scholarly journals Integration of Steerable Smart Antennas to IETF 6TiSCH Protocol for High Reliability Wireless IoT Networks

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Sercan Kulcu ◽  
Sedat Gormus ◽  
Yichao Jin
Keyword(s):  
High Reliability ◽  
Smart Antennas

scholarly journals Integration of Steerable Smart Antennas to IETF 6TiSCH Protocol for High Reliability Wireless IoT Networks

2021 ◽  
Author(s):  
Sercan Kulcu ◽  
Sedat Gormus ◽  
Yichao Jin
Keyword(s):  
Smart Antenna ◽  
High Reliability ◽  
Smart Antennas ◽  
Low Complexity ◽  
Network Capacity ◽  
Directional Antennas ◽  
Seamless Integration ◽  
Delivery Performance ◽  
Industrial Iot ◽  
Overall Performance

Steerable directional antennas are increasingly utilised to improve the overall performance of the traditional wireless sensor networks. Steerable directional antenna based networking solutions increase the network capacity by providing a longer range of transmission and reduced interference as compared to networking solutions with omni-directional antennas. However, the use of smart antennas requires complex algorithms and such algorithms may not be easily leveraged in low power Internet of Things (IoT) networks. This study presents mechanisms for integrating low complexity smart antenna solutions into IETF 6TiSCH protocol with the aim of creating scalable and reliable industrial IoT networks. The solution defines extensions to MAC layer and scheduling mechanisms of IETF 6TiSCH protocol to enable its seamless integration with low complexity steerable smart antennas. The results of this study show that smart antenna enabled 6TiSCH protocol stack outperforms the legacy 6TiSCH stack in terms of data delivery performance especially in high density scenarios.<br>

scholarly journals Integration of Steerable Smart Antennas to IETF 6TiSCH Protocol for High Reliability Wireless IoT Networks

2021 ◽  
Author(s):  
Sercan Kulcu ◽  
Sedat Gormus
Keyword(s):  
Smart Antenna ◽  
High Reliability ◽  
Smart Antennas ◽  
Low Complexity ◽  
Network Capacity ◽  
Directional Antennas ◽  
Seamless Integration ◽  
Delivery Performance ◽  
Industrial Iot ◽  
Overall Performance

Smart antennas are increasingly utilised to improve the overall performance of the traditional wireless networks. Smart antenna based networking solutions increase the network capacity by providing a longer range of transmission and reducing interference as compared to networking solutions with omni-directional antennas. However, the use of smart antennas requires complex algorithms and such algorithms may not be easily leveraged in low power Internet of Things (IoT) networks. This study presents mechanisms for integrating low complexity smart antenna solutions into IETF 6TiSCH protocol with the aim of creating scalable and reliable industrial IoT networks. The solution defines extensions to MAC layer and scheduling mechanisms of IETF 6TiSCH protocol to enable its seamless integration with low complexity steerable smart antennas. The results of this study show that smart antenna enabled 6TiSCH protocol stack outperforms the legacy 6TiSCH stack in terms of data delivery performance especially in high density scenarios.<br>

scholarly journals Integration of Steerable Smart Antennas to IETF 6TiSCH Protocol for High Reliability Wireless IoT Networks

2021 ◽  
Author(s):  
Sercan Kulcu ◽  
Sedat Gormus
Keyword(s):  
Smart Antenna ◽  
High Reliability ◽  
Smart Antennas ◽  
Low Complexity ◽  
Network Capacity ◽  
Directional Antennas ◽  
Seamless Integration ◽  
Delivery Performance ◽  
Industrial Iot ◽  
Overall Performance

Smart antennas are increasingly utilised to improve the overall performance of the traditional wireless networks. Smart antenna based networking solutions increase the network capacity by providing a longer range of transmission and reducing interference as compared to networking solutions with omni-directional antennas. However, the use of smart antennas requires complex algorithms and such algorithms may not be easily leveraged in low power Internet of Things (IoT) networks. This study presents mechanisms for integrating low complexity smart antenna solutions into IETF 6TiSCH protocol with the aim of creating scalable and reliable industrial IoT networks. The solution defines extensions to MAC layer and scheduling mechanisms of IETF 6TiSCH protocol to enable its seamless integration with low complexity steerable smart antennas. The results of this study show that smart antenna enabled 6TiSCH protocol stack outperforms the legacy 6TiSCH stack in terms of data delivery performance especially in high density scenarios.<br>

Failure Analysis With the Scanning Electron Microscope

1972 ◽  
Vol 30 ◽  
pp. 482-483
Author(s):  
John R. Devaney
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Integrated Circuits ◽  
Failure Analysis ◽  
High Reliability ◽  
Military Applications ◽  
Small Structure ◽  
Useful Life ◽  
Insight Into ◽  
Scanning Electron

Occasionally in history, an event may occur which has a profound influence on a technology. Such an event occurred when the scanning electron microscope became commercially available to industry in the mid 60's. Semiconductors were being increasingly used in high-reliability space and military applications both because of their small volume but, also, because of their inherent reliability. However, they did fail, both early in life and sometimes in middle or old age. Why they failed and how to prevent failure or prolong “useful life” was a worry which resulted in a blossoming of sophisticated failure analysis laboratories across the country. By 1966, the ability to build small structure integrated circuits was forging well ahead of techniques available to dissect and analyze these same failures. The arrival of the scanning electron microscope gave these analysts a new insight into failure mechanisms.

Fuzzy multi-objective location and routing problem

2020 ◽  
Vol 39 (3) ◽  
pp. 3259-3273
Author(s):  
Nasser Shahsavari-Pour ◽  
Najmeh Bahram-Pour ◽  
Mojde Kazemi
Keyword(s):  
Firefly Algorithm ◽  
High Reliability ◽  
Research Area ◽  
Nsga Ii ◽  
Location Routing Problem ◽  
Routing Problem ◽  
Location Allocation ◽  
Multi Objective ◽  
Location Routing ◽  
The Cost

The location-routing problem is a research area that simultaneously solves location-allocation and vehicle routing issues. It is critical to delivering emergency goods to customers with high reliability. In this paper, reliability in location and routing problems was considered as the probability of failure in depots, vehicles, and routs. The problem has two objectives, minimizing the cost and maximizing the reliability, the latter expressed by minimizing the expected cost of failure. First, a mathematical model of the problem was presented and due to its NP-hard nature, it was solved by a meta-heuristic approach using a NSGA-II algorithm and a discrete multi-objective firefly algorithm. The efficiency of these algorithms was studied through a complete set of examples and it was found that the multi-objective discrete firefly algorithm has a better Diversification Metric (DM) index; the Mean Ideal Distance (MID) and Spacing Metric (SM) indexes are only suitable for small to medium problems, losing their effectiveness for big problems.

Are Public Bureaucracies Supposed to Be High Reliability Organizations?

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Wolfgang Seibel
Keyword(s):  
Child Protection ◽  
Organization Theory ◽  
Goal Attainment ◽  
High Reliability ◽  
Human Action ◽  
High Reliability Organizations ◽  
Fine Grained ◽  
Trade Offs ◽  
Public Bureaucracy ◽  
Account Standard

This article addresses the question of to what extent conventional theories of high reliability organizations and normal accidents theory are applicable to public bureaucracy. Empirical evidence suggests precisely this. Relevant cases are, for instance, collapsing buildings and bridges due to insufficient supervision of engineering by the relevant authorities, infants dying at the hands of their own parents due to misperceptions and neglect on the part of child protection agencies, uninterrupted serial killings due to a lack of coordination among police services, or improper planning and risk assessment in the preparation of mass events such as soccer games or street parades. The basic argument is that conceptualizing distinct and differentiated causal mechanisms is useful for developing more fine-grained variants of both normal accident theory and high reliability organization theory that take into account standard pathologies of public bureaucracies and inevitable trade-offs connected to their political embeddedness in democratic and rule-of-law-based systems to which belong the tensions between responsiveness and responsibility and between goal attainment and system maintenance. This, the article argues, makes it possible to identify distinct points of intervention at which permissive conditions with the potential to trigger risk-generating human action can be neutralized while the threshold that separates risk-generating human action from actual disaster can be raised to a level that makes disastrous outcomes less probable.

High Power UPS Selection Methodology and Installation Guideline for High Reliability Power Supply

2005 ◽  
Vol 1 (03) ◽  
pp. 396-402
Author(s):  
A. Sudrià ◽  
◽  
E. Jaureguialzo ◽  
A. Samper ◽  
R. Villafáfila ◽  
...  
Keyword(s):  
High Power ◽  
Power Supply ◽  
High Reliability ◽  
Selection Methodology

Design of a High Reliability Compact CubeSat Propulsion System

2021 ◽  
Author(s):  
Carl Hartsfield ◽  
Travis E. Shelton ◽  
Greg Cobb
Keyword(s):  
High Reliability ◽  
Propulsion System
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