• Title/Summary/Keyword: 5-axis Stage

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THIRD MOLAR CHANGES FOLLOWING LOWER SECOND MOLAR EXTRACTIONS (하악 제2대구치의 발치후 제3대구치의 변화에 관한 연구)

  • Hong, Soon Chang;Ryu, Young Kyu
    • The korean journal of orthodontics
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    • v.17 no.2
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    • pp.321-333
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    • 1987
  • The purpose of this study was to observe the changes of the lower 3rd molars following the extraction of the lower 2nd molars by Lateral Cephalograms and Orthopantomograms. The subjects consisted of twenty malocclusion, 7 males 13 females, were 19 year 5 month old at the removal of the lower 2nd molars, 19 year 1 month old at the end of the orthodontic supervision after the removal of the lower 2nd molars (mean age) The obtained results were as follows, 1 It is recommended to extract the lower 2nd molars when the lower 3rd molars are Nolla's Stage 4 or 5 2 With the pre-extraction variables obtained by factor analysis, it was possible to predict the long axis of the lower 3rd molars after 2nd molar extraction. 3 There were no impacted 3rd molars.

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Epitaxial Growth of BSCCO Type Structure in Atomic Layer by Layer Deposition

  • Yang, Sung-Ho;Park, Yong-Pil;Jang, Kyung-Uk;Oh, Geum-Gon;Lee, Joon-Ung
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2000.11a
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    • pp.97-100
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    • 2000
  • Si$_2$Sr$_2$CuO$\sub$x/(Bi(2201)) thin films are fabricated by atomic layer by layer deposition using ion beam sputtering(IBS) method. During the deposition, 10 %-ozone/oxygen mixture gas of typical 5.0 ${\times}$ 10$\^$-5/ Torr is applied with ultraviolet light irradiation for oxidation. XRD and RHEED investigations reveal out that a buffer layer with some different compositions is formed at the early deposition stage of less than 10 units cell and then c-axis oriented Bi(2201) is grown.

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Epitaxial Growth of BSCCO Thin film Fabricated by Layer-by-layer Sputtering

  • Yang, Sung-Ho;Park, Yong-Pil;Lee, Hee-Kab
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.212-217
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    • 2000
  • Bi$_2$Sr$_2$CuO$_{x}$(Bi-2201) thin films have been fabricated by atomic layer-by-layer deposition using ion beam sputtering(IBS) process. During the deposition, 14 wt%-ozone/oxygen mixture gas of typical pressure of 5.0$\times$10$^{-5}$ Torr is supplied with ultraviolet light irradiation for oxidation. XRD and RHEED investigations reveal that a buffer layer with compositions different from Bi-2201 is formed at the early deposition stage of less than 10 units cell and then Bi-2201 oriented along the c-axis is grown.n.

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Layer-by-layer Deposition of BSCCO Thin Films Using Ion Beam Sputtering Method (이온 빔 스퍼터법에 의한 BSCCO 박막의 순차 증착)

  • 박용필;이준웅
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.11 no.4
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    • pp.334-339
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    • 1998
  • $Bi_2Sr_2CuO_x$(Bi-2201) thin films have been fabricated by atomic layer-by-layer deposition using ion beam sputtering (IBS) method. During the deposition, 14 wt%-ozone/oxygen mixture gas of typical pressure of $5.0\times10^{-5}$ Torr is supplied with ultraviolent light irradiation for oxidation. XRD and RHEED investigations reveal that a buffer layer with compositions different from Bi-2201 is formed at the early deposition stage of less than 10 units cell and then Bi-2201 oriented along the c-axis is grown.

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Epitaxial Growth of BSCCO Type Structure in Atomic Layer by Layer Deposition

  • Yang, Sung-Ho;Park, Yong-Pil;Jang, Kyung-Uk;Oh, Geum-Gon;Lee, Joon-Ung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.11a
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    • pp.97-100
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    • 2000
  • Bi$_2$Sr$_2$CuO$\sub$x/(Bi(2201)) thin films are fabricated by atomic layer by layer deposition using ion beam sputtering(IBS) method. During the deposition, 10 %-ozone/oxygen mixture gas of typical 5.0 ${\times}$ 10$\^$-5/. Torr is applied with ultraviolet light irradiation for oxidation. XRD and RHEED investigations reveal out that a buffer layer with some different compositions is formed at the early deposition stage of less than 10 units cell and then c-axis oriented Bi(2201) is grown.

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Analysis of Pregnancy-Associated Plasma Protein-A (PAPP-A) in Porcine Neonatal Testis (미성숙 돼지 정소 내에서의 pregnancy-associated plasma protein-A 특성 분석)

  • Lee, W.Y.;Cho, K.H.;Yeo, J.M.;Shin, Y.K.;Park, J.K.
    • Journal of Practical Agriculture & Fisheries Research
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    • v.22 no.1
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    • pp.5-13
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    • 2020
  • The identify of biomarkers in living tissues is useful to understand the characteristics and functions of the cells. Proteins such as protein gene product 9.5, promyelocytic leukemia zinc finger, NANOG, and stage-specific embryonic antigen-1 have been identified as markers for porcine undifferentiated spermatogonia. In this study, the expression of insulin-like growth factor binding proteins (IGFBPs), a newly discovered porcine spermatogonia marker and pregnancy-associated plasma protein-A (PAPP-A), a protein regulator of IGFBPs, were characterized in 5-day-old porcine testis. To analyze the function of IGFBPs, RT-PCR was performed. IGFBP 2, 3, 4, and 6 were detected in porcine spermatogonia and PAPP-A was detected in basement regions in 5day old porcine seminiferous tubules. PAPP-A was not expressed in spermatogonia, but it was expressed in Sertoli cells. These results suggest that the expression of PAPP-A protein in Sertoli cells may regulate the development and differentiation of testicular cells through the IGF axis in porcine neonatal testis.

KrF 엑시머 레이저를 이용한 웨이퍼 스텝퍼의 제작 및 성능분석

  • 이종현;최부연;김도훈;장원익;이용일;이진효
    • Korean Journal of Optics and Photonics
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    • v.4 no.1
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    • pp.15-21
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    • 1993
  • This paper describes the design and development of a KrF excimer laser stepper and discusses the detailed system parameters and characterization data obtained from the performance test. We have developed a deep UV step-and-repeat system, operating at 248 nm, by retrofitting a commercial modules such as KrF excimer laser, precision wafer stage and fused silica illumination and 5X projection optics of numerical aperture 0.42. What we have developed, to the basic structure, are wafer alignment optics, reticle alignment system, autofocusing/leveling mechanisms and environment chamber. Finally, all these subsystem were integrated under the control of microprocessor-based controllers and computer. The wafer alignment system comprises the OFF-AXIS and the TTL alignment. The OFF-AXIS alignment system was realized with two kinds of optics. One is the magnification system with the image processing technique and the other is He-Ne laser diffraction type system using the alignment grating on the wafer. 'The TTL alignment system employs a dual beam inteferometric method, which takes advantages of higher diffraction efficiency compared with other TTL type alignment systems. As the results, alignment accuracy for OFF-AXIS and TTL alignment system were obtained within 0.1 $\mu\textrm{m}$/ 3 $\sigma$ for the various substrate on the wafers. The wafer focusing and leveling system is modified version of the conventional systems using position sensitive detectors (PSD). This type of detection method showed focusing and leveling accuracies of about $\pm$ 0.1 $\mu\textrm{m}$ and $\pm$ 0.5 arcsec, respectively. From the CD measurement, we obtained 0.4 $\mu\textrm{m}$ resolution features over the full field with routine use, and 0.3 $\mu\textrm{m}$ resolution was attainable under more strict conditions.

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Development of Core Technologies of Multi-tasking Machine Tools for Machining Highly Precision Large Parts (고정밀 대형 부품가공용 복합가공기 원천기술 개발)

  • Jang, Sung-Hyun;Choi, Young-Hyu;Kim, Soo-Tae;An, Ho-Sang;Choi, Hag-Bong;Hong, Jong-Seung
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.2
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    • pp.129-138
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    • 2012
  • In this study, three types of large scale multi-tasking machine tools together with core technologies involved have been developed and introduced; a multi-tasking machine tool for large scale marine engine crankshafts, a multi-tasking vertical lathe for windmill parts, and a large scale 5-axis machine tool of gantry type. Several special purpose devices has been necessarily developed for the purpose of handling and machining big and heavy workpieces accurately, such as PTD (Pin Turning Device) with revolving ring spindle for machining eccentric crankshaft pins, hydrostatic rotary table and steady rest for supporting and resting heavy workpieces, and 2-axis automatic swiveling head for high-quality free surface machining. Core technologies have been also developed and adopted on their detail design stage; 1) structural design optimization with FEM structural analysis, 2) theoretical hydrostatic analysis for the PTD and rotary table bearings, 3) box-in-box type cross-rail and octagonal ram design to secure machine rigidity and accuracy, 4) constant spindle rpm control against gravitational torque due to unbalanced workpiece.

Constitutional Classification between Tae-eumin and Soyangin Types by Measurement of the Friction Coefficient on the Skin of the Human Hand (손등 피부 마찰계수를 이용한 태음인과 소양인 간의 체질구별)

  • Song, Han-Wook;Park, Yon-Kyu
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.47 no.5
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    • pp.52-61
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    • 2010
  • The use of the friction coefficient is known to provide good discrimination ability in the classification of human constitutions, which are used in alternative medicine. In this study, a system that uses a multi-axis load cell and a hemi-circular probe is designed. The equipment consists of a sensor (load cell type, manufactured by the authors), an x-axis linear-bush guide motorized mobile stage that supports the hand being analyzed, and a signal conditioner. Using the proposed system, the friction coefficients from different constitutions were compared, and the relative repeatability error for the friction coefficient measurement was determined to be less than 2 %. The direction along the ring finger line was determined to be the optimum measurement region for a constitutional diagnosis between Tae-eumin and Soyangin types using the proposed system. There were some differences in the friction coefficient between the two constitutions, as reported in ancient literature. The proposed system is applicable to a quantitative constitutional diagnosis between Tae-eumin and Soyangin types within an acceptable level of uncertainty.

march5 Governs the Convergence and Extension Movement for Organization of the Telencephalon and Diencephalon in Zebrafish Embryos

  • Jung, Jangham;Choi, Issac;Ro, Hyunju;Huh, Tae-Lin;Choe, Joonho;Rhee, Myungchull
    • Molecules and Cells
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    • v.43 no.1
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    • pp.76-85
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    • 2020
  • MARCH5 is a RING finger E3 ligase involved in mitochondrial integrity, cellular protein homeostasis, and the regulation of mitochondrial fusion and fission. To determine the function of MARCH5 during development, we assessed transcript expression in zebrafish embryos. We found that march5 transcripts were of maternal origin and evenly distributed at the 1-cell stage, except for the mid-blastula transition, with expression predominantly in the developing central nervous system at later stages of embryogenesis. Overexpression of march5 impaired convergent extension movement during gastrulation, resulting in reduced patterning along the dorsoventral axis and alterations in the ventral cell types. Overexpression and knockdown of march5 disrupted the organization of the developing telencephalon and diencephalon. Lastly, we found that the transcription of march5 was tightly regulated by the transcriptional regulators CHOP, C/EBPα, Staf, Znf143a, and Znf76. These results demonstrate the essential role of March5 in the development of zebrafish embryos.