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2010

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Articles 1411 - 1440 of 8620

Full-Text Articles in Physical Sciences and Mathematics

Detailed Requirements For Robots In Autism Therapy, Alan Atherton, Bonnie Brinton, Mark Colton, Nicole Giullian, Michael A. Goodrich, Daniel Ricks Oct 2010

Detailed Requirements For Robots In Autism Therapy, Alan Atherton, Bonnie Brinton, Mark Colton, Nicole Giullian, Michael A. Goodrich, Daniel Ricks

Faculty Publications

Robot-based autism therapy is a rapidly developing area of research, with a wide variety of robots being developed for use in clinical settings. Specific, detailed requirements for robots and user interfaces are needed to provide guidelines for the creation of robots that more effectively assist therapists in autism therapy. This paper enumerates a set of requirements for a clinical humanoid robot and the associated human interface. The design of two humanoid robots and an intuitive and flexible user interface for use by therapists in the treatment of children with autism are described.

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Beyond Robot Fan-Out: Towards Multi-Operator Supervisory Control, Michael A. Goodrich, Yisong Guo, Jonathan M. Whetten Oct 2010

Beyond Robot Fan-Out: Towards Multi-Operator Supervisory Control, Michael A. Goodrich, Yisong Guo, Jonathan M. Whetten

Faculty Publications

This paper explores multi-operator supervisory control (MOSC) of multiple independent robots using two complementary approaches: a human factors experiment and an agent-based simulation. The experiment identifies two task and environment limitations on MOSC: task saturation and task diffusion. It also identifies the correlation between task specialization and performance, and the possible existence of untapped spare capacity that emerges when multiple operators coordinate. The presence of untapped spare capacity is explored using agent-based simulation, resulting in evidence which suggests that operators may be more effective when they operate at less than maximum capacity.

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Impact Of Interdisciplinary Undergraduate Research In Mathematics And Biology On The Development Of A New Course Integrating Five Stem Disciplines, Lester Caudill, April L. Hill, Kathy Hoke, Ovidiu Z. Lipan Oct 2010

Impact Of Interdisciplinary Undergraduate Research In Mathematics And Biology On The Development Of A New Course Integrating Five Stem Disciplines, Lester Caudill, April L. Hill, Kathy Hoke, Ovidiu Z. Lipan

Biology Faculty Publications

Funded by innovative programs at the National Science Foundation and the Howard Hughes Medical Institute, University of Richmond faculty in biology, chemistry, mathematics, physics, and computer science teamed up to offer first- and second-year students the opportunity to contribute to vibrant, interdisciplinary research projects. The result was not only good science but also good science that motivated and informed course development. Here, we describe four recent undergraduate research projects involving students and faculty in biology, physics, mathematics, and computer science and how each contributed in significant ways to the conception and implementation of our new Integrated Quantitative Science course, a …

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Flattening Single-Vertex Origami: The Non-Expansive Case, Gaiane Panina, Ileana Streinu Oct 2010

Flattening Single-Vertex Origami: The Non-Expansive Case, Gaiane Panina, Ileana Streinu

Computer Science: Faculty Publications

A single-vertex origami is a piece of paper with straight-line rays called creases emanating from a fold vertex placed in its interior or on its boundary. The Single-Vertex Origami Flattening problem asks whether it is always possible to reconfigure the creased paper from any configuration compatible with the metric, to a flat, non-overlapping position, in such a way that the paper is not torn, stretched and, for rigid origami, not bent anywhere except along the given creases. Streinu and Whiteley showed how to reduce the problem to the carpenter's rule problem for spherical polygons. Using spherical expansive motions, they solved …

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A Tremor And Slip Event On The Cocos‐Caribbean Subduction Zone As Measured By A Global Positioning System (Gps) And Seismic Network On The Nicoya Peninsula, Costa Rica, Kimberly Outerbridge, Timothy H. Dixon, Susan Y. Schwartz, Jacob I. Walter, Marino Protti, Victor Gonzalez, J. Biggs, Martin Thorwart, Wolfgang Rabbel Oct 2010

A Tremor And Slip Event On The Cocos‐Caribbean Subduction Zone As Measured By A Global Positioning System (Gps) And Seismic Network On The Nicoya Peninsula, Costa Rica, Kimberly Outerbridge, Timothy H. Dixon, Susan Y. Schwartz, Jacob I. Walter, Marino Protti, Victor Gonzalez, J. Biggs, Martin Thorwart, Wolfgang Rabbel

School of Geosciences Faculty and Staff Publications

In May 2007 a network of global positioning systems (GPS) and seismic stations on the Nicoya Peninsula, of northern Costa Rica, recorded a slow-slip event accompanied by seismic tremor. The close proximity of the Nicoya Peninsula to the seismogenic part of the Cocos-Caribbean subduction plate boundary makes it a good location to study such events. Several centimeters of southwest motion were recorded by the GPS stations over a period of several days to several weeks, and the seismic stations recorded three distinct episodes of tremor during the same time span. Inversion of the surface displacement data for the depth and …

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Mining Collaboration Patterns From A Large Developer Network, Didi Surian, David Lo, Ee Peng Lim Oct 2010

Mining Collaboration Patterns From A Large Developer Network, Didi Surian, David Lo, Ee Peng Lim

Research Collection School Of Computing and Information Systems

In this study, we extract patterns from a large developer collaborations network extracted from Source Forge. Net at high and low level of details. At the high level of details, we extract various network-level statistics from the network. At the low level of details, we extract topological sub-graph patterns that are frequently seen among collaborating developers. Extracting sub graph patterns from large graphs is a hard NP-complete problem. To address this challenge, we employ a novel combination of graph mining and graph matching by leveraging network-level properties of a developer network. With the approach, we successfully analyze a snapshot of …

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Refinement Of Biomarker Pentosidine Methodology For Use On Aging Birds, Crissa K. Cooey, Jesse A. Fallon, Michael L. Avery, James T. Anderson, Elizabeth A. Falkenstein, Hillar Klandorf Oct 2010

Refinement Of Biomarker Pentosidine Methodology For Use On Aging Birds, Crissa K. Cooey, Jesse A. Fallon, Michael L. Avery, James T. Anderson, Elizabeth A. Falkenstein, Hillar Klandorf

United States Department of Agriculture Wildlife Services: Staff Publications

There is no reliable method for determining age for most species of long-lived birds. Recent success using the skin chemical pentosidine as a biomarker has shown promise as an aging tool for birds. Pentosidine levels have been determined only from the breast tissue of carcasses, and we sought to refine the procedure with respect to biopsy size and location for safe and effective use on living birds. We compared pentosidine concentrations in 4 skin-size samples (4, 6, 8, and 20-mm diameter biopsies) from the breast of black vulture (Coragyps atratus) carcasses. We also compared pentosidine levels from breast …

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Evaluation Of Rhodamine B As A Biomarker For Raccoons, Tricia L. Fry, Todd C. Atwood, Mike R. Dunbar Oct 2010

Evaluation Of Rhodamine B As A Biomarker For Raccoons, Tricia L. Fry, Todd C. Atwood, Mike R. Dunbar

United States Department of Agriculture Wildlife Services: Staff Publications

The USDA/APHIS/Wildlife Services (WS) oral rabies vaccination program uses tetracycline, a broad-spectrum antibiotic and relatively reliable biomarker, to quantify vaccinebait uptake by raccoons (Procyon lotor). However, obtaining samples (e.g., bone or teeth) to assess tetracycline uptake is highly invasive, and sample preparation can be expensive. By contrast, rhodamine B, a commercially available dye, is absorbed systemically in growing tissues, including hair and whiskers, and can be observed under ultraviolet (UV) light as fluorescent orange bands. Our goal was to evaluate whether rhodamine B can be used as a biomarker to monitor bait uptake by raccoons. We began by …

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Geospatial Data Portals: Librarians Add Expertise In The Development Of Gis Metadata Catalogs, Adonna Fleming Oct 2010

Geospatial Data Portals: Librarians Add Expertise In The Development Of Gis Metadata Catalogs, Adonna Fleming

UNL Libraries: Faculty Publications

Searching a geospatial data catalog can be frustrating for many GIS data users. Geospatial data catalogs are built on records created to a specific metadata standard, such as ISO 19115. The search query is often limited to searching a few tags within the record, such as title, publisher, spatial extent, content theme, and content type. GIS personnel tend to create metadata records with little thought into how it will be discovered by others. On the other hand, library catalogs are developed for a broad spectrum of users with varying knowledge of the subject. Librarians can bring this expertise in creating …

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A Multi-Phase Suzaku Study Of Τ Sco., Richard Ignace, L. Oskinova, M. Jardine, J. Cassinelli, D. Cohen, J.-F. Donati, R. Townsend, A. Ud-Doula Oct 2010

A Multi-Phase Suzaku Study Of Τ Sco., Richard Ignace, L. Oskinova, M. Jardine, J. Cassinelli, D. Cohen, J.-F. Donati, R. Townsend, A. Ud-Doula

ETSU Faculty Works

We obtained relatively high signal-to-noise X-ray spectral data of the early massive star τ Sco (B0.2V) with the Suzaku X-ray Imaging Spectrometer (XIS) instrument. This source displays several unusual features that motivated our study: (1) redshifted absorption in UV P Cygni lines to approximately +250 km s−1 suggestive of infalling gas, (2) unusually hard X-ray emission requiring hot plasma at temperatures in excess of 10 MK whereas most massive stars show relatively soft X-rays at a few MK, and (3) a complex photospheric magnetic field of open and closed field lines. In an attempt to understand the hard component better, …

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A Three-Year Study Of The Magnetic Field Fluctuations In The Magnetospheric Cusp, Christina Seiman Chu Oct 2010

A Three-Year Study Of The Magnetic Field Fluctuations In The Magnetospheric Cusp, Christina Seiman Chu

Master's Theses - Daytona Beach

The high-altitude magnetospheric cusps are regions of significant magnetic field turbulence. There are also magnetic field fluctuations that cannot be called turbulence. Some of the low frequency fluctuations observed in the cusp have been shown to be motion of the cusp structure by the spacecraft (back and forth motion of the boundaries surrounding the cusp); others are transient reconnection signatures or flux transfer events (FTEs). Turbulence is important to understand because it has been proposed as a mechanism for particle energization in the cusps to MeV levels. High resolution magnetic field data from the Fluxgate Magnetometer instruments on the Cluster …

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Trace Metal Concentrations Across Trophic Levels In Cotton Fields Of Xinjiang Province, China, Jessica Quinn Oct 2010

Trace Metal Concentrations Across Trophic Levels In Cotton Fields Of Xinjiang Province, China, Jessica Quinn

All Student Theses and Dissertations

Trace metals become concentrated in urban and peri-urban soils with the use of agricultural practices and industrial emissions. Fertilizers, liming, sewage sludge, and irrigation water contain metals which accumulate in agricultural fields and pose a risk to humans and wildlife. Coal plants and brickyards release metals into the atmosphere which are deposited on soil and plant surfaces. This research quantifies the concentrations of nine trace metals in three different soil types. A total of 116 rodents were sampled in cotton fields and a desert. Cotton plants and triplicate soil samples were collected with each rodent capture. Soil samples were analyzed …

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Secureangle: Improving Wireless Security Using Angle-Of-Arrival Information, Jie Xiong, Kyle Jamieson Oct 2010

Secureangle: Improving Wireless Security Using Angle-Of-Arrival Information, Jie Xiong, Kyle Jamieson

Research Collection School Of Computing and Information Systems

Wireless networks play an important role in our everyday lives, at the workplace and at home. However, they are also relatively vulnerable: physically located off site, attackers can circumvent wireless security protocols such as WEP, WPA, and even to some extent WPA2, presenting a security risk to the entire network. To address this problem, we propose SecureAngle, a system designed to operate alongside existing wireless security protocols, adding defense in depth. SecureAngle leverages multi-antenna APs to profile the directions at which a client's signal arrives, using this angle-of-arrival (AoA) information to construct signatures that uniquely identify each client. We identify …

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Attracting The Community's Many Eyes: An Exploration Of User Involvement In Issue Tracking, Lars Grammel, Holger Schackmann, Adrian Schröter, Christoph Treude, Margaret-Anne Storey Oct 2010

Attracting The Community's Many Eyes: An Exploration Of User Involvement In Issue Tracking, Lars Grammel, Holger Schackmann, Adrian Schröter, Christoph Treude, Margaret-Anne Storey

Research Collection School Of Computing and Information Systems

A community of users who report bugs and request features provides valuable feedback that can be used in product development. We compare the community involvement in issue tracker usage between the open source project Eclipse and the closed source project IBM Jazz to evaluate if publicly accessible issue trackers work as well in closed source projects. We find that IBM Jazz successfully receives user feedback through this channel. We then explore the differences in work item processing in IBM Jazz between team members, project members and externals. We conclude that making public issue trackers available in closed source projects is …

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Phosphorus Uptake In Rhodomonas Salina (Wislouch) And Its Effect On Allocation And Elimination In Acartia Tonsa (Dana), Danna Palladino Oct 2010

Phosphorus Uptake In Rhodomonas Salina (Wislouch) And Its Effect On Allocation And Elimination In Acartia Tonsa (Dana), Danna Palladino

OES Theses and Dissertations

Phosphorus is a key element in important biochemical compounds, such as RNA and phospholipids, and can become limiting in a variety of marine systems. The uptake of phosphorus into biochemical fractions (protein, low molecular weight (LMW) compounds, lipid, polysaccharide and nucleic acid) in Acartia tonsa fed 33P -labeled Rhodomonas salina was examined. R. salina was cultured on two variations of one media that in one case contained phosphorus in balance and the other out of balance with relation to other standard f/2 components. The P-balanced (PB) media had a N:P ratio of 24.5, which is higher than that found …

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Characterization Of Metastasis-Associated Cell Surface Glycoproteins In Prostate Cancer, Lifang Yang Oct 2010

Characterization Of Metastasis-Associated Cell Surface Glycoproteins In Prostate Cancer, Lifang Yang

Theses and Dissertations in Biomedical Sciences

Prostate cancer (PCa) is a major health problem in males in the United States. Its lethality is mostly attributed to the primary tumor metastasizing to distant sites that are highly resistant to conventional therapies. Serum Prostate Specific Antigen (PSA) is the only protein biomarker used in clinic for prediction of prostate cancer recurrence following local therapies. Nonetheless, PSA lacks the ability to predict the behavior of an individual tumor in an individual patient. Therefore, development of reliable biomarkers for detection of metastatic potential in primary tumors, as well as discovery of new therapeutic targets, is in a great need for …

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Comparison Of Ice Core Dissolved Organic Matter From A Greenland Ice Core By Nanospray Fourier Transform Ion Cyclotron Resonance Mass Spectrometry, Joshua Jeremiah Shiloh Marsh Oct 2010

Comparison Of Ice Core Dissolved Organic Matter From A Greenland Ice Core By Nanospray Fourier Transform Ion Cyclotron Resonance Mass Spectrometry, Joshua Jeremiah Shiloh Marsh

Chemistry & Biochemistry Theses & Dissertations

Recent studies of ice cores have embarked on the task of determining the classes of dissolved organic matter (DOM) present in melt-water from the cores collected in numerous locations in the northern and southern hemispheres. This DOM originally derives from wet precipitation and is thought to reflect atmospheric organic matter derived from anthropogenic and non-anthropogenic sources. Because the amount of DOM is so low, previous studies have necessarily used large sample volumes (greater than 500 mL) to concentrate sufficient ice core DOM necessary for mass spectral analysis. Solid phase extraction (SPE) with C18 resins was followed by evaporative concentration …

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Derelict Crab Pots In The Chesapeake Bay, Center For Coastal Resources Management, Virginia Institute Of Marine Science Oct 2010

Derelict Crab Pots In The Chesapeake Bay, Center For Coastal Resources Management, Virginia Institute Of Marine Science

Reports

Rivers & Coast is a periodic publication of the Center for Coastal Resources Management, Virginia Institute of Marine Science. The goal of Rivers & Coast is to keep readers well informed of current scientific understanding behind key environmental issues related to watershed rivers and coastal ecosystems of the Chesapeake Bay.

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R/V Thompson Em302 Sat -- Cruise Report, Jonathan Beaudoin, Val E. Schmidt Oct 2010

R/V Thompson Em302 Sat -- Cruise Report, Jonathan Beaudoin, Val E. Schmidt

Center for Coastal and Ocean Mapping

No abstract provided.

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Correction Of Bathymetric Survey Artifacts Resulting From Apparent Wave-Induced Vertical Position Of An Auv, Val E. Schmidt, Nicole A. Raineault, Adam Skarke, Arthur Trembanis, Larry A. Mayer Oct 2010

Correction Of Bathymetric Survey Artifacts Resulting From Apparent Wave-Induced Vertical Position Of An Auv, Val E. Schmidt, Nicole A. Raineault, Adam Skarke, Arthur Trembanis, Larry A. Mayer

Center for Coastal and Ocean Mapping

Recent increases in the capability and reliability of autonomous underwater vehicles (AUVs) have provided the opportunity to conduct bathymetric seafloor surveys in shallow water (< 50 m). Unfortunately, surveys of this water depth may contain artifacts induced by large amplitude wave motion at the surface. The artifacts occur when an onboard pressure sensor determines the depth of the AUV. Waves overhead induce small pressure fluctuations at depth, which modulate the AUV’s pressure sensor output without causing actual vertical movement of the AUV. Since bathymetric measurements are made with respect to the AUV’s depth, these pressure fluctuations, in turn, modulate the measurement of the seafloor. The result is a periodic across-track, vertical offset of the seafloor profile (similar to a heave artifact sometimes common in surface vessel surveys). In this paper we describe our experience with the “Gavia” model AUV (Hafmynd EHF, Iceland) in a recent bathymetric survey during which wave action overhead induced such an artifact with a peak-to-peak amplitude as large as 1 meter. A method for removing the artifact as well as recommendations for modifications to the sonar, INS and AUV to mitigate the effect in the future are provided.

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Acquisizione Magnetica Marina Dell'alto Strutturale Del Mt. Vercelli (Mar Tirreno Centrale) E Del Golfo Di Napoli: Descrizione Dei Rilievi E Primi Risultati, L. Cocchi, F. Muccini, C. Carmisciano, R. Vagni, Giuseppe Masetti Oct 2010

Acquisizione Magnetica Marina Dell'alto Strutturale Del Mt. Vercelli (Mar Tirreno Centrale) E Del Golfo Di Napoli: Descrizione Dei Rilievi E Primi Risultati, L. Cocchi, F. Muccini, C. Carmisciano, R. Vagni, Giuseppe Masetti

Center for Coastal and Ocean Mapping

Durante la Campagna Oceanografica Ver2010, effettuata nel mese di maggio 2010, sono stati acquisiti due set di dati geomagnetici marini in alta risoluzione relativi alle aree del Mt. Vercelli (Mar Tirreno Centrale) e del Golfo di Napoli. Tale attività di misura è stata resa possibile grazie alla collaborazione tecnica scientifica tra l’Unità di Progetto “Geofisica e Tecnologie Marine” dell’Istituto Nazionale di Geofisica e Vulcanologia (INGV) e l’Istituto Idrografico della Marina (IIM). La proficua collaborazione è sancita dall’accordo di cooperazione “Co.Na.Ge.M” (Coordinamento Nazionale per la Geofisica Marina). Nello specifico, i due rilievi sono stati svolti mediante l’impiego della Nave Idro-oceanografica “Aretusa”, …

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Real-Time Monitoring Of Uncertainty Due To Refraction In Multibeam Echo Sounding, Jonathan Beaudoin Oct 2010

Real-Time Monitoring Of Uncertainty Due To Refraction In Multibeam Echo Sounding, Jonathan Beaudoin

Center for Coastal and Ocean Mapping

A software toolkit has been developed to objectively monitor uncertainty due to refraction in multibeam echosounding, specifically mapping systems that employ underway sound speed profiling hardware. The toolkit relies on the use of a raytrace simulator which mimics the sounding geometry of any given echosounder, specifically array type, angular sector, draft, and availability of a surface sound speed probe. The simulator works by objectively comparing a pair of consecutively collected sound speed profiles and reporting sounding uncertainty across the entire potential sounding space. Realtime visualizations of the uncertainty as a function of time and space allow the operator to tune …

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Coxeter Groups And Asynchronous Cellular Automata, Matthew Macauley, Henning S. Mortveit Oct 2010

Coxeter Groups And Asynchronous Cellular Automata, Matthew Macauley, Henning S. Mortveit

Publications

The dynamics group of an asynchronous cellular automaton (ACA) relates properties of its long term dynamics to the structure of Coxeter groups. The key mathematical feature connecting these diverse fields is involutions. Group-theoretic results in the latter domain may lead to insight about the dynamics in the former, and vice-versa. In this article, we highlight some central themes and common structures, and discuss novel approaches to some open and open-ended problems. We introduce the state automaton of an ACA, and show how the root automaton of a Coxeter group is essentially part of the state automaton of a related ACA.

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Development Of Agroecology Based Garden System And Educational Program At Grand Valley State University, Kendall Gilbert, Edwin Joseph Oct 2010

Development Of Agroecology Based Garden System And Educational Program At Grand Valley State University, Kendall Gilbert, Edwin Joseph

Student Summer Scholars Manuscripts

This study was part of a twelve- week project to introduce agroecology growing principles and educational models at the Community Garden on the campus of Grand Valley State University in Allendale, Michigan. This project was set up to be a demonstration for the further development of the garden space as an area for agroecology focused education, extension, and outreach. To accomplish this, three areas of change became essential components to developing a garden space that can serve as a living laboratory, demonstration area, and outdoor classroom. The first project goal was to develop and create a demonstration garden plot that …

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กิจกรรมการแถลงข่าว Oct 2010

กิจกรรมการแถลงข่าว

Thai Environment

No abstract provided.

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สรุปสถานการณ์น้ำท่วม Oct 2010

สรุปสถานการณ์น้ำท่วม

Thai Environment

No abstract provided.

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วิกฤตน้ำท่วมประเทศไทย...แค่ไหน ปัญหา ทางออก, สถาบันวิจัยสภาวะแวดล้อม, จุฬาลงกรณ์มหาวิทยาลัย Oct 2010

วิกฤตน้ำท่วมประเทศไทย...แค่ไหน ปัญหา ทางออก, สถาบันวิจัยสภาวะแวดล้อม, จุฬาลงกรณ์มหาวิทยาลัย

Thai Environment

No abstract provided.

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ฝายชะลอน้ำ กับการป้องกันน้ำท่วม, ทวีวงศ์ ศรีบุรี Oct 2010

ฝายชะลอน้ำ กับการป้องกันน้ำท่วม, ทวีวงศ์ ศรีบุรี

Thai Environment

No abstract provided.

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วิกฤตน้ำท่วมประเทศไทย : บทเรียนและแนวทางอนาคต, สถาบันวิจัยสภาวะแวดล้อม, จุฬาลงกรณ์มหาวิทยาลัย Oct 2010

วิกฤตน้ำท่วมประเทศไทย : บทเรียนและแนวทางอนาคต, สถาบันวิจัยสภาวะแวดล้อม, จุฬาลงกรณ์มหาวิทยาลัย

Thai Environment

No abstract provided.

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Spatiotemporal Two-Dimensional Solitons In The Complex Ginzburg-Landau Equation, Florent Berard, S.C. Mancas Oct 2010

Spatiotemporal Two-Dimensional Solitons In The Complex Ginzburg-Landau Equation, Florent Berard, S.C. Mancas

Publications

We introduce spatiotemporal solitons of the two-dimensional complex Ginzburg-Landau equation (2D CCQGLE) with cubic and quintic nonlinearities in which asymmetry between space-time variables is included. The 2D CCQGLE is solved by a powerful Fourier spectral method, i.e., a Fourier spatial discretization and an explicit scheme for time differencing. Varying the system's parameters, and using different initial conditions, numerical simulations reveal 2D solitons in the form of stationary, pulsating and exploding solitons which possess very distinctive properties. For certain regions of parameters, we have also found stable coherent structures in the form of spinning (vortex) solitons which exist as a result …

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