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亚洲精密工程、微纳技术国际会议

作者： won-shik chu Sung-Geun Kim Woo-Kyun Jung Hyung-Jung Kim Sung-Hoon Ahn Friedrich B.Prinz Seoul National University Seoul 151-742 Korea Seoul National University Seoul 151-742 Korea Seoul National University Seoul 151-742 Korea Seoul National University Seoul 151-742 Korea Seoul National University Seoul 151-742 Korea Stanford University CA 94305 USA

The rapid prototyping (RP) technology has been used for design verification, functionality test and fabrication of prototypes. In this paper, a hybrid rapid prototyping system, which can fabricate nano composites using various materials is introduced. This hybrid system adopts RP and machining process, so material deposition and removal can be performed on a single station. As an example, micro gears were fabricated using nano composite consisted of photo-curable polymer and Multi-wall Carbon Nano Tube (MWCNT). The micro gear samples fabricated by the hybrid RP technology showed higher precision than those made by casting or deposition process. As the second example stapes was fabricated using hydroxyapatite-acrylic composite.

关键词： Hybrid system, Micro machining, Nano composite, Rapid Prototyping, Precision

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A Power-Aware Branch Predictor by Accessing the BTB Selectively

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Journal of Computer Science & Technology 2005年第5期20卷 607-614页

作者： Cheol Hong Kim Sung Woo chung chu shik Jhon Mobile System Laboratory Department of Electrical Engineering and Computer Science Seoul National University Seoul 151-742 Korea Department of Computer Science University of Virginia Charlottesville Virginia 22904 U.S.A.

Microarchitects should consider power consumption, together with accuracy, when designing a branch predictor, especially in embedded processors. This paper proposes a power-aware branch predictor, which is based on the gshare predictor, by accessing the BTB （Branch Target Buffer） selectively. To enable the selective access to the BTB, the PHT （Pattern History Table） in the proposed branch predictor is accessed one cycle earlier than the traditional PHT if the program is executed sequentially without branch instructions. As a side effect, two predictions from the PHT are obtained through one access to the PHT, resulting in more power savings. In the proposed branch predictor, if the previous instruction was not a branch and the prediction from the PHT is untaken, the BTB is not accessed to reduce power consumption. If the previous instruction was a branch, the BTB is always accessed, regardless of the prediction from the PHT, to prevent the additional delay/accuracy decrease. The proposed branch predictor reduces the power consumption with little hardware overhead, not incurring additional delay and never harming prediction accuracy. The simulation results show that the proposed branch predictor reduces the power consumption by 29-47%.

关键词： branch predictor BTB embedded processor low power design PHT

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Massively parallel electro-optic sampling of space-encoded optical pulses for ultrafast multi-dimensional imaging

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Light(Science & Applications) 2023年第2期12卷 304-313页

作者： Yongjin Na Hyunsoo Kwak Changmin Ahn Seung Eon Lee Woojin Lee chu-shik Kang Jungchul Lee Junho Suh Hongki Yoo Jungwon Kim Korea Advanced Institute of Science and Technology(KAIST) Daejeon 34141Korea Korea Research Institute of Standards and Science(KRISS) Daejeon 34113Korea

High-speed and high-resolution imaging of surface profiles is critical for the investigation of various structures and mechanical dynamics of micro-and nano-scale *** particular,recent emergence of various nonlinear,transient and complex mechanical dynamics,such as anharmonic vibrations in mechanical resonators,has necessitated real-time surface deformation imaging with higher axial and lateral resolutions,speed,and dynamic ***,real-time capturing of fast and complex mechanical dynamics has been challenging,and direct time-domain imaging of displacements and mechanical motions has been a missing element in studying full-field structural and dynamic ***,by exploiting the electro-optic sampling with a frequency comb,we demonstrate a line-scan time-of-flight(TOF)camera that can simultaneously measure the TOF changes of more than 1000 spatial coordinates with hundreds megapixels/s pixel-rate and sub-nanometre axial resolution over several millimetres *** unique combination of performances enables fast and precise imaging of both complex structures and dynamics in three-dimensional devices and mechanical resonators.

关键词： deformation dimensional dynamics

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