• Title/Summary/Keyword: Coarse-to-Fine

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Long Range and High Axial Load Capacity Nanopositioner Using Single Piezoelectric Actuator and Translating Supports

  • Juluri, Bala Krishna;Lin, Wu;Lim, Lennie E N
    • International Journal of Precision Engineering and Manufacturing
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    • v.8 no.4
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    • pp.3-9
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    • 2007
  • Existing long range piezoelectric motors with friction based transmission mechanisms are limited by the axial load capacity. To overcome this problem, a new linear piezoelectric motor using one piezoelectric actuator combined with a novel stepping mechanism is reported in this paper. To obtain both long range and fine accuracy, dual positioning control strategy consisting of coarse positioning and fine positioning is used. Coarse positioning is used for long travel range by accumulating motion steps obtained by piezoelectric actuator. This is followed by fine positioning where required accuracy is obtained by fine motion displacement of piezoelectric actuator. This prototype is able to provide resolution of 20 nanometers and withstand a maximum axial load of 300N. At maximum load condition, the positioner can move forward to a travel distance of 5mm at a maximum speed of 0.4 mm/sec. This design of nanopositioner can be used in applications for ultra precision positioning and grinding operations where high axial force capacity is required.

Evaluation on the Mechanical Performance of Low-Quality Recycled Aggregate Through Interface Enhancement Between Cement Matrix and Coarse Aggregate by Surface Modification Technology

  • Choi, Heesup;Choi, Hyeonggil;Lim, Myungkwan;Inoue, Masumi;Kitagaki, Ryoma;Noguchi, Takafumi
    • International Journal of Concrete Structures and Materials
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    • v.10 no.1
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    • pp.87-97
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    • 2016
  • In this study, a quantitative review was performed on the mechanical performance, permeation resistance of concrete, and durability of surface-modified coarse aggregates (SMCA) produced using low-quality recycled coarse aggregates, the surface of which was modified using a fine inorganic powder. The shear bond strength was first measured experimentally and the interface between the SMCA and the cement matrix was observed with field-emission scanning electron microscopy. The results showed that a reinforcement of the interfacial transition zone (ITZ), a weak part of the concrete, by coating the surface of the original coarse aggregate with surface-modification material, can help suppress the occurrence of microcracks and improve the mechanical performance of the aggregate. Also, the use of low-quality recycled coarse aggregates, the surfaces of which were modified using inorganic materials, resulted in improved strength, permeability, and durability of concrete. These results are thought to be due to the enhanced adhesion between the recycled coarse aggregates and the cement matrix, which resulted from the improved ITZ in the interface between a coarse aggregate and the cement matrix.

A Design of DLL(Delay-Locked-Loop) with Low Power & High Speed locking Algorithm (저전력과 고속 록킹 알고리즘을 갖는 DLL(Delay-Locked LooP) 설계)

  • 경영자;이광희;손상희
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.26 no.12C
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    • pp.255-260
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    • 2001
  • This paper describes the design of the Register Controlled DLL(Delay-Locked Loop) that achieves fast locking and low Power consumption using a new locking algorithm. A fashion for a fast locking speed is that controls the two controller in sequence. The up/down signal due to clock skew between a internal and a external clock in phase detector, first adjusts a large phase difference in coarse controller and then adjusts a small phase difference in fine controller. A way for a low power consumption is that only operates one controller at once. Moreover the proposed DLL shows better jitter performance Because using the lock indicator circuit. The proposed DLL circuit is operated from 50MHz to 200MHz by SPICE simulation. The estimated power dissipation is 15mA at 200MHz in 3.3V operation. The locking time is within 7 cycle at all of operating frequency.

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Leaching Behavior of LD Slag

  • Kim, Hyung-Suek;Han, Ki-Hyun;M. S. Oh;Byeon, Tae-Bong
    • Proceedings of the IEEK Conference
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    • 2001.10a
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    • pp.526-531
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    • 2001
  • LD slag, that is, a by-product of steel making process, has been mainly used as land construction materials. Recently, the seashore application of LD slag was tried in Japan and Korea tut the reaction between LD slag and seawater was not studied yet. We tried to clarify the leaching reaction and/or mechanism of LD slag and the reaction between seawater and LD slag. We tried to apply these results to the decarbonization of seawater for seawater magnesia process. At first, LD slag was milled and classified into 5 grades, that is, (ⅰ)45${\mu}{\textrm}{m}$ under, (ⅱ)0.25~0.5mm (ⅲ)0.5~1mm(ⅳ)1~2mm, (ⅴ)2.36~3.35mm. These slags were leached in the distilled water. In case of 45${\mu}{\textrm}{m}$ under, the pH of the leached solution was over 12. The chemical analysis of leached solution showed that the $Ca^{+}$$^2$was main component and the S $i^{+}$$^4$was very low. On the other hand, the content of S $i^{+}$$^4$in leached solution was decreased with the increase of pH of this solution. The nearly pure calcium solution was made and the ultra high purity MgO could be made with this calcium solution. The leaching behavior of LD slag was different between the fine particle and coarse particle. The calcium was leached by bulk dissolution in the coarse particle and by surface controlled reaction in fine particle. The leaching rate was slow in coarse particle and fast in fine particle. Therefore, the high pH solution, that is, over 12, was obtained in fine particle.cle.e.

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Roadside Aerosols Size Distribution Characteristics in Jeju City (제주시 도로변에서의 에어로졸의 입경별 분포 특성)

  • Lee, Ki-Ho;Kim, Su-Mi;Hu, Chul-Goo
    • Journal of Environmental Science International
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    • v.30 no.9
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    • pp.727-739
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    • 2021
  • Measurements on mass size distribution of roadside aerosols were obtained in downtown Jeju City from July 2018 to May 2020 using an 8-stage cascade impactor sampler and the compositions of aerosols were analyzed. The mass size distribution of total aerosols was bimodal with aerosols existing in both the fine and coarse modes. The mass size distributions of Na+, Mg2+, Ca2+, Cl-, NH4+ and SO42- were unimodal, whereas that of K+ was bimodal. For NO3-, the size distribution in winter and spring was bimodal with the peaks in both fine and coarse modes, whereas for summer and autumn the distribution was unimodal with a peak in the coarse mode. NH4+ was found to co-exist with SO42- in the fine mode with an average molar ratio of [NH4+]/[SO42-] equal to 2.05. Good correlation was observed between NO3- and NH4+ in the fine mode particles in spring and winter. Based on the value of the marine enrichment factor for Cl-, Mg2+, K+, Ca2+ and SO42-, it may be inferred that a major part of the roadside aerosols in downtown Jeju City was largely contributed by terrigenous sources, although the influence of sea salt was normally present.

Residual Mechanical Properties of Ultra High Strength Concrete with Aggregate Factor (골재요인에 따른 초고강도 콘크리트의 잔존역학적 특성)

  • Lee, Hee-Kwang;Kim, Gyu-Yong;Lee, Tae-Gyu;Nam, Jeong-Soo;Koo, Kyung-Mo;Youn, Yong-Sang
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.11a
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    • pp.211-212
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    • 2011
  • It was very important to evaluate concrete experimentally at elevated temperature because concrete was filled with aggregate of concrete volume about 70 percent. Concrete exposure to high temperatures produces changes in its internal structure, for instance loss of its strength and deformation capacity, in extreme cases risking the service life of the structure. The work of this paper is performed to evaluate the thermal behavior of ultra-high strength concrete having different water to cement ratio (strength), fine aggregate to aggregate ratio and maximum size of coarse aggregate. For exposure to 500℃ during 1 hour, residual mechanical properties of the ultra-high strength concrete decreased as the s/a ratio decreases and the maximum size of coarse aggregate increases.

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Rare earth element geochemistry of shelf sediments in the western part of Jeju Island, korea

  • Youn, Jeung-Su;Kim, Tae-Joung
    • 한국지구과학회:학술대회논문집
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    • 2010.04a
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    • pp.58-58
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    • 2010
  • The sediment geochemistry, including REE of surface and core samples in the western part off Jeju Island have been carried out in order to understand the provenance and hydrolic sorting. The sediment in the study area were primarily composed of coarse silt with a mean grain size of $2.8{\sim}82.8{\mu}m$. The ratios of TOC over total nitrogen (TN) showed that the study area sediments contained more organic matters of marine origin than those of terrigenous origin. The total A1203, Fe203, K20, MgO, and MnO contents and REE concentration of the fine sediments are higher than those of the coarse sediments. The higher Zr/Th and Zr/Yb ratios in coarse sediments relative to fine-grained detritus indicates sedimentary sorting. Grain size influence the REE concentrations of the study area sediment significantly. The < $63{\mu}m$ fraction of the sediment has higher REE concentration and different REE patterns when compared with those in bulk samples, due to the presence of REE-enrich heavy minerals. The REE distribution patterns of the western part of Jeju Island sediments are relatively enriched in most LREEs than the Yellow River sediment and depleted in the Changjiang River, but the LaN/YbN ratios are similar to the Changjiang sediment. The Eu/Eu* ratios ranged from 0.594~0.665(0.631) is much similar to the Yellow River sediment, possibly mixture of the sediments from these two rivers.

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The Effects of TiN Particles on the HAZ Microstructure and Toughness in High Nitrogen TiN Steel

  • Jeong, H.C.;An, Y.H.;Choo, W.Y.
    • International Journal of Korean Welding Society
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    • v.2 no.1
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    • pp.25-28
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    • 2002
  • In the coarse grain HAZ adjacent to the fusion line, most of the TiN particles in conventional Ti added steel are dissolved and austenite grain growth is easily occurred during welding process. To avoid this difficulty, thermal stability of TiN particle is improved by increasing the nitrogen content in steel. In this study, the effect of hlgh nitrogen TiN particle on preventing austenite grain growth in HAZ was investigated. Increased thermal stability of TiN particle is helpful for preventing the austenite grain growth by pinning effect. High nitrogen TiN particle in simulated HAZ were not dissolved even at high temperature such as 1400'E and prevented the austenite grain growth in simulated HAZ. Owing to small austenite grain size in HAZ the width of coarse grain HAZ in high nitrogen TiN steel was decreased to 1/10 of conventional TiN steel. Even high heat input welding, the microstructure of coarse grain HAZ consisted of fine polygonal ferrite and pearlite and toughness of coarse grain HAZ was significantly improved.

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Fast Locking FLL (Frequency Locked Loop) For High - speed Wireline Transceiver (고속 locking time을 갖는 Frequency Locked Loop(FLL))

  • Song, Min-Young;Lee, In-Ho;Kwak, Young-Ho;Kim, Chul-Woo
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.509-510
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    • 2006
  • FLL (Frequency Locked Loop) is the core block for high-speed transceiver. It incorporates a PLL for fine locking action, and a coarse controller for coarse locking action. A coarse controller compares frequencies coarsely and is applied to detected frequency difference directly. Compare to conventional FLL, frequency is applied to proposed FLL. Proposed FLL in this paper achieves only 5 cycles for coarse lock and total frequency locking time is 5 times faster than conventional FLL. Thus, proposed FLL is more useful to Ethernet transceiver application that requires high-speed data transfer than conventional FLL. Proposed FLL is based on $0.18{\mu}m$ process.

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An Experimental Study on Mechanical Properties of Ductile Concrete with the Kinds of Aggregate (골재종류에 따른 고인성 콘크리트의 역학적 특성에 관한 실험적 연구)

  • Han Byung-chan;Yang Il-seung;Park Wan-shin;Lim Seung-chan;Morii Naoharu;Youn Hyun-do
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05b
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    • pp.61-64
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    • 2005
  • Concrete is one of the principal materials for the structure and it is widely used all over the world, but it shows extremely brittle failure under bending and tensile load. Recently to improve such a poor property, Ductile Fiber Reinforced Cementitious Composites (DFRCC) have been developed, and it are defined by an ultimate strength higher than their first cracking strength and the formation of multiple cracking during the inelastic deformation process. This paper is to estimate experimentally the mechanical properties of ductile concrete with the kinds of used fine and coarse aggregate for purpose of development of high ductile concrete mixing coarse aggregate. As the results, ductile concrete mixed coarse aggregate showed the displacement-hardening behavior under bending load similar to DFRCC, and its compressive and bending performance varied according to the kinds of used coarse aggregate.

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