Friday, August 29, 2008

    More Future at DD-WRT v24

    Author: webmaster | Posted at: 10:12 PM | Filed Under: , , |
    Features

    DD WRT v24 more stable, more future

    Author: webmaster | Posted at: 9:53 PM | Filed Under: , , |
    DD-WRT is free Linux-based firmware for several wireless routers, most notably the Linksys WRT54G (including the WRT54GL and WRT54GS). It is licensed under the GNU General Public License version 2.

    Many of DD-WRT's features are not included in typical router firmware. These features include support for the Kai network, daemon-based services, IPv6, Wireless Distribution System, RADIUS, advanced quality of service, radio output power control, overclocking capability, and software support for a Secure Digital Card hardware modification.

    DD-WRT versions up to v22 were based on the Alchemy firmware from Sveasoft, which in turn is based on the original Linksys firmware. DD-WRT versions from v23 onwards, however, are almost completely rewritten. The Linux kernel part is based on the OpenWrt kernel, which started as a Linksys-based firmware but later changed to its own build framework. All of the firmwares are based on Linux, as are OpenWrt and Alchemy.

    Through a partnership with Buffalo Technology, Buffalo will begin shipping routers pre-installed with a customized version of DD-WRT.

    The major releases to date include:

    DD-WRT v23 Service Pack 1 (SP1) was released on May 16, 2006. Much of the code was overhauled and rewritten during the development of this release, and many new features were added.

    DD-WRT v23 Service Pack 2 (SP2) was released on September 14, 2006. The interface was overhauled, and some new features were added. Some additional router models are supported, with more planned.

    DD-WRT v24 was released on May 18, 2008. It allows up to 16 virtual interfaces with different SSIDs and encryption protocols. There is support for some PowerPC, IXP425-based router boards, Atheros WiSOC and X86 based systems. There is also limited support for routers with low flash memory (ex. WRT54Gv8 or WRT54GSv7).

    DD-WRT v24 Service Pack 1 (SP1) was released on July 26, 2008. Urgent DNS security issue fixed for DNSMasq, Site Survey security fixes, longer passwords, and flexible OpenVPN configurations. New hardware supported, including WRT300 v1.1, WRT310N, WRT600N, Tonze AP42X Pronghorn SBC, Ubiquiti LSX and Netgear, Belkin and USR devices.

    Features

    List of features in all versions


    		 Micro (for routers with 2 MB of flash) Mini Standard VOIP VPN Mega (for routers with 8+ MB of flash)
    ChilliSpot No No Yes Yes No Yes
    HTTPS Support for Web Management No No Yes Yes Yes Yes
    IPv6 No No Yes Yes Yes Yes
    XLink Kai No No Yes No No Yes
    MMC/SD Card Support No No Yes Yes Yes Yes
    NoCat No No Yes Yes Yes Yes
    OpenVPN No No No No Yes Yes
    PPTP/PPTP Client No Yes Yes Yes Yes Yes
    radvd Yes Yes Yes Yes No Yes
    RFlow No No Yes Yes Yes Yes
    Samba/CIFS client No No Yes Yes Yes Yes
    Milkfish SIP Router No No No Yes No Yes
    SNMP No No Yes Yes Yes Yes
    SSH No Yes Yes Yes Yes Yes
    UPnP Yes (SP2) Yes Yes Yes Yes Yes

    Controversy

    In July 2006, the DD-WRT Shop started offering a commercial version of the router firmware built with additional, non-open source code.[3] It includes increased functionality such as per-user bandwidth control. Because the GPL license has a provision against binary-only public distribution of derivative works, this would appear to be a license violation, as pointed out by one contributor to the project.[4]Also around that time, the license text was changed to specify that some software components were not licensed under the GPL. The web interface, one of the non-GPL components, was encrypted to prevent its reverse engineering and rebranding.

    The person who released the commercial version wrote a response to these allegations in his blog and stated that the source code was in fact available.[5] The license text was reverted back to the unmodified GPL license.

    Ferrari company's sports

    Author: webmaster | Posted at: 11:51 AM | Filed Under: , |
    ,

    Ferrari S.p.A. is an Italian sports car manufacturer based in Maranello, Italy. Founded by Enzo Ferrari in 1929 as Scuderia Ferrari, the company sponsored drivers and manufactured race cars before moving into production of street legal vehicles in 1947 as Ferrari S.p.A.. Throughout its history, the company has been noted for its continued participation in racing, especially in Formula One, where it has enjoyed great success.

    After years of financial struggles, Enzo Ferrari sold the company's sports car division to the Fiat group in 1969 to ensure continued financial backing. Enzo Ferrari retained control of the racing division until his death in 1988 at the age of 90. Earlier that year he had overseen the launch of the Ferrari F40; the last new Ferrari to be launched before his death, and arguably one of the most famous supercars ever made.

    Ferrari also has an internally managed merchandising line that licenses many products bearing the Ferrari brand, including eyewear, pens, pencils, electronic goods, perfume, clothing, high-tech bicycles, cell phones, and even laptop computers.

    In 2007 the Financial Times put Ferrari at the top of its list of 100 Best Workplaces in Europe.

    Helicopter - Craft

    Author: webmaster | Posted at: 11:33 AM | Filed Under: |

    Helicopter or Craft

    A helicopter is an aircraft that is lifted and propelled by one or more horizontal rotors, each rotor consisting of two or more rotor blades. Helicopters are classified as rotorcraft or rotary-wing aircraft to distinguish them from fixed-wing aircraft because the helicopter derives its source of lift from the rotor blades rotating around a mast. The word 'helicopter' is adapted from the French hélicoptère, coined by Gustave de Ponton d'Amecourt in 1861. It is linked to the Greek words helix/helik- (ἕλικ-) = "spiral" or "turning" and pteron (πτερόν) = "wing".[1][2]

    As an aircraft, the primary advantages of the helicopter are due to the rotor blades that revolve through the air, providing lift without requiring the aircraft to move forward. This creates the ability for the helicopter to take off and land vertically without the need for runways. For this reason, helicopters are often used in congested or isolated areas where fixed-wing aircraft are not able to take off or land. The lift from the rotor also allows the helicopter to hover in one area and to do so more efficiently than other forms of vertical takeoff and landing (VTOL) aircraft, allowing it to accomplish tasks that fixed-wing aircraft are unable to perform.

    Although helicopters were developed and built during the first half-century of flight, some even reaching limited production, it was not until 1942 that a helicopter designed by Igor Sikorsky reached full-scale production,[3] with 131 aircraft built.[4] Even though most previous designs used more than one main rotor, it was the single main rotor with antitorque tail rotor configuration of this design that would come to be recognized worldwide as the helicopter.


    History

    Since 400 AD, Chinese children have played with bamboo flying tops. This toy made its way to Europe and is depicted in a 1463 European painting.[5] Pao Phu Tau (抱朴子) was a 4th-century book in China reported to describe some of the ideas inherent to rotary wing aircraft:[6]

    “ Someone asked the master about the principles of mounting to dangerous heights and traveling into the vast inane. The Master said, "Some have made flying cars with wood from the inner part of the jujube tree, using ox-leather [straps] fastened to returning blades so as to set the machine in motion."[7] ”

    Leonardo da Vinci conceived a machine that could be described as an "aerial screw".[8] He wrote that he made small flying models [9] but could not stop the rotor from making the whole craft rotate. Later machines would more closely resemble the ancient bamboo flying top, with spinning wings rather than screws.

    In July 1754, Mikhail Lomonosov showed the Russian Academy of Sciences a small coaxial rotor powered by a wound-up spring, intended to lift meteorological instruments.[9]

    In 1783, Christian de Launoy, and his mechanic, Bienvenu, made a model pair of counter-rotating rotors (not coaxial) using turkey's flight feathers as rotor blades, and in 1784 demonstrated it to the French Academy of Sciences.[9]

    In 1861, the word "helicopter" was coined by Gustave de Ponton d'Amécourt,[9] a French inventor who demonstrated a small steam-powered model.

    From 1860 to 1880, many small helicopter models were designed and made.[9] These included Alphonse Pénaud's model coaxial rotors, powered by twisted rubber bands (1870). Enrico Forlanini's unmanned helicopter was powered by a steam engine. It was the first of its type that rose to a height of 13 meters, where it remained for some 20 seconds, after a vertical take-off from a park in Milan (1877). Emmanuel Dieuaide's design featured counter-rotating rotors and was steam-powered through a hose from a boiler on the ground (1877). Melikoff designed a "man carrier," but it was almost certainly not built (1877). Dandrieux's design had counter-rotating rotors and a 7.7-pound (3.5-kilogram) steam engine. It rose more than 40 feet (12 m) and flew for 20 seconds (circa 1878).

    In the 1880s, Thomas Edison experimented with small helicopter models in the USA. First he used a guncotton-powered engine, but it caused damage by explosions, and tests were ended. Next he used an electric motor. His tests showed that a large rotor with low blade area was needed.

    Ján Bahýľ, a Slovak inventor, developed a model helicopter powered by an internal combustion engine, that in 1901 reached a height of 0.5 meters. On 5 May 1905, his helicopter reached four meters in altitude and flew for over 1,500 meters.[10]

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