ON THE CENTER OF GENERALIZED LIENARD SYSTEM

This paper discusses the local and global center of the generalized Lienard system, gives two theorems which extend and improve the relative results of [1]-[3]. Moreover the lemmas in this paper are also useful to the study for the oscillation, stability and the existence of limit cycles of the generalized Lienard system.

THE LOCAL CENTER OF GENERALIZED LIENARD SYSTEM

This paper gives a theorem for the local center of generalized Lienard system; the relative theorems in the references can be deduced from our corollaries.

SDN Orchestration for Dynamic End-to-End Control of Data Center Multi-Domain Optical Networking

New and emerging use cases, such as the interconnection of geographically distributed data centers(DCs), are drawing attention to the requirement for dynamic end-to-end service provisioning, spanning multiple and heterogeneous optical network domains. This heterogeneity is, not only due to the diverse data transmission and switching technologies, but also due to the different options of control plane techniques. In light of this, the problem of heterogeneous control plane interworking needs to be solved, and in particular, the solution must address the specific issues of multi-domain networks, such as limited domain topology visibility, given the scalability and confidentiality constraints. In this article, some of the recent activities regarding the Software-Defined Networking(SDN) orchestration are reviewed to address such a multi-domain control plane interworking problem. Specifically, three different models, including the single SDN controller model, multiple SDN controllers in mesh, and multiple SDN controllers in a hierarchical setting, are presented for the DC interconnection network with multiple SDN/Open Flow domains or multiple Open Flow/Generalized Multi-Protocol Label Switching( GMPLS) heterogeneous domains. I n addition, two concrete implementations of the orchestration architectures are detailed, showing the overall feasibility and procedures of SDN orchestration for the end-to-endservice provisioning in multi-domain data center optical networks.

Influence of Recombination Centers on the Phase Portraits in Nanosized Semiconductor Films

Influence of recombination centers’ changes on the form of phase portraits has been studied. It has been shown that the shape of the phase portraits depends on the concentration of semiconductor materials’ recombination centers.

Team center下全液压坑道钻机通用件库的建立及应用

全液压坑道钻机研发设计过程中,通用件建模工作量大、耗费时间。在基于Team center系统的UG平台上,对建立坑道钻机通用件库的方法与步骤进行了研究,并通过Team center系统的信息共享和集成,提高钻机零件设计的唯一性、准确性和一致性,为提高钻机设计效率、缩短设计周期,提升钻机研发设计品质提供了途径。

The Post-90s Generation Poising to Take the Center Stage

Te post-90s generation grew up in a period when China saw rapid economic growth underscored by rampant globalization. Tose young people, with their enthusiasm, openness, and freedom, have injected new energy and exerted a subtle infuence on the Chinese society, which in turn opens up infnite possibilities for themselves and the future of China.

Generalized Isochronous Centers for Complex Systems

In this paper, the definition of generalized isochronous center is given in order to study unitedly real isochronous center and linearizability of polynomial differential systems. An algorithm to compute generalized period constants is obtained, which is a good method to find the necessary conditions of generalized isochronous center for any rational resonance ratio. Its two linear recursive formulas are symbolic and easy to realize with computer algebraic system. The function of time-angle difference is introduced to prove the sufficient conditions. As the application, a class of real cubic Kolmogorov system is investigated and the generalized isochronous center conditions of the origin are obtained.

ON THE NON-EXISTENCE OF PERIODIC SOLUTIONS OF A GENERALIZED LIENARD SYSTEM

In this paper,some known results concerning the nonexistence of non-trivial periodic solutions for the Lienard system are extended to the more general system

On the Center Problem for Generalized Abel Equations

This paper is devoted to the conditions of the existence of CC-center for the generalized Abel equations.Using some new original methods,we obtain extended results of the main theorems in the paper by Llibre and Valls(2020)and the one by Zhou(2020),respectively.The proofs in this paper are much simpler than the previous ones.

Center and Isochronous Center Problems for Quasi Analytic Systems

This paper considers the problems of determining center or focus and isochronous centers for the planar quasi-analytic systems. Two recursive formulas to determine the focal values and period constants are given. The convergence of first integral near the center is proved. Using the general results to quasi-quadratic systems, the problem of the isochronous center of the origin is completely solved.

Power System Transient Stability Analysis with Integration of DFIGs Based on Center of Inertia

As power systems experience increased wind penetration,an effective analysis and assessment of the influence of wind energy on power system transient stability is required.This paper presents a novel center of inertia(COI)approach to understand how integrated doubly fed induction generators(DFIGs)affect the transient dynamics of a power system.Under the COI coordinate,the influence of integrated DFIGs is separated into the COI related and individual synchronous generator related parts.Key factors that affect the COI’s dynamic motion as well as the rotor dynamics of each individual synchronous generator with respect to the DFIG integration are investigated.To further validate the analysis,comparative simulations of three different scenarios with varying DFIG capacities,access locations,and the replacement of synchronous generators are conducted.The results show that the dynamics of the COI and the individual generators are affected by the integrated DFIGs via different mechanisms,and are sensitive to different variables in the DFIG’s integration condition.

On the Conditions of a Center and General Integrals of Quadratic Differential Systems

We give the general integral of quadratic differential system with center in two cases under the Chinese classification.

生成式人工智能背景下企业知识管理系统的构建及发展

通过文献调查法和类比分析法,以企业知识创新产出为核心目标,将知识管理的发展归纳为3个不同的时代,并鉴于仿生学、工程学、管理学三者的交叉对比,构建智能生成时代知识管理系统的基本框架,并将人工智能(AI)技术、智能中心、知识资产作为智能知识管理的三大要素,最后提出元宇宙虚拟世界和现实世界相结合的开放型知识管理构想理念模型。研究(1)明晰了生成式AI未来将渗透到各个组织层面的发展趋势;(2)结合主客观因素提出了生成式AI企业知识管理系统的基本框架及运作机理,为有效解决组织知识创新产出的内涵及运转提供了新的思路;(3)理论上建立了以智能中心为核心驱动力的知识创新管理理论系统,为生成式AI产业的智能发展提供了一定的理论支撑。

创新社区健康教育在全科住院医师规范化培训中的应用

目的探讨创新社区健康教育在全科住院医师规范化培训中的应用效果。方法选取上海交通大学附属新华医院2016级至2020级全科住院医师48名,在第三年进入社区卫生服务中心后随机分为传统组和创新组开展社区健康教育。传统组采用单人幻灯片演讲,创新组采用创新健康教育。开展6个月后评价两组临床技能和临床沟通能力的差异,并行问卷调查。结果在临床技能评分中,创新组在健康教育方面明显优于传统组(P<0.05)。在临床沟通能力方面,创新组SEGUE量表总分高于传统组[(19.8±2.5)分比(18.8±2.8)分,P<0.05]。在5个维度中,创新组在沟通启动、信息收集、理解患者方面评分均高于传统组(P<0.05)。问卷调查显示创新组均认同创新健康教育较传统方式具有更好的实施效果。结论创新社区健康教育在全科专业住院医师中接受度较高,有助于提高其健康教育能力、沟通能力和科普素养。

基于CIPP模式的消毒供应中心普通工人培训体系构建

目的研究CIPP模式运用于消毒供应中心普通工人培训中的有效性。方法在2023年1月—3月期间,我院消毒供应中心24名普通工人接受了传统培训方式为管理前。随后,于2023年7月—9月,采用以CIPP模式为核心的培训体系进行培训为管理后。培训结束后,运用SPSS13.0统计学软件对考试考核成绩和训练评价进行数据分析。结果经过对普通工人进行技术培训,教学成果相较于培训前有所提升。结论通过将CIPP模式应用于消毒供应中心普通工人培训教学,可以提升普通工人对基础知识和专业技能的掌握,减少操作过程中的技术失误,提高无菌物品的品质,降低院内感染的风险,从而确保患者的安全。

叙事医学视域下全科医学专业型研究生人文素养提升策略分析

全科医学专业型研究生作为高层次全科医师的储备力量,其人文素养将直接影响基层医疗长期稳定的服务质量。通过结合叙事医学的内涵及临床应用,分析全科医学专业型研究生的培养现状,综合提出将叙事医学应用于全科医学专业型研究生人文素养培养的具体实施策略。旨在将叙事医学理念渗透到全科医学专业型研究生的培养中,为提升全科医学专业型研究生的人文素养提供新的视角,还可在一定程度上改变我国基层医疗全科医师队伍质量不高的现状。

新生代大学生群体观念与群体行为特点的解读及其应对策略

网络信息技术的加速创新,对新生代大学生群体思想政治教育工作提出了挑战,要求其必须遵循学生成长规律。通过对三所高校2 000名学生的调查研究,运用SPSS软件和潜在剖面分析,从人生观、价值观、就业观、道德观和学习观5个方面对新生代大学生群体思想观念和行为特征进行整体描述统计、差异分析以及类别拟合研究。研究结果显示:新生代大学生思想行为积极健康、值得信赖,且大学生思想行为存在差异性,对新生代大学生思想和行为的引导应从专业教育、就业观念、学风建设等方面开展,从而提高教育实效性、针对性和个体适应性。

感受性视角下人智交互研究:主题挖掘、方法识别、未来发展

[目的/意义]人工智能研究正经历从人工智能主义到人本人工智能主义的视角转变。将两视角看作两“桥墩”,感受性因强调人和人工智能代理之间的关系过程,成为架起通向更准确、高效人工智能理解的“桥梁”。以感受性为视角,系统梳理以人智交互为对象的相关研究主题、方法与发展具有重要意义。[方法/过程]以现有国内外文献为基础,借助开放式编码从人智需求识别和人智交互体验两方面以及研究方式、研究方法论、研究方法三方面进行研究主题和方法回顾,继而对感受性视角下人智交互的未来研究方向进行展望。[结果/结论]一方面,以人智能力和信息需求识别为研究主题,利用定性研究方法探索人和人工智能代理双方的认知感受性;另一方面,以人智能力差异和人智体验评估为研究主题,借助定量研究方法量化人和以用户为中介的人工智能代理的感知感受性。[创新/局限]从研究工具升级、研究主题扩展、研究要素嵌套三维度来提升现有研究框架;以定性描述为主,未来需进一步加强定量分析。

大规模风电接入场景下的失步振荡中心定位方法

振荡中心的准确定位是失步保护正确动作的基础,大规模风电并网导致系统阻抗参数发生变化,使得传统基于阻抗轨迹的失步定位方法的适应性严重下降。针对该问题,提出基于节点频差的失步振荡中心定位方法。首先分析大规模风电并网对系统总阻抗的影响。进一步根据发电机功角,计算其曼哈顿距离相似度并构建启动判据。最后,通过移动平均法对广域测量频率进行平滑处理,提出基于节点频差的失步振荡中心定位方法。仿真验证表明,所提基于节点频差的失步振荡中心定位方法受噪声影响较小,不受风电渗透率的影响,能够准确定位失步振荡中心位置。

将叙事医学渗透到全科医学教学查房的思考

全科医学追求全人理念,十分重视将人文精神有机融入医疗过程。因此,培养全科医生、提升医学人文素养显得尤为重要。叙事医学是真正体现人文关怀和尊重患者人性的学科,有利于将人文精神融入临床实践。以上二者存在天然耦合性。文章从叙事医学视角出发,介绍了叙事医学的发展、作用及意义,分析了目前全科医学住院医师规范化培训中教学查房存在的一些问题,提出以叙事医学为专题教学查房的设想,助力解决全科医学中人文精神技能教育不足的问题,为今后将叙事医学融入全科医学人才培养体系提供参考。