Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Yong-Kyu Cho"'
Autor:
Ki-Hyeok Song, Yong-Kyu Cho, Byung-Chan Kim, Dong-Seong Kang, Myeong-Woo Cho, Jong-Su Kim, Byung-So Ryu
Publikováno v:
Journal of the Korea Academia-Industrial cooperation Society. 16:5748-5755
Scribing is cutting process to determine production amount and characteristic of LED chip. So it is an important process for fabrication of LED chip. Mechanical process and conventional scribing process with laser sourcehas several problems such as t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a949406bb8dc56845f5430bcc988de2d
https://doi.org/10.5762/kais.2015.16.9.5748
https://doi.org/10.5762/kais.2015.16.9.5748
Autor:
Kwang-Pyo Hong, Yong-Kyu Cho, Byung-Min Kim, Myeong-Woo Cho, In-Cheol Lee, Jung-Won Lee, Seok-Jae Ha
Publikováno v:
Journal of the Korean Society of Manufacturing Process Engineers. 14:36-42
The aspherical lens was designed to be able to array a focal point. For this reason, it has very curved surface. The aspherical lens is fabricated by injection molding or diamond turning machine. With the aspherical lens, tool marks and surface rough
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9871d2068c3620b41dd84f9446e85144
https://doi.org/10.14775/ksmpe.2015.14.3.036
https://doi.org/10.14775/ksmpe.2015.14.3.036
Publikováno v:
Journal of Mechanical Science and Technology. 29:2205-2211
Abrasive fluid jet polishing processes have been used for the polishing of optical surfaces with complex shapes. However, unstable and unpredictable polishing spots can be generated due to the fundamental property of an abrasive fluid jet that it beg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::128664c30c9976be32dc96e0bd4aea60
https://doi.org/10.1007/s12206-015-0136-8
https://doi.org/10.1007/s12206-015-0136-8
Publikováno v:
Journal of Applied Mathematics and Physics. :208-217
Nitinol is used in various industries, especially for biomaterials. Generally, the surface integrity of sub-micron level and non-surface flaw is required in nitinol for biomaterial. However, surface flaws, such as scratches, pits, and residual stress
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bb8bef9db6d92e63122c9e2aa734e1bd
https://doi.org/10.4236/jamp.2015.32031
https://doi.org/10.4236/jamp.2015.32031
Autor:
Jong-Su Kim, Sun Min Kim, Myeong-Woo Cho, Yong-Kyu Cho, Jung-Won Lee, Taeheon Han, Seok-Jae Ha
Publikováno v:
International Journal of Precision Engineering and Manufacturing. 15:1417-1422
We developed a maskless lithography system using a digital micromirror device (DMD). This system incorporates a light-emitting diode (LED) driver to generate ultraviolet (UV) light, illumination optics using a fly-eye lens, and telecentric projection
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::082f15e8ed334592d65c889877e97d28
https://doi.org/10.1007/s12541-014-0485-8
https://doi.org/10.1007/s12541-014-0485-8
Publikováno v:
Journal of the Korean Society of Manufacturing Process Engineers. 13:92-99
An aspherical lens, which resolves several problems with a spherical lens,typically serves asa key part of an optical system. Generally, an aspherical lens is fabricated using a diamond turning machine or by mean of injection molding. However, residu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0274c6581b08a620eba67943846941bc
https://doi.org/10.14775/ksmpe.2014.13.1.092
https://doi.org/10.14775/ksmpe.2014.13.1.092
Publikováno v:
Journal of the Korea Academia-Industrial cooperation Society. 14:2624-2630
In LED chip packaging, die bonding is a very important process which fixes the LED chip on the lead flame to provide enough strength for the next process. During the process, inspection processes are very important to detect exact locations of dispen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c7227dd2765d30383f84889082cc36f
https://doi.org/10.5762/kais.2013.14.6.2624
https://doi.org/10.5762/kais.2013.14.6.2624
Publikováno v:
International Journal of Precision Engineering and Manufacturing. 13:1925-1930
An ultra-precision polishing method using magnetorheological (MR) fluids is applied to the powder blasted micro channels fabricated on fused silica glass to improve surface quality and recover optical transmittance. For the experiments, 300 μm micro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::15f2f1000c2752596e898e9bf39fb751
https://doi.org/10.1007/s12541-012-0254-5
https://doi.org/10.1007/s12541-012-0254-5
Publikováno v:
Journal of manufacturing engineering & technology. 21:767-772
Generally, abrasive fluid jet polishing system has been used for polishing of complex shape or freeform surface which has steep local slopes. In the system, abrasive fluid jet is injected through a nozzle at high pressure; however, it is inevitable t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c4afec6b2e2a9a46af2e0e2855021936
https://doi.org/10.7735/ksmte.2012.21.5.767
https://doi.org/10.7735/ksmte.2012.21.5.767
Autor:
Seung-Bok Choi, Won-Seung Cho, Myeong-Woo Cho, Bong-Cheol Shin, Jae-Jin Jae, Kwang-Pyo Hong, Yong-Kyu Cho
Publikováno v:
Materials and Manufacturing Processes. 27:1135-1138
In this study, ultraprecise polishing of alumina reinforced zirconia ceramics using magneto rheological (MR) fluids and diamond abrasives was investigated. First, alumina-reinforced zirconia composites, containing 0 to 30 vol% alumina, were fabricate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ba1bd31e4a6ba2a608173d247561d7bd
https://doi.org/10.1080/10426914.2011.654155
https://doi.org/10.1080/10426914.2011.654155