Apr 7, 2012

Arithmetic Logic Unit (ALU)

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In computing, an arithmetic logic unit (ALU) is a digital circuit that performs arithmetic and logical operations. The ALU is a fundamental building block of the central processing unit of a computer, and even the simplest microprocessors contain one for purposes such as maintaining timers. The processors found inside modern CPUs and graphics processing units (GPUs) accommodate very powerful and very complex ALUs; a single component may contain a number of ALUs.
Mathematician John von Neumann proposed the ALU concept in 1945, when he wrote a report on the foundations for a new computer called the EDVAC. Research into ALUs remains an important part of computer science, falling under Arithmetic and logic structures in the ACM Computing Classification System.
 
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Apr 6, 2012

Glimpse of GIS (1)

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Before the 1940s, geographical analysis was done by overlapping (overlay) several types of maps in certain areas. But since the 1950's developed a digital system to perform the analysis in solving spatial problems. Until now, the various roles of Geographic Information Systems have been developed that can be used to address various aspects of the problems related to space.
Developments in the field of computer technology has brought enormous benefits for the dissemination of information. With the internet, for example, we can see the beautiful places in all corners of the world when it looks utilizing geographic information systems. Geograft information system (GIS) are happier than the information system applied to geographic data or data base tools for analysis and mapping, and there is something that happens on earth. GIS is becoming known in the 1950s.
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Central Processing Unit (CPU)

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The central processing unit (CPU) is the portion of a computer system that carries out the instructions of a computer program, to perform the basic arithmetical, logical, and input/output operations of the system. The CPU plays a role somewhat analogous to the brain in the computer. The term has been in use in the computer industry at least since the early 1960s. The form, design and implementation of CPUs have changed dramatically since the earliest examples, but their fundamental operation remains much the same.
On large machines, CPUs require one or more printed circuit boards. On personal computers and small workstations, the CPU is housed in a single silicon chip called a microprocessor. Since the 1970s the microprocessor class of CPUs has almost completely overtaken all other CPU implementations. Modern CPUs are large scale integrated circuits in packages typically less than four centimeters square, with hundreds of connecting pins. Two typical components of a CPU are the arithmetic logic unit (ALU), which performs arithmetic and logical operations, and the control unit (CU), which extracts instructions from memory and decodes and executes them, calling on the ALU when necessary. Not all computational systems rely on a central processing unit. An array processor or vector processor has multiple parallel computing elements, with no one unit considered the "center". In the distributed computing model, problems are solved by a distributed interconnected set of processors.
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Glimpse of GIS (2)

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Since the 1970's, the GIS has developed rapidly. This development was mainly the development of information technology and telecommunications, among others:
Revolution of information technology: computer technology, remote sensing and Global Positioning Systems. Technology communication. Drastically decreases the price of computers and the increasing speed of computer work. Increasing software functionality and ease of use. Evidence of the adage "a picture is worth a thousand words. Roman face of the earth related to our lives.
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Apr 5, 2012

HyperText Markup Language (HTML)

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HyperText Markup Language (HTML) is the main markup language for web pages. HTML elements are the basic building-blocks of webpages. HTML is written in the form of HTML elements consisting of tags enclosed in angle brackets (like <html>), within the web page content. HTML tags most commonly come in pairs like <h1> and </h1>, although some tags, known as empty elements, are unpaired, for example <img>. The first tag in a pair is the start tag, the second tag is the end tag (they are also called opening tags and closing tags). In between these tags web designers can add text, tags, comments and other types of text-based content. The purpose of a web browser is to read HTML documents and compose them into visible or audible web pages. The browser does not display the HTML tags, but uses the tags to interpret the content of the page.
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