Kuan-Chung Chen

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As high attrition rates becomes a pressing issue of online learning and a major concern of online educators, it is important to investigate online learner motivation, including its antecedents and outcomes. Drawing on Deci and Ryan’s self-determination theory, this study proposed and tested a model for online learner motivation in two online certificate(More)
Polybrominated diphenyl ethers (PBDEs) causing thyroidal effects have been demonstrated in in vivo and in vitro studies. PBDEs with structural similarities to thyroid hormones have increased recently, but the health effects for thyroid hormones have not been well studied. The study aimed to determine PBDE levels in cord blood and further to explore(More)
Environmental estrogenic chemicals interrupt endocrine systems and generate reproductive abnormalities in wildlife, especially natural and synthetic estrogenic steroid hormones such as 17beta-estradiol (E2), estrone (E1), estriol (E3), 17alpha-ethynylestradiol (EE2), and diethylstilbestrol (DES). Concentrated animal feedlot operations (CAFOs) are of(More)
With recent advances in consumer electronics, it is noted that personalization and interactivity have become two challenging issues to further improve user experiences in watching TV. As there are thousands of TV programs broadcasted everyday, people may spend much time in finding their desirable programs. In view of this, we focus on developing a proper(More)
In this paper, a new ultra wideband circular antenna array (UCAA) combining genetic algorithm(GA) to minimize the bit error rate (BER) is proposed. The novelties of our approach is not only choosing BER as the object function instead of sidelobe level of the antenna pattern, but also consider the antenna feed length effect of each array element. The strong(More)
In this paper, we present an ARM-based hardwareassisted hypervisor, named CASL-Hypervisor, and a full system virtualization platform developed in SystemC which enables software/hardware co-simulation of virtual machine systems. CASL-Hypervisor takes advantage of an additional processor mode, extended memory management unit, configurable hardware traps and(More)
In this paper, a new ultra wideband circular antenna array (UCAA) combining genetic algorithm to minimize the bit error rate (BER) is proposed. The ultra wideband (UWB) impulse responses of the indoor channel for any transmitter-receiver location are computed by applying shooting and bouncing ray/image (SBR/Image) techniques, inverse fast Fourier transform(More)
Automobiles usually contain toxic substances, such as lubricants, acid solutions and coolants. Therefore, inappropriate handling of end-of-life vehicles (ELVs) will result in environmental pollution. ELV parts, which include metallic and non-metallic substances, are increasingly gaining recycling value due to the recent global shortage of raw materials.(More)
Undoubtedly, blogs are a significant representative in the Web 2.0 age. Every user on the Internet is able to own his or her blog space as a platform to publish personal thoughts, ideas, comments or works. Information can thus be propagated and shared in a much easier way and this has led to the development and evolution of user communities in the(More)
The problem of image retrieval is much more challenging than that of text retrieval since significant features for representing and searching an arbitrary image vary with the image content. In this work, we focus on processing images containing landmarks which are easily recognizable by human users. Our observations show that through the use of proper(More)