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41.
在线社交媒体的蓬勃发展改变了人们获取信息的模式,大量的信息通过社交平台传播,信息内容的真实性把关弱化,各类虚假信息依托社交媒体野蛮生长,网络空间治理,培育健康的网络生态意义重大。本文通过最小化用户之间的虚假信息交互量,研究社交网络中虚假信息传播路径的阻断策略。给定在线社交网络G=(V,E,P,H),H表示用户之间信息交互量,已知虚假信息传播源集合S⊆V,虚假信息交互量最小化问题是从E中选取哪K条边,使得这些边被阻断之后,虚假信息在用户之间的交互总量最小。首先证明了该问题是NP-困难的,进而证明了问题的目标函数计算是#P-困难。其次,证明了该问题目标函数既不是次模函数也不是超模函数。再次,提出了两阶段贪婪算法(TSGA)来解决该问题,即先获取候选集合Esa,然后选取阻断集合E'。最后,通过实际在线社交网络数据对模型和算法的有效性进行了分析,实验表明本文提出的算法比现有算法更加有效。 相似文献
42.
康宁 《赤峰学院学报(汉文哲学社会科学版)》2022,(1)
中央文献排比修辞的频繁使用起到了增强语势、突出重点、使句式结构条理清晰的作用。本文以十九大报告及其俄译本为例,尝试基于译文与俄罗斯媒体中新闻报道的对比结果对排比修辞的俄译策略进行统计分析,提出“提取公因式,合并同类项”“舍弃复现结构,按照原文原意分别译出”“保留复现结构,遵照原文形式依次译出”“改变复现结构,转换复现词词性”以及解释性翻译等五种符合目的语表达习惯的俄译策略,以期对中央文献俄译研究以及中国对外话语体系的建设提供参考与借鉴。 相似文献
43.
大城市更有活力且更年轻化的人口结构,导致大城市的消费者异质性偏好更强,进而可能推动企业家创业边界的降低与城市创业活动的发展。为了识别这一理论机制,本文在Zhelobodko et al.(2012)的分析框架上,通过引入城市规模和消费者异质性偏好假设,构建了一个异质性企业家区位选择与创业的空间经济学模型,考察城市规模通过企业家创业边界对城市创业活动的影响,并基于2000-2016年204个城市的面板数据以及2008年中国经济普查数据进行了实证检验。研究发现:(1)企业家才能越高的企业,相应的产品定价会越低,产品需求量越大,而利润越高;(2)企业家创业边界除了受到城市规模的影响以外,还会受到消费者多样性偏好的影响;(3)消费者多样化偏好更强的城市,城市的创业门槛更低,城市的创业活跃度更高。 相似文献
44.
戴燕 《杭州师范大学学报(社会科学版)》2014,(5)
最近二十年,中国内地学者对六朝文学的关心主要集中在南朝。这是因为受文学观念和意识形态的影响,很长一段时间里,学界对南朝文学的评价过低,导致对它的研究不足。六朝文学研究的近况,从新近出版的三部新整理的古籍可见一斑,它们是《金楼子校笺》《玉台新咏汇校》《文镜秘府论汇校汇考》。它们都算是南朝文学研究的基本文献,其整理一方面仰赖于相关的研究积累,另一方面也必然会推动相关研究领域的深化,因此有着一定的代表性。 相似文献
45.
ABSTRACTThis paper explores the difference in the online economic activities of people with and without disabilities in Korea. We conducted a multiple regression analysis to investigate the impact of socioeconomic characteristics, internet access, and internet skills on online economic activities. Our sample, based on a 2016 dataset that included 1554 people with disabilities and 6004 people without disabilities, was developed using quota sampling based on gender, age, and residence. We determined that individuals with disabilities were more likely to engage in online economic activities if they had higher levels of education, lived in urban areas, were employed, or had greater internet skills. Individuals without disabilities were more likely to engage in online economic activities if they were women, had higher levels of education, were employed, lived in a two-generation or more household, or had greater internet skills. For both people with and without disabilities, the level of education, employment status, and internet skills positively contribute to online economic activites. We also determined that education level, participation in economic activity, living in a two-generation or more household, and internet skills had a statistically significant influence on online economic activity for people both with and without disabilities. These results highlight the importance of education and internet training for people with disabilities, as well as social support systems that help them learn to use the internet in diverse ways through both formal and informal networks. The study also underscores the importance of information and communications technology that adequately addresses people’s needs. 相似文献
46.
《European Management Journal》2017,35(4):538-547
Consumers are fundamental to organisational functioning and survival. Their loyalty, commitment, product acceptance and good long-term relationships with firms and brands are underpinned by their trust. Unfortunately, over the last decade or so, we have witnessed some of the more spectacular violations of consumer trust in the history of business. This has led to negative consequences, such as loss of competitive advantage, rage, lack of commitment and decrease in turnover. Consequently, study of trust repair has become an important theoretical concern for a growing number of trust scholars. This article reviews and synthesises existing theory and research on the topic. It first sketches general characteristics of the consumer trust repair literature, including its meta-theoretical underpinning. It then identifies specific strategies associated with consumer trust repair and synthesises them into five categories of trust repair strategies. In addition, this paper highlights theoretical processes that explain why/how trust repair strategies work. Third, the paper proposes six fruitful avenues for future research. This study contributes to the field of consumer trust repair research by critically reviewing and synthesising emerging theory and research on strategies associated with consumer trust repair, by showing why and how these strategies work and by identifying most fruitful research areas. 相似文献
47.
Junko Kawahara Shigeho Tanaka Chiaki Tanaka Yasunobu Aoki Junzo Yonemoto 《Risk analysis》2012,32(9):1595-1604
Lack of data on daily inhalation rate and activity of children has been an issue in health risk assessment of air pollutants. This study aimed to obtain the daily inhalation rate and intensity and frequency of physical activity in relation to the environment in Japanese preschool children. Children aged four–six years (n= 138) in the suburbs of Tokyo participated in this study, which involved three days' continuous monitoring of physical activity using a tri‐axial accelerometer and parent's completion of a time/location diary during daily life. The estimated three‐day mean daily inhalation rate (body temperature, pressure, saturated with water vapor) was 9.9 ± 1.6 m3/day (0.52 ± 0.09 m3/kg/day). The current daily inhalation rate value of 0.580 m3/kg/day proposed for use in health risk assessment in Japan is confirmed to be valid to calculate central value of inhaled dose of air pollutants in five‐ to six‐year‐old children. However, the 95th percentile daily inhalation rate of 0.83 m3/kg/day based on measurement for five‐year‐old children is recommended to be used to provide an upper bound estimate of exposure that ensure the protection of all five‐ to six‐year‐old children from the health risk of air pollutants. Children spent the majority of their time in sedentary and light level of physical activity (LPA) when indoors, while 85% of their time when outdoors was spent in LPA and moderate‐to‐vigorous physical activity. The results suggest the need to consider variability of minute respiratory ventilation rate according to the environment for more refined short‐term health risk assessment. 相似文献
48.
刑事审后程序是指除审判监督程序外刑事判决生效后一系列程序的总称,包括刑事执行程序、被害人的权利保障程序以及刑罚被执行完毕人员的前科消灭程序等内容。刑事诉讼法学界除了对作为刑事审后程序重要内容的刑事执行程序研究较为充分外,还没有人对刑事审后程序作过系统的专门研究。对刑事审后程序进行系统的理论研究,特别是建立和完善被害人损害赔偿制度和被害人国家补偿制度,建立刑罚被执行完毕人员前科消灭的法律制度,不仅有助于完善我国刑事诉讼法,也有助于社会主义和谐社会的构建。 相似文献
49.
Inappropriately high weight in children is a persistent problem in the United States, and physical activity is often reduced in schools due to academic demands. Effective after-school programs could positively impact both physical activity and overweight/obesity, however previous reviews and meta-analyses have indicated minimal effects. Both 4- and 3-day/week versions of a social cognitive theory-driven physical activity/nutrition after-school program were evaluated against unstructured care to assess effects in children (overall Mage = 10.00 years, SD = .80). For changes over 9 months in body mass index (BMI), effects sizes (Cohen’s d) were .68, .40, and .07 in the 4-day (n = 70), 3-day (n = 70), and unstructured (n = 50) groups, respectively. Similar patterns of effects were found for changes in free-time physical activity and cardiovascular endurance. Incorporating a theory-based prediction model previously supported in teens through older adults, with and without medical disorders and health-risk factors, improvements in exercise-related self-regulation and self-efficacy, and mood, significantly predicted increased free-time physical activity (R2 = .48). Effects significantly strengthened to R2 = .62 when completion/non-completion of the recommended 300 min/week of physical activity was also accounted for. Change in BMI was inversely related to physical activity change, β=-.14, p < .05. The present evaluation process indicated promising effects, and indicated theory-based targets to foster future program improvements. 相似文献
50.
《European Management Journal》2017,35(1):26-38
More than 75% of Fortune 500 companies have established models of shared services with the aim of gaining superior performance by cost savings and service enhancements. Despite scholars' complaints about scant shared service center (SSC) research, this study shows that the actual shortcoming in this stream concerns a high fragmentation of the academic literature (e.g., we found 137 works in the initial search and 83 works in a refined screen). In this first comprehensive literature review, we synthesize peer-reviewed articles and classify them into 4 perspectives according to their research questions (i.e., determinant, process, control, and outcome). We identify 17 major research areas across these perspectives. Additionally, we provide information on methodologies and theories. On the basis of the literature synthesis, we discuss opportunities and gaps and propose an agenda for future research. Specifically, we suggest 3 potential research directions (i.e., direct relationships, mediating, and outcome effects) regarding SSCs during their operational maturity phase. 相似文献