基于多级异构网络的无线传感器网络高效分簇路由算法

在较大规模的无线传感器网络周期性数据采集应用中,经常会出现异构网络, LEACH等协议没有考虑节点的异质性。提出一种基于多级异构网络的高效路由分簇协议,考虑了节点的异质性,为不同类型节点设置不同簇头选举概率及阈值函数,优化簇头选举策略,较高初始能量和剩余能量的节点比低能量节点拥有更多的机会成为簇头节点。实验结果表明,能够高效地利用传感器网络采集数据,网络负载总体均衡,并延长网络生存周期。     

WSN中基于贪婪算法的能量有效路由策略

近年来随着微电子技术、传感器技术及通信技术的发展,无线传感器网络技术得到迅猛发展.文章把节点的剩余能量考虑到贪婪路由选择算法中,提出了一种基于贪婪算法的能量有效路由策略(Greedy Forwarding Based Energy EfficientRouting Strategy,GFEER).仿真实验结果表明该策略...     

无线充电技术在无线传感器网络中的应用现状

在无线传感器网络的应用中普遍存在一个急需解决的问题———整个网络的能量限制问题。目前能量管理研究侧重于节能方向,但随着无线充电技术取得突破性进展,现已可从主动能量供应方面来对无线传感器网络进行能量管理。文章首先介绍了无线传感器网络的能量短缺问题以及无线电力传输技术的基本原理、方法、优缺点和发展状况,进而阐述了在无线传感器网络中运用无线电力传输技术的方法、进展和存在问题,并对无线充电技术的下一步研究重点做出了展望。     

强竞争型多目标跟踪任务分配策略研究

基于无线传感器网络的3个目标以上跟踪在任务分配阶段出现强竞争冲突问题,综合考虑网络能耗、可靠性函数以及节点剩余能量均衡度方面的性能,引入基于综合目标函数的竞争型弹性神经网络算法,以综合目标函数为依据调整神经元的动态接受域,并采用基于信息熵的逼近理想解技术对综合目标函数的多指标进行客观评价。仿真实验表明,此文的任务分配策略一定程度上提高了网络的可靠性,延长了网络寿命。     

基于核主成分降维的RBF网络降水预测

针对径向基函数神经网络（RBF网络）的隐层节点数、中心和宽度难以确定的问题,为提高网络性能,首先采用模糊聚类分析法对样本数据进行初始聚类,以初始分类间的最小距离作为初始宽度;然后引入正交最小二乘法训练出新的数据中心、个数及权值,修改宽度为当前数据中心间的最小距离;最后采用梯度下降法训练并调整中心、宽度及权值;几种算法进行的组合优化改进,使网络泛化性能更优.由于降水影响因子众多,采用了核主成分分析法（KPCA）对样本数据进行特征提取降维预处理.对广西5月3区的日降水量使用上述模型进行预报实验,结果表明,该模型具有较好的泛化性能,预报准确率高于T213降水预报模式,具有一定的推广价值.     

WSNs中SMAC协议占空比动态调整研究与实现

WSN网络负载具有周期性和突发性,SMAC协议因固定占空比导致网络时延和能量浪费严重.为此,建立时延和能耗模型,提出从传感器节点缓存区队列长度和其增长速率与信道带宽比值两方面判断网络负载情况,据此动态调整SMAC中的占空比,并改进SYNC帧格式和同步分组广播方法.通过NS2仿真实验表明:相对原SMAC协议,改进的协议网络时延更平稳、时延更小,特别在网络负载较重时时延小得多;在能量效率方面,单位焦耳能量能传送的数据量比SMAC多28%.     

人工智能技术在计算机网络技术中的应用研究

针对计算机网络耗能不均的问题,引入人工智能技术理论,在能量均衡计算机网络分析的基础上,将人工智能技术应用到计算机网络能量均衡研究之中.通过实验表明:通过该方法使得计算机网络节点之间能够进行更好的协作,使得计算机网络的生命周期实现了最大化.     

基于能量分块均衡算法的网络多基站路由能耗调整

针对现有方法处理下网络生命周期较短、路由能耗速率较大以及数据包接收量较低的问题,提出基于能量分块均衡算法的网络多基站路由能耗调整方法.将EEUC路由协议与多基站下路由管理DSP设计相结合,使簇头能够承担更多数据传输任务.通过统计分析特征提取结果结合线性预测方法实现对路由能耗的准确预测,得到网络多基站路由能耗数据过载的概率密度函数.根据预测结果输出能量消耗数据,依据能量分块均衡算法,通过均衡簇头能耗实现对网络多基站路由能耗的均衡.实验结果表明,该方法有效减缓了路由能耗速率,提高了网络生命周期与数据包接收量,使能量得到了充分利用.     

从庞德“语言能量”观角度剖析网络词汇的生成及其翻译

庞德的"语言能量"观认为语言是具有"能量"的,词语互组激发自身能量,从而呈现新的解法与意义。网络词汇是一种在网络背景或条件下形成的语言变格,生成于词语自身"能量"持续的运动与发展。从"语言能量"观出发来窥察词汇能量的变化,分析网络词汇生成及翻译,能帮助我们更好地领悟现代人的认知及心理。同时,译者应展现翻译过程中的主体能动,准确"输出"网络词汇的内在蕴意。     

基于职业能力的中职计算机网络技术专业课程改革探索与实践

本文主要分析计算机网络技术职业岗位需求,调整中职计算机网络技术专业人才培养的目标,优化计算机网络技术专业课程体系,改革教学内容的探索与实践。     

浅谈高速无砟道岔静态精调技术

高速无砟道岔精调技术要求标准高,与传统道岔精调不同,高速无砟道岔要采取新工艺,静态初调、精调固定,动态检测调整等工序。无砟道岔精调尤为重要,它是决定乘车舒适度的主要因素。     

变频调速工艺在电厂输煤系统的应用

就如何改善异步电动机的调速性能进行论述,并简要说明变频调速工艺在电厂输煤系统中的应用。     

Emotional support and adjustment over a year's time following sexual abuse discovery

OBJECTIVE: This study investigated age and gender differences in perceived emotional support in children and adolescents who experienced sexual abuse from the time of discovery to 1 year later. Also examined were the relations among sources of support and adjustment and whether support explained resilience, defined as better adjustment over a year's time. METHOD: One hundred and forty-seven sexually abused youth were interviewed at the time of discovery (T1) and 1 year later (T2). Information gathered included severity of the sexual abuse, satisfaction with support from caregivers, same-sex and other-sex friends, feelings of shame about the abuse, and attributional style. Youth adjustment was measured using reports from the youth themselves, caregivers, and teachers. RESULTS: Children reported the most satisfaction with support from caregivers followed by friends whereas adolescents reported similar levels of support from friends and caregivers. Satisfaction with support was differentially related to adjustment. Youth who reported more satisfaction with caregiver support at T1, reported less depression, better self-esteem but more sexual anxiety 1 year later. More satisfaction with support from friends predicted lower self-esteem but less sexual anxiety. More satisfaction with initial caregiver support at T1 predicted better parent- and teacher-rated adjustment 1 year later, after controlling for initial adjustment. CONCLUSIONS: In general, initial caregiver emotional support at the time of abuse discovery predicted resilience in child and adolescent victims of sexual abuse. Findings suggested that treatment should include a focus on helping caregivers provide appropriate emotional support.     

“新经济”及其对我我国产业结构调整的启示

产业结构调整是保持国民经济持续、快速、健康发展的重要方面,也是党在《十五计划建议》中提出的主要任务。近年来发端于美国的“新经济”,为我们提供了有益的启示。对此,我们既要大力支持高新技术的研究与开发,保证高新技术产业的先导作用;又要以高新技术改造传统产业,促进传统产业的成熟发展;还要发挥市场机制的作用,以制度创新带动产业结构调整。     

高校图书馆图书调整及排架方法初探

随着高校规模的不断扩大,各高校的图书馆藏书规模不断扩大。本文从工作实际出发,提出有关图书馆的布局调整与藏书的排架、倒架、架位预留的方法,并论述了RFID新技术在图书馆的应用。     

Effects of mother-son incest and positive perceptions of sexual abuse experiences on the psychosocial adjustment of clinic-referred men

OBJECTIVE: The primary objective was to examine the long-term impact of mother-son incest and positive initial perceptions of sexual abuse experiences on adult male psychosocial functioning. METHOD: Sixty-seven clinic-referred men with a history of sexual abuse participated. The participants completed self-report measures regarding their current psychosocial functioning and described the nature of their sexual and physical abuse experiences during childhood. RESULTS: Seventeen men reported mother-son incest, and these men endorsed more trauma symptoms than did other sexually abused men, even after controlling for a history of multiple perpetrators and physical abuse. Mother-son incest was likely to be subtle, involving behaviors that may be difficult to distinguish from normal caregiving (e.g., genital touching), despite the potentially serious long-term consequences. Twenty-seven men recalled positive or mixed initial perceptions of the abuse, including about half of the men who had been abused by their mothers. These men reported more adjustment problems than did men who recalled purely negative initial perceptions. CONCLUSIONS: Mother-son incest and positive initial perceptions of sexual abuse experiences both appear to be risk factors for more severe psychosocial adjustment problems among clinic-referred men.     

Psychological Benefits of Participation in Three-dimensional Virtual Worlds for Individuals with Real-world Disabilities

One hundred and ninety-six individuals with real-world disabilities were administered a battery of psychological adjustment measures soon after joining the three-dimensional virtual world of Second Life^®. After three months, 61 participants who continued to be actively involved in Second Life were re-administered the adjustment measures and completed a survey about their virtual and real-life experiences during the interval between assessments. Participants’ scores significantly improved on measures of affective states (depression, anxiety, positive emotion, life satisfaction, and feelings of loneliness) and self-evaluation (self-esteem). An index of overall change was associated with the number of virtual friends and group affiliations in Second Life, as well as feelings about the self as a result of involvement in the virtual world. The current study provides initial empirical support that three-dimensional virtual worlds can serve as a psychologically beneficial context for individuals with real-life disabilities.     

Children's Academic and Behavioral Adjustment as a Function of the Chronicity and Proximity of Peer Rejection

The experience of peer rejection is associated with a number of concurrent and later problems for children. However, we know very little about differences in risk relative to different experiences of rejection over time. This study examined later academic and behavioral problems as a function of two dimensions by which rejection may vary over time: chronicity and temporal proximity. 622 second- through fourth-grade children (ages 7–12) were tested in the spring of 4 consecutive years. The results indicated that both chronicity and proximity directly influenced later adjustment. Taken together, the findings suggest that all levels of rejection were associated with greater absenteeism from school, and more chronic and proximal experiences of rejection were associated with elevated externalizing behavior problems and teacher-rated internalizing behavior problems. There was evidence that initial level of adjustment, gender, and development moderated the relation among these dimensions of rejection and later adjustment.     

论信息化对我国产业结构的优化

调整和优化产业结构是十五期间经济发展的主线。本文认为，世纪之交国际国内经济的重大变化，决定了运用信息化优化产业结构具有客观必要性。信息技术、信息产业所具有的高渗透性、生长性，决定了它对产业结构调整、升级有着不可替代的作用。并提出了加快信息化、优化产业结构的对策建议。     

Literacy Achievement during Kindergarten: Examining Key Contributors in an At-Risk Sample

This study investigated the contributions of initial literacy, oral language, and social adjustment to literacy achievement at the end of the kindergarten year. Data were collected across the kindergarten year from 48 children attending a school serving primarily children from low-income households with researchbased curriculum and intervention programs. Data were used to create latent variables to represent initial literacy, oral language, and social adjustment as predictor variables and a variable representing word reading and spelling as an outcome variable. Multiple regression indicated that only initial literacy contributed significantly to the outcome. Path analysis also indicated the significance of initial literacy while supporting the shared contribution of oral language to the literacy outcome. Discriminant function analysis indicated that individuals with higher scores on the literacy outcome had high factor loadings on both initial literacy and oral language. Social adjustment did not contribute significant variance to the literacy outcome in any of the analyses. This study has implications for both policy and practice, documenting the importance of initial literacy skills, even from the beginning of kindergarten, to kindergarten literacy outcome and highlighting the correlation between the effects of initial literacy and oral language on reading and spelling.