358 research outputs found
Oscillation of Third-Order Neutral Delay Differential Equations
The purpose of this paper is to examine oscillatory properties of the third-order neutral delay differential equation [a(t)(b(t)(x(t)+p(t)x(Ļ(t)))ā²)ā²]ā²+q(t)x(Ļ(t))=0. Some oscillatory and asymptotic criteria are presented. These criteria improve and complement those results in the literature. Moreover, some examples are given to illustrate the main results
RazliÄiti utjecaji latentne topline u planetarnom graniÄnom sloju i mikrofiziÄkih procesa u oblacima na tajfun Sarika (2016)
Three simulation experiments were conducted on Typhoon (TC) āSarikaā (2016) using the WRF model, different effects of the latent heat in planetary boundary layer and cloud microphysical process on the TC were investigated. The control experiment well simulated the changes in TC track and intensity. The latent heat in planetary boundary layer or cloud microphysics process can affect the TC track and moving speed. Latent heat affects the TC strength by affecting the TC structure. Compared with the CTL experiment, both the NBL experiment and the NMP experiment show weakening in dynamics and thermodynamics characteristics of TC. Without the effect of latent heat, the TC cannot develop upwards and thus weakens in its intensity and reduces in precipitation; this weakening effect appears to be more obvious in the case of closing the latent heat in planetary boundary layer. The latent heat in planetary boundary layer mainly influences the generation and development of TC during the beginning stage, whereas the latent heat in cloud microphysical process is conducive to the strengthen and maintenance of TC in the mature stage. The latent heat energy of the cloud microphysical process in the TC core region is an order of magnitude larger than the surface enthalpy. But the latent heat release of cloud microphysical processes is not the most critical factor for TC enhancement, while the energy transfer of boundary layer processes is more important.Kako bi se ispitali razliÄiti utjecaji latentne topline u planetarnom graniÄnom sloju i mikrofiziÄkih procesa u oblacima, WRF modelom su provedena tri eksperimenta za tajfun (TC) āSarikaā (2016). Kontrolnim eksperimentom dobro su simulirane promjene intenziteta i putanja TC-a. Latentna toplina u planetarnom graniÄnom sloju te mikrofiziÄki procesi u oblacima mogu utjecati na putanju TC i na brzinu njegovog gibanja. Latentna toplina utjeÄe na jaÄinu TC-a putem promjene strukture TC-a. U usporedbi s CTL eksperimentom i NBL i NMP eksperiment ukazuju na slabljenje dinamike i termodinamiÄkih svojstava TC-a. Bez utjecaja latentne topline TC se ne može vertikalno razvijati i stoga mu intenzitet slabi, a koliÄina oborine se reducira; to slabljenje je oÄitije u sluÄaju kada je latentna toplina ograniÄena na planetarni graniÄni sloj.
Latentna toplina u planetarnom graniÄnom sloju uglavnom utjeÄe na stvaranje i razvoj TC-a u poÄetnoj fazi, dok latentna toplina vezana za mikrofiziÄke procese u oblaku pogoduje jaÄanju i održavanju njegove zrele faze. Latentna toplina mikrofiziÄkih procesa u oblakcima u jezgri TC-a je za red veliÄine veÄa od prizemne entalpije. MeÄutim, oslobaÄanje latentne topline pri mikrofiziÄkim procesima u oblacima nije najvažnije za jaÄanje TC-a, veÄ je za njegovo jaÄanje važniji transfer energije u procesima planetarnog graniÄnog sloja.
Properties of higher-order half-linear functional differential equations with noncanonical operators
RHFedMTL: Resource-Aware Hierarchical Federated Multi-Task Learning
The rapid development of artificial intelligence (AI) over massive
applications including Internet-of-things on cellular network raises the
concern of technical challenges such as privacy, heterogeneity and resource
efficiency.
Federated learning is an effective way to enable AI over massive distributed
nodes with security.
However, conventional works mostly focus on learning a single global model
for a unique task across the network, and are generally less competent to
handle multi-task learning (MTL) scenarios with stragglers at the expense of
acceptable computation and communication cost. Meanwhile, it is challenging to
ensure the privacy while maintain a coupled multi-task learning across multiple
base stations (BSs) and terminals. In this paper, inspired by the natural
cloud-BS-terminal hierarchy of cellular works, we provide a viable
resource-aware hierarchical federated MTL (RHFedMTL) solution to meet the
heterogeneity of tasks, by solving different tasks within the BSs and
aggregating the multi-task result in the cloud without compromising the
privacy. Specifically, a primal-dual method has been leveraged to effectively
transform the coupled MTL into some local optimization sub-problems within BSs.
Furthermore, compared with existing methods to reduce resource cost by simply
changing the aggregation frequency,
we dive into the intricate relationship between resource consumption and
learning accuracy, and develop a resource-aware learning strategy for local
terminals and BSs to meet the resource budget. Extensive simulation results
demonstrate the effectiveness and superiority of RHFedMTL in terms of improving
the learning accuracy and boosting the convergence rate.Comment: 11 pages, 8 figure
NetGPT: A Native-AI Network Architecture Beyond Provisioning Personalized Generative Services
Large language models (LLMs) have triggered tremendous success to empower
daily life by generative information, and the personalization of LLMs could
further contribute to their applications due to better alignment with human
intents. Towards personalized generative services, a collaborative cloud-edge
methodology sounds promising, as it facilitates the effective orchestration of
heterogeneous distributed communication and computing resources. In this
article, after discussing the pros and cons of several candidate cloud-edge
collaboration techniques, we put forward NetGPT to capably deploy appropriate
LLMs at the edge and the cloud in accordance with their computing capacity. In
addition, edge LLMs could efficiently leverage location-based information for
personalized prompt completion, thus benefiting the interaction with cloud
LLMs. After deploying representative open-source LLMs (e.g., GPT-2-base and
LLaMA model) at the edge and the cloud, we present the feasibility of NetGPT on
the basis of low-rank adaptation-based light-weight fine-tuning. Subsequently,
we highlight substantial essential changes required for a native artificial
intelligence (AI) network architecture towards NetGPT, with special emphasis on
deeper integration of communications and computing resources and careful
calibration of logical AI workflow. Furthermore, we demonstrate several
by-product benefits of NetGPT, given edge LLM's astonishing capability to
predict trends and infer intents, which possibly leads to a unified solution
for intelligent network management \& orchestration. In a nutshell, we argue
that NetGPT is a promising native-AI network architecture beyond provisioning
personalized generative services
Circulating tissue factor-positive procoagulant microparticles in patients with type 1 diabetes
Aim: To investigate the count of circulating tissue factor-positive (TF+) procoagulant microparticles (MPs) in patients with type 1 diabetes mellitus (T1DM). Methods: This case-control study included patients with T1DM and age and sex-matched healthy volunteers. The counts of phosphatidylserine-positive (PS+) MPs and TF(+)PS(+)MPs and the subgroups derived from different cell types were measured in the peripheral blood sample of the two groups using multicolor flow cytometric assay. We compared the counts of each MP between groups as well as the ratio of the TF(+)PS(+)MPs and PS(+)MPs (TF(+)PS(+)MPs/PS(+)MPs). Results: We recruited 36 patients with T1DM and 36 matched healthy controls. Compared with healthy volunteers, PS(+)MPs, TF(+)PS(+)MPs and TF(+)PS(+)MPs/PS(+)MPs were elevated in patients with T1DM (PS(+)MPs: 1078.5 +/- 158.08 vs 686.84 +/- 122.04/mu L, P <0.001; TF(+)PS(+)MPs: 202.10 +/- 47.47 vs 108.33 +/- 29.42/mu L, P <0.001; and TF(+)PS(+)MPs/PS(+)MPs: 0.16 +/- 0.04 vs 0.19 +/- 0.05, P = 0.004), mostly derived from platelet, lymphocytes and endothelial cells. In the subgroup analysis, the counts of total and platelet TF(+)PS(+)MPs were increased in patients with diabetic retinopathy (DR) and with higher HbA1c, respectively. Conclusion: Circulating TF(+)PS(+)MPs and those derived from platelet, lymphocytes and endothelial cells were elevated in patients with T1DM.De tre fƶrsta fƶrfattarna delar fƶrstafƶrfattarskapet.</p
Communication-Efficient Cooperative Multi-Agent PPO via Regulated Segment Mixture in Internet of Vehicles
Multi-Agent Reinforcement Learning (MARL) has become a classic paradigm to
solve diverse, intelligent control tasks like autonomous driving in Internet of
Vehicles (IoV). However, the widely assumed existence of a central node to
implement centralized federated learning-assisted MARL might be impractical in
highly dynamic scenarios, and the excessive communication overheads possibly
overwhelm the IoV system. Therefore, in this paper, we design a communication
efficient cooperative MARL algorithm, named RSM-MAPPO, to reduce the
communication overheads in a fully distributed architecture. In particular,
RSM-MAPPO enhances the multi-agent Proximal Policy Optimization (PPO) by
incorporating the idea of segment mixture and augmenting multiple model
replicas from received neighboring policy segments. Afterwards, RSM-MAPPO
adopts a theory-guided metric to regulate the selection of contributive
replicas to guarantee the policy improvement. Finally, extensive simulations in
a mixed-autonomy traffic control scenario verify the effectiveness of the
RSM-MAPPO algorithm
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