Abstract:
PURPOSE: The selective assembling method of a single-walled carbon nanotube and a method for manufacturing a field effect transistor with a single-walled carbon nanotube multichannel using the same are provided to prevent the dropping phenomenon of the carbon nanotube from the multichannel. CONSTITUTION: The surface of a substrate is processed into the hydrophilic property. One of natural oxide film, a thermal oxide film, a spin-on-glass-based oxide film, a PECVD-based oxide film, or LPCVD-based oxide film is deposited on the substrate. Single-walled carbon nanotube is selectively assembled with the surface of the oxide film, on the surface of which is processed. The selective arranged pattern of the single-walled carbon nanotube is formed using a photo-resist pattern.
Abstract:
PURPOSE: A selective assembled method of nano-materials by using only photolithography and a fabrication method of a nano-structure multichannel FET devices using thereof are provided to reduce a process step by enabling nano particles to be attached to a substrate through a photolithography and a solution process. CONSTITUTION: In a selective assembled method of nano-materials by using only photolithography and a fabrication method of a nano-structure multichannel FET devices using thereof, an oxide film(SiO2) is formed on a silicon substrate. A random PR pattern is formed on the oxide film through the photo lithography process(S110). A nano-material is absorbed to the surface of a sample through a solution process(S120). A photoresist pattern on the surface of the sample having the nano particles is removed(S130). A multichannel FET device is manufactured by using selectively patterned nano-material.
Abstract:
PURPOSE: A method for manufacturing a nano-wire multi-channel field effect transistor(FET) device is provided to improve current transferability and an electron mobility by arranging one nano-material per the unit channel of a nano-wire array through a solution process. CONSTITUTION: A nano-wire array is manufactured through a laser interference lithography process. A laser beam(10) is expanded through a pin hole to be coherent. The coherent laser beam is transformed into a parallel ray by a collimator(18). The coherency laser beam is arranged toward a lloyds mirror(13) and a sample holder(15) which are perpendicular each other. The nano-wire array self-assembles a nano-material through a solution process. A multi-channel FET device is manufactured using the self-assembled nano-wire.
Abstract:
PURPOSE: Provided is a method for preparing biodegradable porous polymer support for tissue engineering without organic solvent, which is used for regeneration of tissue and excellent in stability. CONSTITUTION: The porous polymer support for tissue engineering is prepared by mixing polymer powder and water soluble salts uniformly; pressing the resulting mixture in mold; jointing the obtained press molding while heating; and removing the water soluble salts from the molding. The polymers are biodegradable polymers selected from the group consisting of polylactide, polyglycolide, polycaprolactone, polytrimethylene carbonate, polyamino acid, polyorthoester, polyethylene oxide and copolymer thereof. The polymers are also nondegradable polymers selected from the group consisting of polyurethane, polyethylene and polycarbonate. The support has the porosity of 50 to 99%. And the pores in the support have the size of 1 to 800 micrometers.
Abstract:
PURPOSE: Provided are a vinyl monomer comprising sulfonated poly(ethylene oxide), its polymer which shows excellent antithrombotic property and can be applied as a material of medical instrument, and a method for preparing the monomer and the polymer. CONSTITUTION: The vinyl monomer is represented by formula 1: CH2=CR-X-NH-A-O-(CH2-CH2-O)n-B-NH-(CH2)3-SO3H(wherein R is -H or CH3, X is -CO-, -CO-O-CH2-CH2-NH-CO-, -CH2-NH-CO- or -CH2, -O-CHOH-CH2-, -A- and -B-, which are same or different, represent -(CH2)-m-, m is 2 or 3, n is 100-200). The vinyl monomer is prepared by the method comprising replacing only amino group at one end of poly(ethylene oxide)(PEO) having both ends substituted with amino group, with sulfonic acid group, and reacting an amino group at the other end of PEO with vinyl compound having vinyl group.
Abstract:
A micro robot driving system for endoscope can move a micro robot forward, backward or changing the direction by transmitting rotation force generated by a driving means to a worm gear or a gear tooth shaped belt by a worm. The micro robot driving system in accordance with the present invention includes a micro robot body, rotational force transmitting means installed in the body, for transmitting rotational force generated by driving means and movement means which is connected with the rotational force transmitting means, protruded from the body, for moving the body by rotational force transmitted by the rotational force transmitting means.
Abstract:
PURPOSE: A micro robot is provided to relieve pain from patient and allow examination of larger intestine to be easily performed by permitting micro robot equipped with a photographing and illuminating device to automatically move in the larger intestine of patient through the use of external air pressure. CONSTITUTION: A micro robot comprises an intestine photographing robot(100) including a camera device(2) equipped with a light emitting diode(3) so as to photograph an interior of a large intestine(1), a cylinder having an impact element(5) for moving the micro robot, an impact buffering device(4) for protecting the camera device and other equipment from the impact generated from the impact element, a plurality of body supports(6) for regulating friction between the large intestine and the micro robot, and a linear driver(7) for controlling direction by independently controlling the body supports; and an air pressure feed unit for determining forward or rearward movement of the micro robot by moving the impact element through suction or charging of air pressure into the cylinder of the intestine photographing robot.
Abstract:
PURPOSE: A bioprosthetic tissue implants and a method for preparing the same are provided in which antithrombotic and particularly calcification resistance are substantially improved by chemically bonding heparin with bioprosthetic tissue. CONSTITUTION: The method for preparing the calcification resistance bioprosthetic tissue implants comprises the step of chemically covalent bonding heparin with the crosslinked bioprosthetic tissue after crosslinking the bioprosthetic tissue obtained from human or animal with glutaraldehyde, wherein the bioprosthetic tissue obtained from human or animal is tissue heart valve, pericardium or dura mater, wherein the heparin is a low molecular weight heparin having a molecular weight of 2000 to 5000, or a high molecular weight heparin having a molecular weight of 7000 to 20000, the heparin that is oxidized and partially decomposed is used in an amount of a solution of 0.05 to 20%, wherein the glutaraldehyde is used in an amount of a solution of 0.05 to 1.5%, and wherein the method further comprises the step of reduction reacting the heparin bonded bioprosthetic tissue with sodium borohydride after the chemical bonding step of the heparin with the crosslinked bioprosthetic tissue.
Abstract:
생체 조직에 혈액 적합성, 생체내 안정성 및 항석회화 특성을 지닌 술폰화 폴리에틸렌 옥사이드 유도체를 화학적 개질 방법으로 공유 결합시켜 제조되는 장시간 사용 가능하고 석회화가 월등히 적은 생체 조직 이식물 및 그의 제조 방법이 기재되어 있다. 본 발명의 개질 방법에 따라 술폰화 폴리에틸렌 옥사이드 유도체를 생체 조직에 결합시킬 경우 혈액 적합성, 생체내 안정성 및 항석회화 특성을 가질 뿐만 아니라 콘드로이틴황산염과 같은 음이온 효과, 공간 충진 효과 및 칼슘 침착 유도 인자 중의 하나로 알려진 콜라겐의 카르복시기를 블로킹하는 효과 등의 상승 작용을 기대할 수 있다. 또한, 본 발명의 방법은 혈전증과 색전증을 억제하고 그 감염도 줄일 수 있기 때문에 석회화 억제 방법으로 더욱 유리하다. 본 발명에 따라 개질된 생체 조직은 생체내 석회화 동물 시험에서 칼슘 침착량의 분석 결과, 술폰화 폴리에틸렌 옥사이드 미함유 대조군에 비하여 매우 적은 값을 나타내어 월등히 개선된 항석회화 특성을 갖고 있음이 입증되었다. 따라서, 본 발명에 의하여 개질된 생체 조직은 생체 조직 이식물로서 이식 후 장기간 사용될 수 있다.