Asia University is a private university located in Wufeng District, Taichung, Taiwan. It is recognized in Taiwan for its research and teaching in health science, computer science, creative design, management, and humanities and social science. AU was ranked 83rd in 2014 THE ranking of the 100 best universities in Asia. It was also ranked 99th in the 2014 Times Higher Education ranking of the 100 best universities around the world under 50. Wikipedia.
Lu C.-T.,Asia University, Taiwan
Speech Communication | Year: 2011
The masking properties of the human ear have been successfully applied to adapt a speech enhancement system, yielding an improvement in speech quality. The accuracy of estimated speech spectra plays a major role in computing the noise masking threshold. Although traditional methods using the power-spectral-subtraction method to roughly estimate the speech spectra can provide an acceptable performance, the estimated speech spectra can be further improved for computing the noise masking threshold. In this article, we aim at finding a better spectral estimate of speech by the two-step-decision-directed method. In turn, this estimate is employed to compute the noise masking threshold of a perceptual gain factor. Experimental results show that the amounts of residual noise can be efficiently suppressed by embedding the two-step-decision-directed algorithm in the perceptual gain factor. © 2010 Elsevier B.V. All rights reserved.
Chang K.-M.,Asia University, Taiwan
Sensors | Year: 2010
A novel noise filtering algorithm based on ensemble empirical mode decomposition (EEMD) is proposed to remove artifacts in electrocardiogram (ECG) traces. Three noise patterns with different power-50 Hz, EMG, and base line wander - were embedded into simulated and real ECG signals. Traditional IIR filter, Wiener filter, empirical mode decomposition (EMD) and EEMD were used to compare filtering performance. Mean square error between clean and filtered ECGs was used as filtering performance indexes. Results showed that high noise reduction is the major advantage of the EEMD based filter, especially on arrhythmia ECGs. © 2010 by the authors.
Hsu H.-C.,Asia University, Taiwan
International Journal of Geriatric Psychiatry | Year: 2012
Purpose The goals of this study were to examine the group-based trajectories of depressive symptoms over an extended period among the older people and to identify the risk factors by gender. Methods The 18-year data used in this study came from a multiple-wave nationwide survey of older Taiwanese population. A group-based trajectory analysis method was used to identify the trajectories, and risk factors at baseline and previous depressive symptoms were used as predictors for the trajectories. Results Six trajectories were identified within the total sample, and females were more likely to be in the increasing and declining trajectories than males. When the data were divided by gender, four trajectories for males and four trajectories for females were identified: low, medium, declining, and increasing. Higher-level trajectories of depressive symptoms were related to more chronic diseases, lower physical function, lower economic satisfaction, and previous depressive symptoms for both the older men and women. Less social support and social participation were related to higher depressive symptom trajectories, particularly for men. Discussion Older females may experience more emotional fluctuation than male elderly, thus changes in psychosocial health for female elderly need to be considered by health professionals and families. Social support and social participation are protective against depressive symptoms for the higher-level trajectory groups, and older men, in particular, are more sensitive to these two social-health-related variables. Copyright © 2011 John Wiley & Sons, Ltd.
Ho Y.-S.,Asia University, Taiwan
Scientometrics | Year: 2014
This study aimed to identify and analyze characteristics of classic articles published in the Web of Science social work subject category from 1856 to 2011. Articles that have been cited at least 50 times were assessed regarding publication outputs, distribution of outputs in journals, publications of authors, institutions, countries as well as citation life cycles of articles with the highest total citations since its publication up to 2011 and the highest citations in 2011. Five bibliometric indicators were used to evaluate source countries, institutions, and authors. Results showed that 721 of the most highly referenced articles, published between 1957 and 2008, had been cited at least 50 times. Child Abuse & Neglect and American Journal of Community Psychology published the most classic articles. USA produced 89 % of classic articles and also published the most number of single, internationally collaborative, first author, and corresponding author classic articles. The top 38 productive institutions were all located in the US. The University of Illinois was the most productive institution for the total classic articles while University of California, Los Angeles produced the most inter-institutionally collaborative articles and Arizona State University published the most single institution articles. Furthermore, a new indicator, Y-index was successfully applied to evaluate publication characteristics of authors and institutions. High percentage of authors had the same numbers of first author and corresponding author status of classic articles in social work field. © 2013 Akadémiai Kiadó, Budapest, Hungary.
Chen H.-C.,Asia University, Taiwan
Journal of Network and Computer Applications | Year: 2014
Due to the proliferation of variety RFID applications supporting homeland security and defense missions, mobile devices need to store many different RFID tags to access multiple homeland defense sub-departments. Although the integration technologies of RFID systems and mobile devices have been defined and appeared in some NFC specifications. In recently years, combine the technologies of Near Field Communication (NFC) in Mobile devices can improve constraint computation capability and memory usage for Radio Frequency Identi.cations (RFID) systems. Nevertheless, currently some NFC secure key management mechanisms manage these secure multiple secret keys are needed to be very large duplicated storage space using lots of RFID tags, and they still lack the efficiency and flexibility in the management. In this paper, we first propose a multi-issued tag key agreement with time constraint, accompanying a new type of secure tag, called as a secure multi-issued tag, to deal with the problem of the management of multiple secure accesses. To achieve the requirement of near field spatial communications, each secure multi-issued tag can be authorized by distinct missions belonging to distinct group served among homeland defense sub-departments. © 2013 Elsevier Ltd. All rights reserved.