• Korean journal of communication and information
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• v.59
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• pp.71-91
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• 2012

Gun-Ho Song had been selected as 'the most respected person' in a survey targeting journalists. While being a journalist, Gun-Ho Song had directly experienced that the press submitted to government suppression and became commercialized receiving government benefits. In 1975, when Dong-A Ilbo(Daily News) submitted to the government suppression and conducted a mass of discharge of journalists, he felt responsibility and left the newspaper company. After that, he criticized more sharply the media subordinated to the power and capital. The core of Gun Ho Song's thought of the press is that the media should be independent from the power and capital contributing to nationalism and democracy. Also, he insisted that journalists should equip with historical consciousness and social scientific knowledge beyond roles like skilled workers. His idea of the press is still valid in the current media situation showing that journalists become skilled workers and independence of the press is risky. Looking into his activity and idea of the press can help seek for the right attitude of journalists and right roles of the media in the change of media environment.

• Review of Korea Contents Association
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• v.6 no.4
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• pp.46-50
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• 2008

• 건축구조
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• v.19 no.3
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• pp.11-12
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• 2012

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.04a
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• pp.76-76
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• 2006

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.471-471
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• 2006

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.472-472
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• 2006

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2005.11a
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• pp.132-133
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• 2005

• Journal of Magnetics
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• v.18 no.4
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• pp.481-486
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• 2013

An electromagnetic launcher (EML) system accelerates and launches a projectile by converting electric energy into kinetic energy. There are two types of EML systems under development: the rail gun and the coil gun. A railgun comprises a pair of parallel conducting rails, along which a sliding armature is accelerated by the electromagnetic effects of a current that flows down one rail, into the armature and then back along the other rail, but the high mechanical friction between the projectile and the rail can damage the projectile. A coil gun launches the projectile by the attractive magnetic force of the electromagnetic coil. A higher projectile muzzle velocity needs multiple stages of electromagnetic coils, which makes the coil gun EML system longer. As a result, the installation cost of a coil gun EML system is very high due to the large installation site needed for the EML. We present a coil gun EML system that has a new structure and arrangement for multiple electromagnetic coils to reduce the length of the system. A mathematical model of the proposed coil gun EML system is developed in order to calculate the magnetic field and forces, and to simulate the muzzle velocity of a projectile by driving and switching the electric current into multiple stages of electromagnetic coils. Using the proposed design, the length of the coil gun EML system is shortened by 31% compared with a conventional coil gun system while satisfying a target projectile muzzle velocity of over 100 m/s.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.986-987
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• 2008

This paper deals with the novel type DAVR(digital Automatic voltage Regulator) of the field control system for improving the response and efficiency. The proposed Hybrid type Synchronous Generator consists of permanent magnet which can generate the constant voltage with controlless and field winding. Using Buck-type PWM converter, the response can be improved in the proposed system. The proper operation of the proposed excitation system was verified through the design and experiments.

• Proceedings of the Korean Society of Crop Science Conference
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• 2000.04a
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• pp.334-335
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• 2000