Set as the primary and ultimate goal of language teaching process by MacIntyre et al.(1998),willingness to communicate in second language(L2 WTC) has been put much attention in L2 acquisition field.This study examined...Set as the primary and ultimate goal of language teaching process by MacIntyre et al.(1998),willingness to communicate in second language(L2 WTC) has been put much attention in L2 acquisition field.This study examined quantitatively the willingness to communicate in English as a foreign language(EFL WTC) in Tibetan context with a questionnaire.Tibetan college students' EFL WTC was found significantly lower than Han students.No significant difference was found between Tibetan male and female students in their EFL WTC.Causes were explored andsome pedagogical suggestions were made in this study.展开更多
Willingness to communicate illustrates anyone’s tendency and wish to commence a communication.Besides,socio-cognitive strategies are used when people want to interact with others and face some difficulties.The aim of...Willingness to communicate illustrates anyone’s tendency and wish to commence a communication.Besides,socio-cognitive strategies are used when people want to interact with others and face some difficulties.The aim of this study was twofold.The first aim was to investigate the difference in willingness to communicate between Iranian male and female.The second aim was to distinguish the frequency of socio-cognitive strategies used by Iranian advance students based on their gender.To these ends,32 advance learners(16 males and 16 females)were given the willingness to communicate questionnaire developed by MacIntyre,Baker,Clément,and Conrod(2001)and the socio-cognitive strategy use questionnaire.The range of the participants’age was 17-23 in both males and females.To analyze the result of the socio-cognitive strategies use,frequencies were counted.The result showed that although there were some similarities and differences between males and females while using socio-cognitive strategies,the differences were more in social strategies than cognitive ones.After collecting the data from the questionnaires and calculating the means of the two groups,an independent sample T-test was run to compute the significant differences between the two groups.The result of the willingness to communicate questionnaire revealed that males had more tendency in communication than females.Also,the result of the socio-cognitive strategy questionnaire showed that both groups are similar in cognitive strategy use,but they are different in social strategy use.展开更多
As increasingly large number of Chinese students study abroad,Chinese students'classrooms behavious have captured attention.In addition to analyzing the factors affecting the learners'willingness to communicat...As increasingly large number of Chinese students study abroad,Chinese students'classrooms behavious have captured attention.In addition to analyzing the factors affecting the learners'willingness to communicate(WTC) in second language(L2),the paper also aims to examine validity of the heuristic model of MacIntyre et al.(1998) in this particular context.Results show that interlocutor,topic and conversational context are the three main situational variables found to affect the Chinese learners'L2 WTC.展开更多
A great challenge in neuroscience has been to understand how neurons communicate.The neuroanatomists of the 19th Century could see neurons stretching processes to contact other neurons,but could not see the detail of ...A great challenge in neuroscience has been to understand how neurons communicate.The neuroanatomists of the 19th Century could see neurons stretching processes to contact other neurons,but could not see the detail of the contact.Many thought that neurons formed a syncytium,with continuity of membranes from one to the next.Over the ensuing two hundred years or so,we have come to understand that the circuity of the brain is not formed by a syncytium of neurons;rather,individual neurons communicate with each other with a range of biological signals.Neurons are highly active cells,with their activity being electrical and their communication being either chemical,electrical or gaseous.展开更多
As a new affective variable in the field of L2 （Second Language） Acquisition, the study of WTC （Willingness to Communicate） has attracted widespread attention since the 1990s, which is not only an effective way to...As a new affective variable in the field of L2 （Second Language） Acquisition, the study of WTC （Willingness to Communicate） has attracted widespread attention since the 1990s, which is not only an effective way to promote language learning but also an important language target itself. Based on the data got from the questionnaire, the present study intends to explore the level, gender difference, correlation with academic .performance, and influencing factors of English majors＇ WTC inside classroom using both quantitative and qualitative research method. The results reveal that English majors＇ WTC inside classroom is comparatively high; there is no significant gender difference in English majors＇ WTC inside classroom, and there is significant positive correlation between WTC inside classroom and academic achievement; furthermore, language capacity, language anxiety, and communicative atmosphere are the main influencing factors展开更多
ZHEJIANG Province in southeast China borders the East China Sea to its east, Fujian Province to its south, Anhui and Jiangxi Province to its west, and Jiangsu Province and Shanghai to its north. Its 101,800-sq-km land...ZHEJIANG Province in southeast China borders the East China Sea to its east, Fujian Province to its south, Anhui and Jiangxi Province to its west, and Jiangsu Province and Shanghai to its north. Its 101,800-sq-km land area is home to 44.22 million people. Zhejiang has a coastline measuring 6,486 kilometers, the longest in China. Across its vast sea area are scattered over 3,000 islands of a total area of 1,670 square kilometers.展开更多
Communication satellites play an increasingly important role in modern life,they are the information highway in the sky,connecting every corner of the world.Large deployable antennas are one of the core technologies o...Communication satellites play an increasingly important role in modern life,they are the information highway in the sky,connecting every corner of the world.Large deployable antennas are one of the core technologies of communication satellites for efficient and stable communication,forming a huge reflective surface,precisely focusing and reflecting radio waves to ensure high-quality communication with ground stations over long distances.They can not only cover a wider area and provide higher-capacity data transmission,but also maintain stable performance in harsh space environments,ensuring the continuity and reliability of communications.展开更多
This qualitative study aims at exploring the influence of L2 learners' willingness to communicate(WTC) on second language communication. The participants involved in this study were 7 beginners learning Mandarin i...This qualitative study aims at exploring the influence of L2 learners' willingness to communicate(WTC) on second language communication. The participants involved in this study were 7 beginners learning Mandarin in a Chinese university whose native languages were totally different. Multiple sources of data were collected, including classroom observations, semistructured interviews and stimulated recalls. The results indicate that the students with higher level of WTC were more fluent in L2 Chinese communication, and the student whose native language or second language is Russian performed better in Chinese communication.展开更多
In Chinese traditional classes, grammar-based teaching method is widely adopted, and this leads to a phenomenon thatChinese students are usually good at grammar and writing, but poor at speaking. Besides, when Chinese...In Chinese traditional classes, grammar-based teaching method is widely adopted, and this leads to a phenomenon thatChinese students are usually good at grammar and writing, but poor at speaking. Besides, when Chinese students are in a communi-cation-based class, some of them usually feel uncomfortable and are reluctant to communicate. This phenomenon may relate to Chi-nese students' willingness to communicate(WTC).There are a great deal of research has been conducted to WTC related to person-ality, communicative and social environment. However, just small number of exploration has been allotted to the cultural perspec-tive.展开更多
WHEN South African people talk about China, they are usually discussing delicious Chinese cuisine, tradition and history, a developing economy, or even famous kungfu stars. However, Chinese literature is a topic rarel...WHEN South African people talk about China, they are usually discussing delicious Chinese cuisine, tradition and history, a developing economy, or even famous kungfu stars. However, Chinese literature is a topic rarely included, as South African travel writer Shile Khumalo admits - most South Africans, even writers like himself, have never been exposed to Chinese literature throughout their entire life.展开更多
Micro Small Medium Enterprises (MSMEs) in Indonesia play huge part of national economic development because MSMEs can reduce unemployment rate. But, it is not easy to manage MSMEs well so it can be sustainable. There ...Micro Small Medium Enterprises (MSMEs) in Indonesia play huge part of national economic development because MSMEs can reduce unemployment rate. But, it is not easy to manage MSMEs well so it can be sustainable. There are some reasons why MSMEs are difficult to sustain, i.e., good management people by communicate effectively. Authors believe that one of important ability that owners, as a leader, must have in order to communicate effectively is cultural intelligence. Even in MSMEs, cultural intelligence plays important part because employees in MSMEs are diverse. They come from different region (mean having different tradition) and have different level of education. Methodology that is used in this article is qualitative method, and techniques of data collection are interview and observation. Technique of choosing informant is purposive and convenience while data analysis is using content analysis. The result of this study shows that leaders in MSMEs already have cultural intelligence to communicate with their employee. Leaders who have cultural intelligence can choose right method to communicate effectively with their employee.展开更多
the teacher themselves. The teacher are too fastidious and stringent which will make the class become a battlefield. Everyone is afraid of speaking during the class. And furthermore, the way which the teacher uses to ...the teacher themselves. The teacher are too fastidious and stringent which will make the class become a battlefield. Everyone is afraid of speaking during the class. And furthermore, the way which the teacher uses to communicate with student is not suitable. As a common sense, communication is art art, so we should choose the right way to communicate with the child. Furthermore, we need to put more focus on the communication way of teachers, and find out how to let the students communicate in the class. In this short essay, I try to propose some measures to the teacher on this topic of communication in the class.展开更多
Objectives This review aimed to systematically synthesize the available research on the disclosure of diagnosis and related issues in childhood cancer from the perspectives of healthcare professionals,with the goal of...Objectives This review aimed to systematically synthesize the available research on the disclosure of diagnosis and related issues in childhood cancer from the perspectives of healthcare professionals,with the goal of informing the optimization of disclosure processes and meeting the communication needs of affected families.Methods In accordance with the Joanna Briggs Institute(JBI)methodology for mixed methods systematic reviews,the convergent segregated approach was used in this review.Articles were retrieved from 11 databases,including PubMed,Web of Science,CINAHL,CENTRAL,Embase,Ovid/Medline,PsycINFO,PsycArticles,Scopus,ERIC,and China National Knowledge Infrastructure(CNKI).The quality of the selected articles was assessed using the Mixed Method Appraisal Tool(MMAT).The review protocol was registered on PROSPERO(CRD42024542746).Results A total of 21 studies from 10 countries were included.Their methodological quality was generally medium to high,with MMAT scores ranging from 60%to 100%.The synthesis yielded three core themes:1)the spectrum of professional and societal attitudes toward disclosure;2)the dynamic practices of navigating disclosure amid uncertainty,including timing and environment,stakeholders,and content of disclosure;and 3)factors influencing disclosure,including children’s,parental,healthcare professionals’,and socio-cultural factors.Conclusions This review synthesized the perspectives and experiences of healthcare professionals regarding disclosure in childhood cancer,highlighting the complexity and multidimensional nature of this process in clinical practice.Future research should further investigate the experiences and needs of children and their parents,explore cultural variations in disclosure practices,develop context-appropriate assessment tools,and construct multidimensional intervention strategies to enhance the humanistic care and professional effectiveness of the disclosure process.展开更多
Efficient energy utilization in covert communication sustains covertness while assuring communication quality and efficiency.This paper investigates covert communication energy efficiency(EE)in direct uplink satellite...Efficient energy utilization in covert communication sustains covertness while assuring communication quality and efficiency.This paper investigates covert communication energy efficiency(EE)in direct uplink satellite-ground communications,focusing on enhancing system EE via optimized transmit beamforming and satellite orbit altitude selection.This paper first establishes an optimization problem to maximize system EE in a direct uplink satelliteground covert communication scenario.To solve this non-convex optimization problem,it is decomposed into two subproblems and solved using the successive convex approximation(SCA)method.Based on the above methods,this paper proposes an overall iterative optimization algorithm.Simulation results demonstrate that the proposed algorithm surpasses the conventional baseline algorithms in terms of system EE.Furthermore,they elucidate the correlation between the amount of information received by the receiver and the variations in the satellite’s orbital altitude.展开更多
To address the issue of instability or even imbalance in the orientation and attitude control of quadrotor unmanned aerial vehicles(QUAVs)under random disturbances,this paper proposes a distributed antidisturbance dat...To address the issue of instability or even imbalance in the orientation and attitude control of quadrotor unmanned aerial vehicles(QUAVs)under random disturbances,this paper proposes a distributed antidisturbance data-driven event-triggered fusion control method,which achieves efficient fault diagnosis while suppressing random disturbances and mitigating communication conflicts within the QUAV swarm.First,the impact of random disturbances on the UAV swarm is analyzed,and a model for orientation and attitude control of QUAVs under stochastic perturbations is established,with the disturbance gain threshold determined.Second,a fault diagnosis system based on a high-gain observer is designed,constructing a fault gain criterion by integrating orientation and attitude information from QUAVs.Subsequently,a model-free dynamic linearization-based data modeling(MFDLDM)framework is developed using model-free adaptive control,which efficiently fits the nonlinear control model of the QUAV swarm while reducing temporal constraints on control data.On this basis,this paper constructs a distributed data-driven event-triggered controller based on the staggered communication mechanism,which consists of an equivalent QUAV controller and an event-triggered controller,and is able to reduce the communication conflicts while suppressing the influence of random interference.Finally,by incorporating random disturbances into the controller,comparative experiments and physical validations are conducted on the QUAV platforms,fully demonstrating the strong adaptability and robustness of the proposed distributed event-triggered fault-tolerant control system.展开更多
Submission.Papers appearing in the Journal comprise Editorials,Rapid Communications,Perspectives,Tutorials,Feature Articles,Reviews,Research Articles,which should contain original information,theoretical or experiment...Submission.Papers appearing in the Journal comprise Editorials,Rapid Communications,Perspectives,Tutorials,Feature Articles,Reviews,Research Articles,which should contain original information,theoretical or experimental,on any topics in the field of polymer science and polymer material science.Papers already published or scheduled to be published elsewhere should not be submitted and certainly will not be accepted.展开更多
Ningxia is an ethnic gathering area boasting abundant tourism and cultural resources.Developing the cause of tourism and culture is an important way to encourage all ethnic groups to respect differences,embrace divers...Ningxia is an ethnic gathering area boasting abundant tourism and cultural resources.Developing the cause of tourism and culture is an important way to encourage all ethnic groups to respect differences,embrace diversity,and demonstrate their interactions,exchanges,and integration in tourism activities.As an important preserve of the distinctive cultures of the Chinese nation and a prominent world tourist destination,Ningxia should strive to foster and consolidate the sense of a community with a shared future for the Chinese nation in developing its tourism and culture under the new historical conditions.It is imperative to advance the prosperity and development of tourism and culture in boosting ethnic interactions,exchanges,and integration through the formulation of tourism and cultural policies and plans,as well as the development and design of tourism and cultural projects.展开更多
In data communication,limited communication resources often lead to measurement bias,which adversely affects subsequent system estimation if not effectively handled.This paper proposes a novel bias calibration algorit...In data communication,limited communication resources often lead to measurement bias,which adversely affects subsequent system estimation if not effectively handled.This paper proposes a novel bias calibration algorithm under communication constraints to achieve accurate system states of the interested system.An output-based event-triggered scheme is first employed to alleviate transmission burden.Accounting for the limited-communication-induced measurement bias,a novel bias calibration algorithm following the Kalman filtering line is developed to restrain the effect of the measurement bias on system estimation,thereby achieving accurate system state estimates.Subsequently,the Field Programmable Gate Array(FPGA)implementation of the proposed algorithm is also realized with the hope of providing fast bias calibration in practical scenarios.A simulation about a numerical example and a practical example(for gyroscope’s angular velocity bias calibration)on MATLAB is provided to demonstrate the feasibility and effectiveness of the proposed algorithm.展开更多
The smart meter communication system has substantial application value for the construction and upgrading of the entire power system.The deployment of the transmitter(Tx)of the smart meter system in the residential sc...The smart meter communication system has substantial application value for the construction and upgrading of the entire power system.The deployment of the transmitter(Tx)of the smart meter system in the residential scenarios is vexed by the need for more theoretical support.This paper mainly studies the communication channel between the Tx at semibasement and receiver(Rx)at outdoor.The design of an effective communication system relies on an accurate understanding of channel characteristics.Channel measurements and ray-tracing channel modeling are conducted to obtain channel data.The influence of different positions at same semi-basement is studied.Typical channel characteristics are analyzed,such as power delay profile(PDP),power angular profile(PAP),root-mean-square(RMS)delay spread(DS),channel capacity,received power,and path loss.The influence of different semi-basement placements and different floor heights is also compared.Besides,the channel measurements and simulation data fit well,which can illustrate the validity and reliability of the acquired channel data.This paper can provide theoretical support for the design and optimization of smart meter communication systems in semi-basement scenarios.展开更多
文摘Set as the primary and ultimate goal of language teaching process by MacIntyre et al.(1998),willingness to communicate in second language(L2 WTC) has been put much attention in L2 acquisition field.This study examined quantitatively the willingness to communicate in English as a foreign language(EFL WTC) in Tibetan context with a questionnaire.Tibetan college students' EFL WTC was found significantly lower than Han students.No significant difference was found between Tibetan male and female students in their EFL WTC.Causes were explored andsome pedagogical suggestions were made in this study.
文摘Willingness to communicate illustrates anyone’s tendency and wish to commence a communication.Besides,socio-cognitive strategies are used when people want to interact with others and face some difficulties.The aim of this study was twofold.The first aim was to investigate the difference in willingness to communicate between Iranian male and female.The second aim was to distinguish the frequency of socio-cognitive strategies used by Iranian advance students based on their gender.To these ends,32 advance learners(16 males and 16 females)were given the willingness to communicate questionnaire developed by MacIntyre,Baker,Clément,and Conrod(2001)and the socio-cognitive strategy use questionnaire.The range of the participants’age was 17-23 in both males and females.To analyze the result of the socio-cognitive strategies use,frequencies were counted.The result showed that although there were some similarities and differences between males and females while using socio-cognitive strategies,the differences were more in social strategies than cognitive ones.After collecting the data from the questionnaires and calculating the means of the two groups,an independent sample T-test was run to compute the significant differences between the two groups.The result of the willingness to communicate questionnaire revealed that males had more tendency in communication than females.Also,the result of the socio-cognitive strategy questionnaire showed that both groups are similar in cognitive strategy use,but they are different in social strategy use.
文摘As increasingly large number of Chinese students study abroad,Chinese students'classrooms behavious have captured attention.In addition to analyzing the factors affecting the learners'willingness to communicate(WTC) in second language(L2),the paper also aims to examine validity of the heuristic model of MacIntyre et al.(1998) in this particular context.Results show that interlocutor,topic and conversational context are the three main situational variables found to affect the Chinese learners'L2 WTC.
文摘A great challenge in neuroscience has been to understand how neurons communicate.The neuroanatomists of the 19th Century could see neurons stretching processes to contact other neurons,but could not see the detail of the contact.Many thought that neurons formed a syncytium,with continuity of membranes from one to the next.Over the ensuing two hundred years or so,we have come to understand that the circuity of the brain is not formed by a syncytium of neurons;rather,individual neurons communicate with each other with a range of biological signals.Neurons are highly active cells,with their activity being electrical and their communication being either chemical,electrical or gaseous.
文摘As a new affective variable in the field of L2 （Second Language） Acquisition, the study of WTC （Willingness to Communicate） has attracted widespread attention since the 1990s, which is not only an effective way to promote language learning but also an important language target itself. Based on the data got from the questionnaire, the present study intends to explore the level, gender difference, correlation with academic .performance, and influencing factors of English majors＇ WTC inside classroom using both quantitative and qualitative research method. The results reveal that English majors＇ WTC inside classroom is comparatively high; there is no significant gender difference in English majors＇ WTC inside classroom, and there is significant positive correlation between WTC inside classroom and academic achievement; furthermore, language capacity, language anxiety, and communicative atmosphere are the main influencing factors
文摘ZHEJIANG Province in southeast China borders the East China Sea to its east, Fujian Province to its south, Anhui and Jiangxi Province to its west, and Jiangsu Province and Shanghai to its north. Its 101,800-sq-km land area is home to 44.22 million people. Zhejiang has a coastline measuring 6,486 kilometers, the longest in China. Across its vast sea area are scattered over 3,000 islands of a total area of 1,670 square kilometers.
文摘Communication satellites play an increasingly important role in modern life,they are the information highway in the sky,connecting every corner of the world.Large deployable antennas are one of the core technologies of communication satellites for efficient and stable communication,forming a huge reflective surface,precisely focusing and reflecting radio waves to ensure high-quality communication with ground stations over long distances.They can not only cover a wider area and provide higher-capacity data transmission,but also maintain stable performance in harsh space environments,ensuring the continuity and reliability of communications.
文摘This qualitative study aims at exploring the influence of L2 learners' willingness to communicate(WTC) on second language communication. The participants involved in this study were 7 beginners learning Mandarin in a Chinese university whose native languages were totally different. Multiple sources of data were collected, including classroom observations, semistructured interviews and stimulated recalls. The results indicate that the students with higher level of WTC were more fluent in L2 Chinese communication, and the student whose native language or second language is Russian performed better in Chinese communication.
文摘In Chinese traditional classes, grammar-based teaching method is widely adopted, and this leads to a phenomenon thatChinese students are usually good at grammar and writing, but poor at speaking. Besides, when Chinese students are in a communi-cation-based class, some of them usually feel uncomfortable and are reluctant to communicate. This phenomenon may relate to Chi-nese students' willingness to communicate(WTC).There are a great deal of research has been conducted to WTC related to person-ality, communicative and social environment. However, just small number of exploration has been allotted to the cultural perspec-tive.
文摘WHEN South African people talk about China, they are usually discussing delicious Chinese cuisine, tradition and history, a developing economy, or even famous kungfu stars. However, Chinese literature is a topic rarely included, as South African travel writer Shile Khumalo admits - most South Africans, even writers like himself, have never been exposed to Chinese literature throughout their entire life.
文摘Micro Small Medium Enterprises (MSMEs) in Indonesia play huge part of national economic development because MSMEs can reduce unemployment rate. But, it is not easy to manage MSMEs well so it can be sustainable. There are some reasons why MSMEs are difficult to sustain, i.e., good management people by communicate effectively. Authors believe that one of important ability that owners, as a leader, must have in order to communicate effectively is cultural intelligence. Even in MSMEs, cultural intelligence plays important part because employees in MSMEs are diverse. They come from different region (mean having different tradition) and have different level of education. Methodology that is used in this article is qualitative method, and techniques of data collection are interview and observation. Technique of choosing informant is purposive and convenience while data analysis is using content analysis. The result of this study shows that leaders in MSMEs already have cultural intelligence to communicate with their employee. Leaders who have cultural intelligence can choose right method to communicate effectively with their employee.
文摘the teacher themselves. The teacher are too fastidious and stringent which will make the class become a battlefield. Everyone is afraid of speaking during the class. And furthermore, the way which the teacher uses to communicate with student is not suitable. As a common sense, communication is art art, so we should choose the right way to communicate with the child. Furthermore, we need to put more focus on the communication way of teachers, and find out how to let the students communicate in the class. In this short essay, I try to propose some measures to the teacher on this topic of communication in the class.
基金supported by the Fuxing Nursing Research Foundation of Fudan University[FNF202352].
文摘Objectives This review aimed to systematically synthesize the available research on the disclosure of diagnosis and related issues in childhood cancer from the perspectives of healthcare professionals,with the goal of informing the optimization of disclosure processes and meeting the communication needs of affected families.Methods In accordance with the Joanna Briggs Institute(JBI)methodology for mixed methods systematic reviews,the convergent segregated approach was used in this review.Articles were retrieved from 11 databases,including PubMed,Web of Science,CINAHL,CENTRAL,Embase,Ovid/Medline,PsycINFO,PsycArticles,Scopus,ERIC,and China National Knowledge Infrastructure(CNKI).The quality of the selected articles was assessed using the Mixed Method Appraisal Tool(MMAT).The review protocol was registered on PROSPERO(CRD42024542746).Results A total of 21 studies from 10 countries were included.Their methodological quality was generally medium to high,with MMAT scores ranging from 60%to 100%.The synthesis yielded three core themes:1)the spectrum of professional and societal attitudes toward disclosure;2)the dynamic practices of navigating disclosure amid uncertainty,including timing and environment,stakeholders,and content of disclosure;and 3)factors influencing disclosure,including children’s,parental,healthcare professionals’,and socio-cultural factors.Conclusions This review synthesized the perspectives and experiences of healthcare professionals regarding disclosure in childhood cancer,highlighting the complexity and multidimensional nature of this process in clinical practice.Future research should further investigate the experiences and needs of children and their parents,explore cultural variations in disclosure practices,develop context-appropriate assessment tools,and construct multidimensional intervention strategies to enhance the humanistic care and professional effectiveness of the disclosure process.
基金supported in part by the National Natural Science Foundation of China under Grants 62025110,62271093sponsored by Natural Science Foundation of Chongqing,China,under Grant CSTB2023NSCQ-LZX0108.
文摘Efficient energy utilization in covert communication sustains covertness while assuring communication quality and efficiency.This paper investigates covert communication energy efficiency(EE)in direct uplink satellite-ground communications,focusing on enhancing system EE via optimized transmit beamforming and satellite orbit altitude selection.This paper first establishes an optimization problem to maximize system EE in a direct uplink satelliteground covert communication scenario.To solve this non-convex optimization problem,it is decomposed into two subproblems and solved using the successive convex approximation(SCA)method.Based on the above methods,this paper proposes an overall iterative optimization algorithm.Simulation results demonstrate that the proposed algorithm surpasses the conventional baseline algorithms in terms of system EE.Furthermore,they elucidate the correlation between the amount of information received by the receiver and the variations in the satellite’s orbital altitude.
基金supported in part by the National Natural Science Foundation of China,Grant/Award Number:62003267the Key Research and Development Program of Shaanxi Province,Grant/Award Number:2023-GHZD-33Open Project of the State Key Laboratory of Intelligent Game,Grant/Award Number:ZBKF-23-05。
文摘To address the issue of instability or even imbalance in the orientation and attitude control of quadrotor unmanned aerial vehicles(QUAVs)under random disturbances,this paper proposes a distributed antidisturbance data-driven event-triggered fusion control method,which achieves efficient fault diagnosis while suppressing random disturbances and mitigating communication conflicts within the QUAV swarm.First,the impact of random disturbances on the UAV swarm is analyzed,and a model for orientation and attitude control of QUAVs under stochastic perturbations is established,with the disturbance gain threshold determined.Second,a fault diagnosis system based on a high-gain observer is designed,constructing a fault gain criterion by integrating orientation and attitude information from QUAVs.Subsequently,a model-free dynamic linearization-based data modeling(MFDLDM)framework is developed using model-free adaptive control,which efficiently fits the nonlinear control model of the QUAV swarm while reducing temporal constraints on control data.On this basis,this paper constructs a distributed data-driven event-triggered controller based on the staggered communication mechanism,which consists of an equivalent QUAV controller and an event-triggered controller,and is able to reduce the communication conflicts while suppressing the influence of random interference.Finally,by incorporating random disturbances into the controller,comparative experiments and physical validations are conducted on the QUAV platforms,fully demonstrating the strong adaptability and robustness of the proposed distributed event-triggered fault-tolerant control system.
文摘Submission.Papers appearing in the Journal comprise Editorials,Rapid Communications,Perspectives,Tutorials,Feature Articles,Reviews,Research Articles,which should contain original information,theoretical or experimental,on any topics in the field of polymer science and polymer material science.Papers already published or scheduled to be published elsewhere should not be submitted and certainly will not be accepted.
文摘Ningxia is an ethnic gathering area boasting abundant tourism and cultural resources.Developing the cause of tourism and culture is an important way to encourage all ethnic groups to respect differences,embrace diversity,and demonstrate their interactions,exchanges,and integration in tourism activities.As an important preserve of the distinctive cultures of the Chinese nation and a prominent world tourist destination,Ningxia should strive to foster and consolidate the sense of a community with a shared future for the Chinese nation in developing its tourism and culture under the new historical conditions.It is imperative to advance the prosperity and development of tourism and culture in boosting ethnic interactions,exchanges,and integration through the formulation of tourism and cultural policies and plans,as well as the development and design of tourism and cultural projects.
基金support from the National Natural Science Foundation of China(Grant Nos.U2330206,U2230206,62173068)Sichuan Science and Technology Program(Grants Nos.2024NSFSC1483,2024ZYD0156,2023NSFC1962,DQ202412).
文摘In data communication,limited communication resources often lead to measurement bias,which adversely affects subsequent system estimation if not effectively handled.This paper proposes a novel bias calibration algorithm under communication constraints to achieve accurate system states of the interested system.An output-based event-triggered scheme is first employed to alleviate transmission burden.Accounting for the limited-communication-induced measurement bias,a novel bias calibration algorithm following the Kalman filtering line is developed to restrain the effect of the measurement bias on system estimation,thereby achieving accurate system state estimates.Subsequently,the Field Programmable Gate Array(FPGA)implementation of the proposed algorithm is also realized with the hope of providing fast bias calibration in practical scenarios.A simulation about a numerical example and a practical example(for gyroscope’s angular velocity bias calibration)on MATLAB is provided to demonstrate the feasibility and effectiveness of the proposed algorithm.
基金supported by the Natural Science Foundation of Shandong Province under Grant ZR2024MF062the open research fund of National Mobile Communications Research Laboratory,Southeast University under Grants 2025D03+1 种基金the Future Plan Program for Young Scholars of Shandong University,and the Innovation and Technology Support Program for Young Scholars of Colleges and Universities in Shandong Province under Grant 2022KJ009The B6G R&D Group in Shandong University is greatly thanked for channel measurements.
文摘The smart meter communication system has substantial application value for the construction and upgrading of the entire power system.The deployment of the transmitter(Tx)of the smart meter system in the residential scenarios is vexed by the need for more theoretical support.This paper mainly studies the communication channel between the Tx at semibasement and receiver(Rx)at outdoor.The design of an effective communication system relies on an accurate understanding of channel characteristics.Channel measurements and ray-tracing channel modeling are conducted to obtain channel data.The influence of different positions at same semi-basement is studied.Typical channel characteristics are analyzed,such as power delay profile(PDP),power angular profile(PAP),root-mean-square(RMS)delay spread(DS),channel capacity,received power,and path loss.The influence of different semi-basement placements and different floor heights is also compared.Besides,the channel measurements and simulation data fit well,which can illustrate the validity and reliability of the acquired channel data.This paper can provide theoretical support for the design and optimization of smart meter communication systems in semi-basement scenarios.
