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Dynamic h-Index: The Hirsch Index in Function of Time

机译:动态h指数:时间函数中的Hirsch指数

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摘要

When there are a group of articles and the present time is fixed we can determine the unique number h being the number of articles that received h or more citations while the other articles received a number of citations which is not larger than h. In this article, the time dependence of the h-index is determined. This is important to describe the expected career evolution of a scientist's work or of a journal's production in a fixed year. We use the earlier established cumulative n~(th) citation distribution. We show that h = ((1-a~t)~(α-1)T)~(1/α) where a is the aging rate, α is the exponent of Lotka's law of the system, and T is the total number of articles in the group. For t = + ∞ we refind the steady state (static) formula h = T~(1/α), which we proved in a previous article. Functional properties of the above formula are proven. Among several results we show (for α, a, T fixed) that h is a concavely increasing function of time, asymptotically bounded by T~(1/α).
机译:当有一组文章且当前时间固定时,我们可以确定唯一编号h为获得h或更多引用的文章数,而其他文章获得的引用数不超过h。在本文中,确定了h指数的时间依赖性。这对于描述固定年份内科学家的工作或期刊产品的预期职业发展非常重要。我们使用较早建立的累积第n次引用分布。我们证明h =((1-a〜t)〜(α-1)T)〜(1 /α)其中a是老化率,α是系统的洛特卡定律的指数,T是总和组中的文章数。对于t = +∞,我们重新推导了稳态(静态)公式h = T〜(1 /α),我们在上一篇文章中对此进行了证明。以上配方的功能特性得到证明。在几个结果中,我们表明(对于α,a,T固定),h是时间的凹函数,由T〜(1 /α)渐近限定。

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