Li-Fi is a technology that uses light from light-emitting diodes (LEDs) for high-speed data transmission. It can transmit data through illumination at speeds up to 500 Mbps, which is faster than current Wi-Fi technologies. Li-Fi uses visible light communication (VLC) which involves varying the intensity of light from an LED to transmit data. It takes advantage of unused spectrum in the electromagnetic spectrum and has several advantages over traditional Wi-Fi such as higher bandwidth, more secure communication, and lower costs. Some potential applications of Li-Fi include indoor networking, traffic light communication systems, and "underwater communications."
Li-fi is transmission of data through illumination by taking the fiber out of fiber optics by sending data through a LED light bulb that varies in intensity faster than the human eye can follow. Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.
Li-Fi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices. However, LiFi bulbs are outfitted with a chip that modulates the light imperceptibly for optical data transmission. LiFi data is transmitted by the LED bulbs and received by photoreceptors.
W
hether you’re using wireless internet in a coffee shop,stealing it from the guy next door, or competing for bandwidth at a conference, you have probably gotten frustrated at the slow speeds you face when more than one device is tapped into the network. As more and more people and their manydevices access wireless internet, clogged airwaves are going tomake it.
One German physicist, Harald Haas has come up with asolution he calls “data through illumination” –taking the fibberout of fiber optic by sending data through an LED light bulbthat varies in intensity faster than the human eye can follow.It’s the same idea band behind infrared remote controls but farmore powerful.
Haas says his invention, which he calls D-Light,can produce data rates faster than 10 megabits persecond, which is speedier than your average broadbandconnection. He envisions a future where data for laptops,smart phones, and tablets is transmitted through the light in aroom. And security would be snap – if you can’t see the light,you can’t access the data.
Li-Fi is typically implemented using white LED light bulbs at the downlink transmitter. These devices are normally used for illumination only by applying a constant current. However, by fast and subtle variations of the current, the optical output can be made to vary at extremely high speeds. This very property of optical current is used in Li-Fi setup.The operational procedure is very simple-,data from the internet and local network is used to modulate the intensity of the LED light source if any undetectable to the human eye. The photo detector picks up signal, which is converted back into a data stream and sent to the client.
The client can communicate through its own LED output or over the existing network. An overhead lamp fitted with an LED with signal-processing technology streams data embedded in its beam at ultra-high speeds to the photo-detector. A receiver dongle then converts the tiny changes in amplitude into an electrical signal, which is then converted back into a data stream and transmitted to a computer or mobile device.
In this technology, light is passed through transmission channel as it is the fastest medium. It overcomes the defect of WI-FI as well. Transmission of data takes place through illumination. Using this, we can connect to several devices under a single LED light.
At the heart of this technology, a new generation of high-brightness light-emitting diodes. Very simply, if the LED is ON, user can transmit a digital string of 1, if it’s OFF then user can transmit a string of 0. It can be switched ON and OFF very quickly, which gives instant opportunity for transmitting data. It is possible to encode data in the light by varying the rate at which the LEDs flicker ON and OFF to pass different strings of 1s and 0s. The modulation is so fast that the human eye doesn’t notice. There are over 14 billion light bulbs used across the world, which needs to be replaced with LEDs ones that transmit data.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Lifi(Light fidelity)-Efficient use of visible spectruminventionjournals
ABSTRACT : LEDs are beginning to be used in every home and office which makes LED’s light ideal for ubiquitous data transmitter This means that everywhere where LEDs are used, lighting bulbs can bring not only the light but wireless connection at the same time. With increasing demand for wireless data, lack of radio spectrum and issues with hazardous electromagnetic pollution, LiFi is a new wireless communication technology which enables a wireless data transmission through LED light. LiFi appears as a new greener, healthier and cheaper alternative to WiFi. Li-Fi is the emerging area of technology is also known as Visible Light Commu-nications (VLC) .Moreover LiFi makes possible to have a wireless Internet in specific environments (hospitals, airplanes etc.) where WiFi is not allowed due to interferences or security considerations.
Li-Fi is a new wireless technology which provides the connectivity within localized network environment. The main principle of this technology is we can transmit the data using light illumination by using light emitting diodes where radio frequency is media in Wi-Fi and LED bulb light intensity is faster than human eye can follow. One germen phycist-Prof Harald Haas an expert in optical wireless communications at the University of Edinburgh, he demonstrated how an LED bulb equipped with signal processing technology could stream a high-definition video to a computer. By using this technology a one-watt LED light bulb would be enough to provide net connectivity to four computers. He coined the term "light fidelity" or Li-Fi. He visualizes a future where data for laptops, Smartphone, and tablets is transmitted through the light in a room. This technology is still under research and further exploitation could lead to wide applications.
Smart phones, tablets, and the rise of the Internet of Things are driving an insatiable demand for wireless capacity. This demand requires networking and Internet infrastructures to evolve to meet the needs of current and future multimedia applications. Wireless HetNets will play an important role toward the goal of using a diverse spectrum to provide high quality-of-service, especially in indoor environments where most data are consumed. An additional tier in the wireless HetNets concept is envisioned using indoor gigabit small-cells to offer additional wireless capacity where it is needed the most. The use of light as a new mobile access medium is considered promising. In this article, we describe the general characteristics of WiFi and VLC (or LiFi) and demonstrate a practical framework for both technologies to coexist. We explore the existing research activity in this area and articulate current and future research challenges based on our experience in building a proof-of-concept prototype VLC HetNet.
This paper attempts to clarify the difference between visible light communication (VLC) and Light-Fidelity (LiFi). In particular, it will show how LiFi takes VLC further by using light emitting diodes (LEDs) to realise fully networked wireless systems. Synergies are harnessed as luminaries become LiFi attocells resulting in enhanced wireless capacity providing the necessary connectivity to realise the Internet-of-Things (IoT), and contributing to the key performance indicators for the 5th generation of cellular systems (5G) and beyond
Li-Fi is a new wireless technology which provides the connectivity within localized network environment. The main principle of this technology is we can transmit the data using light illumination by using light emitting diodes where radio frequency is media in Wi-Fi and LED bulb light intensity is faster than human eye can follow. One germen phycist-Prof Harald Haas an expert in optical wireless communications at the University of Edinburgh, he demonstrated how an LED bulb equipped with signal processing technology could stream a high-definition video to a computer. By using this technology a 1 watt LED light bulb would be enough to provide net connectivity to four computers. This technology termed as "light fidelity". This technology allows us to transfer data more securely with higher data rates. This technology is still under research and further exploitation could lead to wide applications.
Light Fidelity (Li-Fi) is a bidirectional, high speed , fully networked wireless communication technology similar to Wi-Fi. Li-Fi was first put forward by Professor Harald Haas,University of Edinburgh, during a TED Talk in 2011. Li-Fi is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or Cellular network), or even a replacement in contexts of data broadcasting. It is so far measured to be about 100 times faster than some Wi-Fi implementations, reaching speeds of 224 gigabits per second.
Li-fi is transmission of data through illumination by taking the fiber out of fiber optics by sending data through a LED light bulb that varies in intensity faster than the human eye can follow. Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.
Li-Fi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices. However, LiFi bulbs are outfitted with a chip that modulates the light imperceptibly for optical data transmission. LiFi data is transmitted by the LED bulbs and received by photoreceptors.
W
hether you’re using wireless internet in a coffee shop,stealing it from the guy next door, or competing for bandwidth at a conference, you have probably gotten frustrated at the slow speeds you face when more than one device is tapped into the network. As more and more people and their manydevices access wireless internet, clogged airwaves are going tomake it.
One German physicist, Harald Haas has come up with asolution he calls “data through illumination” –taking the fibberout of fiber optic by sending data through an LED light bulbthat varies in intensity faster than the human eye can follow.It’s the same idea band behind infrared remote controls but farmore powerful.
Haas says his invention, which he calls D-Light,can produce data rates faster than 10 megabits persecond, which is speedier than your average broadbandconnection. He envisions a future where data for laptops,smart phones, and tablets is transmitted through the light in aroom. And security would be snap – if you can’t see the light,you can’t access the data.
Li-Fi is typically implemented using white LED light bulbs at the downlink transmitter. These devices are normally used for illumination only by applying a constant current. However, by fast and subtle variations of the current, the optical output can be made to vary at extremely high speeds. This very property of optical current is used in Li-Fi setup.The operational procedure is very simple-,data from the internet and local network is used to modulate the intensity of the LED light source if any undetectable to the human eye. The photo detector picks up signal, which is converted back into a data stream and sent to the client.
The client can communicate through its own LED output or over the existing network. An overhead lamp fitted with an LED with signal-processing technology streams data embedded in its beam at ultra-high speeds to the photo-detector. A receiver dongle then converts the tiny changes in amplitude into an electrical signal, which is then converted back into a data stream and transmitted to a computer or mobile device.
In this technology, light is passed through transmission channel as it is the fastest medium. It overcomes the defect of WI-FI as well. Transmission of data takes place through illumination. Using this, we can connect to several devices under a single LED light.
At the heart of this technology, a new generation of high-brightness light-emitting diodes. Very simply, if the LED is ON, user can transmit a digital string of 1, if it’s OFF then user can transmit a string of 0. It can be switched ON and OFF very quickly, which gives instant opportunity for transmitting data. It is possible to encode data in the light by varying the rate at which the LEDs flicker ON and OFF to pass different strings of 1s and 0s. The modulation is so fast that the human eye doesn’t notice. There are over 14 billion light bulbs used across the world, which needs to be replaced with LEDs ones that transmit data.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Lifi(Light fidelity)-Efficient use of visible spectruminventionjournals
ABSTRACT : LEDs are beginning to be used in every home and office which makes LED’s light ideal for ubiquitous data transmitter This means that everywhere where LEDs are used, lighting bulbs can bring not only the light but wireless connection at the same time. With increasing demand for wireless data, lack of radio spectrum and issues with hazardous electromagnetic pollution, LiFi is a new wireless communication technology which enables a wireless data transmission through LED light. LiFi appears as a new greener, healthier and cheaper alternative to WiFi. Li-Fi is the emerging area of technology is also known as Visible Light Commu-nications (VLC) .Moreover LiFi makes possible to have a wireless Internet in specific environments (hospitals, airplanes etc.) where WiFi is not allowed due to interferences or security considerations.
Li-Fi is a new wireless technology which provides the connectivity within localized network environment. The main principle of this technology is we can transmit the data using light illumination by using light emitting diodes where radio frequency is media in Wi-Fi and LED bulb light intensity is faster than human eye can follow. One germen phycist-Prof Harald Haas an expert in optical wireless communications at the University of Edinburgh, he demonstrated how an LED bulb equipped with signal processing technology could stream a high-definition video to a computer. By using this technology a one-watt LED light bulb would be enough to provide net connectivity to four computers. He coined the term "light fidelity" or Li-Fi. He visualizes a future where data for laptops, Smartphone, and tablets is transmitted through the light in a room. This technology is still under research and further exploitation could lead to wide applications.
Smart phones, tablets, and the rise of the Internet of Things are driving an insatiable demand for wireless capacity. This demand requires networking and Internet infrastructures to evolve to meet the needs of current and future multimedia applications. Wireless HetNets will play an important role toward the goal of using a diverse spectrum to provide high quality-of-service, especially in indoor environments where most data are consumed. An additional tier in the wireless HetNets concept is envisioned using indoor gigabit small-cells to offer additional wireless capacity where it is needed the most. The use of light as a new mobile access medium is considered promising. In this article, we describe the general characteristics of WiFi and VLC (or LiFi) and demonstrate a practical framework for both technologies to coexist. We explore the existing research activity in this area and articulate current and future research challenges based on our experience in building a proof-of-concept prototype VLC HetNet.
This paper attempts to clarify the difference between visible light communication (VLC) and Light-Fidelity (LiFi). In particular, it will show how LiFi takes VLC further by using light emitting diodes (LEDs) to realise fully networked wireless systems. Synergies are harnessed as luminaries become LiFi attocells resulting in enhanced wireless capacity providing the necessary connectivity to realise the Internet-of-Things (IoT), and contributing to the key performance indicators for the 5th generation of cellular systems (5G) and beyond
Li-Fi is a new wireless technology which provides the connectivity within localized network environment. The main principle of this technology is we can transmit the data using light illumination by using light emitting diodes where radio frequency is media in Wi-Fi and LED bulb light intensity is faster than human eye can follow. One germen phycist-Prof Harald Haas an expert in optical wireless communications at the University of Edinburgh, he demonstrated how an LED bulb equipped with signal processing technology could stream a high-definition video to a computer. By using this technology a 1 watt LED light bulb would be enough to provide net connectivity to four computers. This technology termed as "light fidelity". This technology allows us to transfer data more securely with higher data rates. This technology is still under research and further exploitation could lead to wide applications.
Light Fidelity (Li-Fi) is a bidirectional, high speed , fully networked wireless communication technology similar to Wi-Fi. Li-Fi was first put forward by Professor Harald Haas,University of Edinburgh, during a TED Talk in 2011. Li-Fi is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or Cellular network), or even a replacement in contexts of data broadcasting. It is so far measured to be about 100 times faster than some Wi-Fi implementations, reaching speeds of 224 gigabits per second.
Practical Fibre Optics and Interfacing Techniques to Industrial Ethernet and ...Living Online
This manual will provide you with the necessary background to understand the fundamentals of fibre optic systems and their individual components including fibres, cable construction, connectors, splices and optical sources and detectors. Various pitfalls associated with the implementation of fibre optic systems are discussed and workable solutions to these problems are provided. It will provide you with the knowledge to develop the required techniques for design, installation and maintenance of fibre optic systems.
MORE INFORMATION: http://www.idc-online.com/content/practical-fibre-optics-and-interfacing-techniques-industrial-ethernet-and-wireless-23?id=58
Practical Fibre Optics & Interfacing Techniques to Industrial Ethernet and Wi...Living Online
This manual will provide you with the necessary background to understand the fundamentals of fibre optic systems and their individual components including fibres, cable construction, connectors, splices and optical sources and detectors. Various pitfalls associated with the implementation of fibre optic systems are discussed and workable solutions to these problems are provided. It will provide you with the knowledge to develop the required techniques for design, installation and maintenance of fibre optic systems.
FOR MORE INFORMATION: http://www.idc-online.com/content/practical-fibre-optics-and-interfacing-techniques-industrial-ethernet-and-wireless-23?id=58
Practical fibre Optics for Engineers and TechniciansLiving Online
The Fieldbus and DeviceNet standards are also becoming a standard at the field and instrumentation level, and are replacing the traditional approaches in the plant today. Ethernet is fast becoming the obvious choice for industrial control networking worldwide.
While the basic structure of Ethernet has not changed much, the faster technologies such as fast Ethernet and gigabit Ethernet have increased the complexity and choices you have available in planning and designing these systems. There has also been a convergence between Fieldbus and DeviceNet standards in that they are also increasingly becoming based on industrial Ethernet for the higher speed data transfer applications.
There is a fair degree of confusion about where Fieldbus, DeviceNet and Ethernet, are applied and the workshop commences with a clear comparison between the different standards and where they are applied. The first day focuses on AsiBus, DeviceNet, Profibus and Foundation Fieldbus technologies in a simple and understandable manner.
Practical Fibre Optics for Engineers and TechniciansLiving Online
This is a comprehensive manual that provides the necessary background to understand the fundamentals of fibre optic systems and their individual components including: o fibres o cable construction o connectors o splices o optical sources and detectors. You will be able to use this knowledge to develop the required techniques for design, installation and maintenance of fibre optic systems.
MORE INFORMATION: http://www.idc-online.com/content/fibre-optics-engineers-technicians-22?country=Australia
Development of an Audio Transmission System Through an Indoor Visible Light ...Mohammad Liton Hossain
This study presents an approach to develop an indoor visible light communication system capable of transmitting audio signal over light beam within a short distance. Visible Light Communication (VLC) is a pretty new technology which used light sources to transmit data for communication. In any communication system, both analog and digital signal transmission are possible, though, due to having the capability of providing a faithful quality of signal regeneration after the transmission process, digital communication system is much more popular than the analog one. In the current project, digital communication process was adopted also. To convert the analog audio signal into the digital transmission signal and vice versa, Pulse Width Modulation (PWM) was used as the signal encoding strategy. As the light emitter, white Light Emitting Diodes (LEDs) were used and as photo sensor, a solar cell was used instead of a photodiode to obtain greater signal power and sensitivity. In the system, the carrier signal for transmission was chosen to have a frequency of 50 KHz. At the receiving end, a 4th order Butterworth lowpass filter having a cutoff frequency of 8 KHz was used to demodulate the audio signal. Using only 2 white LEDs, the indoor transmission range of this visible light communication system was found to be 5 meters while reproducing a satisfactory quality audio.
Nanotechnology for Wireless and Telecommunications .docxvannagoforth
Nanotechnology for Wireless and Telecommunications Page 2
Nanotechnology for Wireless and Telecommunications 2
Nanotechnology for Wireless and Telecommunications
Rosendo Ramos
Student id# 31342432
ELEC 308 Nano-science and Nanotechnology
Professor Dr.Loucas
March 30, 2020
Abstract
Nanotechnology has nowadays become the most amazing study in many fields such as civil engineering, chemical engineering, electronics, and medicine. Nanotechnology is the manipulation of matter on an atomic molecular and supramolecular scale (Abdullah-Al-Shafi, 2016). This, therefore, means that at its essence, it is the science of how to use small things in the advancement of technology.
Introduction
The devices that use wireless communication ranges from RFID tags to television set receivers and satellites to mobile phones. The availability of internet access from mobile devices is growing at an exponential rate that causes rising demand on the wireless network and mobile devices' performance. As the type of activities that consumers are engaging in over the wireless connections is changing day in day out, it has been an increased need for the devices to change also. For instance in radios, the increasing quantity of mobile internet traffic there has been increased the need for additional frequency for support. The modern world is becoming an intelligent interactive environment that has needs novel autonomous sensors with wireless communication links that require to be incorporated into an everyday object. This is the reason why sensors that are nano-enabled integrated with small RF transceivers are useful in monitoring air quality, water pollution among other aspects. The main drivers of changing into nanotechnology in wireless devices are needed for high performance, reduced consumption of power as well as reduced compact size.
Background
In nanotechnology, a semiconductor is a material with electrical conductivity between a conductor and an insulator (Neupane, et al., 2019). In these semiconductors, the energy band that is highly occupied is filled with electrons completely and the next that is empty is the conduction band. The semiconductors resistivity can be altered by up to 10 orders of magnitude by doping. Semiconductors nanocrystals are made from various compounds. They are normally referred to as II-IV, III-V or IV-VI semiconductors nanocrystals. This is basing on the periodic table groups where there are three elements formed. Semiconductor nanowires are a unique system that will be in the future to be used in electronic and optoelectronic devices. It has been shown that if the semiconductor materials are minimized, their performance is maximized for their application in a wide range of material applications.
Nanotechnology applications
Nano-antenn ...
The study LiFi (Light Fidelity) demonstrates about how can we use this technology as a medium of communication similar to Wifi . This is the latest technology proposed by Harold Haas in 2011. It explains about the process of transmitting data with the help of illumination of an Led bulb and about its speed intensity to transmit data. Basically in this paper, author will discuss about the technology and also explain that how we can replace from WiFi to LiFi . WiFi generally used for wireless coverage within the buildings while LiFi is capable for high intensity wireless data coverage in limited areas with no obstacles .This research paper represents introduction of the Lifi technology,performance,modulation and challenges. This research paper can be used as a reference and knowledge to develop some of LiFitechnology.
The study LiFi (Light Fidelity) demonstrates about how can we use this technology as a medium of communication similar to Wifi . This is the latest technology proposed by Harold Haas in 2011. It explains about the process of transmitting data with the help of illumination of an Led bulb and about its speed intensity to transmit data. Basically in this paper, author will discuss about the technology and also explain that how we can replace from WiFi to LiFi . WiFi generally used for wireless coverage within the buildings while LiFi is capable for high intensity wireless data coverage in limited areas with no obstacles .This research paper represents introduction of the Lifi technology,performance,modulation and challenges. This research paper can be used as a reference and knowledge to develop some of LiFitechnology.
Telecommunication Systems: How is Technology Change Creating New Opportunitie...Jeffrey Funk
These slides discuss how improvements in the data rates of wireline and wireless systems have and continue to occur. For wireline systems, these improvements are driven by the use of better glass fiber, lasers, amplifiers, and wavelength division multiplexing and there appears to be few limits to these improvements. For wireless systems, these improvements are primarily driven by the use of better ICs. As long as these improvements in ICs continue to occur, improvements in data rates along with improvements in the use of the frequency spectrum continue to be possible. Improvements in both wireless and wireline systems will also make new forms of Internet content possible. Furthermore, these improvements in ICs along with the improvements in MEMS that are discussed in a related set of slides are gradually making cognitive radio economically feasible. All of these improvements are creating various kinds of entrepreneurial opportunities. These slides are based on a forthcoming book entitled “Technology Change and the Rise of New Industries and they are the sixth session in a course entitled “Analyzing Hi-Tech Opportunities.”
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Search and Society: Reimagining Information Access for Radical FuturesBhaskar Mitra
The field of Information retrieval (IR) is currently undergoing a transformative shift, at least partly due to the emerging applications of generative AI to information access. In this talk, we will deliberate on the sociotechnical implications of generative AI for information access. We will argue that there is both a critical necessity and an exciting opportunity for the IR community to re-center our research agendas on societal needs while dismantling the artificial separation between the work on fairness, accountability, transparency, and ethics in IR and the rest of IR research. Instead of adopting a reactionary strategy of trying to mitigate potential social harms from emerging technologies, the community should aim to proactively set the research agenda for the kinds of systems we should build inspired by diverse explicitly stated sociotechnical imaginaries. The sociotechnical imaginaries that underpin the design and development of information access technologies needs to be explicitly articulated, and we need to develop theories of change in context of these diverse perspectives. Our guiding future imaginaries must be informed by other academic fields, such as democratic theory and critical theory, and should be co-developed with social science scholars, legal scholars, civil rights and social justice activists, and artists, among others.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
2. ii
ABSTRACT
Today’s majority of data technique uses Radio Spectrum. But the major drawback of data
technique using radio spectrum is that it is very congested and the demand for wireless data
double each year. Every one, it seems want to use wireless data but the capacity is drying up.
Light –Fidelity is the transmission of data through illumination .It comprises of sending data
through a Light Emitting Diode which varies in intensity faster than human eye can follow .It
uses the fact that light travels at a such a high speed which is faster than human eye to catch.
Therefore when we vary the intensity of light emitting source it become impossible for the
humans to catch that sensation. It leads to very high speed data transmission, which is for
superior to current technologies.
3. iii
LIST OF TABLES
Table No. Table Name Page No.
1.1 Issues with various Division of Electromagnetic spectrum 3
3.1 Difference between Li-Fi and Wi-Fi 12
4. iv
LIST OF Figures
Table No. Table Name Page No.
1.1 Issues with various Division of Electromagnetic spectrum 4
3.1 Working of Li-Fi 11
5. v
CONTENTS
Chapter Page No.
Title Page i
Abstract ii
List of Tables iii
List of Figures iv
Table of Content v
1. Introduction 1
1.1 Existing Technology 1
1.2 Issues with various divisions of electromagnetic spectrum 4
1.3 Widely Used Spectra 5
2. Technology Used Behind 6
2.1 Visible Light Communication 7
2.2History Behind Visible light Communication 8
3. Facts and Working 9
3.1 Important facts about Li-Fi 10
3.2 Illustration of working of Li-Fi 11
3.3 Difference between Li-Fi and other technologies 12
3.4 Difference between Li-Fi and Wi-Fi 12
4. Advantages 13
5. Limitations 15
6. Applications 17
8. viii
INTRODUCTION
Light –Fidelity is the transmission of data through illumination .It comprises of sending data
through a Light Emitting Diode which varies in intensity faster than human eye can follow .It
uses the fact that light travels at a such a high speed which is faster than human eye to catch.
Therefore when we vary the intensity of light emitting source it become impossible for the
humans to catch that sensation. It leads to very high speed data transmission, which is for
superior to current technologies.
The major advantages of using Light-fidelity is that it uses the visible light spectra which is
still unexplored and have a large bandwidth to use. More advantages including are ,it is harmless,
cheap and have a high capacity.
1.1 Existing Technology
Existing technologies comprises of using different-different spectra of electromagnetic spectrum.
The electromagnetic spectrum is the range of all possible frequencies of electromagnetic
radiation. The "electromagnetic spectrum" of an object has a different meaning, and is instead
the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular
object. The electromagnetic spectrum extends from below the low frequencies used for
modern radio communication to gamma radiation at the short-wavelength (high-frequency) end,
thereby covering wavelengths from thousands of kilometers down to a fraction of the size of
an atom. The limit for long wavelengths is the size of the universe itself, while it is thought that the
short wavelength limit is in the vicinity of the Planck length. Until the middle of last century it was
believed by most physicists that this spectrum was infinite and continuous.
Most parts of the electromagnetic spectrum are used in science for spectroscopic and other probing
interactions, as ways to study and characterize matter. In addition, radiation from various parts of the
spectrum has found many other uses for communications and manufacturing. But today’s majority
of data transmission technique uses Radio Spectrum. It uses the frequency range of radio
waves that is 3 kHz to 300 GHz.
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Table 1.1 Division of Electromagnetic spectrum
Region of the
spectrum
Main interactions with matter
Radio
Collective oscillation of charge carriers in bulk material (plasma oscillation).
An example would be the oscillatory travels of the electrons in an antenna.
Microwave through far
infrared
Plasma oscillation, molecular rotation
Near infrared Molecular vibration, plasma oscillation (in metals only)
Visible
Molecular electron excitation (including pigment molecules found in the
human retina), plasma oscillations (in metals only)
Ultraviolet
Excitation of molecular and atomic valence electrons, including ejection of
the electrons (photoelectric effect)
X-rays
Excitation and ejection of core atomic electrons, Compton scattering (for
low atomic numbers)
Gamma rays
Energetic ejection of core electrons in heavy elements, Compton
scattering (for all atomic numbers), excitation of atomic nuclei, including
dissociation of nuclei
High-energy gamma
rays
Creation of particle-antiparticle pairs. At very high energies a single photon
can create a shower of high-energy particles and antiparticles upon
interaction with matter.
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1.2 ISSUES WITH VARIOUS DIVISION OF ELECTROMAGNETIC SPECTRA
Fig1.1 Issues with various Division of electromagnetic spectra
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1.3 SPECTRUM WHICH IS USED MOST OUT OF ALL THE
PREVIOUSLY MENTIONED IS: RADIO SPECTRUM
1.3.1 Radio Spectrum: Today’s majority of data transmission technique uses Radio Spectrum.
It uses the frequency range of radio waves that is 3 kHz to 300 GHz. The major drawback is that
it is very congested and the demand for wireless data double each year. But the bigger loophole
behind is that every one, it seems want to use wireless data but the capacity is drying up.
1.3.2 Drawbacks of Using Radio Spectrum
Availability: It is available within the range of Base stations and unavailable in aircrafts.
Capacity: Radio spectra have a less amount of band width therefore it is very vulnerable
to get used up in near future.
Efficiency: Consumes huge amount of energy for transmitting radio waves and to cool
the base station cabins
Security: Less secure as it can also pass through walls. So there is greater chance of
interference by others.
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TECHNOLOGY USED BEHIND
2.1 Visible Light Communication
Light-Fidelity uses the VLC Technology for its operation to be carried out. VLC stands for
Visible Light Communication (VLC) on which scientists including Dr.Gorden Povey, Prof
Harald Hass and Dr.Mostafa Afgani at University Of Edinburgh developed Li-fi.
Visible light communication can be understood as a data communication medium using visible
light between 400 and 800 THz (780-375 nm).Using visible light is less dangerous for high
power applications because humans can perceive it and act to protect their eyes from damage.
Visible light communication is a subset of the optical wireless communication technology.
The devices are normally used for illumination by applying a constant current through the LED.
These devices use fluorescent lamps (ordinary lamps,not special communications devices ) to
transmit signals at 10 kb/s to 500 MB/s currently which would enhance further in the coming
future. Low rate data transmission from 1 and 2 kilometers were demonstrated by Professor
Harald Hass.
Specially designed electronic devices generally containing a photodiode receive signals from
light sources, although in some cases a cell phone,camera or a digital camera will be sufficient .
The image sensor used in these devices is in fact an array of photodiodes. Such a sensor may
provide either multi-channel communication or a spatial awareness of multiple light sources.
The VLC standardization process is conducted within IEEE Wireless Personal Area networks
working group. Recently VLC based indoor positioning system has become an attractive topic
.VLCs can be used for providing security also.VLC can be used as a communication medium for
ubiquitious computing, because light –producing devices (such as indoor/outdoor lamps, car
headlights, etc.) are used everywhere.
Li-fi is the term used for fast and cheap light based Wi-Fi which uses the concept of Visible light
communication. It could make possible the data transmission cheap and fast than the
conventional data transmission technique.
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2.2 HISTORY BEHIND VISIBLE LIGHT COMMUNICATION
The history behind the visible light communication dates back to the 1880s in Washington D.C
when the Scottish born scientist Alexander Graphm Bell invented the photphone, which
transmitted speech on modulated sunlight over several hundred meters .This pre dates the
transmission of speech by radio.
More recent work began in 2003 at Nakagawa laboratory in Keio University,Japan using LEDs
to transmit data by visible light. Since then there have been numerous research activities focused
on VLC ,notably by Smart Lighting Engineering Centre ,Omega Project and work at Oxford
University.
In 2006, researchers from CICTR at Penn State proposed a combination of power line
communication (PLC) and white light LED to provide broadband access for indoor appliactions.
This research suggested that VLC could be deployed as a perfect last mile solution in future.
In January 2010 a team of researchers from Siemens and Fraunhofer Institute for
telecommunications demonstrated transmission at 500 Mb/s with a white LED over a distance of
5 metres and 100 Mb/s over longer distance using five LEDs.
The VLC standardization process is conducted within IEEE Wireless Personal Area
networks working group. Recently VLC based indoor positioning system has become an
attractive topic .VLCs can be used for providing security also.VLC can be used as a
communication medium for ubiquitious computing, because light –producing devices (such as
indoor/outdoor lamps, car headlights, etc.) are used everywhere.
In December 2010 St,Cloud ,Linnesto, signed a contract with LVX Minnesto and became the
first to commercially deploy this technology.
In July 2011 a live demonstration of high definition video being transmitted from a statndard
LED lamp was shown at Ted Global.
Recently ,VLC based indoor positioning system has become an attractive topic. Another recent
application is in the world of toys ,thanks to cost effective and low complexity implementation
,which only requires one microcontroller and one LED as optical front end.More over it has been
also used as optical transreceviers to build up VLc communication which links upto 10 MB/s
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3.1 IMPORTANT FACTS ABOUT Li-Fi
Light –Fidelity is the transmission of data through illumination .It comprises of sending data
through a Light Emitting Diode which varies in intensity faster than
human eye can follow .It uses the fact that light travels at a such a high speed which is faster
than human eye to catch.
Therefore when we vary the intensity of light emitting source it become impossible for the
humans to catch that sensation. It leads to very high speed data transmission, which is for
superior to current technologies.
The major advantages of using Light-fidelity is that it uses the visible light spectra which is
still unexplored and have a large bandwidth to use. More advantages including are ,it is harmless,
cheap and have a high capacity.
Some important facts about Light-Fidelity are:
Li-fi is now part of VLC PAN IEEE 802.15.7 standards.
It comprises of sending data through a Light Emitting Diode which varies in intensity faster
than human eye can follow
It uses the fact that light travels at such a high speed which is faster than human eye to
catch.
Instead of Wi-Fi modems, it would use LED lamps that can receive as well as transmit
information.
This technology uses a part of the electromagnetic spectrum that is still not greatly utilized-
Visible Light.
Li-fi has already achieved high speeds in the labs.
Although the maximum speed obtained by researchers is 500 megabytes per second, it is
currently very capable of transmitting 100 megabytes per second.
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3.2 ILLUSTRATION OF WORKING OF Li-Fi
Working of Li-fi is very simple.
If the LED is on, you transmit a 1 and when the LED is off you transmit a 0.
The LED can be switched on and off very quickly, which gives nice
opportunities for transmitting data.
There would be a photo detector (light sensor) on the other end to receive
data.
Fig 3.1 Working of Li-Fi
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3.3 Difference between Li-Fi and other technologies
Li-Fi differs from other technologies as following:
Li-fi is based on LEDs for the transfer of data.
The transfer of data can be with the help of all kinds of light ,no matter the part of spectrum
that they belong to.
The speed of the internet is incredibly high and one can download movies ,games ,etc. in just
a few minutes.
It also removes the limitation to be in a region where Wi-Fi is only present.
We can simply stand under any form of light and surf the internet as the connection is made
in case of any light presence .
3.4 Difference between Li-Fi and other Wireless Fidelity
Table 3.1
Parameters Light Fidelity Wireless Fidelity
Medium Uses light as a carrier Uses radio spectrum
Spectrum range Visible light Spectrum Radio frequency
spectrum
Speed for Data Transfer Future prospect predict
speed>500 Mbps
Data transfer speed>150
Mbps
Cost Cheaper because free
band does not need
Expensive as it uses
radio spectrum.
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license and it uses only
light
Operating frequency Hundreds of THz Usually 2.4 GHz.
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Advantages of Li-fi
Higher Bandwidth (almost 10000 times more) :Light fidelity works in the
Electromagnetic range of 430 terahertz to 730 terahertz. This range is far more than
which we currently use in the radio spectra. .The major drawback is that it is very
congested and the demand for wireless data double each year. But the bigger loophole
behind is that every one, it seems want to use wireless data but the capacity is drying up.
Availability: Visible light is available in quite good amount .Therefore it is very easy to
utilize that.
Efficiency: The efficiency can be measured by the input applied to output ,in the case of
Li-Fi the input we give is small amount of constant current but his is very small as
compared to the high speed we get for the data transmission from it.
High Security: One of the drawback of wireless fidelity was security but Li-fi has
reduced this ,as light cannot pass through opaque objects therefore it is more secure than
Wi-Fi.
Easy to use : It could be the most easy to use technology as it just need to switch from on
to off and off to on and data will be transmitted.
Fast data transfer: Li-Fi can provide speed upto 500 Mb/s.This is huge in comparision to
currently available to us.
Harmless: As only visible light is used and it is not harmful to any humans as compared
to x-rays or gamma rays.
Low cost: Li-Fi technology will be cost effective as free band does not need license and
it uses only light. And if compared to wireless fidelity which Expensive as it uses radio
spectrum it will a more edge than before.
High capacity: As the visible light has the maximum bandwidth it have a high capacity
as compared to others.
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5.1 Limitations of Li-Fi Technology
Opacity: As Light cannot pass through objects so on one side where it provide security
but it may also lead to limit its capability if it is be used on two different floors.It only
work in direct line of sight.
A major challenge facing Li-fi is hoe the receiving device will transmit back to the
transmitter. So this issue has to be resolved such that practicality of Li-Fi is feasible.
High initial cost of VLC systems: Since some initial cost is necessary for installing Li-Fi
equipment therefore it is a big issue to deal with.
Interferences from external light sources like sun, normal lights and opaque materials can
cause disturbance and even stopping of the light signals .
Well till now these are the only limitations that came forward in front of light fidelity and if these
are overcome we can except a lot of revolution in the field of high data transmission .And Li-Fi
will play a key role in data transmission.
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6.1 Applications of Li-Fi in human life
6.1.1 In House Communication: Giga shower
For Giga speeds technologies, the Li-fi consortium has defined Giga Shower, Giga MIMO and
Giga Spot. It provides unidirectional data services via several channels to multiple users .This is
like watching TV channels or listening to different radio stations where no uplink channel is
needed.
6.1.2 Traffic Lights
Traffic lights can communicate to each other and vehicles. Cars, Traffic lights and other vehicles
too have LED-based headlights so data can be easily transmitted to each other.
6.1.3 In Aircraft cabins
This is one of the advantage of li-fi as it could be used in aircrafts because Wi-Fi cannot be
used there.
6.1.4 Hospitals
In hospitals li-fi can be used in those instruments which are capable of light emitting and used
for data transmission.
6.1.5 Petroleum Stations
Li-fi can be used in petroleum stations as it provide a great source of light emitting sources like
vehicles.
6.1.6 Street lamps as free access points
As there are millions of street lamps deployed each of them can be used as free access points for
internet and fast data transmission also.
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7.1 Future Scope
Further enhancements can be made in this like using an array of LEDs for parallel data
transmission or mixtures of red, green and blue LEDs to alter the light’s frequency encoding a
different channel.
Such development promise a theoretical speed of 10 Gbps-meaning one can download a full
high-definition film in just few seconds. The possibilities are numerous and can be explored
further. If this technology can be used to practicality, every bulb can be used for something like a
Wi-Fi hotspots to transmit wireless data.
Li-Fi can be used in the places where it is difficult to lay the optical fiber . The concept of Li-fi is
currently attracting a great deal of interest ,not because it may offer a genuine and very efficient
alternative to radio –based wireless . As a growing number of people and their many devices
access wireless internet ,the airwaves are becoming increasingly clogged ,making it more
difficult to get a reliable ,high-speed signal. This may solve issues such as the shortage of radio-
frequency bandwidth and also allow internet where traditional radio based wireless isn’t allowed
such as aircraft or hospitals .