The feature analysis of fraudulent websites is of great significance to the combat,prevention and control of telecom fraud crimes.Aiming to address the shortcomings of existing analytical approaches,i.e.single dimensi...The feature analysis of fraudulent websites is of great significance to the combat,prevention and control of telecom fraud crimes.Aiming to address the shortcomings of existing analytical approaches,i.e.single dimension and venerability to anti-reconnaissance,this paper adopts the Stacking,the ensemble learning algorithm,combines multiple modalities such as text,image and URL,and proposes a multimodal fraudulent website identification method by ensembling heterogeneous models.Crossvalidation is first used in the training of multiple largely different base classifiers that are strong in learning,such as BERT model,residual neural network(ResNet)and logistic regression model.Classification of the text,image and URL features are then performed respectively.The results of the base classifiers are taken as the input of the meta-classifier,and the output of which is eventually used as the final identification.The study indicates that the fusion method is more effective in identifying fraudulent websites than the single-modal method,and the recall is increased by at least 1%.In addition,the deployment of the algorithm to the real Internet environment shows the improvement of the identification accuracy by at least 1.9%compared with other fusion methods.展开更多
This proposal expresses a standpoint concerning a discussion for the phenomenon of a poor sense of copyright in Chinese youth netizens and the suggestion.The phenomenon of a poor sense of copyright in Chinese youth ne...This proposal expresses a standpoint concerning a discussion for the phenomenon of a poor sense of copyright in Chinese youth netizens and the suggestion.The phenomenon of a poor sense of copyright in Chinese youth netizens has disadvantages.By analyzing it,a clear status of Chinese youth netizens'problems on the poor sense of copyright will be shown.At the same time,when we consider a discussion for the phenomenon of a poor sense of copyright in Chinese youth netizens and the suggestion,we must address several main reasons that contribute to problem.These include cultural tradition restriction,incomprehensive market system,inappropriate price incentive,imperfective legal institutions and indifference education system.It is valuable for the originators feel free to create better works.Meanwhile,those factors are essential for Chinese youth netizens to consider the way to be cultivated the right spending habits.Only by analyzing all these factors together and then using these results to apply to intensity notional cultural competitiveness and form an innovative market.This paper is organized as follows:The first part will outline the poor sense of copyright in Chinese youth netizens'case studies and analyze.The second part is an introduction of the problems of the phenomenon of a poor sense of copyright in Chinese youth netizens.The reasons causing the problems are analyzed in part three.Some proposals to overcome copyright problem will be advocated in last part.This study found that enhancing copyright awareness is a very complex task for Chinese youth netizens.Cultural tradition restriction,incomprehensive market system,inappropriate price incentive,imperfective legal institutions and indifference education system are all factors which bring difficulties to promote copyright awareness in Chinese youth netizens.Combined those factors with four problems of the phenomenon in China,I offer appropriate suggestions to overcome problems and help youth netizens acquire the knowledge of copyright.展开更多
The viscoelastic multi-dimensional earthquake isolation and mitigation device is a new kind of passive control device, which has both earthquake isolation and earthquake mitigation abilities. In order to quantify the ...The viscoelastic multi-dimensional earthquake isolation and mitigation device is a new kind of passive control device, which has both earthquake isolation and earthquake mitigation abilities. In order to quantify the horizontal earthquake isolation and mitigation effect of this device on structures, shaking table tests on structures with and without the devices and the corresponding analysis on earthquake isolation and mitigation properties are carried out. It can be shown from the experimental and analytical results that the device has both earthquake isolation and earthquake mitigation effects on structures in horizontal direction, and its horizontal earthquake mitigation coefficients can be referred to those of the rubber bearing earthquake isolation structure.展开更多
Systems metabolic engineering is a multidisciplinary area that integrates systems biology,synthetic biology and evolutionary engineering.It is an efficient approach for strain improvement and process optimization,and ...Systems metabolic engineering is a multidisciplinary area that integrates systems biology,synthetic biology and evolutionary engineering.It is an efficient approach for strain improvement and process optimization,and has been successfully applied in the microbial production of various chemicals including amino acids.In this review,systems metabolic engineering strategies including pathwayfocused approaches,systems biology-based approaches,evolutionary approaches and their applications in two major amino acid producing microorganisms:Corynebacterium glutamicum and Escherichia coli,are summarized.展开更多
Pure organic room-temperature phosphorescence(RTP)materials have attracted wide attention owing to their excellent luminescent properties and great potential in various applications.In this work,iminostilbene and its ...Pure organic room-temperature phosphorescence(RTP)materials have attracted wide attention owing to their excellent luminescent properties and great potential in various applications.In this work,iminostilbene and its analogues are applied to realize RTP emission by copolymerizing with acrylamide.It can be concluded that the growth of alkane chain in monomers can enhance the lifetime and photoluminescence quantum yield of RTP emission,and polymers with the larger conjugated structure of the monomer show a longer RTP emission wavelength.This work provides a series of new pure organic RTP materials and might provide new thoughts for designing more advanced and superior RTP materials.展开更多
The production of L-tryptophan through che- mical synthesis, direct fermentation, bioconversion and enzymatic conversion has been reported. However, the role of the transport system for the aromatic amino acids in L- ...The production of L-tryptophan through che- mical synthesis, direct fermentation, bioconversion and enzymatic conversion has been reported. However, the role of the transport system for the aromatic amino acids in L- tryptophan producing strains has not been fully explored. In this study, the atop gene of the L-tryptophan producing Escherichia coli TRTH strain was disrupted using Red recombination technology and an atoP mutant E. coli TRTH AaroP was constructed. Fed-batch fermentation of E. coli TRTH △aroP was carried out in 30-L fermentor to investigate the L-tryptophan production. Compared with E. coli TRTH, the atoP mutant was able to maintain a higher growth rate during the exponential phase of the fermentation and the L-tryptophan production increased by 13.3%.展开更多
We used scattering-type scanning near-field optical microscopy(s-SNOM)to investigate the plasmonic properties of edges in well-defined graphene nanostructures,including sharp tapers,nanoribbons and nanogaps,which were...We used scattering-type scanning near-field optical microscopy(s-SNOM)to investigate the plasmonic properties of edges in well-defined graphene nanostructures,including sharp tapers,nanoribbons and nanogaps,which were all fabricated via the growth-etching chemical vapor deposition(GECVD)method.The obtained near-field images revealed the localized plasmon modes along the graphene nanoribbon;these modes strongly depended on the size of the graphene pattern,the angle of the tapered graphene and the infrared excitation wavelength.These interesting plasmon modes were verified by numerical simulations and explained by the reflection,and interference of electromagnetic waves at the graphene–SiO_(2) edge.The constructive interference at the graphene nanogap caused by charge accumulation was demonstrated for the first time.Using the infrared nanoimaging technique,greater plasmon broadening was observed in the zigzag edge than in the armchair edge.Our study suggests that graphene edges should be separated by an effective working distance to avoid the overlapping of localized plasmon modes,which is very important for the design of graphene-based plasmonic circuits and devices.展开更多
With the rapid development of artificial intelligence(AI),the application of this technology in the medical field is becoming increasingly extensive,along with a gradual increase in the amount of intelligent equipment...With the rapid development of artificial intelligence(AI),the application of this technology in the medical field is becoming increasingly extensive,along with a gradual increase in the amount of intelligent equipment in hospitals.Service robots can save human resources and replace nursing staff to achieve some work.In view of the phenomenon of mobile service robots'grabbing and distribution of patients'drugs in hospitals,a real‐time object detection and positioning system based on image and text information is proposed,which realizes the precise positioning and tracking of the grabbing objects and completes the grasping of a specific object(medicine bottle).The lightweight object detection model NanoDet is used to learn the features of the grasping objects and the object category,and bounding boxes are regressed.Then,the images in the bounding boxes are enhanced to overcome unfavourable factors,such as a small object region.The text detection and recognition model PP‐OCR is used to detect and recognise the enhanced images and extract the text information.The object information provided by the two models is fused,and the text recognition result is matched with the object detection box to achieve the precise posi-tioning of the grasping object.The kernel correlation filter(KCF)tracking algorithm is introduced to achieve real‐time tracking of specific objects to precisely control the robot's grasping.Both deep learning models adopt lightweight networks to facilitate direct deployment.The experiments show that the proposed robot grasping detection system has high reliability,accuracy and real‐time performance.展开更多
基金supported by Zhejiang Provincial Natural Science Foundation of China(Grant No.LGF20G030001)Ministry of Public Security Science and Technology Plan Project(2022LL16)Key scientific research projects of agricultural and social development in Hangzhou in 2020(202004A06).
文摘The feature analysis of fraudulent websites is of great significance to the combat,prevention and control of telecom fraud crimes.Aiming to address the shortcomings of existing analytical approaches,i.e.single dimension and venerability to anti-reconnaissance,this paper adopts the Stacking,the ensemble learning algorithm,combines multiple modalities such as text,image and URL,and proposes a multimodal fraudulent website identification method by ensembling heterogeneous models.Crossvalidation is first used in the training of multiple largely different base classifiers that are strong in learning,such as BERT model,residual neural network(ResNet)and logistic regression model.Classification of the text,image and URL features are then performed respectively.The results of the base classifiers are taken as the input of the meta-classifier,and the output of which is eventually used as the final identification.The study indicates that the fusion method is more effective in identifying fraudulent websites than the single-modal method,and the recall is increased by at least 1%.In addition,the deployment of the algorithm to the real Internet environment shows the improvement of the identification accuracy by at least 1.9%compared with other fusion methods.
文摘This proposal expresses a standpoint concerning a discussion for the phenomenon of a poor sense of copyright in Chinese youth netizens and the suggestion.The phenomenon of a poor sense of copyright in Chinese youth netizens has disadvantages.By analyzing it,a clear status of Chinese youth netizens'problems on the poor sense of copyright will be shown.At the same time,when we consider a discussion for the phenomenon of a poor sense of copyright in Chinese youth netizens and the suggestion,we must address several main reasons that contribute to problem.These include cultural tradition restriction,incomprehensive market system,inappropriate price incentive,imperfective legal institutions and indifference education system.It is valuable for the originators feel free to create better works.Meanwhile,those factors are essential for Chinese youth netizens to consider the way to be cultivated the right spending habits.Only by analyzing all these factors together and then using these results to apply to intensity notional cultural competitiveness and form an innovative market.This paper is organized as follows:The first part will outline the poor sense of copyright in Chinese youth netizens'case studies and analyze.The second part is an introduction of the problems of the phenomenon of a poor sense of copyright in Chinese youth netizens.The reasons causing the problems are analyzed in part three.Some proposals to overcome copyright problem will be advocated in last part.This study found that enhancing copyright awareness is a very complex task for Chinese youth netizens.Cultural tradition restriction,incomprehensive market system,inappropriate price incentive,imperfective legal institutions and indifference education system are all factors which bring difficulties to promote copyright awareness in Chinese youth netizens.Combined those factors with four problems of the phenomenon in China,I offer appropriate suggestions to overcome problems and help youth netizens acquire the knowledge of copyright.
基金Supported by the National Natural Science Foundation of China(Grant No.50508010)the Jiangsu Province Natural Science Foundation(Grant No.BK2008282)the Program for New Century Excellent Talents of the Ministry of Education in China,the Program for Jiangsu Province333Talents and the Project-sponsored by SRF for ROCS,SEM
文摘The viscoelastic multi-dimensional earthquake isolation and mitigation device is a new kind of passive control device, which has both earthquake isolation and earthquake mitigation abilities. In order to quantify the horizontal earthquake isolation and mitigation effect of this device on structures, shaking table tests on structures with and without the devices and the corresponding analysis on earthquake isolation and mitigation properties are carried out. It can be shown from the experimental and analytical results that the device has both earthquake isolation and earthquake mitigation effects on structures in horizontal direction, and its horizontal earthquake mitigation coefficients can be referred to those of the rubber bearing earthquake isolation structure.
基金This research was supported by National High Technology Research and Development Program of China(2015AA021003)National Natural Science Foundation of China(31470211)+1 种基金Natural Science Foundation of Tianjin(17JCQNJC09500)Foundation(No.2016IM104)of Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education and Tianjin Key Lab of Industrial Microbiology(Tianjin Universityof Science&Technology).
文摘Systems metabolic engineering is a multidisciplinary area that integrates systems biology,synthetic biology and evolutionary engineering.It is an efficient approach for strain improvement and process optimization,and has been successfully applied in the microbial production of various chemicals including amino acids.In this review,systems metabolic engineering strategies including pathwayfocused approaches,systems biology-based approaches,evolutionary approaches and their applications in two major amino acid producing microorganisms:Corynebacterium glutamicum and Escherichia coli,are summarized.
基金the financial support from the National Natural Science Foundation of China (Nos. 21788102, 22125803, 22020102006 and 21871083)Program of Shanghai Academic/Technology Research Leader (No. 20XD1421300)+2 种基金‘Shu Guang’ Project supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation (No. 19SG26)the Innovation Program of Shanghai Municipal Education Commission (No. 2017–01–07–00–02-E00010)the Fundamental Research Funds for the Central Universities.
文摘Pure organic room-temperature phosphorescence(RTP)materials have attracted wide attention owing to their excellent luminescent properties and great potential in various applications.In this work,iminostilbene and its analogues are applied to realize RTP emission by copolymerizing with acrylamide.It can be concluded that the growth of alkane chain in monomers can enhance the lifetime and photoluminescence quantum yield of RTP emission,and polymers with the larger conjugated structure of the monomer show a longer RTP emission wavelength.This work provides a series of new pure organic RTP materials and might provide new thoughts for designing more advanced and superior RTP materials.
文摘The production of L-tryptophan through che- mical synthesis, direct fermentation, bioconversion and enzymatic conversion has been reported. However, the role of the transport system for the aromatic amino acids in L- tryptophan producing strains has not been fully explored. In this study, the atop gene of the L-tryptophan producing Escherichia coli TRTH strain was disrupted using Red recombination technology and an atoP mutant E. coli TRTH AaroP was constructed. Fed-batch fermentation of E. coli TRTH △aroP was carried out in 30-L fermentor to investigate the L-tryptophan production. Compared with E. coli TRTH, the atoP mutant was able to maintain a higher growth rate during the exponential phase of the fermentation and the L-tryptophan production increased by 13.3%.
基金support from the National Key Research&Development Program(2015CB932700 and 2016YFA0201902)the National Natural Science Foundation of China(grant No.51290273,91433107,51325205 and 51521091)+6 种基金the Doctoral Fund of the Ministry of Education of China(grant No.20123201120026)ARC(DP140101501 and FT150100450)the Collaborative Innovation Center of Suzhou Nano Science&Technologythe Priority Academic Program Development of Jiangsu Higher Education InstitutionsA*STAR Pharos Programme(grant No.1527000014,with Project No.R-263-000-B91-305)Competitive Research Program(CRP Award No.NRF-CRP15-2015-03)the National Research Foundation,Prime Minister’s Office,Singapore。
文摘We used scattering-type scanning near-field optical microscopy(s-SNOM)to investigate the plasmonic properties of edges in well-defined graphene nanostructures,including sharp tapers,nanoribbons and nanogaps,which were all fabricated via the growth-etching chemical vapor deposition(GECVD)method.The obtained near-field images revealed the localized plasmon modes along the graphene nanoribbon;these modes strongly depended on the size of the graphene pattern,the angle of the tapered graphene and the infrared excitation wavelength.These interesting plasmon modes were verified by numerical simulations and explained by the reflection,and interference of electromagnetic waves at the graphene–SiO_(2) edge.The constructive interference at the graphene nanogap caused by charge accumulation was demonstrated for the first time.Using the infrared nanoimaging technique,greater plasmon broadening was observed in the zigzag edge than in the armchair edge.Our study suggests that graphene edges should be separated by an effective working distance to avoid the overlapping of localized plasmon modes,which is very important for the design of graphene-based plasmonic circuits and devices.
基金National Natural Science Foundation of China under Grants,Grant/Award Number:61973184Young Scholars Program of Shandong University,Weihai,Grant/Award Number:20820211010+1 种基金National Key Research and Development Plan of China under Grant,Grant/Award Number:2020AAA0108903Natural Science Foundation of Shandong Province,Grant/Award Numbers:ZR2020MD041,ZR2020MF077。
文摘With the rapid development of artificial intelligence(AI),the application of this technology in the medical field is becoming increasingly extensive,along with a gradual increase in the amount of intelligent equipment in hospitals.Service robots can save human resources and replace nursing staff to achieve some work.In view of the phenomenon of mobile service robots'grabbing and distribution of patients'drugs in hospitals,a real‐time object detection and positioning system based on image and text information is proposed,which realizes the precise positioning and tracking of the grabbing objects and completes the grasping of a specific object(medicine bottle).The lightweight object detection model NanoDet is used to learn the features of the grasping objects and the object category,and bounding boxes are regressed.Then,the images in the bounding boxes are enhanced to overcome unfavourable factors,such as a small object region.The text detection and recognition model PP‐OCR is used to detect and recognise the enhanced images and extract the text information.The object information provided by the two models is fused,and the text recognition result is matched with the object detection box to achieve the precise posi-tioning of the grasping object.The kernel correlation filter(KCF)tracking algorithm is introduced to achieve real‐time tracking of specific objects to precisely control the robot's grasping.Both deep learning models adopt lightweight networks to facilitate direct deployment.The experiments show that the proposed robot grasping detection system has high reliability,accuracy and real‐time performance.
