时代呼唤在线《汉语大词典》

在全面修订《汉语大词典》的同时,中国还需要一部与国家形象和时代要求相适应的在线《汉语大词典》。文章在分析国内外电子辞书发展现状的基础上,就在线《汉语大词典》的基本原则、需要解决的问题等提出了建议和设想。     

The canadian traveller problem and its competitive analysis

From the online point of view, we study the Canadian Traveller Problem (CTP), in which the traveller knows in advance the structure of the graph and the costs of all edges. However, some edges may fail and the traveller only observes that upon reaching an adjacent vertex of the blocked edge. The goal is to find the least-cost route from the source O to the destination D, more precisely, to find an adaptive strategy minimizing the competitive ratio, which compares the performance of this strategy with that of a hypothetical offline algorithm that knows the entire topology in advance. In this paper, we present two adaptive strategies—a greedy or myopic strategy and a comparison strategy combining the greedy strategy and the reposition strategy in which the traveller backtracks to the source every time when he/she sees a failed edge. We prove tight competitive ratios of 2 ^k+1−1 and 2k+1 respectively for the two strategies, where k is the number of failed edges in the graph. Finally, we propose an explanation of why the greedy strategy and the comparison strategy are usually preferred by drivers in an urban traffic environment, based on an argument related to the length of the second-shortest path in a grid graph. We would like to acknowledge the support from NSF of China (No. 70525004, No. 70121001 and No. 60736027), and the support from K.C. Wong Education Foundation, Hong Kong.     

Monitoring correlation change in a sequence of random variables

We propose a monitoring procedure to test for the constancy of the correlation coefficient of a sequence of random variables. The idea of the method is that a historical sample is available and the goal is to monitor for changes in the correlation as new data become available. We introduce a detector which is based on the first hitting time of a CUSUM-type statistic over a suitably constructed threshold function. We derive the asymptotic distribution of the detector and show that the procedure detects a change with probability approaching unity as the length of the historical period increases. The method is illustrated by Monte Carlo experiments and the analysis of a real application with the log-returns of the Standard & Poor's 500 (S&P 500) and IBM stock assets.     

Multivariate Real-Time Signal Extraction by a Robust Adaptive Regression Filter

We propose a new regression-based filter for extracting signals online from multivariate high frequency time series. It separates relevant signals of several variables from noise and (multivariate) outliers.

Unlike parallel univariate filters, the new procedure takes into account the local covariance structure between the single time series components. It is based on high-breakdown estimates, which makes it robust against (patches of) outliers in one or several of the components as well as against outliers with respect to the multivariate covariance structure. Moreover, the trade-off problem between bias and variance for the optimal choice of the window width is approached by choosing the size of the window adaptively, depending on the current data situation.

Furthermore, we present an advanced algorithm of our filtering procedure that includes the replacement of missing observations in real time. Thus, the new procedure can be applied in online-monitoring practice. Applications to physiological time series from intensive care show the practical effect of the proposed filtering technique.     

虚拟社区中个人族群身份的视觉化展演 ———以三苗网论坛为例

重点关注于网络空间里族群成员如何将其族群身份进行视觉化的符号展演。在对三茁网论坛注册用户名进行数据统计和结构性访谈后发现,虚拟社区中的成员通过注册用户名、上传图片头像与添加签名档内容三个符号化方式来展演族群身份,其身份展演具有七个特征：泛族群认同、随时性、可视化／视觉化、一定的真实性、无龄感和跨性别。论坛活动的参与有助于族群成员加强其族群认同。     

论在线消费者信息的法律保护

网络环境中,消费者信息的搜集和利用已经逐渐成为商家经营的基本手段,而在这一过程中反映出的消费者信息被侵害的案例已屡见不鲜。从在线消费者信息被侵害的案例说开去,通过分析在线消费者信息被利用的主要形式,从法律视角探析在线消费者信息享有者和利用者的权利义务关系,从而在分析我国目前立法现状的基础上提出完善相关法律的思考和构想。     

‘The language is disgusting and they refer to my disability’: the cyberharassment of disabled people

Disabled people face hostility and harassment in their socio-cultural environment. The use of electronic communications creates an online context that further reshapes this discrimination. We explored the experiences of 19 disabled victims of cyberharassment. Five themes emerged from the study: disability and health consequences, family involvement, misrepresentation of self, perceived complexity, and lack of awareness and expertise. Cyberharassment incidents against disabled people were influenced by the pre-existing impairment, perceived hate-targeting, and perpetrators faking disability to get closer to victims online. Our findings highlight a growing issue requiring action and proper support.     

网约车侵权责任主体的认定

我国《网络预约出租汽车经营服务管理暂行办法》确定了网约车运营的合法地位,但实践中暴露的问题是其发生交通事 故后的侵权责任应如何认定,这是现有制度规范存在缺位的地方,有必要深入研究,解决问题的关键是确定网约车侵权责任的 承担主体。目前,网约车平台公司的出行业务模式主要有“出租车”“快车”“专车”“顺风车”“代驾”,相应的网约车主与网约车 平台公司也存在“居间合同”“劳动合同”“挂靠”等法律关系,根据具体情况,可以由网约车主、网约车平台公司或者网约车主与 网约车平台公司共同承担责任。     

虚拟社区成员参与动机的实证研究——以网络游戏为例

以Richard Bartle的Intere st Graph模型和Nicholas的五因素理论研究成果为基础,我们利用一对一深度访谈和焦点座谈会的研究方法,挖掘出驱动人们参与网络虚拟社区的关键动机,并发展了适应中国网络虚拟社区参与动机的量表.本研究进一步利用该动机量表进行了实证研究,通过数据分析得出了驱动人们参与虚拟社区的八大动机,它们分别为领导、沉溺、攻击与贬低、性、赚钱、角色探索、亲和以及休闲与自由.本研究还发现,成就动机和领导动机并非相互独立,他们相互融合为一个动机.