Multi-cluster distributed optimization via random sleep strategy     

Chong-Xiao Shi  Guang-Hong Yang 《Journal of The Franklin Institute》2019,356(10):5353-5377

In this paper, the distributed optimization problem over multi-cluster networks is considered. Different from the existing works, this paper studies the optimization algorithm under uncoordinated step sizes. More specifically, by combining a random sleep strategy and the round-robin communication among clusters, a new hierarchical algorithm is developed to solve the considered problem. In the proposed algorithm, the random sleep strategy enables each agent to independently choose either performing the projected subgradient descent, or keeping the previous estimate by a Bernoulli decision, based on which the step size of each agent is selected as an uncoordinated form that only relates to the independent Bernoulli decision variable. Technically, by introducing a key definition on the algorithm history, it is proven that the estimates of the proposed algorithm can converge to the optimal solution even with the uncoordinated step sizes. In addition, we also study the convergence performance of the proposed algorithm with simpler constant step sizes. In this case, it is proven that the random sleep strategy can efficiently improve the convergence accuracy of the algorithm. Finally, the theoretical findings are verified via simulation examples.  相似文献   

Mechanical analysis and ultimate boundary estimation of the chaotic permanent magnet synchronous motor     

Wei Xue  Mei Zhang  Shilong Liu  Yongli Li  Shijian Cang 《Journal of The Franklin Institute》2019,356(10):5378-5394

In this paper, we present the dimensionless form of a chaotic permanent magnet synchronous motor (PMSM). Its Kolmogorov formalism, which can be used to describe dissipative-forced dynamical systems, shows that there exist four types of torques, i.e., inertial torque, internal torque, dissipative torque and external torque. The mechanical analysis of the dimensionless PMSM is given for five different combinations of these torques. Numerical simulations show that the occurrence of chaos depends on these four types of torques. Moreover, the ultimate boundary estimation of the dimensionless chaotic PMSM is also investigated theoretically and numerically.  相似文献   

The approximation of the T–S fuzzy model for a class of nonlinear singular system with derivative of input     

Zhenghong Jin  Qingling Zhang 《Journal of The Franklin Institute》2019,356(10):5274-5292

In this paper, the approximation problem of T–S fuzzy linear singular system for a class of nonlinear singular system with derivative of input is considered and the nonlinear singular system has impulses. Consider a numerical example and a two-wheel drive robot, the T–S fuzzy singular systems are calculated for original system with derivative of input. According to solvability and steps of solving of the two examples, the results are extended to more generally nonlinear singular system with derivative of input. The theorem and algorithm that are given if input-state system is bounded impulse-free item and separable impulse item, it can be approximated by T–S fuzzy singular system with arbitrary accuracy. Finally, a numerical simulation is carried out to show the consistency with theoretical analysis and illustrate the effectiveness of approximation.  相似文献   

Towards a segmentation of science parks: A typology study on science parks in Europe     

Wei Keat Benny Ng  Rianne Appel-Meulenbroek  Myriam Cloodt  Theo Arentze 《Research Policy》2019,48(3):719-732

Although science parks are established globally for decades as an innovation policy instrument to foster growth and networking, there is limited attention given towards research into possible types within these real estate objects. Prior attempts in categorising science parks are characterised by the limited number of cases and/or variables. Science parks are believed to enhance innovation, entrepreneurship, and economic value for firms and regions. Past academic research showed mixed results on these performances and it is reasoned that distinct types within science parks exist that might explain these unclear results. We argue that before we can grasp what science parks can do, we should know what they are. Therefore, a survey on science park characteristics was completed by 82 science park managers in Europe. A cluster analysis was conducted which grouped the 82 participating science parks in three types; ‘research’, ‘cooperative’, and ‘incubator’ locations. Next, differences and similarities of these three types within science parks in Europe were analysed as a basis for advancing the academic debate. The types provide further understanding of science parks and offer researchers, practitioners, and policy-makers a means to compare, market, and benchmark science parks more adequately.  相似文献   

Science,technology and innovation studies at a crossroad: SPRU as case study     

Luc Soete 《Research Policy》2019,48(4):849-857

The setting up of the Science Policy Research Unit (SPRU) at Sussex University 50 years ago represented a “transformative change” in the research on science policy and the understanding of the nature and origin of technological change and innovation studies. It influenced policymakers across the world in both the mature Organisation for Economic Co-operation and Development countries and the developing world. It made the topic of science, technology and innovation (STI) familiar to business studies scholars. Today though, the analysis of STI appears to be somewhat in crisis. On the one hand, there is growing evidence that the growth and welfare gains of new technologies and innovation are no longer forthcoming in an automatic “trickle-down” fashion. The knowledge and technology diffusion “machine” appears broken. On the other hand, there are growing environmental concerns about the negative externalities of unsustainable fossil-fuel-based growth as industrialization spreads across the globe. STI policy appears somehow stuck in an industrial efficiency and consumerism mode that is unable to address in a satisfactory way the impact of such negative externalities. Can the broader historical approach as popularized within the so-called Science and Technology Studies (STS) tradition provide additional, complementary insights? Yes, if STI and STS scholars are prepared to leave their respective conceptual comfort zones and address in complementary fashion some of the major societal policy challenges confronting science, technology and innovation policy today.  相似文献   

广东省自然科学基金资助项目成果管理现状、问题及对策建议          下载免费PDF全文

段依竺  张银玲  林振亮 《科研管理》2019,40(10):278-281

成果管理是项目中后期管理中非常重要的部分,广东省自然科学基金通过多年来的管理实践,在项目申报、评审、立项等方面已经建立起一套比较完整的管理体系,但是作为中后期管理阶段的成果管理相比之下却非常薄弱。本文通过对广东省自然科学基金资助项目成果管理现状的分析,结合广东省自然科学基金管理工作的实际情况,针对性地分析广东省自然科学基金资助项目成果管理的主要问题,并提出思路和发展对策,为基金资助项目成果管理模式创新提供新思路。  相似文献   

基于SERVQUAL模型科技金融平台服务质量评测——以P2P网贷平台为例     

余庆泽  杨玉国 《科技管理研究》2019,(11)

《“十三五”国家科技创新规划》大力支持科技金融服务业发展。以“XK网贷平台”为例,开展200份问卷调查、分析137份有效样本数据,基于SERVQUAL模型、服务期望值和感知值的差距分析,以乘积标度法等工具计算服务质量评价指标及其五个服务维度的权重值,对服务质量进行量化测量及对服务质量差距作分析,最后从五个维度分析该平台服务质量问题,并对P2P网贷及科技金融服务平台的发展提出三个对策建议。  相似文献   

区域科技协同创新体系分析框架研究——以珠三角地区为例     

郑文江  俞佳敏  黄璐  陈璐怡 《科技管理研究》2019,(24)

当前,随着新一轮科技革命和产业变革正在加速演进,区域科技协同创新已成为加快区域一体化进程,提升区域国际竞争力的重要途径。区域科技协同创新体系的相关研究也随之剧增,但从政策规划角度分析,面临研究结论纷杂,理论支撑不足的困境。为此,本文基于驱动因素、合作层次以及创新模式三个角度,构建区域科技协同创新体系的三维分析框架,分析区域科技协同创新体系的现状和未来趋势。并以珠三角地区科技协同创新体系为例,阐述三维分析框架对战略规划和政策制度的参考意义。  相似文献   

期刊编辑部在做好出版伦理防控中的责任——Light: Science & Applications的实践探索     

常唯  张莹  白雨虹 《中国科技期刊研究》2019,30(1):9-13

【目的】 探讨科技期刊编辑部在出版伦理防控方面的责任与对策。【方法】 采用案例分析法对Light: Science & Applications在出版伦理防控方面的实践进行梳理,并对相关案例进行分析;同时,结合对理工类期刊遇到的其他相关案例的分析,探索期刊编辑部在出版伦理防控方面的对策与措施。【结果】 期刊编辑部应做好预防工作,制定详细的出版伦理相关规范来引导作者、审稿人、编委等利益相关方的行为,并通过提供必要的接口,进行必要的检查,给予必要的帮助等方式有效提醒相关方在论文写作、投稿、审稿、稿件处理等方面注意遵循伦理规范,严守学术诚信。【结论】 期刊编辑部在出版伦理防控方面应承担不可推卸的责任,应从政策上规范,技术上限制、警示。科学、客观地处理涉及出版伦理的事件,保持科学研究和学术交流的纯净。  相似文献   

企业科技项目后评价方法研究     

牛立全  李析  王雪松  刘嘉 《科技管理研究》2018,(14)

分析中国企业科技项目后评价现状,提出企业科技项目后评价应更多从管理角度总结科研项目成功经验、查找存在的问题;基于企业科技项目特点,提出被评价科技项目的 4种状态作为确定后评价指标和内容的基础;针对科技项目每种状态,基于企业科技项目管理特点,探索提出后评价指标和内容。  相似文献