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Mechatronic Modeling and Domain Transformation of Multi-physics systems

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Instrumentation 2021年第1期8卷 14-28页

作者： clarence W.DE sILVA Department of Mechanical Engineering The University of British ColumbiaVancouverBC V6T 1Z4

The enhanced definition of Mechatronics involves the four underlying characteristics of integrated,unified,unique,and systematic *** this realm,Mechatronics is not limited to electro-mechanical systems,in the multi-physics sense,but involves other physical domains such as fluid and *** paper summarizes the mechatronic approach to *** graphs facilitate the development of state-space models of mechatronic systems,through this *** use of linear graphs in mechatronic modeling is outlined and an illustrative example of sound system modeling is *** time-domain and frequency-domain approaches are presented for the use of linear graphs.A mechatronic model of a multi-physics system may be simplified by converting all the physical domains into an equivalent single-domain system that is entirely in the output domain of the *** approach of converting(transforming)physical domains is *** illustrative example of a pressure-controlled hydraulic actuator system that operates a mechanical load is given.

关键词： Mechatronic Modeling,Multi-physics systems,Integrated,Unified,Unique and systematic Approach Linear Graphs,Physical Domain Conversion/Transformation

Concepts for sensor Matching in Mechatronic systems

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Instrumentation 2020年第3期7卷 1-14页

作者： clarence W.DE sILVA Department of Mechanical Engineering The University of British ColumbiaVancouverBC V6T 1Z4

A typical mechatronic system consists of a multitude of components,and the sensors belong to an important and crucial class of such *** matching of the system components is implicit in the current definition of a mechatronic *** focus of the present paper is the optimal matching of sensors with other hardware in the *** matching may be based on several concepts such as the operating frequency range(operating bandwidth),speed of response(and the corresponding rate of data sampling in digital conversion),the device sensitivity(or gain or data amplification),and the effect of component acc uracy on the overall accuracy of the *** present paper explores all these concepts and presents suit able approaches for sensor matching through those *** relevant procedures are illustrated using case studies.

关键词： Mechatronic systems Optimal Instrumentation sensor selection sensor Matching

Fast approximate matching of binary codes with distinctive bits

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Frontiers of Computer science 2015年第5期9卷 741-750页

作者： Chenggang clarence YAN Hongtao XIE Bing ZHANG Yanping MA Qiong DAI Yizhi LIU Institute of Information Engineering Chinese Academy of Sciences National Engineering Laboratory for Information Security Technologies Beijing 100093 China Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Department of Automation Tsinghua University Beijing 100083 China school of Physics Beijing Institute of Technology Beijing 100081 China school of Information science and Engineering Ocean University of China Qingdao 266100 China school of Computer science and Engineering Hunan University of Science and Technology Xiangtan 411201 China

Although the distance between binary codes can be computed fast in Hamming space, linear search is not practical for large scale datasets. Therefore attention has been paid to the efficiency of performing approximate nearest neighbor search, in which hierarchical clustering trees （HCT） are widely used. However, HCT select cluster centers randomly and build indexes with the entire binary code, this degrades search performance. In this paper, we first propose a new clustering algorithm, which chooses cluster centers on the basis of relative distances and uses a more homogeneous partition of the dataset than HCT has to build the hierarchical clustering trees. Then, we present an algorithm to compress binary codes by extracting distinctive bits according to the standard deviation of each bit. Consequently, a new index is proposed using compressed binary codes based on hierarchical decomposition of binary spaces. Experiments conducted on reference datasets and a dataset of one billion binary codes demonstrate the effectiveness and efficiency of our method.

关键词： binary codes approximate nearest neighbor search hierarchical clustering index

A single micro-LED manipulation system based on micro-gripper

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Nanotechnology and Precision Engineering 2024年第2期7卷 45-52页

作者： Jie Bai Pingjuan Niu Erdan Gu Jianming Li clarence Augustine TH Tee school of Mechanical Engineering Tiangong University school of Electronic and Information Engineering Tiangong University Institute of Photonics University of Strathclyde Tianjin Key Laboratory of Micro Low Gravity Environment simulation Technology Tianjin Aerospace Electromechanical Equipment Research Institute Department of Electrical and Information Engineering School of Physics and Electrical Information EngineeringZhejiang Normal University

Micro-LEDs(μLEDs) have advantages in terms of brightness, power consumption, and response speed. In addition, they can also be used as micro-sensors implanted in the body via flexible electronic skin. One of the key techniques involved in the fabrication of μLED-based devices is transfer printing. Although numerous methods have been proposed for transfer printing, improving the yield of μLED arrays is still a formidable task. In this paper, we propose a novel method for improving the yield of μLED arrays transferred by the stamping method, using an innovative design of piezoelectrically driven asymmetric micro-gripper. Traditional grippers are too large to manipulate μLEDs, and therefore two micro-sized cantilevers are added at the gripper tips. A μLED manipulation system is constructed based on the micro-gripper together with a three-dimensional positioning system. Experimental results using this system show that it can be used successfully to manipulate μLED arrays.

关键词： Micro-gripper Micro-LED Transfer printing Manipulation

Peptide photocaging:A brief account of the chemistry and biological applications

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Chinese Chemical Letters 2018年第7期29卷 1058-1062页

作者： Wing Ho so clarence T.T.Wong Jiang Xia Department of Chemistry The Chinese University of Hong Kong Hong Kong Special Administrative Region

Light is arguably the most convement non-invasive stimulant to perturb or control specinc cnemical reactions in the biological systems. Upon light illumination, photosensitive molecules incur conformational changes or formation/breaking of chemical bonds. Consequently, these molecules can be used to transfer signals from one location to another in the cell, from outside of the cell to the inside, or from a light bulb to the interior of animal tissues. The development of the photochemical reactions of organic compounds has paved the road towards their use in peptides and peptide-based biological applications. In this mini-review, we summarized the state-of-the-art development of photo-protecting groups for peptide photocaging including the un-caging mechanism of different PPGs, the synthesis of photo-caged peptides, and the recent applications of peptide photocaging in chemical biology.

关键词： Photo-protecting groups Photocaged peptides Photocaged proteins Photodecaging

Editorial for advances in slope deformation and failure analysis methods

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第10期16卷 3867-3869页

作者： Jingjing Meng Luca Piciullo clarence Choi shui-Hua Jiang school of Infrastructure Engineering Nanchang UniversityNanchangChina Norwegian Geotechnical Institute Norway The University of Hong Kong Hong KongChina

We are privileged to be invited by the Honorary Editor-in-Chief,Professor Qihu Qian,Editor-in-Chief,Professor Xia-Ting Feng,and the editorial staff of the Journal of Rock Mechanics and Geotechnical Engineering(JRMGE),to serve as Guest Editors for this special Issue(sI).In literature there have been new advancements in monitoring techniques,advanced numerical modelling,optimization algorithms,artificial intelligence and data science introduced for slope *** newly proposed approaches show great potential for improving slope design,construction,and risk assessment.

关键词： engineering. advances artificial

Debris flow impact on flexible barrier: effects of debrisbarrier stiffness and flow aspect ratio

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Journal of Mountain science 2019年第7期16卷 1629-1645页

作者： sONG Dong-ri ZHOU Gordon G.D CHOI clarence Edward ZHENG Yun Key Laboratory of Mountain Hazards and Earth surface Process/Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China University of Chinese Academy of sciences Beijing 100049China Department of Civil and Environmental Engineering Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina The HKUsT Jockey Club Institute for Advanced study Hong Kong SARChina

Conventionally,flexible barriers are rated based on their ability to resist a free-falling boulder with a particular input ***,there is still no well-accepted approach for evaluating performance of flexible barrier under debris flow *** this study,a large-nonlinear finite-element model was used to back-analyze centrifuge tests to discern the effects of impact material type,barrier stiffness,and flow aspect ratio(flow height to flow length)on the reaction force between the impacting medium and flexible *** show that,in contrast to flexible barriers for resisting rockfall,the normal impact force induced by the highly frictional and viscous debris is insensitive to barrier *** is because the elongated distributions of kinetic energy are mainly dissipated by the internal and boundary shearing,and only a small portion is forwarded to the ***,a new stiffness number is proposed to characterize the equivalent stiffness between a debris flow or a boulder,and a flexible *** the circumstance of an extremely elongated debris flow event,i.e.,low aspect ratio,the load on a barrier is dominated by the static component and thus not sensitive to the barrier stiffness.

关键词： Debris flow Flexible barrier Impact stiffness Flow aspect ratio

Discussion on the enhancement of Typhoon Committee activities for UN EW4All initiative

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Tropical Cyclone Research and Review 2024年第3期13卷 208-218页

作者： Yihong DUAN Jinping LIU clarence FONG Michael FU UNEsCAP/WMO Typhoon Committee secretariat MacaoChina

The EsCAP/WMO Typhoon Committee is an intergovernmental regional organization dealing with typhoon(tropical cyclones)related *** of people around the Asia-Pacific region remain exposed to a higher frequency and intensity of natural *** more developed countries,tropical cyclone related impacts cause major social and economic disruptions through loss of lives and *** recognizing the importance of aligning its efforts with UN Early Warnings for All(EW4All)initiative which aims to strengthen early warning systems globally,Typhoon Committee resolved to initiate the monitoring of ongoing or past efforts by TC Members in contributing to the four key pillars of the EW4all initiative aiming to(1)evaluate the Committee's contributions to EW4All;and(2)identify the opportunities for enhancing performance through Member Reports and the WGs’AOP *** had its 18th IWs/4th TRCG forum with a theme of“Early Warnings for All Through Enhancement of Typhoon standard Operating Procedures(sOP)”and“Towards a Typhoon Resilient society”;TC secretary(TCs)initiated a reviewing and monitoring on the ongoing or previous efforts of TC Members,through analyzing the AOPs’implementation of TC WGs,in contributing to the pillars of the EW4All initiative with the objective of enabling an evaluation of the Committee's contributions to EW4All and identify opportunities for further enhancing its *** paper intends to discuss the directions on how to further enhance TC activities aligning with and contribution to EW4All in future.

关键词： Early warning for all Typhoon committee Direction Enhancement

Memory bandwidth optimization of spMV on GPGPUs

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Frontiers of Computer science 2015年第3期9卷 431-441页

作者： Chenggang clarence YAN Hui YU Weizhi XU Yingping ZHANG Bochuan CHEN Zhu TIAN Yuxuan WANG Jian YIN Key Lab of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Institute of Microelectronics Tsinghua University Beijing 100084 China Automation Department Tsinghua University Beijing 100084 China state Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China state Grid Information & Communication Company of Hunan EPC Changsha 410007 China Department of Computer Shandong University Weihai 250101 China

It is an important task to improve performance for sparse matrix vector multiplication （spMV）, and it is a difficult task because of its irregular memory access. Gen- eral purpose GPU （GPGPU） provides high computing abil- ity and substantial bandwidth that cannot be fully exploited by spMV due to its irregularity. In this paper, we propose two novel methods to optimize the memory bandwidth for spMV on GPGPU. First, a new storage format is proposed to exploit memory bandwidth of GPU architecture more effi- ciently. The new storage format can ensure that there are as many non-zeros as possible in the format which is suitable to exploit the memory bandwidth of the GPU. second, we pro- pose a cache blocking method to improve the performance of spMV on GPU architecture. The sparse matrix is partitioned into sub-blocks that are stored in CsR format. With the block- ing method, the corresponding part of vector x can be reused in the GPU cache, so the time to access the global memory for vector x is reduced heavily. Experiments are carried out on three GPU platforms, GeForce 9800 GX2, GeForce GTX 480, and Tesla K40. Experimental results show that both new methods can efficiently improve the utilization of GPU mem- ory bandwidth and the performance of the GPU.

关键词： GPGPU performance tuning spMV cacheblocking memory bandwidth