• Title/Summary/Keyword: Mobilities

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Influence of ion mobilities on discharge characteristics of AC-PDPs

  • Lee, In-Sook;Choi, K.Y.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.491-494
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    • 2004
  • With recent experiments to add He atoms to the Ne-Xe discharge gas mixture for high luminous efficiency PDPs, we have performed simulations on a coplanar structured AC-PDP sustained in the three species He-Ne-Xe gas mixture. We found that the correct ion mobilities are essential to get the meaningful simulation results. We determined ion mobilities in the mixture gas and presented the calculated results regarding the influence of ion mobilities on discharge characteristics.

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Mobility and Early Study Abroad as Transnational Migration: Categorization of Korean ESA in Singapore through a Follow-up Longitudinal Case Study (초국적 이주로서의 조기유학 : 싱가포르의 한국인 조기 유학생 추적 조사를 통한 이동성(mobility) 유형화)

  • KIM, Jeehun
    • The Southeast Asian review
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    • v.24 no.2
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    • pp.207-251
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    • 2014
  • This study explores the mobility patterns of Korean Early Study Aborad (ESA, hereafter) students in Singapore through a follow-up longitudinal case study, which was initially conducted about five years before this study. This study takes up transnational migration approach, focusing on family strategies and mobilization, which steered their mobility. Interviews with seven original families as well as 7 families additionally recruited in Singapore in 2012 were collected and analyzed by NVivo 9. In short, this study found that transnational mobility is composed of mobilities at global, regional and local levels. There were four types of mobilities; continuation of stay in Singapore, move from a third county to Singapore, return to Korea, and, what this research calls, fluid mobility. Examining the process of these mobilities shows that we need to consider at least three factors (performance of children's schooling; change of family circumstances; context of reception for both Singapore and Korea) as basic backgrounds. On this basis, the interplay between the context of receptions when aspirations for children's advancement by these transnational families made either facilitate or constrain their mobilities: contexts of Singapore and Korea may play a role of hurdle or trampoline. Also, local context of Singapore largely facilitate mobilities of Korean ESA families at both local and global levels.

Estimation of Vibrational Power Supplied From Vibration Source to Supporting Structure (진동원으로부터 지지구조물에 전달되는 진동 파워의 추정방법)

  • 김재철;이종원
    • Journal of KSNVE
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    • v.8 no.2
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    • pp.306-312
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    • 1998
  • This paper proposes a method for estimating the vibrational power supplied by a machine that generates excitation force to its supporting structure via the coupling points. The basis of the method is that the vibrational power can be calculated using the mechanical impedance and the velocity at the coupling points on the supporting structure. First, a method is described to estimate the mobilities at the coupling points when the machine is not separable from the supporting structure, then the vibrational power is calculated using the estimated mobilities and measured velocities at the coupling points. The mobilities are estimated from the result of impulsive testing of the coupled structure. The method is investigated using an experimental model. The estimated and measured values of the mobilities and the vibrational power are compared. It is shown that the estimated values agree well with the measured values.

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Study on the Effect of the Mg2+ Ion on the Behavior of Anionic Surfactants in Electrophoresis (전기 이동에서 Mg2+ 이온이 음이온 계면활성제의 거동에 미치는 영향)

  • Jeong, Hyuk
    • Analytical Science and Technology
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    • v.18 no.1
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    • pp.35-42
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    • 2005
  • This study reports the effect of $Mg^{2+}$ ions on the behavior of the anionic surfactant in electrophoresis. Intractions of $Mg^{2+}$ ions with carboxylates and sulfonates resulted large changes in their apparent mobilities. A comprehensive analysis of the electroosmotic and electrophoretic mobilities reveals that major cause for the variation of the apparent mobilities of anions arises from the electroosmotic mobilities.

Study on the Estimation of Vibrational Power Supplied From Source to Supporting Structure (진동원으로부터 지지구조물에 전달되는 진동 파워의 추정방법)

  • ;;Ohno, Shinichi
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1997.10a
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    • pp.379-384
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    • 1997
  • This paper proposes a method for estimating the vibrational power supplied by a machine that generates excitation force to its supporting structure via the coupling points. The basis of the method is that the vibrational power can be calculated using the mechanical impedance and the velocity at the coupling points on the supporting structure. First, a method is described to estimate the mobilities at the coupling points when the machine is not separable from the supporting structure, then the vibrational power is calculated using the estimated mobilities and measured velocities at the coupling points. The mobilities are estimated from the result of impulsive testing of the coupled structure. The method is investigated using an experimental model. The estimated and measured values of the mobilities and the vibrational power are compared. It is shown that the estimated values agree well with the measured values.

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Study on the Effect of the SDS on the Behavior of Anionic Surfactants in Electrophoresis (전기영동에서 SDS가 음이온 계면활성제의 거동에 미치는 영향에 대한 고찰)

  • Lee, Ji-Eun;Lee, Myeong-Sok;Jeong, Hyuk
    • Analytical Science and Technology
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    • v.14 no.4
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    • pp.356-363
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    • 2001
  • A basic study of the effect of the SDS on the behavior of the anionic surfact in electrophoresis was performed. Having been interacted with SDS micelle, long chain carboxylates and sulfonates which have more than 10 carbons have been suffered larger changes in their apparent mobilities. Based on the result of the comparison among apparent, electroosmotic and electrophoretic mobilities, it is demonstrated that the major cause for the variation of the apparent mobilities of the anions is the variation of the electrophoretic mobilities.

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Walking along Seoul City Wall as Therapeutic Mobilities (치유적 모빌리티로서 서울 한양도성길 걷기)

  • Park, Hyanggi
    • Journal of the Korean Geographical Society
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    • v.51 no.1
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    • pp.109-125
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    • 2016
  • Human life has been inextricably linked with healing. Recently, as the demands of healing are higher, it is more necessary to study spaces, places and mobilities related to healing in geographical studies. This paper draws on a case study of urban peoples walks along Seoul City Wall to explore what healing factors affect the people walking along historical landscapes in urban center and understand geographical implications of the healing process. Based on the concept and analytical lens of 'therapeutic mobilities' introduced by Gatrell, this research analyzes texts written on 181 blogs. The results show the main factors that affect their healing are 'weather climate', 'walk stroll', and 'nightscape'. Futhermore, the blogs' narratives focusing on these main factors imply healing place-making, time as limiting factor, and the social body within nightscape in the healing process.

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Dependence of Hole Mobilities on the Growth Direction and Strain Condition in $Si_{1-x}Ge_x$ Layers Grown on $Si_{1-y}Ge_y$ Substrate ($Si_{1-y}Ge_y$ 위에 성장시킨 $Si_{1-x}Ge_x$ 에서 성장방향과 응력변형 조건에 따른 정공의 이동도 연구)

  • 전상국
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.11 no.4
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    • pp.267-273
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    • 1998
  • The band structures of $Si_{1-x}Ge_x$ layers grown on $Si_{1-y}Ge_y$ substrate are calculated using k$\cdot$p and strain Hamiltonians. The hole drift mobilities in the plane direction are then calculated by taking into account the screening effect and the density-of-states of the impurity band. When $Si_{1-x}Ge_x$ is grown on Si substrate, the mobilities of (110) and (111) $Si_{1-x}Ge_x$ layers are larger than that of (001) $Si_{1-x}Ge_x$. However, due to the large defect and surface scattering, (110) and (111) $Si_{1-x}Ge_x$ layers may not be useful for the development of the fast device. Meanwhile, when Si is grown on $Si_{1-y}Ge_y$ substrate, the mobilities of (001) and (110) Si layers are greatly enhanced. Based on the amount of defect and the surface scattering, it is expected that Si grown on (001) $Si_{1-y}Ge_y$ substrate, where the Ge contents is larger than 10%(y>0.1), has the highest mobility.

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Studies on the Paper Electrophoresis, I On the Mobility of Egg Albumin(Ovalbumin) (페이퍼 에레크트로포레시스에 關한 硏究 (제1보) 계란단백의 移動度에 關하여)

  • Chang, Sei-Hun;Kim, Si-Joong
    • Journal of the Korean Chemical Society
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    • v.4 no.1
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    • pp.1-6
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    • 1957
  • The mobilities and the electrophoretic phenomena of human serum albumin, and of horse serum albumin, etc., on paper were reported, but there is no information about the mobility and the electrophoretic phenomena of ovalbumin. In this study they are determined and considered at various time durations. The mean value of this mobility is compared with the value determined by the electrophoresis in solution. Also, the mobilities of the electroendosmotic flow, which affect on the mobility seriously, are determined at various time durations. Apparatus and method used, are a closed system type and a method with electrode vessels. It is concluded that: 1) The mobilities of ovalbumin have the nearly constant mobilities at six and eight hours of time durations, but it decreases at ten hours of long time duration. Their mean value is (0.243 ${\pm}$ 0.003)cm./hr./v./cm. toward anode at pH 8.0. 2) Under these experimental conditions, ovalbumin cannot be separated into three fractions (A1, A2, A3) on paper. 3) Most of the factors, which affect on the mobility, are fixed by the initial experimental conditions, but the electroendosmotic flow due to the characteristic capillarity of paper is measured. Then, the mean value of its mobilities shows the good constancy, and the value is (0.073 ${\pm}$ 0.0003)cm/hr./v./cm. toward cathode at pH 8.0. 4) By the above facts, if the same paper and the same experimental conditions are chosen, it may be preferred to determine the mobility of the electroendosmotic flow once time, even when many observations are required.

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Charge Transport in Uniaxially Aligned Liquid-crystalline Polymer Transistors

  • Lee, Mi-Jeong;Chen, Zhuoying;Sirringhaus, H.;Lee, Jang-Sik
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2011.10a
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    • pp.27.2-27.2
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    • 2011
  • Polymer electronics is the one of the most promising way to realize the flexible electronics and many studies made remarkable progress to achieve the improvement in performance of polymer electronics comparable to current silicon-based technology. PBTTT is conjugated semiconducting polymer with highly ordered, chain-extended crystalline microstructures and shows high field effect mobilities above 0.1 $cm^2/Vs$. We studied PBTTTs FETs phase and explored methods to control channel interface in various device structures. Especially, in PBTTTs' unique nano-ribbon phase, we could obtain high mobilities of up to 0.4 $cm^2/Vs$, which was not reached before. Alignment of PBTTTs film was carried out using zone casting and anisotropy of mobilities in parallel and perpendicular to the polymer chain direction was investigated. Optical anisotropy in aligned nano-ribbon PBTTT FETs was also studied using a polarized optical absorption.

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