工装夹具增强装配技术研究应用

为了减少装配操作步骤和提高装配准确度和效率,在现有CAD软件装配功能的基础上提出一种基于装配特征识别的增强装配算法,利用特征识别以及定义的特征之间的装配关系实现增强装配功能,进而能实现装配的自动化。基于该算法实现的增强装配系统具有良好的扩充性,在实际装配应用中提高CAD软件装配功能的效率。     

校务系统中的Web服务应用

从拓展校务系统的角度,介绍了 Web服务在校务系统中的理论模型和实现方法.     

基于BREW平台的嵌入式Java虚拟机研究与实现

在深入研究了BREW和J2ME的实现原理及应用开发机制的基础上,实现了BREW平台的Java扩展,使得在BREW平台上运行Java应用程序成为可能.     

A preliminary attempt to use radiomic features in the diagnosis of extra-articular long head biceps tendinitis

Magnetic Resonance Materials in Physics, Biology and Medicine - This study aims to present a radiomic application in diagnosing the long head of biceps (LHB) tendinitis. Moreover, we evaluated...     

Adaptive fault-tolerant control for a class of flexible air-breathing hypersonic vehicles

In this paper, a novel adaptive fault-tolerant control (FTC) scheme is proposed for a class of flexible air-breathing hypersonic vehicles with unknown inertial and aerodynamic parameters and even input constraints. The fault model under consideration covers the case that all actuators suffer from unknown time-varying faults. In the controller design and stability analysis, we introduce new Lyapunov functions, some differentiable auxiliary functions, a bound estimation approach, and a Nussbaum function, which help us successfully circumvent the obstacle caused by the faults, input constraints, and flexible modes. In addition to higher reliability, the proposed scheme is able to ensure that all closed-loop signals are globally uniformly bounded and to steer the tracking errors of altitude and velocity into predefined arbitrarily small residual sets. As a result, the tracking accuracy can be designated in advance. Simulation results illustrate the effectiveness of the proposed scheme.     

Complex and flexible data access policy in attribute-based encryption

The Journal of Supercomputing - With the development of cloud computing application, attribute-based encryption (ABE) with flexibly fine-grained data access control is widely adopted. However,...     

Neural network-based robust finite-time attitude stabilization for rigid spacecraft under angular velocity constraint

Neural Computing and Applications - In this paper, the problem of attitude stabilization control of spacecraft under angular velocity constraint is investigated. A state-constrained finite-time...     

加强计量信息化建设,提高企业计量管理水平

网络化的计量管理信息系统在技术上的实用性和维护性上面都有其可靠性,对计量管理工作采用信息化管理可以真正实现完全意义上的信息共享,使我们管理的计量装置、计量器具准确可靠的运行。     

DES加密算法在秘密共享中的应用

秘密共享思想提出后,经过几十年的发展已经出现了很多不同方案、模型等。本文根据秘密共享的特性提出了一种基于对称密钥系统的秘密共享方案。该方案解决了一些秘密共享现有的问题的,尤其是可验证性。存储在密钥分发者的信息都是加密后的密文,因此,其抗攻击的强度就是使用的加密算法的强度。通过简单C＋＋程序实现这一方案。对方案的可行性进行分析。