Search results for "network"
showing 10 items of 7718 documents
Alleviating Class Imbalance Problem in Automatic Sleep Stage Classification
2022
For real-world automatic sleep-stage classification tasks, various existing deep learning-based models are biased toward the majority with a high proportion. Because of the unique sleep structure, most of the current polysomnography (PSG) datasets suffer an inherent class imbalance problem (CIP), in which the number of each sleep stage is severely unequal. In this study, we first define the class imbalance factor (CIF) to describe the level of CIP quantitatively. Afterward, we propose two balancing methods to alleviate this problem from the dataset quantity and the relationship between the class distribution and the applied model, respectively. The first one is to employ the data augmentati…
Advanced performance monitoring for self-healing cellular mobile networks
2015
This dissertation is devoted to development and validation of advanced per- formance monitoring system for existing and future cellular mobile networks. Knowledge mining techniques are employed for analysis of user specific logs, collected with Minimization of Drive Tests (MDT) functionality. Ever increas- ing quality requirements, expansion of the mobile networks and their extend- ing heterogeneity, call for effective automatic means of performance monitoring. Nowadays, network operation is mostly controlled manually through aggregated key performance indicators and statistical profiles. These methods are are not able to fully address the dynamism and complexity of modern mobile networks. Se…
A Telemetry, Tracking, and Command Antennas System for Small-Satellite Applications
2019
Circularly polarized (CP) antennas are used in space applications for telemetry tracking and command (TT&
Les agglomérations celtiques pré-Conquête en Gaule du Centre-Est. Apport des travaux du PCR « agglomérations antiques de Bourgogne, Franche-Comté et …
2019
Depuis les années 1980, l'étude du fait urbain antique est l'une des questions les plus étudiée sur le territoire des dix départements formant le centre-est de la France. Le développement d'un programme collectif de recherche sur ce thème en 2012 a permis d'en dresser un nouvel inventaire et de rassembler une donnée souvent disparate. Ces travaux ont plus particulièrement porté attention aux phases initiales de mise en place du réseau urbain, en tentant, à l'aide de ces données et de nouvelles prospections, de disposer d'une vision évolutive des sites les plus marquants. Malgré les grandes difficultés méthodologiques et documentaires rencontrées, il apparaît assez nettement que la période a…
On the use of composite indicators for mobile communications network management in smart sustainable cities
2020
Beyond 5G networks will be fundamental towards enabling sustainable mobile communication networks. One of the most challenging scenarios will be met in ultra-dense networks that are deployed in densely populated areas. In this particular case, mobile network operators should benefit from new assessment metrics and data science tools to ensure an effective management of their networks. In fact, incorporating architectures allowing a cognitive network management framework could simplify processes and enhance the network&rsquo
Characterization of IP-Based Communication for Smart Grid Using Software-Defined Networking
2018
The smart grid (SG) approach is based on a strong interaction between the network communication infrastructure and the power grid. Usually the management of the infrastructure is done by the distribution system operators (DSOs) that are worried about the increasing managing complexity due to the presence of increasing number of distributed energy resources and electrical vehicles. The use of software-defined networking (SDN) may simplify the network configuration and management for DSO, as highlighted from previous research works. The objective of this paper is to introduce and characterize an internet protocol (IP)-based communication architecture with specialized SDN bridges operating als…
The Smart Land Paradigm in the Sicani Territorial Archipelago
2017
With the aim to identify the specific identities of the Sicani territory, to interpret them in a perspective of innovative development and to define strategies capable of intercepting programming in progress, it has been deepened the “territorial archipelago” theoretical framework , recognizing it into the Sicani territory and trying to use it as the base of a possible development of a Smart Land, as a “non-gravitational” paradigm able to recognize and to direct the new relations of the rur-urban local systems.
Enhancing the Iterative Smoothed Particle Hydrodynamics Method
2021
Motivated by recent research on the iterative approach proposed for the smoothed particle hydrodynamics (ISPH) method, some ideas to improve the process are introduced. The standard procedure is enhanced iterating on the residuals preserving the matrix-free nature of the process. The method is appealing providing reasonable results with disordered data distribution too and no kernel variations are needed in the approximation. This work moves forward with a novel formulation requiring a lower number of iterations to reach a desired accuracy. The computational procedure is described and some results are introduced to appreciate the proposed formulation.
Antennal lobe representations are optimized when olfactory stimuli are periodically structured to simulate natural wing beat effects
2014
Animals use behaviors to actively sample the environment across a broad spectrum of sensory domains. These behaviors discretize the sensory experience into unique spatiotemporal moments, minimize sensory adaptation, and enhance perception. In olfaction, behaviors such as sniffing, antennal flicking, and wing beating all act to periodically expose olfactory epithelium. In mammals, it is thought that sniffing enhances neural representations; however, the effects of insect wing beating on representations remain unknown. To determine how well the antennal lobe produces odor-dependent representations when wing beating effects are simulated, we used extracellular methods to record neural units an…
NETWORK ANALYSIS OF A TOURIST DESTINATION
2014
This paper relates to the study of relationships within a tourist destination in order to prove the existence of structural models around which the entire supply system is developed. All this is made possible by the analysis of the links existing between businesses belonging to the destination. A useful tool for this purpose is Social Network Analysis (SNA), which provides a series of indicators and techniques to study the complexity of the network of relationships within a tourist destination and allows identifying the existence of a possible reference framework that can characterize the specificity of the destination. Based on the results from a previous analysis carried out in the San Vi…