Posts tagged ‘Computer’

February 11, 2013

Wearable Computer

Wearable computers, also known as body-borne computers, are miniature electronic devices that are worn by the bearer under, with or on top of clothing. One of the main advantages of a wearable computer is consistency: there is a constant interaction between the computer and user, i.e. there is no need to turn the device on or off. Another useful feature is the ability to multi-task: it is not necessary to stop what you are doing to use the device; it is augmented into all other actions.

These devices can be incorporated by the user to act like a prosthetic. It can therefore be an extension of the user’s mind and/or body. Many issues are common to the wearables as with mobile computing, ambient intelligence (electronic environments that are sensitive and responsive to the presence of people), and ubiquitous computing research communities, including power management and heat dissipation, software architectures, wireless and personal area networks.

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February 29, 2012

Raspberry Pi

The Raspberry Pi (or RasPi) is a $35 single-board computer developed in the UK by the Raspberry Pi Foundation which aims to ‘promote the study of computer science and related topics, especially at school level, and to put the fun back into learning computing.’ The design is based around a Broadcom BCM2835 system on a chip (SoC), which includes a 700 MHz ARM CPU, VideoCore IV GPU, and 256 Megabytes of RAM. The design does not include a built-in hard disk or solid-state drive, instead relying on an SD card for booting and long-term storage.

The foundation has released one model (Model B) initially, and a second model (Model A) will be released sometime later. Model A will have one USB port and no Ethernet controller, and will cost $25, while Model B contains two USB ports and a 10/100 Ethernet controller and costs $35. Though the Model A doesn’t have an RJ45 Ethernet port, it can connect to a network by using a user-supplied USB Ethernet or Wi-Fi adapter. As is typical of modern computers, generic USB keyboards and mice are compatible with the Raspberry Pi. The system will use a Linux kernel-based operating systems.

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February 15, 2012



An exocortex is a theoretical artificial external information processing system that would augment a brain’s biological high-level cognitive processes. An individual’s exocortex would be composed of external memory modules, processors, IO devices and software systems that would interact with, and augment, a person’s biological brain. Typically this interaction is described as being conducted through a direct brain-computer interface, making these extensions functionally part of the individual’s mind. Individuals with significant exocortices could be classified as cyborgs or transhumans.

Cortex (Latin: bark) is used in neuroscience for the outer bark-like layer of the brain that is the site of most sophisticated cognitive information processing. It was coined in allusion to the neocortex (literally ‘new bark’), the newest part of the mammalian brain (in evolutionary history), believed to be responsible for the highest human cognitive abilities including conscious thought, spatial reasoning, and sensory perception. Thus the terminology suggests a progression from reptilian thought (the older parts of the brain) through human (neocortex) to high-level human or even supra-human cognitive processing capabilities (exocortex).

January 17, 2012



plug computer

FreedomBox is a community project to develop, design and promote personal servers running free software for distributed social networking, email and audio/video communications. The project was announced by Columbia Law professor Eben Moglen at an ISOC (Internet Society) meeting in 2010.

The project currently describes a FreedomBox as, ‘a personal server running a free software operating system, with free applications designed to create and preserve personal privacy.’ The project aims to develop a software stack that can run on plug computers (small computers the size of a wall wart) that can easily be located in individual residences or offices. By promoting a decentralized deployment of hardware, the project hopes that FreedomBoxes will ‘provide privacy in normal life, and safe communications for people seeking to preserve their freedom in oppressive regimes.’

March 21, 2011


asimov by David A Johnson

Multivac is the name of a fictional supercomputer in many stories by Isaac Asimov. Like most of the technologies Asimov describes in his fiction, Multivac’s exact specifications vary among appearances. In all cases, it is a government-run computer that answers questions, usually buried deep underground for security purposes. However, Asimov never settles on a particular size for the computer except for mentioning it is very large.

Unlike the artificial intelligences portrayed in his ‘Robot’ Series, Multivac’s interface is mechanized and impersonal, consisting of complex command consoles few humans can operate. Though the technology depended on bulky vacuum tubes, the concept – that all information could be contained on computer(s) and accessed from a domestic terminal – constitutes an early reference to the possibility of the Internet.

November 11, 2010

Quantum Computer


A quantum computer is a device for computation that makes direct use of quantum mechanical phenomena, such as superposition and entanglement, to perform operations on data. Quantum computers are different from traditional computers based on transistors. The basic principle behind quantum computation is that quantum properties can be used to represent data and perform operations on these data. If large-scale quantum computers can be built, they will be able to solve certain problems much faster than any current classical computers (for example Shor’s algorithm). The Bloch sphere is a representation of a qubit, the fundamental building block of quantum computers.

A classical computer has a memory made up of bits, where each bit represents either a one or a zero. A quantum computer maintains a sequence of qubits. A single qubit can represent a one, a zero, or, crucially, a quantum superposition where it is all possible states simultaneously. Although quantum computing is still in its infancy, experiments have been carried out in which quantum computational operations were executed on a very small number of qubits. Both practical and theoretical research continues, and many national government and military funding agencies support quantum computing research to develop quantum computers for both civilian and national security purposes, such as cryptanalysis.