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Systems, devices and methods for performing inventory management using RFID technology. The system includes a box for receiving one or more items containing RFID tags. Items are scanned against a baseline content data to confirm all items are present and whether any items have expired. The box has security features to prevent unauthorized access to its contents and create an audit trail of access. Access to the box may be granted when a user presents an authorized RFID-enabled card, wrist band, or other item. Multiple locking features provide for additional security. Scanning, authorization, and notification functions may be controlled locally by a processing unit contained within the box itself or remotely by an outside server.

A conventional hill climbing method is not capable of tracking a maximum power when a shadow covers a part of a solar cell panel and a plurality of maximal values is thereby developed. The invention provides a photovoltaic power generation system control method that controls a photovoltaic output setting value to be an appropriate value by following up a variation in the solar irradiation, including a genetic algorithm process of employing the photovoltaic output setting value as a gene and the output power as an evaluation value thereof; randomly extracting a plurality of genes and repeating storage, selection and crossover / mutation of the output powers which are the evaluation values of the genes, so as to converge a difference between a maximum and minimum values of the output voltages into a predetermined range; and a hill climbing process of setting the photovoltaic output setting value corresponding to the greatest value of the converged output voltages, and a greater and a lower value than the photovoltaic output setting value by a predetermined amount, so as to select the greatest output power among these values; and repeating such steps to track the maximum output power.

A file system layout apportions an underlying physical volume into one or more virtual volumes (vvols) of a storage system. The underlying physical volume is an aggregate comprising one or more groups of disks, such as RAID groups, of the storage system. The aggregate has its own physical volume block number (pvbn) space and maintains metadata, such as block allocation structures, within that pvbn space. Each vvol has its own virtual volume block number (vvbn) space and maintains metadata, such as block allocation structures, within that vvbn space. Notably, the block allocation structures of a vvol are sized to the vvol, and not to the underlying aggregate, to thereby allow operations that manage data served by the storage system (e.g., snapshot operations) to efficiently work over the vvols. The file system layout extends the file system layout of a conventional write anywhere file layout system implementation, yet maintains performance properties of the conventional implementation.

A method and system for synchronizing multiple versions of multimedia objects is provided. Each multimedia object may be identified by a unique identifier. In addition, a history graph may be generated and maintained for each object, where the history graph includes nodes that store unique identifiers and whose vectors describe the relationship between the multimedia objects. Metadata may be used to describe the transformations of objects.

An active information model constructed from an aggregation of personal information portals containing an active agent. In a preferred embodiment, the system of this invention can be offered as a network service providing for information access and exchange according to the individual users' preferences.