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University of California
(1028 results)-
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Urban-X: Towards Distributed Channel Assignment in Cognitive Multi-Radio Mesh Networks
September 17, 2010, 12:00am PDT
Researches about multi-radio mesh networks have mostly focused on channel allocation under internal interference. However, the deployment of WMNs in unlicensed bands of dense urban areas imposes...
Provided by University of California
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White Papers
Bluetooth 2.1 based Emergency Data Delivery System in HealthNet
December 18, 2007, 12:00am PST
The interests in health care have considerably increased these days as the aging population becomes larger. Health care has grown to the one of most active research areas especially in the area of...
Provided by University of California
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White Papers
E-ODMRP: Enhanced ODMRP With Motion Adaptive Refresh
April 10, 2008, 12:00am PDT
On Demand Multicast Routing Protocol (ODMRP) is a multicast routing protocol for mobile ad hoc networks. Its efficiency, simplicity, and robustness to mobility render it one of the most widely...
Provided by University of California
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White Papers
CORA: Collaborative Opportunistic Recovery Algorithm for Loss Controlled, Delay Bounded Ad Hoc Multicast
July 23, 2008, 12:00am PDT
In this paper, the authors present Collaborative Opportunistic Recovery Algorithm (CORA) designed for multicast multimedia applications with low loss as well as latency constraints in ad hoc...
Provided by University of California
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White Papers
Temperature Driven Time Synchronization
May 17, 2009, 12:00am PDT
Time synchronization in embedded sensor networks is an important service for correlating data between nodes and communication scheduling. While many different approaches to the problem are...
Provided by University of California
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White Papers
Frequency Quorum Rendezvous for Fast and Resilient Key Establishment Under Jamming Attack
July 2, 2010, 12:00am PDT
Jamming attacks have been recently studied as wireless security threats disrupting reliable RF communication in a wireless network. Existing countermeasures often make use of spread-spectrum...
Provided by University of California
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White Papers
Protecting Network Coded Packets in Coalition Networks
December 14, 2009, 12:00am PST
Network coding was found to be useful for ad hoc wireless multicast in disruptive channel and connectivity conditions. In heterogeneous networks, comprising teams with different technical...
Provided by University of California
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White Papers
Tahakum: A Multi-Purpose Audio Control Framework
June 1, 2011, 12:00am PDT
The authors present "Tahakum", an open source, extensible collection of software tools designed to enhance workflow on multichannel audio systems within complex multi-functional research and...
Provided by University of California
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White Papers
Sparse Online Low-Rank Projection and Outlier Rejection (SOLO) for 3-D Rigid-Body Motion Registration
February 10, 2012, 12:00am PST
Motivated by an emerging theory of robust low-rank matrix representation, in this paper, the authors introduce a novel solution for online rigid-body motion registration. The goal is to develop...
Provided by University of California
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White Papers
Towards an Efficient Distributed Object Recognition System in Wireless Smart Camera Networks
May 16, 2010, 12:00am PDT
The authors propose an efficient distributed object recognition system for sensing, compression, and recognition of 3-D objects and landmarks using a network of wireless smart cameras. The...
Provided by University of California
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White Papers
Multiple-View Object Recognition in Band-Limited Distributed Camera Networks
July 3, 2009, 12:00am PDT
In this paper, the authors study the classical problem of object recognition in low-power, low-bandwidth distributed camera networks. The ability to perform robust object recognition is crucial...
Provided by University of California
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White Papers
Distributed Compression and Fusion of Nonnegative Sparse Signals for Multiple-View Object Recognition
May 13, 2009, 12:00am PDT
Visual surveillance in complex urban environments requires an intelligent system to automatically track and identify multiple objects of interest in a network of distributed cameras. The ability...
Provided by University of California
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White Papers
Information Dissemination Control for Cooperative Active Safety Applications in Vehicular Ad-Hoc Networks
March 25, 2009, 12:00am PDT
Vehicular Ad-Hoc NETworks (VANETs) play a critical role in enabling important active safety applications such as collision warning and vehicle tracking. The most pressing challenge in enabling...
Provided by University of California
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White Papers
Stealthy Poisoning Attacks on PCA-Based Anomaly Detectors
April 22, 2009, 12:00am PDT
The authors consider systems that use PCA-based detectors obtained from a comprehensive view of the network's traffic to identify anomalies in backbone networks. To assess these detectors'...
Provided by University of California
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White Papers
Skilled in the Art of Being Idle: Reducing Energy Waste in Networked Systems
February 25, 2009, 12:00am PST
Networked end-systems such as desktops and set-top boxes are often left powered-on, but idle, leading to wasted energy consumption. An alternative would be for these idle systems to enter...
Provided by University of California
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White Papers
Entropy in Communication and Chemical Systems
July 31, 2008, 12:00am PDT
Entropy plays a central role in communication systems. On the one hand, the objective of communication is to reduce the entropy of some random variable. On the other hand, many useful models of...
Provided by University of California
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White Papers
A Distributed Algorithm for Optimal Throughput and Fairness in Wireless Networks With a General Interference Model
June 18, 2008, 12:00am PDT
In multi-hop wireless networks, earlier research on joint scheduling and congestion control has suggested that MAC-layer scheduling is the bottleneck. Distributed scheduling for maximal throughput...
Provided by University of California
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White Papers
Exploiting Interference Diversity for Event-Based Spectrum Sensing
August 21, 2008, 12:00am PDT
Spectrum sensing is a core problem in cognitive radio. Detecting the presence/absence of very weak primary users with a single antenna can be very difficult. Environmental uncertainties result in...
Provided by University of California
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White Papers
A Revenue Enhancing Stackelberg Game for Owners in Opportunistic Spectrum Access
January 1, 2012, 12:00am PST
A Stackelberg game between three players; spectrum owner, primary users and secondary users is presented under the Opportunistic Spectrum Access (OSA) model, where the secondary users share the...
Provided by University of California
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White Papers
Percolation on Interacting Networks
July 6, 2009, 12:00am PDT
Most networks of interest do not live in isolation. Instead they form components of larger systems in which multiple networks with distinct topologies coexist and where elements distributed...
Provided by University of California
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White Papers
Modeling and Verifying a Broad Array of Network Properties
April 28, 2009, 12:00am PDT
Motivated by widely observed examples in nature, society and software, where groups of related nodes arrive together and attach to existing networks, the authors consider network growth via...
Provided by University of California
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White Papers
TraJECT-3D: Generating Realistic Mobility Traces for Tactical Network Simulation
August 12, 2011, 12:00am PDT
The authors present TraJECT-3D (Track and Junction based Exploit over Complex Terrain), a realistic generator of node movement trajectories for simulating tactical Mobile Ad-Hoc NETworks (MANETs)....
Provided by University of California
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White Papers
Reliability-Aware Geocast for Mobile Ad Hoc Networks
September 1, 2011, 12:00am PDT
The authors present a geocast protocol for mobile ad hoc networks that selects the most statistically reliable path towards the geocast region. The novel aspect of their protocol is the...
Provided by University of California
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White Papers
Formal Modeling Execution Semantic of Control and Data Flow for the Composition Web Services
May 1, 2011, 12:00am PDT
Web Services Composition (WSC)-based applications are widely used in the heterogeneous environment, which has inevitably led to the need for reliable mechanisms for the WSC paradigm that can...
Provided by University of California
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White Papers
Measurement-Based Short-Term Performance Prediction in Wireless Mesh Networks
May 10, 2011, 12:00am PDT
Traditionally, the performance of Wireless Mesh Networks (WMNs) is measured by long-term averaged metrics, such as long-term averaged packet delivery ratio or throughput. However, due to the...
Provided by University of California
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White Papers
Exploiting Mobility for Trust Propagation in Mobile Ad Hoc Networks
May 12, 2011, 12:00am PDT
Trust plays an important role in protecting the security of mobile ad hoc networks. The node mobility brings challenge to trust propagation, where traditional graph-based propagation methods are...
Provided by University of California
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White Papers
PRONET: Network Trust Assessment Based on Incomplete Provenance
August 2, 2011, 12:00am PDT
This paper presents a tool ProNet, that is used to obtain the network trust based on incomplete provenance. The authors consider a multihop scenario where a set of source nodes observe an event...
Provided by University of California
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White Papers
Using Chaotic Maps for Encrypting Image and Video Content
September 12, 2011, 12:00am PDT
Arithmetic Coding (AC) is widely used for the entropy coding of text and multimedia data. It involves recursive partitioning of the range (0,1) in accordance with the relative probabilities of...
Provided by University of California
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White Papers
Evaluation of Network Trust Using Provenance Based on Distributed Local Intelligence
August 11, 2011, 12:00am PDT
Provenance can play a significant role in a military information system for supporting the calculation of information trust. A node's trust can change over time after its initial deployment due to...
Provided by University of California
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White Papers
QuRiNet: A Wide-Area Wireless Mesh Testbed for Research and Experimental Evaluations
December 13, 2009, 12:00am PST
Research in wireless mesh networks have been growing in recent years. Many testbeds have been created to study networking protocols in wireless mesh networks. In this paper, the authors describe...
Provided by University of California
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White Papers
Jamming Resistant Communication: Channel Surfing Without Negotiation
February 10, 2010, 12:00am PST
Channel surfing is an effective method to prevent jamming attacks in wireless communications. In traditional channel surfing schemes, two parties have to negotiate beforehand, in order to agree on...
Provided by University of California
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White Papers
Provenance Based Information Trustworthiness Evaluation in Multi-Hop Networks
July 7, 2010, 12:00am PDT
In this paper, the authors present a trust model to evaluate the trustworthiness of information as well as the information publishing nodes based on the information provenance. They consider two...
Provided by University of California
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White Papers
Soft-TDMAC: Software TDMA-Based MAC Over Commodity 802.11 Hardware
January 15, 2009, 12:00am PST
The authors design and implement Soft-TDMAC, a software Time Division Multiple Access (TDMA) based MAC protocol, running over commodity 802.11 hardware. Soft-TDMAC has a synchronization mechanism,...
Provided by University of California
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White Papers
Etherlay: An Overlay Enhancement for Metro Ethernet Networks
May 2, 2008, 12:00am PDT
The ubiquitous Ethernet technology has propelled itself into a wide-scale adoption for Metro Ethernet Networks (MEN). Despite recent advancements in Ethernet and commercialization of the first...
Provided by University of California
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White Papers
Characterizing Quality of Time and Topology in a Time Synchronization Network
January 1, 2012, 12:00am PST
As Internet computing gains speed, complexity, and becomes ubiquitous, the need for precise and accurate time synchronization increases. In this paper, the authors present a characterization of a...
Provided by University of California
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White Papers
Format-Preserving Encryption
December 30, 2009, 12:00am PST
Format-Preserving Encryption (FPE) encrypts a plaintext of some specified format into a cipher-text of identical format - for example, encrypting a valid credit-card number into a valid...
Provided by University of California
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White Papers
Online Ciphers From Tweakable Blockciphers
November 22, 2010, 12:00am PST
Informally, a cryptographic transform is said to be online if it can be computed by an algorithm that reads in the (unknown number of) input bits - in order, one at a time - as it writes out the...
Provided by University of California
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White Papers
A Context-Aware Approach to Wireless Transmission Adaptation
April 19, 2011, 12:00am PDT
Recent advancements in wireless transmission have enabled networks with a high level of physical layer flexibility. Unfortunately, these new opportunities are not harnessed by modern wireless...
Provided by University of California
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White Papers
Traffic Characterization and Internet Usage in Rural Africa
January 31, 2011, 12:00am PST
While Internet connectivity has reached a significant part of the world's population, those living in rural areas of the developing world are still largely disconnected. Recent efforts have...
Provided by University of California
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White Papers
Controlling Applications by Managing Network Characteristics
February 10, 2012, 12:00am PST
Edge network operators have limited tools to control activities on their networks. This paper examines network dissuasion, a new approach to edge network control, based on controlling the...
Provided by University of California
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White Papers
The Y-Architecture for On-Chip Interconnect: Analysis and Methodology
January 1, 2011, 12:00am PST
The Y-architecture for on-chip interconnect is based on pervasive use of 0-, 120-, and 240-degree oriented semi-global and global wiring. Its use of three uniform directions exploits on-chip...
Provided by University of California
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White Papers
Usher: An Extensible Framework for Managing Clusters of Virtual Machines
September 13, 2007, 12:00am PDT
Usher is a virtual machine management system designed to impose few constraints upon the computing environment under its management. Usher enables administrators to choose how their virtual...
Provided by University of California
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White Papers
A Common Substrate for Cluster Computing
May 25, 2009, 12:00am PDT
The success of MapReduce has sparked many e orts to design cluster computing frameworks. The authors argue that no single framework will be optimal for all applications, and that they should...
Provided by University of California
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White Papers
Information-Acquisition-as-a-Service for Cyber-Physical Cloud Computing
May 15, 2010, 12:00am PDT
Data center cloud computing distinguishes computational services such as database transactions and data storage from computational resources such as server farms and disk arrays. Cloud computing...
Provided by University of California
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White Papers
NERSC Cyber Security Challenges That Require DOE Development and Support
May 16, 2008, 12:00am PDT
Traditional security approaches do not adequately address all the requirements of open, scientific computing facilities. Many of the methods used for more restricted environments, including almost...
Provided by University of California
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White Papers
Soundness of Formal Encryption in the Presence of Active Adversaries
January 1, 2011, 12:00am PST
Cryptographic protocols are a fundamental tool in the design of secure distributed computing systems, but they are also extremely hard to design and validate. The difficulty of designing valid...
Provided by University of California
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White Papers
Optimal Communication Complexity of Generic Multicast Key Distribution
January 1, 2011, 12:00am PST
The authors prove a tight lower bound for generic protocols for secure multicast key distribution where the messages sent by the group manager are obtained by arbitrarily nested application of a...
Provided by University of California
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White Papers
Generating Tests From Counterexamples
January 1, 2011, 12:00am PST
The authors have extended the software model checker BLAST to automatically generate test suites that guarantee full coverage with respect to a given predicate. More precisely, given a C program...
Provided by University of California
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White Papers
Learning Classifiers From Only Positive and Unlabeled Data
August 27, 2008, 12:00am PDT
The input to an algorithm that learns a binary classifier normally consists of two sets of examples, where one set consists of positive examples of the concept to be learned, and the other set...
Provided by University of California
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White Papers
A Bayesian Network Framework for Reject Inference
January 1, 2011, 12:00am PST
Most learning methods assume that the training set is drawn randomly from the population to which the learned model is to be applied. However in many applications this assumption is invalid. For...
Provided by University of California
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White Papers
Accelerating Viola-Jones Face Detection to FPGA-Level Using GPUs
June 7, 2010, 12:00am PDT
Face detection is an important aspect for biometrics, video surveillance and human computer interaction. The authors present a multi-GPU implementation of the Viola-Jones face detection algorithm...
Provided by University of California
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White Papers
Chameleon: A Framework for Observing, Understanding, and Imitating the Memory Behavior of Applications
May 2, 2008, 12:00am PDT
In this work, the authors present an integrated solution to three classic problems in the field of performance analysis: memory modeling, synthetic address trace generation, and the creation of...
Provided by University of California
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White Papers
Toward Petascale Simulation of Cellular Microphysiology
August 1, 2007, 12:00am PDT
MCell is a Monte Carlo simulator of cell microphysiology, and the scalable variant can be used to study challenging problems of interest to the biological community. MCell can currently model a...
Provided by University of California
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White Papers
Inter-Socket Victim Cacheing for Platform Power Reduction
August 31, 2010, 12:00am PDT
On a multi-socket architecture with load below peak, as is often the case in a server installation, it is common to consolidate load onto fewer sockets to save processor power. However, this can...
Provided by University of California
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White Papers
Implementation and Evaluation of a Mobile PlanetLab Node
August 18, 2009, 12:00am PDT
With the introduction of cellular phones, mobile wireless communication has become an integral part of day-to-day life in this century. A testbed is crucial in continuing cutting-edge wireless...
Provided by University of California
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White Papers
A Loop Correlation Technique to Improve Performance Auditing
August 17, 2007, 12:00am PDT
Performance auditing is an online optimization strategy that empirically measures the effectiveness of an optimization on a particular code region. It has the potential to greatly improve...
Provided by University of California
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White Papers
Hiding Communication Latency With Non-SPMD, Graph-Based Execution
February 19, 2009, 12:00am PST
Reformulating an algorithm to mask communication delays is crucial in maintaining scalability, but traditional solutions embed the overlap strategy into the application. The authors present an...
Provided by University of California
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White Papers
Comparison of the Three CPU Schedulers in Xen
November 8, 2007, 12:00am PST
The primary motivation for enterprises to adopt virtualization technologies is to create a more agile and dynamic IT infrastructure - with server consolidation, high resource utilization, the...
Provided by University of California
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White Papers
A New Network Architecture for Future Optical Networks: Coarse Optical Circuit Switching by Default, Rerouting Over Circuits for Adaptation
January 1, 2009, 12:00am PST
As Internet traffic continues to grow unabated at an exponential rate, it is unclear whether or not the existing packet routing network architecture based on electronic routers will continue to...
Provided by University of California
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White Papers
Free Cash Flow And Takeover Threats: An Experimental Study
June 22, 2007, 12:00am PDT
A classic theory of corporate governance holds that, when cash flow is high and investment opportunities scarce, takeover threats reduce managerial self dealing and encourage dividend payment to...
Provided by Regents of the University of California
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White Papers
Interactive Volume Rendering Systems for Large Scale Multiple Volumes With Multiple Channels
July 26, 2008, 12:00am PDT
Volume rendering is a very important visualization tool in many scientific disciplines. Scientists at the National Center for Microscopy and Imaging Research (NCMIR) use high resolution electron...
Provided by University of California
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White Papers
Maximizing Efficiency by Trading Storage for Computation
May 25, 2009, 12:00am PDT
Traditionally, computing has meant calculating results and then storing those results for later use. Unfortunately, committing large volumes of rarely used data to storage wastes space and energy,...
Provided by University of California
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Difference Engine: Harnessing Memory Redundancy in Virtual Machines
October 7, 2008, 12:00am PDT
Virtual Machine monitors (VMMs) are a popular platform for Internet hosting centers and cloud-based compute services. By multiplexing hardware resources among virtual machines (VMs) running...
Provided by University of California
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White Papers
Globus: A Metacomputing Infrastructure Toolkit
January 1, 2010, 12:00am PST
Emerging high-performance applications require the ability to exploit diverse, geographically distributed resources. These applications use high-speed networks to integrate supercomputers, large...
Provided by Regents of the University of California
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White Papers
Compact Proofs of Retrievability
January 11, 2011, 12:00am PST
The central challenge is to build systems that are both efficient and provably secure-that is, it should be possible to extract the client's data from any prover that passes a verification check....
Provided by Regents of the University of California
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White Papers
A Java Implementation on the Xscale Platform
December 4, 2008, 12:00am PST
Java has become one of the most widely used object-oriented programming languages. The write once, run anywhere portability of Java makes it an attractive alternative to C for applications...
Provided by Regents of the University of California
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White Papers
When Good Randomness Goes Bad: Virtual Machine Reset Vulnerabilities and Hedging Deployed Cryptography
March 23, 2010, 12:00am PDT
Random Number Generators (RNGs) are consistently a weak link in the secure use of cryptography. Routine cryptographic operations such as encryption and signing can fail spectacularly given...
Provided by University of California
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White Papers
Scalable Virtual Machine Multiplexing
May 19, 2009, 12:00am PDT
A Virtual Machine (VM) is a software abstraction of a real, physical machine. Virtualization has been around for almost 50 years, beginning with IBM's pioneering work in the 1960s. However, recent...
Provided by University of California
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White Papers
Towards a Proximal Resource-Based Architecture to Support Augmented Reality Applications
March 15, 2010, 12:00am PDT
The authors are developing a new enhanced cloud-based computing architecture, called the Proximal Workspace architecture to allow access and interaction between lightweight devices, e.g., video...
Provided by University of California
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White Papers
The ProximalWorkspace Architecture: A Latency-Focused Approach to Supporting Context-Aware Applications
March 16, 2010, 12:00am PDT
The authors are developing a new enhanced cloud-based computing architecture, called the Proximal Workspace architecture to allow access and interaction between lightweight devices, and...
Provided by University of California
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White Papers
NetShare: Virtualizing Bandwidth Within the Cloud
February 4, 2008, 12:00am PST
The authors present NetShare, a way of dividing a network into slices, such that that each network slice has the illusion of a network all to itself with guaranteed bandwidth. Bandwidth unused by...
Provided by University of California
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White Papers
Desktop Virtualization Pilot Project
January 27, 2010, 12:00am PST
Desktop virtualization (or Virtual Desktop Infrastructure - VDI) is a server-centric computing model that borrows from the traditional thin-client model, but is designed to give system...
Provided by Regents of the University of California
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White Papers
The Role Of Search Engine Optimization In Search Rankings
January 12, 2010, 12:00am PST
Web sites invest significant resources in trying to influence their visibility among online search results. In addition to paying for sponsored links, they invest in methods known as search engine...
Provided by University of California
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White Papers
Streaming Satellite Data to Cloud Workflows for On-Demand Computing of Environmental Products
September 12, 2010, 12:00am PDT
Environmental data arriving constantly from satellites and weather stations are used to compute weather coefficients that are essential for agriculture and viticulture. For example, the reference...
Provided by University of California
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White Papers
Search Engine Optimization Specialized Studies
October 5, 2010, 12:00am PDT
The demand for Search Engine Optimization (SEO) professionals is growing, as consumers increasingly utilize Internet search engines such as Google, Yahoo, Bing and Bidu to guide their purchasing...
Provided by Regents of the University of California
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White Papers
EPEW: An Extended Prototyping Environment for Wireless Mesh Networks
September 30, 2008, 12:00am PDT
This paper introduces EPEW, an environment for rapid prototyping of communication protocols over IEEE 802.11 mesh networks. EPEW provides a software environment that makes prototyping as quick,...
Provided by University of California
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White Papers
A Prototyping Environment for Wireless Multihop Networks
September 26, 2007, 12:00am PDT
Relative to the impressive number of proposals addressing the multitude of challenges raised by IEEE 802.11-based wireless net-works, few have known real implementation. In wireless networks, due...
Provided by University of California
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White Papers
Throughput Analysis of Wireless Mesh Networks
January 16, 2008, 12:00am PST
Wireless mesh networks are rapidly deployable for many applications. The throughput of such a network depends on the schemes used for medium access control. In this paper, the authors present some...
Provided by University of California
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White Papers
Enhancing Multi-Hop Wireless Mesh Networks With a Ring Overlay
May 16, 2008, 12:00am PDT
Wireless Mesh Network (WMN) has become popular access network architecture. But because of its multi-hop nature, co-channel interference and contention, the attainable capacity of a wireless node...
Provided by University of California
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White Papers
Fisheye State Routing in Mobile Ad Hoc Networks
January 1, 2010, 12:00am PST
In this paper, the authors present a novel routing protocol for wireless ad hoc networks - Fisheye State Routing (FSR). FSR introduces the notion of multi-level fisheye scope to reduce routing...
Provided by University of California
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