基于多维频谱地图的干扰规避

针对复杂电磁环境下卫星移动通信系统可靠通信需求,利用频谱地图多维数据呈现优势,提出了基于多维频谱地图的干扰规避方法。通过建立卫星移动通信系统波束、时隙、子频带、干扰强度等多维信息关联的频谱地图,利用数据挖掘方法对频谱可用情况进行预测,基于预测结果及用户QoS(Quality of Service)需求生成干扰规避策略,通过星地联合频谱资源调配实现系统干扰规避。该方法为卫星移动通信系统干扰规避提供了一种全新的思路,可提升卫星移动通信系统干扰防护能力。     

视频业务识别方法综述

视频用户体验的质量要求给网络传输带来了巨大挑战,未来的虚拟现实/增强现实(Virtual Reality/Augmented Reality,VR/AR) 视频业务则对交互时延提出了更高要求。视频业务识别是网络运营商及视频业务提供商对视频进行优先网络资源分配和自适应速率控制的基本前提。综述了业务识别领域的一般研究方法及其对视频业务的具体应用。首先,总结了每种业务识别方法的工作原理,对比了这些方法应用于视频业务时的优缺点及在准确率和召回率指标上的识别性能;然后,特别介绍了可以提升识别准确率和计算性能的特征选择算法;最后,阐述并分析了高吞吐量网络分类速度不够、无成熟视频业务识别平台和样本分布不均衡等视频业务识别面临的挑战,并针对现有业务识别方法存在的问题,给出了引入移动边缘计算、基于端口的方法串联其他识别方法等可能的解决方案。     

A critical appraisal of the reporting quality of published randomized controlled trials in the fall injuries

To evaluate the quality of reporting in published randomized controlled trials (RTCs) in the field of fall injuries. The 188 RTCs published between 2001 and 2011, indexed in EMBASE and Medline databases were extracted through searching by appropriate keywords and EMTree classification terms. The evaluation trustworthiness was assured through parallel evaluations of two experts in epidemiology and biostatistics. About 40%–75% of papers had problems in reporting random allocation method, allocation concealment, random allocation implementation, blinding and similarity among groups, intention to treat and balancing benefits and harms. Moreover, at least 10% of papers inappropriately/not reported the design, protocol violations, sample size justification, subgroup/adjusted analyses, presenting flow diagram, drop outs, recruitment time, baseline data, suitable effect size on outcome, ancillary analyses, limitations and generalizability. Considering the shortcomings found and due to the importance of the RCTs for fall injury prevention programmes, their reporting quality should be improved.     

Target‐Setting,Pay for Performance,and Quality Improvement: A Case Study of Ontario Hospitals’ Quality‐Improvement Plans

This study examines whether difficult targets and quality indicators in executives' pay‐for‐performance (P4P) plans affect performance. The impact of target‐setting and P4P plans on quality improvement in the public sector is unclear. The Ontario government initiated the Quality Improvement Plan (QIP), which requires hospitals to set targets for quality indicators annually and link executive pay to target achievement since 2011. Analyzing Health Quality Ontario's database and hospitals' 2012–2013 QIPs, this study shows greater quality improvement in hospitals with difficult targets than hospitals with easy targets or without assigned targets; however, the positive impact disappears for high‐performance hospitals relative to their peers. We find no significant effect of the use of quality indicators in executives' P4P plans on quality improvement. Copyright © 2018 ASAC. Published by John Wiley & Sons, Ltd.     

浅析高校教师如何提高教学质量

作为一名从事高校教学工作的教师,教学质量是一个教学者的生命线。为此,在教学方面教师应重视提升自己的教学质量,树立良好的口碑。提高教学质量是每个教师都要重视的问题。本文从高校教师的角度出发分析了如何提高教学质量。     

全固态PDM发射机的运行，维护与故障处理

近几年来,全固态中波发射机逐步取代了真空电子管发射机成为主流,大大地节省了发射台的日常运行费用和能源消耗,提高了安全播出质量,降低了停播率,减轻了机房工作人员的劳动强度。本文就是针对全固态中波广播发射机的使用与维护及日常运行环境进行粗浅的介绍。     

Emotional labor in a non-isolated service encounter - The impact of customer observation on perceived authenticity and perceived fairness

Emotional labor is a frequently discussed topic in the service literature because of its varying effects on customers' evaluation processes. Previous research has primarily investigated the effects of emotional labor from an employee-customer perspective. This article considers customer copresence and argues that the observed interaction between an employee and another customer affects the focal customer's evaluation process. An extended customer-employee-customer model is presented and empirically tested in a pharmacy setting. The findings show that distinctive emotional labor affects customers' perceptions of authenticity and fairness. This study presents a more nuanced account of the effectiveness of emotional labor and provides managers with advice to enhance point-of-sale interactions.     

Impact of customers' assessment of website attributes on e-relationship in the securities brokerage industry: A multichannel perspective

The paper focuses on the comparison between pure e-retailers and multichannel retailers' customers and how they differ in their evaluations of functional and relational attributes of the website, as well as how these attributes impact online relationships. An online survey among online securities investors was conducted. Subjects were self-selected from blogs and forums dedicated to personal finance. A total of 326 questionnaires formed the final sample of this study. By using a series of univariate analyses of variance, structural equation modeling, and multi-group analysis, this research empirically demonstrates that the e-service quality evaluation and determinants of online relationship are different in multichannel contexts versus pure online ones. Results show that customers of multichannel retailers are not more loyal than those of pure online retailers. However, multichannel retailers exceed pure online retailers at achieving a higher level of online trust and a higher assessment of website features. The paper concludes with managerial implications that may be useful in multichannel retailing.     

Is brand alliance always beneficial to firms?

In this research, we develop a fresh analytical model to examine the impact of brand quality on the firms’ performances when two firms selling substitute products form a brand alliance. Our results indicate that when two products have equal brand qualities, brand alliance is always a beneficial strategy for two firms to employ. However, when two products have different brand qualities, brand quality differential shows a positive relationship with the profit of the firm with the low-quality brand but demonstrates a negative relationship with the profit of the firm with the high-quality brand in the brand alliance. Our results also show that brand quality differential has a greater effect on the profit of the firm with the high-quality brand than on that of the firm with the low-quality brand. In addition, we find that brand alliance becomes much more valuable to the firm with the high-quality brand when the brand quality differential decreases, but the value of brand alliance has a concave relationship with the profit of the firm with the low-quality brand when the brand quality differential increases.     

An asymmetrical approach to understanding configurations of customer loyalty in the airline industry

This study employs fuzzy set qualitative comparative analysis (fsQCA) to examine asymmetrical relationships among service attributes, relationship quality, and customer loyalty in the airline industry. The study incorporates customers’ demographics and psychological variables to model customer loyalty. Customer loyalty is operationalised as behavioural and attitudinal dimensions in order to capture customers’ actual behaviours and behavioural intentions. Symmetrical testing is also used to compare findings with those from fsQCA application. The study provides various causal recipes or configurations for predicting relationship quality and customer loyalty. The comparison between symmetrical and asymmetrical findings presents deeper and more insightful information. These findings provide useful guidelines and references for the relevant researchers and practitioners. The study also contributes to the literature by utilising symmetrical and asymmetrical tools to advance understanding of antecedent conditions of relationship quality and customer loyalty.