数字信号处理中相位解卷绕问题分析——使用Matlab语言

对Matlab语言中能够保持复向量相位连续性的两个解卷绕命令unwrap和phase的使用方法进行比较,指出它们之间的不同之处。对其源文件进行深入解读,并举例说明同一信号在这两个命令的作用下所得结果不相符的原因。最后通过修改phase命令的M文件或改变unwrap命令的输入参数使二者的输出达到一致,从而扩大了这两个命令的适用范围。     

基于Matlab语言的温室作物蒸腾模型

为了简单方便地对作物的蒸腾量进行准确的预测,从而按照作物的最佳生长轨迹所要求的蒸腾量给定水分,对作物的生长环境进行调控,以Matlab模糊逻辑工具箱中的图形用户界面(GUI)和命令函数为工具构建了以辐照量和相对湿度为输入的温室作物的模糊蒸腾模型,得到了符合温室作物蒸腾规律的较为满意的仿真结果,证明了模型的合理正确性,并对模型的优化做了简要概述。     

结构化查询语言应用实例

提示:本文以虚拟的数据库中名称为学生花名册、课程清单以及成绩总表的三张基本表为基础,讨论了SQL对数据查询的支持的Select命令.通过实例的给出与分析,对常见的查询要求以及相关的select命令的使用方式,行了细致的讲述.在讲述过程中,还对Select命令的构造进行了逐步的分析,这有助于读者学习查询命令的构造.……     

结构化查询语言实用技巧

本文分析了SQL对数据的插入、更新、删除等数据操作的支持命令的格式。通过具体的例子,详细的给出了构造这些数据操纵命令的逻辑过程,希望能对读者掌握这些命令有所帮助。Select是结构化查询语言SQL对从表中查询数据的操作的支持命令,功能强大。利用Select命令,可以很方便的从数据库的表格中按照用户的需求查询数据。但我们中国人有句俗话叫"巧妇难为无米之炊",这句话同样适用于Select命令:在数据库中,对一张空的基本表进行查询操作,显然不会有什么实际的意义。为了使基本表中含有有效的应用数据,需要把合适的数据加入到基本表中;不再使…     

VC＋＋调用Matlab的方法

研究了如何应用VC + +调用Matlab工具内部类的问题.通过Matlab的MCC命令和COM组件的方法实现了对Matlab程序的调用.应用这两种方法不仅可以使程序完全脱离Matlab环境运行,而且能够充分发挥VC和Matlab的优点,大大提高了软件速度和性能.     

扩展批处理语言及其应用

本文详细阐述了扩展ＤＯＳ内部命令，以增强批处理语言指令的方法，给出了安装ＤＯＳ内部命令的例程，最后给出了两个有用的实例，以说明批处理语言的强大功能及使用技巧。     

液晶显示模块LCM046的C语言编程

LCM046是一种新型的4位多功能通用型8段式液晶显示模块，其显示驱动主要分为初始化和写数据两大部分。其中初始化是给模块写入必要的控制命令。写数据则有两种方式，第一种是每写一个命令或显示数据都要对模块进行一次片选，并且重复发模式数据(100或101)。另一种则只进行一次片选并只发一次模式数据，也称连续写；因此，可将多个显示数据连续写入模块，该模式只适用于显示段码的写入，而不能用于命令写入。编程时，只要根据段码的内存单元将每个欲显示内容按8位一个字节进行编码，送入写函数即可。     

Matlab中的数据文件的处理

总结了matlab中有关数据文件I/O等方面的命令 ,就有关的参数进行了描述 ,展示了matlab对数据文件处理的强大功能 ,结合工作中遇到的实际问题 ,列举了几种处理复杂数据文件的应用。     

超文本语言及网页制作

ＨＴＭＬ语言在网页制作上应用广泛,在这里,我将一些常用的标签语言作以下介绍,以供一些初级的网页制作爱好者作参考。Ｈｔｍｌ命令分类 文件结构命令：用来标注出文件的结构。 区段格式命令：将ＨＴＭＬ文件中的某区段文字一特定的格式显示。 下锚连接命令：标记超文本连接。 字符格式命令;用于设置字符的显示格式。 图像命令：用于显示图像资料。 列表命令：用于制作明细清单。 表格命令：用于制作各种表格。 ｌ）文件结构命令 ＨＴＭＬ文件的结构：一般有两部分构成：表头区（ＨｅａｄＳｅｃｔｉｏｎ）、主题区（Ｂｏｄｙ　Ｓｅｃｔ…     

用C语言及批处理文件实现驱动器和目录的一次性改变

在微机应用中,需要不时地改变当前的工作目录.DOS提供的CD命令简易、方便,但其最大的缺点就是一次只能做一件事情,要进入其它盘的某个目录时,必须先改变盘符再使用该命令.笔者分别用C语言和批处理命令编写了两个程序(源清单附后)很好地解决了这一问题.程序—(LCD.C)在TC或BC上编译通过,可以很容易地在不同驱动器之间切换目录.格式为:     

A distributed command governor based on graph colorability theory

In this paper, a distributed command governor (CG) strategy is introduced that, by the use of graph colorability theory, improves the scalability property and the performance of recently introduced distributed noncooperative sequential CG strategies. The latter are characterized by the fact that only 1 agent at a decision time is allowed to update its command, whereas all the others keep applying their previously computed commands. The scalability of these early CG distributed schemes and their performance are limited because the structure of the constraints is not taken into account in their implementation. Here, by exploiting the idea that agents that are not directly coupled by the constraints can simultaneously update their control actions, the agents in the network are grouped into particular subsets (turns). At each time instant, on the basis of a round‐robin policy, all agents belonging to a turn are allowed to update simultaneously their commands, whereas agents in other turns keep applying their previous commands. Then, a turn‐based distributed CG strategy is proposed and its main properties are analyzed. Graph colorability theory is used to determine the minimal number of turns and to distribute each agent in at least a turn. A novel graph colorability problem that allows one to maximize the frequency at which agents can update their commands is proposed and discussed. A final example is presented to illustrate the effectiveness of the proposed strategy.     

Modeling the effects of emphasis and question on fundamental frequency contours of Cantonese utterances

Emphasis and question are two factors that have significant effects on F/sub 0/ contours for various languages, among which tone languages require more careful study because their F/sub 0/ contours show complex interaction between lexical tones and sentence intonation. This paper employs the command-response model for the process of F/sub 0/ contour generation to investigate the effects of these two factors for Cantonese, a typical tone language with nine tones. Analysis shows that the major effect of emphasis is on phrase commands, whereas the polarity and the amplitude of the tone commands in the emphasized part are hardly affected so that the inherent tone command patterns are maintained. In the intonation question, the inherent tone command in the later part of the sentence-final syllable is always substituted by a positive tone command. The particle question, on the other hand, maintains the inherent tone command for the question particle. In both types of questions, a sentence-final phrase command is added or enhanced, and a particular ending tone command is attached, the amplitude of which can indicate the degree of inquisitive intention. By comparison, the effect of emphasis starts from the target part for emphasis but is not confined to it, whereas the effect of question is localized in the sentence-final part and especially concentrated within the ending syllable. Nevertheless, both of them can be represented in the framework of the command-response model, by which F/sub 0/ contours for expressive speech can be generated efficiently.     

A Maple package for improved global mapping forecast

We present a Maple implementation of the well known global approach to time series analysis and some further developments designed to improve the computational efficiency of the forecasting capabilities of the approach. This global approach can be summarized as being a reconstruction of the phase space, based on a time ordered series of data obtained from the system. After that, using the reconstructed vectors, a portion of this space is used to produce a mapping, a polynomial fitting, through a minimization procedure, that represents the system and can be employed to forecast further entries for the series. In the present implementation, we introduce a set of commands, tools, in order to perform all these tasks. For example, the command VecTS deals mainly with the reconstruction of the vector in the phase space. The command GfiTS deals with producing the minimization and the fitting. ForecasTS uses all these and produces the prediction of the next entries. For the non-standard algorithms, we here present two commands: IforecasTS and NiforecasTS that, respectively deal with the one-step and the N$N$-step forecasting. Finally, we introduce two further tools to aid the forecasting. The commands GfiTS and AnalysTS, basically, perform an analysis of the behavior of each portion of a series regarding the settings used on the commands just mentioned above.     

Botnet command and control based on Short Message Service and human mobility

Many serious threats for PCs are spreading to the mobile environment. A mobile botnet, which is a collection of hijacked smartphones under the control of hackers, is one of them. With the quick development of the computing and communication abilities of smartphones, many command and control (C&C) techniques in PC botnets can be easily reused in mobile botnets. However, some particular functions and characteristics of smartphones may provide botmasters with additional means to control their mobile botnets. This paper presents two special C&C mechanisms that leverage Short Message Service and human mobility, respectively. The first one designs a SMS-based flooding algorithm to propagate commands. We theoretically prove that the uniform random graph is the optimal topology for this botnet, and demonstrate its high efficiency and stealth with various simulations. The second one utilizes Bluetooth to transmit botnet commands when hijacked smartphones encounter each other while in motion. We study its performance in a 100 m × 100 m square area with NS-2 simulations, and show that human-mobility characteristics facilitate the command propagation. Even if the infection rate is low, the command can still be effectively propagated provided that the mobility of devices is high. In the end, we propose effective defense strategies against these two special C&C mechanisms.     

基于NXP5209的AT指令分析与扩展

分析了3GPP定义的AT指令规范,它是由终端发出的被用来控制和执行无线通信模块功能的指令。主CPU使用AT命令驱动通信模块工作。介绍了多路终端适配器的结构,ATCUST模块管理所有具有客户特征的AT指令和URC命令,通过对其中的ATCUST模块的修改实现AT指令的规范化和功能的扩展。     

ARINC661显控指令快速验证方法

针对ARINC661座舱显示系统中显示控制单元在开发阶段验证指令困难的问题,设计了一种解决方法.该方法不需要搭建联试环境,仅在控制指令开发的计算机上即可完成验证.该设计充分利用ARINC661通用内核进行扩展,在通用内核DF加载、指令解析、人机交互、画面渲染等基本功能的基础上,增加显示设备、虚拟UA的管理功能,既保证了辅助组件与实际显示画面的一致性,又能方便地模拟各种机载显示设备.该设计用直观的显示结果来验证控制指令的正确性,使设计人员能够方便快速地测试已开发指令的正确性,从而缩短试验周期,具有良好的适用性、扩展性和可靠性.     

Event,State, And Process In Arrow Logic

Artificial agents, which are embedded in a virtual world, need to interpret a sequence of commands given to them adequately, considering the temporal structure for each command. In this paper, we start with the semantics of natural language and classify the temporal structures of various eventualities into such aspectual classes as action, process, and event. In order to formalize these temporal structures, we adopt Arrow Logic. This logic specifies the domain for the valuation of a sentence as an arrow. We can connect, or give order to, arrows by defining inter-arrow operations, and can give different views for sentences. Thereafter we formalize the rules of aspectual shifts in situated inference, in the style of a logic programming language. Thus, we not only describe the static representation of temporal features, but also show the dynamic process to deduce how each eventuality is viewed. The rules are applied to the information flow through the sequence of commands; therefore, we consider how the temporal structure of a command affects the succeeding commands.     

Success rates in a multimodal command language for home robot users

This article considers the success rates in a multimodal command language for home robot users. In the command language, the user specifies action types and action parameter values to direct robots in multiple modes such as speech, touch, and gesture. The success rates of commands in the language can be estimated by user evaluations in several ways. This article presents some user evaluation methods, as well as results from recent studies on command success rates. The results show that the language enables users without much training to command home robots at success rates as high as 88%–100%. It is also shown that multimodal commands combining speech and button-press actions included fewer words and were significantly more successful than single-modal spoken commands.     

Full Abstraction for a Shared-Variable Parallel Language

We give a new denotational semantics for a shared-variable parallel programming language and prove full abstraction: the semantics gives identical meanings to commands if and only if they induce the same behavior in all program contexts. The meaning of a command is a set of “transition traces,” which record the ways in which a command may interact with and be affected by its environment. We show how to modify the semantics to incorporate new program constructs, to allow for different levels of granularity or atomicity, and to model fair infinite computation, in each case achieving full abstraction with respect to an appropriate notion of program behavior.