A battery pack having lead wires connected to a plurality of unit batteries which are distributed to prevent malfunction of the batteries due to contact between the unit batteries and the lead wires. The semiconductor memory device comprises a memory array comprising a plurality of word lines arranged in a predetermined sequence, and a word line driver adapted to sequentially address the plurality of word lines in a discontinuous manner relative to neighboring word lines. The line of maximal pulsation is ascertained, and a small incision in the skin is made. Therefore, the present cyclotriphosphazene molecular hydrogel may be efficiently used as a drug carrier for a sustained release of a drug, particularly, a protein drug. The antenna array may comprise: a plurality of microstrip antennas, and a plurality of waveguides.