陶瓷企业公共关系与市场营销

公共关系是提高企业形象竞争力的法宝,企业将公共关系运用于营销活动之中,能够与社会公众建立、维持和发展良好的互利关系,通过树立良好的企业形象和信誉,从而为企业市场营销创造一个和谐的环境。从公共关系与市场营销的内涵入手,对市场营销中公共关系的作用和具体应用进行了初步的分析,希望通过这些分析,能够引起陶瓷企业在营销活动中对公共关系的注意。     

基于ZigBee的粮仓环境监测系统设计与实现

ZigBee作为当前主流的无线传感网技术,具有成本低廉、组网便捷、扩展灵活等特点。文章提出将ZigBee技术应用于粮仓环境监测系统中,相比有线粮仓环境监控系统,可以提高灵活性和可靠性。该系统结合CC1101无线传输模块和STC89C52控制器实现对各传输节点的软硬件设计。实现了环境参数的自动采集、无线传输,在协调器节点汇总的数据可以交由控制中心实现对数据的实时分析。     

A space and time efficient algorithm for SimRank computation

SimRank has become an important similarity measure to rank web documents based on a graph model on hyperlinks. The existing approaches for conducting SimRank computation adopt an iteration paradigm. The most efficient deterministic technique yields O(n³)O\left(n^3\right) worst-case time per iteration with the space requirement O(n²)O\left(n^2\right), where n is the number of nodes (web documents). In this paper, we propose novel optimization techniques such that each iteration takes O (min{ n ·m , n^r })O \left(\min \left\{ n \cdot m , n^r \right\}\right) time and O ( n + m )O \left( n + m \right) space, where m is the number of edges in a web-graph model and r ≤ log₂ 7. In addition, we extend the similarity transition matrix to prevent random surfers getting stuck, and devise a pruning technique to eliminate impractical similarities for each iteration. Moreover, we also develop a reordering technique combined with an over-relaxation method, not only speeding up the convergence rate of the existing techniques, but achieving I/O efficiency as well. We conduct extensive experiments on both synthetic and real data sets to demonstrate the efficiency and effectiveness of our iteration techniques.     

高掺量粉煤灰路面试验研究获得成功

据悉，“十一五”期间六盘水市的煤产量将达到4000万t／年，火电装机容量为1000万KW，粉煤灰排放量将逐步增到1000万t左右。为提高粉煤灰的综合利用率，拟将粉煤灰混凝土用于公路路面工程。     

A UNIFIED FRAMEWORK OF TARGETED MARKETING USING CUSTOMER PREFERENCES

One of the fundamental tasks of targeted marketing is to elicit associations between customers and products. Based on the results from information retrieval and utility theory, this article proposes a unified framework of targeted marketing. The customer judgments of products are formally described by preference relations and the connections of customers and products are quantitatively measured by market value functions. Two marketing strategies, known as the customer‐oriented and product‐oriented marketing strategies, are investigated. Four marketing models are introduced and examined. They represent, respectively, the relationships between a group of customers and a group of products, between a group of customers and a single product, between a single customer and a group of products, and between a single customer and a single product. Linear and bilinear market value functions are suggested and studied. The required parameters of a market value function can be estimated by exploring three types of information, namely, customer profiles, product profiles, and transaction data. Experiments on a real‐world data set are performed to demonstrate the effectiveness of the proposed framework.     

基于海量搜索历史数据的用户兴趣模型

针对互联网搜索引擎环境中,基于海量搜索历史数据分析用户兴趣的问题,提出一种改进的用户兴趣模型。该模型根据用户搜索的历史数据,结合向量空间模型（ VSM ）和TF-IDF算法,递归地回溯出用户兴趣权重列表。为解决用户兴趣变化和时间性能的问题,该模型引入时间遗忘机制进行动态更新,并在Hadoop分布式系统架构下利用MapReduce分布式编程模型进行实现。实验结果表明,改进的用户兴趣模型的查准率和召回率都能达到50',具有较好的可行性和可用性。     

基于FT311D的Android移动设备硬件接口拓展设计

FT311D接口芯片为Android手机或平板电脑提供了USB转外部UART、GPIO、PWM、I2 C、SPI硬件接口功能。本文介绍了FT311D的硬件特点及其在Android平台下的软件开发方法。实验表明,基于FT311D的Android设备USB转外部接口方案硬件设计简单,软件开发方便,可广泛应用于物联网、车载系统、POS机、智能医疗保健仪器设备等。     

混凝土力学时空特性对衬砌支护设计影响研究

竖井支护设计对围岩稳定和施工安全具有重要意义,水利水电工程中采用正井法开挖引水竖井的工程案例较少。根据正井法施工特点,确定开挖、初衬以及拆模等工序需要的具体时间,考虑混凝土力学参数的时效特征,并结合所在区域的地质条件、岩体力学参数以及开挖进尺,对初衬设计厚度、强度以及拆模时间等进行了研究,形成了一套基于正井法施工,考虑衬砌混凝土力学参数时空特征条件下的衬砌设计方法。实践表明,考虑混凝土力学参数时空特征条件下的支护设计更加合理,具有一定经济和社会效益。     

IOIO在Android手机中的应用与研究

IOIO是一个面向Android手机的软硬件开发平台,通过USB接口实现Android手机与外界物理设备的互动。本文介绍了IOIO的硬件特性与开发环境,给出了如何用IOIO来实现对LED控制的实例。实验结果表明,采用IOIO开发Android手机具有简单易用的特点。     

分布式环境下的关系型XML查询优化

XML数据查询是XML相关技术中一项的重要技术.与普通的XML查询方法不同,关系型XML查询不需要路径表达式,给查询者带来了便利,然而与此同时也带来了计算量增大的问题.针对该问题,给出了一种在分布式环境下基于部分求值的解决方案,并提出了优化算法.实验表明,该算法不仅能提高关系型XML查询的效率,而且能提高查询的适应性,使得查询可以在更为苛刻的条件下进行.