Implementation of QAM Modulation Demodulation Based on Simulink

This paper is about Simulink QAM modulation and demodulation implementation. Firstly, the basic principle of QAM modulation and demodulation system is introduced. Then, the basic operation of system modeling and simulation under simulation software Simulink is introduced. The emphasis is on modeling and simulation of 16QAM system modules, and 16QAM modulation and demodulation are realized. Finally, a 2DPSK system simulation is carried out to compare it with the 16QAM system. It is concluded that 16QAM is a relatively superior modulation and demodulation system.

Analysis of Quality Factors of Online Video Streaming Based on Measurement

Spark is a low-latency, distributed computing system for large data sets. Spark is compatible with Hadoop data sources, but about 100 times faster than MapReducer, and is particularly well suited for machine learning. Spark is still in the embryonic stage, not yet high-speed development, with the Spark1.0.0 version of the release, marking the apache's top open source project Spark as a large data upstart, more and more attention by the IT industry will be widely used. Equipped with Spark platform and application of Spark to study the analysis of online video streaming media quality factors. This paper introduces the background knowledge of the research, and introduces and studies the composition and principle of Spark in detail. According to the needs of the experiment, the overall configuration of the platform is completed, its performance is verified, and its machine learning library is studied. First, we introduce the user requirements and architecture models of the widely accepted distributed file system in the industry. Then, the architecture of RDD is introduced. Finally, the relationship between the time of viewing video and the number of buffers is analyzed by KMeans machine learning algorithm, and the relationship of streaming media related factors is summarized. The platform used in the experiment is the Linux Ubuntu12.04LTS , the application is the Apache Spark platform. All the system preparation, debugging and testing are carried out in this experimental platform.

Assignment Algorithm of Computer Storage Management Partition and Its Implementation

This paper is about the algorithm of computer storage management partition and its implementation. First, we introduced the background and significance of the project, as well as the principle of technology used by the author in this project. This includes the principles of storage management, partition allocation technology and recycling technology. Then, a detailed analysis of the operating system primary storage allocation of a simple algorithm and one of its implementation., which mainly is to achieve a variable partition of the storage management allocation and recycling technology. Variable partition management usually uses a variety of methods, and our design are the first adaptive algorithm and the use of the best adaptive algorithm. Then it is followed by the test results of the system and discussion of its advantages and disadvantages. The entire storage management partition allocation algorithm and its implementation is entirely in accordance with the primary storage management of the operating system and effective use, in order to achieve a certain level of economic and technical value.

Lingyun online examination system

Online examination system is a collection of modern test theory, methods and modern information technology mean intelligent online examination system, make full use of the school's existing computer software and hardware resources and network resources to achieve paperless examination to make up for the lack of traditional manual examination. I mainly develop the system of the background management subsystem, which includes the trial management, test questions, online volume, and test paper management, arrange exams, check the exam rankings, and check the test scores and other functions.This paper describes the development process of online examination system, using B-S mode, using SSH (Struts+Spring+Hibernate) framework, JavaScript, Servlet, Ajax and other major technologies, the use of Oracle database, MyEclipse development tools. This paper mainly introduces the development process of an online examination system, including requirements analysis, data flow analysis, functional design, database design, system implementation, system debugging and testing.

Supermarket Management Information System

This article is mainly about the supermarket inventory management information system environment, function, the language used, the design of the program and other aspects of the content. It is mainly allow users to understand the system, so that they can use the system effectively, and allow the system to play its roles. The system uses computer management information technology, the establishment of the database, the supermarket inventory process to conduct a detailed analysis, to achieve the supermarket purchase, sales and inventory of scientific management. The system mainly includes the following major modules: Key In the invoices: Shipping, Warehousing, List of finished products; Query: Query on shipping and warehousing, Query on finished products list; Sales: Sales Costs Sales Refunds/Returns; Print Report: Warehouse Report, Outbound Report; Finished Product List Report: Sales Refund Report Return/Return Report.