• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.28 no.8
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• pp.589-602
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• 2017

In this paper, we analyzed on the importance of radio spectrum and radio industry for promoting radio ecosystem. For this, we investigated the changes of future society and analyzed the recognition and importance of radio industries by survey on opinion changes of experts. We suggested a direction for radio industry promotion, which is composed of technology development, service development, advancement of law and regulations, business model development, assistance of production and use, publicity enforcement for promotion. The importance changes and radio use industry sector practices of the radio industry are analyzed by survey of experts. From this result, the 5 policy options are proposed.

• Journal of the Korea Convergence Society
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• v.8 no.1
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• pp.1-6
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• 2017

In this paper, we propose a new method for a correlative phase comparison direction finding(DF) which detects the arrival direction of radio waves by data fusing the calculated phase difference and the measured phase difference between the antennas when the radio waves are incident on the circular array antenna composed of 7 antennas respectively. The correlation type phase comparison method uses a uniform circular array(UCA) and a linear array method. The phase difference data calculated formally and the phase difference data measured in the test environment are fused with a correlation function, therefore, it is superior to the currently used phase comparison direction detection method. When the signal-to-noise ratio (SNR) of the received signal is 20dB and the inter-antenna distance to the wavelength of the received signal($L/{\lambda}$) is 0.5, the accuracy of the correlative DF is $1.7^{\circ}$ while measurement phase comparison's is larger than $2.5^{\circ}$, It can be used for electromagnetic signal monitoring and military direction detection.

• KASI NEWSLETTER
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• s.76
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• pp.5-5
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• 2008

• The Magazine of the IEIE
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• v.16 no.5
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• pp.67-72
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• 1989

• The Magazine of the IEIE
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• v.21 no.9
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• pp.1-3
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• 1994

• Journal of Korean Electronics
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• v.12 no.1
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• pp.14-15
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• 1992

• Information and Communications Magazine
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• v.8 no.3
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• pp.3-5
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• 1991

• 정보통신주요정책설명회
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• s.2004
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• pp.77-106
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• 2004

• Information and Communications Magazine
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• v.8 no.11
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• pp.3-7
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• 1991

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.20 no.3
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• pp.268-276
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• 2008

Potential tsunamis generated in Okinawa Trough were simulated for the investigation of the propagation characteristics in the southwestern sea of Korean Peninsula. Shallow waters in the continental shelf of East China Sea and deep waters in Okinawa Trough play an important role in the propagation characteristics of the tsunamis generated in this region. The propagation characteristics can be classified into two phases according to the stage of propagation. In the first phase, the tsunamis propagate both northeast and southwest along the deep water of the trough. In the second phase, the tsunamis enter the continental shelf of the East China Sea at right angles to topographic contour lines. Simulated results show that the tsunamis generated in the Okinawa Trough give a weak influence to the southern and western coasts of Korea due to the special topography of the southwestern sea of Korean Peninsula.