基于WLAN的无线通信异步快速切换机制研究

在高速移动环境下,无线通信的数据传输存在丢包现象,通过研究WLAN的链路层协议切换步骤,提出了采用减少扫描信道数量和选择扫描信道的策略来解决无线通信高速切换时的数据丢包现象,并通过构建高速无线通信切换系统进行了仿真测试。测试结果表明,采用减少扫描信道数量和选择扫描信道的异步无线通信切换机制可以将切换链路中断的时间由6s左右缩短至不到2s。     

基于非线性系统辨识的蒸汽管网输配效率

蒸汽管网输配效率表征蒸汽输送过程中的能耗占输送蒸汽能量的比例，输配管网的能耗表现为排出冷凝水带走的能量和沿管壁热传递散失的能量2种形式．为研究2种形式的能耗在输配能耗中的比例，提出对蒸汽管网建立动态非线性外源自回归模型，并针对天津市空港工业区蒸汽热网进行了案例研究．应用该模型对蒸汽源在不同压力、过热温度条件下的管网输配能耗进行了模拟．结果表明：蒸汽压力的提高对减少管网输配中产生的冷凝水和降低散热损失均有明显效果，提高过热度可以有效减少冷凝水的产生，但不降低总体能耗．     

词汇识别的双通道交互激活模型及ERP研究

双通道交互激活模型(BIAM模型)是目前词汇识别理论中最为完整的模型.介绍了BIAM模型的一般特点及其对视觉词汇识别的解释机制,对围绕该模型进行的ERP研究所获得的成分的心理意义进行了阐述,主要包括N/P150,N250,P325,N400,并提出了今后的研究方向.     

New probabilistic transformation of imprecise belief structure

The case when the source of information provides precise belief function/mass,within the generalized power space,has been studied by many people.However,in many decision situa-tions,the precise belief structure is not always available.In this case,an interval-valued belief degree rather than a precise one may be provided.So,the probabilistic transformation of impre-cise belief function/mass in the generalized power space including Dezert-Smarandache(DSm) model from scalar transformation to sub-unitary interval transformation and,more generally,to any set of sub-unitary interval transformation is provided.Different from the existing probabilistic transformation algorithms that redistribute an ignorance mass to the singletons involved in that ignorance pro-portionally with respect to the precise belief function or probability function of singleton,the new algorithm provides an optimization idea to transform any type of imprecise belief assignment which may be represented by the union of several sub-unitary(half-) open intervals,(half-) closed intervals and/or sets of points belonging to [0,1].Numerical examples are provided to illustrate the detailed implementation process of the new probabilistic transformation approach as well as its validity and wide applicability.     

浅论现代企业战略联盟竞争模式的意义

战略联竞争模型的意义在于有利于提升企业竞争力，加速研究开发新技术新产品，开拓国际市场，争取规模经济效益，降低经营风险。     

特征向量的LFSR序列分析中的应用

利用线性反馈移位寄存器（LFSR）的生成多项式的矩阵表示，通过对该矩阵的特征向量分析，给出了线性反馈移位寄存器输出结果的明确表达式。其中的系数完全依赖于初始输入值及其极小多项式的互反多项式的根，所得结果对LFSR的性质作了更进一步的揭示，比已知的结论更明确。     

基于修正熵的距离扩展目标检测器

针对采用球不变随机向量(spherically invariant random vector, SIRV)建模的非高斯杂波背景下，目标散射点个数估计失配时，修正的依赖于散射点密度的检测器（modified scatter density dependent, MSDD)检测距离扩展目标存在一定的信噪比损失问题，提出了一种基于修正熵的MSDD检测器（modified entropy-MSDD, ME-MSDD）。ME-MSDD先采用修正熵对目标强散射点个数进行估计，然后对目标强散射点进行积累形成检测统计量。最后，针对不同的目标模型及实测目标一维距离像对检测器性能进行评估，结果表明，与不依赖于散射点密度的检测器（non-scatter density dependent, NSDD)、基于动态阈值的检测器（dynamic threshold, DT)和MSDD相比，ME-MSDD能根据实际观测值自适应地估计目标散射点个数，具有更好的检测性能和鲁棒性。     

Capacity commitment and pricing for substitutable products under competition

Capacity acquisition and pricing decisions are a company’s long-term strategic decisions.However, demand uncertainty and substitutability of multiple products cause the difficulty to solve capacity and pricing decision problems.In this paper,we address a multiple product pricing and multiple resource capacity acquisition problem with demand uncertainties and competition.The company needs to determine capacity commitment for each resource and product prices before demands are realized so that the total profit is maximized.If the demand exceeds the committed capacity,extra amounts can be purchased from the spot market.Variable unit production costs,capacity acquisition and maintenance costs are considered.We first analyze a single company basic problem and find the optimal solutions on prices and capacity.Based on the single company model,we address the two-product,two-firm capacity commitment and pricing problem considering across product and across company price competition factors.The existence and uniqueness of equilibrium on price and capacity commitment are proved,and then we extended the results to the multiple product,multiple company case.     

齐墩果烷类皂甙天然产物13C NMR化学位移规律及其结构智能解析

通过对大量齐墩果烷类皂甙天然产物 1 3C NMR化学位移的分析和研究 ,总结了其1 3C NMR图谱特征及化学位移规律 ,对影响其结构骨架上不同位置碳原子化学位移因素进行了分析 ,建立了用于齐墩果烷类皂甙天然产物 1 3C NMR图谱智能解析知识库并对智能解析进行了初步的探讨 .     

抗坏血酸钙的合成及抗氧化作用

利用Ｌ－抗坏血酸（以下简称Ｖｃ）和碳酸钙为主要原料合成了Ｌ－抗坏血酸钙（ＣａｌｃｉｕｍＬ－Ａｓｃｏｒｂａｔｅ，以下简称Ｖｃ－Ｃａ），并研究了该产品作为保鲜剂在鸡肉和鱼肉中地抗氧化作用。结合表明其抗氧化效果很好，可以广泛地添加到肉类食品中，以防蛋白质变质。