1~5轮LBlock的多项式表示及完全性分析

用统计测试方法分析密码算法的完全性存在误差。为此,利用符号计算软件Mathematica 7.0,以明文和密钥比特为自变量,得到LBlock分组密码第1轮~第5轮输出的多项式表达式,结果显示,LBlock第5轮输出的任何比特至多与45个明文比特、49个密钥比特有关,说明5轮LBlock还未达到完全性。     

Belief rule-based methodology for mapping consumer preferences and setting product targets

Rapid and accurate identification of consumer demands and systematic assessment of product quality are essential to success for new product development, in particular for fast moving consumer goods such as food and drink products. This paper reports an investigation into a belief rule-based (BRB) methodology for quality assessment, target setting and consumer preference prediction in retro-fit design of food and drink products. The BRB methodology can be used to represent the relationships between consumer preferences and product attributes, which are complicated and nonlinear. A BRB system can initially be established using expert knowledge and then optimally trained and validated using data generated from consumer or expert panel assessments or from tests and experiments. The established BRBs can then be used to predict the consumer acceptance of new products or set product target values in retro-fit design. The proposed BRB methodology is applied to the design of a lemonade drink product using real data provided by a sensory product manufacturer in the UK. The results show that the BRB methodology can be used to predict consumer preferences with high accuracy and to set optimal target values for product quality improvement.     

基于Jaccard距离与概念聚类的多模型估计

Multi-RANSAC、RHT等方法难以有效实现多模型估计。为此,提出一种基于模型聚类的多模型估计方法。将数据点描述为所属模型的倾向集,把倾向集间的Jaccard距离描述为数据点的一种属性,基于该属性使用改进的Cobweb算法进行聚类。该方法无需预知模型数目和参数变换,可有效克服漏检、交叉模型误检等情况。实验结果表明,该方法具有高效、高精度等优点,适用于消隐点检测、相机自标定等领域。     

基于改进的BOCR和FANP模型的ERP系统选择方法*

ERP系统能够明显影响企业未来的竞争力和企业绩效。ERP系统的选择是一个典型的多因素决策问题。基于BOCR理论建立了ERP系统选择的评价指标体系,考虑了准则/指标之间的相互影响和反馈关系。由于评价过程中信息的不精确和模糊性,用三角模糊数表示专家或决策者的偏好意见,根据模糊优先规划方法计算三角模糊判断矩阵的局部权重。依据准则/指标之间的网络结构关系建立了未加权超矩阵,计算了收敛后的极限超矩阵,以得出各指标的综合权重。最后以案例说明如何应用提出的方法。     

基于条件偏好的XML查询结果排序方法

摘要为了解决XML查询的信息过载问题,提出了基于条件偏好的XML多查询结果排序方法。该方法把用户指定的内容查询谓词作为上下文条件,然后在原始XML数据和查询历史上利用概率信息检索模型推测当前用户偏好,评估结果元素中被查询指定的属性单元值与未指定的属性单元值之间的关联关系以及未指定的属性单元值与用户偏好之间的相关程度,进而构建查询结果元素打分函数;在此基础上,利用打分函数计算结果元素的排序分值,并以此对查询结果进行排序。实验结果表明,提出的排序方法具有较高的排序准确性,能够较好地满足用户需求和偏好。     

Genetic Correlational Analyses of Ethanol Reward and Aversion Phenotypes in Short-Term Selected Mouse Lines Bred for Ethanol Drinking or Ethanol-Induced Conditioned Taste Aversion.

Short-term selective breeding created mouse lines divergent for ethanol drinking (high drinking short-term selected line [STDRHI], low drinking [STDRLO]) or ethanol-induced conditioned taste aversion (CTA; high [HTA], low [LTA]). Compared with STDRLO, STDRHI mice consumed more saccharin and less quinine, exhibited greater ethanol-induced conditioned place preference (CPP), and showed reduced ethanol stimulation and sensitization under some conditions; a line difference in ethanol-induced CTA was not consistently found. Compared with LTA, HTA mice consumed less ethanol but were similar in saccharin consumption, sensitivity to ethanol-induced CPP, and ethanol-induced locomotor stimulation and sensitization. These data suggest that ethanol drinking is genetically associated with several reward-and aversion-related traits. The interpretation of ethanol-induced CTA as more genetically distinct must be tempered by the inability to test the CTA lines beyond Selection Generation 2. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Reinforcer devaluation in palatability-based learned flavor preferences.

Rats exposed to simultaneous compounds of 1 neutral flavor with dilute (2%) sucrose and a 2nd flavor with dilute (2%) maltodextrin subsequently consumed both flavors in preference to a 3rd flavor that was never paired with a palatable taste. Brief training exposure under ad lib food and water minimized the postingestive effects of nutrients, emphasizing the contribution of palatability to these preferences. Devaluation of sucrose or maltodextrin by pairing with illness (Experiment 1) or sensory-specific satiety (Experiment 2) selectively reduced the preference for the flavor previously paired with the devalued reinforcer. Such reinforcer-specific devaluation effects suggest that palatability-based learned flavor preferences are underpinned by a Pavlovian process whereby the cue flavor is associated with the taste of the concurrently consumed palatable reinforcer. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于心理声学参数的车内声品质偏好性评价

应用等间隔直接单尺度评分法对所采集的20个车内噪声样本进行了主观评价实验,并使用Artemis软件计算了其主要的心理声学参数.偏好性评价结果与各心理声学参数间的多元回归分析表明: 尖锐度和响度是影响匀速工况下车内声品质偏好性的两个主要心理声学参数.     

产品技术经济综合评价原型系统

在层次分析法的基础上，提出了一种将TOPSIS法和AHP法进行融合的综合评价方法．此方法可对产品进行全面的技术经济综合评价，为企业进行决策提供依据，使产品研制建立在一个更加客观的量化分析基础之上．结果表明，这种方法科学合理、简明方便，能够处理多层复杂问题，为产品技术经济综合评价提供了思路，具有普遍意义，能推广应用于其他领域的评估．     

EPr／TN网可达性分析的冗余并发后继标识

文中针对ＥＰｒ／ＴＮ网在可达性分析时出现的冗余发后继现象，从产生原因入手，给出一种解决算法，并由此深入这种扩展Ｐｅｔｒｉ网固有不完备性，最后提出了改进方法。