An Elite-Class Teaching-Learning-Based Optimization for Reentrant Hybrid Flow Shop Scheduling with Bottleneck Stage

Bottleneck stage and reentrance often exist in real-life manufacturing processes;however,the previous research rarely addresses these two processing conditions in a scheduling problem.In this study,a reentrant hybrid flow shop scheduling problem(RHFSP)with a bottleneck stage is considered,and an elite-class teaching-learning-based optimization(ETLBO)algorithm is proposed to minimize maximum completion time.To produce high-quality solutions,teachers are divided into formal ones and substitute ones,and multiple classes are formed.The teacher phase is composed of teacher competition and teacher teaching.The learner phase is replaced with a reinforcement search of the elite class.Adaptive adjustment on teachers and classes is established based on class quality,which is determined by the number of elite solutions in class.Numerous experimental results demonstrate the effectiveness of new strategies,and ETLBO has a significant advantage in solving the considered RHFSP.

Selective liquid directional steering enabled by dual-scale reentrant ratchets

Achieving well-controlled directional steering of liquids is of great significance for both fundamental study and practical applications, such as microfluidics, biomedicine, and heat management. Recent advances allow liquids with different surface tensions to select their spreading directions on a same surface composed of macro ratchets with dual reentrant curvatures. Nevertheless, such intriguing directional steering function relies on 3D printed sophisticated structures and additional polishing process to eliminate the inevitable microgrooves-like surface deficiency generated from printing process, which increases the manufacturing complexity and severally hinders practical applications. Herein, we developed a simplified dual-scale structure that enables directional liquid steering via a straightforward 3D printing process without the need of any physical and chemical post-treatment. The dual-scale structure consists of macroscale tilt ratchet equipped with a reentrant tip and microscale grooves that decorated on the whole surface along a specific orientation. Distinct from conventional design requiring the elimination of microgrooves-like surface deficiency, we demonstrated that the microgrooves of dual-scale structure play a key role in delaying or promoting the local flow of liquids, tuning of which could even enable liquids select different spreading pathways. This study provides a new insight for developing surfaces with tunable multi-scale structures, and also advances our fundamental understanding of the interaction between liquid spreading dynamics and surface topography.

Geometric Study of Two-Dimension Stellated Reentrant Auxetic Structures to Transformable Architecture

Transformable architecture is totally linked to the study and knowledge of geometry.There are some materials in nature,whose geometric invariants establish equivalent structural behavior regarding the scalar transformations,developing different spatial typologies according to dimensional variation.Auxetic materials are characterized by their negative Poisson’s ratio.They can change their geometric configuration from a line to a surface,and from a surface to a volume or spatial framework.This paper is based on establishing and comparing those stellated reentrant auxetic geometries to be able to build new spaces defined by their capacity for architectural transformation,studying analytically geometric properties of stellated reentrant auxetic structures that,from the molecular to the macroscopic level,can be part of the architecture construction.In this investigation,a comparative study by means of CAD of stellated reentrant auxetic patterns has been realized.A Computer-Aided Design study of stellated reentrant auxetic structures will be realized to use them in architecture.The geometric behavior of the different stellated reentrant auxetic patterns is analyzed from the developed study to generate a systematic comparison,evaluating properties of these forms,such as their maximum achievable area reductions in relation to the total length of bars of the structure,in order to obtain a growth factor.

Analysis of the geometrical dependence of auxetic behavior in reentrant structures by finite elements

Materials with a negative Poisson＇s ratio（PR）are called auxetics;they are characterized by expansion/contraction when tensioned/compressed.Given this counterintuitive behavior,they present very particular characteristics and mechanical behavior.Geometrical models have been developed to justify and artificiall reproduce such materials＇ auxetic behavior.The focus of this study is the exploration of a reentrant model by analyzing the variation in the PR of reentrant structures as a function of geometrical and base material parameters.It is shown that,even in the presence of protruding ribs,there may not be auxetic behavior,and this depends on the geometry of each reentrant structure.Values determined for these parameters can be helpful as approximate reference data in the design and fabrication of auxetic lattices using reentrant geometries.

Clinical Study on the Treatment of 325 Cases of Atrioventricular Node Reentrant Tachycardia by Radiofrequency Catheter Ablation

In order to improve the efficacy of modified inferior method or middle method of radiofrequency catheter ablation (RFCA) in the treatment of atrioventricular node reentrant tachycardia (AVNRT), the clinical data of 325 cases of AVNRT from March 1992 to Feb. 2000 being subjected to the treatment of RFCA were retrospectively analyzed. The results showed that the successful rate was increased and recurrence was decreased year by year. In the recent 4 years the effective rate was up to 100 %. The complication of three grade of AVB occurred in 3 % and recurrent rate in 9.1 % before March 1996, but both of them were zero in the last 3 years. The time of RFCA procedure and X ray exposure was significantly reduced. It was concluded that ablating more than 3 targets by modified inferior method or middle method with energy titrating and strict endpoint was the crux of obtaining satisfactory therapeutic effects and preventing recurrence.

Pressure-Induced Charge-Order Melting and Reentrant Charge Carrier Localization in the Mixed-Valent Pb3Rh7O15

The mixed-valent Pb3Rh7O15 undergoes a Verwey-type transition at Tv≈180K, below which the development of Rh3＋3＋/Rh4＋4＋ charge order induces an abrupt conductor-to-insulator transition in resistivity. Here we investigate the effect of pressure on the Verwey-type transition of Pb3Rh7O15 by measuring its electrical resistivity under hydrostatic pressures up to 8GPa with a cubic anvil cell apparatus. We find that the application of high pressure can suppress the Verwey-type transition around 3GPa, above which a metallic state is realized at temperatures below ～70K, suggesting the melting of charge order by pressure. Interestingly, the low-temperature metallic region shrinks gradually upon further increasing pressure and disappears completely at P〉7GPa, which indicates that the charge carriers in Pb3Rh7O15 undergo a reentrant localization under higher pressures. We have constructed a temperature-pressure phase diagram for Pb3Rh7O15 and compared to that of Fe3O4, showing an archetype Verwey transition.

Highly Robust Reentrant Superconductivity in CsV_3Sb_5 under Pressure

We present the superconducting(SC) property and high-robustness of structural stability of kagome CsV_3Sb_5 under in situ high pressures.For the initial SC-I phase,its T_c is quickly enhanced from 3.5 K to 7.6 K and then totally suppressed at P-10 GPa.With further increasing pressure,an SC-Ⅱ phase emerges at P-15 GPa and persists up to 100 GPa.The T_c rapidly increases to the maximal value of 5.2 K at P=53.6 GPa and slowly decreases to 4.7 K at P=100 GPa.A two-dome-like variation of T_c in CsV_3Sb_5 is concluded here.The Raman measurements demonstrate that weakening of E_(2g) mode and strengthening of E_(1g) mode occur without phase transition in the SC-II phase,which is supported by the results of phonon spectra calculations.Electronic structure calculations reveal that exertion of pressure may bridge the gap of topological surface nontrivial states near E_F,i.e.,disappearance of Z2 invariant.Meanwhile,the Fermi surface enlarges significantly,consistent with the increased carrier density.The findings here suggest that the change of electronic structure and strengthened electron-phonon coupling should be responsible for the pressure-induced reentrant SC.

Numerical Study of the Transition Between Reentrant Jet and Twin Vortex Flow Regimes in Ventilated Cavitation

Contrary to natural cavitation,ventilated cavitation is controllable and is not harmful.It is particularly used to reduce the drag of the hydraulic vehicles.The ventilated cavitation is characterized by various gas regimes.The mechanisms of ventilated cavitation are investigated in the present work with CFD based on a 2D solver.The attention is especially focused on the transition between the reentrant jet and twin vortex regimes.The results confirmthat the product of ventilated cavitation number and Froude number is lower than 1(σcFr<1)in the twin vortex regime,while it is higher than 1(σcFr>1)in the reentrant jet regime,as reported in the literature.Further analysis shows that ventilated cavitation is significantly influenced by the natural cavitation number.

DEVELOPMENT OF REENTRANT TWO WAY ROTARY JOINT

A novel two-way rotary joint (S and P band) is described. For S band rotary joint,VSWR is less than 1.2 over the frequency range from 1.2GHz to 4.4GHz. For P band rotary joint,the structure of the reentrant resonator is used to reduce the length of the rotary joint to aboutλ/4, and the special and small size requirement is satisfied.

Value of the adenosine test for diagnosis of dual AV nodal physiology in patients with AV nodal reentrant tachycardia

Objectives: This study was aimed at assessing the value of the adenosine test for noninvasive diagnosis of dual AV nodal physiology(DAVNP) in patients with AV nodal reentrant tachycardia (AVNRT). Methods: 53 patients with paroxysmal supraventricular tachycardia (PSVT) were given incremental doses of adenosine intravenously during sinus rhythm before electrophysiological study. The adenosine test was repeated on a subset of 18 patients with AVNRT after radiofrequency catheter ablation. Results: Sudden increments of PR interval of more than 60 msec between two consecutive beats were observed in 26(83.9%) of 31 patients with typical AVNRT and 2 (9.1%) of 22 patients with AVRT and AT ( P <0.01). The maximal PR increment between 2 consecutive beats in the AVNRT group(105±45ms) was significantly greater than that in the AVRT and AT group (20±13ms) ( P <0.01).In postablation adenosine test, DAVNP was eliminated in all 8 patients who underwent slow pathway abolition that EPS showed the slow pathway disappeared and 4 of 10 patients who underwent slow pathway modification that EPS showed the slow pathway persisted. Six of 10 patients who exhibited persistent duality showed a marked reduction in the number of beats conducted in the slow pathway after adenosine injection( P <0.01).Conclusions: Administration of adenosine during sinus rhythm may be a useful bedside test for diagnosis of DAVNP in high percentage of patients with typical AVNRT and additionally for evaluating the effects of radiofrequency ablation.

On the Strong Approximation for a Simple Reentrant Line in Light Traffic Under First-buffer First-served Service Discipline

For a 2-station and 3-class reentrant line under first-buffer first-served(FBFS)service discipline in light traffic,we firstly construct the strong approximations for performance measures including the queue length,workload,busy time and idle time processes.Based on the obtained strong approximations,we use a strong approximation method to find all the law of the iterated logarithms(LILs)for the above four performance measures,which are expressed as some functions of system parameters:means and variances of interarrival and service times,and characterize the fluctuations around their fluid approximations.

可重入生产系统的平均报酬型强化学习调度

在可重入生产系统中 ,一个重要的问题就是对调度策略进行优化 ,以提高系统平均输出率 .本文采用了一种平均报酬型强化学习算法来解决该问题 ,直接从所关心的系统品质出发 ,自动获得具有自适应性的动态调度策略 .仿真结果表明 ,其性能优于两种熟知的优先权调度策略 .

一种增强Linux实时性能的技术

在对Linux核心进行分析的基础上 ,深入研究了Linux操作系统的不可切换性和实时信号的延迟性 。

微波梳状线带通滤波器脉冲功率容量的研究

在脉冲相位键控 (PPK)再入遥测系统中 ,除了传输常规遥测信号外 ,还要传输特种遥测信号 ,即单次宽脉冲信号。文中介绍了能满足该系统要求的端接在发射设备后的微波梳状线带通滤波器有关技术、原理、结构特征和设计方法 。

基于PN的可重入医学检测调度系统优化研究

基于一类具有可重入特点的医学检测过程的设备调度问题,研究了具有约束条件的优化解.首先分析了调度约束条件和优化目标,建立了其Petri Networks(PN)形式化模型,并分析了其规则调度系统的稳定性和其他性能.然后利用PN模型和调度约束条件解出调度可行解结合对医学检测部分工序要求连续的基础上建立时间约束矩阵,对可行解进一步优化,最终得到满足所有约束条件的优化可行解.通过对实际医学检测系统的实例分析和CPN Tools仿真,结果表明所建立的模型和方法的有效性.

基于MC9328MX1的可重入中断技术研究

在嵌入式系统中,实时性是一个普遍的要求。在嵌入式多任务系统中,实时性要求高的任务一般都通过中断来实现,并且高优先级中断应能打断低优先级中断的执行。文章基于MC9328MX1,设计了一个可重入的中断系统。

基于蚁群算法的半导体生产线调度方法研究

为了解决具有可重入特性的半导体生产线调度问题,提出基于蚁群算法的半导体生产线调度模型(ASWFSM)。在模型中,利用图论的方法把调度方案的寻优过程转换为蚂蚁对有向图的搜索,并且,引入专家系统作为推理机避免了寻优过程中对可行节点判断的复杂性。仿真试验证明,此模型具有良好的调度效果和稳定性。

用Labview进行并行多任务编程

本文主要介绍了在Labview中进行并行多任务编程的基本概念及实现技术,包括协作式多任务、抢占式多任务、线程、Labview执行系统及并行任务之间的同步;同时作者详细地介绍了这些技术在一个监测软件中的具体应用。

EnSite NavX三维标测系统引导射频消融治疗房室折返性心动过速的应用研究

目的:评价EnSite NavX三维标测系统引导下应用导管射频消融治疗房室折返性心动过速(atrioventricular reentrant tachycardia,AVRT)的效率及优势。方法:选择2012年3月至2015年6月经食管调搏提示逆行P’波呈偏心性传导的拟诊AVRT患者91例。将入选患者随机分为研究组和常规组,研究组使用EnSite NavX三维标测系统(n=51),常规组使用常规X线曝光(n=40),两组进行心内电生理检查及消融,比较两组的手术操作时间、X线曝光时间、放电次数、放电时间、手术成功率。结果:与常规组相比,研究组手术时间显著缩短[(76.7±21.3)min对(93.2±28.5)min]、X线曝光时间显著缩短[(10.2±6.7)min对(17.3±8.3)min]、放电次数显著减少[(7±3)次对(15±8)次]、放电时间显著缩短[(6.7±2.3)min对(14.2±6.7)min],P<0.01。两组手术即时成功率无统计学差异。结论:EnSite NavX三维标测系统引导射频消融治疗AVRT可明显缩短X线曝光时间与手术时间,减少放电次数和时间。

EnSite NavX标测指导下与常规X线透视下射频消融房室结折返性心动过速的比较

目的探讨EnSite NavX标测指导下房室结折返性心动过速(AVNRT)射频消融术的可行性和安全性。方法 124例阵发性室上性心动过速的患者接受射频消融术被随机分为采用EnSite NavX系统标测指导组和常规透视组(X线)。结果 65例为AVNRT,其中标测指导组32例,常规透视组33例。所有手术均获得即刻的成功,无手术并发症。与常规透视组比较,标测指导组手术时间长(64.6±12.7 min vs 37.5±13.6 min,P<0.01);而X线透视时间少(27.62±31.5 s vs 324.2±108.3 s,P<0.01),其中有21例(65.6%)未接受X线透视。平均随访6个月均无心动过速复发。结论 EnSite NavX标测指导下AVNRT射频消融安全有效,且显著减少了X线透视时间。