Master/Slave结构下可保证边竞争QoS限制的资源分配策略

任务调度作为分布式系统中提高系统并发处理的关键一直受到很多关注,随着分布式系统规模的扩大以及分布式系统中所处理任务数的增多,这个NP问题很多只能依靠启发式搜索技术获得近似最优解,然而这些算法中大都忽略了分布式系统中的一些实际问题,如通信竞争问题。已有的关注通信竞争的理论要么不适用于多任务的实时分布式系统,要么最终的任务分配无法实现整体makespan值最小(min-max)。本文提出了一个以master/slave为支撑结构,以最小化系统整体响应时间为代价函数的算术模型MMP。MMP既考虑了通信竞争问题,也考虑了多任务事实分布式系统的特征:任务数量多,任务间相互独立,任务以一定频率到达,任务执行受QoS限制。

基于Master/Slave模式的CT同时代数重建的并行进程

Mastel/Slave模式,又称主从模式,是一种并行程序设计思想。本文介绍了同时代数重建法(SimultaneousAlgebraicReconstructionTechnique,SART),并简化、改进了该算法:讨论了SART算法的并行性和基于Master/Slave模式的并行进程:通过算法复杂度分析和在以客户/服务器((Cient/Serve)模式组建的局域网上的网络并行重建试验,证明了该并行进程能较大地提高SART算法的时间效率。

Achievement of chaotic synchronization trajectories of master-slave manipulators with feedback control strategy

This paper addresses a master-slave synchro- nization strategy for complex dynamic systems based on feedback control. This strategy is applied to 3-DOF pla- nar manipulators in order to obtain synchronization in such complicated as chaotic motions of end-effectors. A chaotic curve is selected from Duffing equation as the trajectory of master end-effector and a piecewise approximation method is proposed to accurately represent this chaotic trajectory of end-effectors. The dynamical equations of master-slave manipulators with synchronization controller are derived, and the Lyapunov stability theory is used to determine the stability of this controlled synchronization system. In numer- ical experiments, the synchronous motions of end-effectors as well as three joint angles and torques of master-slave manipulators are studied under the control of the proposed synchronization strategy. It is found that the positive gain matrix affects the implementation of synchronization con- trol strategy. This synchronization control strategy proves the synchronization＇s feasibility and controllability for com- plicated motions generated by master-slave manipulators.

Exponential networked synchronization of master-slave chaotic systems with timevarying communication topologies

The networked synchronization problem of a class of master-slave chaotic systems with time-varying communication topologies is investigated in this paper. Based on algebraic graph theory and matrix theory, a simple linear state feedback controller is designed to synchronize the master chaotic system and the slave chaotic systems with a time- varying communication topology connection. The exponential stability of the closed-loop networked synchronization error system is guaranteed by applying Lyapunov stability theory. The derived novel criteria are in the form of linear matrix inequalities （LMIs）, which are easy to examine and tremendously reduce the computation burden from the feedback matrices. This paper provides an alternative networked secure communication scheme which can be extended conveniently. An illustrative example is given to demonstrate the effectiveness of the proposed networked synchronization method.

Master-slave robot force telepresence technology

In order to make the manipulators useful, some force feedback is required to enable the operator to sense the robot’s feelings. Without force feedback, many tasks will not be able to be carried out. For these reasons, a master slave system with different kinematics has been developed. The system permits us to vary the ratio of the position/attitude, to design a master manipulator without considering the kinematics of the slave manipulator, and so on. To overcome the difficulties, a master slave manipulator system with different kinematics is proposed. The master manipulator is force controlled via a force torque sensor in the handle. As to master slave manipulator system with two way force feedback is concerned, the force goes to the actuator from the operator, and come back to the operator from the actuator. The working situation is viewed by the stereo TV supervisory system. The force and vision telepresence are thus achieved. In order to ensure the maneuverability, direct drive DC motors and PWM servo units are adopted to improve the response speed. It can provide force response in a wide range. A lot of experiments were performed with the master slave manipulator system force telepresence to study the force response under restricted environment. By two force sensors, the force position bilateral force response system effectively decreases the affection of friction and inertia force, and increases the authenticity of bilateral force response. When the slave manipulator arm is encountered with soft object(sponge), in the experiments, the operator can clearly have the fine feeling as if he himself is contacted with the object.

Research on A Master - slave Multi - microcomputers Control System for Hollow Spindle Fancy Yarn Spinning Machine

In this paper, a successfully studied and developed master - slave muld - microcomputers control system based on PC - BUS for hollow spindle fancy yarn spinning machine, mainly Its overall scheme, software and hardware construction, is introduced. Spinning experiments show that the system achieves satisfactory result. This system can solve the diftkultles of mechatronical fusion between domestic hollow splndk fancy yarn spuming muchine and its microcomputer control technology.

Power-combining based on master-slave injection-locking magnetron

A microwave power-combining system composed of two Panasonic 2M244-M1 magnetrons based on master–slave injection-locking is demonstrated in this paper. The principle of master–slave injection-locking and the locking condition are theoretical analyzed. Experimental results are consistent with the theoretical analysis and the experimental combined efficiency is higher than 96%. Compared with the external-injection-locked system, the power-combining based on the master–slave injection-locking magnetron is superior by taking out the external solid-state driver and the real-time phase control system. Thus, this power-combining system has great potential for obtaining a high efficiency, high stability, low cost, and high power microwave source.

Research on Master-slave Telerobot Force Telepresence Technology

A 3 DOF master-slave telerobot system is established for study on force telepresence technology. A force feedback and position control scheme is adopted in the bilateral force response control system,and force fidelity and controllability experiments demonstrate feasibility of the con-trol system.

Adaptive H_∞ Synchronization of Master-slave Systems with Mixed Time-varying Delays and Nonlinear Perturbations: An LMI Approach

This paper proposes an adaptive synchronization problem for the master and slave structure of linear systems with nonlinear perturbations and mixed time-varying delays comprising different discrete and distributed time delays. Using an appropriate Lyapunov-Krasovskii functional, some delay-dependent sufficient conditions and an adaptation law including the master-slave parame- ters are established for designing a delayed synchronization law in terms of linear matrix inequalities（LMIs）. The time-varying controller guarantees the H ∞ synchronization of the two coupled master and slave systems regardless of their initial states. Particularly, it is shown that the synchronization speed can be controlled by adjusting the updated gain of the synchronization signal. Two numerical examples are given to demonstrate the effectiveness of the method.

Tremor suppression in master-slave robot remote welding system

Welding seam tracking precision was decreased due to human hand tremor during the master-slave welding teleoperation. To solve this problem, a master-slave robot remote welding system was built, the system consisted of a master manipulator with six degree of freedom （ DOF ） , an industrial computer control system and a slave Motoman HP3 J robot, and human hand tremor and digital filtering were discussed. An optimal digital filter was designed to clean human tremor signal for improving the welding seam tracking precision. The experimental results show that the digital filter suppresses the operator＇ s tremor signal.

Hierarchical hybrid control network design based on LON and master-slave RS-422/485 protocol

Aiming at the weaknesses of LON bus, combining the coexistence of fieldbus and DCS (Distribu ted Control Systems) in control networks, the authors introduce a hierarchical hybrid control network design based on LON and master slave RS 422/485 protocol. This design adopts LON as the trunk, master slave RS 422/485 control networks are connected to LON as special subnets by dedicated gateways. It is an implementation method for isomerous control network integration. Data management is ranked according to real time requirements for different network data. The core components, such as control network nodes, router and gateway, are detailed in the paper. The design utilizes both communication advantage of LonWorks technology and the more powerful control ability of universal MCUs or PLCs, thus it greatly increases system response speed and performance cost ratio.

Distributed Generation Islanding Effect on Distribution Networks and End User Loads Using the Master-Slave Islanding Method

This study aims to address the feasibility of planned islanding operation and to investigate the effect of unplanned islanding using the master-slave islanding method for controlling the distributed generation units during grid-connected and islanding operation. Neplan desktop power simulation tool was used for the modelling and simulation of a realistic MV network with four different distributed generation technologies (diesel, gas, hydro and wind) along with their excitation and governor control systems, while an exponential model was used to represent the loads in the network. The dynamic and steady state behavior of the four distributed generation technologies were investigated during grid-connected operation and two transition modes to the islanding situation, planned and unplanned. The obtained results that validated through various case studies have shown that a suitable planned islanding transition could provide support to critical loads at the event of electricity utility outages.

Content Addressable Memory Using Automatic Charge Balancing with Self-Control Mechanism and Master-Slave Match Line Design

Content Addressable Memory (CAM) is a type of memory used for high-speed search applications. Due to parallel comparison feature, the CAM memory leads to large power consumption which is caused by frequent pre-charge or discharge of match line. In this paper, CAM for automatic charge balancing with self-control mechanism is proposed to control the voltage swing of ML for reducing the power consumption of CAM. Another technique to reduce the power dissipation is to use MSML, it combines the master-slave architecture with charge minimization technique. Unlike the conventional design, only one match line (ML) is used, whereas in Master-Slave Match Line (MSML) one master ML and several slave MLs are used to reduce the power dissipation in CAM caused by match lines (MLs). Theoretically, the match line (ML) reduces the power consumption up to 50% which is independent of search and match case. The simulation results using Cadence tool of MSML show the reduced power consumption in CAM and modified CAM cell.

Discussion and Practice on Talent Cultivation Model Based on OBE Concept in Veterinary Medicine Graduate Education

To address the challenges in training veterinary master’s students,it is essential to align with the core objectives of veterinary graduate education.This involves focusing on faculty development,course design,innovative teaching methods,university-industry collaboration,and reforming the evaluation system.By applying the outcome-based education model,new approaches to veterinary graduate training can be developed,particularly for applied talent development in agricultural universities serving local communities.This innovative model emphasizes ideological and political education,aiming to enhance students’abilities in knowledge and practical innovation,preparing them to be well-rounded professionals.The goal is to cultivate senior veterinary experts who are not only skilled in academic research and scientific inquiry but also committed to advancing agriculture,rural areas,and supporting rural revitalization.This approach provides a valuable framework for fostering highly qualified graduates who are both technically proficient and socially responsible.

Innovation Transformation and Industry-Education Integration:A Study on the Integration Path of Guangxi Zhuang’s Intangible Cultural Heritage and Master of Arts Education in China

This study focuses on the master of arts education in higher education institutions in Guangxi Zhuang Autonomous Region of China,explores the path of integrating Guangxi Zhuang’s intangible cultural heritage with the teaching of master of arts,and puts forward the teaching mode of“thinking guidance-autonomous judgement-program construction.”A theoretical model of innovative transformation of intangible cultural heritage is also summarized.Through the development of this study,it is expected to further enrich the practical teaching mechanism of master of arts education in Chinese universities and form a master of arts teaching model with strong local cultural characteristics.At the same time,the teaching reform based on the integration of Guangxi Zhuang’s intangible cultural heritage and master of arts education also has strong practical significance for promoting the inheritance and innovation of Chinese intangible cultural heritage,promoting the development of cultural and creative industries,and serving the economic and social development of Guangxi.

Mc Master模式家庭干预在肝母细胞瘤新生儿中的应用

目的探讨Mc Master模式家庭干预在肝母细胞瘤(HB)新生儿中的应用效果。方法将20例HB新生儿依据干预方式的不同分为对照组(n=9)和观察组(n=11),对照组接受常规护理干预,观察组接受Mc Master模式家庭干预。比较两组家庭功能[家庭功能评定量表(FAD)]、家属应对方式[简易应对方式问卷(SCSQ)]、亲职压力[亲职压力指数简表(PSI-SF)]、患儿每日哭闹次数和哭闹持续时间。结果干预后,两组FAD、SCSQ消极应对维度评分均下降,SCSQ积极应对维度评分均升高,且观察组FAD、SCSQ消极应对维度评分均低于对照组,SCSQ积极应对维度评分高于对照组,差异均有统计学意义(P﹤0.05)。干预后,两组亲职愁苦、困难儿童、亲子互动失调评分及总分均较干预前下降,且观察组亲职愁苦、困难儿童、亲子互动失调评分及总分均低于对照组,差异均有统计学意义(P﹤0.05)。干预后,两组患儿每日哭闹次数均减少,哭闹持续时间均缩短,且观察组患儿每日哭闹次数少于对照组,哭闹持续时间短于对照组,差异均有统计学意义(P﹤0.05)。结论Mc Master模式家庭干预应用于HB患儿中,能够提高家庭功能,降低亲职压力水平,促使家长采用积极应对方式,减少患儿哭闹,具有一定应用价值。

McMaster模式家庭干预对中晚期肝癌患者自我效能、心理及生活状态的调节作用

目的分析Mc Master模式家庭干预对中晚期肝癌患者自我效能、心理及生活状态的调节作用。方法选取2012年7月至2014年7月期间在本院接受住院治疗的中晚期肝癌患者106例作为研究对象,根据接受的干预方式不同,所有入组患者分为观察组及对照组各53例。对照组患者接受临床常规干预,观察组患者接受Mc Master模式家庭干预。采用一般自我效能感量表(GSES)、患者积极度测量量表(PAM)、癌症交流和态度自我效能量表(CASE-cancer)、健康行为自我评价量表(SRAHP)评价两组患者接受不同家庭干预后的自我效能、心理状态及生活质量评分差异。结果 (1)观察组患者接受干预后的一般自我效能感量表(GSES)、患者积极度测量量表(PAM)、癌症交流和态度自我效能量表(CASE-cancer)、健康行为自我评价量表(SRAHP)的评分均高于对照组,差异均有统计学意义(P<0.05);(2)观察组患者干预后的心理状态评分中,躯体性、强迫症状、人际关系敏感、抑郁、焦虑、敌对、恐怖、偏执以及精神病性评分均低于对照组,差异均有统计学意义(P<0.05);(3)观察组患者干预后的生理机能、生理职能、躯体疼痛、一般健康状况、精力、社会功能、情感职能、精神建立的评分均高于对照组,差异均有统计学意义(P<0.05)。结论 Mc Master模式家庭干预应用于中晚期肝癌患者中,可以有效提升其自我效能,优化心理状态及生活质量,具有积极的临床意义。

基于PCI总线直接MASTER模式的高速数据采集

介绍在 PCI总线上直接进行 MASTER模式高速数据采集的设计和应用。

New Approach for Solving Master Equations in Quantum Optics and Quantum Statistics by Virtue of Thermo-Entangled State Representation

By introducing a fictitious mode to be a counterpart mode of the system mode under review we introduce the entangled state representation （η｜, which can arrange master equations of density operators p（t） in quantum statistics as state-vector evolution equations due to the elegant properties of （η｜. In this way many master equations （respectively describing damping oscillator, laser, phase sensitive, and phase diffusion processes with different initial density operators） can be concisely solved. Specially, for a damping process characteristic of the decay constant k we find that the matrix element of p（t） at time t in 〈η｜ representation is proportional to that of the initial po in the decayed entangled state （ηe^-kt｜ representation, accompanying with a Gaussian damping factor. Thus we have a new insight about the nature of the dissipative process. We also set up the so-called thermo-entangled state representation of density operators, ρ = f（d^2η/π）（η｜ρ〉D（η）, which is different from all the previous known representations.

基于DM642 PCI Master读方式的AVS视频数据传输实现

介绍了AVS解码器的系统构成;研究了基于TMS320DM642芯片实现PCI主模式读方式的数据传输系统。给出了在嵌入Linux操作系统下通过DM642 PCI主模式读方式实现AVS视频数据传输的具体方法;给出了视频数据接收线程与视频解码线程间的相互切换方法并配合内存映射、环行缓冲等方法,实现AVS视频流实时解码。实际结果证明此解码系统能满足实时性要求。