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A new method for the calculation of time responses of lumped time invariant networks is presented. It is based on the numerical inversion of the Laplace transform and involves the computation of the frequency domain function at pre-assigned complex points and forming a weighted sum. The method exactly inverts a certain number of terms of the Taylor expansion of the time response and is thus equivalent to the methods used for the integration of differential equations. This equivalence is established on two examples. The order of integration can be changed between 1 and 46 without any difficulty. Additional properties resulting from the application of the numerical Laplace transform inversion are also discussed and some novel applications indicated. 相似文献
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Science & Education - Behind the creativities and innovations in human history, there lie the humble practices of multidisciplinary studies that drive new revolutionary ideas and unconventional... 相似文献
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A text to speech interface for Universal Digital Library 总被引：1，自引：0，他引：1
PRAHALLAD Kishore BLACK Alan 《浙江大学学报(A卷英文版)》2005,6(11):1229-1234
INTRODUCTION The objective of Universal Digital Library (UDL) is to capture all books in digital format (Universal Digital Library, 2005; Digital Library of India, 2005). Most of the digital information present in the digital world is accessible to a few who can read or under- stand a particular language. Language technologies can provide solutions in the form of natural interfaces so that digital content can reach the masses and fa- cilitate the exchange of information across differe… 相似文献
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A simple numerical method for computing the time domain response of linear time invariant systems described by their transfer functions is presented. The method does not require computation of transfer function poles or residues; it is not influenced by the multiplicity of poles or zeroes, nor does it require computation of the matrix exponential. Rather, it is based on a numerical method for inverting Laplace transforms. It is equivalent to very high order, absolutely stable numerical integration. Stiff systems present no problems. 相似文献
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Ram B. Sankar Pawan Kishore Tiwari Bijnan Bandyopadhyay Hemendra Arya 《Journal of The Franklin Institute》2021,358(12):6121-6135
The Mach number, angle of attack and altitude of operation for an interceptor vary widely during the course of its trajectory. As a result, the interceptor Center of Pressure (CP) locations move significantly around a given Center of Gravity (CG) location at these operating conditions. This results in an inevitable variation in aerodynamic static stability leading to stable and unstable operating regions. In order to ensure good speed of response during the interceptor homing phase, lesser static stability is desirable. Hence the requirement to handle aerodynamic instability at some other operating conditions in the interceptor envelope become inevitable. Since flexibility has a strong bearing on autopilot design, it becomes necessary to control unstable operating points in the presence of flexibility modes. Despite the static stability variation, aerodynamic design can control the level of maximum instability of the configuration. Hence the maximum static instability the autopilot can handle has to be specified for aerodynamic configuration design. This paper brings out the limitations of autopilot design in controlling an unstable interceptor with low bending mode frequencies in terms of maximum instability the autopilot design can handle, which serves as an important input for aerodynamic design. 相似文献
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Deborah Delaney Tyge-F. Kummer Kishore Singh 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(2):902-920
The purpose of this study is to examine the impact of the use of an online discussion board as an assessment item on students learning performance in relation to group work based on Social Learning Theory. The study uses survey questionnaires at the beginning and end of semester together with student grade information. The data analysis consists of (1) a regression analysis to explore the relationship between student interaction and performance and (2) a repeated measures ANOVA to explore changes in attitude and perceived encouragement. Student's perceptions at the outset were found to be important as was the use of the online discussion board as a learning tool even when it is not assessed. Further, students' attitude to the online discussion board improved through the semester however the online assessment task did not encourage domestic students to be more engaged in group-based activities. In contrast, international students were more encouraged to participate in group-based activities at the end of the semester. The study has implications for online group activities in education. 相似文献
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Kishore Dutta 《Resonance》2010,15(12):1097-1110
We explain the physical motivation for studying the collective coherent motion of large numbers of self-propelled biological
organisms. Starting from a well-known discrete model, we discuss the fundamental microscopic mechanisms leading to collective
behavior in bird flocks, and how appropriate behavioral rules for the individuals can determine specific features of the aggregation
at the group level. We further discuss the theoretical, experimental, and computational effort undertaken to explore this
phenomenon together with possible directions for future research in this area. 相似文献
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文章基于"指代消解"、"文本外部特征"、"图排序"的混合方法实现多语言多文档新闻摘要系统。该系统由四大模块组成,分别为:原文预处理;基于文本外部特征的摘要计算;基于图排序的摘要计算与;摘要生成模块。首先对新闻文本进行预处理和指代消解,然后在第二模块使用文本外部特征(如:主题词、线索词语、关键词与其同义词、时间、地点、命名实体等)来计算原文中句子的重要程度,句子与新闻主题的相关度,并且对每个句子第一次打分。然后在第三模块采用图排序的算法再从原文中计算句子之间的连贯程度,并且第二次对每个句子打分。最后在第四模块通过两个不同算法的得分计算原文中句子的总得分并且按原文中句子出现的顺序摘出新闻文本的摘要。文章以汉语、英语、孟加拉语为例,实现该系统并进行摘要测试。实验表明系统能够从三个不同语种的多文档新闻文本中有效地摘出摘要。 相似文献
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The expression of chromosomal genes is regulated by posttranslational modification of both histone and nonhistone chromatin
proteins and ATP-dependent remodeling of chromatin. Dysfunction of the modification and remodeling machineries can lead to
several diseases, which include cancer, cardiac hypertrophy, and asthma. Many genetic diseases can also lead to malfunction
of the machinery. The enzymes responsible for chromatin organization are the new targets for therapeutics. Inhibitors and
activators of histone acetyltransferases and inhibitors of histone deacetylases may serve as new generation drugs. 相似文献