Virtual device

Abstract: We designed a virtual device for a local area network observing, operating and connecting devices to a personal computer. To keep the widest field of application, we proceeded by using abstraction and specification rules of software engineering in the design and implementation of the hardware and software for the Infusion Monitor. We specially built a box of hardware to interface multiple medical instruments with different communication protocols to a PC via a single serial port. We called that box the Universal Device Communication Controller (UDCC). The use of the virtual device driver is illustrated by the Infusion Monitor implemented for the anaesthesia and intensive care workstation.

Abstract: PURPOSE:To input and output data to plural display areas almost without using any control data by determining the attribute of a display area on a display screen before input/output operation and switching input/output destinations on the basis of the attribute and the kind of data as keys CONSTITUTION:One composite virtual device include all display areas determined for an actual terminal device and when data are inputted to and outputted from the composite virtual terminal device, device, a character display area C1, graph display areas G1 and G2, and image display areas I1, I2, and I3 are determined distinctively; on the display screen of a CRT terminal device corresponding to single virtual terminal devices CT1, GT1, and IT1 to determine the composite virtual terminal vice VT1 consisting of CT1, GT1, and IT1 Then, inputs to and outputs from the composite virtual terminal device VT1 are inputs to and outputs from the single virtual terminals CT1, GT1, and IT1 according to the kinds of the inputs and outputs, ie a character, a graph, and an image format Further, when a display line overflow on a display screen occurs during the input/output operation of a signal virtual terminal, a return to the head of the display area or movement to another display area is made

Abstract: A recording apparatus includes a server, a client, a virtual device, a judgment section, and a regeneration section. The server executes an access to a storage medium as a service. The client includes processes that require the service. The virtual device is used to perform communication between the server and the client using a socket. The judgment section judges, when a process of the client opens the virtual device, whether the virtual device is already opened. The regeneration section regenerates, when the virtual device is already opened, a file descriptor for the process that references the socket based on an existing kernel file table.

Abstract: The invention relates to a hybrid simulation test platform for an integrated electric power system of an electric propulsion ship A VM (virtual machine) sets up a mathematical model for each virtual device in the ship integrated electric power system to output voltage signals, the signals are processed by a signal conversion device and converted into voltage or current signals to connect with an object electric energy acquisition and processing device, and an output of the signal conversion device is connected with an object synchronizing device and an object integrated protection device at the same time The object electric energy acquisition and processing device, the object synchronizing device and the object integrated protection device are in data exchange with an object energy management system and an object propelling control system The object energy management system and the object propelling control system output control signals to the VM to control the virtual devices of the power electric system By adoption of the virtual devices for generating voltage and current to replace voltage and current generated by practical devices, test cost and risks can be reduced; high system expansibility is achieved; system parameters are arbitrarily adjustable; verification of novel techniques and novel equipment can be realized