scholarly journals Towards Dependable IoT via Interface Selection: Predicting Packet Delivery at the End Node in LoRaWAN Networks

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2707
Author(s):  
Marc Guerrero ◽  
Cristina Cano ◽  
Xavier Vilajosana ◽  
Pascal Thubert
Keyword(s):  
Wireless Networks ◽  
Data Collection ◽  
Protocol Stack ◽  
Control Plane ◽  
Practical Application ◽  
Packet Delivery ◽  
Extensive Data ◽  
Channel Conditions ◽  
End Node ◽  
Different Levels

Estimating channel conditions to predict packet delivery can be exploited as a powerful tool to ensure wireless networks dependability. In this article we explore the practical application of this idea from the end-device perspective, using the LoRaWAN protocol stack. We aim to understand if packet delivery can be estimated considering different levels of feedback at the end-device. For that, an extensive data collection campaign is carried out. Through an analysis of the obtained traces, we establish correlations between connectivity metrics at the end node and the fact that a packet is received at the gateway. The study is complemented considering different levels of feedback: (i) No feedback, (ii) enabling acknowledgements frames, and (iii) considering application/control plane data about the channel status at the gateway side. The results show that it is possible to estimate packet delivery in all the evaluated cases.

Re-appraising and Re-classifying: a New Look at the Corpus of Miniature Socketed Axes from Britain

2020 ◽  
Vol 75 (1) ◽  
pp. 1-27
Author(s):  
Alex Bliss
Keyword(s):  
Spatial Distribution ◽  
Data Collection ◽  
Detailed Analysis ◽  
Significant Proportion ◽  
Direct Result ◽  
Object Type ◽  
England And Wales ◽  
Extensive Data ◽  
Metal Artefacts ◽  
The Subject

The advent of the Portable Antiquities Scheme (PAS) has added a great deal to our understanding of prehistoric metal artefacts in England and Wales, namely in expanding enormously the corpuses of objects previously thought to be quite scarce. One such artefact type is the miniature socketed 'votive' axe, most of which are found in Wiltshire and Hampshire. As a direct result of developing such recording initiatives, reporting of these artefacts as detector finds from the early 2000s onwards has virtually trebled the number originally published by Paul Robinson in his 1995 analysis. Through extensive data-collection, synthesising examples recorded via the PAS with those from published excavations, the broad aims of this paper (in brief) are as follows: firstly, produce a solid typology for these artefacts; secondly, investigate their spatial distribution across England and Wales. As a more indirect third aim, this paper also seeks to redress the imbalance of focus and academic study specifically applying to Hampshire finds of this object type, which despite producing a significant proportion of the currently known corpus have never been the subject of detailed analysis.

scholarly journals A Survey on Machine Learning-Based Performance Improvement of Wireless Networks: PHY, MAC and Network Layer

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 318
Author(s):  
Merima Kulin ◽  
Tarik Kazaz ◽  
Eli De Poorter ◽  
Ingrid Moerman
Keyword(s):  
Machine Learning ◽  
Wireless Networks ◽  
Performance Improvement ◽  
Quality Of Experience ◽  
Data Driven ◽  
Protocol Stack ◽  
Comprehensive Survey ◽  
Network Prediction ◽  
Network Quality

This paper presents a systematic and comprehensive survey that reviews the latest research efforts focused on machine learning (ML) based performance improvement of wireless networks, while considering all layers of the protocol stack: PHY, MAC and network. First, the related work and paper contributions are discussed, followed by providing the necessary background on data-driven approaches and machine learning to help non-machine learning experts understand all discussed techniques. Then, a comprehensive review is presented on works employing ML-based approaches to optimize the wireless communication parameters settings to achieve improved network quality-of-service (QoS) and quality-of-experience (QoE). We first categorize these works into: radio analysis, MAC analysis and network prediction approaches, followed by subcategories within each. Finally, open challenges and broader perspectives are discussed.

scholarly journals Hitchhike: A Preamble-Based Control Plane for SNR-Sensitive Wireless Networks

2016 ◽  
Vol 15 (2) ◽  
pp. 1239-1251 ◽  
Author(s):  
Xiaoyu Ji ◽  
Jiliang Wang ◽  
Mingyan Liu ◽  
Yubo Yan ◽  
Panlong Yang ◽  
...  
Keyword(s):  
Wireless Networks ◽  
Control Plane

scholarly journals Efecto de la Escolarización en la Producción de Relaciones Causales y Contracausales: Evidencia Psicolingüística para el Ámbito Educativo

2016 ◽  
Vol 6 (3) ◽  
pp. 258
Author(s):  
Gabriela Mariel Zunino
Keyword(s):  
Empirical Evidence ◽  
Language Processing ◽  
Formal Education ◽  
Educational Process ◽  
Semantic Relations ◽  
Practical Application ◽  
Discourse Comprehension ◽  
Educational Processes ◽  
Different Characteristics ◽  
Different Levels

In order to promote the practical application of psycholinguistic data in educational fields and expecting that this transfer would enhance the development of both the pedagogical field and the investigation in experimental psycholinguistics, we present two experiments to analyse the production of semantic relations in discourse, especially the causality/countercausality dimension. We found that the pattern of causal advantage is cross-wise and consistent in subjects with different levels of formal education, so it could be a suitable scaffold to develop other aspects of discourse comprehension and production. We compare our results with previous findings about discourse comprehension and interpret the data in the framework of educational processes. To use of empirical evidence about language processing on educational fields allows not only to review specific issues such as the characteristics of teaching materials, but also to improve educational process in a comprehensive way, making possible to adapt different approaches to populations with different characteristics.

scholarly journals Ambidestralidade organizacional em instituições de ensino superior: proposição de estágios evolutivos de ambidestria

2021 ◽  
Vol 14 (1) ◽  
pp. 100-118
Author(s):  
Juliano Lima Soares ◽  
Dálcio Roberto dos Reis
Keyword(s):  
Higher Education ◽  
Data Collection ◽  
Research Methodology ◽  
Higher Education Institutions ◽  
Descriptive Study ◽  
Degree Of Maturity ◽  
Different Levels

Purpose  – The general objective of the research was to propose evolutionary stages of organizational ambidexterity.Design/methodology/approach – The research methodology was classified as an exploratory and descriptive study, whose method of data collection was through a questionnaire, the sample was census by adherence, from a population of 110 higher education institutions (HEI), participating in the study 79 cases, distributed throughout the Brazilian territory.Findings  – It is noteworthy that HEI are part of the same economic group, and even though 96% of the cases were classified as ambidextrous organizations, there was a great dispersion between them, suggesting some heterogeneity of the investigated cases. Originality – With the findings, the proposition of the existence of different levels of ambidexterity arose. This phenomenon, in a preliminary way, was labeled as the Degree of Maturity of Ambidextrous Organizational

scholarly journals An Enhanced Underwater Linear Wireless Sensor Network Deployment Strategy for Data Collection

2018 ◽  
Vol 8 (3) ◽  
Author(s):  
Zahoor Ahmed ◽  
Kamalrulnizam Abu Bakar
Keyword(s):  
Wireless Sensor Network ◽  
Data Collection ◽  
Sensor Network ◽  
Research Work ◽  
Sensor Nodes ◽  
Wireless Sensor ◽  
Delivery Ratio ◽  
Packet Delivery ◽  
Deployment Strategy ◽  
Underwater Pipeline

The deployment of Linear Wireless Sensor Network (LWSN) in underwater environment has attracted several research studies in the underwater data collection research domain. One of the major issues in underwater data collection is the lack of robust structure in the deployment of sensor nodes. The challenge is more obvious when considering a linear pipeline that covers hundreds of kilometers. In most of the previous work, nodes are deployed not considering heterogeneity and capacity of the various sensor nodes. This lead to the problem of inefficient data delivery from the sensor nodes on the underwater pipeline to the sink node at the water surface. Therefore, in this study, an Enhanced Underwater Linear Wireless Sensor Network Deployment (EULWSND) has been proposed in order to improve the robustness in linear sensor underwater data collection. To this end, this paper presents a review of related literature in an underwater linear wireless sensor network. Further, a deployment strategy is discussed considering linearity of the underwater pipeline and heterogeneity of sensor nodes. Some research challenges and directions are identified for future research work. Furthermore, the proposed deployment strategy is implemented using AQUASIM and compared with an existing data collection scheme. The result demonstrates that the proposed EULWSND outperforms the existing Dynamic Address Routing Protocol for Pipeline Monitoring (DARP-PM) in terms of overhead and packet delivery ratio metrics. The scheme performs better in terms of lower overhead with 17.4% and higher packet delivery with 20.5%.

The Limits of Shared Panethnic Status: Considering Culture, Age, and Language in Qualitative Research

2021 ◽  
pp. 016059762110329
Author(s):  
Trisha J. Tiamzon ◽  
Miho Iwata ◽  
Shweta Majumdar Adur
Keyword(s):  
Qualitative Research ◽  
Data Collection ◽  
Qualitative Study ◽  
Cultural Competence ◽  
Asian Americans ◽  
Cultural Norms ◽  
Culture Age ◽  
Research Participants ◽  
Data Collection And Analysis ◽  
Different Levels

The increase of qualitative research in gerontology invites discussion of the effects of researcher positionality on data collection and analysis. Analyses of the interviewing experiences of three researchers who conducted a qualitative study of aging Asian Americans illustrate the complexities of negotiating “insider” status. Despite the interviewers’ shared panethnic status (Asian) with the participants, they experienced different levels of insider status, which were based, in part, on cultural competence related to cultural norms and practices, age hierarchies, and language. This suggests that qualitative researchers should engage in reflexive practices that consider researcher positionality in relation to research participants. Researchers need to pay attention to the possible implications of cultural competence on negotiating insider status and when gathering and analyzing data, similar to considerations of culturally relevant approaches in practical settings.

Event Detection in Wireless Sensor Networks

2012 ◽  
pp. 226-238
Author(s):  
Sohail Anwar ◽  
Chongming Zhang
Keyword(s):  
Wireless Sensor Networks ◽  
Wireless Networks ◽  
Sensor Networks ◽  
Data Collection ◽  
Event Detection ◽  
Wireless Sensor ◽  
Comprehensive Overview ◽  
Detection Mechanism ◽  
Detection Techniques ◽  
The World

Wireless Sensor Networks (WSNs) have experienced an amazing evolution during the last decade. Compared with other wired or wireless networks, wireless sensor networks extend the range of data collection and make it possible for us to get information from every corner of the world. The chapter begins with an introduction to WSNs and their applications. The chapter recognizes event detection as a key component for WSN applications. The chapter provides a structured and comprehensive overview of various techniques used for event detection in WSNs. Existing event detection techniques have been grouped into threshold based and pattern based mechanisms. For each category of event detection mechanism, the chapter surveys some representative technical schemes. The chapter also provides some analyses on the relative strengths and weaknesses of these technical schemes. Towards the end, the trends in the research regarding the event detection in WSNs are described.

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