Search results for "Network"

Sell in good company : social capital as a strategic tool in the fine art auction business

2013

Anomaly Detection and Classification of Household Electricity Data : A Time Window and Multilayer Hierarchical Network Approach

2022

With the increasing popularity of the smart grid, huge volumes of data are gathered from numerous sensors. How to classify, store, and analyze massive datasets to facilitate the development of the smart grid has recently attracted much attention. In particular, with the popularity of household smart meters and electricity monitoring sensors, a large amount of data can be obtained to analyze household electricity usage so as to better diagnose the leakage and theft behaviors, identify man-made tampering and data fraud, and detect powerline loss. In this paper, the time window method is first proposed to obtain the features and potential periodicity of household electricity data. Combining th…

Multicenter Consistency Assessment of Valvular Flow Quantification With Automated Valve Tracking in 4D Flow CMR

2021

OBJECTIVES This study determined: 1) the interobserver agreement; 2) valvular flow variation; and 3) which variables independently predicted the variation of valvular flow quantification from 4-dimensional (4D) flow cardiac magnetic resonance (CMR) with automated retrospective valve tracking at multiple sites. BACKGROUND Automated retrospective valve tracking in 4D flow CMR allows consistent assessment of valvular flow through all intracardiac valves. However, due to the variance of CMR scanners and protocols, it remains uncertain if the published consistency holds for other clinical centers. METHODS Seven sites each retrospectively or prospectively selected 20 subjects who underwent whole …

Trusted educational networks for the internationalization of open educational resources

2013

Global educational programs have become increasingly important in Higher Education and the training sector. One promising means of global collaboration is the use of Open Educational Resources (OERs). However, this opportunity has been slow to catch on, even though millions of learning objects are freely available around the world. This paper discusses key barriers to the use of OERs, and gives recommendations for better use of materials in international collaborations. A special focus is on the development of Trusted Educational Networks, and their use within recommendation mechanisms to enhance sharing in communities of trusted colleagues. peerReviewed

Community-based method for extracting backbones

2022

Networks are an adequate representation for modeling and analyzing a great variety of complex systems. However, understanding networks with millions of nodes and billions of connections can be pretty challenging due to memory and time constraints. Therefore, selecting the relevant nodes and edges of these large-scale networks while preserving their core information is a major issue. In most cases, the so-called backbone extraction methods are based either on coarse-graining or filtering approaches. Coarse-graining techniques reduce the network size by gathering similar nodes into super-nodes, while filter-based methods eliminate nodes or edges according to a statistical property. In this wo…

Dynamic MAC Parameters Configuration for Performance Optimization in 802.11e Networks

2006

Quality of service support in wireless LAN is a theme of current interest. Several solutions have been proposed in literature in order to protect time-sensitive traffic from best-effort traffic. According to the EDCA proposal, which is a completely distributed solution, the service differentiation is provided by giving probabilistically higher number of channel accesses to stations involved in real-time applications. To this purpose, the MAC parameter settings of each contending stations can be tuned dynamically. In this paper, we face the problem of tuning the EDCA MAC parameters in common scenarios in which a given number of low-rate delay-sensitive traffic flows share the channel with so…

Remarks on IEEE 802.11 DCF Performance Evaluation, IEEE Communication Letters, Vol. 9, Issue 8, Aug 2005 pp:765 - 767

2005

This letter presents a new approach to evaluate the throughput/delay performance of the 802.11 Distributed Coordination Function (DCF). Our approach relies on elementary conditional probability arguments rather than bidimensional Markov chains (as proposed in previous models), and can be easily extended to account for backoff operation more general than DCF's one

On the accuracy of some common modeling assumptions for EDCA analysis

2005

Several models have been discussed in literature in order to evaluate the performance of the EDCA differentiation mechanisms. Despite of the exponential back off rules, usually the EDCA protocol has been modeled as a persistent slotted access protocol, and summarized into a set of access probabilities. These models often show a very different complexity and accuracy, according to the basis assumptions. In this paper, we propose a new modeling approach for EDCA, in which the medium access is described in terms of backoff counter comparisons, contention by contention, and no restrictive hypothesis is considered. Through our model, we verify the applicability of the most common protocol simpli…

Kapitał społeczny w zrównoważonym rozwoju regionu opolskiego na przykładzie badań w towarowych gospodarstwach rolnych / Social capital in balanced de…

2016

Kolejna transformacja kapitalizmu, wspierana narzędziami społeczeństwa informacyjnego, zakłada wiele endogenicznych zmian technologicznych wprowadzanych z uwzględnieniem środowiska instytucjonalnego służącego rozwojowi zrównoważonemu. Taka forma globalizacji potrzebuje lokalności, także tej kryjącej się w rolnictwie i na obszarach wiejskich, i stanowi szanse ich rozwoju. W artykule uzasadniana jest teza, że sieci społeczne rolników i ich powiązania międzyorganizacyjne stanowią warunek takiej zmiany, o ile służą zapewnieniu trwałości kapitału naturalnego, finansowego i ludzkiego. W pracy analizowane są wyniki badań kwestionariuszowych dotyczących zrównoważonego rozwoju towarowych gospodarstw…

Quality, Reliability, Security and Robustness in Heterogeneous Systems

2020

This book constitutes the refereed post-conference proceedings of the 15th EAI International Conference on Quality, Reliability, Security and Robustness in Heterogeneous Networks, QShine 2019, held in Shenzhen, China, in November 2019. The 16 revised full papers were carefully reviewed and selected from 55 submissions. The papers are organized thematically in tracks, starting with mobile systems, cloud resource management and scheduling, machine learning, telecommunication systems, and network management.