94,292 research outputs found
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A letter from Lisa C. Stark Walsh to Dr. Hector P. Garcia, thanking him for agreeing to be a part of the premiere of TMA today.
No full textA letter from Lisa C. Stark Walsh to Dr. Hector P. Garcia, thanking him for agreeing to be a part of the premiere of TMA today
Marriage record of Walsh, P. and Sego, M. L.
No full textMarriage license for P. Walsh and M.L. Sego. C.H. Nash was the officiant
TCM, TTCM, BICM and BICM-ID Assisted MMSE Multi-User Detected SDMA-OFDM Using Walsh-Hadamard Spreading
No full textSpace Division Multiple Access (SDMA) aided Orthogonal Frequency Division Multiplexing (OFDM) systems assisted by efficient Multi-User Detection (MUD) techniques have recently attracted intensive research interests. Forward Error Correction (FEC) schemes and frequency-domain spreading techniques can be efficiently amalgamated with SDMA-OFDM systems for the sake of improving the achievable performance. In this contribution a Coded Modulation (CM) assisted and Minimum Mean-Square Error (MMSE) multi-user detected SDMA-OFDM system combined with Walsh-Hadamard-Transform-Spreading (WHTS) across a number of subcarriers is proposed. The various CM schemes used are Trellis Coded Modulation (TCM), Turbo TCM (TTCM), Bit-Interleaved Coded Modulation (BICM) and Iteratively Decoded BICM (BICM-ID), which constitute bandwidth efficient schemes that combine the functions of coding and modulation. Invoking the WHTS technique is capable of further improving the average Bit Error Rate (BER) performance of the CM-SDMA-OFDM system, since the bursty error effects imposed by the frequency-domain fading encountered are spread over the entire WHT block length, therefore increasing the chances of correcting the transmission errors by the CM decoders
Recommended from our members
A letter from Lisa C. Stark Walsh to Dr. Hector P. Garcia, thanking him for agreeing to be a part of the premiere of TMA today with an attacked itinerary of questions.
No full textA letter from Lisa C. Stark Walsh to Dr. Hector P. Garcia, thanking him for agreeing to be a part of the premiere of TMA today with an attacked itinerary of questions
Estudo da transformada de Walsh-Hadamard aplicada à transmissão OFDM
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica.Esta dissertação apresenta um estudo da aplicação da Transformada de Walsh-Hadamard (WHT) em diferentes sistemas OFDM. Os sistemas avaliados envolvem a transmissão sem fio entre uma antena transmissora e uma receptora (sistema SISO), e duas antenas transmissoras e uma receptora (sistema MISO Alamouti). A WHT espalha o sinal de informação antes de ser modulado no sistema OFDM. Conseqüentemente, os efeitos de desvanecimento provocados pelos canais correspondentes a cada subportadora OFDM também são espalhados, resultando em uma condição de desvanecimento médio destes canais. Isto leva a um aumento da robustez dos canais das subportadoras que mais sofreram com a transmissão puramente OFDM, mas degrada a condição de desvanecimento das mais robustas. Para verificar esta característica da WHT e o ganho de desempenho que ela possa impactar ao sistema OFDM, foram realizadas simulações com sistemas OFDM com e sem o uso da WHT. Assim, foi possível avaliar o desempenho desta técnica no
Low computational complexity variable block size (VBS) partitioning for motion estimation using the Walsh Hadamard transform (WHT)
No full textVariable Block Size (VBS) based motion estimation has
been adapted in state of the art video coding, such as
H.264/AVC, VC-1. However, a low complexity H.264/AVC
encoder cannot take advantage of VBS due to its power consumption
requirements. In this paper, we present a VBS partition
algorithm based on a binary motion edge map without
either initial motion estimation or Rate-Distortion (R-D)
optimization for selecting modes. The proposed algorithm
uses the Walsh Hadamard Transform (WHT) to create a binary
edge map, which provides a computational complexity
cost effectiveness compared to other light segmentation
methods typically used to detect the required region
A review of the electrodeposition of metal matrix composite coatings by inclusion of particles in a metal layer: an established and diversifying technology
No full textFollowing a brief overview of their history, which dates back to the 1920s with marked developments during the 1960s and 1970s, the principles of composite coatings, achieved by including particles dispersed in a bath into a growing electrodeposited metal layer, are considered. The principles and role of electroplating compared to other techniques for realising such coatings, are considered. A good quality particle dispersion (often aided by a suitable type and concentration of surfactants) appropriate choice of work-piece shape/geometry and controlled agitation in the bath are seen to be prerequisites for achieving uniform coatings having a well-dispersed particle content by electroplating. Examples are provided to illustrate the influence of bath composition and plating conditions on deposit properties. Engineering applications of included particle composite layers are illustrated by examples of hard ceramic, soft ceramic and polymer inclusion composite coatings from the recent literature. Current trends in the development of composite plated coatings are summarised and their diverse applications are seen to include the use of finely structured (especially nanostructured) and functionally active particles together with hybrid and more complex, e.g. hierarchical, structures for applications ranging from tribology to speciality electronics, magnetic and electrochemical energy conversion materials
A note on Walsh-Fourier series
No full textIt is shown that the double sequence
{
λ
m
n
}
\{ {\lambda _{mn}}\}
with
λ
m
n
=
1
{\lambda _{mn}} = 1
if
n
⩽
m
n \leqslant m
and
0
0
otherwise is an
L
p
{L^p}
multiplier for the Walsh system in two dimensions only if
p
=
2
p = 2
. This result is then used to show that the one-dimensional trigonometric system and the Walsh system are nonequivalent bases of the Banach space
L
p
[
0
,
1
]
{L^p}[0,\;1]
, and hence have different
L
p
{L^p}
multipliers,
1
>
p
>
∞
,
p
≠
2
1 > p > \infty ,\;p \ne 2
.</p
The Walsh Family Resilience Questionnaire: the Italian version
No full textSilvana Rocchi,1 Claudio Ghidelli,2 Roberto Burro,3 Michele Vitacca,4 Simonetta Scalvini,5 Anna Maria Della Vedova,6 Gianmarco Roselli,7 Jean-Pierre Ramponi,8 Giorgio Bertolotti9 1Psychology Service, ICS Maugeri Spa SB, Institute of Lumezzane, 2Psychological Counselling Service, Università Cattolica del Sacro Cuore, Brescia, 3Department of Human Sciences, University of Verona, Verona, 4Respiratory Rehabilitation Division, 5Cardiac Rehabilitation Division, ICS Maugeri Spa SB, Institute of Lumezzane, 6Department of Clinical and Experimental Sciences, University of Brescia, 7Department of Mental Health, Spedali Civili, 8ICS Maugeri Spa SB, Institute of Lumezzane, Brescia, 9Psychology Unit, ICS Maugeri Spa SB, Institute of Tradate, Varese, Italy Background: Resilience focuses on strength under stress, in the context of adversity. Walsh’s theoretical model identifies relational processes that allow families to tackle and overcome critical situations, dividing them into three domains of family function. The aim of this study was to assess resilience in families of patients with a chronic disease by adapting and validating the Italian version of the Walsh Family Resilience Questionnaire (Walsh-IT). Patients and methods: An Italian adult sample of 421 participants (patients and relatives) was collected with the aim to assess the reliability and validity of the Walsh-IT. Concurrent validity was carried out by comparing this instrument with the Family Adaptability and Cohesion Evaluation Scale III (FACES III) administered at the same time as the Walsh-IT. Results: Reliability showed high correlation between repeated measurements. The alpha coefficient was 0.946. Both parallel analysis and minimum average partial criteria suggested that the best number of domains is equal to 3, explaining 50.4% of the total variance. Based on the results obtained from the Rasch analysis, items 10, 11, 16, 22, and 23 have been removed resulting in a short-form questionnaire (Walsh-IT-R) of 26 items with three domains: shared beliefs and support (SBS, α=0.928); family organization and interaction (FOI, α=0.863); and utilization of social resources (USR, α=0.567). The total score of the Walsh-IT-R was strongly correlated with the total score of FACES III Real Family Scale (r=0.68; p<0.0001). Conclusion: Results support that the Walsh-IT-R is a valid instrument for the assessment of family resilience in Italy when contending with the challenges of chronic disease. It could be used in pre- and post-assessment in practice effectiveness research, offering a profile of family resilience processes at the start and end of interventions and follow-up. Keywords: family resilience, chronic illness, assessment, Rasch model, family functionin
Platybrotica Cabrera & Walsh 2004
No full textGenus <i>Platybrotica</i> Cabrera & Walsh, 2004 <p> <i>Platybrotica</i> Cabrera & Walsh, 2004: 7 (type species <i>Platybrotica misionensis</i> Cabrera & Walsh, 2004, by original designation).</p> Remarks <p> This genus contains a single species, <i>P. misionensis</i>. Externally, it is very similar to <i>Diabrotica</i>, except the male antennae are enlarged and modified. The species occurs in Argentina.</p>Published as part of <i>Viswajyothi, Keezhpattillam & Clark, Shawn M., 2022, New World genera of Galerucinae Latreille, 1802 (tribes Galerucini Latreille, 1802, Metacyclini Chapuis, 1875, and Luperini Gistel, 1848): an annotated list and identification key (Coleoptera: Chrysomelidae), pp. 1-102 in European Journal of Taxonomy 842</i> on page 21, DOI: 10.5852/ejt.2022.842.1945, <a href="http://zenodo.org/record/7222499">http://zenodo.org/record/7222499</a>
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