Image feature values Va and Vb are derived from image data, coefficients C and D are determined based on the image feature values Va and Vb, and an approximate expression expressed with the file size Sfj of the JPEG compression file and the quantization data coefficient value Aqt is derived. The device includes an implant member configured to be anchored in a tongue, a dental plate configured to be worn upon mandibular teeth, and a coupling member couplable between the implant member and the dental plate to promote direct anterior displacement of the tongue. The nanowire-crossbar array includes a number of spintronic devices.