Dynamic Customer Acquisition and Retention Management

In consulting, finance, and other service industries, customers represent a revenue stream, and must be acquired and retained over time. In this paper, we study the resource allocation problem of a profit maximizing service firm that dynamically allocates its resources toward acquiring new clients and retaining unsatisfied existing ones. The interaction between acquisition and retention in our model is reflected in the cash constraint on total expected spending on acquisition and retention in each period. We formulate this problem as a dynamic program in which the firm makes decisions in both acquisition and retention after observing the current size of its customer base and receiving information about customers in danger of attrition, and we characterize the structure of the optimal acquisition and retention strategy. We show that when the firm's customer base size is relatively low, the firm should spend heavily on acquisition and try to retain every unhappy customer. However, as its customer base grows, the firm should gradually shift its emphasis from acquisition to retention, and it should also aim to strike a balance between acquisition and retention while spending its available resources. Finally, when the customer base is large enough, it may be optimal for the firm to begin spending less in both acquisition and retention. We also extend our analysis to situations where acquisition or retention success rate, as a function of resources allocation, is uncertain and show that the optimal acquisition and retention policy can be surprisingly complex. However, we develop an effective heuristic for that case. This paper aims to provide service managers some analytical principles and effective guidelines on resource allocation between these two significant activities based on their firm's customer base size.     

基于单片机的智能手机电池充电系统

本文以延长手机电池寿命,提高使用效率为出发点,采用51单片机加上外围电路,通过脉宽调制对手机电池充电曲线进行模拟,并且用单片机对充电、放电过程进行智能控制,从而提高手机电池的使用效率,达到延长使用寿命的目的。     

基于语言视角的“国际贸易实务”课程双语教学

文章从教学实践出发,以结构式浸没双语教学模式为指导,从国际贸易的特点所折射的"对称性、简洁性和文化性"等语汇特征的角度,论述了在"国际贸易实务"课程双语教学过程中应该注意传递的关键信息,以提高学生的学习兴趣,改善双语教学的效果.     

阿立哌唑与利培酮治疗精神分裂症的对照研究

目的评价阿立哌唑与利培酮治疗精神分裂症的疗效及安全性。方法阿立哌唑组50例,剂量范围10~30mg/d;利培酮组48例,剂量范围4~6mg/d,两组均以PANSS、CGI量表及TESS、RSESE量表评定观察6周。结果阿立哌唑组治疗精神分裂症与利培酮组相比总体疗效相当。阿立哌唑组PANSS-阴性因子项目减分在第4周末(t=1.89,P<0.05)及6周末(t=2.27,P<0.05)优于利培酮组。阿立哌唑组的药物不良反应小。结论阿立哌唑是有效且安全的非典型抗精神病药,对精神分裂症阴性阳性症状均有效。     

水中内分泌干扰物质的研究现状及趋势

综述了内分泌干扰物质的种类、特点、作用机理、危害,内分泌干扰物质对水源的污染以及水处理工艺对其去除情况,并指出今后的研究方向。     

弱信号环境下的盲自适应波束形成

针对原CCAB算法的相关矩阵对循环平稳信号不够准确而导致算法在恶劣环境下的鲁棒性不够强问题,提出一种鲁棒性更强的CCAB改进算法。推导了适合循环平稳信号阵列相关矩阵的理论式,经过分析原相关矩阵的不准确性和遗忘因子的正面作用后,得出了新相关矩阵的迭代式。仿真结果表明改进的算法能在计算量不变的情况下更有效地接收弱信号、抑制强干扰,且对循环频率误差不敏感。     

生成语法理论与主宾语的识别

主语和宾语是谓词题元结构和句法操作结果的表征,识别主宾语必须从语义和句法两个层面展开.题元关系体现动词和主宾语的语义选择关系,宾语必须受动词题元管辖.功能词类的形态特征核查驱动一切句法操作:T的EPP特征,Tr的格特征必须得到核查,[Spec,TP]为句法层面的主语位置.现代英语中,时态句T的EPP特征强,主语必须显性出现.现代汉语中,T的EPP有强弱之分,允许主语以显性和隐形两种方式出现.     

城市公共设施设计的思考

文章论述了城市公共设施的概念、功能,强调这些设施对于市民和城市所起的重要作用,并指出它们在城市中并不是处于静止状态,而是动态状态——自身不断发展,人与城市是互动关系,最后结合工业设计理论提出公共设施的设计方法,指出在"体验时代"到来的情况下,公共设施的互动特性将是未来发展趋势。     

从“4C”看金盾出版社的农村图书营销

顾客需求、购买成本、便利与沟通是中国出版产业挖掘和培养农村图书市场必须研究的四个关键性问题.本文以市场营销学中的"4C"理论对金盾出版社做的个案分析所折射出的农村图书营销智慧,对其他出版社有一定的示范效应.     

静电喷雾法制备海藻酸钙-羧甲基纤维素钠液芯微胶囊的工艺选优

尝试用高压静电成囊装置(静电喷雾法)来制备一种强度高、生物相容性好的海藻酸钙-羧甲基纤维素钠液芯微囊.在初步试验的基础上,利用正交试验的方法考察了海藻酸钠、羧甲基纤维素钠以及氯化钙的浓度对成囊过程中微胶囊膜厚、粒径等的影响.同时结合不同制备条件下微胶囊的成囊性,优化海藻酸钙-羧甲基纤维素钠微胶囊制备工艺.在优化的工艺参数中海藻酸钠、氯化钙以及羧甲基纤维素钠的质量浓度分别为10,30,15 g/L.