Simulink_QAM_System_Design

教授推荐的关于无线电仿真的书。含有MATLAB代码。

Due to the increasing use of power electronic devices in power regulation, the quality of power systems has been deteriorating. As a solution, passive shunt filters are used to suppress harmonics in these systems. This is achieved through a Simulink model design and implementation, where the passive harmonic filter effectively mitigates the effects of harmonics in the power system.

Library Management System Detailed Design Documentation utilizes Visual Basic as the front-end application development tool, with Access as the back-end database, running on the Windows 2000 platform. The entire system is built using Microsoft’s operating systems and development tools, ensuring consistency, integrity, and ease of use for the application. As a typical information management system, the goal is to enhance the efficiency of managing and circulating library resources through computer technology. System Components: User Management Module: Provides functionalities like user login, password modification, and security features. For instance, the system exits automatically after three failed login attempts. Algorithm descriptions are created using PAD diagrams to ensure secure user authentication. Library Business Data Flow: Analyzes the data flow through Data Flow Diagrams to clarify input, processing, storage, and output, ensuring information flow logic. Functional Module Design: Includes core subsystems such as book borrowing, user management, and book information maintenance. Each module has distinct functions and relationships, such as loan rules, maintenance, and report generation. Access Control: Implements high-level access control with database security authentication, enabling user creation and permission distribution. Custom access levels for different users like students and teachers, e.g., teachers can access restricted information views, ensuring data privacy. Through this design, the Library Management System supports library operations effectively, enhances information management, and meets user needs across multiple user types. It is also scalable to accommodate future demands.

Library Management System Course Design The Library Management System is a widely used IT project aimed at teaching students the principles and techniques of software engineering, particularly in the development of information management systems. The project requires the use of Visual Studio 2003/2005 as the development platform, and SQL Server 2000 as the database. Students will need to master the use of SQL queries, table creation, and data management. The system also utilizes ADO.NET for connecting to the database and managing data exchanges. Key functions to be implemented include: User Management: Registration, login, and permission control for administrators and regular users. Book Information Management: Adding, editing, and deleting book details like ISBN, title, author, and publisher. Borrow and Return Management: Handling borrowing, renewing, and returning books, as well as tracking their availability status. Search Features: Searching books by title, author, and category. Statistical Analysis: Analyzing the borrowing frequency and most popular books. Error Handling: Managing issues like overdue books and lost items. Through this project, students will experience all phases of the software development lifecycle such as requirement analysis, system design, coding, testing, and maintenance. Proper documentation, including requirement and design documents, along with version control (e.g., SVN or Git) and unit testing (e.g., NUnit), is also essential.

《数据库课程设计——学生公寓管理系统的设计与实现》在信息技术高速发展的今天，数据库技术作为支撑信息系统的基石，其重要性不言而喻。本项目“学生公寓管理系统的设计与实现”正是一个面向数据库课程设计的实践案例，让学生深入理解数据库在实际业务场景中的应用。系统设计的关键在于对数据的高效管理和处理，这包括了存储过程、触发器、视图和函数等核心概念的运用。存储过程是预编译的SQL语句集合，能够提高数据操作的效率和安全性，减少网络传输，同时提供了一种封装业务逻辑的方式。例如，在学生公寓管理系统中，可能会存在一个存储过程用于处理学生的入住和退宿流程，确保数据的一致性和完整性。触发器是一种在特定事件（如INSERT、UPDATE、DELETE）发生时自动执行的数据库对象，它可以用来维护数据库的完整性约束。在学生公寓管理中，当有学生信息变更或者房间状态变动时，触发器可以自动更新相关数据，确保信息的实时性和准确性。视图则是从一个或多个表中选择数据的虚拟表，它提供了数据的另一种视角，简化了复杂查询。对于管理员来说，可能更关心空闲房间的数量或者逾期未缴费的学生，通过创建相应的视图，可以快速获取这些信息。再者，数据库函数则是执行特定计算或操作的预定义程序，比如计算平均费用、查找最大最小值等。在本系统中，可能会有用于计算每个学生住宿费用的自定义函数，以便于财务管理。此外，提供的SQL脚本用于创建和初始化数据库，包括数据表的结构定义、初始数据的填充等。这一步骤是系统运行的基础，确保所有必要的数据和关系已经准备就绪。通过这个课程设计，学生不仅能学习到数据库的基本操作，还能掌握如何将这些知识应用于实际问题，提高解决问题的能力。同时，这个项目也锻炼了学生的团队协作能力和文档编写能力，因为实际开发过程中需要清晰的文档来记录设计思路和操作步骤，便于后期的维护和升级。总而言之，“学生公寓管理系统的设计与实现”是一个综合性的数据库实践项目，它涵盖了数据库设计、开发和管理的多个方面，是提升数据库技能的理想平台。通过这个项目，学习者可以全面理解数据库在实际应用中的重要性和实用性，为未来的信息系统开发打下坚实的基础。

随着高等教育的迅速发展，高校扩招导致学生规模的大幅增加，随之产生的学生成绩数据也急剧增长。如何从海量的学生成绩数据中提取有用信息，为教育决策提供支持，成为了教育管理部门亟待解决的问题。数据挖掘技术正是为了解决这一问题而应运而生的，它能够通过模式提取技术，从大量数据中发现隐藏的规律或数据间的关系，进而分析和提取有用的知识。数据挖掘技术在商业、医学等领域的成功应用，引起了教育管理领域的广泛关注。数据挖掘在教育管理中的应用主要集中在三个方面：首先是通过对学生成绩数据的挖掘，找出影响学生总体成绩的关键学科，通过加强对这些关键学科的教学管理，提高学生的关键学科成绩，从而间接促进其他学科成绩的提升；其次是通过对学生选课数据的挖掘，分析影响选课的因素，为科学合理的制定培养计划提供依据，并指导学生进行课程选择；最后是通过对学生就业数据的挖掘，揭示影响学生就业的关键因素，为就业指导提供决策支持。文章中提到，现阶段数据挖掘在教育行业的应用尚不成熟，专门用于高校学生成绩分析的数据挖掘软件还未出现。因此，本课题的目标是建立一个针对学生成绩的数据挖掘分析系统，以对高校本科生四年学制内的各科考试成绩进行全面分析，解决上述问题。为了实现这一目标，采用了软件工程中常用的瀑布式开发模型来设计和实现学生成绩分析系统，并遵循了CRISP-DM（Cross-Industry Standard Process for Data Mining，跨行业标准流程数据挖掘）标准流程来完成建模和模型解释。CRISP-DM是一个广泛认可的数据挖掘过程模型，该模型被划分为六个阶段：业务理解、数据准备、建模、评估和部署。按照这一流程，开发者能够系统地进行数据挖掘项目，从确定业务目标开始，直至最终的模型部署与监控。文章还提及，通过学生成绩数据的挖掘，本研究发现了两个重要结论：一是发现了相似学生的分群现象，这意味着可以通过学生的学习成绩对学生的群体进行有效分类，从而实施个性化的教学和管理；二是揭示了部分课程之间存在的相互依赖关系和相似关系，这有助于课程安排和教学内容的优化。在技术实现方面，学生成绩分析系统需要运用多种数据挖掘技术，例如聚类（Clustering）和关联规则（Association Rules）分析。聚类分析是一种无监督学习方法，它可以根据数据的相似性将对象划分到不同的组或“簇”中，使得同一个簇内的对象之

数据库课程设计知识点 一、项目背景与意义 1.1 开发背景随着信息技术的迅速发展，信息管理系统在各个领域都发挥着重要作用。尤其在图书馆这一传统而又重要的信息集散地，利用计算机技术进行图书资料管理不仅提高了工作效率，也大大提升了信息安全性和查询便捷性。 1.2 开发工具及环境- 开发工具：ASP（Active Server Pages）、Dreamweaver和SQL Server。- 开发环境：Windows 7操作系统、IIS（Internet Information Services）信息服务、SQL Server数据库管理系统。 二、需求分析 2.1 系统综合需求- 读者基本信息管理：输入、查询、修改读者信息，包括借书证编号、读者姓名等。- 书籍类别管理：制定书籍类别标准、输入/查询/修改类别信息，如类别编号、类别名称等。- 书籍库存信息管理：输入/查询/修改书籍库存信息，包括书籍编号、书籍名称、书籍类别、作者姓名、出版社名称、出版日期等。- 借书信息管理：输入/查询/修改借书信息，如读者借书证编号、书籍编号、借书日期等。- 还书信息管理：输入/查询/修改还书信息，如借书证编号、书籍编号、还书日期等。- 系统功能扩展：支持读者信息查询、添加及删除；支持书籍信息浏览、维护；支持借阅信息浏览及维护等。 2.2 系统逻辑模型- 数据流图：描述了系统的数据输入、处理和输出流程。- 数据字典：定义了系统中的各种数据元素及其属性，例如读者编号、姓名、图书编号、书名、图书种类等。 三、系统设计 3.1 概念结构设计- 实体关系图：用于表示图书馆管理系统中的实体及其之间的关系。实体可能包括读者、书籍、借阅记录等。- 数据模型：基于ER图建立数据库模型，明确各实体的数据结构和关系。 3.2 逻辑结构设计- 数据库表设计：根据实体关系图设计具体的数据库表结构，确保数据的一致性和完整性。- 索引设计：为提高查询效率，需要对关键字段进行索引设计。- 视图设计：为了简化用户操作，可设计视图来封装复杂的查询。 3.3 创建数据库及表- 数据库创建：使用SQL Server创建数据库及相关表。

雷达系统分析与设计，这本书是雷达的基本入门书籍，内含MATLAB源代码，使用起来比较方便。虽然有中文翻译，但存在很多错误，建议查看英文版！

The Online Exam Management System Design and Development is an innovative practice that combines modern information technology with the education sector. With the rapid development of network technology and remote education, such systems have become a focal point in the field of education. This article delves into the theory, technical background, system design methods, and implementation process of the online exam management system. Before system design, a thorough study of the current status of online exam management is necessary to evaluate its feasibility and necessity. This involves a needs analysis of educational institutions, including exam organization, question bank management, student management, grade statistics, etc. Through these analyses, the main goals of the system can be clarified, such as improving exam efficiency, reducing human errors, enhancing user experience, and ensuring fairness and security. In the system design phase, it is crucial to determine the operating model and architecture. The B/S (Browser/Server) architecture is adopted, allowing users to access the system through a web browser, which reduces client-side maintenance costs while enhancing the system's accessibility and cross-platform compatibility. A modular design method facilitates system scalability and maintenance by dividing system functions into independent modules, such as user management, question bank management, exam module, and grade management. During the implementation process, VP-UML is used as a modeling tool to create system requirement models, use case models, class models, and sequence diagrams, helping designers clearly express the system's design ideas. ASP.NET, as the development language, is an object-oriented, extensible programming technology based on the .NET Framework, capable of quickly building dynamic web applications. SQL Server 2005 serves as the backend database, providing data storage and management functionalities, supporting complex queries and transaction processing to ensure data security and consistency. The core functions of the online exam system include user registration and login, automatic paper generation, manual paper generation, online exam, auto-grading, and grade management. The user registration and login module ensures that only authorized users can participate in the exams. The automatic and manual paper generation functions can generate exams based on preset rules or teacher selections. The online exam module allows students to complete the electronic exam within a specified time and submit their answers in real time. The auto-grading feature quickly calculates grades based on set scoring rules. The grade management module stores, counts, and displays student exam results. In practical application, the system must also consider security and stability, such as preventing cheating, ensuring stable network connections, and implementing data backup and recovery mechanisms. Moreover, the system should offer a user-friendly interface and experience for easy operation. In conclusion, the online exam management information system, by combining advanced information technology, realizes the digitization and networking of exams, improving the efficiency and quality of exam management. Through proper design and implementation, it can meet the diverse needs of educational institutions in a remote education environment and promote the modernization of education.