March 9 Jobs

. Year March 9 Job

1 , what are the characteristics of information system integration?

1 ), to meet user needs as the fundamental starting point;

2 not only equipment selection and supply, it is a high-tech engineering process, to provide users with comprehensive solutions, its core is software;

3 System Integration The final deliverable is a complete system rather than a discrete product;

4 system integration, including technical, management and business work, is a comprehensive system engineering, technology is the core of information system integration work, management and business activities are the guarantee of successful implementation of the project.

2 , what stages are included in the development phase of the information system lifecycle?

The development stage is divided into 5 stages, the Master planning stage, the system analysis stage, the system design stage, the system implementation stage and the system acceptance stage, mainly is the design and the coding stage.

3 , four kinds of software maintenance and applicable conditions?

1 ) Troubleshooting (corrective) Maintenance: After the software is delivered, correct the problems found;

2 Adaptive Maintenance: After the software is delivered, the SOFTWARE product can continue to be used in a changing or changing environment.

3 Perfect maintenance: After software delivery, improve performance and maintainability.

4 Preventative maintenance: After software delivery, detect and correct potential errors in software products before they become actual errors.

4 , the Unified Modeling Language UML features?

1 ) is not a visual programming language, but a visual modeling language;

2 ) is a modeling language specification, is a standard representation of object-oriented analysis and design;

3 ) is not a process, nor a method, but allows any process and method to use it;

4 ) Simple and extensible, with an extended and specialized mechanism that eliminates the need to modify core concepts;

5 provides support for advanced concepts emerging in object-oriented design and development, emphasizing the reuse of frameworks, architectures, patterns, and components in software development;

6 integration with the best software engineering practice experience.

5 , several common software architecture patterns and characteristics?

1 Pipe/Filter Mode: Features a black box that embodies each function module, high cohesion and low coupling. Cons: Designers need to coordinate two relatively independent, but relational, data streams.

2 Object-oriented mode: its typical application is architecture-based software development, the advantage is highly modular, the disadvantage is that the object before the call needs to know the identity of the called object, if the identity changes, it is necessary to notify all calls to the object, or the system will not function properly.

3 Event-driven mode: The basic principle is that a component does not invoke a procedure directly, but instead triggers one or more events. The main feature is that the event's trigger does not know which artifacts are affected by the event, and does not assume the order in which the artifacts are processed, or even what processes are called. Mainly have word,excel and so on.

4 Hierarchical mode: Typical applications are layered communication protocols, such as the Iso/osi seven-tier network model. The advantage is to simplify complex problems. Disadvantage is that each system bad points, and the number of levels too many, system performance degradation.

5) Knowledge Base mode: Two different control strategies, if the input stream triggers the selection of the process execution, is based on the traditional database type Knowledge Base mode, or if the current state of the central data structure triggers the process execution selection, is based on the blackboard mode Knowledge Base mode. The typical blackboard system is the field of signal processing, such as speech and pattern recognition, blackboard system mainly has knowledge source, blackboard data structure and control three parts

6 client/Server mode: is based on the resource is not isosceles triangle, will be applied in Split, the server is responsible for data processing, the foreground to complete the interaction with the user task. C/s mode is suitable for distributed system, in order to solve the client problem in C/S mode, the browser/server/b/s mode is formed, in order to solve the server problem in C/S mode, a three layer (multilayer) C/s mode is formed, that is, multi-layer application architecture.

6 , typical techniques and characteristics of webservices, and what are the conditions applicable to webservices?

Web Typical technologies for services include: Simple Object Access Protocol (SOAP) for passing information, Web Service Description Language (WSDL) for describing services, unified description of registration for Web services, Discovery and Integration (UDDI), XML for data exchange

Web The main objectives of the service are cross-platform interoperability, where the following applies: Spanning firewalls, application integration, business-to-business integration, and software reuse.

7 , computer network knowledge, network storage mode and their respective characteristics?

1 DAS: Direct-attached storage, typically via a standard interface that connects the storage server directly to the server.

2 NAS: Network-attached storage that connects storage devices to a range of computers through a standard network topology, Plug and Play.

3 SAN: A storage area network that uses high-speed fibre channel as a network storage technology for transmission media with extreme scalability, simplified storage management, optimized resource and service sharing, and high availability.

March 9 Jobs