The study of youth online: a critical review and agenda

The increasing and pervasive use of online technologies, especially social media, has inspired scholars to investigate how the Internet influences communication. As young people represent the fastest growing adopters of new online technology, much of this research targets youth activity online. But how is the communication discipline taking up this issue, broadly? Typically left to new media and computer-mediated communication scholars, we argue youth online activity raises new and exciting possibilities for researchers across the communication discipline. In this paper, we present a qualitative content analysis of communication research about youth and the Internet. Our analysis of over 700 journal articles provides a clear picture of past and present trends in communication research of youth online activity. Furthermore, we discuss the top four content themes, including: uses and gratifications, engagement, identity, and the uniqueness of youth experience. Critically, we articulate how such research organizes and positions youth in meaningful ways, paving the way for issues of inclusion. We call for a shift from a “difference” framework to one that more explicitly considers “complexity” before suggesting opportunities for future research that crosses and unites subdisciplinary boundaries.     

Web前端开发技术在在线学习平台中的研究与应用

文章着眼于Web前端开发技术特点,基于在线学习平台的运转、使用实际,转变技术应用思路,创新技术应用方法,推动We b前端开发技术的合理化使用,打造成熟的桌面端、移动端学习平台,促进在线学习平台功能的完善与丰富.     

Enabling multiparty karaoke over Internet based on low‐level computers: practice and experiment

Karaoke is a system for amateur singing. The traditional online karaoke system does not allow multi‐singers to sing a song in one session. This study designs and implements multiparty karaoke over Internet (MKI) based on low‐level computers. The MKI is an online karaoke system of distributed architecture that allows multi‐singers to sing a song in one session. The MKI must deal with the problems of feedback, asynchronous audio latency at singers’ nodes, round‐trip latency at an inviter's node, and multi‐singers singing a song in one session. The acoustic isolation between microphone and speakers avoids feedback. Network Time Protocol avoids asynchronous audio latency. The third method's round‐trip latency in this study is within 86 ms, and all participants experience the simultaneous singing of the inviter and the invitees. MKI can be used for increasing leisure time, singing skills, and interpersonal relationships. Copyright © 2011 John Wiley & Sons, Ltd.     

10kV配电变压器状态评估模型研究

本文针对10kV配电变压器状态评估模型进行了介绍,叙述了变压器状态评级、评估指标体系的建立、评估模型的建立和实例计算等思路和方法。鉴于检修体制是否合理完善直接影响配电变压器可靠性水平,通过基于风险度计算的状态评估模型,对配电变压器进行状态评价,对变压器的合理使用和维修、故障预测以及配电管理等有着极为重要的意义。     

基于问题导向的在线教学研究

本文以“电力电子技术基础”的在线教学为例,开展以学生为中心的基于问题导向的教学方法优化实践。教学过程中,结合学校教师教学发展中心组织的EMI教师培训,对教学计划、教学重点进行了大力度的改进;同时,结合过程中与学生的交互、期末学生的反馈以及同行专家的建议,对本次的优化改进进行了教学分析、分析、反思和总结,以期不断提升本课程的教学质量,并为其它工科类课程的教学优化提供借鉴。     

Network traffic prediction based on a new time series model

Fast and accurate methods for predicting traffic properties and trend are essential for dynamic network resource management and congestion control. With the aim of performing online and feasible prediction of network traffic, this paper proposes a novel time series model, named adaptive autoregressive (AAR). This model is built upon an adaptive memory‐shortening technique and an adaptive‐order selection method originally developed by this study. Compared to the conventional one‐step ahead prediction using traditional Box–Jenkins time series models (e.g. AR, MA, ARMA, ARIMA and ARFIMA), performance results obtained from actual Internet traffic traces have demonstrated that the proposed AAR model is able to support online prediction of dynamic network traffic with reasonable accuracy and relatively low computation complexity. Copyright © 2005 John Wiley & Sons, Ltd.     

一种新型的在线计费系统的研究和设计

本文提出了预付费和后付费有机融合的新型在线计费系统,主要介绍了系统的总体框架结构和系统流程和在线计费系统的特点。     

无线LoRa在全业务泛在电力物联网终端层的应用

国家电网公司提出的“全业务泛在电力物联网”是能源网和物联网的融合演进,是服务于广大用户的关键能源基础设施。随着电力物联网的战略兴起,输电线路在线监测采集节点和监测规模将骤增,采用何种技术体制建设现场通信网络,兼顾考虑长距离、低功耗、高可靠等多重因素至关重要。对无线LoRa技术特点及优势进行了研究,结合输电线路在线监测的应用场景及需求,提出基于无线LoRa的输电线路在线监测组网方案并对其进行了适应性分析,研究成果在该领域具有一定参考意义。     

改进型ZigBee协议在避雷器在线监测系统中的应用研究

本文介绍了一种金属氧化物避雷器(MOA)在线监测系统硬件结构,包括MOA检测终端、电压汇集采样装置和同步通信控制器.在此基础上设计了基于ZigBee无线通信协议的避雷器监测系统.采用星型网络结构,以同步通信控制器为协调器,以MOA检测终端、电压汇集装置为终端节点,详细分析了协调器和节点的工作流程和组网方式.     

数据仓库技术在电信管理网中的应用

数据仓库技术是近几年迅速发展起来的一种技术。国际上许多电信运营企业都积极关注于数据仓库技术在电信运营部门和网络操作中的应用。笔者对数据仓库技术在电信管理网（ＴＭＮ）中的应用作了一些探讨,并提出了一种具体的应用方案。