• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.119-122
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• 1999

In stereo acoustic echo canceller scheme, adaptive filters coefficients converge very slowly or misconverge to real acoustic echo path in receiving room. This is due to cross-correlation between channel signals. In this paper, new preprocessor using absolute difference factor between stereo signals is proposed to reduce cross-correlation between signals. Computer simulations demonstrate that this preprocessor perform well to the half wave rectifier which has simple and good performance of the several preprocessors in recent papers. When the paths in transmitting room change, performance does not degrade in proposed preprocessor.

• Phonetics and Speech Sciences
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• v.8 no.4
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• pp.123-129
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• 2016

This study investigates the relationship between dysphonia severity index(DSI) and voice handicap index(VHI). Seventeen patients with a vocal nodule and twenty patients with laryngopharyngeal reflux(LPR) patients participated in this study. Results showed that there is no significant difference in either DSI or VHI between vocal nodule and LPR patients, with a weak negative correlation between DSI and VHI. Results also showed that there is significant difference only in both MPT and Fhi of all DSI parameters between vocal nodule and LPR patients. These results suggest that voice evaluation should be conducted both objectively in terms of acoustical and aerodynamic parameters and subjectively in terms of GRBAS and VHI.

• Korean Journal of Occupational Health Nursing
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• v.20 no.2
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• pp.221-229
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• 2011

Purpose: The purpose of this study was to identify the relationship between family stress and health promoting behavior (HPB) of the dual earner couples. Methods: The subjects were 312 dual earner couples selected from G city by convenient sampling. The data were collected from October 1 to November 10, 2009, and analyzed using frequencies, t-test, ANOVA, Duncan test, and Pearson's correlation coefficient with the SPSS/WIN 17.0. Results: The mean score of family stress and HPB on the subjects were 2.98 and 3.29 respectively. Family stress showed a significant difference according to monthly income. HPB showed a significant difference according to exercise, smoking, and drinking. HPB had a significantly positive correlation with family stress. Conclusion: This study suggested that we should develop programs to increase regular exercise and to quit drinking and smoking for the dual earner couples in occupational health nursing.

• MALSORI
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• no.53
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• pp.157-169
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• 2005

This paper proposes an efficiently representing method of spatial cues on multichannel spatial audio coding. The Binaural Cue Coding (BCC) method introduced recently represents multichannel audio signals by means of Inter Channel Level Difference (ICLD) or Source Index (SI). We tried to express more efficiently ICLD and SI information based on Inter Channel Correlation in this paper. We adopt different spatial cues according to ICC and propose a compensation method of empty spectrums created by using SI. We performed a MOS test and measuring spectral distortion. The results show that the proposed method can reduce the bitrate of side information without large degradation of the audio quality.

• Journal of Institute of Control, Robotics and Systems
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• v.17 no.12
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• pp.1194-1202
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• 2011

A touch panel system has been one of the most widely used input devices. In this study, a touch panel embedded system using accelerometers is considered in order to make commercial white-boards or plates into touch panels. Three accelerometers are located at different positions on such a white board, so that touch points on the board can be identified using the sensors. For the identification of touch points, a TDOA (Time Difference of Arrivals) technique is applied in the algorithm which was implemented in a DSP board (TI 6713 DSK), which can provide a precise touch location by using the cross-correlation function of measured signals from the three accelerometers. Experiment results show that the touch panel system with accelerometers could provide the exact touch location. Thus a novel approach using such accelerometers could be applied to a new touch panel system.

• Journal of the Korean Home Economics Association
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• v.40 no.5
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• pp.225-235
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• 2002

The purpose of this research is to delineate the effect of maternal variables of the verbal abuse. Such variables as the mother's age, her education level, and maternal parenting stress have been chosen for the analysis. The sample subject were 659 pairs of fifth/sixth grade of elementary school and firs/second grade of middle school, and their mothers. The major findings of the research are as follows: first, looking at the correlation between the mother's age/education level and the verbal abuse, the verbal abuse factor shows difference correlating to the mother's age/education level. Second, looking at the correlation between the material parenting stress level and the verbal abuse, the verbal abuse factor shows difference correlating to the maternal parenting stress level. Third, the result of multiple regression analysis on the effects of the maternal variables to the verbal abuse indicates that material parenting stress is the significant contributing factor. All in all, the maternal variables account for 9% of the verbal abuse score.

• Journal of Astronomy and Space Sciences
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• v.2 no.2
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• pp.117-129
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• 1985

Holmberg's diameters of galaxies $D_{h}$ were obtained from Holmberg catalogue. The difference between Holmberg's diameter and de Vaucouleurs' face-on diameter is campared with the results of Heidmann et al. The difference obtained in this paper is smaller than that of Heidmann at al. Also, the correlation between $D_{h}$ and $D_{v}$ was obtained for each type in de Vaucouleurs' classification of galaxies. It shows that $D_{h}$ is overestimated that $D_{v}$.

• Journal of Korean Society for Atmospheric Environment
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• v.22 no.E1
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• pp.1-8
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• 2006

The purpose of this study was to evaluate the efficiency of a passive sampler in measuring atmospheric ammonia concentrations using chamber system. The ability of the passive sampler to quantitatively determine atmospheric ammonia gas was almost identical to that of the reference method (indophenol method). There was no significant difference between concentrations measured by the two methods. The detection and quantification limits of the ammonia passive sampler were 16.9 ppb and 25.3 ppb, respectively, for a 24-h sampling period. The average coefficient of variation between replicated samplers was $6.7{\pm}4.2%$. The concentrations measured by the two methods (passive sampler and indophenol method) were no significant difference with good a correlation (correlation coefficient=0.964).

• Proceedings of the Korean Institute of Building Construction Conference
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• 2016.05a
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• pp.249-250
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• 2016

Korean government has announced declared prices of apartment reflecting market condition each year. Therefore, on that basis, apartment owners have used as basic data trading apartments and the government has been used to calculate the tax. However, the sales prices and declared prices of apartment has occurred difference depending on the region and the brand. This study has analyzed and compared regional differences in sales price of apartments. The results of this study, we have known that sales price of apartments was a big difference depending on the region and the gross area. Especially, Seoul and Gyeonggi Province are the highest. And sales price of Southeast and urban area are the highest in Seoul. In the future, it is necessary that gap analysis between sales price and declared prices of apartment. And It is needed to develop apartment index considering the region and the gross area.

• Journal of Communications and Networks
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• v.15 no.3
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• pp.245-251
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• 2013

This paper addresses the issue of time-difference-of-arrival (TDOA) estimation for complex noncircular signals. First, under the wide-sense stationary assumption, we derive the maximum likelihood (ML) estimator and the Cramer-Rao lower bound for Gaussian noncircular signals in Gaussian circular noise. The ML estimator uses the second-order statistics information of a noncircular signal more comprehensively when compared with the cross-correlation (CC) and the conjugate CC estimators. Further, we present a scheme to modify the traditional signal-selective TDOA methods for noncircular signals on the basis of the cyclostationarity of man-made signals. This scheme simultaneously exploits the information contained in both the cyclic cross-correlation (CCC) and the conjugate CCC of a noncircular signal.