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Learn how to solve real-world data problems using machine learning and RPurchase of the print or Kindle book includes a…
free eBook in PDF format.Key FeaturesThe 10th Anniversary Edition of the bestselling R machine learning book, updated with 50% new content for R 4.0.0 and beyondHarness the power of R to build flexible, effective, and transparent machine learning modelsLearn quickly with this clear, hands-on guide by machine learning expert Brett LantzBook DescriptionMachine learning, at its core, is concerned with transforming data into actionable knowledge. R offers a powerful set of machine learning methods to quickly and easily gain insight from your data. Machine Learning with R, Fourth Edition, provides a hands-on, accessible, and readable guide to applying machine learning to real-world problems. Whether you are an experienced R user or new to the language, Brett Lantz teaches you everything you need to know for data pre-processing, uncovering key insights, making new predictions, and visualizing your findings. This 10th Anniversary Edition features several new chapters that reflect the progress of machine learning in the last few years and help you build your data science skills and tackle more challenging problems, including making successful machine learning models and advanced data preparation, building better learners, and making use of big data.You'll also find this classic R data science book updated to R 4.0.0 with newer and better libraries, advice on ethical and bias issues in machine learning, and an introduction to deep learning. Whether you're looking to take your first steps with R for machine learning or making sure your skills and knowledge are up to date, this is an unmissable read that will help you find powerful new insights in your data.What you will learnLearn the end-to-end process of machine learning from raw data to implementationClassify important outcomes using nearest neighbor and Bayesian methodsPredict future events using decision trees, rules, and support vector machinesForecast numeric data and estimate financial values using regression methodsModel complex processes with artificial neural networksPrepare, transform, and clean data using the tidyverseEvaluate your models and improve their performanceConnect R to SQL databases and emerging big data technologies such as Spark, Hadoop, H2O, and TensorFlowWho this book is forThis book is designed to help data scientists, actuaries, data analysts, financial analysts, social scientists, business and machine learning students, and any other practitioners who want a clear, accessible guide to machine learning with R. No R experience is required, although prior exposure to statistics and programming is helpful.Learn IT security essentials and prepare for the Security+ exam with this CompTIA exam guide, complete with additional online resources—including…
flashcards, PBQs, and mock exams—at securityplus.trainingKey FeaturesWritten by Ian Neil, one of the world's top CompTIA Security+ trainersTest your knowledge of cybersecurity jargon and acronyms with realistic exam questionsLearn about cryptography, encryption, and security policies to deliver a robust infrastructureBook DescriptionThe CompTIA Security+ certification validates the fundamental knowledge required to perform core security functions and pursue a career in IT security. Authored by Ian Neil, a world-class CompTIA certification trainer, this book is a best-in-class study guide that fully covers the CompTIA Security+ 601 exam objectives. Complete with chapter review questions, realistic mock exams, and worked solutions, this guide will help you master the core concepts to pass the exam the first time you take it. With the help of relevant examples, you'll learn fundamental security concepts from certificates and encryption to identity and access management (IAM). As you progress, you'll delve into the important domains of the exam, including cloud security, threats, attacks and vulnerabilities, technologies and tools, architecture and design, risk management, cryptography, and public key infrastructure (PKI). You can access extra practice materials, including flashcards, performance-based questions, practical labs, mock exams, key terms glossary, and exam tips on the author's website at securityplus.training. By the end of this Security+ book, you'll have gained the knowledge and understanding to take the CompTIA exam with confidence.What you will learnMaster cybersecurity fundamentals, from the CIA triad through to IAMExplore cloud security and techniques used in penetration testingUse different authentication methods and troubleshoot security issuesSecure the devices and applications used by your companyIdentify and protect against various types of malware and virusesProtect yourself against social engineering and advanced attacksUnderstand and implement PKI conceptsDelve into secure application development, deployment, and automationWho this book is forIf you want to take and pass the CompTIA Security+ SY0-601 exam, even if you are not from an IT background, this book is for you. You'll also find this guide useful if you want to become a qualified security professional. This CompTIA book is also ideal for US Government and US Department of Defense personnel seeking cybersecurity certification.Get started with creating intuitive native user interfaces on Android platformsKey FeaturesUnderstand the difference between the imperative (Android View) and…
declarative (Jetpack Compose) approachLearn about the structure of a Compose app, built-in Compose UI elements, and core concepts such as state hoisting and composition over inheritanceWrite, test, and debug composable functionsBook DescriptionJetpack Compose is Android's new framework for building fast, beautiful, and reliable native user interfaces. It simplifies and significantly accelerates UI development on Android using the declarative approach. This book will help developers to get hands-on with Jetpack Compose and adopt a modern way of building Android applications. The book is not an introduction to Android development, but it will build on your knowledge of how Android apps are developed.Complete with hands-on examples, this easy-to-follow guide will get you up to speed with the fundamentals of Jetpack Compose such as state hoisting, unidirectional data flow, and composition over inheritance and help you build your own Android apps using Compose. You'll also cover concepts such as testing, animation, and interoperability with the existing Android UI toolkit.By the end of the book, you'll be able to write your own Android apps using Jetpack Compose.What you will learnGain a solid understanding of the core concepts of Jetpack ComposeDevelop beautiful, neat, and immersive UI elements that are user friendly, reliable, and performantBuild a complete app using Jetpack ComposeAdd Jetpack Compose to your existing Android applicationsTest and debug apps that use Jetpack ComposeFind out how Jetpack Compose can be used on other platformsWho this book is forThis book is for any mobile app developer looking to understand the fundamentals of the new Jetpack Compose framework and the benefits of native development. A solid understanding of Android app development, along with some knowledge of the Kotlin programming language, will be beneficial. Basic programming knowledge is necessary to grasp the concepts covered in this book effectively.Learn the core concepts of geospatial data analysis for building actionable and insightful GIS applications Key Features Create GIS solutions…
using the new features introduced in Python 3.7 Explore a range of GIS tools and libraries such as PostGIS, QGIS, and PROJ Learn to automate geospatial analysis workflows using Python and Jupyter Book Description Geospatial analysis is used in almost every domain you can think of, including defense, farming, and even medicine. With this systematic guide, you'll get started with geographic information system (GIS) and remote sensing analysis using the latest features in Python. This book will take you through GIS techniques, geodatabases, geospatial raster data, and much more using the latest built-in tools and libraries in Python 3.7. You'll learn everything you need to know about using software packages or APIs and generic algorithms that can be used for different situations. Furthermore, you'll learn how to apply simple Python GIS geospatial processes to a variety of problems, and work with remote sensing data. By the end of the book, you'll be able to build a generic corporate system, which can be implemented in any organization to manage customer support requests and field support personnel. What you will learn Automate geospatial analysis workflows using Python Code the simplest possible GIS in just 60 lines of Python Create thematic maps with Python tools such as PyShp, OGR, and the Python Imaging Library Understand the different formats that geospatial data comes in Produce elevation contours using Python tools Create flood inundation models Apply geospatial analysis to real-time data tracking and storm chasing Who this book is for This book is for Python developers, researchers, or analysts who want to perform geospatial modeling and GIS analysis with Python. Basic knowledge of digital mapping and analysis using Python or other scripting languages will be helpful.Learn C# programming from scratch using Unity as a fun and accessible entry point with this updated edition of the…
bestselling series.Includes invitation to join the online Unity Game Development community to read the book alongside peers, Unity developers/C# programmers and Harrison Ferrone.Key FeaturesDevelop a strong foundation of programming concepts and the C# languageBecome confident with Unity fundamentals and features in line with Unity 2022Build a playable game prototype in Unity—a working first-person shooter game prototypeBook DescriptionIt's the ability to write custom C# scripts for behaviors and game mechanics that really takes Unity the extra mile. That's where this book can help you as a new programmer! Harrison Ferrone, in this seventh edition of the bestselling series, will take you through the building blocks of programming and the C# language from scratch while building a fun and playable game prototype in Unity. This book will teach you the fundamentals of OOPs, basic concepts of C#, and Unity engine with lots of code samples, exercises and tips to go beyond the book with your work. You will write C# scripts for simple game mechanics, perform procedural programming, and add complexity to your games by introducing intelligent enemies and damage-dealing projectiles. You will explore the fundamentals of Unity game development, including game design, lighting basics, player movement, camera controls, collisions, and more with every passing chapter. Note: The screenshots in the book display the Unity editor in full-screen mode for a comprehensive view. Users can easily reference color versions of images by downloading them from the GitHub repository or the graphics bundle linked in the book. What you will learnUnderstanding programming fundamentals by breaking them down into their basic partsComprehensive explanations with sample codes of object-oriented programming and how it applies to C#Follow simple steps and examples to create and implement C# scripts in UnityDivide your code into pluggable building blocks using interfaces, abstract classes, and class extensionsGrasp the basics of a game design document and then move on to blocking out your level geometry, adding lighting and a simple object animationCreate basic game mechanics such as player controllers and shooting projectiles using C#Become familiar with stacks, queues, exceptions, error handling, and other core C# conceptsLearn how to handle text, XML, and JSON data to save and load your game dataWho this book is forIf you're a developer, programmer, hobbyist, or anyone who wants to get started with Unity and C# programming in a fun and engaging manner, this book is for you. You'll still be able to follow along if you don't have programming experience, but knowing the basics will help you get the most out of this book.Build scalable and production-ready infrastructure in Amazon Web Services with CloudFormation Key Features Leverage AWS CloudFormation templates to manage your…
entire infrastructure Get up and running with writing your infrastructure as code and automating your environment Simplify infrastructure management and increase productivity with AWS CloudFormation Book Description DevOps and the cloud revolution have forced software engineers and operations teams to rethink how to manage infrastructures. With this AWS book, you'll understand how you can use Infrastructure as Code (IaC) to simplify IT operations and manage the modern cloud infrastructure effectively with AWS CloudFormation. This comprehensive guide will help you explore AWS CloudFormation from template structures through to developing complex and reusable infrastructure stacks. You'll then delve into validating templates, deploying stacks, and handling deployment failures. The book will also show you how to leverage AWS CodeBuild and CodePipeline to automate resource delivery and apply continuous integration and continuous delivery (CI/CD) practices to the stack. As you advance, you'll learn how to generate templates on the fly using macros and create resources outside AWS with custom resources. Finally, you'll improve the way you manage the modern cloud in AWS by extending CloudFormation using AWS serverless application model (SAM) and AWS cloud development kit (CDK). By the end of this book, you'll have mastered all the major AWS CloudFormation concepts and be able to simplify infrastructure management. What you will learn Understand modern approaches to IaC Develop universal and reusable CloudFormation templates Discover ways to apply continuous delivery with CloudFormation Implement IaC best practices for the AWS Cloud Provision massive applications across multiple regions and accounts Automate template generation and software provisioning for AWS Extend CloudFormation with custom resources and template macros Who this book is for If you are a developer who wants to learn how to write templates, a DevOps engineer interested in deployment and orchestration, or a solutions architect looking to understand the benefits of managing infrastructure with ease, this book is for you. Prior understanding of the AWS Cloud is necessary.Discover the secrets to creating cutting-edge, compelling full stack applications using Spring Boot and React's rich and varied toolsetsKey FeaturesUtilize…
Spring Boot to make powerful, complex, and secure backends for your applicationsLeverage React's full arsenal of tools for building slick, high-performance frontendsBuild modern, scalable full stack applications that comfortably meet the demands of your usersBook DescriptionGetting started with full stack development can be daunting. Even developers who are familiar with the best tools, such as Spring Boot and React, can struggle to nail the basics, let alone master the more advanced elements. If you're one of these developers, this comprehensive guide covers everything you need!This updated edition of the Full Stack Development with Spring Boot 2 and React book will take you from novice to proficient in this expansive domain. Taking a practical approach, this book will first walk you through the latest Spring Boot features for creating a robust backend, covering everything from setting up the environment and dependency injection to security and testing.Once this has been covered, you'll advance to React frontend programming. If you've ever wondered about custom Hooks, third-party components, and MUI, this book will demystify all that and much more. You'll explore everything that goes into developing, testing, securing, and deploying your applications using all the latest tools from Spring Boot, React, and other cutting-edge technologies.By the end of this book, you'll not only have learned the theory of building modern full stack applications but also have developed valuable skills that add value in any setting.What you will learnMake fast and RESTful web services powered by Spring Data RESTCreate and manage databases using ORM, JPA, Hibernate, and moreExplore the use of unit tests and JWTs with Spring SecurityEmploy React Hooks, props, states, and more to create your frontendDiscover a wide array of advanced React and third-party componentsBuild high-performance applications complete with CRUD functionalityHarness MUI to customize your frontendTest, secure, and deploy your applications with high efficiencyWho this book is forThis book is for Java developers who are familiar with Spring Boot but don't know where to start when it comes to building full stack applications. You'll also find this book useful if you're a frontend developer with knowledge of JavaScript basics looking to learn full stack development or a full stack developer experienced in other technology stacks looking to learn a new one.Computer Vision and Robotics: Proceedings of CVR 2023 (Algorithms for Intelligent Systems)
Par Andries Engelbrecht, Praveen Kumar Shukla, Himanshu Mittal. 2023
This book consists of a collection of the high-quality research articles in the field of computer vision and robotics which…
are presented in the International Conference on Computer Vision and Robotics (CVR 2023), organized by BBD University Lucknow, India, during 24–25 February 2023. The book discusses applications of computer vision and robotics in the fields like medical science, defence, and smart city planning. The book presents recent works from researchers, academicians, industry, and policy makers.This book constitutes the proceedings of the 30th International Conference on Web Services, ICWS 2023, held as Part of the…
Services Conference Federation, SCF 2023, held in Honolulu, HI, USA, in September 2023. The 7 full papers and one short paper presented in this volume were carefully reviewed and selected from 14 submissions. The papers cover topics in the field of: research track; application and industry track and short paper track.The International Conference on Web Services (ICWS) has been a prime international forum for both researchers and industry practitioners to exchange the latest fundamental advances in the state of the art and practice of Web-based services, identify emerging research topics, and define the future of Web-based services. All topics regarding Internet/Web services lifecycle study and management align with the theme of ICWS.Technische Maßnahmen, die es Cyberangreifern schwer machen, dienen zur Abschreckung, weil Hacker immer nur so hoch springen, wie sie müssen.…
Bei komplexen und vor allem sicherheitsrelevanten IT-Infrastrukturen reichen diese technischen Maßnahmen allein jedoch oft nicht aus.Dieses Lehrbuch betrachtet alle Aspekte der IT-Sicherheit und effektive Maßnahmen, um Angriffe zu detektieren und sich erfolgreich dagegen zu wehren. Es behandelt allgemeine Angriffsmechanismen und Angriffsszenarien, die von Angreifern angewendet werden. Dabei soll klar werden, dass es nicht ausreichend ist, Firewall-Regeln sauber zu konfigurieren oder die aktuellsten Patches einzuspielen. Vielmehr muss ein ganzheitlicher Ansatz gewählt werden, der Nutzende einschließt (Awareness) und funktionierende Prozesse für den Fall eines konkreten Angriffs etabliert. Das Buch zeigt, wo die Schwachstellen liegen, wie man sie schließt, wie man Angriffe erkennt und wie man sie erfolgreich abwehrt.Transactions on Large-Scale Data- and Knowledge-Centered Systems LV (Lecture Notes in Computer Science #14280)
Par Abdelkader Hameurlain, A Min Tjoa. 2023
The LNCS journal Transactions on Large-scale Data and Knowledge-centered Systems focuses on data management, knowledge discovery, and knowledge processing, which…
are core and hot topics in computer science. Since the 1990s, the Internet has become the main driving force behind application development in all domains. An increase in the demand for resource sharing across different sites connected through networks has led to an evolution of data- and knowledge-management systems from centralized systems to decentralized systems enabling large-scale distributed applications providing high scalability.This, the 55th issue of Transactions on Large-Scale Data and Knowledge-Centered Systems, contains five fully revised regular papers covering a wide range of very hot topics in the fields of data driven science life science, workflows, weak signals, online social networks, root cause analysis, detected anomalies, analysis of interplanetary file systems, concept weighting in knowledge graphs, and neural networks.Advancement of GI-Science and Sustainable Agriculture: A Multi-dimensional Approach (GIScience and Geo-environmental Modelling)
Par Jayanta Das, Somenath Halder. 2023
This book describes the contributing aspects of contemporary developments related to sustainable agricultural resources and assessment of sustainable agriculture in…
developing nations. The issues like food crisis and declining agro-productivity, post-pandemic food security, zonation and mapping technique viewing food crisis, biotechnology and sustainable agricultural, scaling hunger indices, health hazard and food crisis, changing climate and food availability, consumer load and fertilizer usage, growing demand and increasing usage of harmful chemical in agro-fields are regarded as serious concerns. Thereafter, the scope of sustainable agricultural potentiality (SAP) modeling, amidst the arena of deforestation and encroachment of new cultivable land, impact of pandemic on sustainable agriculture, using wastewater as non-sustainable agricultural practice, applying geospatial techniques on extreme weather susceptibility and agro-production, soil erosion and poor agricultural production, questioning shifting cultivation on the issue of sustainability, meteorological drought and irrigational gaps, occupational mobility and loss of agricultural heritage, farm-excreta burning and air quality index (AQI), GI-Science and sustainable agro-management, community preparedness in food crisis management, multi-criteria hunger index (MCHI), climate change declining sustainable agro-production are worth some. Almost the entire world has recently suffered from several natural and human-induced problems, among which food crisis and unsustainable agriculture throw significant challenges to human society. Contrastingly, if modern technology and means, with advanced monitoring and calibration methodology and policy guidance, can help, it will undoubtedly reduce half of the world's problems and ensure the future survival of human society. In addition, this approach also can minimize the other partially linked problems, like climate change and food shortage, livelihood crisis, environmental refugees, international trade balance, global food supply chain interruption, the ever-expanding gap between rich and poor, and so on. Therefore, properly nurturing the knowledge on the application of GI-Science for an agriculturally sustainable society and their monitoring and management can curtail the gap between science, policy, and the ground-level scenario concerned.Young Geographers: Showcasing Research Contributions in Geography (Key Challenges in Geography)
Par Gert Ruepert, Tijana Ilić. 2023
This book shows an updated overview of research about human geography topics like urban growth/urban challenges, transportation, landscape, land cover,…
geospatial analysis, regional planning/local development, cultural geography, tourism, and so on. Between 2020 and 2022, due to COVID-19 and lockdowns worldwide, there were fewer opportunities for young and upcoming researchers to present their state-of-the-art findings at conferences. In order to highlight exceptional research of young geographers during this time, the idea for this book was created. In collaboration with the EGEA alumni foundation for students and young geographers, 12 authors were selected to showcase their scientific work. In addition to that, most of them present amazing maps and figures as outstanding expression of the need of GIS for geography research.Internet of Medical Things: Paradigm of Wearable Devices (Internet of Everything (IoE))
Par Vijender Kumar Solanki, Manuel Cardona, Cecilia E. García. 2021
Internet of Things (IoT) has become a valuable tool for connection and information exchange between devices. This book provides a…
brief introduction to this new field, focuses on wearable medical devices, and covers the basic concepts by providing the reader with enough information to solve various practical problems. This book provides the latest applications, experiments, fundamentals concepts, and cutting-edge topics for the ehealth and wearable devices field. The book also offers topics related to Security in IoT and Wearable Devices, Wearable Devices and Internet of Medical Devices (IoMT), IoT for Medical Applications, and Tools and study cases. The book brings new and valuable information to PhD researchers, students, professors, and professionals working in IoT and related fields.Access Services: The Convergence of Reference and Technical Services
Par Gillian M. McCombs. 1992
This book takes a close look at the recent changing emphasis from collections to access, and from document description to…
document delivery. As the automation of library processes has moved from technical services to reference services, the roles of the professionals working in those capacities have changed dramatically. Library administrators who are looking to redeploy resources will gain helpful insights from the experiences of librarians who have already redirected their organizations. This helpful volume will be of tremendous assistance in redefining the traditional roles of reference and technical librarians. Access Services offers new insights into the movement from bibliographic access to information access that is reshaping reference services today. Informative discussions on topics such as cross-training experiments, revised organizational structures, the new role of the bibliographic utilities, library school education for the redefined professional, and changes in cataloging codes reveal what impact this trend has for librarians, services, and patrons.Creating Second Lives: Community, Identity and Spatiality as Constructions of the Virtual (Routledge Studies in New Media and Cyberculture)
Par Astrid Ensslin, Eben Muse. 2011
This book aims to provide insights into how ‘second lives’ in the sense of virtual identities and communities are constructed…
textually, semiotically and discursively, specifically in the online environment Second Life and Massively Multiplayer Online Games such as World of Warcraft. The book’s philosophy is multi-disciplinary and its goal is to explore the question of how we as gamers and residents of virtual worlds construct alternative online realities in a variety of ways. Of particular significance to this endeavour are conceptions of the body in cyberspace and of spatiality, which manifests itself in ‘natural’ and built environments as well as the triad of space, place and landscape. The contributors’ disciplinary backgrounds include media, communication, cultural and literary studies, and they examine issues of reception and production, identity, community, gender, spatiality, natural and built environments using a plethora of methodological approaches ranging from theoretical and philosophical contemplation through social semiotics to corpus-based discourse analysis."I can't do that until I've lost a bit of weight". "I need to slim down first". "When I'm thinner…
I'll..."What if you didn't feel held back by your body? This guide helps you to free yourself from harmful social attitudes about weight and to start living now.Break the Binds of Weight Stigma draws on Acceptance and Commitment Therapy (ACT), a positive, action-based form of therapy that works by accepting your natural emotions and using your own personal values to build a path to the life you want to live. Stories, worksheets, reflection questions, and guided exercises show you how to embrace yourself and fight back against the social structures that tie value to size. This is not a book about changing your body or losing weight. It's a guide to help you connect with the things that are important to you regardless of your weight. It's a step towards countering the harmful messages in society about our bodies. It's a movement. It's radical. It's freedom.Viele der wichtigsten Technologiekonzerne der Welt bieten Lösungen für mobile Applikationen an, die inzwischen auch zum Entwickeln für andere Zielplattformen…
als iOS und Android nutzbar sind. Sowohl der Begriff App als auch damit verbundene Technologien wachsen über die Welt der mobilen Endgeräte hinaus. Vor diesem Hintergrund präsentiert dieses Buch das nötige Wissen über den gesamten Entwicklungsprozess einer App von der Konzeption bis zur Umsetzung und Inbetriebnahme. In der Konzeption werden empfohlene Methoden des International Requirements Engineering Boards und aus dem Standard Essence genutzt. Für die Umsetzung wiederum werden die Technologien .NET MAUI und ergänzend Comet betrachtet, worüber auch eine optionale einfache Einarbeitung in SwiftUI, Jetpack Compose und Flutter möglich ist.Frühere Versionen dieses Buches sind unter den Titeln „Konzeption und Umsetzung mobiler Applikationen“ und „App Engineering“ für den BoD-Verlag erschienen.Recent Challenges in Intelligent Information and Database Systems: 15th Asian Conference, ACIIDS 2023, Phuket, Thailand, July 24–26, 2023, Proceedings (Communications in Computer and Information Science #1863)
Par Tzung-Pei Hong, Ngoc Thanh Nguyen, Hamido Fujita, Ali Selamat, Bogumiła Hnatkowska, Kitsuchart Pasupa, Siridech Boonsang. 2023
This book constitutes the second part of the proceedings of the 15th Asian Conference on Intelligent Information and Database Systems,…
ACIIDS 2023, held in Phuket, Thailand, during July 24–26, 2023.The 50 full papers included in this book were carefully reviewed and selected from 224 submissions. They were organized in topical sections as follows: Computer Vision, Cybersecurity and Fraud Detection, Data Analysis, Modeling, and Processing, Data Mining and Machine Learning, Forecasting and Optimization Techniques, Healthcare and Medical Applications, Speech and Text Processing.Intelligent Data Analytics, IoT, and Blockchain
Par Mansaf Alam, Bashir Alam. 2024
This book focuses on data analytics with machine learning using IoT and blockchain technology. Integrating these three fields by examining…
their interconnections, Intelligent Data Analytics, IoT, and Blockchain examines the opportunities and challenges of developing systems and applications exploiting these technologies. Written primarily for researchers who are working in this multi-disciplinary field, the book also benefits industry experts and technology executives who want to develop their organizations’ decision-making capabilities. Highlights of the book include: Using image processing with machine learning techniques A deep learning approach for facial recognition A scalable system architecture for smart cities based on cognitive IoT Source authentication of videos shared on social media Survey of blockchain in healthcare Accident prediction by vehicle tracking Big data analytics in disaster management Applicability, limitations, and opportunities of blockchain technology The book presents novel ideas and insights on different aspects of data analytics, blockchain technology, and IoT. It views these technologies as interdisciplinary fields concerning processes and systems that extract knowledge and insights from data. Focusing on recent advances, the book offers a variety of solutions to real-life challenges with an emphasis on security.