- published: 24 Apr 2014
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Samsung Group (Hangul: 삼성그룹; Hanja: 三星그룹; Korean pronunciation: [sam.sʌŋ ɡɯ'ɾup̚], informally Samsung) is a South Korean multinational conglomerate company headquartered in Samsung Town, Seoul. It comprises numerous subsidiaries and affiliated businesses, most of them united under the Samsung brand, and is the largest South Korean chaebol.
Notable Samsung industrial subsidiaries include Samsung Electronics (the world's largest information technology company measured by 2011 revenues),Samsung Heavy Industries (the world's second-largest shipbuilder measured by 2010 revenues), and Samsung Engineering and Samsung C&T (respectively the world's 35th- and 72nd-largest construction companies). Other notable subsidiaries include Samsung Life Insurance (the world's 14th-largest insurance company),Samsung Everland (the oldest theme park in South Korea) and Cheil Worldwide (the world's 19th-largest advertising agency measured by 2010 revenues).
Samsung produces around a fifth of South Korea's total exports and its revenues are larger than many countries' GDP; in 2006, it would have been the world's 35th-largest economy. The company has a powerful influence on South Korea's economic development, politics, media and culture, and has been a major driving force behind the "Miracle on the Han River".
A gear is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part in order to transmit torque. Two or more gears working in tandem are called a transmission and can produce a mechanical advantage through a gear ratio and thus may be considered a simple machine. Geared devices can change the speed, torque, and direction of a power source. The most common situation is for a gear to mesh with another gear, however a gear can also mesh a non-rotating toothed part, called a rack, thereby producing translation instead of rotation.
The gears in a transmission are analogous to the wheels in a pulley. An advantage of gears is that the teeth of a gear prevent slipping.
When two gears of unequal number of teeth are combined a mechanical advantage is produced, with both the rotational speeds and the torques of the two gears differing in a simple relationship.
In transmissions which offer multiple gear ratios, such as bicycles and cars, the term gear, as in first gear, refers to a gear ratio rather than an actual physical gear. The term is used to describe similar devices even when gear ratio is continuous rather than discrete, or when the device does not actually contain any gears, as in a continuously variable transmission.