• Title/Summary/Keyword: Micro valve

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Microbead based micro total analysis system for Hepatitis C detection (마이크로비드를 이용한 초소형 C형 간염 검출 시스템의 제작)

  • Sim, Tae-Seok;Lee, Bo-Rahm;Lee, Sang-Myung;Kim, Min-Soo;Lee, Yoon-Sik;Kim, Byung-Gee;Kim, Yong-Kweon
    • Proceedings of the KIEE Conference
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    • 2006.07c
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    • pp.1629-1630
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    • 2006
  • This paper describes a micro total analysis system ($\mu$ TAS) for detecting and digesting the target protein which includes a bead based temperature controllable microchip and computer based controllers for temperature and valve actuation. We firstly combined the temperature control function with a bead based microchip and realized the on-chip sequential reactions using two kinds of beads. The PEG-grafted bead, on which RNA aptamer was immobilized, was used for capturing and releasing the target protein. The target protein can be chosen by the type of RNA aptamer. In this paper, we used the RNA aptamer of HCV replicase. The trypsin coated bead was used for digesting the released protein prior to the matrix assisted laser desorption ionization time of flight mass spectrometer (MALDI TOF MS). Heat is applied for release of the captured protein binding on the bead, thermal denaturation and trypsin digestion. PDMS microchannel and PDMS micro pneumatic valves were also combined for the small volume liquid handling. The entire procedures for the detection and the digestion of the target protein were successfully carried out on a microchip without any other chemical treatment or off-chip handling using $20\;{\mu}l$ protein mixture within 20 min. We could acquire six matched peaks (7% sequence coverage) of HCV replicase.

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Fundamental study on sound absorption of a dental hand piece using micro-porous EPP substrate processed by UV laser (UV 레이저응용 마이크로 다공성 EPP 기판의 치과용 핸드피스 흡음성능에 관한 기초연구)

  • You, Dong-Bin;Shin, Myung-Ho;Byun, Hyo-Jin;Choi, Do-Jung;Sung, Kuo-Won;Ma, Yong-Won;Shin, Bo-Sung
    • Journal of Convergence for Information Technology
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    • v.9 no.5
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    • pp.158-164
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    • 2019
  • Recently many studies to reduce the noise of dental hand piece which generate inevitably mechanical sound to offend to the ear of a patient have been spotlighted. Generally, methods of adding a sound absorbing material inside the exhaust valve, air pump of machine or automobile are widely reported as optimal way to reduce the mechanical noise. In this paper we studied a new UV laser aided manufacturing of micro-porous structure of EPP substrate and applied dental hand piece to improve the efficiency of sound absorption. A lot of micro-sized pores were fabricated with UV laser processing on the surface of sliced EPP substrate. From fundamental experiments, more high-performance of micro-porous EPP substrate has finally demonstrated for sound-absorbing structure of the micro muffler inside dental hand piece, which actually has the excellent potential to apply a lot of potable machine.

The Microstructure Characteristics of Laser Remelted Cobalt-Based Hardfacing Alloys (레이저 Remelting 처리된 Co 기지 하드페이싱 합금의 미세조직 특성)

  • Han Won Jin;Kim Woo Sung
    • Laser Solutions
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    • v.7 no.2
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    • pp.27-38
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    • 2004
  • Laser remelting of surface of cobalt-based hardfacing alloy can eliminate impurities and cracks and improve the wear resistance. In this present study, Stellite ${\sharp}6\;and\;{\sharp}21$ harfacing alloys were remelted by a 3kW CO2 laser. Hardness distribution and microstructures in the laser remelted zone was investigated. Our results showed that in proper laser parameters laser remelted surface of hardfacing alloy had more refined microstructure and more increased micro-hardness than the base material.

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CFD Performance analysis of Micro Tubular-type hydro turbine by blade shape (블레이드 형상 변화에 따른 마이크로 튜블러 수차의 CFD 성능해석)

  • Park, Ji-Hoon;Hwang, Young-Cheol;Mo, Jang-Oh;Kim, You-Taek;Lee, Young-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.206.1-206.1
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    • 2011
  • Recently, various developments in the area of small hydropower have being made and small hydro turbines are suitable for domestic use because it is a clean and renewable energy source. A small hydropower generator produces power by using the different water pressure levels in pipe lines and energy which was initially wasted by use of a reducing valve at the end of the pipeline is instead collected by a tubular-type hydro turbine in the generator. In this study, in order to acquire the performance of tubular-type hydro turbine applied, the output power, head, efficiency characteristics due to the different guide vane and runner vane angle are examined in detail. Moreover, influences of pressure and velocity distributions with the variation of guide vane and runner vane angle on turbine performance are investigated by using a commercial CFD code.

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Design of the Real-time Water Tank Wireless Control System in a Ship Using the RF and PLC (RF와 PLC를 이용한 실시간 선박용 물탱크 무선 제어 시스템 설계)

  • Park, O.D.;Lee, S.H.;Kim, H.S.;Long, Nguyen Phi;Hieu, Nguyen Hoang;Kim, H.S.;Cha, C.S.
    • Proceedings of the KIEE Conference
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    • 2006.10c
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    • pp.288-290
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    • 2006
  • This paper presents the real-time water tank wireless control in a ship using duplex RF modules and PLC(Programmable logic Controller). The purpose of this paper is developing HMI(Human Machine Interface) for automation equipments. The system can low a cost because long wires are no more used. Analog signals of the water gauge and flow meter are changed to discrete signals by the micro-processor. The PLC checks the volume of water and runs On or Off of the valve and pump. Duplex RF modules send and receive data between the water tank and control room. Everywhere the Internet is used, operators are able to check the status of the system by the web-server.

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Development of High Precision Machining Technology (초정밀 표면 형상 가공기술 개발)

  • 이응숙
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.435-440
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    • 2000
  • In this study, we aims to develop the machining technology for the ultra precision surface and profile accuracy. For this purpose, we construct the electrolytic in process grinding system (ELID grinding) and apply to the cylindrical and internal grinding. Through the various machining experiments such as SCM steel., ceramics, tungsten carbide etc., we have obtained nanometer surface roughness. And we have applied this mirror grinding technique to hydraulic manual valve and mold core of mini disk optical pick-up base. For the development of fine mechanical part machining technology, e have made multi fiber optical connector using fine grinding technology. And constructed micro drilling system with process monitoring system which is possible to drill 50${\mu}{\textrm}{m}$ diameter hole.

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PWM Control of Hydraulic Motor Systems Using High Speed Solenoid Valves (고속응답 전자밸브에 의한 유압 모터계의 PWM 제어)

  • 김도태
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1999.10a
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    • pp.387-392
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    • 1999
  • The micro electronic control technology with developing microcomputers make great contribution to electrohydraulic control systems. The electrohydraulic pulse control simplifies in conjunction with power electronic amplifier and high speed operated solenoid valves. It is necessary to valves to convert electronic pulse signal to hydraulic pulse flow as fast as possible. This study deals with the speed control of an oil hydraulic motor operated by two way high speed solenoid valves. The valves acts as converters of electronic-pulse signals to hydraulic power. By constructing systems in which a hydraulic motor is operated by two solenoid valves, the pulse with modulation method (PWM) has adopted as the speed control of hydraulic motor systems. The static and dynamic characteristics of the systems are investigated by the experiment. It is clarify that a hydraulic motor operated PWM show good performance as a control component, achieving accurate velocity control.

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Technology for Reducing NOx and Soot Particulate using EGR with Water Emulsified Fuel in Diesel Engines (물혼합 연료 및 EGR의 조합에 의한 디젤기관의 질소산화물과 매연미립자 동시저감 기술에 관한 연구)

  • 박권하;박태인;김기형
    • Journal of Advanced Marine Engineering and Technology
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    • v.21 no.4
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    • pp.356-363
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    • 1997
  • Many research works have been carried out to investigate the factors governing the performance of diesel engine. The area of the study has been focused on reducing both of NOx and smoke because of many difficulties to reduce them simultaneously in diesel engines. One of the efforts is an application of EGR technology to reduce NOx emission, which is very effective, but increases other emissions and makes fuel economy worse. In order to solve the problem, EGR is employed with water emulsified fuel and tested in this paper. Emulsified fuel is produced by centrifugal mixer and the amount of water is controlled by water injector and pulse generator, and EGR rate is controlled with 6-step control valve. The chamber pressure, fuel consumption and emissions are measured with various values of both EGR and water mixing rate, The results show that NOx emission is reduced much rather and smoke is also reduced simultaneously.

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Design, fabrication and characterization of a flap valve mircopump using an ionic polymer-metal composite actuator (이온성 폴리머-금속 복합재료 작동층을 사용한 플랩 밸브 마이크로 펌프의 설계, 개발 및 특성 규명)

  • Nguyen, Thanh Tung;Nguyen, Vinh Khanh;Yoo, Young-Tai;Goo, Nam-Seo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.35 no.4
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    • pp.302-307
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    • 2007
  • In this paper, a flap valve micropump with an ionic polymer-metal composite (IPMC) actuator was designed, fabricated, and experimentally characterized. A multilayered IPMC based on Nafion/layered silicate and Nafion/silica nanocomposites was fabricated for the actuation section of the micropump. The IPMC diaphragm, a key element of the mircopump, was designed so that the IPMC actuator was supported by a flexible polydimethylsiloxane (PDMS) structure at its perimeter. This design feature enabled a significantly high displacement of the IPMC diaphragm. The overall size of the micropump is $20{\times}20{\times}5$ ${mm}^3$. Water flow rates of up to 760 ${\mu}l$/min and a maximum backpressure of 1.5 kPa were recorded. A significant advantage of the proposed micropump is its low driven voltage from only 1-3 V. In addition, a simple and effective design, and an ease of manufacturing are other advantages of the present micropump.

Experiments of Micro Jet Injection for Bio-Medical Application (바이오 분야 적용을 위한 마이크로 젯 인젝션 실험)

  • Ham, Young-Bog;An, Byeung-Cheol;Trimzi, Mojiz Abbas;Kim, Jong-Dae;Lee, Gi-Tae;park, Jung-Ho;Yun, So-Nam
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.40 no.10
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    • pp.681-687
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    • 2016
  • It is essential for micro jet injectors in the biomedical sector to operate under high pressure. High pressure injection, however, is accompanied by high volumes. On/Off valves that can be operated at high speeds have been used to address this problem. In this research, piezoelectric actuators which have a response frequency of the order of hundreds of kilohertz were used as the On/Off valve and experiments were applied. Researchers developed a controller to precisely manipulate the piezoelectric valve with various waveforms. They also fabricated five types of nozzles to consider the effect of nozzle type on injection. This allowed researchers to manipulate and confirm factors that can affect the injection volume and force. Results of this experiment have shown how to decrease the injection volume and increase the injection force. and it is predicted that the optimized injection volume and force value can be determined depending on the skin type.