展性

The design considered the system as advanced, credible, exoteric and distensible, adopted the technology of database and graphical interfaces. So the system can be extended expediently and adapt the development in the future.

方案设计考虑了系统的先进性、可靠性、开放性和可扩展性，最大限度地采用数据库技术和图形窗口技术，使得系统结构扩展方便，能够较好地适应今后发展。

This thesis deeply researches the J2EE security strategy on the application tier of enterprise system. The security strategy predigests the information security model and meets the security requirements expediently. But there are some disadvantages when the security requirements become more complex. The expositive security on the Web-Tier can not offer more information for authentication; there is no authentication for EJB-Tier to use, make the EJB-Tier depend on the Web-Tier; J2EE uses database or application server to manage the role information. Use database to manage the role information will increase the complex of enterprise application, and the way of application server will reduce the ability of migrate other J2EE platform. To solve these problems, the thesis designs an improved security strategy model.

本文从企业级系统应用层安全的角度出发，深入研究J2EE多层体系结构的安全策略模型。J2EE提供的安全策略简化了系统的信息安全模型，能够很方便地满足基于J2EE的分布式应用系统的安全需求，但是在面对更加复杂的安全需求时，J2EE安全策略在验证授权和角色管理中还存在不足之处：其在Web层的声明式验证机制无法为用户提供更多验证信息，可扩展性较差；在EJB层缺少业务逻辑层可供采用的验证机制，而是借助于Web层的验证机制，其耦合程度较高有悖于业务逻辑分离于表现逻辑的原则；在角色管理方面，J2EE采用数据库或者应用服务器来管理角色信息，其中，数据库管理角色的方式增加了应用开发的复杂度，应用服务器管理角色降低了系统的可移植性，两者都具有片面性。

The system uses C/S structure, the function extendibility quite is good.

系统采用C/S结构，功能的可扩展性比较好。

With the theory of hierarchy, the system is full of extendibility, and offers the convenient experience.

而且由于通信协议体现了分层的思想，本系统在以后进一步的开发过程中具有充分可扩展性，给客户带来的真切的方便体验。

The viability and extendibility of the system is validated both by simulation and field test.

通过对V -traffic系统的现场测试及对该系统核心分发算法的仿真测试，验证了系统的实用性与可扩展性。

The application of MVC mode in software design can improve the extendibility, maintainability and reusability of the code.

采用MVC软件设计模式能够有效的提高软件的可扩展性、可维护性和代码复用率。

Due to the nature of its excellent extendibility, LabVIEW ensures the integrity of the software and the completion of the whole system.

LabVIEW具有的优秀的可扩展性，也为软件的完善和整个系统的最

It's proved that with such design patterns compact structure, high reliability and extendibility of the system can be realized.

结果表明：采用此类方法可实现系统结构合理化，提高系统可靠性，增强系统的扩展性。

This redesign solution has good openness,extendibility and high performance,low cost,so it has a very good promoted prospect.

该设计方案具有良好的开放性、可扩展性及高性能、低成本等特点，因此具有广泛的应用前景。

Its primary purpose is to report on and fix problems, but its flexibility and extendibility evoke many other uses limited only by your imagination.

其主要目的是报告和修理问题，但是其灵活性和可扩展性唤起了许多其他在你脑海中受限的用途。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。