An agent-based simulation with NetLogo platform to evaluate forward osmosis process(PRO Mode)

Forward osmosis(FO), as an emerging technology, is influenced by different factors such as operating conditions,module characteristics, and membrane properties. The general aim of this study was to develop a suitable(flexible,comprehensive, and convenient to use) computational tool which is able to simulate osmosis through an asymmetric membrane oriented in pressure retarded osmosis(PRO) mode in a wide variety of scenarios. For this purpose, an agent-based model was created in NetLogo platform, which is an easy-to-use application environment with graphical visualization abilities and well suited for modeling a complex system evolving over time. The simulation results were validated with empirical data obtained from literature and a great agreement was observed. The effect of various parameters on process performance was investigated in terms of temperature,cross-flow velocity, length of the module, pure water permeability coefficient, and structural parameter of the membrane. Results demonstrated that the increase in all parameters, except structural parameter of the membrane and the length of module led to the increase of average water flux. Moreover, nine different draw solutes were selected in order to assess the influence of net bulk osmotic pressure difference between the draw solution(DS) and feed solution(FS)(known as the driving force of FO process) on water flux. Based on the findings of this paper, the performance of FO process(PRO mode) can be efficiently evaluated using the NetL ogo platform.

Optimal Sliding Mode Control with Specified Decay Rate for Offshore Steel Jacket Platforms

An optimal active sliding mode controller with specified decay rate design is proposed to control the wave-induced offshore jacket-type platform with active mass damper （AMD）. Irregular wave loading is approximated by finite sums of Fourier series, and its dynamic characteristics are governed by an exosystem derived from the linearized Morison equation. The offshore platform system is first decomposed into two virtual subsystems based on a linear transformation. By considering the velocity of AMD as a virtual control force for the first subsystem, the optimal virtual controller is derived. Furthermore, an optimal sliding mode surface with specified decay rate is proposed. Then, the active sliding mode controller is designed to ensure that the state trajectories reach the sliding surface in finite time and remain on it thereafter. Numerical simulation is employed to verify the effectiveness of the proposed approach.

Concept Design,Modeling and Station-keeping Attitude Control of an Earth Observation Platform

The stratosphere airship provides a unique and promising platform for earth observation. Researches on the project design and control scheme for earth observation platforms are still rarely documented. Nonlinear dynamics, model uncertainties, and external disturbances contribute to the difficulty in maneuvering the stratosphere airship. A key technical challenge for the earth observation platform is station keeping, or the ability to remain fixed over a geo-location. This paper investigates the conceptual design, modeling and station-keeping attitude control of the near-space earth observation platform. A conceptual design of the earth observation platform is presented. The dynamics model of the platform is derived from the Newton-Euler formulation, and the station-keeping control system of the platform is formulated. The station-keeping attitude control approach for the platform is proposed. The multi-input multi-output nonlinear control system is decoupled into three single-input single-output linear subsystems via feedback linearization, the attitude controller design is carried out on the new linear systems using terminal sliding mode control, and the global stability of the closed-loop system is proven by using the Lyapunov theorem. The performance of the designed control system is simulated by using the variable step Runge-Kutta integrator. Simulation results show that the control system tracks the commanded attitude with an error of zero, which verify the effectiveness and robustness of the designed control system in the presence of parametric uncertainties. The near-space earth observation platform has several advantages over satellites, such as high resolution, fast to deploy, and convenient to retrieve, and the proposed control scheme provides an effective approach for station-keeping attitude control of the earth observation platform.

适应多种实验教学管理模式的数字化平台研究与建设

针对学院多门实验课程的教学管理无法在同一个实验教学管理数字化平台上实现的问题,通过调研高校目前实验室开放管理中采用的教学管理模式,进行分类研究,开发出一套面向多种开放管理模式的实验教学管理数字化平台。利用该平台实现现有12门实验课程的多种模式教学管理,包括在线排课与选课、学生预约实验课程、课程成绩管理等功能,并能够在没有教学任务时,根据实验室设备的空闲情况,学生可通过预约进行自主性实验,达到学生、教师、实验室的时间和空间的最优化组合。该平台具有一定的通用性,可以在其他院校推广应用。

Application of Five-in-One Community Management Mode plus Wuhan’s Regional WeChat Platform in the Novel Coronavirus Control

In this study, the five-in-one community mass prevention and mass treatment group established in Wuhan to curb novel coronavirus outbreak in 2019 to 2020 is introduced. Various public health propaganda methods are used, including community loudspeakers and community bulletin boards. In the meantime, WeChat platform account named “Wuhan neighborhood on WeChat” is registered and opened, and a Group Chat on WeChat is created for grid management. A diversity of on-line and off-line countermeasures against the novel coronavirus outbreak are implemented via the WeChat platform: three-early measures (early discovery, early reporting, and early treatment), centralized management, community-based reporting, hierarchical diagnosis, and treatment system, isolation of mild patients at designated facilities, diagnosis and treatment appointment system for patients with fever, patient transferral in special vehicles, terminal disinfection at homes, psychological support and daily caring plan for special populations. This WeChat platform allows for an all-region, all-around, all-time and entire population-coverage control of novel coronavirus outbreak, with the extension and strengthening of health propaganda, guidance for seeking medical assistance, mass prevention and mass treatment, and health self-management among the community residents. Great effect has been achieved in novel coronavirus control so far. The five-in-one community management mode of Wuhan plus “Wuhan neighborhood on WeChat” plays an important role in relieving the shortage of health service resources and resolving the problem of limited service scope of professional medical staff in Wuhan, and ultimately contributes to the overall novel coronavirus control.

Designing Higher Vocational College English Blended Learning Mode based on Wechat Platform

As a platform bridging classroom teaching and online teaching for higher vocational college(HVC)English,WeChat expands the dimension of HVC English teaching.This paper first introduces basic functions and characteristics of WeChat,then analyzes problems existing in current HVC English teaching and finally puts forward specific ways to design HVC English blended learning mode based on WeChat platform in four steps:warming-up,text analysis,exercises and post-course expansion.

社交商务平台的同质性、茧房效应及破解策略研究

社交商务作为数字经济的重要组成,拥有巨大的市场潜力,但也面临着平台发展模式同质化等问题,导致形成固化用户的自我认识和网络信息行为的信息茧房。由于社交媒体的多样性、群体关系复杂性,茧房效应与社交商务结合的研究有待进一步挖掘。通过中国知网和Web of Science核心集,截至2023年3月31日,检索并筛选获取606篇相关文献,运用社会网络分析方法进行分析。其中300篇中文文献重点探讨个性化推荐算法对信息茧房形成的影响,306篇英文文献更多关注信息茧房与平台和用户行为之间的关系。基于信息茧房相关概念的研究明确其内涵和特征,根据平台、算法和用户3个维度的作用机制分析构建信息同质化视角下信息茧房形成机制框架,即社交平台内外部信息趋同导致了用户选择同质化、平台内容同质化以及用户群体同质化问题,并以正反馈的形式不断加强,最终形成信息茧房。由此,基于同质化视角,分别从政府、平台和用户3个主体层面提出社交商务平台应对信息茧房的策略。

基于微信平台的闭环健康教育模式在门诊慢性前列腺炎患者中的应用

目的:探讨基于微信平台的闭环健康教育模式在门诊慢性前列腺炎患者中的应用效果。方法:选取2020年6月1日~2022年6月1日在门诊收治的96例慢性前列腺炎患者为研究对象,按照随机数字表法分为干预组和对照组各48例,对照组实施常规护理模式,干预组在对照组基础上实施基于微信平台的闭环健康教育模式;比较两组护理前后临床症状改善情况[采用前列腺炎症状指数(NIH-CPSI)]、疾病认知度、负性情绪[采用焦虑自评量表(SAS)和抑郁自评量表(SDS)]、自我效能和勃起障碍[采用一般自我效能感量表(GSES)和国际勃起功能问卷表-5(IIEF-5)]、生活质量[采用生活质量综合评定问卷(QOL)]、护理满意度。结果:护理后,两组GSES、IIEF-5、QOL评分均高于护理前(P<0.05),且干预组高于对照组(P<0.01);护理后,两组NIH-CPSI、SAS、SDS评分低于护理前(P<0.05),且干预组低于对照组(P<0.01);干预组护理满意度高于对照组(P<0.05)。结论:基于微信平台的闭环健康教育护理模式可以改善慢性前列腺炎患者的临床症状,减轻患者负性情绪和勃起障碍,从而提升患者自我效能和生活质量。

基于信息平台的发热门诊就诊模式优化实践

通过医院信息化建设整合患者诊疗数据,并用于智能服务设备、信息自动采集、信息区域共享。实现基于医院信息平台的发热门诊就诊模式,优化资源配置,减少患者候诊时长,提高患者满意度,同时强化发热门诊在新型病毒监测方面的哨点作用。该模式为发热门诊的整体诊疗流程提供了有力的支持,在改善患者就医体验、节约医院成本、院感防控方面均具有一定意义。

基于学习通教学平台的数学建模竞赛培训模式的实践与研究

文章以常州大学为例,探讨基于学习通教学平台的数学建模竞赛培训模式的实践与研究。首先分析了学习通教学平台的优势,介绍了数学建模竞赛培训的常见模式;接着提出了基于学习通教学平台的数学建模竞赛培训模式构建思路及教学内容规划,并对其教学实施进行了探讨。通过研究,旨在为数学建模竞赛培训提供一种新的教学模式,以期提高学生的数学建模竞赛能力。

基于PI建模和反步滑模控制的主动波浪补偿策略

海上起重船受风、浪、涌影响会产生剧烈的船舶姿态变化,造成起重机和货物的位姿变化,对货物和人员存在安全隐患,波浪补偿平台的稳定性控制能有效减少复杂海况下船舶运动对海上作业安全性、稳定性和精准性的影响,对浮式起重船海上设备精准装载作业极其重要。针对补偿平台的迟滞非线性导致的建模困难和控制不精确问题,本文提出基于PI(Prandtle–Ishlinskii)建模和反步滑模控制的主动波浪补偿策略。首先,通过实验得到补偿系统的迟滞效应曲线,分析系统迟滞环建立PI迟滞模型,并采用递推最小二乘法辨识模型的各个参数,从而求得系统模型。然后,基于李雅普诺夫(Lyapunov)稳定性设计反步控制补偿方法,并结合滑模控制规律加快初始控制速度。最后,将反步滑模法应用于补偿系统,采用MATLAB软件仿真在规则波和不规则波下的响应来验证算法和模型的正确性,并在工控机中用C#编写控制程序,驱动运动控制卡控制伺服电机带动电缸进行补偿运动,同时通过传感器采集系统运动的实时数据,并反馈给工控机形成闭环,以期验证补偿平台在补偿规则波和不规则波下的补偿效果。实验结果表明,所建立的斯图尔特(Stewart)浮式平台中,PI迟滞模型具有良好的精度,反步终端滑模控制算法在Stewart平台的实际控制中能够很好地补偿波浪运动,相比比例–积分–微分控制(PID)、反步法、强化学习等控制方法,反步终端滑模方法能快速较好跟踪期望位移,补偿精度达到0.9729。

基于电商平台信用支付的供应链协调管理研究

电商平台信用支付对供应链协调发展具有十分重要的作用。为深入探究基于电商平台信用支付的供应链协调管理,通过使用模型构建方法对不同模式下的供应链协调决策进行分析,寻求市场竞争条件下,供应链整体利益最大化时,供应商和消费者所能提供的信用期限和订货期限的最优解。同时以模型数据信息为基础提出供应链协调管理优化建议,以期为电商平台稳定健康发展奠定良好的基础保障。

智能化背景下高职机械类专业人才培养模式研究

智能制造理念已深入各行各业,高职机械类专业人才培养也需要适应智能制造技术的发展。文章分析了智能制造背景下高职机械类专业人才培养过程中存在的问题,从明确专业人才培养目标,基于“产学研创”创建具备技术创新与教学科研能力的双栖型教师团队等方面对高职机械类专业人才培养模式进行了研究;提出通过整合多方资源,打造基于校企合作的机械类专业智能制造教学平台,创新教学方式,采取“一课两师”的教学方式提升高职机械类专业教学质量,最终形成智能化背景下的高职机械类专业创新型人才培养模式。

基于THEOL平台的微生物学混合教学模式探索与实践

微生物学是生命科学领域最重要的基础课程之一,课程理论性强,微观抽象,学习难度大,而信息网络技术和云技术的快速发展为高校课程改革提供了新的契机,为该课程线上线下混合教学模式的改革探索提供了支撑。本课程教学方案设计坚持立德树人的教学总要求和以学生发展为中心的教育理念,以微生物学课程第一章“细菌的革兰氏染色”为例,探讨使用THEOL平台开展微生物学混合教学模式改革的教学设计、实践和考核评价,突出改革的必要性,进而提升大学生的持续学习能力和创新发展意识,为培养具有创新能力的复合型人才奠定基础。

重混创作的用户生成内容著作权问题研究

数智化时代的技术加持、智能手机APP的飞速发展,使得重混创作的用户生成内容持续迸发出勃勃活力。合理界定重混创作的用户生成内容并分析其引发的相关著作权问题有利于促进文化传播和知识创新。虽然可以采用“差异化独创性标准”对重混创作进行保护,但重混创作毕竟要利用在先作品,因此必须要明确是否构成侵权或者合理使用,采用“转换性使用”的标准具有一定的合理性,将其纳入合理使用兜底性条款开创了判断重混创作的用户生成内容构成合理使用的新路径。从保障公众参与文化的角度提出了用户“使用者权”,以积极性权利激发用户重混创作的活力;从保障著作权人固有正当利益的角度建议设置“选择退出”的消极许可模式,从而更好地调和著作权人与用户的关系,推动文化市场的扩展和文化价值的传播;从技术赋能的角度促使重混创作UGC平台服务者在事前阶段积极行动、主动作为,以营造风清气正的平台环境,提高用户社交体验感。

Vortex-Induced Vibration of a Tension Leg Platform Tendon:Multi-Mode Limit Cycle Oscillations

This paper studies the application of mathematical models to analyze the vortex-induced vibrations of the tendons of a given TLP along the Indian coastline, by using an analytical approach, using MATLAB. The tendon is subjected to a steady current load, which causes vortex-shedding downstream, leading to cross-flow vibrations. The magnitude of the excitation(lift and drag coefficients) depends on the vortex-shedding frequency. The resulting vibration is studied for possible resonant behavior. The excitation force is quantified empirically, the added mass by potential flow hydrodynamics, and the vibration by normal mode summation method. Non-linear viscous damping of the water is considered. The non-linear oscillations are studied by the phase-plane method, investigating the limit-cycle oscillations. The stable/unstable regions of the dynamic behavior are demarcated. The modal contribution to the total deflection is studied to establish the possibility of resonance of one of the wet modes with the vortex-shedding frequency.

网络CBL-PBL教学在泌尿外科教学中的应用

探索基于网络平台的CBL-PBL教学模式在“泌尿外科疾病”教学中的应用效果,选取同一学期内的苏州大学苏州医学院临床医学专业学生62名,随机分为两组,分别接受基于网络平台的CBL-PBL教学模式(38名学生)和传统教学模式(24名学生),比较分析两种教学模式在“泌尿外科疾病”教学中的教学效果差异。在对教师满意度评分、病情分析、治疗节点鉴别、个体化方案选择能力等方面接受CBL-PBL模式教学的学生均显著优于接受传统教学模式的学生(p<0.05)。此外,教师对接受CBLPBL模式教学的学生的满意度也优于接受传统教学模式的学生(p<0.05)。基于网络平台的CBL-PBL教学模式在“泌尿外科疾病”教学中的教学效果优于传统教学模式,适宜推广和应用。

基于ESB模式的医疗信息集成平台构建与应用实践

目的为减少应用系统间的重复调用与系统开销,统一服务接口与数据标准,实现医疗信息集成与互联互通。方法搭建医疗信息集成平台,通过企业服务总线(ESB)互联互通接口服务将医院各应用系统对接到信息集成平台上。结果应用ESB模式的医疗信息集成平台实现了系统资源共享与互联互通。以江南大学附属医院为例,顺利完成了院区搬迁、系统融合以及历史数据迁移。结论基于ESB模式的医疗信息集成平台,在推进院区信息集成与医院信息互联互通标准化建设方面,发挥了积极作用。

电工电子仿真实验线上线下混合教学模式探索

为满足电工电子实验教学改革和公共突发事件教学预案的需求,基于线上会议平台和翻转课堂设计了电工电子的仿真实验,解决了时空不一致时实验教学难以实施的问题。以“串联电路中电感电容的共振现象”实验为例介绍了新的教学模式,实现了课前推送实验理论资料、实时测验预习情况、数字化实验报告和教学资料及线上线下混合教学的功能,在督促学生预习、灵活投屏答疑、个性化培养等方面存在优势,在本科生电工电子实践教学中取得了良好的效果。

压电平台高精度自适应分数阶滑模跟踪控制

为了实现压电平台高精度指令跟踪控制,针对其存在的严重迟滞问题,本文提出了一种自适应分数阶滑模跟踪控制方法。首先,根据Duhem模型结构将分数阶算子和自适应律引入到滑模面的设计过程中,增加滑模面的自由度可变性并实现了滑模面参数的自适应调节;其次,利用不确定和干扰估计方法代替传统的滑模控制器切换项,解决了滑模控制器存在的抖振问题并提高了控制器的鲁棒性。最后,通过压电平台指令跟踪控制实验结果表明:相较于PID和传统的滑模控制方法,提出的自适应分数阶滑模控制器的指令跟踪误差减小了80%以上,在50 Hz参考指令信号下自适应分数阶滑模控制器将压电平台的平均跟踪误差降低到0.41μm。因此,自适应分数阶滑模控制方法具有更加优越的跟踪性能。