Decentralized event-triggered H∞ control for switched systems with network communication delay

This paper is concerned with the decentralized event-triggered H_∞ control for switched systems subject to network communication delay and exogenous disturbance. Depending on different physical properties, the system state is divided into multiple communication channels and decentralized sensors are employed to collect signals on these channels. Furthermore, decentralized event-triggering mechanisms (DETMs) with a switching structure are proposed to determine whether the sampled data needs to be transmitted. In particular, an improved data buffer is presented which can guarantee more timely utilization of the sampled data. Then, with the proposed DETMs and data buffer, a time-delay closed-loop switched system is developed. After that, sufficient conditions are presented to guarantee the H_∞ performance of the closed-loop switched system by utilizing the average dwell time and piecewise Lyapunov functional method. Since the event-triggered instants and the switching instants may stagger with each other, the influence of their coupling on the H_∞ performance analysis is systematically discussed. Subsequently, sufficient conditions for designing the event-triggered state feedback controller gains are provided. Finally, numerical simulations are given to verify the effectiveness of the proposed method.     

Model transformation based sliding mode control of discrete-time two-dimensional Fornasini–Marchesini systems

This paper investigates the problem of sliding mode control (SMC) for discrete-time two-dimensional (2-D) systems subject to external disturbances. Given a 2-D Fornasini–Marchesini (FM) local state space model, attention is focused on designing the 2-D sliding surface and sliding mode controller, which guarantees the resultant closed-loop system to be asymptotically stable. Particularly, this problem is solved using the model transformation based method. First of all, sufficient conditions are formulated for the existence of a linear sliding surface guaranteeing the asymptotic stability of the equivalent sliding mode dynamics. Based on this, a sliding mode controller is synthesized to ensure that the associated 2-D FM system satisfies the reaching condition. The efficiency of the proposed 2-D SMC law design is shown by a numerical example. This paper extends the idea of model transformation to the 2-D systems and solves the SMC problem of a more general 2-D model in FM type for the first time.     

开放式创新视角下企业基于跨边界协同的新型追赶路径与模式初探

随着越来越多中国企业进入跟跑、并跑、领跑“三跑并存”的新型追赶阶段,如何有效配置与整合内外部资源成为企业能否实现全面追赶的关键问题。考虑到传统技术追赶理论对开放式创新范式下的追赶战略解释力有限,本文通过整合中国转型背景下的企业创新实践和相关研究,构建了一个开放式创新视角下的基于跨边界协同的新型追赶框架,并揭示了后发企业如何跨边界协同内外部资源,塑造动态平衡的新型追赶路径与模式。     

Ecological principle meets cancer treatment: treating children with acute myeloid leukemia with low-dose chemotherapy

Standard chemotherapy regimens for remission induction of pediatric acute myeloid leukemia (AML) are associated with significant morbidity and mortality. We performed a cohort study to determine the impact of reducing the intensity of remission induction chemotherapy on the outcomes of selected children with AML treated with a low-dose induction regimen plus granulocyte colony stimulating factor (G-CSF) (low-dose chemotherapy (LDC)/G-CSF). Complete response (CR) after two induction courses was attained in 87.0% (40/46) of patients receiving LDC/G-CSF. Post-remission therapy was offered to all patients, and included standard consolidation and/or stem cell transplantation. During the study period, an additional 94 consecutive children with AML treated with standard chemotherapy (SDC) for induction (80/94 (85.1%) of the patients attained CR after induction II, P = 0.953) and post-remission. In this non-randomized study, there were no significant differences in 4-year event-free (67.4 vs. 70.7%; P = 0.99) and overall (70.3 vs. 74.6%, P = 0.69) survival in the LDC/G-CSF and SDC cohorts, respectively. After the first course of induction, recovery of white blood cell (WBC) and platelet counts were significantly faster in patients receiving LDC/G-CSF than in those receiving SDC (11.5 vs. 18.5 d for WBCs (P < 0.001); 15.5 vs. 22.0 d for platelets (P < 0.001)). To examine the quality of molecular response, targeted deep sequencing was performed. Of 137 mutations detected at diagnosis in 20 children who attained hematological CR after two courses of LDC/G-CSF (n = 9) or SDC (n = 11), all of the mutations were below the reference value (variant allelic frequency <2.5%) after two courses, irrespective of the treatment group. In conclusion, children with AML receiving LDC/G-CSF appear to have similar outcomes and mutation clearance levels, but significantly lower toxicity than those receiving SDC. Thus, LDC/G-CSF should be further evaluated as an effective alternative to remission induction in pediatric AML.     

武汉大学面向本科生的数据素养通识课程的建设与思考

[目的/意义] 旨在通过分享武汉大学数据素养通识课程的建设过程，为同行开展相关工作提供参考。[方法/过程] 通过案例分析、数据统计和数据挖掘可视化方法对"武大通识3.0"背景下的《数据素养与数据利用》课程的教学目标、教学内容、教学特色以及教学效果进行分析，探索课程体系的合理性。[结果/结论] 授课方式和课内外实践内容的设置能够很好地调动学生学习的积极性，提高学习效果；课程考核结果、学生学习前后的问卷调查及课后反馈表明，课程学习明显提升了学生的数据素养。     

高校图书馆微信公众平台老年教师使用意愿影响因素研究

[目的/意义]老年教师的使用意愿不高严重影响了高校图书馆微信公众平台的发展与进步，因此需要研究高校图书馆微信公众平台的老年教师使用意愿影响因素。[方法/过程]对科技接受模型进行改进与扩展，基于结构方程，引入性别、年龄与经验等调节因素，搭建老年教师高校图书馆微信公众平台使用意愿模型，并基于四川高校的调研数据对模型与假设进行检验与分析。[结果/结论]研究结果表明：从整体来看，该模型对老年教师高校图书馆微信公众号使用意愿的总体解释效果良好；从各个影响因素来看：实用性感知以及群体影响对老年教师高校图书馆微信公众号使用意愿具有显著的正面影响，而生理机能显著反向影响其使用意愿。     

国外知识组织体系管理工具比较分析与启示

[目的/意义] 比较分析语义网技术发展环境下国外代表性知识组织体系管理工具的研究现状及关键功能，梳理相关研究的发展趋势。[方法/过程] 通过网络调研法，遴选国外10个代表性知识组织体系管理工具，从结构定义、项目维护、数据管理、互操作性、操作环境等方面比较分析其发展现状。在此基础上，为国内知识组织体系管理工具的建设工作提供建议。[结果/结论] 研究发现，国内知识组织体系管理工具的建设工作应依托语义网、关联数据、语义集成、语义互操作等技术促进功能创新，包括：灵活设计并配置多类型数据模型、支持可持续发展的管理与维护机制、支持用户分布式协同管理与控制、知识驱动的数据迭代式更新、面向语义的KOS重用与进化、建设以KOS为核心的知识组织框架等。     

殷钟麒学校档案管理思想研究

殷钟麒先生作为民国时期重要的文书档案学专家,提出了诸多档案管理方法。殷钟麒先生关注学校档案管理问题,他对学校档案管理制度、点收、分类、登记、编目、编卷、出纳等各环节进行系统的研究,提出学校档案管理办法,其学校档案管理思想在一定程度上推动了我国学校档案管理理论与实践的发展历程,其学校档案管理思想不仅对当时学校管理工作产生影响,同时对现行高校档案管理也具有重要的参考价值和启示意义。