Abstract: A washing machine using ultrasonic vibrations, which can allow a user to at home easily and efficiently wash the laundry that needs hand washing or dry-cleaning. The washing machine includes: a body having an inner space of a predetermined volume; a washing tub installed in the body, with a water supply pipe connected to a side of the washing tub so as to supply washing water or a detergent into the tub and with a drain pipe connected to the side of the tub at a position opposite that of the water supply pipe so as to drain used water or used detergent; a cover mounted to a predetermined portion of the body so as to open or close the tub; and an ultrasonic generator installed in at least one predetermined portion of the tub so as to apply ultrasonic vibrations to a laundry contained in the tub.

Abstract: A comparator circuit according to an embodiment of the present invention includes a comparator configured to compare an input signal voltage with a reference voltage obtained by smoothing the input signal by use of a resistor and a capacitor, and output a result of the comparison, a discharge circuit configured to compare a first addition signal which is obtained by adding a positive first voltage to the input signal voltage, with the reference voltage, and discharge the capacitor when the first addition signal is lower than the reference voltage, and a charge circuit configured to compare a second addition signal which is obtained by adding a negative second voltage to the input signal voltage, with the reference voltage, and charge the capacitor when the second addition signal is higher than the reference voltage.

Abstract: A wavelength division multiplexed self-healing passive optical network using a wavelength injection method includes a central office for coupling modulated multiplexed optical signals (MMOS) and broadband optical signals (BOS)for an upstream light source into one signal transmitted to a plurality of optical network units (ONUs) through a working main fiber and a protection main fiber. A remote node connects to the central office via the main fiber and protection main fiber and to the ONUs through working distribution fibers and protection distribution fibers. The remote node demultiplexes the MMOS and the (BOS) for an upstream light source. The remote node transmits demultiplexed signals to the ONUs, which receive the modulated optical signals and the BOS for an upstream light source which corresponds to predetermined ONUs, and demodulate the modulated optical signals, and modulate upstream optical signals via demultiplexed BOS for an upstream light source.

Abstract: Disclosed are anti-microbial composition, a washing machine including parts manufactured by the same, and a drum washing machine including a stand manufactured by the same. The anti-microbial plastic composition includes 99.0-99.7% of polypropylene and 0.3-1.0% of an anti-microbial master batch, the anti-microbial mater batch having 90% of polypropylene and 5% of isothiazolin compound, and 5% of inorganic compound or 89% of polypropylene, 5% of isothiazolin compound, 5% of inorganic compound, and 1% of silver compound. The isothiazolin compound comprises 4,5-dichloro-2-N-octyl-4-isothiazolin-3-one of chemical formula 1 and 2-N-octyl-4-isothiazolin-3-one of chemical formula 2 at a ratio of 4:1. The inorganic compound is zinc oxide. The washing machine in accordance with the present invention includes the anti-microbial plastic composition, and parts manufactured by the same such that the germs and fungus are prevented from being generated thereof.

Abstract: Process for the preparation of urea from ammonia and carbon dioxide in which the composition of the various process streams is measured via an ultrasonic measuring principle and in which the results of these measurements are used for process control. The process is particularly suitable for continuous measurements in a urea process.