UC Regents

Displaying 1-40 of 313 results

  • White Papers // Apr 2015

    Per-Core DVFS With Switched-Capacitor Converters for Energy Efficiency in Manycore Processors

    Integrating multiple power converters on-chip improves energy efficiency of many core architectures. Switched Capacitor (SC) DC-DC converters are compatible with conventional CMOS processes, but traditional implementations suffer from limited conversion efficiency. The authors propose a dynamic voltage and frequency scaling scheme with SC converters that achieves high converter efficiency by...

    Provided By UC Regents

  • White Papers // Nov 2014

    Constrained Interpolation for Guided Logic Synthesis

    Craig interpolation is a known method for expressing a target function f as a function of a given set of base functions G. The resulting interpolant represents the dependency function h, such that f

    Provided By UC Regents

  • White Papers // Apr 2014

    m-Inductive Properties of Logic Circuits

    In this paper, the authors introduce the concept of m-inductiveness over a set of signals S in a sequential circuit. The m-inductive property can be used for equivalence-checking or improved sequential optimization. When applied to verification, only equivalency of signals in S and primary outputs need to be checked. When...

    Provided By UC Regents

  • White Papers // Apr 2014

    Enumeration of Irredundant Circuit Structures

    A new approach to Boolean decomposition and matching is proposed. It uses enumeration of all support-reducing decompositions of Boolean functions up to 16 inputs. The approach is implemented in a new framework that compactly stores multiple circuit structures. The method makes use of pre-computations performed offline, before the framework is...

    Provided By UC Regents

  • 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 // Mar 2012

    Logic Synthesis for Disjunctions of Boolean Functions

    In this paper, the authors develop theoretical foundations and present a practical algorithm for optimizing multi-output Boolean function M(x) whose outputs are combined using Boolean OR operator into a single-output Boolean function S(x). The proposed algorithm simplifies the logic structure of function M(x) and may change or remove some of...

    Provided By UC Regents

  • White Papers // Mar 2012

    Sequential Logic Synthesis Using Symbolic Bi-Decomposition

    The authors review some general theorems, proved in a previous paper, about situations when SEC can be reduced to a Combinational Equivalence Checking (CEC) problem. Then, they show how these can be applied to the verification of sequentially clock-gated circuits. A new method based on these theorems was applied to...

    Provided By UC Regents

  • White Papers // Feb 2012

    Multiple-Input Relay Design for More Compact Implementation of Digital Logic Circuits

    Multiple-input relays have been proposed to implement digital logic more compactly than single-input relays. Although a multiple-input relay has a larger footprint than a single-input relay for the same input voltage range, the reduction in device count is advantageous because of the significant area required for the suspension beams and...

    Provided By UC Regents

  • White Papers // Nov 2011

    Characterization of Dynamic SRAM Stability in 45 nm CMOS

    Optimization of SRAM yield using dynamic stability metrics has been evaluated in the past to ensure continued scaling of bit-cell size and supply voltage in future technology nodes. Various dynamic stability metrics have been proposed but they have not been used in practical failure analysis and compared with conventional static...

    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

    Quasi-Planar Bulk CMOS Technology for Improved SRAM Scalability

    Following Moore's law, transistor density has roughly doubled with each new CMOS technology generation largely due to the steady miniaturization of the transistor. A simple approach for manufacturing quasi-planar bulk MOSFET structures is demonstrated and shown to be effective not only for improving device performance but also for reducing variation...

    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 // Jul 2011

    Performance and Yield Benefits of Quasi-Planar Bulk CMOS Technology for 6-T SRAM at the 22-nm Node

    The performance and threshold voltage variability of quasi-planar bulk MOSFETs are compared against those of conventional bulk MOSFETs, via Three-Dimensional (3-D) device simulations with gate line-edge roughness and atomistic doping profiles, at 25nm gate length. The nominal performance of Six Transistor (6-T) SRAM cells is studied via 3-D simulation of...

    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 // 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 // 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 // Mar 2011

    A Method for Estimating Access Delay Distribution in IEEE 802.11 Networks

    The volume of multimedia traffic over wireless networks has been steadily increasing over the past decade. Unlike web browsing applications, multimedia data needs to satisfy stringent delay requirements since late packets are as good as lost packets. In this paper, the authors present a framework for the nodes in 802.11...

    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 // Aug 2010

    The Potential of Cloud Computing: Opportunities and Challenges

    Cloud computing is not a flash in the pan: it has the potential to be as influential and transformative as the microprocessor. It opens genuinely new opportunities for more agile innovation, faster and higher quality research, and agile entrepreneurship, and exposes direct incentives and opportunities for more energy-efficient computing. While...

    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

    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 // 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 // Jan 2011

    Em: A Software Environment for Developing and Deploying Wireless Sensor Networks

    Em is a software environment for developing and deploying Wireless Sensor Network (WSN) applications on Linux-class hardware platforms (called "Microservers"). Em consists of libraries that implement message-passing IPC primitives, tools that support simulation, emulation, and visualization of live systems, both real and simulated, and services that support for networking, sensing,...

    Provided By UC Regents

  • White Papers // Jan 2011

    Querying and Routing in Next-Generation Networks

    The author proposes the use of recursive queries as an interface for querying distributed network graph structures. Recursive queries allow a query result to be defined in terms of itself. This is particularly useful for querying network graphs that exhibit recursive structures. To query these distributed graphs over the Internet,...

    Provided By UC Regents

  • White Papers // Dec 2009

    Rate Adaptation in Congested Wireless Networks Through Real-Time Measurements

    Rate adaptation is a critical component that impacts the performance of IEEE 802.11 wireless networks. In congested networks, traditional rate adaptation algorithms have been shown to choose lower data-rates for packet transmissions, leading to reduced total network throughput and capacity. A primary reason for this behavior is the lack of...

    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 // Oct 2010

    A Quantitative Comparison of Communication Paradigms for MANETs

    Mobile Ad hoc NETworks (MANET) present a challenging area for application development. The combination of mobile nodes and wireless communication can create highly dynamic networks with frequent disconnections and unpredictable availability. Several language paradigms have been applied to MANETs, but there has been no quantitative comparison of alternative approaches. This...

    Provided By UC Regents

  • White Papers // Sep 2010

    Local Estimation of Collision Probabilities in 802.11 WLANs: An Experimental Study

    Current 802.11 networks do not typically achieve the maximum potential throughput despite link adaptation and cross-layer optimization techniques designed to alleviate many causes of packet loss. A primary contributing factor is the difficulty in distinguishing between various causes of packet loss, including collisions caused by high network use, co-channel interference...

    Provided By UC Regents

  • White Papers // Jan 2011

    MIST: Distributed Indexing and Querying in Sensor Networks using Statistical Models

    The modeling of high level semantic events from low level sensor signals is important in order to understand distributed phenomena. For such content-modeling purposes, transformation of numeric data into symbols and the modeling of resulting symbolic sequences can be achieved using statistical models - Markov Chains (MCs) and Hidden Markov...

    Provided By UC Regents

  • White Papers // Oct 2009

    Vshmem: Shared-Memory OS-Support for Multicore-based HPC systems

    As a result of the huge performance potential of multi-core microprocessors, HPC infrastructures are rapidly integrating them into their architectures in order to expedite the performance growth of the next generation HPC systems. However, as the number of cores per processor increase to 100 or 1000s of cores, they are...

    Provided By UC Regents

  • White Papers // Aug 2009

    Verification of String Manipulating Programs Using Multi-Track Automata

    Verification of string manipulation operations is a crucial problem in computer security. The authors present a new symbolic string verification technique that can be used to prove that vulnerabilities that result from improper string manipulation do not exist in a given program. They formally characterize the string verification problem as...

    Provided By UC Regents

  • White Papers // Aug 2009

    Tackling Bidder Collusion in Dynamic Spectrum Auctions (Extended)

    Dynamic spectrum auction is an effective solution to manage spectrum across many small networks. As the number of participants grows, collusion poses a serious threat to auction performance. Small groups of colluding bidders can make use of the interference constraints to manipulate auction outcomes, leading to unfair spectrum distribution and...

    Provided By UC Regents

  • White Papers // Jul 2009

    Mining the Network Behavior of Bots

    A botnet is a network of compromised hosts that fulfills the malicious intents of an attacker. Once installed, a bot is typically used to steal sensitive information, send SPAM, perform DDoS attacks, and other illegal activities. Research in botnet detection has been quite prolific in the past years, producing detection...

    Provided By UC Regents

  • White Papers // Jun 2009

    Generating Vulnerability Signatures for String Manipulating Programs Using Automata-based Forward and Backward Symbolic Analyses

    Given a program and an attack pattern (specified as a regular expression), the authors automatically generate string-based vulnerability signatures, i.e., a characterization that includes all malicious inputs that can be used to generate attacks. They use an automata-based string analysis framework. Using forward reachability analysis they compute an over-approximation of...

    Provided By UC Regents

  • White Papers // Jun 2009

    Spectrum Allocation for Frequency-Agile Radio Networks under Physical Interference Models

    Spectrum frequency allocation problems are fundamental problems in wireless spectrum auctions and wireless LAN management. Due to their complexity, most existing proposals simplify the allocation problems by reducing physical interference to a graph-based interference model. In this paper, the authors propose LIGHTHOUSE, a new line of efficient approximation algorithms that...

    Provided By UC Regents

  • White Papers // Jun 2009

    In-Depth Evaluation of Popular Interest Point Detectors on Video Streams

    The authors present an in-depth evaluation of popular interest point detectors, which, in contrast to existing evaluations, is targeted towards the application in visual tracking and augmented reality. In particular, candidate algorithms, testbed, and performance criteria are chosen with respect to the application of visual tracking. They evaluate the impact...

    Provided By UC Regents

  • White Papers // Aug 2009

    Thread Cooperation in Multicore Architectures for Frequency Counting Over Multiple Data Streams

    Many real-world data stream analysis applications such as network monitoring, click stream analysis and others require combining multiple streams of data arriving from multiple sources. This is referred to as multi-stream analysis. To deal with high stream arrival rates, it is desirable that such systems be capable of supporting very...

    Provided By UC Regents

  • White Papers // Jun 2009

    Anonymizing Edge-Weighted Social Network Graphs

    The increasing popularity of social networks has initiated a fertile research area in information extraction and data mining. Although such analysis can facilitate better understanding of sociological, behavioral, and other interesting phenomena, there is growing concern about personal privacy being breached, thereby requiring effective anonymization techniques. If the authors consider...

    Provided By UC Regents

  • White Papers // Jan 2011

    Efficient Algorithms and Routing Protocols for Handling Transient Single Node Failures

    Single node failures represent more than 85% of all node failures in the today's large communication networks such as the Internet. Also, these node failures are usually transient. Consequently, having the routing paths globally recomputed does not pay off since the failed nodes recover fairly quickly, and the recomputed routing...

    Provided By UC Regents

  • White Papers // Dec 2010

    Managing Traffic Growth in Next-Generation Telecom Networks

    This dissertation investigates how to optimally manage the traffic and its growth as well as the resources in a telecom network using optical Wavelength-Division Multiplexing (WDM) technology. A part of this dissertation addresses the Traffic Engineering (TE) problem, which determines how to set up explicit routes between source-destination pairs for...

    Provided By UC Regents

  • White Papers // Dec 2009

    Adaptivity in Data Stream Mining

    In recent years data streams became a ubiquitous source of information, and thus stream mining emerged as a new field in database research. Due to the inherently dynamic nature of data streams, stream mining algorithms benefit from being adaptive to changes in the properties of a data stream. In addition,...

    Provided By UC Regents

  • White Papers // Sep 2010

    Scalable Nearest Neighbors with Guarantees in Large and Composite Networks

    The authors address the problem of k Nearest Neighbor (kNN) search in networks, according to a random walk proximity measure called Effective Importance. Their approach retrieves the exact top neighbors at query time without relying on off-line indexing or summaries of the entire network. This makes it suitable for very...

    Provided By UC Regents

  • White Papers // Jul 2010

    Concurrent Collection as an Operating System Service for Cross-Runtime Cross-Language Memory Management

    The authors present GC-as-a-Service (GaS), a cross-runtime, cross-language Garbage Collection (GC) library that can be used to simplify the implementation of runtime systems, and that exploits available multicore technologies. GaS decouples GC from other runtime components and exposes a fine-grain API for use by GC-cooperative runtimes of different programming languages...

    Provided By UC Regents

  • White Papers // Aug 2010

    Understanding the Potential of Interpreter-based Optimizations for Python

    The increasing popularity of scripting languages as general purpose programming environments calls for more efficient execution. Most of these languages, such as Python, Ruby, PHP, and JavaScript are interpreted. Interpretation is a natural implementation given the dynamic nature of these languages and interpreter portability has facilitated wide-spread use. In this...

    Provided By UC Regents

  • White Papers // Jul 2010

    HengHa: Data Harvesting Detection on Hidden Databases

    The back-end databases of web-based applications are a major data security concern to enterprises. The problem becomes more critical with the proliferation of enterprises hosted web applications in the cloud. While much prior work has concentrated on the malicious attacks that try to break into the database by using vulnerabilities...

    Provided By UC Regents

  • White Papers // Jul 2010

    TranslatAR: A Mobile Augmented Reality Translator on the Nokia N900

    Researchers have long been interested in the synergy between portability and computing power but had been limited by unwieldy, uncommonly used devices. The latest generation of mobile phones, i.e. 'Smartphones', are equipped with hardware powerful enough to develop novel, interesting applications which allow users to directly interact with the world...

    Provided By UC Regents

  • White Papers // Jun 2010

    Highly Parallel Sparse Matrix-Matrix Multiplication

    Generalized sparse matrix-matrix multiplication is a key primitive for many high performance graph algorithms as well as some linear solvers such as multigrid. The authors present the first parallel algorithms that achieve increasing speedups for an unbounded number of processors. Their algorithms are based on two-dimensional block distribution of sparse...

    Provided By UC Regents

  • White Papers // Jul 2010

    Live Database Migration for Elasticity in a Multitenant Database for Cloud Platforms

    The growing popularity of cloud computing as a platform for deploying internet scale applications has seen a large number of web applications being deployed in the cloud. These applications (or tenants) are typically characterized by small data footprints, different schemas, and variable load patterns. Scalable multitenant DataBase Management Systems (DBMS)...

    Provided By UC Regents

  • White Papers // Apr 2010

    Who's Driving this Cloud? Towards Efficient Migration for Elastic and Autonomic Multitenant Databases

    The success of cloud computing as a platform for deploying web-applications has led to a deluge of applications characterized by small data footprints but unpredictable access patterns. An autonomic and scalable multitenant DataBase Management System (DBMS) is therefore an important component of the software stack for platforms supporting these applications....

    Provided By UC Regents

  • White Papers // Mar 2010

    ElasTraS: An Elastic, Scalable, and Self Managing Transactional Database for the Cloud

    Cloud computing has emerged as a pervasive platform for deploying scalable and highly available Internet applications. To facilitate the migration of data-driven applications to the cloud: elasticity, scalability, fault-tolerance, and self-manageability (henceforth referred to as cloud features) are fundamental requirements for DataBase Management Systems (DBMS) driving such applications. Even though...

    Provided By UC Regents

  • White Papers // Feb 2010

    Key-Value Datastores Comparison in AppScale

    The authors present a simple framework that employs a single API - the Datastore API from the Google App Engine cloud computing platform - to interface to different open source distributed database technologies in use today. They use the framework to "Plug in" different databases to the API so that...

    Provided By UC Regents

  • White Papers // Jan 2011

    AppScale: Open-Source Platform-as-a-Service

    AppScale is a scalable, distributed, and fault tolerant cloud runtime system that the authors have developed at the University of California, Santa Barbara as part of their research into the next generation of programming systems. In particular, AppScale is a cloud platform, i.e. a Platform-as-a-Service (PaaS) cloud fabric that executes...

    Provided By UC Regents

  • White Papers // Aug 2010

    A static, packer-agnostic Filter to detect similar malware samples

    The steadily increasing number of malware variants is becoming a significant problem, clogging the input queues of automated analysis tools and polluting malware repositories. The generation of malware variants is made easy by automatic packers and polymorphic engines, which can produce many distinct versions of a single executable using compression...

    Provided By UC Regents

  • White Papers // Oct 2010

    A Comprehensive Framework for Secure Query Processing on Relational Data in The Cloud

    Data security in the cloud is a big concern that blocks the widespread use of the cloud for relational data management. First, to ensure data security, data confidentiality needs to be provided when data resides in storage as well as when data is dynamically accessed by queries. Prior works on...

    Provided By UC Regents

  • White Papers // Mar 2011

    Memory Management for Multi-Language Multi-Runtime Systems on Multi-Core Architectures

    To manage the increasing complexity of software, developers employ a number of different strategies. These include using high-level, type-safe, object-oriented programming languages, executing applications within Managed Runtime Environments (MREs), modularizing software into independent isolated components, and maximizing programmer productivity by implementing each component in the most-suitable language. Moreover, administrators and...

    Provided By UC Regents

  • White Papers // Jul 2010

    Collection of Time series of appetite-related sensations using a handheld computer: a case study

    The authors present a case study in the design and subsequent use of "OKMO", a software program for the quantitative assessment of subjective appetite-related sensations, using a visual scale and running on a handheld computing device. OKMO runs on inexpensive Palm devices (PalmOS 4), and was built using only free...

    Provided By UC Regents