改进的AC_BM算法在数据包识别中的应用

对多种类型的网络数据包进行识别,要用到多字符串匹配算法。把AC_BM算法应用到数据包识别中,并对算法加以改进,使其比原算法占用更少的内存资源。     

Eight-year outcome of implementation of abusive head trauma prevention

Low incidence rates and economic recession have hampered interpretation of educational prevention efforts to reduce abusive head trauma (AHT). Our objective was to determine whether the British Columbia experience implementing a province-wide prevention program reduced AHT hospitalization rates. A 3-dose primary, universal education program (the Period of PURPLE Crying) was implemented through maternal and public health units and assessed by retrospective-prospective surveillance. With parents of all newborn infants born between January 2009 and December 2016 (n = 354,477), nurses discussed crying and shaking while delivering a booklet and DVD during maternity admission (dose 1). Public health nurses reinforced Talking Points by telephone and/or home visits post-discharge (dose 2) and community education was instituted annually (dose 3). During admission, program delivery occurred for 90% of mothers. Fathers were present 74.4% of the time. By 2–4 months, 70.9% of mothers and 50.5% of fathers watched the DVD and/or read the booklet. AHT admissions decreased for <12-month-olds from 10.6 (95% CI: 8.3–13.5) to 7.1 (95% CI: 4.8–10.5) or, for <24-month-olds, from 6.7 (95% CI: 5.4–8.3) to 4.4 (95% CI: 3.1–6.2) cases per 100,000 person-years. Relative risk of admission was 0.67 (95% CI: 0.42–1.07, P = 0.090) and 0.65 (95% CI: 0.43-0.99, P = 0.048) respectively. We conclude that the intervention was associated with a 35% reduction in infant AHT admissions that was significant for <24-month-olds. The results are encouraging that, despite a low initial incidence and economic recession, reductions in AHT may be achievable with a system-wide implementation of a comprehensive parental education prevention program.     

Parental involvement and the educational trajectories of youth in Russia

This paper studies the influence of parental involvement in the educational process on the educational achievements of Russian students and their educational strategies, such as studying in high school and successful admission to university. We argue that the patterns of parental involvement represent a link between the formal (school) and informal (family) educational institutions and can have a beneficial effect on academic performance and contribute to the choice of the educational pathway to higher education. Based on data from the longitudinal study ‘Trajectories in Education and Careers’, it was shown that the results of school state examinations are positively associated with the active participation of parents in school meetings, the employment of tutors (except for the Unified State Exam score in mathematics), and the provision of additional literature for the child. A negative relationship was found between homework control and student success. In general, the factor of ‘rational’ (not excessive) involvement is positively associated with educational achievement and educational choice, which may indicate the non-linear nature of the relationship. Parental involvement itself depends on the family characteristics, such as mother’s education, family income and the number of books at home. In addition, family has a positive impact on educational success and educational strategies, and high school characteristics are especially important for the results of the Unified State Exam and the university choice.     

Child welfare outcomes for youth in care as a result of parental death or parental incarceration

Every day, in the United States, children are removed from their homes and placed into state supervised out-of-home care because of concerns around their safety. These children enter care as a result of child abuse, child neglect, abandonment or some other reasons. Lost in most discussions of out-of-home care is the role that parental incarceration and parental death have on the trajectory of children through the child welfare system. In order to address this gap in the literature, the present study aims to compare youth in foster care as a result of parental death or youth in foster care as a result of parental incarceration with youth in care because of child maltreatment in terms of the length of time to achieve permanency. Holding all other variables constant, entering care as a result of parental death more than doubled the average time to exit (HR = 2.32, SE = 0.22), and these youth were significantly less likely to exit to permanency when compared to children entering care for other maltreatment reasons (OR = 0.35, SE = 0.24). Entering care as a result of parental incarceration led to a 24% longer time to exit (HR = 1.24, SE = 0.09) compared to children entering care for other maltreatment reasons. Findings suggest that a one-size-fits-all approach to policy and practice may not be useful to identifying permanent placements for children entering care as a result of parental death or incarceration.     

The impact of generation and socioeconomic status on the value of higher education in the UAE: A longitudinal study

This study explores the differences between student and parents’ value orientation for a college degree across a large sample in the UAE. The value of obtaining a higher education degree in the UAE is transgenerational. Salient benefits of a college degree can be categorized by economic, social and entrepreneurial factors and a model is set forth based on an intrinsic/extrinsic and self vs. other continuum. Education and income are related to valuing several educational outcomes. The most important factor identified across generations included both self-transcendence and self-enhancement values. From 2011–2015, the importance of higher education’s social benefits has increased.     

Parental substance abuse as a predictor of child maltreatment re-reports

This longitudinal study of child abuse and neglect cases closed after investigation examined the impact of parental substance abuse on family functioning and on subsequent referrals to child protective services. The findings support the hypothesis that parental substance abuse would have a negative impact on family functioning, which, in turn, would result in a higher rate of re-reports. As expected, substance abuse also had a direct impact on re-reports. It is critical that the child welfare system recognize and respond to parental substance abuse problems in these families through expanded and improved voluntary, and perhaps, mandatory services.     

运用仿真技术讨论夫琅和费双缝衍射现象

基于MATLAB软件仿真双缝衍射的归一化光强分布曲线和衍射条纹,研究缝宽、中心间距等对光强曲线和衍射条纹的影响,并从理论上对这些变化进行解释。     

黄廖本《现代汉语》(下册)若干问题商榷

文章就黄伯荣、廖序东主编的《现代汉语》（增订三版）语法部分中,动词、量词、代词、介词、形容词、把字句、被字句、双重否定句等部分相关章节所涉及到的原则性及行文表述上的一些问题,阐述了自己的看法。     

思维模式对句法结构的影响

本文首先阐明了语言既是一种社会现象,也是一种文化现象.通过对汉英的一些典型的句式的对比和分析,证实了一个民族的文化、思维模式和语言是相互关联和相互作用的,由此,作者认为句法层面的差异是受不同文化思维模式影响的结果.