Abstract: There is provided a liquid discharge apparatus including: a liquid discharge head having a nozzle; an electrode facing the nozzle; a power supply which generates a potential difference between the liquid discharge head and the electrode; a first output unit which outputs a first signal in accordance with an electric change in a case that the liquid discharge head is caused to perform inspection driving; a low-pass filter; a second output unit; a high-pass filter; a third output unit; and a controller. The controller executes determination as to whether or not the liquid is normally discharged from the nozzle, based on the first signal; and determination as to whether or not a short circuit occurs between the liquid discharge head and the electrode, based on a second signal output from the second output unit and a third signal output from the third output unit.

Abstract: A radio communication method of connecting a base station with a plurality of terminal stations, the base station including a plurality of radio communication units compatible with a predetermined communication standard, the method including collecting additional-line information including information regarding whether each terminal station is compatible with additional communication standard; collecting request information including a request in the predetermined communication standard of each terminal station; collecting identifier information that identifies each terminal station; calculating, based on the additional-line information, the request information and the identifier information that are collected, a setting policy including a setting for each radio communication unit, and a switching policy of setting a condition for switching the plurality of radio communication units; and setting, for each radio communication unit, the terminal station to be connected based on the setting policy and the switch

Abstract: A wireless communication system includes a plurality of transmission devices configured to receive broadcast/multicast data transmitted from a broadcast/multicast data transmission device, convert the broadcast/multicast data into wireless frames, and broadcast/multicast the wireless frames to a plurality of reception devices, and the plurality of reception devices configured to receive the wireless frames broadcasted/multicasted from the plurality of transmission devices and acquire the broadcast/multicast data, and each of the plurality of transmission devices includes a broadcast/multicast transmission unit configured to generate the same wireless frame from the broadcast/multicast data and broadcast/multicast the generated wireless frame at the same transmission timing using the same MCS.

Abstract: An image recording apparatus includes a head to discharge liquid from nozzles, an expelling device to expel the liquid from the nozzles, a discharge-testing device to output condition signals according to discharging conditions of the nozzles, a storage to store information concerning the condition signals, and a controller. In response to receipt of a triggering event, the controller controls the discharge-testing device to output the condition signals and stores the information concerning the condition signals in the storage. In response to receipt of a record command, the controller controls the head to discharge the liquid for recording the image. In response to receipt of a particular signal, the controller controls the expelling device according to a determination, based on the information concerning the condition signals stored in the storage, whether the liquid is to be expelled from the nozzles.

Abstract: An image recording apparatus includes a head having nozzles, an expelling device, a discharge-testing device to output condition signals according to discharging conditions of the nozzles, a storage to store information concerning the condition signals, and a controller. In response to receipt of a record command, the controller controls the expelling device to expel a liquid from the nozzles based on the information concerning the condition signals stored in the storage, and thereafter, controls the head to discharge the liquid for recording an image on a recording medium. In response to receipt of a particular signal indicating a potential for receiving the record command, the controller executes a discharging-test process in which the controller controls the discharge-testing device to output the condition signals according to the discharging conditions of the nozzles and a storing process in which the information concerning the condition signals is stored in the storage.

Abstract: A wireless communication characteristic evaluation method for calculating a wireless communication characteristic of a wireless communication system in which a plurality of wireless communication terminals perform communication by transmitting or exchanging signals includes: an RSSI measurement step of measuring an RSSI measurement used for calculation of the wireless communication characteristic; and a calculation step of calculating the wireless communication characteristic based on the RSSI measurement and correction data of the RSSI measurement according to specifications of the wireless communication terminals or a correction calculation model.

Abstract: A method includes collecting, as environment information, a radio environment represented by a signal received at a plurality of radio communication units from another base station, each of the plurality of radio communication units being switchable between a normal mode in which the radio communication unit performs radio communication as a base station and a subordinate mode in which the radio communication unit performs radio communication as a virtual terminal station, calculating test conduct information for each base station based on base station performance information representing a performance of each base station and the environment information, and conducting an operation test of each base station by, based on the test conduct information, setting any of the radio communication units to the normal mode, switching the radio communication units of the other base station to the subordinate mode, and performing radio communication with each other.

Abstract: Provided is a wireless communication system that includes a transmission device configured to receives an input of group-addressed data transmitted from a specific source, convert the group-addressed data into wireless frames, and perform group-addressed transmission of the wireless frames; and a reception device configured to receive the wireless frames transmitted from the transmission device, and identify and receive the group-addressed data of the specific source, wherein a plurality of the transmission devices are provided, and each of the transmission devices is configured to perform group-addressed transmission of the wireless frames into which the group-addressed data is converted, and the reception device is configured to identify and receive the group-addressed data of the specific source from the wireless frames transmitted from the plurality of transmission devices, and perform diversity combining processing of combining the same pieces of group-addressed data.

Abstract: A wireless communication system in which wireless stations perform transmission, a plurality of wireless modules that are operated in a shared frequency band being installed in the wireless stations, wherein the wireless stations each include means for notifying a control device of environment information that includes capacity information regarding the wireless station and information regarding a surrounding wireless environment, the control device includes means for determining an operation mode of each wireless module of each wireless station based on the environment information collected from each wireless station, following a control guideline that is determined in advance, and notifying the wireless stations of the operation modes, and the wireless stations each include means for setting the operation modes in the plurality of wireless modules and changing connection of connection destination wireless stations according to the operation modes of the wireless modules, the wireless stations being notified

Abstract: A transmission apparatus including the number of antennas different from a reception apparatus and performing transmission by SC-MIMO to and from the reception apparatus includes a training signal generation unit that generates a known signal predetermined, a CP addition unit that adds a CP to each symbol of a transmission signal including the known signal, a weight generation unit that generates a transmission weight based on a transposed adjugate matrix that is a product of a channel matrix estimated based on the known signal by the reception apparatus and a complex conjugate transpose of the channel matrix, and a transmission beam formation unit that uses the transmission weight to form a transmission beam for the transmission signal where the CP is added.

Abstract: A wireless communication system includes a plurality of wireless base stations and a measurement station, each wireless base station including a wireless communication unit, a wireless information collection unit, and a measurement result collection unit, the measurement station being configured to control the plurality of wireless base stations, wherein the measurement station generates a measurement condition based on wireless environment information collected by the wireless information collection unit of each wireless base station and notifies each wireless base station of a measurement control signal corresponding to the measurement condition, each wireless base station sends traffic addressed to a subordinate wireless terminal station or broadcast traffic at the same time in accordance with the notified measurement control signal, a measurement result collection unit of a wireless base station that is a measurement target measures wireless communication performance and notifies the measurement station o

Abstract: There are provided a step 1 of, at a measurement point where a throughput of a wireless communication terminal under a new communication standard is to be acquired, measuring or calculating a wireless communication characteristic (throughput) of a wireless communication terminal under a current communication standard; a step 2 of acquiring parameters of a physical layer and a MAC layer at the time of measuring or calculating the wireless communication characteristic of the wireless communication terminal under the current communication standard; and a step 3 of, with the wireless communication characteristic (throughput) measured or calculated for the wireless communication terminal under the current communication standard and the parameters of the physical layer and the MAC layer at that time as inputs, calculating a wireless communication characteristic (throughput) corresponding to parameters of the wireless communication terminal under the new communication standard.

Abstract: In a wireless communication system in which a plurality of wireless stations perform transmission on a shared frequency band, the wireless stations each include means for notifying a wireless station control apparatus of capability and environment information that includes information about capability of a local wireless station and information about a surrounding environment, and the wireless station control apparatus includes control means for selecting, based on capability and environment information collected from the wireless station, a frequency band to be used for the wireless station capable of using a plurality of frequency bands in accordance with a predetermined control index and setting the selected frequency band. Based on an area coverage rate of the wireless station as the control index, a frequency band with which an area coverage rate of the wireless station having an area coverage rate of less than or equal to a predetermined threshold is improved is selected.

Abstract: A fluid sterilization device with a small channel tube is provided. The fluid sterilization device includes a channel tube through which a fluid flows, and a light source unit that irradiates an inside of the channel tube with an ultraviolet ray. The channel tube includes a transparent tube transmitting the ultraviolet ray, and a reflector formed of an unsintered PTFE film, disposed in contact with an outer peripheral surface of the transparent tube, and reflecting ultraviolet rays transmitted through the transparent tube. The reflector is formed by laminating a plurality of unsintered PTFE films so that facing surfaces of the unsintered PTFE films are in close contact with each other.

Abstract: A small and lightweight fluid sterilization device is provided. The fluid sterilization device includes a light source unit configured to emit an ultraviolet ray, and a channel space which the ultraviolet ray emitted from the light source unit enters, the channel space being a space through which a fluid flows. The light source unit includes a mounting substrate, and an LED package mounted on the mounting substrate. The LED package includes a light emitting element configured to emit the ultraviolet ray, and a lid portion transmitting the ultraviolet ray from the light emitting element, disposed in contact with the channel space, and configured to conduct heat conducted from the light emitting element to a fluid flowing through the channel space.

Abstract: A radio base station device includes a plurality of radio units that perform communication with a radio terminal device, a packet data collection unit that collects packet data communicated by the plurality of radio units on the basis of a packet collection policy, a collected packet data analysis unit that performs analysis on packet data on the basis of a packet analysis policy, and transmits analysis result information to the control station device, and an information processing unit that transmits base station performance information and analysis result information to the control station device, and receives a packet collection policy and a packet analysis policy.

Abstract: Provided is a wireless communication system that includes a transmission device configured to receive an input of group-addressed data transmitted from a specific source, convert the group-addressed data into wireless frames, and perform group-addressed transmission of the wireless frames; and a reception device configured to receive the wireless frames transmitted from the transmission device, and identify and acquire the group-addressed data of the specific source. The transmission device includes coding means for defining a plurality of wireless frames as a frame block, performing error correction coding on the frame block, and performing group-addressed transmission of the frame block, and the reception device includes decoding means for identifying the frame block from the received wireless frames, performing error correction decoding in units of frame block, and reconfiguring the group-addressed data of the specific source.

Abstract: A wireless communication system in which wireless stations perform transmission, a plurality of wireless modules that are operated in a shared frequency band being installed in the wireless stations, wherein the wireless stations each include means for notifying a control device of environment information that includes capacity information regarding the wireless station and information regarding a surrounding wireless environment, and setting frequency channels in the plurality of wireless modules, the wireless stations being notified of the frequency channels by the control device, and the control device includes means for calculating a frequency channel of each wireless module of each wireless station based on the environment information collected from each wireless station, following a control guideline that is determined in advance, and notifying the wireless stations of the frequency channels.

Abstract: A measurement station collects radio base station performance information related to a radio communication performance of each radio base station, radio connection information related to a radio communication performance and a communication status of a corresponding radio terminal station, generates a measurement condition and an expected measurement result based on the radio base station performance information and the radio connection information, and notifies a measurement control signal corresponding to the measurement condition to the radio terminal station through the radio base station; the radio terminal station performs a communication setting of an own station based on the notified measurement control signal, and notifies a measurement preparation status to the measurement station; and the measurement station measures the radio communication performance by causing a flow of a measurement traffic to the radio terminal station through the radio base station, acquiring a measurement result, and determi

Abstract: A wireless communication characteristics evaluation method for evaluating wireless communication characteristics of a wireless communication system where a plurality of wireless communication terminals perform communication by transmitting or exchanging signals, the wireless communication characteristics evaluation method including: a step 1 of acquiring power and a band of an interference signal; a step 2 of calculating an interference band rate showing a rate of the band of the interference signal that overlaps with a band of a desired signal; a step 3 of calculating an interference power rate from interference power and the interference band rate and furthermore, calculating steady noise power from the interference power and the interference power rate; a step 4 of determining a real SINR from received power of the desired signal and the steady noise power; and a step 5 of determining wireless communication characteristics of the desired signal from the real SINR.