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Letteratura scientifica selezionata sul tema "Zero latence"

Autore: Grafiati

Pubblicato: 16 novembre 2024

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Articoli di riviste sul tema "Zero latence"

Dwivedi, Dwivedi, MB Rao, Sada Nand Dwivedi, S. V. S. Deo e Rakesh Shukla. "On Classifying At Risk Latent Zeros Using Zero Inflated Models". Journal of Data Science 12, n. 2 (9 marzo 2021): 307–23. http://dx.doi.org/10.6339/jds.201404_12(2).0006.

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Oostvogels, Jonathan, Fan Yang, Sam Michiels, Wouter Joosen e Danny Hughes. "Zero-Wire". GetMobile: Mobile Computing and Communications 25, n. 1 (15 giugno 2021): 34–38. http://dx.doi.org/10.1145/3471440.3471450.

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Latency-sensitive applications for the Internet of Things (IoT) often require performance guarantees that contemporary wireless networks fail to offer. Application scenarios involving real-time control of industrial machinery, robotics, or delay-sensitive actuation therefore typically still rely on cables: today's wireless networks cannot deliver messages in a sufficiently small and predictable amount of time. Drop-in wireless replacements for these cabled systems would nevertheless provide great benefit by eliminating the high cost and complexity associated with running cables in harsh industrial environments [1]. The symbolsynchronous bus, introduced in this article and embodied in a platform called Zero-Wire, is a novel wireless networking paradigm that addresses this gap. Using concurrent optical transmissions, it strives to bring low-latency deterministic networking to the wireless IoT.

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Bell, Simon, e Steve Walker. "Futurescaping Infinite Bandwidth, Zero Latency". Futures 43, n. 5 (giugno 2011): 525–39. http://dx.doi.org/10.1016/j.futures.2011.01.011.

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ALLCROFT, D. J., e C. A. GLASBEY. "Analysis of crop lodging using a latent variable model". Journal of Agricultural Science 140, n. 4 (giugno 2003): 383–93. http://dx.doi.org/10.1017/s0021859603003332.

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A method for quantifying treatment comparisons for a situation in which there are too many zeros in the dataset for a conventional analysis of variance to be valid is presented. The method assumes the existence of a latent variable such that zero observations correspond to values below a threshold, and non-zero observations are transformed to fit the part of the distribution above the threshold. The method is known as Tobit analysis in econometrics. Parameters are estimated by maximum likelihood and standard errors obtained, all using standard numerical routines. Use of the method is demonstrated by analysis of a dataset of crop lodging, and it is anticipated to be widely applicable to other types of data for which high numbers of zeros prevent conventional analysis.

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Nikitha, Nikitha Nikitha. "Future Tech 5g Virtual Zero Latency". International Journal of Informatics and Communication Technology (IJ-ICT) 5, n. 3 (1 dicembre 2016): 106. http://dx.doi.org/10.11591/ijict.v5i3.pp106-110.

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<p>With the point of conveying any data in whenever and anyplace, the people to come (5G) remote communication systems turn into a style theme in the remote examination territories and new waveform, as one of the key empowering advances in 5G physical layer, pulls in developing exploration considerations lately. Be that as it may, the current method for waveform examination or investigation depends on the change of range productivity or use, while the majority of them neglects to research the vitality proficiency conduct, which is appeared to be the key execution metric of 5G frameworks. In this paper, the most part is concentrated on looking over the waveforms from the vitality proficiency perspective. Two classifications of waveforms, specifically channel based waveform and spreading-based waveform, are broke down and the related execution issues are talked about. Besides, we actualize the above waveforms utilizing programming characterized radio based model stage and produce the estimation results for the vitality productivity correlation.</p>

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Wu, Bo-Sheng, Chen-Chiung Hsieh e Yu-Wei Chen. "Zero-latency scheduling scheme for broadcasting popular movies". IEEE Transactions on Consumer Electronics 56, n. 4 (novembre 2010): 2317–23. http://dx.doi.org/10.1109/tce.2010.5681106.

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Lisberger, S. G. "Visual tracking in monkeys: evidence for short-latency suppression of the vestibuloocular reflex". Journal of Neurophysiology 63, n. 4 (1 aprile 1990): 676–88. http://dx.doi.org/10.1152/jn.1990.63.4.676.

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1. Monkeys normally use a combination of smooth head and eye movements to keep the eyes pointed at a slowly moving object. The visual inputs from target motion evoke smooth pursuit eye movements, whereas the vestibular inputs from head motion evoke a vestibuloocular reflex (VOR). Our study asks how the eye movements of pursuit and the VOR interact. Is there a linear addition of independent commands for pursuit and the VOR? Or does the interaction of visual and vestibular stimuli cause momentary, "parametric" modulation of transmission through VOR pathways? 2. We probed for the state of the VOR and pursuit by presenting transient perturbations of target and/or head motion under different steady-state tracking conditions. Tracking conditions included fixation at straight-ahead gaze, in which both the head and the target were stationary; "times-zero (X0) tracking," in which the target and head moved in the same direction at the same speed; and "times-two (X2) tracking," in which the target and head moved in opposite directions at the same speed. 3. Comparison of the eye velocities evoked by changes in the direction of X0 versus X2 tracking revealed two components of the tracking response. The earliest component, which we attribute to the VOR, had a latency of 14 ms and a trajectory that did not depend on initial tracking conditions. The later component had a latency of 70 ms or less and a trajectory that did depend on tracking conditions. 4. To probe the latency of pursuit eye movements, we imposed perturbations of target velocity imposed during X0 and X2 tracking. The resulting changes in eye velocity had latencies of at least 100 ms. We conclude that the effects of initial tracking conditions on eye velocity at latencies of less than 70 ms cannot be caused by visual feedback through the smooth-pursuit system. Instead, there must be another mechanism for short-latency control over the VOR; we call this component of the response "short-latency tracking." 5. Perturbations of head velocity or head and target velocity during X0 and X2 tracking showed that short-latency tracking depended only on the tracking conditions at the time the perturbation was imposed. The VOR appeared to be suppressed when the initial conditions were X0 tracking. 6. The magnitude of short-latency tracking depended on the speed of initial head and target movement. During X0 tracking at 15 deg/s, short-latency tracking was modest. When the initial speed of head and target motion was 60 deg/s, the amplitude of short-latency tracking was quite large and its latency became as short as 36 ms.(ABSTRACT TRUNCATED AT 400 WORDS)

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Jack, Robert H., Adib Mehrabi, Tony Stockman e Andrew McPherson. "Action-sound Latency and the Perceived Quality of Digital Musical Instruments". Music Perception 36, n. 1 (1 settembre 2018): 109–28. http://dx.doi.org/10.1525/mp.2018.36.1.109.

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Asynchrony between tactile and auditory feedback (action-sound latency) when playing a musical instrument is widely recognized as disruptive to musical performance. In this paper we present a study that assesses the effects of delayed auditory feedback on the timing accuracy and judgments of instrument quality for two groups of participants: professional percussionists and non-percussionist amateur musicians. The amounts of delay tested in this study are relatively small in comparison to similar studies of auditory delays in a musical context (0 ms, 10 ms, 10 ms ± 3 ms, 20 ms). We found that both groups rated the zero latency condition as higher quality for a series of quality measures in comparison to 10 ms ± 3 ms and 20 ms latency, but did not show a significant difference in rating between 10 ms latency and zero latency. Professional percussionists were more aware of the latency conditions and showed less variation of timing under the latency conditions, although this ability decreased as the temporal demands of the task increased. We compare our findings from each group and discuss them in relation to latency in interactive digital systems more generally and experimentally similar work on sensorimotor control and rhythmic performance.

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Saad-Roy, Chadi M., Ned S. Wingreen, Simon A. Levin e Bryan T. Grenfell. "Dynamics in a simple evolutionary-epidemiological model for the evolution of an initial asymptomatic infection stage". Proceedings of the National Academy of Sciences 117, n. 21 (8 maggio 2020): 11541–50. http://dx.doi.org/10.1073/pnas.1920761117.

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Pathogens exhibit a rich variety of life history strategies, shaped by natural selection. An important pathogen life history characteristic is the propensity to induce an asymptomatic yet productive (transmissive) stage at the beginning of an infection. This characteristic is subject to complex trade-offs, ranging from immunological considerations to population-level social processes. We aim to classify the evolutionary dynamics of such asymptomatic behavior of pathogens (hereafter “latency”) in order to unify epidemiology and evolution for this life history strategy. We focus on a simple epidemiological model with two infectious stages, where hosts in the first stage can be partially or fully asymptomatic. Immunologically, there is a trade-off between transmission and progression in this first stage. For arbitrary trade-offs, we derive different conditions that guarantee either at least one evolutionarily stable strategy (ESS) at zero, some, or maximal latency of the first stage or, perhaps surprisingly, at least one unstable evolutionarily singular strategy. In this latter case, there is bistability between zero and nonzero (possibly maximal) latency. We then prove the uniqueness of interior evolutionarily singular strategies for power-law and exponential trade-offs: Thus, bistability is always between zero and maximal latency. Overall, previous multistage infection models can be summarized with a single model that includes evolutionary processes acting on latency. Since small changes in parameter values can lead to abrupt transitions in evolutionary dynamics, appropriate disease control strategies could have a substantial impact on the evolution of first-stage latency.

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Kim, Sunghwan, Gyusun Lee, Jiwon Woo e Jinkyu Jeong. "Zero-Copying I/O Stack for Low-Latency SSDs". IEEE Computer Architecture Letters 20, n. 1 (1 gennaio 2021): 50–53. http://dx.doi.org/10.1109/lca.2021.3064876.

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Più fonti

Tesi sul tema "Zero latence"

Kanj, Hind. "Zero-Latency strategies for video transmission using frame extrapolation". Electronic Thesis or Diss., Valenciennes, Université Polytechnique Hauts-de-France, 2024. https://ged.uphf.fr/nuxeo/site/esupversions/53e0c0d3-296e-477f-9adc-2dbc315128f5.

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La demande de diffusion sans interruption de contenu vidéo et de haute qualité avec une latence minimale est essentielle dans les applications telles que la diffusion sportive et le contrôle de systèmes à distance. Cependant, la diffusion vidéo reste exposée à des défis en raison des caractéristiques variables des canaux de communication, qui peuvent avoir un impact sur la qualité de l'expérience en termes de qualité vidéo et de latence de bout en bout (le temps entre l'acquisition de la vidéo à l'émetteur et son affichage au récepteur).L'objectif de cette thèse est d'aborder le problème des applications en temps réel avec transmission unicast du serveur au client, telles que les applications de contrôle à distance, tout en maintenant une bonne qualité. Nous testons l'efficacité d'une technique récente d'apprentissage profond pour la compensation de la latence dans le schéma de transmission vidéo et son impact sur la qualité. Cette technique prédit les images futures à l'aide des images précédentes disponibles, ce qui permet d'afficher les images au moment voulu. Les résultats montrent que l'extrapolation est prometteuse, en particulier pour les contenus avec peu d'informations temporelles. Cependant, elle doit encore être améliorée en termes de qualité, de prédiction à long terme et de délai d'extrapolation.Plusieurs études se concentrent sur l'intégration d'un système hybride numérique-analogique pour améliorer la qualité perceptive, profitant des avantages des méthodes numériques et analogiques. Nous étudions l'efficacité d'un schéma hybride à faible latence en termes de réduction de la latence tout en maintenant une qualité vidéo élevée. Les résultats montrent que le système hybride améliore la qualité de la vidéo reçue dans la plupart des cas. Cependant, les artefacts d'extrapolation surpassent les artefacts d'encodage et masquent les avantages des schémas hybrides. Ainsi, l'amélioration des performances des schémas hybrides repose sur l'amélioration de l'extrapolation.En plus, les méthodes de diffusion adaptative HTTP ont prouvé leur efficacité pour améliorer la qualité de l'expérience en ajustant le débit d'encodage en fonction des conditions du canal. La plupart de ces algorithmes sont utilisés au client, ce qui pose des problèmes pour répondre aux exigences de latence des applications en temps réel. Dans ces applications, les vidéos sont acquises, compressées et transmises à partir de dispositifs jouant le rôle de serveurs. Donc, ces méthodes pilotées par le client ne conviennent pas à cause de la variabilité des conditions du canal. En plus, la prise de décision se fait avec une périodicité de l'ordre de la seconde, ce qui n'est pas assez réactif lorsque le serveur se déplace, ce qui entraîne des retards importants. Il est donc important d'utiliser une granularité d'adaptation plus fine. Nous visons à contrôler la latence de bout en bout tout en garantissant une qualité d'expérience élevée. Un contrôle du débit d'encodage au niveau d'image à l'émetteur est combiné à une extrapolation au récepteur pour compenser le retard de bout en bout. Le contrôle du débit au niveau d'image permet au système de s'adapter aux variations soudaines des conditions du canal. Un retard apparent de bout en bout nul peut être atteint au prix d'une perte de qualité du signal. Les algorithmes existants tentent d'optimiser les sources individuelles de retard dans le schéma de diffusion vidéo, mais pas de réduire la latence de bout en bout et d'atteindre une latence nulle. Un «Model Predictive Control» impliquant le niveau de mémoire tampon à l'émetteur et l'estimation du débit canal est utilisée pour trouver la valeur optimale du débit d'encodage pour chaque image. Il ajuste dynamiquement le compromis entre le débit de codage et l'horizon d'extrapolation, tout en prévoyant l'impact de la décision relative au débit d'encodage sur les images futures, pour améliorer la qualité d'expérience
The demand for seamless, high-quality video content delivery with minimal latency is paramount in today's applications such as sports broadcasting, videoconferencing, and remote system control. However, video delivery still faces challenges due to unpredictable nature of communication channels. The variations in channel characteristics can impact the quality of experience in terms of content quality and End-To-End latency - the time elapsed between video acquisition at the transmitter and its display at the receiver.The aim of this thesis is to address the issue of real time applications with unicast transmission from server to client such as remote control applications, while maintaining a good quality. We test the effectiveness of a recent deep learning technique for latency compensation in the video transmission scheme and its impact on video quality. This technique predicts future frames using available previous frames, allowing the end-user to display the images at the desired time. The results demonstrate the promise of extrapolation, especially for content with low temporal information. However, it still needs to be improved in terms of quality, long-term prediction, and extrapolation delay.Various studies focus on the integration of a hybrid digital-analog scheme to improve the perceptual quality, taking advantage of the strengths of both digital and analog methods. We study the effectiveness of low-latency hybrid scheme in term of reducing latency while maintaining high video quality. The results show that the hybrid scheme improves the quality of the received video in most cases. However, the extrapolation artifacts outweigh encoding artifacts and mask the advantages of hybrid schemes. Thus, the improvement in hybrid scheme performance relies on the enhancement of extrapolation.Moreover, HTTP Adaptive Streaming methods have proven their effectiveness in improving the quality of experience by dynamically adjusting the encoding rate based on channel conditions. However, most of these adaptation algorithms are implemented at the client level, which poses challenges in meeting latency requirements for real time applications. In addition, in real time application, videos are acquired, compressed, and transmitted from the device acting as the server. Therefore, client-driven rate adaptation approaches are not suitable due to the variability of the channel characteristics. Moreover, in these methods, the decision-making is done with a periodicity of the order of a second, which is not reactive enough when the server is moving, leading to significant delays. Therefore, it is important to use a finer adaptation granularity in order to reduce the End-To-End delay. We aim to control the End-To-End latency during video delivery while ensuring a high quality of experience. A frame-level encoder rate control at the transmitter side is combined with a frame extrapolation at the receiver side to compensate the End-To-End delays. Frame-level rate control enables the system to adapt to sudden variations of channel characteristics. Null apparent End-To-End delay can be reached at the price of some signal quality. To the best of our knowledge, state-of-the-art algorithms try to optimize the individual sources of delay in the video delivery scheme, but not to reduce the whole End-To-End latency and achieve zero latency. A model predictive control approach involving the buffer level at the transmitter and the throughput estimation is used to find the optimal value of encoding rate for each frame. It dynamically adjusts the trade-off between the encoding rate and the extrapolation horizon at the receiver, while predicting the impact of the encoding rate decision on future frames, thus providing the best quality of experience

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Wang, Qian. "Zero-shot visual recognition via latent embedding learning". Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/zeroshot-visual-recognition-via-latent-embedding-learning(bec510af-6a53-4114-9407-75212e1a08e1).html.

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Traditional supervised visual recognition methods require a great number of annotated examples for each concerned class. The collection and annotation of visual data (e.g., images and videos) could be laborious, tedious and time-consuming when the number of classes involved is very large. In addition, there are such situations where the test instances are from novel classes for which training examples are unavailable in the training stage. These issues can be addressed by zero-shot learning (ZSL), an emerging machine learning technique enabling the recognition of novel classes. The key issue in zero-shot visual recognition is the semantic gap between visual and semantic representations. We address this issue in this thesis from three different perspectives: visual representations, semantic representations and the learning models. We first propose a novel bidirectional latent embedding framework for zero-shot visual recognition. By learning a latent space from visual representations and labelling information of the training examples, instances of different classes can be mapped into the latent space with the preserving of both visual and semantic relatedness, hence the semantic gap can be bridged. We conduct experiments on both object and human action recognition benchmarks to validate the effectiveness of the proposed ZSL framework. Then we extend the ZSL to the multi-label scenarios for multi-label zero-shot human action recognition based on weakly annotated video data. We employ a long short term memory (LSTM) neural network to explore the multiple actions underlying the video data. A joint latent space is learned by two component models (i.e. the visual model and the semantic model) to bridge the semantic gap. The two component embedding models are trained alternately to optimize the ranking based objectives. Extensive experiments are carried out on two multi-label human action datasets to evaluate the proposed framework. Finally, we propose alternative semantic representations for human actions towards narrowing the semantic gap from the perspective of semantic representation. A simple yet effective solution based on the exploration of web data has been investigated to enhance the semantic representations for human actions. The novel semantic representations are proved to benefit the zero-shot human action recognition significantly compared to the traditional attributes and word vectors. In summary, we propose novel frameworks for zero-shot visual recognition towards narrowing and bridging the semantic gap, and achieve state-of-the-art performance in different settings on multiple benchmarks.

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Coaguila, Zavaleta Katherine Elizabeth. "Modelos série de potência com excesso de zeros observáveis e latentes". Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/8890.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
The present work's main objective is to study the significance of zeros in an observable and latent data. In observable data set that occur excess of zeros, its common to have sobredispersion. In this sense, the models zero-inflated power series (ZISP) were proposed to accommodate these excesses. Specifically for the analysis of observed data, it was made a study of gradient statistic, proposed by Terrell (2002), to test the hypotheses in relation to inflation parameter ZISP models. This test is based on evaluation of the performance of gradient statistic compared with the classical likelihood ratio (Wilks, 1938), score (Rao, 1948) and Wald (Wald, 1943) statistics. In addition, recently, fragility has being modeled by discrete distributions using non-negative integers values that allows zero fragility, which means, individuals who do not present the event of interest (fraction of zero risk). For this type of latent data, we have proposed a new survival model induced by discrete frailty with ZISP distribution. This proposal brings a real description of individuals without risk, because individuals cured due to genetic factors (immune) are modeled by fraction of deterministic zero risk, while the cured by treatment are modeled by fraction of random zero risk. In this context, we also developed the gradient statistic to verify parameter significance of zero risk for data modeled by fraction of deterministic zero risk. To show our proposals, we present the results of simulation studies and applications using real data.
O presente trabalho teve como objetivo principal, estudar a significância de zeros numa análise de dados observáveis e latentes. Nos conjuntos de dados observáveis que ocorrem excessos de zeros, é comum a existência de sobredispersão. Neste sentido os modelos Zero-Inflacionados Série de Potência (ZISP) foram propostos para acomodar o excesso de zeros. Especifcamente para a análise de dados observáveis com excesso de zeros desenvolvemos um estudo da estatística gradiente, proposta por Terrell (2002), para testar as hipóteses em relação ao parâmetro de inflação do modelo ZISP, baseado na avaliação da performance da estatística gradiente em comparação com as estatísticas clássicas da razão de verossimilhan ça (Wilks, 1938), escore (Rao, 1948) e Wald (Wald, 1943). Por outro lado, recentemente a fragilidade é modelada por distribuições discretas sob os inteiros não negativos e permite fragilidade zero, isto é, indivíduos que não apresentam o evento de interesse (fração de risco zero). Para este tipo dados de latentes, propusemos um novo modelo de sobrevivência induzida por fragilidade discreta com distribuição ZISP. Essa proposta traz uma descrição mais real dos indivíduos sem risco, pois inclui indivíduos curados devido aos fatores genéticos (imunes) modelados como a fração de risco zero determinístico, enquanto que, os indivíduos curados por tratamento são modelados pela fração de risco zero aleatório. Neste contexto desenvolvemos também a estatística gradiente para verificar a significância do parâmetro de risco zero para dados modelados pela fração de risco zero determinístico. E para completar o desenvolvimento das propostas, apresentamos os resultados de estudos de simulação e exemplos de aplicação com uso de dados reais.

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Kadel, Rajendra. "A Latent Mixture Approach to Modeling Zero-Inflated Bivariate Ordinal Data". Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4701.

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Multivariate ordinal response data, such as severity of pain, degree of disability, and satisfaction with a healthcare provider, are prevalent in many areas of research including public health, biomedical, and social science research. Ignoring the multivariate features of the response variables, that is, by not taking the correlation between the errors across models into account, may lead to substantially biased estimates and inference. In addition, such multivariate ordinal outcomes frequently exhibit a high percentage of zeros (zero inflation) at the lower end of the ordinal scales, as compared to what is expected under a multivariate ordinal distribution. Thus, zero inflation coupled with the multivariate structure make it difficult to analyze such data and properly interpret the results. Methods that have been developed to address the zero-inflated data are limited to univariate-logit or univariate-probit model, and extension to bivariate (or multivariate) probit models has been very limited to date. In this research, a latent variable approach was used to develop a Mixture Bivariate Zero-Inflated Ordered Probit (MBZIOP) model. A Bayesian MCMC technique was used for parameter estimation. A simulation study was then conducted to compare the performances of the estimators of the proposed model with two existing models. The simulation study suggested that for data with at least a moderate proportion of zeros in bivariate responses, the proposed model performed better than the comparison models both in terms of lower bias and greater accuracy (RMSE). Finally, the proposed method was illustrated with a publicly-available drug-abuse dataset to identify highly probable predictors of: (i) being a user/nonuser of marijuana, cocaine, or both; and (ii), conditional on user status, the level of consumption of these drugs. The results from the analysis suggested that older individuals, smokers, and people with a prior criminal background have a higher risk of being a marijuana only user, or being the user of both drugs. However, cocaine only users were predicted on the basis of being younger and having been engaged in the criminal-justice system. Given that an individual is a user of marijuana only, or user of both drugs, age appears to have an inverse effect on the latent level of consumption of marijuana as well as cocaine. Similarly, given that a respondent is a user of cocaine only, all covariates--age, involvement in criminal activities, and being of black race--are strong predictors of the level of cocaine consumption. The finding of older age being associated with higher drug consumption may represent a survival bias whereby previous younger users with high consumption may have been at elevated risk of premature mortality. Finally, the analysis indicated that blacks are likely to use less marijuana, but have a higher latent level of cocaine given that they are user of both drugs.

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Arrabal, Claude Thiago. "Estimação clássica e bayesiana para relação espécieárea com distribuições truncadas no zero". Universidade Federal de São Carlos, 2012. https://repositorio.ufscar.br/handle/ufscar/4562.

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In ecology, understanding the species-area relationship (SARs) are extremely important to determine species diversity. SARs are fundamental to assess the impact due to the destruction of natural habitats, creation of biodiversity maps, to determine the minimum area to preserve. In this study, the number of species is observed in different area sizes. These studies are referred in the literature through nonlinear models without assuming any distribution for the data. In this situation, it only makes sense to consider areas in which the counts of species are greater than zero. As the dependent variable is a count data, we assume that this variable comes from a known distribution for discrete data positive. In this paper, we used the zero truncated Poisson distribution (ZTP) and zero truncated Negative Binomial (ZTNB) to represent the probability distribution of the random variable species diversity number. To describe the relationship between species diversity and habitat, we consider nonlinear models with asymptotic behavior: Exponencial Negativo, Weibull, Logístico, Chapman-Richards, Gompertz e Beta. In this paper, we take a Bayesian approach to fit models. With the purpose of obtain the conditional distributions, we propose the use of latent variables to implement the Gibbs sampler. Introducing a comparative study through simulated data and will consider an application to a real data set.
Em ecologia, a compreensão da relação espécie-área (SARs) é de extrema importância para a determinação da diversidade de espécies e avaliar o impacto devido à destruição de habitats naturais. Neste estudo, observa-se o número de espécies em diferentes tamanhos de área. Estes estudos são abordados na literatura através de modelos não lineares sem assumir alguma distribuição para os dados. Nesta situação, só faz sentido considerar áreas nas quais as contagens das espécies são maiores do que zero. Como a variável dependente é um dado de contagem, assumiremos que esta variável provém de alguma distribuição conhecida para dados discretos positivos. Neste trabalho, utilizamos as distribuições de Poisson zero-truncada (PZT) e Binomial Negativa zero-truncada (BNZT) para representar a distribuição do número de espécies. Para descrever a relação espécie-área, consideramos os modelos não lineares com comportamento assintótico: Exponencial Negativo, Weibull, Logístico, Chapman-Richards, Gompertz e Beta. Neste trabalho os modelos foram ajustados através do método de verossimilhança, sendo proposto uma abordagem Bayesiana com a utilização de variáveis latentes auxiliares para a implementação do Amostrador de Gibbs.

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Economou, Theodoros. "Bayesian modelling of recurrent pipe failures in urban water systems using non-homogeneous Poisson processes with latent structure". Thesis, University of Exeter, 2010. http://hdl.handle.net/10036/111499.

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Recurrent events are very common in a wide range of scientific disciplines. The majority of statistical models developed to characterise recurrent events are derived from either reliability theory or survival analysis. This thesis concentrates on applications that arise from reliability, which in general involve the study about components or devices where the recurring event is failure. Specifically, interest lies in repairable components that experience a number of failures during their lifetime. The goal is to develop statistical models in order to gain a good understanding about the driving force behind the failures. A particular counting process is adopted, the non-homogenous Poisson process (NHPP), where the rate of occurrence (failure rate) depends on time. The primary application considered in the thesis is the prediction of underground water pipe bursts although the methods described have more general scope. First, a Bayesian mixed effects NHPP model is developed and applied to a network of water pipes using MCMC. The model is then extended to a mixture of NHPPs. Further, a special mixture case, the zero-inflated NHPP model is developed to cope with data involving a large number of pipes that have never failed. The zero-inflated model is applied to the same pipe network. Quite often, data involving recurrent failures over time, are aggregated where for instance the times of failures are unknown and only the total number of failures are available. Aggregated versions of the NHPP model and its zero-inflated version are developed to accommodate aggregated data and these are applied to the aggregated version of the earlier data set. Complex devices in random environments often exhibit what may be termed as state changes in their behaviour. These state changes may be caused by unobserved and possibly non-stationary processes such as severe weather changes. A hidden semi-Markov NHPP model is formulated, which is a NHPP process modulated by an unobserved semi-Markov process. An algorithm is developed to evaluate the likelihood of this model and a Metropolis-Hastings sampler is constructed for parameter estimation. Simulation studies are performed to test implementation and finally an illustrative application of the model is presented. The thesis concludes with a general discussion and a list of possible generalisations and extensions as well as possible applications other than the ones considered.

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Ancelet, Sophie. "Exploiter l'approche hiérarchique bayésienne pour la modélisation statistique de structures spatiales: application en écologie des populations". Phd thesis, AgroParisTech, 2008. http://pastel.archives-ouvertes.fr/pastel-00004396.

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Dans la plupart des questions écologiques, les phénomènes aléatoires d'intérêt sont spatialement structurés et issus de l'effet combiné de multiples variables aléatoires, observées ou non, et inter-agissant à diverses échelles. En pratique, dès lors que les données de terrain ne peuvent être directement traitées avec des structures spatiales standards, les observations sont généralement considérées indépendantes. Par ailleurs, les modèles utilisés sont souvent basés sur des hypothèses simplificatrices trop fortes par rapport à la complexité des phénomènes étudiés. Dans ce travail, la démarche de modélisation hiérarchique est combinée à certains outils de la statistique spatiale afin de construire des structures aléatoires fonctionnelles "sur-mesure" permettant de représenter des phénomènes spatiaux complexes en écologie des populations. L'inférence de ces différents modèles est menée dans le cadre bayésien avec des algorithmes MCMC. Dans un premier temps, un modèle hiérarchique spatial (Geneclust) est développé pour identifier des populations génétiquement homogènes quand la diversité génétique varie continûment dans l'espace. Un champ de Markov caché, qui modélise la structure spatiale de la diversité génétique, est couplé à un modèle bivarié d'occurrence de génotypes permettant de tenir compte de l'existence d'unions consanguines chez certaines populations naturelles. Dans un deuxième temps, un processus de Poisson composé particulier,appelé loi des fuites, est présenté sous l'angle de vue hiérarchique pour décrire le processus d'échantillonnage d'organismes vivants. Il permet de traiter le délicat problème de données continues présentant une forte proportion de zéros et issues d'échantillonnages à efforts variables. Ce modèle est également couplé à différents modèles sur grille (spatiaux, régionalisés) afin d'introduire des dépendances spatiales entre unités géographiques voisines puis, à un champ géostatistique bivarié construit par convolution sur grille discrète afin de modéliser la répartition spatiale conjointe de deux espèces. Les capacités d'ajustement et de prédiction des différents modèles hiérarchiques proposés sont comparées aux modèles traditionnellement utilisés à partir de simulations et de jeux de données réelles (ours bruns de Suède, invertébrés épibenthiques du Golfe-du-Saint-Laurent (Canada)).

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Lin, Yi-Sheng, e 林易生. "Zero-Latency Cluster-Error Correction and Reliability Analyses for TSVs in 3D ICs". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/77334474475211950617.

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碩士
國立彰化師範大學
電子工程學系
104
In order to extend Moore's Law, three-dimensional stacked integrated circuits (3D-IC) has been seen as a new solution. However, the yield of 3D-IC base on through silicon via(TSV) is still now high. Therefore, TSVs testing and repair methods has become an important issue. Although many of TSVs repair methods have been proposed, but little mention of the symptoms of aging on TSVs soft error monitoring and repair methods. In this paper, we propose an ECC algorithms to deal with the cluster error occurred in TSVs channel. Experiments show that the proposed method can effectively improve about 103 times of MTBR, and 2DPC decoder can correct errors in the 1.72 ns. Comparing with the previous work the proposed method can correct four times of cluster errors in the same size of TSVs array. Keywords : TSVs、Cluster-error、ECC、Aging monitor.

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(8844806), David Okposio. "NET ZERO DESICCANT ASSISTED EVAPORATIVE COOLING FOR DATA CENTERS". Thesis, 2020.

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Evaporative cooling is a highly energy efficient alternative to conventional vapor compression cooling system. The sensible cooling effect of evaporative cooling systems is well documented in the literature. Direct evaporative cooling however increases the relative humidity of the air as it cools it. This has made it unsuitable for data centers and other applications where humidity control is important. Desiccant-based dehumidifiers (liquid, solid or composites) absorb moisture from the cooled air to control humidity and is regenerated using waste heat from the data center. This work is an experimental and theoretical investigation of the use of desiccant assisted evaporative cooling for data center cooling according to ASHRAE thermal guidelines, TC 9.9. The thickness (depth) of the cooling pad was varied to study its effect on sensible heat loss and latent heat gain. The velocity of air through the pad was measured to determine its effect on sensible cooling. The flow rate of water over the pad was also varied to find the optimal flow for rate for dry bulb depression. The configuration was such that the rotary desiccant wheel (impregnated with silica gel) comes after the direct evaporative cooler. The rotary desiccant wheel was split in a 1:1 ratio for cooling and reactivation at lower temperatures. The dehumidification effectiveness of a fixed bed desiccant dehumidifier was compared with that of a rotary desiccant wheel and a thermoelectric dehumidifier. A novel condensate recovery system using the Peltier effect was proposed to recover moisture from the return air stream, (by cooling the return air stream below its dew point temperature) thereby optimizing the water consumption of evaporative cooling technology and providing suitable air quality for data center cooling. The moisture recovery unit was found to reduce the mass of water lost through evaporation by an average of fifty percent irrespective of the pad depth.

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Koemle, Dieter. "The impact of agri-environmental policy and infrastructure on wildlife and land prices". Doctoral thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E538-E.

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Libri sul tema "Zero latence"

Zero Latency Leadership: Driving Equity, Trust, and Sustainability with Emerging Tech. Forbes Books, 2023.

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Capitoli di libri sul tema "Zero latence"

Iafrate, Fernando. "Zero Latency Organization". In From Big Data to Smart Data, 21–23. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119116189.ch3.

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Attig, Christiane, Nadine Rauh, Thomas Franke e Josef F. Krems. "System Latency Guidelines Then and Now – Is Zero Latency Really Considered Necessary?" In Engineering Psychology and Cognitive Ergonomics: Cognition and Design, 3–14. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58475-1_1.

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Gorawski, Marcin, Damian Lis e Anna Gorawska. "CUDA-Powered CTBE Algorithm for Zero-Latency Data Warehouse". In Communications in Computer and Information Science, 358–67. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-23201-0_37.

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Crainiceanu, Ciprian M. "Likelihood Ratio Testing for Zero Variance Components in Linear Mixed Models". In Random Effect and Latent Variable Model Selection, 3–17. New York, NY: Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-76721-5_1.

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Gorawski, Marcin, Damian Lis e Anna Gorawska. "Zero–Latency Data Warehouse System Based on Parallel Processing and Cache Module". In Intelligent Data Engineering and Automated Learning – IDEAL 2014, 465–74. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10840-7_56.

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Narayan, Sanath, Akshita Gupta, Fahad Shahbaz Khan, Cees G. M. Snoek e Ling Shao. "Latent Embedding Feedback and Discriminative Features for Zero-Shot Classification". In Computer Vision – ECCV 2020, 479–95. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-58542-6_29.

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Qian, Yijun, Lijun Yu, Wenhe Liu e Alexander G. Hauptmann. "Rethinking Zero-shot Action Recognition: Learning from Latent Atomic Actions". In Lecture Notes in Computer Science, 104–20. Cham: Springer Nature Switzerland, 2022. http://dx.doi.org/10.1007/978-3-031-19772-7_7.

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Wu, Tongtong, Meng Wang, Huan Gao, Guilin Qi e Weizhuo Li. "Zero-Shot Slot Filling via Latent Question Representation and Reading Comprehension". In PRICAI 2019: Trends in Artificial Intelligence, 123–36. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29894-4_10.

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Chen, Kai, Yifeng Lian e Yingjun Zhang. "AutoDunt: Dynamic Latent Dependence Analysis for Detection of Zero Day Vulnerability". In Information Security and Cryptology - ICISC 2011, 140–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31912-9_10.

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Gorawski, Marcin, Damian Lis e Michal Gorawski. "The Use of a Cloud Computing and the CUDA Architecture in Zero-Latency Data Warehouses". In Computer Networks, 312–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-38865-1_32.

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Atti di convegni sul tema "Zero latence"

Pratap, Jayanth, Siyeop Yoon, Wen-Chih Liu, Quanzheng Li, Abhiram Bhashyam, Neal Chen e Xiang Li. "Zero-Shot Novel View Synthesis of Wrist X-Rays Using Latent Diffusion Model". In 2024 IEEE International Symposium on Biomedical Imaging (ISBI), 1–4. IEEE, 2024. http://dx.doi.org/10.1109/isbi56570.2024.10635244.

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Xia, Haijun, Ricardo Jota, Benjamin McCanny, Zhe Yu, Clifton Forlines, Karan Singh e Daniel Wigdor. "Zero-latency tapping". In UIST '14: The 27th Annual ACM Symposium on User Interface Software and Technology. New York, NY, USA: ACM, 2014. http://dx.doi.org/10.1145/2642918.2647348.

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Trivisonno, R., R. Guerzoni, I. Vaishnavi e D. Soldani. "Towards zero latency Software Defined 5G Networks". In 2015 ICC - 2015 IEEE International Conference on Communications Workshops (ICC). IEEE, 2015. http://dx.doi.org/10.1109/iccw.2015.7247564.

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Engelberg, Shlomo, e Osnat Keren. "Zero-latency zero-error codes for parallel asynchronous channels with arbitrary skews". In 2015 IEEE Information Theory Workshop (ITW). IEEE, 2015. http://dx.doi.org/10.1109/itw.2015.7133092.

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Palovuori, Karri, e Ismo Rakkolainen. "Ballistic Tracking - A True Zero Latency Gaming Interface". In International Conference. New York, New York, USA: ACM Press, 2013. http://dx.doi.org/10.1145/2523429.2523441.

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Vijayaratnam, Melan, Marco Cagnazzo, Giuseppe Valenzise, Anthony Trioux e Michel Kieffer. "Towards Zero-Latency Video Transmission Through Frame Extrapolation". In 2022 IEEE International Conference on Image Processing (ICIP). IEEE, 2022. http://dx.doi.org/10.1109/icip46576.2022.9897958.

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Xian, Yongqin, Zeynep Akata, Gaurav Sharma, Quynh Nguyen, Matthias Hein e Bernt Schiele. "Latent Embeddings for Zero-Shot Classification". In 2016 IEEE Conference on Computer Vision and Pattern Recognition (CVPR). IEEE, 2016. http://dx.doi.org/10.1109/cvpr.2016.15.

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MolavianJazi, Ebrahim, e Aylin Yener. "Low-Latency Communications over Zero-Battery Energy Harvesting Channels". In GLOBECOM 2015 - 2015 IEEE Global Communications Conference. IEEE, 2014. http://dx.doi.org/10.1109/glocom.2014.7417604.

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Austin, T. M., e G. S. Sohi. "Zero-cycle loads: microarchitecture support for reducing load latency". In Proceedings of MICRO'95: 28th Annual IEEE/ACM International Symposium on Microarchitecture. IEEE, 1995. http://dx.doi.org/10.1109/micro.1995.476815.

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Kim, Byoung Chul, e In Suk Chun. "Zero Latency Queuing System Based on Deficit Round Robin". In 2007 16th International Conference on Computer Communications and Networks. IEEE, 2007. http://dx.doi.org/10.1109/icccn.2007.4317841.

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Rapporti di organizzazioni sul tema "Zero latence"

Anderson, James, e Penglong Zhang. Latent Exports: Almost Ideal Gravity and Zeros. Cambridge, MA: National Bureau of Economic Research, dicembre 2020. http://dx.doi.org/10.3386/w28278.

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Willits, Daniel H., Meir Teitel, Josef Tanny, Mary M. Peet, Shabtai Cohen e Eli Matan. Comparing the performance of naturally ventilated and fan-ventilated greenhouses. United States Department of Agriculture, marzo 2006. http://dx.doi.org/10.32747/2006.7586542.bard.

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The objectives of this project were to predict the performance of naturally and fan-ventilated greenhouses as a function of climate, type of crop, evaporative cooling and greenhouse size, and to estimate the effects of the two cooling systems on yield, quality and disease development in the different crops under study. Background In the competitive field of greenhouse cultivation, growers and designers in both the US and Israel are repeatedly forced to choose between naturally ventilated (NV) and fan ventilated (FV) cooling systems as they expand their ranges in an effort to remain profitable. The known advantages and disadvantages of each system do not presently allow a clear decision. Whether essentially zero operating costs can offset the less dependable cooling of natural ventilation systems is question this report hopes to answer. Major Conclusions US It was concluded very early on that FV greenhouses without evaporative pad cooling are not competitive with NV greenhouses during hot weather. During the first year, the US team found that average air temperatures were always higher in the FV houses, compared to the NV houses, when evaporative pad cooling was not used, regardless of ventilation rate in the FV houses or the vent configuration in the NV houses. Canopy temperatures were also higher in the FV ventilated houses when three vents were used in the NV houses. A second major conclusion was that the US team found that low pressure fogging (4 atm) in NV houses does not completely offset the advantage of evaporative pad cooling in FV houses. High pressure fog (65 atm) is more effective, but considerably more expensive. Israel Experiments were done with roses in the years 2003-2005 and with tomatoes in 2005. Three modes of natural ventilation (roof, side and side + roof openings) were compared with a fan-ventilated (with evaporative cooling) house. It was shown that under common practice of fan ventilation, during summer, the ventilation rate is usually lower with NV than with FV. The microclimate under both NV and FV was not homogeneous. In both treatments there were strong gradients in temperature and humidity in the vertical direction. In addition, there were gradients that developed in horizontal planes in a direction parallel to the direction of the prevailing air velocity within the greenhouse. The gradients in the horizontal direction appear to be larger with FV than with NV. The ratio between sensible and latent heat fluxes (Bowen ratio) was found to be dependent considerably on whether NV or FV is applied. This ratio was generally negative in the naturally ventilated house (about -0.14) and positive in the fan ventilated one (about 0.19). Theoretical models based on Penman-Monteith equation were used to predict the interior air and crop temperatures and the transpiration rate with NV. Good agreement between the model and experimental results was obtained with regard to the air temperature and transpiration with side and side + roof ventilation. However, the agreement was poor with only roof ventilation. The yield (number of rose stems longer than 40 cm) was higher with FV

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