重新定义电影:影像体感经验与电影现象学思潮

在世纪之交电影“大理论”受到全盘质疑的大背景下,当代关涉电影本性、电影叙事、观影体验以及影像与观众关系等重要观念的电影现象学思潮,不仅为我们重新认识和定义电影提供了鲜活独特的切入角度,促使我们更完整丰满地思考电影这一19世纪诞生的“老媒体”,而且也开拓、启迪了“大理论”退潮后僵止的理论路径,有助于我们思辨性地把握和理解数字“新媒体”条件下日益普在性的影像与人类、屏幕与日常生活浑然一体的社会文化转型.     

电视信号的加解扰

随着有线电视技术的飞速发展,有线电视用户迅猛增加,而系统的管理落后、上门收费被动,给有线电视经营者带来困扰,需要行之有效的措施来抵制不交费的用户。同时,随着有线电视向宽带多功能综合网发展,每个用户有不同的服务要求。因此,迫切需要研制出先进的加解扰技术,建立一个标准化、规范化、适合我国国情的有线电视新型网络。     

高校信息管理系统的安全关键技术

高校信息管理系统面临的安全威胁问题日趋多样化和复杂化,系统通过统一身份认证、访问控制、数字签名等一系列安全技术设计并实现了实用有效的安全防范机制,为高校信息化办公提供有力的保证。     

Keywords and Cultural Change: Frame Analysis of <Emphasis Type="Italic">Business Model</Emphasis> Public Talk, 1975–2000

Keywords chronicle and capture cultural change by creating common categories of meaning against diverse local usages. We call this the global-local tension. To test competing theories of this tension, we employ frame analysis of more than 500 journal abstracts over a 25-year period, tracking the spread of business model as an economic keyword generated during unsettled economic times. Analyses reveal the simultaneous adoption of “global” and “local”frames without one supplanting or co-opting the other. The global-local tension is conciliated by providing primacy across communities of discourse to a small collection of frames (i.e., the global presence) while maintaining a plurality of local use within communities (i.e., the local alternative).     

Scale-up modes: Profiling activity configurations in scaling strategies

Scale-ups, or scaling firms, provide an important contribution to the economy. However, there is little understanding of the characteristics of their scaling strategies, compared to the high-growth strategies of start-ups and mature firms. To address this, we build on the Penrosean view of firm growth and the literature on high-growth firms to identify the critical growth-enabling activities of scaling firms with digital business models: financing, innovation, digitization, and acquisitions. Using cluster analysis of a sample of 184 Unicorn and emerging Unicorn scale-ups with digital business models, we identify four distinct activity configurations, or scale-up modes: network growers, focused scalers, organic innovators, and constricted scalers. We discuss the theoretical implications for the literature on scaling firms, Penrose's theory of firm growth in the digitization era, and firm growth research more generally.     

The role of absorptive capacity and innovation strategy in the design of industry 4.0 business Models - A comparison between SMEs and large enterprises

Technological innovations often lead to redesigns in the business models of established companies, requiring them to incorporate new external knowledge into internal activities. Against this background, this study integrates the concepts of business model design, absorptive capacity, and innovation strategy into a novel research model, which analyzes the redesign of established business models in response to the emergence of Industry 4.0. Industry 4.0, also known as the Industrial Internet of Things, constitutes a contemporary research context that is highly relevant for corporate practice but scarcely regarded in management literature until now. The article contains an analysis of data from 221 German industrial enterprises, conducted through structural equation modeling, with separate data for small and medium-sized enterprises (SMEs) and large enterprises. First, the results indicate that the acquisition, assimilation, transformation, and exploitation of knowledge from the environment enable companies to engage in both exploratory and exploitative innovation strategies. Furthermore, the paper includes an evaluation of the role of exploratory and exploitative innovation strategies that reflects in efficiency-centered and novelty-centered business model designs. The distinct characteristics differentiating SMEs from large enterprises are also explained. The implications of absorptive capacity on innovation strategies, which influence the redesign of extant business models, are discussed from a research and managerial perspective.     

Inequality in mobilizing online help after a negative life event: the role of education,digital skills,and capital-enhancing Internet use

Many studies have investigated inequalities in coping with stressful life events and often education is found to play a role in this (the higher educated are usually more successful in dealing with their problems in terms of well-being consequences). We examine whether something similar occurs on the Internet, whether the higher educated are more successful in mobilizing help online, and whether this is related to their digital skills and the way in which they use the Internet. With the latter, we link online coping to digital inequality research. Researchers have investigated digital inequalities with regard to skills and types of Internet use. However, we know little about the extent to which these factors translate into inequalities in resources mobilized from the Internet. This latter type of inequality is highly relevant, since it is an intermediary step between Internet use and (improved) well-being and life chances. Using a large sample of individuals living in the Netherlands, we find educational differences in the mobilization of online problem-focused coping resources, but no differences with regard to online socioemotional or disengagement coping resources. The educational inequalities in online coping are somewhat smaller than educational inequalities in offline coping, leading to remarkable consequences for social policy. Furthermore, we find a relatively complex pattern of interrelations between offline inequality (education) and different types of digital inequality (skills, usage, resources). In our conclusions we make a plea for more research on outcomes of Internet use and we discuss the implications of our findings for further research.     

Competitive renaissance through digital transformation

Dramatic health, environmental, and social-related challenges put pressure on firms to rethink their strategies and growth paths. Is a digital-enabled transformation able to help firms cope with these challenges and drive a competitive renaissance of our economic system? Are extant theories and concepts able to interpret the digital transformation? This management focus section aims to advance a relevant and impactful research agenda in the area of “business strategy and digitalization” through 4 contributions – both conceptual and empirical – that contribute to the understanding of the so-called “digital transformation” and its implications for both scholars and practitioners.     

Networked discontent: The anatomy of protest campaigns in social media

We analyze the communication network that emerged in social media around an international protest campaign launched in May 2012. Applying insights from network science and the theory of brokerage, we examine the cohesion of the network with community detection methods, and identify the users that spanned structural holes, creating bridges for potential information diffusion. We also analyze actual message exchange to assess how the network was used to facilitate the transmission of information. Our findings provide evidence of fragmentation in online communication dynamics, and of a distribution of brokerage opportunities that was both uneven and underexploited. We use these findings to assess recent theoretical claims about political protests in the digital age.     

《数字信号处理》的教学实践与体会

《数字信号处理》是电子信息专业的一门基础课程。将传统教学与多媒体辅助教学相结合,加强Matlab在教学中的应用,即以传统教学为主,多媒体动画演示为辅,使教学内容条理清晰、连贯性强、形象直观、利于理解,能够取得良好的教学效果。