• Title/Summary/Keyword: semi-convergence

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A Piezo-Driven Miniaturized XY Stage with Two Prismatic-Prismatic Joints Type Parallel Compliant Mechanism (2 개의 병진-병진 관절형 병렬 탄성 메커니즘을 갖는 압전구동 소형 XY 스테이지)

  • Choi, Kee-Bong;Lee, Jae Jong;Kim, Gee Hong;Lim, Hyung Jun
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.12
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    • pp.1281-1286
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    • 2013
  • In this paper, a miniaturized stage with two prismatic-prismatic joints (2-PP) type parallel compliant mechanism driven by piezo actuators is proposed. This stage consists of two layers which are a motion guide layer and an actuation layer. The motion guide layer has 2-PP type parallel compliant mechanism to guide two translational motions, whereas the actuation layer has two leverage type amplification mechanisms and two piezo actuators to generate forces. Since the volume of the stage is too small to mount displacement sensors, the piezo actuators embedding strain gauge sensors are chosen. With the strain gauge-embedded piezo actuators, a semi-control is implemented, which results in hysteresis compensation of the stage. As the results, the operating range of $30{\mu}m$, the resolution of 20 nm, and the bandwidth of 400 Hz in each axis were obtained in the experiments.

SWIR-LWIR Photoluminescence from Sb-based Epilayers Grown on GaAs Substrates by using MBE

  • Hussain, Laiq;Pettersson, Hakan;Wang, Qin;Karim, Amir;Anderson, Jan;Jafari, Mehrdad;Song, Jindong;Choi, Won Jun;Han, Il Ki;Lim, Ju Young
    • Journal of the Korean Physical Society
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    • v.73 no.11
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    • pp.1604-1611
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    • 2018
  • Utilizing Sb-based bulk epilayers on large-scale low-cost substrates such as GaAs for fabricating infrared (IR) photodetectors is presently attracting significant attention worldwide. For this study, three sample series of $GaAs_xSb_{1-x}$, $In_{1-x}Ga_xSb$, and $InAs_xSb_{1-x}$ with different compositions were grown on semi-insulating GaAs substrates by using molecular beam epitaxy (MBE) and appropriate InAs quantum dots (QDs) as a defect-reduction buffer layer. Photoluminescence (PL) signals from these samples were observed over a wide IR wavelength range from $2{\mu}m$ to $12{\mu}m$ in agreement with the expected bandgap, including bowing effects. In particular, interband PL signals from $InAs_xSb_{1-x}$ and $In_{1-x}Ga_xSb$ samples even at room temperature show promising potential for IR photodetector applications.

Buckling and vibration of symmetric laminated composite plates with edges elastically restrained

  • Ashour, Ahmed S.
    • Steel and Composite Structures
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    • v.3 no.6
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    • pp.439-450
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    • 2003
  • The finite strip transition matrix technique, a semi analytical method, is employed to obtain the buckling loads and the natural frequencies of symmetric cross-ply laminated composite plates with edges elastically restrained against both translation and rotation. To illustrate the accuracy and the validation of the method several example of cross play laminated composite plates were analyzed. The buckling loads and the frequency parameters are presented and compared with available results in the literature. The convergence study and the excellent agreement with known results show the reliability of the purposed technique.

A Note on S-closed Space and RC-convergence. (S-closed 공간(空間)과 RC 수렴(收斂)에 관하여)

  • Han, Chun-Ho
    • Journal of Industrial Technology
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    • v.5
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    • pp.47-49
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    • 1985
  • Semi-open을 기초로 하여 만들어진 S-closed 공간의 일반적인 성질을 살펴보고 S-closed 공간과 (maximum) filterbase와의 관계를 조사하였다. 이를 바탕으로 regular closed된 cover C, regular open set인 족(族) C, rc-accumulation, (maximum) filterbase에서의 관계(關係)를 살펴 보았다. Mapping theory에서 almost-open almost-continuous map f가 almost continuous되는 것을 보였다.

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Raindrop Size Distribution Over Northeastern Coast of Brazil

  • Tenorio Ricardo Sarmento;Kwon Byung-Hyuk;Silva Moraes Marcia Cristina da
    • Journal of information and communication convergence engineering
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    • v.4 no.1
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    • pp.46-52
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    • 2006
  • Precipitation measurement with ground-based radar needs an information of the raindrop size distribution (RSD) characteristics. A 10-month dataset was collected in tropical Atlantic coastal zone of northeastern Brazil where the weather radar was installed. The number of drop was mainly recorded in 300 - 500 drop $mm^{-3}$, of which the maximum was registered around 1.1 mm drop diameter.

THE RELIABLE MODIFIED OF ADOMIAN DECOMPOSITION METHOD FOR SOLVING INTEGRO-DIFFERENTIAL EQUATIONS

  • Hamoud, Ahmed A.;Ghadle, Kirtiwant P.
    • Journal of the Chungcheong Mathematical Society
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    • v.32 no.4
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    • pp.409-420
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    • 2019
  • In this article, we discussed semi-analytical approximated methods for solving mixed Volterra-Fredholm integro-differential equations, namely: Adomian decomposition method and modified Adomian decomposition method. Moreover, we prove the uniqueness results and convergence of the techniques. Finally, an example is included to demonstrate the validity and applicability of the proposed techniques.

ANALYTIC TREATMENT FOR GENERALIZED (m + 1)-DIMENSIONAL PARTIAL DIFFERENTIAL EQUATIONS

  • AZ-ZO'BI, EMAD A.
    • Journal of the Korean Society for Industrial and Applied Mathematics
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    • v.22 no.4
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    • pp.289-294
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    • 2018
  • In this work, a recently developed semi-analytic technique, so called the residual power series method, is generalized to process higher-dimensional linear and nonlinear partial differential equations. The solutions obtained takes a form of an infinite power series which can, in turn, be expressed in a closed exact form. The results reveal that the proposed generalization is very effective, convenient and simple. This is achieved by handling the (m+1)-dimensional Burgers equation.

SERS Study of Quinoline Using the Silver Surface (Silver Surface를 이용한 Quinoline의 SERS 연구)

  • Lee, Chul-Jae;Jung, Maeng-Joon;Kim, Dong-Yeub
    • Journal of the Korean Society of Industry Convergence
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    • v.14 no.3
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    • pp.101-104
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    • 2011
  • In this study, the experiments for surface enhancement of silver surfaces were done, where we checked the characteristics of silver surfaces made by Tollen's method. The surface enhancement of Quinoline was analyzed by three kind of silver mirror substrates. The assignments of the vibrational bands shown in SERS spectra are given based on both literature and the semi-empirical calculations at the PM3 methods. Finally, we deduced that the adsorption orientation of quinoline was little tilted flat to the silver mirror surfaces by using of the surface selection rules.

Design of Spiral Spring in Sliding Mechanism for Mobile Phones Using Axiomatic Design (공리적설계를 이용한 휴대폰 슬라이드 기구의 스파이럴 스프링 설계)

  • Hwang, Eun-Ha;Han, Deok-Hee
    • Journal of the Korean Society of Industry Convergence
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    • v.10 no.3
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    • pp.171-177
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    • 2007
  • It is well known that mobile phones have been a indispensable communication tool for human life. The spiral springs are used as the main component of the semi-auto sliding mechanism of mobile phones. The characteristic of axiomatic approach is scientific and analytical method, and axiomatic approach is different from other design methods in offering the systematic method at an early stage of design. The axiomatic approach could determine design parameter and arrange the order of design and estimate the optimum design in good order. In axiomatic approach, the composition is divided by customer requirement, functional requirement, design parameter, and design matrix in large portion. This paper presents design in sliding mechanism for mobile phones by finite element method and axiomatic design.

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