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NPRportrait 1.0:A three-level benchmark for non-photorealistic rendering of portraits

Computational Visual Media 2022年第3期8卷 445-465页

作者： Paul L.Rosin Yu-Kun Lai david mould Ran Yi Itamar Berger Lars Doyle Seungyong Lee Chuan Li Yong-Jin Liu Amir Semmo Ariel Shamir Minjung Son Holger Winnemöller School of Computer Science and Informatics Cardiff UniversityCardiffUK School of Computer Science Carleton UniversityOttawaCanada Department of Computer Science and Technology Tsinghua UniversityBeijingChina Reichman University(the Interdisciplinary Center) HerzliyaIsrael Department of Computer Science and Engineering Pohang University of Science and TechnologyPohangRepublic of Korea Lambda Labs Inc.San FranciscoUSA Hasso Plattner Institute University of PotsdamPotsdamGermany Multimedia Processing Laboratory Samsung Advanced Institute of TechnologySuwonRepublic of Korea Adobe Systems Inc.San JoseUSA

Recently,there has been an upsurge of activity in image-based non-photorealistic rendering(NPR),and in particular portrait image stylisation,due to the advent of neural style transfer(NST).However,the state of performance evaluation in this field is poor,especially compared to the norms in the computer vision and machine learning communities.Unfortunately,the task of evaluating image stylisation is thus far not well defined,since it involves subjective,perceptual,and aesthetic aspects.To make progress towards a solution,this paper proposes a new structured,threelevel,benchmark dataset for the evaluation of stylised portrait images.Rigorous criteria were used for its construction,and its consistency was validated by user studies.Moreover,a new methodology has been developed for evaluating portrait stylisation algorithms,which makes use of the different benchmark levels as well as annotations provided by user studies regarding the characteristics of the faces.We perform evaluation for a wide variety of image stylisation methods(both portrait-specific and general purpose,and also both traditional NPR approaches and NST)using the new benchmark dataset.

关键词： non-photorealistic rendering(NPR) image stylization style transfer portrait evaluation benchmark

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Automated pebble mosaic stylization of images

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Computational Visual Media 2019年第1期5卷 33-44页

作者： Lars Doyle Forest Anderson Ehren Choy david mould Carleton University

Digital mosaics have usually used regular tiles, simulating historical tessellated mosaics. In this paper, we present a method for synthesizing pebble mosaics, a historical mosaic style in which the tiles are rounded pebbles. We address both the tiling problem,of distributing pebbles over the image plane so as to approximate the input image content, and the problem of geometry, creating a smooth rounded shape for each pebble. We adopt simple linear iterative clustering(SLIC)to obtain elongated tiles conforming to image content,and smooth the resulting irregular shapes into shapes resembling pebble cross-sections. Then, we create an interior and exterior contour for each pebble and solve a Laplace equation over the region between them to obtain height-field geometry. The resulting pebble set approximates the input image while representing full geometry that can be rendered and textured for a highly detailed representation of a pebble mosaic.

关键词： non-photorealistic rendering digital mosaics image stylization segmentation image processing

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A review of the origin of equiaxed grains during solidification under mechanical stirring,vibration,electromagnetic,electric-current,and ultrasonic treatments

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Journal of Materials Science & Technology 2023年第13期144卷 243-265页

作者： Nagasivamuni Balasubramani Jeffrey Venezuela david StJohn Gui Wang Matthew Dargusch Centre for Advanced Materials Processing and Manufacturing(AMPAM) School of Mechanical and Mining EngineeringUniversity of QueenslandSt.LuciaQLD 4072Australia

Refinement of grains and intermetallic phases in the as-solidified alloy structure offers uniform struc-tural properties,eliminates or minimizes common solidification defects,including segregation and hot cracking,and improves thermomechanical processing of wrought alloys.Melt processing by an external field is an efficient process for achieving refinement of the solidification structure of Al and Mg alloys without altering the alloy composition.A wide range of melt processing methods and solidification stud-ies(conventional,directional,and in-situ approaches)have been reported in the literature that explore the mechanism of refinement.Identifying the dominant grain refinement mechanism has been a focus of most investigations because significant variations exist according to the casting conditions and the type of applied external treatments.The origin of fine grains occurs through either one or a combination of heterogenous nucleation,fragmentation of dendrites and grains formed and then separated from the surface of the melt and mould wall under vibration or agitation.The first part of this review describes the prominent external field techniques and the mechanisms proposed for the origin of fine grains.The second part critically compares the current understanding of these grain refinement mechanisms to de-termine differences and commonalities to identify the factors that promote the formation of equiaxed zones occupying a large volume fraction of the casting.

关键词： Grain refinement Solidification Melt processing Equiaxed grains Intermetallic refinement

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Current understanding of the origin of equiaxed grains in pure metals during ultrasonic solidification and a comparison of grain formation processes with low frequency vibration,pulsed magnetic and electric-current pulse techniques

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Journal of Materials Science & Technology 2021年第6期65卷 38-53页

作者： Nagasivamuni Balasubramani Gui Wang david H.St John Matthew S.Dargusch Centre for Advanced Materials Processing and Manufacturing(AMPAM) School of Mechanical and Mining EngineeringUniversity of QueenslandSt Lucia

The formation of fine,non-dendritic equiaxed grains throughout a casting without the addition of refiners(i.***.independent of alloy chemistry),is made possible by using ultrasonic,magnetic or pulsed magnetic and electric current pulse techniques.The dominant mechanisms proposed for the grain refinement produced during the application of an external field are cavitation phenomena assisted nucleation or fragmentation of dendrites(ultrasonic field),wall crystals arising from the cold surface of the mould(electric current pulse,magnetic and pulsed magnetic fields).In all these cases fluid flow provides an additional contribution(e.***.reduced temperature gradients,growth rate and remelting of dendrites)to maintaining an equiaxed grain structure.The origin of equiaxed grains under an external field also depends on the casting conditions(volume and shape of casting)and the type of alloy other than the mechanisms specific to a particular technique.The current work aims to provide a detailed understanding of the various factors and mechanisms that influence the grain refinement achieved during the solidification of pure metals(magnesium and zinc)subjected to Ultra Sonic Treatment(UST).The role of the temperature range of UST application,time duration and an unpreheated sonotrode are examined with respect to the origin,evolution of equiaxed grain structure,morphology and the columnar to equiaxed transition.The origin of grains was analysed from three fundamental aspects that contribute to refinement(i)heterogeneous nucleation(ii)fragmentation of existing dendrites and(iii)grains produced from the colder surfaces(arising from mould walls or vibrating surfaces as wall crystals).A comparison of UST refinement with mechanical,low-frequency vibration,electric current pulse and magnetic field solidification of pure metals has also been provided to highlight the importance of the cold surfaces(sonotrode and mould wall)in influencing grain refinement.

关键词： Ultrasonic treatment Grain refinement Equiaxed grains Magnesium Zinc Solidification

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Progress and perspective of high strain NBT-based lead-free piezoceramics and multilayer actuators

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Journal of Materiomics 2021年第3期7卷 508-544页

作者： Pengyuan Fan Kai Liu Weigang Ma Hua Tan Qi Zhang Ling Zhang Changrong Zhou david Salamon Shan-Tao Zhang Yangjun Zhang Bo Nan Haibo Zhang School of Materials Science and Engineering State Key Laboratory of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan430074PR China School of Materials Science and Engineering University of New South WalesSydney2052Australia School of Mechanical and Electrical Engineering Shihezi UniversityShiheziChina College of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin541004PR China Central European Institute of Technology(CEITEC)Brno University of Technology Czech Republic National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringCollege of Engineering and Applied ScienceCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China State Key Laboratory of Automotive Safety and Energy School of Vehicle and MobilityTsinghua UniversityBeijing100084PR China Guangdong HUST Industrial Technology Research Institute Dongguan523808PR China

In this review,the evolution of high strain Na_(0.5)Bi_(0.5)TiO_(3)-based lead-free piezoceramics and their multilayer actuators has been explored.First,in terms of Na_(0.5)Bi_(0.5)TiO_(3)-based ceramic materials,the origin of high strain,the typical chemical modification methods of obtaining large strain and extrinsic factors affecting the large strain are discussed.Then it briefly summarizes the problems existing in Na_(0.5)Bi_(0.5)TiO_(3)-based ceramics for multilayer actuator applications.Strategies to optimize strain performance by means of microstructure control and phase structure design are also discussed.Thereafter,in terms of multilayer actuator,we describe its characteristics,applications and preparation process systematically,as well as the recent development of Na_(0.5)Bi_(0.5)TiO_(3)-based multilayer actuator.At last,perspectives on directions of following work and promising fields for the applications of the materials and their devices are presented.

关键词： Lead-free piezoceramics Bismuth sodium titanate Electric-field-induced strain Multilayer actuators

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A REACTIVE APPROACH TO INTEGRATION OF PROCESS PLANNING AND SCHEDULING FOR MTO mould-MAKING SME

A REACTIVE APPROACH TO INTEGRATION OF PROCESS PLANNING AND S...

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第七届海内外青年设计与制造科学会议

作者： Hall david School of Engineering University of HuddersfieldUK

＜正＞Targeting to the problems in the state of the art approaches to integration of process planning and scheduling, an shop floor data collection （SFDC） driven reactive approach to process planning is proposed which is based on the visualization of manufacturing resources to minimise or eliminate the uncertainties and improve the responsiveness to unpredictable disturbances in the make-to-order （MTO） mould-making small-to-medium enterprises （SMEs）. The solution model is established and validated through a serial experiment under different testing conditions. The results show that compared with highly automatic process planning, the proposed reactive approach is more practical and effective way in industry, especially for SMEs MTO environment.

关键词： SFDC Reactive Planning and Scheduling MTO SMEs.

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Sphaeria ericophila的命名、分类、分子系统发育和Metacapnodium属分类地位的意义

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菌物研究 2020年第4期18卷 235-245页

作者： david L.Hawksworth Carlos G.Boluda Comparative Plant and Fungal Biology Royal Botanic GardensKewSurreyTW93DSUK Department of Life Sciences The Natural History MuseumCromwell RoadLondon SW15BDIJK Jilin Agricultural University Changchun 130118China Unite de Phylogenie et Genetique moleculaires Conservatoire et Jardin botaniquesGeneva 1292 ChambesySwitzerland

1809年,Link在伊比利亚的高山欧石楠Erica arborea上发现了黑煤病(sooty mould),经鉴定将其命名为Sphaeria ericophila,最近有学者在葡萄牙和西班牙都再次采集到S.ericophila,通过对其候选模式和附加模式的研究,发现该菌在形态上与Metac... 详细信息

1809年,Link在伊比利亚的高山欧石楠Erica arborea上发现了黑煤病(sooty mould),经鉴定将其命名为Sphaeria ericophila,最近有学者在葡萄牙和西班牙都再次采集到S.ericophila,通过对其候选模式和附加模式的研究,发现该菌在形态上与Metacapnodium属的模式种M.juniperi最为接近,同时在2013年与M.ericophilum合并成同一个属。通过ITS测序得到3个样品的序列,结果表明该菌属于散囊菌纲Eurotiomycetes而非座囊菌纲Dothideomycetes,并且最接近于褐球壳目Phaeomoniellales/刺盾炱目Chaetothyriales。本文报道了Metacapnodium的首条序列,并表明另一份黑煤病(sooty mould)样本不属于煤炱目Capnodiales,而是属于刺盾炱目Chaetothyriales s.lat.。自Huges在1970年研究Link的名称应用以来就引入了真菌命名法起始日期的变化,以及放弃了同一物种的不同形态的命名,从而解决了命名问题。如前文所述,现已证实Metacapnodium包含Antennullaria,其中Sphoeria enicophila为模式物种。M.ericophilum非专性寄生,在西班牙,它不仅在刺柏属Juniperus植物上寄生,也会严重感染高山欧石楠Erica arborea还可能感染其他欧石楠属植物,如E.australalis,但在非洲东部山区的欧石楠属植物上可能还存在该属Metacapnodium的其他致病菌。

关键词：煤炱目刺盾炱目 Hughes(人名) M.ericophilum 分子系统发育命名法褐球壳目模式

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控制浇注法制备半固态坯料的研究

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哈尔滨理工大学学报 2005年第3期10卷 4-6,10页

作者：宁志良刘殿魁 WANG Hao STJOHN david 哈尔滨工程大学建筑工程学院黑龙江哈尔滨150001哈尔滨理工大学材料科学与工程学院黑龙江哈尔滨150080 哈尔滨理工大学材料科学与工程学院黑龙江哈尔滨150080 昆士兰大学治金矿业材料系澳大利亚圣鲁西亚QLD4072

针对半固态成形中需要具有细小颗粒均匀分布的非枝晶坯料以获得流变特性,采用控制形核的方法,制备了具有触变特性的半固态坯料.亚共晶Al—Si合金以不同的浇注温度浇注到永久模中,随着浇注温度的增加,晶粒尺寸和形状成柱状晶的趋势增加.... 详细信息

针对半固态成形中需要具有细小颗粒均匀分布的非枝晶坯料以获得流变特性,采用控制形核的方法,制备了具有触变特性的半固态坯料.亚共晶Al—Si合金以不同的浇注温度浇注到永久模中,随着浇注温度的增加,晶粒尺寸和形状成柱状晶的趋势增加.带有金属丝网的试验表明,低温浇注时型壁形核机理起重要作用.675℃以下浇注时,型壁形核的生存率决定了最终结构, 包括晶粒尺寸和形貌;浇注温度高于675℃时,其他的形核机理起决定作用.

关键词：半固态铸造触变结构 Al—Si合金

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使用专用电加工机床的柔性

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模具技术 1989年第3期 70-71页

作者： david coole 李子康

许多公司为了利润,在使用电加工机床时忽视了模具和电极加工,以及与此相关的操作专用电加工机床的必要的柔性。应用传统定位方法加工模具和电极,操作电加工机床的公司只利用了机床的专用性能。他们不懂得用电加工工具系统的定位精度将... 详细信息

许多公司为了利润,在使用电加工机床时忽视了模具和电极加工,以及与此相关的操作专用电加工机床的必要的柔性。应用传统定位方法加工模具和电极,操作电加工机床的公司只利用了机床的专用性能。他们不懂得用电加工工具系统的定位精度将超出机床的范围。

关键词：模具加工机床电加工设备

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采用镀层模具提高玻璃成形操作性能

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模具技术 1991年第6期 85-86页

作者： david J.Sugg 王凤森

采用镀层的玻璃模具有许多好处。镀层的释放特性好,可减少裂纹;能提高耐磨损性能和耐腐蚀性能,从而延长模具或压模芯的使用寿命。采用镀层,就为使用不同的模具材料和压模芯材料创造了条件,从而降低材料成本或使模具制造更为简易。镀层... 详细信息

采用镀层的玻璃模具有许多好处。镀层的释放特性好,可减少裂纹;能提高耐磨损性能和耐腐蚀性能,从而延长模具或压模芯的使用寿命。采用镀层,就为使用不同的模具材料和压模芯材料创造了条件,从而降低材料成本或使模具制造更为简易。镀层材料主要有两种,一种是硬铬,一种是化学镀镍。首先探讨一下它们的物理特性。 1.硬铬电镀从历史上看,最常用的玻璃模具镀层是硬铬,即工程铬电镀。通常,硬铬镀层由铬酸水溶液形成,加入硫酸或氟硅酸作为催化剂。涂镀在高温下进行。

关键词：镀层模具玻璃成形

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