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Minwoo Jeon,Seok-Kyeong Jeong,Jong-Gyun Kang,Woo-Jong Yeo,Young-Jae Kim,Hwan-Jin Choi,Wonkyun Lee 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.11
In the optical manufacturing industry, magnetorheological finishing (MRF) is widely known as a deterministic process because of its subsurface damage removal performance and high-level performance of figure correction. However, similar to other optical manufacturing methods that belong to computer-controlled polishing, MRF faces the edge effect, in which the workpiece edge is rolled up or down. As the edge effect lowers the performance of optical components, it should be improved to ensure the final performance of the optical system. In this study, the edge tool influence function (TIF) obtained when the normal TIF was suspended from the workpiece edge was analyzed, and the distortion of the TIF occurring at the edge was explained. The edge TIFs with different overhang distances and polishing parameters, such as step height of raster scan path and swipe speed of TIF, were combined to present a new mathematical model for predicting the edge effect occurring after MRF. To verify the feasibility of the proposed prediction model, the edge effect generated by the uniform polishing of the entire surface of the electroless nickel was compared and analyzed with the edge effect predicted by the proposed model. The relative error of the edge effect generated according to the polishing conditions and the edge effect predicted using the proposed model was calculated to be 4–7%, and the validity of the proposed model was experimentally verified.
Exploiting Thread-Level Parallelism on HEVC by Employing a Reference Dependency Graph
Minwoo Kim,Deokho Kim,Kyungah Kim,Won Woo Ro Institute of Electrical and Electronics Engineers 2016 IEEE transactions on circuits and systems for vide Vol.26 No.4
<P>This paper presents an optimized parallel algorithm for the next-generation video codec High Efficiency Video Coding (HEVC). The proposed method provides maximized parallel scalability by exploiting two levels of parallelism: 1) frame level and 2) task level. Frame-level parallelism is exploited using a graph that efficiently provides a parallel coding order of the frames with complex reference dependencies. The proposed reference dependency graph is generated at runtime by a novel construction algorithm that dynamically analyzes the configuration of the HEVC codec. Task-level parallelism is exploited to provide further scalability to frame-level parallelization. A pipelined execution is allowed for independent tasks, which are defined by dividing and categorizing a single coding process into multiple types of tasks. The proposed parallel encoder and decoder do not suffer from loss in coding efficiency because neither constraints nor modification in coding options are required. The proposed parallel methods result in an average encoding speedup of 1.75 and the aggressive method that exploits additional frame-level parallelism achieved 6.52 speedup using eight physical cores.</P>
Noh, Minwoo,Mok, Yeongbong,Lee, Seonju,Kim, Heejin,Lee, So Hyun,Jin, Geun-woo,Seo, Ji-Hun,Koo, Heebeom,Park, Tae Ha,Lee, Yan The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.32
<P>Osmosis can be controlled reversibly and effectively by mild temperature changes based on novel thermosensitive solutes with LCST transition. The <I>n</I>Bu-TAEA thermosensitive solution can draw fresh water from seawater at temperatures less than the phase separation temperature, and the osmotic flow was reversed at higher temperatures.</P> <P>Graphic Abstract</P><P>Osmosis can be controlled reversibly and effectively by mild temperature changes based on thermosensitive solutes with LCST transition. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc30890h'> </P>