动态规划算法分析与研究

分析多阶段决策问题,总结动态规划的基本概念、原理以及解题。通过0－1背包问题的具体解题步骤,阐述动态规划算法一般解题思路。并分析常用经典算法在解决最优问题中的差异性,比较各自优缺点,探讨其研究方向。     

锡精炼硫渣除铜生产实践

锡火法精炼系统加硫除铜产出的硫渣（铜渣）含有较高杂质铜,为了减小杂质铜在锡系统的循环,通过将硫渣焙烧、浸出的工艺实现杂质铜在锡系统生产过程的开路,综合回收有价金属铜。     

基于动态密度的空中交通复杂度计算方法研究

空中交通复杂度是指管制员所指挥空域的复杂程度。当航空器在空中的运行发生变化时,会产生大量的潜在冲突。本文基于成熟的空中动态密度模型,将诸多参数进行分类,并选出最能表征这一类的突出参数,建立新的复杂度计算模型。并参考管制员解决冲突时所产生的冲突负荷,分别从交通密度、交通进展、飞行流结构、交通混合四个方面进行修正,得出复杂度的计算公式。并利用雷达数据对某一空域进行测算,得出该空域的交通复杂度值。     

Information resources estimation for accurate distribution-based concept drift detection

Machine learning applications must continually utilize label information from the data stream to detect concept drift and adapt to the dynamic behavior. Due to the computational expensiveness of label information, it is impractical to assume that the data stream is fully labeled. Therefore, much research focusing on semi-supervised concept drift detection has been proposed. Despite the large research effort in the literature, there is a lack of analysis on the information resources required with the achievable concept drift detection accuracy. Hence, this paper aims to answer the unexplored research question of “How many labeled samples are required to detect concept drift accurately?” by proposing an analytical framework to analyze and estimate the information resources required to detect concept drift accurately. Specifically, this paper disintegrates the distribution-based concept drift detection task into a learning task and a dissimilarity measurement task for independent analyses. The analyses results are then correlated to estimate the required number of labels within a set of data samples to detect concept drift accurately. The proximity of the information resources estimation is evaluated empirically, where the results suggest that the estimation is accurate with high amount of information resources provided. Additionally, estimation results of a state-of-the-art method and a benchmark data set are reported to show the applicability of the estimation by proposed analytical framework within benchmarked environments. In general, the estimation from the proposed analytical framework can serve as guidance in designing systems with limited information resources. This paper also hopes to assist in identifying research gaps and inspiring new research ideas regarding the analysis of the amount of information resources required for accurate concept drift detection.     

基于系统动力学的沪江浙皖绿色创新竞争力动态仿真研究

创新驱动和绿色发展战略结合的绿色创新理念为长三角一体化高质量发展注入了新动力。鉴于绿色创新竞争力系统的复杂性,通过构建创新投入、创新资源、生态环境和创新产出四个子系统的绿色创新竞争力指标体系,结合系统动力学理论构建绿色创新竞争力系统仿真模型。以长三角沪江浙皖四省(市)为研究区域,动态仿真研究四省(市)的绿色创新竞争力演变趋势,分析比较关键变量,明确四省(市)绿色创新竞争力的差异与优势。研究结果表明：各变量的变化趋势均有利于绿色创新竞争力的提升,整体指标状况优良,绿色创新效益显著。江苏省的绿色创新竞争力综合水平最高,浙江省的绿色创新竞争力综合水平与上海市基本相近,安徽省处于最低位置。四省(市)在绿色创新竞争力的不同维度分别占据优势。     

计算机辅助分析和设计在微波技术中的应用

本文首先分析了计算机辅助分析、辅助设计和微波分析、微波设计中遇到的问题的特点以及它们之间的关系,然后以传 输线阻抗匹配为例,证明了计算机辅助分析和设计在微波教学和科研中的重要意义。     

组态软件实时数据库系统研究及设计

利用Windows的DLL(动态连接库)和全局共享内存技术来建立系统实时数据库的设计思想,采取传统数据库系统、文件系统和内存数据库系统兼用,利用多种存储介质来构造系统的实时数据库系统,并通过给用户提供一套接口标准——实时数据库系统接口,来实现I/O驱动程序与用户程序和实时数据库系统间的高速数据传递。     

中国高技术产业技术创新动态能力演化研究

高技术产业的蓬勃发展过程中技术创新的作用至关重要,因此高技术产业技术创新成为全世界各国竞争的核心与学术研究的热门。为了探究高技术产业技术创新动态能力的演化过程,本文根据经典物理力学理论,构建中国高技术产业技术创新动态能力演化三维动态模型,从技术创新动态能力的主导逻辑思维出发,以能力广度、能力深度、能力的生命周期三个角度,对高技术产业技术创新动态能力演化模型进行维度分析。研究表明高技术产业技术创新动态能力演化过程在空间内形成类似于S型的曲面。     

Off line simulation system of machining processes

The primary objective for modeling of machining processes is to develop a predictive capability of machining performance in order to facilitate effective planning of machining operations. This capability leads to faster implementation, higher performance, quality at a lower cost. This comes about due to improved selection of machining parameters, optimal fixture design and the avoidance of tool failure. The simulation system presented simultaneously considers the effect of cutter geometry, the cutter's initial position errors, workpiece geometry, machine tool dynamics, and workpiece/fixture system dynamics on the machining process.The integration of all of the above in one model provides an off-line tool to simulate and optimize the machining parameters and the fixture configuration cutting both lead and production time. The modular nature of the simulation system presented allows for the study of many different machining processes. The cutting forces in this system are modeled using a mechanistic approach. NURBS curves and surfaces are utilized for the geometric modeling and simulation of the machining process. While a finite element method is used to model and analyze the workpiece/fixture dynamics. Two case studies are presented to demonstrate the practical application of the presented simulation. The first case presents the optimization of the fixture configuration of a generic automotive component. While the second case presents the results of simulations performed on a novel mill/grind machining process. This process is a combination of face milling and grinding in one operation. Some simulated results are presented along with experimental validation.     

银川平原浅层地下水资源和水盐调控研究

在阐述银川平原浅层地下水形成分布规律性的基础,首次在该地区采用三维地下水有限差分模型计算了地下水资源量、补排组构和可利用量。论证和提出用有害盐量取代以往惯用全盐量评价盐害和计算排引比的传统做法,通过水盐均衡计算指出30多年来灌区——直处在脱盐状态。论证和提出了银北灌区各类水量的宏观调控意见,动态模拟计算了不同规划水平年引、排水9套方案,提出了不同地区和采用不同方案引用黄河水量和开发利用地下水量的意见。