Abstract: A system for estimating values of a vector of variables that optimize a function comprising a weighted sum of interactions between the variables; the system comprising a plurality of parallel hardware channels, each arranged to model a contribution of a respective variable to the function, each channel comprising: a signal generator configured to generate a signal modelling a value of the respective variable; a splitter arranged to supply the signal to each of the channels; interaction logic configured to multiply the vector of signals by a vector of weights modelling an interaction between the respective variable and the vector of variables, thereby generating a feedback signal representing the contribution of the respective variable; and a feedback path to return the feedback signal to the signal generator configured to adapt the signal in dependence on the feedback signal, wherein each channel is implemented only using optical components and/or analogue electronic components.

Abstract: A flexible, durable, comfortable, cost-effective, easy-on, easy-off flexible jewelry cover completely envelopes jewelry articles and elements extending from said articles, preventing the user from scratching, abrading, or otherwise harming other people or articles he may touch. Further, the cover protects the jewelry articles from unwanted, damaging, and messy substances. The cover may be adapted for use on any appendage, including, but not limited to, fingers, toes, wrists, ankles, hands, and feet. Due to the durable, yet flexible material, the cover fits comfortably on any appendage and does not restrict bodily movements. The cover will not pierce or puncture exterior layers of clothing such as gloves and socks. The cover is also disposable, therefore promoting sanitary conditions.

Abstract: A flexible, durable, comfortable, cost-effective, easy-on, easy-off flexible jewelry cover completely envelopes jewelry articles and elements extending from said articles, preventing the user from scratching, abrading, or otherwise harming other people or articles he may touch. Further, the cover protects the jewelry articles from unwanted, damaging, and messy substances. The cover may be adapted for use on any appendage, including, but not limited to, fingers, toes, wrists, ankles, hands, and feet. Due to the durable, yet flexible material, the cover fits comfortably on any appendage and does not restrict bodily movements. The cover will not pierce or puncture exterior layers of clothing such as gloves and socks. The cover is also disposable, therefore promoting sanitary conditions.