Using a low-cost communications tool in data communications courses (tutorial session)

1990 ◽  
Author(s):  
Larry Hughes
Keyword(s):  
Low Cost ◽  
Data Communications ◽  
Tutorial Session

Wireless mesh network data communications and reliability analysis for anti-theft application deployment in educational institutions

2019 ◽  
Vol 17 (3) ◽  
pp. 474-489
Author(s):  
Roger van Rensburg ◽  
Bruce Mellado ◽  
Cesar Augusto Marin Tobon
Keyword(s):  
South Africa ◽  
Mesh Networks ◽  
Low Cost ◽  
Mesh Network ◽  
Educational Institutions ◽  
Data Communications ◽  
Wireless Technology ◽  
Content Type ◽  
Wireless Mesh

Purpose The purpose of this study is to locally develop low-cost wireless mesh networks for reliable data communications to devices that prevent the theft of these devices in learning institutions of South Africa. Design/methodology/approach A network test-bench was developed where millions of packets were transmitted and logged between interconnected nodes to analyze the quality of the network’s service in a harsh indoor building environment. Similar methodologies in “big data” analysis as found in particle physics were adopted to analyze the network’s performance and reliability. Findings The results from statistical analysis reveal the quality of service between multiple asynchronous transmitting nodes in the network and compared with the wireless technology routing protocol to assess coverage in large geographical areas. The mesh network provides stable data communications between nodes with the exception of reliability degradation in some multi-hopping routes. Conclusions are presented to determine whether the underlining mesh network technology will be deployed to protect devices against theft in educational institutions of South Africa. Research limitations/implications The anti-theft application will focus on proprietary firmware development with a reputable tablet manufacturer to render the device inoperable. Data communications of devices to the network will be monitored and controlled from a central management system. The electronics embedding the system-on-chip will be redesigned and developed using the guidelines stipulated by the chip manufacturer. Originality/value Design and development of low-cost wireless mesh networks to protect tablets against theft in institutions of digitized learning. The work presents performance and reliability metrics of a low-power wireless mesh wireless technology developed in a harsh indoor building environment.

Low cost, integrated 4-element laser arrays with passive fibre alignment for optical data communications links

1997 ◽  
Vol 33 (18) ◽  
pp. 1551
Author(s):  
E.M. Thom ◽  
P.J. Williams ◽  
J.P. Hall ◽  
D.J. Robbins ◽  
J.M. Fine ◽  
...  
Keyword(s):  
Low Cost ◽  
Optical Data ◽  
Data Communications ◽  
Laser Arrays ◽  
Fibre Alignment

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

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