几种变频恒压供水控制系统的比较与探讨

介绍了现今主要的变频恒压供水控制系统,并对其进行比较分析。     

指数风险偏好下的最优保险策略

本文讨论了当投保个体和保险公司为指数风险偏好时,在保费约束下投保个体的最优保险策略问题。本文采用求解对偶优化问题的方法求解这个问题,并给出当损失服从指数分布时最优保险策略解的解析式。本文最后讨论了投保个体和保险公司风险厌恶程度以及保费预算变化对个体最优保险策略的影响。     

A proposed configurable approach for recommendation systems via data mining techniques

This study presents a configurable approach for recommendations which determines the suitable recommendation method for each field based on the characteristics of its data, the method includes determining the suitable technique for selecting a representative sample of the provided data. Then selecting the suitable feature weighting measure to provide a correct weight for each feature based on its effect on the recommendations. Finally, selecting the suitable algorithm to provide the required recommendations. The proposed configurable approach could be applied on different domains. The experiments have revealed that the approach is able to provide recommendations with only 0.89 error rate percentage.     

锁相环频率合成器设计与Simulink仿真

介绍了锁相环频率合成器的的组成及工作原理,并基于Simulink平台对双环锁相4倍频频率合成器进行了模型设计,仿真结果表明了设计的正确性及可行性。     

连续批计数抽样检验中的跳批抽样技术

文章介绍了跳批抽样的基本原理、适用范围、条件以及一般程序。文章主要对GB／T2828．3《计数抽样检验程序第3部分跳批抽样程序》技术内容进行了解读和介绍,帮助实际应用者正确运用跳批抽样程序,以达到预期目的。     

EPC网络Savant中间件的设计与实现

通过融合物联网、EPC(产品电子码)、RFID(射频识别)、PML(物理标识语言)、Savant中间件等一系列新技术,研究与实现了一种Savant中间件系统,可同时读出EPC编码的多个物品的基础数据,并在进行计算后将数据存入/取出数据库。文章详细描述了使用物理标示语言(PML)从多个EPC标签中获取信息、进行计算操作、完成信息改变、及时更新数据库信息的技术过程。     

变频器调速系统在门式起重机上的应用

随着新技术和控制系统设备的发展,变频调速技术在起重机领域得到广泛应用,为可靠调速及节能提供全新的方案。文中研究了变频调速技术在门式起重机中的应用,对变频调速系统常见故障做了归纳总结,并提出了相应的解决措施,为起重机电控系统设计及改造提供了参考。     

物联网技术在农产品物流中的应用探讨

物联网技术是近几年国家科技发展的重点,其在各个领域的应用是未来科技发展的大趋势。文章简要介绍了物联网技术的概念及发展过程,结合物联网技术对现代农产品物流的影响,通过对我国农业物流中存在的农产品物流技术设备落后,信息流通缓慢等问题的分析,探讨在新型农业贸易中运用物联网技术的发展前景,为在物联网时代更好地发展现代农业贸易提出建议。     

Dynamic advertising and pricing with constant demand elasticities

In this paper we analyze a stochastic dynamic advertising and pricing model with isoelastic demand. The state space is discrete, time is continuous and the planing horizon is allowed to be finite or infinite. A dynamic version of the Dorfman–Steiner identity will be derived. Explicit expressions of the optimal advertising and pricing policies, of the value function and of the optimal advertising expenditures will be given. The general results will be used to analyze the case of impatient customers. Furthermore, particular time inhomogeneous models and homogeneous ones with and without discounting will be examined. We will study the social efficiency of a monopolist's optimal policies and the consequences of specific subsidies. From a buyer's perspective, our analysis reveals that waiting – when looking at (immediate) expected prices – is never profitable should two or more units be available. But we will also prove that the sequence of average sales prices is monotone decreasing. Moreover, the techniques applied to solve the discrete stochastic advertising and pricing problem will be used to solve a related deterministic control problem with continuous state space.