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Class 3 Architectures of IS
1.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 1 Class 3 Architectures of IS Ano 2015 Sistemas de Informação para a Indústria António Grilo Prof. Auxiliar FCT-UNL
2.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 2 BIT AND BYTE Bit - Binary digit, represents smallest unit of data in the form of either 0 or 1. A bit (a contraction of binary digit) is the basic unit of information in computing and telecommunications; it is the amount of information stored by a digital device or other physical system that exists in one of two possible distinct states. Bits can be implemented in many forms. In most modern computing devices, a bit is usually represented by an electrical voltage or current pulse, or by the electrical state of a flip-flop circuit. Byte - String of bits, usually eight, stores one number or character. The byte is a unit of digital information in computing and telecommunications that most commonly consists of eight bits. Historically, a byte was the number of bits used to encode a single character of text in a computer and for this reason it is the basic addressable element in many computer architectures. The size of the byte has historically been hardware dependent and no definitive standards existed that mandated the size. The de facto standard of eight bits is a convenient power of two permitting the values 0 through 255 for one byte. The popularity of major commercial computing architectures have aided in the ubiquitous acceptance of the 8-bit size
3.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 3 BIT AND BYTE
4.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 4 INFORMATION TECHNOLOGY (IT) INFRASTRUCTURE Integrated framework upon which digital networks operate. This infrastructure includes data centers, computers, computer networks, Database Management devices, and a regulatory system. Evolution of IT infrastructure: General-purpose mainframe & minicomputer era: • 1959 to present - 1958 IBM first mainframes introduced - 1965 Less expensive DEC minicomputers introduced Personal computer era: 1981 to present: - 1981 Introduction of IBM PC - Proliferation in 80s, 90s resulted in growth of personal software
5.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 5 INFORMATION TECHNOLOGY (IT) INFRASTRUCTURE Client/server era: 1983 to present: - Desktop clients networked to servers, with processing work split between clients and servers - Network may be two-tiered or multitiered (N-tiered) - Various types of servers (network, application, Web) Enterprise computing era: 1992 to present: - Move toward integrating disparate networks, applications using Internet standards and enterprise application Cloud Computing: 2008 to present - Refers to a model of computing where firms and individuals obtain computing power and software applications over the Internet or other network - Fastest growing form of computing
6.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 6 TECHNOLOGY DRIVERS OF INFRASTRUCTURE EVOLUTION Moore’s law and microprocessing power - Computing power doubles every 18 months. Since the first magnetic storage device was used in 1955, the cost of storing a kilobyte of data has fallen exponentially, doubling the amount of digital storage for each dollar expended every 15 months, on average.. Metcalfe’s Law and network economics - Value or power of a network grows exponentially as a function of the number of network members. As network members increase, more people want to use it (demand for network access increases). Declining communication costs (towards 0) and the Internet, with an estimated 1.5 billion people worldwide have Internet access. Standards and network effects - Specifications that establish the compatibility of products and the ability to communicate in a network unleash powerful economies of scale and result in price declines as manufacturers focus on the products built to a single standard.
7.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 7 ADVANCES IN COMPUTER POWER: MACHINE BEATS MAN WATSON, IBM, 2008 JEOPARDY, 2008
8.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 8 ARTIFICIAL INTELLIGENCE
9.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 9 IT INFRASTRUCTURE HAS 7 MAIN COMPONENTS • Computer hardware platforms • Operating system platforms • Enterprise business applications • Data management and storage • Networking/telecommunications platforms • Internet platforms • Consulting system integration services
10.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 10 COMPONENTS OF A COMPUTER NETWORK Two or more connected computers. Major components in simple network: • Client computer • Server computer • Network interfaces (NICs) • Connection medium • Network operating system • Hub or switch • Router
11.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 11 DIGITAL NETWORKS
12.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 12 CLIENT/SERVER COMPUTING The client–server model is a computing model that acts as distributed application which partitions tasks or workloads between the providers of a resource or service, called servers, and service requesters, called clients. Often clients and servers communicate over a computer network on separate hardware, but both client and server may reside in the same system. A server machine is a host that is running one or more server programs which share their resources with clients. A client does not share any of its resources, but requests a server's content or service function.
13.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 13 PACKET SWITCHING Method of slicing digital messages into parcels (packets), sending packets along different communication paths as they become available, and then reassembling packets at destination. Previous circuit-switched networks required assembly of complete point-to-point circuit. Packet switching is more efficient use of network’s communications capacity.
14.
Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 14 TRANSMISSION CONTROL PROTOCOL / INTERNET PROTOCOL (TCP/IP) Connectivity between computers enabled by protocols. Protocols are rules that govern transmission of information between two points. It has four layers: - Application layer - Transport layer - Internet layer - Network interface layer
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Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 15 TYPES OF NETWORKS Local-area networks (LANs) - Client/server or peer-to-peer - Ethernet – physical network standard - Topologies: star, bus, ring Campus-area networks (CANs) Wide-area networks (WANs) Metropolitan-area networks (MANs)
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Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 16 NETWORKS Physical transmission media: - Twisted wire (modems) - Coaxial cable - Fiber optics and optical networks Wireless transmission media and devices: - Microwave - Satellites - Cellular telephones
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Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 17 PROPRIETARY SOFTWARE VS OPEN SOURCE Proprietary software is software developed by a supplier and made available for you to use under an end-user licence agreement (EULA), which you effectively accept when you install the software. The licence sets out how the software can be used and usually prohibits you from doing certain things, like making copies of the software and passing them on; or selling your licence to someone else. Most proprietary software comes without the source code. This is the code originally written by the programmer. Without this code neither you nor any other software supplier can make changes to the software package. When you buy a proprietary software package you are not buying the software - you are buying the right to use the software in a specific way. The software company owns the software. Most off-the-shelf packages are proprietary software.
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Sistemas de Informação
para Indústria © António Grilo 2015Departamento de Engenharia Mecânica e Industrial 18 PROPRIETARY SOFTWARE VS OPEN SOURCE Open source software is made available under a licence that allows you to make copies and pass them on to anyone. The software comes with its source code - which you can change to meet your needs. Licences for open source software do vary. Some licences require to make any changes made to the source code publicly available, while others will allow to keep those changes private. The licence agreement shhould be read before using or changing the software. Open source software is usually available for free download or off-the- shelf at a low cost.
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