中药材红外光谱鉴定方法     

何淑华  张洁  曲连颖  黄伟  刘晶  徐蔚青  陶艳春 《吉林大学学报(理学版)》1999,(4)

126种中药材,经适当的化学处理后,测定其红外光谱,并进行比较鉴别．为中药材真伪品的鉴别提供一种简便、可行的方法．  相似文献   

  总被引：2，自引：0，他引：2  

Zeng Junfang  Li Ran  Luo Jin  Luo Jin  Liu Yu 《系统工程与电子技术(英文版)》2009,20(3):577-582

Radio frequency identification (RFID) has prominent advantages compared with other auto-identification technologies. Combining RFID with network technology, physical object tracking and information sharing can possibly be carried out in an innovative way. Regarding open-loop RFID applications, RFID public services infrastructure (PSI) is presented, PSI architecture is designed, and service modules are implemented, and a demonstrative application system, blood management and traceability system, is studied to verify PSI. Experimental results show the feasibility of the proposed architecture and the usability of PSI framework software.  相似文献   

设置隶属度函数改善测量结果的判别策略     

魏保华  周星  杨锁昌  孟晨 《系统工程与电子技术》2005,27(6):1066-1068

针对传统的测量值判别策略中,由于误差量的影响造成误判率增加的问题,提出了一种设置隶属函数的判别策略。该策略通过设置适当的隶属函数,获得测量值属于各类别的隶属度,在不增加测量次数的情况下,可大大降低误判率。考虑了二元判别问题,从检测概率的角度,分析了这种策略的可行性。并结合实际问题给出了应用该策略的具体方法,给出了例证,仿真结果证明了该策略的有效性。  相似文献   

基于广义出行成本的出行方案优化     

胡盼  杨晓光 《系统工程理论与实践》2017,37(4):982-989

为了使出行成本更加符合出行者的认知规律,运用结构方程建模方法模拟出行成本,个体特征及出行决策之间的影响关系.引入敏感系数调整服务属性在出行成本中的贡献率,利用出行意愿调查数据对敏感系数进行标定.考虑出行者对抵达时刻的选择偏好,假设行程时间服从正态分布条件下,对最佳出发时刻及期望出行成本进行寻优求解,结果表明它取决于期望到达时刻,行程时间的期望值及方差,出行者对早到损失及晚到延误损失时间成本的相对大小.研究成果可为制定个性化及最优化出行决策方案提供依据.  相似文献   

一般系统结构理论及其应用（Ⅱ）   总被引：5，自引：0，他引：5  

林福永  吴健中 《系统工程学报》1997,12(4):11-20

在文献［１］的基础上首先通过对一般系统结构模型的数学分析，揭示一般系统原理及规律，从而从数学上取得一种新的面向问题、数学表达的一般系统理论，即一般系统结构理论；然后，应用一般系统结构理论研究一类专门系统——信息存储单元，包括：①推导存储单元结构模型；②揭示与存储单元工作速度有关的因子以及它与这些因子之间的数学关系；③提出改善存储单元工作速度的途径和方法．  相似文献   

INFORMATION CHARACTERIZATION OF COMMUNICATION CHANNELS FOR SYSTEM IDENTIFICATION     

Le Yi WANG G. George YIN 《系统科学与复杂性》2007,20(2):251-261

This paper studies identification of systems in which the system output is quantized, transmitted through a digital communication channel, and observed afterwards. The concept of the CR Ratio is introduced to characterize impact of communication channels on identification. The relationship between the CR Ratio and Shannon channel capacity is discussed. Identification algorithms are further developed when the channel error probability is unknown.  相似文献   

辨识智能作动器中迟滞非线性的两种方法     

李帆  赵建辉 《系统仿真学报》2008,20(5):1214-1217,1237

智能化是当今世界的发展趋势。智能材料结构作为研究热点之一,应用于航空、航天、生物及医药等诸多领域。智能作动器与智能传感器是智能材料结构的两个主要研究方向。迟滞现象是存在于大量智能材料中的非线性现象,对整个控制系统可能带来不良影响,如稳定性的恶化甚至丧失等。Preisach模型常用于智能材料中针对迟滞现象的建模。基于一阶滞回曲线获得智能作动器的输入输出数据,从理论上研究了经典Preisach模型两种工程上易实现的辨识方法,并应用到一种真实的智能作动器——WIDS-IA压电型作动器,仿真与实验结果表明,两种辨识方法均有效,且误差在同一数量级。为广泛存在迟滞非线性的智能作动器建模提供了理论依据,并具有工程实用价值。  相似文献   

  总被引：1，自引：0，他引：1       下载免费PDF全文

Wang Congsi  Bao Hong  Zhang Fushun  Feng Xingang 《系统工程与电子技术(英文版)》2009,20(4):726-731

The influence of the distorted plane of the active phased array antenna on the electromagnetic performance is of great significance to the research on and development of the high-performance antennas. On the bent and bowl-shape distortion, the model is established of the relationship between the electromagnetic performance and the position error of the radiated elements. The method is presented of analyzing the far-field pattern of the distorted rectangular active phased array antenna. The analysis results of a planar phased array antenna with different distortions grades prove the validity of the model. Therefore, by the method, the antenna designers may set the reasonable requirement on the structural tolerance in manufacturing antenna.  相似文献   

混沌通信的非线性N-shift加密与迭代学习辨识算法     

李世平  孙明轩  毕宏博 《系统工程学报》2011,26(2)

为增强混沌通信系统的保密性,讨论了非线性N-shift加密方案,从提高信号掩盖的非线性程度方面增强了混沌通信的保密性.利用迭代学习辨识方法来实现解密,完全重建信息信号,理论分析给出了学习算法关于初态误差和输出误差的鲁棒性和收敛性,推导出了学习算法关于非线性掩盖的收敛的充分条件.利用以上迭代学习辨识技术对采用复合非线性掩盖技术的蔡氏混沌通信系统进行仿真,结果说明迭代学习辨识算法可以完全重建信息信号,复合非线性掩盖具有高保密性.  相似文献   

    

Yiannis Laouris  Kevin Dye 《Systems Research and Behavioral Science》2024,41(2):368-389

The paper reviews the evolution of Interactive Management, later referred to as Structured Democratic Dialogue, starting from the early 1970s up to this date. The authors propose a generational classification scheme consisting of five periods based primarily on whether some or all stages of the process were implemented synchronously or asynchronously and whether the participants' presence was physical, virtual or hybrid. Other aspects such as modifications in the steps of the process; the evolution of the software; domains of applications; file management; methods of collecting or recording contributions, votes, clarifications and preparation of reports; and key players are also considered and reported within the context of the primary scheme. The paper considers key advances achieved at each generational stage in terms of process or software, discusses associated challenges and concludes with a view towards the future of the emerging fifth generation.  相似文献