复杂准备结构下多部件动态批量问题的模型和算法

本研究是在著名的有能力约束的批量决策问题CLSP(The Capacitated Lot SizingProblem)基础上进行的。CLSP确定未来有限个周期里在单台设备上生产几种部件的生产数量及时间,以及时满足其外部用户需要(不允许缺货)。每一生产周期里,该设备可生产多种部件。不同部件间的生产转换将花费准备时间和(或)费用。如期末有库存则将发生库存费用。有关部件费用及外部用户需要量虽是已知确定的但随时间变化。目标是如何生产以便在不超过设备生产能力前提下使准备费用、生产费用和库存费用之和尽量最小。在过去的 数十年里,有众多著名科学家研究过CLSP问题。     

可拓聚类预测方法及其在邮电业务总量预测中的应用

本文提出一种新的预测方法－可拓聚类预测方法,并用该方法进行邮电业务总量预测的研究。利用邮电业务总量和三大产业的生产总值的历史数据构造分类经典域和节域物元,应用物元和可订合中的关联函数,建立了业务量水平聚类预测的一种简单模型,通过聚类分析得到邮电业务量预测结果,本文利用我国某地区的实际数据分析计算,结果表明可拓聚类预测方法是有效的。     

我国证券市场混沌的判据

本文通过李雅普诺夫指数和吸引子的分数维这两个指数来研究我国证券市场的混沌特征。利用Ｗｏｌｆ提出的重构相空间技术和Ｇ－Ｐ算法分别计算了上证综指日收益率序列的李雅普诺夫指数和吸引子的分数维。从而得出我国证券市场运行于混沌状态的有力证据。     

变载频带通信号的多速率采样

对处于非整数带位的带通信号,一阶采样往往要引起频谱混迭。提出了一种用多抽样率技术实现欠采样的方法,借助于修正采样率,该方法较好地解决了可变载频带通信号的频谱混迭问题。还提出了用多抽样技术实现欠采样的三种方式     

舰载反导跟踪算法与模型分析

反舰导弹构成了现代舰艇的严重威胁 ,对反舰导弹精确跟踪是反导防御成功的重要前提。针对比例制导的飞航式反舰导弹弹道的特点和机动特征 ,提出了跟踪此类目标的两种新算法———基于自适应模型的算法和基于自适应交互多模型的算法。仿真实验证明 ,这两种各具特点的算法都有足够的适用性能。     

脉冲多普勒雷达频域跳盲与频域解模糊

针对脉冲多普勒雷达中的速度遮挡问题 ,提出了基于频域跳盲的PRF组合选择准则及其跳盲方法 ;针对脉冲多普勒雷达中的速度模糊 ,提出了一种用于解速度模糊的查表法 ,即通过预先存储固定表值 ,将获取的视在目标频率处理后在表中查找 ,从而得到实际目标频率。频域查表法实时性强 ,适于频域解模糊     

调频步进雷达回波实时数字生成的一种新方法

突破宽带信号数字生成方法的框架 ,提出了基于波形存储和实时计算相结合的调频步进雷达回波高速实时数字生成新方法。基于某调频步进雷达系统的研究 ,提出的解决方案摆脱了传统的波形存储直读法和直接数字合成法的局限性 ,即不适应于变换参数的情况 (比如运动目标 ) ,成功地实现了运动多散射点目标回波的实时产生 ,证明方案可行。还对算法的数值稳定性进行了分析。     

Combined effects of solar UV radiation and CO2-induced seawater acidification on photosynthetic carbon fixation of phytoplankton assemblages in the South China Sea

We carried out short term pCO₂/pH perturbation experiments in the coastal waters of the South China Sea to evaluate the combined effects of seawater acidification (low pH/high pCO₂) and solar UV radiation (UVR, 280–400 nm) on photosynthetic carbon fixation of phytoplankton assemblages. Under photosynthetically active radiation (PAR) alone treatments, reduced pCO² (190 ppmv) with increased pH resulted in a significant decrease in the photosynthetic carbon fixation rate (about 23%), while enriched pCO₂ (700 ppmv) with lowered pH had no significant effect on the photosynthetic performance compared to the ambient level. The apparent photosynthetic efficiency decreased under the reduced pCO₂ level, probably due to C-limitation as well as energy being diverged for up-regulation of carbon concentrating mechanisms (CCMs). In the presence of UVR, both UV-A and UV-B caused photosynthetic inhibition, though UV-A appeared to enhance the photosynthetic efficiency under lower PAR levels. UV-B caused less inhibition of photosynthesis under the reduced pCO₂ level, probably because of its contribution to the inorganic carbon (Ci)-acquisition processes. Under the seawater acidification conditions (enriched pCO₂), both UV-A and UV-B reduced the photosynthetic carbon fixation to higher extents compared to the ambient pCO₂ conditions. We conclude that solar UV and seawater acidification could synergistically inhibit photosynthesis.     

Multi-sources information fusion algorithm in airborne detection systems

To aim at the multimode character of the data from the airplane detecting system, the paper combines Dempster- Shafer evidence theory and subjective Bayesian algorithm and makes to propose a mixed structure multimode data fusion algorithm. The algorithm adopts a prorated algorithm relate to the incertitude evaluation to convert the probability evaluation into the precognition probability in an identity frame, and ensures the adaptability of different data from different source to the mixed system. To guarantee real time fusion, a combination of time domain fusion and space domain fusion is established, this not only assure the fusion of data chain in different time of the same sensor, but also the data fusion from different sensors distributed in different platforms and the data fusion among different modes. The feasibility and practicability are approved through computer simulation.     

Stability analysis of the simplest Takagi-Sugeno fuzzy control system using circle criterion

A frequency-domain-based sufficient condition is derived to guarantee the globally asymptotic stability of the simplest Takagi-Sugeno (T-S) fuzzy control system by using the circle criterion. The analysis is performed in the frequency domain, and hence the condition is of great significance when the frequency-response method, which is widely used in the linear control theory and practice, is employed to synthesize the simplest T-S fuzzy controller. Besides, this sufficient condition is featured by a graphical interpretation, which makes the condition straightforward to be used. Comparisons are drawn between the performance of the simplest T-S fuzzy controller and that of the linear compensator. Two numerical examples are presented to demonstrate how this sufficient condition can be applied to both stable and unstable plants.