Columbia University

Displaying 1-40 of 315 results

  • White Papers // Dec 2014

    Movers and Shakers: Kinetic Energy Harvesting for the Internet of Things

    Numerous energy harvesting wireless devices that will serve as building blocks for the Internet of Things (IoT) are currently under development. However, there is still only limited understanding of the properties of various energy sources and their impact on energy harvesting adaptive algorithms. Hence, the authors focus on characterizing the...

    Provided By Columbia University

  • White Papers // Nov 2014

    Malicious-Client Security in Blind Seer: A Scalable Private DBMS

    "The Blind Seer system (Oakland 2014) is an efficient and scalable DBMS that affords both client query privacy and server data protection. It also provides the ability to enforce authorization policies on the system, restricting client's queries while maintaining the privacy of both query and policy. Blind Seer supports a...

    Provided By Columbia University

  • White Papers // Sep 2014

    Pebbles: Fine-Grained Data Management Abstractions for Modern Operating Systems

    Support for fine-grained data management has all but disappeared from modern operating systems such as Android and iOS. Instead, the people must rely on each individual application to manage their data properly - e.g., to delete their emails, documents, and photos in full upon request; to not collect more data...

    Provided By Columbia University

  • White Papers // Jun 2014

    ParaShares: Finding the Important Basic Blocks in Multithreaded Programs

    Understanding and optimizing multithreaded execution is a significant challenge. Numerous research and industrial tools debug parallel performance by combing through program source or thread traces for pathologies including communication overheads, data dependencies, and load imbalances. This paper takes a new approach: it ignores any underlying pathologies, and focuses instead on...

    Provided By Columbia University

  • White Papers // May 2014

    GASPP: A GPU-Accelerated Stateful Packet Processing Framework

    Graphics Processing Units (GPUs) are a powerful platform for building high-speed network traffic processing applications using low-cost hardware. Existing systems tap the massively parallel architecture of GPUs to speed up certain computationally intensive tasks, such as cryptographic operations and pattern matching. However, they still suffer from significant overheads due to...

    Provided By Columbia University

  • White Papers // Apr 2014

    Benchmarking Methodology for Embedded Scalable Platforms

    Embedded Scalable Platforms (ESP) are a novel generation of platform architectures that yield optimal energy-performance operations while supporting a diversity of embedded application workloads. A companion methodology combines full-system simulation, pre-designed HW/SW interface libraries, high-level synthesis and FPGA prototyping to enable an effective design-space exploration which is driven by the...

    Provided By Columbia University

  • White Papers // Apr 2014

    Real-Time Power Control for Dynamic Optical Networks - Algorithms and Experimentation

    Core and aggregation optical networks are remarkably static, despite the emerging dynamic capabilities of the individual optical devices. This stems from the inability to address optical impairments in real-time. As a result, tasks such as adding and removing wavelengths take a substantial amount of time, and therefore, optical networks are...

    Provided By Columbia University

  • White Papers // Mar 2014

    Trading Functionality for Power within Applications

    When operating systems and hardware manage power and energy, they must be conservative in order to deliver requested resources while maintaining an expected rate of system throughput. Application-level energy management is more flexible, because applications can choose to request fewer resources or expect less performance, effectively trading accuracy or runtime...

    Provided By Columbia University

  • White Papers // Mar 2014

    Unsupervised Anomaly-based Malware Detection using Hardware Features

    Recent works have shown promise in using micro-architectural execution patterns to detect malware programs. These detectors belong to a class of detectors known as signature based detectors as they catch malware by comparing a program's execution pattern (signature) to execution patterns of known malware programs. In this paper, the authors...

    Provided By Columbia University

  • White Papers // Jan 2014

    Efficient Hash Probes on Modern Processors

    Bucketized versions of cuckoo hashing can achieve 95-99% occupancy, without any space overhead for pointers or other structures. However, such methods typically need to consult multiple hash buckets per probe, and have therefore been seen as having worse probe performance than conventional techniques for large tables. The authors consider workloads...

    Provided By Columbia University

  • White Papers // Jan 2014

    Tracking Quantiles of Network Data Streams with Dynamic Operations

    Quantiles are very useful in characterizing the data distribution of an evolving dataset in the process of data mining or network monitoring. The method of Stochastic Approximation (SA) tracks quantiles online by incrementally deriving and updating local approximations of the underly distribution function at the quantiles of interest. In this...

    Provided By Columbia University

  • White Papers // Jan 2014

    Throughput Optimization of Wireless Mesh Networks with MIMO Links

    Multiple Input Multiple Output (MIMO) antennas use sophisticated physical layer techniques to provide significant benefits over conventional antenna technology. Multiple independent data streams can be sent over the MIMO antenna elements. MIMO link can also suppress interference from neighboring links as long as the total useful streams and interfering streams...

    Provided By Columbia University

  • White Papers // Jan 2014

    Adding a Flow-Oriented Paradigm to Commodity Operating Systems

    The speed of CPUs and memories has historically outstripped I/O, but emerging network and storage technologies promise to invert this relationship. As a result, fundamental assumptions about the role of the operating system in computing systems will have to change. The authors propose an operating and application architecture that removes...

    Provided By Columbia University

  • White Papers // Dec 2013

    On the Effectiveness of Traffic Analysis Against Anonymity Networks Using Flow Records

    The authors investigate the feasibility of mounting a de-anonymization attack against Tor and similar low-latency anonymous communication systems by using NetFlow records. Previous research has shown that adversaries with the ability to eavesdrop in real time at a few internet exchange points can effectively monitor a significant part of the...

    Provided By Columbia University

  • White Papers // Oct 2013

    A Profitable Sub-Prime Loan: Obtaining the Advantages of Composite Order in Prime-Order Bilinear Groups

    Composite-order bilinear groups provide many structural features that have proved useful for both constructing cryptographic primitives and as a technique in security reductions. Despite these convenient features, however, composite-order bilinear groups are less desirable than prime-order bilinear groups for reasons of efficiency. A recent line of paper has therefore focused...

    Provided By Columbia University

  • White Papers // Sep 2013

    Privacy Policy-Driven Mashups

    Mashups are novel content created by extracting and combining data and services from diverse data sources, in an automated manner, using Web services. The Web 2.0 technologies make it easier for individuals to create contents in third party service sites or clouds, and make easier for other third party mashup...

    Provided By Columbia University

  • White Papers // Aug 2013

    CellFlood: Attacking Tor Onion Routers on the Cheap

    In this paper, the authors introduce a new denial-of-service attack against tor onion routers and they study its feasibility and implications. In particular, they exploit a design flaw in the way Tor software builds virtual circuits and demonstrate that an attacker needs only a fraction of the resources required by...

    Provided By Columbia University

  • White Papers // Jul 2013

    Server-Side Code Injection Attacks: A Historical Perspective

    Server-side code injection attacks used to be one of the main culprits for the spread of malware. A vast amount of research has been devoted to the problem of effectively detecting and analyzing these attacks. Common belief seems to be that these attacks are now a marginal threat compared to...

    Provided By Columbia University

  • White Papers // Jun 2013

    Order-Preserving Encryption Secure Beyond One-Wayness

    Semantic-security of individual bits under a ciphertext is fundamental notion in modern cryptography. In this paper, the authors present the first results about this fundamental problem for Order-Preserving Encryption (OPE): \"What plaintext information can be semantically hidden by OPE encryptions?\" While OPE has gained much attention in recent years due...

    Provided By Columbia University

  • White Papers // Jun 2013

    On Finite Block-Length Quantization Distortion

    The authors investigate the upper and lower bounds on the quantization distortions for independent and identically distributed sources in the finite block-length regime. Based on the convex optimization framework of the rate-distortion theory, they derive a lower bound on the quantization distortion under finite block-length, which is shown to be...

    Provided By Columbia University

  • White Papers // Jun 2013

    CloudFence: Data Flow Tracking as a Cloud Service

    The risk of unauthorized private data access is among the primary concerns for users of cloud-based services. For the common setting in which the infrastructure provider and the service provider are different, users have to trust their data to both parties, although they interact solely with the latter. In this...

    Provided By Columbia University

  • White Papers // May 2013

    Computational Decoys for Cloud Security

    Cloud-based applications benefit from the scalability and efficiency offered by server consolidation and shared facilities. However, the shared nature of cloud infrastructures may introduce threats stemming from the co-location and combination of untrusted components, in addition to typical risks due to the inevitable presence of weaknesses in the infrastructure itself....

    Provided By Columbia University

  • White Papers // Apr 2013

    You Can Type, But You Can't Hide: A Stealthy GPU-Based Keylogger

    Keyloggers are a prominent class of malware that harvests sensitive data by recording any typed in information. Keylogger implementations strive to hide their presence using rootkit-like techniques to evade detection by antivirus and other system protections. In this paper, the authors present a new approach for implementing a stealthy keylogger:...

    Provided By Columbia University

  • White Papers // Mar 2013

    Cloudopsy: an Autopsy of Data Flows in the Cloud

    Despite the apparent advantages of cloud computing, the fear of unauthorized exposure of sensitive user data and non-compliance to privacy restrictions impedes its adoption for security-sensitive tasks. For the common setting in which the cloud infrastructure provider and the online service provider are different, end users have to trust the...

    Provided By Columbia University

  • White Papers // Mar 2013

    WiMAX in the Classroom: Designing a Cellular Networking Hands-on Lab

    Wireless networking has recently gained tremendous attention in research and education. Since the concepts taught in wireless courses are difficult to acquire only through lectures, hands-on lab experience is indispensable. While Wi-Fi based networking labs have been introduced before, to the best of the authors' knowledge, labs that use a...

    Provided By Columbia University

  • White Papers // Jan 2013

    VBoom: Creating A Virtual Machine Real Estate Boom

    Cloud providers sell identically configured Virtual Machines (VMs) for the same price. Customers purchasing these VMs expect that they perform similarly and are allocated the same amount of virtual resources. In practice, however, the real performance of identically provisioned VMs depends on the underlying hardware, i.e., how the hardware is...

    Provided By Columbia University

  • White Papers // Dec 2012

    Sequential Aggregate Signatures with Short Public Keys: Design, Analysis and Implementation Studies

    The notion of aggregate signature has been motivated by applications and it enables any user to compress different signatures signed by different signers on different messages into a short signature. Sequential aggregate signature, in turn, is a special kind of aggregate signature that only allows a signer to add his...

    Provided By Columbia University

  • White Papers // Dec 2012

    Bait and Snitch: Defending Computer Systems with Decoys

    Threats against computer networks continue to multiply, but existing security solutions are persistently unable to keep pace with these challenges. In this paper the authors present a new paradigm for securing computational resources which they call decoy technology. This technique involves seeding a system with data that appears authentic but...

    Provided By Columbia University

  • White Papers // Nov 2012

    Cross-Layer Enabled Translucent Optical Network With Real-Time Impairment Awareness

    The existing dimensioning strategy for translucent, sub-wavelength switching architectures relies on over-provisioning, and consequently, overuse of costly, power-consuming Optical-Electrical-Optical (O/E/O) regenerators. In addition, due to a variety of external phenomena, many physical layer impairments are time-varying, and hence, can strongly degrade network performance. In this paper, the authors introduce a...

    Provided By Columbia University

  • White Papers // Nov 2012

    Privacy Preserving Revocable Predicate Encryption Revisited

    Predicate Encryption (PE) that provides both the access control of ciphertexts and the privacy of ciphertexts is a new paradigm of public-key encryption. An important application of predicate encryption is a searchable encryption system in a cloud storage, where it enables a client to securely outsource its data to an...

    Provided By Columbia University

  • White Papers // Nov 2012

    Accelerator Memory Reuse in the Dark Silicon Era

    Accelerators integrated on-die with General-Purpose CPUs (GP-CPUs) can yield significant performance and power improvements. Their extensive use, however, is ultimately limited by their area overhead; due to their high degree of specialization, the opportunity cost of investing die real estate on accelerators can become prohibitive, especially for general-purpose architectures. In...

    Provided By Columbia University

  • White Papers // Nov 2012

    Extensible Monitoring with Nagios and Messaging Middleware

    Monitoring is a core function of systems administration, and is primarily a problem of communication - a good monitoring tool communicates with users about problems, and communicates with hosts and software to take remedial action. The better it communicates, the greater the confidence administrators will have in its view of...

    Provided By Columbia University

  • White Papers // Oct 2012

    Aggregating CL-Signatures Revisited: Extended Functionality and Better Efficiency

    Aggregate signature is public-key signature that allows anyone to aggregate different signatures generated by different signers on different messages into a short (called aggregate) signature. The notion has many applications where compressing the signature space is important: in infrastructure: secure routing protocols, in security: compressed certificate chain signature, in signing...

    Provided By Columbia University

  • White Papers // Sep 2012

    CleanOS: Limiting Mobile Data Exposure with Idle Eviction

    Mobile-device theft and loss have reached gigantic proportions. Despite these threats, today's mobile devices are saturated with sensitive information due to operating systems that never securely erase data and applications that hoard it on the vulnerable device for performance or convenience. This paper presents CleanOS, a new Android-based operating system...

    Provided By Columbia University

  • White Papers // Aug 2012

    TimeWarp: Rethinking Timekeeping and Performance Monitoring Mechanisms to Mitigate Side-Channel Attacks

    Over the past two decades, several microarchitectural side channels have been exploited to create sophisticated security attacks. Solutions to this problem have mainly focused on fixing the source of leaks either by limiting the flow of information through the side channel by modifying hardware, or by refactoring vulnerable software to...

    Provided By Columbia University

  • White Papers // Aug 2012

    kGuard: Lightweight Kernel Protection Against Return-to-user Attacks

    Return-to-user (ret2usr) attacks exploit the operating system kernel, enabling local users to hijack privileged execution paths and execute arbitrary code with elevated privileges. Current defenses have proven to be inadequate, as they have been repeatedly circumvented, incur considerable overhead, or rely on extended hypervisors and special hardware features. The authors...

    Provided By Columbia University

  • White Papers // Aug 2012

    Scalable Group Signatures with Revocation

    Group signatures are a central cryptographic primitive, simultaneously supporting accountability and anonymity. They allow users to anonymously sign messages on behalf of a group they are members of. The recent years saw the appearance of several constructions with security proofs in the standard model (i.e., without appealing to the random...

    Provided By Columbia University

  • White Papers // Jul 2012

    Facebook and Privacy: It's Complicated

    The authors measure users' attitudes toward interpersonal privacy concerns on Facebook and measure users' strategies for reconciling their concerns with their desire to share content online. To do this, they recruited 260 Facebook users to install a Facebook application that surveyed their privacy concerns, their friend network compositions, the sensitivity...

    Provided By Columbia University

  • White Papers // Jun 2012

    Privacy-Preserving Social Plugins

    The widespread adoption of social plugins, such as Facebook's Like and Google's +1 buttons, has raised concerns about their implications to user privacy, as they enable social networking services to track a growing part of their members' browsing activity. Existing mitigations in the form of browser extensions can prevent social...

    Provided By Columbia University

  • White Papers // May 2012

    A Robust MDP Approach to Secure Power Control in Cognitive Radio Networks

    Power control plays a key role in realizing reliable and spectrum-efficient communications in a cognitive radio network. In this paper, the authors study secure power control schemes for cognitive radios via a robust Markov Decision Process (MDP) approach. They first use the Discrete Time Markov Chain (DTMC) model to characterize...

    Provided By Columbia University

  • White Papers // Sep 2010

    Baseline: Metrics for Setting a Baseline for Web Vulnerability Scanners

    As web scanners are becoming more popular because they are faster and cheaper than security consultants, the trend of relying on these scanners also brings a great hazard: users can choose a weak or outdated scanner and trust incomplete results. Therefore, benchmarks are created to both evaluate and compare the...

    Provided By Columbia University

  • White Papers // Oct 2010

    Towards Using Cached Data Mining for Large Scale Recommender Systems

    Recommender systems are becoming increasingly popular. As these systems become commonplace and the number of users increases, it will become important for these systems to be able to cope with a large and diverse set of users whose recommendation needs may be very different from each other. In particular, large...

    Provided By Columbia University

  • White Papers // Dec 2010

    Modeling User Search Behavior for Masquerade Detection

    Masquerade attacks are a common security problem that is a consequence of identity theft. Masquerade detection may serve as a means of building more secure and dependable systems that authenticate legitimate users by their behavior. Prior work has focused on user command modeling to identify abnormal behavior indicative of impersonation....

    Provided By Columbia University

  • White Papers // Dec 2010

    A Comprehensive Survey of Voice Over IP Security Research

    This paper presents a comprehensive survey of Voice over IP security academic research, using a set of 245 publications forming a closed cross-citation set. The authors classify these papers according to an extended version of the VoIP Security Alliance (VoIPSA) Threat Taxonomy. The goal is to provide a roadmap for...

    Provided By Columbia University

  • White Papers // Jan 2011

    Distributed Algorithms for Secure Multipath Routing in Attack-Resistant Networks

    To proactively defend against intruders from readily jeopardizing single-path data sessions, the authors propose a distributed secure multipath solution to route data across multiple paths so that intruders require much more resources to mount successful attacks. The work exhibits several important properties that includes routing decisions are made locally by...

    Provided By Columbia University

  • White Papers // Jan 2011

    Binary-Level Function Proling for Intrusion Detection and Smart Error Virtualization

    Most current approaches to Self-Healing Software (SHS) suffer from semantic incorrectness of the response mechanism. To support SHS, the authors propose Smart Error Virtualization (SEV), which treats functions as transactions but provides a way to guide the program state and remediation to be a more correct value than previous work....

    Provided By Columbia University

  • White Papers // Jan 2011

    Seamless Layer-2 Handoff Using Two Radios in IEEE 802.11 Wireless Networks

    A number of algorithms have been proposed to achieve seamless layer-2 handoff. However, none of them eliminated handoff delay completely although some of them improved handoff time significantly, albeit with change to the infrastructure or 802.11 standard. This paper proposes a handoff algorithm which achieves seamless layer-2 handoff using two...

    Provided By Columbia University

  • White Papers // Jan 2011

    Speculative Execution as an Operating System Service

    Software faults and vulnerabilities continue to present significant obstacles to achieving reliable and secure software. In an effort to overcome these obstacles, systems often incorporate self-monitoring and self-healing functionality. The hypothesis is that internal monitoring is not an effective long-term strategy. However, monitoring mechanisms that are completely external lose the...

    Provided By Columbia University

  • White Papers // Jan 2011

    Linear Approximation of Optimal Attempt Rate in Random Access Networks

    While packet capture has been observed in real implementations of wireless devices randomly accessing shared channels, fair rate control algorithms based on accurate channel models that describe the phenomenon have not been developed. In this paper, using a general physical channel model, the authors develop the equation for the optimal...

    Provided By Columbia University

  • White Papers // Jan 2011

    Throughput and Fairness in CSMA/CA Wireless Networks

    While physical layer capture has been observed in real implementations of wireless devices accessing the channel like 802.11, log-utility fair allocation algorithms based on accurate channel models describing the phenomenon have not been developed. In this paper, using a general physical channel model, the authors develop an allocation algorithm for...

    Provided By Columbia University

  • White Papers // Jan 2011

    Change-Centric Management of Versions in an XML Warehouse

    The authors present a change-centric method to manage versions in a Web WareHouse of XML data. The starting point is a sequence of snapshots of XML documents they obtain from the web. By running a diff algorithm, they compute the changes between two consecutive versions. They then represent the sequence...

    Provided By Columbia University

  • White Papers // Apr 2009

    Managing Homeless Shelters

    This is a formal analysis of how homeless shelters should operate: in particular, what quality of accommodations they should provide and how they should help their residents in securing conventional housing. The author also examines timing. The results extend to cover optimal police response to street homelessness as well. The...

    Provided By Columbia University

  • White Papers // Aug 2009

    Credit Spreads And Monetary Policy

    The authors consider the desirability of modifying a standard Taylor rule for a central bank's interest-rate policy to incorporate either an adjustment for changes in interest-rate spreads or a response to variations in the aggregate volume of credit. They consider the consequences of such adjustments for the way in which...

    Provided By Columbia University

  • White Papers // Aug 2009

    Resolving Conflicting Preferences In School Choice: The "Boston" Mechanism Reconsidered

    The Boston mechanism is among the most popular school choice procedures in use. Yet, the mechanism has been criticized for its poor incentive and welfare performances, which led the Boston Public Schools to recently replace it with Gale and Shapley's deferred acceptance algorithm (henceforth, DA). The DA elicits truthful revelation...

    Provided By Columbia University

  • White Papers // Sep 2004

    A Structural Demand Analysis for Wireless Services Under Nonlinear Pricing Schemes

    Service industries are a rapidly growing sector in the US economy and account for over 60% of its total output. Wireless communications in particular have become ubiquitous and there are an estimated 160 million subscribers in the US alone. In this paper, the authors' focus on the wireless communications industry...

    Provided By Columbia University

  • White Papers // Jun 2009

    Brave New World: Pervasive Insecurity of Embedded Network Devices

    Embedded network devices have become a ubiquitous fixture in the modern home, office as well as in the global communication infrastructure. Devices like routers, NAS appliances, home entertainment appliances, Wi-Fi access points, web cams; VoIP appliances, print servers and video conferencing units reside on the same networks as personal computers...

    Provided By Columbia University

  • White Papers // Jan 2009

    Collaborative Distributed Intrusion Detection

    The rapidly increasing array of Internet - scale threats is a pressing problem for every organization that utilizes the network. Organizations often have limited resources to detect, and respond to these threats. The sharing of information related to probes and attacks is a facet of an emerging trend toward collaborative...

    Provided By Columbia University

  • White Papers // Sep 2009

    Interaction With the Environment: Sensor Data Visualization in Outdoor Augmented Reality

    Proliferating sensor systems provide a rich source of data for understanding the dynamic characteristics of the environment. Visualization of, and interaction with, such data in outdoor augmented reality poses several challenges for infrastructure, representation, interactive data collection, and information discovery and filtering. The author discusses these challenges in the context...

    Provided By Columbia University

  • White Papers // Jul 2009

    Research Directions for Network Intrusion Recovery

    One of the most significant unsolved problems for network managers and system administrators is how to repair a network infrastructure after discovering evidence of an extensive compromise. The technical issues are compounded by a breathtaking variety of human factors. This paper highlight lessons learned from three real, significant, and recent...

    Provided By Columbia University

  • White Papers // Mar 2010

    Automated Data Cleaning Linking Data Manager to Study Coordinator: Error Finding by Variable and Error Fixing by Subject

    Many researchers using the SAS System software receive data sets with incomplete data or data errors. Data cleaning can become an extremely tedious task for the Coordinators who must return to medical records or Case Report Forms (CRFs) if the data managers list errors by variable. Instead it is easier...

    Provided By Columbia University

  • White Papers // Dec 2009

    Good Cause And Effect

    Creative models for buying and selling goods allow consumers to act philanthropically through charity tie-ins with product purchases. But are they profitable? This paper shows that linking a product with a charity donation is an effective way to boost sales - but not quite enough to make up for the...

    Provided By Columbia University

  • White Papers // Dec 2009

    Financial Models: Why All The Fuss?

    This article covers the discussion in the research symposium "The Quantitative Revolution and the Crisis: How Have Quantitative Financial Models Been Used and Misused" at Columbia Business School on December 4 explored the causes and effects of the proliferation of quantitative finance. Donald MacKenzie, a professor of sociology at the...

    Provided By Columbia University

  • White Papers // Nov 2009

    Opportunities In Alternative Energy

    In an event held at Columbia Business School, Warren Buffett and Bill Gates spoke on opportunities in alternative energy. Gates identified energy - including renewable sources, like solar - healthcare and IT as the three sectors he sees as having the most opportunity for transformative growth in the foreseeable future....

    Provided By Columbia University

  • White Papers // May 2009

    Creating Trust With Mobile Phones

    In developing countries, it makes up 41% of gross national income, 30% of the GDP, accounts for 70% of employment and in many countries is growing faster than the overall economy. This thriving area of growth is also known as the informal sector. The businesses that make up this sector...

    Provided By Columbia University

  • White Papers // Apr 2010

    More Women Needed In Venture Capital

    What are entrepreneurs doing, and what role can VCs play, to bring more women into the world of start-ups and venture capital? Is there a tipping point or critical mass? In companies where there are two senior female executives or board members, is there a higher percentage of females company-wide?...

    Provided By Columbia University

  • White Papers // Apr 2010

    Lab Work For Your Business Model

    Management professor Rita McGrath says experimentation must be an integral part of a company's strategy in order to remain competitive in the future. "The level of uncertainty and speed of change are touching sectors that used to be buffered from that," McGrath says. "When you don't know what's going to...

    Provided By Columbia University

  • White Papers // Nov 2009

    New Healthcare Paradigm: Technology, Value And Emergence

    As the vitriolic debate on healthcare reform dominates the news, healthcare industry leaders continue to focus on several issues: innovation to drive growth and promote cost efficiencies; new offerings to generate higher value for each healthcare dollar invested; and the emergence of attractive new global markets and technologies. They recognize...

    Provided By Columbia University

  • White Papers // Oct 2009

    Aligning Technology With Business Strategy

    "Injecting technology into a company without process and organizational change creates waste and chaos," George Colony, founder and CEO of Forrester Research, has famously said. It's true. Despite good intentions, software teams typically end up using a technology-centric approach to application development, with technology and project management metrics driving most...

    Provided By Columbia University

  • White Papers // Apr 2010

    Professor McGrath On Discovery-Driven Growth

    Rita G. McGrath, associate professor of management, recently spoke with BusinessWeek about the theories and concepts explored in her newest book, Discovery-Driven Growth: A Breakthrough Process to Reduce Risk and Seize Opportunity. BusinessWeek recently named the book, coauthored with Ian C. MacMillan, one of the best design and innovation books...

    Provided By Columbia University

  • White Papers // May 2010

    Apiary: Easy-to-Use Desktop Application Fault Containment on Commodity Operating Systems

    Desktop computers are often compromised by the interaction of unsecure data and buggy software. To address this problem, the authors present Apiary, a system that transparently contains application faults while retaining the usage metaphors of a traditional desktop environment. Apiary accomplishes this with three key mechanisms. It isolates applications in...

    Provided By Columbia University

  • White Papers // Jan 2010

    Web-Collaborative Filtering: Recommending Music by Spidering The Web

    Authors show that it is possible to collect data that is useful for collaborative filtering (CF) using an autonomous Web spider. In CF, entities are recommended to a new user based on the stated preferences of other, similar users. They describe a CF spider that collects from the Web lists...

    Provided By Columbia University

  • White Papers // Feb 2010

    National Cyber Defense Financial Services Workshop Report

    Large portions of the country's economic, industrial, social, and governmental functions now depend on a cyber infrastructure assembled from readily available commercial information system components. Much of this infrastructure is organized to tolerate random failures and outages, including targeted attacks against specific institutions, but could fail under concerted attack against...

    Provided By Columbia University

  • White Papers // Jan 2010

    WebSOS: Protecting Web Servers From DDoS Attacks

    This paper presents the WebSOS architecture, a mechanism for countering Denial of Service (DoS) attacks against web servers. WebSOS uses a combination of overlay networking, content-based routing, and aggressive packet filtering to guarantee access to a service that is targeted by a DoS attack. The approach requires no modifications to...

    Provided By Columbia University

  • White Papers // Nov 2009

    Handbook For Promoting Foreign Direct Investment In Medium-Size, Low-Budget Cities In Emerging Markets

    The growth of foreign direct investment (FDI) and the positive impact such investment can have on economic growth and development lead locations around the world to seek to attract inward investment to secure new capital, new jobs, new technologies, and new skills, and to improve their infrastructure, export capacity and...

    Provided By Columbia University

  • White Papers // May 2010

    Sequential Projection Learning for Hashing With Compact Codes

    Hashing based Approximate Nearest Neighbor (ANN) search has attracted much attention due to its fast query time and drastically reduced storage. However, most of the hashing methods either use random projections or extract principal directions from the data to derive hash functions. The resulting embedding suffers from poor discrimination when...

    Provided By Columbia University

  • White Papers // Jan 2010

    Requirements for Scalable Access Control and Security Management Architectures

    Maximizing local autonomy has led to a scalable Internet. Scalability and the capacity for distributed control have unfortunately not extended well to resource access control policies and mechanisms. Yet management of security is becoming an increasingly challenging problem, in no small part due to scaling up of measures such as...

    Provided By Columbia University

  • White Papers // Feb 2010

    Swift Fox Whitepaper

    For over a decade, wireless sensor networks (WSNs) fostered the development of new applications and trends in the broad areas of mobile and opportunistic computing. Such networks are composed of multiple small, low-cost and low-power, multipurpose sensor nodes that communicate with each other over small distances using the wireless medium...

    Provided By Columbia University

  • White Papers // Mar 2009

    A Market-Based Bandwidth Charging Framework

    The increasing demand for high-bandwidth applications such as video-on-demand and grid computing is reviving interest in bandwidth reservation schemes. Earlier attempts did not catch on for a number of reasons, notably lack of interest on the part of the bandwidth providers. This, in turn, was partially caused by the lack...

    Provided By Columbia University

  • White Papers // Jan 2010

    Characterizing Self-Healing Software Systems

    The introduction of self-healing capabilities to software systems could offer a way to alter the current, unfavorable imbalance in the software security arms race. Consequently, self-healing software systems have emerged as a research area of particular interest in recent years. Motivated by the inability of traditional techniques to guarantee software...

    Provided By Columbia University

  • White Papers // Aug 2009

    Preferences And Equilibrium In Monopoly And Duopoly

    This paper takes the new approach of using a copula to characterize consumer preferences in a discrete choice model of product differentiation, and applies it to the economics of monopoly and duopoly. The comparative statics of demand strength and preference diversity, both properties of the marginal distribution of values for...

    Provided By Columbia University