Abstract: In the present invention, a start request terminal transmits start request information including participation restriction information to a management system. A transmission/reception unit of the management system transmits participation authentication information for authenticating participation in an established session to a middle-of-conference participation terminal. A transmission/reception unit of a participation request terminal transmits, to the management system, participation request information for requesting participation of the participation request terminal in an established session and participation authentication information which is input with the terminal in accordance with the participation authentication information transmitted to the terminal.

Abstract: A management system includes an authentication information management unit configured to manage authentication information used in authentication of a request to participate in a session among communication terminals; a content data management unit configured to manage content data transmitted among the communication terminals in the session; a request acceptance unit configured to accept a request for the content data managed by the content data management unit; an authentication unit configured to perform authentication using the authentication information managed by the authentication information management unit; and a transmission unit configured to transmit the content data managed by the content data management unit to a communication terminal that is a request source of the content data, when authentication of the request for the content data by the authentication unit using the authentication information is successful.

Abstract: There is provided a device including: an inverter 5 including switching elements 51-52 for outputting a U-phase voltage and switching elements 53-54 for outputting a W-phase voltage; midpoint capacitors 31-32; a midpoint stabilizer 2 configured to regulate a power storage amount of each of the midpoint capacitor 31 and the midpoint capacitor 32; and a controller 7 configured to control the switching elements 51-54 so as to supply a desired U-phase voltage and a desired W-phase voltage based on voltages between the U-phase voltage line and the neutral line and the voltage between the W-phase voltage line and the neutral line, and control the midpoint stabilizer 2 so as to adjust the midpoint potential in the O phase based on the condition of the midpoint potential in an O phase at a connecting point between the midpoint capacitor 31 and the midpoint capacitor 32.

Abstract: This circuit constant variable circuit changes the circuit constant of a passive element for which the impedance fluctuates according to the frequency of an AC current. The circuit constant variable circuit is equipped with a first bidirectional switch (Q1) connected in series, a series circuit (20) including a passive element (C1), and a second bidirectional switch (Q2) connected in parallel to the series circuit (20).

Abstract: A power converter 1 includes a first conversion circuit 10 connected with a first winding n1 of a transformer 40, and a second conversion circuit 20 connected with a second winding n2 of the transformer 40. The first and second conversion circuits 10 and 20 are configured to perform bidirectional power conversion. The power converter further includes a third conversion circuit 30 that is a circuit provided at a pre-stage of the first conversion circuit 10 in a direction of transferring electric power toward the second conversion circuit 20 from the first conversion circuit 10. The third conversion circuit 30 is configured to perform bidirectional power conversion, and function as a boosting chopper circuit upon transferring electric power toward the second conversion circuit 20 from the first conversion circuit 10.

Abstract: An image management system for transmitting information via a session established between communication terminals includes a storage unit configured to store image information of an image output from at least one of a first communication terminal and a second communication terminal in a first session in which the first communication terminal and the second communication terminal have participated, the storage unit storing the image information in association with identification information of the first session; and a transmission unit configured to transmit, to the first communication terminal and the second communication terminal, the image information stored in the storage unit and associated with the identification information of the first session when the first communication terminal and the second communication terminal participate in a second session which differs from the first session.

Abstract: A disclosed communication apparatus includes a receiving unit that receives metadata of update data used for an update; a determination unit that determines, based on a description of the metadata, whether or not there is update data that is subject to advance download in which download of the update data is executed before a point of time at which the update is able to start; a control unit that determines whether or not it is timing to perform the advance download; and an update processing unit that downloads the update data in a case in which the determination unit determines that there is the update data that is subject to the advance download and the control unit determines that it is the timing to perform the advance download.

Abstract: An image management system includes an image management unit configured to manage at least a piece of image information among pieces of information transmitted in a session between a plurality of communication terminals, the piece of image information being related to an image output at each of the communication terminals; and a transmission unit configured to send the piece of image information managed by the image management unit to a first communication terminal configured to output an image based on the piece of image information.

Abstract: A power conditioner includes first and second power conversion portions, a smoothing capacitor, and an auxiliary power supply. The first power conversion portion is connected to a DC system. The second power conversion portion is connected to an AC system. The capacitor is connected between wires of an intermediate bus which connects input/output terminals of the first power conversion portion and the second power conversion portion. The auxiliary power supply receives commercial power and generates an auxiliary charge voltage to be applied to the capacitor. The first power conversion portion converts DC power of the storage battery to a first DC voltage and outputs the first DC voltage to the intermediate bus. The second power conversion portion converts a voltage of the capacitor to an AC voltage and outputs the AC voltage to the AC system. The auxiliary charge voltage is lower than the first DC voltage.

Abstract: A power conversion system includes a power conversion device, a connector, and a processing module. The power conversion device is connected to a power system. The attached state and the unattached state of the connector relative to a connecting port that is provided in an apparatus having a battery mounted therein can be selected. The processing module is configured to determine that a malfunction has occurred when a voltage is applied to a portion that electrically connects the connector and the connecting port in a period in which transmission of electric power with respect to the battery is stopped.

Abstract: During a dead time, a resonance current generated by a load current that flows in a resonance inductor and a resonance current generated by an excitation current of a transformer flow in a resonance circuit constituted by the resonance inductor and capacitors that exist in parallel to respective switching elements. A controller performs a turning off operation on the switching elements at a timing that the resonance current generated by the load current and the resonance current generated by the excitation current are cancelled each other during the dead time.

Abstract: Connector for electrical connection includes coupler, cable, switch mechanism, failure detector and transmitter. Coupler is removably inserted in and connected to reception side connector provided in machine which is equipped with storage battery. Cable includes two or more electric wires including power line configured to be electrically connected to reception side connector via coupler. Cable is connected to device that performs at least one of supplying power to machine and receiving power from machine. Switch mechanism opens and closes electrical circuit between coupler and power line. Failure detector detects occurrence of failure of coupler. Transmitter transmits detection result of failure detector to device through at least one first electric wire of the two or more electric wires. Switch mechanism opens and closes the electrical circuit in accordance with control signal transmitted through first electric wire.

Abstract: A DC power supply system includes a DC power supply and a secondary battery for backing up the DC power supply. When a voltage of the DC power supply is lower than a voltage of the secondary battery, the DC power system adds an extra voltage to the voltage of the DC power supply to provide an input voltage to the secondary battery higher than the voltage of the secondary battery by using an electric power of the secondary battery, and the secondary battery is charged.

Abstract: A communication management system includes a first terminal and a second terminal. The first terminal and the second terminal are each configured to transmit and receive content data including at least video and audio data captured at a location of each of the first terminal and the second terminal. The first terminal is designated as a content delivery source and content data captured at the location of the first terminal is transmitted to the second terminal. The second terminal is restricted from transmitting content data captured at the location of the second terminal.

Abstract: A power distribution system includes a DC-DC converter which outputs a DC power after converting the DC power outputted from a DC power source to a desired voltage level. In the power distribution system, the DC-DC converter is controlled so as to operate only when the input voltage falls in a predetermined range.

Abstract: A DC/DC converter has DC input terminals to which a DC power is inputted, a transformer, and a bidirectional switching device on the primary side of the transformer.

Abstract: A communication system include: a first acquisition unit configured to acquire request information of session initiation and authentication information of session participation,; a session management unit configured to establish the session between the first terminal and the second terminal; a second acquisition unit configured to acquire request information of session participation and the authentication information of session participation being input by a third terminal; and a participation determination unit configured to compare the authentication information of session participation obtained by the first acquisition unit with the authentication information of session participation obtained by the second acquisition unit, and the participation determination unit allowing the third terminal to participate in the session when the authentication information of session participation obtained by the first acquisition unit is identical to the authentication information of session participation obtained by the

Abstract: There is provided a device including: an inverter 5 including switching elements 51 52 for outputting a U-phase voltage and switching elements 53 54 for outputting a W-phase voltage; midpoint capacitors 31 32; a midpoint stabilizer 2 configured to regulate a power storage amount of each of the midpoint capacitor 31 and the midpoint capacitor 32; and a controller 7 configured to control the switching elements 51, 54 so as to supply a desired U-phase voltage and a desired W-phase voltage based on voltages between the U-phase voltage line and the neutral line and the voltage between the W-phase voltage line and the neutral line, and control the midpoint stabilizer 2 so as to adjust the midpoint potential in the O phase based on the condition of the midpoint potential in an O phase at a connecting point between the midpoint capacitor 31 and the midpoint capacitor 32.

Abstract: A session control system stores, in a memory, limitation information for each one of a plurality of first sessions where participatable terminals that can participate in the session are limited. The limitation information includes: participatable terminal identification information for identifying each one of participatable terminals allowed to participate in the first session; and participant terminal identification information for identifying each one of the participatable terminals that is participating in the first session. In response to receiving a request for starting a second session with a counterpart terminal by a first terminal, the session control system determines whether the counterpart terminal is participating in any one of the first sessions using the participant terminal identification information, and accepts the request to enable the first terminal to start the second session, when the counterpart terminal is not participating in any one of the first sessions.

Abstract: A power supply apparatus includes a secondary battery and a timer unit for measuring a time required to charge the secondary battery from a first State Of Charge (SOC) to a second SOC, or a time required to discharge the second battery from the second SOC to the first SOC. The power supply apparatus further includes a determination unit for determining a degraded state of the secondary battery based on results of the measurement by the timer unit.