摘要:
Provided is a bi-directional optical module including: a transmission optical element including an SOA (semiconductor optical amplifier) aligned on an optical axis of an LD (laser diode) formed on a substrate; and a reception optical element comprising a PD (photodiode) including a light receiving surface perpendicular to the optical axis of the LD of the transmission optical element.
摘要:
Provided is a frequency-tunable terahertz light source device. The frequency-tunable terahertz light source device satisfies a Littrow diffraction condition at a wavelength and simultaneously satisfies a Littman-Metcalf diffraction condition at another wavelength using a double diffraction grating having two grating periods. Thus, oscillations simultaneously occur at the two different wavelengths, such that a terahertz wave can be stably generated by beating of the two oscillation wavelengths. In addition, the frequency-tunable terahertz light source device can readily change a frequency up to several terahertz and can be fabricated in a small size.
摘要:
Provided is a bi-directional optical module including: a transmission optical element including an SOA (semiconductor optical amplifier) aligned on an optical axis of an LD (laser diode) formed on a substrate; and a reception optical element comprising a PD (photodiode) including a light receiving surface perpendicular to the optical axis of the LD of the transmission optical element.
摘要:
An antenna configured for low frequency applications on a mobile device includes an antenna element coupled to a conductive structure which, in turn, is coupled to the user of the mobile device such that the user of the mobile device effectively becomes part of the antenna. The conductive structure can include, for example, the device housing being made from a conductive material, a conductive structure embedded inside the device housing, or conductive pads exposed in the device housing. The antenna element is electrically connected to the conductive structure and the user can be coupled to the conductive structure either through direct contact or through capacitive coupling. In addition, the antenna can include an active element configured to boost free space operation efficiency. The active element can include, for example, a low noise amplifier integrated onto a low noise amplifier board. The active element can be at least partially surrounded by a hollow support structure around which an antenna coil is wrapped, where the antenna coil is coupled to the active element. Furthermore, one or more antenna coils can be utilized either separately or in conjunction with the antenna for low frequency applications, where the one or more antenna coils can have integrated therein inductive components and/or active/switching elements that allow the one or more antenna coils to be tuned to a desired frequency.
摘要:
Provided is a semiconductor laser including a substrate etched into a mesa structure, an active layer, clad layers, a current blocking layer, an etch-stop, an ohmic contact layer, and electrodes, and a method for manufacturing the same, whereby it is possible to improve a ratio of light output to input current by blocking a leakage current flowing outside an active waveguide in a BH laser.
摘要:
The recovery of a polymer product formed by condensing an organo-phosphonic acid dichloride or dibromide, a dihydroxy aromatic compound and, optionally, a crosslinking momomer in an organic solvent reaction medium, as a granular solid is accomplished by combining said organic solvent containing the polymer product and an aqueous solution which contains an effective amount of suspending agent to later induce precipitation of said polymer product and by thereafter agitating the solution while removing the solvent therefrom to affect precipitation of said granular polymer product.
摘要:
There is provided a switching mode power supply having multiple outputs, including: a DC/DC converter converting a DC voltage level according to a change in a load and including a primary coil and a secondary coil; a boost unit boosting an output voltage of the DC/DC converter in a first mode and outputting the boosted output voltage to an output terminal; a bypass unit bypassing the output voltage of the DC/DC converter in a second mode, to output the bypassed voltage to the output terminal; and a boosting controller controlling the boost unit according to a voltage detected at a center tab of the secondary coil of the DC/DC converter.
摘要:
Disclosed is an anti-aging composition for external use on skin, which includes low-molecular weight hyaluronic acids, high-molecular weight hyaluronic acids and polysaccharides extracted from root bark of Ulmus davidiana, as active ingredients. The composition including the low-molecular weight hyaluronic acids, high-molecular weight hyaluronic acids and polysaccharides extracted from root bark of Ulmus davidiana, in a predetermined ratio, shows significantly improved skin-moisturizing, skin elasticity-enhancing and inflammation-alleviating effects, as compared to a composition using one of the above alone. Therefore, the composition may be widely used as a pharmaceutical or cosmetic anti-aging composition.
摘要:
A method and apparatus for modulating pitch and identifying gender of a voice signal is provided. The voice modulation apparatus includes an LPC analyzer for obtaining vocal track filter coefficients reflecting characteristics of an input voice signal, a pitch detector for detecting the pitch and the gender of the voice signal, a pitch modulator for modulating the voice signal by applying a predetermined value to a detected value from the pitch detector, and a coder for coding the input signal from to LPC analyzer and to pitch modulator, and for outputting a coded signal.
摘要:
The invention is related to a preparation method of arbutin intermediate (chemical formula I). It is characterized by the glycosylation of hydroquinone or mono-protectected hydroquinone (chemical formula II) with pentaacetyl-&bgr;-D-glucose (chemical formula III) in the presence of Lewis acid and base as catalysts. where Ac is acetyl group, R is hydrogen, alkyl or cycloalkyl group with 1 to 10 carbon, or aliphatic or aromatic acyl group with 1 to 10 carbon.