scholarly journals Performance and Environmental Impacts Review of Li-Fi and Wi-Fi Technologies

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Christoforus Williem Deo Lumoindong ◽  
Andre Muslim ◽  
Burawi Mohamed Nasreddin ◽  
Mia Galina
Keyword(s):  
Visible Light ◽  
Growth Inhibition ◽  
Radio Frequency ◽  
Environmental Impacts ◽  
Data Transfer ◽  
Environmental Problems ◽  
The Internet ◽  
Internet Connectivity ◽  
Led Light ◽  
Rf Signal

Nowadays, internet connectivity is one of the staple things in human lifestyle, especially for those who live in cities. There are a lot of ways to connect to the internet, and one of them is using Wi-Fi (Wireless Fidelity) connection. Wi-Fi connection is seen as the most reliable connection, until Li-Fi (Light Fidelity) technology is coined in 2011. Li-Fi uses visible light as data transfer medium instead of radio frequency (RF) signal used by Wi-Fi. Theoretically, Li-Fi is able to reach hundred times of Wi-Fi connection speed due to their use of light as data transfer medium. Li-Fi is also expected as a solution to environmental problems caused by Wi-Fi. The RF signal used by Wi-Fi can cause some environmental problems such as growth inhibition and diseases to organisms including humans. The visible light used by Li-Fi is expected to cause minimal effects to the environment, as Li-Fi uses common LED light bulbs which are used as home lighting apparatus.  Li-Fi is commonly seen as a ‘greener’ technology compared to Wi-Fi. In this review, the performance and environmental impacts of both Wi-Fi and Li-Fi are analysed to determine whether Li-Fi is really capable to be a ‘greener’ replacement to Wi-Fi technology

scholarly journals Data Transmission using Visible Light Communication

2020 ◽  
Vol 9 (3) ◽  
pp. 192-195
Keyword(s):  
Visible Light ◽  
Radio Frequency ◽  
Electromagnetic Interference ◽  
Data Transfer ◽  
Design Method ◽  
Serial Communication ◽  
Visible Light Communication ◽  
Research Field ◽  
Radio Waves ◽  
Light Spectrum

The demand placed on wireless technology which uses Radio Frequency (RF) in the present society is growing exponentially. In the near future, due to the limited bandwidth of RF spectrum, these resources will reach an overload point. A technique of contradicting the radio frequency spectrum issue is the use of Visible Light Spectrum. Light-Fidelity (Li-Fi) is a research field which uses the visible light band within the Visible Light Communication (VLC). This paper describes the research about VLC, the design method and testing of a VLC prototype using UART (Universal Asynchronous Receiver/Transmitter) module. The design method consists of serial communication module written in python called pySerial to convert the file data to stream of bits to be sent via LED. The designed prototype is simple, cheap and provides a concrete base for fellow researchers to work further in this field. The principle of VLC is effectively exhibited in this prototype. Also, the feasibility of writing the codes in Python language, proper electronic components used to process bit wise data signals and advantages of serial communication for data transfer are successfully displayed. VLC has major application in indoor communication, underwater communication and in hospitals where radio waves causes Electromagnetic Interference.

Open Localization in Micro LeadFrame Package Using Space Domain Reflectometry

2013 ◽  
Author(s):  
J. Gaudestad ◽  
V. Talanov ◽  
A. Orozco ◽  
M. Marchetti
Keyword(s):  
Magnetic Field ◽  
Radio Frequency ◽  
Standing Wave ◽  
High Resistance ◽  
Space Domain ◽  
The Past ◽  
Open Defects ◽  
Rf Electronics ◽  
Rf Signal ◽  
The Magnetic Field

Abstract In the past couple years, Space Domain Reflectometry (SDR) has become a mainstream method to locate open defects among the major semiconductor manufacturers. SDR injects a radio frequency (RF) signal into the open trace creating a standing wave with a node at the open location. The magnetic field generated by the standing wave is imaged with a SQUID sensor using RF electronics. In this paper, we show that SDR can be used to non-destructively locate high resistance failures in Micro LeadFrame Packages (MLP).

Power Line Carrier-Based Networking Technology of the Internet of Things

2012 ◽  
Vol 516-517 ◽  
pp. 1414-1418 ◽  
Author(s):  
Hua Yin ◽  
Bin Fa Long ◽  
Nai Zhou Wang
Keyword(s):  
Internet Of Things ◽  
Radio Frequency ◽  
Power Line ◽  
The Internet ◽  
Application Technology ◽  
Basic Principles ◽  
Power Line Carrier ◽  
Networking Technology ◽  
The Internet Of Things

This article discussed the basic principles of the power line carrier application technology and an example scheme, The unique advantage of the power line carrier networking technology is applied in the Internet of things. The advantage of the application of the power line carrier in the difficult environment of radio frequency application and layout is pointed out.

Design and Simulation of a PC to PC Communication Network via Fiber Optic Cable

2013 ◽  
Vol 824 ◽  
pp. 206-214
Author(s):  
Babatunde A. Adegboye ◽  
B.B. Bello ◽  
K.R. Ekundayo ◽  
Juliet N. Adegboye
Keyword(s):  
Communication Network ◽  
Fiber Optic ◽  
Data Transfer ◽  
The Internet ◽  
Serial Port ◽  
Fiber Optic Cable ◽  
Optical Transmitter ◽  
Wireless Medium ◽  
Fiber Optic Communication ◽  
Optic Communication

This paper deals with data transfer from one computer to another. The serial ports of the computer are used. MAX 232 is used to convert RS 232 logic to TTL logic and then an optical transmitter circuit is used to transmit data via fiber optic cable. The optical transmitter circuit has an LED which is matched with the cable. At the receiver an optical receiver circuit is used which receives data using a photo diode and a MAX 232 again to convert TTL logic to RS 232 for the serial port at the receiving end computer. The desired baud rate can be set. Although the internet can be used, but due to its time consuming nature, one can implement data transfer using wireless medium, though at a relatively high cost. The need, therefore, is felt for fiber optic communication which is cheaper and more suitable for the task. It is cheaper than wireless medium and is prone to lesser loss as compared to wireless medium.

scholarly journals Efficient Exploitation of Radio Frequency and Visible Light Communication Bands for D2D in Mobile Networks

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 168922-168933 ◽  
Author(s):  
Mehyar Najla ◽  
Pavel Mach ◽  
Zdenek Becvar ◽  
Petr Chvojka ◽  
Stanislav Zvanovec
Keyword(s):  
Visible Light ◽  
Radio Frequency ◽  
Mobile Networks ◽  
Visible Light Communication

scholarly journals Winemaking, Environmental Impacts and Sustainability: New Pathways from Vineyard to Glass?

2020 ◽  
Vol 10 (1) ◽  
pp. 223-243
Author(s):  
Carla Pires Vieira da Rocha ◽  
Eunice Sueli Nodari
Keyword(s):  
Environmental Impacts ◽  
Environmental Problems ◽  
Time Frame ◽  
Human Beings ◽  
Agrifood System ◽  
The Future ◽  
The Relationship

In this text we explore the relationship between vitiviniculture and environment, observing the current conjuncture in which environmental problems are worsening. Taking as a baseline a survey of the literature and as a time frame the 1970s to the present, we begin by examining the development of vitiviniculture from the wider perspective of the contemporary global agrifood system, highlighting in particular the environmental impacts generated by this system. Next, taking into account the panorama of vitiviniculture in Brazil, we turn our focus to notions of sustainability with the aim of outlining possibilities for a reconfiguring of this issue and, at the same time, contextualizing the extent to which the country has been pursuing this direction. We conclude that the future of winemaking depends especially on a more harmonious intervention of human beings in the environment.

scholarly journals Enterprise Network Packet Filtering for Mobile Cryptographic Identities

2010 ◽  
Vol 1 (1) ◽  
pp. 79-94 ◽  
Author(s):  
Janne Lindqvist ◽  
Essi Vehmersalo ◽  
Miika Komu ◽  
Jukka Manner
Keyword(s):  
Network Security ◽  
Security Policy ◽  
Data Transfer ◽  
The Internet ◽  
Policy Enforcement ◽  
Enterprise Network ◽  
Packet Filtering ◽  
Enterprise Network Security ◽  
Host Identity ◽  
Mobile Clients

Firewalls are an essential component of the Internet and enterprise network security policy enforcement today. The configurations of enterprise firewalls are typically rather static. Even if client’s IP addresses can be dynamically added to the packet filtering rules, the services allowed through the firewall are commonly still fixed. In this paper, we present a transparent firewall configuration solution based on mobile cryptographic identifiers of Host Identity Protocol (HIP). HIP allows a client to protect the data transfer with IPsec ESP, and supports dynamic address changes for mobile clients. The HIP-based firewall learns the identity of a client when it communicates with the server over HIP. The firewall configures the necessary rules based on HIP control messages passing through the firewall. The solution is secure and flexible, and introduces only minimal latency to the initial HIP connection establishment.

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