scholarly journals Opportunities and Challenges to Implementation of LIFI

2020 ◽  
Author(s):  
Mohammad Abdullah ◽  
Sameed ul Hussan ◽  
Salman Safdar
Keyword(s):  
Light Emitting Diode ◽  
Visible Radiation ◽  
Light Emitting ◽  
Internet Connection ◽  
The World ◽  
Iot Devices ◽  
Data Transferring ◽  
Better Than ◽  
The Way

LIFI was first introduce by Professor Harald Haas on July 2011. Light fidelity (LI-FI) may be a technology which uses light as a medium to travel from one place to a different. It uses Light like Light Emitting Diode (LED) visible radiation Communication (VLC) for data Transferring and Internet connection. LIFI may be a technique which uses light as a medium because it uses light to travel it's 20 times faster than any WIFI within the world. during this paper we speak about things like what's LIFI and the way it's better then WIFI why we want LIFI and What changes did bring LIFI in our Future LIFI. How it'll make IOT devices far better than before The Technique to implement LIFI and also the problem we face of implementation of LIFI

scholarly journals Growth of pre-sprouted sugarcane seedlings submitted to supplementary lighting

2020 ◽  
Vol 24 (3) ◽  
pp. 194-199
Author(s):  
Luiz A. Almeida Neto ◽  
Cristiane Guiselini ◽  
Dimas Menezes ◽  
José J. F. Cordeiro Júnior ◽  
Héliton Pandorfi
Keyword(s):  
Plant Height ◽  
New Technologies ◽  
Light Emitting Diode ◽  
Stem Length ◽  
Market Demand ◽  
Light Emitting ◽  
The World ◽  
Lighting Systems ◽  
Supplementary Lighting ◽  
Experimental Plots

ABSTRACT Brazil is the largest producer and exporter of sugarcane in the world, and the sugar and ethanol sector has invested in the development of new technologies and methods of planting to meet the market demand. Thus, the aim of this study was to evaluate the performance of sugarcane at the acclimation phase and under field conditions, from pre-sprouted seedlings exposed to supplementary lighting, through light-emitting diode, in the period of acclimation in a greenhouse. The experiment was carried out in Carpina, PE, Brazil, from January to September 2017. The experimental plots were composed of pre-sprouted seedlings acclimated in greenhouse, exposed to the supplementary lighting systems, 90% Red + 10% Blue (R:B 90/10), 80% Red + 20% Blue (R:B 80/20), 70% Red + 30% Blue (R:B 70/30) and a control. The evaluation of seedling growth was performed through the measurement of biometric indicators: plant height (cm); stem length (cm); stem diameter (cm) and number of tillers. The biometric indicators showed no significant differences, but plants under lighting systems with a greater proportion of the red wavelength (R:B 80/20 and R:B 90/10) showed higher percentage of survival in the field.

scholarly journals Detecting IoT Devices and How They Put Large Heterogeneous Networks at Security Risk

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4107
Author(s):  
Sharad Agarwal ◽  
Pascal Oser ◽  
Stefan Lueders
Keyword(s):  
Large Scale ◽  
Nuclear Research ◽  
The Internet ◽  
Security Risk ◽  
European Organization ◽  
Security Issues ◽  
Large Scale Network ◽  
The World ◽  
Iot Devices ◽  
The Way

The introduction of the Internet of Things (IoT), i.e., the interconnection of embedded devices over the Internet, has changed the world we live in from the way we measure, make calls, print information and even the way we get energy in our offices or homes. The convenience of IoT products, like closed circuit television (CCTV) cameras, internet protocol (IP) phones, and oscilloscopes, is overwhelming for end users. In parallel, however, security issues have emerged and it is essential for infrastructure providers to assess the associated security risks. In this paper, we propose a novel method to detect IoT devices and identify the manufacturer, device model, and the firmware version currently running on the device using the page source from the web user interface. We performed automatic scans of the large-scale network at the European Organization for Nuclear Research (CERN) to evaluate our approach. Our tools identified 233 IoT devices that fell into eleven distinct device categories and included 49 device models manufactured by 26 vendors from across the world.

A Case Study on the Development of Broadband Technology in Canada

2006 ◽  
pp. 68-72
Author(s):  
Rocci Luppicini
Keyword(s):  
Internet Connection ◽  
Digital Subscriber Lines ◽  
The World ◽  
The Impact ◽  
To Receive ◽  
The U.S ◽  
The Way

Broadband commonly refers to Internet connection speeds greater than narrowband connection speed of 56kbs. Digital subscriber lines (DSL) and cable modems were the most popular forms of broadband in public use over the last 10 years. In 2004, over 80% of U.S. homes were equipped with cable modems, and up to 66% of U.S. households were able to receive DSL transmissions. It is expected that the impact of broadband technologies will continue to play an important role in the U.S. and the rest of the world. It is predicted that the number of broadband-enabled homes will exceed 90 million worldwide by 2007 (Jones, 2003). Canada and Korea currently are the two countries leading the way in broadband saturation. The following discussion focuses on the Canadian case of broadband development.

scholarly journals Optimal Color Stability for White Organic Light-Emitting Diode (WOLED) by Using Multiple-Ultra-Thin Layers (MUTL)

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Kan-Lin Chen ◽  
Chien-Jung Huang ◽  
Wen-Ray Chen ◽  
Fong-Yi Lin ◽  
Teen-Hang Meen ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Color Stability ◽  
Thin Layers ◽  
Slight Variation ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Glass Substrates ◽  
Organic Light ◽  
Ito Glass ◽  
Better Than

The work demonstrates the improvement of color stability for white organic light-emitting diode (WOLED). The devices were prepared by vacuum deposition on ITO-glass substrates. These guest materials of 5,6,11,12-tetraphenylnaphthacene (Rubrene) were deposited in 4,4′-bis(2,2-diphenyl vinyl)-1,1′-biphenyl (DPVBi), resulting in an emitting layer. Experimental results reveal that the properties in the multiple-ultra-thin layer (MUTL) are better than those of the emitting layer with a single guest material, reaching the commercial white-light wavelength requirement of 400–700 nm. The function of the MUTL is as the light-emitting and trapping layer. The results show that the MUTL has excellent carrier capture effect, leading to high color stability of the device at various applied voltages. The Commissions Internationale De L’Eclairage (CIE) coordinate of this device at 3~7 V is few displacement and shows a very slight variation of (0.016, 0.009). The CIE coordinates at a maximal luminance of 9980 cd/m2are (0.34, 0.33).

scholarly journals A 340/380 nm light-emitting diode illuminator for Fura-2 AM ratiometric Ca2+ imaging of live cells with better than 5 nM precision

2017 ◽  
Vol 269 (3) ◽  
pp. 212-220 ◽  
Author(s):  
P.W. TINNING ◽  
A.J.P.M. FRANSSEN ◽  
S.U. HRIDI ◽  
T.J. BUSHELL ◽  
G. MCCONNELL
Keyword(s):  
Light Emitting Diode ◽  
Live Cells ◽  
Light Emitting ◽  
Fura 2 ◽  
Better Than

scholarly journals Revision of Smart Street Lighting LED

2019 ◽  
Vol 15 (28) ◽  
Author(s):  
Diego Julián Rodríguez Patarroyo ◽  
Iván Felipe Cely Garzón ◽  
Cristhian Alexander Letrado Forero
Keyword(s):  
Energy Efficiency ◽  
Energy Use ◽  
Light Emitting Diode ◽  
Lighting System ◽  
Street Lighting ◽  
Light Emitting ◽  
The World ◽  
Current Context ◽  
Lighting Systems ◽  
And Performance

Introduction: This Literature Review article is the result of a research on the current situation of smart public lighting systems with light-emitting diode (LED) technology in cities around the world. Problem: How convenient is it to use smart public lighting system with LED luminaires? Objective: To review the context of smart public lighting with LED technology. Methodology: Within this project, a lit review was conducted with more than 50 academic articles found in different databases such as: IEEE Xplore, Scopus, ScienceDirect etc. The selection criteria of the information followed the revision of articles from 2006 to 2018, and also, took into account their installation and performance in different cities and places of the world. Furthermore, articles on polluting and inefficient technologies were excluded. Conclusion: Considering the current context in which LED smart public lighting is, it is more likely to be implemented in the future. Results: Smart LED street lighting systems are more efficient in energy use, leads to savings in costs in medium terms, and finally, present a lower environmental impact compared to conventional lighting systems. Limitations: The review focuses on energy efficiency and economic aspects, not on social aspects. Originality: Smart LED public lighting systems have been researched within the economic and energy efficiency context.

scholarly journals Detecting IoT Devices and How They Put Large Heterogeneous Networks at Security Risk

2019 ◽  
Author(s):  
Sharad Agarwal ◽  
Pascal Oser ◽  
Stefan Lüders
Keyword(s):  
Large Scale ◽  
Nuclear Research ◽  
The Internet ◽  
Security Risk ◽  
European Organization ◽  
Security Issues ◽  
Large Scale Network ◽  
The World ◽  
Iot Devices ◽  
The Way

The introduction of the Internet of Things (IoT), i.e. the interconnection of embedded devices over the Internet, has changed the world we live in from the way we measure, make calls, print information and even the way we get energy in our offices or homes. The convenience of IoT products, like CCTV cameras, IP phones, and oscilloscopes, is overwhelming for end-users. In parallel, however, security issues have emerged and it is essential for infrastructure providers to assess the associated security risks. In this paper, we propose a novel method to detect IoT devices and identify the manufacturer, device model, and the firmware version currently running on the device using the page source from the web user interface. We performed automatic scans of the large-scale network at the European Organization for Nuclear Research (CERN) to evaluate our approach. Our tools identified 233 IoT devices that fell into eleven distinct device categories and included 49 device models manufactured by 26 vendors from across the world.

Porous Silicon-Based Optoelectronic Devices: Processing and Characterization

1992 ◽  
Vol 283 ◽  
Author(s):  
Nader M. Kalkhoran
Keyword(s):  
Porous Silicon ◽  
Light Emitting Diode ◽  
Optoelectronic Devices ◽  
Porous Si ◽  
Light Emitting ◽  
Anodic Etching ◽  
Wafer Scale Integration ◽  
Scale Integration ◽  
Silicon Based ◽  
Better Than

ABSTRACTA patterning process compatible with conventional Si electronics technology, which has resolution better than 5 μm, has been developed in order to perform selected-area anodic etching for producing luminescent porous Si layers (PSL). Correlations between the anodic etching and photolithographic parameters have been identified, and their effects on the resolution and luminescence of porous Si layers have been studied. Finally, the first monolithic processing, i.e., true wafer-scale integration, of a Si-based visible light-emitting diode (LED) and a photodetector using conventional Si technology has been demonstrated.

scholarly journals Evolution of Brightness and Color of the Night Sky in Madrid

2021 ◽  
Vol 13 (8) ◽  
pp. 1511
Author(s):  
José Robles ◽  
Jaime Zamorano ◽  
Sergio Pascual ◽  
Alejandro Sánchez de Miguel ◽  
Jesús Gallego ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Data Filtering ◽  
Term Study ◽  
Light Emitting ◽  
Long Term Study ◽  
The World ◽  
Sky Brightness ◽  
The City ◽  
Sizable Fraction

Major schemes to replace other streetlight technologies with Light-Emitting Diode (LED) lamps are being undertaken across much of the world. This is predicted to have important consequences for nighttime sky brightness and color. Here, we report the results of a long-term study of these characteristics focused on the skies above Madrid. The sky brightness and color monitoring station at Universidad Complutense de Madrid (inside the city) collected Johnson B, V, and R sky brightness data, Sky Quality Meter (SQM), and Telescope Encoder Sky Sensor-WiFi (TESS-W) broadband photometry throughout the night, every night between 2010–2020. Our analysis includes a data filtering process that can be used with other similar sky brightness monitoring data. Major changes in sky brightness and color took place during 2015–2016, when a sizable fraction of the streetlamps in Madrid changed from High-Pressure Sodium (HPS) to LEDs. The sky brightness detected in the Johnson B band darkened by 14% from 2011 to 2015 and brightened by 32% from 2015 to 2019.

scholarly journals A 340/380 nm light emitting diode illuminator for Fura-2 AM ratiometric Ca2+ imaging of live cells with better than 5 nM precision

2017 ◽  
Author(s):  
Peter W. Tinning ◽  
Aimee J. P.M. Franssen ◽  
Shehla U. Hridi ◽  
Trevor J. Bushell ◽  
Gail McConnell
Keyword(s):  
Optical Imaging ◽  
Temporal Resolution ◽  
Hippocampal Neurons ◽  
Light Emitting Diode ◽  
Live Cells ◽  
Acetoxymethyl Ester ◽  
Light Emitting ◽  
Fura 2 ◽  
Current Systems ◽  
Better Than

AbstractWe report the first demonstration of a fast wavelength-switchable 340/380 nm light emitting diode (LED) illuminator for Fura-2 ratiometric Ca2+ imaging of live cells. The LEDs closely match the excitation peaks of bound and free Fura-2 and enables the precise detection of cytosolic Ca2+ concentrations, which is only limited by the Ca2+ response of Fura-2. Using this illuminator, we have shown that Fura-2 acetoxymethyl ester (AM) concentrations as low as 250 nM can be used to detect induced Ca2+ events in tsA-201 cells and while utilizing the 150 μs switching speeds available, it was possible to image spontaneous Ca2+ transients in hippocampal neurons at a rate of 24.39 Hz that were blunted or absent at typical 0.5 Hz acquisition rates. Overall, the sensitivity and acquisition speeds available using this LED illuminator significantly improves the temporal resolution that can be obtained in comparison to current systems and supports optical imaging of fast Ca2+ events using Fura-2.

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