The diffusion of all-media content plays a vital role in guiding public opinion and ideology.However,at present,most of the media content exists on all kinds of mainstream media platforms,which poses great challenges ...The diffusion of all-media content plays a vital role in guiding public opinion and ideology.However,at present,most of the media content exists on all kinds of mainstream media platforms,which poses great challenges to the effective supervision of relevant departments and society.This has led to arbitrary charges,chaotic media content,difficulties in supervision and evidence collection,and infringements of the rights and interests of original content creators.To address these problems,this paper constructs a trustworthy propagation architecture that supports multi-platform media content sharing.This architecture collaboratively builds an audio-visual blockchain through public and consortium blockchains,coupled with an improved ChinaDRM to provide digital rights management and content encryption.Simultaneously,we employ an enhanced Diffie-Hellman key agreement protocol to offer distributed encryption and decryption for media content.Within this model,various media platforms and national regulatory authorities are responsible for content storage and distribution as consortium nodes and public blockchain nodes,respectively.At the same time,users,as light nodes of public chain or service consumers of consortium blockchain,can consume and comment on content.Analysis shows that the trusted communication framework of media content based on the audio-visual blockchain has certain expansibility and practicability.It can facilitate the supervision of mainstream media platforms by national authorities and society through inter-blockchain technology,offering a novel solution for multi-platform trustworthy cooperative information sharing.展开更多
Objective: This study was conducted to explore what media exactly do when disease is emerging and furthermore, to infer the role and the responsibility that media should play. Method: A content analysis with 0.81 inte...Objective: This study was conducted to explore what media exactly do when disease is emerging and furthermore, to infer the role and the responsibility that media should play. Method: A content analysis with 0.81 inter-rater reliability was adopted to categorize SARS-related events shown on the three major newspapers in 117 days, dated from March 13th (the date before the first probable case of SARS in Taiwan was identified) to July 7th (the date after Taiwan was removed from the list of SARS-affected countries by the bulletin of World Health Organization), 2003. Results: There were totally 8923 SARS events related news found in the observed newspapers during the study period. When the epidemic situation is more serious, the media will also lay out more coverage on reporting the related contents. In the reporting contents, the three most influential newspapers in Taiwan mainly emphasized the impact dimension (34.27%). Only 2.16% of the coverage was on the topic of health communication and prevention education. Overall, the opinions of general public are the primary sources of news (46.57%). Health authority was not the main and typical sources information of the press (9.42%). Conclusion: Media is a double-edged sword in the communicable disease control. We suggest that the health authority should take advantage of media to transmit message rapidly to convey related information to public.展开更多
BACKGROUND The present study investigated perfectionism from the bioecological model perspective as a multidimensional construct manifested in forms of excessively high personal standards,exaggerated worries about per...BACKGROUND The present study investigated perfectionism from the bioecological model perspective as a multidimensional construct manifested in forms of excessively high personal standards,exaggerated worries about personal mistakes,doubt in one’s performance,oversized order and organization emphasis,and the importance of parental valuations and expectations.AIM To investigate the relation between perfectionism;the quality of family,peer,and college relationships;and media usage and content interests.METHODS The research was implemented in 2020 with 203 students(134 female,66%)aged 18-25 years,enrolled at the University of Osijek in Croatia.The questionnaire had five parts:A)sociodemographic data;B)the Multidimensional Perfectionism Scale;C)the“general life satisfaction”and“current situational life satisfaction”scale;D)family,peer,and college relationships quality scale;and E)media usage and content interests scale.All of the implemented instruments showed satisfactory reliability.A hierarchical regression analysis was implemented with the aim of establishing significant perfectionism predictors.RESULTS Age and gender were significant predictors of perfectionism.Participants with lower family relationship quality reported higher parental expectations and complaining as well as significantly higher doubts in personal performance and concern about mistakes.Similarly,a lower peer relationship quality predicted doubts in personal performance and stronger concerns about mistakes.The quality of college relationships positively predicted higher perfectionist personal standards and organization.General life satisfaction predicted higher concerns about mistakes,while current situational life satisfaction predicted higher levels of perfectionist organization.Media usage intensity had no significant effect.Adolescent interest in information-educational media predicted higher personal standards as well as concern about mistakes and organization.Higher interests in entertainment media content predicted more concern about mistakes,while interest in negative media content negatively predicted organization in adolescents.CONCLUSION Sociodemographic traits,relationships with family,peers and colleagues,as well as life satisfaction and media content interests represent significant adolescent perfectionism predictors,explaining 14%-28%of individual perfectionism dimensions.展开更多
In cellular networks, the proximity devices may share files directly without going through the e NBs, which is called Device-to-Device communications(D2D). It has been considered as a potential technological component...In cellular networks, the proximity devices may share files directly without going through the e NBs, which is called Device-to-Device communications(D2D). It has been considered as a potential technological component for the next generation of communication. In this paper, we investigate a novel framework to distribute video files from some other proximity devices through users' media cloud assisted D2 D communication. The main contributions of this work lie in: 1) Providing an efficient algorithm Media Cloud Cluster Selecting Scheme(MCCSS) to achieve the reasonable cluster; 2) Distributing the optimum updating files to the cluster heads, in order to minimize the expected D2 D communication transmission hop for files; 3) Proposing a minimum the hop method, which can ensure the user obtain required file as soon as possible. Extensive simulation results have demonstrated the efficiency of the proposed scheme.展开更多
Emerging techniques such as WiFi direct makes the objective of always-on be true. People can easily chat and share files with nearby friends even without AP(Access Point) or cellular coverage. In this paper, we focus ...Emerging techniques such as WiFi direct makes the objective of always-on be true. People can easily chat and share files with nearby friends even without AP(Access Point) or cellular coverage. In this paper, we focus on the channel efficiency issue of APfree Wi-Fi networks, which can be easily constructed in the subway, in a high-speed railway, or when camping in the wild. Today IEEE 802.11 DCF is the most commonly used MAC protocol for Wi-Fi networks, however, due to the control messages and backoff time, channel efficiency in high data rate networks can be extremely low. To solve this, we propose CD-MAC, which allows control messages to be transmitted with data packets concurrently, and thus eliminates the overheads of backoff and explicit contention. To maintain the reception reliability, we redesign the control messages and use signal detection in PHY instead of bits decoding to detect them. In MAC layer, CD-MAC is built upon our Correlation Detection based PHY. We have implemented and evaluated CD-MAC using USRP N210. Evaluation results show that CD-MAC can achieve over 95.5% channel efficiency and provide throughput gains of up to 80%, 60%, and 29.1% compared with DCF, 802.11 ec, and back2F, respectively.展开更多
基金supported by the Fundamental Research Funds for the Central Universities(No.CUC230A013).
文摘The diffusion of all-media content plays a vital role in guiding public opinion and ideology.However,at present,most of the media content exists on all kinds of mainstream media platforms,which poses great challenges to the effective supervision of relevant departments and society.This has led to arbitrary charges,chaotic media content,difficulties in supervision and evidence collection,and infringements of the rights and interests of original content creators.To address these problems,this paper constructs a trustworthy propagation architecture that supports multi-platform media content sharing.This architecture collaboratively builds an audio-visual blockchain through public and consortium blockchains,coupled with an improved ChinaDRM to provide digital rights management and content encryption.Simultaneously,we employ an enhanced Diffie-Hellman key agreement protocol to offer distributed encryption and decryption for media content.Within this model,various media platforms and national regulatory authorities are responsible for content storage and distribution as consortium nodes and public blockchain nodes,respectively.At the same time,users,as light nodes of public chain or service consumers of consortium blockchain,can consume and comment on content.Analysis shows that the trusted communication framework of media content based on the audio-visual blockchain has certain expansibility and practicability.It can facilitate the supervision of mainstream media platforms by national authorities and society through inter-blockchain technology,offering a novel solution for multi-platform trustworthy cooperative information sharing.
文摘Objective: This study was conducted to explore what media exactly do when disease is emerging and furthermore, to infer the role and the responsibility that media should play. Method: A content analysis with 0.81 inter-rater reliability was adopted to categorize SARS-related events shown on the three major newspapers in 117 days, dated from March 13th (the date before the first probable case of SARS in Taiwan was identified) to July 7th (the date after Taiwan was removed from the list of SARS-affected countries by the bulletin of World Health Organization), 2003. Results: There were totally 8923 SARS events related news found in the observed newspapers during the study period. When the epidemic situation is more serious, the media will also lay out more coverage on reporting the related contents. In the reporting contents, the three most influential newspapers in Taiwan mainly emphasized the impact dimension (34.27%). Only 2.16% of the coverage was on the topic of health communication and prevention education. Overall, the opinions of general public are the primary sources of news (46.57%). Health authority was not the main and typical sources information of the press (9.42%). Conclusion: Media is a double-edged sword in the communicable disease control. We suggest that the health authority should take advantage of media to transmit message rapidly to convey related information to public.
文摘BACKGROUND The present study investigated perfectionism from the bioecological model perspective as a multidimensional construct manifested in forms of excessively high personal standards,exaggerated worries about personal mistakes,doubt in one’s performance,oversized order and organization emphasis,and the importance of parental valuations and expectations.AIM To investigate the relation between perfectionism;the quality of family,peer,and college relationships;and media usage and content interests.METHODS The research was implemented in 2020 with 203 students(134 female,66%)aged 18-25 years,enrolled at the University of Osijek in Croatia.The questionnaire had five parts:A)sociodemographic data;B)the Multidimensional Perfectionism Scale;C)the“general life satisfaction”and“current situational life satisfaction”scale;D)family,peer,and college relationships quality scale;and E)media usage and content interests scale.All of the implemented instruments showed satisfactory reliability.A hierarchical regression analysis was implemented with the aim of establishing significant perfectionism predictors.RESULTS Age and gender were significant predictors of perfectionism.Participants with lower family relationship quality reported higher parental expectations and complaining as well as significantly higher doubts in personal performance and concern about mistakes.Similarly,a lower peer relationship quality predicted doubts in personal performance and stronger concerns about mistakes.The quality of college relationships positively predicted higher perfectionist personal standards and organization.General life satisfaction predicted higher concerns about mistakes,while current situational life satisfaction predicted higher levels of perfectionist organization.Media usage intensity had no significant effect.Adolescent interest in information-educational media predicted higher personal standards as well as concern about mistakes and organization.Higher interests in entertainment media content predicted more concern about mistakes,while interest in negative media content negatively predicted organization in adolescents.CONCLUSION Sociodemographic traits,relationships with family,peers and colleagues,as well as life satisfaction and media content interests represent significant adolescent perfectionism predictors,explaining 14%-28%of individual perfectionism dimensions.
基金supported by the National Natural Science Foundation of China(Grant No.61322104,61571240)the State Key Development Program of Basic Research of China(2013CB329005)+3 种基金the Priority Academic Program Development of Jiangsu Higher Education Institutionsthe University Natural Science Research Foundation of Anhui Province(No.KJ2015A105,No.KJ2015A092)The open research fund of Key Lab of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications),Ministry of Education(NYKL201509)The open research fund of the State Key Laboratory of Integrated Services Networks,Xidian University(ISN17-04)
文摘In cellular networks, the proximity devices may share files directly without going through the e NBs, which is called Device-to-Device communications(D2D). It has been considered as a potential technological component for the next generation of communication. In this paper, we investigate a novel framework to distribute video files from some other proximity devices through users' media cloud assisted D2 D communication. The main contributions of this work lie in: 1) Providing an efficient algorithm Media Cloud Cluster Selecting Scheme(MCCSS) to achieve the reasonable cluster; 2) Distributing the optimum updating files to the cluster heads, in order to minimize the expected D2 D communication transmission hop for files; 3) Proposing a minimum the hop method, which can ensure the user obtain required file as soon as possible. Extensive simulation results have demonstrated the efficiency of the proposed scheme.
基金partially supported by the National NSF of China under Grant 61472445,61631020 and 61702545
文摘Emerging techniques such as WiFi direct makes the objective of always-on be true. People can easily chat and share files with nearby friends even without AP(Access Point) or cellular coverage. In this paper, we focus on the channel efficiency issue of APfree Wi-Fi networks, which can be easily constructed in the subway, in a high-speed railway, or when camping in the wild. Today IEEE 802.11 DCF is the most commonly used MAC protocol for Wi-Fi networks, however, due to the control messages and backoff time, channel efficiency in high data rate networks can be extremely low. To solve this, we propose CD-MAC, which allows control messages to be transmitted with data packets concurrently, and thus eliminates the overheads of backoff and explicit contention. To maintain the reception reliability, we redesign the control messages and use signal detection in PHY instead of bits decoding to detect them. In MAC layer, CD-MAC is built upon our Correlation Detection based PHY. We have implemented and evaluated CD-MAC using USRP N210. Evaluation results show that CD-MAC can achieve over 95.5% channel efficiency and provide throughput gains of up to 80%, 60%, and 29.1% compared with DCF, 802.11 ec, and back2F, respectively.
