Dynamic character analysis for the arc welding power source based on fuzzy logic

A lot of experimental methods have been brought forth to assess the dynamic character of the arc welding power source, but up to now, this issue has not been solved very well. In this paper, based on the fuzzy logic reasoning method, a dynamic character assessing model for the arc welding power source was established and used to analyze the dynamic character of the welding power source. Three different types of welding machine have been tested, and the characteristic information of the electrical signals such as re-striking arc voltage, low welding current and so on of the welding process were extracted accurately by using a self-developed welding dynamic arc wavelet analyzer. The experimental results indicate that this model can be used as a new assessing method for the dynamic character of the arc welding power source.

Fuzzy Logic Controller Implementation of Power Quality Improvement Using UPQC

This paper presents a gross examination about Unified Power Quality Conditioner (UPQC) to invigorate the power issues at the distribution level of the electrical system. Nowadays power electronics research has added the importance of power quality studies, for concrete illustration, Custom Power Devices (CPD) and Flexible AC Transmission position (FACTS) devices. The approach offered in this paper utilizes the series and shunt compensator of Unified Power Quality Conditioner (UPQC) to inject a compensation voltage in-phase with the source current over voltage fluctuations. The execution of two structures of UPQC, left-shunt (L-UPQC) and right-shunt (R-UPQC) are investigated under diverse operating conditions based on the fuzzy logic controller to raise the value of power quality of a single feeder distribution system by MATLAB/Simulink programming. Various power quality issues have been analyzed in this study. Finally, the right shunt UPQC is outperformed in this proposed power system.

Small Signal Stability Analysis of DFIG Fed Wind Power System Using a Robust Fuzzy Logic Controller

This paper focuses on the small signal stability analysis of Doubly-Fed Induction Generator (DFIG) fed wind power system under three modes of operation. The system stability is affected by the influence of electromechanical oscillations, which can be damped using Power System Stabilizer (PSS). A detailed modeling of DFIG fed wind system including controller has been carried out. The damping controller is designed using fuzzy logic to damp the oscillatory modes for stability. The robust performance of the system with controllers has been evaluated using eigen value analysis and time domain simulations under various disturbances and wind speeds. The effectiveness of the proposed fuzzy based PSS is compared with the performance of conventional PSS implemented in the wind system.

Maximum Power Point Tracking Using Fuzzy Logic Controller under Partial Conditions

This study proposes a fuzzy system for tracking the maximum power point of a PV system for solar panel. The solar panel and maximum power point tracker have been modeled using MATLAB/Simulink. A simulation model consists of PV panel, boost converter, and maximum power point tack MPPT algorithm is developed. Three different conditions are simulated: 1) Uniform irradiation;2) Sudden changing;3) Partial shading. Results showed that fuzzy controller successfully find MPP for all different weather conditions studied. FLC has excellent ability to track MPP in less than 0.01 second when PV is subjected to sudden changes and partial shading in irradiation.

Logic Picture-Based Dynamic Power Estimation for Unit Gate-Delay Model CMOS Circuits

In this research, a fast methodology to calculate the exact value of the average dynamic power consumption for CMOS combinational logic circuits is developed. The delay model used is the unit-delay model where all gates have the same propagation delay. The main advantages of this method over other techniques are its accuracy, as it is deterministic and it requires less computational effort compared to exhaustive simulation approaches. The methodology uses the Logic Pictures concept for obtaining the nodes’ toggle rates. The proposed method is applied to well-known circuits and the results are compared to exhaustive simulation and Monte Carlosimulation methods.

Hierarchical Coordinated Control for Power System Voltage Using Linear Temporal Logic

The paper proposed an approach to study the power system voltage coordinated control using Linear Temporal Logic (LTL). First, the hybrid Automata model for power system voltage control was given, and a hierarchical coordinated voltage control framework was described in detail. In the hierarchical control structure, the high layer is the coordinated layer for global voltage control, and the low layer is the power system controlled. Then, the paper introduced the LTL language, its specification formula and basic method for control. In the high layer, global voltage coordinated control specification was defined by LTL specification formula. In order to implement system voltage coordinated control, the LTL specification formula was transformed into hybrid Automata model by the proposed algorithms. The hybrid Automata in high layer could coordinate the different distributed voltage controller, and have constituted a closed loop global voltage control system satisfied the LTL specification formula. Finally, a simple example of power system voltage control include the OLTC controller, the switched capacitor controller and the under-voltage shedding load controller was given for simulating analysis and verification by the proposed approach for power system coordinated voltage control. The results of simulation showed that the proposed method in the paper is feasible.

一种有效的低功耗扫描测试结构——PowerCut

扫描测试是超大规模集成电路测试中最常用的一种技术.但在扫描测试过程中,扫描单元的频繁翻转会引起电路中过大的测试功耗,这对电路测试提出了新的挑战.提出了一种新颖的低功耗全扫描结构——PowerCut,通过对扫描链的修改,加入阻隔逻辑,有效降低扫描移位过程中的动态功耗,同时加入控制单元,使电路在扫描移位过程时进入低漏电流状态,降低了电路的静态功耗.实验表明该结构在较小的硬件开销范围内有效地减小了扫描测试功耗.

基于PowerDesigner的家庭财务管理系统的数据库设计

该文介绍了基于Power Designer的家庭财务管理系统数据库建模的过程。通过对系统的需求和功能以及数据流程进行分析,设计系统所需数据项和数据结构。在数据库分析的基础上设计系统的实体和关系并使用Power Designer工具建立概念数据模型,逻辑数据模型。根据关系模式以及转换规则得到数据库模式。

逻辑参数库中Power参数的提取

本文介绍了在LPE这个逻辑参数(电学参数)自动提取工具里,Power参数的定义以及提取Power的输入激励波形的生成算法。对于不同的RelatedPin以及电路的反馈特性需要不同的激励波形生成算法。

Low Power Computing Paradigms Based on Emerging Non-Volatile Nanodevices

Traditional digital processing approaches are based on semiconductor transistors, which suffer from high power consumption, aggravating with technology node scaling. To solve definitively this problem, a number of emerging non-volatile nanodevices are under intense investigations. Meanwhile, novel computing circuits are invented to dig the full potential of the nanodevices. The combination of non-volatile nanodevices with suitable computing paradigms have many merits compared with the complementary metal-oxide-semiconductor transistor （CMOS） technology based structures, such as zero standby power, ultra-high density, non-volatility, and acceptable access speed. In this paper, we overview and compare the computing paradigms based on the emerging nanodevices towards ultra-low dissipation.

Control strategy for hybrid tracked vehicles using fuzzy logic

To solve the problem of power distribution for hybrid tracked vehicles （HTV）, a supervi- sory control strategy is proposed. Firstly, power system integration is analyzed and modeled. Then the control algorithm is given. Two fuzzy logics are used to realize the coordination control over each power unit. One controls power distribution based on the load power and battery state of charge （SOC）. The other manage the power during regenerating braking. To validate the presented control strategy, a ＂driver and controller＂ in the loop simulation platform is built based on dSPACE system and real-time simulation is made. The simulation results show that the strategy presented can solve the power distribution problem of hybrid tracked vehicles correctly and effectively.

Neuro-Fuzzy Based Interline Power Flow Controller for Real Time Power Flow Control in Multiline Power System

This article investigates the power quality enhancement in power system using one of the most famous series converter based FACTS controller like IPFC (Interline Power Flow Controller) in Power Injection Model (PIM). The parameters of PIM are derived with help of the Newton-Raphson power flow algorithm. In general, a sample test power system without FACTs devices has generated more reactive power, decreased real power, more harmonics, small power factor and poor dynamic performance under line and load variations. In order to improve the real power, compensating the reactive power, proficient power factor and excellent load voltage regulation in the sample test power system, an IPFC is designed. The D-Q technique is utilized here to derive the reference current of the converter and its D.C link capacitor voltage is regulated. Also, the reference voltage of the inverter is arrived by park transformation technique and its load voltage is controlled. Here, a sample 230 KV test power system is taken for study. Further as the conventional PI controllers are designed at one nominal operating point they are not competent to respond satisfactorily in dynamic operating conditions. This can be circumvented by a Fuzzy and Neural network based IPFC and its detailed Simulink model is developed using MATLAB and the overall performance analysis is carried out under different operating state of affairs.

基于Zelio Logic的双电源加母联无线远程控制方案

基于施耐德Zelio logic逻辑控制器,给出了详细的双电源加母联应用方案。

尹锡悦政府“对美追随”的权力逻辑——基于关系理论

韩国长期扮演权力受者,让其误认为不安全的最大根源是自身力量相对周边大国薄弱。冷战后,韩国不仅内化了中等强国身份,而且借助周边大国的力量,在保障自身安全的同时积累权力资源、发挥影响力。中等强国身份要求韩国预测外部压力并加以适应。尹锡悦政府将“全球枢纽国家”“全球战略同盟关系”作为韩国对外政策的总体目标和优先目标,是预测外部压力加以适应的体现。在关系理论视角下,韩美之间已经建立起权力交换的“人情”机制,“回报”规范要求韩国满足美国对华战略竞争的需求。通过权力交换机制,韩国不仅从个体、结构、关系三个层面获得权力资源,而且加入美国建立的“小多边”也为其提供了发挥影响力的平台。

SYNCHRONOUS DERIVED CLOCK AND SYNTHESIS OF LOW POWER SEQUENTIAL CIRCUITS

Based on analyzing significance of controlling clock in design of low power sequential circuits, this paper proposes a technique that the gating signal is derived from the master latch in a flip-flop to make the derived clock having no glitch and no skew. The design of a decimal counter with half-frequency division shows that by using the synchronous derived clock the counter has lower power dissipation as well as simpler combinational logic. Computer simulation shows 20% power saving.

资本主义政治文明形态话语逻辑的解析、批判与超越

政治文明形态是人类文明形态的重要组成部分,是特定政治文明结构与发展水平的系统性呈现。作为政治文明核心的政治权力是理解政治文明形态的钥匙。权力来源、授权形式、权力结构和运行方式是政治权力系统的基本话语构成,以此为视角,社会契约、选举授权、分权制衡与资本主义民主法治的“契约型”话语逻辑构成资本主义政治文明形态基本理论叙事。理论上的契约权遮蔽事实上的资本权、周期性选举积弊、分权制衡治理低效、资本主义民主法治内生缺陷等,导致资本主义政治文明形态实践面临诸多困境。超越资本主义政治文明话语逻辑的理论叙事是建构技术权、双向授权与整合性权力相统一的话语逻辑。

Design of Compact Baugh-Wooley Multiplier Using Reversible Logic

In today’s digital era, developing digital circuits is bounded by the research towards investigating various nano devices. This paper provides the design of compact Baugh-Wooley multiplier using reversible logic. Even though various researches have been done for designing reversible multiplier, this work is the first in the literature to use Baugh-Wooley algorithm using reversible logic. In this work, a new 5 × 5 reversible multiplier cell is proposed which will be useful in designing Baugh-Wooley multiplier. The proposed single multiplier cell is able to perform addition of a 1 × 1 product with the sum and carry from the previous cell. This reversible multiplier cell is useful in building up regularity in the array multipliers. The Toffoli gate synthesis of the proposed reversible multiplier cell is also given.

加快建设教育强国的语境分析与战略推进

新形势下,加快建设教育强国,要明确当前教育发展的战略语境,找准教育发展的现实起点,回应教育发展的主要矛盾,在战略上主动、在效果上现实地服务全面建设社会主义现代化国家的目标指向。要从多端多维加快建设教育强国,建设教育事业强国、教育服务强国、教育投入强国、教育治理强国、教育学术强国、教育生态强国。要明确加快建设教育强国的推进逻辑,坚持建设教育强国“双优先”的战略定位,同步提高教育投入水平与办学效率,高度重视教育的溢出效应与办学主体的激励相容,科学布局各级教育发展主导任务的价值位序,充分释放人人成才教育与英才教育的发展红利。

“六个必须坚持”引领体育高质量发展:逻辑理路与实践创新

作为习近平新时代中国特色社会主义思想的精髓和活的灵魂,“六个必须坚持”是开辟马克思主义中国化时代化新境界必须坚持好、运用好的立场、观点和方法。运用文献资料、逻辑分析等研究方法,深刻理解“六个必须坚持”的内涵,把握其与体育高质量发展的紧密逻辑关系。人民至上是价值取向,自信自立是基本立足点,守正创新是原则方向,问题导向是主要着力点,系统观念是思想方法,胸怀天下是胸襟视野。以“六个必须坚持”为引领,新征程奋力推动体育高质量发展,需要坚持人民至上的根本立场,满足人民日益增长的多元体育需求;展现自信自立的精神特质,推进中国式现代化体育发展行稳致远;弘扬守正创新的理论品格,压茬拓展体育改革创新的广度和深度;落实问题导向的实践要求,解决体育重点领域关键环节的突出问题;遵循系统观念的思想方法,促进体育全方位系统协同融合发展;彰显胸怀天下的世界情怀,建立更高水平的体育对外开放新格局。

教育数字化推动教育强国建设的功能逻辑与实践进路

教育与数字技术的融合引领了未来教育发展的新趋势,为人类教育带来更广阔的发展空间和美好愿景。在教育强国建设过程中,教育数字化展现出其独特的技术优势,它既是推动教育强国建设的重要基础和动能引擎,又能为教育强国建设提供根本保障。借助教育数字化的力量,形塑教育要素新样态、助推数字教育模式革新、赋能教育多元体系构建、促进数字教育生态重塑以及扩大数字教育国际影响力,是教育数字化赋能教育强国建设功能演进的内在逻辑。教育数字化有效推动教育强国建设,需要聚焦拔尖创新人才培养,提高教育数字化对教育强国建设的贡献指数;矫正主体认知抵牾,加强教育数字化对教育强国建设的多方协作;增强教育深层变革,释放教育数字化对教育强国建设的巨大潜能;创新教育技术体系,响应教育数字化对教育强国建设的内生需求;健全数字教育制度,保障教育数字化对教育强国建设的持续赋能,从而充分发挥教育数字化重要突破口的作用,整体推进教育高质量发展,助力教育强国建设。