Abstract: Provided is a hydrogen ion sensor including: a substrate having a well and a first contact, the well having a second, a third, a fourth and a fifth contacts, the second contact having the same conductive type as the well, and the third, the fourth, and the fifth contacts having an opposite conductive type to the well; a first gate insulation layer on a region between the fourth contact and the fifth contact; a second gate insulation layer on a region between the third contact and the fourth contact; and a hydrogen ion sensing unit formed on the first gate insulation layer, wherein the hydrogen ion sensing unit transfers a voltage level adjusted according to a hydrogen ion concentration of a solution to be measured, to the first gate insulation layer.

Abstract: A portable device for alleviating menstrual pain through transcutaneous electrical nerve stimulation (TENS) and thermal stimulation includes a transcutanous electrical nerve stimulating electrode pad and a planar heater embedded in the stimulating electrode pad. The stimulating electrode pad is a patch type one which is attachable/detachable to/from any body part with menstrual pain. The device further includes a power portion for supplying power to the menstrual pain alleviating unit, and an operation processing portion for generating a transcutaneous stimulating electrode control signal for controlling the transcutaneous stimulating electrode pad and a planar heater control signal for controlling the planar heater. The device further includes a temperature sensor mounted on the planar heater to sense the temperature of the planar heater, and an A/D converter for converting the signal output from the temperature sensor into a digital signal.

Abstract: Provided is a hydrogen ion sensor including: a substrate having a well and a first contact, the well having a second, a third, a fourth and a fifth contacts, the second contact having the same conductive type as the well, and the third, the fourth, and the fifth contacts having an opposite conductive type to the well; a first gate insulation layer on a region between the fourth contact and the fifth contact; a second gate insulation layer on a region between the third contact and the fourth contact; and a hydrogen ion sensing unit formed on the first gate insulation layer, wherein the hydrogen ion sensing unit transfers a voltage level adjusted according to a hydrogen ion concentration of a solution to be measured, to the first gate insulation layer.

Abstract: A hydrogen ion sensing device of the present invention includes: a reference electrode; a sensing portion which senses hydrogen ions by contacting an ion aqueous solution; and a plurality of ring-like lateral bipolar junction transistors, each including a lateral collector, an emitter, a vertical collector and a floating gate connected to the reference electrode, with the emitter surrounded by the floating gate and the lateral collector, wherein the plurality of ring-like lateral bipolar junction transistors are formed on a common substrate and are connected in parallel.

Abstract: The present invention relates to a portable device for alleviating menstrual pain through transcutaneous electrical nerve stimulation (TENS) and thermal stimulation. More particularly, the present invention relates to a portable device for alleviating menstrual pain by applying transcutaneous electrical nerve stimulation to the abdominal and back area of a user through the use of a planar heart embedded in the stimulating electrode pad. The stimulating electrode pad is a patch type one which is attachable/detachable to/from any body part with menstrual pain. The portable device for alleviating menstrual pain in the public area of the user according to the present invention comprises, a menstrual pain alleviating unit and a main body unit.

Abstract: A hydrogen ion sensing device includes: a reference electrode; a sensing portion which senses hydrogen ions by contacting an ion aqueous solution; and a plurality of ring-like lateral bipolar junction transistors, each including a lateral collector, an emitter, a vertical collector and a floating gate connected to the reference electrode, with the emitter surrounded by the floating gate and the lateral collector, wherein the plurality of ring-like lateral bipolar junction transistors are formed on a common substrate and are connected in parallel. With this configuration, an operation point can be adjusted by the bases current with the emitter voltage fixed. In addition, polarities of values of X and Y axes are positive in comparison with a p-channel MOSFET driven with the common collector setting and the device can be operated in a linear region (an active mode) in comparison with ISFET operating in a saturation region.

Abstract: Disclosed herein is a method of measuring an absolute lung volume. In the method, concentrations of oxygen and carbon dioxide gases are measured and analyzed in respiratory gas, consisting of nitrogen (N2), oxygen (O2), and carbon dioxide (CO2), to indirectly measure a concentration of nitrogen, thereby achieving measurement of absolute lung volume, such as a functional residual capacity.

Abstract: Disclosed are water soluble azo dyes, represented by Formula I or II, and their synthesis and use. The water soluble azo dyes are synthesized by diazotizing 4-aminopyridine and coupling the resulting diazo intermediate with alkylated metanilic or orthanilic acid. To be suitable for measuring blood glucose levels, the dyes are combined with m-nitrophenyl boronic acid in an aqueous solvent. A combined ao form of the dyes with glucose shows a peak at 540 nm. At this wavelength, the absorptivity has a tendency to increase with the increasing of glucose level, which allows the measurement of blood glucose levels. ##STR1## wherein R has a 1-4 carbon atom length and is an alkyl, a hydroxy alkyl, a carboxyl-containing alkyl, or a sulfonyl-containing alkyl.