HS code-driven landed cost estimation

List of the table of contents of this article:

• 1,HS code-driven landed cost estimation How to improve system maintainability
• 2, Where does the performance of the system, the reliability of the system, the scalability and maintainability of the system come from
• 3, What are the main factors affecting the maintainability of the system
• 4, The maintainability of the system refers to the ease of maintaining and modifying the system
• What are the features of the system

How to improve the maintainability of the system

Methods to improve the maintainability of software: reduce the coupling between system modules, and the system adopts component development and Web services; adopts mature technology development;Coding specifications, documents, etc.; maintenance manuals, advance inspection; strengthening system performance tests and evaluations; moderate redundancy in design.

In actual programming, you can organize programs by building blocks and stand on the shoulders of "giants" to achieve your goals. The object-oriented programming method makes the program structure clear and simple, improves the reusability of code, effectively reduces the amount of program maintenance, and improves the efficiency of software development.

Establish clear software quality goals; (2) Use advanced software development technologies and tools; (3) Establish clear quality assurance work; (4) Choose a maintainable programming language; (5) Improve program documents.

The evaluation indicators of system maintainability are understandable, testable and modifiable. Ways to improve the maintainability of the system: increase the system configuration interface and reduce manual background modification.Try to avoid system restarting and adopt technology that can be repaired in time. Add the system's regular self-checking procedures to prevent problems before they occur.

The appearance mode hides the complexity of the system by providing a simple interface. In this way, the client code can be simplified. Appearance mode can help us simplify the code structure and improve the readability and maintainability of the code. Flyweight mode is a mode used to share objects.

Use structured programming technology to improve the maintainability of existing systems. Using the method of spare parts, when you want to modify a module, replace the whole module with a new well-structured module. This method requires understanding the external (interface) characteristics of the replaced module, and you can not understand its internal work.

System performance, system reliability, system scalability And where does maintainability come from

1. Reliability: fault tolerance. In extreme cases, the system can also provide normal service capabilities. All types of faultsGeneral means: monitoring and alarm ability, melting and downgrading ability Scalability: The scalability of the system is mainly reflected in the dynamic expansion ability of cluster services.

2. Scalability is often confused with scalability. In the software category, it is the attributes of the software system itself, or further, the attributes of the design and the attributes of the code. Because we often talk about the scalability of design and the scalability of the code. It can also be said that the loose coupling of system design.

3. Application of VR indicators: VR indicators can be used to measure the performance of VR systems and evaluate the user experience, usability, security, performance, reliability and maintainability of VR systems. In addition, VR indicators can also be used to evaluate the scalability, maintainability and fault tolerance of VR systems, as well as the availability and reliability of VR systems.

4. Data security: Data is the core of the information system, so data security is an important factor that must be considered in design. This includes the considerations of data encryption, backup, recovery and leakage prevention.

5. It also has advanced management characteristics, such as thermal sensor, error checking and error correction (ECC), functional redundancy inspection, system management bus, etc. The functions of the Pentium IIXeon processor have also been enhanced to provide higher performance for performing a large number of computing tasks in a scalable and maintainable structure.

What are the main factors affecting the maintainability of the system

1. Fourth, friendly error prompts and friendly error prompts can help users find the cause and maintain the system by themselves.Fifth, perfect system configuration management needs to be carried out after the start of the project. Until the end of the project, it is still necessary to constantly update the system configuration information in the maintenance work.

2. According to the Bohm model, the factors that usually affect the maintainability of software are comprehensibility, testability and modifability. Understandability Understandability refers to the difficulty of maintenance personnel understanding the structure, interface, function and internal processes of the software. Testability Testability refers to the difficulty of testing and diagnosing software errors.

3. The factors that determine the maintainability of the software mainly include the following aspects: the quality of the system code. For example: the architecture of the software, the framework of the code and the specification of the programmer's code. Whether the structure of the code is reasonable, whether the variable naming is standardized, and whether the annotations in the code are detailed will all affect the maintenance cost of the system.

The maintainability of the system refers to the ease of maintenance and modification of the system

1. The maintainability of the system is the difficulty of measuring the repairability (recovery) and improveability of a system. Easy degree. The so-called repairability refers to the possibility of eliminating (or suppressing) the fault for repair after the system fails and returning to the original normal operating state.

2. Software maintainability is the difficulty of maintenance personnel maintaining the software, specifically including the difficulty of understanding, correcting, modifying and improving the software.

3. The maintainability of the system can be qualitatively defined as: the difficulty of maintenance personnel understanding, correcting, improving and improving the software.Improving maintainability is the key purpose of developing all steps of the management information system. Whether the system can be well maintained can be measured by the indicator of the maintainability of the system.

4. [Answer]: A The maintainability of the information system is a measure of the ease of maintenance of the information system. There are three main aspects that affect the maintainability of the system: comprehensibility, testability and modifierability.

What are the characteristics of the system

Dynamicity. First of all, the activities of the system are dynamic, and certain functions and purposes of the system are realized through the exchange of matter, energy and information with the environment. Therefore, the organized movement of matter, energy and information constitutes the dynamic cycle of systematic activities.

Self-examination managementScience books divide the characteristics of the system into: integrity, purpose, openness, exchange, interdependence and control.

Openness. The openness of the system refers to the accessibility of the system. This characteristic determines that the system can be recognized by the external environment, and the external environment or other systems can use the functions of the system or influence the behavior of the system in a predetermined way.

The concurrency of the operating system: refers to the running of multiple programs "simultaneously" in the computer system, which are macroscopically running simultaneously and alternately microscopically. Operating system and program concurrency are born together.