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Coherent Control Of Nanomagnet Dynamics Via Ultrafast Spin Torque Pulses, Samir Garzon, Longfei Ye, Richard A. Webb, Thomas M. Crawford, Mark Covington, Shehzaad Kaka Nov 2008

Coherent Control Of Nanomagnet Dynamics Via Ultrafast Spin Torque Pulses, Samir Garzon, Longfei Ye, Richard A. Webb, Thomas M. Crawford, Mark Covington, Shehzaad Kaka

Faculty Publications

We demonstrate reliable manipulation of the magnetization dynamics of a precessing nanomagnet by precisely controlling the spin transfer torque on the subnanosecond time scale. Using a simple pulse shaping scheme consisting of two ultrafast spin torque pulses with variable amplitudes and delay, we demonstrate coherent control over the precessional orbits and the ability to tune the switching probability of a nanomagnet at room temperature and 77 K. Our measurements suggest that appropriately shaped spin transfer can be used to efficiently manipulate the orientation of a free layer nanomagnet, thus providing an alternative for spin torque driven spintronic devices.

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Effect Of Treating Field Spatial Variability In Winter Wheat At Different Resolutions, B. S. Tubaña, D. B. Arnall, S. L. Holtz, J. B. Solie, K. Girma, W. R. Raun Nov 2008

Effect Of Treating Field Spatial Variability In Winter Wheat At Different Resolutions, B. S. Tubaña, D. B. Arnall, S. L. Holtz, J. B. Solie, K. Girma, W. R. Raun

Faculty Publications

This study was conducted to determine the scale at which spatial variability should be treated using an in-season nitrogen fertilization optimization algorithm (NFOA). Treatments included variable nitrogen (N) rate applications at three resolutions (0.84, 13.4, and 26.8 m2), two treatments of 90 kg N ha-1 fixed rate applied preplant or midseason, and a check plot. Treatments were arranged in a completely randomized design with three replications established at two locations for three years. On average, the NFOA-based N rates achieved a higher N use efficiency (NUE) of 41% compared with only 33% of the 90 kg N ha-1 fixed rate …

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Commercial Evaluation Of A Continuous Micronutrient Fortification Process For Nixtamal Tortillas, Michael L. Dunn, Sergio O. Serna-Saldivar, Diana Sanchez-Hernandez, Robert W. Griffin Nov 2008

Commercial Evaluation Of A Continuous Micronutrient Fortification Process For Nixtamal Tortillas, Michael L. Dunn, Sergio O. Serna-Saldivar, Diana Sanchez-Hernandez, Robert W. Griffin

Faculty Publications

The corn tortilla plays an integral role in the Mexican diet and is an ideal vehicle for micronutrient fortification. Approximately 60% of corn tortillas in Mexico are produced from nixtamal, with the remainder prepared from masa flour. A process for continuous fortification of nixtamal tortillas was evaluated in two commercial mills in Mexico. A commercial powder dosifier was used to add micronutrient premix containing iron, zinc, folic acid, niacin, riboflavin, and thiamin to nixtamal (1 g/kg) as it was milled. After training and preliminary sampling, mills produced fortified tortillas unassisted for four weeks. Masa flow rates over a four-day period …

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A Competitive Hybridization Model Predicts Probe Signal Intensity On High Density Dna Microarrays, Shuzhao Li, Alex Pozhitkov, Marius Brouwer Nov 2008

A Competitive Hybridization Model Predicts Probe Signal Intensity On High Density Dna Microarrays, Shuzhao Li, Alex Pozhitkov, Marius Brouwer

Faculty Publications

A central, unresolved problem of DNA microarray technology is the interpretation of different signal intensities from multiple probes targeting the same transcript. We propose a competitive hybridization model for DNA microarray hybridization. Our model uses a probe-specific dissociation constant that is computed with current nearest neighbor model and existing parameters, and only four global parameters that are fitted to Affymetrix Latin Square data. This model can successfully predict signal intensities of individual probes, therefore makes it possible to quantify the absolute concentration of targets. Our results offer critical insights into the design and data interpretation of DNA microarrays.

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Evaluating Shape Correspondence For Statistical Shape Analysis: A Benchmark Study, Brent C. Munsell, Pahal Dalal, Song Wang Nov 2008

Evaluating Shape Correspondence For Statistical Shape Analysis: A Benchmark Study, Brent C. Munsell, Pahal Dalal, Song Wang

Faculty Publications

This paper introduces a new benchmark study to evaluate the performance of landmark-based shape correspondence used for statistical shape analysis. Different from previous shape-correspondence evaluation methods, the proposed benchmark first generates a large set of synthetic shape instances by randomly sampling a given statistical shape model that defines a ground-truth shape space. We then run a test shape-correspondence algorithm on these synthetic shape instances to identify a set of corresponded landmarks. According to the identified corresponded landmarks, we construct a new statistical shape model, which defines a new shape space. We finally compare this new shape space against the ground-truth …

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Numerical Simulation Of Local Temperature Distortions During Ice Nucleation Of Cells In Suspension, D. Kandra, R. V. Devireddy Nov 2008

Numerical Simulation Of Local Temperature Distortions During Ice Nucleation Of Cells In Suspension, D. Kandra, R. V. Devireddy

Faculty Publications

Knowledge of intercellular ice formation in cells embedded in an extra-cellular suspension is essential for effective design of freezing protocols. The presence of cell membrane causes super-cooling of the intra-cellular region, which nucleates at much lower temperatures than the surrounding extra-cellular space and is accompanied by the exothermic release of the latent heat. This is a dynamic process and causes thermal distortions in and around the cell where nucleation occurs. In the present study, an attempt has been made to numerically determine the magnitude of thermal distortion (ΔT) and the time (dt) it takes for this distortion to damp out …

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Diversity, Multiculturalism, And Pluralism: A James White Library Bibliography, Terry Dwain Robertson Nov 2008

Diversity, Multiculturalism, And Pluralism: A James White Library Bibliography, Terry Dwain Robertson

Faculty Publications

A bibliography of books available in the James White Library addressing issues of diversity, multiculturalism, and pluralism in the disciplines of business, education, political science, religion, and sociology.

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Restoration Of Dredged Canals In Wetlands: A Comparison Of Methods, Joseph Baustian, R. Eugene Turner, Nancy F. Walters, David P. Muth Oct 2008

Restoration Of Dredged Canals In Wetlands: A Comparison Of Methods, Joseph Baustian, R. Eugene Turner, Nancy F. Walters, David P. Muth

Faculty Publications

A comparison of two methods for restoring dredged canals to wetlands was examined at the Jean Lafitte National Historical Park and Preserve’s Barataria Preserve Unit near New Orleans, LA. Both northern and southern canals had the remnant dredged spoil material returned to the canal, but the southern canal had additional sediment pumped in from a nearby lake. The water depth in the southern canal shallowed significantly from 1.2 to 0.4 m following backfilling and sediment addition, while the depth of the northern canal (which received no additional sediment) remained unchanged following backfilling. Neither site had complete soil restoration, but the …

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Halothiobacillus Neapolitanus Carboxysomes Sequester Heterologous And Chimeric Rubisco Species, Balaraj B. Menon, Zhicheng Dou, Sabine Heinhorst, Jessup M. Shively, Gordon C. Cannon Oct 2008

Halothiobacillus Neapolitanus Carboxysomes Sequester Heterologous And Chimeric Rubisco Species, Balaraj B. Menon, Zhicheng Dou, Sabine Heinhorst, Jessup M. Shively, Gordon C. Cannon

Faculty Publications

Background: The carboxysome is a bacterial microcompartment that consists of a polyhedral protein shell filled with ribulose 1,5-bisphosphate carboxylase/oxygenase (RubisCO), the enzyme that catalyzes the first step of CO(2) fixation via the Calvin-Benson-Bassham cycle. Methodology/Principal Findings: To analyze the role of RubisCO in carboxysome biogenesis in vivo we have created a series of Halothiobacillus neapolitanus RubisCO mutants. We identified the large subunit of the enzyme as an important determinant for its sequestration into alpha-carboxysomes and found that the carboxysomes of H. neapolitanus readily incorporate chimeric and heterologous RubisCO species. Intriguingly, a mutant lacking carboxysomal RubisCO assembles empty carboxysome shells of …

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Extreme-Ultraviolet Polarimeter Utilizing Laser-Generated High-Order Harmonics, Nicole Brimhall, Matthew Turner, Nicholas Herrick, David D. Allred, R. Steven Turley, Michael Ware, Justin Peatross Oct 2008

Extreme-Ultraviolet Polarimeter Utilizing Laser-Generated High-Order Harmonics, Nicole Brimhall, Matthew Turner, Nicholas Herrick, David D. Allred, R. Steven Turley, Michael Ware, Justin Peatross

Faculty Publications

We describe an extreme-ultraviolet (EUV) polarimeter that employs laser-generated high-order harmonics as the light source. The polarimeter is designed to characterize materials and thin films for use with EUV light. Laser high harmonics are highly directional with easily rotatable linear polarization, not typically available with other EUV sources. The harmonics have good wavelength coverage, potentially spanning the entire EUV from a few to a hundred nanometers. Our instrument is configured to measure reflectances from 14 to 30 nm and has ~180 spectral resolution (lambda/delta lambda). The reflection from a sample surface can be measured over a continuous range of incident …

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Reexamination Of The Power Spectrum In De Sitter Inflation, Iván Agulló, José Navarro-Salas, Gonzalo J. Olmo, Leonard Parker Oct 2008

Reexamination Of The Power Spectrum In De Sitter Inflation, Iván Agulló, José Navarro-Salas, Gonzalo J. Olmo, Leonard Parker

Faculty Publications

We find that the amplitude of quantum fluctuations of the invariant de Sitter vacuum coincides exactly with that of the vacuum of a comoving observer for a massless scalar (inflaton) field. We propose redefining the actual physical power spectrum as the difference between the amplitudes of the above vacua. An inertial particle detector continues to observe the Gibbons-Hawking temperature. However, although the resulting power spectrum is still scale-free, its amplitude can be drastically reduced since now, instead of the Hubble's scale at the inflationary period, it is determined by the square of the mass of the inflaton fluctuation field. © …

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Using Vagueness Measures To Re-Rank Documents Retrieved By A Fuzzy Set Information Retrieval Model, Stephen Lynn, Yiu-Kai D. Ng Oct 2008

Using Vagueness Measures To Re-Rank Documents Retrieved By A Fuzzy Set Information Retrieval Model, Stephen Lynn, Yiu-Kai D. Ng

Faculty Publications

Traditional information retrieval (IR) systems evaluate user queries and retrieve/rank documents based on matching keywords in user queries with words in documents. These exact word-matching and ranking approaches ignore too many relevant documents that do not contain the exact keywords as specified in a user query. Instead of considering these traditional approaches, we propose to retrieve documents using a fuzzy set IR model and rank retrieved documents for any vague query using the “vagueness score” of the documents based on the word senses as defined in WordNet. Using the vagueness scores, we rank the most highest “relevant” documents of a …

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Calculating Expected Dna Remnants From Ancient Founding Events In Human Population Genetics, Nathan C. Sheffield, Keith A. Crandall, Andrew Stacey Oct 2008

Calculating Expected Dna Remnants From Ancient Founding Events In Human Population Genetics, Nathan C. Sheffield, Keith A. Crandall, Andrew Stacey

Faculty Publications

Background- Recent advancements in sequencing and computational technologies have led to rapid generation and analysis of high quality genetic data. Such genetic data have achieved wide acceptance in studies of historic human population origins and admixture. However, in studies relating to small, recent admixture events, genetic factors such as historic population sizes, genetic drift, and mutation can have pronounced effects on data reliability and utility. To address these issues we conducted genetic simulations targeting influential genetic parameters in admixed populations. Results- We performed a series of simulations, adjusting variable values to assess the affect of these genetic parameters on current …

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Metric Spaces And F S-Domains, Jimmie D. Lawson Oct 2008

Metric Spaces And F S-Domains, Jimmie D. Lawson

Faculty Publications

In this article we give general conditions on a metric space to insure that the poset of closed formal balls is an F S-domain. © 2008 Elsevier B.V. All rights reserved.

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Beauty Photoproduction Using Decays Into Electrons At Hera, S. Chekanov, M. Derrick, S. Magill, B. Musgrave, D. Nicholass, J. Repond, R. Yoshida, Margarita C. K. Mattingly, P. Antonioli, G. Bari, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, F. Cindolo, M. Corradi, G. Iacobucci, A. Margotti, R. Nania, A. Polini, S. Antonelli, M. Basile, M. Bindi, L. Cifarelli, A. Contin, S. De Pasquale, G. Sartorelli, A. Zichichi, D. Bartsch, I. Brock, H. Hartmann Oct 2008

Beauty Photoproduction Using Decays Into Electrons At Hera, S. Chekanov, M. Derrick, S. Magill, B. Musgrave, D. Nicholass, J. Repond, R. Yoshida, Margarita C. K. Mattingly, P. Antonioli, G. Bari, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, F. Cindolo, M. Corradi, G. Iacobucci, A. Margotti, R. Nania, A. Polini, S. Antonelli, M. Basile, M. Bindi, L. Cifarelli, A. Contin, S. De Pasquale, G. Sartorelli, A. Zichichi, D. Bartsch, I. Brock, H. Hartmann

Faculty Publications

Photoproduction of beauty quarks in events with two jets and an electron associated with one of the jets has been studied with the ZEUS detector at HERA using an integrated luminosity of 120pb-1. The fractions of events containing b quarks, and also of events containing c quarks, were extracted from a likelihood fit using variables sensitive to electron identification as well as to semileptonic decays. Total and differential cross sections for beauty and charm production were measured and compared with next-to-leading-order QCD calculations and MonteCarlo models. © 2008 The American Physical Society.

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Embracing Unconscionability’S Safety Net Function, Amy J. Schmitz Oct 2008

Embracing Unconscionability’S Safety Net Function, Amy J. Schmitz

Faculty Publications

Despite courts' and commentators' denial of morality and focus on efficiency in contract law, fairness and flexibility have remained the bedrocks of the unconscionability doctrine. This Article therefore departs from the popular formalist critiques of unconscionability that urge for the doctrine's demise or constraint based on claims that its flexibility and lack of clear definition threaten efficiency in contract law. Contrary to this formalist trend, this Article proposes that unconscionability is necessarily flexible and contextual in order to serve its historical and philosophical function of protecting core human values. Unconscionability is not frivolous gloss on classical contract law. Instead, it …

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The Patent Lottery: Exploiting Behavioral Economics For The Common Good, Dennis D. Crouch Oct 2008

The Patent Lottery: Exploiting Behavioral Economics For The Common Good, Dennis D. Crouch

Faculty Publications

Lotteries are immensely popular. Players are willing to give the organizer a large monetary cut of every ticket purchase in return for a chance at a jackpot. In some ways, our current patent system operates as a lottery as well. Most patents are relatively worthless, while a few are highly valuable. Reaching the major payout of a highly valuable patent takes perseverance in the face of tremendous uncertainty. Like lottery players, small entrepreneurial companies and individuals have shows signs of bounded rationality. In particular, what I call the patent lottery effect is associated with the phenomena of potential innovators overweighting …

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Comparison Of Species Tree Methods For Reconstructing The Phylogeny Of Bearded Manakins (Aves: Pipridae, Manacus) From Multilocus Sequence Data, Robb T. Brumfield, Liang Liu, David E. Lum, Scott V. Edwards Oct 2008

Comparison Of Species Tree Methods For Reconstructing The Phylogeny Of Bearded Manakins (Aves: Pipridae, Manacus) From Multilocus Sequence Data, Robb T. Brumfield, Liang Liu, David E. Lum, Scott V. Edwards

Faculty Publications

Although the power of multi-locus data in estimating species trees is apparent, it is also clear that the analytical methodologies for doing so are still maturing. For example, of the methods currently available for estimating species trees from multiocus data, the Bayesian method introduced by Liu and Pearl (2007; BEST) is the only one that provides nodal support values. Using gene sequences from five nuclear loci, we explored two analytical methods (deep coalescence and BEST) to reconstruct the species tree of the five primary Manacus OTUs: M. aurantiacus, M. candei, M. vitellinus, populations of M. manacus from west of the …

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Rapid Comparison Of Properties On Protein Surface, Lee Sael, David La, Bin Li, Raif Rustamov, Daisuke Kihara Oct 2008

Rapid Comparison Of Properties On Protein Surface, Lee Sael, David La, Bin Li, Raif Rustamov, Daisuke Kihara

Faculty Publications

The mapping of physicochemical characteristics onto the surface of a protein provides crucial insights into its function and evolution. This information can be further used in the characterization and identification of similarities within protein surface regions. We propose a novel method which quantitatively compares global and local properties on the protein surface. We have tested the method on comparison of electrostatic potentials and hydrophobicity. The method is based on 3D Zernike descriptors, which provides a compact representation of a given property defined on a protein surface. Compactness and rotational invariance of this descriptor enable fast comparison suitable for database searches. …

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Mathematics Library News 4, Aaron Lercher Oct 2008

Mathematics Library News 4, Aaron Lercher

Faculty Publications

No abstract provided.

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On Special Pieces, The Springer Correspondence, And Unipotent Characters, Pramod N. Achar, Daniel S. Sage Oct 2008

On Special Pieces, The Springer Correspondence, And Unipotent Characters, Pramod N. Achar, Daniel S. Sage

Faculty Publications

Let G be a connected reductive algebraic group over the algebraic closure of a finite field double-struck F of good characteristic. In this paper, we demonstrate a remarkable compatibility between the Springer correspondence for G and the parametrization of unipotent characters of G(double-struck F ). In particular, we show that in a suitable sense, "large" portions of these two assignments in fact coincide. This extends earlier work of Lusztig on Springer representations within special pieces of the unipotent variety. ©2008 by The Johns Hopkins University Press. q q

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Constructive Characterizations Of 3-Connected Matroids Of Path Width Three, Brian Beavers, James Oxley Oct 2008

Constructive Characterizations Of 3-Connected Matroids Of Path Width Three, Brian Beavers, James Oxley

Faculty Publications

A matroid M is sequential or has path width 3 if M is 3-connected and its ground set has a sequential ordering, that is, an ordering (e1, e2, ..., en) such that ({e1, e2, ..., ek}, {ek + 1, ek + 2, ..., en}) is a 3-separation for all k in {3, 4, ..., n - 3}. This paper proves that every sequential matroid is easily constructible from a uniform matroid of rank or corank two by a sequence of moves each of which consists of a slight modification of segment-cosegment or cosegment-segment exchange. It is also proved that if …

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Nf‐Κb, But Not P38 Map Kinase, Is Required For Tnf‐Α‐Induced Expression Of Cell Adhesion Molecules In Endothelial Cells, Suja Rajan, Jianiming Ye, Shashan Bai, Faqing Huang, Yan-Lin Guo Oct 2008

Nf‐Κb, But Not P38 Map Kinase, Is Required For Tnf‐Α‐Induced Expression Of Cell Adhesion Molecules In Endothelial Cells, Suja Rajan, Jianiming Ye, Shashan Bai, Faqing Huang, Yan-Lin Guo

Faculty Publications

In response to inflammation stimuli, tumor necrosis factor‐α (TNF‐α) induces expression of cell adhesion molecules (CAMs) in endothelial cells (ECs). Studies have suggested that the nuclear factor‐κB (NF‐κB) and the p38 MAP kinase (p38) signaling pathways play central roles in this process, but conflicting results have been reported. The objective of this study is to determine the relative contributions of the two pathways to the effect of TNF‐α. Our initial data indicated that blockade of p38 activity by chemical inhibitor SB203580 (SB) at 10 µM moderately inhibited TNF‐α‐induced expression of three types of CAMs; ICAM‐1, VCAM‐1 and E‐selectin, indicating that …

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An Evaluation Of The Effectiveness Of The Instructional Methods Used With A Student Response System At A Large University, Charles R. Graham, Larry Seawright, Coral Marie Hanson Oct 2008

An Evaluation Of The Effectiveness Of The Instructional Methods Used With A Student Response System At A Large University, Charles R. Graham, Larry Seawright, Coral Marie Hanson

Faculty Publications

This study investigates the adoption of student response systems (SRS) across a large university campus. The study sought to understand how faculty members were using the SRS and what instructional strategies student and faculty found to be most valuable to their learning. The term "helpful" and the concept of "helpfulness" is used in place of "valuable" as it more clearly communicates to students and faculty the concept of how an SRS is of worth to them. Students were generally positive about the helpfulness of the instructional methods professors were using. Students found the ability to receive immediate feedback on their …

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Theory And Application Of Motion Compensation For Lfm-Cw Sar, David G. Long, Evan C. Zaugg Oct 2008

Theory And Application Of Motion Compensation For Lfm-Cw Sar, David G. Long, Evan C. Zaugg

Faculty Publications

Small low-cost high-resolution synthetic aperture radar (SAR) systems are made possible by using a linear frequency-modulated continuous-wave (LFM-CW) signal. SAR processing assumes that the sensor is moving in a straight line at a constant speed, but in actuality, an unmanned aerial vehicle (UAV) or airplane will often significantly deviate from this ideal. This nonideal motion can seriously degrade the SAR image quality. In a continuous-wave system, this motion happens during the radar pulse, which means that existing motion compensation techniques that approximate the position as constant over a pulse are limited for LFM-CW SAR. Small aircraft and UAVs are particularly …

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Scalable Multicast Routing For Ad Hoc Networks, Manoj Pandey, Daniel Zappala Oct 2008

Scalable Multicast Routing For Ad Hoc Networks, Manoj Pandey, Daniel Zappala

Faculty Publications

Routing in a mobile ad hoc network is challenging because nodes can move at any time, invalidating a previously-discovered route. Multicast routing is even more challenging, because a source needs to maintain a route to potentially many group members simultaneously. Providing scalable solutions to this problem typically requires building a hierarchy or an overlay network to reduce the cost of route discovery and maintenance. In this paper, we show that a much simpler alternative is possible, by using source specific semantics and relying on the unicast routing protocol to find all routes. This separation of concerns enables the multicast routing …

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Modeling The Daily Activities Of Breeding Colonial Seabirds: Dynamic Occupancy Patterns In Multiple Habitat Patches, Andrea L. Moore, Smruti P. Damania, Shandelle M. Henson, James L. Hayward Oct 2008

Modeling The Daily Activities Of Breeding Colonial Seabirds: Dynamic Occupancy Patterns In Multiple Habitat Patches, Andrea L. Moore, Smruti P. Damania, Shandelle M. Henson, James L. Hayward

Faculty Publications

We constructed differential equation models for the diurnal abundance and distribution of breeding glaucous-winged gulls (Larus glaucescens) as they moved among nesting and non-nesting habitat patches. We used time scale techniques to reduce the differential equations to algebraic equations and connected the models to field data. The models explained the data as a function of abiotic environmental variables with R2=0.57. A primary goal of this study is to demonstrate the utility of a methodology that can be used by ecologists and wildlife managers to understand and predict daily activity patterns in breeding seabirds.

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Si Cycle In The Cariaco Basin, Venezuela: Seasonal Variability In Silicate Availability And The Si:C:N Composition Of Sinking Particles, Robert Thunell, Claudia R. Benitez-Nelson, Frank Muller-Karger, Laura Lorenzoni, Kent Fanning, Mary Scranton, Ramon Varela, Yrene Astor Oct 2008

Si Cycle In The Cariaco Basin, Venezuela: Seasonal Variability In Silicate Availability And The Si:C:N Composition Of Sinking Particles, Robert Thunell, Claudia R. Benitez-Nelson, Frank Muller-Karger, Laura Lorenzoni, Kent Fanning, Mary Scranton, Ramon Varela, Yrene Astor

Faculty Publications

[1] A 9‐year time series of water column and sediment trap measurements was used to examine silicon cycling within the anoxic Cariaco Basin. The dynamic hydrographic regime within Cariaco Basin results in strong seasonal changes in nutrient availability and the Si:C:N of sinking particles. Upwelling in early winter injects silicic acid (Si(OH)4= ) and nitrate (NO3−) rich waters into the photic zone which stimulates primary production and results in opal fluxes in excess of 4 mmol Si m−2 d−1. However, even during upwelling, surface waters tend to be depleted (μM) in both Si(OH)4= and NO3− as a result …

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Paying Teachers To Earn Advanced Degrees: Evidence On Student Performance In Georgia, Noel D. Campbell, Edward J. Lopez Oct 2008

Paying Teachers To Earn Advanced Degrees: Evidence On Student Performance In Georgia, Noel D. Campbell, Edward J. Lopez

Faculty Publications

No abstract provided.

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Hop-By-Hop Multicast Transport For Mobile Ad Hoc Wireless Networks, Manoj Pandey, Daniel Zappala Oct 2008

Hop-By-Hop Multicast Transport For Mobile Ad Hoc Wireless Networks, Manoj Pandey, Daniel Zappala

Faculty Publications

Multicast transport is a challenging problem because the source must provide congestion control and reliability for a tree, rather than a single path. This problem is made even more difficult in mobile ad hoc networks due to problems caused by contention, spatial reuse, and mobility. In this paper, we design a hop-by-hop multicast transport protocol, which pushes transport functionality into the core of the network. Although this requires per-flow state, a hop-by-hop approach simplifies congestion control, enables local recovery of lost packets, and provides low delay and efficient use of wireless capacity. We use a simulation study to demonstrate the …

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