B-K方程的莫德列夫修正式系数的约束条件  

On the Restraint Conditions of Coefficient of B-K Equation Modified by МОТIЛеВ

作　　者：陈京莲[1] 

机构地区：[1]井冈山大学图书馆,江西吉安343009

出　　处：《现代情报》2009年第9期15-16,24,共3页Journal of Modern Information

摘　　要：B-K方程的莫德列夫修正式是研究文献老化的重要方法之一。但人们在使用该修正式时混淆了公式中系数的约束条件。本文从B-K方程的莫德列夫修正式出发,详细讨论了公式中系数的约束条件以及它的科学意义。经过严格的数学推导得出B-K方程的莫德列夫修正式中系数a,b的第一个约束条件是ae0.1+be0.2=1,另一个约束条件为0≤a≤2e0.1且1-2e0.1≤b≤1。认为第一个约束条件的意义是初始化约束条件,第二个约束条件的意义是文献的老化来源于文献的不断增加和文献自身的老化。B- K equation modified by MOTLЛeB is an important method to study literature obsolescence. However, the restraint conditions of coefficients of modified B - K equation were confused when it was studied. The restraint conditions of a and b in the modified equation and its meanings were discussed in this paper. By way of strict mathematic derivation the restraint conditions of a, b is ae^0.1 ＋ be^0.2 = 1, 0≤ a ≤2e^0.1 and 1 - 2e^0.1 ≤ b ≤ 1 in modified B - K equation, respectively. It was thought that the science meaning of the first restraint condition was an initial restraint condition; the second was thought that literature obsolescence resulted from increasing literature and value of literature itself decreasing with time.

关 键 词：文献老化 B—K方程的修正式 约束条件 

分 类 号：G350[文化科学—情报学]