数字信息化在高职《中药药剂》教学中的应用

中药药剂学是高职院校中药专业的主要专业课程之一。传统的课堂教学不能满足学生的要求,数字信息化教学手段的应用是对传统教学模式的有效补充,它能提高学生的学习兴趣和积极性,增加课堂知识容量,培养学生自主获取知识的能力。     

Ethical Responses to Public Allegations of Skin Tone Manipulation in Print Advertising: Consumer Indifference or Consumer Concern?

This study examines the effect of consumer prejudice on ethical responses to public allegations of skin tone manipulation in print advertising. A sample of 156 undergraduate business students read a fictitious news story in which an advertising watchdog group accused business executives of using digital manipulation to lighten the skin tone of a Black female model featured in a product print ad. Participants then answered questions on ethical perceptions, behavioral intentions, and prejudice toward Blacks. Results suggest that low-prejudice consumers have stronger ethical concerns toward the digital lightening of ethnic models in print ads than do high-prejudice consumers. The authors discuss the findings, limitations, and directions for future research.     

浅谈数字电视发射机技术的发展

经过近十几年的努力,数字电视地面广播所必需的数字电视发射机技术有了飞速的发展.本文简要介绍了国内外近年在数字电视发射机研制方面的进展,讨论了我国今后几年在数字电视发射机研制方面需要解决的若干技术问题.     

数字电视机顶盒技术及发展趋势

本文以有线数字电视机顶盒为例，介绍了数字电视机顶盒的组成、原理和各种主要技术，分析了以STi5518为核心的机顶盒功能，并对数字电视机顶盒的发展趋势进行了分析预测。     

移动数字电视发展状况分析

移动数字电视是数字电视的一种新兴传播形式,目前公众对信息接受的随时性需要越来越强。移动数字电视的推广以国内三家民营运营商为主。高画质、多频道、随时接收、发展潜力巨大是移动电视最大的优势特点。同时仍存在技术不完善、收视环境及受众心理效果不理想等制约瓶颈。     

基于参数选择的数字预失真处理

数字预失真系统中，高精度预失真通常需求高阶多项式，而高阶多项式会导致预失真计算量的急剧上升。针对记忆多项式级数与预失真精度的矛盾，提出了一种基于参数选择的数字预失真结构，使用低阶多项式实现了对复杂度高的功率放大器高精度预失真处理，同时避免了计算量的上升。基于一组功率放大器的实测数据进行仿真，验证了参数选择方法相比于传统方法在同计算量的条件下精度的提升；并以正交频分复用信号作为输入信号进行仿真，得到了21 dB的邻近信道功率比抑制效果，相比于传统方法有6 dB的提升。     

Negative customer engagement behaviour: the interplay of intensity and valence in online networks

ABSTRACT

Recent marketing and service research highlights the detrimental impact of negative customer engagement behaviour (CEB) in online social networks. Nevertheless, the extant literature captures the impact of what customers say about service providers in their negative reviews and fails to provide any understanding of different intensity levels of negative engagement. This article marks the first attempt to provide a more nuanced view of negative CEB by investigating the impact of six forms of negatively valenced influencing behaviour (NVIB) using two online experiments. Our results provide new insights into intensity levels of NVIB and how they are moderated by positive reviews. Practically, this paper addresses one of the challenges for service providers in managing NVIBs, centred on understanding the heterogeneity of its forms. The results suggest that managers use semantic tools to detect the intensity levels of NVIB and to prioritise handling and/or mitigating the more intense NVIBs when they occur.     

The effect of duration metrics on consumer satisfaction

Consumers increasingly feel that time is scarce. To guide time expectations, many marketers have begun communicating duration metrics—information about how long most consumers typically spend on a given activity. Despite the rising prevalence of duration metrics, little is known about how they shape consumption experiences. Five experiments and an analysis of digital engagement data from articles on a popular online publishing platform show that longer (vs. shorter) duration metrics enhance satisfaction and word-of-mouth after an activity is completed. Subjective time perceptions underlie these effects, such that longer duration metrics make consumers feel like they have spent more time on a given activity, and consumers infer their ex-post satisfaction from the amount of time they feel they have invested. Thus, this research provides insight into how duration metrics operate and challenges the intuition that consumers prefer activities that demand less of their time.     

数字经济对产业结构升级的影响及空间效应

数字经济不仅是经济增长的新动能，也是产业结构升级的新引擎。基于2011—2020年30个省份的数据，从产业结构高级化、合理化的双重视角出发，使用熵值法测度各省数字经济发展水平，并从基准回归-中介效应-空间效应3个模块围绕数字经济对产业结构升级的影响展开研究。结果表明：数字经济促进产业结构升级；居民消费扩容在两者促进机制中起到部分中介作用；数字经济对产业结构高级化具有正向空间溢出效应，而对产业结构合理化的空间溢出效应还未体现。     

单频信号快速频率估计算法比较及改进

本文首先讨论并分析了各种插值DFT(离散傅里叶变换)算法,然后提出了一种实正弦信号的快速插值频率估计方法。该方法只需 3个DFT变换系数的实部构造频率修正项,计算量低,具有精度高、测频速率快的特点。计算机模拟和FPGA仿真均证实了该方法的有效性。