Introduction

小说讲述了艾格妮丝·格雷作为一名牧师的女儿,在家庭遭遇经济困境后,为了谋生而成为两个富裕家庭孩子的家庭教师的经历。通过与布卢姆菲尔德和默里两大家庭的互动,她了解到教育顽劣、被宠坏的孩子所带来的挑战,以及财富与地位如何扭曲社会价值观。在父亲去世后,她的母亲开办了一所学校,并让她担任教师,最终她找到了真爱。

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<p class="MsoNormal" style="margin: 0cm 0cm 0pt; text-indent: 30pt; line-height: 200%;"><span style="font-size: 12pt; line-height: 200%;" lang="EN-US"><span style="font-family: Times New Roman;">The novel tells the story of Agnes Grey, the daughter of a minister, whose family comes to financial ruin. Desperate to earn the money to care for herself, she takes one of the few jobs allowed to respectable women in the early Victorian era – the role of governess to the children of the wealthy. In working with two different families (the Bloomfields and the Murrays), she comes to learn about the troubles that face a young woman who must try to reign in unruly, spoiled children for a living, and about the ability of wealth and status to destroy social values. After her father's death, Agnes’ mother opens a small school and makes her be a teacher and at that time finds happiness with a man who loves her for herself.</span></span><span style="" lang="EN-US"></span></p>
内容概要:本文详细介绍了如何使用STM32微控制器精确控制步进电机,涵盖了从原理到代码实现的全过程。首先,解释了步进电机的工作原理,包括定子、转子的构造及其通过脉冲信号控制转动的方式。接着,介绍了STM32的基本原理及其通过GPIO端口输出控制信号,配合驱动器芯片放大信号以驱动电机运转的方法。文中还详细描述了硬件搭建步骤,包括所需硬件的选择与连接方法。随后提供了基础控制代码示例,演示了如何通过定义控制引脚、编写延时函数和控制电机转动函数来实现步进电机的基本控制。最后,探讨了进阶优化技术,如定时器中断控制、S形或梯形加减速曲线、微步控制及DMA传输等,以提升电机运行的平稳性和精度。 适合人群:具有嵌入式系统基础知识,特别是对STM32和步进电机有一定了解的研发人员和技术爱好者。 使用场景及目标:①学习步进电机与STM32的工作原理及二者结合的具体实现方法;②掌握硬件连接技巧,确保各组件间正确通信;③理解并实践基础控制代码,实现步进电机的基本控制;④通过进阶优化技术的应用,提高电机控制性能,实现更精细和平稳的运动控制。 阅读建议:本文不仅提供了详细的理论讲解,还附带了完整的代码示例,建议读者在学习过程中动手实践,结合实际硬件进行调试,以便更好地理解和掌握步进电机的控制原理和技术细节。同时,对于进阶优化部分,可根据自身需求选择性学习,逐步提升对复杂控制系统的理解。
### Aspect Oriented Programming (AOP) Introduction and Basic Principles #### Definition of AOP Aspect-Oriented Programming represents a programming paradigm that aims to increase modularity by allowing the separation of cross-cutting concerns. It creates a new way to think about program structure, beyond objects, procedures or functions. Cross-cutting concerns refer to behaviors that span multiple points in an application, such as logging, transaction management, security checks, caching mechanisms, etc.[^1] #### Core Concepts The core concepts within AOP include aspects, join points, pointcuts, advice, introductions, weaving, and interceptors. - **Aspects**: An aspect defines a particular concern affecting many parts of an application. - **Join Points**: These represent specific points during execution where additional behavior can be inserted—such as method calls, exception handling blocks, field access operations, etc. - **Pointcuts**: Pointcuts define precisely which join points should have extra functionality applied; they match one or more join points based on certain criteria defined through expressions. - **Advice**: Advice encapsulates actions taken around join points matched by associated pointcut definitions—it specifies what action needs performing before/after/before-and-after those moments occur. - **Introductions**: Introducing new methods or fields into existing classes without modifying their source code directly allows adding capabilities not originally present while maintaining original class integrity. - **Weaving**: Weaving refers to combining aspects with other pieces of software to create final woven programs ready for deployment. This process happens either statically at compile-time or dynamically at runtime depending upon implementation strategies chosen. - **Interceptors**: Interceptors act similarly to advices but operate specifically over service layer invocations often found inside enterprise applications built following layered architectures patterns like MVC. ```java @Aspect public class LoggingAspect { @Before("execution(* com.example.service.*.*(..))") public void logMethodEntry(JoinPoint joinPoint){ System.out.println("Entering Method : " + joinPoint.getSignature().getName()); } } ``` This example demonstrates how simple it becomes implementing logging across all services under `com.example.service` package using just few lines thanks to powerful features provided by frameworks supporting this approach natively such as Spring Framework's AOP module. --related questions-- 1. What are some common use cases for applying AOP? 2. How does AOP differ from OOP paradigms concerning design principles? 3. Can you provide examples illustrating different types of advice available in AOP implementations? 4. Explain the concept of 'weaving' in relation to AOP and its significance. 5. Discuss potential drawbacks or challenges faced when adopting AOP practices?
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