Blockchain
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This presentation introduces blockchain technology. It provides an overview of blockchain and its history, how blockchain works through block structure and chain connections on a peer-to-peer network, technologies that power blockchain like decentralization and cryptography, applications of blockchain in areas like cryptocurrency, smart contracts, healthcare and supply chain, and advantages like transparency and security as well as disadvantages like complexity and human error. The presentation is delivered by a group with members Mariea Akter, Amit Kundu, Md. Zahid Hasan, and Khairul Alam Ovy.
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Blockchain technology allows transactions to be grouped into blocks and recorded in a ledger. Each block is cryptographically linked, making the record permanent and unalterable. This permits untrusting parties to co-create a shared record without relying on a central authority. Blockchains use cryptographic keys, peer-to-peer networks, and a shared ledger to securely transmit unique instances of value in a transparent manner that can be accessed by various servers. There are four basic types of blockchain: private, public, federated, and hybrid. Blockchain provides advantages like improved accuracy, reduced costs, decentralization, transparency, and security of transactions. However, it also faces challenges like needing high-performance and not replacing certain solutions like databases
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Blockchain technology was first introduced with the Hashcash algorithm in 1997 and later developed by Satoshi Nakamoto in 2008 to power bitcoin transactions via a consensus algorithm. It consists of blocks of information linked through cryptography to form a distributed ledger managed by a peer-to-peer network, allowing information to be recorded immutably. Participants approve transactions and add verified blocks to the chain through a consensus process. It provides high security, transparency, and accessibility without a central authority through cryptographic linking of chronological blocks.
How does blockchain work
This document provides an overview of blockchain technology, how it works, and its applications. It defines blockchain as a decentralized digital ledger consisting of blocks that record transactions across networks so past transactions cannot be altered. The document outlines the history of blockchain, how it provides security through hashing and proof-of-work algorithms, and how cryptocurrencies use blockchain to be immune from counterfeiting without central authorities. It then provides an example of how a basic bitcoin transaction occurs between parties on the blockchain network.
blockchain PPT.pptx
A blockchain is a constantly growing ledger which keeps a permanent record of all the transactions that have taken place in a secure, chronological, and immutable way. Ledger: It is a file that is constantly growing. Permanent: It means once the transaction goes inside a blockchain, you can put up it permanently in the ledger.
The advancements of Blockchain are still young and have the potential to be revolutionary in the future; so, let’s begin demystifying this technology. Blockchain is a combination of three leading technologies: A means of computing, to store the transactions and records of the network
BlockChain Technology - Technology Behind Bitcoin and other Cryptocurrency
Blockchain technology is a digital innovation that can significantly impact financial markets in the next few years. It allows for trustworthy and secure transactions through a distributed ledger maintained across a peer-to-peer network. A blockchain uses cryptography to record transactions in blocks that are chained together, making past records unalterable. While still developing, blockchain offers opportunities for trust and security across industries through features like smart contracts and distributed data storage. It remains to be seen how widely blockchain will be adopted and what applications may emerge in the future.
BLOCKCHAIN.pptx
Blockchain technology is a distributed database or digital ledger that records transactions in a verifiable way without the need for a central authority. It works by sharing a constantly growing list of records called blocks that are linked together using cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data. This design makes blockchains resistant to modification, ensuring data integrity. The document discusses the history and fundamentals of blockchain technology, how it works, applications like cryptocurrencies and smart contracts, and advantages like decentralization, security, and cost reduction as well as disadvantages like scalability issues.
Blockchain and Its Applications in the Real World
This document discusses the applications of blockchain technology in various real-world sectors. It begins by providing background on blockchain and describing its architecture including block headers, timestamps, hashes, and Merkle roots. It then examines some key applications of blockchain including cryptocurrency and finance, healthcare, and e-governance. In finance, blockchain enables secure and transparent transactions. In healthcare, it allows for secure sharing of electronic health records. In e-governance, blockchain can provide transparent voting systems and secure digital identities. The document explores how blockchain improves areas like supply chain management, property rights, and decentralized finance through increased transparency, security, and integrity of data and transactions.
BDM Meetup #1 - Blockchains for Developers - Part 01
I shared a little about me and what Neuroware does whilst also providing a little context as to why we have blockchains and why it is we started the Blockchain Developers Malaysia group
Bit coin basics 101
This slide contains of a basic introduction about Bitcoin and Blockchain technology covering topics on; what is Bitcoin, how Bitcoin works, who created bitcoin, what is blockchain technology, uses and benefits of blockchain.
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The Importance of Blockchains in the Modern Industry.pdf
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Paradigm shift: from the bitcoin Blockchain to Networked Computing
Paradigm shift: from the bitcoin Blockchain to Networked Computing
BlockChain Technology - Technology Behind Bitcoin and other Cryptocurrency
BlockChain Technology - Technology Behind Bitcoin and other Cryptocurrency
BDM Meetup #1 - Blockchains for Developers - Part 01
BDM Meetup #1 - Blockchains for Developers - Part 01
More from Amit Kundu
Smart Home Automation And security System
This document discusses using internet of things (IOT) for home automation and security systems. It describes using voice commands, remote control, motion sensors, and other components like Arduino, Bluetooth, and sensors to control lighting, air conditioning, appliances. Potential limitations are discussed like unreliable sonar sensors or needing an internet connection. Future work focuses on upgrading components and simplifying the setup process.
Cache Memory
Cache memory is a type of memory that stores frequently accessed data closer to the processor for low latency access. There are different types of caches including local, replicated, distributed, remote, and near caches.
Direct mapping is a technique that maps each block of main memory to only one cache line. For a 64KB cache with 4 byte blocks and 16MB of main memory addressed with 24 bits, the address is split into a 2-bit word identifier, 8-bit tag, and 14-bit slot.
There are two policies for writing to cache - write-through always writes to both cache and main memory, while write-back only writes to cache and defers writing to main memory until the block is replaced
Automated Tools For System Analysis and Design
This document discusses automated tools for system analysis and design (CASE). It contains the following key points:
1. CASE tools are used to support and automate activities throughout the system development lifecycle to increase productivity and quality.
2. CASE tools can improve quality, speed, testing, documentation and project management of systems being developed. However, widespread adoption has been slower than expected due to costs, return on investment timelines, and functionality bottlenecks.
3. The document outlines categories of CASE products and tools, including diagramming tools, form/report generators, analysis tools, repositories, documentation generators, and code generators to support the system development process.
Android Operating System
The document provides information about Android, including:
- A brief history of Android starting as a modified version of Linux and being purchased by Google.
- An overview of Android features such as automatic Wi-Fi turning on and battery saving restrictions.
- Details on Android architecture including its Linux kernel, libraries, runtime environment, and applications layer.
- Lists versions of Android from 1.0 to the current 8.0 (Oreo).
- Highlights advantages like a large user base and app selection, and disadvantages like potential for advertisements and worse battery life.
Database project IDEA
This document outlines a proposed cafeteria management software created by a team of 4 students. It discusses problems currently faced by cafeteria owners, managers, customers and suppliers. The objectives of the software are to create a secure system with a clean UI to track orders, inventory, expenses and sales. The proposed approach includes building a basic UI with JavaFX, an integrated online database, and a versatile, modifiable software. The expected outcomes are improved tracking of products and customers, reduced staff needs, increased efficiency and record of financial growth. The document concludes by acknowledging potential obstacles but emphasizing benefits like experience, profit and inspiration for others.
Ipv4 & ipv6
The document discusses IP addresses and the differences between IPv4 and IPv6. It defines what an IP address is, its uses, and the classes and addressing in IPv4. It describes problems with IPv4 like limited address space. It then defines IPv6 addressing which uses 128-bit addresses written in hexadecimal, and types of IPv6 addresses. It lists advantages of IPv6 like larger address space and built-in security. Tables compare features of IPv4 and IPv6 like address space, header fields, and representation.
Unguided Media
This document discusses different types of unguided media used for wireless communication, including radio waves, microwaves, and infrared waves. It provides information on the electromagnetic spectrum ranges, propagation modes, antenna types, common usages, advantages, disadvantages, and dangers of each type of unguided media. Presenters and their member IDs are listed at the beginning.
Innovative Business Idea
This document outlines a business idea proposed by a group of six individuals to establish an IT firm in Bangladesh. The group provides details on their market research, which found opportunities in IT outsourcing and freelancing in Bangladesh. They propose a business model of completing local and government projects while also working on popular freelancing platforms. Cost estimates ranging from BDT 528,000 to 908,000 are provided for starting the business along with a 30 to 60 day timeline. A SWOT analysis identifies strengths in low costs and skills while noting weaknesses in innovation and internet speeds. Opportunities in market demand and few competitors are balanced with threats from lower cost imports and new entrants. The group believes the business could create jobs, inspire others
Intel core i7
The document provides information about the Intel Core i7 processor. It includes sections about the history, architecture, features, advantages, and disadvantages. Some key details are:
- The Intel Core i7 is a desktop CPU with 4 cores and 8 threads that can reach speeds up to 4.2GHz. It supports up to 64GB of RAM.
- Features include Turbo Boost, Hyper-Threading, integrated graphics, and virtualization technologies.
- Advantages are its performance capabilities due to technologies like virtualization and Turbo Boost. Disadvantages include higher price and power consumption compared to other processors.
DFS algorithm
The document discusses depth-first search (DFS) algorithms. It provides pseudocode for performing DFS on a graph and walks through an example of running DFS on a sample graph. It explains that DFS classifies edges in the original graph as tree edges, back edges, forward edges, or cross edges based on how vertices are encountered during the algorithm's execution.
Laplace transform
The document presents information about Laplace transforms including:
- The definition and properties of the Laplace transform. It transforms differential equations into algebraic equations.
- Examples of applications in solving ordinary and partial differential equations, electrical circuits, and other fields.
- Limitations in that it can only be used to solve differential equations with known constants.
- Conclusion that the Laplace transform is a powerful mathematical tool used across many areas of science and engineering.
Presentation on Rectifier
A rectifier converts alternating current (AC) to direct current (DC) by only allowing current to flow in one direction. The presentation discusses half wave rectifiers, which use one diode and pass current during either the positive or negative half of the AC cycle. It also covers full wave rectifiers like the center tap and bridge rectifier, which use two or more diodes to pass current during both halves of the AC cycle, thereby doubling the output current compared to a half wave rectifier.
Presentation on Heap Sort
Heap data structures can be used for sorting and memory management. Heapsort uses a max heap to sort an array by repeatedly replacing the root with the last element and heapifying the reduced heap. Heaps are also used to manage memory dynamically by allocating and resizing memory blocks on the heap using functions like malloc() and realloc(). Priority queues, which can be implemented efficiently using binary heaps, are used for applications that require fast retrieval of the highest or lowest priority element, such as scheduling tasks.
Bfs algorithm & its application
Bfs algorithm & its application.
Breadth-first search (BFS) is an algorithm for traversing or searching tree or graph data structures. It starts at the tree root (or some arbitrary node of a graph, sometimes referred to as a 'search key'[1]) and explores the neighbor nodes first, before moving to the next level neighbors.
BFS and its application in finding connected components of graphs were invented in 1945 by Konrad Zuse, in his (rejected) Ph.D. thesis on the Plankalkül programming language, but this was not published until 1972.[2] It was reinvented in 1959 by E. F. Moore, who used it to find the shortest path out of a maze,[3][4] and discovered independently by C. Y. Lee as a wire routing algorithm (published 1961).[5][6]
Presentation on chikunguny
Chikungunya is a viral disease spread by mosquito bites. It is becoming a major problem in Bangladesh, with over 100 confirmed cases in Dhaka in recent months. The presentation will discuss what chikungunya is, how it is transmitted, its effects in Dhaka, and steps taken by the government and prevention methods. The virus causes fever and joint pain and is transmitted by Aedes mosquitoes.
A presentation on social networking sites
This document provides an overview of social networking sites. It discusses that social networking sites allow individuals to create public profiles and connect with others. The first social networking site was SixDegrees, which launched in 1971. Some of the most popular current sites are Facebook, Twitter, LinkedIn, Pinterest, Google+, Tumblr, Instagram, VK, Flickr and Vine. The document outlines the founders and users of Facebook, Twitter, and LinkedIn. It concludes with advantages like connecting people and sharing information, and disadvantages such as spreading false information and cyberbullying.
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Paper: https://eprint.iacr.org/2023/1886
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Blockchain
- 1. Welcome To Our Presentation Topic : Blockchain
- 2. Group Members • Mariea Akter 161-15-6711 • Amit Kundu 161-15-7149 • Md. Zahid Hasan 151-15-4960 • Khairul Alam Ovy 161-15-6979
- 3. What is Blockchain? Historical overview Mariea Akter (161-15-6711)
- 4. What is Blockchain? The blockchain is the technology running the bitcoin. It is a distributed database that maintains a continuously growing list of records called blocks secured from tampering and revision.
- 5. Historical overview Architecture and principal first designed for Bitcoin >A solution to make the database both secured and widely distributed >Actually the main innovation of the Bitcoin In 1991,secured chain of blocks was described by Stuart Haber and W. Scott Stornetta In 1992, Bayer, Haber and Stornetta incorporated Merkle trees to the design In 2008,the first blockchain was conceptualized by Satoshi Nakamoto
- 6. How blockchain works Amit Kundu (161-15-7149)
- 8. Chain
- 10. Technologies Behind Blockchain Applications of Blockchain Md. Zahid Hasan (151-15-4960)
- 11. Technologies Behind Blockchain Decentralization. Cryptography. Hashing Algorithm. Smart Contract. Proof of work. Proof of stake. Mining.
- 12. Applications of Blockchain Cryptrocurrencies. Smart Property. Insurance. Healthcare. Food Safety. Supply Chain. Voting System. Universal Identity.
- 13. Advantages and Disadvantages of Blockchain Khairul Alam Ovy (161-15-6979)
- 14. Advantages of Blockchain: 1. Greater transparency. 2. Enhanced security system. 3. Increased efficiency & speed. 4. Reduced costs.
- 15. Disadvantages of Blockchain: • 1.Complexity. • 2. Network size. • 3. Human error. • 4. Unavoidable security flow.