基于优先级调度算法的TXC设备的设计

多任务处理通常基于多任务操作系统，由多任务OS的核心系统调度器根据各个任务的优先级来调度CPU的控制权。但在多任务系统平台上进行产品开发，不仅成本高，而且开发周期长。以TXC设备为例，讲述了单任务平台上多任务处理的实现机制——基于优先级的调度算法。     

基于实时多任务操作系统的智能脱扣器系统软件设计

为了克服传统的顺序软件结构导致软件代码结构复杂、可移植性和可扩展性差的缺点，提出了基于实时多任务操作系统--IR-OS的智能脱扣器系统的设计方法，并得到实际应用。IR-OS采用了抢占优先级调度方式，内核代码简洁，并为用户提供开发接口，实际应用证明，采用实时多任务操作系统作为智能脱扣器开发和运行平台，具有很好的运行稳定性、可靠性和实时性。     

μC/OS-Ⅱ内核任务调度算法的改进

μC/OS-Ⅱ是一个基于任务优先级抢占式的实时内核,但它不具有相同优先级任务的实时调度功能.为了使μC/OS-Ⅱ内核既支持不同优先级的多任务抢占式调度,又支持同一优先级的多任务调度,提出对μC/OS-Ⅱ内核的改造,加入以时间片轮转调度算法进行相同优先级任务的调度.方法是保持原有不同优先级抢占式调度链表,增加相同优先级的时间片轮转调度链表,通过任务控制块指针使任务调度在2个链表之间切换.给出了在μC/OS-Ⅱ任务调度模块中算法改进的实现步骤、实验过程和结果.结果说明了提出的改进调度算法是可行的.     

uC/OS-Ⅱ在LPC2200平台上的移植

μC/OS-Ⅱ是一种基于优先级的抢占式多任务实时操作系统,本文介绍了μC/OS-Ⅱ操作系统内核在LPC2200平台上的移植实现过程极其测试方法。     

基于Matlab仿真平台的多任务实时调度仿真

任务的调度策略是实时系统中的关键内容,直接影响系统的性能,多任务实时系统的调度问题是实时系统中的重要研究方向。基于Matlab仿真平台,利用其自带的Simulink软件包,并结合Turetime-1.5工具箱,构建多任务实时系统的仿真平台,实现对典型的调度算法的调度仿真。     

一种实时多任务管理机制

研究一种实时多任务管理机制．讨论了ＲＭＤＯＳ系统结构与支撑环境、多任务控制流程和调度问题．该管理机制实现了可变优先级加时间片轮转的调度策略和网络任务的实时响应．它作为多任务操作系统的核心，成功地支持了分布式操作系统ＨＺＤＯＳ的实现和分布式并行任务分配，支持了分布式系统故障恢复与系统重构     

ARM GPU的多任务调度设计与实现

针对现有GPU任务调度系统在多任务环境下不能保证图形任务响应时间的问题,提出基于分类和多优先级队列(CPMQ)的调度方案,并在ARM的嵌入式GPU上实现验证。该方案中,将GPU的多任务划分为图形任务、通用计算任务和实时图形3类任务并分别建立队列排队,其中图形任务和通用计算任务按照优先级在各自队列中排队,实时图形按照任务截止时间排队。面向多队列的任务调度,优先从实时任务队列中选择任务,并按照加权公平算法分别在图形任务队列和通用计算队列中选择任务。实验结果表明:相比于ARM GPU的原有调度系统,CPMQ在不显著增加通用计算任务的执行时间和调度开销的情况下,将实时图形任务的帧率提升了5%~20%。     

一种Linux用户态实时多任务调度框架

Linux内核调度器的调度开销巨大,无法满足实时应用需求.为此设计并实现了基于多核Linux的用户态实时多任务调度框架ULight.ULight共包括三个核心模块:多任务调度模块、定时器模块以及用户态中断处理模块.多任务调度模块在Linux用户态提供基于优先级可抢占的实时多任务调度方案,旨在减少任务调度和切换开销;定时器模块则为多任务调度提供高精度的定时服务,以支持分时调度和任务休眠,并提供更多的抢占点;用户态中断处理模块通过在内核态和用户态之间构造中断处理的快速通道,使用户态任务可以直接处理硬件中断,保证中断处理的实时性和高效性.实验表明,ULight的任务切换效率明显优于Linux的线程切换效率;定时系统可以提供精度为20μs的稳定的定时服务;用户态中断处理模块能够在用户态完成对硬件中断的快速响应.     

基于通用DSP的数字电视信源解码器的软件实现

为实现数字电视信源解码器，提出了一种基于通用数字信号处理器的总体方案，并在嵌入式实时操作系统μC/OS-Ⅱ提出了以数据为驱动源，基于任务优先级的多任务实时调度策略，成功地实现了对传送流输入、解复用、音频解码、视频解码、视频显示和音频播放等任务的实时调度．本系统全软件实时实现了单路标准清晰度数字电视信源解码器的功能，CPU利用率约为90％．     

基于调度效益最大化的多功能组网认知雷达资源优化调度算法

在组网认知雷达中,针对多目标多任务(如搜索、跟踪与成像等)按优先级进行资源调度时易造成目标任务丢失的问题,提出基于调度效益最大化的多功能组网认知雷达资源优化调度算法。该算法将搜索与跟踪任务的时间窗考虑到目标函数中,通过目标任务的重要性(优先级)和有效性(时间窗)两个因素的加权来表示雷达对目标任务的调度效益,根据调度效益最大准则建立并利用遗传算法求解资源调度模型。对仿真结果分析表明,该方法能够提高组网认知雷达的整体效能。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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