Provided is a preventive, ameliorant or remedy for hypertension excellent in both blood pressure lowering action and blood pressure-rise suppressing action and having high safety. The master BMU sets and distributes the second limit to each one of local battery management function blocks in the battery packs. Other images, which were not classifiable into any of the predefined groups, are processed so as to define a new group containing a subset of the second portion of the images, such that the images in the new group are characterized by new common information shared by all the images in the new group. The method further includes re-classifying each access point based on at least one function of a second set of at least one property of the access point, the second set of properties including the first set of properties. The clock gating circuit re-times the asynchronous logic value to generate a synchronous logic value that is used to toggle the next asynchronous counter.