数字证据完整性证明方法研究——安全的、可供审计的数字时间戳证明方法

在数字案件和数字纠纷案件中,数字证据往往成为再现案情、化解纠纷的关键。但数字证据的脆弱性、易毁损性等特点决定了数字证据的完整性难以保障,因而形成了数字证据采信难的问题。在比较研究现有的数字证据完整性证明方法优缺点的基础上,以数字签名技术为支撑的一种数字证据完整性证明的新方法——安全的、可供审计的数字时间戳证明方法,对数字证据的收集、保存分析及传递等取证环节大有帮助。     

Contested meanings,myths and hyperimages of the apocalypse: the Bakhtin Circle and the politicisation of catastrophism

This article considers the depoliticising effects of current images and myths of apocalyptic visions, such that the world faces a catastrophe whether this emerges from environmental degradation, mass migration, terrorism, or global financial collapse. In our digital media age, apocalyptic images are now also captured through the raw footage of actual disaster events. In the article we call such footage, “hyperimages”. The power of the hyperimage is not, as Baudrillard once said, that reality is “just like the movies”, rather, hyperimages demonstrate that the image captured and shown to others is all too real because they depict actual everyday disasters. Importantly, such is the power of hyperimages that they are often employed by the political right to help them construct a hegemonic project aiming to win state power and to influence state policies. Drawing on the Bakhtin Circle, however, we show that hyperimages are also mediated and circulated through a multitude of social groups and voices in society, which contain seeds of radical heteroglossic alternatives to that of the right. Following this, the article then examines how responses to apocalyptic hyperimages can be politicised in a progressive direction.     

Why Place Really Matters: A Qualitative Approach to Housing Preferences and Neighborhood Effects

The idea that a person’s neighborhood or zip code can predict his or her life outcomes has motivated a host of housing policies aimed at redressing racial segregation and breaking up areas of concentrated poverty. This article critically examines underlying assumptions about high-poverty neighborhoods that motivate those policies. Using ethnographic methods, I present the location preferences of residents living in a low-income neighborhood in Columbus, Ohio, and show the ways in which their perceptions of their neighborhood run counter to common portrayals. This analysis provides clues as to why the underlying logic of dispersal and mobility may be flawed. I conclude that place matters very much to people living in this neighborhood, just not in the way commonly implied by dispersal and mobility policy advocates. The implication is that stability, rather than mobility, ought to be the focus of more housing discussions.     

It’s Good but Is It Right? An Under-the-Hood View of the Location Affordability Index

In 2012, the U.S. Department of Housing and Urban Development (HUD) released the Location Affordability Index (LAI) as an online portal and downloadable data set. The LAI has elevated the U.S. conversation on affordability to include transportation and access to opportunities, and has been used in state and federal programming, by researchers, and by private households. However, although some researchers have noted concerns with and potential limitations of the data, none has provided practitioners and researchers with an under-the-hood view of the data, analysis of its reliability or validity, or its conceptual limitations. This article recommends methodological improvements dealing with issues of variable construction, aggregation, and modeling. A recreation of the LAI at the census-tract level suggests the LAI overestimates both costs and cost burden, but especially among renters, and especially in metropolitan areas. On the transportation side, model recreation requires partnership and resourcing to both gain access to restricted data and to develop a reliable database on transit supply and use.     

Democratic engagement in the digital age: youth,social media and participatory politics in Kenya

As the communication world becomes more complex and participatory, social networking sites (SNSs) have emerged as a platform with the potential to invigorate democracy and political engagement. However, the value of SNSs in politics remains contested among researchers. The study reported on in this article was based on a survey of 600 university students, aged between18 and 35, to examine the relationship between social media use and political engagement among the youth in Kenya. The study focused on the extent to which SNSs facilitate consumption of political information and the role of SNSs in influencing political interest, knowledge and behaviour among the youth. The study found that reliance on SNSs is positively associated with political participation; however, this influence is limited, and though useful, it does not radically transform political engagement. Therefore, the capacity of SNSs to shape opinion and influence political preferences is limited but internet based political activities like posting and distributing campaign information and consumption of political content have a bearing on political participation. The study concluded that while SNSs do not seem to have a major direct impact on political choices among users, politicians and other campaign actors cannot ignore the opportunity provided by these platforms in the voter mobilisation process.     

Disentangling Actors from Their Environment? Pitfalls and Added-Value of the Strategic-Choice Approach

ABSTRACT

This article argues that the Strategic-Choice Approach (SCA) put forward by Lake and Powell (1999b) can be further developed in two directions. First, the article highlights the challenge posed by the interdependence between actors and their environment. From this it draws two conclusions. A) The SCA approach is most fruitful for synchronic analysis but more challenging to implement in a diachronic research design. B) The interdependence between actors and their environment can be lessened by distinguishing between three types of actor preferences: meta, ranked, and pragmatic-preferences. Second, it argues that the SCA is an ideal framework to combine qualitative and quantitative research designs.     

Professionals’ Experiences With and Perceptions of Children Exposed to Severe and Homicidal Violence in Sweden

The present study aimed to examine professionals’ experiences, perceptions, and knowledge regarding violence-exposed children in order to clarify the status and opportunities these children have in the Swedish legal system. A questionnaire was distributed to 63 professionals, representing police, prosecutors, social personnel, and treatment personnel. Findings revealed several problems that hindered effective work. Routines and guidelines were lacking and knowledge gaps regarding these children were found among all professions. Perceptions that children remember and tell were widely held, although conditions enabling sufficient reports are seldom met. Results can be used to guide necessary changes in national routines and guidelines to ensure recovery and maintaining of societal rights of this group of psychologically abused victims.     

It Takes a Village: Protecting Rural African American Youth in the Context of Racism

Prior research demonstrates negative consequences of racism, however, little is known about community, parenting, and intrapersonal mechanisms that protect youth. Using a mixed-methods approach, this study illuminated linkages between positive and negative contextual influences on rural African American adolescent outcomes. Quantitative results provide support for Structural Ecosystems Theory, in that the influence of discrimination and collective socialization on adolescent outcomes was mediated by racial socialization and positive parenting. Parenting and community influences contributed to adolescent racial identity and self image, which protected against common negative responses to racism; including academic underachievement, succumbing to peer pressure, and aggressive tendencies. Qualitative results indicate that current measures of discrimination may underestimate adolescents’ experiences. Adolescents reported racist experiences in the domains of school, peers, and with the police (males only). Moreover, qualitative findings echoed and expanded quantitative results with respect to the importance of the protective nature of parents and communities.

Continuing education: Toward a life-course perspective on social learning

Sutherland's differential association theory and the life-course perspective have at times been conceptualized as contrasting theories of criminal behavior. I argue instead that our understanding of delinquency, the dynamics underlying criminal persistence and desistance, and intergenerational patterns will be enhanced by a more explicit integration of these two traditions. I focus on family processes as these are foundational intimate relationships that remain underappreciated as a source of lifelong learning and influence. Although family support and variations in parental supervision have been amply investigated, “direct transmission” takes place within the family as well as within the confines of the more heavily studied world of adolescent peer groups. I identify five dimensions of direct transmission and illustrate these dynamic processes with qualitative data from two longitudinal studies and results of recent quantitative analyses. The analysis is generally in line with Sutherland's original formulation but includes several extensions and modifications. It is important to include a role for human agency, and for “noncriminal” definitions and lifestyle factors, in addition to the directly criminogenic definitions Sutherland and subsequent researchers have emphasized. The focus on social processes is, however, consistent with Sutherland's goal of highlighting limitations of psychological and biological differences explanations.