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In this paper, we will introduce the necessity of real-time safety monitoring system for high-speed railway vehicle and propose a new type of safety monitoring system using a low-power wireless connection. To verify the proposed safety monitoring system is feasible, we measure the packet error rate on the moving train and show the analyzed results.
Recently, a lot of studies have been done in wireless sensor networks (WSNs) based on IEEE 802.15.4. While a sensor device transmits data to a PAN coordinator via a coordinator, the failure of radio communications may be occurred between a coordinator and a PAN coordinator. A coordinator may conclude that it has been orphaned and then perform the orphan… (More)
With the growth of wireless technologies rapidly, there will be coexist heterogeneous wireless LANs environment within a few years. For example, there may be coexist current wireless LAN systems based widely available 802.11 and a wireless LAN system based proprietary wireless LAN standard with different AAA mechanisms such as RADIUS and Diameter. In case… (More)
A lot of research have been done in wireless sensor networks (WSNs) based on IEEE 802.15.4. However, there is no study that the status of a device is monitored by the PAN coordinator in the IEEE 802.15.4 technology in order to reduce radio resource wastage. In this paper, we propose a procedure that the PAN coordinator can detect that the operation of a… (More)
Train accidents continuously occur due to a variety of causes (carelessness by the conductor, broken wheels, disaster during train movements, etc.). To prevent train-related accidents in advance, it is considered the monitoring train systems with wireless sensor networks (WSNs). In this paper, we propose an efficient algorithm to dynamically configure… (More)