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91.
[目的/意义]Web 2.0环境下,短视频UGC新形式的Vlog有效促进了用户间的交流互动及平台的活跃.目前针对Vlog的研究集中于讨论Vlog的分享动机及传播后的影响,但在海量信息传播的社交平台,并非所有的Vlog都有显著的传播效果,但现有文献鲜有关注Vlog流行度的影响因素.[设计/方法]聚焦Vlog的视频特征(视频时长、视频质量以及弹幕数量)与发布者特征(专业性、个人声誉以及个人等级),提出了基于信号理论的研究模型.通过爬取Bilibili平台的18431条Vlog有效数据,采用实证分析方法对模型进行了验证.[结论/发现]视频时长对Vlog流行度产生负向影响,视频质量、弹幕数量、专业性以及个人声誉具有显著的正向影响,而个人等级对Vlog流行度正向影响的假设不成立.该分析结果丰富了已有关于Vlog流行度的研究,并为个人及平台提升Vlog传播效果提出了相关的对策建议. 相似文献
92.
吕干洋 《佛山科学技术学院学报(社会科学版)》1994,(5)
“顾客第一”有其特定的内涵,它充分体现社会主义企业的根本目的,因而是企业所有经营观念中的一个根本性观念,也是企业生产经营的一个根本指导思想。企业要实现其双重目的,促进物质文明和精神文明建设的发展,并树立各种现代经营观念,就必须坚持顾客第一。 相似文献
93.
计算机辅助教学是信息时代的教育手段之一。本文介绍了CAI系统及其应用,并探讨了目前CAI在学校应用中存在的问题、发展策略,说明CAI在学校教育中的重要性和作用。 相似文献
94.
Lu Rongzhang 《长江大学学报(社会科学版)》1998,(5)
在非空集合的子集簇中引入一种自映射边界运算,以此为基础建立拓扑空间的概念,并且论证了一个集在边界运算下的象与其在该拓扑空间中边界的等价性 相似文献
95.
96.
Chinese version of the OSI: A validation study 总被引:5,自引:0,他引:5
Luo Lu Cary L. Cooper Yen Ching Chen Chia Ho Hsu Hung Luan Wu Jian Bin Shih Chi Hua Li 《Work and stress》1997,11(1):79-86
This article examines the construct validity of the Occupational Stress Indicator (OSI) in its Chinese version as well as its criterion-oriented validity against self-reported data on absenteeism and accidents, using a final sample of 1054 workers in the Chinese manufacturing and power industries. The divergent and convergent validities of five of the OSI scales—Job satisfaction, Physical ill-health, Mental ill-health, Type A behaviour and Control—were examined by a multimethod-multitrait matrix technique. Results indicated that the Chinese OSI had fairly good validity in relation to other well-established measures as well as relevant organizational behaviours. 相似文献
97.
Compliance Versus Risk in Assessing Occupational Exposures 总被引:1,自引:0,他引:1
Rogelio Tornero-Velez Elaine Symanski Hans Kromhout Rong C. Yu Stephen M. Rappaport 《Risk analysis》1997,17(3):279-292
Assessments of occupational exposures to chemicals are generally based upon the practice of compliance testing in which the probability of compliance is related to the exceedance [γ, the likelihood that any measurement would exceed an occupational exposure limit (OEL)] and the number of measurements obtained. On the other hand, workers’ chronic health risks generally depend upon cumulative lifetime exposures which are not directly related to the probability of compliance. In this paper we define the probability of “overexposure” (θ) as the likelihood that individual risk (a function of cumulative exposure) exceeds the risk inherent in the OEL (a function of the OEL and duration of exposure). We regard θ as a relevant measure of individual risk for chemicals, such as carcinogens, which produce chronic effects after long-term exposures but not necessarily for acutely-toxic substances which can produce effects relatively quickly. We apply a random-effects model to data from 179 groups of workers, exposed to a variety of chemical agents, and obtain parameter estimates for the group mean exposure and the within- and between-worker components of variance. These estimates are then combined with OELs to generate estimates of γ and θ. We show that compliance testing can significantly underestimate the health risk when sample sizes are small. That is, there can be large probabilities of compliance with typical sample sizes, despite the fact that large proportions of the working population have individual risks greater than the risk inherent in the OEL. We demonstrate further that, because the relationship between θ and γ depends upon the within- and between-worker components of variance, it cannot be assumed a priori that exceedance is a conservative surrogate for overexposure. Thus, we conclude that assessment practices which focus upon either compliance or exceedance are problematic and recommend that employers evaluate exposures relative to the probabilities of overexposure. 相似文献
98.
Energy conservation in mobile ad hoc networks is of paramount importance because most mobile nodes usually have very limited
energy supply. Previous research on this issue focused on the design at the network or MAC or physical layer. In this paper,
we study this problem from the new perspective of node mobility, i.e., analyzing the impact of node movement on energy conservation.
In particular, armed with the inherent resource heterogeneity in mobile ad hoc networks, we propose a novel resource-aware
movement strategy to make better use of some powerful nodes to achieve energy conservation. We also formulate the resource-aware
movement as a NP-complete distance-constrained least-cost (DCLC) routing problem and propose an efficient heuristic solution.
Extensive simulations have been used to demonstrate the effectiveness of the proposed schemes. 相似文献
99.
需求解析与隐性需求的界定 总被引:26,自引:0,他引:26
目前,营销学中关于需求概念与营销导向的研究成为学者日益关注的领域。本文通过文献分析,从信息经济和价值感知两方面描述阐释了需求研究的相关成果;并通过实证分析,发现企业营销倾向在经历了产品导向、服务导向与关系导向的演变之后,需求导向的重要性不断提升。由此,本文界定了隐性需求的内涵,探讨了隐性需求研究对于拓展营销学研究视野的理论价值和实际意义。 相似文献
100.