基于L频段数字航空通信系统1的F-OFDM波形设计

随着航空飞行器种类和数量的激增以及第五代（5G）移动通信系统和物联网（IoT）时代的到来,下一代航空无线通信系统面临着高安全性、大传输容量、低延时、强鲁棒性、高灵活性和综合业务提供等新的挑战。为此,提出了一种基于L频段数字航空通信系统1（L-DACS1）的滤波正交频分复用（F-OFDM）波形设计方法并探讨了可能的技术演进路径。首先引入了认知无线电、非连续载波干涉码OFDM和滤波器的思想,然后针对不同航空飞行器用户动态自适应配置波形参数。仿真结果表明,该方法得到的系统波形具有较低的带外辐射功率、优良的块误码率性能和较高的吞吐量增益。     

X频段信标机的设计与实现

为满足船载X频段测控设备信道相位修正和伺服性能检查的需要,设计并研制了一款X频段信标机。首先,选用HMC765LP6CE芯片,利用频率合成技术设计了信源并通过通用串行总线（USB）实现了发射频率用户自定义;其次,针对安装平台面积小的限制,基于高频结构仿真器(HFSS)设计了高次模微带天线并完成了仿真分析和指标优化;最后,完成了X频段信标机的工程实现并给出了硬件电路结构和软件程序设计方法。经测试,该信标机锁相效果良好,控制简便,性能可靠,满足用户使用要求。     

多层介质频率选择表面的等效电路分析方法

基于数值仿真计算和微波网络理论,提出了一种多层介质中频率选择表面（FSS）等效电路的分析方法。该方法物理过程直观,计算量小,适用于二维任意形状FSS等效电路的精确求解。以方形贴片型FSS为例验证了等效电路模型的准确性,并分析了多层介质对其等效电路参数的影响规律。最后,基于滤波器理论与FSS等效电路模型设计了双层带通型FSS,计算结果表明全波仿真结果与理论计算结果基本一致,为多层FSS的综合设计提供了一种精确设计方法。     

中国农产品内生技术性贸易措施：地位与效应

WTO框架下具有合理性的技术性贸易措施是中国农产品贸易领域实施管理的有效手段。文章利用频数比率对其进行量化研究,认为技术性贸易措施在我国农产品进口管理体系中已替代关税居于主要地位,但相应于地位的变化,其建设尚显滞后,限制效应较差。对此,文章从完善进口安全监管体制,加强标准认证和风险评估,建立进口环节技术性贸易措施分析系统及预警机制等几个方面提出相应建议。     

机制设计视角的O2O模式科学性分析

O2O模式的升级与转型是目前电商行业的热点问题。运用机制设计理论,分析O2O不同经营类型的科学性,验证不同O2O类型与盈利模式间的关系。理论分析发现:相对于独立型与复合型团购,平台型团购能够较好地处理传统营销中买卖双方的信用关系,具有机制设计上的优势性。实证分析显示:平台型团购的盈利模式侧重于新型的增值业务收入,独立型与复合型团购侧重于商品的进销差价等传统盈利模式,消费者投诉绝大部分集中在独立型与复合型团购。     

Do global airline alliances influence the passenger's purchase decision?

This study examines the influences of airline global alliances on the purchase intention of international air passengers in Taiwan. The findings indicate positive relationships between global airline alliances, brand equity, brand preference and purchase intention with a moderation effect of involvement impacting on the relationship between global airline alliances and brand equity, and the relationship between brand preferences and purchase intention. In particular, for highly involved passengers, the effect of global airline alliances on brand equity, and brand preference on purchase intention, is significant.     

政府向NGO购买服务对慈善事业发展的影响

NGO的存在,对以中华慈善总会为主体的官方救助体系形成有利的补充。NGO自身的特质也决定其在为弱势群体提供服务时更便捷、更专业。因此,在NGO行业中引入＂竞争＂的经济学概念,改变原先由政府全方位提供社会救助的模式,形成由政府主导、NGO参与、政府择优购买NGO提供服务这样的自由竞争市场,使得政府由原先＂制定者＂、＂实施者＂逐渐转变为＂主导者＂、＂购买者＂的角色,可以极大地调动NGO的积极性,激活市场动力,并且通过自发的市场调节,形成对有限行政资源配置的最佳效果,同时推动中国的慈善组织蓬勃发展,使社会救助事业取得跨越式进步。     

Involvement theory in constructing bloggers' intention to purchase travel products

Blogs recently have demonstrated their enormous marketing potential, and more and more travel advertisements are being posted in blogs. In light of this observation, this study aims to provide insights into the structural relationship among travel bloggers' involvement level, the advertising effect from blog messages, and travel bloggers' intention to purchase travel products. A travel blogger's purchase intention model was constructed and empirically tested. A total of 900 questionnaires were distributed to identified travel bloggers; 398 valid responses were returned. The data were examined with Structural Equation Modelling (SEM). The results demonstrated the positive impact resulting from the ad effect as well as the ad effect on purchase intention, which could be verified in travel blog environments. It also indicated that high-involvement travel bloggers are more likely to form favourable impressions with regard to ads in travel blogs. Travel blogs play a positive role in the processing of ad messages; brand management is essential to business marketers since brand attitude is the most influential factor related to the ad effect on purchase intention. Meanwhile, while ad attitude is not significantly effective concerning purchase intention, it remains essential in forming brand attitudes. Several implications for posting advertisements in travel blogs will be discussed and suggested in this paper.     

高等师范院校古代汉语教学语料库字频研究

对基于高等师范学校古代汉语教学的语料库相关数据结果做了定量分析,阐述了语料库的用字概况,提出了字区划分的标准,研制了分区字频表。     

Regular Price $299; Pre-order Price $199: Price Promotion for a Pre-ordered Product and the Moderating Role of Temporal Orientation

Retailers typically use the strategy of providing a discount to induce the sale of a new product at a pre-order stage. Despite the prevalence of this strategy, providing discounts might not be effective for all consumers. The present research shows that the positive effect of a discount depends on consumer temporal orientation. Results from four experimental studies reveal that a large discount positively affects present-oriented, but not future-oriented, consumers. The findings suggest that perceived financial risk and perceived product quality sequentially mediate the effect of discount size on value toward the deal and purchase intention. A third-party product quality rating boosts quality perceptions, which in turn reduces perceived financial risk and positively enhances value toward the deal along with purchase intention. Our findings demonstrate that when the brand itself acts as a reliable signal of quality, a discount has its intended effect for both present- and future-oriented consumers. Overall, the findings of this research suggest that a retailer can use quality cues along with a discount, especially for a new brand, to appeal to the broadest group, as it will attract both future- and present-oriented consumers.