超大型基坑与地下隧道群相互影响研究

为了解决城市复杂地下结构群之间相互影响的工程难题,依托深圳某预建商业建筑基坑和地下规划交通隧道工程,对基坑与隧道群相互影响力学行为以及考虑建筑附加荷载作用下下穿隧道管片配筋设计进行研究。采用有限元计算软件建立基坑与规划交通隧道群三维数值模型和高铁隧道管片配筋荷载-结构模型,分析管片内力、基坑结构位移等指标,评价基坑与地下隧道群的相互影响。结果表明：1)在现有基坑桩-筏板基础结构设计情况下,管片内力变化幅度最大为10.85%,对后期交通隧道近接建筑基坑的影响较小;2)地下规划交通隧道施工过程中对基坑结构位移影响有限,隧道开挖后桩基础最大水平位移为1.36 mm,竖向沉降为2.44 mm,筏板基础最大水平位移为0.41 mm,竖向沉降为2.40 mm; 3)在建筑附加荷载作用下,隧道管片最大内力出现在拱顶内侧和拱腰外侧,考虑弯矩传递系数ξ时隧道管片配筋需要加强。研究成果优化了既有桩基础影响下的隧道结构配筋,可以为城市复杂隧道群的设计与施工提供参考。     

Investigating beliefs,attitudes, and intentions regarding green restaurant patronage: An application of the extended theory of planned behavior with moderating effects of gender and age

This study aims to identify customer belief structures underlying the cognitive process of green restaurant patronage by applying the extended theory of planned behavior (TPB). The extended TPB model includes two additional predictors (past behavior and dining frequency) and two moderators (gender and age) to predict customers’ intention to visit green restaurants. This study followed recommended two-phase survey procedures. Salient beliefs of the target population were elicited in the first phase, and the relationships between those beliefs and other TPB constructs were analyzed in the second phase. Perceived behavioral control emerged as the most significant determinant followed by attitude and subjective norm in the Korean green restaurant context. The findings support the inclusion of past behavior as an additional predictor and confirm the moderating effects of gender and age. This study provides useful implications for effective marketing strategies for green restaurants.     

A change of perceived innovativeness for contactless food delivery services using drones after the outbreak of COVID-19

This study aims to identify how behavioral intentions are formed in the context of drone food delivery services using the moderating role before and after the outbreak of COVID-19. A conceptual model including eight hypotheses was developed and tested based on the data of two consumer samples, one collected before and the other after the outbreak of COVID-19. The data analysis results showed that perceived innovativeness positively affects attitude. In addition, the attitude, the subjective norm, and perceived behavioral control have a positive influence on behavioral intentions. Lastly, the outbreak of COVID-19 played a moderating role in the relationship between the attitude and behavioral intentions.     

美国对华5G科技竞争策略与对策研究——基于“大战略”理论视角

5G是引领未来的战略性技术,是实现产业升级的重要基础设施,也是中美科技竞争的关键领域。梳理美国对华5G科技竞争策略对于提升我国5G治理能力、创造竞争优势具有重要意义。运用“大战略”理论,从目标、手段、威胁、效益4个层面对美国5G策略进行分析,指出美国5G策略体现了维护国家安全和国际领导地位的目标,通过成立专职机构、加大科研投入、培养通信人才、提升频谱和基建能力等手段促进本国5G发展,并运用出口管制、外资审查、限制投资、外交结盟等方式对中国进行打压和防范。中美5G竞争日益激烈且存在彼此封闭、割裂的风险,国际关系将成为影响竞争态势的关键因素。中国应坚定战略目标,优化战略手段,应对挑战并把握机遇,积极推动中国5G健康发展。     

巨灾债券与巨灾保险风险分散

巨灾债券,作为一种债权合同,相对于巨灾再保险而言,虽然是一个两极端产品,但在分散风险方面具有其不可比拟的优势。在大额损失时,巨灾债券是巨灾再保险的一种很好的替代产品。另外,巨灾风险债券的发行对巨灾再保险免赔额具有积极影响。     

新中国成立以来我国政府与科技社团关系演变逻辑：基于间断均衡的政策分析框架

科技社团作为党和政府团结联系广大科技工作者的桥梁纽带,是国家创新体系的重要组成部分,也是建设科技强国的重要力量。基于间断均衡理论,使用政策文本分析方法对新中国成立以来我国政府与科技社团关系演变逻辑进行梳理,将其关系变迁历程划分为探索均衡期、强势间断期、弱势间断期、探索均衡期、发展均衡期、完善均衡期6个时期。研究表明,我国政府与科技社团间关系在政策变迁历程中展现出非线性、较高不确定性且伴有偶然性突变的特征;我国政府与科技社团关系的变迁先后经历了社会团体管理制度初步建立、“全能主义”盛行、改革开放的历史转折、监管与整顿、培育与监管、赋权与增能6个阶段的深刻调整;中央政府决策的注意力分配、焦点事件冲击、科技社团的策略性行动这3个要素以不同的作用机制改变科技社团的政策场域,进而影响我国政府与科技社团之间关系的变迁。     

“控制工程基础”教学模式探讨

针对控制工程基础课程具有概念抽象、内容复杂、多学科交叉、数学运算量大、工程实用性强、课时少等特点,提出了该课程理论与实验相结合的渐进式教学模式,即理论、实践、模拟仿真。在该模式下开展综合性实验,学生能够加深对理论知识的理解并提高运用知识分析解决问题实际的能力。     

Responsible supply chain management – an analysis of Taiwanese gutter oil scandal using the theory of constraint

Food safety is one of the main concerns in many countries throughout the world. Failure to ensure food safety would result in significant health concerns to the general public. Despite much effort to improve food safety, many cases of food safety issues or even crises have happened around the world from time to time; it results in undesirable health problems. One of the recent food safety scandals that happened in Taiwan in 2014 was related to the usage of gutter/tainted oil by several oil suppliers. The series of food safety incidents affected 1256 businesses. In order to ensure a responsible supply chain, we analysed the problem using the theory of constraint. Some issues towards the root cause of the problem are suggested. The objective of our study emphasises on building a responsible supply chain and food safety regulation in order to improve food safety in Taiwan.     

知识溢出创业理论:评述与未来研究方向

知识溢出创业理论认为,在位企业未利用或者未被充分利用的知识可以通过人才流动的方式溢出到社会中,从而形成创业机会。首先,梳理了知识溢出创业理论发展历程;然后,从国家、区域及企业3个层面论述了知识溢出创业理论研究现状和不足;最后,对知识溢出创业理论的未来研究方向进行了总结和展望。〖JP〗     

扩展的交易成本理论视角:经济组织治理逻辑的重新审视

传统的交易成本理论从资产专用性、不确定性和交易频率三个维度来分析经济组织治理,忽视了经济组织的生产属性.本文对交易成本理论进行了扩展,从生产层面增加了任务的复杂性、技术的可分解性和企业能力三个维度.从而构建起了两个层面、六个维度的经济组织的治理逻辑,并得出了相应的结论.