高级加密标准AES算法的教学思路探索

美国高级加密标准(AES)作为全球通用的加密算法,目前已被广泛研究和使用。鉴于AES的重要性,计算机科学与技术、通信工程、电子信息工程、信息对抗技术等专业的高年级本科生或研究生的选修课中通常将AES加密算法作为一个重要内容列入教学计划。针对这些专业学生的特点和该算法的特殊性(如学生数学基础薄弱、算法内容抽象、课时少等情况),笔者研究了AES的教学思路,包括算法背景、算法分解、算法演示、算法攻击进展等教学要点,并结合教学经验加以分析讨论。     

Accessibility design issues with UK e-government sites

The research seeks to provide the audience and web designers with a higher level of awareness about the level of accessibility problems within the e-government sector, specifically a sampling of 130 sites of the UK members of Parliament. The study applies the results of an online accessibility testing tool to analyze the compliance levels of both UK disability law and Web Content Accessibility Guidelines (WCAG). The research also show which guideline errors are the most prevalent among the sites and raises awareness about the issues of access in e-government. Although the UK's Disability Discrimination Act (DDA) of 1995 provides equality in access of websites to people with disabilities, the results of this study show that total openness of sites to these customers is not widespread and the vast majority of sites display similar non-compliance errors among the guidelines. For each of these issues, there are published methods that web designers can implement to improve the accessibility rankings of their sites and provide greater openness to users with disabilities.     

Supporting mature-aged students from a low socioeconomic background

The aim of the current study was to examine mature-aged student perceptions of university support services and barriers to study. Using a mixed methods approach, interviews and focus groups were conducted with mature-aged students to identify barriers to study, knowledge and use of current student support services, and suggestions to improve upon these services. From these data and an audit of university support services, an online survey was created to examine study barriers and patterns of support service use, as well as, perceptions of proposed support services not currently offered by the university within a larger sample of mature-aged students. Analysis of survey data indicated distinct patterns of barriers and support service use according to socioeconomic status as well as other demographic factors such as, age and enrolment status. Study findings are discussed in terms of generating support services for the retention of mature-aged students of low socioeconomic status and for the retention of mature-aged students in general.     

The profile and progress of neglected and abused children in long-term foster care

ObjectivesThis study compared the profile of neglected and abused children in the Australian foster care system as well as differences between maltreatment types in relation to parental contact, reunification and psychosocial progress in care.MethodThe case files of 235 children entering foster care were examined and their social workers were administered standardised questionnaires at the point of intake. All measures were repeated for those remaining in care 1 year and then again 2 years later.ResultsNeglected children were younger than non-neglected children, more likely to have a physical or mental disability, more likely to experience multiple forms of maltreatment and less likely to pose conduct problems for carers. Neglected children were more likely than non-neglected children to experience a decline in parental contact over time, and were less likely to be reunified with their families of origin. There was minimal difference between neglected and non-neglected in their psychosocial progress while in care. Aboriginal children were more likely to be reunified than non-Aboriginal children when neglect was attributable to transient factors (parental incapacity) but the reverse was true for non-neglected children.ConclusionsThe fact that neglected children more often require a second form of maltreatment before being removed from home suggests that children's services workers are less inclined to remove children for neglect than for other forms of maltreatment. As a consequence, those neglected children who are in care tend to come from more dysfunctional families than non-neglected children do, as evidenced by the relatively poorer parental contact and reunification results of neglected children.Practice implicationsNeglected children differ systematically from non-neglected children and suffer relative disadvantage in relation to multiple forms of maltreatment, parental contact, and reunification. The fact that declines in parental contact among neglected children in care occurred only when indirect contact was provided suggests that, wherever possible, care plans should include face-to-face visits and overnight stays rather than being restricted to less direct forms of contact. The difference in the success of reunification according to type of neglect (chronic or transient) also suggests that parental intervention programs need to focus their efforts on chronic factors rather than transient parental factors.     

论美国最高法院与黑人选举权的平等保护

美国内战后形成的黑人选举权问题长期得不到解决,究其根源在于联邦体制的弊端。最高法院在不同时期,对黑人争取选举权的努力产生了不同影响,值得我们借鉴。     

我国博士生教育规模必须扩大——美国的经验及其启示

制约美国博士教育规模的主要因素是经济发展、教育经费、重大政治事件、科技革命、社会需求、高等教育结构及人口数量等。我国博士教育规模与美国相比还有很大差距,所以"目前我国博士教育规模应该零增长或低增长"的观点是片面的。我国博士教育规模应该继续扩大,而不是停滞,这既是必要的,也是可能的。     

宋代科举制度对世家大族的影响——以山东东平梁颢家族个案为例

宋代科举制度作为选拔官员的重要途径,对宋代的世家大族产生了重大影响。文章以宋代梁颢家族为例,展现了一个名不见经传的普通家庭发展成为延续百余年的世家大族的过程。说明宋代的科举制度在担任为政府选拔官员功能的同时,也是造就世家大族并使之得以维持和发展的重要手段。     

颜之推入北后的文化反思

颜之推一生,历经南梁、北齐、北周和隋四朝。遭逢离乱,数次遇险皆幸而存活。出身南方高门士族的他,南北地域的文化差异、更迭变化的政治环境以及复杂人际交往环境等因素,促使其不断反思自身及南北方文化,并一一倾力于其晚年所著《颜氏家训》中。     

家族涉入对企业双元创新影响的实证分析

聚焦于不同维度家族涉入与企业双元创新之间的关系,以2007—2017年沪深两市A股家族上市公司为研究样本,采用实证检验家族涉入对企业双元创新的影响。研究结果表明,家族涉入可以促进企业探索式创新、抑制利用式创新,外部环境的不确定性可以增强家族涉入对企业双元创新的影响。以期丰富公司治理与双元创新及家族涉入的相关研究并提供一定的实践启示。     

LGBTQ parents’ experiences of community youth sport: Change your forms,change your (hetero) norms

This interpretive study sought to critically examine lesbian, gay, bisexual, transgender, or queer (LGBTQ) parents’ experiences of community organized youth sport. Using a constant comparative method of data analysis, the authors examined perspectives of participants from Australia, Canada, and the United States. Three emergent themes best reflected the parents’ experiences: (a) anticipating sexual stigma and finding accepting communities; (b) confronting assumptions of heterosexuality; and (c) educating but not flag waving. Emphasis is placed on the parents intersecting social identities and notions of privilege (e.g., socio-economic resources and the ability to live in socially progressive areas), and how it altered their experiences within the community youth sport context. The findings call attention to the responsibility of youth sport organisations to create a climate of social change through inclusive language, behaviours, and program design.