Size of random Galois lattices and number of closed frequent itemsets

Given a sample of binary random vectors with i.i.d. Bernoulli(p) components, that is equal to 1 (resp. 0) with probability p (resp. 1−p), we first establish a formula for the mean of the size of the random Galois lattice built from this sample, and a more complex one for its variance. Then, noticing that closed α-frequent itemsets are in bijection with closed α-winning coalitions, we establish similar formulas for the mean and the variance of the number of closed α-frequent itemsets. This can be interesting for the study of the complexity of some data mining problems such as association rule mining, sequential pattern mining and classification.     

心理测量信息管理系统的开发应用

心理测量信息管理系统是计算机技术在心理测试中的应用,使题目的测试、统计、查询及打印输出实现了计算机化管理.     

对象组装结构的分析与实现

基于面向对象的思想，介绍了对象组装结构的概念，并提出了组装结构的分析、表示方法，在关系数据库中的存储方法和在用户界面上部件对象的输入方法，结合实例分析说明，给出部分原代码，并讨论了这些方法的优点。     

HFC网络中上行信道三种协议的比较

讨论了基于ＨＦＣ（混合光纤同轴电缆）网络上行多址接入信道的数据通信，比较了几种适于ＨＦＣ中ＭＡＣ（媒体接入控制）层上行数据流的协议，包括分布式协议ＲＡＬＯＨＡ，集中式协议ＵｎｉＬＩＮＫ，以及一种新的协议ＰＣＵＰ（流水线循环上行流协议），最后得出了ＰＣＵＰ协议比较适合ＨＦＣ网中的双向交互式业务的结论。     

程控数据/波形发生器卡的设计

以微型计算机为基础，提出了程控数据／波形发生器卡的设计思想，阐述了硬件、软件设计的具体方法。并应用这一思想和方法设计并实现了可程控的DW－2024型数据／波形发生器卡。     

Reputation and efficiency: A non-parametric assessment of America’s top-rated MBA programs

Widely publicized reports of fresh MBAs getting multiple job offers with six-figure annual salaries leave a long-lasting general impression about the high quality of selected business schools. While such spectacular achievement in job placement rightly deserves recognition, one should not lose sight of the resources expended in order to accomplish this result. In this study, we employ a measure of Pareto-Koopmans global efficiency to evaluate the efficiency levels of the MBA programs in Business Week’s top-rated list. We compute input- and output-oriented radial and non-radial efficiency measures for comparison. Among three tier groups, the schools from a higher tier group on average are more efficient than those from lower tiers, although variations in efficiency levels do occur within the same tier, which exist over different measures of efficiency.     

单片机温度数据采集与处理

介绍了用单片机控制温度数据的采集与信号处理的原理与技术，不仅省时省力，而且提高了实验精度．     

不精确数据的相似度及其在聚类分析中的应用

基本包含度理论，提出不精确数据的一种相似度，并讨论基于此相似度的不精确数据的聚类方法。     

Contrarian investment strategy with data envelopment analysis concept

One of the typical issues in financial literature is that the market tends to be overly pessimistic about value stocks, many of which are past losers. Therefore, over-reactions might capture by measuring earnings surprise vary with past return levels. In this paper, we propose a new index for an effective investment strategy to capture the return-reversal effect using both Data Envelopment Analysis (DEA) and Inverted DEA in order to consider the above characteristics of the market. Our investment strategy using the new index exhibits better performance than the naive return-reversal strategy that only uses past returns or earnings surprise. In addition, the correlations between our new index and commonly used value indices are insignificant, and the value indices cannot represent the over-valued (under-valued) situations perfectly. Hence, considering both proposed and value indices like book-to-price one, we could select value stocks more effectively than by using only one of these indices.