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operating system for man-machine interacti operating system A-RMS which is applicable for a wide operating system, the simultaneous operation was realized. range of applications, from small embedded systems t o large Cl 1 c21 C3l c41 process control systems with man-machine interactive processing. In this operating system man-machine 2. FEATU RES interactive processing, with t h e help of a high performance command interpreter, can be executed simultaneously with * Simultaneous support of realtime control environment and realtime control operations. In consideration of a possible influence on t h e control side, the operating environments* High r e l i a b i l i t y by means of t h e separation of operating f o r control and f o r interactive processing have been environment of realtime control and man-machine This paper introduces t h e newly developed realtime environment, and using this on top of a native realtime The new operating system has t h e following features: multi-user TSS environment. basically separated. But, communication path is provided through t h e files and by certain system calls. 1. PREFACE To date, realtime operating systems have been developed with the close relation t o t h e areas of process control and machine control. While t h e application systems of these are a s become refined and complex, t h e requirements f o r operating systems became sophisticated and of variety. interactive processing. * Modular structure with easy attachment/detachment of function modules by means of server definition functions. * High-speed realtime kernel. * F i l e system with hierarchically structured directories * User friendly system with command control * Written i n high level language C. for program deve language.and process data processing.Requirements are now being made t h a t realtime operating systems include, in addition t o t h e conventional control 3. SYSTEM STRUCTURE functions, information processing functions such asIn order t o allow reconfiguration of the operating realtime processing and storage of gathered process data system according to t h e requirement of application system, and functions for program development i n realtime this operating system has been designed a s a two layered environment. Now, by virtue of the high performance 16 b i t and 32 b i t microcomputers, t h e realization of above mentioned requirements become possible.Under these 3.1 Two layered modular structure conditions, the realtime operating system "A-RMS", which is Generally, structure of operating systems can be applicable for range of applications i n various control divided i n t o the following two types. systems, from small embedded systems t o large systems with man-machine interactive processing using high performance command interpreters, has been developed.Realtime Realtime Command (i) simultaneous operation of realtime control function and man-machine interactive processing function, and (ii) modular structure.These features w i l l be described in d e t a i l i n t h e following sections of this...

A new concept called "Sensor Network" has been proposed with the development of mobile communications system such as cellular phone, radio LAN and Bluetooth. Signals from many sensor nodes spread in a wide area are gathered to a center node by technology similar to that used in mobile communications. Sensor network enables home/office circumstance control, environment monitoring and protection based on the collected data. We proposed a novel ultrasonic positioning method which can be installed in sensor network. This method has also been investigated to be combined with 2.4-GHz ZigBee, which has been regulated by IEEE 802.15.4 as wireless-communications medium for sensor network.