Jiun-jian Liaw

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Wireless networks and the voice over Internet protocol (VoIP) have recently been widely adapted. VoIP services over Ad-hoc network can be accomplished by middleware embedded in mobile devices. In this study, we have implemented an intelligent VoIP system with embedded pseudo session initiation protocol (SIP) server in an Ad-hoc network. We employed the(More)
Many industrial wireless sensor networks deploy the IEEE 802.15.4-2015 standard with low power consumption and the Internet networking capabilities. The time-slotted channel hopping (TSCH) is an amendment to the medium access control protocol defined by the IEEE 802.15.4 standard. Furthermore, the Internet engineering task force (IETF) defines an(More)
The texture of the surface of individual fiber is an important characteristic. The fibers can be classified and recognized using the surface texture by a specific parameter. To describe the texture, the fractal parameter (or Hurst coefficient) is a proper value. In this study, we use the Fractional Brownian Motion (FBM) to model the texture of the fiber(More)
Diesel soot aggregates emitted from a model dynamometer and 11 on-road vehicles were segregated by a micro-orifice uniform deposit impactor (MOUDI). The elemental contents and morphological parameters of the aggregates were then examined by scanning electron microscopy coupled with an energy dispersive spectrometer (SEM-EDS), and combined with a fractional(More)
In today's society, smartphone have become part of our lives. With regard to these small devices, the function of an accelerometer sensor has been installed as essential. Therefore, it is utilized by the public to recognize humans' action state. Among these different actions, there is a difference existing in the accelerometer value, so as to raise the nine(More)
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