A Development of the Nano OS Kernel based on System State-Monitor for Ubiquitous Sensor Network

In this paper, the problems that MCU stopping and the auto-reset in sensor nodes, and the dead end transition in nano OS kernel are analyzed and confirmed. In addition to this, the solutions to tolerate the confirmed problems are also suggested and the performance of the suggested solutions was evaluated by variable experimentation. The 1^st mechanism is the stack-safe nano OS kernel suitable for USN using the nano QPlus 1.6 version that is released at present time for application program to run safely even though the stack overflow problem during program execution is occurred in sensor module. The 2^nd mechanism is the system state-monitor mechanism that recoveries the modules to normal state even though the main modules of kernel are transited to dead end or deadlock state in the nano OS.