Joint Centralized Power Control and Cell Sectoring for Interference Management in CDMA Cellular Systems in a 2D Urban Environment

The interference reduction capability of cell sectoring and power control algorithms have been considered separately as means to decrease the interference in Code Division Multiple Access (CDMA) cellular systems. In this paper, we present Switched-Beam (SB) and Rotatable Equal Sectoring (RES) techniques for CDMA cellular systems in a 2D urban environment. In the SB technique by using a number of fixed, independent, or directional antennas we increase the downlink capacity of the CDMA systems. Also in the RES method, the equal sectors of the base stations are rotating together to decrease the inter-cell and intra-cell interferences. Also in this paper we use centralized power control to overcome the near-far problem. Simulation results indicate that the proposed techniques considerably increase the capacity of the CDMA cellular systems compared to ordinary Equal Sectoring (ES) method.

The Research about the Trans-provincial Centralized Bidding Trading Market of East China Power Grid --I:Empirical Analysis

The clearing price and bidding price in electricity market are two key indicators to measure whether it is reasonable or not. Based on the grey incidence analysis, this paper studies the correlation coefficient between the clearing price and bidding price with the generation cost, the supervision and rules of the market, the supply and demand situation, the behavior of market members over the same period, which is based on the actual data of the trans-provincial centralized trading market of East China Power Grid. The results show that the factors affecting the clearing price and bidding price from largest to smallest are generation cost, supervision and rules of the market, the supply and demand situation, the behavior of market members. The conclusion is that the trans-provincial trading platform of East China Power Grid is a reasonable regional market which can discover the market cost, and regulate the market supply and demand balance, and promote healthy competition.

A Steady State Voltage Stability Analysis of Wind Power Centralized System

It is significant to research the voltage stability of the wind power centralized system (WPCS) for the effective development of the large scale clustering wind energy resources. A steady state voltage stability analysis of the WPCS by employing the PV curve and model analysis is proposed to reveal the voltage stability influence from different aspects. The PV curve is utilized to trace and indicate the voltage collapse point of the WPCS when the small disturbance of wind power is increased gradually. Then the steady state voltage instability modes of the WPCS are analyzed by calculating the bus participation factors of the minimum eigenvalue model at the collapse point. The simulation results of an actual WPCS in North China show that the static state voltage instability mode of the WPCS is closely related to the operating features and control strategies of different reactive power sources. In addition, the implementation of the doubly-fed induction generator wind turbine generator voltage control is beneficial to improve the WPCS voltage stability.

The Research about the Trans-provincial Centralized Bidding Trading Market of East China Power Grid --II:Model Analysis

In this paper a novel cost function based on the relationship between operation cost of unit and generation load rate is employed in an agent-based model of Trans-provincial Centralized Bidding Trading Market of East China Grid. Simulation results are compared to real data to prove that the model is correct. Further analysis on simulation results point out the way to achieve an all-win game for power market members: generation companies improve their average load rates of the units by selling their electricity in the market, which makes units' cost drop and settlement price stay lower than benchmark price. Consequently electricity-demand provinces saved expenses, and units increase their profits. In conclusion, the trans-provincial electricity market of East China Power Grid is a successive case which improves the efficiency of the electricity industry by market-oriented measures.

China-Central Asia Power Cooperation Outlook

After analyzing the basic information,distribution of energy resources and condition of power industry in Central Asia,the high feasibility for China to cooperate closely with Central Asia in transnational power interconnection,power investment and technology exchanges,etc.is studied.Furthermore,the forms,mechanisms,existing problems and suggestions for the improvement of current policies related to the power cooperation are proposed.

Power BI在我院药品数据可视化中的应用

目的加强医院药品精细化管理,提升药师对药品的数据分析能力,实现数据分析自动化及查询功能,为集采药品、麻精药品的动态监管提供数据支撑。方法使用数据可视化工具Power BI搭建服务,制作报表,能够查询药品使用情况和对比情况,实现各科室药品使用情况的可视化管理。结果通过该软件,药师可以精确查询任意时间维度下药品的使用数量、金额等情况,实现数据分析自动化。结论借助数据管理工具能够帮助药师提升数据分析能力和工作效率,有助于加强医院药品的精细化管控。

运用品管圈降低Power PICC堵管率的实践

目的 :探讨开展品管圈活动对降低Power PICC(耐高压注射型经外周置入的中心静脉导管)带管患者堵管率的有效性。方法:在实施品管圈前的2014年5-6月随机选取278例Power PICC带管患者及在实施品管圈后的2014年11-12月随机选取251例Power PICC带管患者,其中5-6月的278例患者采取常规导管护理模式,11-12月的251例患者运用品管圈管理Power PICC带管患者,包括分析患者堵管的原因,设定目标,制定相应的对策及实施,观察分析品管圈活动前后堵管率情况。结果:对Power PICC带管患者进行品管圈干预后,患者的堵管率由28.4%降低至12.0%,差异有统计学意义(P<0.05)。结论 :开展品管圈活动可以降低Power PICC带管患者的堵管率,保护了患者血管通路。

Power PICC在重症急性胰腺炎中的应用及其护理

目的探讨耐高压外周穿刺中心静脉导管(Power PICC)作为一种新型的血管通路在重症急性胰腺炎(SAP)治疗中的应用及其护理。方法回顾性分析18例SAP患者的临床资料,其中8例行Power PICC,其余10例行中心静脉置管(CVC),比较2组患者在导管相关并发症及留置时间方面的差异。结果 Power PICC组导管平均留置时间为49.5 d,并发症发生率仅为10%;CVC组导管平均留置时间为25.4 d,并发症发生率为30%,且出现导管堵塞、导管相关性感染等严重并发症。在导管相关并发症及留置时间方面,Power PICC组均优于CVC组。结论 Power PICC是SAP治疗过程中血管通路的理想选择。

Power BI软件在国家集采药品使用数据分析和管理方面的应用

目的通过对医院中国家集中采购药品的使用数据进行分析,为医院管理者制定临床用药管控策略提供支持。方法采用Power BI软件,对医院中国家集中采购药品使用数据进行多维度和个性化的分析,并进行可视化展示,挖掘和发现该类药品临床使用和管理中存在的关键问题,供决策者使用。结果医院管理者借助Power BI软件的可视化图表,可以快速有效地发现问题、做出决策,稳步推进国家集中采购药品的使用。结论基于Power BI的数据分析和可视化展示,可以为医院推进国家集中采购药品使用提供重要支撑。

Cascading Failures in Power Grids: A Load Capacity Model with Node Centrality

Power grids,due to their lack of network redundancy and structural interdependence,are particularly vulnerable to cascading failures,a phenomenon where a few failed nodes—having their loads exceeding their capacities—can trigger a widespread collapse of all nodes.Here,we extend the cascading failure(Motter-Lai)model to a more realistic perspective,where each node’s load capacity is determined to be nonlinearly correlated with the node’s centrality.Our analysis encompasses a range of synthetic networks featuring small-world or scale-free properties,as well as real-world network configurations like the IEEE bus systems and the US power grid.We find that fine-tuning this nonlinear relationship can significantly enhance a network’s robustness against cascading failures when the network nodes are under attack.Additionally,the selection of initial nodes and the attack strategies also impact overall network robustness.Our findings offer valuable insights for improving the safety and resilience of power grids,bringing us closer to understanding cascading failures in a more realistic context.

基于Power BI软件对集采药品的智能监测与管理

目的提高国家组织药品集中采购、省际联盟带量采购药品(简称集采药品)工作监控管理的智能化水平。方法基于Power BI软件开发可视化智能监控工具,获取并整理数据,运用M函数与度量值对数据建模分析,添加视觉对象生成交互式可视化报表。结果基于Power BI软件自主设计集采药品智能监控系统实现了以集采药品为业务场景的多维分析,可快速获取集采药品的合同量完成情况、中选与非中选药品采购量占比、采购金额占比等重要指标。结论Power BI软件可为医院集采药品的管理提供强大的技术支持,并可实现数据使用规范化、统计分析智能化、数据呈现可视化。

基于Power BI的国家集中采购药品精细化管理平台构建

目的基于Power BI构建国家集中采购(集采)药品精细化管理平台,实现高效自动化数据分析,助力国家药品集采政策实施。方法利用Power BI软件构建信息化管理模板,并导入国家集采药品数据进行分析,最终呈现可视化的数据分析画布。结果基于Power BI构建的国家集采药品精细化管理平台能够提供标准化、同质化、可视化分析视图,显著提升国家集采药品全院任务量上报测算、科室任务量分配、全使用情况监测、完成情况分析等相关工作的效率。结论通过该国家集采药品精细化管理平台,实现高效便捷的国家集采药品数据可视化分析。

A novel decomposition and coordination algorithm for complex networks and its application to power grids

To analyze and control complex networks effectively, this paper puts forward a new kind of scheme, which takes control separately in each area and can achieve the network’s coordinated optimality. The proposed algorithm is made up of two parts: the first part decomposes the network into several independent areas based on community structure and decouples the information flow and control power among areas; the second part selects the center nodes from each area with the help of the control centrality index. As long as the status of center nodes is kept on a satisfactory level in each area, the whole system is under effective control. Finally, the algorithm is applied to power grids, and the simulations prove its effectiveness.

Making the World More Sustainable: Enabling Localized Energy Generation and Distribution on Decentralized Smart Grid Systems

Smart grid is an idea of upgradation of the traditional electric grid infrastructure. The efficiency of the existing electrical grid can be automated by integrating with innovative technical equipment such as:?high-tech forecasting system, digital sensors, advanced two-way communication and two-way power flow systems. Smart grid establishes an interface between utility and consumer which helps to use energy, based on the preferences of price, eco-friendly and without technical system issues. It empowers the grid to be more secure, reliable and efficient. The peer-reviewed articles and published government reports have been reviewed, based on the analysis of technical characteristics of power generation systems, eco-friendly sources of power generations, cost reduction, functionality and design of traditional grid versus smart grid. Furthermore, the innovative technologies that enable the grid to integrate with decentralized power generation system efficiently have been considered. This paper claims that in this modern era, it is arduous for traditional grid to fulfill the rising demand of electricity, along with sustainable, eco-friendly and stable power supply, as it cannot be efficiently integrated with decentralized and localized power generation systems and renewable energy sources. The result of this paper shows that decentralized and localized power generation systems are located close to end-users which decrease the transmission and supply cost of electricity. Innovative technologies allow the decentralized and localized power generation systems to be integrated with renewable energy sources which help to reduce the cost of utility services and provide clean energy. Moreover, technological advancement played a decisive role in enabling the electrical system to be more efficient. Electrical reliability can be improved,?greenhouse gas emissions can be reduced, renewable energy sources can efficiently be integrated,?and?rising demand for electricity can be met by embedding advanced applications and technological equipment in the electrical grid.

Generalized Trigonometric Power Sums Covering the Full Circle

The analytical calculation of the area moments of inertia used for special mechanical tests in materials science and further generalizations for moments of different orders and broader symmetry properties has led to a new type of trigonometric power sums. The corresponding generalized equations are presented, proven, and their characteristics discussed. Although the power sums have a basic form, their results have quite different properties, dependent on the values of the free parameters used. From these equations, a large variety of power reduction formulas can be derived. This is shown by some examples.

基于光储混合配置的级联H桥型光伏逆变器功率平衡策略

级联H桥(cascade H-bridge,CHB)变换器由于其模块化结构,已成为大规模光伏(photovoltaic,PV)并网逆变器的优选方案。然而,在不同光照强度和温度下,不同区域PV组件之间发电功率不同,导致CHB变换器相间输出功率不均衡、不稳定等问题。为此,文中提出一种基于CHB结构的光储混合电能路由,在三相CHB光伏逆变器中配置少量的储能模块,利用光储协同控制,维持CHB内部功率稳定,消除分布式PV在相间产生的不均衡功率,且变换器输出功率能够时刻满足网侧上层功率调度,提高了光伏电站的稳定性。针对系统安全区域,在载波移相调制策略下,全桥子模块传输的功率受到约束,并对光伏和储能模块的配置作详细分析。最后,通过仿真以及实验验证所提拓扑及控制策略的正确性和有效性。

中原城市群文化软实力综合评价及空间分异研究

基于文化吸引力、文化展示力、文化传播力、文化创新力、文化事业投入力和文旅融合力6个维度构建文化软实力评价指标体系,运用空间分类、核密度分析、空间自相关等方法,分析中原城市群文化软实力的空间特征并解析其影响因素。结果表明:(1)从综合实力差异看,高、较高文化软实力城市数量少且主要分布在核心区,中等实力城市仅有3个,半数城市为低和较低实力。空间上具有明显的东西差异,西半壁呈现以郑汴为引领的中心外围格局,东半壁则表现为亳州、阜阳引领的极化特征,且在东西半壁之间形成聊城至驻马店的低值连绵带。(2)从分维度空间差异看,文化吸引力子系统、文化展示力子系统与综合实力格局类似,而文化事业投入力子系统呈现“西北高、东南低”的格局。此外,文化传播力子系统、文化创新力子系统呈现与前3个子系统完全不同的格局,表现为以郑汴为核心的低值包围高值的分布结构。(3)从空间集聚和关联看,中原城市群分别围绕郑州和亳州形成了“一主一副”的双核集聚态势,且主核区附近形成了显著的高-高集聚群。其中,文化吸引力子系统与综合实力的集聚格局基本一致,文化展示力子系统的集聚在郑州减弱而在亳州得到加强,文化传播力子系统和文化创新力子系统仅在中部形成集聚核心,文旅融合力子系统则在综合格局的基础上在东南部形成两个集聚核心。(4)从影响因素看,市区GDP对城市文化软实力的影响最强,第三产业增加值次之,交通设施、科教文卫单位数和城镇化率的影响作用不明显。

论地方性法规的空间效力

地方性法规的空间效力是指地方性法规在什么空间范围内具有法律效力。地方性法规的空间效力可以分为“整体效力”“局部效力”“特定效力”和“区外效力”四种形式,其中“区外效力”是地方性法规的空间效力最鲜明的效力特征。我国现行宪法、立法法和有关法律并没有确立地方性法规的一般性空间效力,只是对“局部效力”和“特定效力”在制度上加以明确,对于地方性法规在“本行政区域”之外是否具有法律效力没有作出禁止性规定。从经济特区法规、自治条例和单行条例的立法程序来看,都不能作出否定地方性法规所具有的“区外效力”的结论。地方性法规的“区外效力”在横向和纵向两个方面进行效力延伸,横向空间效力是指地方性法规在其他行政区域的法律效力,纵向空间效力是指地方性法规能否约束中央层面的执法和司法审判机构。根据中国法的“域外适用”理论和政策要求,在确保地方性法规的合宪性、合法性前提下,地方性法规的“区外效力”应当得到制度的肯定和支持。

简政放权何以影响企业创新?

简政放权是否可以释放改革红利,是全社会普遍关注的重大问题。基于简政放权的政策内涵与中国政治话语的统计语义学方法,选取中央政府会议公告为文本研究对象,利用爬虫分析技术构建了简政放权指标,研究企业创新是否因简政放权而产生明显的促进效果。实证结果显示,中央政府通过引导创新环境、精简政府办事程序和降低企业负担等三方面发力,促进企业研发资金规模扩大和研发人员数量增加,有效提升企业的专利规模和专利质量。进一步的机制分析发现,地方政府有效执行简政放权政策,改善企业经营环境,将会间接带动企业创新。异质性检验发现,简政放权的政策效果受企业注册地的行政层级和企业自身的行政级别影响,级别越高,简政放权对创新的促进效果越显著。下一步,应针对性推进简政放权政策,加大对薄弱环节的支持力度,确保政策在地方政府的落地执行,激发企业创新活力。