• Journal of Advanced Navigation Technology
• /
• v.15 no.5
• /
• pp.714-721
• /
• 2011

In this paper, developing management programs for EMI tracking can navigate the site quickly and solve EMI tracking cause and location to use materials such as analysis of air accidents, EMI site location data of 1000 RF companys, radio wave spectrum analysis and audio data. these data are databased and used comparable data. Also, EMI has been prevented by establishing continuous monitoring system through a 24-hour surveillance. Therefore we were able to provide high quality air waves in order to prevent aircraft accidents. In addition, radar control staff of Korea Airports Corporation against passenger aircraft that will prevent the worst aircraft accident have been established based to continue periodic aviation frequency protection and Portable Electronic Devices(PED) on board aircraft to prevent the culture of safety campaign.

• The Journal of the Acoustical Society of Korea
• /
• v.29 no.4
• /
• pp.270-277
• /
• 2010

In this paper, we proposed an algorithm that improves tone quality of noisy audio signals by using ICA(Independent Component Analysis) algorithm and perceptual filters. Many algorithms have been proposed to eliminate the noise from the audio signals, such as spectral subtraction method, perceptual filter, etc. The perceptual filter uses a noise that is acquired from silent ranges in the input signal. In this case, the improvement rate of tone quality decreases if the noise energy is changed by the environmental variation in a signal frame. But the proposed method estimates a noise that is changed at each frame using ICA algorithm. The estimated noise is applied to perceptual filter. To show the performance of the proposed algorithm, several tests are performed to various input signals. With the proposed algorithm, we could confirm the enhancement of tone quality in terms of segmental SNR (SSNR), noise-to-mask ratio (NMR) and Degradation Category Rating (DCR) test.

• International Journal of Computer Science & Network Security
• /
• v.24 no.5
• /
• pp.165-171
• /
• 2024

The processes of society's informatization and digitalization necessitate the widespread use of new pedagogical technologies. Through these technologies, comprehensive disclosure of didactic functions of new methods of educational activity and the realization of the potential and creative potential. The use of information and computer multimedia technologies in teaching music art is especially relevant in the intensification of the development of interactive technologies, the transition to mixed forms of learning, and a period of socio-economic and sociopolitical upheavals. The study aims to substantiate the theoretical and applied principles of the analysis of multimedia technology learning musical art in modern conditions and assess the status and trends in their use in conducting educational activities. The study uses general scientific and unique methods of economic analysis, in particular, analysis and synthesis, analogy and comparison, generalization and systematization, and graphic ways. Regarding the results of the study of multimedia technologies for teaching musical art in current conditions, it was found that they contribute to the development of the seeker's creative, creative, and cognitive activity, have a positive impact on learning material, and diversify the educational process. Multimedia technologies such as presentations, programs for watching a video, listening to audio, music and singing karaoke, electronic encyclopedias, and Internet resources are proven to be the most used in music education. They have several qualitative and quantitative advantages, manifested in the possibilities of audio-visual presentation of educational material and significantly higher information density. It is suggested to strengthen the use of such computer programs as Microsoft Word, Ahead Nero, Finale, Adobe Audition, Sound Forge, and Microsoft PowerPoint for musical art classes.

• International Journal of Contents
• /
• v.8 no.2
• /
• pp.1-6
• /
• 2012

Recently, content-based music information retrieval (MIR) systems for mobile devices have attracted great interest. However, music retrieval systems are greatly affected by background noise when music is recorded in noisy environments. Therefore, we evaluated various pre-processing methods using the Philips method to determine the one that performs most robust music retrieval in such environments. We found that dynamic noise reduction (DNR) is the best pre-processing method for a music retrieval system in noisy environments.

• Proceedings of the Acoustical Society of Korea Conference
• /
• 1998.06c
• /
• pp.255-258
• /
• 1998

Sine파를 이용한 오디오 분석과 합성은 고음질 저비트율 오디오 부호화에 매우 효율적인 방법의 하나로 알려져 있다. 본 논문은 sine파를 이용한 오디오 분석과 합성에 중요한 sine파 검출에 심리음향모델을 활용하는 방안을 제안하였다. 모의실험 결과, 심리음향모델을 사용한 경우 사용하지 않은 경우에 비해 합성에 사용되는 sine파의 개수를 약 50% 정도 줄일 수 있었음을 알 수 있었다. 한편 오디로 신호의 attack이나 nonstationarity를 처리할 수 있는 방법이 sine파를 이용한 오디오 부호화에 필수적이라는 사실을 확인하였고 그에 대한 대처 방안을 제시하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2010.05a
• /
• pp.1225-1226
• /
• 2010

• Proceedings of the Korea Society of Design Studies Conference
• /
• 2000.11a
• /
• pp.110-111
• /
• 2000

급속한 디지털화는 디자인 환경을 전반적으로 변화시키고 있다. 디지털 환경은 디자인 대상을 다양화, 다변화시킬 뿐만 아니라 디자인 과정 역시 디지털화 시켜 프로세스의 효율성을 극대화시킨다. 이런 환경 속에서 디자인 프로세스는 디지털 환경을 적극 활용하여 보다 효율적이고 효과적인 방향으로 나가려는 노력을 기울이고 있다. (중략)

• Journal of Biomedical Engineering Research
• /
• v.8 no.2
• /
• pp.255-270
• /
• 1987

A medical image workstation was developed using multimedia technique. The system based on PC-486DX was designed to acquire medical images produced by medical imaging instruments and related audio information, that is, doctors' reporting results. Input information was processed and analyzed, then the results were presented in the form of graph and animation. All the informations of the system were hierarchically related with the image as the apex. Processing and analysis algorithms were implemented so that the diagnostic accuracy could be improved. The diagnosed information can be transferred for patient diagnosis through LAN(local area network).

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.2 no.1
• /
• pp.35-42
• /
• 1977

An analysis has been made about the performance of the switching-mode amplifier which can improve its efficiency higher than class C in audio amplification, and the improvement of characteristics and constitution in using it for modulator circuits was considered. As a result, the linearity of modulation up to 97% and the frequency response keeping flat up to 7, 200Hz have been observed.

• Proceedings of the KSR Conference
• /
• 2004.06a
• /
• pp.1247-1252
• /
• 2004

ATC(Automatic Train Control) system employed in Bundang urban transit is operated in accordance with automatic blocking equipment. Using AF(Audio Frequency) track circuits installed at a block section, the block signal is automatically controlled and the safety of train operation is supported. In this paper, we investigate the operation mode of bundang urban transit and analyze the operation algorithm of ATC on-board system.