• Journal of Information Management
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• v.41 no.1
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• pp.1-22
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• 2010

The Korean government is pursuing the policy of broadening easy access to information by local residents and the range of public services provided to them. One of the most recent prominent examples is the evening circulation service offered by public libraries. In a sense of addressing issues facing the newly implemented service, this study aimed to present an improvement scheme on the basis of the results from analyzing the data such as background motivation, ways of publicity, service open time, service content, the present status of use of materials, satisfaction of users, and operating difficulties experienced, which were attained from the public libraries implementing the service as of June 2009 and the service users.

• Journal of Broadcast Engineering
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• v.24 no.4
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• pp.670-675
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• 2019

AM radio broadcasting has the advantage that the sound quality is lower than that of FM radio but the service area is wide and at night it can be transmitted even to overseas due to ionospheric reflection. AM radio broadcasts usually transmit large amounts of several tens to several hundreds of kilowatts (KW), requiring a lot of power, which is a financial burden on broadcasters. Recently, it is required to introduce a way to reduce the power of AM radio broadcasting in Korea. Therefore, it is possible to save a certain amount of power compared to the conventional AM radio broadcasting, and it is possible to maintain the existing license service area and sound quality, and what policies are needed to introduce the technology. In this paper, we predict the reduction of transmission power when a high efficiency transmission system is applied to existing AM radio broadcasting transmission system. As a result of the research, AMC adopting the high efficiency transmission method instead of the conventional AM radio transmission method, and when the modulation ratio of AM radio is 70%, if -3 dB companding is applied, the annual transmission power charge is decreased from 5,185,838,160Won to 3,528,900,086Won with saving of 32.0%, When -6 dB companding is applied, it is expected to be reduced to 2,608,378,934Won, which is 49.7% savings.