• Title/Summary/Keyword: precise stage

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Swaging Autofrettage 의 해석과 원통설계 가공에의 응용

  • ;;Kim, Se Young
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.5 no.4
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    • pp.362-367
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    • 1981
  • Two categories in the design of thick cylinders are suggested and their computer programs are developed; the one termed processing design to ensure the precise inner radius of the cylinder and the other, termd stress compensation design to reduce peak stresses in the cylinder wall. The processing design seeks suitable interference by the method of linear iteration to determine either the radius of the mandrel R or the inner radius ofthe chlinder R$\sub$1/. On the other hand, the stress compensation design seeks first the suitable m and which satisfies the design criteria .sigma.$\sub$actual/ < .sigma.$\sub$allowable/ and then tries to find the suitable interference for given m and .zeta. The design program developed here may be used either in the office at the planning stage of thick chlinders as machine elements of on the processing line to get precise final dimension of inner radius.

Input Shaping for Vibration Reduction in Precise Positioning System (정밀 위치결정 시스템의 진동 저감을 위한 입력성형 기법)

  • Hong, Seong-Wook;Park, Sang-Won;Singhose, William E.
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.4
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    • pp.26-31
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    • 2008
  • 본 논문은 정밀 위치결정 시스템의 잔류진동을 효과적으로 제거할 수 있는 입력성형기법을 소개하고, 실시간 입력성형기법을 적용하는 방법을 설명하였다. 또한 두 가지 응용 분야에 대한 실험결과를 바탕으로 입력성형기법의 성능을 고찰하였다. 일반적으로 입력성형기법은 정밀 위치결정 시스템에 대해 동작 완료시간을 단축시키는 효과가 있을 뿐만 아니라 위치결정 정밀도를 향상시키는 효과가 있다. 그리고 되먹임제어 방법에 비해 적용방법도 간단하며 저렴하게 구성할 수 있다는 장점이 있으므로 많은 정밀 위치결정 시스템에 유용할 것으로 생각된다.

Power/Clock Network-Aware Routing Congestion Estimation Methodology at Early Design Stage (설계 초기 단계에서 전력/클록 네트워크를 고려한 라우팅 밀집도 예측 방법론)

  • Ahn, Byung-Gyu;Chong, Jong-Wha
    • Journal of IKEEE
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    • v.16 no.1
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    • pp.45-50
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    • 2012
  • This paper proposes the methodology to estimate the routing congestion of modern IC quickly and accurately at the early stage of the design flow. The occurrence of over-congestion in the routing process causes routing failure which then takes unnecessary time to re-design the physical design from the beginning. The precise estimation of routing congestion at the early design stage leads to a successful physical design that minimizes over-congestion which in turn reduces the total design time cost. The proposed estimation method at the block-level floorplan stage measures accurate routing congestion by using the analyzed virtual interconnections of inter/intra blocks, synthesized virtual power/ground and clock networks.

Discretization Effects of Real-Time Input Shaping in Residual Vibration Reduction for Precise XY Stage (정밀 XY 스테이지 잔류진동 억제를 위한 실시간 입력성형에서의 이산화 효과에 관한 연구)

  • Park, Sang-Won;Choi, Hun-Seok;Singhose, William;Hong, Seong-Wook
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.4
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    • pp.71-78
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    • 2007
  • Input shaping is known to be a very effective tool for suppressing residual vibration without introducing any complicated sensors and feedback control. Real-time input shaping schemes necessitate a process such that the input command is discretized to deal with non-prescribed, real-time input. Thus parameters associated with input command discretization, such as time spacing and duration time, are unknowns which affect the performance of input shaping schemes, especially for small and fast XY stages. This paper investigates the effects of input command discretization parameters, such as time spacing and duration time, on the dynamic performance of XY stages subjected to real-time input shaping. An experimental system is developed which is equipped with an XY stage driven by servo-motors and real-time user command. Experiments are performed to investigate the dynamic performance of XY stage by changing these parameters and to yield a strategy to gain better performance.

Study on the Air Bearings with Actively Controllable Magnetic Preloads for an Ultra-precision Linear Stage (초정밀 직선 이송계용 능동 자기예압 공기베어링에 관한 연구)

  • Ro, Seung-Kook;Kim, Soo-Hyun;Kwak, Yoon-Keun;Park, Chun-Hong
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.6
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    • pp.134-142
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    • 2008
  • In this paper, we propose a precise linear motion stage supported by magnetically preloaded air bearings. The eight aerostatic bearings with rectangular carbon porous pads were located only one side of vertical direction under the platen where four bearings are in both sides of horizontal direction as wrap-around-design, and this gives simpler configuration than which constrained by air bearings for all direction. Each of the magnetic actuators has a permanent magnet generating static magnetic flux far required preload and a coil to perturb the magnetic farce resulting adjustment of air- bearing clearance. The characteristics of porous aerostatic bearing are analyzed by numerical analysis, and analytic magnetic circuit model is driven for magnetic actuator to calculate preload and variation of force due to current. A 1-axis linear stage motorized with a coreless linear motor and a linear encoder was designed and built to verify this design concept. The load capacity, stiffness and preload force were examined and compared with analysis. With the active magnetic preloading actuators controlled with DSP board and PWM power amplifiers, the active on-line adjusting tests about the vertical, pitching and rolling motion were performed. It was shown that motion control far three DOF motions were linear and independent after calibration of the control gains.

Interleukin-10 UP-regulates TRAIL Gene Expression in the Mammary Epithelial Cell at the Involution Stage

  • B.H. Sohn;Y.M. Han;H.B. Moon;Kim, T.Y.;Y.S. Bae;Kim, S.J.;Lee, Kyung-Kwang
    • Proceedings of the KSAR Conference
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    • 2001.03a
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    • pp.59-59
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    • 2001
  • Interleukin-10 (IL-10) is known as a regulator of inflammation and pathogenesis in mammalian organs, but its precise role is little known in the mammary gland. Our initial experiment showed that IL-10 expression levels in mice decreased at the lactation stage otherwise increased at the involution stage. To reveal the effects of IL-10 on the involution of mammary gland, expression profiles of the apoptosis-related genes were examined in transgenic mice expressing human IL-10 as well as in knock-out mice (IL-10-/-). Mild inflammatory legions by lymphocytes were observed in the mammary glands of transgenic lines at the lactation stage. The expression of TRAIL (Tumor necrosis factor-Related Apoptosis-Inducing Ligand) among the apoptosis-related genes was highly elevated in the transgenic mice while others were not significantly changed. Furthermore, TRAIL was down regulated by four fold in the IL-10-/- mice at the involution stage. The expression of DR4 was elevated at the involution stage of normal mice. DR4 was detected in the milk of transgenic mice but absent in that of normal mice. Our results proposed that the elevated IL-10 at the involution stage recruit lymphocytes and induce TRAIL and DR4 genes, therefore, lead to enter involution stage of mammary glands.

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Development of Micro-EDM Machine for Microshaft and Microhole Machining (미소 축.구멍 가공용 미세 방전 가공기의 개발)

  • 김규만;김보현;주종남
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.1075-1079
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    • 1995
  • It is difficult to machine microparts, such as microshaft and microholes, by conventional machining. Such micropart can be easily machined by EDM because it's machining force is very low. In micro-EDM, the precise electrode movement and discharge energy control are important. Therefore, high precision motion stage and EDM device with high performance is necessary. In this research, a new EDM machine was developed and microshaft and microhole, with various shape and size, was machined.

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Rapid Analysis of Metabolic Stability and Structure of Metabolites in New Drug Development

  • Kim, Dong-Hyun
    • Proceedings of the PSK Conference
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    • 2002.10a
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    • pp.86-87
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    • 2002
  • Recent technological innovations in the drug discovery process such as combinatorial synthesis and high throughput screening have led to the identification of an increasingly large number of compounds at the hits-to-leads stage. Therefore, rapid and precise pharmacokinetic/metabolic screening is essential to enhance the tractability of selected leads and to minimize the risk of failure in the later stages of drug development. (omitted)

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Application of Sensor Technology for the Efficient Positioningand Assembling of Ship Blocks

  • Lee, Sang-Don;Eun, Seong-Bae;Jung, Jai-Jin;Song, Ha-Cheol
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.2 no.3
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    • pp.171-176
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    • 2010
  • This paper proposes the application of sensor technology to assemble ship blocks efficiently. A sensor-based monitoring system is designed and implemented to improve shipbuilding productivity by reducing the labor cost for the adjustment of adequate positioning between ship blocks during pre-erection or erection stage. For the real-time remote monitoring of relative distances between two ship blocks, sensor nodes are applied to measure the distances between corresponding target points on the blocks. Highly precise positioning data can be transferred to a monitoring server via wireless network, and analyzed to support the decision making which needs to determine the next construction process; further adjustment or seam welding between the ship blocks. The developed system is expected to put to practical use, and increase the productivity during ship blocks assembly.

기획단계에서의 최적 개산견적산정의 방법론 고찰

  • Kim Chan-Joong
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • autumn
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    • pp.120-125
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    • 2003
  • The estimated construction costs derived at the Planning stage of a project are utilized as important data determining the feasibility of overall project. Therefore the clients usually expect to have estimations of the construction cost as precise as possible and there has been extensive studies carried out by the cost specialists worldwide to satisfy this client's specific need whereas the local estimators still heavily rely on producing quantities and detail quotations only. This paper is to introduce a case study where elemental/functional area cost analysis is incorporated into a database system for the improved accuracy in cost estimations.

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