• Title/Summary/Keyword: Force-Touch

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One-Touch Type Immunosenging Lab-on-a-chip for Portable Point-of-care System (휴대용 POC 시스템을 위한 원터치형 면역 센싱 랩온어칩)

  • Park, Sin-Wook;Kang, Tae-Ho;Lee, Jun-Hwang;Yoon, Hyun-C.;Yang, Sang-Sik
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.8
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    • pp.1424-1429
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    • 2007
  • This paper presents a simple and reliable one-touch type multi-immunosensing lab-on-a-chip (LOC) detecting antibodies as multi-disease markers using electrochemical method suitable for a portable point-of-care system (POCS). The multi-stacked LOC consists of a PDMS space layer for liquids loading, a PDMS valve layer with 50 im in height for the membrane, a PDMS channel layer for the fluid paths, and a glass layer for multi electrodes. For the disposable immunoassay which needs sequential flow control of sample and buffer liquids according to the designed strategies, reliable and easy-controlled on-chip operation mechanisms without any electric power are necessary. The driving forces of sequential liquids transfer are the capillary attraction force and the pneumatic pressure generated by air bladder push. These passive fluid transport mechanisms are suitable for single-use LOC module. Prior to the application of detection of the antibody as a disease marker, the model experiments were performed with anti-DNP antibody and anti-biotin antibody as target analytes. The flow test results demonstrate that we can control the fluid flow easily by using the capillary stop valve and the PDMS check valves. By the model tests, we confirmed that the proposed LOC is easily applicable to the bioanalytic immunosensors using bioelectrocatalysis.

A Haptic Interface Using a Force-Feedback Joystick (힘 반향 조이스틱을 이용한 햅틱 인터페이스)

  • Ko, Ae-Kyoung;Kim, Hong-Chul;Lee, Jang-Myung;Choi, Joon-Young
    • Journal of Institute of Control, Robotics and Systems
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    • v.13 no.12
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    • pp.1207-1212
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    • 2007
  • We propose a haptic interface algorithm for joystick operators working in remote control systems of unmanned vehicles. The haptic interface algorithm is implemented using a force-feedback joystick, which is equipped with low price DC motors without encoders. Generating specific amounts of forces on the joystick pole according to the distance between a remote controlled vehicle and obstacles, the haptic interface enables the operator to perceive the distance information by the sense of touch. For the case of no joystick operation or no obstacles in the working area, we propose an origin control algorithm, which positions the joystick pole at the origin. The origin control algorithm prevents the false movement of the remote vehicles and provides the operator with a realistic force resisting the joystick pole's movement. The experiment results obtained under various scenarios exemplify the validity of the proposed haptic interface algorithm and the origin control algorithm.

The Braking Performance of Touch Free Linear Eddy Current Brake According to The number of Poles (극수변화에 따른 비접촉 와전류 제동기의 제동 특성)

  • Ha, Kyung-Ho;Kim, Young-Kyoun;Hong, Jung-Pyo;Kim, Gyu-Tak;Kang, Do-Hyun
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.91-93
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    • 1998
  • This paper describes the braking performance of the eddy current brake for high speed trains according to the number of poles. The eddy current brake systems have to be equipped with the maximum braking force and deceleration in the given volume or mass, high braking force rate, as small normal forces as possible and stable construction. The parameters, such as the number of poles, electric ampere turns, slot width have influence on the braking force characteristics. In this paper, the effect of braking performance from the variation of the number poles is calculated by using FEM, the number of the pole which makes the maximum braking force is proposed.

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Haptic Device for Realizing the Stiffness of Virtual Swatch (가상 스와치를 위한 신축성 구현 햅틱 장치)

  • Lee, Sooyong
    • The Journal of Korea Robotics Society
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    • v.17 no.2
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    • pp.230-237
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    • 2022
  • A technology that allows users to feel the elasticity of fabric through force feedback in the fashion and textile fields is very helpful to related manufacturing and sales areas. Currently bundle of fabrics, so called Swatch, is the only available way for the designer, manufacturer and the end-user to feel the fabrics. Images and video clips provide only visual characteristics, hence touch and stiffness are also very important characteristics to check beforehand. A study is conducted on a haptic device, which estimates the amount of change in the length of the virtual fabric and generates resistive force so that the user could feel the fabric stiffness. Since cables that can only transmit the tensile force are used, a force realization method is proposed, and it is verified numerically and experimentally.

Atomic Force Microscopy Force Mapping Application in Biomedical Research (원자현미경의 나노 힘 측정을 이용한 생의학 연구에의 응용)

  • Cho S.J.;Lee D.J.;Kim E.P.;Lee D.R.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.77-80
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    • 2005
  • Local probe techniques such as scanning probe microscopy (SPM) or atomic force microscopy (AFM) extended our perception into ultra small world. Specially, the sense of touching was extended by AFM into the micro- and nanoworld and has provided complementary new insights of the microscopic world. In addition, touching objects is an essential step before trying to manipulate things. SPM as a touch sensor not only measure the mechanical properties but also detect different properties such as magnetic, electrical, ionic, thermal, chemical and biophysical properties in nanoscale and even less. Obtaining biophysical measurements, monitoring dynamics and processes together with high-resolution imaging of the biomolecules and cells with rather simpler sample preparation than any other techniques give great attractions to the scientists experimenting with biological samples. Among the many AFM capabilities we will specifically introduce the force plot which is used to measure tip-sample interactions and its application this time.

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A Study for the Improvement of Weld Quality Through Force Control of Servo Gun in Resistance Spot Welding using Robot (저항 점 용접 로봇에서 서보건의 가압력 제어를 통한 용접 강도 향상에 대한 연구)

  • Park, Young-Whan;Lee, Jong-Gu;Rhee, Se-Hun
    • Journal of Welding and Joining
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    • v.24 no.6
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    • pp.13-20
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    • 2006
  • Resistance spot welding is widely used for joining sheet metals in the automotive manufacturing process. Recently, servo-gun is used to increase the productivity and precise control the acting force. However, force control mechanisms have not been investigated with servo-guns until now. In this paper, it is proved that servo-motor current is proportional to torque and by experiment, experimental equation between servo-motor current and electrode force was derived. Algorithm for feedback control of electrode force was suggested using current measurement. In addition, applying soft touch method to this system the impact between electrode and specimen, which is the problem of air gun, could be reduced. Indentation made the force decrease in holding time of resistance spot welding. In order to overcome this problem, force compensation using the servo gun was used and it improved weld strength in good welding current range.

Thermodynamic interaction parameter between Zn and Cu, Ag, In, Bi, Pb, Sn in Dilute cadmium alloy by Touch Instant electro-motive force method (순간접전기전력법에 의한 용융 Cd중의 Zn과 Cu, Ag, In, Bi, Pb 및 Sn와의 상위작용 파라미터)

  • 김대룡;윤겸하
    • Journal of Surface Science and Engineering
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    • v.15 no.4
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    • pp.192-207
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    • 1982
  • A study has been made of the interaction parameters of Zn other elements in dilute solutesd solution of molten cadmium alloys over the temperature range of 450 to 570$^{\circ}C$. The experi-mental measurementss were made in a touch instant cell using a fusedd Licl-KCl electrolyte. The activity of zinc in binary and ternary solutions sexhibiteds a strong positive deviation from Raoult's law. The addition of silver, indium or lead increased the activity of zinc whereas addition of copper, bismuth or tin decreased the zinc activity slightly. The results for all the metallic solutions showed a linear dependence of reciprocal of ab-solute temperature over the experimental range. The interaction parameters obtained are as follows.

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Controlling Position of Virtual Reality Contents with Mouth-Wind and Acceleration Sensor

  • Kim, Jong-Hyun
    • Journal of the Korea Society of Computer and Information
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    • v.24 no.4
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    • pp.57-63
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    • 2019
  • In this paper, we propose a new framework to control VR(Virtual reality) contents in real time using user's mouth-wind and acceleration sensor of mobile device. In VR, user interaction technology is important, but various user interface methods is still lacking. Most of the interaction technologies are hand touch screen touch or motion recognition. We propose a new interface technology that can interact with VR contents in real time using user's mouth-wind method with acceleration sensor. The direction of the mouth-wind is determined using the angle and position between the user and the mobile device, and the control position is adjusted using the acceleration sensor of the mobile device. Noise included in the size of the mouth wind is refined using a simple average filter. In order to demonstrate the superiority of the proposed technology, we show the result of interacting with contents in game and simulation in real time by applying control position and mouth-wind external force to the game.

A Study on the Effect of External Electromagnetic force in MIG Welding (MIG 용접 시 외부 전자기력이 미치는 영향에 관한 연구)

  • Kim Jae Seong;Kim Yong;Ryu Deok Hui;Lee Bo Yeong
    • Proceedings of the KWS Conference
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    • v.43
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    • pp.171-173
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    • 2004
  • Electromagnetic force is one of the most important factor that effect on metal transfer mode, short-circuit rate, spatter generation rate and mechanical properties of weld metal etc. Also, shielding gas and welding current have influence on metal transfer mode in GMAW. In this paper, different ways for external electromagnetic forces are applied by attaching cylindrically rounded conducting wire solenoid on touch tip holding. With the applied electromagnetic field, the arc transfer mode changes from normal mode to rotating mode and spatter generation decreased in electromagnetic fields(N-pole). In MIG welding, the influences of electromagnetic force on the spatter generation showed different tendency as in the $CO_2$ welding. It is possible reasons were discussed.

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Design of A Force-Reflecting 3DOF Interface using Phase-Difference Control of Ultrasonic Motors (초음파 모터의 위상차 제어를 이용한 3자유도 힘반영 촉각장치 설계)

  • 오금곤;조진섭;김동옥;김영동;김재민
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.84-87
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    • 1999
  • This paper proposes an interfaces control system to drive a ultrasonic motors(USMs). To touch surfaces and objects created within a virtua environment, the 3 DOF force-reflecting interfaces provides force feedback to users, so to feel touching real things. To effectively display the mechanical impedance of the human hand we need a device with specific characteristics, such as low inertia almost zero friction and very high stiffness. As an actuator for direct drive method, the USMs have many good advantages satisfied these conditions over conventional servo motors. To estimate capability of this interface, we did an experiment. The device works very well, as user are able to detect the edge of the wall and the stiffness of the button.

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