基于灰色聚类的珠三角区域物流竞争能力分析

建立区域物流能力指标体系,收集相关数据,应用灰色定权聚类分析法,对珠三角各个城市物流能力各项指标定量分析。依据结果,判断各个城市属于哪个类别,分析各个城市的物流发展潜力并提出相关建议。     

七通道抗干扰GNSS接收机射频前端设计

针对目前全球卫星导航系统(Global Navigation Satellite System,GNSS)普遍存在的抗干扰能力弱的突出问题,研制了一款七通道抗干扰GNSS接收机,通过利用多模组合导航抗干扰技术及级联/组合空域、时域与频域等多重抗干扰技术来应对复杂电磁环境应用的需求。重点介绍了抗干扰GNSS接收机射频前端的设计方法,通过数理推导给出了产品设计需求与整个射频前端及各级电路的设计指标之间的定量关系,从而提供了在已知设计需求的条件下进行产品正向设计的设计准则与方法。通过产品投产和测试,测试结果与设计需求吻合,从而验证了该套设计方法有效可行,同时该套准则与方法具有很强的普适性。与同类产品比较以及整机试验表明,该产品的抗干扰能力(主要体现为最大可承受干信比)较同类产品提升20 dB以上,证明产品具有一定的先进性。     

基于灰色聚类的新时期水利科研单位绩效考核分析

水利科研单位作为水利事业发展中的科技创新主力军,为落实国家科技创新管理机制要求,需要构建完善有效的绩效考核体系,进行公平与科学的绩效考核。基于新时期下国家科技创新管理机制的要求与水利科研单位特点构建绩效评估体系,通过层次分析法进行各指标权重的确定,运用灰色聚类方法中的三角白化权函数进行科研单位绩效考核的等级评价,以J省水利科学研究院为例作实证分析,评价得到水科院的绩效考核综合等级为良好,由此提出相关建议,为加强内部和外部管理提供依据,为完善水利科研单位绩效考核指标体系提供参考。     

终端短路圆杆交指带通滤波器的设计

介绍了一种终端短路式圆杆交指带通滤波器的设计方法。根据交指滤波器的准确设计理论获得的圆杆自电容和互电容，结合图表得到了滤波器的最初尺寸，并结合微波电路仿真软件对其进行了优化、仿真。仿真结果和实际测试的结果比较一致。证明了设计方法的可行性。     

Price clustering on the limit-order book: Evidence from the Stock Exchange of Hong Kong

We examine the clustering pattern in trade and quote prices on the electronic limit order book of the Stock Exchange of Hong Kong (SEHK). Earlier research into clustering focuses on transaction prices only. We study clustering on quote prices over a maximum of five queues on the limit order book. We observe an abnormally high frequency of even and integer prices in trade and quote prices for all tick size groups on the SEHK. The deeper quotes display stronger clustering than the best quotes, indicating that the farther away the quotes are from the best queue, the less information they carry. Our analysis further reveals that an extremely fine tick size itself works as a binding constraint to hinder the price resolution process. We also find that short sale prohibition imposed on the majority of stocks listed on the SEHK causes a significant bias in clustering towards the ask side of the limit order book. This implies that a short sale prohibition impairs efficient price discovery in the market.     

浅论一种新的检查算法

利用平均步长的方法,查找给定值的结点位置,使用C语言描述其算法,讨论了该算法的平均检索长度,与其他算法比较,得出了该算法的优劣结论。     

对增量式模糊聚类算法的改进

提出了一种增量式模糊聚类技术的改进算法，该算法仅对新增数据计算相似系数而直接聚类，其结果和动态聚类算法相同；该算法较好地解决了新增数据的聚类及类属问题，提高了模糊聚类算法的收敛速度，实验结果证实改进了算法的高可靠性。     

A multivariate Poisson mixture model for marketing applications

This paper describes a multivariate Poisson mixture model for clustering supermarket shoppers based on their purchase frequency in a set of product categories. The multivariate nature of the model accounts for cross-selling effects between the purchases made in different product categories. However, for computational reasons, most multivariate approaches limit the covariance structure by including just one common interaction term, or by not including any covariance at all. Although this reduces the number of parameters significantly, it is often too simplistic as typically multiple interactions exist on different levels. This paper proposes a theoretically more complete variance/covariance structure of the multivariate Poisson model, based on domain knowledge or preliminary statistical analysis of significant purchase interaction effects in the data. Consequently, the model does not contain more parameters than necessary, whilst still accounting for the existing covariance in the data. Practically, retail category managers can use the model to devise customized merchandising strategies.     

A Fuzzy clustering approach to the key sectors of the Spanish economy

The search for key sectors in an economy has been and still is one of the more recurrent themes in input–output analysis. When using clustering techniques, sectors can only belong to a group, having a particular performance. But, actually, the same sector could be important from different perspectives at the same time, to a different degree. So, a fuzzy clustering approach is needed. In this work we propose a multidimensional approach to classify the productive sectors of the Spanish input–output table for 1995, based on three groups of variables: those related to their productive integration, others measuring their specific weight in the economy and finally some showing their economic dynamic. We also incorporate into the analysis the technological level, which being a categorical variable presents special methodological problems. All these questions are tackled applying a robust and fuzzy clustering analysis, which gives as a result a classification of sectors illustrating the role that each one plays in the Spanish economy.     

基于模糊数学的房地产投资决策研究

对于房地产投资决策问题，尝试用模糊聚类分析和模糊贴近度的方法解决房地产投资决策的问题，并且结合实例对两种方法应用的效果和不足进行了研究。结果表明，应用模糊数学方法能较好地解决房地产的投资决策问题。