Chia-Chi Chang

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BACKGROUND Previous studies have reported several conflicting findings regarding neuropsychiatric symptoms when comparing patients with Alzheimer's disease (AD) and patients with vascular dementia (VaD). OBJECTIVES The purpose was to: (1) compare the prevalence of neuropsychiatric symptoms among patients with AD and VaD after controlling for demographic(More)
In this paper, we design and implement a WSN testbed with a distributed architecture. It allows researchers to submit their experiments and to retrieve the results from the central server. In the testbed, we also propose a software-based hardware-supported scheme to measure the energy consumption of running sensor nodes. And we compare our(More)
Hypoxia, a common environmental condition, influences cell signals and functions. Here, we compared the effects of hypoxia (1% oxygen) and normoxia (air) on chondrogenic differentiation of human mesenchymal stem cells (MSCs). For in vitro chondrogenic differentiation, MSCs were concentrated to form pellets and subjected to conditions appropriate for(More)
A V-band fully integrated complementary push-push VCO is first presented in 0.18- /spl mu/m bulk CMOS technologies. Thin-film microstrip (TFMS) lines are utilized in the circuit to reduce the conductive substrate effect. In order to lower the phase noise, complementary cross-coupled pairs are used to generate negative conductance. The measured phase noise(More)
Chinese has become the world's strong language, and also set off a trend of learning. How to improve teaching methods and strategies to effectively help non-native speakers to overcome the language barrier is very critical. with the popularity of the internet and e-learning, learning technologies has led the learning activities and environment into a(More)
Heart rate variability (HRV) is a well-accepted indicator for neural regulatory mechanisms in cardiovascular circulation. Its spectrum analysis provides the powerful means of observing the modulation between sympathetic and parasympathetic nervous system. The timescale of HRV is limited by discrete beat-to-beat time intervals; therefore, the exploration(More)
Service failures and consequent recoveries have been identified as critical determinants of customer retention. Therefore, effective service recovery programs warrant further exploration, particularly in the online shopping environment, where consumers can receive immediate and tangible service recovery. The results of the present study suggest that by(More)
A downconversion double-balanced oscillator mixer using 0.18-mum CMOS technology is proposed in this paper. This oscillator mixer consists of an individual mixer stacked on a voltage-controlled oscillator (VCO). The stacked structure allows entire mixer current to be reused by the VCO cross-coupled pair to reduce the total current consumption of the(More)
AIMS To develop and evaluate the psychometric properties of a Chinese Feeding Difficulty Index (Ch-FDI) which assesses feeding difficulties in people with dementia (PwD). RESEARCH DESIGN AND METHOD Scale items were developed using literature review based on Model of Feeding Difficulty. Content validity was evaluated and items were modified by expert(More)