In order to improve the efficiency of cloud-based web services,an improved plant growth simulation algorithm scheduling model.This model first used mathematical methods to describe the relationships between cloud-base...In order to improve the efficiency of cloud-based web services,an improved plant growth simulation algorithm scheduling model.This model first used mathematical methods to describe the relationships between cloud-based web services and the constraints of system resources.Then,a light-induced plant growth simulation algorithm was established.The performance of the algorithm was compared through several plant types,and the best plant model was selected as the setting for the system.Experimental results show that when the number of test cloud-based web services reaches 2048,the model being 2.14 times faster than PSO,2.8 times faster than the ant colony algorithm,2.9 times faster than the bee colony algorithm,and a remarkable 8.38 times faster than the genetic algorithm.展开更多
The integration of 5G technology with cloud-based control systems in industrial robots holds significant promise for the future of industrial automation.With its ultra-low latency,high data transfer speeds,and massive...The integration of 5G technology with cloud-based control systems in industrial robots holds significant promise for the future of industrial automation.With its ultra-low latency,high data transfer speeds,and massive connectivity,5G is poised to revolutionize real-time communication and coordination in manufacturing environments.This paper explores the prospects and challenges of applying 5G technology in industrial robots,focusing on cloud-based control systems that enable scalable,flexible,and efficient operations.Key advantages of 5G,including improved communication speed,enhanced real-time control,scalability,and predictive maintenance capabilities,are discussed.However,the transition to 5G also presents challenges,such as network reliability,security concerns,integration with legacy systems,and high implementation costs.The paper also examines case studies in the automotive,electronics,and aerospace industries,providing real-world examples of 5G adoption in industrial automation.The conclusion highlights key insights and outlines potential research directions for overcoming existing barriers and fully realizing the potential of 5G technology in industrial robot control.展开更多
This study first analyzes four distinct forms of Fujian folk dance,highlighting the notable differences in their cultural characteristics and dance qualities.It then categorizes these dance forms to align with textboo...This study first analyzes four distinct forms of Fujian folk dance,highlighting the notable differences in their cultural characteristics and dance qualities.It then categorizes these dance forms to align with textbook construction,discussing in depth the principles guiding the development of textbooks that correspond to these classifications.展开更多
BACKGROUND Laparoscopic distal pancreatectomy(LDP)has emerged as the preferred approach for both benign and malignant lesions located in the pancreatic body and tail.Nevertheless,a notable deficiency persists in the a...BACKGROUND Laparoscopic distal pancreatectomy(LDP)has emerged as the preferred approach for both benign and malignant lesions located in the pancreatic body and tail.Nevertheless,a notable deficiency persists in the absence of a standardized,procedure-specific metric for evaluating and comparing surgical quality.A composite measure termed“textbook outcome(TO)”,which encompasses key short-term endpoints,has been validated in laparoscopic pancreatoduodenectomy but has not yet been established in dedicated LDP cohorts.The definition and prediction of TO in this context could aid in facilitating cross-institutional benchmarking and fostering advancements in quality improvement.AIM To establish procedure-specific criteria for TO and identify independent predictors of TO failure in patients undergoing LDP.METHODS Consecutive patients who underwent LDP at a single high-volume pancreatic center between January 2015 and August 2022 were retrospectively analyzed.TO was defined as the absence of clinically relevant postoperative pancreatic fistula(grade B/C),post-pancreatectomy hemorrhage(grade B/C),severe complications(Clavien-Dindo≥III),readmission within 30 days,and in-hospital or 30-day mortality.Multivariable logistic regression was employed to identify independent predictors of TO failure,and a nomogram was constructed and internally validated.RESULTS Among 405 eligible patients,286(70.6%)attained TO.Multivariable analysis revealed that female sex[odds ratio(OR)=0.62,95%confidence interval(CI):0.39-0.99]conferred a protective effect,while preoperative endoscopic ultrasound-guided fine-needle aspiration(OR=2.66,95%CI:1.05-6.73),pancreatic portal hypertension(OR=2.81,95%CI:1.06-7.45),and cystic-solid(OR=2.51,95%CI:1.34-4.69)or solid lesions(OR=1.91,95%CI:1.06-3.44)were independently associated with TO failure(all P<0.05).The derived nomogram exhibited modest discrimination and calibration when assessed in both the training and validation datasets.CONCLUSION The proposed LDP-specific definition of TO is feasible and discriminative,and the developed nomogram provides an objective tool for individualized risk assessment.展开更多
This paper presents four teaching techniques of activating the textbook for intensive reading which include:injecting contemporary elements into the text,relating the text to students' life,questioning about the t...This paper presents four teaching techniques of activating the textbook for intensive reading which include:injecting contemporary elements into the text,relating the text to students' life,questioning about the text challengingly and ingeniously,and spicing up the text.展开更多
The appraisal of textbooks not only before selection, but also after they have been used, is a valuable exercise for any teacher. It provides a greater perception of the book's strengths and weaknesses, which enab...The appraisal of textbooks not only before selection, but also after they have been used, is a valuable exercise for any teacher. It provides a greater perception of the book's strengths and weaknesses, which enables the teacher to focus on the weak points and adapt or supplement them accordingly. The paper will provide a detailed evaluation of an EFL textbook focusing on cultural assumptions considering the cultural content and methodology with reference to a specific teaching context by discussing the various aspects of culture reflected in the various components as well as the type of methodology and syllabus design the book follows. Finally, implication and adaptation of this textbook will be argued.展开更多
Textbooks, as one of the important elements for the teaching effects and students' training aim and quality are the main carri-er and means for the realization of teaching objectives. The paper analyzes the proble...Textbooks, as one of the important elements for the teaching effects and students' training aim and quality are the main carri-er and means for the realization of teaching objectives. The paper analyzes the problems of currently-used textbooks at the followingthree aspects, textbook users, compiling styles and contents, based on 31 popular English writing textbooks used at Polytechnics as re-search subjects. Aiming to improve textbook quality and English teaching reform at Polytechnics, the paper also puts forward the ideasof compiling English writing textbooks on the basis of Feuerstein's theory.展开更多
The concept of sharing of personal health data over cloud storage in a healthcare-cyber physical system has become popular in recent times as it improves access quality.The privacy of health data can only be preserved...The concept of sharing of personal health data over cloud storage in a healthcare-cyber physical system has become popular in recent times as it improves access quality.The privacy of health data can only be preserved by keeping it in an encrypted form,but it affects usability and flexibility in terms of effective search.Attribute-based searchable encryption(ABSE)has proven its worth by providing fine-grained searching capabilities in the shared cloud storage.However,it is not practical to apply this scheme to the devices with limited resources and storage capacity because a typical ABSE involves serious computations.In a healthcare cloud-based cyber-physical system(CCPS),the data is often collected by resource-constraint devices;therefore,here also,we cannot directly apply ABSE schemes.In the proposed work,the inherent computational cost of the ABSE scheme is managed by executing the computationally intensive tasks of a typical ABSE scheme on the blockchain network.Thus,it makes the proposed scheme suitable for online storage and retrieval of personal health data in a typical CCPS.With the assistance of blockchain technology,the proposed scheme offers two main benefits.First,it is free from a trusted authority,which makes it genuinely decentralized and free from a single point of failure.Second,it is computationally efficient because the computational load is now distributed among the consensus nodes in the blockchain network.Specifically,the task of initializing the system,which is considered the most computationally intensive,and the task of partial search token generation,which is considered as the most frequent operation,is now the responsibility of the consensus nodes.This eliminates the need of the trusted authority and reduces the burden of data users,respectively.Further,in comparison to existing decentralized fine-grained searchable encryption schemes,the proposed scheme has achieved a significant reduction in storage and computational cost for the secret key associated with users.It has been verified both theoretically and practically in the performance analysis section.展开更多
This paper presents a cloud-based data-driven design optimization system,named DADOS,to help engineers and researchers improve a design or product easily and efficiently.DADOS has nearly 30 key algorithms,including th...This paper presents a cloud-based data-driven design optimization system,named DADOS,to help engineers and researchers improve a design or product easily and efficiently.DADOS has nearly 30 key algorithms,including the design of experiments,surrogate models,model validation and selection,prediction,optimization,and sensitivity analysis.Moreover,it also includes an exclusive ensemble surrogate modeling technique,the extended hybrid adaptive function,which can make use of the advantages of each surrogate and eliminate the effort of selecting the appropriate individual surrogate.To improve ease of use,DADOS provides a user-friendly graphical user interface and employed flow-based programming so that users can conduct design optimization just by dragging,dropping,and connecting algorithm blocks into a workflow instead of writing massive code.In addition,DADOS allows users to visualize the results to gain more insights into the design problems,allows multi-person collaborating on a project at the same time,and supports multi-disciplinary optimization.This paper also details the architecture and the user interface of DADOS.Two examples were employed to demonstrate how to use DADOS to conduct data-driven design optimization.Since DADOS is a cloud-based system,anyone can access DADOS at www.dados.com.cn using their web browser without the need for installation or powerful hardware.展开更多
With the rapid development of computer technology, cloud-based services have become a hot topic. They not only provide users with convenience, but also bring many security issues, such as data sharing and privacy issu...With the rapid development of computer technology, cloud-based services have become a hot topic. They not only provide users with convenience, but also bring many security issues, such as data sharing and privacy issue. In this paper, we present an access control system with privilege separation based on privacy protection(PS-ACS). In the PS-ACS scheme, we divide users into private domain(PRD) and public domain(PUD) logically. In PRD, to achieve read access permission and write access permission, we adopt the Key-Aggregate Encryption(KAE) and the Improved Attribute-based Signature(IABS) respectively. In PUD, we construct a new multi-authority ciphertext policy attribute-based encryption(CP-ABE) scheme with efficient decryption to avoid the issues of single point of failure and complicated key distribution, and design an efficient attribute revocation method for it. The analysis and simulation result show that our scheme is feasible and superior to protect users' privacy in cloud-based services.展开更多
Cloud-based satellite and terrestrial spectrum shared networks(CB-STSSN)combines the triple advantages of efficient and flexible net-work management of heterogeneous cloud access(H-CRAN),vast coverage of satellite net...Cloud-based satellite and terrestrial spectrum shared networks(CB-STSSN)combines the triple advantages of efficient and flexible net-work management of heterogeneous cloud access(H-CRAN),vast coverage of satellite networks,and good communication quality of terrestrial networks.Thanks to the complementary coverage characteristics,any-time and anywhere high-speed communications can be achieved to meet the various needs of users.The scarcity of spectrum resources is a common prob-lem in both satellite and terrestrial networks.In or-der to improve resource utilization,the spectrum is shared not only within each component but also be-tween satellite beams and terrestrial cells,which intro-duces inter-component interferences.To this end,this paper first proposes an analytical framework which considers the inter-component interferences induced by spectrum sharing(SS).An intelligent SS scheme based on radio map(RM)consisting of LSTM-based beam prediction(BP),transfer learning-based spec-trum prediction(SP)and joint non-preemptive prior-ity and preemptive priority(J-NPAP)-based propor-tional fair spectrum allocation is than proposed.The simulation result shows that the spectrum utilization rate of CB-STSSN is improved and user blocking rate and waiting probability are decreased by the proposed scheme.展开更多
An e-tag used on the freeway is a kind of passive sensors composed of sensors and radio- frequency identification （RFID） tags. The principle of the electronic toll collection system is that the sensor emits radio wa...An e-tag used on the freeway is a kind of passive sensors composed of sensors and radio- frequency identification （RFID） tags. The principle of the electronic toll collection system is that the sensor emits radio waves touching the e-tag within a certain range, the e-tag will respond to the radio waves by induction, and the sensor will read and write information of the vehicles. Although the RFID technology is popularly used in campus management systems, there is no e-tag technology application used in a campus parking system. In this paper, we use the e-tag technology on a campus parking management system based on the cloud-based construction. By this, it helps to achieve automated and standardized management of the campus parking system, enhance management efficiency, reduce the residence time of the vehicles at the entrances and exits, and improve the efficiency of vehicles parked at the same time.展开更多
With the rapid development of modern technology,textbooks have been undergoing great changes from the traditionallypaper-based form to the multimodal form.Multimodality has become a major feature of textbook discourse...With the rapid development of modern technology,textbooks have been undergoing great changes from the traditionallypaper-based form to the multimodal form.Multimodality has become a major feature of textbook discourse.Multimodal discourseanalysis is a new approach to discourse analysis based on the semiotic theory of systemic functional linguistics.This paper providesa detailed review of multimodal discourse analysis(hereafter MDA) in modern linguistics and some previous researches on textbookdiscourse.Then it further outlines what have already been done on textbook discourse from the perspective of MDA.展开更多
In recent years,with the rapid advancement of digital technologies,digitization in vocational education has become a major trend.Among these advancements,digital textbooks have emerged at the forefront of digitization...In recent years,with the rapid advancement of digital technologies,digitization in vocational education has become a major trend.Among these advancements,digital textbooks have emerged at the forefront of digitization,significantly impacting both their form and content.This article aims to analyze the existing issues in the use of digital textbooks in vocational education and emphasize the importance of recognizing the vital role of teachers in the wave of digital textbook innovation.It is crucial to clarify the role and positioning of teachers to avoid inadvertently diminishing their classroom significance while prioritizing technological innovations.Teachers should fully leverage the role of digital textbooks as tools for organizing classroom activities and recognize the core and essence of classroom teaching as digital technologies enter the scope of vocational education.By doing so,teachers can contribute to the high-quality development of modern vocational education.展开更多
Mixed redundancy strategies are generally used in cloud-based systems,with different node switch mechanisms from traditional fault-tolerant strategies.Existing studies often concentrate on optimizing a single strategy...Mixed redundancy strategies are generally used in cloud-based systems,with different node switch mechanisms from traditional fault-tolerant strategies.Existing studies often concentrate on optimizing a single strategy in cloud computing environment and ignore the impact of mixed redundancy strategies.Therefore,a model is proposed to evaluate and optimize the reliability and performance of cloud-based degraded systems subject to a mixed active and cold standby redundancy strategy.In this strategy,node switching is triggered by a continual monitoring and detection mechanism when active nodes fail.To evaluate the transient availability and the expected job completion rate of systems with such kind of strategy,a continuous-time Markov chain model is built on the state transition process and a numerical method is used to solve the model.To choose the optimal redundancy for the mixed strategy under system constraints,a greedy search algorithm is proposed after sensitivity analysis.Illustrative examples were presented to explain the process of calculating the transient probability of each system state and in turn,the availability and performance of the whole system.It was shown that the near-optimal redundancy solution could be obtained using the optimizationmethod.The comparison with optimization of the traditional mixed redundancy strategy proved that the system behavior was different using different kinds of mixed strategies and less redundancy was assigned for the new type of mixed strategy under the same system constraint.展开更多
This essay attempts to aim English teachers to evaluate and adapt the current English textbooks. According to different levels and majors of the students,English teachers can enhance the teaching materials and their t...This essay attempts to aim English teachers to evaluate and adapt the current English textbooks. According to different levels and majors of the students,English teachers can enhance the teaching materials and their teaching skills. This paper would provide several useful techniques for teachers to make evaluations and adaptations of using teaching materials.展开更多
Readability is a fundamental problem in textbooks assessment.For low resources languages(LRL),however,little investigation has been done on the readability of textbook.In this paper,we proposed a readability assessmen...Readability is a fundamental problem in textbooks assessment.For low resources languages(LRL),however,little investigation has been done on the readability of textbook.In this paper,we proposed a readability assessment method for Tibetan textbook(a low resource language).We extract features based on the information that are gotten by Tibetan segmentation and named entity recognition.Then,we calculate the correlation of different features using Pearson Correlation Coefficient and select some feature sets to design the readability formula.Fit detection,F test and T test are applied on these selected features to generate a new readability assessment formula.Experiment shows that this new formula is capable of assessing the readability of Tibetan textbooks.展开更多
The paper investigates Saudi English textbooks in order to trace the ways in which culture was dealt with in the English curriculum in the last 33 years. To this end, the three textbooks which were published one after...The paper investigates Saudi English textbooks in order to trace the ways in which culture was dealt with in the English curriculum in the last 33 years. To this end, the three textbooks which were published one after another for the third-grade secondary school students in the last three decades were analyzed. The paper finds that in the first book published in 1982, the writer introduced only those cultural elements from outside Saudi Arabia, which could be subordinated to the self-enclosed cohesive Saudi national culture that rested and was shaped on and around the faith of Islam. The same cultural pattern is maintained in the second book published in 1998, but in the third book published in 2013, a huge number of western and multicultural elements were accommodated without any attempt to assimilate them to Saudi national culture. The paper concludes that in these textbooks, culture was taken either as Parsons＇s ＂system＂--pattern-maintaining national culture-or as Rothkopf＇s and Friedman＇s ＂pattern-breaking＂ western culture, but it was seldom treated as Bauman＇s ＂matrix＂.展开更多
Vocabulary acquisition is a foundation of second language acquisition.How to memorize vocabulary effectively is a troubling issue both for learners and teachers.The experiments show that the more closely connected bet...Vocabulary acquisition is a foundation of second language acquisition.How to memorize vocabulary effectively is a troubling issue both for learners and teachers.The experiments show that the more closely connected between pair words,the higher rate of recurrence with correctness.Focusing on the connection of morphemes in Chinese vocabulary teaching can accelerate students'memories of new words.The author believes morpheme teaching is also evidently effective for those Chinese learners using Chinese characters in Japan.However,after examining the order of words with same morphemes in 14 elementary Chinese textbooks,the authors found that current textbooks have not provided a list of words with same morpheme thus imposing learners'memory burden due to learning repetitive words.Meanwhile,this paper proposes"radial networks"among morphemes with same words,also promotes the expansion of vocabulary by morpheme association.展开更多
We intend to establish how species diversity is dealt with, within the study of the ecosystem, in books for the 4th year of Compulsory Secondary Education, ESO （15-16 year-old students）. The analysis was carried out...We intend to establish how species diversity is dealt with, within the study of the ecosystem, in books for the 4th year of Compulsory Secondary Education, ESO （15-16 year-old students）. The analysis was carried out using a key issues dossier based on school science, which not only provides a description of reality, but also introduces a theoretical explanatory framework. Regarding species diversity, we focused on the descriptive approach, considering the link between diversity and trophic relationships, ecological succession and ecosystem stability through change, consequences for biodiversity of human activities and mechanisms to face such consequences; and on the explanatory perspective, which provides an interpretative answer for all the aspects previously mentioned. The findings drawn from textbooks show that biodiversity is linked both to the study of the ecosystem and to the impact of human societies on its maintenance. However, such study is particularly focused on the descriptive, rather than on the explanatory level. So, teachers should improve the study of biodiversity foresting a balance between descriptive and explanatory level.展开更多
基金Shanxi Province Higher Education Science and Technology Innovation Fund Project(2022-676)Shanxi Soft Science Program Research Fund Project(2016041008-6)。
文摘In order to improve the efficiency of cloud-based web services,an improved plant growth simulation algorithm scheduling model.This model first used mathematical methods to describe the relationships between cloud-based web services and the constraints of system resources.Then,a light-induced plant growth simulation algorithm was established.The performance of the algorithm was compared through several plant types,and the best plant model was selected as the setting for the system.Experimental results show that when the number of test cloud-based web services reaches 2048,the model being 2.14 times faster than PSO,2.8 times faster than the ant colony algorithm,2.9 times faster than the bee colony algorithm,and a remarkable 8.38 times faster than the genetic algorithm.
文摘The integration of 5G technology with cloud-based control systems in industrial robots holds significant promise for the future of industrial automation.With its ultra-low latency,high data transfer speeds,and massive connectivity,5G is poised to revolutionize real-time communication and coordination in manufacturing environments.This paper explores the prospects and challenges of applying 5G technology in industrial robots,focusing on cloud-based control systems that enable scalable,flexible,and efficient operations.Key advantages of 5G,including improved communication speed,enhanced real-time control,scalability,and predictive maintenance capabilities,are discussed.However,the transition to 5G also presents challenges,such as network reliability,security concerns,integration with legacy systems,and high implementation costs.The paper also examines case studies in the automotive,electronics,and aerospace industries,providing real-world examples of 5G adoption in industrial automation.The conclusion highlights key insights and outlines potential research directions for overcoming existing barriers and fully realizing the potential of 5G technology in industrial robot control.
文摘This study first analyzes four distinct forms of Fujian folk dance,highlighting the notable differences in their cultural characteristics and dance qualities.It then categorizes these dance forms to align with textbook construction,discussing in depth the principles guiding the development of textbooks that correspond to these classifications.
文摘BACKGROUND Laparoscopic distal pancreatectomy(LDP)has emerged as the preferred approach for both benign and malignant lesions located in the pancreatic body and tail.Nevertheless,a notable deficiency persists in the absence of a standardized,procedure-specific metric for evaluating and comparing surgical quality.A composite measure termed“textbook outcome(TO)”,which encompasses key short-term endpoints,has been validated in laparoscopic pancreatoduodenectomy but has not yet been established in dedicated LDP cohorts.The definition and prediction of TO in this context could aid in facilitating cross-institutional benchmarking and fostering advancements in quality improvement.AIM To establish procedure-specific criteria for TO and identify independent predictors of TO failure in patients undergoing LDP.METHODS Consecutive patients who underwent LDP at a single high-volume pancreatic center between January 2015 and August 2022 were retrospectively analyzed.TO was defined as the absence of clinically relevant postoperative pancreatic fistula(grade B/C),post-pancreatectomy hemorrhage(grade B/C),severe complications(Clavien-Dindo≥III),readmission within 30 days,and in-hospital or 30-day mortality.Multivariable logistic regression was employed to identify independent predictors of TO failure,and a nomogram was constructed and internally validated.RESULTS Among 405 eligible patients,286(70.6%)attained TO.Multivariable analysis revealed that female sex[odds ratio(OR)=0.62,95%confidence interval(CI):0.39-0.99]conferred a protective effect,while preoperative endoscopic ultrasound-guided fine-needle aspiration(OR=2.66,95%CI:1.05-6.73),pancreatic portal hypertension(OR=2.81,95%CI:1.06-7.45),and cystic-solid(OR=2.51,95%CI:1.34-4.69)or solid lesions(OR=1.91,95%CI:1.06-3.44)were independently associated with TO failure(all P<0.05).The derived nomogram exhibited modest discrimination and calibration when assessed in both the training and validation datasets.CONCLUSION The proposed LDP-specific definition of TO is feasible and discriminative,and the developed nomogram provides an objective tool for individualized risk assessment.
文摘This paper presents four teaching techniques of activating the textbook for intensive reading which include:injecting contemporary elements into the text,relating the text to students' life,questioning about the text challengingly and ingeniously,and spicing up the text.
文摘The appraisal of textbooks not only before selection, but also after they have been used, is a valuable exercise for any teacher. It provides a greater perception of the book's strengths and weaknesses, which enables the teacher to focus on the weak points and adapt or supplement them accordingly. The paper will provide a detailed evaluation of an EFL textbook focusing on cultural assumptions considering the cultural content and methodology with reference to a specific teaching context by discussing the various aspects of culture reflected in the various components as well as the type of methodology and syllabus design the book follows. Finally, implication and adaptation of this textbook will be argued.
文摘Textbooks, as one of the important elements for the teaching effects and students' training aim and quality are the main carri-er and means for the realization of teaching objectives. The paper analyzes the problems of currently-used textbooks at the followingthree aspects, textbook users, compiling styles and contents, based on 31 popular English writing textbooks used at Polytechnics as re-search subjects. Aiming to improve textbook quality and English teaching reform at Polytechnics, the paper also puts forward the ideasof compiling English writing textbooks on the basis of Feuerstein's theory.
文摘The concept of sharing of personal health data over cloud storage in a healthcare-cyber physical system has become popular in recent times as it improves access quality.The privacy of health data can only be preserved by keeping it in an encrypted form,but it affects usability and flexibility in terms of effective search.Attribute-based searchable encryption(ABSE)has proven its worth by providing fine-grained searching capabilities in the shared cloud storage.However,it is not practical to apply this scheme to the devices with limited resources and storage capacity because a typical ABSE involves serious computations.In a healthcare cloud-based cyber-physical system(CCPS),the data is often collected by resource-constraint devices;therefore,here also,we cannot directly apply ABSE schemes.In the proposed work,the inherent computational cost of the ABSE scheme is managed by executing the computationally intensive tasks of a typical ABSE scheme on the blockchain network.Thus,it makes the proposed scheme suitable for online storage and retrieval of personal health data in a typical CCPS.With the assistance of blockchain technology,the proposed scheme offers two main benefits.First,it is free from a trusted authority,which makes it genuinely decentralized and free from a single point of failure.Second,it is computationally efficient because the computational load is now distributed among the consensus nodes in the blockchain network.Specifically,the task of initializing the system,which is considered the most computationally intensive,and the task of partial search token generation,which is considered as the most frequent operation,is now the responsibility of the consensus nodes.This eliminates the need of the trusted authority and reduces the burden of data users,respectively.Further,in comparison to existing decentralized fine-grained searchable encryption schemes,the proposed scheme has achieved a significant reduction in storage and computational cost for the secret key associated with users.It has been verified both theoretically and practically in the performance analysis section.
基金Supported by National Key Research and Development Program of China (Grant No.2018YFB1700704)National Natural Science Foundation of China (Grant No.52075068)。
文摘This paper presents a cloud-based data-driven design optimization system,named DADOS,to help engineers and researchers improve a design or product easily and efficiently.DADOS has nearly 30 key algorithms,including the design of experiments,surrogate models,model validation and selection,prediction,optimization,and sensitivity analysis.Moreover,it also includes an exclusive ensemble surrogate modeling technique,the extended hybrid adaptive function,which can make use of the advantages of each surrogate and eliminate the effort of selecting the appropriate individual surrogate.To improve ease of use,DADOS provides a user-friendly graphical user interface and employed flow-based programming so that users can conduct design optimization just by dragging,dropping,and connecting algorithm blocks into a workflow instead of writing massive code.In addition,DADOS allows users to visualize the results to gain more insights into the design problems,allows multi-person collaborating on a project at the same time,and supports multi-disciplinary optimization.This paper also details the architecture and the user interface of DADOS.Two examples were employed to demonstrate how to use DADOS to conduct data-driven design optimization.Since DADOS is a cloud-based system,anyone can access DADOS at www.dados.com.cn using their web browser without the need for installation or powerful hardware.
基金financially supported by the National Natural Science Foundation of China(No.61303216,No.61272457,No.U1401251,and No.61373172)the National High Technology Research and Development Program of China(863 Program)(No.2012AA013102)National 111 Program of China B16037 and B08038
文摘With the rapid development of computer technology, cloud-based services have become a hot topic. They not only provide users with convenience, but also bring many security issues, such as data sharing and privacy issue. In this paper, we present an access control system with privilege separation based on privacy protection(PS-ACS). In the PS-ACS scheme, we divide users into private domain(PRD) and public domain(PUD) logically. In PRD, to achieve read access permission and write access permission, we adopt the Key-Aggregate Encryption(KAE) and the Improved Attribute-based Signature(IABS) respectively. In PUD, we construct a new multi-authority ciphertext policy attribute-based encryption(CP-ABE) scheme with efficient decryption to avoid the issues of single point of failure and complicated key distribution, and design an efficient attribute revocation method for it. The analysis and simulation result show that our scheme is feasible and superior to protect users' privacy in cloud-based services.
基金the National Nat-ural Science Foundation of China under Grants 61771163the Natural Science Foundation for Out-standing Young Scholars of Heilongjiang Province un-der Grant YQ2020F001the Science and Technol-ogy on Communication Networks Laboratory under Grants SXX19641X072 and SXX18641X028.(Cor-respondence author:Min Jia)。
文摘Cloud-based satellite and terrestrial spectrum shared networks(CB-STSSN)combines the triple advantages of efficient and flexible net-work management of heterogeneous cloud access(H-CRAN),vast coverage of satellite networks,and good communication quality of terrestrial networks.Thanks to the complementary coverage characteristics,any-time and anywhere high-speed communications can be achieved to meet the various needs of users.The scarcity of spectrum resources is a common prob-lem in both satellite and terrestrial networks.In or-der to improve resource utilization,the spectrum is shared not only within each component but also be-tween satellite beams and terrestrial cells,which intro-duces inter-component interferences.To this end,this paper first proposes an analytical framework which considers the inter-component interferences induced by spectrum sharing(SS).An intelligent SS scheme based on radio map(RM)consisting of LSTM-based beam prediction(BP),transfer learning-based spec-trum prediction(SP)and joint non-preemptive prior-ity and preemptive priority(J-NPAP)-based propor-tional fair spectrum allocation is than proposed.The simulation result shows that the spectrum utilization rate of CB-STSSN is improved and user blocking rate and waiting probability are decreased by the proposed scheme.
文摘An e-tag used on the freeway is a kind of passive sensors composed of sensors and radio- frequency identification （RFID） tags. The principle of the electronic toll collection system is that the sensor emits radio waves touching the e-tag within a certain range, the e-tag will respond to the radio waves by induction, and the sensor will read and write information of the vehicles. Although the RFID technology is popularly used in campus management systems, there is no e-tag technology application used in a campus parking system. In this paper, we use the e-tag technology on a campus parking management system based on the cloud-based construction. By this, it helps to achieve automated and standardized management of the campus parking system, enhance management efficiency, reduce the residence time of the vehicles at the entrances and exits, and improve the efficiency of vehicles parked at the same time.
文摘With the rapid development of modern technology,textbooks have been undergoing great changes from the traditionallypaper-based form to the multimodal form.Multimodality has become a major feature of textbook discourse.Multimodal discourseanalysis is a new approach to discourse analysis based on the semiotic theory of systemic functional linguistics.This paper providesa detailed review of multimodal discourse analysis(hereafter MDA) in modern linguistics and some previous researches on textbookdiscourse.Then it further outlines what have already been done on textbook discourse from the perspective of MDA.
基金Hunan Vocational Education Teaching Reform Research Project(Project number:ZJGB2022427)Hunan Provincial Department of Education Scientific Research Project(Project number:22B0963)Hunan Provincial Natural Science Foundation(Project number:2023JJ60189)。
文摘In recent years,with the rapid advancement of digital technologies,digitization in vocational education has become a major trend.Among these advancements,digital textbooks have emerged at the forefront of digitization,significantly impacting both their form and content.This article aims to analyze the existing issues in the use of digital textbooks in vocational education and emphasize the importance of recognizing the vital role of teachers in the wave of digital textbook innovation.It is crucial to clarify the role and positioning of teachers to avoid inadvertently diminishing their classroom significance while prioritizing technological innovations.Teachers should fully leverage the role of digital textbooks as tools for organizing classroom activities and recognize the core and essence of classroom teaching as digital technologies enter the scope of vocational education.By doing so,teachers can contribute to the high-quality development of modern vocational education.
基金supported by the National Natural Science Foundation of China(Grant No.61309005)the Basic and Frontier Research Program of Chongqing(Grant No.cstc2014jcyj A40015)
文摘Mixed redundancy strategies are generally used in cloud-based systems,with different node switch mechanisms from traditional fault-tolerant strategies.Existing studies often concentrate on optimizing a single strategy in cloud computing environment and ignore the impact of mixed redundancy strategies.Therefore,a model is proposed to evaluate and optimize the reliability and performance of cloud-based degraded systems subject to a mixed active and cold standby redundancy strategy.In this strategy,node switching is triggered by a continual monitoring and detection mechanism when active nodes fail.To evaluate the transient availability and the expected job completion rate of systems with such kind of strategy,a continuous-time Markov chain model is built on the state transition process and a numerical method is used to solve the model.To choose the optimal redundancy for the mixed strategy under system constraints,a greedy search algorithm is proposed after sensitivity analysis.Illustrative examples were presented to explain the process of calculating the transient probability of each system state and in turn,the availability and performance of the whole system.It was shown that the near-optimal redundancy solution could be obtained using the optimizationmethod.The comparison with optimization of the traditional mixed redundancy strategy proved that the system behavior was different using different kinds of mixed strategies and less redundancy was assigned for the new type of mixed strategy under the same system constraint.
文摘This essay attempts to aim English teachers to evaluate and adapt the current English textbooks. According to different levels and majors of the students,English teachers can enhance the teaching materials and their teaching skills. This paper would provide several useful techniques for teachers to make evaluations and adaptations of using teaching materials.
基金This work was supported by the China National Natural Science Foundation No.(61331013)the Young faculty scientific research ability promotion program of Minzu University of China.
文摘Readability is a fundamental problem in textbooks assessment.For low resources languages(LRL),however,little investigation has been done on the readability of textbook.In this paper,we proposed a readability assessment method for Tibetan textbook(a low resource language).We extract features based on the information that are gotten by Tibetan segmentation and named entity recognition.Then,we calculate the correlation of different features using Pearson Correlation Coefficient and select some feature sets to design the readability formula.Fit detection,F test and T test are applied on these selected features to generate a new readability assessment formula.Experiment shows that this new formula is capable of assessing the readability of Tibetan textbooks.
文摘The paper investigates Saudi English textbooks in order to trace the ways in which culture was dealt with in the English curriculum in the last 33 years. To this end, the three textbooks which were published one after another for the third-grade secondary school students in the last three decades were analyzed. The paper finds that in the first book published in 1982, the writer introduced only those cultural elements from outside Saudi Arabia, which could be subordinated to the self-enclosed cohesive Saudi national culture that rested and was shaped on and around the faith of Islam. The same cultural pattern is maintained in the second book published in 1998, but in the third book published in 2013, a huge number of western and multicultural elements were accommodated without any attempt to assimilate them to Saudi national culture. The paper concludes that in these textbooks, culture was taken either as Parsons＇s ＂system＂--pattern-maintaining national culture-or as Rothkopf＇s and Friedman＇s ＂pattern-breaking＂ western culture, but it was seldom treated as Bauman＇s ＂matrix＂.
文摘Vocabulary acquisition is a foundation of second language acquisition.How to memorize vocabulary effectively is a troubling issue both for learners and teachers.The experiments show that the more closely connected between pair words,the higher rate of recurrence with correctness.Focusing on the connection of morphemes in Chinese vocabulary teaching can accelerate students'memories of new words.The author believes morpheme teaching is also evidently effective for those Chinese learners using Chinese characters in Japan.However,after examining the order of words with same morphemes in 14 elementary Chinese textbooks,the authors found that current textbooks have not provided a list of words with same morpheme thus imposing learners'memory burden due to learning repetitive words.Meanwhile,this paper proposes"radial networks"among morphemes with same words,also promotes the expansion of vocabulary by morpheme association.
文摘We intend to establish how species diversity is dealt with, within the study of the ecosystem, in books for the 4th year of Compulsory Secondary Education, ESO （15-16 year-old students）. The analysis was carried out using a key issues dossier based on school science, which not only provides a description of reality, but also introduces a theoretical explanatory framework. Regarding species diversity, we focused on the descriptive approach, considering the link between diversity and trophic relationships, ecological succession and ecosystem stability through change, consequences for biodiversity of human activities and mechanisms to face such consequences; and on the explanatory perspective, which provides an interpretative answer for all the aspects previously mentioned. The findings drawn from textbooks show that biodiversity is linked both to the study of the ecosystem and to the impact of human societies on its maintenance. However, such study is particularly focused on the descriptive, rather than on the explanatory level. So, teachers should improve the study of biodiversity foresting a balance between descriptive and explanatory level.
