二维码OCDMA通信系统的研究

介绍了光正交码和二维光正交码的概念,并对其性能进行了讨论。分析了T/S OCDMA、WDM OCDMA、MW OCDMA三种二维码OCDMA系统,并比较了其性能。给出了二维光正交码光纤延迟线编解码器的设计方案和二维光正交码光纤光栅编码原理。     

论新闻记者社会角色的塑造与完善

社会角色是指与人们的某种社会地位、身份相一致的整套权利、义务的规范与行为模式，它是人们对具有特定身份的人的行为期望，新闻记者要成功地扮演其社会角色，并非是件容易的事，它不仅需要主观的不懈努力，而且需要客观的必备条件。     

从“权力再制”到“文化再制”：教育实践中的符码逻辑——伯恩斯坦符码理论框架下的教育不平等问题

本着“符码是文化再制的内在机制”而非“外在权力关系的转播站”的观点，伯恩斯坦建构了一个新的分析工具——“符码”来探讨西方教育不平等的深层逻辑。他认为西方学校教育并不能有效推动社会阶层流动及改善个人地位的主要原因是：西方学校教育是社会阶级再制的工具，优势阶级通过“符码权力”进行控制，造成劳工阶级孩子在学校中处于不利位置的事实。为了实现教育符码相对“自主性”，教育系统应在符码控制领域提供及再制批判的资源，当教育再脉络化领域具有某种程度自主性时，其产生的论述能够阻碍官方符码教育论述的支配程度，市民社会的兴起在实现“自主性”方面也值得期待。     

Ethical and legal challenges of mandated child abuse reporters

Background

Mandated reporters inconsistently report child abuse cases. Ethical dilemmas and legal challenges to reporting arise creating barriers to assist abused children and their families.

Purpose

The purpose of this study was to describe professionals' ethical dilemmas and legal challenges to reporting child abuse.

Method

A qualitative study was conducted to explore the ethical and legal challenges of mandated reporters when reporting child abuse. Individual interviews between 60 and 100 min were conducted with a purposive sample of 18 mandated reporters including physicians, nurses, social workers, and teachers. Grounded theory methodology was used to develop categorical themes that reflected mandated reporters' experiences and challenges.

Result

Three themes emerged from the data: conflicts, time, and law as refuge. Professionals described challenges in balancing autonomy, beneficence, nonmaleficence, and justice. There was no best solution to do no harm. The associated stigma and pressure of cultural and secular norms of child abuse inhibit professionals' action based on legal and ethical requirements. The theme of time included limited time and an uncertain future. The law provides security and refuge for professionals to find a solution to the challenges of reporting child abuse.

Conclusion

The ethical and legal challenges of reporting child abuse create complex dilemmas for mandated reporters. Ethical principles are in constant opposition when negotiating rights of children and rights of parents. Supportive structures and education are needed to assist professionals in meeting their reporting obligation and solving their dilemmas.     

ANOVA decomposition of conditional Gaussian processes for sensitivity analysis with dependent inputs

Complex computer codes are widely used in science to model physical systems. Sensitivity analysis aims to measure the contributions of the inputs on the code output variability. An efficient tool to perform such analysis is the variance-based methods which have been recently investigated in the framework of dependent inputs. One of their issue is that they require a large number of runs for the complex simulators. To handle it, a Gaussian process (GP) regression model may be used to approximate the complex code. In this work, we propose to decompose a GP into a high-dimensional representation. This leads to the definition of a variance-based sensitivity measure well tailored for non-independent inputs. We give a methodology to estimate these indices and to quantify their uncertainty. Finally, the approach is illustrated on toy functions and on a river flood model.     

Punctured Woven卷积码的设计与仿真

编织(Woven)码是一类包容性极强的新型纠错码,由于其自身的组合性导致它的编码效率不高、译码延迟大及硬件复杂性高,这些缺点制约了编织卷积码(WCCs)的应用。为了推动WCCs在实际通信系统中的应用,提高其编码效率,该文采用了删余技术,提出将其内外成员码分别进行删余。对删余WCCs在加性的变斯噪声(AWGN)信道上进行了设计与仿真,证实了删余后的外经结构WCCs在相同的码率和相同的外编码器个数情况下有比非删余的WCCs更优的误码率(BER)性能,且大大降低了其编译码的复杂性,提高了其编码效率。     

Elder Abuse and Oral Health Care Providers: An Intervention to Increase Knowledge and Self-Perceived Likelihood to Report

The objective of this study was to ascertain whether a symposium on elder abuse raises the level of knowledge and the self-reported likelihood to report elder abuse among licensed oral health care providers. 130 dentists, hygienists, and assistants voluntarily attended a 4-hour training symposium and completed both pre- and postsurveys testing their level of knowledge. Results by statistical analyses, using repeated measurements, Wilcoxon signed-rank test for nonparametric data, showed increases in awareness of reporting process, knowledge/awareness of elder abuse, knowledge of mandated reporter requirements, and comfort levels with recognizing signs and symptoms of elder abuse and neglect. In conclusion, a symposium can increase the self-reported likelihood of reporting elder abuse.     

符码理论视野中的少数民族教育

英国社会学家伯恩斯坦于20世纪中后期提出符码理论,试图用各种类型的符码来分析阶层文化差异和文化再生产现象。符码理论对于少数民族教育中语言使用问题的研究具有一定的启示意义。民族语言的"局限符码化"和社会阶层之间的"文化错位"能够给这一问题的研究提供一种新的分析框架。     

网络舆情热点事件中二元符码的传播框架分析

文章以网络热点事件议程设置的建构为切入点,从传播内容、传播者和接受者三方面探寻网络议程设置二元对峙的符码.其内容主要表现为弱势群体与公权力的对峙,传播者中草根型的舆论领袖与理性交往的背离,以及集体记忆与现实语境的混响,最终发现当下危机应对策略无法深入到文化内涵层面,“公权力德行”重建才是弥合目前矛盾的关键所在.     

在伪辛几何上构作新的带仲裁认证码

针对具有仲裁的认证码既能防止敌手的欺骗,又能防止收方和发方的互相欺骗的特点,利用伪辛几何构作了一类新的具有仲裁的认证码,并计算其参数.在假定源状态和编码规则都是等概率分布选取时,计算其各种攻击成功的概率.