一种Agent的偏好系统及其建立

受到Agent偏好模型的启发,提出了一个新的描述人们行为的偏好系统称为AF系统,它将Michael Freund的理性偏好推理与Adams提出的经典的归纳逻辑和概率逻辑相结合,即借助经典的逻辑系统,把人们的逻辑推理和以人们的偏好取向为基础的常识性推理以及以主观愿望为基础的意向推理结合在一起成为一个有机系统,并且在这个系统下提出Agent的理性偏好的建立方法以及推理步骤.最后给出一个实例,说明它能根据人们的部分愿望,全面估计人们的偏好走向,而且一旦人们的基本态度有所转向,偏好结构也可做相应调整,无需做根本改动,因此它具有鲁棒性和实用价值.     

两阶段多供应商选择采购模型

针对如何从众多供应商中选择出适合需求的供货商进行准时采购这一问题,提出两阶段多供应商选择采购模型。利用层次分析方法对各个供应商按照定性准则进行分析评价,利用定量准则所建立的多供应商选择采购的成本优化模型对初步选择的供应商做进一步选择,从而确定最终的供货商及供货数量。实际应用结果表明,该模型不但能使企业选择出符合要求的供货商,而且能使企业降低采购成本和产品成本。     

NTRU参数选择方法的研究

NTRU算法是一种基于环的公开密钥体制,与RSA和ECC等典型的加密算法相比,在安全性和速度方面具有明显的优势。分析目前比较成熟的攻击NTRU方法,从安全的角度,根据不同的应用场合,给出NTRU加密参数选择方法,减少选择NTRU参数的盲目性,达到提高算法的执行速度、减少占用系统资源的目的。     

Simultaneous state estimation and parameter identification in linear fractional order systems using coloured measurement noise

In the present paper, the identification and estimation problem of a single-input–single-output (SISO) fractional order state-space system will be addressed. A SISO state-space model is considered in which parameters and also state variables should be estimated. The canonical fractional order state-space system will be transformed into a regression equation by using a linear transformation and a shift operator that are appropriate for identification. The identification method provided in this paper is based on a recursive identification algorithm that has the capability of identifying the parameters of fractional order state-space system recursively. Another subject that will be addressed in this paper is a novel fractional order Kalman filter suitable for the systems with coloured measurement noise. The promising performance of the proposed methods is verified using two stable fractional order systems.     

SODA: A new method of in-scene atmospheric water vapor estimation and post-flight spectral recalibration for hyperspectral sensors: Application to the HyMap sensor at two locations

A new method of estimating per-pixel atmospheric column water vapor (ACWV) and potential differences in the reported band center wavelengths of the HyMap sensor has been developed. The new method uses variations of a second order derivative algorithm (SODA) to assess the impact of atmospheric residual features on calculated surface reflectance spectra after atmospheric compensation. The SODA method provides an alternative to the current band ratio techniques of ACWV estimation and also allows the same form of algorithm to be used for the estimation of possible band shifts. A comparison of in-situ measured surface reflectance at two field sites in Western Australia demonstrates improvement in the resulting spectra when post-flight updates are made to the reported HyMap band center wavelengths and applied during the atmospheric compensation process. The same SODA methodology was varied to estimate the ACWV on a per-pixel basis and found to significantly reduce the appearance of the underlying surface structure on the resulting ACWV images as well as improve the overall accuracy of the estimation. The ACWV estimated from the HyMap imagery at the two field sites was found to agree with in-situ atmospheric ACWV measurements to within 2% and represented a two fold increase in accuracy over a 3 band ratio Continuum Interpolated Band Ratio (CIBR) technique of ACWV estimation.     

单件小批量生产排产逆序递推法应用研究

针对单件小批量型生产企业,为了保证交货期和控制原材料、在制品库存,提出一种生产排产算法--逆序递推算法.本文在算法中考虑到了生产扰动对交货期的影响,并结合实例作出逆序递推排产甘特图来指导生产.     

基于UDP传输协议的包丢失和失序处理

UDP是互联网上多媒体数据传输采用的主要传输协议。其主要特点是网络开销低但传输不可靠,易产生包丢失或失序。为了对失序数据包进行重排序,应用程序需要预留一个适当的缓冲区以存储期望包到达之前的数据包。该文分析了数据包丢失或失序情况下,缓冲区大小对系统性能的影响,给出了缓冲区大小的一个估计值,并对失序或数据包丢失情况下数据处理的策略进行了讨论。     

有限构模器的扩展及其在形式化方法中的应用

规约在软件开发和验证中占有重要地位,对于以一阶逻辑为基础的规约,可以利用有限模型构造技术对其执行并测试,文中研究规约中某些特性的处理,包括存在量词以及二元关系析传递闭包,对已有的一个构模工具进行扩充,发现了文献中的若干错误。     

High Order Schemes for Resolving Waves: Number of Points per Wavelength

For energetic flows there are many advantages of high order schemes over low order schemes. Here we examine a previously unknown advantage. It is commonly thought that the number of points per wavelength in order to obtain a given error in a numerical approximation depends only on runtime and the order of the approximation. Using truncation error arguments and examples we will show that it is not a constant and depends also on the wavenumber. This dependence on the numerical order and wavenumber strongly favors high order schemes for use in flows which have significant energy in the high modes such at Rayleigh–Taylor and Richtmyer–Meshkov instabilities.     

A base62 transformation format of ISO 10646 for multilingual identifiers

ISO 10646 Universal Character Set (UCS) is a 31‐bit coding architecture that covers symbols in most of the world's written languages. Identifiers in programming languages are usually defined by using alphanumeric characters of ASCII, which represent mainly English words. An approach for working around this deficiency is to encode multilingual identifiers into the alphanumeric range of ASCII. For case‐sensitive languages, an encoding that utilizes [0–9][A–Z][a–z] can be more space‐efficient for multilingual identifiers. This paper proposes a base62 transformation format of ISO 10646 called UTF‐62. The resulting string of UTF‐62 is within a [0–9][A–Z][a–z] range, a total of 62 base characters. UTF‐62 also preserves the lexicographic sorting order of UCS‐4. Copyright © 2001 John Wiley & Sons, Ltd.