涨跌停限制磁性效应加速特征研究——基于中国A股市场高频交易数据挖掘

本文选取中国A股市场1003只股票作为研究对象,运用二次函数模型,通过对考察期内高频数据的挖掘,从收益率和交易量两个层面,分析股票涨跌停前30分钟磁性效应的加速度、加速拐点和加速持续期三个特征。研究发现,收益率和交易量涨跌停前的磁性加速现象显著存在;犬盘股涨停前收益率的加速度与跌停前加速度对称,小盘股收益率涨停前加速度大于跌停前加速度,并且两加速度均大于大盘股;上午涨跌停收益率磁性加速度大于下午涨跌停;上涨过程交易量磁性加速度大于下跌过程;收益率的拐点和加速持续期在同一过程中与交易量的拐点和加速持续期基本一致。     

基于超低功耗单片机控制的物流运输状态检测系统的设计

为了解决精密仪器或易碎货物在运输过程中发生跌落冲击造成损伤或破碎以及由于包装不合理等原因导致对外界敏感仪器损坏的问题,设计了基于超低功耗单片机MSP430为核心的物流安全记录仪对整个运输过程进行实时监控。该系统利用美国ADI公司生产的三轴加速度传感器对运输过程中冲击事件进行实时采集捕获,采用瑞士SENSIRION公司生产的温湿度传感器对当前货物外部环境进行检测。     

The Role of Accountants in Decision-Making in Lebanese Firms

The issue of accountants＇ role in decision-making has been the center of attention of lots of studies in the last decade but never did it get the adequate coverage in Lebanon. This paper studies to what extent accountants are involved in the managerial decision-making in Lebanon. Two hundred experienced accountants from all over the country were randomly selected for a questionnaire survey. This survey provides evidence as to what factors contribute to the variance of influence accountants have in managerial decision-making. The results from the questionnaires varied, but we conclude that accountants＇ involvement in new product development （NPD）, the skills that accountants have, their role in the financial analysis of the firm, and how much the finn they work for encourages them to advice on business decisions affect the degree of contribution an accountant has to decision-making. The findings of this research could be used as a reference to help in understanding the role of accounting in Lebanon by various finns and organizations.     

A new millennium and a new Journal for Injury Control and Safety Promotion

Youth violence continues to be a serious and too prevalent problem in the United States. There is increasingly compelling evidence that the exceptionally high levels of mortality are linked to access to guns by youth. There is also evidence that youth violence occurs in multiple forms and that these differing forms call for different prevention strategies. Some youth violence is situational, some is best understood within its relationship context, some occurs as part of a predatory criminal activity, and some seems to be the result of serious psychopathology. This paper provides a review of the current understanding of the epidemiology of youth violence in the United States, applies a developmental-ecological perspective to risk, reviews the empirical support for differing prevention approaches, and suggests practice, research, and policy implications of this knowledge base.     

复杂轨迹合成孔径雷达后向投影算法图像流GPU成像

相对于基于傅里叶变换的频域成像算法,后向投影(BP)算法因采用时域逐点相干积累,更适合于复杂轨迹合成孔径雷达(SAR)高精度成像。但BP算法计算量巨大,限制了其应用于SAR大场景大数据量快速成像。图形处理器(GPU)具有强大浮点运算和并行处理能力,为大场景BP算法快速成像实现提供了途径。结合GPU并行处理,提出了一种基于图像流的复杂运动SAR大场景BP快速成像处理方法。该方法借助BP算法中图像像素点相互独立处理的特性,采用图像像素点并行及图像流程处理,设计了孔径与图像缓存调度方案,提高SAR大场景大数据BP算法成像效率。仿真和机载实测数据结果验证了方法的有效性,在有限GPU显存条件下实现了8 192×8 192大场景快速成像,并且成像加速比相对于传统CPU单线程处理可达300倍以上。     

Digital cultures,acceleration and mega sporting event narratives

Mega sporting events, as with the evolution of human progress, continue to be marked by trepidation and awe over the transformational power of technology. Today, mega sporting events like the Olympic Games and World Cup are increasingly the captivating spectacles of consumer capitalism. Whereas, since the 1980s, established media organisations have exerted a significant influence over the production of mega sporting event narratives, the mass availability of everyday digital technologies democratises media making, changing the way events are conceived, planned, mediatised and reported. Citizens, living digitised and social mediated lifestyles, are now important co-creators, shaping the design, delivery and dissemination of events to a wider audience. This article explores the emergence of digital tools and technologies and their impact on mega sporting event media narratives. It highlights how social media and ubiquitous digital technologies augment accelerated identities. As a means of illustrating the acceleration agenda and its impact on mega sporting event coverage, the author presents a case study of a citizen media initiative #citizenrelay, which focused on the Olympic Torch Relay on its journey around Scotland, UK in the summer of 2012. The article concludes by suggesting that the digitally democratised citizen has power in their pocket to make media that, when brought together as part of a collective, can present alternative narratives to those offered by the established media frame.     

New product development in Asia: An introduction to the special issue

Given the increasing importance of Asia, the purpose of this special issue is to broaden the scope of our understanding of New Product Development (NPD) by going beyond the traditional Western research settings and looking at how new products are developed in Asia. This paper introduces the special issue on NPD in Asia and identifies key patterns of similarities and differences between Asian and Western NPD practices. The paper highlights key similarities and differences in the areas of organizational/top management support; technological proficiency; customer/market orientation; information sharing; cross-functional interface; entrepreneurship orientation; NPD strategies; innovation orientation; contingencies of innovation orientation; innovative marketing strategies; NPD process; appointment of project managers; rewarding team members; success rate; and cycle time.     

Driving-market or market-driven? A case study analysis of the new product development practices of Chinese business-to-business firms

Our current understanding of NPD processes among Chinese firms is limited. Early evidence suggests that the drivers of new product success in the PRC might be different to those in the West. Much of the more recent (Western) literature implicitly identifies the importance of both driving-market and market-driven approaches to NPD success, although what this translates into in practice is less clear. Drawing on multiple case studies, we identify four types of NPD practice in Chinese B2B firms and explore the reasons for variation in performance between the four. Critically, the most successful firms were found to be those characterised by a driving-market approach, rather than those relying solely on relationships and reacting to changing market phenomena.     

International R&D partnerships and intrafirm R&D–marketing–production integration of manufacturing firms in emerging economies

Although cross-functional integration is important for research and development (R&D), research about implications of cross-functional integration has been rather sparse. In new product development (NPD), no study to date has examined intrafirm as well as interfirm integration of key functions such as intrafirm R&D–marketing–production together with interfirm integration of host R&D–partner R&D. Such marketing and operations interface contributes to a better understanding of how operational and marketing activities impact on competitiveness and firm performance. This study collected data from 202 electronics manufacturing firms operating in an emerging economy, mainland China and Hong Kong with international R&D partnerships. The findings indicate that a high level of R&D integration between firms improved NPD performance when cross-functional integration is based on existing rather than new product configurations and key technologies. Interestingly, in high distance situations, cross-functional integration in the production validation stage generated NPD success. The findings show that high environmental uncertainties lead to a high level of host and partner firms R&D integration. However, product newness has no significant effects on R&D integration in any of the NPD stages.     

地铁上盖建筑振动响应预测及舒适度分析——以南京地铁1号线停车维修库综合体上盖住宅项目为例

对南京市地铁1号线车库段上部待建住宅楼进行研究,探讨地铁上盖建筑受地铁出入库振动的影响。通过现场测试与数值模拟,预测不同工况下待建建筑的振动响应以及室内振动加速度限值范围。模拟结果表明,采用底部加速度法将所测轨道、混凝土柱的振动输入计算模型中,可以获得待建建筑三向位移变化,并进行结构易损部位及预警分析,判断建筑安全性。通过模拟8种工况,计算得到1~80 Hz频率范围内各建筑楼板1/3倍频程中心频率下的加速度响应有效值和加速度振级,获取了住宅舒适度影响较大区域的具体坐标。研究成果对结构减振及舒适度提升具有参考意义。