用有限状态图来识别系统入侵

文章首先对系统入侵的状态转换进行了研究,通过使用有限状态图的分析方法,分析识别了常见黑客攻击的特征,包括ROOT用户攻击、TCPSYNFLOODING、IP分片攻击等等;最后根据对系统入侵的状态转换图的研究和对攻击特征的分析设计了一个入侵检测系统。     

基于RST语篇分析方法的问题回答系统的答句生成

提出了一种问答系统中非实体类型的答句生成方法，该方法从修辞关联分析的基本原理和技术入手，应用RR分析技术进行汉语QA系统中答案抽取和生成的基本方法和步骤，实现了一个实验系统。论文中给出了实验结果并进行了详细分析。     

庙沟铁矿选矿流程优化的初步探讨

由于原矿性质发生变化，庙沟铁矿现行选矿工艺流程已不能完全适应生产需要，主要表现为：精矿品位达不到要求，二次细筛效率低，磁铁矿反富集严重。作者提出了采用粒度分级工艺对流程进行优化的措施。     

Grating overgrowth and defect structures indistributed-feedback-buried heterostructure laser diodes

Distributed-feedback (DFB)-buried heterostructure lasers incorporating a substrate grating require epitaxy of waveguide layers over the corrugated grating surfaces. Unlike epitaxy on planar (100) substrate, the corrugated substrate surface contains undesirable crystal facets which lead to an uncontrollable variation in local composition during epitaxy, and thereby results in strong localized misfit stresses. These localized misfit stresses further affect the subsequent growth of high quality layers which constitute the active device structures. To address the general issue of epitaxy on a corrugated surface, a thermodynamic analysis is performed for surface mass transport on a grating surface at normal growth temperature to show that grating wash-out is a thermodynamically favorable process. However, growth on a perfectly preserved grating is undesirable due to the composition shift on groove facets. A systematic study of substrate orientation dependent composition variation of quaternary layers indicates a composition shift generally toward In and P rich directions for orientations from (100)-(111). Conditions for a strain free waveguide layer growth are demonstrated. The commonly observed imperfections associated with a grating overgrowth are summarized, and their effects on device reliability are discussed     

A logic-based axiomatic model of bargaining

This paper introduces an axiomatic model for bargaining analysis. We describe a bargaining situation in propositional logic and represent bargainers' preferences in total pre-orders. Based on the concept of minimal simultaneous concessions, we propose a solution to n-person bargaining problems and prove that the solution is uniquely characterized by five logical axioms: Consistency, Comprehensiveness, Collective rationality, Disagreement, and Contraction independence. This framework provides a naive solution to multi-person, multi-issue bargaining problems in discrete domains. Although the solution is purely qualitative, it can also be applied to continuous bargaining problems through a procedure of discretization, in which case the solution coincides with the Kalai–Smorodinsky solution.     

Bioefficacy of essential and vegetable oils of Zanthoxylum xanthoxyloides seeds against Acanthoscelides obtectus (Say) (Coleoptera: Bruchidae)

Experiments were conducted in the laboratory to evaluate the bioefficacy of essential and vegetable oils of Zanthoxylum xanthoxyloides (Rutaceae) against Acanthoscelides obtectus (Coleoptera: Bruchidae). The chemical composition of the essential oil and the fatty acid composition of the vegetable oil extracted from the seeds of Z. xanthoxyloides were determined. The insecticidal activities of these oils and the associated aromatized clay powder were evaluated against A. obtectus. Both oils were strongly repellent (100% repellency at 0.501 μl/cm2 essential oil and 3.144 μl/cm2 vegetable oil) and highly toxic (LC?? = 0.118 μl/cm2 for essential oil) to this beetle after contact on filter paper. The vapors of the essential oil were highly toxic to adult insects (LC?? = 0.044 μl/cm3), and the aromatized powder made from clay and essential oil was more toxic (LD?? = 0.137 μl/g) than the essential oil alone (LD?? = 0.193 μl/g) after 2 days of exposure on a common bean. Both oils greatly reduced the F? insect production and bean weight loss and did not adversely affect the bean seed viability. In general, the results obtained indicate that these plant oils can be used for control of A. obtectus in stored beans.     

Measurement of the Yield Stress of Protein Foams by Vane Rheometry

The yield stresses of protein foams made from varying protein types (spray dried egg white and whey protein isolate), protein concentrations, whip times, and mixer models were evaluated using vane rheometry. Two methods of analysis (point and slope methods) were investigated. Yield stress values determined by slope and point methods were similar for egg white protein foams but did not agree in the analysis of whey protein foams. Point method values were very reproducible in all foams tested. Egg white protein solutions formed stiffer foams more rapidly and at lower protein concentrations than foams made from whey protein isolate. Vane rheometry was shown to be a reliable method of determining yield stress in protein foams.     

Ad Hoc网络中一种基于Tabu搜索的低耗单播路由算法

Ad Hoc网络中,节点能量影响网络的稳定性和整个网络的生命周期.因此我们需要在提供可靠QoS服务的同时尽量降低能耗,延长整个网络的生命周期,而保证QoS服务前提下求解低能耗单播路由的算法是一个NP完全问题.针对这个问题,提出一个基于Tabu搜索的低耗单播路由算法,该算法选择延迟作为QoS参数,利用Tabu搜索的集中性与广泛性并存的优点,在保证QoS服务质量的同时尽量减少网络节点平均能量消耗,以提高整个网络的生命周期.仿真结果表明:该算法在延长网络生命周期方面具有良好效果.     

Exploration of high‐gravity fermentation to improve lactic acid bacteria performance and consumer's acceptance of malt wort‐fermented beverages

Lactic acid bacteria (LAB) fermentation performance is essential for aroma metabolites formation and product flavour quality. Hence, this study appraises high‐gravity malt wort fermentation (HGF) by three LAB strains to improve the fermentation performance and consumer's acceptance of lactic acid‐fermented malt‐based beverages (LAFMB). HGF at 20% (w/w) provided higher amino acid content and buffering capacity that allowed greater cell development, viable cell count and sugar utilisation. Moreover, the pH change was lesser although marked lactic acid accumulation. It is noteworthy that HGF significantly incremented the content of higher alcohols (+0 – 161%), 2‐phenylethanol (+11–147%), acetaldehyde (+27–44%) and β‐damascenone (+25 – 66%) comparing to low‐gravity malt wort at 12%. Thus, HG‐fermented beverages were significantly preferred with greater hedonic scores (4.6 ± 2.1). Our results indicate that HGF is a valuable strategy for improving LAB fermentation performance in malt wort, which in turn increases key aroma compound content resulting in enhanced acceptance of LAFMB.     

框架问题的一种可行解

本文提出了一种基于实用原则的框架问题的解决方案,证明该方案的表达能力与Reiter的方案等价,分析了两种方案各自的特色及适用范围,提出了效应公理的完备化概念,给出了效应公理的规则表示形式,这些结果为基于意向驱动的agent模型的建立以及面向agent的程序设计语言AGPLID的提出提供了必要的理论基础.