3,401 research outputs found
M. H. Huffman, seated, resident engineer from Denison district, and his chief clerk, B. T. Howell, standing
No full textM. H. Huffman, seated, resident engineer from Denison district, and his chief clerk, B. T. Howell, standing.https://mavmatrix.uta.edu/specialcollections_startelegram1940s/14536/thumbnail.jp
Long-Run Structural and Productivity Change in U.S. Agriculture: Effects of Prices and Policies
No full textLong-Run Structural and Productivity Change in U.S. Agriculture: Effects of Prices and Policies by Wallace E. Huffman and Robert E. Evenson The paper presents (1) a conceptual framework for structural change when farms may be multiproduct or specialized and (2) an econometrics examination of causes of structural and total factor productivity (TFP) change for U.S. agriculture. Farm size, farm specialization, and part-time farming are the structural dimension emphasized, and they become potential channels to TFP change. Using state aggregate data starting in 1950, we conclude that input prices, public and private research, public extension, and government commodity programs have directly and indirectly caused change in U.S. farm structure and TFP. Our results suggest that changes in farm size, however, have been dominated by input price changes rather than by technology or government programs.farm structure, productivity, farm size, farm specialization, part-time farming, research, technical change, agriculture
ANALISIS PENGARUH KOMPRESI TEKS HUFFMAN DAN METODE PENYISIPAN LSB TERHADAP NILAI PSNR DALAM STEGANOGRAFI
No full textSteganografi merupakan seni dan teknik menyembunyikan informasi menggunakan media lain sebagai tempat penyimpanan. Pada penelitian ini digunakan teknik penyisipan LSB ( Last Significant Bit) untuk menyisipkan informasi rahasia dengan format teks ke-dalam citra digital dengan format bitmap (*.bmp) sebagai tempat penyimpanan. Terdapat dua buah metode yang akan dilakukan dalam penelitian ini. Penelitian A merupakan steganografi yang menyisipkan teks tanpa kompresi Huffman ke-dalam citra digital dan penelitian B merupakan steganografi yang menyisipkan teks terkompresi Huffman ke-dalam citra digital. Untuk mengukur kualitas citra hasil antara penelitian A dan B digunakan teknik pengukuran secara kuantitatif menggunakan besaran PSNR. Untuk mengetahui pengaruh kompresi teks terhadap hasil PSNR dalam steganografi, dilakukan pengujian secara statistik yaitu paired T Test yang akan membandingkan nilai PSNR dari penelitian A dan B. Dari penelitian yang telah dilakukan, didapatkan hasil statistik yang menunjukkan bahwa H0 ditolak dan H1 diterima. Sehingga dapat disimpulkan bahwa kompresi huffman teks dalam steganografi berpengaruh terhadap nilai PSNR
ANALISIS PENGARUH KOMPRESI TEKS HUFFMAN DAN METODE PENYISIPAN LSB TERHADAP NILAI PSNR DALAM STEGANOGRAFI
No full textSteganografi merupakan seni dan teknik menyembunyikan informasi menggunakan media lain sebagai tempat penyimpanan. Pada penelitian ini digunakan teknik penyisipan LSB ( Last Significant Bit) untuk menyisipkan informasi rahasia dengan format teks ke-dalam citra digital dengan format bitmap (*.bmp) sebagai tempat penyimpanan. Terdapat dua buah metode yang akan dilakukan dalam penelitian ini. Penelitian A merupakan steganografi yang menyisipkan teks tanpa kompresi Huffman ke-dalam citra digital dan penelitian B merupakan steganografi yang menyisipkan teks terkompresi Huffman ke-dalam citra digital. Untuk mengukur kualitas citra hasil antara penelitian A dan B digunakan teknik pengukuran secara kuantitatif menggunakan besaran PSNR. Untuk mengetahui pengaruh kompresi teks terhadap hasil PSNR dalam steganografi, dilakukan pengujian secara statistik yaitu paired T Test yang akan membandingkan nilai PSNR dari penelitian A dan B. Dari penelitian yang telah dilakukan, didapatkan hasil statistik yang menunjukkan bahwa H0 ditolak dan H1 diterima. Sehingga dapat disimpulkan bahwa kompresi huffman teks dalam steganografi berpengaruh terhadap nilai PSNR
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b Quark production cross sections and the b {minus} {bar b} correlated production cross section at CDF
No full textRecent results on b quark and B meson production cross sections have been obtained at {radical}s = 1.8 TeV proton-antiproton collisions using the Collider Detector Facility (CDF) at Fermilab, using the exclusive decay modes B{sup {+-}} {yields}J/{Psi} K{sup {+-}} and B{sup 0} {yields} J/{Psi} K*. Another measurement made using data from the 1988--89 run on the correlated b + {bar b} cross section is also presented
Measurement of B(t -> Wb)/B(t -> Wq) at the Collider Detector at Fermilab
No full textWe present a measurement of the ratio of top-quark branching fractions R=B(t -> Wb)/B(t -> Wq), where q can be a b, s, or a d quark, using lepton-plus-jets and dilepton data sets with an integrated luminosity of similar to 162 pb(-1) collected with the Collider Detector at Fermilab during Run II of the Tevatron. The measurement is derived from the relative numbers of t (t) over bar events with different multiplicity of identified secondary vertices. We set a lower limit of R > 0.61 at 95% confidence level
Sobre a redundância de grau ß de códigos binários
No full textDissertaçao (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-Graduação em Matemática, Florianópolis, 198
Energetics of the Charge-Coupled Substitution Si4+ Na++ T3+ in the-Glasses NaTO2–SiO2 (T = Al, Fe, Ga, B)
No full textHeats of solution in molten 2PbO·B2O3 at 973 K are reported for glasses xNaT3+O2–(1 –x)SiO2 for T = Fe, Ga. These measurements, combined with previous data for T = Al, B, give a relative measure of the enthalpy of the charge-coupled substitution Si4+→ Na++ T3+. The heats of solution become more endothermic with increasing x for x→ 0.5 and exhibit a maximum near x= 0.5. This indicates an exothermic enthalpy for the substitution and an overall stabilization of the glasses. The degree to which the glasses are stabilized decreases in the order Al > Ga > Fe > B. On the basis of molecular orbital calculations, X-ray scattering, and Raman spectroscopy, it is argued that this trend is primarily due to a decrease in the range of energetically favorable T–O–T bond angles as Al, Ga, Fe, and B are substituted for Si
Fast Huffman decoding by exploiting data level parallelism
No full textThe frame rates and resolutions of digital videos are on the rising edge. Thereby, pushing the compression ratios of video coding standards to their limits, resulting in more complex and computational power hungry algorithms. Programmable solutions are gaining interest to keep up the pace of the evolving video coding standards, by reducing the time-to-market of upcoming video products. However, to compete with hardwired solutions, parallelism needs to be exploited on as many levels as possible. In this paper the focus will be on data level parallelism. Huffman coding is proven to be very efficient and therefore commonly applied in many coding standards. However, due to the inherently sequential nature, parallelization of the Huffman decoding is considered hard. The proposed fully flexible and programmable acceleration exploits available data level parallelism in Huffman decoding. Our implementation achieves a decoding speed of 106 MBit/s while running on a 250 MHz processor. This is a speed-up of 24× compared to our sequential reference implementation
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