L1-norm based null space discriminant analysis

Multimedia Tools and Applications - Null space based linear discriminant analysis (NSLDA) is a well-known feature extraction method, which can make use of the most discriminant information in the...     

Visual topic discovering,tracking and summarization from social media streams

Multimedia Tools and Applications - Nowadays, microblogging has become popular, with hundreds of millions of short messages being posted and shared every minute on a variety of topics in social...     

iOS application for quadrotor remote control

With the progress of electronics technology, the development of civilian UAV (unmanned aerial vehicle) applications becomes possible. In addition, smartphones have rapidly gained popularity and become very important due to the simple operability and mobility. Hence, there is a need to have an easy and flexible way to control a UAV using such technology. In this study, a remote controller using an iOS device is developed for a quadrotor to enable remote control with easy operations. Four basic programs for obtaining compass information, controlling a gimbal, autopilot function for return, and video preview function are developed and implemented for an iOS device. The basic functionalities of the programs are evaluated and confirmed through experiments using a quadrotor and an iOS device.     

Efficient identity-based online/offline encryption and signcryption with short ciphertext

The technique of online/offline is regarded as a promising approach to speed up the computation of encryption, because the most part of computation, such as pairing over points on elliptic curve and exponentiation in groups, can be pre-computed in the offline phase without knowing the message to be encrypted and/or recipient’s identity. The online phase only requires light computation, such as modular multiplication. In this paper, we propose two novel identity-based online/offline schemes: a full secure identity-based online/offline encryption scheme and an identity-based online/offline signcryption scheme. Compared to the other schemes in the literature, our schemes achieve the shortest ciphertext size in both offline and online phases and demonstrate the best performance in offline computation. Our schemes are applicable to devices with limited computation power. They are proven secure in the random oracle model.     

Optimization for limited angle tomography in medical image processing

This paper aims to reduce the problems of incomplete data in computed tomography, which happens frequently in medical image process and analysis, e.g., when the high-density region of objects can only be penetrated by X-rays at a limited angular range. As the projection data are available only in an angular range, the incomplete data problem can be attributed to the limited angle problem, which is an ill-posed inverse problem. Image reconstruction based on total variation (TV) reduces the problem and gives better performance on edge-preserving reconstruction; however, the artificial parameter can only be determined through considerable experimentation. In this paper, an effective TV objective function is proposed to reduce the inverse problem in the limited angle tomography. This novel objective function provides a robust and effective reconstruction without any artificial parameter in the iterative processes, using the TV as a multiplicative constraint. The results demonstrate that this reconstruction strategy outperforms some previous ones.     

铁路线路智能CAD(IRLCAD)系统中的三维景观动态仿真

铁路线路是大地上长大带状建筑物。自然环境和既有的人工建筑对线路走向的规划起着根本性的作用。在计算机上用三维景观动态仿真技术模拟现实环境,让工程师动态地对规划线路经行地区的环境进行观察和分析,从而作出线路走向决策,将是一种理想的设计境界。介绍了铁路线路智能CAD系统中的三维景观动态仿真技术。     

有机化合物立体异构体自动解析专家系统的研究——立体中心的确认

提出了一种查找化合物中立体中心的算法 ,通过该算法可以找到和确认化合物中由于不对称碳和碳碳双键等产生的所有的立体中心。     

一个实用的面向中小型企业的产品数据管理系统

介绍了一个面向中小型企业的产品数据管理系统SMPDM。它是一个建立在PDM基本框架之上,集产品结构与配置管理、图档管理、工艺卡片管理及编码管理为一体的实用系统。它实施简单,见效快,是管理中小型企业产品数据的良好工具。     

对MMI质量流量计计量系统通信故障的处理

武汉石油化工厂计量办检测站于１９９５年５月投用了一套用于成品油水路出厂计量的质量流量计微机计量系统,运行两年多,工厂的成品油出厂损耗逐年下降（目前实际出厂损耗率已经控制在１０．１％以内,远远低于±０．３％的国家标准）,用户索赔情况日趋减少,取得了较好的经济效益和社会效益。其后,该系统的通信部分突发故障,计算机无法采集流量计的数据,造成系统停用。我们经过认真检测、分析,终于排除了故障,保证了成品油出厂计量。具体介绍如下,供交流。１系统简介 检测站毗邻我厂的长江码头,进出厂的油品管线均经过此地。按规…