Rethinking the circuit of culture: How participatory culture has transformed cross-cultural communication

This paper explores the influence of digital communication ? and in particular social media ? on cross-cultural communication, based on the Circuit of Culture model. Scholarly literature supports the notion that social media has changed the speed at which we communicate, as well as removed traditional (geographical) boundaries around cross-cultural campaigns. Since the introduction of digital media, the role of the public relations practitioner has become more strategic in order to maintain relevance with even more diverse ? and dispersed ? audiences. Large scale campaigns, like the Human Rights Campaign to support Lesbian, Gay, Bisexual, and Transgender (LGBT) rights, have seen messages spread far beyond the country of origin, and with that, demonstrate the ability to affect advocacy campaigns in other countries. The authors argue that instead of acting as cultural intermediaries, public relations practitioners must become cultural curators, with the skills to create meaning from audiences, who are now content creators in their own rights, and encourage a true participatory environment that sees cultural values shared as part of an organic exchange process.     

Starbucks is forbidden in the Forbidden City: Blog, circuit of culture and informal public relations campaign in China

This study offers an in-depth analysis on the closedown of a Starbucks café inside the Forbidden City, one of the most recognized historic sites in Beijing, China, under the pressure of a Web-based activist campaign. Adopting the circuit of culture model, this study illustrates the intricate role of culture in international public relations within an Internet-based media context, as well as the tension surrounding the conflicting identities between Starbucks’ global presence and the local sensitivity attached to the cultural heritage—the Forbidden City. This study also highlights the role of new media (e.g., blogs) in China and its impact on international public relations practice.     

基于软开关技术的斩波电路仿真

本文介绍了软开关变换相对于传统电路中硬开关变换的优点,对几种典型的软开关进行了叙述和比较,并给出了其中两个有代表性变换电路的multisim仿真结果,最后提出了软开关技术的发展趋势。     

浅谈电路实验教学模式的改革

电路实验是电路教学中一个非常重要的实践环节,针对传统实验教学教学方法单一、学生缺乏主动性和创造性等问题,对电路实验教学模式的改革进行了分析,达到培养高素质应用型人才的目的。     

“电路分析基础”课程教学改革与实践

文章针对"电路分析基础"课程的主要特点,从教学思想、教学环节、教学手段等方面论述了对"电路分析基础"课程改革的基本做法.通过多媒体与板书结合、分小班上习题课、增加期中考试的方法来改进教学手段,提高学生分析问题、解决问题和创造性思维的能力.同时通过建立课程教学网站,加强教师和学生之间的交流,促进学生增强学习的自主意识.     

仿蔡氏电路中的分叉和混沌边界值——电路中黄金数的出现

本文根据Routh—Hurwitz判据,分析了仿蔡氏电路中分叉参数G和C_1的变化对其稳定区域的影响,并且导出了该电路不稳定现象消失时,电路参数须满足的条件α(?)C_2/C_1<(5 1/2-1)/2(G分叉)和β(?)C_2/LG~2<3-2 1/2(C_1分叉),从而避免了该电路中不稳定因素(包括混沌这种故障在内),达到确定故障边界的目的。另外,稳定条件的边界值α′=(5 1/2-1)/2恰好是黄金数。     

二阶串联谐振电路通频带的简捷测量、计算方法

在中频范围内,二阶串联谐振电路通频带的常规测、算方法是利用LC串联电路频率特性曲线,描点测△f=f2-f1,或者由给定电路参数,建立二阶方程,算出f2和f1,求△f,测量和计算都相当麻烦。本文从通频带定义出发,导出了测量和计算通频带的简捷公式,即△f=f_0/Q，和△f=R/2πL。用前式测量,后式直接代参数计算,非常简便。且简捷方法与常规方法比较表明,前者测量误差小于后者。     

A nonlinear optimization methodology for VLSI fixed-outline floorplanning

Floorplanning is a critical step in the physical design of VLSI circuits. The floorplanning optimization problem can be formulated as a global optimization problem minimizing wire length, with the area of each rectangular module fixed while the module’s height and width are allowed to vary subject to aspect ratio constraints. While classical floorplanning seeks to simultaneously minimize the wire length and the area of the floorplan without being constrained by a fixed outline for the floorplan, state-of-the-art technologies such as System-On-Chip require the solution of fixed-outline floorplanning. Fixing the outline of the floorplan makes the problem significantly more difficult. In this paper, we propose a two-stage nonlinear-optimization-based methodology specifically designed to perform fixed-outline floorplanning by minimizing wire length while simultaneously enforcing aspect ratio constraints on soft modules and handling a zero deadspace situation. In the first stage, a convex optimization globally minimizes an approximate measure of wire length. Using the solution of the first stage as a starting point, the second stage minimizes the wire length by sizing the modules subject to the prescribed aspect ratios, and ensuring no overlap. Computational results on standard benchmarks demonstrate that the model is competitive with other floorplanning approaches in the literature. Research supported by a Postgraduate Award, Discovery Grants 312125 and 15296, and RTI Grant 314668 from the Natural Sciences and Engineering Research Council of Canada, by an Ontario Graduate Scholarship, and by a MITACS grant.     

Job sequencing and component set-up on a surface mount placement machine

In this paper, the problem of sequencing PCB assembly jobs on an automatic SMD placement machine is addressed. The objective is to minimize the makespan. Moreover, both the job arrival times and the precedence constraints for those jobs requiring component placement on the primary and secondary side of the same board must be taken into account. A considerable set-up time occurs when switching from one board type to another, which depends on the number of component feeders to be replaced in the magazine of the assembly machine. The exchange of component feeders is complicated by the fact that each feeder occupies a different number of magazine positions. Theoretically, the minimum makespan required for a given batch of jobs could be derived by solving the order sequencing and the component set-up problems simultaneously. However, optimal solutions are practically unattainable for problems of realistic size. Therefore, efficient heuristic solution procedures are developed which exploit component commonality between PCB types. The numerical results obtained indicate the practicality of the proposed heuristics in an industrial application.