• 한국자기학회:학술대회 개요집
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• 한국자기학회 2002년도 동계연구발표회 논문개요집
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• pp.200-201
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• 2002

Recently, a countermeasure for the electromagnetic noise emission on RF integrated transmission line using the loss generation of ferromagnetic thin films is briefly suggested$\^$1,2/. Without the magnetic film, the noise harmonics of the signal pass through the transmission line with only a little attenuation. The ideal role of magnetic film is not to raise insertion losses in the pass-band and to give as large attenuation as possible to eliminate the noise harmonics at the stop-band, the frequency range higher than the meaningful signal as shown in Fig. 1. and Fig. 2. (omitted)

• Journal of Communications and Networks
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• 제14권1호
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• pp.27-33
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• 2012

In this paper, a new blind signal processing scheme for equalization in fading and impulsive-noise channel environments is introduced based on probability density functionmatching method and a set of Dirac-delta functions. Gaussian kernel of the proposed blind algorithm has the effect of cutting out the outliers on the difference between the desired level values and impulse-infected outputs. And also the proposed algorithm has relatively less sensitivity to channel eigenvalue ratio and has reduced computational complexity compared to the recently introduced correntropy algorithm. According to these characteristics, simulation results show that the proposed blind algorithm produces superior performance in multi-path communication channels corrupted with impulsive noise.

• 한국음향학회지
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• 제30권4호
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• pp.207-214
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• 2011

사람의 청력은 노화로 인해 자연스럽게 저하된다. 하지만 최근 들어 젊은 나이에 난청이 발생하는 경우가 크게 늘고 있다. 이처럼 난청인구가 증가하는 가장 큰 이유는 각종 휴대용 멀티미디어 기기의 대중화에 기인한다. 현재 이어폰/헤드폰으로 유발되는 소음성 난청 연구는 많이 이루어지고 있으나, 직접적인 휴대전화 통화에 따른 소음성 난청유발에 대한 연구는 거의 없다. 본 연구에서는 선행 조사를 토대로, 골전도 스피커에 Active Noise Reduction기술을 접목하여 소음성 난청을 예방하는 기술을 제안한다. 이 기술은 주변소음을 골전도 스피커를 통해서 능동적으로 역위상 진동을 부과하여 노이즈를 줄이는 방법이다. 제안한 시스템을 적용할 경우 실제 청각에 유입되는 소음레벨이 12 dB 이상 감소되며, 이러한 음량 감소폭은 휴대폰 통화에 따른 소음성난청 요인을 근본적으로 예방하는 것이다. 감성실험 결과 통화음량이 감소된 상황에서도 원활한 통화가 가능하였다.

• 한국정보통신학회논문지
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• 제11권5호
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• pp.961-968
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• 2007

오늘날, 우리는 어디엔가 엔제나 무전기 통신 장치를 사용할수 있다. 때때로, 우리는 음향잡음환경에서 장치를 사용하였다. 그 음향잡음은 통신장치에서 많은 문제를 만들었다. 음향잡음환경에서는, 말은 음성신호와 잡음신호 양쪽에 신호를 포함하고, 받았기 때문에 깨끗한 정보를 받기위해 보낼수가 없었다. 디지털필터는 바라는 신호를 얻기 위해 옮기는 잡음으로서 유용하였다. 방법의 하나는 자동적으로 맞추는 필터 파라미터로서 적응 잡음 망상조직으로 적응디지털필터를 사용하는 것이다. 본 논문은 두 적응필터 방법에 의하여 현실에서 음향잡음으로서 명료도 알고리즘의 번지라고 할 수가 있다. 하나는 두 입력 채널과 함께 적응잡음 망상조직이라 할 수 있고, 또 다른 것은 하나 입력 채널과 함께 스펙트럼 빼기필터이다. 이 실험의 결과는 제안된 필터로부터 스펙트럼 진폭필터는 움직이지 않는 잡음은 효력이 있는 동안 움직이는 것을 줄이기 위해 사용되어지는 것은 적응잡음망상조직으로 보여준다.

• Journal of information and communication convergence engineering
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• 제1권1호
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• pp.35-38
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• 2003

Analyses of performance of wireless broadband communication systems employing fiber-optic link have presented. We have analyzed CNR penalty to evaluate system performance by taking into account, radio link considering rainfall attenuation, and optical link considering several carrier-to-noise ratio versus the optical modulation index.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.168-172
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• 2003

This paper analyzes the output noise and the noise figure of common source MOSFET pair each input of which is separately driven in the different frequencies. This analysis is performed for concurrent dual band cascode CMOS LNA with double inputs and single output fabricated in $0.18{\mu}m$ CMOS process. Since both inputs and output are matched to near $50{\Omega}$ using on-chip inductors, the measured noise figures are much higher than those of usual CMOS LNA. But, the main concern of this paper is focused on the added noise features due to the other channel common source stage. The dual-band LNA results in noise figure of 4.54dB at 2.14GHz and 6.03dB at 5.25GHz for selectable operation and 7.44dB and 6.58dB for concurrent operation. The noise analysis explains why the added noise at each band shows so large difference.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1643-1647
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• 2003

This paper, we propose a new high noise immunity phase-locked loop(PLL) which can suppress the high incident noise coupling with large amplitude and long period to the input frequency of PLL and keeps constant frequency and phase of the VCO output for providing the high stability distribution clock pulse.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1881-1884
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• 2003

In some requirements of dc motor drive circuit applications are high quality output with generation of low internal conducted EMI. However the conventional dc motor drive circuits have been usually using unbalanced circuit which generates the high conducted EMI to the frame ground. This paper presents a balanced dc motor drive circuit which is effective way to reduce the common-mode noise. The circuit balancing is to make the noise pick up or occurring in both conductor lines, signal path and return path is equal in amplitude and opposite phase so that it will cancel out in the frame ground. The common-mode conducted noise reduction of this proposed dc motor drive is confirmed by experimental results.

• 센서학회지
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• 제21권6호
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• pp.429-433
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• 2012

In this paper, we reduced the optical noise interference in a visible light communication system using two color LEDs. In the transmitter, the original and the inverted signals of the transmitted data modulated a red LED and a blue LED, respectively. In the receiver, a differential detector which is composed of two photodetectors and an optical red filter detected the mixed signal radiated from the two LEDs. In an environment that the optical noise from a fluorescent lamp exists, the signal-to-noise ratio in this system was improved by about 20dB compared to that in the conventional system which uses a single LED and a single photodetector.

• 한국멀티미디어학회논문지
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• 제21권11호
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• pp.1317-1326
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• 2018

A common treatment for tinnitus rehabilitation is to use a device called a sound generator to continuously supplying the sound stimuli. The devices usually provides a sound called white noise, or pink noise, which are common in nature. In this paper, we developed a mobile system for tinnitus diagnostics and therapy using Android mobile applications. The first step for tinnitus diagnostics is detecting an exact tinnitus frequency of the patients, therefore we provide a bark scale tinnitus detection algorithm for fast and accurate diagnostics. Also, the system can provide various stimuli sounds including white noise, pink noise, brown noise, nature sounds, and binaural beats. Also we provides the therapeutic functions through questionnaires to solve existing problems of the patients.