图像增强基本理论综述

图像增强是数字图像处理的最基本的方法之一,本文总结了图像增强的基本理论,并对新的图像增强的方法作了简单介绍。     

Asymmetric effects of households’ financial participation on banking diversification

This paper examines banks’ diversification–performance nexus from the perspective of demand, the magnitude of households’ financial participation, with bank data from 22 European countries over the period from 2002 to 2009. We argue that the magnitude of households’ financial participation develops asymmetric diversification effects on banks’ performance. The empirical investigation herein provides evidence for the asymmetric influence of households’ financial participation on the effect of banks’ income diversification on their performance. Our findings suggest that banks should take into account the deposit interest rates and the variety of households’ investment habits when they operate toward diversification.     

Automatic control system for uniformly paving iron ore pellets

In iron and steelmaking industry, iron ore pellet qualities are crucial to end-product properties, manufacturing costs and waste emissions. Uniform pellet pavements on the grate machine are a fundamental prerequisite to ensure even heat-transfer and pellet induration successively influences performance of the following metallurgical processes. This article presents an automatic control system for uniformly paving green pellets on the grate, via a mechanism mainly constituted of a mechanical linkage, a swinging belt, a conveyance belt and a grate. Mechanism analysis illustrates that uniform pellet pavements demand the frontend of the swinging belt oscillate at a constant angular velocity. Subsequently, kinetic models are formulated to relate oscillatory movements of the swinging belt’s frontend to rotations of a crank link driven by a motor. On basis of kinetic analysis of the pellet feeding mechanism, a cubic B-spline model is built for numerically computing discrete frequencies to be modulated during a motor rotation. Subsequently, the pellet feeding control system is presented in terms of compositional hardware and software components, and their functional relationships. Finally, pellet feeding experiments are carried out to demonstrate that the control system is effective, reliable and superior to conventional methods.     

浅谈高压电机叠频试验的研究

文章分析了叠频试验原理,并对变频电源提供试验的电源做比较,表明采用专用变频电源完成叠频法试验,可以实现试验自动化、智能化。     

基于OFDM的高速无线局域网标准IEEE 802.11a的同步和信道估计方法

介绍了基于OFDM的无线局域网标准IEEE802．11a的物理层相关OFDM参数和其基带IFFT实现原理，结合具体的分组结构，给出了其符号定时、载波频率偏移估计和信道估计方法，这也是一般OFDM系统的关键问题。     

The Effect of Investor Sentiment on Feedback Trading and Trading Frequency: Evidence from Taiwan Intraday Data

Abstract

Although extensive literature has suggested that investor sentiment may be one of the most important factors in explaining investor trading frequency and trading strategies, how individual investors are significantly influenced by sentiment remains underexplored. The feature of numerous individual investors in the Taiwan stock market provides an avenue to examine the relationship of investor sentiment to trading frequency and positive-feedback trading according to intraday data. Using a vector autoregression model to measure feedback trading in one-minute intervals, we find that trading frequency appears to increase in periods of rising market, suggesting that investor sentiment–driven trading increases market trading frequency without relying on past experiences to conduct trading behavior.     

OFDM技术的发展研究

随着通信技术的逐步发展成熟,OFDM技术作为一种重要的多载波调制技术应运而生。本文详细介绍了OFDM技术的基本原理和特性,并对其主要优点做了系统分析,描述了其应用前景。     

液压伺服系统频率响应计算机分析

频率响应法是分析液压伺服系统的一种较成熟的理论方法,本文介绍用计算机实现液压伺服系统的频率响应分析法,对给定任意形式的开环或闭环传递函数,可以通过计算机迅速进行其频率特性计算,并可打印出对数幅频和相频特性曲线。     

中国股市超高频持续期序列长记忆性研究

文章针对股票市场的超高频持续期序列，提出了长记忆随机条件持续期模型（LMSCD），并给出了模型参数的极大谱似然函数估计方法。然后，利用沪市浦发银行股票的超高频持续期数据，分别建立了交易持续期、价格持续期和交易量持续期的长记忆随机条件持续期模型，验证了中国股票市场超高频持续期序列长记忆性的存在。