LTI因果系统零状态响应与卷积

对于线性时不变(LTI)因果系统,其系统单位冲激响应h(t)应满足h(t)=h(t)u(t),尽管卷积公式有∫∞-∞x(τ)h(t-τ)dτ=∫∞-∞h(τ)x(t-τ)dτ,但是,上式中h(t-τ)是非因果,所以,公式∫∞-∞x(τ)h(t-τ)dτ不满足实际物理系统。通过实际信号作用于系统的讨论和分析,揭示了在任意时刻的系统零状态响应和满足实际物理系统的卷积∫∞-∞x(τ)h(t-τ)dτ的物理意义。     

连续时间LTI系统特征函数分析法

笔者利用微分算子推导出了线性时不变连续时间系统的特征函数,并对特征函数在系统的时域分析中的应用作了阐述.     

"信号与系统"课程教学中的几点思考

"信号与系统"是电子信息类专业的一门核心基础课,为了有效地上好该课程,需要进行教学改革。一方面,要组织好教学内容;另一方面,要针对教学内容采用相应的合适的教学方法。为此我们进行了教学改革,教学实践的结果表明我们的改革是有效的,本文总结了我们在教学过程中的几点思考。     

Bringing a Small Academic Library Back from the Brink

Abstract

When Villa Madonna College moved from Covington to Crestview Hills, Kentucky in 1968 to become Thomas More College, the designers of the new campus knew that the library would be a vital component of academic success for future students. As Thomas More transitioned from “College” to “University” in 2018, the library had unfortunately endured a long slow decline. With a recent renaming to the “Benedictine Library” in 2017, administration knew that more substantial changes were needed. In April 2018, the library started a new course with the 16^th Library Director in institutional history. This column illustrates the ambitious first two years of the new library administration, and details the work completed in the library’s “digital modernization plan”.