Have you ever wondered how information is transmitted using your mobile phone or a WiFi hotspot? Gain an understanding of the basic engineering tools used and tradeoffs encountered in the design of these communication systems. This course is divided into three parts. In Part 1, we examine the point-to-point link, which communicates information from a single transmitter to a single receiver. Part 2 examines how multiple transmitters can share the same physical channel. Part 3 discusses how information can be transmitted reliably from one station to another over a network that connects multiple stations. Online interactive exercises are included to help build your intuition. This course was inspired by and built upon the course 6.02 Digital Communication Systems developed at MIT, which Prof Bertram Shi worked on during his sabbatical in 2009.

Ce cours définit les notions de base des circuits électriques composés des trois éléments passifs (résistance, inductance et condensateur), linéaires et des sources de tension et de courant. On traite ces circuits avec les lois élémentaires de l'électricité puis on développe une série de méthodes de combinaisons des éléments et de transformations du circuit qui mènent à leur simplification et permettent une analyse aisée des courants, tensions et puissances présents. Quelques circuits particuliers classiques sont présentés. Toutes ces méthodes sont premièrement développées en régime continu puis elles sont généralisées au régime alternatif, faisant intervenir le calcul complexe. L'importance du régime alternatif réside dans le fait qu'il est omniprésent au niveau de la distribution électrique domestique et industrielle. This course is presented in French.

Alternating current (AC) is the type of electricity commonly used throughout the world to connect power plants, homes, and businesses. This course will give you an understanding of why AC is used and will allow you to design and analyse circuits which use AC electricity. You will learn how to calculate voltages, currents and power in circuits with AC sources, how to calculate RMS voltage and current, how to handle both sinusoidal and non-sinusoidal sources, how to use relays and transistors as switches, how to design circuits with transformers, how to model realistic, non-ideal transformers, how to design and build simple DC power supplies and rectifiers, and we will explore concepts of maximum power transfer with AC circuits. In terms of sequencing, this course would be suitable for students who already have a working knowledge of basic DC circuits (such as our other MOOC Circuits for Beginners).

With supplementary module on COVID-19 Including our study results, final size estimation for superspreading clusters, the Chinese experience for global preparedness, and more. “If history is our guide, we can assume that the battle between the intellect and will of the human species and the extraordinary adaptability of microbes will be never-ending.” (1) Despite all the remarkable technological breakthroughs that we have made over the past few decades, the threat from infectious diseases has significantly accelerated. In this course, we will learn why this is the case by looking at the fundamental scientific principles underlying epidemics and the public health actions behind their prevention and control in the 21st century. This is the second (spread of infectious diseases) of the four courses, covers these topics: Basic Concepts in Infectious Disease Epidemiology Epidemiologic Triangle: The Pathogen, The Host and The Environment Evidence Synthesis Infectious Disease Modelling 如果历史是我们的向导，我们可以认为人类的智慧和意志与微生物种惊人的适应性之间的斗争将永远持续下去。”(1) 尽管过去的几十年间我们在科技领域取得了令人瞩目的突破，可是传染病对人类的威胁却显著增加。本课程将通过学习流行病学的基础科学原理以及预防与控制流行病的公共卫生措施，对上述现象予以阐释。 这是四個课程中的第二个（傳染病的傳播）： 传染病学的基本概念 流行病学三角模型: 病原体，宿主和环境 证据综合 传染病模型 --------------------------------------------------------------------------------------------------------------------------------------- (1) Fauci AS, Touchette NA, Folkers GK. Emerging Infectious Diseases: a 10-Year Perspective from the National Institute of Allergy and Infectious Diseases. Emerg Infect Dis 2005 Apr; 11(4):519-25.

This course presents critical concepts and practical methods to support planning, collection, storage, and dissemination of data in clinical research. Understanding and implementing solid data management principles is critical for any scientific domain. Regardless of your current (or anticipated) role in the research enterprise, a strong working knowledge and skill set in data management principles and practice will increase your productivity and improve your science. Our goal is to use these modules to help you learn and practice this skill set. This course assumes very little current knowledge of technology other than how to operate a web browser. We will focus on practical lessons, short quizzes, and hands-on exercises as we explore together best practices for data management.

In this Specialization, learners developed and furthered their understanding of the Six Sigma DMAIC process. This Specialization also explored the intersection between Six Sigma and Lean as well as developed enhanced understanding of the DMAIC process beyond the confines of Green Belt instruction by also including content in Organizational Planning and Development, Team Management, and Design for Six Sigma. Applied Learning Project Throughout the Specialization, learners are tasked with the completion of portions of a capstone type peer reviewed project grounded in the DMAIC process and implemented such that the deliverables align with the content presented in the course. Quizzes are also offered to reinforce and cement understanding of the content.

This is CS50's introduction to technology for students who don’t (yet) consider themselves computer persons. Designed for those who work with technology every day but don’t necessarily understand how it all works underneath the hood or how to solve problems when something goes wrong, this course fills in the gaps, empowering you to use and troubleshoot technology more effectively. Through lectures on hardware, the Internet, multimedia, security, programming, and web development, this course equips you for today’s technology and prepares you for tomorrow’s as well.

Why can’t I connect to WiFi? Why does my Bluetooth stop working when I use USB 3.0? Oh! I just sparked into my computer after sitting down; is it damaged now? All of these issues have to do with electromagnetic compatibility (EMC). International EMC experts David Pommerenke and Bernd Deutschmann break down situations that seem highly complex in order to highlight the causes of interference. This course is designed to gain essential know-how in today’s world of very high frequencies. For instance, smartphone CPUs already work with clock frequencies above 3 GHz. But did you know that such fast switching disturbs other devices nearby? Such disturbances are either simply annoying or can become a real problem. As a consequence, international regulations exist which demand for emission and immunity tests before selling an electronic device. The topic of EMC must be considered in all aspects of circuit design in order to reduce the number of prototypes. We would like you to gain an intuition for EMC with the help of lab examples. We emphasize basic physical principles and avoid highly complex mathematical derivations instead. After completion, a certificate will be awarded. We are already working on three follow-up courses to obtain a professional EMC certificate, backed by Graz University of Technology. TU Graz offers more than 10 on-campus lectures on the subject of EMC, most of them in small laboratory groups. More than 10 full-time employees investigate electromagnetism in a variety of applications just in our research group only. We would like to share this expertise with the community, since EMC must be considered by all electronics engineers and project managers. The FREE version of this course includes all material except final exam questions and the certificate. This is a self-paced course, so there are no weekly deadlines. You can join this class completely free of charge and purchase the certificate later in case you liked it. Give it a try and dive into the fascinating world of EMC.

Microprocessors are an incredibly useful tool because they are cheap, flexible, and allow you to control physical systems in powerful ways. In this class, you will learn to build microprocessors as well as to program and build systems from them.

Want to learn how to construct an amplifier for mobile phones? Wondering how energy storage elements like capacitors and inductors work, or how to make microchips run faster? This free circuits course taught by edX CEO and MIT Professor Anant Agarwal and colleagues is for you. This is the second of three online Circuits and Electronics courses and is taken by all MIT Electrical Engineering and Computer Science (EECS) majors. Topics covered include: MOSFET large signal and small signal analysis; amplifiers; energy storage elements like capacitors and inductors; and dynamics of first-order networks and circuit speed. Design and lab exercises are also significant components of the course. Weekly coursework includes interactive video sequences, readings from the textbook, homework, online laboratories, and optional tutorials. The course will also have a final exam. This is a self-paced course, so there are no weekly deadlines. However, all assignments are due when the course ends.