Abstract: The present invention relates to a hybrid speaker, having a high-frequency tweeter and a low-frequency woofer formed on the same axis, for improving sound quality by separately emitting a high-frequency sound generated by the high-frequency tweeter and a low-frequency sound generated by the low-frequency woofer. A device according to the present invention comprises: a woofer part for generating a low-frequency sound; a tweeter part for generating a high-frequency sound; a substrate for supplying an electrical signal to coils of the woofer part and the tweeter part; a lower frame for accommodating constituent components on the same axis; and an upper frame coupled to the lower frame to form a speaker housing, and separately having a low-frequency sound emission port for emitting the low-frequency sound of the woofer part and a high-frequency sound emission port for emitting the high-frequency sound of the tweeter part.

Abstract: A rope terminal fixing method is provided, which may be used easily at a construction site, causes less shearing load, and may reliably prevent the falling-off of the rope. The rope terminal fixing method comprises the following steps. A tubular terminal metal fitting which comprises a proximal opening, a distal opening, and a through hole communicating the proximal and distal openings is prepared. A terminal of a rope is inserted through the proximal opening into the through hole, a portion of the terminal of the rope extended from the distal opening is loosened, and a diameter-enlarging member is fixed to a core wire of the rope. Then, the terminal of the rope is brought back into the through hole. A fixed width portion extending in an axial direction of the terminal metal fitting is pressed from the outside in a circumferential direction by swaging, such that a protrusion constraining the rope so as to reduce its diameter is formed in the through hole.

Abstract: An energy storage apparatus includes an input unit connected to a solar cell to receive a DC power, a sensing unit for sensing and outputting a voltage of the solar cell, a signal generating unit for generating a periodic signal whose magnitude is periodically changed, a voltage generating unit for variously generating a reference voltage corresponding to the periodic signal, a control signal generating unit for generating a duty control signal by using regions in which the periodic signal has a magnitude lower than or higher than the reference voltage, a charging unit for performing a charging operation by means of an on/off switching operation according to the duty control signal, a battery unit for charging an energy by means of the charging operation of the charging unit, and a main control unit configured to control so that the charging operation is initiated with a reference voltage.

Abstract: An energy storage apparatus includes an input unit connected to a solar cell to receive a DC power, a sensing unit for sensing and outputting a voltage of the solar cell, a signal generating unit for generating a periodic signal whose magnitude is periodically changed, a voltage generating unit for variously generating a reference voltage corresponding to the periodic signal, a control signal generating unit for generating a duty control signal by using regions in which the periodic signal has a magnitude lower than or higher than the reference voltage, a charging unit for performing a charging operation by means of an on/off switching operation according to the duty control signal, a battery unit for charging an energy by means of the charging operation of the charging unit, and a main control unit configured to control so that the charging operation is initiated with a reference voltage.

Abstract: The present invention pertains to a composite girder for bridge construction. More preferably, a girder is formed in a rectangular shape that is horizontally long and opened at the top portion thereof, wherein the girder is convexly curved in the center so as to be formed in the shape of an arch. The girder has a compression section, a web and a tension section, which are integrally composed together, and is filled with concrete inside the girder so as to increase the sectional strength of the girder. Simultaneously, a stopper is formed on the inside surface of the compression section to prevent the separation of the steel materials and the concrete.

Abstract: The present invention pertains to a composite girder for bridge construction. More preferably, a girder is formed in a rectangular shape that is horizontally long and opened at the top portion thereof, wherein the girder is convexly curved in the center so as to be formed in the shape of an arch. The girder has a compression section, a web and a tension section, which are integrally composed together; and is filled with concrete inside the girder so as to increase the sectional strength of the girder. Therefore, it is possible to reinforce a support that receives a great shearing stress even without the use of any rebar. Simultaneously, a stopper is formed on the inside surface of the compression section to prevent the separation of the steel materials and the concrete. Therefore, compared with the existing girders, the composite girder of the present invention may be mounted over a noticeably long span.

Abstract: In order to provide a pavement body that is well drained and that keeps a part of water at a time of rain so as to avoid generation of a large amount of discharging water, that supplies the kept water to a surface layer at a time of drought and that soaks up the water of the roadbed so as to lower the temperature of the surface layer, a middle layer part (12) is formed by laying a porous aggregate mixture (a) made by mixing a porous material with a solidification material of a cement system, and a surface layer part (11) is formed by laying an asphalt mixture (b) having a water permeable function on the middle layer (12) so that a base course (1a) comprising a pavement body (1) is formed.

Abstract: An information apparatus having an RFID tag and a control method thereof. The information apparatus includes the RFID tag part which comprises an RF receiver receiving an external RF signal, an RF transmitter transmitting an RF signal to outside, a logic part performing controlling and comparison, and a tag memory storing data; and a controller which stores a digital content provided from outside by directly accessing to the tag memory without passing through the RF receiver and the RF transmitter. Accordingly, the digital content stored to or reproduced at the information apparatus is easily transferred and stored to the personal device having the RFID reader and then used. Thus, the utilization of the digital content can be drastically enhanced.

Abstract: A portable music performance device combines an external audio input, such as a singer's voice singing the lyrics of a song into a microphone, and stored musical accompaniment data for the song, preferably data stored in a ROM package, and produces an RF signal for transmission to a receiver.