Patent application number | Description | Published |
20100180279 | FIELD CONTROL DEVICE AND FIELD CONTROL METHOD - A field control device is provided. The field control device includes: a task executing unit configured to selectively and sequentially execute a control task relating to a field control and other tasks in a same control period; and a priority switching unit configured to switch a relative priority of the control task relative to the other tasks in the control period, wherein the priority is a priority of an execution sequence of tasks in the task executing unit. The priority switching unit is configured to: i) set the priority higher than a certain priority, before the control task is started; and ii) set the priority lower than the certain priority, after the control task is ended. | 07-15-2010 |
20100198363 | DISTRIBUTED CONTROL SYSTEM - There is provided a distributed control system including a plurality of field controllers which are connected through a control network. Each of the field controllers includes: a control clock that defines a control timing of the field controller; and an adjustment unit that adjusts a control time of the control clock depending on a network time obtained through the control network. | 08-05-2010 |
20100198991 | DUPLEXED FIELD CONTROLLER - There is provided a duplexed field controller. The duplexed field controller includes: first and second control units between which a control authority is switchable; a first application clock that is updated based on a reference clock so as to define a timing of an application operation of the first control unit; a second application clock that is updated based on the reference clock so as to define a timing of an application operation of the second control unit; and an update control unit that bypasses the first update of the second application clock after switching of the control authority, if the first application clock is ahead of the second application clock when the control authority is switched from the first control unit to the second control unit. | 08-05-2010 |
20100199003 | FIELD CONTROL SYSTEM - The field control system includes: a field device; a field controller which is connected to a control network and which executes a computation processing for controlling the field device according to a given control cycle while executing a data communication between the field controller and the field device, the field controller including a communication unit configured to execute the data communication with the field device, and a control computation unit configured to execute the computation processing independently from the communication unit; and an operation monitor which is connected to the control network and which operates and monitors the field device, the operation monitor including a network clock which provides a common network time to the control network. The control computation unit and the communication unit execute the computation processing and the data communication in synchronism with each other in accordance with a timer clock based on the network time. | 08-05-2010 |
20100297949 | RADIO TRANSMISSION DEVICE, METHOD FOR DETERMINING MODULATION SYSTEM, AND RECORDING MEDIUM THEREFOR - A problem that a loss of signal occurs due to switching of a modulation scheme using an adaptive modulation scheme is solved. A radio transmission device ( | 11-25-2010 |
20110022027 | DRUG-ELUTING CATHETER AND METHOD OF MANUFACTURING THE SAME - Biocompatible nanoparticles | 01-27-2011 |
20110244813 | COMMUNICATION SYSTEM - This communication system is equipped with a plurality of transceiver devices each composed of a transmission device that transmits unit data and a reception device that receives unit data from the transmission device. The transmission devices are connected in series. Each of the transmission devices stores identification information for identifying the device itself. The transmission device accepts unit data from a front stage side. The transmission device generates identification information for identifying one of the transmission devices from information included in the accepted unit data, in accordance with a predetermined generation process. In a case that the generated identification information corresponds to the stored identification information, the transmission device transmits the accepted unit data to the reception device. In a case that the generated identification information does not correspond to the stored identification information, the transmission device sends the accepted unit data to a back stage side. | 10-06-2011 |
20120020289 | WIRELESS TRANSMISSION METHOD AND WIRELESS TRANSMISSION DEVICE - An external signal is received by the first wireless transmission device of one wireless transmission device group, and then is divided. One divided signal is transmitted to the first wireless transmission device of the other wireless transmission device group opposite to the one wireless transmission device group, and the other divided signal is transmitted to the second wireless transmission device of the one wireless transmission device group. In the same manner, in the second, third, . . . , wireless transmission devices of the one wireless transmission device group, an input signal is divided into two signals, and the divided signals are each transmitted to the opposing wireless transmission device of the other wireless transmission device group and to the adjacent wireless transmission device of the one wireless transmission device group. The wireless transmission devices of the other wireless transmission device group each extracts a signal from the wireless signal transmitted from the opposing wireless transmission device of the one wireless transmission device group, and transmits the signal to the preceding adjacent wireless transmission device of the other wireless transmission device group. The first wireless transmission devices of the other wireless transmission device group combines a signal extracted from the wireless signal transmitted from the first wireless transmission device of the one wireless transmission device group and a signal transmitted from the second wireless transmission device of the other wireless transmission device group together, and outputs the combined signal to the outside. | 01-26-2012 |
20120093171 | DATA TRANSFER DEVICE - A data transfer device | 04-19-2012 |
20120106323 | NETWORK SYSTEM - A link control function unit | 05-03-2012 |
20120314670 | TRANSMISSION DEVICE, TRANSMISSION METHOD AND TRANSMISSION SYSTEM - Disclosed is a transmission device that addresses the issue of alleviating the occurrence of delays in delivery, or the abandonment, of transmitted data in the transmission device when transmission capacity of the transmission device declines, as well as being easy to set up and maintain. The transmission device comprises a sorting means for assigning a first signal to either a first path or a second path on the basis of assignment information for assigning the first signal; a first transmitting means for transmitting the signal from among the first signal that is allocated to the first path upon the first path; and a second transmitting means for transmitting the signal from among the first signal that is allocated to the second path upon the second path. | 12-13-2012 |
20120327983 | TRANSMITTER APPARATUS, TRANSMISSION METHOD AND TRANSMISSION SYSTEM - There is a problem that if a transmitter apparatus having an adaptive modulation function is to be configured to divide data for transmission, the structure of the transmitter apparatus will be complicated and the cost thereof will be raised. In order to solve this problem, a transmitter apparatus comprises: a dividing means for dividing input data into a plurality of pieces of data; a plurality of transmitting means for transmitting the pieces of data as divided to respective transmission paths; and a modulation scheme deciding means for deciding, from among modulation schemes associated with the conditions of the transmission paths, a modulation scheme, which is to be used by the transmission means, such that the difference in transmission speed between the pieces of data transmitted by the plurality of transmitting means is within a predetermined range. | 12-27-2012 |
20130059529 | WIRELESS NETWORK RELAY APPARATUS - A wireless network relay apparatus includes a Layer 2 switch and a line control device as well as wireless/wired line terminating devices performing band limitation associated with an AMR function. It measures traffic passing through each line terminating device in inflow/outflow path directions. Upon detecting a modulation scheme changed due to an AMR function in a wireless area, it may specify a line terminating device so as to read a desired modulation scheme from a transmission source modulation scheme conversion table of the line control device based on traffic. It may change a local modulation scheme with a desired modulation scheme when a difference therebetween is above a predetermined number of stages. By tracking a modulation scheme changed for a transmission destination, it is possible to appropriately change a modulation scheme for a transmission source, thus suppressing traffic without discarding necessary data. | 03-07-2013 |
20130064094 | DATA COMMUNICATION DEVICE - In a wireless communication network, a data communication device (e.g. a Layer 2 switch) includes a wireless monitoring device, a path cost control device, and a communication path control device. Due to an increase of path costs in wireless areas, the path control device recalculates path costs over a network so as to carry out switching to an appropriate data communication path, e.g. a LAN with blocking a wireless line. When a wireless band is recovered due to an AMR function, the wireless monitoring device sends a path cost change request to the path cost control device, which in turn reduces a path cost at a wireless line port. Additionally, the communication path control device recalculates path costs over a network so as to switch over data communication paths. Thus, it is possible to select an optimum data communication path with a low cost. | 03-14-2013 |
20130070600 | NETWORK REPEATER, QoS CONTROL METHOD AND STORAGE MEDIUM STORING QoS CONTROL PROGRAM | 03-21-2013 |
20130215741 | RADIO TRANSMISSION APPARATUS AND MAC FRAME TRANSMISSION METHOD - In a current station connected to a user network or a radio counterpart station, a radio transmission device with an adaptive modulation function, which switches over a radio transmission capacity in response to fluctuations of quality of radio transmission lines, and a MAC frame transmission device for determining and controlling communication quality are coupled together to function as a Layer-2 switch (L2SW) or a router. The radio transmission device determines a modulation method based on reception power of a reception signal transmitted from the radio counterpart station, wherein the modulation method is multiplexed with a PAUSE frame, which is then output to the MAC frame transmission device. The MAC frame transmission device detects a current radio transmission capacity from the PAUSE frame multiplexing the modulation method, selects QoS setting suited to the radio transmission capacity from among a plurality of QoS settings which are set in advance, and performs a control operation based on the selected QoS setting with respect to a LAN signal from the user network, thus forwarding the LAN signal to the radio transmission device. The radio transmission device modulates the LAN signal, forwarded from the MAC frame transmission device, based on the modulation method, thus transmitting the LAN signal to the radio counterpart station. | 08-22-2013 |
20140198784 | WIRELESS TRANSMISSION DEVICE AND WIRELESS TRANSMISSION METHOD - A wireless transmission device includes a wireless reception unit which receives and demodulates a wireless frame in which a local area network (LAN) signal including a timing packet and an error detection code are multiplexed and converted into a high-frequency wireless output signal from a wireless transmission path, separates the LAN signal from the demodulated wireless frame, and calculates a wireless frame error rate by detecting a signal error of the wireless frame from the error detection code within the wireless frame, and a holdover switching unit which switches an operation mode from a timing reproduction mode in which a clock and a timing pulse are output based on a cycle and a phase reproduced from a timing packet included in the LAN signal to a holdover mode in which a clock and a timing pulse are output based on a cycle and a phase saved at a normal time when the wireless frame error rate calculated by the wireless reception unit is greater than a first threshold value. | 07-17-2014 |
20140307728 | TRANSMITTER, TRANSMISSION METHOD, AND NON-TRANSITORY COMPUTER-READABLE MEDIUM STORING PROGRAM - A transmitter is connected to a master device, and wirelessly transmits a timing packet, which is transmitted from the master device, to a receiver. The transmitter includes: an input unit for receiving an input of a timing packet from the master device; a delay compensation unit for obtaining a packet length of the timing packet and a modulation system used for radio transmission, calculating a device-specific delay value and a first propagation delay value based on the modulation system and the packet length, and calculating a delay compensation value based on the device-specific delay value and the first propagation delay value; a filter unit for adding the delay compensation value to a specific field of the timing packet; and an output unit for outputting the timing packet to the receiver. | 10-16-2014 |