This document discusses using KinomaJS to run JavaScript on microcontrollers for IoT applications. It faces challenges of limited memory and lack of user interfaces on microcontrollers. KinomaJS addresses this by using dynamic loading of JavaScript and native modules to minimize memory usage. It also integrates mobile apps to provide user interfaces and allow over-the-air firmware updates from the app to the device. This approach makes it possible to implement security features like encryption in a memory-efficient way and easily update devices.
IRJET- Proof of Document using Multichain and EthereumIRJET Journal
This document proposes a proof of document system using Multichain and Ethereum blockchain technologies. It involves developing a frontend using HTML, CSS, JavaScript, and frameworks like Bootstrap and jQuery. Documents are uploaded and a unique hash is generated using SHA-256. The hash is stored on a private Multichain blockchain to prove the document's existence. An API is created using PHP frameworks like Slim to allow interaction with the blockchain. The system aims to provide a secure and verifiable way to prove ownership and existence of digital documents and records. Potential applications mentioned include securing medical, academic, and business records and agreements.
OpenDDR and Jakarta MVC - JavaLand 2021Werner Keil
We experience a growing number of mobile phones, tablets, phablets, foldables, smart TV, watches or home assistants and similar devices flooding the market almost every day. If you want to create a responsive web application with the best user experience you need dynamic adaptive content according to all relevant aspects of your device. That’s the reason for Device Description Repositories (DDR).
This session provides an overview of the W3C DDR standard for Mobile Device recognition and the OpenDDR project. Followed by a live demo of extensions to Spring MVC and the Jakarta MVC standard, plus .NET using C# and VB.NET leveraging the power of OpenDDR to simplify the development of cross device web applications. All offer automatic device detection based on OpenDDR, configuration of user preferences, automatically forward to the most appropriate view for a particular device or device type. As well as device aware templates, view engines and more.
HyperLedger Fabric is a blockchain framework that provides identity management, smart contracts (chaincode), privacy, and high transaction throughput. It uses a modular architecture consisting of peers, chaincode, ordering service, and certificate authority. Peers host the ledger and smart contracts, endorse and validate transactions. The ordering service orders transactions into blocks. Chaincode defines assets and transaction logic on the ledger. Channels provide isolation between different applications or groups of organizations.
The document describes Hyperledger, an open source blockchain fabric designed for business use. It was created to address limitations of existing blockchain technologies for business applications like scalability and lack of support for private transactions. The key elements of Hyperledger include smart contracts, digital assets, a decentralized consensus network, and cryptographic security. It also aims to meet requirements for industries like identity and auditability, private transactions, performance, and modular consensus models. Major use cases driving its design are business contracts, asset depositories, and supply chain management.
This document summarizes a presentation on developing blockchain applications using Hyperledger Fabric. It discusses key Hyperledger Fabric concepts like chaincode, which defines the business logic of a blockchain application. Chaincode is written in languages like Go and JavaScript. It also discusses the Hyperledger Fabric architecture, including components like peers, orderers, and how channels isolate ledgers in the network. The presentation provides examples of querying and updating state databases using chaincode. It demonstrates typical workflows for deploying chaincode to networks like Oracle Autonomous Blockchain Cloud Service.
Microservices Architectural Maturity Matrix, Token Based Authority, API Gatew...JoAnna Cheshire
The document discusses various architectural patterns for microservices, including:
1) Meshes of microservices distributed across network tiers for read-only IoT sensors.
2) Transactional microservices arranged in "Buckyball" meshes that both sense input and react to devices.
3) Integrated tubes of microservices connecting dimensions of big data globally with low latency.
Michael Koster from ARM presented during the Open Mobile Alliance LwM2M Workshop event on January 28, 2015. This is a copy of the slides presented for his session titled, "IPSO Alliance Objects".
JDD 2016 - Michał Balinski, Oleksandr Goldobin - Practical Non Blocking Micro...PROIDEA
We will show how to write application in Java 8 that do not waste resources and which can maximize effective utilization of CPU/RAM. There will be presented comparison of blocking and non-blocking approach for I/O and application services. Based on microservices implementing simple business logic in security/cryptography/payments domain, we will demonstrate following aspects: * NIO at all edges of application * popular libraries that support NIO * single instance scalability * performance metrics (incl. throughput and latency) * resources utilization * code readability with CompletableFuture * application maintenance and debugging All above based on our experiences gathered during development of software platforms at Oberthur Technologies R&D Poland.
IRJET- Proof of Document using Multichain and EthereumIRJET Journal
This document proposes a proof of document system using Multichain and Ethereum blockchain technologies. It involves developing a frontend using HTML, CSS, JavaScript, and frameworks like Bootstrap and jQuery. Documents are uploaded and a unique hash is generated using SHA-256. The hash is stored on a private Multichain blockchain to prove the document's existence. An API is created using PHP frameworks like Slim to allow interaction with the blockchain. The system aims to provide a secure and verifiable way to prove ownership and existence of digital documents and records. Potential applications mentioned include securing medical, academic, and business records and agreements.
OpenDDR and Jakarta MVC - JavaLand 2021Werner Keil
We experience a growing number of mobile phones, tablets, phablets, foldables, smart TV, watches or home assistants and similar devices flooding the market almost every day. If you want to create a responsive web application with the best user experience you need dynamic adaptive content according to all relevant aspects of your device. That’s the reason for Device Description Repositories (DDR).
This session provides an overview of the W3C DDR standard for Mobile Device recognition and the OpenDDR project. Followed by a live demo of extensions to Spring MVC and the Jakarta MVC standard, plus .NET using C# and VB.NET leveraging the power of OpenDDR to simplify the development of cross device web applications. All offer automatic device detection based on OpenDDR, configuration of user preferences, automatically forward to the most appropriate view for a particular device or device type. As well as device aware templates, view engines and more.
HyperLedger Fabric is a blockchain framework that provides identity management, smart contracts (chaincode), privacy, and high transaction throughput. It uses a modular architecture consisting of peers, chaincode, ordering service, and certificate authority. Peers host the ledger and smart contracts, endorse and validate transactions. The ordering service orders transactions into blocks. Chaincode defines assets and transaction logic on the ledger. Channels provide isolation between different applications or groups of organizations.
The document describes Hyperledger, an open source blockchain fabric designed for business use. It was created to address limitations of existing blockchain technologies for business applications like scalability and lack of support for private transactions. The key elements of Hyperledger include smart contracts, digital assets, a decentralized consensus network, and cryptographic security. It also aims to meet requirements for industries like identity and auditability, private transactions, performance, and modular consensus models. Major use cases driving its design are business contracts, asset depositories, and supply chain management.
This document summarizes a presentation on developing blockchain applications using Hyperledger Fabric. It discusses key Hyperledger Fabric concepts like chaincode, which defines the business logic of a blockchain application. Chaincode is written in languages like Go and JavaScript. It also discusses the Hyperledger Fabric architecture, including components like peers, orderers, and how channels isolate ledgers in the network. The presentation provides examples of querying and updating state databases using chaincode. It demonstrates typical workflows for deploying chaincode to networks like Oracle Autonomous Blockchain Cloud Service.
Microservices Architectural Maturity Matrix, Token Based Authority, API Gatew...JoAnna Cheshire
The document discusses various architectural patterns for microservices, including:
1) Meshes of microservices distributed across network tiers for read-only IoT sensors.
2) Transactional microservices arranged in "Buckyball" meshes that both sense input and react to devices.
3) Integrated tubes of microservices connecting dimensions of big data globally with low latency.
Michael Koster from ARM presented during the Open Mobile Alliance LwM2M Workshop event on January 28, 2015. This is a copy of the slides presented for his session titled, "IPSO Alliance Objects".
JDD 2016 - Michał Balinski, Oleksandr Goldobin - Practical Non Blocking Micro...PROIDEA
We will show how to write application in Java 8 that do not waste resources and which can maximize effective utilization of CPU/RAM. There will be presented comparison of blocking and non-blocking approach for I/O and application services. Based on microservices implementing simple business logic in security/cryptography/payments domain, we will demonstrate following aspects: * NIO at all edges of application * popular libraries that support NIO * single instance scalability * performance metrics (incl. throughput and latency) * resources utilization * code readability with CompletableFuture * application maintenance and debugging All above based on our experiences gathered during development of software platforms at Oberthur Technologies R&D Poland.
Allen Green provides his resume from 2015-2016. He has 21 years of experience in construction and 3 years working in event set up. He is currently pursuing degrees in construction management, graphic communications, and real estate at Western Nevada College. Green has 60 credits remaining to graduate. He provides references from Western Nevada College and notes he may be unavailable to contact between semesters as he will be busy with classes.
This document is a resume for Bassem Magdy George, an experienced senior accountant from Egypt. It summarizes his professional experience including roles as a senior accountant, receivables accountant, and mortgage supervisor. It also lists his education including a Mini MBA and CMA certification. Key skills mentioned are financial statement analysis, accounting software proficiency, and strong communication abilities.
Const.118 Class Project Revision 4.5.14Allen Green
The document provides an estimate for converting a two-car garage into a man cave, including materials and labor costs. It estimates the total project cost at $81,000, with $350,000 for materials and $56,250 for labor after change orders. Key costs include $18,716-$23,118 for building the garage structure, $2,500-$3,500 for permits, $5,000-$7,200 for electrical work, $2,000-$3,200 for heating and AC, $5,000 for drywall and taping, and $5,000 for the sound system. Labor is estimated at 408 hours for a total of $18,262.
The Essay for the Green Pal.LinkedIn website AreticleAllen Green
The document contains an essay and draft business plan for a startup called Green Pal's Scholarship. The essay discusses how the 2007 housing crisis led to foreclosures and job losses. The author aims to purchase abandoned homes, restore them, and provide ownership to families in need through monthly rent payments. The draft business plan outlines one-time startup costs totaling $45,532 and ongoing monthly expenses of $2,072 to fund the purchase and renovation of abandoned homes.
This document lists the distributors for Arthur's Food Company products across various cities in India. It includes 13 entries detailing the city, name of the local distributor, contact person, and their contact information. The distributors cover major cities such as New Delhi, Mumbai, Bangalore, Hyderabad, Kolkata, Pune, Chennai, and more. Arthur's Food Company thus has distribution networks established across India to sell their food products nationwide.
This document is a resume for Akram Mahmoud Samy El-Sobky. It summarizes his work experience from 2008-2015 as Sales & Marketing Director for a company distributing Chinese vehicles in Egypt. It also lists previous roles from 2006-2008 as Vice General Manager for another automotive company in Egypt and roles from 2001-2005 marketing various vehicle brands in Egypt. The resume provides details on responsibilities and achievements for each role.
This document outlines the construction of a garage conversion project in Moundhouse, Nevada. James Cameron's company, Man Cave Inc., is the contractor overseeing the $775,000 project. Subcontractors include NASH Electrics and Alan Hutchings Installations. The project involves upgrading the electrical, media, and plumbing systems of a 28'x40' garage to create an entertainment space. Three change orders were issued to enhance the electrical and audio-visual capabilities. Upon completion, the owner will receive a 1969 Dodge Charger and 1966 Batmobile as bonuses.
Brussels Data Science Meetup, April 23 2015: Data4Good POC: a Micro-Finance L...Frederik Durant
This document summarizes Frederik Durant's data science project to build a machine learning model to predict whether micro-loans on the Kiva lending platform will be fully funded. It provides details on Kiva's mission to connect lenders to borrowers in developing countries. It describes Durant's process of collecting and analyzing loan data to train a logistic regression model to predict funding outcomes. The model achieved 87.82% accuracy using features like loan amount, description topics, borrower gender, and partner reputation. Kiva provided positive feedback and may consider internal use of the model.
This document discusses normal bladder function measurements including a volume greater than 200 mL over 15 to 30 seconds, a maximum flow rate greater than 15 mL/sec, and a continuous single curve of flow as opposed to short spikes.
The document discusses the International Council of Nurses (ICN), its strategic goals and pillars. The ICN aims to enhance health globally by championing nurses, advocating for the profession, and influencing health policy. Its three pillars are professional practice, regulation, and socio-economic welfare. Some key strategies discussed are developing nursing leadership, addressing issues like migration and workplace violence, and influencing global health agendas. The ICN also supports nursing students and education through initiatives like its Girl-Child Education Fund.
Frederik's passion project at the Metis Data Science Bootcamp in NYC, Jan-April 2015. Frederik built an end-to-end loan funding predictor/classifier for micro-finance platform Kiva.org
My baby still appears jaundice at one monthChris Cheung
This document discusses the causes, clinical assessment, investigations, and management of persistent neonatal jaundice in babies over 2 weeks old. Key causes discussed include breast milk jaundice, infections like UTIs, and hemolytic anemias. Clinical assessment involves history, examination of vital signs and jaundice severity, and urine/stool examination. Investigations include blood tests to check bilirubin levels and identify underlying causes. Imaging like ultrasound and HIDA scans can identify conditions like biliary atresia. The document emphasizes the importance of early diagnosis and management of conditions like biliary atresia to improve prognosis.
Protecting location privacy in sensor networks against a global eavesdropperShakas Technologies
The document discusses techniques for providing location privacy in sensor networks against a global eavesdropper. It proposes four techniques - periodic collection, source simulation, sink simulation, and backbone flooding - to provide location privacy for monitored objects (source location privacy) and data sinks (sink location privacy). These techniques provide trade-offs between privacy, communication cost, and latency. Analysis and simulation demonstrate that the proposed techniques are efficient and effective for providing source and sink location privacy in sensor networks.
IRJET - Data Security in Cloud Computing using Homomorphic AlgorithamIRJET Journal
This document discusses using homomorphic encryption to securely store and process data in the cloud. It begins with an introduction to cloud computing and data security challenges. The proposed system would encrypt user data before transferring it to the cloud server using homomorphic encryption. This allows computations to be performed on the encrypted data without decrypting it first, protecting data privacy. The document reviews related work on authentication schemes and secure file storage using encryption. It presents the proposed system architecture and concludes that homomorphic encryption can help address cloud computing security issues by allowing operations on encrypted user data.
This document provides an overview of designing Internet of Things (IoT) systems. It begins with definitions and then describes the key components of an IoT architecture including devices, communication protocols, platforms, and programming languages. Example open source platforms are also discussed. The presentation aims to provide a general understanding of creating IoT prototypes and selecting suitable technologies. Security, analytics, cognitive capabilities and solutions templates are also reviewed at a high level. The overall goal is to help understand the big picture of designing IoT systems and connect concepts to daily work.
The document outlines 19 potential project titles for a Cisco summer internship in 2011. The projects cover a wide range of topics including network performance testing, automation, monitoring, management, and security tools.
This document provides an overview of event-driven architecture and distributed transactions with microservices. It discusses event-driven programming and what constitutes a distributed transaction when using microservices. It then covers some common solutions for distributed transactions like the 2PC and Saga patterns. The Saga pattern uses a choreography or orchestration approach and events to coordinate transactions across services. Message brokers like Kafka, RabbitMQ and Azure Event Hub are discussed for facilitating event-driven architectures. Vert.x and Spring WebFlux are presented as reactive frameworks that are non-blocking and scale well.
Node.js and the MEAN Stack Building Full-Stack Web Applications.pdflubnayasminsebl
Welcome To
Node.js and the MEAN Stack: Building Full-Stack Web Applications
Nowadays, picking the best web app development technology is difficult. Because there are so many programming languages, frameworks, and technologies available right now, it can be challenging for business owners and entrepreneurs to SEO Expate Bangladesh Ltd choose the best development tool. Maintaining project efficiency has now become crucial in the era of web app development. Your firm will incur more expenses as you delay doing the assignment. A ground-breaking technology with distinctive characteristics, Node.js for web development. It is regarded by developers as one of the most successful cross-platform JavaScript environments for building reliable and powerful REST APIs, mobile applications, and online applications.
Describe Node.js
Node.js is a standalone runtime environment, not just a library or framework. It is dependent on Chrome's V8, a JavaScript engine capable of NodeJs Web Development running application code independently of the operating system or type of browser. Node.js is regarded as a standalone application on any machine because of its independence.
Frameworks for web applications
Any Node.js web application will require the web application framework as one of its most crucial requirements. Although the HTTP module allows you to construct your own, it is strongly advised that you build on the shoulders of others who came before you and utilize their work. If you haven't already decided which is your favorite, there are SEO Expate Bangladesh Ltd several to chose from. Express has a higher developer share than all other frameworks combined, according to a report by Eran Hammer. Second place went to Hammer's own Hapi.js, while many other frameworks followed with smaller market shares. In this situation, Express is not only the most widely used but also provides you with the best possibility of being able to pick up most new codebases rapidly. Additionally.
Security
Although web security has always been important, recent breaches and problems have made it absolutely essential. Learn about the OWASP Top 10, a list of the most significant internet security issues that is periodically updated. You can use this list to find potential security gaps in your application and conduct an audit there. Find out how to give your web application secure authentication. Popular middleware called Passport is used to authenticate users using many types of schemes. Learn effective Node.js encryption techniques. The hashing method known as Bcrypt is also the name of a popular npm package for encryption. Despite the probability that your code is secure, there is always a chance that one of your dependencies.
The front end
Although writing Node.js code for the back end of a website makes up a big portion of the job description for a Node.js Web Developer, you will probably also need to work on the front end occasionally to design the user interface. The occasional mo
This document discusses a roadmap for learning Web 3.0 skills. It recommends first developing skills in Web 2.0 technologies like React and Next.js. It then suggests learning the fundamentals of blockchain, smart contracts using Solidity, and how to build decentralized applications that connect to the blockchain using tools like Web3.js and Ethers.js. Finally, it provides examples of blockchain projects someone could build to develop their skills.
Allen Green provides his resume from 2015-2016. He has 21 years of experience in construction and 3 years working in event set up. He is currently pursuing degrees in construction management, graphic communications, and real estate at Western Nevada College. Green has 60 credits remaining to graduate. He provides references from Western Nevada College and notes he may be unavailable to contact between semesters as he will be busy with classes.
This document is a resume for Bassem Magdy George, an experienced senior accountant from Egypt. It summarizes his professional experience including roles as a senior accountant, receivables accountant, and mortgage supervisor. It also lists his education including a Mini MBA and CMA certification. Key skills mentioned are financial statement analysis, accounting software proficiency, and strong communication abilities.
Const.118 Class Project Revision 4.5.14Allen Green
The document provides an estimate for converting a two-car garage into a man cave, including materials and labor costs. It estimates the total project cost at $81,000, with $350,000 for materials and $56,250 for labor after change orders. Key costs include $18,716-$23,118 for building the garage structure, $2,500-$3,500 for permits, $5,000-$7,200 for electrical work, $2,000-$3,200 for heating and AC, $5,000 for drywall and taping, and $5,000 for the sound system. Labor is estimated at 408 hours for a total of $18,262.
The Essay for the Green Pal.LinkedIn website AreticleAllen Green
The document contains an essay and draft business plan for a startup called Green Pal's Scholarship. The essay discusses how the 2007 housing crisis led to foreclosures and job losses. The author aims to purchase abandoned homes, restore them, and provide ownership to families in need through monthly rent payments. The draft business plan outlines one-time startup costs totaling $45,532 and ongoing monthly expenses of $2,072 to fund the purchase and renovation of abandoned homes.
This document lists the distributors for Arthur's Food Company products across various cities in India. It includes 13 entries detailing the city, name of the local distributor, contact person, and their contact information. The distributors cover major cities such as New Delhi, Mumbai, Bangalore, Hyderabad, Kolkata, Pune, Chennai, and more. Arthur's Food Company thus has distribution networks established across India to sell their food products nationwide.
This document is a resume for Akram Mahmoud Samy El-Sobky. It summarizes his work experience from 2008-2015 as Sales & Marketing Director for a company distributing Chinese vehicles in Egypt. It also lists previous roles from 2006-2008 as Vice General Manager for another automotive company in Egypt and roles from 2001-2005 marketing various vehicle brands in Egypt. The resume provides details on responsibilities and achievements for each role.
This document outlines the construction of a garage conversion project in Moundhouse, Nevada. James Cameron's company, Man Cave Inc., is the contractor overseeing the $775,000 project. Subcontractors include NASH Electrics and Alan Hutchings Installations. The project involves upgrading the electrical, media, and plumbing systems of a 28'x40' garage to create an entertainment space. Three change orders were issued to enhance the electrical and audio-visual capabilities. Upon completion, the owner will receive a 1969 Dodge Charger and 1966 Batmobile as bonuses.
Brussels Data Science Meetup, April 23 2015: Data4Good POC: a Micro-Finance L...Frederik Durant
This document summarizes Frederik Durant's data science project to build a machine learning model to predict whether micro-loans on the Kiva lending platform will be fully funded. It provides details on Kiva's mission to connect lenders to borrowers in developing countries. It describes Durant's process of collecting and analyzing loan data to train a logistic regression model to predict funding outcomes. The model achieved 87.82% accuracy using features like loan amount, description topics, borrower gender, and partner reputation. Kiva provided positive feedback and may consider internal use of the model.
This document discusses normal bladder function measurements including a volume greater than 200 mL over 15 to 30 seconds, a maximum flow rate greater than 15 mL/sec, and a continuous single curve of flow as opposed to short spikes.
The document discusses the International Council of Nurses (ICN), its strategic goals and pillars. The ICN aims to enhance health globally by championing nurses, advocating for the profession, and influencing health policy. Its three pillars are professional practice, regulation, and socio-economic welfare. Some key strategies discussed are developing nursing leadership, addressing issues like migration and workplace violence, and influencing global health agendas. The ICN also supports nursing students and education through initiatives like its Girl-Child Education Fund.
Frederik's passion project at the Metis Data Science Bootcamp in NYC, Jan-April 2015. Frederik built an end-to-end loan funding predictor/classifier for micro-finance platform Kiva.org
My baby still appears jaundice at one monthChris Cheung
This document discusses the causes, clinical assessment, investigations, and management of persistent neonatal jaundice in babies over 2 weeks old. Key causes discussed include breast milk jaundice, infections like UTIs, and hemolytic anemias. Clinical assessment involves history, examination of vital signs and jaundice severity, and urine/stool examination. Investigations include blood tests to check bilirubin levels and identify underlying causes. Imaging like ultrasound and HIDA scans can identify conditions like biliary atresia. The document emphasizes the importance of early diagnosis and management of conditions like biliary atresia to improve prognosis.
Protecting location privacy in sensor networks against a global eavesdropperShakas Technologies
The document discusses techniques for providing location privacy in sensor networks against a global eavesdropper. It proposes four techniques - periodic collection, source simulation, sink simulation, and backbone flooding - to provide location privacy for monitored objects (source location privacy) and data sinks (sink location privacy). These techniques provide trade-offs between privacy, communication cost, and latency. Analysis and simulation demonstrate that the proposed techniques are efficient and effective for providing source and sink location privacy in sensor networks.
IRJET - Data Security in Cloud Computing using Homomorphic AlgorithamIRJET Journal
This document discusses using homomorphic encryption to securely store and process data in the cloud. It begins with an introduction to cloud computing and data security challenges. The proposed system would encrypt user data before transferring it to the cloud server using homomorphic encryption. This allows computations to be performed on the encrypted data without decrypting it first, protecting data privacy. The document reviews related work on authentication schemes and secure file storage using encryption. It presents the proposed system architecture and concludes that homomorphic encryption can help address cloud computing security issues by allowing operations on encrypted user data.
This document provides an overview of designing Internet of Things (IoT) systems. It begins with definitions and then describes the key components of an IoT architecture including devices, communication protocols, platforms, and programming languages. Example open source platforms are also discussed. The presentation aims to provide a general understanding of creating IoT prototypes and selecting suitable technologies. Security, analytics, cognitive capabilities and solutions templates are also reviewed at a high level. The overall goal is to help understand the big picture of designing IoT systems and connect concepts to daily work.
The document outlines 19 potential project titles for a Cisco summer internship in 2011. The projects cover a wide range of topics including network performance testing, automation, monitoring, management, and security tools.
This document provides an overview of event-driven architecture and distributed transactions with microservices. It discusses event-driven programming and what constitutes a distributed transaction when using microservices. It then covers some common solutions for distributed transactions like the 2PC and Saga patterns. The Saga pattern uses a choreography or orchestration approach and events to coordinate transactions across services. Message brokers like Kafka, RabbitMQ and Azure Event Hub are discussed for facilitating event-driven architectures. Vert.x and Spring WebFlux are presented as reactive frameworks that are non-blocking and scale well.
Node.js and the MEAN Stack Building Full-Stack Web Applications.pdflubnayasminsebl
Welcome To
Node.js and the MEAN Stack: Building Full-Stack Web Applications
Nowadays, picking the best web app development technology is difficult. Because there are so many programming languages, frameworks, and technologies available right now, it can be challenging for business owners and entrepreneurs to SEO Expate Bangladesh Ltd choose the best development tool. Maintaining project efficiency has now become crucial in the era of web app development. Your firm will incur more expenses as you delay doing the assignment. A ground-breaking technology with distinctive characteristics, Node.js for web development. It is regarded by developers as one of the most successful cross-platform JavaScript environments for building reliable and powerful REST APIs, mobile applications, and online applications.
Describe Node.js
Node.js is a standalone runtime environment, not just a library or framework. It is dependent on Chrome's V8, a JavaScript engine capable of NodeJs Web Development running application code independently of the operating system or type of browser. Node.js is regarded as a standalone application on any machine because of its independence.
Frameworks for web applications
Any Node.js web application will require the web application framework as one of its most crucial requirements. Although the HTTP module allows you to construct your own, it is strongly advised that you build on the shoulders of others who came before you and utilize their work. If you haven't already decided which is your favorite, there are SEO Expate Bangladesh Ltd several to chose from. Express has a higher developer share than all other frameworks combined, according to a report by Eran Hammer. Second place went to Hammer's own Hapi.js, while many other frameworks followed with smaller market shares. In this situation, Express is not only the most widely used but also provides you with the best possibility of being able to pick up most new codebases rapidly. Additionally.
Security
Although web security has always been important, recent breaches and problems have made it absolutely essential. Learn about the OWASP Top 10, a list of the most significant internet security issues that is periodically updated. You can use this list to find potential security gaps in your application and conduct an audit there. Find out how to give your web application secure authentication. Popular middleware called Passport is used to authenticate users using many types of schemes. Learn effective Node.js encryption techniques. The hashing method known as Bcrypt is also the name of a popular npm package for encryption. Despite the probability that your code is secure, there is always a chance that one of your dependencies.
The front end
Although writing Node.js code for the back end of a website makes up a big portion of the job description for a Node.js Web Developer, you will probably also need to work on the front end occasionally to design the user interface. The occasional mo
This document discusses a roadmap for learning Web 3.0 skills. It recommends first developing skills in Web 2.0 technologies like React and Next.js. It then suggests learning the fundamentals of blockchain, smart contracts using Solidity, and how to build decentralized applications that connect to the blockchain using tools like Web3.js and Ethers.js. Finally, it provides examples of blockchain projects someone could build to develop their skills.
This document discusses how to download and play the mobile game Subway Surfers on a personal computer. It describes using BlueStacks, an Android emulator, to install and run the game normally played on phones and tablets. BlueStacks allows users to access Google Play to download Subway Surfers and other Android apps. Once installed through BlueStacks, the game can be played offline on a PC like a mobile game, allowing users to enjoy Subway Surfers on a larger screen without being limited to a phone.
HTML5 is becoming the preferred technology for automotive HMI systems due to its rich set of features that allow for the creation of robust applications. Key features include local storage options like Web Storage and IndexedDB for offline use, multimedia support through <audio> and <video> tags, device access APIs, and rendering controls like <canvas> that enable precise graphics. The emergence of HTML5 has also influenced development practices, with more use of patterns like MVC to separate application logic from presentation.
Magiclock: Scalable Detection of Potential Deadlocks in Large-Scale Multithre...KaashivInfoTech Company
The document presents Magiclock, a technique for detecting potential deadlocks in large multithreaded programs. Magiclock analyzes execution traces without any actual deadlocks occurring. It iteratively eliminates unnecessary lock dependencies and partitions lock dependencies by thread to efficiently detect potential deadlock chains without examining duplicate permutations. The experimental results showed Magiclock is more scalable and efficient than existing dynamic detectors.
IRJET- Development of Uncrackable SoftwareIRJET Journal
This document discusses challenges with developing uncrackable software and proposes potential solutions. It describes how software cracking works by modifying programs to gain unauthorized access. Existing approaches like virtual machines and encryption are analyzed, but have limitations. Virtual machines reduce performance and encryption approaches can still be broken by analyzing the decryption process and keys used. The document concludes that truly uncrackable software would need to avoid decrypting encrypted codes on the user's device, to prevent the user from accessing decryption keys and algorithms.
Beyond the RTOS: A Better Way to Design Real-Time Embedded SoftwareMiro Samek
Embedded software developers from different industries are independently re-discovering patterns for building concurrent software that is safer, more responsive and easier to understand than naked threads of a Real-Time Operating System (RTOS). These best practices universally favor event-driven, asynchronous, non-blocking, encapsulated active objects with state machines instead of naked, blocking RTOS threads. This presentation explains the concepts related to this increasingly popular "reactive approach", and specifically how they apply to real-time embedded systems.
The document discusses various building blocks for Internet of Things (IoT) systems, including nodes, operating systems, networks, middleware and platforms. It outlines that initial IoT systems will likely be built from the bottom up using device nodes. It also notes that node operating systems and middleware are becoming more available. Ultimately, IoT platforms aim to make developing, deploying and managing large-scale IoT systems easier by providing interoperability across different systems through standards. The document provides examples and diagrams related to each building block.
A Scalable Network Monitoring and Bandwidth Throttling System for Cloud Compu...Nico Huysamen
This document summarizes a scalable network monitoring and bandwidth throttling system for cloud computing. The system monitors network usage of users on a cloud to identify those abusing bandwidth. It uses a client-server model where virtual machines run client software to monitor their own traffic and report to servers monitoring each cluster. When bandwidth thresholds are exceeded, servers calculate new bandwidth limits for abusive users to normalize network usage across the cloud. The system was tested on Amazon EC2 using over a million simulated clients to evaluate its scalability.
All-inclusive insights on Building JavaScript microservices with Node!.pdf
KinomaJS on Microcontroller
1. KinomaJS on Micro-controller
Introduction
Running JavaScript on micro controllers is challenging mainly because of the memory restric-
tion. Those who have written an interpreter can easily imagine how much heap memory will be
necessary and how big the interpreter can be. For micro controllers, we cannot assume that the
operating system supports virtual memory or even a dynamic loading mechanism. In fact, the
memory management system coming with RTOS is nothing but a simple malloc function. The
system, drivers, middleware and all applications share only one heap space. It is easy to imag-
ine that the memory fragmentation will be a big concern — if someone allocates a long-lived
memory block somewhere (even if it is tiny), the heap memory can be easily fragmented and
quickly becoming useless. Not only the heap memory but the footprint size is also a concern --
all objects, including the operating system, network stack, SDKs, and applications, need to be
linked into into one executable on operating systems like RTOS. Overlay can be possible but
this is for switching the personality of applications. It is not useful for implementing something
like a JavaScript engine which has to be kept in memory all the time.
Besides the resource limitation, we cannot assume that micro controllers have user interface
devices like a display and keyboard, let alone a fancy touch screen, either. This makes it difficult
even to configure the device to join a WiFi network. Many network routers, for example, run a
HTTP server so that users can configure the device using a Web browser. IoT devices can do
the same but what we can do with a Web browser is very limited. For example, just in order to
update software on a device (sometimes it is called firmware update), users need to download a
software update from a server themselves and upload it to the device by hand. Our mobile app
solution make it easy and secure, which is powered also by KinomaJS.
Our KinomaJS powered IoT devices are designed to work out of the box — no cross compilers
or a SDK is necessary. All you need is Kinoma Studio. You write the code for both micro con-
trollers and mobile apps in JavaScript on the same tool. Once you finish debugging the code,
your device code can be installed directly to the device using Kinoma Studio or saved in the
mobile app as a resource so that it is uploaded to the device when users launch the mobile app.
This way, the firmware update can be done with the software update of the mobile app. The lat-
est Javascript byte code is installed into the mobile app and delivered to the users’ mobile de-
vices. When the mobile app is launched, the latest firmware will be sent out to the device.
IoT security is becoming a big issue. As above, IoT devices tend to lack fundamental security
features, like memory protection, access control, secure vault and cryptographic functions which
tend to take up a lot of memory. Without those functions supported by the system, even a sim-
ple sandboxing will be difficult to be implemented. Using JavaScript has an advantage on this
front. Unlike C, JavaScript cannot access random memory and only APIs that are safe to use
are opened for user applications. As long as carefully avoiding the use of global variables, your
instance variables cannot be accessed or altered by other applications. As for the network secu-
rity, supporting even SSL is not easy for the IoT device because of the limited resource. We will
see how we have overcome this issue in detail taking SSL for example.
1
2. On-demand JavaScript Loader
In this section, we will look at how the dynamic loading system works with JavaScript. The “re-
quire” directive was introduced and have been used to include non-standard libraries. We ex-
tended this function to load not only JavaScript code but native code bound to the JavaScript
code as well. KinomaJS supports a mechanism to extend JavaScript functions with native code.
This is useful for writing CPU intensive processes, like cryptographic functions and handling bi-
nary data. In fact, our cryptographic library, big number processor, and some device drivers like
I2C and GPIO are implemented in C and exposed as a JavaScript object and functions. Those
modules are loaded with “require” only when it is necessary. This way, the main executable
does not have to include those additional functions. Its footprint can be much smaller and the
saved memory can be used for loading a module and reused for another module. Basically the
standard JavaScript objects, like RegExp, Math, Date, etc. are implemented in the same way so
we put some standard objects to extensions as well to keep the footprint small. Those loaded
extensions will be unloaded automatically when the object is garbage-collected by the Java-
Script engine. The garbage collector is kicked in only when memory is scarce, therefore loaded
modules will stay there as long as memory is available and will not be re-loaded even when it is
“required” again. It is safe to say this memory-speed trade-off is fair. The effort to make code
smaller will be paid off.
Let’s see how this mechanism save the memory usage in detail, taking a simple HTTPS opera-
tion for example. The following graph represents the memory usage during the SSL operations
with HTTP. When a client and a server establish a TCP connection, SSL starts the handshake
process to authenticate and exchange a session key. If everything goes well, it sits between the
upper level protocol i.e., HTTP and the socket layer. All data sent through the SSL layer will be
encrypted.
On the graph, when an application starts HTTPS, only necessary modules are loaded, and as
the process goes through, other modules like cryptographic functions, will be loaded on-de-
mand.
2
3. SSL starts the handshake process with exchanging the “hello” message between the server and
client. During these protocols, both parties negotiate the cipher suite which designate a public
key algorithm, symmetric algorithm, and hash algorithm. Note that at this point, none of those
algorithms is loaded as the graph shows. Cryptographic functions will be loaded only when it is
needed in the later process. When the negotiation is done and the server has sent out its certifi-
cate, the client generates a temporary key and sends it encrypting with the server’s public key.
This process involves hashing with MD5 and SHA1 to generate the master secret, and encrypt-
ing the temporary key with a public key algorithm. As the graph shows, this process takes up the
memory most as many Cryptographic modules are loaded, which includes the public key algo-
rithm that can be big. Once this process is done, the public key algorithm is no longer needed.
In fact, in the next protocol, which is called “change cipher” that is the trigger to start encrypting
data, all those algorithms are unloaded and the memory is freed, as the symmetric key algo-
rithm and the digest algorithm are swapped in. Finally, both parties share a session key, and
prepare for encrypting / decrypting data. Those symmetric and hash algorithms will stay until the
session is closed.
Here is a code snippet of the actual SSL implementation in JavaScript.
3
0
35
70
105
140
hello
cert
hello
done
change
cipher
finished
data
heap xs
4. switch
(cipher.cipherAlgorithm)
{
case
FskSSL.cipherSuite.DES:
var
enc
=
new
Crypt.DES(o.key);
break;
case
FskSSL.cipherSuite.TDES:
var
enc
=
new
Crypt.TDES(o.key);
break;
case
FskSSL.cipherSuite.AES:
var
enc
=
new
Crypt.AES(o.key);
break;
case
FskSSL.cipherSuite.RC4:
var
enc
=
new
Crypt.RC4(o.key);
break;
…
The code is selecting a symmetric algorithm in the “change cipher” process. The Crypt object
looks like this:
<object
name="Crypt">
<function
name="get
AES">
return
require("Crypt_AES");
</function>
<function
name="get
TDES">
return
require("Crypt_TDES");
</function>
…
</object>
This way, only the selected algorithm is loaded into the memory while you can support as many
algorithms as you want without a concern of the memory limitation.
Mobile App
As having looked at how JavaScript code is loaded, it is easy to write a loadable code in Kino-
maJS. It is natural to incorporate such code into a mobile app. Mobile devices have rich user
interface. The loadable code can be seen as a part of the whole application. Only difference is
the interface between the UI part and the device code — it may sound a little like RPC. In this
case, the micro controller will be a server. The protocol is arbitrary, depending on the applica-
tion. KinomaJS on micro controller supports HTTP and WebSocket at the moment. As for the
discovery service, SSDP and mDNS are supported.
A typical application using micro controller is control and monitor censors. A standalone device
will have a set of APIs to interface with the censor. In our mobile solution, we will run the UI on
the mobile platform and the censor processing on the micro controller.
4
UI
sensor IO
UI
sensor IO
networkfunction call
5. Here is a code snippet of the UI part. The sensor data retrieved via an API or sent from the con-
troller via WebSocket is stored in an instance variable for later use. onTimeChanged is called
periodically to update the screen.
<behavior><![CDATA[
function
onTimeChanged(canvas)
{
//
draw
objects
at
this.axes
on
canvas
}
function
onAxesChanged(canvas,
axes)
{
this.axes
=
axes;
}
]]></behavior>
The following code is a part of the standalone version of the mobile app. This will poll the axis
data from a censor periodically and distributes the data to the above callback.
<handler
path="/gotAxes">
<behavior><![CDATA[
<method
id="onInvoke"
params="content,
message"><![CDATA[
var
data
=
message.requestObject;
if(
data
!=
null
)
application.distribute(
"onAxesChanged",
data
);
</method>
]]></behavior>
application.invoke(
new
MessageWithObject("pins:configure",
{
adxl345:
{
require:
"ADXL345",
pins:
{
adxl:
{
sda:
27,
clock:
29
}
}
}
}));
application.invoke(
new
MessageWithObject(
"pins:/adxl345/read?repeat=on&callback=/gotAxes&interval="
+
params.polling
));
This code is a part of the distributed version of the mobile app. It is corresponding to the above
code — when a WebSocket connection is established, it starts the polling on the controller. The
controller will sends back data periodically and the receiver distributes the data one by one to
the UI part.
<behavior><![CDATA[
function
connect(hostname)
{
this.ws
=
new
WebSocket("ws:"+
hostname);
this.ws.onconnect
=
function()
{
this.send(
“polling”
);
};
this.ws.onmessage
=
function(ev)
{
var
result
=
JSON.parse(ev.data);
application.distribute(
"onAxesChanged",
result);
};
}
]]></behavior>
5
6. Security
Sandboxing is easy with Javascript and beyond that, dynamic loading and collaboration with
mobile app make the whole system more secure. Taking SSL for example again, there are more
than 30 options for algorithms and if all of them are implemented in the ordinary way, the code
of those algorithms will take up so much memory. A research reports that “70 percent [of IoT1
devices] did not encrypt communications to the Internet and local network.” The report does not
point out the reason clearly but it must be related to the lack of resources of the IoT device. With
KinoamaJS, all cryptographic algorithms can be implemented as loadable and only when it be-
comes necessary it is loaded on the memory. This way, necessary security measures can be
practically executed while applications are given enough memory.
Needless to say, security update is inevitable. A security researcher, Bruce Schneier warns2
about the (in)ability of software update on micro controllers. The mobile app solution makes it
easy and can keep the device code updated. When a user launch the mobile app, if it has an
update it will be automatically sent out to the device and the renewed module will be used right
away.
Another example is "personalization" of the device. Personalization is a process to make your
device different than others. More specifically, the process usually involves installing a unique ID
and individual keys. This is necessary in a case like the device connects a cloud service. The
cloud service needs to know who is connecting to the service and make sure it is an authorized
party. To do that, usually the client needs to keep its own private key or an unique password.
But, it is not practical to burn those keys or password into a storage or NVRAM at the manufac-
turing time as we do not know what kind of service users want to use with the device. Extra cost
to personalize cannot be ignored either. Our mobile solution can make it easy as well, like the
following scenario that is to install a key pair to the device:
1. Log in to a service with a user ID / password on a mobile phone,
2. Once the service authorizes the user, it sends back a key pair for the device owned by the
user,
3. Then the mobile device passes the key to the IoT device. Now the device can connect the
cloud service using the key standalone and can send / receive data securely.
Theoretically it is possible to do a similar process using web but letting users handle a sensitive
data like keys can lead the whole system to a failure. Once again, the mobile code and device
code can be written together on Kinoma Studio. Not only when a new software is being devel-
oped but when it is updated, it is easy to make sure the server and client process the same pro-
tocol. The following example shows how the key can be installed from the mobile to the device
using HTTP. A code snippet of a HTTP service on the device will look like:
var
HTTPServer
=
require(“HTTPServer”);
this.httpServer
=
new
HTTPServer(port);
this.httpServer.onRequest
=
function(http)
{
var
o
=
http.decomposeUrl(http.url);
if
(o.path.length
<
1)
return;
switch
(o.path[0])
{
http://h20195.www2.hp.com/V2/GetDocument.aspx?docname=4AA5-4759ENW&cc=us&lc=en1
https://www.schneier.com/essays/archives/2014/01/the_internet_of_thin.html2
6
7. case
"install":
env.set(“key”,
http.content);
//
save
the
key
on
the
secure
storage
for
later
use
break;
…
}
On the client side, i.e., on the mobile device, KPR supports the device discovery service by de-
fault, and once the device is discovered, it can simply send the key data via HTTP:
var
message
=
new
Message(“https://“
+
hostname
+
“/install”);
message.requestChunk
=
Files.readChunk(“keyFile”);
message.method
=
"POST";
application.invoke(message,
Message.TEXT);
You can extend the protocol this way yourself. It has to be consistent between the server and
client, but it will be easy to do with KinomaJS on Kinoma Studio.
7