• The Journal of the Acoustical Society of Korea
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• v.21 no.4E
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• pp.146-155
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• 2002

We present a new technique for achieving source separation when given only a single charmel recording. The main idea is based on exploiting the inherent time structure of sound sources by learning a priori sets of time-domain basis functions that encode the sources in a statistically efficient manner. We derive a learning algorithm using a maximum likelihood approach given the observed single charmel data and sets of basis functions. For each time point we infer the source parameters and their contribution factors. This inference is possible due to the prior knowledge of the basis functions and the associated coefficient densities. A flexible model for density estimation allows accurate modeling of the observation, and our experimental results exhibit a high level of separation performance for simulated mixtures as well as real environment recordings employing mixtures of two different sources. We show separation results of two music signals as well as the separation of two voice signals.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.1243-1246
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• 1998

Three-dimensional(3-D) sound is a technique for generating or recreating sounds so they are perceived as emanating from locations in a three-dimensional space. Three dimensional sound has the potential of increasing the feeling of realism in music or movie soundtracks. Three-dimensional sound effects depend on psychoacoustic spectral and phase cues being presented in a reproduced signal. In this paper we propose an effective algorithm for the sound image expansion in television system using stereo image enhancement techniques. Compared to the other techniques of three-dimensional sound, the proposed algorithm use only two speakers to enhance the sound image expansion, while maintaining the original sound characteristics.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.406-409
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• 2009

팝음악이 국내에 들어오면서 우리와는 체격조건이 다른 그들의 노래를 부르기 위해 가수들은 부단히애를 써야 했으며, 많은 시행착오를 겪었다. 때론 무리한 발성으로 인해 성대가 손상되는 경우도 비일비재 하였다. 가수 조용필은 자신의 신체적인 한계를 극복하여 가창력을 최대화 시킬 수 있는 해법을 우리의 국악에서 찾았다. 그 대표적인곡이 바로 "창밖의 여자"인데 이 노래는 조용필의 최고의 히트곡이자 가요발성에 있어 새로운 전환점을 만들어준 곡이다. 본 연구에서는 당시의 시대적, 음악적인 배경 등을 통해 가요계의 전반적인 상황이 어떠했는지를 파악하여 왜 그 노래가 당시엔 획기적인 창법이었는지 그 이유를 제시해 보고자 한다. 또한 "창밖의 여자"의 곡의 흐름과 감정처리 방법, 테크닉 등을 분석해 봄으로써 호흡과 발성이 어떻게 이루어지고 표현되었는지를 연구해 보도록 하겠다.

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.872-875
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• 2002

A digital watermarking technique applying psychoacoustic model for audio signal is proposed in this paper. In the watermarking scheme, the pseudo-random bit stream used as a watermark signal is embedded into the audio signal in both speech and music. The strength of the embedded signal is subject to the human auditory system in such a way that the disturbances on host audio signal are beyond the sensing of human ears. The experimental results show that the quality of the watermarked audio signal, in term of signal to noise ratio, can be improved up to 3.2 dB.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.3-6
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• 2003

본 논문에서는 다중 경로 페이딩 하에서 동작하는 동기식 DS-CDMA 시스템에서 특별히 근거리 또는 실내 수신의 경우에 발생할 수 있는 짧은 시간 내에 밀집된 다중 경로 성분을 구분해 낼 수 있는 견고한 지연 추정 알고리즘을 제안한다. Sliding correlator 출력에 대한 시평균 상관 행렬을 고유치 분석을 통하여 eigenvector로 분해한 다음 관찰 영역은 신호 부분 영역과 잡음 부분 영역으로 분리할 수 있다. 제안하는 알고리즘에서는 단순한 기존의 sliding correlator 나 잡음공간 만으로의 projection 을 통한 MUSIC-type 알고리즘보다 성능이 월등히 뛰어난 ML (Maximum likelihood) 방식을 소개한다. 이 방식은 기존의 방식보다 복잡도는 약간 증가하지만 지연 측정 성능은 탁월하게 증가하는 것을 보여준다.

• Journal of the Korea Fashion and Costume Design Association
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• v.7 no.3
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• pp.7-15
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• 2005

Culture industry is appearing as an important sector of economy. Many kinds of culture industry like movie, music, drama, animation and game are creating enormous wealth all over the world. Fashion is a kind of culture industry too and even sometimes treated as art. Korean fashion is not treated as real culture but still as a part of textile industry. Internationally Korean fashion has not yet much to show, and despite of it's potential it does not attract much interest from other countries. In this paper properties and effects of mulberry handmade paper clothes were investigated with five clothes made of it. In making handmade mulberry paper clothes various techniques could be applied and these techniques could bring new effects. Because mulberry handmade paper does not have little flexibility than ordinary texture, much efforts should be put to the detail works. Handmade mulberry paper clothes have enormous potential as art, because various approach could be applied.

• Proceedings of the Korean Society of Computer Information Conference
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• 2014.01a
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• pp.5-8
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• 2014

This paper presents a parallel approach of formant synthesis method for haegeum on graphics processing units (GPU) using spectral modeling. Spectral modeling synthesis (SMS) is a technique that models time-varying spectra as a combination of sinusoids and a time-varying filtered noise component. A second-order digital resonator by the impulse-invariant transform (IIT) is applied to generate deterministic components and the results are band-pass filtered to adjust magnitude. The noise is calculated by first generating the sinusoids with formant synthesis, subtracting them from the original sound, and then removing some harmonics remained. The synthesized sounds are consequently by adding sinusoids, which are shown to be similar to the original Haegeum sounds. Furthermore, GPU accelerates the synthesis process enabling- real time music synthesis system development, supporting more sound effect, and multiple musical sound compositions.

• The Journal of the Acoustical Society of Korea
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• v.21 no.4
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• pp.146-146
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• 2002

We present a new technique for achieving source separation when given only a single channel recording. The main idea is based on exploiting the inherent time structure of sound sources by learning a priori sets of time-domain basis functions that encode the sources in a statistically efficient manner. We derive a learning algorithm using a maximum likelihood approach given the observed single channel data and sets of basis functions. For each time point we infer the source parameters and their contribution factors. This inference is possible due to the prior knowledge of the basis functions and the associated coefficient densities. A flexible model for density estimation allows accurate modeling of the observation, and our experimental results exhibit a high level of separation performance for simulated mixtures as well as real environment recordings employing mixtures of two different sources. We show separation results of two music signals as well as the separation of two voice signals.

• Journal of Fashion Business
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• v.14 no.6
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• pp.134-145
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• 2010

The purpose of this study is 1) to investigate the contents of fashion brand applications and what differences and 2) to scrutinize the reviews of the applications uploaded on the app store in order to suggest strategies on how to apply them to fashion. For the study, twenty-nine free applications from different categories of the fashion brands and three hundred sixty-two reviews of these applications were investigated. The analysis of the study was conducted from June 20th to November 10th of 2010. The results showed that there are four important components for fashion brand applications: conventional information (product information and store information), the purchasing function, the fun element (social networking, blogging, music etc), and the augmented reality technique. These components are formulated based on the brand's marketing strategies. In order to know whether or not these components were successfully composed, user reviews were studied, which revealed that many users were satisfied, but the applications were insufficient to meet all of their needs.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.1033-1034
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• 2012

본 논문은 제한된 대역폭의 효율적인 활용을 위한 가변 전송률 코덱을 목표로 제안된 서포트벡터머신 기반의 음성/음악 분류기의 실용도를 높이기 위한 기법을 제안한다. 서포트벡터머신 기반의 음성/음악 분류기는 높은 분류능력을 가지고 있지만 많은 계산량을 요구하기 때문에 실시간으로 사용하기에는 부적합한 면이 있다. 따라서 계층적 분류를 통해 서포트벡터머신 기반의 음성/음악 분류기의 실용성을 향상시키는 기법을 제안한다.