Chasing Waterfalls: Exploring the airwaves with RTL-SDR
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My Minnebar 9 / 2014 talk about RTL-SDR Video of talk at https://www.youtube.com/watch?v=N2u3Qu1dhAs
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This document provides an overview of software defined cognitive radio concepts, including:
- Basic concepts of software defined radio (SDR) and cognitive radio (CR) and their relationship
- How cognitive radios are implemented through sensing, adaptation, and learning
- Regulatory issues and applications of cognitive radio for interoperability and spectrum access
- Current research challenges in SDR hardware, software architectures, and cognitive radio implementation
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Software defined radio (SDR) moves signal processing from analog hardware to digital software. An SDR receiver can consist simply of an antenna connected to an analog-to-digital converter, with all filtering and detection done digitally. Common types of SDR include inexpensive RTL-SDR devices using DVB-T TV tuners and more full-featured commercial SDR that can handle multiple bands and transmit. SDR requires software to function since processing, filtering and control are performed in software. SDR apps allow similar functionality on smartphones that support USB-OTG connections to SDR devices.
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Software-defined radio (SDR) is a radio communications system that uses software to replace conventional radio hardware, allowing it to be reprogrammed for different frequency bands and standards. The global SDR market is expected to grow from $26.49 billion in 2014 to $13.87 billion in 2020, representing an 11.39% compound annual growth rate. North America currently makes up 26.5% of the SDR market, while military applications account for $694 million in revenue in 2014 growing to $1.32 billion by 2020.
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This document discusses software defined radio (SDR) technology. It begins with an overview of radio technology and terms. It then discusses SDR, explaining that it implements components like mixers, filters, and modulators/demodulators through software instead of hardware. Examples of low-cost SDR devices like the RLT-SDR are provided. The document concludes with a demonstration of listening to signals like FM radio, airplanes, satellites, and wireless networks using SDR software and devices.
Design and implementation of sdr based qpsk transceiver using fpga
Software-defined radio (SDR) technology enables
implementation of wireless devices that support multiple air interfaces and modulation formats, which is very important
if consider the proliferation of wireless standards. To enable such functionality SDR is using reconfigurable hardware platform such as Field Programmable Gate Array (FPGA). In this paper, we present design procedure and implementation result of SDR based QPSK modulator on Altera Cyclone IV FPGA. For design and implementation of QPSK modulator we used Altera DSP
Builder Tool combined with Matlab/Simulink, Modelsim and
Quartus II design tools. As reconfigurable hardware platform
we used Altera DE2-115 development and education board with
AD/DA daughter card. Software and Hardware-in-the-loop (HIL)
simulation was conducted before hardware implementation and
verification of designed system. This method of design makes
implementation of SDR based modulators simpler ad faster.
Index Terms—SDR, FPGA, QPSK, DSP Builder, NCO, RRC
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This document provides an overview of software-defined radio (SDR), including its definition, history, advantages, technical overview, and architecture. SDR is defined as a radio system where components typically implemented in hardware, such as mixers and filters, are instead implemented through software. The term was coined in 1991, with an early military project in 1992. SDR provides advantages like complete digital baseband processing and faster software prototyping. Its technical overview describes ideal SDR components and practical implementations using digital signal processing and field-programmable gate arrays.
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- Basic concepts of software defined radio (SDR) and cognitive radio (CR) and their relationship
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- Regulatory issues and applications of cognitive radio for interoperability and spectrum access
- Current research challenges in SDR hardware, software architectures, and cognitive radio implementation
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Software defined radio (SDR) moves signal processing from analog hardware to digital software. An SDR receiver can consist simply of an antenna connected to an analog-to-digital converter, with all filtering and detection done digitally. Common types of SDR include inexpensive RTL-SDR devices using DVB-T TV tuners and more full-featured commercial SDR that can handle multiple bands and transmit. SDR requires software to function since processing, filtering and control are performed in software. SDR apps allow similar functionality on smartphones that support USB-OTG connections to SDR devices.
Software-defined radio: The Wireless Revolution
Software-defined radio (SDR) is a radio communications system that uses software to replace conventional radio hardware, allowing it to be reprogrammed for different frequency bands and standards. The global SDR market is expected to grow from $26.49 billion in 2014 to $13.87 billion in 2020, representing an 11.39% compound annual growth rate. North America currently makes up 26.5% of the SDR market, while military applications account for $694 million in revenue in 2014 growing to $1.32 billion by 2020.
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This document discusses software defined radio (SDR) technology. It begins with an overview of radio technology and terms. It then discusses SDR, explaining that it implements components like mixers, filters, and modulators/demodulators through software instead of hardware. Examples of low-cost SDR devices like the RLT-SDR are provided. The document concludes with a demonstration of listening to signals like FM radio, airplanes, satellites, and wireless networks using SDR software and devices.
Design and implementation of sdr based qpsk transceiver using fpga
Software-defined radio (SDR) technology enables
implementation of wireless devices that support multiple air interfaces and modulation formats, which is very important
if consider the proliferation of wireless standards. To enable such functionality SDR is using reconfigurable hardware platform such as Field Programmable Gate Array (FPGA). In this paper, we present design procedure and implementation result of SDR based QPSK modulator on Altera Cyclone IV FPGA. For design and implementation of QPSK modulator we used Altera DSP
Builder Tool combined with Matlab/Simulink, Modelsim and
Quartus II design tools. As reconfigurable hardware platform
we used Altera DE2-115 development and education board with
AD/DA daughter card. Software and Hardware-in-the-loop (HIL)
simulation was conducted before hardware implementation and
verification of designed system. This method of design makes
implementation of SDR based modulators simpler ad faster.
Index Terms—SDR, FPGA, QPSK, DSP Builder, NCO, RRC
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This document provides an overview of software-defined radio (SDR), including its definition, history, advantages, technical overview, and architecture. SDR is defined as a radio system where components typically implemented in hardware, such as mixers and filters, are instead implemented through software. The term was coined in 1991, with an early military project in 1992. SDR provides advantages like complete digital baseband processing and faster software prototyping. Its technical overview describes ideal SDR components and practical implementations using digital signal processing and field-programmable gate arrays.
Software Defined Radio
This document presents a presentation on software defined radio (SDR). It begins with an introduction that defines SDR and discusses its history. The methods section explains how SDR works, including its architecture and use of software common architecture and CORBA. It also discusses available tools like GNU Radio and USRP. The results section covers standards and applications of SDR. The discussion section highlights benefits, disadvantages, challenges and conclusions regarding SDR. Overall, the presentation provides a high-level overview of SDR, how it functions, examples of its applications, and considerations.
Situation Review: SDR Transceivers
This presentation is a great overview about the capabilities and shortfalls of current SDR Transceivers. The presentation was created and presented by Claudio, I4LEC in September 2012 at the HamRadioWeb Convention in Bologna, Italy.
Software defined radio
Software defined radio uses software to control radio functions like modulation and demodulation rather than using dedicated hardware components. It allows a software radio to function as different types of radios through software changes alone. This reduces costs compared to hardware radios and makes radios more flexible and upgradable. Software defined radios achieve this by sampling radio signals digitally and performing signal processing using software on a general purpose processor or computer rather than dedicated circuits.
Hardware Accelerated Software Defined Radio
Advanced 5G wireless infrastructure should support any-to-any connectivity between densely arranged smart objects that form the emerging paradigm known as the Internet of Everything (IoE). While traditional wireless networks enable communication between devices using a single technology, 5G networks will need to support seamless connectivity between heterogeneous wireless objects, and consequently enable the proliferation of IoE networks. To tackle the complexity and versatility of the future IoE networks, 5G has to guarantee optimal usage of both spectrum and energy resources and further support technology-agnostic connectivity between objects. This can be realized by combining intelligent network control with adaptive software-defined air interfaces. In order to achieve this, current radio technology paradigms like Cloud RAN and Software Defined Radio (SDR) utilize centralized baseband signal processing mainly performed in software. With traditional SDR platforms, composed of separate radio and host commodity computer units, computationally-intensive signal processing algorithms and high-throughput connectivity between processing units are hard to realize. In addition, significant power consumption and large form factor may preclude any real-life deployment of such systems. On the other hand, modern hybrid FPGA technology tightly couples a FPGA fabric with hard core CPU on a single chip. This provides opportunities for implementing air interfaces based on hardware/software co-processing, resulting in increased processing throughput, reduced form factor and power consumption, while at the same time preserving flexibility. This paper examines how hybrid FPGAs can be combined with novel ideas such as RF Network-on-Chip (RFNoC) and partial reconfiguration, to form a flexible and compact platform for implementing low-power adaptive air interfaces. The proposed platform merges software and hardware processing units of SDR systems on a single chip. Therefore, it can provide interfaces for on-the-fly composition and reconfiguration of software and hardware radio modules. The resulting system enables the abstraction of air interfaces, where each access technology is composed of a structured sequence of modular radio processing units.
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Software defined radios (SDR) use software to control radio functions like filtering, frequency coverage, and modulation modes. This flexibility allows SDRs to change how they operate through software updates rather than hardware changes. Key benefits are low cost since most functions are done in software, and versatility to support different communication standards worldwide. The goal of SDR is to have a single transceiver that can work as different devices like phones or radios through software reconfiguration alone. Hobbyists can use inexpensive SDRs and decoding software to track ships by receiving automatic identification system signals.
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Software defined radios (SDR) use software to control radio functions like filtering, frequency coverage, and modulation modes. This flexibility allows SDRs to change how they operate through software updates rather than hardware changes. Key benefits are low cost since most functions are done in software, and versatility to support different communication standards worldwide. The goal of SDR is to have a single transceiver that can work as different devices like phones or radios through software reconfiguration alone. Hobbyists can use inexpensive SDRs and decoding software to track ships by receiving automatic identification system signals.
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This document discusses the implementation of 4PSK modulation and demodulation for software defined radio using an FPGA. It begins by explaining what software defined radio is and how it differs from traditional hardware radios by implementing signal processing in software. The document then discusses the issues with traditional radios and how SDR provides a more flexible solution. It aims to develop and deploy a 4PSK waveform on an FPGA for an SDR platform and evaluate performance using BER, eye diagrams and constellation diagrams. The future scope of using SDR for both defense and commercial applications is also mentioned.
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This document discusses software defined radio (SDR) technology. SDR uses software modules running on generic hardware like DSPs and microprocessors to implement radio functions rather than using dedicated hardware components. This allows radios to have their functionality redefined or upgraded through changes to its software. The document outlines the architecture of SDR systems and provides examples of SDR applications in areas like public safety, military uses, and commercial devices. It also discusses benefits such as flexibility and interoperability as well as challenges related to hardware limitations and software complexity. The future scope of SDR is seen to include adaptive radios and cognitive radios that can dynamically change their transmission behavior.
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This presentation delves into the development of a system designed to mimic Galileo's Open Service signal using software-defined radio (SDR) technology. We'll begin with a foundational overview of both Global Navigation Satellite Systems (GNSS) and the intricacies of digital signal processing.
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For the upcoming meetup we are organizing, we have an exciting lineup of activities planned:
-Insightful presentations covering two practical applications of the Power Grid Model.
-An update on the latest advancements in Power Grid -Model technology during the first and second quarters of 2024.
-An interactive brainstorming session to discuss and propose new feature requests.
-An opportunity to connect with fellow Power Grid Model enthusiasts and users.
What is an RPA CoE? Session 1 – CoE Vision
In the first session, we will review the organization's vision and how this has an impact on the COE Structure.
Topics covered:
• The role of a steering committee
• How do the organization’s priorities determine CoE Structure?
Speaker:
Chris Bolin, Senior Intelligent Automation Architect Anika Systems
Leveraging the Graph for Clinical Trials and Standards
Katja Glaß
OpenStudyBuilder Community Manager - Katja Glaß Consulting
Marius Conjeaud
Principal Consultant - Neo4j
Digital Banking in the Cloud: How Citizens Bank Unlocked Their Mainframe
Inconsistent user experience and siloed data, high costs, and changing customer expectations – Citizens Bank was experiencing these challenges while it was attempting to deliver a superior digital banking experience for its clients. Its core banking applications run on the mainframe and Citizens was using legacy utilities to get the critical mainframe data to feed customer-facing channels, like call centers, web, and mobile. Ultimately, this led to higher operating costs (MIPS), delayed response times, and longer time to market.
Ever-changing customer expectations demand more modern digital experiences, and the bank needed to find a solution that could provide real-time data to its customer channels with low latency and operating costs. Join this session to learn how Citizens is leveraging Precisely to replicate mainframe data to its customer channels and deliver on their “modern digital bank” experiences.
Main news related to the CCS TSI 2023 (2023/1695)
An English 🇬🇧 translation of a presentation to the speech I gave about the main changes brought by CCS TSI 2023 at the biggest Czech conference on Communications and signalling systems on Railways, which was held in Clarion Hotel Olomouc from 7th to 9th November 2023 (konferenceszt.cz). Attended by around 500 participants and 200 on-line followers.
The original Czech 🇨🇿 version of the presentation can be found here: https://www.slideshare.net/slideshow/hlavni-novinky-souvisejici-s-ccs-tsi-2023-2023-1695/269688092 .
The videorecording (in Czech) from the presentation is available here: https://youtu.be/WzjJWm4IyPk?si=SImb06tuXGb30BEH .
HCL Notes and Domino License Cost Reduction in the World of DLAU
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-and-domino-license-cost-reduction-in-the-world-of-dlau/
The introduction of DLAU and the CCB & CCX licensing model caused quite a stir in the HCL community. As a Notes and Domino customer, you may have faced challenges with unexpected user counts and license costs. You probably have questions on how this new licensing approach works and how to benefit from it. Most importantly, you likely have budget constraints and want to save money where possible. Don’t worry, we can help with all of this!
We’ll show you how to fix common misconfigurations that cause higher-than-expected user counts, and how to identify accounts which you can deactivate to save money. There are also frequent patterns that can cause unnecessary cost, like using a person document instead of a mail-in for shared mailboxes. We’ll provide examples and solutions for those as well. And naturally we’ll explain the new licensing model.
Join HCL Ambassador Marc Thomas in this webinar with a special guest appearance from Franz Walder. It will give you the tools and know-how to stay on top of what is going on with Domino licensing. You will be able lower your cost through an optimized configuration and keep it low going forward.
These topics will be covered
- Reducing license cost by finding and fixing misconfigurations and superfluous accounts
- How do CCB and CCX licenses really work?
- Understanding the DLAU tool and how to best utilize it
- Tips for common problem areas, like team mailboxes, functional/test users, etc
- Practical examples and best practices to implement right away
Skybuffer SAM4U tool for SAP license adoption
Manage and optimize your license adoption and consumption with SAM4U, an SAP free customer software asset management tool.
SAM4U, an SAP complimentary software asset management tool for customers, delivers a detailed and well-structured overview of license inventory and usage with a user-friendly interface. We offer a hosted, cost-effective, and performance-optimized SAM4U setup in the Skybuffer Cloud environment. You retain ownership of the system and data, while we manage the ABAP 7.58 infrastructure, ensuring fixed Total Cost of Ownership (TCO) and exceptional services through the SAP Fiori interface.
Driving Business Innovation: Latest Generative AI Advancements & Success Story
Are you ready to revolutionize how you handle data? Join us for a webinar where we’ll bring you up to speed with the latest advancements in Generative AI technology and discover how leveraging FME with tools from giants like Google Gemini, Amazon, and Microsoft OpenAI can supercharge your workflow efficiency.
During the hour, we’ll take you through:
Guest Speaker Segment with Hannah Barrington: Dive into the world of dynamic real estate marketing with Hannah, the Marketing Manager at Workspace Group. Hear firsthand how their team generates engaging descriptions for thousands of office units by integrating diverse data sources—from PDF floorplans to web pages—using FME transformers, like OpenAIVisionConnector and AnthropicVisionConnector. This use case will show you how GenAI can streamline content creation for marketing across the board.
Ollama Use Case: Learn how Scenario Specialist Dmitri Bagh has utilized Ollama within FME to input data, create custom models, and enhance security protocols. This segment will include demos to illustrate the full capabilities of FME in AI-driven processes.
Custom AI Models: Discover how to leverage FME to build personalized AI models using your data. Whether it’s populating a model with local data for added security or integrating public AI tools, find out how FME facilitates a versatile and secure approach to AI.
We’ll wrap up with a live Q&A session where you can engage with our experts on your specific use cases, and learn more about optimizing your data workflows with AI.
This webinar is ideal for professionals seeking to harness the power of AI within their data management systems while ensuring high levels of customization and security. Whether you're a novice or an expert, gain actionable insights and strategies to elevate your data processes. Join us to see how FME and AI can revolutionize how you work with data!
Principle of conventional tomography-Bibash Shahi ppt..pptx
before the computed tomography, it had been widely used.
Freshworks Rethinks NoSQL for Rapid Scaling & Cost-Efficiency
Freshworks creates AI-boosted business software that helps employees work more efficiently and effectively. Managing data across multiple RDBMS and NoSQL databases was already a challenge at their current scale. To prepare for 10X growth, they knew it was time to rethink their database strategy. Learn how they architected a solution that would simplify scaling while keeping costs under control.
AppSec PNW: Android and iOS Application Security with MobSF
Mobile Security Framework - MobSF is a free and open source automated mobile application security testing environment designed to help security engineers, researchers, developers, and penetration testers to identify security vulnerabilities, malicious behaviours and privacy concerns in mobile applications using static and dynamic analysis. It supports all the popular mobile application binaries and source code formats built for Android and iOS devices. In addition to automated security assessment, it also offers an interactive testing environment to build and execute scenario based test/fuzz cases against the application.
This talk covers:
Using MobSF for static analysis of mobile applications.
Interactive dynamic security assessment of Android and iOS applications.
Solving Mobile app CTF challenges.
Reverse engineering and runtime analysis of Mobile malware.
How to shift left and integrate MobSF/mobsfscan SAST and DAST in your build pipeline.
Harnessing the Power of NLP and Knowledge Graphs for Opioid Research
Gursev Pirge, PhD
Senior Data Scientist - JohnSnowLabs
“How Axelera AI Uses Digital Compute-in-memory to Deliver Fast and Energy-eff...
“How Axelera AI Uses Digital Compute-in-memory to Deliver Fast and Energy-eff...Edge AI and Vision Alliance
For the full video of this presentation, please visit: https://www.edge-ai-vision.com/2024/06/how-axelera-ai-uses-digital-compute-in-memory-to-deliver-fast-and-energy-efficient-computer-vision-a-presentation-from-axelera-ai/
Bram Verhoef, Head of Machine Learning at Axelera AI, presents the “How Axelera AI Uses Digital Compute-in-memory to Deliver Fast and Energy-efficient Computer Vision” tutorial at the May 2024 Embedded Vision Summit.
As artificial intelligence inference transitions from cloud environments to edge locations, computer vision applications achieve heightened responsiveness, reliability and privacy. This migration, however, introduces the challenge of operating within the stringent confines of resource constraints typical at the edge, including small form factors, low energy budgets and diminished memory and computational capacities. Axelera AI addresses these challenges through an innovative approach of performing digital computations within memory itself. This technique facilitates the realization of high-performance, energy-efficient and cost-effective computer vision capabilities at the thin and thick edge, extending the frontier of what is achievable with current technologies.
In this presentation, Verhoef unveils his company’s pioneering chip technology and demonstrates its capacity to deliver exceptional frames-per-second performance across a range of standard computer vision networks typical of applications in security, surveillance and the industrial sector. This shows that advanced computer vision can be accessible and efficient, even at the very edge of our technological ecosystem.zkStudyClub - LatticeFold: A Lattice-based Folding Scheme and its Application...
Folding is a recent technique for building efficient recursive SNARKs. Several elegant folding protocols have been proposed, such as Nova, Supernova, Hypernova, Protostar, and others. However, all of them rely on an additively homomorphic commitment scheme based on discrete log, and are therefore not post-quantum secure. In this work we present LatticeFold, the first lattice-based folding protocol based on the Module SIS problem. This folding protocol naturally leads to an efficient recursive lattice-based SNARK and an efficient PCD scheme. LatticeFold supports folding low-degree relations, such as R1CS, as well as high-degree relations, such as CCS. The key challenge is to construct a secure folding protocol that works with the Ajtai commitment scheme. The difficulty, is ensuring that extracted witnesses are low norm through many rounds of folding. We present a novel technique using the sumcheck protocol to ensure that extracted witnesses are always low norm no matter how many rounds of folding are used. Our evaluation of the final proof system suggests that it is as performant as Hypernova, while providing post-quantum security.
Paper Link: https://eprint.iacr.org/2024/257
JavaLand 2024: Application Development Green Masterplan
My presentation slides I used at JavaLand 2024
Choosing The Best AWS Service For Your Website + API.pptx
Have you ever been confused by the myriad of choices offered by AWS for hosting a website or an API?
Lambda, Elastic Beanstalk, Lightsail, Amplify, S3 (and more!) can each host websites + APIs. But which one should we choose?
Which one is cheapest? Which one is fastest? Which one will scale to meet our needs?
Join me in this session as we dive into each AWS hosting service to determine which one is best for your scenario and explain why!
HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAU
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind für viele in der HCL-Community seit letztem Jahr ein heißes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und Lizenzgebühren zu kämpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen!
Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
Diese Themen werden behandelt
- Reduzierung der Lizenzkosten durch Auffinden und Beheben von Fehlkonfigurationen und überflüssigen Konten
- Wie funktionieren CCB- und CCX-Lizenzen wirklich?
- Verstehen des DLAU-Tools und wie man es am besten nutzt
- Tipps für häufige Problembereiche, wie z. B. Team-Postfächer, Funktions-/Testbenutzer usw.
- Praxisbeispiele und Best Practices zum sofortigen Umsetzen
Introduction of Cybersecurity with OSS at Code Europe 2024
I develop the Ruby programming language, RubyGems, and Bundler, which are package managers for Ruby. Today, I will introduce how to enhance the security of your application using open-source software (OSS) examples from Ruby and RubyGems.
The first topic is CVE (Common Vulnerabilities and Exposures). I have published CVEs many times. But what exactly is a CVE? I'll provide a basic understanding of CVEs and explain how to detect and handle vulnerabilities in OSS.
Next, let's discuss package managers. Package managers play a critical role in the OSS ecosystem. I'll explain how to manage library dependencies in your application.
I'll share insights into how the Ruby and RubyGems core team works to keep our ecosystem safe. By the end of this talk, you'll have a better understanding of how to safeguard your code.
Biomedical Knowledge Graphs for Data Scientists and Bioinformaticians
Dmitrii Kamaev, PhD
Senior Product Owner - QIAGEN
Recently uploaded (20)
Leveraging the Graph for Clinical Trials and Standards
Leveraging the Graph for Clinical Trials and Standards
Digital Banking in the Cloud: How Citizens Bank Unlocked Their Mainframe
Digital Banking in the Cloud: How Citizens Bank Unlocked Their Mainframe
HCL Notes and Domino License Cost Reduction in the World of DLAU
HCL Notes and Domino License Cost Reduction in the World of DLAU
Driving Business Innovation: Latest Generative AI Advancements & Success Story
Driving Business Innovation: Latest Generative AI Advancements & Success Story
Principle of conventional tomography-Bibash Shahi ppt..pptx
Principle of conventional tomography-Bibash Shahi ppt..pptx
Freshworks Rethinks NoSQL for Rapid Scaling & Cost-Efficiency
Freshworks Rethinks NoSQL for Rapid Scaling & Cost-Efficiency
AppSec PNW: Android and iOS Application Security with MobSF
AppSec PNW: Android and iOS Application Security with MobSF
Harnessing the Power of NLP and Knowledge Graphs for Opioid Research
Harnessing the Power of NLP and Knowledge Graphs for Opioid Research
“How Axelera AI Uses Digital Compute-in-memory to Deliver Fast and Energy-eff...
“How Axelera AI Uses Digital Compute-in-memory to Deliver Fast and Energy-eff...
zkStudyClub - LatticeFold: A Lattice-based Folding Scheme and its Application...
zkStudyClub - LatticeFold: A Lattice-based Folding Scheme and its Application...
JavaLand 2024: Application Development Green Masterplan
JavaLand 2024: Application Development Green Masterplan
Choosing The Best AWS Service For Your Website + API.pptx
Choosing The Best AWS Service For Your Website + API.pptx
HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAU
HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAU
Introduction of Cybersecurity with OSS at Code Europe 2024
Introduction of Cybersecurity with OSS at Code Europe 2024
Biomedical Knowledge Graphs for Data Scientists and Bioinformaticians
Biomedical Knowledge Graphs for Data Scientists and Bioinformaticians
Chasing Waterfalls: Exploring the airwaves with RTL-SDR
- 3. I'm a radio nerd.
- 4. N0RUA
- 7. 1/5/2013 / ZD7FT / St. Helena Island (6,866 mi)
- 8. 2/23/2014 / RX0AK / Asiatic Russia / 5,460 mi
- 10. Cool experiments
- 12. It's all around us!
- 13. It's all around us! • AM/FM audio broadcast
- 14. It's all around us! • AM/FM audio broadcast • TV broadcast
- 15. It's all around us! • AM/FM audio broadcast • TV broadcast • Cell phones, wifi
- 16. It's all around us! • AM/FM audio broadcast • TV broadcast • Cell phones, wifi • Bluetooth, etc.
- 17. It's all around us! • AM/FM audio broadcast • TV broadcast • Cell phones, wifi • Bluetooth, etc. • But...
- 18. How does it work??
- 19. Components
- 24. Components transducer Oh yeah, the antenna goes here.
- 26. Components transducer Electromagnetic Radiation aka! ~~~ Radio Waves ~~~
- 29. Wavelength
- 30. Wavelength
- 31. Wavelength
- 32. Wavelength
- 33. Frequency
- 34. Hertz = Hz = Cycles per second
- 36. Time! (sec) 1 2 3 f = 1 Hz
- 37. Time! (sec) 1 2 3 f = ~ 4 Hz
- 38. Time! (sec) 1 2 3 Higher Frequency = Shorter Wavelength
- 39. A little math... (I'M REALLY SORRY)
- 42. the speed of light (c) frequency (Hz) λ (m) =
- 44. λ (m) = 300,000,000 89,300,000
- 45. λ (m) = 300,000,000 89,300,000 300 89.3
- 46. λ (m) = 300,000,000 89,300,000 300 89.3 3.35 m ~11 ft
- 47. 300 89.3 3.35 m 300 2400 .125 m ~11 ft ~ 4.9 in
- 48. 300 89.3 3.35 m 300 14.2 21.1 m 300 2400 .125 m ~11 ft~69 ft ~ 4.9 in
- 49. Enough of that..
- 50. 3 kHz - 300 GHz Radio spectrum
- 51. λ = 100 km - 1 mm Radio spectrum
- 56. AM Broadcast! ~ 530 - 1700 kHz = 1170 kHz bandwidth FM Broadcast! 87.5 - 108 MHz = 20.5 MHz bandwidth Wi-Fi/etc! 2.4 - 2.5 GHz = 100 MHz bandwidth
- 57. Modulation
- 58. = encoding information in a signal
- 65. AM
- 66. FM
- 67. Propagation
- 68. Line of Sight
- 69. Groundwave
- 70. Skywave
- 71. Ionosphere 60 - 500 km altitude
- 76. Ionosphere Day
- 77. Ionosphere Day
- 79. F Layer E Layer
- 80. F Layer E Layer
- 81. F Layer E Layer Maximum Usable Frequency (MUF)
- 82. F Layer E Layer
- 83. skip distance
- 84. Auroral
- 85. Meteor Scatter
- 88. WTF's out there? HF/Shortwave • Broadcasters (AM / Shortwave)
- 89. WTF's out there? HF/Shortwave • Broadcasters (AM / Shortwave) • Hams
- 90. WTF's out there? HF/Shortwave • Broadcasters (AM / Shortwave) • Hams • Gov't Agencies (US or otherwise)
- 91. WTF's out there? HF/Shortwave • Broadcasters (AM / Shortwave) • Hams • Gov't Agencies (US or otherwise) • WEFAX, other data & telemetry
- 92. WTF's out there? HF/Shortwave • Broadcasters (AM / Shortwave) • Hams • Gov't Agencies (US or otherwise) • WEFAX, other data & telemetry • "Numbers stations"
- 93. WTF's out there? HF/Shortwave • Broadcasters (AM / Shortwave) • Hams • Gov't Agencies (US or otherwise) • WEFAX, other data & telemetry • "Numbers stations" • Pirates
- 94. WTF's out there? HF/Shortwave • Broadcasters (AM / Shortwave) • Hams • Gov't Agencies (US or otherwise) • WEFAX, other data & telemetry • "Numbers stations" • Pirates • Lots more!
- 96. WTF's out there? VHF/UHF & beyond
- 97. WTF's out there? VHF/UHF & beyond • FM Broadcast
- 98. WTF's out there? VHF/UHF & beyond • FM Broadcast • Hams
- 99. WTF's out there? VHF/UHF & beyond • FM Broadcast • Hams • Fire/Police/EMC/Mall Cops
- 100. WTF's out there? VHF/UHF & beyond • FM Broadcast • Hams • Fire/Police/EMC/Mall Cops • Airport/ATC/ADS-B
- 101. WTF's out there? VHF/UHF & beyond • FM Broadcast • Hams • Fire/Police/EMC/Mall Cops • Airport/ATC/ADS-B • Pagers & other text (Taxi Dispatch)
- 102. WTF's out there? VHF/UHF & beyond • FM Broadcast • Hams • Fire/Police/EMC/Mall Cops • Airport/ATC/ADS-B • Pagers & other text (Taxi Dispatch) • Baby monitors
- 103. WTF's out there? VHF/UHF & beyond • FM Broadcast • Hams • Fire/Police/EMC/Mall Cops • Airport/ATC/ADS-B • Pagers & other text (Taxi Dispatch) • Baby monitors • FUN stuff in the 433 MHz band (unlicensed)
- 108. RTL-SDR
- 114. So what?
- 115. So what? • Hobby
- 116. So what? • Hobby • Experimentation
- 117. So what? • Hobby • Experimentation • Public Service
- 118. So what? • Hobby • Experimentation • Public Service • Cool Gear ;)
- 119. Actual stuff you can do
- 120. Detecting the galactic plane with an SDR
- 122. rtl-sdr.com
- 123. Let's listen to some radio!