• Title, Summary, Keyword: self-assembly

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A Research on the Assembly of the Camera Modules for Mobile Phones (휴대폰용 카메라 모듈의 조립에 대한 연구)

  • Choi J.S.;Lee G.S.;Lim D.H.;Song J.Y.;Lee C.W.;Kwak Y.G.;Kim S.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.989-992
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    • 2005
  • This paper is about the assembly of camera modules for mobile phones. We have particularly researched the assembly process proper for mega-pixel lens assemblies in the camera modules. Herein, we propose that self-adjustment function makes it possible to assemble these lens assemblies without fraction of components. In advance, we observed the assembly process of the lens assemblies to verify the possibility, and checked out it through experiments based on some assumptions.

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A Molecular Dynamics Simulation on the Self-assembly of ABC Triblock Copolymers.3. Effects of Block Composition in Asymmetric Triblock Copolymers

  • Ko, Min-Jae;Kim, Seung-Hyun;Jo, Won-Ho
    • Fibers and Polymers
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    • v.4 no.1
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    • pp.15-19
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    • 2003
  • The self-assembly of asymmetric ABC triblock copolymers in the ordered structure is investigated using an isothermal-isobaric molecular dynamics simulation. Unlike symmetric A BC triblock copolymers, more fascinating mophologies are observed in asymmetric ones because of a larger difference of incompatibility between the components. Various modes of self-assembly in assymmetric ABC triblock copolymers are also observed depending on the block composition. When the composition of block A Is changed from 0.125: to 0.25 at the same $f_B$ : 0.25, the morphological transition from the “cylinder in cylinder” to “cylinders at cylinder” structure is observed in the simulation. In the case of ABC triblocks with $f_B$=0.5, a lamellar-type structure is changed to a cylinder-type structure with increasing the length of block A. When the midblock length increases further to $f_B$=0.625, the “spheres on cylinder” structure is observed in both the $A_{10}$$B_{50}$$C_{20}$ and $A_{20}$$B_{50}$$C_{10}$ triblocks. From these results, the phase diagram of ABC triblock copolymers can be constructed.

Thermal Conductivity and Adhesion Properties of Thermally Conductive Pressure-Sensitive Adhesives

  • Kim, Jin-Kon;Kim, Jong-Won;Kim, Myung-Im;Song, Min-Seok
    • Macromolecular research
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    • v.14 no.5
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    • pp.517-523
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    • 2006
  • The effects of particle content, size and shape on the thermal conductivity (k) and adhesion properties of thermally conductive, pressure-sensitive adhesives (PSAs) were investigated. The matrix resins were thermally crosslinkable, 2-ethylhexyl acrylic polyol and ultraviolet (UV)-curable, random copolymer consisting of acrylic oligomer and various acrylates. We found that k increased with increasing diameter and particle aspect ratio, and was further enhanced due to the reduction of the interfacial thermal barrier when the coupling agent, which increases the adhesion between particles and the matrix resin, was used. On the other hand, adhesion properties such as peel strength and tack of the thermally crosslinkable resin decreased sharply with increasing particle content. However, for UV curable resin, increased particle addition inhibited the decrease in adhesion properties.

Application of Bucket Brigades in Assembly Cells for Self Work Balancing (자율적인 밸런싱을 실현하는 Bucket Brigade 기반의 조립셀 운영방식)

  • Koo, Pyung-Hoi
    • IE interfaces
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    • v.22 no.2
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    • pp.144-152
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    • 2009
  • Assembly line has been recognized as an efficient production system in mass production. However, the recent production environment characterized as mass customization urges production managers to transform a long assembly line to a number of short assembly cells. To maximize the utilization of resources in an assembly cell, it is important to have the line balanced. This paper presents a bucket brigade-based assembly cell. Bucket brigade is a way of coordinating workers who progressively perform a set of assembly operations on a flow line. Each worker follows a simple rule: perform assembly operations on a product until the next worker downstream takes it over; then go back to the previous worker upstream to take over a new assembly job. In this way, the line balances itself. The bucket brigade assembly cell is analyzed and compared with traditional assembly lines and general assembly cells. The paper also discusses some prerequisite requirements and limitations when the bucket brigade assembly cells are employed.

Surface Modification of High Energetic Materials by Molecular Self-assembly (자기조립법을 이용한 고에너지물질의 표면개질 연구)

  • Kim, Ja-Young;Jeong, WonBok;Shin, Chae-Ho;Kim, Jin-Seok;Lee, Keundeuk;Lee, Kibong
    • Journal of the Korean Society of Propulsion Engineers
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    • v.20 no.2
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    • pp.18-23
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    • 2016
  • Self-assembly of organic molecules is formed spontaneously on surfaces by electrostatic interaction with substrate. This research has shown that the self-assembly improves safety and handling tractability of high-energetic materials (HEMs). According to the recent study, control of the specific crystal size for reducing the internal defects is mightily important, because the internal defects are a factor in unstability of HEMs. In turn, we performed self-assembly of organic molecules and HEMs by using nano-sized HEMs, which were produced by drowing-out or milling/crystallization. Surface modification efficiency was decided by size distribution, zeta-potential, friction sensitivity and electrostatic charge.

Multilayer Thin Film Fabrication of Azoaromatic Oligo-electrolyte through Electrostatic Self-assembly (정전기적 자기조립에 의한 방향족 아조 올리고머 전해질의 다층 박막 형성)

  • 안흥기;박원호;이택승
    • Textile Science and Engineering
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    • v.40 no.6
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    • pp.492-499
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    • 2003
  • An azobispyridinium-bearing oligo-electrolytes linked with flexible alkyl chain was synthesized to use as a polycation. Layer-by-layer deposition between commercially available poly(sodium 4-styrene sulfonate) and oligomeric polycation with azobispyridine groups was successfully accomplished with electrostatic self-assembly technique, which was known to be a simple and versatile method for preparing supported multilayer thin films. It was found that the multilayers from layer-by-layer deposition process on hydrophilic glass slides and PET films could be fabricated with uniform thickness according to UV-Vis spectroscopy and ellipsometry. Surface topography of multilayer thin films were investigated by monitoring three dimensional images obtained by means of atomic force microscopy.

Development of 3-Dimensional Biochip Using Magnetic Interaction and Self-Assembly (자기력과 self-assembly에 의한 3차원 바이오칩의 개발)

  • Choi, Yong-Sung;Park, Dae-Hee;Kwon, Young-Soo;Tamiya, E.
    • Proceedings of the KIEE Conference
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    • pp.1909-1911
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    • 2003
  • This research describes a new constructing method of multifunctional biosensor using many kinds of biomaterials. A metal particle and an array was fabricated by photolithographic. Biomaterials were immobilized on the metal particle. The array and the particles were mixed in a buffer solution, and were arranged by magnetic force interaction and self-assembly. A quarter of total Ni dots were covered by the particles. The binding direction of the particles was controllable, and condition of particles was almost with Au surface on top. The particles were successfully arranged on the array. The biomaterial activities were detected by chemiluminescence and electrochemical methods.

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Development of Protein Chip by Random Fluidic Self-Assembly Interaction (무작위 액중 상호 작용에 의한 단백질칩의 개발)

  • Choi, Yong-Sung;Kwon, Young-Soo;Park, Dae-Hee
    • Proceedings of the KIEE Conference
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    • pp.303-305
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    • 2003
  • In this paper, we have been proposed a new method of multichannel biosensor using random fluidic self-assembly. A metal particle and an array was fabricated. Biomaterials were immobilized on the metal particle. The array and the particles were mixed in a buffer solution, and were arranged by self-assembly. A quarter of total Ni dots were covered by the particles. The binding direction of the particles was controllable, and condition of particles was almost with Au surface on top. The particles were successfully arranged on the array. The biomaterial activities were detected by chemiluminescence.

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Development of Biochip by Magnetic Force Interaction (자기력에 의한 바이오칩의 개발)

  • Choi, Yong-Sung;Park, Dae-Hee;Kwon, Young-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.196-199
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    • 2003
  • In this paper, we have been described a new constructing method of multichannel biosensor using self-assembly by magnetic force interaction. A metal particle and an array was fabricated by photolithographic. Biomaterials were immobilized on the metal particle. The array and the particles were mixed in a buffer solution, and were arranged by magnetic force interaction and self-assembly. A quarter of total Ni dots were covered by the particles. The binding direction of the particles was controllable, and condition of particles was almost with Au surface on top. The particles were successfully arranged on the array. The biomaterial activities were detected by chemiluminescence.

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