Energy aware schedule of periodic tasks in embedded real time systems

For the energy aware schedule of battery powered real time embedded system, a novel offline energy aware schedule algorithm is proposed based on the improved artificial fish school algorithm(IAFSA). The algorithm constructs the behavior constraint of the artificial fish to make the random search meet the energy constraint and deadline while maximizing the system reward. Experimental results show that the proposed algorithm improves the system reward about 47% compared with the Greedy algorithm. Besides, the energy efficiency increases while the energy budget decreases, which demonstrates the good energy awareness efficiency of the proposed algorithm.     

农业大棚嵌入式无线温控系统设计

为了有效实施农业大棚温度动态实时监控,提出采用Zigbee无线网络和Linux嵌入式操作系统设计大棚温度监控系统。系统采用C/S结构设计,分为下位机和上位机2部分。下位机系统分为温度采集节点和汇聚节点,温度采集节点完成大棚内不同地点的温度信息采集和无线数据传输功能;汇聚节点除了完成数据中继任务外,还可根据上位机反馈的控制指令完成排风扇的打开或电热系统的开启工作;服务器端的上位机系统完成数据的储存和分析,并根据分析结果完成对下位机系统的实时控制。实践证明,该系统可精确监控大棚温度,有效降低布线成本,有助于降低劳动成本和提高农作物产量。     

Study on Approach to Optimize Network Planning Schedule for Fixed Resources Constraint

Network planning schedule optimization is one of the pivotal issues in engineering project management. The current studies on schedule optimization aim at achieving the optimal goals by least additional resources. In this paper, from transferring the critical path, the authors suggest a schedule optimization algorithm through transferring partial resource of un-critical activities to the critical activities. The result of applying the model shows that it is helpful for resolving schedule optimization issue for fixed resources.     

Analysis of IC Management System of Computer Room

This paper analyzes the features of existing IC management system of computer room, deficiencies and new orientation in this domain. The structure and realization of a new system developed by the authors was introduced. Meanwhile, this paper analyzes the electronic school schedule. Finally, the features of new IC management system of computer room are analyzed.     

Development of Embedded ECG Monitor Based on Linux

Presently, ECG monitor encounters the trend of miniaturizing, intelligentizing and networking. Short distance and limited channels are shortcomings of the existed telemetric ECG (Electrocardiograph) monitoring system, while the existed remote monitoring system has the disadvantages of high cost and low Data Transfer Rate. Furthermore, neither of these two systems can implement real-time monitoring on the spot. So, an embedded ECG Monitor based on Linux, which successfully solves these problems, is introduced. With embedded system technique, this embedded monitor, which can not only realize real-time monitoring on the spot, but also analyse the ECG data, has the advantages of low cost, small volume, light weight, low power, high stability, powerful networking function and so on. And by communicating through Internet, which has the features of low cost, high data transfer rate and good expandability, it can also send ECG data to monitoring center in order to achieve long-term monitoring. The development of this monitor provides a new solution for medical instruments' implementation and networking, and is of certain reference value.     

Realizing Key Schedule of Rijndael Algorithm Integrating with Chaos

Encryption is an important method which is used to protect the information of an individual and enterprises and the secret of nations. Rijndael algorithm is the new advanced encryption standard, and has extensive application foreground because of its much merit. Modem encryption algorithms are based on keys. However, so far few of people research into the key schedule of rijndael algorithm and especially do research on the generation of its initial keys. This paper researches into the mapping of Logistic, makes use of a chaos algorithm to produce initial encryption keys because it can create chaos sequences of high randomicity. Further more, corresponding CPLD implementation is given.     

Analysis on Predictive Methods of BIM Based on Construction Schedule Reliability

In order to realize the predictive function of BIM technology, the reliability theory and theoretical probability method are utilized to judge the uncertainty which exists in the process of construction. Meanwhile, the complicated relationship between construction schedule and prediction model is analyze, the random prediction model for construction schedule is established as well. Particularly, the influencing condition about a single factor in the process of construction is taken into consideration. Determinate model and random model for construction time as well as reliability analysis method for the construction time prediction which is based on a single influencing factor are studied .At the same time, The integrated management method of reliability prediction about construction schedule which is on basis of BIM management platform is discussed. The case study shows that the proposed method has delivered dramatic results to the control of construction schedule.     

自动化加热排湿烤烟房烘烤工艺初探

自动化加热排湿烤烟房是近年来中国烟草发展的一个主题,为了探明该烤烟房配套的烘烤工艺,依据现有烘烤理论和自动化加热排湿烤烟房的研究结果,设置自动供热排湿热风循环烤房的烘烤工艺,以传统的三阶段烘烤工艺为对照进行了烘烤比较。结果表明：设置的烘烤工艺阶段简单,操作方便,烟叶烘烤后,比三阶段烘烤工艺烘烤的烟叶桔黄烟比例、上等烟比例、上中等烟比例分别增3.38、4.74、2.03个百分点,鲜干比增高0.03,均价提高0.53元/kg;总糖、淀粉、总氮、烟碱、烟碱氮、蛋白质的含量及总糖与还原糖的差值有所降低,烟叶化学成分更为协调。     

Realization of Multi-task Scheduling in Linux Based IPC Measurement and Control System

Industrial Personal Computer(IPC) system generally works in long duration,and so a stable software is essential for an IPC system.Linux has a good deal advantages,such as,stability in use,open source code and free of charge, therefore an IPC measurement and control system has developed based on Linux. Multi-task scheduling is the critical part in system software.A simple method to realize multi-task scheduling in IPC measurement and control system based on Linux alarm clock mechanism is presented. Linux alarm clock mechanism is implemented by the cooperation of software timers and system call that is used to install and handle alarm clock.First, Linux process timers,soft interrupt signals, relevant system call are introduced,as well as applications of Linux alarm clock mechanism in multi-task scheduling. And then an example of the application in the IPC measurement and control system is given. The system has passed longtime run test,accomplished expected functions and shown well stability, so that practicability of the scheduling method has been authenticated.     

Calculation model for the turnover number of steel ladle based on casting schedule

In order to realize optimization of production organization and put forward a reasonable calculation model for the turnover number of steel ladle, the turnover process and time of steel ladle are analyzed with steel ladle of Q steelmaking plant. Gantt charts of steel ladle turnover for single casting schedule and double casting schedule are drawn. Calculation model for turnover number of steel ladle is put forward by analyzing the relationship between casting schedule and the turnover time of steel ladle, and the accuracy of the model is verified by simulation method. Researches show that the turnover number of steel ladle can be reduced 1-2 by adjusting cast starting time, and have significance for the optimization of steel ladle production organization.     

Reliability-aware schedule of periodic tasks in energy-constrained real-time systems

The Dynamic Voltage Scaling(DVS)technology which is widely used in numerous energy management schedule has negative effect on system reliability. Based on the artificial bee colony algorithm (ABC), two noble reliability-aware schedule algorithms are proposed for DVS systems with discrete frequencies, which will meet the energy constraint and deadline naturally while maximize the reliability of the system. The simulation results indicate that the dynamic schedule algorithm outperforms the static schedule algorithm, and its performance is close to that of the optimal scheduler that knows the exact workload in advance.     

OPTIMUM METHOD OF OVERALL CONSTRUCTION SCHEDULE AND ITS COMPUTER APPLICATION

This paper discusses the optimum method of overall construction schedule in the view of systematization and analyszes the factors concerned with overall schedule. It provides a mathematical model of optimization the goal of best general economical benefit. A calculation programme for this model is drawn up and the operating procedures is told. This method overcomes the limitation of current optimum method,and provides construction mnagers a scientific tool in optimizing and adjusting overall construction schedule.     

嵌入式Linux系统在粮库中的应用

近年来，随着嵌入式计算机技术的飞速发展，嵌入式系统得到了越来越广泛的应用，尤其是在工控、仿真、数据采集等领域。嵌入式系统需要嵌入式操作系统作支持，而由于Linux操作系统结构清晰，源代码开放性等方面的优势，在嵌入式系统中也得到了广泛的应用。本文以中央储备粮赤壁直属库管理监控系统的设计为背景，论述了基于Linux的嵌入式工作站取代传统的工控机为主的现地控制单元在粮库管理监控系统中的应用过程以及基于Linux的嵌入式工作站的设计。     

Schedule of Two level Multi object based on Relatively Prior Weight

The default of conventional schedule is expounded, which only emphasizes on system's overall object but overlooks sub system's local object. A mathematical model of two level multi object is put forward. The concept of relatively prior weight is defined, and a heuristic algorithm is given out. The results of computer simulation show that the algorithm is effective.     

Real-Time Strategies for the Fire Alarm Information System Based on Internet

According to the reality of the development of fire alarm system in our country, this paper offers a fire alarm information system based on Internet. Being different with the way of normal router in transmitting all data packages fairly, a new dispatch algorithm is put forward, which can identify different data packages of demanding different real-time performance and transmit the data packages of demanding high real-time performance by jumping queue intelligently. That decreases warning time delay and improves the dependability of important data transmitted by router. A new kind of method is proposed to satisfy a high real-time system at a low cost.     

The Relationship of Strength,Pore Structure andAutoclaving Schedule of Lime_Sand Concrete

The influences of autoclaving schedule on the compressive strength,bending strength,spliting strength and fracture energy are studied by testing the strengths,fracture energy,pore structure and BET surface of lime_sand concrete with 2 kinds of mix proportion and 8 autoclave schedules.The purpose of the work is to explain the changes of mechanical behaviors of lime_sand concrete by the data of pore structure and BET surface.     

基于Linux＋Apache＋MySQL＋PHP的棉花分子生物学数据库系统构建

 利用课题组积累的数据信息和网上公用数据库中有关棉花分子生物学数据,采用MySQL为后台数据库,以Apache＋PHP为环境,在Linux操作系统下实现了棉花分子生物学数据库系统的构建和wwwBLAST的本地化服务。在脱机状态下使用blast进行同源性比对,使得数据查询和序列比对更加方便、快捷、稳定和安全,而且增强了针对性。数据库最终以局域网的形式发布,通过授予权限可向同行提供利用。本课题组在棉纤维品质、黄萎病抗性等相关基因的克隆研究中使该数据库得到初步应用。     

Rapid Prototype Control of Hydraulic Automatic Transmission System Based on dSPACE

dSPACE is a prototype development and real-time control testing platform which is based on MATLAB/Simulink software. By establishing mathematic model of hydraulic automatic transmission system, the shift rules are achieved. A testing platform for hydraulic automatic transmission system is developed whose control software is programmed by simulink and using the dSPACE as the centre controller. The experiment of electric throttle control and power performance matching control of hydraulic automatic transmission system is carried out. the result shows that well matching performance of hydraulic automatic transmission system can be realizedby using the control strategy proposed in this paper, it provides a fast and efficient approach for researching and developing the hydraulic automatic transmission system.     

巨尾桉干燥特性研究

研究巨尾桉木材的干燥特性并制定干燥基准,为实际生产中制定合理的干燥工艺提供理论依据。采用百度试验法,在(100±2)℃恒温干燥条件下对巨尾桉试件进行干燥试验,根据干燥过程中巨尾桉试件的初期开裂、内裂、截面收缩等干燥缺陷制定出巨尾桉木材的干燥基准。巨尾桉试件的初期开裂、内部裂纹、截面变形、扭曲变形和干燥速度分别为1级、2级、3级、2级和2级;体积干缩率为19.04%,弦向干缩率为9.60%,径向干缩率为6.65%,纵向干缩率为0.33%。巨尾桉的干燥初期温度为60℃,干燥初期干湿球温度差为3~5℃,干燥终期温度为75℃。厚度为25 mm的巨尾桉板材在强制循环干燥窑内干燥至10%所需的时间为10（8）天（括号内为硬基准条件下的干燥时间）。巨尾桉试件主要缺陷是内裂和截面变形,在实际生产过程中要尽量使用软基准,干燥中、后期适时进行调湿处理。     

基于LoadRunner的Web考试系统性能测试与优化

Web系统性能测试以验船师考试系统作为测试对象,结合系统性能测试复杂、多用户负载模拟难度较高的现状,重点针对该系统应用的实时性、稳定性和容错性特点,设计了一种基于LoadRunner的面向验船师考试系统的性能测试方案,对考试系统的关键环节、资源分布情况、硬件性能进行测试。在对测试结果分析的基础上,找出影响系统性能的关键性因素,提出了系统性能优化方案,并对系统进行调优。通过对验船师考试系统的性能测试及优化方法的研究,解决了该系统的性能问题,为Web应用的性能测试提供了有效的测试及优化方法。