Abstract:
This invention relates to methods of preparing oxidation protective multiple coating layers for carbon/carbon composites. More specifically, the invention is directed to a method of applying an oxidation protective multiple coating to a carbon/carbon composite. The method is characterized by the formation of two or more layers of coating on the carbon/carbon composite by using Si.
Abstract:
The present invention relates to a method for manufacturing a mutant library of proteins with various sizes and sequences from a parental protein, microorganisms transformed with plasmids containing recombinant DNAs prepared by the insertion of a genomic DNA fragment into a defective template, a process for preparing proteins with different sizes and sequences from the parental protein which comprises the steps of culturing the transformed microorganisms and obtaining desired proteins from the culture, and proteins prepared by the said process. In accordance with the invention, a mutant library of proteins with various sizes and sequences can be manufactured from a parental protein in an efficient and simple manner, by constructing a library of microorganisms transformed with recombinant plasmids containing E. coli genomic DNA fragments inserted into defective genes and selecting clones expressing proteins with restored functions or modified characteristics.
Abstract:
Disclosed are a micromirror device made in a simple structure using interdigitated cantilevers and having two stable rotational states, and applications thereof. The micromirror device comprises: (a) a substrate; (b) at least two protruded support posts arranged protrudedly in two columns of left and right sides on the substrate and apart by a predetermined interval from each other; (c) multiple cantilevers formed in parallel with the substrate, each having one end attached at the upper end portion of the respective protruded support posts and made in a thin strip having an elastic restoring force, wherein the cantilevers adjacent to each other are arranged to be parallel and interdigitated; (d) mirror support posts coupled to upper portions of the other ends of the cantilevers; (e) a mirror attached on upper portions of the whole mirror support posts and supported by the mirror support posts; and (f) two electrodes formed at left and right sides on the substrate, for providing an electrostatic force to the mirror, wherein the micromirror device reflects light incident into the mirror in different directions from each other by using an electrostatic force due to a voltage applied between the electrodes and the mirror, and the elastic restoring force of the cantilevers. The micromirror device can drive the mirror in two directions and adjust a rotational angle of the mirror using the electrostatic force due to a potential difference between the electrodes and the mirror for reflecting incident light, and the elastic restoring force of the cantilevers.
Abstract:
Disclosed is an electrostatic actuator. A multi-layered auxiliary electrode is further arranged between main electrode and actuating body, and positive charge or negative charge is applied to main electrode, respective auxiliary electrodes, and actuating body such that electrostatic attractive force is generated between auxiliary electrodes adjacent to the main electrode, between adjacent auxiliary electrodes, and between auxiliary electrodes adjacent to the actuating body. According to the invention, distance between the induced charges is shortened, so that electrostatic attractive force therebetween increases, thereby capable of maintaining an actuating range equal to or larger than the conventional electrostatic actuator. The electrostatic actuator according to the present invention can be applied to various MEMS devices, such as an optical switch in which a mirror is formed in the actuator, a radio frequency (RF) switch, or a variable electrostatic capacitor, or the like.
Abstract:
Disclosed are an anisotropic conductive film and a method of fabricating the same suitable for realizing an ultra-fine pitch COG (Chip On Glass) application. The anisotropic conductive film of the present invention is characterized in that 1-30% by volume nonconductive particles (polymer, ceramic, etc.) having a diameter {fraction (1/20)}-null times as large as the conductive particles are added. According to the present invention, the anisotropic conductive film can prevent an electrical shorting between the bumps in bonding ultra fine pitch flip chip as well as in COG-bonding the driver IC. Accordingly, the anisotropic conductive film can be widely used in a communication field using ACA flip chip technology and universal flip chip packages.
Abstract:
A rapid prototyping process and apparatus that provides an intermittent material feed type variable-lamination rapid prototyping using a linear thermal cutting system, wherein intermittently fed materials are cut to have variable lengths, widths, and lateral gradients with the 4-axis control-type linear thermal cutting system controlled by a computer, and based on cutting operation data generated in the computer.
Abstract:
An apparatus for monitoring polarization-mode dispersion and chromatic dispersion in optical networks in accordance with the present invention comprises; an optical distributor for distributing input optical signals, a first light receiver for photoelectrically converting the optical signals distributed by the distributor, a second light receiver for photoelectrically converting the optical signals to measure the average power of the optical signals distributed by the distributor, a filter for filtering output signals from the first light receiver, a power meter for measuring the frequency band of the optical signals filtered by the filter, an analog-to-digital (A/D) converter for converting the analog signals from the first and the second receivers into digital signals, a microprocessor for monitoring the polarization-mode dispersion and the chromatic dispersion of the optical signals by means of the digital signals from the A/D converter, and further a polarization scrambler in the optical signal sending-end.
Abstract:
The present invention relates to a micropump which is driven by movement of a liquid drop based upon continuous electrowetting actuation. The continuous electrowetting means a phenomenon that the liquid drop moves as the surface tension of the liquid drop is electrically varied in succession. When a tube in which electrolyte and a liquid metal drop are inserted is applied with voltage having periodically changing polarity via metal electrodes, the surface tension of the liquid metal is varied so that the liquid metal drop reciprocates in the tube generating pressure or force, which is used as a driving force of the micropump. The micropump is operated in a low voltage and consumes a small amount of electric power.
Abstract:
The present invention relates to a 4-port wavelength selective router and the add/drop multiplexer using the above router. More particularly, it relates to a 4-port wavelength selective router that can effectively routes counter-propagating signals while suppressing multiple reflections generated in the bidirectional transmission systems and networks.
Abstract:
A method of fabricating a refractive silicon microlens by using micro-machining technology. The method of fabricating a refractive silicon microlens according to the present invention comprises the steps of forming a boron-doped region on a silicon substrate, and selectively removing regions of the substrate except for the boron-doped region to form a lens comprised of only the boron-doped region. With the method of the present invention, it is possible to fabricate a two-dimensional infrared silicon microlens array. By using such a two-dimensional infrared silicon microlens array in an infrared sensor, the detectivity of the infrared sensor can be increased by 3.4 times, which is the refraction index of silicon. In addition, the two-dimensional infrared silicon microlens array of the present invention can be used with commercial infrared telecommunication devices.