MPEG家族新成员——MPEG-7

分析简要介绍了多媒体数据压缩标准MPEG的发展历程,重点介绍了MPEG-7这一新的多媒体信息编码标准的内容,并通过列举MPEG-7的应用,指出MPEG-7将对工业界以及人们的生活产生深远的影响:     

The effect of bile reflux on the intragastric pH

Oblective To observe the effect of bile reflux on the intragastric pH. Methods We used ambulatory intragastric pH monitoring along with simultaneous Bilitec 2000 to measure the pH and absorbance of the mixed gastric juice diluted with bile with increasing bilirubin concentration in vitro and the yellow and clear gastric juice aspirated under endoscopy. In vivo,we studied 20 functional dispepsia patients for 24 h with simultaneous intragastric pH and bilirubin monitoring. Results In vitro dilutions,the absorbance value reached to 0. 900 while the concentration was only 20% ,but when the pH of the solution was more than 4,it′s concentration was already up to 60％. The mean absorbance of the yellow gastric juice(0. 348± 0. 131) was significantly higher than that of the clear juice (0. 008 ± 0. 003)(P＜0.05). The pH of 80％ yellow gastric juice was less than 4, the percentage was not significantly different from the clear samples (81％) (P＞0. 05). The pH showed no correlation with the absorbance in the yellow and clear groungs. Eight of the 12 patients with the spontaneous nocturnal episcodes of alkalinization had simultaneous increase of absorbance,4 of the 8 subjects with no aikalinization had increase of absorbance. Gonclusion In some concentration,bile reflux affect little on the intragastric pH.     

Coordination of last train transfers using automated fare collection (AFC) system data

This paper studies last train coordination problem for metro networks, aiming to maximize the total number of passengers who can reach their destinations by metro prior to the end of operation. The concept of last boarding time is defined as the latest time that passengers can board the last trains and reach final destinations. The corresponding method for calculating last boarding time is also put forward. With automatic fare collection system data, an optimization model for coordinating last trains is proposed. The objective function optimizes the number of passengers who can reach their final destinations during the train period using departure times and headways of last trains for each line as decision variables. Afterwards, an adaptive genetic algorithm is put forward to solve this model and is applied to a case study of the Shanghai metro system. Copyright © 2017 John Wiley & Sons, Ltd.     

面向SoC设计的程序特征分析技术研究

文章提出一种基于SUIF中间表示的程序特征分析方法，能够有效地分析提取控制流特征、计算特征、操作数特征等程序特征，为SoC设计提供重要参考信息。基于该方法构建的程序特征分析框架具有良好的扩展性和灵活性。     

智能水下机器人发展现状及在军事上的应用

21世纪是海洋的世纪,水下机器人在军民领域均具有广泛的应用,智能水下机器人是水下机器人技术的发展方向。详细介绍了各国智能水下机器人的发展与研究现状,描述了未来无人化作战体系,分析智能水下机器人在未来无人化作战体系的军事应用,指出军用水下机器人未来的发展趋势。     

焊接速度对AH36船用高强钢焊接残余应力及其释放的影响

焊接件由于焊接速度不同,焊接残余应力分布存在很大差异,焊接残余应力在循环载荷作用下会产生释放现象,焊接残余应力存在对于结构安全性和稳定性有很大影响,有必要开展焊接速度对于焊接残余应力及其释放影响研究。基于ABAQUS软件二次开发建立平板对接焊试件焊接残余应力以及释放有限元模型,利用顺序耦合热力学数值仿真计算三种焊接速度下的焊接残余应力分布,并开展三种焊接速度下初始焊接残余应力在三种拉伸循环载荷作用下的释放情况研究。     

我国集装箱码头供求现状和预警方式

从1993年到2003年,我国港口行业持续高速增长。沿海主要港口货物吞吐量总量增长约190％,年均增速11.2％左右;外贸货物吞吐量总量增长约254％,年均增速13.5％左右;集装箱吞吐量总量增长14.5倍,年均增速约31.5％。     

我国环境规划理论体系初探

综合分析了我国环境规划的发展概况及作用,提出了目前环境规划方面存在的问题,并指出了将来发展的方向.     

珠海泥湾门大桥桩基施工质量事故的分析处理

本文主要分析泥湾门大桥桩基基身混凝土的质量缺陷和桩长不足两种质量问题产生的原因和处理方法。     

软土地基最终沉降量计算方法比较研究

堆载预压法处理软土地基的设计，沉降量的预估计算是否准确对工程影响很大。文中通过不同方法推算不同场地最终沉降量，对比分析了各种方法的优劣性。