Abstract: An apparatus and method for detecting composite material damage due to impact by using distributed optical fiber are disclosed. In the apparatus and method for detecting composite material damage due to impact by using distributed optical fiber, the position and level of damage occurring in a composite material due to low-velocity impact can be effectively and economically detected by measuring the residual strain of optical fiber distributed on the surface of the composite material or inside the composite material. In the apparatus and method for detecting composite material damage due to impact by using distributed optical fiber, there is no need to always operate a sensor in real time, so that detection errors due to temporary failures, malfunctions, etc. of the sensor, as well as a problem of constantly supplying power to the sensor, can be essentially removed.

Abstract: An apparatus and method for detecting composite material damage due to impact by using distributed optical fiber are disclosed. In the apparatus and method for detecting composite material damage due to impact by using distributed optical fiber, the position and level of damage occurring in a composite material due to low-velocity impact can be effectively and economically detected by measuring the residual strain of optical fiber distributed on the surface of the composite material or inside the composite material. In the apparatus and method for detecting composite material damage due to impact by using distributed optical fiber, there is no need to always operate a sensor in real time, so that detection errors due to temporary failures, malfunctions, etc. of the sensor, as well as a problem of constantly supplying power to the sensor, can be essentially removed.

Abstract: Disclosed is a tap water temperature sensing type of light emitting apparatus, including: a power source 15 adapted to supply power; a control unit 30 for sensing opening/closing state of the tap tube to control the power source 15 such that if the tap tube is opened, power supply is done and if the tap tube is closed, the power supply is stopped; a sensing unit 40 disposed around a portion where hot water and cool water meet for sensing the temperature of water in the tap tube; and a light emitting unit 50 for producing different color lights in accordance with the water temperature read in the sensing unit 40.

Abstract: Disclosed is a tap water temperature sensing type of light emitting apparatus, including: a power source 15 adapted to supply power; a control unit 30 for sensing opening/closing state of the tap tube to control the power source 15 such that if the tap tube is opened, power supply is done and if the tap tube is closed, the power supply is stopped; a sensing unit 40 disposed around a portion where hot water and cool water meet for sensing the temperature of water in the tap tube; and a light emitting unit 50 for producing different color lights in accordance with the water temperature read in the sensing unit 40.

Abstract: An apparatus adopting an iron core and an inertial mass is disclosed for exerting high power output by converting a sound signal to vibration so as to stimulate the human hearing organs through the bones. A sound-to-vibration conversion apparatus comprises a housing, a permanent magnet having an N-pole and an S-pole, only one pole of which is fixed to the housing, an electromagnet movably installed into the housing faced either the S-pole or N-pole of the permanent magnet, whichever one is not fixed to the housing, and an inertial mass for amplifying the inertial force of reciprocating movement of the electromagnet, so that the housing with the permanent magnet can be vibrated by the electromagnet, whereby the electromagnet vibrates in a reciprocating fashion towards or away from the permanent magnet in accordance with the incubation between the polarity formed at the electromagnet by acoustic signal applied to the electromagnet and either the N-pole or the S-pole of the permanent magnet.

Abstract: Disclosed is an apparatus for converting a sound signal into vibration so as to stimulate the human hearing organs through the human bones, using an ironcore and an inertial mass so as to exert high power output. A sound-to-vibration conversion apparatus comprises a housing; a magnet means having N-and S-pole, only one of N- and S-pole being fixed to the housing; and an electromagnet movably fixed to the housing so as to face N- or S-pole, not fixed to the housing, of the magnet means, whereby the electromagnet reciprocates in such directions to get close to or away from the magnet means in accordance with the interaction between the polarity formed at the electromagnet by the acoustic signal applied to the electromagnet and either N-or S-pole of the magnet means.