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Leveraging on few-shot learning for tire pattern classification in forensics

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Journal of Automation and Intelligence 2023年第3期2卷 146-151页

作者： Lijun Jiang Syed Ariff Syed Hesham Keng Pang Lim Changyun Wen School of Engineering Republic PolytechnicSingapore Maschine Technology pte.ltd Singapore School of Electrical&Electronic Engineering Nanyang Technological UniversitySingapore

This paper presents a novel approach for tire-pattern classification,aimed at conducting forensic analysis on tire marks discovered at crime *** classification model proposed in this study accounts for the intricate and dynamic nature of tire prints found in real-world scenarios,including accident *** address this complexity,the classifier model was developed to harness the meta-learning capabilities of few-shot learning algorithms(learning-to-learn).The model is meticulously designed and optimized to effectively classify both tire patterns exhibited on wheels and tire-indentation marks visible on surfaces due to *** is achieved by employing a semantic segmentation model to extract the tire pattern marks within the *** marks are subsequently used as a mask channel,combined with the original image,and fed into the classifier to perform ***,The proposed model follows a three-step process:(i)the Bilateral Segmentation Network is employed to derive the semantic segmentation of the tire pattern within a given image.(ii)utilizing the semantic image in conjunction with the original image,the model learns and clusters groups to generate vectors that define the relative position of the image in the test set.(iii)the model performs predictions based on these learned *** verification demonstrates usage of semantic model to extract the tire patterns before performing classification increases the overall accuracy of classification by∼4%.

关键词： Meta-learning Few-shot classification Semantic segmentation

Resolving Coeluting and Trace-level GC/LC-MS Components with Band-target Entropy Minimization

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Resolving Coeluting and Trace-level GC/LC-MS Components with...

学术出版的最佳实践：ISMTE首届亚洲会议综述(Ⅱ)

2018年中国质谱学术大会（CMSC2018）

作者： Chun Kiang Chua Yunbo Lv Ai Di Thng Hua Jun Zhang Chemopower Technology pte.ltd.

GC-MS and LC-MS are increasingly important analytical technique for the separation and identification of chemicals in complex mixtures. The analysis of complex mixtures is often challenging as the coelution of two or more components often leads to overlapping chromatographic peaks. Various instrumental and experimental modification sought to address this concern, but a one-fit-all solution is still non-existent. This has thus spurred the development of computational approaches to extract pure component signals from overlapping chromatographic peaks. Herein, we demonstrate the deconvolution and reconstruction of pure components and mass spectra from overlapping peaks based on a band-target entropy minimization algorithm. Our approach computes extrema from raw mass spectra to provide accurate qualitative and quantitative analyses in overlapping peaks without the need for any a priori information. Moreover, mass spectra of trace-level components can be recovered with significant signal-to-noise enhancement. We demonstrate the application of our approach in several case studies including the analysis of rose essential oil, eucalyptus oil, ginseng extract and pesticides etc. The pure mass spectra of overlapping and trace-level components were accurately recovered leading to high confidence annotations. Our approach surpasses common mass spectral processing software for overlapping peaks. The integration of our approach into GC-MS and LC-MS technique is a significant step forward towards the development of a rapid and high-throughput chemical analysis.

关键词： GC-MS LC-MS Chemometric Deconvolution

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编辑学报 2017年第1期29卷 96-100页

作者：汪旭婷付国乐张昕颜帅 SAGE Publications Asia Pacific pte ltd. 新加坡049483 清华大学出版社期刊中心北京100084

《学术出版的最佳实践:ISMTE首届亚洲会议综述(Ⅰ)》介绍了ISMTE新加坡会议的出版伦理道德、开放获取、出版数据监测等3个会议议题;本文针对此次会议的其余诸如行业协会资源、出版技术和平台、出版实践新标准、投审稿系统、作者服务、... 详细信息

《学术出版的最佳实践:ISMTE首届亚洲会议综述(Ⅰ)》介绍了ISMTE新加坡会议的出版伦理道德、开放获取、出版数据监测等3个会议议题;本文针对此次会议的其余诸如行业协会资源、出版技术和平台、出版实践新标准、投审稿系统、作者服务、编辑部运作等6个会议议题进行总结和分析,期望对国内学术期刊的发展运行、即将召开的ISMTE 2017北京会议提供参考和借鉴。

关键词：学术出版行业协会资源数字出版技术和平台 CRediT ORCID 投审稿系统作者服务编辑部运作

Numerical study on maximum rebound ratio in blasting wave propagation along radian direction normal to joints

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Journal of Central South University of Technology 2006年第6期13卷 743-748页

作者：雷卫东滕军 HEFNY A 赵坚关炯 Department of Urban and Civil Engineering Shenzhen Graduate School Harbin Institute of Technology School of Civil and Environmental Engineering Nanyang Technological University Ecole Polytechnique Federale de Lausanne (EPFL) Rock Mechanics Laboratory Lausanne CH-1015 Switzerland College of Architecture and Civil Engineering China University of Mining and Technology Xuzhou 221008 China Kvaerner E&C Singapore pte. ltd. Aker Kvaerner Asia Pacific

In the process of 2-D compressional wave propagation in a rock mass with multiple parallel joints along the radian direction normal to the joints, the maximum possible wave amplitude corresponding to the points between the two adjacent joints in the joint set is controlled by superposition of the multiple transmitted and the reflected waves, measured by the maximum rebound ratio. Parametric studies on the maximum rebound ratio along the radian direction normal to the joints were performed in universal distinct element code. The results show that the maximum rebound ratio is influenced by three factors, i.e., the normalized normal stiffness of joints, the ratio of joint spacing to wavelength and the joint from which the wave rebounds. The relationship between the maximum rebound ratio and the influence factors is generalized into five charts. Those charts can be used as the prediction model for estimating the maximum rebound ratio.

关键词： 2-D compressional wave maximum rebound ratio stiffness of joint

Design optimization of a slotless PM brushless motor with helical edge wound laminations for rim driven thrusters

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High Technology Letters 2010年第1期16卷 70-79页

作者： Sharkh S M Lai S H School of Engineering Sciences University of Southampton Highfield Southampton SO17 1BJ UK Applied Materials South East Asia pte ltd Changi Business Park Vista 486051 Singapore

This paper discusses the analysis and design of a very thin slotless permanent magnet （PM） brushless motor whose stator laminations are manufactured from a single strip of steel that is edge wound into a spiral （like a ＂Slinky＂） and then fitted over the windings that are preformed on the outside surface of a non-conducting former. Analytical and finite element analysis （FEA） are used to determine the con- strained optimum dimensions of a motor used to drive a rim driven thruster in which the motor rotor is fit- ted onto the rim of the propeller and the stator is encapsulated in the thin Kort nozzle of the thruster. The paper describes the fabrication of a demonstrator motor and presents experimental results to validate the theoretical calculations. Experimental motor performance results are also reported and compared with those of a slotted motor that fits within the same active radial dimensions as the slotless motor. The slotless motor, which has longer active length and endwindings, and thicker magnets than the slotted motor, was found to be less efficient and more expensive （prototype cost） than the slotted machine.

关键词： slotless brushless permanent magnet (PM) motor edge-wound laminations rim driven thruster

Optimal Secondary Control of Islanded AC Microgrids with Communication Time-delay Based on Multi-agent Deep Reinforcement Learning

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CSEE Journal of Power and Energy Systems 2023年第4期9卷 1301-1311页

作者： Yang Xia Yan Xu Yu Wang Suman Mondal Souvik Dasgupta Amit.K.Gupta the School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore Rolls-Royce@NTU Corporate Lab Nanyang Technological UniversitySingaporeand now is with the School of Electrical EngineeringChongqing University Rolls-Royce Singapore pte.ltd.Singapore Rolls-Royce Solutions GmbH Germany

In this paper,an optimal secondary control strategy is proposed for islanded AC microgrids considering communi-cation *** proposed method is designed based on the data-driven principle,which consists of an offine training phase and online application *** offline training,each control agent is formulated by a deep neural network(DNN)and trained based on a multi-agent deep reinforcement learning(MA-DRL)framework.A deep deterministic policy gradient(DDPG)algorithm is improved and applied to search for an optimal policy of the secondary control,where a global cost function is developed to evaluate the overall control *** addition,the communication time-delay is introduced in the system to enrich training scenarios,which aims to solve the time-delay problem in the secondary *** the online stage,each controller is deployed in a distributed way which only requires local and neighboring information for each *** on this,the well-trained controllers can provide optimal solutions under load variations,and communication time-delays for online *** case studies are conducted to validate the feasibility and stability of the proposed secondary *** Terms-Communication time-delay,global cost function,islanded AC microgrid,multi-agent deep reinforcement learning(MA-DRL),secondary control.

关键词： Communication time-delay global cost function islanded AC microgrid multi-agent deep reinforcement learning(MA-DRL) secondary control.

Crumb Rubber Modified Bitumen in Open Graded Wearing Course of Flexible Pavement

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Open Journal of Civil Engineering 2017年第2期7卷 165-176页

作者： Moe Aung Lwin Handojo Djati Utomo Samwoh R&D Centre Samwoh Corporation Pte Ltd. Singapore City Singapore School of Architecture and the Built Environment Civil Engineering Singapore Polytechnic Singapore City Singapore

Rapid road infrastructure development due to an increasing demand of car users resulted in an increase in paved areas including road sites and suppression of green spaces. An integrated solution that can support a country’s economic development without compromising water pollution is becoming inevitable. Recycling tyres in the form of crumb rubber tyres and mixing it into bituminous paving mixture can increase the recycling rate and minimize cost of incineration process. In dry mixing process, five (5) different variations of Open Graded Wearing (OGW) course road samples were made to make up 1.15 kg in each sample. Each OGW mix contained 4% - 6% bitumen Pen 60/ 70 and fixed 1% of crumb rubber tyres, making the percentage of crumb rubber tyres 14% - 20% of bituminous samples. Bitumen Pen 60/70 mixed with 20% crumb rubber tyres content met the PG 76 bitumen properties. Physical properties of OGW made from crumb rubber modified bitumen (CRMB) were better than standard bitumen only. In a separate water leachate test using ICP-OES equipment, heavy metal leachate of Cu(II), Pb(II), Zn(II) and Cd(II) were present in all OGW CRMB samples at increasing surrounding water temperature from 25℃ to 60℃. However all the heavy metal concentration was very low below the allowable limit of trade effluent standards into water course.

关键词： Crumb Rubber Modified Bitumen (CRMB) Heavy Metal Leachate Open Graded Wearing Course (OGW) Water Pollution

Cumulus-specific genes are transcriptionally silent following somatic cell nuclear transfer in a mouse model

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第8期8卷 533-539页

作者： TONG Guo-qing HENG Boon-chin NG Soon-chye Nuclear Reprogramming and Stem Cell Laboratory Department of Obstetrics and Gynecology Yong Loo Lin School of Medicine National University of Singapore 119074 Singapore Stem Cell and Developmental Biology Group Genome Institute of Singapore 138672 Singapore Stem Cell Laboratory Faculty of Dentistry National University of Singapore 119074 Singapore Embryonics International pte ltd. Gleneagles Hospital 258500 Singapore

This study investigated whether four cumulus-specific genes: follicular stimulating hormone receptor (FSHr), hyaluronan synthase 2 (Has2), prostaglandin synthase 2 (Ptgs2) and steroidogenic acute regulator protein (Star), were correctly reprogrammed to be transcriptionally silent following somatic cell nuclear transfer (SCNT) in a murine model. Cumulus cells of C57×CBA F1 female mouse were injected into enucleated oocytes, followed by activation in 10 μmol/L strontium chloride for 5 h and subsequent in vitro culture up to the blastocyst stage. Expression of cumulus-specific genes in SCNT-derived embryos at 2-cell, 4-cell and day 4.5 blastocyst stages was compared with corresponding in vivo fertilized embryos by real-time PCR. It was demonstrated that immediately after the first cell cycle, SCNT-derived 2-cell stage embryos did not express all four cumulus-specific genes, which continually remained silent at the 4-cell and blastocyst stages. It is therefore concluded that all four cumulus-specific genes were correctly reprogrammed to be silent following nuclear transfer with cumulus donor cells in the mouse model. This would imply that the poor preimplantation developmental competence of SCNT embryos derived from cumulus cells is due to incomplete reprogramming of other embryonic genes, rather than cumulus-specific genes.

关键词： Somatic cell nuclear transfer (SCNT) Nuclear reprogramming Embryo Development

纳米压痕技术的测量原理及其在材料科学中的应用

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纳米压痕技术的测量原理及其在材料科学中的应用