摘要:
A distributed computing system having a plurality of computers different from each other in performance, load, and type, uniformly manages local priority schemes adapted in the respective computers by utilizing the concept of “urgency” or “time limit”. Each of the computers includes a priority level conversion procedure for performing a conversion between an urgency level and a priority level of processing in accordance with the performance and the load of the computer, and a priority level changing procedure for changing a priority level of a program, which executes the processing, in accordance with a priority level indicated by the priority level conversion procedure.
摘要:
An inter-OS control software for switching OS's in operation executed on a single CPU is installed, and plural OS's are made alternately executed. A control program is executed exclusively on one OS, which controls the controlled apparatus. A supervisory control program and a development environment program are executed on another OS, and a memory space is divided so as to make no effect for the operation of the control program. A higher real-time performance and reliability can be established with a single CPU architecture.
摘要:
A computer system is provided with a scheme to making the input and output device provided in a computer in common for a plurality of operating system, in a multiple operating system control unit operating a plurality of mutually distinct operating systems on one computer system. The computer system includes a plurality of operating systems, and OS switching unit for switching a plurality of operating systems. The OS switching means makes reference to a preferential interrupt table on the basis of an interrupt factor for switching to corresponding operating system and calls interrupt processing means incorporated in the operating system.
摘要:
A distributed computing system --,--; having a plurality of computers that differ from each other in terms of performance, load, and type, uniformly manages local priority schemes adapted in the respective computers by utilizing the concept of “urgency” or “time limit”. Each of the computers includes a priority level conversion procedure for performing a conversion between an urgency level and a priority level of processing in accordance with the performance and the load of the computer, and a priority level changing procedure for changing a priority level of a program, which executes the processing, in accordance with a priority level indicated by the priority level conversion procedure.
摘要:
After application of power or insertion of a medium, a frequency bandpass digital filter extracts the first-order component, which has one period per revolution of the medium, and the second-order component, which has two periods per revolution of the medium, from the carriage operation amount for one revolution of the medium, this being written into a carriage operation amount compensation table. Then, a position error averaging section calculates the average value of a tracking error signal, and a compensation table updating judgment section monitors this position error average value. If the position error average exceeds a prescribed threshold value for a number of consecutive sectors, the second-order component only is updated in the carriage operation amount compensation table. An actuator driving section controls the carriage in accordance with a corrected operation amount obtained by adding the operation amount obtained at the carriage operation amount calculation section and the compensation amount of the carriage compensation table. The results in stable position control of the head, without the influence of ambient temperature changes on the off-track amount.
摘要:
A computer system and method for enabling memory expansion without shutting off the computer system are disclosed. The computer system has a dual memory configuration and supports memory insertion and extraction while being on-line. The memory content of one system may be copied to the memory of another system according to a predetermined priority or after a predetermined delay. Memory may be used efficiently during the insertion or extraction by securing a status management table expansion area in an expanded portion of memory. Memory may be expanded in computer systems that do not have an open memory slot by replacing the installed memory with a memory having a larger capacity.
摘要:
A main memory managing arrangement involves allotting a request program to one of three distinct areas of main memory by looking in an area managing table which stores head addresses and the capacities of the respective areas. The areas allocated in main memory correspond to a single OS area, a single first class program area and a single second class program area. An empty page managing table is also provided for indicating the presence or absence of an empty area conformable to a request in an allocated area. A request program is allocated to the allocated area when the presence of the empty area of required capacity is determined. The memory capacity for a resident program can be assured independently of the memory capacities for other programs to enhance reliability conformable to real-time process computers.
摘要:
A stress-detecting element includes a support body, a support film, a first piezoelectric element, first and second elastic parts. The support body has an opening part with first and second rectilinear sections extending parallel to each other. The support film blocks off the opening part. The first piezoelectric element straddles the first rectilinear section from an interior area to an exterior area of the opening part as seen in plan view. The first elastic part straddles the first rectilinear section from the interior area to the exterior area of the opening part. The second elastic part straddles the second rectilinear section from the interior area to the exterior area of the opening part. The first and second elastic parts respectively have first and second elastic end sections disposed in the interior area of the opening part and spaced apart from each other.
摘要:
An ultrasonic transducer includes a resin substrate, a support film and a piezoelectric element. The resin substrate has an opening. The support film blocks off the opening in the resin substrate. The piezoelectric element is disposed on the support film in a region that blocks off the opening in plan view from a thickness direction of the support film. The piezoelectric element includes a lamination of a lower electrode, a piezoelectric body, and an upper electrode.
摘要:
An ultrasonic transducer includes: a support member having an opening section; a diaphragm adapted to cover the opening section; and a piezoelectric member provided to the diaphragm and at least one of expanding and contracting in an in-plane direction in response to application of a voltage, wherein the diaphragm has a concave groove section formed to have a concave shape on a surface on an opposite side to one side exposed to the opening section, and the piezoelectric member is fixed to the diaphragm in an area outside the concave groove section, and disposed to cover the concave groove section so as to be opposed to a bottom of the concave groove section via a space.