4,842 research outputs found
HILBERT RINGS ARISING AS PULLBACKS
No full textLet R be the pullback A x(C) B, where B --> C is a surjective homomorphism of commutative rings and A is a subring of C. It is shown that R and C are Hilbert rings if and only if A and B are Hilbert rings. Applications are given to the D + XE[X], D + M, and D + (X1,...,X(n))D(S)[X1,...,X(n)] constructions. For these constructions, new examples are given of Hilbert domains R which are unruly, in the sense that R is non-Noetherian and each of its maximal ideals is finitely generated. Related examples are also given
Elastic-DF: Scaling Performance of DNN Inference in FPGA Clouds through Automatic Partitioning
No full textCustomized compute acceleration in the datacenter is key to the wider roll-out of applications based on deep neural network (DNN) inference. In this article, we investigate how to maximize the performance and scalability of field-programmable gate array (FPGA)-based pipeline dataflow DNN inference accelerators (DFAs) automatically on computing infrastructures consisting of multi-die, network-connected FPGAs. We present Elastic-DF, a novel resource partitioning tool and associated FPGA runtime infrastructure that integrates with the DNN compiler FINN. Elastic-DF allocates FPGA resources to DNN layers and layers to individual FPGA dies to maximize the total performance of the multi-FPGA system. In the resulting Elastic-DF mapping, the accelerator may be instantiated multiple times, and each instance may be segmented across multiple FPGAs transparently, whereby the segments communicate peer-to-peer through 100 Gbps Ethernet FPGA infrastructure, without host involvement. When applied to ResNet-50, Elastic-DF provides a 44% latency decrease on Alveo U280. For MobileNetV1 on Alveo U200 and U280, Elastic-DF enables a 78% throughput increase, eliminating the performance difference between these cards and the larger Alveo U250. Elastic-DF also increases operating frequency in all our experiments, on average by over 20%. Elastic-DF therefore increases performance portability between different sizes of FPGA and increases the critical throughput per cost metric of datacenter inference. Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Computer Engineerin
CATENARITY OF FORMAL POWER-SERIES RINGS OVER A PULLBACK
No full textLet (T, M, K) be a quasilocal domain with maximal ideal M and residue field K, phi: T --> K the natural surjection, and R the pullback phi-1(D), where D is a subring of K. It is shown that R[[X]] is catenarian if and only if T[[X]] and D[[X]] are each catenarian. We also construct a non-Noetherian domain R such that dim(R) > 1 and R[[X1,...,X(n)]] is catenarian for each integer n greater-than-or-equal-to 1. This work leads to the question of determining the field extensions k subset-of K such that Spec(K[[X1,...,X(n)]]) --> Spec(k[[X1,...,X(n)]]) is a homeomorphism for each integer n greater-than-or-equal-to 1. It is shown that any such extension must be purely inseparable; the converse holds if K is a finitely generated extension of k
Dr. Katherine Anderson
No full textDr. Katherine Anderson came to Winston-Salem in 1943 when there were only three private practice pediatricians in the area. She joined the Bowman Gray School of Medicine on a part-time basis for 25 years and in 1968 was appointed to full-time Associate Professor of Pediatrics. During this time, Anderson directed the outpatient services for the Department of Pediatrics and also was supervisor of the newly-developed Physician’s Assistant Program until her retirement in 1976. Dr. Anderson died from cancer on October 20, 1978.Info from biography in exhibit cabinet in Archive
Hydrodynamical turbulence by fractal fourier decimation
No full textWe present a systematic numerical investigation of high-resolution 3D isotropic and homogeneous turbulence resolved on a decimated set of Fourier modes. Fractal decimation acts to decrease the effective dimensionality of the flow by allowing triadic interactions only in a set of Fourier modes N(k) proportional to k^DF for large k. While keeping the symmetries of the original 3D Navier-Stokes equations unchanged, a dramatic change in small-scale statistics is detected at decreasing the fractal dimension DF . Already at fractal dimension DF = 2.8, a global self-similar behaviour is observed in the inertial range of scales, the consequence of such transition are the restoration of the scaling symmetry and vorticity distribution that becomes close to Gaussian. We relate the results to the different roles of local vs non-local interactions in the energy transfer range
'Response by the author, Daniel F. Vukovich.'
No full textResponse by the author (Vukovich) to a review of Illiberal China (my 2019 monograph
"Rowena and Virginia [Obeliss] dressed for Mary's wedding Nov. 18, 1919"
No full textThis photograph of two girls identified only as Rowena and Virginia Obeliss was taken by either Andrew Jackson Farrell or his son Charles Anderson Farrell in their Winston-Salem studio
DF AND HF LASER SPECTRA
No full textW. B. Roh and K. Narahari Rao, J. Mol. Spectrosc. 49, 317 (1974).""Author Institution: Department of Physics, The Ohio State University; Department of Electrical Engineering, The Ohio State UniversityA pulsed laser was used as a source to study DF and HF infrared laser spectra with a grating spectrometer. The rotational structure observed for the 1-0, 2-1, and 3-2 bands of DF, and the 1-0 and 2-1 bands of HF has been measured by following a procedure similar to that used for the CO laser Molecular constants derived by combining these laser measurements with other available data will be presented
OPTOACOUSTIC MEASUREMENT OF DF LASER ABSORPTION BY METHANE
No full textAuthor Institution:An optoacoustic system has been constructed for measurement of absorption of DF laser radiation. Absorption by methane in Argon and Nitrogen has been measured at 15 DF laser lines in the 3.6 – 4.0 region. Construction and calibration of the spectrophone will be discussed
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