高速高阶可编程数字滤波技术与实现

本文讨论了频率范围宽,连续可调的高速高阶数字滤波技术及其工程实现。运用IMSA100级联信号处理技术和8097BH单片机可编程控制技术,实现了数字滤波中心频率在50～500000Hz,数字滤波归一化带宽在7‰～5%范围内连续可变的功能。应用该技术所研制的数字滤波设备在卫星测控遥测系统中获得了良好的效果。     

含各向异性介质的三维不均匀涡流场有限元法计算

本文用有限元法分析、计算含各向异性介质的三维不均匀涡流场。按加权余量法导出了对应的等价变分式及矢量磁位的三个分量式。采用三棱柱单元离散,研究出系数矩阵建立的方法并导出上机计算公式。     

Fuzzy concepts in expert systems

The authors present a comprehensive expert-system building tool, called System Z-II, that can deal with exact, fuzzy (or inexact), and combined reasoning, allowing fuzzy and normal terms to be freely mixed in the rules and facts of an expert system. This fully implemented tool has been used to build several expert systems in the fields of student curriculum advisement, medical diagnosis, psychoanalysis, and risk analysis. System Z-II is a rule-based system that uses fuzzy logic and fuzzy numbers for its inexact reasoning. It uses two basic inexact concepts, fuzziness and uncertainty, which are distinct from each other in the system     

国内外工业炉发展趋势

介绍了６０年代中期以来，由于冶金工厂轧制设备生产能力的不断提高、对坯料或产品加热质量的严格要求、不定形耐火材料的发展和节省能源的要求，以及计算机技术的发展所导致的国内外工业炉在设计、炉型、砌筑、环保和热工过程控制等方面的发展趋势。     

Simplified power control method for cellular mobile communication

The centralised power control (CPC) method measures the gain of the communication links between every mobile and every base station in the cochannel cells and determines optimal transmitter power to maximise the minimum carrier-to-interference ratio. The authors propose a simplified power control method which has nearly the same performance as the CPC method but which involves much smaller measurement overhead     

A syntax-directed translation for the synthesis ofdelay-insensitive circuits

A syntax-directed translation procedure for the synthesis of delay-insensitive circuits from graph-theoretic specifications is presented. No isochronic fork assumption is required for the correct operation of the synthesized circuits. The synthesized circuits are different from those obtained from Ebergen's synthesis method. In Ebergen's circuits, the voltage levels of a set of wires are used to encode which input events are most recently received. Special circuit elements (the N-element or the RCEL element) and two-phase to four-phase converters are needed to change the voltage levels of the encoding wires when input events are received. In the circuits obtained from the method in this paper, the wires encoding which input events are most recently received are the outputs of the toggles. When input events are received, they are sent directly or via demultiplexers to the toggles to change the voltage levels at their outputs. Two-phase to four-phase converters are not needed. The synthesis method is compared with Ebergen's synthesis method     

The impact of cultural collectivism on reward allocation.

Two studies, with 224 American and 240 Chinese university students, tested the idea that the collectivism of a culture leads to different styles of reward allocation with in- and out-group members. The 1st study used an out-group situation, in which Ss were led to believe that they worked with a partner whom they would not meet, to obtain a group reward. The collectivistic Chinese Ss were found to follow the equity norm more closely in dividing the group reward than the individualistic American Ss when pressure of social evaluation was removed. In the 2nd study, Ss read a scenario in which an allocator worked with either an in- or out-group member. The allocator had either a low or high input and used either the equity or equality norm to divide a group reward. Compared with American Ss, Chinese Ss liked an allocator who divided the group reward equally with an in-group member more and regarded such an allocation as fairer. When Ss were asked to assume that they were the allocator and to hypothetically divide the reward, Chinese Ss followed the equity norm more closely than did American Ss when the recipient was an out-group member or when the Ss' input was low. However, when Ss' input was high and the recipient was an in-group member, Chinese Ss followed the equality norm more than did American Ss. Findings are discussed in terms of the desire for maintaining group solidarity in a collectivist culture. (42 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Estimation of changes in single muscle fibre diameter in different solutions by diffraction studies

Studies of the effects of varying tonicity on the contraction of muscle fibres requires a knowledge of the corresponding changes in fibre diameters, if the observed mechanical changes are to be attributed to various factors, including that of the interfilamental spacing. Hitherto, measurements of such changes in fibre diameters involved tedious measurements of the diameters of the fibres at numerous points along its length. We now describe a technique whereby the change in fibre diameter can be deduced from measurements of the corresponding intensity ratio of laser diffraction lines when the fibre is bathed in solutions of differing tonicities.     

鲁棒稳定性和鲁棒对角优势的关系

本文研究了多输入多输出系统的鲁棒稳定性和鲁棒对角优势的关系.不仅给出了使系统 鲁棒对角优势所需的鲁棒稳定性条件,而且还得出了系统鲁棒对角优势一定保证系统鲁棒稳 定这个一般性的结论.并可根据本文所给的结果,对允许摄动的最大边界进行估计,包括非结 构摄动的范数上界和结构性摄动的摄动矩阵的各元素的模的估计.本文得出的鲁棒对角优势 保证鲁棒稳定的结果是较少保守性的.     

A new method to support UMTS/WLAN vertical handover using SCTP

This article proposes a new method to facilitate seamless vertical handover between wide area cellular data networks such as UMTS and WLANs using the stream control transmission protocol (SCTP). The multihoming capability and dynamic address configuration extension of SCTP are applied in UMTS/WLAN overlay architecture to decrease handover delay and improve throughput performance. Unlike techniques based on mobile IP or session initiation protocol, the SCTP-based vertical handover scheme does not require the addition of components such as home/foreign agents or a SIP server to existing networks. Therefore, the proposed scheme provides a network-independent solution preferred by service providers. Performance evaluations are presented to demonstrate the effectiveness of the proposed scheme.