• 한국음향학회지
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• 제20권8호
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• pp.81-87
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• 2001

The human auditory system is appropriate for the "constant Q"system. The STFT (Short Time Fourier Transform) is not suitable for the auditory perception model since it has constant bandwidth. In this paper, the CWT (continuous wavelet transform) is employed for the auditory filter model. In the CWT, the frequency resolution can be adjusted for auditory sensation models. The proposed CWT is applied to the modeling of the JNVF. In addition, other signal processing methods such as STFT, VER-FFT and VFR-STFT are discussed. Among these methods, the model of JNVF (Just Noticeable Variation in Frequency) by using the CWT fits in with the JNVF of auditory model although it requires quite a long time.

• 디지털융복합연구
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• 제17권7호
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• pp.207-214
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• 2019

본 연구는 SimPad를 이용한 현장중심형 심폐소생술과 영상자가학습 심폐소생술의 질을 비교 분석하여 효과적인 심폐소생술 교육방법을 모색하고, 심폐소생술 교육의 기초자료로 제공하고자 시행하였다. 연구의 대상자 및 자료수집은 G광역시에 위치해 있는 G대학교의 심폐소생술 강의를 이수한 응급구조과 1학년 64명을 대상으로 2018년 11월 14일부터 2018년 12월 5일까지 시행하였으며, SPSS ver. 23.0을 이용하여 분석하였다. 연구결과, 현장중심형 심폐소생술이 영상자가학습 심폐소생술보다 CPR 총 점수, 압박점수, 압박깊이, 가슴압박율, 압박속도, 인공호흡점수, 총 호흡수 영역에서 심폐소생술 질이 더 높게 나타났다. 따라서 현장중심형 심폐소생술을 이용하여 교육법이 기존의 영상자가학습 심폐소생술 교육법보다 심폐소생술 질을 향상시키는 것으로 파악할 수 있었으며 향후 심폐소생술 교육의 기초자료로 활용할 수 있을 것으로 사료된다.

• 한국의류산업학회지
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• 제15권4호
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• pp.620-629
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• 2013

This study examines the rustling sound characteristics of electrospun nanofiber web laminates according to layer structures. This study assesses mechanical properties and frictional sounds (such as SPL); in addition, Zwicker's psychoacoustic parameters (such as Loudness (Z), Sharpness (Z), Roughness (Z), and Fluctuation strength (Z)) were calculated using the Sound Quality Program (ver.3.2, B&K, Denmark). The result determined how to control these characteristics and minimize rustling sounds. A total of 3 specimens' frictional sound (generated at 0.63 m/s) was recorded using a Simulator for Frictional Sound of Fabrics (Korea Patent No. 10-2008-0105524) and SPLs were analyzed with a Fast Fourier Transformation (FFT). The mechanical properties of fabrics were measured with a KES-FB system. The SPL value of the sound spectrum showed 6.84~58.47dB at 0~17,500Hz. The SPL value was 61.2dB for the 2-layer PU nanofiber web laminates layered on densely woven PET(C1) and was the highest at 65.1dB for the 3-layer PU nanofiber web laminates (C3). Based on SPSS 18.0, it was shown that there is a correlation between mechanical properties and psychoacoustic characteristics. Tensile properties (LT), weight (T), and bending properties (2HB) showed a high correlation with psychoacoustic characteristics. Tensile linearity (LT) with Loudness (Z) showed a negative correlation coefficient; however, weight (T) with Sharpness (Z) and Roughness (Z), and bending hysteresis (2HB) with Roughness (Z) indicated positive correlation coefficients, respectively.