Abstract: A disclosure is made on an apparatus which is capable of predicting and controlling the operation of a system which can realize its operation by controlling in parallel a plurality of individual processing elements. Information about the specifications for the system is input in a graphic language, and a state of control and a control sequence for each of the processing elements forming the system are originated and stored on the basis of the graphic language so that operation state diagram such as a tree structure chart for control information about the system can be processed on the above state of control and the control sequence. A transition to a state can be displayed and outputted by assigning a specific state of control, and a state in which the system can be brought to a deadlock can be detected.

Abstract: An ultrasonic image device such as may be used in a holography system or scanning system and having a piezoelectric transducer in which the conversion efficiency and phase are substantially constant over a wide frequency range. A piezoelectric sheet 5 .mu.m to 1000 .mu.m thick is used for a piezoelectric element. The piezoelectric sheet is constructed of a macromolecular material including polymers and copolymers of polar monomers. A high frequency signal input device applies to the electrodes coupled to the piezoelectric sheet high frequency signals of different frequencies in a range around a fundamental resonance of the piezoelectric sheet of .+-.10 to .+-.70% of the fundamental resonance frequency.