疲劳驾驶研究进展综述

疲劳驾驶是世界性研究难题,目前已发展为国内交通安全研究热点之一,基于对疲劳驾驶相关专利、文献检索分析,得到国内外疲劳驾驶研究现状、研究热点与发展领域;然后对疲劳驾驶识别、疲劳驾驶预警,以及疲劳驾驶消除与控制三大核心技术的发展现状进行综述,指出疲劳驾驶发展方向。     

Comparing the impact of management support on police officers’ perceptions of discretionary power and engagement: Australia,USA and Malta

Abstract

This paper uses Social Exchange Theory as a lens for comparing the impact of management support upon police perceptions of discretionary power and employee engagement, across three countries. A survey-based, self-report process collected data from 193 police officers in Australia, 588 from the USA, and 249 from Malta. Structural equation modelling was used to analyse the data. The findings suggest a significantly different management support context across the three countries, as well as significantly different perceptions of discretionary power. Across the three countries, police perceived relatively poor satisfaction with organizational management support and only some engagement levels. However, USA police perceived significantly more discretionary power than the other country samples. These findings provide greater clarity about the link between management support, discretionary power and engagement for the police officers. Since employee engagement likely affects policing outcomes, the findings suggest that poor management support of police officers could negatively affect the provided service. Potential strategies to enhance police engagement include (a) training police managers about how to manage so as to promote greater engagement, and (b) modifying police managers’ performance indicators in line with achieving better police engagement.     

层次分析法在家具企业营销竞争力评价中的应用

随着家具企业竞争力比拼逐步聚焦于营销竞争力,如何对家具企业营销竞争力科学合理的评价就显得尤为重要.将AHP引入家具企业营销竞争力评价中,重新构建了评价结构模型,并通过评价过程中三个关键问题的论述,提高评价家具企业营销竞争力的有效性,为家具企业保持和提升营销竞争力提供努力的方向.     

Farmland prices and land-use changes in periurban protected natural areas

This paper provides empirical and conceptual insights in analysing the factors that determine the prices of farmland within Protected Natural Areas that are close to densely populated urban areas, the changes in land use experiences as well as the additional control policies needed to curb this unsustainable trend.The Urdaibai Biosphere Reserve nearby the metropolitan area of Bilbao (Basque Country, Spain) is the case study considered and its bordering non-protected rural area is used as a reference for comparison. A spatial hedonic farmland price model is estimated and the willingness of land purchasers to pay for different farmland characteristics quantified both inside and outside the Urdaibai Biosphere Reserve. The main results are that: (1) residential development is taking place in all categories of farmland, (2) aside from neighbouring prices, farmland prices depend on different factors depending on whether the marketed plots stand inside or outside the Protected Natural Area, (3) the “reserve effect” on land prices is less powerful than the “proximity to the metropolitan area (and motorway) effect” observed from villages of the non-protected area located in the 3rd crown of Bilbao, (4) the reasons for farmers non-compliance with policy regulations is the necessary knowledge base for the farmland conservation policy design and (5) in the light of the results, three development-control policy instruments such as Payments for Ecosystem Services, Tradable Planning Permits and development-taxes are discussed considering the factors that could improve compliance.     

射频功率放大器告警功能模拟检测方案

射频功放模块是基站系统中的核心部件,出厂前对射频功放模块的功能进行检测意义 重大。设计了一块告警功能测试板,通过观察与射频功放模块相连的测试板上的LED灯,判 断射频功率放大器功能是否正常。实践证明,该方法能模仿射频功率放大器在实际基站系统 中 的工作行为,不仅有效地提高了射频功率放大器的良品率,而且适用于商业化大规模批量生 产。     

我国电力工业在国民经济中的地位和作用研究

基于我国2007年投入产出表数据,运用影响力、感应度系数以及投入产出局部闭消费模型,定量研究了我国电力工业对宏观经济增长及各行业生产的拉动和推动情况,并测算了我国电力工业固定资产投资对经济增长所产生的直接和间接效益。研究结果表明：电力工业对经济增长的拉动和推动作用均高于全国平均水平,其推动作用在42个行业申位居第3位;受电力工业拉动和推动作用较大的行业主要有资源性行业、设备制造业、原材料及能源加工行业;电力投资带动的增加值累计占当年GDP的3.39％,其中间接效益是直接效益的48％,带动的劳动者报酬占当年全部劳动者报酬的3．05％,带动的生产税净额占当年全部生产税净额的3．65％：     

企业数字化转型提高了审计质量吗？——基于多时点双重差分模型的实证检验

企业数字化转型作为促进数字经济与实体经济相互融合的重要方式,对构建新发展格局、促进经济高质量发展有着至关重要的作用。综合考虑企业数字化转型的三个阶段及其特点,利用文本挖掘和人工阅读相结合的方法,从二维角度衡量企业数字化转型,以2009—2019年沪深A股上市公司为样本数据,采用多时点DID模型,考察了企业数字化转型对审计质量的影响及作用渠道。研究发现,企业数字化转型可以通过提高信息透明度和降低企业风险承担来提高审计质量;在进一步研究中发现,企业数字化技术应用有利于审计质量的提高,而商业模式创新作用并不明显;企业数字化转型对审计质量的提高主要出现在盈利、机构持股较高及非国有企业里,并且在2015年国家实施实体经济数字化转型产业政策方案后,企业数字化转型提高审计质量的作用表现得更为明显。研究结果拓展了企业数字化转型的审计后果,为注册会计师应对企业数字化转型中的错报风险提供了丰富的经验证据。     

森林资源资产组合随机控制模型及决策

在界定了森林生态资产与森林资源资产组合概念的基础上,构建和模拟了基于随机控制理论的森林资源资产组合模型,为森林经营管理者提出了相应的结论和建议:森林经营管理者可以根据最优采伐量与木材价格、补偿价格、成本系数、税率、贴现率、生长率等参数之间的关系,获得在市场经济变动条件下的最优森林资产组合,以保证森林资产净收益的稳定增长。     

中国电解铝行业市场支配力变迁的实证研究——基于2002—2009年的数据

选取2002—2009年中国电解铝行业的月度数据,以Baker和McGahan的NEIO模型为基础,利用未预期的负冲击是否会导致卡特尔厂商对竞争对手的欺诈行为而打价格战的模型,检验2002—2009年期间串谋等卡特尔行为是否存在。实证结果表明:2006—2009年期间中国电解铝行业存在明显的市场支配力,而不能确定2002—2005年市场支配力是否存在;2006—2009期间的平均市场支配力比2002—2005年高出0.3。提出行业本身属性、政府政策的引导、大企业保持额外产能是导致这种差距的三个主要原因。     

生态文明建设下风、光发电生态效益模拟与评估——以甘肃省为例

在我国生态文明建设日益受到重视的背景下,文章对风、光发电的生态影响进行了整体、全面的研究。首先,构建了分析风电和光伏发电对生态系统影响的系统动力学(system dynamics,SD)模型,并提出一种改进的耦合协调度模型;然后,以甘肃省为例进行SD情景模拟;最后,评估了多政策情景下甘肃省生态系统耦合协调度。结果表明,风电技改增效和光伏发电技改增效更有利于整个生态系统的发展。通过理论分析论证了甘肃省现行风、光发电政策的科学性,并为进一步发展风、光发电从而促进生态文明建设提出建议。