• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.5
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• pp.807-812
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• 2020

This paper proposes a blind speech source separation algorithm using a microphone to separate only the target speech source signal in an environment in which various speech source signals are mixed. The proposed algorithm is a model of frequency domain representation based on independent component analysis method. Accordingly, for the purpose of verifying the validity of independent component analysis in the frequency domain for two speech sources, the proposed algorithm is executed by changing the type of speech sources to perform speech sources separation to verify the improvement effect. It was clarified from the experimental results by the waveform of this experiment that the two-channel speech source signals can be clearly separated compared to the original waveform. In addition, in this experiments, the proposed algorithm improves the speech source separation performance compared to the existing algorithms, from the experimental results using the target signal to interference energy ratio.

• Journal of the Korean Institute of Intelligent Systems
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• v.15 no.3
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• pp.294-299
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• 2005

This paper presents the separation performance of the linearly mixed image signals with additive noises by using an independent component analyses(ICAs) of the fixed-point(FP) algorithm based on Newton and secant method, respectively. The Newton's FP-ICA uses the slope of objective function, and the secant's FP-ICA also uses the tangent line of objective function. The 2 kinds of ICA have been applied to the 2 dimensional 2-image with $512\times512$ pixels. Then Gaussian noise and Laplacian noise are added to the mixed images, respectively. The experimental results show that the Newton's FP-ICA has better the separation speed than secant FP-ICA and the secant's FP-ICA has also the better separation rate than Newton's FP-ICA. Especially, the Newton and secant method gives relatively larger improvement degree in separation speed and rate as the noise increases.

• Journal of Convergence for Information Technology
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• v.11 no.1
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• pp.91-101
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• 2021

The purpose of this study is to understand the performance of the initial adaptation support program for people with mental illness living in independent housing. The group of people with mental illness living in independent housing from T mental rehabilitation facilities in Seoul were assigned to the experimental group, and the other group of people with mental illness in living facilities and group home were assigned to the control group. After that, the degree of community performance between groups was compared with pre-post tests. As a result of the study, the pre-post analysis of the total social support of the experimental group showed significant differences. Also, the results were statistically insignificant in all of the control groups, so the initial adaptation support program was found effective in improving the total social support of the independent housing group. Based on the results of this study, the direction of housing support and establishment of a performance system for housing services for stable settlement of discharged people with mental illness into the community was suggested.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.106-106
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• 2012

본 연구에서는 독립 호우사상을 이용하여 이변량 빈도해석 및 유출해석을 수행하고, 이로부터 산정된 설계홍수량을 기존 단변량 빈도해석 결과와 비교하였다. 추가로 빈도해석 결과를 유출모형에 적용하기 위한 강우의 시간분포 모형으로 교호블록 방법 및 Huff 방법을 이용하여 그 특성이 비교될 수 있도록 하였다. 본 연구에서 고려한 빈도해석 결과로부터 산정된 설계홍수량을 비교하기 위해 Clark 모형을 유출모형으로 이용하였으며, 유효우량을 산정하기 위한 방법으로 SCS 방법을 동일하게 적용하였다. 이러한 특성은 유역 크기가 다른 세 유역(중랑천, 청계천, 우이천)에 적용한 결과로부터 비교될 수 있도록 하였다. 그 결과를 정리하면 다음과 같다. 첫째, 연 최대치 독립 호우사상에 대한 이변량 빈도해석 결과, 지속기간이 짧은 경우에는 단변량 빈도해석 결과와의 차이가 매우 크나 지속기간이 길어짊에 따라서 그 차이가 현저히 줄어드는 것으로 나타났다. 아울러 지속기간이 짧은 경우, 단변량 빈도해석 결과가 이변량 빈도해석 결과보다 더욱 크게 나타났으나 특정 지속기간 이상부터는 그 결과가 역전되어 나타났다. 둘째, 강우 시간분포 모형으로 교호블록 방법을 적용하는 경우가 Huff 방법을 적용한 경우보다 더욱 큰 첨두유출량을 발생시키는 것으로 나타났다. 아울러 교호블록 방법을 적용하는 경우에는 강우 지속기간의 증가에 따라서 첨두 유출량이 점차 증가하는 것으로 나타났으나, 강우 지속기간이 대략 24시간 정도 되었을 때 그 값이 거의 수렴하는 것으로 나타났다. 셋째, 중랑천 유역에 대해 Huff 방법을 적용하여 유출해석을 수행한 결과에서는 이변량 설계강우를 적용한 경우가 단변량 설계강우를 적용한 경우보다 더욱 큰 홍수량을 발생시키는 것으로 나타났다. 반면에 청계천 및 우이천 유역의 경우에는 이변량 설계 강우를 적용한 경우보다 단변량 설계강우를 적용한 경우의 홍수량이 다소 큰 것으로 나타났다. 넷째, 교호블록 방법을 적용하여 유출해석을 수행한 경우, 본 연구에서 고려한 모든 유역에 대해 이변량 설계강우를 적용한 경우가 단변량 설계강우를 적용한 경우보다 더 큰 홍수량을 발생시키는 것으로 나타났다.

• Journal of Korea Water Resources Association
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• v.45 no.5
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• pp.431-444
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• 2012

This study investigated the differences between annual maximum series and annual maximum independent rainfall event series with relatively short and long rainfall durations. Annual maximum independent rainfall events were selected by applying various IETDs and thresholds to the hourly rainfall data in Seoul for the duration from 1961 to 2010. Annual maximum independent rainfall event series decided were then compared with the conventional annual maximum series. Summarizing the results is as follows. First, the effect of IETD and threshold was not beyond the expected level. For example, as the IETD increases, the frequencies of independent rainfall events decreased similarly in their rate for both with short and long durations. However, as the threshold increases, the frequency of those with rather long durations decreased much higher. Second, The mean rainfall intensity of the independent rainfall events was found to remain constant regardless of their duration. This indicates that the annual maximum rainfall intensity could be found in a rainfall event with longer durations. Lastly, the difference between the annual maximum rainfall series and the annual maximum independent rainfall event series with rather short rainfall durations was found significantly large, which decreases with longer durations. This result indicates that the conventional data analysis method, especially for small basins with short concentration time, could lead an unrealistic design rainfall with little possibility of occurrence.

• Korean Business Review
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• v.4
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• pp.105-121
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• 1991

• Proceedings of the Korean Statistical Society Conference
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• 2003.10a
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• pp.239-244
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• 2003

본 연구에서는 확률모형의 모수로부터 얻어지는 여러형태의 함수간의 크기를 다중비교 하는 방법을 제안하고자 한다. 이 방법은 비교대상인 모수 함수간의 선호확률을 베이지안 방법으로 추정하고, 이들로부터 얻어지는 선호행렬을 이용한 새로운 다중비교법이다. 이러한 방법의 제안에 필요한 이론과 비교기준을 고안하였으며, 응용 예로, 제안된 방법을 s개의 독립인 지수분포 모수의 기하평균 크기비교에 적용하였다.

• Korean Journal of Health Education and Promotion
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• v.4 no.2
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• pp.95-135
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• 1987

According to U.S. Bureau of Census (1984), the number of older adults (over the age of sixty) has grown twice as fast as the rest of the population over the past twenty-five years. It is predicted that between 1980 and 2020, their number will double again, In 1985, National Bureau of Statistics, Economic Planning Board, Republic of Korea reported that the number of older adults over 60 years of age was 2.7 million (6.7% of the total population). It is projected that their number will become 3.9 million (8% of the total population) by the year 2000.

• Journal of the Korea Convergence Society
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• v.11 no.12
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• pp.451-456
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• 2020

This study compared the utility of walking aids, and activities of daily life depending on the ability of people with mobility disabilities to use walking aids. Data were extracted from the Korea Welfare Panel Study in 2014. Data of 435,947 individuals were analyzed using chi-square and t-tests. The findings from this study showed that disabled persons who cannot use walking aids independently were more likely to have a severe disability level and a lower level of daily activities than the independent group. The level of social participation and leisure activities were also significantly lower in the dependent than the independent group. Therefore, walking aids should be tailored for individuals depending on their level of independence for using walking aids.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.3
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• pp.1319-1324
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• 2012

Tomatoes were harvested at different ripening stages. To determine the ripening stages, We analyzed the relation between the compound concentrations of tomato measured with HPLC and the tomato RGB images. Among the compound concentrations, tomato quality is mostly affected by the Lycopene. The $Q^2$ error of the predicted Lycopene concentration and the corresponding independent component of tomato RGB image, determined from the PLS procedure, was 0.92. and we show the effectiveness of the independent component by comparing the error between the pixel area of RGB image applied by independent component and the simple black white tomato image. This regression made it possible to construct concentration images of the tomatoes, which showed non-uniform ripening. The method can be applied in an unsupervised real time sorting machine of unripe and discolored tomato using the compound concentrations.