洛克希德·马丁公司网络军工产业研究

洛克希德·马丁公司(以下简称“洛马”)是美国一家拥有百年历史的国防承包商,在百年发展历程中,洛马以美国国家安全需求为牵引,逐渐成长为世界最大军工集团。伴随网络时代的来临和新安全威胁的涌现,洛马加大网络空间作战技术的研发力度和资金投入,为美国加强网络国防能力建设铸剑护航。研究以洛马网络军工产业发展为脉络,对其网络安全全谱能力进行了综合梳理;同时,多角度分析了其创新的发展路径。     

一种改进的定时误差检测算法

定时恢复环路是数字接收机同步模块的一个重要组成部分,Gardner算法以实现结构简单,不敏感于载波相位,独立于调制方式等优点作为定时误差检测算法广泛应用于数字接收机的定时恢复环路中。鉴于Gardner算法在数字接收机定时同步中的广泛应用,并通过比较Gardner算法及其改进算法的定时抖动和捕获性能,研究了一种改进的Gardner定时误差检测算法。仿真结果表明,该算法对于MPSK恒包络的调制信号定时抖动性能有很明显的改善,并且在小滚降因子下改善仍然成立,但是对于16QAM非恒包络的调制信号改善不理想。     

QAM接收机的定时误差估计算法的研究

定时恢复是全数字接收机中的一项关键技术。以Gardner定时误差检测算法为基础,从理论上对算法的计算复杂度、以及整个定时恢复环路实现的难易程度对其进行分析。以64QAM为例对整个环路进行了仿真验证,该算法对载波相位不敏感,并且简单易行,适用于QAM信号的定时恢复。     

Analysis of transient multiexponential signals using exponential compensation deconvolution

A three-step procedure for the parameter estimation of transient multiexponential signals is proposed. The first step involves the use of the classical Gardner transform to convert the data signal into a convolution model which is deconvolved using exponential compensation deconvolution technique in the second step. In the third step, eigenvector algorithms are used to process the resulting complex exponentials to obtain better estimates of decay rates and number of components. Simulation and experimental results show that this method outperforms previous approaches if a number of preprocessing parameters are correctly selected.     

luther's thesenportal: a case study of a “ritual-architectural event”

ABSTRACT

This article is part of a larger field-based study of contemporary festivity and religious tourism in Lutherland, a geographic and symbolic place associated with the life and work of Martin Luther. My aim, with reference to the work of Lindsay Jones and Victor Turner, is to develop an approach for studying the intersection of material culture and ritual. Material culture does not simply signify into empty space, shining meanings into its surrounding environment as a street lamp does light. Rather, material culture is produced, handled, used in a variety of ways. An exemplary case for studying how built space and ritual performance intersect is the Thesenportal of Wittenberg's Schlosskirche, an object and performative space commemorating the origin of the German Reformation.     

‘The art of correctly painting the expressive lines of the human face’: Duchenne de Boulogne's Photographs of Human Expression and the École des Beaux-Arts

Abstract

Admired in their day as living anatomy, the strange, powerful photographs of human expression produced by or under the direction of Guillaume-Benjamin Duchenne de Boulogne (1806–75) functioned in two fields, medicine and fine art.¹ I would argue that these photographs' credibility in both fields derived from shared practices of ‘drawing from life’, practices laden with expectations of naturalism and legibility, as was photography in general at this time. While it was quite common during the nineteenth century that images made to serve the purposes of one of these fields were studied or circulated in the other, rarely were photographs given both scientific and artistic aims or, even less so, qualities, as Duchenne claimed for his work. Recent scholarship on Duchenne's work has tended to critique its perceived objectivity and scientific meaning by following Michel FoucauIt and unpacking the enlightened bourgeois modes of controlling, investing and understanding representations of the human body.² The exhibition catalogues published in 1999 by the Ecole nationale des beaux-arts and by the Los Angeles County Museum of Art discuss important aspects of the aesthetic context of Duchenne's photographs. However, neither one asked how and why his work was rejected by the French Academy of Fine Arts in 1863, only to become part of the fine art curriculum of the École des Beaux-Arts a decade later. To address those unstudied questions, I will examine relevant aspects of the photographs' creation, forms and functions, and their receptions by the scientific and art communities.     

Leading Lady: Monica Pidgeon,Editor of Architectural Design, 1946 to 1975

Peter Murray pays tribute to Monica Pidgeon (1913-2009). Editor of Architectural Design for almost three decades, Monica was responsible for establishing Architectural Design as the premier international architectural magazine. Murray highlights her immense contribution to architecture over the years, as well as evoking the experience of working for Monica as one of her ‘boys’, or technical editors. Copyright © 2010 John Wiley & Sons, Ltd.     

The Making of Early Republican Ankara

Zeynep Kezer outlines the ascendancy and development of Ankara from an obscure, central Anatolian town into a capital city that was to become the focus of the new nation state. Informed by German architectural and technological expertise, it was executed to rigorous Modernist planning principles and aesthetics, and came to represent in urban form the polarisation of pre-republican and republican Turkey. Copyright © 2010 John Wiley & Sons, Ltd.     

Hermon Wilkes Martin (1892–1997).

Memorializes Hermon Wilkes Martin, a pioneer of psychology in the South. Martin taught at Emory University for 40 yrs and led the formation of the Georgia Psychological Association. He was instrumental in the move to license psychologists and shepherded the inaugural bill to create the Georgia State Board of Examiners in Psychology through the state legislature in 1951. In addition, Martin founded the Howard School for children with attention deficit disorder. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

论海德格尔的思维方式与真理观

海德格尔真理观的独特性来自其独特的思维方式."生成"是海德格尔后期哲学思想的主导词语.与传统形而上学的表象性思维方式相比较,海德格尔的建构生成性思维方式以"生成"为核心,体现了"存在性原则";"澄明的无蔽",既充分展示了海德格尔独特的真理思想,又是其建构生成性思维方式的鲜明体现.