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280 results on '"Schaefer, Scott"'

252. Positive Gordon–Wixom coordinates

Author

Manson, Josiah, Li, Kuiyu, and Schaefer, Scott

Subjects
*COORDINATES, *GEOMETRICAL constructions, *GEOMETRIC shapes, *INTERPOLATION, *NUMERICAL analysis, *POLYGONS, *COMPUTER-aided design, *MATHEMATICAL functions
Abstract

Abstract: We introduce a new construction of transfinite barycentric coordinates for arbitrary closed sets in two dimensions. Our method extends weighted Gordon–Wixom interpolation to non-convex shapes and produces coordinates that are positive everywhere in the interior of the domain and that are smooth for shapes with smooth boundaries. We achieve these properties by using the distance to lines tangent to the boundary curve to define a weight function that is positive and smooth. We derive closed-form expressions for arbitrary polygons in two dimensions and compare the basis functions of our coordinates with several other types of barycentric coordinates. [Copyright &y& Elsevier]

Published
2011
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253. Implications of SARS‐CoV‐2 on current and future operation and management of wastewater systems.

Author

Maal‐Bared, Rasha, Brisolara, Kari, Munakata, Naoko, Bibby, Kyle, Gerba, Charles, Sobsey, Mark, Schaefer, Scott, Swift, Jay, Gary, Lee, Sherchan, Samendra, Babatola, Akin, Bastian, Robert, Olabode, Lola, Reimers, Robert, and Rubin, Albert

Subjects
*SEWAGE purification, *SARS-CoV-2, *OPERATIONS management, *MICROBIOLOGICAL aerosols, *WATER utilities, *FECAL contamination
Abstract

While researchers have acknowledged the potential role of environmental scientists, engineers, and industrial hygienists during this pandemic, the role of the water utility professional is often overlooked. The wastewater sector is critical to public health protection and employs collection and treatment system workers who perform tasks with high potential for exposures to biological agents. While various technical guidances and reports have initially provided direction to the water sector, the rapidly growing body of research publications necessitates the constant review of these papers and data synthesis. This paper presents the latest findings and highlights their implications from a water and wastewater utility operation and management perspective. Practitioner points: Extrapolation from SARS‐CoV‐1 and MERS‐CoV, as well as other surrogates, has helped predicting SARS‐CoV‐2 behavior and risk management.Data from treated wastewater effluent suggest that current processes are sufficient for SARS‐CoV‐2 control.Scientific evidence supports the possibility of fecal–oral transmission for SARS‐CoV‐2.Limited evidence supports the potential survival of infective SARS‐CoV‐2 on surfaces and in aerosols and the efficacy of control measures at reducing transmission.Protective practices and PPE can protect workers from SARS‐CoV‐2 and other pathogens found in wastewater. [ABSTRACT FROM AUTHOR]

Published
2021
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254. New Biological Books: Zoological sciences.

Author

Schaefer, Scott A.

Subjects
*ZOOLOGY
Abstract

Reviews the books `Systematics and Biogeography of Cephalods,' vols. 1-2, edited by Nancy A. Voss, Michael Vecchione, Ronald B. Toll and Michael B. Sweeney and `Collection Building in Ichthyology and Herpetology,' edited by Theodore W. Pietsch and William D. Anderson, Jr.

Published
1999

256. Non-manifold Medial Surface Reconstruction from Volumetric Data

Author

Michikawa, Takashi, Suzuki, Hiromasa, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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257. A Subdivision Approach to Planar Semi-algebraic Sets

Author

Mantzaflaris, Angelos, Mourrain, Bernard, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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258. Support Function of Pythagorean Hodograph Cubics and G 1 Hermite Interpolation

Author

Černohorská, Eva, Šír, Zbynek, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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259. Constraints on Curve Networks Suitable for G 2 Interpolation

Author

Hermann, Thomas, Peters, Jorg, Strotman, Tim, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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260. Computing the Distance between Canal Surfaces

Author

Ma, Yanpeng, Tu, Changhe, Wang, Wenping, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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261. Piecewise Tri-linear Contouring for Multi-material Volumes

Author

Feng, Powei, Ju, Tao, Warren, Joe, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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262. An Efficient Algorithm for the Sign Condition Problem in the Semi-algebraic Context

Author

Grimson, Rafael, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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263. Eigenmodes of Surface Energies for Shape Analysis

Author

Hildebrandt, Klaus, Schulz, Christian, von Tycowicz, Christoph, Polthier, Konrad, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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264. Surfaces with Rational Chord Length Parameterization

Author

Bastl, Bohumír, Jüttler, Bert, Lávička, Miroslav, Šír, Zbyněk, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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265. Selecting Knots Locally for Curve Interpolation with Quadratic Precision

Author

Caiming, Zhang, Wenping, Wang, Jiaye, Wang, Xuemei, Li, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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266. Optimal Analysis-Aware Parameterization of Computational Domain in Isogeometric Analysis

Author

Xu, Gang, Mourrain, Bernard, Duvigneau, Régis, Galligo, André, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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267. Global Solutions of Well-Constrained Transcendental Systems Using Expression Trees and a Single Solution Test

Author

Aizenshtein, Maxim, Bartoň, Michael, Elber, Gershon, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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268. Efficient Computation of 3D Clipped Voronoi Diagram

Author

Yan, Dong-Ming, Wang, Wenping, Lévy, Bruno, Liu, Yang, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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269. Construction of Minimal Catmull-Clark’s Subdivision Surfaces with Given Boundaries

Author

Pan, Qing, Xu, Guoliang, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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270. Construction of Subdivision Surfaces by Fourth-Order Geometric Flows with G 1 Boundary Conditions

Author

Xu, Guoliang, Pan, Qing, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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271. Parameterization of Star-Shaped Volumes Using Green’s Functions

Author

Xia, Jiazhi, He, Ying, Han, Shuchu, Fu, Chi-Wing, Luo, Feng, Gu, Xianfeng, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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272. Efficient Point Projection to Freeform Curves and Surfaces

Author

Oh, Young-Taek, Kim, Yong-Joon, Lee, Jieun, Kim, Myung-Soo, Elber, Gershon, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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273. G 1 Bézier Surface Generation from Given Boundary Curve Network with T-Junction

Author

Oh, Min-jae, Park, Sung Ha, Kim, Tae-wan, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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274. Automatic Generation of Riemann Surface Meshes

Author

Nieser, Matthias, Poelke, Konstantin, Polthier, Konrad, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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275. Decomposing Scanned Assembly Meshes Based on Periodicity Recognition and Its Application to Kinematic Simulation Modeling

Author

Mizoguchi, Tomohiro, Kanai, Satoshi, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Mourrain, Bernard, editor, Schaefer, Scott, editor, and Xu, Guoliang, editor

Published
2010
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277. Low Rank Matrix Approximation for 3D Geometry Filtering.

Author

Lu X, Schaefer S, Luo J, Ma L, and He Y

Abstract

We propose a robust normal estimation method for both point clouds and meshes using a low rank matrix approximation algorithm. First, we compute a local isotropic structure for each point and find its similar, non-local structures that we organize into a matrix. We then show that a low rank matrix approximation algorithm can robustly estimate normals for both point clouds and meshes. Furthermore, we provide a new filtering method for point cloud data to smooth the position data to fit the estimated normals. We show the applications of our method to point cloud filtering, point set upsampling, surface reconstruction, mesh denoising, and geometric texture removal. Our experiments show that our method generally achieves better results than existing methods.

Published
2022
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278. Image Structure Retrieval via Minimization.

Author

Sun Y, Schaefer S, and Wang W

Abstract

Retrieving salient structure from textured images is an important but difficult problem in computer vision because texture, which can be irregular, anisotropic, non-uniform and complex, shares many of the same properties as structure. Observing that salient structure in a textured image should be piece-wise smooth, we present a method to retrieve such structures using an minimization of a modified form of the relative total variation metric. Thanks to the characteristics shared by texture and small structures, our method is effective at retrieving structure based on scale as well. Our method outperforms state-of-art methods in texture removal as well as scale-space filtering. We also demonstrate our method's ability in other applications such as edge detection, clip art compression artifact removal, and inverse half-toning.

Published
2018
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279. Retooling the ethanol industry: thermophilic anaerobic digestion of thin stillage for methane production and pollution prevention.

Author

Schaefer SH and Sung S

Subjects
Anaerobiosis, Biodegradation, Environmental, Hydrogen-Ion Concentration, Temperature, Time Factors, Ultrasonics, Zea mays, Bioreactors, Digestion, Environmental Pollution prevention & control, Ethanol metabolism, Fatty Acids, Volatile metabolism, Methane metabolism
Abstract

Anaerobic digestion of corn ethanol thin stillage was tested at thermophilic temperature (55 degrees C) with two completely stirred tank reactors. The thin stillage wastestream was organically concentrated with 100 g/L total chemical oxygen demand and 60 g/L volatiles solids and a low pH of approximately 4.0. Steady-state was achieved at 30-, 20-, and 15-day hydraulic retention times (HRTs) and digester failure at a 12-day HRT. Significant reduction of volatile solids was achieved, with a maximum reduction (89.8%) at the 20-day HRT. Methane yield ranged from 0.6 to 0.7 L methane/g volatile solids removed during steady-state operation. Effluent volatile fatty acids below 200 mg/L as acetic acid were achieved at 20- and 30-day HRTs. Ultrasonic pretreatment was used for one digester, although no significant improvement was observed. Ethanol plant natural gas consumption could be reduced 43 to 59% with the methane produced, while saving an estimated $7 to $17 million ($10 million likely) for a facility producing 360 million L ethanol/y.

Published
2008
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280. Enhanced resistance to early blight in transgenic tomato lines expressing heterologous plant defense genes.

Author

Schaefer SC, Gasic K, Cammue B, Broekaert W, van Damme EJ, Peumans WJ, and Korban SS

Subjects
Agrobacterium tumefaciens genetics, Alternaria pathogenicity, Gene Expression, Glycoside Hydrolases genetics, Iris Plant genetics, Solanum lycopersicum microbiology, Mirabilis genetics, N-Glycosyl Hydrolases genetics, Plant Proteins genetics, Plants, Genetically Modified, Ribosome Inactivating Proteins, Type 1, Transformation, Genetic, Zea mays enzymology, Zea mays genetics, Genes, Plant, Solanum lycopersicum genetics, Plant Diseases genetics
Abstract

Genes coding for an iris ribosomal-inactivating protein (I-RIP), a maize beta-glucanase (M-GLU), and a Mirabilis jalapa antimicrobial peptide (Mj-AMP1) were separately introduced into tomato (Lycopersicon esculentum cv. Sweet Chelsea) cotyledons via Agrobacterium tumefaciens-mediated transformation. Transgenic lines carrying each of the transgenes were confirmed for integration into the tomato genome using Southern blot hybridization. Transcription of I-RIP, M-GLU, and Mj-AMP1 genes in various transgenic lines was determined using Northern blot analysis. Plants of selected transgenic lines were inoculated with a 2-3x10(4) conidial spores/ml suspension of the fungal pathogen Alternaria solani, the causal agent of tomato early blight. Compared to control (non-transformed) plants, two transgenic lines carrying either a M-GLU or Mj-AMP1 showed enhanced resistance to early blight disease. None of the four lines carrying the I-RIP transgene showed increased resistance to early blight.

Published
2005
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