Browsing by Author "Wu, Po-Hsun"

Now showing 1 - 4 of 4

A Novel Analog Physical Synthesis Methodology Integrating Existent Design Expertise
(2015-02-01)
Wu, Po-Hsun
;
Lin, Mark Po-Hung
;
Chen, Tung-Chieh
;
Yeh, Ching-Feng
;
Li, Xin
Analog layout design has been a manual, time-consuming, and error-prone task for decades. To speed up layout design time for a new design, analog layout designers prefer referring to legacy designs and layouts rather than starting from scratch, or thoroughly applying placement and routing tools because legacy layouts contain pretty much design expertise. Motivated by such layout design process, this paper presents the first knowledge-based physical synthesis methodology to generate new layouts by integrating existent design expertise. The proposed approach can automatically analyze legacy design data including circuits, layouts, and constraints, extract matched sub-circuits between new and legacy designs, and generate multiple layouts for the new design by utilizing the quality-approved legacy layouts as much as possible. Experimental results show that the proposed methodology can achieve high layout reusage rate, and hence the designers\' layout preference can be successfully reserved.
Analog Layout Synthesis with Knowledge Mining
(2015)
Wu, Po-Hsun
;
Lin, Mark Po-Hung
;
Ho, Tsung-Yi
;
資訊工程學系
;
Department of Computer Science
To reduce layout design time, analog layout designers prefer referring to legacy designs and layouts rather than starting from scratch, or thoroughly applying placement and routing tools because legacy layouts contain pretty much design expertise. Therefore, this paper presents the first knowledge-based layout synthesis methodology to generate new layouts by integrating existent design expertise contained in the quality-approved legacy layouts as much as possible. Experimental results show that the proposed methodology with knowledge mining can achieve high layout reusage rate and hence the designers\' layout preference can be successfully reserved.
Auto-focus pathology microscope using sub-array sampling
(2019-01-01)
Wu, Po-Hsun
;
Weng, Chun-Jen
;
Chen, Pi-Ying
;
機械工程學系
;
Department of Mechanical Engineering
this study compared the focusing results of binning and sub-array methods with the aim of balancing speed and accuracy. Analysis was conducted using an autofocus system comprising a microscope, CCD, PZT actuator, LED light source, and two focus algorithms. Our results showed that by selecting an image sub-array of appropriate size and shape, it was possible to reduce the time required for autofocus operations to only 1 second, while maintaining the focusing accuracy of full-field analysis techniques.
Negative circular polarization emissions from WSe2/MoSe2 commensurate heterobilayers
(2018-04-10)
Hsu, Wei-Ting
;
Lu, Li-Syuan
;
Wu, Po-Hsun
;
Lee, Ming-Hao
;
Chen, Peng-Jen
Van der Waals heterobilayers of transition metal dichalcogenides with spin-valley coupling of carriers in different layers have emerged as a new platform for exploring spin/valleytronic applications. The interlayer coupling was predicted to exhibit subtle changes with the interlayer atomic registry. Manually stacked heterobilayers, however, are incommensurate with the inevitable interlayer twist and/or lattice mismatch, where the properties associated with atomic registry are difficult to access by optical means. Here, we unveil the distinct polarization properties of valley-specific interlayer excitons using epitaxially grown, commensurate WSe2/MoSe2 heterobilayers with well-defined (AA and AB) atomic registry. We observe circularly polarized photoluminescence from interlayer excitons, but with a helicity opposite to the optical excitation. The negative circular polarization arises from the quantum interference imposed by interlayer atomic registry, giving rise to distinct polarization selection rules for interlayer excitons. Using selective excitation schemes, we demonstrate the optical addressability for interlayer excitons with different valley configurations and polarization helicities.