in the...

    Provided By University of Texas

  • White Papers // Sep 2011

    Transmission Capacity of Ad-Hoc Networks With Multiple Antennas Using Transmit Stream Adaptation and Interference Cancelation

    The transmission capacity of an ad-hoc network is the maximum density of active transmitters per unit area, given an outage constraint at each receiver for a fixed rate of transmission. Assuming that the transmitter locations are distributed as a Poisson point process, this paper derives upper and lower bounds on...

    Provided By University of Texas

  • White Papers // Sep 2011

    Supervised Learning for Insider Threat Detection Using Stream Mining

    Insider threat detection requires the identification of rare anomalies in contexts where evolving behaviors tend to mask such anomalies. This paper proposes and tests an ensemble-based stream mining algorithm based on supervised learning that addresses this challenge by maintaining an evolving collection of multiple models to classify dynamic data streams...

    Provided By University of Texas

  • White Papers // Sep 2011

    Toward the Verification of a Simple Hypervisor

    Virtualization promises significant benefits in security, efficiency, dependability, and cost. Achieving these benefits depends upon the reliability of the underlying virtual machine monitors (hypervisors). This paper describes an ongoing project to develop and verify MinVisor, a simple but functional Type-I x86 hypervisor, proving protection properties at the assembly level using...

    Provided By University of Texas

  • White Papers // Sep 2011

    AOVis: A Model-Driven Multiple-Graph Approach to Program Fact Extraction for AspectJ/Java Source Code

    AspectJ reverse engineering and visualization remains a challenge at the architectural and design levels, with fewer tools available for reverse engineers compared to other languages such as Java. Prior work on AspectJ modeling focused on forward engineering or detailed-design reverse engineering, or required special instrumentation to identify cross-cutting relationships. Effective...

    Provided By University of Texas

  • White Papers // Aug 2011

    Remote Batch Invocation for SQL Databases

    Batch services are a new approach to distributed computation in which clients send batches of operations for execution on a server and receive hierarchical results sets in response. In this paper, the authors show how batch services provide a simple and powerful interface to relational databases, with support for arbitrary...

    Provided By University of Texas

  • White Papers // Aug 2011

    The CleanJava Language for Functional Program Verification

    Unlike Hoare-style program verification, functional program verification supports forward reasoning by viewing a program as a mathematical function from one program state to another and proving its correctness by essentially comparing two mathematical functions, the function computed by the program and its specification. Since it requires a minimal mathematical background...

    Provided By University of Texas

  • White Papers // Aug 2011

    A Tutorial on Functional Program Verification

    This paper gives a quick tutorial introduction to functional program verification. In functional program verification, a program is viewed as a mathematical function from one program state to another, and proving its correctness is essentially comparing two mathematical functions, the function computed by the program and the specification of the...

    Provided By University of Texas

  • White Papers // Jul 2011

    Distributed SIR-Aware Scheduling in Large-Scale Wireless Networks

    Opportunistic scheduling and routing can in principle greatly increase the throughput of decentralized wireless networks, but to be practical such algorithms must do so with small amounts of timely side information. In this paper, the authors propose three related techniques for low-overhead Distributed Opportunistic Scheduling (DOS) and precisely determine their...

    Provided By University of Texas

  • White Papers // Jul 2011

    Heterogeneous Cellular Networks With Flexible Cell Association: A Comprehensive Downlink SINR Analysis

    In this paper, the authors develop a tractable framework for SINR analysis in downlink Heterogeneous Cellular Networks (HCNs) with flexible cell association policies. The HCN is modeled as a multi-tier cellular network where each tier's Base Stations (BSs) are randomly located and have a particular transmit power, path loss exponent,...

    Provided By University of Texas

  • White Papers // Jul 2011

    Capacity Bounds on Multiuser MIMO Transmission in Random Wireless Networks

    The authors consider a large wireless ad hoc network in which each multi-antenna transmitting node sends multiple independent streams to different receivers in a Poisson field of interferers. They provide exact expressions and simplified approximations on the outage probability, contention density, and transmission capacity for dirty paper coding with perfect...

    Provided By University of Texas

  • White Papers // Jul 2011

    Multiuser Zero-Forcing Beamforming With Limited Feedback in Wireless Ad Hoc Networks

    The effect of limited feedback on point-to-multipoint communication is investigated in multi-antennas wireless ad hoc networks. The authors consider zero-forcing beamforming with quantized channel direction information and derive new closed-form expressions for the outage probability, throughput, transmission capacity, and average user rate. Expressions for the performance degradation due to finite...

    Provided By University of Texas

  • White Papers // Dec 2008

    Multi-Path Planning for Mobile Element to Prolong the Lifetime of Wireless Sensor Networks

    Mobile elements, which can traverse the deployment area and convey the observed data from static sensor nodes to a base station, have been introduced for energy efficient data collection in Wireless Sensor Networks (WSNs). However, most existing solutions only plan a single path for the mobile element, which may lead...

    Provided By University of Texas

  • White Papers // Mar 2011

    Secure Friend Discovery in Mobile Social Networks

    Mobile social networks extend social networks in the cyberspace into the real world by allowing mobile users to discover and interact with existing and potential friends who happen to be in their physical vicinity. Despite their promise to enable many exciting applications, serious security and privacy concerns have hindered wide...

    Provided By University of Texas

  • White Papers // Jun 2011

    XML Query Optimization in Map-Reduce

    The authors present a novel query language for large-scale analysis of XML data on a map-reduce environment, called MRQL, that is expressive enough to capture most common data analysis tasks and at the same time is amenable to optimization. The authors' evaluation plans are constructed using a small number of...

    Provided By University of Texas

  • White Papers // Dec 2010

    Hybrid Partial Evaluation

    The authors present Hybrid Partial Evaluation (HPE), a pragmatic approach to partial evaluation that borrows ideas from both online and offline partial evaluation. HPE performs offline-style specialization using an online approach without static binding time analysis. The goal of HPE is to provide a practical and predictable level of optimization...

    Provided By University of Texas

  • White Papers // Jan 2011

    Programming Many-Core Architectures - A Case Study: Dense Matrix Computations on the Intel SCC Processor

    A message passing, distributed-memory parallel computer on a chip is one possible design for future, many-core architectures. The authors discuss initial experiences with the Intel Single-chip Cloud Computer research processor, which is a prototype architecture that incorporates 48 cores on a single die that can communicate via a small, shared,...

    Provided By University of Texas

  • White Papers // Feb 2011

    Is That You? Authentication in a Network Without Identities

    Most networks require that their users have "Identities", i.e. have names that are fixed for a relatively long time, unique, and have been approved by a central authority (in order to guarantee their uniqueness). Unfortunately, this requirement, which was introduced to simplify the design of networks, has its own drawbacks....

    Provided By University of Texas

  • White Papers // Mar 2011

    TPP: The Two-Way Password Protocol

    The need for secure communication in the Internet has led to the widespread deployment of secure application-level protocols. The current state-of-the-art is to use TLS, in conjunction with a password protocol. The password protocol, which the authors call a One-way Password Protocol (OPP), authenticates the client to the server, using...

    Provided By University of Texas

  • White Papers // Apr 2011

    The K-Observer Problem in Computer Networks

    For any non-negative integer K, a K-observer P of a network N is a set of nodes in N such that each message, that travels at least K hops in N, is handled (and so observed) by at least one node in P. A K-observer P of a network N...

    Provided By University of Texas

  • White Papers // Apr 2011

    Mechanizing the Expert Dense Linear Algebra Developer

    Sustained high performance on the fastest computers in the world has traditionally been accomplished by experts who carefully hand-code key routines. This quickly becomes unmanageable for large bodies of software and/or as architectures change enough that entire libraries need to be rewritten. The authors believe the problem is that a...

    Provided By University of Texas

  • White Papers // May 2011

    Regret-Freedom Isn't Free

    Cooperative, Peer-To-Peer (P2P) services-distributed systems consisting of participants from Multiple Administrative Domains (MAD)|must deal with the threat of arbitrary (Byzan-tine) failures while incentivizing the cooperation of potentially selfish (rational) nodes that such services rely on to function. Although previous work has generally agreed that these types of participants need to...

    Provided By University of Texas

  • White Papers // May 2011

    Consistency, Availability, and Convergence

    The authors examine the limits of consistency in fault-tolerant distributed storage systems. In particular, they identify fundamental tradeoffs among properties of consistency, availability, and convergence, and the authors close the gap between what is known to be impossible (i.e. CAP) and known systems that are highly-available but that provide weaker...

    Provided By University of Texas

  • White Papers // Jan 2011

    Using Valgrind to Detect Undefined Value Errors With Bit-Precision

    The authors present Memcheck, a tool that has been implemented with the dynamic binary instrumentation framework Valgrind. Memcheck detects a wide range of memory errors in programs as they run. This paper focuses on one kind of error that Memcheck detects: undefined value errors. Such errors are common, and often...

    Provided By University of Texas

  • White Papers // Jan 2011

    DRES: Dynamic Range Encoding Scheme for TCAM Coprocessors

    One of the most critical resource management issues in the use of Ternary Content Addressable Memory (TCAM) for packet classification/filtering is how to effectively support filtering rules with ranges, known as range matching. In this paper, a Dynamic Range Encoding Scheme (DRES) is proposed to significantly improve TCAM storage efficiency...

    Provided By University of Texas

  • White Papers // Jan 2010

    International Protection Of Intellectual Property: A Quantitative Assessment

    The strength of Intellectual Property Right (IPR) protection varies across countries and these differences have persisted across time. In this paper, the author builds a multi-country dynamic model where governments choose IPR policies each period. The author uses country heterogeneity in education, population, and bilateral trade costs to induce IPR...

    Provided By University of Texas

  • White Papers // Jun 2011

    3G Meets the Internet: Understanding the Performance of Hierarchical Routing in 3G Networks

    The volume of Internet traffic over 3G wireless networks is sharply rising. In contrast to many Internet services utilizing replicated resources, such as Content Distribution Networks (CDN), the current 3G standard architecture employs hierarchical routing, where all user data traffic goes through a small number of aggregation points using logical...

    Provided By University of Texas

  • White Papers // Jul 2010

    Wi-HTest: Compliance Test Tool for Real-Time WirelessHART Mesh Network Devices

    WirelessHART was released in September 2007 and became IEC standard in April 2010 (IEC 62591). It is the first open wireless communication standard specifically designed for real-time process control applications. It is designed to the same standard as its wired counterpart for reliability and interoperability. To ensure the compliance with...

    Provided By University of Texas

  • White Papers // Aug 2010

    Greedy Distance Vector Routing

    Greedy Distance Vector (GDV) is the first geographic routing protocol designed to optimize end-to-end path costs using any additive routing metric, such as: hop count, latency, ETX, ETT, etc. GDV requires no node location information. Instead, GDV uses estimated routing costs to destinations which are locally computed from node positions...

    Provided By University of Texas

  • White Papers // Dec 2009

    Passive Network-Awareness for Dynamic Resource-Constrained Networks

    As computing devices and their users become increasingly mobile, the demand for information about the environment, or context, becomes of significant importance. Applications must be able to adapt themselves to the changing environment to satisfy users' demands and to ensure that the application's resource usage matches the environment's capabilities. However,...

    Provided By University of Texas

  • White Papers // Jan 2010

    Supporting Multi-Fidelity-Aware Concurrent Applications in Dynamic Sensor Networks

    Most existing research in wireless sensor networks focuses on optimally running a single application on top of a tailor-made and deployed network. However, as sensors become an integral part of the environments, the authors posit that sensor networks will be increasingly viewed as platforms that will be used to run...

    Provided By University of Texas

  • White Papers // Feb 2010

    MaDMAN: A Middleware for Delay-Tolerant Mobile Ad-Hoc Networks

    As Delay-Tolerant Networks (DTNs), dynamic networks in which nodes are not always connected to one another, gain traction in both the research community and in real-world deployments, research must explore how DTN protocols can coexist with traditional mobile ad-hoc networking protocols. This is a requirement for future deployments in which...

    Provided By University of Texas

  • White Papers // Feb 2010

    Usability of Semantic Web for Enhancing Digital Living Experience

    The number of different types of devices on the home network is expanding rapidly. While this explosion of innovation provides compelling new devices to consumers, there are challenges ensuring compatibility among these devices and providing a comprehensive user interface that supports consumers managing their digital content across several devices. The...

    Provided By University of Texas

  • White Papers // Mar 2010

    Application Sessions: Conversation Abstractions for Pervasive Computing

    Pervasive computing application development demands abstractions that reify the notion of a conversation among distributed entities in dynamic and unpredictable environments. The authors define the Application Sessions model for representing and managing long-term conversations on behalf of applications. This model has been designed to remove the application developer's need for...

    Provided By University of Texas

  • White Papers // Aug 2010

    The Case for End-User Programming of Ubiquitous Computing Environments

    Gone are the days that computers will be used by select users sitting at a desk with a mouse and keyboard. The next wave of computing, ubiquitous computing, is upon one. With smart phones, tablet computers, and embedded sensors/ actuators ourishing, users are already interacting with dozens of computers per...

    Provided By University of Texas

  • White Papers // Sep 2010

    The Click Convergence Layer: Putting a Modular Router Under DTN2

    The Bundle Protocol shows great promise as a general purpose application-layer protocol for Delay-Tolerant Networks (DTNs) and has found many adopters within the research community. As an application layer protocol, a convergence layer (UDP/TCP sockets or some other domain-specific transport mechanism) is required to deliver bundles between nodes. The authors...

    Provided By University of Texas

  • White Papers // Jun 2009

    Towards Adaptive Resource-Driven Routing

    In pervasive computing environments, applications find themselves in constantly changing operating conditions. Such applications often need to discover locally available resources on-demand. Communication protocols have been developed that base discovery not on the unique address of the destination but on application-level characteristics of the destination host. Previous work has focused...

    Provided By University of Texas

  • White Papers // Nov 2009

    Investigating the Performance of Various Vocoders for a Fair Scheduling Algorithm in WiMax

    IEEE 802.16e, a broadband wireless access technology that provides high speed internet access and multimedia services has seen very significant growth in recent times. With the due rapid deployment of WiMAX, there would be a growing demand for efficient support of voice applications. The performance of Voice over IP services...

    Provided By University of Texas

  • White Papers // Aug 2010

    Objective Risk Evaluation for Automated Security Management

    Network security depends on a number of factors. And a common characteristic of these factors is that they are dynamic in nature. Such factors include new vulnerabilities and threats, the network policy structure and traffic. These factors can be divided into two broad categories. Network risk and service risk. As...

    Provided By University of Texas

  • White Papers // Feb 2011

    Synthesizing Concurrent Schedulers for Irregular Algorithms

    Scheduling is the assignment of tasks or activities to processors for execution, and it is an important concern in parallel programming. Most prior work on scheduling has focused either on static scheduling of applications in which the dependence graph is known at compile-time or on dynamic scheduling of independent loop...

    Provided By University of Texas

  • White Papers // Dec 2010

    Parallel Graph Partitioning on Multicore Architectures

    Graph partitioning is a common and frequent preprocessing step in many high-performance parallel applications on distributed and shared-memory architectures. It is used to distribute graphs across memory and to improve spatial locality. There are several parallel implementations of graph partitioning for distributed-memory architectures. In this paper, the authors present a...

    Provided By University of Texas

  • White Papers // Oct 2008

    Network Imprecision: A New Consistency Metric for Scalable Monitoring

    This paper introduces a new consistency metric, Network Imprecision (NI), to address a central challenge in large-scale monitoring systems: Safeguarding accuracy despite node and network failures. To implement NI, an overlay that monitors a set of attributes also monitors its own state so that queries return not only attribute values...

    Provided By University of Texas

  • White Papers // Aug 2008

    Stale-Safe Security Properties for Group-Based Secure Information Sharing

    Attribute staleness arises due to the physical distribution of authorization information, decision and enforcement points. This is a fundamental problem in virtually any secure distributed system in which the management and representation of authorization state is not centralized. This problem is so intrinsic, it is inevitable that access control will...

    Provided By University of Texas

  • White Papers // Aug 2009

    Using Dead Blocks as a Virtual Victim Cache

    Caches mitigate the long memory latency that limits the performance of modern processors. However, caches can be quite inefficient. On average, a cache block in a 2MB L2 cache is dead 59% of the time, i.e., it will not be referenced again before it is evicted. Increasing cache efficiency can...

    Provided By University of Texas

  • White Papers // Jul 2009

    Batch Forwarding in Wireless Sensor Networks

    Batch processing is a well-known concept in computer science and widely used to improve performance in many applications. Similarly, to improve the delivery ratio and end2end delay in Wireless Sensor Networks (WSNs), the authors propose to use batch forwarding instead of streaming. The main goal in this paper is to...

    Provided By University of Texas

  • White Papers // Mar 2010

    Energy Efficient Block-Partitioned Multicore Processors for Parallel Applications

    Energy management has become an important research area in the last decade. As an energy efficient architecture, multicore has been widely adopted. However, with the number of cores on a single chip continuing to increase, it has been a grand challenge to effectively manage the energy efficiency of multicore-based systems....

    Provided By University of Texas

  • White Papers // Jul 2010

    Source Capture Time Analysis of Privacy Communication Protocols for Wireless Sensor Networks

    Communication privacy techniques that protect the locations of source sensor nodes and sink nodes from either global or local adversaries have received significant attention recently. The improvement in capture time, which is the time it takes for an adversary to identify the location of the source, is often estimated using...

    Provided By University of Texas

  • White Papers // Jun 2010

    SIDEKICK: Genomic Data Driven Analysis and Decision-Making Framework

    Scientists striving to unlock mysteries within complex biological systems face myriad barriers in effectively integrating available information to enhance their understanding. While experimental techniques and available data sources are rapidly evolving, useful information is dispersed across a variety of sources, and sources of the same information often do not use...

    Provided By University of Texas

  • White Papers // Jan 2010

    Safe, Multiphase Bounds Check Elimination in Java

    As part of its type-safety regime, the Java semantics require precise exceptions at runtime when programs attempt out-of-bound array accesses. This paper describes a Java implementation that utilizes a multiphase approach to identifying safe array accesses. This approach reduces runtime overhead by spreading the out-of-bounds checking effort across three phases...

    Provided By University of Texas

  • White Papers // Jun 2010

    Geographic Routing in d-Dimensional Spaces With Guaranteed Delivery and Low Stretch

    Almost all geographic routing protocols have been designed for 2D. The authors present a novel geographic routing protocol, MDT, for 2D, 3D, and higher dimensions with these properties: guaranteed delivery for any connected graph of nodes and physical links, and low routing stretch from efficient forwarding of packets at local...

    Provided By University of Texas

  • White Papers // Jan 2011

    Vertical Specialization, Intermediate Tariffs, And The Pattern Of Trade: Assessing The Role Of Tariff Liberalization To U.S. Bilateral Trade 1989-2001

    How important are intermediate tariffs in determining trade patterns? Empirical work measuring the impact of tariff liberalization most commonly focuses on the effects of barriers imposed by importers, but exporter trade policy should also matter when exports are produced with imported intermediates. Guided by extensions of the Eaton and Kortum...

    Provided By University of Texas

  • White Papers // Mar 2010

    Real-Time Head Pose Estimation on Mobile Platforms

    Many computer vision applications such as augmented reality require head pose estimation. As far as the real-time implementation of head pose estimation on relatively resource limited mobile platforms is concerned, it is required to satisfy real-time constraints while maintaining reasonable head pose estimation accuracy. The authors introduced head pose estimation...

    Provided By University of Texas