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Harvard University
(166 results)-
White Papers
Denoising Strategy for Convolutionally - Coded Bidirectional Relaying
September 28, 2008, 12:00am PDT
In this paper, the authors present a forwarding strategy for bidirectional relaying channels in which Trellis-Coded Modulation (TCM) is employed. They focus on a DeNoise-and-Forward (DNF)...
Provided by Harvard University
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White Papers
Optimized Constellations for Two - Way Wireless Relaying With Physical Network Coding
February 21, 2009, 12:00am PST
The authors investigate modulation schemes optimized for two-way wireless relaying systems, for which network coding is employed at the physical layer. They consider network coding based on...
Provided by Harvard University
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White Papers
What We Still Don't Know About Monetary And Fiscal Policy
November 3, 2010, 12:00am PDT
Two thousand and seven may seem an odd moment to question what we know about monetary policy. The past quarter-century has been about as good a run, at least in aggregate dimensions, as one is...
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White Papers
CloudSense: Continuous Fine-Grain Cloud Monitoring With Compressive Sensing
May 18, 2011, 12:00am PDT
Continuous fine-grain status monitoring of a cloud data center enables rapid response to anomalies, but handling the resulting torrent of data poses a significant challenge. As a solution, the...
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White Papers
LiveNet: Using Passive Monitoring to Reconstruct Sensor Network Dynamic
April 3, 2008, 12:00am PDT
The authors describe LiveNet, a set of tools and analysis methods for reconstructing the complex behavior of a deployed sensor network. LiveNet is based on the use of multiple passive packet...
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White Papers
Speculative Pipelining for Compute Cloud Programming
August 31, 2010, 12:00am PDT
MapReduce job execution typically occurs in sequential phases of parallel steps. These phases can experience unpredictable delays when available computing and network capacities fluctuate or when...
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White Papers
Collaborative Compressive Spectrum Sensing in a UAV Environment
August 15, 2011, 12:00am PDT
Spectrum sensing is of fundamental importance to many wireless applications including cognitive radio channel assignment and radiolocation. However, conventional spectrum sensing can be...
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White Papers
Achieving High Throughput Ground-to-UAV Transport Via Parallel Links
May 15, 2011, 12:00am PDT
Wireless data transfer under high mobility, as found in Unmanned Aerial Vehicle (UAV) applications, is a challenge due to varying channel quality and extended link outages. The authors present...
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White Papers
Sign-Based Spectral Clustering
March 1, 2010, 12:00am PST
Sign-based spectral clustering performs data grouping based on signs of components in the eigenvectors of the input. This paper introduces the concept of sign-based clustering, proves some of its...
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White Papers
A Location-Dependent Runs-and-Gaps Model for Predicting TCP Performance Over a UAV Wireless Channel
August 27, 2010, 12:00am PDT
In this paper, the authors use a finite-state model to predict the performance of the Transmission Control Protocol (TCP) over a varying wireless channel between an Unmanned Aerial Vehicle (UAV)...
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White Papers
Flowcode: Multi-Site Data Exchange Over Wireless Ad-Hoc Networks Using Network Coding
September 6, 2009, 12:00am PDT
The authors present FlowCode, a system that exploits network coding at the granularity of traffic flows to facilitate fault-tolerant data exchange in wireless mesh networks. Applications include...
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White Papers
A Spectral Clustering Approach to Validating Sensors Via Their Peers in Distributed Sensor Networks
May 17, 2009, 12:00am PDT
In a distributed sensor network, the goodness of a sensor may change according to its current device status (e.g., health of hardware) and environment (e.g., wireless reception conditions at the...
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White Papers
Achievable Rates and Scaling Laws for Cognitive Radio Channels
October 23, 2007, 12:00am PDT
Cognitive radios have the potential to vastly improve communication over wireless channels. The authors outline recent information theoretic results on the limits of primary and cognitive user...
Provided by Harvard University
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White Papers
Relay Selection Methods for Wireless Cooperative Communications
February 22, 2008, 12:00am PST
The authors study the problem of relay selection in a wireless cooperative network. Assuming a single source, a single destination, and N uniformly distributed candidate relays, they seek to...
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White Papers
The Primary Exclusive Region in Cognitive Networks
January 5, 2008, 12:00am PST
Cognitive networks are becoming a reality. Such networks consist of primary nodes, which have priority access to the spectrum, and cognitive (secondary) nodes, which access the spectrum according...
Provided by Harvard University
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White Papers
Capacity Bounds on Multi-Pair Two-Way Communication With a Base-Station Aided by a Relay
April 27, 2010, 12:00am PDT
The simplest bi-directional relay network consists of a pair of terminal nodes that wish to exchange messages through the use of a single relay. While the capacity of this channel is still unknown...
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White Papers
ACO Routing in Wireless Sensor Networks
January 15, 2008, 12:00am PST
The recent popularity of applications based on wireless sensor networks provides a strong motivation for pushing its technological limits. The authors feel that sensor networks can benefit from...
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White Papers
Information-Theoretic Limits of Dense Underwater Networks
October 17, 2011, 12:00am PDT
Information-theoretic throughput scaling laws are analyzed in an underwater acoustic network with n regularly located nodes on a unit square, in which both bandwidth and received signal power can...
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White Papers
A Study on the Optimal Degree-of-Freedoms of Cellular Networks: Opportunistic Interference Mitigation
November 22, 2010, 12:00am PST
The authors introduce an Opportunistic Interference Mitigation (OIM) protocol for cellular networks, where a user scheduling strategy is utilized in uplink K-cell environments with time-invariant...
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White Papers
Impact of Correlation on Linear Precoding in QSTBC Coded Systems With Linear MSE Detection
August 6, 2007, 12:00am PDT
In this paper, the authors study a wireless multiple-input multiple-output system in a Rayleigh flat-fading environment with correlation among the transmit antennas. They assume that the receiver...
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White Papers
Cognitive Sensing Based on Side Information
March 31, 2008, 12:00am PDT
The authors study a sensing algorithm for cognitive radios based on Bayesian energy detection while utilizing available side information. The side information available to the cognitive user can...
Provided by Harvard University
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White Papers
Layering in Provenance Systems
April 21, 2009, 12:00am PDT
Digital provenance describes the ancestry or history of a digital object. Most existing provenance systems, however, operate at only one level of abstraction: the system call layer, a workflow...
Provided by Harvard University
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White Papers
Causality-Based Versioning
January 13, 2009, 12:00am PST
Versioning file systems provide the ability to recover from a variety of failures, including file corruption, virus and worm infestations, and user mistakes. However, using versions to recover...
Provided by Harvard University
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White Papers
Popularity Is Everything a New Approach to Protecting Passwords From Statistical-Guessing Attacks
July 13, 2010, 12:00am PDT
The authors propose to strengthen user-selected passwords against statistical-guessing attacks by allowing users of Internet-scale systems to choose any password they want-so long as it's not...
Provided by Harvard University
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White Papers
On the Zero-Error Capacity Threshold for Deletion Channels
January 31, 2011, 12:00am PST
The authors consider the zero-error capacity of deletion channels. Specifically, they consider the setting where they choose a codebook C consisting of strings of n bits, and their model of the...
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White Papers
An Improved Analysis of the Lossy Difference Aggregator
September 14, 2009, 12:00am PDT
The authors provide a detailed analysis of the Lossy Difference Aggregator, a recently developed data structure for measuring latency in a router environment where packet losses can occur. Their...
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White Papers
Some Open Questions Related to Cuckoo Hashing
June 22, 2009, 12:00am PDT
Hash-based data structures and algorithms are currently a booming industry in the Internet, particularly for applications related to measurement, monitoring, and security. Hash tables and related...
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White Papers
On the Performance of Multiple Choice Hash Tables With Moves on Deletes and Inserts
September 15, 2008, 12:00am PDT
High-performance hashing has become a fundamental subroutine for a wide variety of high performance network processing tasks, including header lookup for routing, measurement, and monitoring. In...
Provided by Harvard University
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White Papers
A Survey of Results for Deletion Channels and Related Synchronization Channels
June 23, 2008, 12:00am PDT
The binary symmetric channel, where each bit is independently received in error with probability p, and the binary erasure channel, where each bit is erased with probability p, enjoy a long and...
Provided by Harvard University
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White Papers
Provenance Integration Requires Reconciliation
May 24, 2011, 12:00am PDT
While there has been a great deal of research on provenance systems, there has been little discussion about challenges that arise when making different provenance systems interoperate. In fact,...
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White Papers
Provenance Map Orbiter: Interactive Exploration of Large Provenance Graphs
May 22, 2011, 12:00am PDT
Provenance systems can produce enormous provenance graphs that can be used for a variety of tasks from determining the inputs to a particular process to debugging entire workflow executions or...
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White Papers
Collecting Provenance Via the Xen Hypervisor
May 24, 2011, 12:00am PDT
The Provenance Aware Storage Systems project (PASS) currently collects system-level provenance by intercepting system calls in the Linux kernel and storing the provenance in a stackable...
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White Papers
Benchmarking File System Benchmarking: It is Rocket Science
April 13, 2011, 12:00am PDT
The quality of file system benchmarking has not improved in over a decade of intense research spanning hundreds of publications. Researchers repeatedly use a wide range of poorly designed...
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White Papers
Multicore OSes: Looking Forward From 1991, er, 2011
April 14, 2011, 12:00am PDT
Upcoming multicore processors, with hundreds of cores or more in a single chip, require a degree of parallel scalability that is not currently available in today's system software. Based on prior...
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White Papers
Improving Performance Isolation on Chip Multiprocessors Via an Operating System Scheduler
June 29, 2007, 12:00am PDT
The authors describe a new operating system scheduling algorithm that improves performance isolation on Chip MultiProcessors (CMP). Poor performance isolation occurs when an application's...
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White Papers
Towards Query Interoperability: PASSing PLUS
February 16, 2010, 12:00am PST
The authors describe their experiences importing PASS provenance into PLUS. Although both systems import and export provenance that conforms to the Open Provenance Model (OPM), the two systems...
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White Papers
Tracking Back References in a Write-Anywhere File System
February 2, 2010, 12:00am PST
Many file systems reorganize data on disk, for example to defragment storage, shrink volumes, or migrate data between different classes of storage. Advanced file system features such as snapshots,...
Provided by Harvard University
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White Papers
A Class of Bi-Directional Multi-Relay Protocols
April 29, 2009, 12:00am PDT
In a bi-directional relay channel, two nodes wish to exchange independent messages over a shared wireless half-duplex channel with the help of relays. Recent work has considered information...
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White Papers
Roughness of Microarchitectural Design Topologies and Its Implications for Optimization
December 19, 2007, 12:00am PST
Recent advances in statistical inference and machine learning close the divide between simulation and classical optimization, thereby enabling more rigorous and robust micro-architectural studies....
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White Papers
A Non-Work-Conserving Operating System Scheduler for SMT Processors
January 1, 2011, 12:00am PST
Simultaneous Multi-Threading (SMT) processors run multiple threads simultaneously on a single processing core. Because concurrent threads compete for the processor's shared resources,...
Provided by Harvard University
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White Papers
The Task And Temporal Microstructure Of Productivity: Evidence From Japanese Financial Services
July 5, 2010, 12:00am PDT
Sustaining workers' productivity is critical to organizations' operational success. Yet, comparatively little attention has been given to how managers can effectively allocate work across tasks...
Provided by Harvard University
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White Papers
See No Evil: When We Overlook Other People's Unethical Behavior
January 2, 2008, 12:00am PST
It is common for people to be more critical of others' ethical choices than of their own. This paper explores those remarkable circumstances in which people see no evil in others' unethical...
Provided by Harvard University
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White Papers
Exploring Inventory Trends In Six U.S. Retail Segments
August 7, 2008, 12:00am PDT
The authors find that inventory is positively correlated to gross profit dollars but negatively correlated to gross margin return on inventory. This supports a potential explanation: Inventory...
Provided by Harvard University
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White Papers
Organizational Design And Control across Multiple Markets: The Case Of Franchising In The Convenience Store Industry
April 2, 2008, 12:00am PDT
Many companies operate units which are dispersed across different types of markets, and thus serve significantly diverging customer bases. Such market-type dispersion is likely to compromise the...
Provided by Harvard University
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White Papers
The Decentering Of The Global Firm
September 1, 2008, 12:00am PDT
This paper describes recent changes in the relationship between firms and nation states. Firms are typically linked to the nation in which they began and are considered to have fixed national...
Provided by Harvard University
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White Papers
An Exploration Of The Japanese Slowdown During The 1990s
November 1, 2008, 12:00am PDT
This paper shows that a real business cycle model with TFP shocks can reproduce the Japanese fluctuations over the 1990s in output, consumption and investment. This implies that standard macro...
Provided by Harvard University
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White Papers
Dishonest Deed, Clear Conscience: Self-Preservation Through Moral Disengagement And Motivated Forgetting
April 29, 2009, 12:00am PDT
People routinely engage in dishonest acts without feeling guilty about their behavior. Across four studies, people justified their dishonest deeds through moral disengagement and exhibited...
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White Papers
Goals Gone Wild: The Systematic Side Effects Of Over-Prescribing Goal Setting
February 17, 2009, 12:00am PST
Goal setting is one of the most replicated and influential paradigms in the management literature. Hundreds of studies conducted in numerous countries and contexts have consistently demonstrated...
Provided by Harvard University
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White Papers
Securing Jobs Or The New Protectionism?: Taxing The Overseas Activities Of Multinational Firms
March 23, 2009, 12:00am PDT
Tax policy toward American multinational firms would appear to be approaching a crossroads. The presumed linkages between domestic employment conditions and the growth of foreign operations by...
Provided by Harvard University
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White Papers
File-Sharing And Copyright
May 15, 2009, 12:00am PDT
The advent of file-sharing technology has allowed consumers to copy music, books, video games and other protected works on an unprecedented scale at minimal cost. In this paper, the authors ask...
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White Papers
Truth In Giving: Experimental Evidence On The Welfare Effects Of Informed Giving To The Poor
May 15, 2009, 12:00am PDT
It is often difficult for donors to predict the value of charitable giving because they know little about the persons who receive their help. This concern is particularly acute when making...
Provided by Harvard University
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White Papers
The Optimal Taxation Of Height: A Case Study Of Utilitarian Income Redistribution
June 11, 2009, 12:00am PDT
The standard Utilitarian framework for tax analysis answers this question in the affirmative. This paper can be interpreted in one of two ways. One interpretation is that personal attributes...
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White Papers
In Favor Of Clear Thinking: Incorporating Moral Rules Into A Wise Cost-benefit Analysis
July 9, 2009, 12:00am PDT
The authors have contributed an interesting paper on the comparative benefit of moral rules versus cost-benefit analysis. Many of their specific comments are accurate, useful, and insightful. At...
Provided by Harvard University
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White Papers
The Impact Of Private Equity Ownership On Portfolio Firms? Corporate Tax Planning
March 4, 2010, 12:00am PST
This paper investigates whether private equity (PE) firms influence the tax practices of their portfolio firms. Prior research documents that PE firms create economic value in portfolio firms...
Provided by Harvard University
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White Papers
The End Of Chimerica
October 1, 2009, 12:00am PDT
For the better part of the past decade, the world economy has been dominated by a world economic order that combined Chinese export-led development with US overconsumption. First, the scale of...
Provided by Harvard University
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White Papers
Does Product Market Competition Lead Firms To Decentralize?
January 11, 2010, 12:00am PST
In this paper the authors investigate whether greater product market competition increases decentralization. To tackle the issues they collected detailed information on the internal organization...
Provided by Harvard University
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White Papers
Payout Taxes And The Allocation Of Investment
November 1, 2010, 12:00am PDT
When corporate payout is taxed, internal equity is cheaper than external equity. If there are no perfect substitutes for equity finance, payout taxes may therefore have an effect on the investment...
Provided by Harvard University
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White Papers
Letting Misconduct Slide: The Acceptability Of Gradual Erosion In Others? Unethical Behavior
December 10, 2008, 12:00am PST
Four laboratory studies show that people are more likely to overlook others' unethical behavior when ethical degradation occurs slowly rather than in one abrupt shift. Participants served in the...
Provided by Harvard University
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White Papers
Do Friends Influence Purchases In A Social Network?
February 26, 2009, 12:00am PST
Social networks, such as Facebook and MySpace have witnessed a rapid growth in their membership. Some of these businesses have tried an advertising-based model with very limited success. However,...
Provided by Harvard University
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White Papers
Broadband: Remaking The Advertising Industry
September 17, 2007, 12:00am PDT
Evolving from the Marlboro Man in the 1960s to the Subservient Chicken in a recent Web campaign, advertising is undergoing a radical transformation. Harvard Business School professor Stephen P....
Provided by Harvard University
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White Papers
Social Networks, Personalized Advertising, And Privacy Controls
August 6, 2010, 12:00am PDT
This paper investigates how internet users' perception of control over their personal information affects how likely they are to click on online advertising. The paper uses data from a randomized...
Provided by Harvard University
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White Papers
Green Computing: Can Computation Advance Sustainability? An Exploration
January 11, 2010, 12:00am PST
The Green Computing Project was launched in January 2009 as a development and networking effort intended to bring the IIC's multidisciplinary approach to computational science and engineering to...
Provided by Harvard University
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White Papers
Financial Literacy: An Essential Tool For Informed Consumer Choice?
February 1, 2008, 12:00am PST
Increasingly, individuals are in charge of their own financial security and are confronted with ever more complex financial instruments. However, there is evidence that many individuals are not...
Provided by Harvard University
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White Papers
Climate Finance: Key Concepts And Ways Forward
December 2, 2009, 12:00am PST
Climate finance is fundamental to curbing anthropogenic climate change. Compared, however, to the negotiations over emissions reduction timetables, commitments, and architectures, climate finance...
Provided by Harvard University
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White Papers
Business Diversification Strategies In U.S. And Japanese Electric Utilities
August 5, 2008, 12:00am PDT
Since the deregulation of electric utilities in 2000, Japanese electric power companies have been trying to expand their business activities to other fields. In other words, they are making...
Provided by Harvard University
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White Papers
Small Menu Costs And Large Business Cycles: A Macroeconomic Model Of Monopoly
July 26, 2007, 12:00am PDT
The conflict between modern neoclassical and traditional Keynesian theories of the business cycle centers upon the pricing mechanism.' In neoclassical models, prices are fully flexible. They...
Provided by Harvard University
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White Papers
Provenance as First Class Cloud Data
October 31, 2009, 12:00am PDT
Digital provenance is meta-data that describes the ancestry or history of a digital object. Most work on provenance focuses on how provenance increases the value of data to consumers. However,...
Provided by Harvard University
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White Papers
Cloud Computing & National Security Law
October 2, 2010, 12:00am PDT
In recent years, many computer and Internet functions have moved from users' computers to remote servers that make up a "Cloud" of data and processing power. "Cloud computing" has transformed...
Provided by Harvard University
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White Papers
How Can Decision Making Be Improved?
July 18, 2008, 12:00am PDT
The optimal moment to address the question of how to improve human decision making has arrived. Thanks to fifty years of research by judgment and decision making scholars, psychologists have...
Provided by Harvard University
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White Papers
CAD and Image Standards for Construction Documentation
September 15, 2009, 12:00am PDT
This paper outlines how to produce and deliver CAD drawings and raster images of as-built construction drawings. For purposes of this document image files refer to the TIF format. The University...
Provided by Harvard University
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White Papers
Knowledge Management: Evaluating The Organizational Requirements And Culture
December 19, 2007, 12:00am PST
The purpose of this paper is to explore the application of knowledge management concepts to an Information Systems (IS) knowledge base, as opposed to a clinical one. The field of Medical...
Provided by Harvard University
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White Papers
Making a Cloud Provenance-Aware
February 11, 2009, 12:00am PST
The advent of cloud computing provides a cheap and convenient mechanism for scientists to share data. The utility of such data is obviously enhanced when the provenance of the data is also...
Provided by Harvard University
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White Papers
Application-Specific Hardware Design for Wireless Sensor Network Energy and Delay Reduction
March 13, 2009, 12:00am PDT
Battery-powered embedded systems, such as Wireless Sensor Network (WSN) motes, require low energy usage to extend system lifetime. WSN motes must power sensors, a processor, and a radio for...
Provided by Harvard University
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White Papers
Implementing Public-Key Infrastructure for Sensor Networks
August 29, 2008, 12:00am PDT
Through instrumentation of UC Berkeley's TinySec module, authors argue that, although symmetric cryptography has been tractable in this domain for some time, there has remained a need, unfulfilled...
Provided by Harvard University
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White Papers
CTPPL: A Continuous Time Probabilistic Programming Language
June 6, 2009, 12:00am PDT
Probabilistic programming languages are an exciting development in probabilistic knowledge representation. They allow a modeler to build probabilistic models using complex data structures with all...
Provided by Harvard University
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White Papers
CitySense: An Urban-Scale Wireless Sensor Network and Testbed
April 17, 2008, 12:00am PDT
This paper presents the vision for an open, urban-scale wireless networking testbed, called CitySense, with the goal of supporting the development and evaluation of novel wireless systems that...
Provided by Harvard University
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White Papers
Tips for Identity Theft Protection
November 15, 2008, 12:00am PST
An identity thief takes personal information and uses it without knowledge. The thief may run up debts or even commit crimes in name. The following tips can help lower risk of becoming a victim...
Provided by Harvard University
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White Papers
The Consequence of Non-Cooperation in the Fight Against Phishing
October 16, 2008, 12:00am PDT
A key way in which banks mitigate the effects of phishing is to have fraudulent websites removed or abusive domain names suspended. This 'Take-Down' is often subcontracted to specialist companies....
Provided by Harvard University
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White Papers
Evil Searching: Compromise and Recompromise of Internet Hosts for Phishing
February 25, 2009, 12:00am PST
Criminals use web servers to host phishing websites that impersonate financial institutions, to send out email spam, to distribute malware, and for many other illegal activities. To reduce costs,...
Provided by Harvard University
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White Papers
Temporal Correlations Between Spam and Phishing Websites
January 1, 2009, 12:00am PST
To implement a phishing scam, attackers must create a fake website and send spam to attract visitors. To date, empirical research into phishing's impact has studied either the spam being sent or...
Provided by Harvard University
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