Research on cloud computing users’ public safety trust model based on scorecard-random forest

Traditional cloud computing trust models mainly focused on the calculation of the trust of users’ behavior.In the process of classification and evaluation,there were some problems such as ignorance of content security and lack of trust division verification.Aiming to solve these problems,cloud computing users’ public safety trust model based on scorecard-random forest was proposed.Firstly,the text was processed using Word2Vec in the data preprocessing stage.The convolution neural network (CNN) was used to extract the sentence features for user content tag classification.Then,scorecard method was used to filter the strong correlation index.Meanwhile,in order to establish the users’ public safety trust evaluation model in cloud computing,a random forest method was applied.Experimental results show that the proposed users’ public safety trust evaluation model outperforms the general trust evaluation model.The proposed model can effectively distinguish malicious users from normal users,and it can improve the efficiency of the cloud computing users management.     

The buffering effect of flow experience on the relationship between overload and social media users’ discontinuance intentions

There is a growing need to understand why users discontinue using social media platforms. Understanding the antecedents of such decisions and the moderators that govern the antecedent effects can help users reach such decisions, and assist service providers in mitigating them. From a theoretical standpoint, there is a need to enrich the theoretical account of social media discontinuance phenomena. To address these issues, we integrate the “stimulus-organism-response” (S-O-R) framework and flow theory. We consequently portray the direct, indirect and moderating roles of flow experience in mitigating discontinuance intentions. We test this model via a survey of 502 WeChat users. The results support the S-O-R model and indicate that social overload, information overload, and communication overload (stimuli) increase the fatigue feelings (organism) of social media users, which, in turn, increase their social media discontinuance intentions (response). By combining the S-O-R perspective with flow theory, we show that flow experience not only help reduce users’ perceptions of fatigue and discontinuance intentions, but also moderate (weaken) the effects of fatigue on discontinuance intentions. Flow experience, therefore, serves as a means to inhibit the formation of social media discontinuance intentions, even when overload and fatigue persist. The present research also has several valuable theoretical and practical implications.     

How does social media change Chinese political culture? The formation of fragmentized public sphere

Social media promotes a broad discussion about the contemporary public sphere in China. Analyzing the relationship between social media and democratic politics in the unique context of China helps us to rethink a metamorphosis of Habermas’s public sphere model. The study supports the idea that the online public sphere more often than not transforms into a fragmentized formation of the multiple tensions between participatory democracy, journalism transformation and governmental authority. It may be difficult, under a single theoretical framework of civil society, to map out the complexities in Chinese social media. The key point is how a fragmentized structure of the public sphere has been integrated in the power game process of achieving consensus. Based on the special Internet policies and political environment in China, the implication of public sphere theory in Chinese social media is reconsidered.     

Understanding publics’ post-crisis social media engagement behaviors: An examination of antecedents and mediators

This study examines the psychological mechanisms underlying the process that enables publics’ individual differences (e.g., the levels of uncertainty avoidance and social media usage) to give rise to varying post-crisis social media engagement intentions (e.g., information seeking, support seeking, and negative word-of-mouth). The study confirms that this process is serially mediated by perceived threat severity, perceived susceptibility, and negative emotions. These psychological mediators, however, function differently between uncertainty avoidance and social media usage. For uncertainty avoidance, a high arousal negative emotion (e.g., anger, fear) is a more essential step to influence engagement intentions than a low arousal emotion (e.g., shame, guilt). For social media usage, however, the type of aroused negative emotions does not matter. Rather, the relationship social media usage has with information seeking is different from that with support seeking and negative word-of-mouth intentions. Social media usage induces information seeking intentions only through publics’ cognitive appraisals of the situation without the activation of negative emotions, while it induces supporting seeking and negative word-of-mouth intentions through both cognitive appraisals and negative emotion arousals.     

Exploring the differences of users’ interaction behaviors on microblog: The moderating role of microblogger’s effort

On microblog, users interact with microbloggers via three behaviors—forward, comment, and like. Prior studies have paid more attention to forward, little research has investigated the differences between these three behaviors. Besides, there is a lack of an integrated theoretical framework that explores whether the same factors have different impacts on the behaviors. This study investigates the differences that users’ interactions behaviors in the presence of the same factors. Building upon elaboration likelihood model (ELM) and text mining, the propose of this study is to systematically explore the relationships among content features (topical relevance, information richness) of post, source features (credibility, social ties and activeness) of microblogger, and users’ interaction behaviors. More importantly, we explore whether such relationships are contingent on microblogger’s effort (material motivation and information originality). A panel data was constructed using a total of 437,533 posts from Sina-Weibo, the largest micro-blogging platform in China. The empirical results show that topical relevance and social ties significantly affect users’ interaction behaviors. Source credibility and source activeness are partially influence the behaviors. additionally, there are positive and negative effects between information richness and the behaviors, indicating that both the bright and dark side of information richness. In addition, the microblogger’s effort moderate the most of the relationships between content features and the three behaviors. These results indicate that there are differences among the three behaviors. Overall, these findings could offer new insights into the deep understanding of the differences among users’ interaction behaviors on microblog.     

Examining the roles of social media and alternative media in social movement participation: A study of Hong Kong’s Umbrella Movement

During the recent wave of pro-democracy movement across the world, new media technologies play a vital role in mobilizing participants. Much scholarly attention has been paid to the role of social media in empowering grassroots movements, but the rise of alternative media was somehow ignored. This study examines the impacts of social media and alternative media on social movement participation. The data came from a survey of 769 students from eight public universities in Hong Kong at the height of the Umbrella Movement. The findings revealed that acquisition of political information from social media and alternative media is associated with social movement participation through different mechanisms. Specifically, social media serve as an echo chamber where people are motivated to participate by perceiving a homogeneous opinion climate and forming a pro-protest attitude. In contrast, alternative media serve as an attitude intensifier to facilitate social movement participation.     

Does social media use really make people politically polarized? Direct and indirect effects of social media use on political polarization in South Korea

To help inform the debate over whether social media is related to political polarization, we investigated the effects of social media use on changes in political view using panel data collected in South Korea (N?=?6411) between 2012 and 2016. We found that, although there were no direct effects of social media use, social media indirectly contributed to polarization through increased political engagement. Those who actively used social network sites were more likely to engage in political processes, which led them to develop more extreme political attitudes over time than those who did not use social network sites. In particular, we observed a clear trend toward a more liberal direction among both politically neutral users and moderately liberal users. In this study, we highlight the role of social media in activating political participation, which eventually pushes the users toward the ideological poles. The implications of these findings are discussed.     

Understanding the effects of the textual complexity on government communication: Insights from China’s online public service platform

While texts are the primary carriers of information for government decision making, few studies have examined the role of textual complexity in government-citizen communication. Using a variety of natural language processing methods, this paper measured textual complexity from the perspectives of word complexity, logical complexity, and abnormal negative emotion based on the textual data of the 1.15 million online messages left by the citizens to government leaders on China’s online public service platform, and explored its impact on government responses. Based on the Double-hurdle model, this paper found that the government response can be composed of two decision-making processes: response-intention, which indicates whether to respond, and response-level, which represents the extent of response. For response-intention decision-making, the simpler the words and logic of the message, the more likely it is to receive a reply from the government. For response-level decision-making, messages with more complex words and logic received a higher level of government response. Abnormal negative emotion in the message significantly reduced the government’s response intention and response level, and the negative effect of abnormal negative emotion on response intention was much greater than on the response level. This study not only helps to understand how the government makes decisions based on textual information, but also has important value for responsive government construction and equalization of government services.     

Engaging audiences on social media: Identifying relationships between message factors and user engagement on the American Cancer Society’s Facebook page

In this study, a content analysis was conducted with posts from American Cancer Society’s (ACS) Facebook page to explore the relationship between message relevance, source characteristics, and message features with the number of likes, comments, and shares received by them. Limited Capacity Model for Motivated Mediated Message Processing (LC4MP) was used as the theoretical foundation for the study. Findings showed that cancer-related posts received more likes, comments and shares than posts that were not related to cancer. Also, posts by the American Cancer Society received more likes, comments, and shares than other source categories. Findings also indicated that though message features were related to likes, comments, and shares, the nature of relationship and the role of different features varied with each measure. Overall, findings highlight the role of motivational activation through message factors in eliciting user response in social media environments.     

Identifying associations between mobile social media users’ perceived values,attitude, satisfaction,and eWOM engagement: The moderating role of affective factors

Recently, the explosive growth of mobile social media technologies has dramatically transformed individuals’ interpersonal interaction, decision-making, and daily lifestyles. The primary objectives of this current article are to investigate the possible influences of perceived values (hedonic and utilitarian) on WeChat users’ affective responses (attitude and satisfaction) and electronic word-of-mouth (eWOM) engagement. This study represents one of the few that utilized customer-perceived value theory and uses and gratifications theory to establish a conceptual framework to determine consumers’ word-of-mouth behaviors in the WeChat setting. Based on a web-based survey of 408 WeChat users, structure equation modeling was implemented to identify and confirm the hypothesized research model. Overall, the results reveal that hedonic value and utilitarian value positively and significantly impact WeChat users’ attitudes and anticipated satisfaction. Additionally, satisfaction has a significant influence on eWOM engagement. Furthermore, utilitarian value is discovered to exert a significant indirect effect through satisfaction on eWOM engagement. The obtained outcomes offer fresh insight into whether and how mobile social media could promote mobile social media users’ attitudes and gratification which subsequently would facilitate indicators of eWOM engagement in contemporary mobile-mediated context.     

Digital natives’ intention to interact with social media: Value systems and gender

Social media research focuses predominantly on the link between attitude, behaviour and intention, and rarely takes value systems into account. Values are expected, through intervening variables, to affect intention directly or indirectly. Starting from the Theory of Trying, the aim of this study is to investigate how value systems affect digital natives’ intention to interact with social media. By using Fuzzy Set Qualitative Comparative Analysis (fsQCA), an empirical analysis involving data from 116 social media users is carried out to examine how global and domain-specific values, attitude towards trying and gender affect the intention to interact. The results of a configurational analysis show that gender appears to affect many of the configurations leading to the outcome of interest. There are two configurations in which, regardless of gender, global values, domain-specific values and attitude towards trying cause the outcome. The findings indicate that there is no single condition necessary to ensure the outcome, but there are several different configurations of the conditions lead to outcome of interest.     

Research on the anti-synchronization chaos system group ＆large scale distributed system security communication

Chaotic system model about point group symmetry in the phase space was constructed,and the anti-synchronization problem of the chaotic system group was studied.Besides,a kind of chaotic system group anti-synchronization controller was proposed,and the anti-synchronization of the chaos system group was realized.Through experimental observation,the position of chaos system about the subsystem and the source system after the point symmetry transform changed in phase space.The phase space power trajectory,space topology and other original system presented symmetrical structure.By using the above research conclusions,a kind of carrier communication method of anti-synchronization chaos system group was put forward.It solved the increasingly urgent communication security issues of modern complex distributed and large scale communication system with many access signals and parallel transmission.In addition,with permanent magnet synchronous motor chaos model,simulation and validation were conducted.The experimental results show that the method has good application prospect,and is suitable for modern communication system.     

Cross-group or within-group attention flow? Exploring the amplification process among elite users and social media publics in Sina Weibo

As one of the most important forms of communicative behavior, retweeting enhances the importance or visibility of a particular object in social media. Conceptualizing retweeting as a process of amplification, this study examines how attention to a particular set of issues may be increased by the actions of verified users or social media publics on the largest Chinese microblogging website, Sina Weibo. The Granger-causality test was applied to analyze the sequential linkage between original posts and retweets by different user groups across days 1 to 14. The results show that verified users’ original posts on unobtrusive issues triggered related retweets only in their own network, while social media publics’ original posts on both unobtrusive and obtrusive issues triggered related retweets within their own group. In addition, the results demonstrate that amplification of different types of issue exhibits systematically different temporalities, that is, the response to obtrusive issues is more immediate and ephemeral than that response to unobtrusive issues. The findings highlight the possibilities and limitations of grassroots empowerment through social media in China, and provide meso-level evidence about the complex issue of attention flows in social media – whether bottom-up or top-down.     

Social media and political partisanship – A subaltern public sphere’s role in democracy

Social media, as a subaltern public sphere (Fraser, 1990), have a democratic function in providing an alternative platform for minorities and marginalized to defy mainstream discourses in the public sphere. However, social media have been found to have an echo chamber effect, which may be detrimental to democracy. They may help to accelerate the ascendancy of a “post-truth” era in which objective facts are less influential in shaping public opinion than appeals to emotion and personal belief. A study on political polarization, however, showed that selective exposure and avoidance in social media are weak indicators of polarization (Johnson et al., 2017). This study examines the role of social media in democracy and partisan politics. The authors considered that despite the echo chamber effect, social media have a limited part to play in the formation of polarized stances compared with other factors, such as demographics, political orientation, and mass media use. The study tested two main hypotheses: H1: Social media use is associated with political stance that is marginalized in the mainstream media; H2: Political orientation has a stronger relationship than social media use with the stance toward political values and social issues.The results supported both hypotheses. Social media are associated with political stance that is marginalized in the mainstream media. However, when compared with other factors, the relationship between social media and stance becomes less obvious. Although the echo chamber effect may reinforce the original stance, social media do not exhibit a strong relationship with the stance toward political values and social issues. Partisan orientation and use of partisan mass media are found to have stronger links with variations in stance. Social media, however, provide a subaltern public sphere for those excluded from the dominant public sphere, thus extending the public sphere to accommodate multiple opinions and perspectives.     

Why DO citizens engage in government social media accounts during COVID-19 pandemic? A comparative study

The worldwide COVID-19 outbreak that crushed the global economy and healthcare increased the public willingness to acquire more information and enthusiasm to engage online among billions of users through social networks. As more towns, cities, and regions turn to lockdown, government social media accounts (GSMAs) develop as a trustworthy source to obtain information about the COVID-19 pandemic. Thus, investigating the determinants and consequences of citizens' participation behavior on GSMAs is essential. Drawing on the self-determination theory (SDT) and civic volunteer model (CVM), we examine the influence of motivational factors (i.e., intrinsic extrinsic) on citizens' participation behavior on GSMAs, which leads to online civic behavior. Comparative research between China and Pakistan is carried out using data collected through an online survey. This study shows that information-seeking, political benefits, self-development, altruism, and perceived reciprocity are the critical antecedents of citizens' participatory behavior on GSMAs in both countries, resulting in online civic behavior. Furthermore, moderating results reveal that perceived connectivity moderates the relationship between certain motivational factors (intrinsic and extrinsic) and citizens' participatory behavior on GSMAs, whereas trust in government moderates the relationship between participatory behavior on GSMAs and online civic behavior during COVID-19. Theoretical and managerial implications are discussed in detail.     

Network enforcement as denunciation endorsement? A critical study on legal enforcement in social media

Facing the increasing prevalence of hate speech and other personality rights violations on social media, the legislature tries to improve the law enforcement by involving the social media companies. In 2017, the German Bundestag passed a new law, the Network Enforcement Act (NetzDG), which requires website owners to review the content published on their pages upon it being reported by users and to remove it as soon as possible in the event of a breach of the law. This forces social media operators to establish efficient reporting systems which can create breeding grounds for user denunciation. To get an overview of whether this is really the case, we briefly discuss state surveillance and denunciation and analyse the statistics of content blockings and deletions in five countries (USA, Germany, United Kingdom, Russia and Turkey). In Germany the number of blockings and deletions of content has risen for Facebook, Twitter and YouTube due to the NetzDG, but it has also been found that the majority of reports were unjustified as they did not lead to any restriction or deletion of the content. When comparing the German numbers with those of the other countries investigated, it becomes apparent that after the introduction of the NetzDG in Germany, more content is being blocked and deleted. Also, a comparison of the various laws regulating online content in these countries was conducted. It was found that not only Germany has tightened the regulation of online content and that other countries are also trying to transform the Internet into a more hate free environment.     

Should I scan my face? The influence of perceived value and trust on Chinese users’ intention to use facial recognition payment

While China has seen the widespread adoption of facial recognition payment, concerns over the potential risks impede the further growth of user acceptance. Drawing on the perspectives of perceived value and trust, we developed a research model to explore how the Chinese users’ trade-off between perceived benefits (perceived convenience and perceived novelty) and perceived risks (perceived privacy risk and perceived financial risk) influences their usage intention. Based on survey data from 1,200 Chinese mobile payment users, this study uses structural equation modeling to examine the hypotheses. Our results show that perceived convenience positively influences perceived value, while privacy risk and financial risk negatively influence perceived value and trust. Although perceived novelty has no significant effect on perceived value and trust, perceived value positively influences trust, and both of them have a positive effect on the intention to use. Furthermore, our moderation analysis indicates that the influence of perceived value on the intention to use is stronger among users who consider facial information to be more sensitive. The theoretical implications for research as well as the practical implications for practitioners are also discussed.     

Promoting or prohibiting: Understanding the influence of social media on international students’ acculturation process,coping strategies,and psychological consequences

Although the unprecedented prevalence of social media has infiltrated into international students’ daily trajectories and become an indispensable component of their intercultural communication, yet surprisingly few attempts have been implemented to systematically unpack how the innovative technology could play a role in these sojourners’ acculturation experiences and the consequences of migration and cross-cultural adaption. In order to address such research gap, the objective of this present article is to provide a review of academic, peer-reviewed journal studies that examined the potential effect of social media engagement on international university students’ acculturation process, coping strategies, and psychological adjustments during the period from 2010 to 2019. Moreover, building upon conceptualizations from new media and transcultural research literature, a conceptual framework was developed to classify the relevant studies for further analysis. Overall, these theories and studies synthesized in this paper emphasize the vital role of social media in the acculturation, coping behaviors and mental health for ethnic minorities in the host country. Additionally, certain dimensions of attitudes and behaviors through social media could exert the important influence on the psychological adaption. Therefore, conclusions of the research may assist to further inform practitioners who may encounter newcomers’ experiencing intercultural adjustments and psychological issues in the digital media age. Furthermore, this current review may also help educators determine certain barriers that have not been resolved in campus tactics which may influence the acculturation of sojourning populations.     

New Quadrotor Helicopter’s communication and control device based on BASYS3

商业化四轴飞行器上的遥控器功能单一,没有DIY 的能力,无法自行编写代码,不利于飞控新功能的开发。利用BASYS3作为主控芯片自行设计了新的遥控器,采用 433 模块进行无线通讯,与飞控板进行有效信息交互;实现了除商用摇杆控制功能以外,还具备语音控制四轴飞行器的功能。与此同时,遥控器还可以实现同时与定高、定点、航拍等相结合的功能,实现四轴飞行器的全面稳定控制,为四轴飞行器后期的开发利用提供了进一步的参考。     

Visible light communication application scenarios based on Android smart devices’ LED lamp

Visible light communication (VLC), which uses visible light to achieve wireless communication just as its name implies, transmits information mainly through the high-speed light flashing of LED or fluorescent lamp. And it has many advantages, such as high security, high energy efficiency, and long life expectancy. In recent years, the application of smart devices based on the Android system is becoming more and more abundant. If the VLC is combined with smart devices based on Android system, we will have a wide range of application scenarios in the future. In this paper, by using LED lamps as the transmission side, two methods of different Android mechanisms to make the flicker in different data rate are presented. By optimizing the code framework, using new function in the hardware driver layer, the operating efficiency can be increased greatly, and the maximum data rate of 5000 bps on the Android development board is achieved. In the meantime, due to the LED’s features and experiments’ result, we give two flowcharts of application scenarios: the mobile payment and ships communication.