Abstract:
Provided is a frame synchronization method for synchronizing frames with pilot blocks added thereto based on differential correlation information in a satellite communication system. The method can acquire a highly reliable frame synchronization estimation value by achieving a multi-step threshold value test using pilot blocks after a correlation analysis and a threshold test based on a sync signal in order to resolve the problem of a low signal-to-noise ratio and a large frequency error and acquire highly reliable frame synchronization performance, and can overcome distortion of a correlation analysis value caused by the frequency error by analyzing correlation based on differential information. The method includes the steps of: a) performing correlation analysis and a threshold test by using a sync word; and b) performing a multi-step correlation value test by using the pilot blocks added to the frames prior to the sync word.
Abstract:
The present invention provides a method for manufacturing the imide-substituted polymer comprising the following four consecutive steps of (i) the copolymerization step of copolymerizing aromatic vinyl monomers and unsaturated dicarboxylic anhydride monomers, (ii) the separation step of removing the unreacted monomers and solvents from the abovementioned copolymerized solution continuously supplied to the separator, (iii) the imide substitution step of reacting unsaturated dicarboxylic anhydride units in said copolymers with primary amines, and (iv) the devolatilization step of removing low-molecular-weight volatiles from the polymer solution. The imide-substituted polymer manufactured according to the methods in the present invention has greatly improved the heat resistance and the productivity as the content of aromatic vinyl homopolymers is reduced significantly and the reaction time is shortened extensively.
Abstract:
A prefabricated segmental concrete filled tube member, and fabrication structure and method using the same are provided. The prefabricated segmental concrete filled tube member has a hollow pipe filled therein with concrete, and a connection flange shaped in a ring radially extending from the peripheries of both ends of the pipe, wherein the segmental concrete filled tube member is integrally connected with another adjacent segmental concrete filled tube member by the connection flange.
Abstract:
Disclosed herein is a method of manufacturing a package substrate with a fine circuit pattern using anodic oxidation. By anodizing a metal core which is opened through a masking process, oxidation layers are formed in open areas of the metal core to insulate portions of circuit pattern from each other. Further, by electroplating portions provided between the oxidation layers with copper or filling conductive paste between the oxidation layers using a screen, a package substrate having a fine circuit pattern is achieved.
Abstract:
A body biasing structure of devices connected in series on an SOI substrate is provided. According to some embodiments, the shallow junction of common source/drain regions enables all devices to bias by only one body contact on an SOI substrate like a conventional bulk MOSFET, and the floating body effect on an SOI substrate can be prevented.
Abstract:
The invention relates to a novel polypeptide participating in biotin biosynthesis of plant, a polynucleotide encoding the said polypeptide, a method for inducing plant growth inhibition by suppressing the expression or function of the said polypeptide, resulting in inhibition of biotin biosynthesis, and a method for identifying herbicidal compounds that inhibit the expression or function of the said polypeptide. Biotin biosynthesis is an essential process for the growth of plants, however, the process is not present in both human and animals. Therefore, the compounds suppressing the expression or function of the novel polypeptide that relates to biotin biosynthesis can be effectively used as a new herbicide doing human and animals no harm.
Abstract:
Disclosed are a multi-layer printed circuit board and a method for manufacturing the multi-layer printed circuit board. Circuit layers and insulating layers are alternately stacked so that via holes of the circuit layers provided with plated inner walls without application of additional plating and conductive paste-filling steps are connected to via holes of the insulating layers filled with a conductive paste.
Abstract:
A view port of chemical vapor deposition apparatus for manufacturing semiconductor devices prevents heat loss in a chamber during a plasma deposition process. The view port includes a bracket protruding at the circumference of an opening in an electrode serving as a wall of a chamber of the apparatus, a transparent window pressed by the bracket against the wall via an O-ring, a pivoting cap for capping an opening in the bracket aligned with the window, and heat-insulative material and/or a heating element integral with the cap so as to be positioned close to the window when the cap is closed. The heating element can be a resistive heating wire or a warm air duct formed by a hose or the like. During the deposition process, the temperature of the window is maintained, thereby minimizing the tendency of polymer to adhere to the window.
Abstract:
A power semiconductor device having low on-resistance and a high breakdown voltage is disclosed. The power semiconductor device can be a high power MOS transistor or an insulation gate bipolar transistor. The power semiconductor device has unit cells formed in parallel body region strips. A highly-doped drift layer of the same conductivity type as that of a drift region is provided between adjacent body region strips in a unit cell. Both ends of each of the body region strips of the unit cell are connected to a single frame region. This prevents a depletion region of a spherical or cylindrical type from being formed on an edge of the body region, and in so doing, increases a breakdown voltage of the device.
Abstract:
Disclosed is an optical waveguide having a specific dopant distribution capable of reducing a deformation thereof and existence of residual stresses therein, thereby involving no birefrigence. A method for fabricating the optical waveguide is also disclosed. The optical waveguide includes a substrate, a lower clad layer doped with a dopant in a content varying continuously in a thickness direction of the lower clad layer, so that the lower clad layer exhibits a refractive index distribution varying in the thickness direction thereof, and a core layer formed over the lower clad layer.