Wang-Rong Chang

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Wireless sensor networks make possible many new applications in a wide range of application domains. One of the primary applications of such networks is the detection and tracking of continuously moving objects, such as wild fires, biochemical materials, and so forth. This study supports such applications by developing a continuous object detection and(More)
Nowadays, vehicles have become an indispensable part of modern life. To ensure road safety and to make possible dynamic route scheduling, emergency message dissemination, traffic monitoring, and so forth, it is desirable to develop a common protocol for inter-vehicle communications (IVC) in order to realize intelligent transportation systems (ITS).(More)
The rapid evolution of networks has been driven by new advances in enabling technologies and the explosive growth of Internet traffic. optical burst switching (OBS) is not only cost-effective, but also provides high throughput, high bandwidth utilization, and low transmission latency. These benefits make OBS a viable solution for next-generation metro area(More)
WiMAX and WiFi have emerged as promising broadband access solutions for the latest generation of wireless MANs and LANs, respectively. Their complementary features enable the use of WiMAX as a backhaul service to connect multiple dispersed WiFi hotspots to the Internet. This study proposes an integrated architecture utilizing a novel WiMAX/WiFi Access Point(More)
Ethernet Passive Optical Networks (EPONs) are not only cost-effective, but also provide high throughput, high bandwidth utilization, and low transmission latency. As a result, EPONs are a viable solution for overcoming the bandwidth bottleneck problem in local access networks. This study develops a novel Dynamic Bandwidth Allocation (DBA) scheme, designated(More)
This study proposes a novel WDM EPON system based upon an AWG, in which multiple wavelengths are established in both the upstream and the downstream fibers. The use of the AWG device enables the WDM EPON architecture to support wavelength spatial reuse and allows the ONUs to communicate directly with one another rather than through the OLT. The proposed WDM(More)
Although EPONs have been proposed as a means of overcoming the bandwidth bottleneck problem in local access networks, they may not be able to meet the ever-growing bandwidth demand from users in the near future. Accordingly, this study presents what we believe to be a novel wavelength-division-multiplexing (WDM) Ethernet passive optical network (EPON)(More)
In wireless sensor networks (WSN), one of the important applications is object tracking. WSN is expected to provide the location of the detected object, and the real time location report. The sensors detecting the object need to transmit the sensing data and identification. In this paper, we propose to develop an energy efficient mobile data collector based(More)