Carnegie Mellon University

Displaying 1-40 of 501 results

  • White Papers // Dec 2014

    Approximate Lifted Inference with Probabilistic Databases

    In this paper, the authors propose a new approach for approximate evaluation of P-hard queries with probabilistic databases. In their approach, every query is evaluated entirely in the database engine by evaluating a fixed number of query plans, each providing an upper bound on the true probability, then taking their...

    Provided By Carnegie Mellon University

  • White Papers // Jul 2014

    Phinding Phish: Evaluating Phishing Tools

    "There are currently dozens of freely available tools to combat phishing and other web-based scams, many of which are web browser extensions that warn users when they are browsing a suspected phishing site. The authors developed an automated test bed for testing anti-phishing tools. They used 200 verified phishing URLs...

    Provided By Carnegie Mellon University

  • White Papers // Jul 2014

    LAPWiN: Location-Aided Probing for Protecting User Privacy in Wi-Fi Networks

    Efficient Wi-Fi probing has been demonstrated to leak sensitive user information. During the probing process, Wi-Fi clients transmit the names of previously known Wi-Fi Access Points (APs) in plaintext. An eavesdropper can easily collect the information leaked by this Wi-Fi probing process to mount numerous attacks, such as fake AP...

    Provided By Carnegie Mellon University

  • White Papers // May 2014

    Studying the Effectiveness of Security Images in Internet Banking

    Security images are often used as part of the login process on internet banking websites, under the theory that they can help foil phishing attacks. Previous studies, however, have yielded inconsistent results about users' ability to notice that a security image is missing and their willingness to log in even...

    Provided By Carnegie Mellon University

  • White Papers // May 2014

    Characterizing Application Memory Error Vulnerability to Optimize Datacenter Cost Via Heterogeneous-Reliability Memory

    Memory devices represent a key component of datacenter Total Cost of Ownership (TCO), and techniques used to reduce errors that occur on these devices increase this cost. Existing approaches to providing reliability for memory devices pessimistically treat all data as equally vulnerable to memory errors. The authors' key insight is...

    Provided By Carnegie Mellon University

  • White Papers // Mar 2014

    All Your Screens are Belong to Us: Attacks Exploiting the HTML5 Screen Sharing API

    HTML5 changes many aspects in the browser world by introducing numerous new concepts; in particular, the new HTML5 screen sharing API impacts the security implications of browsers tremendously. One of the core assumptions on which browser security is built is that there is no cross-origin feedback loop from the client...

    Provided By Carnegie Mellon University

  • White Papers // Mar 2014

    The Heterogeneous Block Architecture

    This paper makes two new observations that lead to a new heterogeneous core design. First, the authors observe that most serial code exhibits fine-grained heterogeneity: at the scale of tens or hundreds of instructions, regions of code fit different micro-architectures better (at the same point or at different points in...

    Provided By Carnegie Mellon University

  • White Papers // Feb 2014

    Predictable Coherent Caching with Incoherent Caches

    Caches are a well known hardware construct for improving energy consumption and average performance by keeping frequently-used data near processing resources. Yet, at the same time, they form a major hurdle for worst-case execution time analyses, in particular if they are shared between multiple cores. Exploiting that most shared data...

    Provided By Carnegie Mellon University

  • White Papers // Feb 2014

    SpringFS: Bridging Agility and Performance in Elastic Distributed Storage

    The elastic storage systems can be expanded or contracted to meet current demand, allowing servers to be turned off or used for other tasks. However, the usefulness of an elastic distributed storage system is limited by its agility: how quickly it can increase or decrease its number of servers. Due...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2014

    Toward Strong, Usable Access Control for Shared Distributed Data

    As non-expert users produce increasing amounts of personal digital data, usable access control becomes critical. Current approaches often fail, because they insufficiently protect data or confuse users about policy specification. This paper presents penumbra, a distributed file system with access control designed to match users' mental models while providing principled...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2014

    Improving Cache Performance by Exploiting Read-Write Disparity

    Cache read misses stall the processor if there are no independent instructions to execute. In contrast, most cache write misses are off the critical path of execution, since writes can be buffered in the cache or the store buffer. With few exceptions, cache lines that serve loads are more critical...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2014

    Agentless Cloud-wide Streaming of Guest File System Updates

    The authors propose a non-intrusive approach for monitoring Virtual Machines (VMs) in the cloud. At the core of this approach is a mechanism for selective real-time monitoring of guest file updates within VM instances. This mechanism is agentless, requiring no guest VM support. It has low virtual I/O overhead, low...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2014

    Improving DRAM Performance by Parallelizing Refreshes with Accesses

    Modern main memory is predominantly built using Dynamic Random Access Memory (DRAM) cells. A DRAM cell consists of a capacitor to store one bit of data as electrical charge. The capacitor leaks charge over time, causing stored data to change. As a result, DRAM requires an operation called refresh that...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2014

    Bounding Memory Interference Delay in COTS-based Multi-Core Systems

    In Commercial-Off-The-Shelf (COTS) multi-core systems, a task running on one core can be delayed by other tasks running simultaneously on other cores due to interference in the shared DRAM main memory. Such memory interference delay can be large and highly variable, thereby posing a significant challenge for the design of...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2014

    ARP Attacks in Wireless Ad Hoc Networks

    Previous research to secure ad hoc network protocols concentrates on key distribution and on securing the routing protocol. Unfortunately, securing the routing layer is not sufficient to secure the ad hoc network, as lower layer and upper layer communication protocols remain vulnerable to attack. In this paper, the authors illustrate...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2014

    Matching Database Access Patterns to Storage Characteristics

    Database storage managers employ sophisticated algorithms attempting to exploit the performance available inside today's storage systems. However, because the communication between the Storage Manager (SM) and a storage device is limited by a high-level protocol, both the SM and the device make decisions largely in isolation and do not realize...

    Provided By Carnegie Mellon University

  • White Papers // Dec 2013

    Exploiting Compressed Block Size as an Indicator of Future Reuse

    The authors introduce a set of new Compression-Aware Management Policies (CAMP) for on-chip caches that employ data compression. Their management policies are based on two key ideas. First, they show that it is possible to build a more efficient management policy for compressed caches if the compressed block size is...

    Provided By Carnegie Mellon University

  • White Papers // Dec 2013

    Tetrisched: Space-Time Scheduling for Heterogeneous Datacenters

    Tetrisched is a new scheduler that explicitly considers both job-specific preferences and estimated job runtimes in its allocation of resources. Combined, this information allows tetrisched to provide higher overall value to complex application mixes consolidated on heterogeneous collections of machines. Job-specific preferences, provided by tenants in the form of composable...

    Provided By Carnegie Mellon University

  • Webcasts // Nov 2013

    Panel Discussion: Managing the Insider Threat: What Every Organization Should Know

    In this webcast, the presenter going to discuss about managing the insider threat and how to ensure the protection of and appropriate access to intellectual property and other critical assets, systems, and data.

    Provided By Carnegie Mellon University

  • Webcasts // Nov 2013

    Illicit Cyber Activity Involving Fraud

    In this webcast, the presenter going to explain about illicit cyber activity involving fraud from the virtual event managing the insider threat. the presenters aim is to assist organizations in improving their security posture and incident response capability by researching technical threat areas, developing and conducting information security assessments, and...

    Provided By Carnegie Mellon University

  • Webcasts // Nov 2013

    Engineering Realistic Synthetic Insider Threat (Cyber-Social) Test Data

    Access to data remains a significant impediment to advancing the science of insider threat research. In this webcast, the presenter going to explain about engineering realistic synthetic about the insider threat test data from the virtual event who manages the insider threat.

    Provided By Carnegie Mellon University

  • Webcasts // Nov 2013

    Emerging Trends

    An emerging trend to pay attention to is the malicious outsider taking advantage of an inadvertent insider. In this webcast, the presenter going to explain about emerging trends in insider threat research from the virtual event managing the insider threat.

    Provided By Carnegie Mellon University

  • Webcasts // Nov 2013

    Best Practices and Controls for Mitigating Insider Threats

    Threats can stem from simple activities like uploading, emailing, and posting sensitive data, etc. In this webcast, the presenter will explain about best practices and controls for mitigating insider threats from the virtual event of how to manage the insider threat.

    Provided By Carnegie Mellon University

  • White Papers // Nov 2013

    More Effective Distributed ML via a Stale Synchronous Parallel Parameter Server

    The authors propose a parameter server system for distributed ML, which follows a Stale Synchronous Parallel (SSP) model of computation that maximizes the time computational workers spend doing useful work on ML algorithms, while still providing correctness guarantees. The parameter server provides an easy-to-use shared interface for read/write access to...

    Provided By Carnegie Mellon University

  • Podcasts // Nov 2013

    Overview of the Threat Posed by Insiders to Critical Assets

    Insiders pose a substantial threat by virtue of their knowledge of and access to the users systems and/or their databases. In this webcast, the presenter will give an overview of the threat posed by insiders to critical assets.

    Provided By Carnegie Mellon University

  • White Papers // Nov 2013

    Energy-Governed Resilient Networked Systems

    Connected embedded systems in the realm of smart infrastructures comprise ubiquitous end-point devices supported by a communication infrastructure. Device, energy supply and network failures are a reality and provisioned communications could fail. Self-organization is a process where network devices cooperate with each other to restore network connectivity on detecting network...

    Provided By Carnegie Mellon University

  • White Papers // Oct 2013

    GOTCHA Password Hackers!

    The authors introduce GOTCHAs (Generating panOptic Turing tests to tell Computers and Humans Apart) as a way of preventing automated offline dictionary attacks against user selected passwords. A GOTCHA is a randomized puzzle generation protocol, which involves interaction between a computer and a human. Informally, a GOTCHA should satisfy two...

    Provided By Carnegie Mellon University

  • White Papers // Oct 2013

    Challenges in Security and Privacy for Mobile Edge-Clouds

    Mobile devices such as Smartphone and tablets are ubiquitous today, and many of them possess significant computation power, powerful sensors such as high-resolution cameras and GPS sensors, and a wealth of sensor data such as photos, videos, and location information. Collections of mobile devices in close geographical proximity present both...

    Provided By Carnegie Mellon University

  • White Papers // Sep 2013

    Designing for Self-Configuration and Self-Adaptation in the Internet of Things

    The Internet of Things (IoT) paradigm comprises a heterogenous mix of connected devices connected to the Internet. This promises a wealth of opportunity for a large collection of distributed applications and services. However, the IoT introduces significant changes to the Internet model, largely in the form of billions to trillions...

    Provided By Carnegie Mellon University

  • White Papers // Sep 2013

    LightTx: A Lightweight Transactional Design in Flash-based SSDs to Support Flexible Transactions

    Flash memory has accelerated the architectural evolution of storage systems with its unique characteristics compared to magnetic disks. The no-overwrite property of flash memory has been leveraged to efficiently support transactions, a commonly used mechanism in systems to provide consistency. However, existing transaction designs embedded in flash-based Solid State Drives...

    Provided By Carnegie Mellon University

  • White Papers // Sep 2013

    Program Interference in MLC NAND Flash Memory: Characterization, Modeling, and Mitigation

    As NAND flash memory continues to scale down to smaller process technology nodes, its reliability and endurance are degrading. One important source of reduced reliability is the phenomenon of program interference: when a flash cell is programmed to a value, the programming operation affects the threshold voltage of not only...

    Provided By Carnegie Mellon University

  • White Papers // Sep 2013

    HAT: Heterogeneous Adaptive Throttling for On-Chip Networks

    The Network-on-Chip (NoC) is a primary shared resource in a Chip Multi-Processor (CMP) system. As core counts continue to increase and applications become increasingly data-intensive, the network load will also increase, leading to more congestion in the network. This network congestion can degrade system performance if the network load is...

    Provided By Carnegie Mellon University

  • White Papers // Sep 2013

    Secure Two-Party Computation with Reusable Bit-Commitments, via A Cut-and-Choose with Forge-and-Lose Technique

    A Secure Two-Party Computation (S2PC) protocol allows two parties to compute over their combined private inputs, as if inter-mediated by a trusted third party. In the active model, security is maintained even if one party is malicious, deviating from the protocol specification. For example, an honest party retains privacy of...

    Provided By Carnegie Mellon University

  • White Papers // Aug 2013

    Design of a Write-Optimized Data Store

    The WriteBuffer (WB) tree is a new write-optimized data structure that can be used to implement per-node storage in unordered key-value stores. The WB tree provides faster writes than the Log-Structured Merge (LSM) tree that is used in many current high-performance key-value stores. It achieves this by replacing compactions in...

    Provided By Carnegie Mellon University

  • Webcasts // Aug 2013

    Observations of Successful Cyber Security Operations

    In this Webcast, the presenter going explain about the cyber security The presenter will also discuss the observations of successful cyber security operations from the virtual event showing the users a big picture about the organization how they successfully react to new specific accessories build on the cyber security.

    Provided By Carnegie Mellon University

  • Webcasts // Aug 2013

    Responding to a Large Scale Cybersecurity Incident

    In this Webcast, the presenter explain about how to respond to a large scale cyber security incidents, with an introduction about the role of technology. Technology which is an important one, but the limitations of that need to be understood.

    Provided By Carnegie Mellon University

  • Webcasts // Aug 2013

    20+ Years of Cyber (in)Security

    The use of information and communications technology is pervasive. The information systems are increasingly interconnected and interdependent. Attack technology is outpacing defensive technology. In this webcast, the presenter will give an introduction to the cyber security.

    Provided By Carnegie Mellon University

  • Webcasts // Aug 2013

    Achieving Mission Assurance Through Resilience Management

    In this webcast, the presenter going to explain about the resilience management. Resilience management is to protect a sustain organizations mission and business operations. The presenter will also explain about how the organizations are constant operational stress on these days.

    Provided By Carnegie Mellon University

  • Webcasts // Aug 2013

    Developing Your Cyber Workforce

    In this webcast, the presenter going to explain about the how to develop the cyber workforce against the security attacks. The presenter going to discuss about the new solutions and research that he had done to improve the security.

    Provided By Carnegie Mellon University

  • Webcasts // Aug 2013

    The Cyber Security R&D Pipeline - Building Capability Through Science

    In this webcast, the presenter going to explain about the cyber security R&D pipeline how to build the capability through science. The presenter explains about the SEI advances software engineering and related disciplines to ensure systems with predictable and improved quality, cost and schedule.

    Provided By Carnegie Mellon University

  • White Papers // May 2000

    Real Time Automated Transcription of Live Music Into Sheet Music using Common Music Notation

    This document reports on a project, whose objective is to implement a system on the C67 EVM board that will accept live music through a microphone, detect the notes, and transcribe them into sheet music in real time. Past projects have only attempted the transcription of recorded music, while this...

    Provided By Carnegie Mellon University

  • White Papers // May 2004

    Determining Collusion in Negotiations

    This article provides a method for determining the legal outcomes of a labor contract negotiation through determining the limits of rational negotiation and irrational negotiation bounded by labor law. Given certain laws protecting union workers, leverage in detecting colluding strategies is available. Manipulation of labor negotiations remains a problem in...

    Provided By Carnegie Mellon University

  • Presentations // Jan 2003

    Pricing

    Pricing spells out the amount of money that would be charged in exchange for a particular product or service. An effective pricing strategy helps in building strong customer loyalty over time. Different types of pricing strategies are called into operation at different stages of the product life cycle. The paper...

    Provided By Carnegie Mellon University

  • Case Studies // Dec 2004

    Overview and Cryptanalysis of the DVD Contents Scrambling System and DeCSS

    This paper presents an overview of DVD's Contents Scrambling System. The purpose of this overview is to then construct an attack tree [14] of the attacks used, which could be used for developing a tool to test other proprietary (unknown) encryption algorithms. The CSS was put in place to prevent...

    Provided By Carnegie Mellon University

  • White Papers // May 2004

    ScamSlam: An Architecture for Learning the Criminal Relations Behind Scam Spam

    This white paper introduces Scam Slam, a software system designed to learn the underlying number criminal cells perpetrating a particular type of scam, as well as to identify which scam spam messages were written by which cell. The system consists of two main components; a filtering mechanism based on a...

    Provided By Carnegie Mellon University

  • White Papers // Jul 2004

    Sentiment Extraction From Unstructured Text Using Tabu Search-Enhanced Markov Blanket

    This white paper proposes a two-stage Bayesian algorithm that is able to capture the dependencies among words, and, at the same time, finds a vocabulary that is efficient for the purpose of extracting sentiments. It also reveals that experimental results on the Movie Reviews data set show that the algorithm...

    Provided By Carnegie Mellon University

  • White Papers // Jul 2001

    Understanding Popout: Pre-attentive Segmentation Through Non-Directional Repulsion

    This white paper document identifies two measures which are to mark conspicuous image locations such as region boundaries, smooth contours and pop out targets against backgrounds, with attraction and non-directional repulsion, and unifies the dual processes of association by attraction and segregation by repulsion in one grouping framework. The paper...

    Provided By Carnegie Mellon University

  • White Papers // Dec 2003

    Attribute-Based Prediction of File Properties

    This paper presents the evidence that attributes that are known to the file system when a file is created, such as its name, permission mode, and owner, are often strongly related to future properties of the file such as its ultimate size, lifespan, and access pattern. More importantly, it shows...

    Provided By Carnegie Mellon University

  • White Papers // Jun 2004

    Toward Automatic Context-Based Attribute Assignment for Semantic File Systems

    Semantic file systems enable users to search for files based on attributes rather than just pre-assigned names. This paper develops and evaluates several new approaches to automatically generating file attributes based on context, complementing existing approaches based on content analysis. Based on this study of ten systems over four months,...

    Provided By Carnegie Mellon University

  • White Papers // Aug 2009

    High Dimensional Consensus in Large-Scale Networks: Theory and Applications

    In this paper, the authors develop the theory of High Dimensional Consensus (HDC), a general class of distributed algorithms in large-scale networks. HDC relies only on local information, local communication, and low-order computation, and, hence, is ideally suited to implement network tasks under resource constraints, e.g., in sparse networks with...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2011

    A Statistical Approach to Contention Modeling for High-Level Heterogeneous Multiprocessor Simulation

    Single chip systems featuring multiple heterogeneous processors and a variety of communication and memory architectures have emerged to satisfy the demand for networking, handheld computing, and other custom devices. The complex interactions between applications, schedulers, and processor resources, along with the resulting contention delays for shared busses and memories, are...

    Provided By Carnegie Mellon University

  • White Papers // Aug 2009

    Predicting Memory Activity Using Spatial Correlation

    The memory wall continues to pose a performance bottleneck for computer systems - studies show that modern servers spend up to two-thirds of execution time stalled on memory accesses. Although recent trends forecast growth in processor clock frequencies to be minimal, improvements to memory access latencies are correspondingly slow. Traditional...

    Provided By Carnegie Mellon University

  • White Papers // Jul 2010

    Constraining Credential Usage in Logic-Based Access Control

    Authorization logics allow concise specification of flexible access-control policies, and are the basis for logic-based access-control systems. In such systems, resource owners issue credentials to specify policies, and the consequences of these policies are derived using logical inference rules. Proofs in authorization logics can serve as capabilities for gaining access...

    Provided By Carnegie Mellon University

  • White Papers // Jul 2009

    Efficient Proving for Practical Distributed Access-Control Systems

    The authors present a new technique for generating a formal proof that an access request satisfies access-control policy, for use in logic-based access-control frameworks. The approach is tailored to settings where credentials needed to complete a proof might need to be obtained from, or reactively created by, distant components in...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2011

    Improving Web Availability for Clients With MONET

    Despite the increasing degree of multi-homing, path and data redundancy, and capacity available in the Internet, today's clients experience outage rates of a few percent when accessing Web sites. MONET ("Multi-homed Overlay NETwork), is a new system that improves client availability to Web sites using a combination of link multi-homing...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2011

    Athena: A New Efficient Automatic Checker for Security Protocol Analysis

    The authors propose an efficient automatic checking algorithm, Athena, for analyzing security protocols. Athena incorporates a logic that can express security properties including authentication, secrecy and properties related to electronic commerce. They have developed an automatic procedure for evaluating well-formed formulae in this logic. For a well-formed formula, if the...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2011

    Athena: A Novel Approach to Efficient Automatic Security Protocol Analysis

    The authors propose a new efficient automatic verification technique, Athena, for security protocol analysis. It uses a new efficient representation - the extension to the Strand Space Model, and utilizes techniques from both model checking and theorem proving approaches. Athena is fully automatic and is able to prove the correctness...

    Provided By Carnegie Mellon University

  • White Papers // Oct 2009

    A Random Dynamical Systems Approach to Filtering in Large-Scale Networks

    Networked Control Systems (NCS) have been proposed as the paradigm to model, design and analyze control systems where the effects of computation and communication on the performance of the closed loop system cannot be neglected and need to be incorporated in the model. NCS are amenable to describe large-scale systems...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2011

    New Streaming Algorithms for Fast Detection of Super spreaders

    High-speed monitoring of Internet traffic is an important and challenging problem, with applications to real time attack detection and mitigation, traffic engineering, etc. However, packet-level monitoring requires fast streaming algorithms that use very little memory and little communication among collaborating network monitoring points. In this paper, the authors consider the...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2011

    Random Key Predistribution Schemes for Sensor Networks

    Wide-spread deployment of sensor networks is on the horizon. Networks of thousands of sensors may present an economical solution to some of the challenging problems: real-time traffic monitoring, building safety monitoring (structural, fire, and physical security monitoring), military sensing and tracking, distributed measurement of seismic activity, real-time pollution monitoring, wildlife...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2011

    Vulnerability-Specific Execution Filtering for Exploit Prevention on Commodity Software

    Software vulnerabilities have had a devastating effect on the Internet. Worms such as Code Red and Slammer can compromise hundreds of thousands of hosts within hours or even minutes, and cause millions of dollars of damage. To successfully combat these fast automatic Internet attacks, one needs fast automatic attack detection...

    Provided By Carnegie Mellon University

  • White Papers // Oct 2009

    A Narrow Waist for Multipath Routing

    Many applications can use multipath routing to improve reliability or throughput, and many multipath routing protocols exist. Despite this diversity of mechanisms and applications, no common interface exists to allow an application to select these paths. This paper presents a design for such a common interface, called path bits. Path...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2011

    Here Are My Data Files. Here Are My Queries. Where Are My Results?

    DataBase Management Systems (DBMS) provide incredible flexibility and performance when it comes to query processing, scalability and accuracy. To fully exploit DBMS features, however, the user must define a schema, load the data, tune the system for the expected workload, and answer several questions. Should the database use a column-store,...

    Provided By Carnegie Mellon University

  • Webcasts // May 2011

    Introduction to the SOA Architect Professional Certificate With Grace Lewis

    In this video the presenter discusses why the SEI is offering the SOA certificate and the importance of knowing how the service-oriented architectural style affects a system's quality attributes (e.g., security, performance, and modifiability). She talks about her primary goals in teaching the SOA courses, the three main takeaways SOA...

    Provided By Carnegie Mellon University

  • Webcasts // May 2011

    Introduction to the SOA Architect Professional Certificate With Dennis Smith

    In this video, the presenter, SOA course instructor and lead of the SEI System-of-Systems Performance team, discusses why the SEI is offering the SOA certificate and why basic architecture principles and practices are even more important to effective SOA adoption than to single system development. He also explains his primary...

    Provided By Carnegie Mellon University

  • Webcasts // Nov 2009

    Talking Architects With Len Bass

    In this webcast, the presenter talks with Len Bass, co-author of Software Architecture in Practice, about how quality attributes (non-functional requirements) could be considered as "First class citizens" of a project in an agile development environment (20 minutes, 15 seconds).

    Provided By Carnegie Mellon University

  • White Papers // Sep 2010

    Asset Pricing Puzzles Explained By Incomplete Brownian Equilibria

    The authors examine a class of Brownian based models which produce tractable incomplete equilibria. The models are based on finitely many investors with heterogeneous exponential utilities over intermediate consumption who receives partially unspanned income. The investors can trade continuously on a finite time interval in a money market account as...

    Provided By Carnegie Mellon University

  • White Papers // Oct 2010

    Sequential Monte Carlo Pricing Of American-Style Options Under Stochastic Volatility Models

    The authors introduce a new method to price American-style options on underlying investments governed by Stochastic Volatility (SV) models. The method does not require the volatility process to be observed. Instead, it exploits the fact that the optimal decision functions in the corresponding dynamic programming problem can be expressed as...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2011

    Size-Based Scheduling to Improve Web Performance

    Is it possible to reduce the expected response time of every request at a web server, simply by changing the order in which people schedule the requests? That is the question the authors ask in this paper. This paper proposes a method for improving the performance of web servers servicing...

    Provided By Carnegie Mellon University

  • White Papers // Jan 2011

    Evaluation of Task Assignment Policies for Supercomputing Servers: The Case for Load Unbalancing and Fairness

    While the MPP is still the most common architecture in supercomputer centers today, a simpler and cheaper machine configuration is growing increasingly common. This alternative setup may be described simply as a collection of multiprocessors or a distributed server system. This collection of multiprocessors is fed by a single common...

    Provided By Carnegie Mellon University

  • White Papers // Aug 2009

    A Supervised Factorial Acoustic Model for Simultaneous Multiparticipant Vocal Activity Detection in Close-Talk Microphone Recordings of Meetings

    The authors have implemented a supervised acoustic model for VAD in conversations with an arbitrary number of participants, and analyzed its performance with respect to the unsupervised AM baseline. Analysis consisted of a broad exploration of several parameters, two of which (inclusion of NLED features and decoding constraints on the...

    Provided By Carnegie Mellon University

  • White Papers // Aug 2009

    Modeling Content From Human-Verified Blacklists for Accurate Zero-Hour Phish Detection

    Phishing attacks are a significant security threat to users of the Internet, causing tremendous economic loss every year. Past work in academia has not been adopted by industry in part due to concerns about liability over false positives. However, blacklist-based methods heavily used in industry are slow in responding to...

    Provided By Carnegie Mellon University

  • White Papers // Apr 2011

    Local Isomorphism to Solve the Pre-Image Problem in Kernel Methods

    Kernel methods have been popular over the last decade to solve many computer vision, statistics and machine learning problems. An important, both theoretically and practically, open problem in kernel methods is the pre-image problem. The pre-image problem consists of finding a vector in the input space whose mapping is known...

    Provided By Carnegie Mellon University

  • White Papers // Jun 2011

    Lucy in the Sky Without Diamonds: Stealing Confidential Data in the Cloud

    Cloud computing is a recent paradigm that is creating high expectations about benefits such as the pay-per-use model and elasticity of resources. However, with this optimism come also concerns about security. In a public cloud, the user's data storage and processing is no longer done inside its premises, but in...

    Provided By Carnegie Mellon University

  • White Papers // Aug 2010

    Challenges in Anticipatory Information Management Under Network Constraints

    As various militaries move towards a vision of network centric warfare and network centric operations, multiple issues regarding information acquisition and presentation arise as one tries to use the full potential of a networked environment while overcoming the limitations imposed by the realities faced by the warfighter. In such an...

    Provided By Carnegie Mellon University

  • White Papers // Aug 2010

    The Cognitive Virtues of Dynamic Networks

    For the most part, studies in the network science literature tend to focus on networks whose functional connectivity is largely invariant with respect to some episode of collective information processing. In the real world, however, networks with highly dynamic functional topologies tend to be the norm. In order to improve...

    Provided By Carnegie Mellon University

  • White Papers // Jun 2011

    TFP During A Credit Crunch

    The financial crisis of 2008 was followed by sharp contractions in aggregate output and employment and an unusual increase in aggregate Total Factor Productivity (TFP). This paper attempts to explain these facts by modeling the creation and destruction of jobs in the presence of heterogeneity in firm productivity and frictional...

    Provided By Carnegie Mellon University

  • White Papers // Jul 2009

    The Coremelt Attack

    Over the past two decades, the Internet has become of critical importance for social, business, and government activities. Corporations depend on Internet availability to facilitate sales and the transfer of data to make timely decisions. SCADA networks often use the Internet to enable coordination between physical systems. Unfortunately, malicious parties...

    Provided By Carnegie Mellon University

  • White Papers // Jun 2009

    PCAL: Language Support for Proof-Carrying Authorization Systems

    By shifting the burden of proofs to the user, a Proof-Carrying Authorization (PCA) system can automatically enforce complex access control policies. Unfortunately, managing those proofs can be a daunting task for the user. In this paper, the authors develop a Bash-like language, PCAL that can automate correct and efficient use...

    Provided By Carnegie Mellon University

  • White Papers // May 2009

    In Search of an API for Scalable File Systems: Under the Table or Above It?

    Big Data is everywhere - both the IT industry and the scientific computing community are routinely handling terabytes to petabytes of data. This preponderance of data has fueled the development of Data-Intensive Scalable Computing (DISC) systems that manage, process and store massive data-sets in a distributed manner. For example, Google...

    Provided By Carnegie Mellon University