新媒体服务系统及其相关支撑技术

从新媒体的概念出发,针对新媒体的对等交互、数字化分布特征,阐述了新媒体服务系统的基本功能和构成要素.然后面向新媒体的需求和发展趋势,重点从新媒体服务系统软件体系架构、新媒体服务组合、数字权益管理、数字水印、信任管理等几个新媒体服务系统关键支撑技术研究的主要内容和热点问题展开了讨论.     

新一代电信系统中业务管理的研究

对新一代电信系统中业务管理机制进行研究。首先,指出了在新型业务开展中传统电信管理模式的不足。其次,分析了新一代电信管理系统中的信息组织形式,并分别从商务视点、商务流程以及商务价值三方面论述了业务管理在未来电信运营中的关键作用。最后,分析了业务管理中关键技术的研究现状,指出新一代业务管理未来的研究方向。     

Interface Energy-Level Management toward Efficient Tin Perovskite Solar Cells with Hole-Transport-Layer-Free Structure

Lead-free tin perovskite solar cells (PSCs) have emerged as a promising candidate toward high-performance and eco-friendly photovoltaic technology with great potential for future application. However, tin PSCs with over 10% efficiency usually feature an organic hole transport layer (HTL) at the illumination side that may induce device degradation during long-term operation. Removing the unstable organic HTL is an important way to solve these stability issues, but the efficiency of HTL-free tin PSCs is still much lower than that of the completed cells. Herein, it is demonstrated that formamidinium tin iodide doped with heterogeneous ammonium salts can form an upward band-bending structure to selectively extract the hole in the HTL-free devices. By using this band-bending structure, a promising efficiency of over 10% is first achieved for the lead-free PSCs with a HTL-free structure. More importantly, the optimized cell is highly stable, keeping 95% and 90% of the initial efficiency after continuous light soaking for 40 days and 80 °C annealing for 300 h, respectively. This work paves a route toward the development of efficient, eco-friendly, and highly stable perovskite photovoltaics.     

How online review environment affects review generation behavior: A competing for attention perspective

From the perspective of competing for attention, this study attempts to examine how a potential reviewer’s review content in terms of topic diversity and topic popularity is affected by the review environment, which is characterized by review volume, review variance, and time distance. The empirical analysis is based on 70,383 restaurant reviews collected from Yelp. The Latent Dirichlet Allocation (LDA) model is adopted to conduct review text mining. Our empirical findings indicate that reviewers are more likely to evaluate the product on a wider range of topics when exposed to a larger volume or lower variance of existing reviews. Our findings also show that reviewers prefer to talk about popular topics as the volume of prior reviews increases or when prior reviews exhibit higher variance, but they tend to discuss unpopular topics when time distance from the first review increases.     

无源唤醒模式的远距离无线收发系统低功耗设计

从电源管理上提出了一种新型节省功耗的方法,根据近距离的passive tag和远距离的有源唤醒收发工作原理,设计了超微功耗无源唤醒的远距离收发系统.     

无线传感器网络能量收集技术分析

对无线传感器网络节点的能量供应及其管理技术的现状进行了讨论。分析研究了无线传感器网络节点的能量收集原理、技术与方法，认为无线传感器网络节点能量管理应从节能与供能两方面去解决。对环境中存在的各种能源的收集原理与方法进行了分析，这些能源包括太阳能、风能、声能、振动、热电以及电磁场能等。最后提出了传感器节点应该采用尽可能多的方法从环境中吸取能量，以确保传感器节点能够长期、稳定、可靠地工作。     

物理探究型元课件的评价设计

文章针对探究型元课件的概念及特点[1],指出探究型元课件评价的功能、类型和标准,给出了探究型元课件的评价指标和效能评价方法.     

计算机技术对人力资源管理模式的作用探究

随着社会科技的不断进步,信息技术也有了突破性的进展。目前,信息技术已经涉及社会的不同领域,广泛应用于各行各业。尤其是对人力资源管理模式的研究产生了重大的影响。本文就对信息技术和人力资源管理的涵义进行阐述,并且介绍了计算机技术对人力资源管理模式的作用,让人们通过计算机技术的应用,更加了解现代人力资源管理的模式。     

基于VPN的电子政务办公系统研发

近年来,政府的组织形态逐渐向多元化方向发展,以往的政务管理方式,已经不能适应当前社会的需求,因此,需要研发完善的电子政务系统,进一步保证政务管理工作的顺利进行。VPN技术是一种新兴网络技术,基于VPN技术研发的电子政务系统,可以让公众参与到政府工作中来。该系统经过需求调研、概要设计、详细设计、系统研发、Testing评审与系统发布6个阶段进行,通过VPN,HTTP等技术的合理设计,从而保证政府决策的安全性和正确性,提高政府管理能力。