To remove handwritten texts from an image of a document taken by smart phone,an intelligent removal method was proposed that combines dewarping and Fully Convolutional Network with Atrous Convolutional and Atrous Spat...To remove handwritten texts from an image of a document taken by smart phone,an intelligent removal method was proposed that combines dewarping and Fully Convolutional Network with Atrous Convolutional and Atrous Spatial Pyramid Pooling(FCN-AC-ASPP).For a picture taken by a smart phone,firstly,the image is transformed into a regular image by the dewarping algorithm.Secondly,the FCN-AC-ASPP is used to classify printed texts and handwritten texts.Lastly,handwritten texts can be removed by a simple algorithm.Experiments show that the classification accuracy of the FCN-AC-ASPP is better than FCN,DeeplabV3+,FCN-AC.For handwritten texts removal effect,the method of combining dewarping and FCN-AC-ASPP is superior to FCN-AC-ASP alone.展开更多
Classification of 3D bioprinting As we mentioned in the last editorial,3D printing,also known as additive manufacturing,could be considered as the reverse process of potato cutting,automatically assembling sliced pota...Classification of 3D bioprinting As we mentioned in the last editorial,3D printing,also known as additive manufacturing,could be considered as the reverse process of potato cutting,automatically assembling sliced potato,shredded potato,diced potato to integrity[1].Generally speaking,cell-laden 3D bioprinting can be classified into three types:extrusion-based,droplet-based and photocuring-based bioprinting according to different printing principles.Extrusion-based bioprinting squeezes out continuous hydrogel fibers to set up structures;dropletbased bioprinting generates droplets as the basic unit for biofabrication;and photocuring-based bioprinting utilizes the characteristics of light-sensitive materials,to stack 3D models layer-by-layer.Different bioprinting approaches own diverse characteristics facing various scenarios and have specific requirements for bioinks.展开更多
Introduction In recent years,three-dimensional printing(3DP),an additive manufacturing process,has gained widespread clinical application,and 3DP has been considered as the third industrial revolution.1 In its early i...Introduction In recent years,three-dimensional printing(3DP),an additive manufacturing process,has gained widespread clinical application,and 3DP has been considered as the third industrial revolution.1 In its early introduction in the 1980s,3DP served as a software-controlled technology that converted computer-aided-design(CAD)data into a physical object via a single process.By depositing multiple two-dimensional cross-sections one above the other,3DP can now be used to build arbitrarily complex geometries and patient-specific constructs using the patient’s imaging data.Till date,computed tomography has been the main imaging data source for 3DP owing to its excellent spatial resolution.Furthermore,current 3D printers have enabled bedside on-demand fabrication of medical products in hospitals.New materials including polymers,ceramics,biomaterials,and metals have been developed for such applications over the last few decades.Medical fields that employ 3DP technologies have also expanded,such as tissue engineering,regenerative medicine,pharmaceutics,and medical models and devices.2 The market for additive manufacturing is expected to surpass$20 billion in the global industry by the end of the 2020.3 Although the use of 3DP technology in interventional medicine is still relatively new,advancements are occurring within this discipline at a rapid rate.Different 3DP technologies,materials,and clinical applications relevant to the interventional field are discussed in this article.展开更多
Introduction 3D bioprinting offers a unique biofabrication platform that allows the generation of functional tissue constructs in a spatially/geometrically controlled and automated manner using a 3 D printer and bioin...Introduction 3D bioprinting offers a unique biofabrication platform that allows the generation of functional tissue constructs in a spatially/geometrically controlled and automated manner using a 3 D printer and bioink.Bioink serves as the carrier medium that provides the ideal physico-mechanical characteristics for printability,shape fidelity,and support;and a biological microenvironment for the living cells prior to,during.展开更多
It has long been a dream in the electronics industry to be able to write out electronics directly, as simply as printing a picture onto paper with an offi ce printer. The fi rstever prototype of a liquid-metal printer...It has long been a dream in the electronics industry to be able to write out electronics directly, as simply as printing a picture onto paper with an offi ce printer. The fi rstever prototype of a liquid-metal printer has been invented and demonstrated by our lab, bringing this goal a key step closer. As part of a continuous endeavor, this work is dedicated to significantly extending such technology to the consumer level by making a very practical desktop liquid-metal printer for society in the near future. Through the industrial design and technical optimization of a series of key technical issues such as working reliability, printing resolution, automatic control, human-machine interface design, software, hardware, and integration between software and hardware, a high-quality personal desktop liquid-metal printer that is ready for mass production in industry was fabricated. Its basic features and important technical mechanisms are explained in this paper, along with demonstrations of several possible consumer end-uses for making functional devices such as li ght-emitting diode(LED) displays. This liquid-metal printer is an automatic, easyto-use, and low-cost personal electronics manufacturing tool with many possible applications. This paper discusses important roles that the new machine may play for a group of emerging needs. The prospective future of this cuttingedge technology is outlined, along with a comparative interpretation of several historical printing methods. This desktop liquid-metal printer is expected to become a basic electronics manufacturing tool for a wide variety of emerging practices in the academic realm, in industry, and in education as well as for individual end-users in the near future.展开更多
THERE is a 3D printing lab in the First Ward Zone of the Department of Orthopedics at Peking University Third Hospital（PUTH）.Although not big,it’s where Professor Liu Zhongjun,director of the department,spends most...THERE is a 3D printing lab in the First Ward Zone of the Department of Orthopedics at Peking University Third Hospital（PUTH）.Although not big,it’s where Professor Liu Zhongjun,director of the department,spends most of his time,when not dealing with patients and students.展开更多
Goller Textilmaschinen GmbH, the leading manufacturer of wet finishing ranges for textile industry and also a Member of the Fong’s Group, presented new technology and equipments to the public at Shanghai
Imagine if it were possible to create 3D objects in the palm of your hand within seconds using only a single photonic chip.Although 3D printing has revolutionized the way we create in nearly every aspect of modern soc...Imagine if it were possible to create 3D objects in the palm of your hand within seconds using only a single photonic chip.Although 3D printing has revolutionized the way we create in nearly every aspect of modern society,current 3D printers rely on large and complex mechanical systems to enable layer-by-layer addition of material.This limits print speed,resolution,portability,form factor,and material complexity.Although there have been recent efforts in developing novel photocuring-based 3D printers that utilize light to transform matter from liquid resins to solid objects using advanced methods,they remain reliant on bulky and complex mechanical systems.To address these limitations,we combine the fields of silicon photonics and photochemistry to propose the first chip-based 3D printer.The proposed system consists of only a single millimeter-scale photonic chip without any moving parts that emits reconfigurable visible-light holograms up into a simple stationary resin well to enable non-mechanical 3D printing.Furthermore,we experimentally demonstrate a stereolithography-inspired proof-of-concept version of the chip-based 3D printer using a visible-light beam-steering integrated optical phased array and visible-light-curable resin,showing 3D printing using a chip-based system for the first time.This work demonstrates the first steps towards a highlycompact,portable,and low-cost solution for the next generation of 3D printers.展开更多
基金Sponsored by the Scientific Research Project of Zhejiang Provincial Department of Education(Grant No.KYY-ZX-20210329).
文摘To remove handwritten texts from an image of a document taken by smart phone,an intelligent removal method was proposed that combines dewarping and Fully Convolutional Network with Atrous Convolutional and Atrous Spatial Pyramid Pooling(FCN-AC-ASPP).For a picture taken by a smart phone,firstly,the image is transformed into a regular image by the dewarping algorithm.Secondly,the FCN-AC-ASPP is used to classify printed texts and handwritten texts.Lastly,handwritten texts can be removed by a simple algorithm.Experiments show that the classification accuracy of the FCN-AC-ASPP is better than FCN,DeeplabV3+,FCN-AC.For handwritten texts removal effect,the method of combining dewarping and FCN-AC-ASPP is superior to FCN-AC-ASP alone.
文摘Classification of 3D bioprinting As we mentioned in the last editorial,3D printing,also known as additive manufacturing,could be considered as the reverse process of potato cutting,automatically assembling sliced potato,shredded potato,diced potato to integrity[1].Generally speaking,cell-laden 3D bioprinting can be classified into three types:extrusion-based,droplet-based and photocuring-based bioprinting according to different printing principles.Extrusion-based bioprinting squeezes out continuous hydrogel fibers to set up structures;dropletbased bioprinting generates droplets as the basic unit for biofabrication;and photocuring-based bioprinting utilizes the characteristics of light-sensitive materials,to stack 3D models layer-by-layer.Different bioprinting approaches own diverse characteristics facing various scenarios and have specific requirements for bioinks.
文摘Introduction In recent years,three-dimensional printing(3DP),an additive manufacturing process,has gained widespread clinical application,and 3DP has been considered as the third industrial revolution.1 In its early introduction in the 1980s,3DP served as a software-controlled technology that converted computer-aided-design(CAD)data into a physical object via a single process.By depositing multiple two-dimensional cross-sections one above the other,3DP can now be used to build arbitrarily complex geometries and patient-specific constructs using the patient’s imaging data.Till date,computed tomography has been the main imaging data source for 3DP owing to its excellent spatial resolution.Furthermore,current 3D printers have enabled bedside on-demand fabrication of medical products in hospitals.New materials including polymers,ceramics,biomaterials,and metals have been developed for such applications over the last few decades.Medical fields that employ 3DP technologies have also expanded,such as tissue engineering,regenerative medicine,pharmaceutics,and medical models and devices.2 The market for additive manufacturing is expected to surpass$20 billion in the global industry by the end of the 2020.3 Although the use of 3DP technology in interventional medicine is still relatively new,advancements are occurring within this discipline at a rapid rate.Different 3DP technologies,materials,and clinical applications relevant to the interventional field are discussed in this article.
基金financial supports from Agency for Science,Technology,and Research(A*STAR,Singapore)Advanced Manufacturing and Engineering Individual Research Grant(AME IRG)(Project ID:A1883c0013)。
文摘Introduction 3D bioprinting offers a unique biofabrication platform that allows the generation of functional tissue constructs in a spatially/geometrically controlled and automated manner using a 3 D printer and bioink.Bioink serves as the carrier medium that provides the ideal physico-mechanical characteristics for printability,shape fidelity,and support;and a biological microenvironment for the living cells prior to,during.
基金supported by the Research Funding of the Chinese Academy of Sciences (KGZD-EW-T04-4)
文摘It has long been a dream in the electronics industry to be able to write out electronics directly, as simply as printing a picture onto paper with an offi ce printer. The fi rstever prototype of a liquid-metal printer has been invented and demonstrated by our lab, bringing this goal a key step closer. As part of a continuous endeavor, this work is dedicated to significantly extending such technology to the consumer level by making a very practical desktop liquid-metal printer for society in the near future. Through the industrial design and technical optimization of a series of key technical issues such as working reliability, printing resolution, automatic control, human-machine interface design, software, hardware, and integration between software and hardware, a high-quality personal desktop liquid-metal printer that is ready for mass production in industry was fabricated. Its basic features and important technical mechanisms are explained in this paper, along with demonstrations of several possible consumer end-uses for making functional devices such as li ght-emitting diode(LED) displays. This liquid-metal printer is an automatic, easyto-use, and low-cost personal electronics manufacturing tool with many possible applications. This paper discusses important roles that the new machine may play for a group of emerging needs. The prospective future of this cuttingedge technology is outlined, along with a comparative interpretation of several historical printing methods. This desktop liquid-metal printer is expected to become a basic electronics manufacturing tool for a wide variety of emerging practices in the academic realm, in industry, and in education as well as for individual end-users in the near future.
文摘THERE is a 3D printing lab in the First Ward Zone of the Department of Orthopedics at Peking University Third Hospital（PUTH）.Although not big,it’s where Professor Liu Zhongjun,director of the department,spends most of his time,when not dealing with patients and students.
文摘Goller Textilmaschinen GmbH, the leading manufacturer of wet finishing ranges for textile industry and also a Member of the Fong’s Group, presented new technology and equipments to the public at Shanghai
基金the National Science Foundation Faculty Early Career Development(CAREER)Program(Grant No.2239525)Defense Advanced Research Projects Agency(DARPA)VIPER program(Grant No.FA8650-17-1-7713)+2 种基金Robert A.Welch Foundation(Grant No.F-2007)National Science Foundation Graduate Research Fellowship Program(Grant No.1122374)MIT Rolf G.Locher Endowed Fellowship,and MIT Frederick and Barbara Cronin Fellowship.
文摘Imagine if it were possible to create 3D objects in the palm of your hand within seconds using only a single photonic chip.Although 3D printing has revolutionized the way we create in nearly every aspect of modern society,current 3D printers rely on large and complex mechanical systems to enable layer-by-layer addition of material.This limits print speed,resolution,portability,form factor,and material complexity.Although there have been recent efforts in developing novel photocuring-based 3D printers that utilize light to transform matter from liquid resins to solid objects using advanced methods,they remain reliant on bulky and complex mechanical systems.To address these limitations,we combine the fields of silicon photonics and photochemistry to propose the first chip-based 3D printer.The proposed system consists of only a single millimeter-scale photonic chip without any moving parts that emits reconfigurable visible-light holograms up into a simple stationary resin well to enable non-mechanical 3D printing.Furthermore,we experimentally demonstrate a stereolithography-inspired proof-of-concept version of the chip-based 3D printer using a visible-light beam-steering integrated optical phased array and visible-light-curable resin,showing 3D printing using a chip-based system for the first time.This work demonstrates the first steps towards a highlycompact,portable,and low-cost solution for the next generation of 3D printers.
