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University of California
(1028 results)-
White Papers
Data Management and Layout for Shingled Magnetic Recording
May 15, 2011, 12:00am PDT
Ultimately the performance and success of a shingled write disk will be determined by more than the physical hardware realized, but will depend on the data layouts employed, the workloads...
Provided by University of California
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White Papers
Security Aware Partitioning for Efficient File System Search
February 25, 2010, 12:00am PST
Index partitioning techniques - where indexes are broken into multiple distinct sub-indexes - are a proven way to improve metadata search speeds and scalability for large file systems, permitting...
Provided by University of California
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White Papers
Copernicus: A Scalable, High-Performance Semantic File System
October 1, 2009, 12:00am PDT
Hierarchical file systems do not effectively meet the needs of users at the petabyte-scale. Users need dynamic, search-based file access in order to properly manage and use their growing sea of...
Provided by University of California
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White Papers
Using Storage Class Memories to Increase the Reliability of Two-Dimensional RAID Arrays
April 1, 2009, 12:00am PDT
Two-dimensional RAID arrays maintain separate row and column parities for all their disks. Depending on their organization, they can tolerate between two and three concurrent disk failures without...
Provided by University of California
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White Papers
Sparse Indexing: Large Scale, Inline Deduplication Using Sampling and Locality
January 28, 2009, 12:00am PST
The authors present sparse indexing, a technique that uses sampling and exploits the inherent locality within backup streams to solve for large-scale backup (e.g., hundreds of terabytes) the...
Provided by University of California
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White Papers
Spyglass: Fast, Scalable Metadata Search for Large-Scale Storage Systems
January 27, 2009, 12:00am PST
The scale of today's storage systems has made it increasingly difficult to find and manage files. To address this, the authors have developed Spyglass, a file metadata search system that is...
Provided by University of California
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White Papers
RADOS: A Fast, Scalable, and Reliable Storage Service for Petabyte-Scale Storage Clusters
November 10, 2007, 12:00am PST
Brick and object-based storage architectures have emerged as a means of improving the scalability of storage clusters. However, existing systems continue to treat storage nodes as passive devices,...
Provided by University of California
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White Papers
The Impact of Failures on Large Distributed Storage Systems
August 1, 2007, 12:00am PDT
Distributed storage systems that can support high throughput and capacities in the petabytes range, are being built using standard Off the Shelf Components disks and networks to lower costs. Both...
Provided by University of California
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White Papers
LiFSBrowse: A Visual, User Environment for the Linking File System
August 1, 2007, 12:00am PDT
The Linking File System introduces a new storage paradigm for enhanced user productivity through relationships between files, yet it opens up new challenges in usability. LiFSBrowse is a GUI for...
Provided by University of California
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White Papers
Scalable Security for High Performance, Petascale Storage
June 1, 2007, 12:00am PDT
Petabyte scale, high-performance parallel file systems often hold sensitive data and thus require security, but authentication and authorization have the potential to reduce performance...
Provided by University of California
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White Papers
Reducing Hybrid Disk Write Latency With Flash-Backed I/O Requests
August 15, 2007, 12:00am PDT
One of the biggest bottlenecks in desktop-based computing is the hard disk with I/O write latency being a key contributor. I/O write latency stems from the mechanical nature of hard disks, with...
Provided by University of California
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White Papers
Malware in IEEE 802.11 Wireless Networks
February 4, 2008, 12:00am PST
Malicious software (malware) is one of the largest threats facing the Internet today. In recent years, malware has proliferated into wireless LANs as these networks have grown in popularity and...
Provided by University of California
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White Papers
Privacy Preserving Joins
December 13, 2007, 12:00am PST
In this paper, the authors design a system for mutually distrustful entities to perform privacy preserving joins, leveraging the power of a memory-limited secure coprocessor. Under this setting,...
Provided by University of California
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White Papers
Enabling Multi-Level Trust in Privacy Preserving Data Mining
December 13, 2008, 12:00am PST
Privacy Preserving Data Mining (PPDM) addresses the problem of developing accurate models about aggregated data without access to precise information in individual data record. A widely studied...
Provided by University of California
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White Papers
Scaling Peer-to-Peer Video-on-Demand Systems Using Helpers
August 16, 2009, 12:00am PDT
The throughput of Peer-To-Peer (P2P) Video-on-Demand (VoD) systems is typically capped by the users' aggregate upload bandwidth. The drastic increase in the popularity of VoD and the demand of...
Provided by University of California
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White Papers
Power Efficiency in High Performance Computing
January 28, 2008, 12:00am PST
This paper provides power measurements for various computational loads on the largest scale HPC systems ever involved in such an assessment. This paper demonstrates clearly that, contrary to...
Provided by University of California
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White Papers
WSAT: A Tool for Formal Analysis of Web Services
January 1, 2008, 12:00am PST
This paper presents Web Service Analysis Tool (WSAT), a tool for analyzing and verifying composite web service designs, with the state of the art model checking techniques. Web services are...
Provided by University of California
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White Papers
A Top-Down Approach to Modeling Global Behaviors of Web Services
January 1, 2008, 12:00am PST
Due to the distributed nature of modern composite web services, designers are facing new challenges in both requirement specification as well as logic validation. This paper proposes a top-down...
Provided by University of California
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White Papers
Fast Secure Processor for Inhibiting Software Piracy and Tampering
January 1, 2008, 12:00am PST
Due to the widespread software piracy and virus attacks, significant efforts have been made to improve security for computer systems. For stand-alone computers, a key observation is that other...
Provided by University of California
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White Papers
Call-Chain Software Instruction Prefetching in J2EE Server Applications
December 10, 2007, 12:00am PST
This paper presents a detailed characterization of instruction cache performance for IBM's J2EE-enabled web server, WebSphere Application Server (WAS). When running two J2EE benchmarks on...
Provided by University of California
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White Papers
Maintaining High Bandwidth Under Dynamic Network Conditions
January 1, 2008, 12:00am PST
The need to distribute large files across multiple wide-area sites is becoming increasingly common, for instance, in support of scientific computing, configuring distributed systems, distributing...
Provided by University of California
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White Papers
UML Component Diagrams and Software Architecture - Experiences From the WREN Project
January 1, 2008, 12:00am PST
In the course of building Wren, a component-based development environment, the researchers encountered several difficulties when they tried to use UML component diagrams for modeling software...
Provided by University of California
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White Papers
Conducting Cybersecurity Research Legally and Ethically
April 4, 2008, 12:00am PDT
The primary legal obstacles to conducting cybersecurity are not outright prohibitions but rather the difficulty of determining which of a large set of complex statutes might regulate a given...
Provided by University of California
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White Papers
NeTS - FIND: Enabling Defense and Deterrence Through Private Attribution
September 1, 2008, 12:00am PDT
The Internet's any-to-any, best-effort communication model is widely heralded as one of the main reasons for its success. The absence of strong architectural restrictions has allowed Internet...
Provided by University of California
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White Papers
Traffic Flow Reconstruction Using Mobile Sensors and Loop Detector Data
July 31, 2007, 12:00am PDT
In order to develop efficient control strategies to improve traffic conditions on freeways, it is necessary to know the state of the freeway at any point in time and space. Using data collected...
Provided by University of California
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White Papers
Distributed Measurement-Aware Routing: Striking a Balance Between Measurement and Traffic Engineering
January 11, 2012, 12:00am PST
Network-wide traffic measurement is important for various network management tasks, ranging from traffic accounting, traffic engineering, and network troubleshooting to security. Existing...
Provided by University of California
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White Papers
Experimental Evaluation of the Impact of Packet Capturing Tools for Web Services
July 16, 2011, 12:00am PDT
Network measurement is a discipline that provides the techniques to collect data that are fundamental to many branches of computer science. While many capturing tools and comparisons have made...
Provided by University of California
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White Papers
Streaming Solutions for Fine-Grained Network Traffic Measurements and Analysis
August 20, 2011, 12:00am PDT
Streaming network traffic measurements and analysis is critical for detecting and preventing any real-time anomalies in the network. The high speeds and complexity of today's network make the...
Provided by University of California
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White Papers
Detecting BGP Anomalies With Wavelet
December 14, 2007, 12:00am PST
In this paper, the authors propose a BGP anomaly detection framework called BAlet that delivers both temporal and spatial localization of the potential anomalies. It requires only a simple count...
Provided by University of California
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White Papers
Lagrangian Sensing: Traffic Estimation With Mobile Devices
January 21, 2009, 12:00am PST
An inverse modeling algorithm is developed to reconstruct the state of traffic on highways (velocity field) from GPS measurements gathered from mobile phones traveling on-board vehicles. The...
Provided by University of California
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White Papers
Compiler-Driven Dependence Profiling to Guide Program Parallelization
July 21, 2008, 12:00am PDT
As hardware systems move toward multi-core and multithreaded architectures, programmers increasingly rely on automated tools to help with both the parallelization of legacy codes and effective...
Provided by University of California
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White Papers
Real-Time Musical Applications on an Experimental Operating System for Multi-Core Processors
June 24, 2011, 12:00am PDT
A natural approach to increasing the performance of musical applications is to exploit their inherent parallel structure on general-purpose multi-core architectures. In this paper, the authors...
Provided by University of California
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White Papers
Datacenter-Scale Network Research on FPGAs
April 15, 2011, 12:00am PDT
The authors describe an FPGA-based datacenter network simulator to allow researchers to rapidly experiment with O(10, 000) node datacenter network architectures. They configure the FPGA hardware...
Provided by University of California
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White Papers
An FPGA-Based Simulator for Datacenter Networks
February 26, 2010, 12:00am PST
The authors describe an FPGA-based datacenter network simulator for researchers to rapidly experiment with O(10,000) node datacenter network architectures. Their simulation approach configures the...
Provided by University of California
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White Papers
SEJITS: Getting Productivity and PerformanceWith Selective Embedded JIT Specialization
August 2, 2009, 12:00am PDT
Today's "High productivity" programming languages such as Python lack the performance of harder-to-program "Efficiency" languages (CUDA, Cilk, C with OpenMP) that can exploit extensive programmer...
Provided by University of California
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White Papers
Silicon-Photonic Clos Networks for Global On-Chip Communication
May 1, 2009, 12:00am PDT
Future manycore processors will require energy-efficient, high-throughput on-chip networks. Silicon-photonics is a promising new interconnect technology which offers lower power, higher bandwidth...
Provided by University of California
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White Papers
Tessellation: Space-Time Partitioning in a Manycore Client OS
March 3, 2009, 12:00am PST
The authors argue for Space-Time Partitioning (STP) in manycore operating systems. STP divides resources such as cores, cache, and network bandwidth amongst interacting software components....
Provided by University of California
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White Papers
Quantitative Evaluation of Secure Network Coding
August 10, 2010, 12:00am PDT
Network coding has gained significant attention by improving throughput and reliability in disruptive MANETs. Yet, it is vulnerable to attacks from malicious nodes. In order to prevent this...
Provided by University of California
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White Papers
Multi-Modal Modeling of Urban Mobility
August 17, 2010, 12:00am PDT
Design and efficacy of a routing protocol for mobile ad-hoc networks strongly depends on the underlying mobility pattern of the mobile nodes. Counter to the perception of mobility being random in...
Provided by University of California
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White Papers
Flexible and Secure Communications in an Identity-Based Coalition Environment
August 20, 2008, 12:00am PDT
In this paper, the authors consider the problem of how entities operating under distinct roots of trust in a coalition environment can flexibly and securely communicate with one another. They...
Provided by University of California
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White Papers
Inspector Gadget: Automated Extraction of Proprietary Gadgets From Malware Binaries
April 22, 2010, 12:00am PDT
Unfortunately, malicious software is still an unsolved problem and a major threat on the Internet. An important component in the fight against malicious software is the analysis of malware...
Provided by University of California
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White Papers
Effective Anomaly Detection With Scarce Training Data
April 22, 2010, 12:00am PDT
Learning-based anomaly detection has proven to be an effective black-box technique for detecting unknown attacks. However, the effectiveness of this technique crucially depends upon both the...
Provided by University of California
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White Papers
Automatic Network Protocol Analysis
December 16, 2007, 12:00am PST
Protocol reverse engineering is the process of extracting application-level specifications for network protocols. Such specifications are very helpful in a number of security-related contexts. For...
Provided by University of California
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White Papers
A View on Current Malware Behaviors
April 1, 2009, 12:00am PDT
Anubis is a dynamic malware analysis platform that executes submitted binaries in a controlled environment. To perform the analysis, the system monitors the invocation of important Windows API...
Provided by University of California
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White Papers
Static Analysis for Detecting Taint-Style Vulnerabilities in Web Applications
September 29, 2010, 12:00am PDT
The number and the importance of web applications have increased rapidly over the last years. At the same time, the quantity and impact of security vulnerabilities in such applications have grown...
Provided by University of California
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White Papers
A Parallel Architecture for Stateful, High-Speed Intrusion Detection
September 22, 2008, 12:00am PDT
The increase in bandwidth over processing power has made stateful intrusion detection for high-speed networks more difficult, and, in certain cases, impossible. The problem of real-time stateful...
Provided by University of California
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White Papers
The Tradeo Between Energy Efficiency and User State Estimation Accuracy in Mobile Sensing
August 18, 2009, 12:00am PDT
People-centric sensing and user state recognition can provide rich contextual information for various mobile applications and services. However, continuously capturing this contextual information...
Provided by University of California
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White Papers
Removing Web Spam Links From Search Engine Results
March 31, 2009, 12:00am PDT
Web spam denotes the manipulation of web pages with the sole intent to raise their position in search engine rankings. Since a better position in the rankings directly and positively affects the...
Provided by University of California
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White Papers
Analyzing and Detecting Malicious Flash Advertisements
June 10, 2010, 12:00am PDT
The amount of dynamic content on the web has been steadily increasing. Scripting languages such as JavaScript and browser extensions such as Adobe's Flash have been instrumental in creating...
Provided by University of California
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White Papers
Improving Signature Testing Through Dynamic Data Flow Analysis
December 11, 2007, 12:00am PST
The effectiveness and precision of network-based intrusion detection signatures can be evaluated either by direct analysis of the signatures (if they are available) or by using black-box testing...
Provided by University of California
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White Papers
The Cost Of Inflation: A Mechanism Design Approach
January 1, 2011, 12:00am PST
A classical topic in monetary economics is measuring the burden that inflation imposes on society. The standard methodology, pioneered by Bailey (1956) and Friedman (1969) and reviewed in Lucas...
Provided by University of California
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White Papers
Cost, Conflict And Climate: U.S. Challenges In The World Oil Market
June 1, 2008, 12:00am PDT
Dramatic increases in the price of crude oil since mid-2007 have ratcheted up attention on energy policy, but cost is only one of the three oil challenges that confront the U.S. In this short...
Provided by University of California Energy Institute
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White Papers
The Implications Of A Gasoline Price Floor For The California Budget And Greenhouse Gas Emissions
December 12, 2008, 12:00am PST
California is faced with an unprecedented budget crisis. The state is also committed to significant reductions in greenhouse gases that cause climate change. Meanwhile, the price of gasoline is...
Provided by University of California Energy Institute
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White Papers
Explaining The Price Of Voluntary Carbon Offsets
September 8, 2009, 12:00am PDT
This paper investigates factors that explain the large variability in the price of voluntary carbon offsets. The authors estimate hedonic price functions using a variety of provider- and...
Provided by University of California Energy Institute
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White Papers
What Do Emissions Markets Deliver And To Whom? Evidence From Southern California?s NOx Trading Program
June 9, 2009, 12:00am PDT
A perceived advantage of cap-and-trade programs over more prescriptive environmental regulation is that enhanced compliance flexibility and cost effectiveness can make more stringent emissions...
Provided by University of California Energy Institute
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White Papers
Taxes And Trading Versus Intensity Standards: Second-Best Environmental Policies With Incomplete Regulation (Leakage) Or Market Power
August 17, 2009, 12:00am PDT
This paper investigates whether an emissions tax is the best policy in the presence of incomplete regulation (leakage) or market power by analyzing an intensity standard regulating emissions per...
Provided by University of California Energy Institute
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White Papers
Do Americans Consume Too Little Natural Gas? An Empirical Test Of Marginal Cost Pricing
September 1, 2009, 12:00am PDT
A standard result in regulation is that efficiency requires that marginal prices be set equal to marginal costs. This paper performs an empirical test of marginal cost pricing in the natural gas...
Provided by University of California Energy Institute
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White Papers
Wireless Health and the Smart Phone Conundrum
March 31, 2009, 12:00am PDT
This paper presents a study of the five best selling Smart Phones in terms of their applicability to Wireless Health. Smart Phones are generally used as central controlling units in Wireless...
Provided by University of California
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White Papers
FingerGlass: Efficient Multiscale Interaction on Multitouch Screens
May 12, 2011, 12:00am PDT
Many tasks in graphical user interfaces require users to interact with elements at various levels of precision. The authors present FingerGlass, a bimanual technique designed to improve the...
Provided by University of California
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White Papers
Privacy Concerns in Upcoming Demand-Response Systems
October 20, 2009, 12:00am PDT
The collection of power consumption data in current and future demand-response systems creates serious privacy concerns. In a lax regulatory environment, the detailed household consumption data...
Provided by University of California
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White Papers
Embedded RFID and Everyday Things: A Case Study of the Security and Privacy Risks of the U.S. e-Passport
October 9, 2007, 12:00am PDT
New applications for Radio Frequency Identification (RFID) technology include embedding transponders in everyday things used by individuals, such as books, payment cards, and personal...
Provided by University of California
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White Papers
Earnings Determination And Taxes: Evidence From A Cohort-Based Payroll Tax Reform In Greece
February 2, 2010, 12:00am PST
This paper analyzes the response of earnings to payroll tax rates using a cohort-based reform in Greece. All individuals who started working on or after 1993 face permanently a much higher...
Provided by University of California
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White Papers
The Rise And Fall Of The Nonconventional Mortgage Industry
April 2, 2010, 12:00am PDT
The 2007-2009 financial crises were centered on the nonconventional mortgage industry. Scholars have just begun to carefully consider what really caused the crisis. This paper pushes the debate...
Provided by University of California
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White Papers
Understanding Handoffs in Large IEEE 802.11 Wireless Networks
August 27, 2007, 12:00am PDT
As the utility of wireless technology grows, wireless networks are being deployed in more widely varying conditions. The monitoring of these networks continues to reveal key implementation...
Provided by University of California
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White Papers
Memory Subsystem Simulation in Software TLM/T Models
February 23, 2009, 12:00am PST
Design of Multiprocessor System-on-a-Chips requires efficient and accurate simulation of every component. Since the memory subsystem accounts for up to 50%of the performance and energy...
Provided by University of California
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White Papers
A Meta-Notation for Data Visualization
December 15, 2010, 12:00am PST
The authors describe a meta-notation devised to express the major structural characteristics in widely-used data visualizations. The meta-notation consists of unary and binary operators that can...
Provided by University of California
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White Papers
Object Identification in a Bayesian Context
November 7, 2007, 12:00am PST
Object identification - the task of deciding that two observed objects are in fact one and the same object - is a fundamental requirement for any situated agent that reasons about individuals....
Provided by University of California
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White Papers
Performance Impacts of Multi-Scaling in Wide Area TCP/IP Traffic
November 8, 2007, 12:00am PST
Recent measurement and simulation studies have revealed that wide area network traffic has complex statistical - possibly multifractal - characteristics on short timescales, and is self-similar on...
Provided by University of California
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White Papers
URL Forwarding and Compression in Adaptive Web Caching
November 7, 2007, 12:00am PST
Web caching is generally acknowledged as an important service for alleviating focused overloads when certain web servers' contents suddenly become popular. Cooperative caching systems are more...
Provided by University of California
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White Papers
The Quantitative Comparison of IP Networks
March 27, 2008, 12:00am PDT
The authors propose a new methodology for comparing network traces. This methodology is based on the use of multiple statistical measures on the set of network characteristics, and the...
Provided by University of California
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White Papers
Secure IP Telephony Using Multi-Layered Protection
January 1, 2011, 12:00am PST
This paper presents the design and analysis of a multilayer protection scheme against Denial-of-Service (DoS) attacks in IP telephony enabled enterprise networks. While there are many types of DoS...
Provided by University of California
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White Papers
Heterogeneity And Trade
December 1, 2007, 12:00am PST
Aggregate production functions are a standard feature of the trade theorist's toolbox. While this modeling device has generated some fundamental insights, it presents one obvious shortcoming: it...
Provided by University of California
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White Papers
Integration Without Identification? The Determinants Of Europeanness In The EU
April 1, 2009, 12:00am PDT
European identity has moved from a possible outcome of integration to a force determining the level of future integration, because without some identification with Europe on the part of the...
Provided by University of California
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White Papers
A Secure, Publisher-Centric Web Caching Infrastructure
January 1, 2011, 12:00am PST
The current web caching infrastructure, though it has a number of performance benefits for clients and network providers, does not meet publishers' requirements. The authors argue that to satisfy...
Provided by University of California
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White Papers
Data Mining by Navigation - An Experience with Systems Biology
January 1, 2011, 12:00am PST
This paper proposes a navigational method for mining by collecting evidences from diverse data sources. Since the representation method and even semantics of data elements differ widely from one...
Provided by University of California
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White Papers
Computational Differential Privacy
June 3, 2009, 12:00am PDT
The definition of differential privacy has recently emerged as a leading standard of privacy guarantees for algorithms on statistical databases. The authors offer several relaxations of the...
Provided by University of California
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White Papers
Integrating Marine Observatories Into a System-of-Systems: Messaging in the US Ocean Observatories Initiative
August 29, 2009, 12:00am PDT
The Ocean Observatories Initiative (OOI) will implement ocean sensor networks covering a diversity of oceanic environments, ranging from the coastal to the deep ocean. Construction will begin in...
Provided by University of California
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White Papers
Host Multicast: A Framework for Delivering Multicast to End Users
January 1, 2011, 12:00am PST
While the advantages of multicast delivery over multiple unicast deliveries is undeniable, the deployment of the IP multicast protocol has been limited to "Islands" of network domains under single...
Provided by University of California
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White Papers
Credit Card Debt And Payment Use
May 1, 2008, 12:00am PDT
Approximately half of credit card holders in the United States regularly carry unpaid credit card debt. These so-called "Revolvers" exhibit payment behavior that differs from that of those who...
Provided by Regents of the University of California
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White Papers
Leadership: Current Theories, Research, And Future Directions
April 28, 2009, 12:00am PDT
This review examines recent theoretical and empirical developments in the leadership literature, beginning with topics that are currently receiving attention in terms of research, theory, and...
Provided by University of California
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