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Columbia University
(362 results)-
Whitepapers
Real-World SIP Interoperability: Still an Elusive Quest
November 27, 2007, 12:00am PST
With more than a decade of development led by the IETF, and a plethora of devices and software systems speaking its dialect, SIP together with its related standards has grown in size and scale,...
Provided by Columbia University
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Whitepapers
IPv6 Addresses as Content Names in Information-Centric Networking
May 13, 2011, 12:00am PDT
Content is quickly beginning to emerge as the core of Internet and networking applications today. Among the most important research issues with content is the problem of addressing and naming...
Provided by Columbia University
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Whitepapers
Dynamic Service Scalability in Information-Centric Networks
May 13, 2011, 12:00am PDT
Information- or Content-Centric Networks have gotten a lot of interest recently, particularly due to the promise to address problems inherent in today's host-based networking architecture. But...
Provided by Columbia University
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White Papers
The Financial Crisis And The Federal Reserve
October 1, 2009, 12:00am PDT
The tightening of credit standards and the failure of the cost of credit to households and businesses to fall during the current crisis, despite the sharp easing of monetary policy, has led to a...
Provided by Columbia University
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White Papers
On the Multi-Hop Performance of Synchronization Mechanisms in High Propagation Delay Networks
September 22, 2008, 12:00am PDT
The authors analyze the single and multi-hop performance of time synchronization mechanisms for challenging environments characterized by high propagation delays, low duty-cycle operation, and...
Provided by Columbia University
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White Papers
Buy-at-Bulk Network Design With Protection
August 7, 2007, 12:00am PDT
This paper considers approximation algorithms for buy-at-bulk network design, with the additional constraint that demand pairs be protected against edge or node failures in the network. In...
Provided by Columbia University
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White Papers
Commonality In Disagreement And Asset Pricing
March 25, 2008, 12:00am PDT
This paper presents a dynamic model to demonstrate that, when differences-of-opinion over individual securities have a common component, the valuation of the aggregate market can be higher than...
Provided by Columbia University
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White Papers
Is There A Trend In Idiosyncratic Volatility?
July 1, 2008, 12:00am PDT
The authors examine idiosyncratic volatility in 23 developed equity markets, measured using various alternative methodologies, and find no evidence that it is trending upward. Instead,...
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White Papers
Distributed Robust Optimization (DRO) Part II: Wireless Power Control
February 18, 2010, 12:00am PST
Optimization formulations and distributed algorithms have long been used for resource allocation problems in wireless networks including power control. However, the often assumed constant...
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White Papers
Goals And Plans In Decision Making
June 3, 2007, 12:00am PDT
This paper proposes a constructed-choice model for general decision making. The model departs from utility theory and prospect theory in its treatment of multiple goals and it suggests several...
Provided by Columbia University
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White Papers
Virtualization Mechanisms for Mobility, Security and System Administration
April 28, 2010, 12:00am PDT
This dissertation demonstrates that operating system virtualization is an effective method for solving many different types of computing problems. The authors have designed novel systems that make...
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White Papers
Secure "Selecticast" for Collaborative Intrusion Detection Systems
January 1, 2008, 12:00am PST
The problem domain of Collaborative Intrusion Detection Systems (CIDS) introduces distinctive data routing challenges, which the paper shows are solvable through a sufficiently flexible...
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White Papers
Toward Cost-Sensitive Modeling for Intrusion Detection and Response
January 1, 2008, 12:00am PST
Intrusion Detection Systems (IDSs) must maximize the realization of security goals while minimizing costs. This paper studies the problem of building cost-sensitive intrusion detection models. The...
Provided by Columbia University
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White Papers
Interference Management in Wireless Communication Systems: Theory and Applications
December 31, 2010, 12:00am PST
Interference is a fundamental nature of wireless communication systems, in which multiple transmissions often take place simultaneously over a common communication medium. In recent years, there...
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White Papers
Using Channel Hopping to Increase 802.11 Resilience to Jamming Attacks
January 1, 2011, 12:00am PST
802.11a, b, and g standards were designed for deployment in cooperative environments, and hence do not include mechanisms to protect from jamming attacks. In this paper, the authors explore how to...
Provided by Columbia University
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White Papers
Effects of Power Conservation, Wireless Coverage and Cooperation on Data Dissemination Among Mobile Devices
January 1, 2011, 12:00am PST
This paper presents 7DS, a novel peer-to-peer data sharing system. 7DS is architecture, a set of protocols and an implementation enabling the exchange of data among peers that are not necessarily...
Provided by Columbia University
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White Papers
Design and Implementation of a Peer-to-Peer Data Dissemination and Prefetching Tool for Mobile Users
January 1, 2011, 12:00am PST
This paper presents 7DS, a novel peer-to-peer data sharing system. Peers can be either mobile or stationary (such as infostations). 7DS is architecture, a set of protocols and an implementation...
Provided by Columbia University
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White Papers
A Performance Analysis of 7 DS : A Peer-to-Peer Data Dissemination and Prefetching Tool for Mobile Users
January 1, 2011, 12:00am PST
This paper presents 7DS, a novel peer-to-peer data sharing system. Peers can be either mobile or stationary 7DS is architecture, a set of protocols and an implementation enabling the exchange of...
Provided by Columbia University
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White Papers
Connectivity Maintenance in Mobile Wireless Networks Via Constrained Mobility
January 23, 2011, 12:00am PST
The authors explore distributed mechanisms for maintaining the physical layer connectivity of a mobile wireless network while still permitting significant area coverage. Moreover, they require...
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White Papers
Achieving High Throughput in Low Multiplexed, High Bandwidth, High Delay Environments
January 1, 2008, 12:00am PST
This paper explores combining ECN bits and loss feedback to achieve a high throughput connection in a high bandwidth, low multiplexed environment. In the scheme, a TCP source reacts differently on...
Provided by Columbia University
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White Papers
EasyVPN: IPsec Remote Access Made Easy
January 1, 2008, 12:00am PST
Telecommuting and access over a Wireless LAN require strong security at the network level. Although IPsec is well-suited for this task, it is difficult to configure and operate a large number of...
Provided by Columbia University
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White Papers
Networking Low-Power Energy Harvesting Devices: Measurements and Algorithms
January 14, 2011, 12:00am PST
Recent advances in energy harvesting materials and ultra-low-power communications will soon enable the realization of networks composed of energy harvesting devices. These devices will operate...
Provided by Columbia University
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White Papers
Improved Bounds for Sparse Recovery From Adaptive Measurements
April 30, 2010, 12:00am PDT
It is shown here that adaptivity in sampling results in dramatic improvements in the recovery of sparse signals in white Gaussian noise. An adaptive sampling-and-refinement procedure called...
Provided by Columbia University
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White Papers
Distilled Sensing: Selective Sampling for Sparse Signal Recovery
March 20, 2009, 12:00am PDT
A selective sampling procedure called Distilled Sensing (DS) is proposed, and shown to be an effective method for recovering sparse signals in noise. Based on the notion that it is often easier to...
Provided by Columbia University
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White Papers
A Secure and Privacy-Preserving Targeted Ad-System
February 28, 2010, 12:00am PST
Thanks to its low product-promotion cost and its efficiency, targeted online advertising has become very popular. Unfortunately, being profile-based, online advertising methods violate consumers'...
Provided by Columbia University
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White Papers
GRAND: Git Revisions As Named Data
March 25, 2011, 12:00am PDT
GRAND is an experimental extension of Git, a distributed revision control system, which enables the synchronization of Git repositories over Content-Centric Networks (CCN). GRAND brings some of...
Provided by Columbia University
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White Papers
Usable Secure Private Search
November 6, 2011, 12:00am PDT
It is a common requirement in real world applications for untrusting parties to be able to share sensitive information securely. The authors describe a Secure Anonymous Database Search scheme...
Provided by Columbia University
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White Papers
The Design of the OpenBSD Cryptographic Framework
January 1, 2012, 12:00am PST
Cryptographic transformations are a fundamental building block in many security applications and protocols. To improve performance, several vendors market hardware accelerator cards. However,...
Provided by Columbia University
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White Papers
Bypassing Races in Live Applications With Execution Filter
September 22, 2010, 12:00am PDT
Deployed multi-threaded applications contain many races because these applications are difficult to write, test, and debug. Worse, the number of races in deployed applications may drastically...
Provided by Columbia University
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White Papers
xPF: Packet Filtering for Low-Cost Network Monitoring
January 1, 2008, 12:00am PST
The ever-increasing complexity in network infrastructures is making critical the demand for network monitoring tools. While the majority of network operators rely on low-cost open-source tools...
Provided by Columbia University
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White Papers
Optimizing Frequency Queries for Data Mining Applications
August 8, 2007, 12:00am PDT
Data mining algorithms use various Trie and bitmap-based representations to optimize the support (i.e., frequency) counting performance. This paper compares the memory requirements and support...
Provided by Columbia University
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White Papers
Z2Z: Discovering Zeroconf Services Beyond Local Link
October 5, 2007, 12:00am PDT
The Zeroconf technology, better known as Apple Bonjour, is one of the most prominent solutions for service discovery in local area networks. Zeroconf uses multicast to attain its goal of...
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White Papers
The Impact of TLS on SIP Server Performance: Measurement and Modelling
December 10, 2011, 12:00am PST
Securing VoIP is a crucial requirement for its successful adoption. A key component of this is securing the signaling path, which is performed by SIP. Securing SIP is accomplished by using TLS...
Provided by Columbia University
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White Papers
The SPARCHS Project: Hardware Support for Software Security
July 1, 2011, 12:00am PDT
Current security research is largely oriented to top-down design, where the most exposed layers - the network/application layers - are first studied assuming the lower layers are secure, even when...
Provided by Columbia University
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White Papers
MOVE: An End-to-End Solution to Network Denial of Service
January 1, 2008, 12:00am PST
This paper presents a solution to the Denial of Service (DoS) problem that does not rely on network infrastructure support, conforming to the end-to-end (e2e) design principle. The approach is to...
Provided by Columbia University
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White Papers
Crosstalk-Aware Anycast Routing and Wavelength Assignment in Optical WDM Networks
August 24, 2010, 12:00am PDT
In this paper, the authors discuss the performance of physical-layer impairment-aware anycast communication over transparent optical networks. High-bandwidth applications, such as grid computing...
Provided by Columbia University
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White Papers
Improving BitTorrent: A Simple Approach
January 25, 2008, 12:00am PST
Measurement studies have shown that real world BitTorrent (BT) systems exhibit high seed capacity. Thus, appropriate use of seed capacity can have a significant effect on BT performance. Moreover,...
Provided by Columbia University
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White Papers
The Shapley Value: Its Use and Implications on Internet Economics
September 17, 2008, 12:00am PDT
The Internet is composed of thousand of autonomous Internet Service Providers (ISPs). On the one hand, they cooperate with one another to provide services for their customers; on the other hand,...
Provided by Columbia University
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White Papers
Control Plane Resilience: The Method of Strong Detection
January 1, 2012, 12:00am PST
For the past several decades, work that develops and analyzes network routing protocols has assumed that each network node properly implements the algorithm that establishes routes through the...
Provided by Columbia University
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White Papers
Impact of Load Sharing on Provisioning Services With Consistency Requirements
January 1, 2012, 12:00am PST
Providers of services such as online auctions must provision servers to respond quickly to users' requests. Assigning each service to its own set of servers can result in some servers being...
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White Papers
Managing Access Control in Large Scale Heterogeneous Networks
January 1, 2010, 12:00am PST
The design principle of maximizing local autonomy except when it conflicts with global robustness has led to a scalable Internet with enormous heterogeneity of both applications and...
Provided by Columbia University
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White Papers
Characterizing Self-Healing Software Systems
January 1, 2010, 12:00am PST
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...
Provided by Columbia University
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White Papers
Advertising And Collusion In Retail Markets
November 25, 2007, 12:00am PST
In this paper, authors investigate advertising behaviors of privately informed firms when some consumers use an advertising search rule, whereby they go to the firm that advertises the most. In...
Provided by Columbia University
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White Papers
Meeting QOS Guarantees by End-to-End QOS Monitoring and Adaptation
November 5, 2007, 12:00am PST
The design and implementation of the transport layer of a native ATM protocol stack and its embedding into an overall architecture that provides end-to-end quality of service (QOS) is presented....
Provided by Columbia University
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White Papers
A Market-Based Bandwidth Charging Framework
March 18, 2009, 12:00am PDT
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...
Provided by Columbia University
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White Papers
Swift Fox Whitepaper
February 24, 2010, 12:00am PST
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...
Provided by Columbia University
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White Papers
Requirements for Scalable Access Control and Security Management Architectures
January 1, 2010, 12:00am PST
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...
Provided by Columbia University
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White Papers
Sequential Projection Learning for Hashing With Compact Codes
May 9, 2010, 12:00am PDT
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...
Provided by Columbia University
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White Papers
WebSOS: Protecting Web Servers From DDoS Attacks
January 1, 2010, 12:00am PST
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,...
Provided by Columbia University
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White Papers
Web-Collaborative Filtering: Recommending Music by Spidering The Web
January 1, 2010, 12:00am PST
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...
Provided by Columbia University
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White Papers
Outsourcing: Is the Third Industrial Revolution Really Around the Corner?
September 1, 2007, 12:00am PDT
Job losses due to a shift of economic activities from home to abroad had been debated almost as long as free trade. The traditional "Employment Argument for Protection" has focused on merchandise...
Provided by Columbia University
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White Papers
Apiary: Easy-to-Use Desktop Application Fault Containment on Commodity Operating Systems
May 7, 2010, 12:00am PDT
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...
Provided by Columbia University
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White Papers
Professor McGrath On Discovery-Driven Growth
April 14, 2010, 12:00am PDT
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...
Provided by Columbia University
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White Papers
Theory Into Practice: Change Management: One Of The Most Crucial Tests Of Leadership
March 14, 2008, 12:00am PDT
One of the most challenging business situations that leaders can face is to guide people through change. According to Joel Brockner, Phillip Hettleman Professor of Business and Chair of Management...
Provided by Columbia University
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White Papers
Spotlight: Strategy Is Action - Not Just A Word
March 14, 2008, 12:00am PDT
Strategy. The word itself conjures excitement, even intrigue. But strategy is not just a word: it is an action. "Most participants come to a strategy program because they recognize that it is an...
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White Papers
Aligning Technology With Business Strategy
October 5, 2009, 12:00am PDT
"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...
Provided by Columbia University
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White Papers
Mastering Strategy: What The Experts Say
October 5, 2009, 12:00am PDT
"Most participants come to a strategy program because they recognize that it is an essential part of leading effectively," says Willie Pietersen, Professor of The Practice of Management, Columbia...
Provided by Columbia University
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White Papers
Motivating During Times Of Change
April 14, 2010, 12:00am PDT
Managers facing the task of doing more with fewer resources during this economic recovery can turn critical situations into opportunities to show their sophistication as leaders. "Change...
Provided by Columbia University
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White Papers
Neuroscience's Lessons For Leadership
June 29, 2010, 12:00am PDT
Understanding some basic lessons from neuroscience can make you a more effective leader - and help you avoid mental practices that carry serious risks for your health, according to executive coach...
Provided by Columbia University
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White Papers
Integrating China Into Your Global Business Strategy
June 29, 2010, 12:00am PDT
A new program, Global Business Strategy: China, will be offered by Columbia Business School Executive Education August 5-6, 2010. Presented in partnership with Cheung Kong Graduate School of...
Provided by Columbia University
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White Papers
General Management: Making The Transition To Cross-Functional Leadership
June 29, 2010, 12:00am PDT
David Dinsmore, editor of the Scottish Sun, hopes to transition to a general management role in the future and took advantage of The General Management Leadership Program last fall to prepare. As...
Provided by Columbia University
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White Papers
Building A New Leadership Perspective In Four Weeks
June 29, 2010, 12:00am PDT
Though the idea of leaving work for four weeks may seem daunting, many executives are embracing the opportunity to undergo a transformative experience. The Columbia Senior Executive Program, a...
Provided by Columbia University
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White Papers
Investor Attitudes Towards Risk And Uncertainty And Reactions To Market Turmoil
June 28, 2010, 12:00am PDT
In order to assess how individual small investors have reacted to recent adverse events in world financial markets and whether these reactions are mediated by their risk attitudes, a survey was...
Provided by Columbia University
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White Papers
Prudential Bank Regulation: What~s Broke And How To Fix It
April 1, 2009, 12:00am PDT
Financial crises produce regulatory reactions, for better or worse, often for worse. The reforms in reaction to the current crisis have not yet been settled, and prospects for reform are mixed....
Provided by Columbia University
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White Papers
A Counter-Cyclical Framework For A Development-Friendly International Financial Architecture
June 1, 2007, 12:00am PDT
The major task of a development-friendly international financial architecture is to mitigate procyclical effects of financial markets and open "policy space" for counter-cyclical macroeconomic...
Provided by Columbia University
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White Papers
Staffing And Control Of Many-Server Service Systems
April 16, 2008, 12:00am PDT
This paper considers large-scale service systems with multiple customer classes and agent types. Customers are classified according to their processing requirements, service-level guarantees, or...
Provided by Columbia University
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White Papers
The Probability Of Default, Excessive Risk, And Executive Compensation
February 1, 2010, 12:00am PST
The financial crisis of 2008 has many causes, with the role of executive compensation in creating excessive risk taking being frequently cited in the press and by policy makers as a leading...
Provided by Columbia University
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White Papers
Preference For New Product Information Sources
June 18, 2008, 12:00am PDT
This paper examines the preferences of advice seekers for human information sources. The authors focus on advice providers who are high in technical expertise (technical knowledge) and/or social...
Provided by Columbia University
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White Papers
Does AMD Spur Intel To Innovate More?
July 29, 2009, 12:00am PDT
The authors of this paper estimate a model of dynamic oligopoly with durable goods and endogenous innovation to examine the effect of competition on innovation in the PC microprocessor industry....
Provided by Columbia University
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White Papers
Engaging Consumers, Creating Value
August 31, 2009, 12:00am PDT
Findings on value creation and regulatory fit offer far-ranging implications for management, marketing and even mental health. Value - how much importance or worth people place on any given thing...
Provided by Columbia University
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White Papers
Deriving Value From Social Commerce Networks
April 6, 2010, 12:00am PDT
Social commerce is an emerging trend in which sellers are connected in online social networks, and where sellers are individuals instead of firms. This paper examines the economic value...
Provided by Columbia University
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White Papers
Strategy As Learning
April 22, 2010, 12:00am PDT
Businesses that seek sustainable competitive advantage must set aside the view that strategy is planning and embrace the idea that strategy is learning, says Willie Pietersen - Professor of the...
Provided by Columbia University
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White Papers
A Conversation With ... Rita Gunther McGrath, On Obstacles To Innovation-Led Growth
January 26, 2009, 12:00am PST
In this conversation with Ruth Gunther McGrath, faculty director - Columbia University, she covers her views on on Obstacles to Innovation-Led Growth. Ruth maintains that the economic problems are...
Provided by Columbia University
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White Papers
The Art Of Choosing
March 26, 2010, 12:00am PDT
This story covers professor Sheena Iyengar's views on strategies for managing choices in an era of seemingly boundless options. Sheena Iyengar is the S. T. Lee Professor of Business in the...
Provided by Columbia University
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White Papers
Smartphones and Emerging Markets: A New Technology Revolution?
June 17, 2009, 12:00am PDT
It is no secret that the mobile phone industry is thriving in emerging markets, and that this growth has helped make cell phones the fastest spreading technology in human history. Less known, but...
Provided by Columbia University
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White Papers
The Cost Of Latency
March 16, 2010, 12:00am PDT
Modern electronic markets have been characterized by a relentless drive towards faster decision making. Significant technological investments have lead to dramatic improvements in latency, or, the...
Provided by Columbia University
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White Papers
Too Small To Fail?
January 26, 2009, 12:00am PST
Innovative, upstart ventures have a crucial role to play in economic recovery, says Michael A. M. Keehner, who suggests it may be time to give entrepreneurs a stimulus package of their own....
Provided by Columbia University
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White Papers
Reflexive Modeling For An Uncertain Economy
February 3, 2009, 12:00am PST
Models pose a paradox. They hold the key to extraordinary profits but can inflict destructive losses on a bank. Because a model entails a complex perspective on issues that are typically fuzzy and...
Provided by Columbia University
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White Papers
Strategic Competition in Social Entrepreneurship
December 8, 2008, 12:00am PST
This post on the challenges facing social entrepreneurship is drawn from remarks made on October. 23, 2008 at "Leadership for the 21st Century," an interactive training session held at the U.S....
Provided by Columbia University
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White Papers
From The Start-Up Frontline
June 19, 2009, 12:00am PDT
For the MBA grad who is launching his or her own venture this year, the current economy is a mixed blessing. "Suddenly every investment banker wants to be an entrepreneur," says Tom Bowen Wright...
Provided by Columbia University
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