Abstract:
Provided is a high-repetition-rate femtosecond regenerative amplification system. The regenerative amplification system includes: a laser oscillator emitting pulses; a stretcher stretching the pulses with negative dispersion; a regenerative amplifier amplifying the pulses, the regenerative amplifier comprising an acousto-optic modulator for pulse switching, a pulsed pump laser for pumping a gain medium, a resonator for reciprocating the pulses between a plurality of mirrors, and at least one chirped mirror for providing negative dispersion; and a glass compressor compressing the pulses. Accordingly, the 100 kHz-class high-repetition-rate femtosecond regenerative amplification system can produce an output energy of tens of μJ, higher than a few μJ provided by a conventional system.
Abstract:
A detergent supply apparatus comprising a storage space adjacent to a washing space in which washing is performed, a detergent bottle seat provided in the storage space and adapted to receive a detergent bottle containing a liquid detergent, a detergent reservoir in fluid communication with the detergent bottle, and a connecting part adapted to fix a portion of the detergent bottle to the detergent reservoir such that the liquid detergent can flow through the connecting part and into the detergent reservoir by gravitational force.
Abstract:
Provided are a chip, a chip stack, and a method of manufacturing the Same. A plurality of chips which each include: at least one pad formed on a wafer; and a metal layer which protrudes up to a predetermined thickness from the bottom of the wafer and is formed in a via hole exposing the bottom of the pad are stacked such that the pad and the metal layer of adjacent chips are bonded. This leads to a simplified manufacturing process, high chip performance and a small footprint for a chip stack.
Abstract:
The present invention relates to a test question constructing method and apparatus, a test sheet fabricated using the method, and a computer-readable medium storing a test question constructing program for executing the method. In a case where multiple testees simultaneously take a test, correct answer arrangements are made different by the testees through mixing of choices. Further, the correct answer arrangement is adjusted such that correct answers may be not poorly distributed to a specific choice. In particular, the correct answer arrangements of adjacent testees are adjusted to be different from one another. Therefore, cheating, for example, one testee shows other testees the answers or sneaks a look at an answer sheets of other testees, can be prevented. According to the present invention, an ability to classify the testees which was a blind point of a multiple-choice objective test can be markedly improved.
Abstract:
The present invention relates to a monitoring device for a rotating body, which can accurately measure signals from a fiber Bragg grating sensor provided on the rotating body by compensating a transmission loss variation and a distortion of the sensor signals. A rotation-side optical fiber has at least one deformation sensor at a portion thereof and a reference sensor at one end thereof. The sensors are made by forming a Bragg grating in the rotation-side optical fiber. A fixed-side optical fiber is mounted to the fixed body so as to be opposed to the one end of the rotation-side optical fiber. A signal processing unit detects a deformation of the rotating body by subtracting a signal corresponding to the light reflected from the reference sensor from a signal corresponding to the light reflected from the deformation sensor.
Abstract:
A semiconductor device is manufactured by forming a low dielectric constant layer on a semiconductor substrate which is formed with metal lines; implementing primary ultraviolet treatment of the low dielectric constant layer; forming a capping layer on the low dielectric constant layer having undergone the primary ultraviolet treatment; and implementing secondary ultraviolet treatment of the low dielectric constant layer including the capping layer.
Abstract:
Disclosed are a heterojunction bipolar transistor and a method of fabricating the same. A first dielectric layer easily etched is deposited on the overall surface of a substrate before an isolation region is defined. The first dielectric layer and a sub-collector layer are selectively etched, and then a second dielectric layer etched at a low etch rate is deposited on the overall surface of the substrate. Via holes are formed in the first and second dielectric layers, and then the first dielectric layer is removed using a difference between etch characteristics of the first and second dielectric layers. Accordingly, a reduction in power gain, generated at the interface of a compound semiconductor and a dielectric insulating layer (the second dielectric layer), can be eliminated.
Abstract:
Semiconductor devices and methods of manufacture thereof are disclosed that are capable of preventing a short of lower electrodes caused by a leaning or lifting phenomenon while forming the lower electrodes and securing enough capacitance of a capacitor by widening an effective capacitor area. The inventive semiconductor device includes: a plurality of capacitor plugs disposed in an orderly separation distance; and a plurality of lower electrodes used for a capacitor and disposed in an orderly separation distance to be respectively connected with the capacitor plugs.
Abstract:
An apparatus and method of controlling emission of a laser beam in an image forming apparatus. The method includes generating a first reference voltage and a second reference voltage corresponding to a normal mode and a toner save mode, supplying one of the first reference voltage and the second reference voltage corresponding to a mode selection signal in a switching manner, generating a first control voltage and second control voltage to control emission of the laser beam, and supplying a drive current corresponding to one of the generated first and second control voltages to a laser diode to control intensity of the laser beam according to the selection mode.
Abstract:
A digital broadcasting data reception unit receives digital broadcasting data. A multimedia module parses the digital broadcasting data into video and audio data to output the video and audio data. A terminal control unit receives the digital broadcasting data from the digital broadcasting data reception unit when it is transmitted to the multimedia module, and parses the received digital broadcasting data into the video and audio data. A memory unit stores the video and audio data into which the digital broadcasting data is parsed by the terminal control unit according to a control operation of the terminal control unit.