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SUMMARYIn order to accomplish two-dimensional device simulation with a large number of nodes, in this paper we propose the device-partition method (DPM) to resolve the problem that the memory size of the simulation environment is insufficient. The idea of DPM is that the device can be divided into several parts and a matrix solver only solves one part at a time. DPM uses the iteration method to simulate the device. By continuous iteration, an accurate solution can be obtained. Hence, we use DPM to demonstrate the simulations of the MOSFET and the CMOS inverter. The simulation results of DPM and the coupled method (CM) are nearly approximate and correspond with the theory. Hence, DPM is a suitable method to develop a powerful simulation environment.

SUMMARYIn this paper, we study the decoupled method which requires less memory on semiconductor device simulation. The decoupled method decouples the three equivalent circuits of semiconductor and solves them sequentially. The three equivalent circuits are formed by formulating the three partial differential equations that describe the electrical behaviour of semiconductor. Since the decoupled method solves one equation in each stage, the decoupled method uses one-ninth memory space of the coupled method. When decoupling the three equivalent circuits, the decoupled method yields a boundary condition limitation. In order to overcome the limitation, we propose a compromising partial decoupled method which has complete boundary condition and requires four-ninth memory space of the coupled method. The three methods are compared for computational efficiency and accuracy in the simulation of BJT. The simulation results are identical.

The active stokehold protective garments (ASPG) can remove body heat of ship stokehold operators working in confined and extremely hot environment via conductive heat exchange from circulating water-cooled fluid next to the skin through the body-temperature-monitoring method. Hence, portable microclimate water-cooled thermoregulation systems (MWCTS) for the ASPG have been developed by using programmable embedded system-on-chip (PSoC) in this paper. The ASPG have advantages of longer cooling periods, better temperature-controlled capability, and excellent thermal somatosensory comfort. Furthermore, they could allow users to adjust comfortable temperature and also maintain long-term constant temperature by monitoring human temperature in portable MWCTS. Additionally, optimal control algorithm may enhance system efficiency to reduce the power consumption and extend the operating time effectively; thus, the velocity and temperature closed-loop control systems have also been improved in the portable MWCTS for the ASPG. Consequently, several experiments have been implemented and explored the impact of the heat transfer rate and verified the feasibility of the MWCTS for ASPF.