UC Regents

Displaying 1-40 of 299 results

  • White Papers // Oct 2013

    Algebraic MACs and Keyed-Verification Anonymous Credentials

    The authors consider the problem of constructing anonymous credentials for use in a setting where the issuer of credentials is also the verifier, or more generally where the issuer and verifier have a shared key. In this setting they can use Message Authentication Codes (MACs) instead of public key signatures...

    Provided By UC Regents

  • White Papers // Oct 2013

    New Trapdoor Projection Maps for Composite-Order Bilinear Groups

    An asymmetric pairing over groups of composite order is a bilinear map e: G1 G2 - GT for groups G1 and G2 of composite order N = pq. The authors observe that a recent construction of pairing-friendly elliptic curves in this setting by the researcher exhibits surprising and unprecedented structure:...

    Provided By UC Regents

  • White Papers // Jun 2013

    Measuring the Practical Impact of DNSSEC Deployment

    DNSSEC extends DNS with a public-key infrastructure, providing compatible clients with cryptographic assurance for DNS records they obtain, even in the presence of an active network attacker. As with many internet protocol deployments, administrators deciding whether to deploy DNSSEC for their DNS zones must perform cost/benefit analysis. For some fraction...

    Provided By UC Regents

  • White Papers // Jun 2012

    Establishing Browser Security Guarantees through Formal Shim Verification

    Web browsers mediate access to valuable private data in domains ranging from health care to banking. Despite this critical role, attackers routinely exploit browser vulnerabilities to exfiltrate private data and take over the underlying system. The authors present QUARK, a browser whose kernel has been implemented and verified in Coq....

    Provided By UC Regents

  • White Papers // Aug 2011

    Improved Spectrum Access Control of Cognitive Radios Based on Primary ARQ Signals

    Cognitive radio systems capable of opportunistic spectrum access represent a new paradigm for improving the efficiency of current spectrum utilization. In this paper, the authors present a novel cognitive channel access method based on learning from both primary channel transmissions and the receiver ARQ feedback signals. This new sensing-plus-confirmation scheme...

    Provided By UC Regents

  • White Papers // Aug 2011

    Quality-of-Information Aware Networking for Tactical Military Networks

    In tactical military networks, decisions must often be made quickly based on information at hand. It is a challenge to provide decision makers with a notion of the quality of the information they have, or to provide a method by which decision makers can specify a required quality of information....

    Provided By UC Regents

  • White Papers // Aug 2011

    FERMI: A FEmtocell Resource Management System for Interference Mitigation in OFDMA Networks

    The demand for increased spectral efficiencies is driving the next generation broadband access networks towards deploying smaller cells (femtocells) and sophisticated air interface technologies (Orthogonal Frequency Division Multiple Access or OFDMA). The dense deployment of femtocells however, makes interference and hence resource management both critical and extremely challenging. In this...

    Provided By UC Regents

  • White Papers // Aug 2011

    LEISURE: A Framework for Load-Balanced Network-Wide Traffic Measurement

    Network-wide traffic measurement is of interest to network operators to uncover global network behavior for the management tasks of traffic accounting, debugging or troubleshooting, security, and traffic engineering. Increasingly, sophisticated network measurement tasks such as anomaly detection and security forensic analysis are requiring in-depth fine-grained flow-level measurements. However, performing in-depth...

    Provided By UC Regents

  • White Papers // Jul 2011

    On the Empirical Performance of Self-Calibrating WiFi Location Systems

    The pervasive deployment of 802.11 in modern enterprise buildings has long made it an attractive technology for constructing indoor location services. To this end, a broad range of algorithms have been proposed to accurately estimate location from 802.11 signal strength measurements, some without requiring manual calibration for each physical location....

    Provided By UC Regents

  • White Papers // Jul 2011

    Enhanching in Vehicle Digital Maps Via GPS Crowdsourcing

    In this paper, the authors propose a simple and effective method to extend digital maps with the location and timing of stop-signs and traffic lights in a city, given GPS traces collected by on-road vehicles. Their system finds the location and timing of traffic lights and stop-signs using a small...

    Provided By UC Regents

  • White Papers // Jul 2011

    TouchLogger: Inferring Keystrokes On Touch Screen From Smartphone Motion

    Attacks that use side channels, such as sound and electromagnetic emanation, to infer keystrokes on physical keyboards are ineffective on smartphones without physical keyboards. The authors describe a new side channel, motion, on touch screen smartphones with only soft keyboards. Since typing on different locations on the screen causes different...

    Provided By UC Regents

  • White Papers // Jul 2011

    Cooperative Jamming for Secure Communications in MIMO Relay Networks

    Secure communications can be impeded by eavesdroppers in conventional relay systems. This paper proposes cooperative jamming strategies for two-hop relay networks where the eavesdropper can wiretap the relay channels in both hops. In these approaches, the normally inactive nodes in the relay network can be used as cooperative jamming sources...

    Provided By UC Regents

  • White Papers // Jul 2011

    No Plan Survives Contact: Experience With Cybercrime Measurement

    An important mode of empirical security research involves analyzing the behavior, capabilities, and motives of adversaries. By definition, such measurements cannot be conducted in controlled settings and require "Engagement" directly with adversaries, their infrastructure or their ecosystem. However, the operational complexities required to successfully carry out such measurements are significant...

    Provided By UC Regents

  • White Papers // Jul 2011

    Improving the Way We Design Games for Learning by Examining How Popular Video Games Teach

    One of the reasons why commercial video games are popular is that they effectively teach players how to play the game - in many cases as the player plays the game itself. This paper focuses on how to effectively integrate teaching "How to play a game" with teaching an "Instructional...

    Provided By UC Regents

  • White Papers // Jul 2011

    Variability of Location Management Costs With Different Mobilities and Timer Periods to Update Locations

    In this paper, the authors examine the location management costs in mobile communication networks utilizing the timer-based method. From the study of the probabilities that a mobile terminal changes a number of Location Areas between two calls, they identify a threshold value of 0.7 for the Call-to-Mobility Ratio (CMR) below...

    Provided By UC Regents

  • White Papers // Jun 2011

    Measuring Pay-Per-Install: The Commoditization of Malware Distribution

    Recent years have seen extensive diversification of the "Underground economy" associated with malware and the subversion of Internet-connected systems. This trend towards specialization has compelling forces driving it: miscreants readily apprehend that tackling the entire value-chain from malware creation to monetization in the presence of ever-evolving countermeasures poses a daunting...

    Provided By UC Regents

  • White Papers // Jun 2011

    BOTMAGNIFIER: Locating Spambots on the Internet

    Unsolicited bulk email (spam) is used by cyber-criminals to lure users into scams and to spread malware infections. Most of these unwanted messages are sent by spam botnets, which are networks of compromised machines under the control of a single (malicious) entity. Often, these botnets are rented out to particular...

    Provided By UC Regents

  • White Papers // May 2011

    Authenticated and Misuse-Resistant Encryption of Key-Dependent Data

    This paper provides a comprehensive treatment of the security of Authenticated Encryption (AE) in the presence of key-dependent data, considering the four variants of the goal arising from the choice of universal nonce or random nonce security and presence or absence of a header. The authors present attacks showing that...

    Provided By UC Regents

  • White Papers // May 2011

    Just-in-Time Compilation for FPGA Processor Cores

    Portability benefits have encouraged the trend of distributing applications using processor-independent instructions, a.k.a. bytecode, and executing that bytecode on an emulator running on a target processor. Transparent Just-In-Time (JIT) compilation of bytecode to native instructions is often used to increase application execution speed without sacrificing portability. Recent work has proposed...

    Provided By UC Regents

  • White Papers // May 2011

    Concurrently Secure Computation in Constant Rounds

    The authors study the problem of constructing concurrently secure computation protocols in the plain model, where no trust is required in any party or setup. While the well established UC framework for concurrent security is impossible to achieve in this setting, a meaningful notion of concurrent security based on Super-Polynomial...

    Provided By UC Regents

  • White Papers // May 2011

    Exploring the Effects of Feed-Forward and Feedback on Information Disclosure and User Experience in a Context-Aware Recommender System

    When disclosing information to a recommender system, users need to trade off its usefulness for receiving better recommendations with the privacy risks incurred through its disclosure. The paper describes a series of studies that will investigate the use of feed-forward and feedback messages to inform users about the potential usefulness...

    Provided By UC Regents

  • White Papers // May 2011

    RFID Assisted Vehicle Positioning in VANETs

    With technological advancement, recent VANET applications such as safe driving and emergency rescue often demand high position accuracy. Unfortunately, however, conventional localization systems, e.g., GPS, hardly meet new accuracy requirements. To overcome this limitation, this paper proposes an RFID-assisted localization system. The proposed system employs the DGPS concept to improve...

    Provided By UC Regents

  • White Papers // May 2011

    Some Issues in WSN, MANET and Cellular Security

    In this position paper, the authors address some current limitations and challenges as well as emerging directions in three related areas of secure communication: security in Wireless Sensor Networks - WSNs, security in Mobile Ad hoc NETworks - MANETs, and security in Cellular Phone Networks. Sensors that obtain information by...

    Provided By UC Regents

  • White Papers // May 2011

    Analyzing Interaction Communication Networks in Enterprises and Identifying Hierarchies

    With the proliferation of electronic modes of communication (e.g., e-mails, short messages), a group of people in an enterprise can form several distinct Communication Interaction Networks, or CINs for short. A CIN is essentially a graph representation of "Who talks to whom" among a group of individuals. In this paper,...

    Provided By UC Regents

  • White Papers // May 2011

    Correlated-Input Secure Hash Functions

    The authors undertake a general study of hash functions secure under correlated inputs, meaning that security should be maintained when the adversary sees hash values of many related high-entropy inputs. Such a property is satisfied by a random oracle, and its importance is illustrated by study of the "Avalanche effect,"...

    Provided By UC Regents

  • White Papers // May 2011

    Database-Agnostic Transaction Support for Cloud Infrastructures

    In this paper, the authors present and empirically evaluate the performance of Database-Agnostic Transaction (DAT) support for the cloud. Their design and implementation of DAT is scalable, fault-tolerant, and requires only that the datastore provide atomic, row-level access. Their approach enables applications to employ a single transactional datastore API that...

    Provided By UC Regents

  • White Papers // May 2011

    SAIL: A Scalable Approach for Wide-Area IP Mobility

    The Internet is becoming increasingly mobile, with not only smartphones outnumbering stationary hosts, but also cars, buses, trains and airplanes all coming online. This makes Internet mobility support more important than ever. However, the existing standard mobility support protocols, mainly Mobile IPv6 and NEtwork MObility (NEMO), suffer from triangle routing...

    Provided By UC Regents

  • White Papers // May 2011

    On the Symmetry of User Mobility in Wireless Networks

    In this paper analyzed WLAN - GPS -and synthetic traces that record mobility in a variety of network environments. The authors observe that from a macroscopic level, human mobility is symmetric. In other words, the number of users that move from point A to point B approximates the number of...

    Provided By UC Regents

  • White Papers // May 2011

    GQ: Practical Containment for Measuring Modern Malware Systems

    Measurement and analysis of modern malware systems such as botnets relies crucially on execution of specimens in a setting that enables them to communicate with other systems across the Internet. Ethical, legal, and technical constraints, however, demand containment of resulting network activity in order to prevent the malware from harming...

    Provided By UC Regents

  • White Papers // May 2011

    A Comparitive Study of Achievability of Security Against Related-Key Attack

    This paper begins with a practical contribution, namely a way to leverage the RKA security of blockciphers to provide RKA security for a suite of high-level primitives. This motivates a more general theoretical question, namely, when is it possible to transfer RKA security from a primitive P1 to a primitive...

    Provided By UC Regents

  • White Papers // Apr 2011

    Seeker - A Bandwidth-Based Association Control Framework for Wireless Mesh Networks

    The rapid deployment of wireless mesh networks across universities and enterprises, and the pervasiveness of mobile devices equipped with Wi-Fi connectivity, has resulted in a scenario wherein end users have the option to choose from a multitude of access points at any given location. Moreover, with the increasing availability of...

    Provided By UC Regents

  • White Papers // Apr 2011

    Programming Support for Distributed Optimization and Control in Cyber-Physical Systems

    Large-scale actuator control problems in Cyber-Physical Systems (CPSs) are often expressed within the networked optimization model. While significant advances have taken place in optimization techniques, their widespread adoption in practical implementations is impeded by the complexity of inter-node coordination and lack of programming support that is necessary for sharing information...

    Provided By UC Regents

  • White Papers // Apr 2011

    (Im)Possible Frontiers: A Comment

    The existence of mean-variance efficient positive portfolios - portfolios with no negative weights - is a key requirement for equilibrium in the Capital Asset Pricing Model (CAPM). Brennan and Lo (2010) define an "Impossible frontier" as a frontier on which all portfolios have at least one negative weight. They prove...

    Provided By UC Regents

  • White Papers // Apr 2011

    Collusion-Resilient Quality of Information Evaluation Based on Information Provenance

    The quality of information is crucial for decision making in many dynamic information sharing environments such as sensor and tactical networks. Information trustworthiness is an essential parameter in assessing the information quality. In this paper, the authors present a trust model to evaluate the trustworthiness of information as well as...

    Provided By UC Regents

  • White Papers // Apr 2011

    Digitizing Physical Objects in the Home

    Technology in the home has brought about a number of changes in the way things are being done. Particularly interesting is the question as to whether some ways of doing activities are now being replaced given the availability of technology at an affordable cost. The ownership of a home computer...

    Provided By UC Regents

  • White Papers // Apr 2011

    Systemic Sovereign Credit Risk: Lessons From The U.S. And Europe

    The authors study the nature of systemic sovereign credit risk using CDS spreads for the U.S. Treasury, individual U.S. states, and major European countries. Using a multifactor affine framework that allows for both systemic and sovereign-specific credit shocks, they find that there is considerable heterogeneity across U.S. and European issuers...

    Provided By UC Regents

  • White Papers // Mar 2011

    Database Scalability, Elasticity, and Autonomy in the Cloud

    The proliferation of technology in the past two decades has created an interesting dichotomy for users. There is very little disagreement that an individual's life is significantly enriched as a result of easy access to information and services using a wide spectrum of computing platforms such as personal workstations, laptop...

    Provided By UC Regents

  • White Papers // Mar 2011

    SenSec: A Scalable and Accurate Framework for Wireless Sensor Network Security Evaluation

    The use of Wireless Sensor Networks (WSNs) is expanding rapidly in a variety of fields. As the use of sensors evolves from merely capturing data to real-time event detection and response, sensor networks must provide accurate and authentic data to guarantee operational integrity. Security solutions are necessary to prevent malicious...

    Provided By UC Regents

  • White Papers // Mar 2011

    Learning From Repetitive Acquisitions: Evidence From The Time Between Deals

    Repetitive acquisitions involve benefits and costs. Benefits accrue from learning about the takeover process while costs involve integrating the combined firms. These benefits and costs are not directly observable from outside the firm but this paper proposes a simple model to infer their relative importance from the time between successive...

    Provided By UC Regents

  • White Papers // Mar 2011

    Usability of Display-Equipped RFID Tags for Security Purposes

    Recent emergence of high-end RFID tags capable of performing public key operations enables some new applications in commerce (e.g., RFID-enabled credit cards) and security (e.g., ePassports and access control badges). While the use of public key cryptography mitigates many difficult security issues, certain important usability-related issues remain, particularly, when RFID...

    Provided By UC Regents

  • White Papers // Jun 2009

    Long-Reach Passive Optical Networks

    With the advances in optical technology, the span of a broadband access network using Passive Optical Network (PON) technology can be increased from today's standard of 20 km to 100 km or higher. Such an extended-reach PON is known as Long-Reach PON (LR-PON). This technology can enable broadband access for...

    Provided By UC Regents

  • White Papers // Oct 2010

    A Data-First Architecture for Unstructured Wireless Networks

    The authors have returned to the drawing board to rethink the basic approach to unstructured wireless networks connected or disconnected multi-hop wireless networks whose topology is in a constant state of ux. Current protocols for these networks tend to adopt the Internet protocol stack, originally designed for static, wired networks....

    Provided By UC Regents

  • White Papers // Oct 2009

    Ziv-Lempel Data Compression

    Large text or graphics files are often compressed in order to save storage space or to speed up transmission when the file is shipped. Most operating systems have compression utilities, and some file transfer programs automatically compress, ship, and uncompress the file, without user intervention. However, a popular compression method...

    Provided By UC Regents

  • White Papers // Sep 2010

    Development And Freedom As Risk Management

    The author has argued that many development and freedom measures such as health, education, political and civil liberties are important constituents of human welfare. The author concur with conjecture that an important reason these measures affect human welfare is because they allow individuals to better cope with risk and uncertainty...

    Provided By UC Regents

  • White Papers // Oct 2010

    Safety-Guarantee Controller Synthesis for Cyber-Physical Systems

    The verification and validation of cyber-physical systems is known to be a difficult problem due to the different modeling abstractions used for control components and for software components. A recent trend to address this difficulty is to reduce the need for verification by adopting correct-by-design methodologies. According to the correct-by-design...

    Provided By UC Regents

  • White Papers // Apr 2009

    AZALIA: An A to Z Assessment of the Likelihood of Insider Attack

    The insider threat problem is increasing, both in terms of the number of incidents and their financial impact. To date, solutions have been developed to detect specific instances of insider attacks (e.g., fraud detection) and therefore use very limited information for input. In this paper the authors describe architecture for...

    Provided By UC Regents

  • White Papers // Jun 2009

    Some "Secure Programming" Exercises for an Introductory Programming Class

    Ideally, computer security should be an integral part of all programming courses. Beginning programming classes pose a particular challenge, because the students are learning basic concepts of programming. Thus, teaching them about buffer overflows as security problems, requiring an explanation of concepts such as "Smashing the stack," will confuse students...

    Provided By UC Regents

  • White Papers // Sep 2009

    Reflections on UNIX Vulnerabilities

    The UNIX operating system was developed in a friendly, collaborative environment without any particular predefined objectives. As it entered less friendly environments, expanded its functionality, and became the basis for commercial, infrastructure, and home systems, vulnerabilities in the system affected its robustness and security. This paper presents a brief history...

    Provided By UC Regents

  • White Papers // Sep 2010

    Ten Years Past and Ten Years From Now

    Ten years ago, computer security was an arcane discipline that many academics did not see as an interesting or deep research area. Today, that perception has changed. Information assurance and computer security touch every aspect of the lives, and the interconnections with more traditional academic disciplines such as analysis of...

    Provided By UC Regents

  • White Papers // Nov 2008

    Joint Guidance on the Application of the Family Educational Rights and Privacy Act (FERPA) and the Health Insurance Portability and Accountability Act of 1996 (HIPAA) to Student Health Records

    The purpose of this guidance is to explain the relationship between the Family Educational Rights and Privacy Act (FERPA) and the Health Insurance Portability and Accountability Act of 1996 (HIPAA) Privacy Rule, and to address apparent confusion on the part of school administrators, health care professionals, and others as to...

    Provided By UC Regents

  • White Papers // Jul 2009

    Position Based Cryptography

    The authors consider what constitutes identities in cryptography. Typical examples include people's name and social-security number, or their Fingerprint/iris-scan, or their address, or their (non-revoked) public-key coming from some trusted public-key infrastructure. In many situations, however, where people are defines their identity. For example, they know the role of a...

    Provided By UC Regents

  • White Papers // Nov 2009

    Secure Message Transmission With Small Public Discussion

    In the problem of Secure Message Transmission in the Public Discussion model (SMT-PD), a Sender wants to send a message to a Receiver privately and reliably. Sender and Receiver are connected by n channels, up to t < n of which may be maliciously controlled by a computationally unbounded adversary,...

    Provided By UC Regents

  • White Papers // Jan 2011

    Induced Churn as Shelter From Routing-Table Poisoning

    Structured overlays are an important and powerful class of overlay networks that has emerged in recent years. They are typically targeted at peer-to-peer deployments involving millions of user-managed machines on the Internet. In this paper the authors address routing-table poisoning attacks against structured overlays, in which adversaries attempt to intercept...

    Provided By UC Regents

  • White Papers // Sep 2009

    Resettable Public-Key Encryption: How to Encrypt on a Virtual Machine

    Typical security models used for proving security of deployed cryptographic primitives do not allow adversaries to rewind or reset honest parties to an earlier state. Thus, it is common to see cryptographic protocols rely on the assumption that fresh random numbers can be continually generated. In this paper, the authors...

    Provided By UC Regents

  • White Papers // Sep 2009

    Fuzzy Privacy Preserving Peer-to-Peer Reputation Management

    The P2PRep algorithm is a reputation-management mechanism in which a peer uses fuzzy techniques to compute local reputations and aggregates these results to compute a global reputation for another peer which has made an offer of service. While this mechanism is known to be extremely effective in the presence of...

    Provided By UC Regents

  • White Papers // May 2009

    Deterministic Relay Networks With State Information

    Motivated by fading channels and erasure channels, the problem of reliable communication over deterministic relay networks is studied, in which relay nodes receive a function of the incoming signals and a random network state. An achievable rate is characterized for the case in which destination nodes have full knowledge of...

    Provided By UC Regents

  • White Papers // Feb 2010

    Secure, Selective Group Broadcast in Vehicular Networks Using Dynamic Attribute Based Encryption

    Ciphertext-Policy Attribute Based Encryption (CPABE) provides an encrypted access control mechanism for broadcasting messages. Basically, a sender encrypts a message with an access control policy tree which is logically composed of attributes; receivers are able to decrypt the message when their attributes satisfy the policy tree. A user's attributes stand...

    Provided By UC Regents

  • White Papers // Jun 2010

    CapStart: A Path Capacity Adaptive TCP Slow Start for High Speed Network

    In this paper, the authors introduce CapStart TCP, an adaptive Slow Start scheme that consistently achieves fast TCP file transfer times regardless of high speed network scenario. Once the TCP session is established, they estimate TCP session path capacity scenario, and tune the transport protocol to deliver fast transfer times....

    Provided By UC Regents

  • White Papers // Dec 2009

    GentleCool: Cooling Aware Proactive Workload Scheduling in Multi-Machine Systems

    In state of the art systems, workload scheduling and server fan speed operate independently leading to cooling inefficiencies. In this paper the authors propose GentleCool, a proactive multi-tier approach for significantly lowering the fan cooling costs without compromising the performance. The technique manages the fan speed through intelligently allocating the...

    Provided By UC Regents

  • White Papers // Nov 2009

    Hybrid Dynamic Energy and Thermal Management in Heterogeneous Embedded Multiprocessor SoCs

    Heterogeneous MultiProcessor System-on-Chips (MPSoCs) which consist of cores with various power and performance characteristics can customize their configuration to achieve higher performance per Watt. On the other hand, inherent imbalance in power densities across MPSoCs leads to non-uniform temperature distributions, which affect performance and reliability adversely. In addition, managing temperature...

    Provided By UC Regents

  • White Papers // Oct 2010

    Package-Aware Scheduling of Embedded Workloads for Temperature and Energy Management on Heterogeneous MPSoCs

    In this paper, the authors present PASTEMP, a solution for Package Aware Scheduling for Thermal and Energy management using Multi-Parametric programming in heterogeneous embedded multiprocessor SoCs (MPSoCs). Based on the current thermal state of the system and current performance requirements of the workload, PASTEMP finds thermally safe and energy efficient...

    Provided By UC Regents

  • White Papers // Sep 2009

    Energy Efficient Design of Battery Powered Embedded Systems

    Energy-efficient design of battery-powered systems demands optimizations in both hardware and software. The authors present a modular approach for enhancing instruction level simulators with cycle-accurate simulation of energy dissipation in embedded systems. The methodology has tightly coupled component models thus making the approach more accurate. Performance and energy computed by...

    Provided By UC Regents

  • White Papers // May 2011

    Analyzing Interaction Communication Networks in Enterprises and Identifying Hierarchies

    With the proliferation of electronic modes of communication (e.g., e-mails, short messages), a group of people in an enterprise can form several distinct Communication Interaction Networks, or CINs for short. A CIN is essentially a graph representation of "Who talks to whom" among a group of individuals. In this paper,...

    Provided By UC Regents

  • White Papers // Mar 2010

    Comparing BitTorrent Clients in the Wild: The Case of Download Speed

    BitTorrent (BT) is currently the main P2P protocol used for sharing large files over the Internet. It is therefore important to understand the performance characteristics of existing real-world BT implementations (clients). In this paper, the authors measure the download speed of over 10 million BT users over one month. Surprisingly,...

    Provided By UC Regents

  • White Papers // Jan 2010

    Mapping the Spatiotemporal Dynamics of Calcium Signaling in Cellular Neural Networks Using Optical Flow

    An optical flow gradient algorithm was applied to spontaneously forming networks of neurons and glia in culture imaged by fluorescence optical microscopy in order to map functional calcium signaling with single pixel resolution. Optical flow estimates the direction and speed of motion of objects in an image between subsequent frames...

    Provided By UC Regents

  • White Papers // Apr 2010

    Parallel Computing on the Berkeley NOW

    The UC Berkeley Network Of Workstations (NOW) project demonstrates a new approach to large-scale system design enabled by technology advances that provide inexpensive, low latency, high bandwidth, scalable interconnection networks. This paper provides an overview of the hardware and software architecture of NOW and reports on the performance obtained at...

    Provided By UC Regents

  • White Papers // Apr 2010

    Managing Concurrent Access for Shared Memory Active Messages

    Passing messages through shared memory plays an important role on symmetric multiprocessors and on Clumps. The management of concurrent access to message queues is an important aspect of design for shared memory message passing systems. Using both microbenchmarks and applications, this paper compares the performance of concurrent access algorithms for...

    Provided By UC Regents

  • White Papers // Jan 2011

    Distributed Web Crawling Over DHTs

    In this paper, the authors present the design and implementation of a distributed web crawler. They begin by motivating the need for such a crawler, as a basic building block for decentralized web search applications. The distributed crawler harnesses the excess bandwidth and computing resources of clients to crawl the...

    Provided By UC Regents

  • White Papers // Apr 2010

    Teaching Environmentalism: Mindfulness, Activism, and Student Performance

    Academics that meditate and engage in other contemplative practices increasingly incorporate their practice into courses as a means of increasing students' capacity for focus and attention, social awareness, and activism. Do they also improve student's grades? Attention in class, especially if it extends to coursework completed outside of class and...

    Provided By UC Regents

  • White Papers // Jan 2011

    A Dynamic Operating System for Sensor Nodes

    Sensor network nodes exhibit characteristics of both embedded systems and general-purpose systems. They must use little energy and be robust to environmental conditions, while also providing common services that make it easy to write applications. In TinyOS, the current state of the art in sensor node operating systems, reusable components...

    Provided By UC Regents

  • White Papers // Oct 2009

    Scalable Access Control For Web Services

    Controlling access to a large distributed service is a potentially error prone process that may negatively impact request throughput and usability. The Authorization-Based Access Control (or ABAC) URL rewriter solves this problem by providing locally verifiable authorizations and delegation tracking compatible with common web tools. The access control mechanism is...

    Provided By UC Regents

  • White Papers // Oct 2009

    Design, Implementation and Deployment of PAIRwise

    Increased access to the Internet has dramatically increased the sources from which students can deliberately or accidentally copy information. This paper discusses the motivation to design, implement, and deploy an Internet based plagiarism detection system, called PAIRwise, to address this growing problem. The authors give details as to how they...

    Provided By UC Regents

  • White Papers // Feb 2010

    Probabilistic Declarative Information Extraction

    Unstructured text represents a large fraction of the world's data. It often contains snippets of structured information (e.g., people's names and zip codes). Information Extraction (IE) techniques identify such structured information in text. In recent years, database research has pursued IE on two fronts: Declarative languages and systems for managing...

    Provided By UC Regents

  • White Papers // Jul 2009

    QueRIE: A Query Recommender System Supporting Interactive Database Exploration

    This demonstration presents QueRIE, a recommender system that supports interactive database exploration. This system aims at assisting non-expert users of scientific databases by generating personalized query recommendations. Drawing inspiration from Web recommender systems, QueRIE tracks the querying behavior of each user and identifies potentially "Interesting" parts of the database related...

    Provided By UC Regents

  • White Papers // Oct 2010

    New Constructions for UC Secure Computation Using Tamper-Proof Hardware

    The Universal Composability framework was introduced by Canetti to study the security of protocols which are concurrently executed with other protocols in a network environment. Unfortunately it was shown that in the so called plain model, a large class of functionalities cannot be securely realized. These severe impossibility results motivated...

    Provided By UC Regents

  • White Papers // Oct 2009

    An Energy Efficient Wireless Communication Mechanism for Sensor Node Cluster Heads

    This paper presents an efficient mechanism to achieve significant energy savings in heterogeneous wireless sensor networks such as HPWREN. Environmental sensors are typically located in remote and hard-to-reach locations far from the main high-bandwidth data links. Therefore the sensed data needs to be routed through multiple hops before reaching the...

    Provided By UC Regents

  • White Papers // Dec 2009

    Scalable Detection of Similar Code: Techniques and Applications

    Similar code, also known as cloned code, commonly exists in large software. Studies show that code duplication can incur higher software maintenance cost and more software defects. Thus, detecting similar code and tracking its migration have many important applications, including program understanding, refactoring, optimization, and bug detection. This dissertation presents...

    Provided By UC Regents

  • White Papers // Jan 2011

    Modeling and Dynamic Management of 3D Multicore Systems With Liquid Cooling

    Three-Dimensional (3D) circuits reduce communication delay in multicore SoCs, and enable efficient integration of cores, memories, sensors, and RF devices. However, vertical integration of layers exacerbates the reliability and thermal problems, and cooling efficiency becomes a limiting factor. Liquid cooling is a solution to overcome the accelerated thermal problems imposed...

    Provided By UC Regents

  • White Papers // Jan 2011

    Temperature-And Cost-Aware Design of 3D Multiprocessor Architectures

    3D stacked architectures provide significant benefits in performance, footprint and yield. However, vertical stacking increases the thermal resistances, and exacerbates temperature induced problems that affect system reliability, performance, leakage power and cooling cost. In addition, the overhead due to Through-Silicon-Vias (TSVs) and scribe lines contribute to the overall area, affecting...

    Provided By UC Regents

  • White Papers // Jan 2011

    Temperature-Aware MPSoC Scheduling for Reducing Hot Spots and Gradients

    Thermal hot spots and temperature gradients on the die need to be minimized to manufacture reliable systems while meeting energy and performance constraints. In this paper, the authors solve the task scheduling problem for Multiprocessor System-on-Chips (MPSoCs) using Integer Linear Programming (ILP). The goal of the optimization is minimizing the...

    Provided By UC Regents