Maximum likelihood interval-varying recursive least squares identification for output-error autoregressive systems with scarce measurements

The identification problem of output-error autoregressive (OEAR) systems with scarce measurements is considered in this paper. In order to overcome the massive absence of outputs, an interval-varying recursive identification algorithm is proposed through changing the sampling interval and skipping the missing outputs. Based on the maximum likelihood principle, a maximum likelihood interval-varying recursive least squares algorithm is proposed. The effectiveness of the proposed algorithm is tested by a numerical simulation example, and an application example about the heading motion control of underwater vehicle.     

草乌中有毒生物碱的提取分离

针对药材中乌头碱、中乌头碱、次乌头碱的提取分离方法进行了研究,本方法提取回收率与碱性苯溶液提取方法相似.方法中所用试剂成本低毒性小,适用于乌头碱、中乌头碱、次乌头碱的提取分离以及对照品的制备。     

Automatic keyword identification by artificial neural networks compared to manual identification by users of filtering systems

Information filtering (IF) systems usually filter data items by correlating a vector of terms that represent the user profile with similar vectors of terms that represent data items. Terms that represent data items can be determined by experts or automatic indexing methods. In this study we employ an artificial neural network (ANN) as an alternative method for both IF and term selection and compare its effectiveness to that of “traditional” methods. In an earlier study we developed and examined the performance of an IF system that employed content-based and stereotypic rule-based filtering methods in the domain of e-mail messages. In this study, we train a large-scale ANN-based filter, which uses meaningful terms in the same database as input, and use it to predict the relevance of those messages. Our results reveal that the ANN relevance prediction out-performs the prediction of the IF system. Moreover, we found very low correlation between the terms in the user profile (explicitly selected by the users) and the positive causal-index (CI) terms of the ANN, which indicate the relative importance of terms in messages. This implies that the users underestimate the importance of some terms, failing to include them in their profiles. This may explain the rather low prediction accuracy of the IF system.     

Dielectrophoresis of DNA: Quantification by impedance measurements

Dielectrophoretic properties of DNA have been determined by measuring capacitance changes between planar microelectrodes. DNA sizes ranged from 100 bp to 48 kbp, DNA concentrations from below 0.1 to 70 μg∕ml. Dielectrophoretic spectra exhibited maximum response around 3 kHz and 3 MHz. The strongest response was found for very long DNA (above 10 kbp) and for short 100 bp fragments, which corresponds to the persistence length of DNA. The method allows for an uncomplicated, automatic acquisition of the dielectrophoretic properties of submicroscopical objects without the need for labeling protocols or optical accessibility.     

The illegal body: `Eurodac' and the politics of biometric identification

Biometrics is often described as `the next big thingin information technology'. Rather than IT renderingthe body irrelevant to identity – a mistaken idea tobegin with – the coupling of biometrics with ITunequivocally puts the body center stage. The questions to be raised about biometrics is howbodies will become related to identity, and what thenormative and political ramifications of this couplingwill be. Unlike the body rendered knowable in thebiomedical sciences, biometrics generates a readable body: it transforms the body's surfaces andcharacteristics into digital codes and ciphers to be`read' by a machine. ``Your iris is read, in the sameway that your voice can be printed, and yourfingerprint can be read', by computers that, in turn,have become ``touch-sensitive', and endowed with seeingand hearing capacities. Thus transformed into readable``text', the meaning and significance of the biometricbody will be contingent upon ``context', and therelations established with other ``texts'. Thesemetaphors open up ways to investigate the differentmeanings that will become attached to the biometricbody and the ways in which it will be tied toidentity. This paper reports on an analysis of plans andpractices surrounding the `Eurodac' project, aEuropean Union initiative to use biometrics (specif.fingerprinting) in controlling illegal immigration andborder crossings by asylum seekers.     

技术创新风险管理的分类与识别

技术创新的不确定性决定了技术创新高风险的特征 ,企业对技术创新的风险进行科学系统的管理对创新成功具有重要意义。而技术创新风险管理的首要任务便是风险识别 ,本文将可能的技术创新风险归为决策风险、技术风险、市场风险、组织风险、资金风险、信息管理风险、企业文化风险、外部环境风险共八类 ,可以帮助企业有效地进行风险的识别 ,从而采取对策 ,尽可能降低可能的损失、增加可能的收益     

Bilinear system identification by block pulse functions

A new method is employed to identify the unknown parameters of a bilinear system. This method expands the system input and output by block pulse functions and reduces the original identification problem to an algebraic form. Furthermore, the dyad formed by block pulse functions and its integral are in diagonal forms, whereas the integration of the “triple-product” matrix can be reduced to the upper triangular form. Consequently, only very few calculations are required to find the solution for the algebraic equation. Two examples are given to show that the use of this method is considerably more economical in computation time than the use of Walsh function expansion.     

我市指纹自动识别系统在侦查破案中的作用

指纹自动识别系统的建立,标志着刑事技术的大跃进,增加了刑事技术的科技含量,大大缩小了比对时间,在侦查破案中发挥重要的作用.本文论述了指纹自动识别系统在侦查破案中的作用,并提出了存在的问题.     

基于属性综合评价系统的新兴技术识别研究

摘要：新兴技术对经济、社会发展产生的重要作用,已逐步为各国政府和管理学界所公认。要投资新兴技术,首先要对其进行识别,以及评价和选择,然而新兴技术的高度不确定性和创造性毁灭特性给新兴技术的识别、评价和选择带来了巨大挑战。本文利用在属性集和属性测度理论基础上提出了属性综合评价和决策系统,对一组技术进行了判别,进而对其进行了分类,以求找出其中的新兴技术,为新兴技术的评价和选择,以及新兴技术的最终商业化和产业化奠定了坚实基础。     

Velocity field control of robot manipulators by using only position measurements

In the velocity field control approach the robot motions are specified through a vectorial function that assigns the desired velocity to each point of the configuration space. In other words, a velocity field defines the robot desired velocity in the operational space as a function of its current position. In this paper is introduced a new algorithm to solve the velocity field control formulation in the robot operational space. The proposed approach assumes only joint position measurements and is based on a hierarchical structure that results of using the kinematic control concept and a joint velocity controller. To estimate the joint velocity, nonlinear filtering of the joint position is used.     

基于战略联盟的相互信任问题探讨

战略联盟内的互相信任问题是战略联盟取得成功的最重要的环节，大量战略联盟的失败都可以归结为互相信任问题。文章探讨和剖析了企业战略联盟内部成员企业在组建和运转过程中的相互信任问题，并提出了建立相互信任机制的各种有效措施。     

现金流量表的粉饰与识别

现金流量表在公司的经营管理与投资者的投资分析与决策中越来越发挥重要作用,因此报表编制者采取了多种方法进行粉饰。特别是对经营活动产生的现金流量、投资活动产生的现金流量、筹资活动产生的现金流量进行粉饰,就其粉饰的手段和识别方法加以探讨。     

Direct measurements of the frequency-dependent dielectrophoresis force

Dielectrophoresis (DEP), the phenomenon of directed motion of electrically polarizable particles in a nonuniform electric field, is promising for applications in biochemical separation and filtration. For colloidal particles in suspension, the relaxation of the ionic species in the shear layer gives rise to a frequency-dependent, bidirectional DEP force in the radio frequency range. However, quantification methods of the DEP force on individual particles with the pico-Newton resolution required for the development of theories and design of device applications are lacking. We report the use of optical tweezers as a force sensor and a lock-in phase-sensitive technique for analysis of the particle motion in an amplitude modulated DEP force. The coherent detection and sensing scheme yielded not only unprecedented sensitivity for DEP force measurements, but also provided a selectivity that clearly distinguishes the pure DEP force from all the other forces in the system, including electrophoresis, electro-osmosis, heat-induced convection, and Brownian forces, all of which can hamper accurate measurements through other existing methods. Using optical tweezers-based force transducers already developed in our laboratory, we have results that quantify the frequency-dependent DEP force and the crossover frequency of individual particles with this new experimental method.     

法医学鉴定工作中尊重原则的调查分析研究

目的:了解云南省在岗民警对法医伦理学中尊重原则的认识及看法,并对法医学鉴定工作中尊重原则提出一些初步探讨。方法:对云南省部分地区民警在自己工作中的行为进行问卷调查。结果:(1)在警察对疑犯进行法医学检验和鉴定时,认为"需要尊重其人格尊严"者占调查总人数的93.5%。(2)在被调查民警群体中,不认可尸检过程中有"动作较大"的占87%。结论:民警在日常工作中需要尊重被鉴定人,以避免任何形式后期双方之间的矛盾。