Abstract: A power converter includes a plurality of converters which are connected in parallel to a DC power supply in which an operating point is changed in accordance with an output current or an output voltage. The plurality of converters include maximum power point tracking units for performing maximum power point tracking calculations of the DC power supply. Results of the maximum power point tracking calculations of the plurality of converters are unified between the plurality of converters and the plurality of converters are controlled based on the unified calculation result.

Abstract: A power conversion system is capable of distinguishing easily and clearly between being interconnected to the power system and being in an isolated operation. The power conversion system converts DC power to AC power to interconnect with a power system and injects reactive power into a grid node for determining an isolated operation, including: a voltage detector that detects an output voltage at the grid node; a current detector that detects an output current at the grid node; a frequency measurement unit that measures a frequency of the output voltage at the grid node; a reactive-power measurement unit that measures reactive power at the grid node; and an isolated-operation determination unit that determines whether or not the power conversion system is in an isolated operation as disconnected from the power system. The isolated-operation determination unit includes a reactive-power-fluctuation determination unit that performs a first isolated-operation determination from the reactive power.

Abstract: The present invention relates to a storage apparatus that executes de-duplication processing. Specifically, a storage apparatus includes a storing apparatus configured to provide a first storage area and a second storage area and a control unit. The control unit determines, on the basis of a result of comparison of a compression ratio of compressed data with a threshold, whether first duplication determination for determining whether data same as the data compressed without being stored in the first storage area is stored in the second storage area is executed or second duplication determination for determining whether data same as the data compressed after being stored in the first storage area is stored in the second storage area is executed. Further, the control unit changes the threshold on the basis of a state of the storage apparatus.

Abstract: An air-conditioning planning unit: obtains air-conditioning control plan options indicating setting values for air-conditioning, a first room temperature of a space at a first control time, and a first air-conditioning power usage consumed at the first control time; calculates a second room temperature at a second control time with a first function whose explanatory variables include the first room temperature, the first air-conditioning power usage, and at least one of the options; calculates, for each of the options, room temperature and air-conditioning power usage in a time series by calculating a second air-conditioning power usage at the second control time with a second function whose explanatory variables include the first room temperature, the first air-conditioning power usage, and at least one of the options; calculates an evaluation indicator to evaluate a comfort level and cost; and selects an air-conditioning control plan from the options based on the evaluation indicator.

Abstract: In a storage system, a controller prevents the same chunk data from being stored in a storage device in an overlapped manner, on the basis of data block information showing an association of each data block and a plurality of chunk data configuring each data block, chunk group information showing an association of each chunk data not to be overlapped and a chunk group which each chunk data belongs to, and reference data block information showing an association of each chunk group and a data block having any chunk data belonging to each chunk group as constituent elements.

Abstract: A power storage system is provided with charge switches, discharge switches, a bidirectional DC/DC converter and a power storage system controller connecting all the battery packs to an external circuit to achieve parallel charge and discharge, and the power storage system starts the charge by setting a rated charge current value per one battery pack to Iset and setting the rated charge current value Iset as an initial value of a charge current command value Iref(1), thereafter monitor the charge current of each of the battery packs after elapse of a predetermined time so as to subtract its maximum value Ibmax(1) from the charge current command value Iref(1), and add the rated charge current value Iset to result of subtraction Ierr (Iref(1)?Ibmax(1)) so as to set as a new charge current command value Iref(2) and carry out pre-charge in such a manner as to carry on the charge.

Abstract: A controller in a storage system has chunk statistical information to be information including an overlap prevention effect value of each stored chunk data. For each storage target chunk data to be each chunk data obtained by dividing a data block of a storage target, the controller executes an overlap search to search the stored chunk data matched with the storage target chunk data in an overlap search range to be a part of a plurality of stored chunk data shown by the chunk statistical information and a chunk data group specified from the chunk statistical information and stores the storage target chunk data in the storage device, when the matched stored chunk data is not discovered in the overlap search.

Abstract: In a DC-DC converter, a smoothing capacitor is connected between DC terminals of the switching circuit, and a smoothing capacitor and a voltage clamp circuit are connected between DC terminals of a switching circuit, the voltage clamp circuit including the switching device and the clamp capacitor. The smoothing capacitors are connected to the DC power sources) in parallel, respectively. The winding of the switching circuit is magnetically coupled to the winding of the switching circuit by the transformer. The DC-DC converter performs a discharging operation for discharging the clamp capacitor between at least one of the step-down operation and a step-up operation and a step-up operation performed thereafter.

Abstract: An image compression/decompression device achieving increased utilization efficiency of the memory bandwidth in the access to the memory used for the compression/decompression operation while maintaining ill effect on the images at a low level is realized. The image compression/decompression device comprises a data conversion unit which reduces the data access rate when original images (as input images at the time of performing the compression) and reference images (used for performing the interframe prediction) are stored in the memory by accessing the memory. The access to the memory is performed in an address sequence (order) that differs between data write and data read. This makes it possible to increase the utilization efficiency of the memory bandwidth, and further to reduce the capacity of the buffer memory used for the data read.

Abstract: A file management system that provide a record file rapidly to a terminal, request source, by saving a record file to a storage device set at the local area, and to make it possible to refer it. A first device creates the record file and attribute information indicating the attribute about the record file, stores the record file in a first storage unit, and transmits the attribute information to the second device through the network. A second device receives the attribute information and the record file transmitted from the first device and stores them in a second storage unit. The terminal requests to acquire the record file based on the acquired attribute information to the first device or the second device. The first device or the second device transmits the record file requested to the terminal.

Abstract: A device that performs an image compression/decompression process of compressing original image data based on encoding and decompressing encoded data includes one or more image processing units and one or more variable length encoding/decoding processing units, and the image processing units perform a parallel process according to a parallel number based on a resolution of an image or a frame rate, and the variable length encoding/decoding processing units perform a parallel process according to a parallel number based on a bit rate of a bit stream processed by the image compression/decompression device. In the image compression/decompression device, both of the resolution of the image and the frame rate or either of the resolution of the image and the frame rate is input as a parameter to decide the parallel number.

Abstract: A storage system, in a write process of a file, stores the file in a memory and selects whether or not to perform a deduplication process of a chunk based on whether or not at least one of an attribute of the file and a usage capacity at a time of a chunk being read from the memory satisfies a predetermined condition, with respect to each of multiple chunks composing the file. With respect to the chunks which are selected not to perform a deduplication process, a deduplication process may be performed asynchronously from a write process.

Abstract: In a storage system, a controller prevents the same chunk data from being stored in a storage device in an overlapped manner, on the basis of data block information showing an association of each data block and a plurality of chunk data configuring each data block, chunk group information showing an association of each chunk data not to be overlapped and a chunk group which each chunk data belongs to, and reference data block information showing an association of each chunk group and a data block having any chunk data belonging to each chunk group as constituent elements.

Abstract: Disclosed is a communication technology in which the effect of packet loss can be easily reduced to the extent that it can be ignored, even on networks where packet loss can easily occur. Specifically, a communication device is disclosed that includes a packet loss determination unit that determines whether a packet that transmits image information has been lost, and an interpolated packet transmission unit that transmits an interpolated packet when a packet that transmits image information has been lost.

Abstract: Task: To provide communication technology in which clock synchronization accuracy can be easily maintained, even on networks where packets can be easily lost. Resolution Means: A communication device, comprising: a transmission unit that includes a flag processing unit that, upon receipt of one or a plurality of MPEG-2 TS packets, applies flag information to the packets at a predetermined interval in the forward reproduction direction of the packets, and a time stamp application unit that generates MPEG-2 TTS packets by applying a time stamp value calculated using a GPS clock to each of the one or a plurality of MPEG-2 TS packets, including the MPEG-2 TS packets having the flag information applied by the flag processing unit, and transmits the MPEG-2 TTS packets to a transmission path.

Abstract: A file management system that transmits a record file of voice data or image data created by a local device to a center device over a network and manages the record file in the center device. A first device creates the record file and attribute information indicating the attribute about the record file, stores the record file in a first storage unit, and transmits the attribute information to the second device through the network. A second device receives the attribute information transmitted from the first device and stores it in a second storage unit. The second device receives the record file transmitted from the first device according to transfer condition that is beforehand determined and store it in the second storage unit. A terminal may acquire the record file by using the attribute information.

Abstract: A power supply device of the invention includes a first switching leg including first and second switching elements between DC terminals; a second switching leg including third and fourth switching elements between the DC terminals; a first capacitor leg including first and second capacitors between the DC terminals; a second capacitor leg including third and fourth capacitors between AC terminals; a first inductor between a connection of the first and second switching elements and one of the AC terminals; a second inductor between a connection of the third and fourth switching elements and another of the AC terminals; a controller; an AC power supply connected to the AC terminals and the connection of the third and fourth capacitors; and a DC power supply between the DC terminals, wherein the controller charges the first and second capacitors to a voltage higher than a voltage crest of the AC power supply.

Abstract: Upon receipt of an I/O request instructing storage of data in a storage device 106 from a host apparatus, a storage apparatus 100 selects a de-duplication process method to be applied to the received data, based on at least any of influence on processing performance of the storage apparatus 100 to be performed by execution of a first de-duplication process method (inline method) in which the de-duplication process is performed on the data immediately after the receipt of the I/O request, influence on the processing performance of the storage apparatus 100 to be performed by execution of a second de-duplication process method (post-process method) in which the de-duplication process is performed on the data at later timing, and the size of a temporary storage device 106b to be required for the processing of the data by the second de-duplication process method.

Abstract: A power storage system is provided with a battery and a battery charger which charges a battery pack having a battery voltage and current detection circuit. A charge circuit is structured such as to acquire terminal voltage information of the battery from a battery voltage detection circuit of the battery pack in a charging process, carry out a constant current charge control in a state in which the terminal voltage of the battery is equal to or lower than a previously determined reference voltage value of the battery, and switch to a constant voltage charge control maintaining the output voltage of the charge circuit in the case that the terminal voltage of the battery goes beyond the reference voltage value, thereby carrying on the charge until the battery is fully charged. Therefore, the power storage system can accurately charge the battery to a prescribed amount safely.

Abstract: Chunks that commonly occur in each content type are aggregated in a first container. To be more specific, a storage device used for content backup is configured with: (1) a memory device that provides a memory region for one or a plurality of first containers used to store first chunks that commonly occur in each content type among chunks extracted from the contents of writing targets, and for one or a plurality of second containers used to store other chunks than the first chunks; and (2) a backup unit that decides whether each of the chunks extracted from the contents of the writing targets is a first duplication chunk duplicating a chunk stored in the first container, and further decides, for only a chunk that is decided not to be the first duplication chunk, whether each of the chunks is a second duplication chunk duplicating a chunk stored in the second container, and then stores only a chunk that is decided not to be the second duplication chunk in the second container.