• Journal of Satellite, Information and Communications
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• v.7 no.1
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• pp.122-127
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• 2012

The purpose of this study is to know about the interference on FM Radio channel from HD Radio signal. In Korea, a data service channel, named DARC is operated by a major FM radio broadcaster which has national wide service area. Therefore, an analysis of the interference on FM radio channel with DARC data channel from HD Radio, most recently developed digital radio system. Technical parameters of FM radio with DARC data channel and HD Radio system are considered for this simulation. As results some interference generated because of HD Radio signal according to its signal allocation and service mode of HD Radio.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.06a
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• pp.53-54
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• 2014

본 논문에서는 멀티채널 오디오 재생시스템을 구성하는 라우드스피커들이 표준위치와 상이한 위치에 존재할 경우 입력된 멀티채널 오디오 신호가 표현하는 음장감을 최대한 유지하면서 주어진 라우드스피커 배치환경에 최적으로 가상음원과 멀티채널 오디오 신호를 재생하는 방법을 제안한다. 능동잡음제어 기술에 이용되는 LSM 기술을 활용하여 원음장과 스피커를 통해 재생되는 복원음장 사이의 오차를 최소화하는 음향공간필터를 설계하여 적용하였으며, 청취평가를 통하여 음장감이 유지됨을 확인하였다.

• Journal of Biomedical Engineering Research
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• v.25 no.3
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• pp.227-233
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• 2004

In this paper, it is proposed that the four channel electrode arrangement at a frontal lobe and the noise reduction method using a JADE for the EEG biofeedback system. The proposed electrode arrangement is based on the retina-cornea dipole model. Using JADE and signals which are acquired by the proposed arrangement, four independent components are separated. To estimate a pure EEG component among four components, it is measured that a ratio of alpha wave to the whole signal and then the component that has a maximum value is considered as a pure EEG which the noise is eliminated. As a result of experiments, the proposed methods are effective in reduction of noises during acquisition of the EEG.

• Journal of the Korean Institute of Telematics and Electronics
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• v.21 no.4
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• pp.72-77
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• 1984

A placement program in LSI layout is developed and the results of test are discussed in this paper. In order to achieve 100% wiring, this paper introduces, as a virtual routing method, an algorithm which is close to the real routing. This algorithm is reflected to calculate the channel density. An object function is introduced to achieve minimization of total wire length, number of cuts, and maximum channel density simultaneously. The time complexity for the proposed virtual routing algorithm is O(n2). The time required for the algorithm is very short. This algorithm represents the routing state which is close to minimum wire length. So this algorithm is very proper to the application of placement problem. An auto-placement program is developed by the use of this algorithm. The efficiency of the proposed algorithm is shown in the test of the developed program.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.4
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• pp.702-706
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• 2009

The urethane based on prototype mold is very useful for making prototype. Especially, the method of stereolithography mold was turned out to be rapid and accurate 3-dimensional modeling data. Urethane resin (TSR-755) has heat resistant and is good for make hundreds of prototypes. In this study, we compared with various designed cooling channel and analyzed of cooling effect and deformation using commercial code Simpoe-Mold for injection mold. As a result, efficiently arranged cooling channel could make 19% of shrinkage to reduce and 46% cooling time to reduce.

• Journal of Satellite, Information and Communications
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• v.6 no.2
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• pp.35-40
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• 2011

The purpose of this study is to know about the interference on FM Radio channel from DRM+ signal. In Korea, a data service channel, named DARC is operated by a major FM radio broadcaster which has national wide service area. Therefore, an analysis of the interference on FM radio channel with DARC data channel from DRM+, most recently developed digital radio system. Technical parameters of FM radio with DARC data channel and DRM+ system are considered for this simulation. To maintain without no interference from DRM+, FM radio channel with DARC data channel should have the power level difference over 14.7dB at 150KHz frequency distance.

• Broadcasting and Media Magazine
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• v.17 no.2
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• pp.45-51
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• 2012

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1999.06b
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• pp.181-211
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• 1999

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37A no.9
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• pp.762-771
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• 2012

In this paper, we propose an adaptive power control scheme employing a self-optimization concept in femtocell systems, in order to improve system capacity, thereby reducing call-drop probability. In the proposed scheme, each femto base station(FBS) controls individual channel's transmission power base on two parameters; the neighboring cell's transmission power for each individual channel which is delivered from a femto-gateway and the received power strength from neighboring cells which is periodically measured by means of a spectrum sensing. Adaptive adjustment of individual channel's transmission power in accordance with femto mobile station(FMS) mobility features can also reduce undesirable handovers and evenly distribute traffic load over all femtocells. In addition, the manipulative control of channel's transmission power is able to keep the system coverage and the call-drop probability within an acceptable range, regardless of density of femtocells. Computer simulation shows that the proposed scheme outperforms existing schemes in terms of the system coverage and the call-drop probability.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.57-60
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• 2011

본 논문에서는 초고선명 디지털 TV 를 위한 차세대 멀티채널 사운드 시스템의 최적의 라우드스피커 레이아웃을 도출하기 위해 다양한 라우드스피커 배치 환경에서 인지 관점의 오디오 음질 주관평가를 실시하였다. NHK 22.2 채널 시스템, ITU-R BS.775-2 표준의 7.1 채널 시스템과, 실감 음향에 가장 중요한 역할을 하는 Top Layer 라우드스피커에 중점을 두고 다양한 신규 레이아웃 구성들을 비교하였으며, 스튜디오에서 믹싱된 컨텐츠와 B-format 레코딩을 멀티채널로 생성한 컨텐츠를 이용하여 주관 평가를 실시하였다. 주관 평가 결과, Top Layer 에 3 개의 라우드스피커를 가지는 10.2 채널 라우드스피커 레이아웃이 평가에서 사용된 전체적인 오디오 음질의 등급에서 NHK 22.2 채널 시스템과 차이를 인지하기 어렵다는 결과를 도출하였다.