Abstract: A sound modeling passive circuit for electric guitars, electric bass guitars, electric-acoustic guitars, or the like includes: a plurality of volume-tone units connected to a pickup installed at one side of saddles to which guitar strings are connected at a front side of a body, the plurality of volume-tone units being configured to adjust tone and volume; an output unit configured to receive a signal output from the plurality of volume-tone units through a signal line and provide the signal through a connection terminal connectable to an external device; and a circuit unit disposed on the signal line and configured such that the signal output from the plurality of volume-tone units sequentially passes therethrough, wherein the circuit unit is selectively actuable by a user to convert the signal or allow the signal to pass.

Abstract: One example embodiment includes a guitar pickguard. The guitar pickguard includes a cover, where the cover is configured to cover at least a portion of a soundboard on a guitar. The guitar pickguard also includes attachment means, where the attachment means releasably attaches the cover to the soundboard.

Abstract: An apparatus for managing a plurality of wireless sensor networks selects a configuring policy according to a characteristic of each wireless sensor network and configures a network with the selected configuring policy for management. When an error occurs in the wireless sensor network, the apparatus performs error diagnosis based on a configuring policy applied to the error-detected wireless sensor network, infers a cause of the error, and provides an error recovery method corresponding to the inferred cause of the error to the error-detected wireless sensor network.

Abstract: An apparatus for managing a plurality of wireless sensor networks selects a configuring policy according to a characteristic of each wireless sensor network and configures a network with the selected configuring policy for management. When an error occurs in the wireless sensor network, the apparatus performs error diagnosis based on a configuring policy applied to the error-detected wireless sensor network, infers a cause of the error, and provides an error recovery method corresponding to the inferred cause of the error to the error-detected wireless sensor network.