内屏蔽铁路数字信号电缆的设计与制造

主要介绍了内屏蔽铁路数字信号电缆的设计、生产工艺要点，并结合生产实践讨论了如何进行质量控制。     

Strategyproof Mechanisms towards Dynamic Topology Formation in Autonomous Networks

In autonomous networks, cooperations among nodes cannot be assumed, since each node is capable of making independent decisions based on their personal preferences. In particular, when a node needs the help of intermediate nodes to relay messages to other nodes, these intermediaries may be reluctant to contribute their network resource for the benefit of others. Ideally, the right amount of incentives should be provided to motivate cooperations among autonomous nodes so that a mutually beneficial network results. In this paper, we leverage the power of mechanism design in microeconomics to design a distributed incentive mechanism that motivates each node towards a more desirable network topology. Since network parameters and constraints change dynamically in reality, the desirable topology can vary over time. Our solution presented in this paper has successfully encompassed such a dynamic nature of the network topology. In addition, we have transformed our solution to an easy-to-implement distributed algorithm, that converges towards the globally optimal topology. Selwyn Yuen obtained his BASc from the University of Waterloo Systems Design Engineering in 2002. He subsequently joined the Department of Electrical and Computer Engineering at the University of Toronto, where he completed his MASc in Computer Engineering in 2004. His Master thesis focuses on applying game theory and mechanism design in peer-to-peer and wireless networks. His other research interests include Artificial Intelligence, Optimization, Network Protocol Design, Distributed Algorithms, Operating Systems, as well as modelling and simulation of the Stock Market. Baochun Li received his B.Engr. degree in 1995 from Department of Computer Science and Technology, Tsinghua University, China, and his M.S. and Ph.D. degrees in 1997 and 2000 from the Department of Computer Science, University of Illinois at Urbana-Champaign. Since 2000, he has been with the Department of Electrical and Computer Engineering at the University of Toronto, where he is currently an Associate Professor and holds the Bell University Laboratories Endowed Chair in Computer Engineering. In 2000, he was the recipient of the IEEE Communications Society Leonard G. Abraham Award in the Field of Communications Systems. His research interests include application-level Quality of Service provisioning, wireless networks, and overlay networks.     

Perfect reconstruction of uniform samples from K-th order nonuniform samples

In this paper, we propose a new discrete-time model which relates uniform samples and K-th order nonuniform (KONU) samples. Typically, such situations may occur in practice where the sampling rates of analog-to-digital converters (ADCs) in a cluster of sensors may be different. This paper also outlines a digital signal processing approach to reconstructing uniform samples from the nonuniform samples produced by time interleaving analog-to-digital converters (TI-ADCs) with different sampling rates and time-mismatches.     

Efficiency of connected binary block designs when a single observation is unavailable

In this paper the problem of finding the design efficiency is considered when a single observation is unavailable in a connected binary block design. The explicit expression of efficiency is found for the resulting design when the original design is a balanced incomplete block design or a group divisible, singular or semiregular or regular with ₁>0, design. The efficiency does not depend on the position of the unavailable observation. For a regular group divisible design with ₁>0, the efficiency depends on the position of the unavailable observation. The bounds, both lower and upper, on the efficiency are given in this situation. The efficiencies of designs resulting from a balanced incomplete block design and a group divisible design are in fact high when a single observation is unavailable.The work of the first author is sponsored by the Air Force Office of Scientific Research under Grant AFOSR-90-0092.On leave from Indian Statistical Institute, Calcutta, India. The work of the third author was supported by a grant from the CMDS, Indian Institute of Management, Calcutta.     

公共建筑空调系统节能设计浅析

公共建筑空调系统能耗在建筑能耗中占的比重相当大,因此,公共建筑空调系统的节能对于节能减排有非常重要的意义。从公共建筑空调系统的设计角度分析空调系统节能的方法,提出了降低公共建筑空调系统能耗的节能设计方法。     

Binary code compression algorithm used for the real time compensation of the modulation error in miniaturized FOG

This paper presents a kind of novel binary code compression algorithm to reduce the size of the signal processing circuit and to realize real time compensation for the modulation error in fiber optic gyroscope (FOG). The disadvantage of general compensation method is figured out firstly. The modulation error is modeled and analyzed with taking the closed-loop characteristics into consideration. The analysis indicates the condition in which the error compensation is effective and real time. Then the compensation algorithm based on binary code compression operation is described. The functional design of the algorithm is realized in a single field programmable gate array (FPGA) by using modular design method, substituting some harewares in signal processing circuit, and system speed is very fast. The simulation and experiment results suggest that the algorithm and implementation is valid. The modulation error is real time compensated in every error detection cycle, and the error compensation resolution is enhanced from 2⁻¹⁰ to 2⁻¹⁶ rad/V.     

软件性能测试解析与优化

软件性能测试是检测系统性能瓶颈、提升软件质量的重要手段。目前,对性能测试的研究一般都停留在某些特定的技术上,没有形成系统的测试方法论,导致大多数测试人员仅仅掌握了一些零散的性能测试知识,缺乏测试的规范性和逻辑性．测试效果不理想。为了将缺陷和错误消灭在萌芽之中,从软件工程的角度出发,对性能测试方法论进行研究．概要指出性能测试应该是软件设计过程的一个必备环节。根据实际的性能设计经验,提出了性能设计的基本要求和主要过程。为软件测试人员提供了软件测试的过程依据,并提出了软件测试的优化方案,提高了软件测试的效率。     

LTE-A中新载波类型标准化研究

由于LTE-A系统中后向兼容载波上控制信令和参考信号（RS）的大量存在,导致频谱效率的降低和异构网场景中RS的干扰.为了解决上述问题,提出了新载波类型的概念.对新载波类型的技术特点和优势进行了简要介绍,着重分析了载波聚合场景中使用的非同步的新载波类型的控制信道设计以及参考信号设计尤其是小区特定参考信号和解调参考信号的设计,介绍了同步新载波类型的特点和相关问题的解决方案.在LTE-A系统的演进过程中起到了重要的参考作用.     

几种新型的Interleaver改进方案

针对interleaver的不同实现方案,介绍了几种新颖的改进结构。首先分析了改进方案的原理,之后对新旧结构的性能进行了比较,结果显示了新方案的性能优异性。这些新颖的设计无疑将对Inter-leaver的成熟商用起着极大的推动作用。     

并联机构激光加工系统创新设计

提出了一种新型的两自由度并联平动机构 ,并将其成功的应用到YAG激光加工平台当中。介绍了激光加工平台的组成及控制系统组成 ,同时还分析计算了该并联实验平台的自由度 ,推导建立了该机构的位置正、反解和速度解方程 ,给出了机构的工作空间分析及其雅可比矩阵 ,为激光加工平台提供了设计和控制的理论依据。经技术实施表明该新型加工平台具有结构简单、控制容易、作业空间大及可实现两维任意图形的加工等特点