Abstract:
The present invention relates to a tetrahydrofuran compound having cis substituents, the derivatives thereof and a process for preparing the same, and in particular relates to a dihydrofuran-3-ylidene triflate compound having cis substituents at C2 and C5 positions prepared through Prins-type cyclization using a homopropargylic alcohol derivative as a starting material in the presence of Lewis acid catalyst, a tetrahydrofuran compound having cis substituents at C2, C3 and C5 positions prepared through the hydrolysis of triflate group in the derivatives of the dihydrofuran-3-ylidene triflate compound, and a preparation method thereof.The derivatives and the target tetrahydrofuran compound prepared according to the present invention are hydrofuran compounds with novel structures having cis substituents at C2, C3 and/or C5 positions, which are useful as a derivative for synthesizing drugs such as an antagonist for neurokinin receptor.
Abstract translation:本发明涉及具有顺式取代基的四氢呋喃化合物及其衍生物及其制备方法,特别涉及在C 2上具有顺式取代基的二氢呋喃-3-亚基三氟甲磺酸酯化合物和 在路易斯酸催化剂存在下,使用均二炔醇衍生物作为起始原料,在C 2 N 2上具有顺式取代基的四氢呋喃化合物,通过Prins-型环化制备的C 5 H 3位, 通过在二氢呋喃-3-亚基三氟甲磺酸酯化合物的衍生物中水解三氟甲磺酸酯基制备的C 3和C 5 H 3位及其制备方法。 根据本发明制备的衍生物和目标四氢呋喃化合物是具有在C 2,C 3和/或C 5上具有顺式取代基的新结构的氢呋喃化合物 其可用作合成药物的衍生物,例如用于神经激肽受体的拮抗剂。
Abstract:
The present invention relates to an iris recognition system and method using a multifocus image sequence, the iris recognition system including: an eye image input unit calculating the distance between an image obtaining apparatus and a user using a distance sensor to receive a multifocus eye image sequence having focus information of the user's eye varied at regular time intervals within a predetermined distance using the image obtaining apparatus; an eye image pretreatment unit calculating a fuzzy entropy for the multifocus eye image sequence input from the eye image input unit to select eye images of N number that can effectively express eye image data of various focusing levels, and extracting a multifocus iris image sequence by separating an iris image between pupil and collarette that has various iris patterns, from which an area unnecessary for configuring a feature vector is removed, from the selected eye images; a feature vector extraction unit multi-dividing the multifocus iris image sequence extracted in the eye image pretreatment unit, forming a wavelet feature vector from the multi-divided images using a subband including only a low-frequency area, and generating a wavelet feature vector reduced to a dimension having a high discrimination performance and a dimension-reducing transform function P; a recognition unit discriminating the user's authenticity by measuring a dissimilarity between the feature vector extracted from the feature vector extraction unit and a feature vector already registered; a register unit registering the reduced wavelet feature vector extracted from the feature vector extraction unit and the dimension-reducing transform function P in a storage unit; and a storage unit storing the dimension-reducing transform function P and the reduced wavelet feature vector. Accordingly, the iris recognition system and method using a multifocus image sequence can effectively recognize low-resolution images and poorly focused images as well as high-resolution images and well focused images. Moreover, the iris recognition system and method using a multifocus image sequence can extract the feature vector having a high discrimination performance, enhance the efficiency of a storage device by effectively reducing the dimension of the feature vector, and minimize recognition errors even using a simple recognition apparatus using a wavelet analysis and a direct linear discriminant analysis.
Abstract:
Provided is an MEA for fuel cell containing hygroscopic inorganic material such as TEOS (tetraethylorthosilicate), zirconium propoxide or titanium t-butoxide.
Abstract:
A method for communication between inside and outside of a transmission medium using the transmission medium as a communication line, includes the steps of: receiving an electric signal having information related to a transmission medium from a plurality of sensors inside the transmission medium; conducting the electric signal to the transmission medium; and sensing the electric signal flowing to the outside of the transmission medium. Because a modulating unit is not necessary, a power consumption is minimized. In addition, since an electric signal is directly conducted to a medium, it is not necessary to use an antenna, and thus, degradation of a reception rate according to a directional property of the antenna can be prevented. Moreover, since the electric signal is directly generated in the medium and the medium is directly used as an electric conductor, the overall size of a transmitter is reduced.
Abstract:
A nanometer-sized porous metallic glass and a method for manufacturing the same are provided. The porous metallic glass includes Ti (titanium) at 50.0 at % to 70.0 at %, Y (yttrium) at 0.5 at % to 10.0 at %, Al (aluminum) at 10.0 at % to 30.0 at %, Co (cobalt) at 10. at % to 30.0 at %, and impurities. Ti+Y+Al+Co+the impurities=100.0 at %.
Abstract translation:提供了一种纳米尺寸的多孔金属玻璃及其制造方法。 多孔金属玻璃包括在50.0at%至70.0at%的Ti(钛),在0.5at%至10.0at%的Y(钇),10.0at%至30.0at%的Al(铝),10 %至30.0原子%,杂质。 Ti + Y + Al + Co +杂质= 100.0原子%。
Abstract:
The present invention relates to 1,3-dioxoisoindole derivatives of Formula (1) or pharmaceutically acceptable salts thereof, a preparation method thereof and use thereof as a T-type calcium channel antagonist, based on the fact that 1,3-dioxoisoindole derivatives of Formula (1) show selective antagonistic activity against T-type calcium channel, thus being effective in treating brain diseases, cardiac diseases and neurogenic pains: wherein R1 is a phenyl or a benzyl group, optionally substituted with a moiety selected from the group consisting of a halogen atom, a C1-C6 alkoxy, a C1-C6 alkyl, and a cyano group; R2 is a heterocyclic group selected from the group consisting of piperidinyl, pyrrolidinyl, morpholinyl, and piperazinyl groups, wherein the heterocyclic group is optionally substituted with a C1-C6 alkyl group; and n is 1 or 2.
Abstract:
The present invention provides for a metal oxide nanoparticle that contains a metal core, a shell formed on the surface of the core and consisted of the same metal as the core, and an organic compound containing an element capable of covalently bonding with the nanoparticle and a hydrophilic functional group. According to the examples, uniform-sized hydrophilic metallic oxide-based nanoparticles are obtained when superparamagnetic iron oxide particles, which have a globular shape and are less than 20 nanometers in size, are first synthesized in an organic solution, and then are converted to hydrophilic particles after undergoing surface modification.
Abstract:
Disclosed are a continuous wave supercontinuum laser source resonator using low-priced multimode semiconductor lasers as pumping light and applying a rare-earth doped optical fiber and a Highly Nonlinear Dispersion Shifted Fiber (HNL-DSF) to a ring resonator structure to embody a continuous wave supercontinuum light source, and a medical diagnostic apparatus using the same. The resonator consists of a pump combiner for inputting pumping light into the resonator; a rare-earth doped optical fiber for receiving and converting the pumping light into seed light of a predetermined wavelength band; a Highly Nonlinear Dispersion Shifted Fiber (HNL-DSF) for converting the light converted by the rare-earth doped optical fiber and oscillating in the resonator into a continuous wave supercontinuum laser source; and a coupler for outputting the supercontinuum laser source generated from the Highly Nonlinear Dispersion Shifted Fiber (HNL-DSF). Accordingly, it is possible to embody a simple and inexpensive continuous wave supercontinuum laser source.
Abstract:
A titanium dioxide nanorod having anisotropy and a preparation method thereof in which, particularly, an ultrafine composite fiber of polymer and titanium dioxide precursor and a single crystal titanium dioxide nanorod using a phase separation are prepared, wherein a mixed solution containing titanium dioxide precursor, polymer which is compatible with the precursor and solvent is prepared, the mixed solution is electrospun to form titanium dioxide polymer composite fiber containing ultrafine fibril structure therein by the phase separation between the titanium dioxide precursor and the polymer, the composite fiber is heat-pressed, and the polymer material is removed from the composite fiber, so as to obtain titanium dioxide nanorod, which can be used as dye-sensitized solar cells, various sensors, and photocatalysts.
Abstract:
The present invention relates to a structured catalyst for reforming of gasoline and a method of preparing the same, more particularly to a structured catalyst for reforming of gasoline for fuel-cell powered vehicles prepared by wash-coating the transition metal based reforming catalyst on the surface of the ceramic honeycomb support wash-coated with sub-micron sized alumina or its precursor to sufficiently increase the effective surface area and the performance of the catalyst and a method of preparing the same.