Abstract: A radio frequency (RF) weak magnetic field detection sensor includes a ferromagnetic core, a pickup coil disposed to surround the ferromagnetic core, a substrate that includes an opening, a core pad connected to the ferromagnetic core and a coil pad connected to the pickup coil, and an insulating tube interposed between the ferromagnetic core and the pickup coil. The insulating tube includes a bobbin around which the pickup coil is wound, and a core hole formed to pass through the bobbin and configured to accommodate the ferromagnetic core.

Abstract: An apparatus and method for transmitting and receiving magnetic field signals in a magnetic field communication system are provided. The apparatus includes a controller configured to generate a communication signal, matching units that are configured to receive the communication signal and that respectively correspond to different matching frequencies, and loop antennas that are connected to the matching units, respectively, and that are configured to convert communication signals according to the different matching frequencies into magnetic transmission signals in the form of magnetic field energy and to transmit the magnetic transmission signals.

Abstract: A first-in first-out solder container automatic supply management system includes a refrigerating chamber configured to store a plurality of solder containers, a transfer part positioned outside the refrigerating chamber and configured to move at least one of the plurality of solder containers, a stirring part formed at one end of the transfer part and configured to stir the at least one solder container, and a hand part configured to move any one solder container of the at least one solder container positioned on the transfer part to the stirring part.

Abstract: Disclosed are an active layer composition for a solar cell containing a two-dimensional conjugated polymer that has excellent thermal/chemical stability and may improve power conversion efficiency of an organic solar cell via realization of high open-circuit voltage and short-circuit current, a preparation method of the composition, and an organic solar cell containing the composition. The composition contains a two-dimensional conjugated polymer having a repeating unit represented by a following Chemical Formula 4-2 as an electron donor material: where in the Chemical Formula 4-2, n is an integer of 5 to 2000.

Abstract: A first-in first-out solder container automatic supply management system includes a refrigerating chamber configured to store a plurality of solder containers, a transfer part positioned outside the refrigerating chamber and configured to move at least one of the plurality of solder containers, a stirring part formed at one end of the transfer part and configured to stir the at least one solder container, and a hand part configured to move any one solder container of the at least one solder container positioned on the transfer part to the stirring part.