基于网络化虚拟仪器的通信测试系统的实现

网络化虚拟仪器的使用可以大大提高通信测试设备的利用率,增加通信测试的灵活性。通过分析和比较各种虚拟仪器及网络化虚拟仪器系统的组建模式的特点,结合某卫星测控站现有通信测试系统的实际结构,选择基于HPVEE和三层C/S网络的虚拟仪器作为构建网络化虚拟仪器通信测试系统的基础,对系统网络软硬件进行设计,实现基于网络化虚拟仪器通信测试系统,完成该测控站从单一的通信测试操作单位向通信测试平台和通信测试软件研发中心的转变,并可为类似需求提供有效的技术支持。     

Enhanced security in internet voting protocol using blind signature and dynamic ballots

In this paper, we introduce an internet voting protocol which satisfies desired security requirements of electronic voting. In the newly proposed protocol, we allow the adversaries to get more power than in any previous works. They can be coercers or vote buyers outside, and corrupted parties inside our system. These adversaries also have ability to collude with each other to ruin the whole system. Our main contribution is to design an internet voting protocol which is unsusceptible to most of sophisticated attacks. We employ the blind signature technique and the dynamic ballots instead of complex cryptographic techniques to preserve privacy in electronic voting. Moreover, we also aim at the practical system by improving the blind signature scheme and removing physical assumptions which have often been used in the previous works.     

Analyzing sentiments in Web 2.0 social media data in Chinese: experiments on business and marketing related Chinese Web forums

Web 2.0 has brought a huge amount of user-generated, social media data that contains rich information about people’s opinions and ideas towards various products, services, and ongoing social and political events. Nowadays, many companies start to look into and try to leverage this new type of data to understand their customers in order to make better business strategies and services. As a nation with rapid economic growth in recently years, China has become visible and started to play an important role in the global business and economy. Also, with the large number of Chinese Internet users, a considerable amount of options about Chinese business and market have been expressed in social media sites. Thus, it will be of interest to explore and understand those user-generated contents in Chinese. In this study, we develop an integrated framework to analyze user sentiments from Chinese social media sites by leveraging sentiment analysis techniques. Based on the framework, we conduct experiments on two popular Chinese Web forums, both related to business and marketing. By utilizing Elastic Net together with a rich body of feature representations, we achieve the highest F-measures of 84.4 and 86.7 % for the two data sets, respectively. We also demonstrate the interpretability of Elastic Net by discussing the top-ranked features with positive or negative sentiments.     

成都市水资源利用“木桶”效应的量化分析

为了从经济学角度,量化分析水资源对成都市经济发展的约束效应以及国民经济各部门的用水特性,借用“木桶”原理,运用经济学发展理论和投入产出技术,对成都市水资源的“矮板效应”、“高板效应”和“疏板效应”进行分类计算分析。结果表明：目前水资源还不是约束成都市经济发展的“瓶颈”资源,但在时间和空间上,其约束程度表现出一定的差异性;农业、餐饮业等部门浪费水资源较严重,用水量与城市化水平还未呈现合理的倒“U”形关系;水资源在各部门间配置还欠合理,在建筑业、文化娱乐和房地产业等配置较多,而对交通运输、工业和金融业等配置较少。     

Robust Fault‐Tolerant Control of Launch Vehicle Via GPI Observer and Integral Sliding Mode Control

A robust fault‐tolerant attitude control scheme is proposed for a launch vehicle (LV) in the presence of unknown external disturbances, mismodeling dynamics, actuator faults, and actuator's constraints. The input‐output representation is employed to describe the rotational dynamics of LV rendering three independently decoupled second order single‐input‐single‐output (SISO) systems. In the differential algebraic framework, general proportional integral (GPI) observers are used for the estimations of the states and of the generalized disturbances, which include internal perturbations, external disturbances, and unknown actuator failures. In order to avoid the defects of the conventional sliding surface, a new nonlinear integral sliding manifold is introduced for the robust fault‐tolerant sliding mode controller design. The stability of the GPI observer and that of the closed‐loop system are guaranteed by Lyapunov's indirect and direct methods, respectively. The convincing numerical simulation results demonstrate the proposed control scheme is with high attitude tracking performance in the presence of various disturbances, actuator faults, and actuator constraints.     

蜂王浆产品中10-羟基-2-癸烯酸的含量稳定性研究

10-羧基-2-癸烯酸(10-HDA)是蜂王浆特有的不饱和脂肪酸,在其质量标准中特别规定了其含量要求。采用纳米技术制备纳米脂质体可提高其稳定性,本文以包封率为评定指标,采用乙醇注入-超声法制备了10-HDA纳米脂质体,并用液相色谱测定其中的10-HDA含量,比较了五种蜂王浆产品中10-HDA的含量稳定性。结果发现,10-HDA纳米脂质体包封率可达98.3%,同时其含量最为稳定,而其它四种蜂王浆产品中10-HDA含量不稳定,随着时间的延长呈下降趋势。     

Holistic and partial facial features fusion by binary particle swarm optimization

This paper proposes a novel binary particle swarm optimization (PSO) algorithm using artificial immune system (AIS) for face recognition. Inspired by face recognition ability in human visual system (HVS), this algorithm fuses the information of the holistic and partial facial features. The holistic facial features are extracted by using principal component analysis (PCA), while the partial facial features are extracted by non-negative matrix factorization with sparseness constraints (NMFs). Linear discriminant analysis (LDA) is then applied to enhance adaptability to illumination and expression. The proposed algorithm is used to select the fusion rules by minimizing the Bayesian error cost. The fusion rules are finally applied for face recognition. Experimental results using UMIST and ORL face databases show that the proposed fusion algorithm outperforms individual algorithm based on PCA or NMFs.     

Delphi环境下目标规划图解法算法程序的开发

作为目标规划算法平台的一个重要组成部分,研究了多目标线性规划中的目标规划图解法算法程序的开发,以方便该方法在各领域的应用。首先,介绍了目标规划的原理、建立目标规划模型的步骤。然后,介绍目标规划图解法的计算步骤以及在Del-phi环境下开发目标规划图解法的流程和具体方法。最后,通过实例对目标规划图解法算法程序的正确性进行了验证。所开发的算法程序直观简捷,方便工程人员的使用。     

一种基于DSP的数据采集与显示设计方案

为了快速、准确地进行数据采集,并把采集到的数据显示出来,设计了一种以TI公司的TMS320F2812内置ADC为数据采集核心、以MAXIM公司的MAX7219作为LED显示驱动的方案.从硬件和软件两个方面的设计进行阐述,重点介绍了软件方面的设计.调试结果证明,该设计能够达到数据采集的要求,并能稳定地显示采集到的数据,可以广泛应用于仪器仪表设计中.     

数据库应用系统的建模研究

介绍了当今的软件建模发展现状及UML的建模框架和策略,并针对高校机房计费系统的实例,讲解与RUP相容的建模框架,给出了基于UML的数据库应用系统建模的整体设计流程。