检索结果-南通市图书馆

2006 10th International Conference on Communication Technology（ICCT 2006）

作者： Junjie Yang Hao Zhang Zhengyi Shi Faculty of Computer & Information engineering shanghai university of Electric Power shanghai china tong Ye Department of Electronic engineering shanghai jiao tong university shanghai china

This paper addresses the performance of fixed wavelength converters （FWCs） in resolving optical packet contentions. In order to realize an acceptable packet loss performance, a structure called AFWC （Array of Fixed Wavelength Converters） is proposed. The function of an AFWC is similar to that of a group of tunable wavelength converters, however, it can be shared among all input wavelength channels. The performances of an optical packet switch with AFWCs are evaluated by simulation experiments.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A HMM and Grey Model Based ERL Forecasting Method

A HMM and Grey Model Based ERL Forecasting Method

引用

The 8th International Conference on Reliability,Maintainability and Safety(ICRMS 2009)

作者： Ying Peng Department of Industrial engineering and Management School of Mechanical engineering shanghai jiao tong university shanghai 200240 china Ming Dong Department of Operations Management Antai College of Economics & Management shanghai jiao tong university shanghai 200052 china

＜正＞This paper presents a hidden Markov model（HMM） based prognosis method for prediction of equipment health. HMM allows modeling the time duration of the hidden states and therefore is capable of *** estimated state duration probability distributions can be used to predict the remaining useful life of the *** previous HMM based prognosis algorithm assumed that the transition probabilities are only state-dependent That is,the probability of making transition to a less healthy state does not increase with the *** the proposed method,in order to characterize a deteriorating machine,an aging factor that discounts the probabilities of staying at current state while increasing the probabilities of transitions to less healthy states will be *** the estimation of the aging factor,a grey model is used to calculate the expected residual life（ERL）by redefining the hazard *** the equipment health prognosis,we can predict the behavior of the equipment condition.

关键词： Prognosis model Hidden Markov model Hazard rate Grey model Expected residual life

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Analysis of Field Performance of Embankments on Soft Clay Deposit with and without PVD-Improvement

Analysis of Field Performance of Embankments on Soft Clay De...

引用

作者： SHEN Shui-long~1,CHAI Jin-chun~2 HONG Zhen-shun~3,CAI Feng-xi~1 (1.School of Naval Architecture,Ocean and Civil engineering,shanghai jiao tong university,shanghai 200030,china 2.institute of Lowland Technology,Saga university,Saga 840-8502,Japan 3.institute of geotechnical engineering,Southeast university,Nanjing 210096,china)

This paper presents a case history of the performance of two full-scale test embankments constructed on soft clay deposit in the eastern coastal region of *** embankment was constructed on natural subsoil and the other was constructed on prefabricated vertical drain(PVD) improved *** thickness of the soft clay deposit without PVD-improvement was 19m and with PVD-improved case was 23 *** PVDs were installed to a depth of 19m with spacing of 1.5m in a triangular *** performance of the two embankments was analyzed using the finite element *** following influential factors:①hydraulic conductivity of subsoil in field and②discharge capacity of PVDs were investigated *** back-analyzed results for the embankment on natural subsoil showed that the hydraulic conductivity ratio(C) of field to laboratory values is about *** analyse the PVD-improved subsoil,a simple approach using the equivalent vertical hydraulic conductivity of PVD-improved subsoil was *** analytical results show that PVDs in creased the bulk vertical hydraulic conductivity of soft subsoil by about 30 times compared to the original nontreated *** discharge capacity of PVDs in this field case is 79～100m/a,which is consistent with the findings from laboratory tests and other reported values in literature.

关键词： embankment construction soft subsoil PVD-improvement FEM analysis hydraulic conductivity

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

逆作法深基坑对周边保护建筑影响的实测分析

引用

土木工程学报 2009年第10期42卷 88-96页

作者：徐中华王卫东王建华华东建筑设计研究院上海200002 上海交通大学上海200030

分析上海软土地区的一个全逆作法深基坑施工对周边三幢历史保护建筑物的影响。简要地介绍该工程的地质条件、基坑施工前周边建筑物的现状、基坑围护方案、施工工况与监测情况。对监测结果的分析表明基坑开挖前的连续墙施工、工程桩施工... 详细信息

分析上海软土地区的一个全逆作法深基坑施工对周边三幢历史保护建筑物的影响。简要地介绍该工程的地质条件、基坑施工前周边建筑物的现状、基坑围护方案、施工工况与监测情况。对监测结果的分析表明基坑开挖前的连续墙施工、工程桩施工和降水等前期工程活动显著地影响周边建筑物的沉降,且此阶段的沉降奠定了建筑物的变形形态。建筑物沉降形态与建筑物各点距基坑的距离、建筑物本身的上部刚度和基础形式密切相关,且基坑变形的三维效应显著地影响建筑物的沉降形态。分析建筑物的上拱和凹陷变形。建筑物最大倾斜量为1/667,基坑施工过程中建筑物的原有裂缝基本未见进一步发展,表明本工程的逆作法方案及相关保护措施有效地保证了周边建筑物的安全。

关键词：深基坑软土逆作法建筑物沉降

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Investigation of the Inside Air Quality for Different Types of Air Conditioned Vehicles

Investigation of the Inside Air Quality for Different Types ...

引用

第二届亚洲制冷空调大会

作者： Wen Yuangao Lian Zhiwei Li Zhihua Liu Hongmin Wuhan university of Science and Technology, Wuhan 430070 institute of Refrigeration and Cryogenics engineering, shanghai jiao tong university,shanghai 200030

The inside microenvironment parameters for different types of air conditioned vehicles in shanghai weremeasured, which include bus, subway and light railway These parameters measured are temperature, humidity,CO, CO, and formaldehyde. The results show that the inside-vehicle temperature and humidity for thesevehicles can basically meet the needs of human’s thermal comfort. However the inside-vehicle air qualitiesare very different. The air qualities for subway and light railway are much better than air quality for bus. COconcentration for bus is up to 3223ppm, CO 18ppm, and formaldehyde higher. Therefore, air quality for busshould be improved.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

一拖三变频空调系统建模方法及控制研究

引用

系统仿真学报 2004年第10期16卷 2123-2127页

作者：陈武蔡振雄周兴禧集美大学轮机工程学院福建厦门361021 上海交通大学机械与动力工程学院上海200030

一拖多变频空调系统由于各蒸发器状态参数间的相互影响,使得系统的控制特性相当复杂,也增加了对系统进行动态建模的难度。为此,本文以一拖三系统为例,采用集总参数法,建立起系统的动态热力学模型;同时提出了系统中变频压缩机和电子膨胀... 详细信息

一拖多变频空调系统由于各蒸发器状态参数间的相互影响,使得系统的控制特性相当复杂,也增加了对系统进行动态建模的难度。为此,本文以一拖三系统为例,采用集总参数法,建立起系统的动态热力学模型;同时提出了系统中变频压缩机和电子膨胀阀的控制策略,引入了吸气压力控制和以电子膨胀阀直接控制室温的思路;制定了带有调整因子的模糊控制方法;利用系统热力学模型对控制策略和方法进行仿真研究,仿真结果表明所提出的控制策略和方法是有效可行的,能取得满意的控制效果。

关键词：一拖三系统动态热力学模型控制吸气压力

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

MR Image Texture Analysis for Prediction of the Firmness of Huanghua Pears (Pyrus Pyrifolia Nakai，cv． Huanghua) during Storage Using Artificial Neural Network

MR Image Texture Analysis for Prediction of the Firmness of ...

引用

中国园艺学会第八届青年学术讨论会暨现代园艺论坛

作者： Ran Zhou~1 Yunfei Li~(2*) (1 institute of Refrigeration & Cryogenic engineering,shanghai jiao tong university,shanghai,201101 2 Department of Food Science & Technology,shanghai jiao tong university,shanghai,200240)

Firmness,a main index of quality changes,is important for the quality evaluation of fruits,in the present study,texture analysis (TA) of magnetic resonance images was applied to predict firmness of Huanghua pears (Pyrus pyrifolia Nakai,***) during storage using an artificial neural network (ANN).Seven co- occurrence matrix-derived TA parameters and one run-length matrix TA parameter significantly correlated with firmness were considered as inputs to the *** ANN models were evaluated when developing the optimal *** optimal ANN model consisted of one hidden layers with seventeen neurons in the hidden *** model was able to predict firmness of pears with a mean absolute error of 0.539 N and R=*** data showed the potential of TA parameters of MR images combined ANN for investigations of internal quality characteristics of fruits during storage.

关键词： Magnetic Resonance Imaging Texture Analysis Artificial Neural Network Huanghua Pears Firmness

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Continuous Finite Time Control for Stewart Platform with Terminal Sliding Mode

Continuous Finite Time Control for Stewart Platform with Ter...

引用

第二十六届中国控制会议

作者： Zhao Dongya 1,3,Li Shaoyuan 1,Gao Feng 2 1.institute of Automation,shanghai jiao tong university,shanghai 200240,P.R.china2.School of Mechanical engineering,shanghai jiao tong university,shanghai 200240,P.R.china3.College of Mechanical & Electronic engineering,china university of Petroleum,Dongying Shandong 257061,P.R.china

This paper presents a continuous finite time stability control method for Stewart Platform with terminal sliding *** considering the dynamics of legs of Stewart Platform as uncertainty,the sliding mode can be reached in a finite time then the position tracking error can converge to a residue set around zero in a finite *** demonstrates the effectiveness of this approach.

关键词： Finite Time Stability Stewart Platform Terminal Sliding Mode

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Non-Invasive Determination of Bruises of Huanghua Pears (Pyrus Pyrifolia Nakai,cv. Huanghua) by MRI

Non-Invasive Determination of Bruises of Huanghua Pears (Pyr...

引用

中国园艺学会第八届青年学术讨论会暨现代园艺论坛

Magnetic resonance imaging (MRI) was used for nondestructive evaluation of bruising of Huanghua pears (Pyrus pyrifolia Nakai,***).The bruises of pears which were respectively stored in room temperature (about 23℃),4℃and controlled atmospheric condition (6% O and 2% CO at 4℃) were detected and distinguished by *** MRI sequences have been *** relaxation rates (T and T) of the bruised regions were found to be significantly different from those of normal tissue which is caused by water distribution of the tissue (P<0.05).In addition,the results achieved in this study still show the potential of MRI as a tool for analyzing the internal quality of pears.

关键词： Huanghua pears Bruises MRI T1 T2

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Anisotropic neuro-mechanical compensation for kinematic variability in multi-joint arm postural control

Anisotropic neuro-mechanical compensation for kinematic vari...

引用

中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Xin HE,Yu-Fan DU,Xin WANG,Ning LAN~* Laboratory of Neuro-modulation and Modeling,institute of Rehabilitation engineering,The Med-X Research institute, School of Biomedical engineering,shanghai jiao tong university,shanghai 200030,china

＜正＞Objective The purpose of this study is to analyze the efficiency of neuro-mechanical compensation for kinematic variability during postural *** dependent noise（SDN） in natural neuromuscular recruitment brought intrinsic instability in posture maintaining ***,random drifting of human arm endpoint was substantially suppressed by neuro-mechanical compensation and reflex regulation in normal subjects,and it may become notable in pathological conditions like Parkinson’s *** the efficiency of neuro-mechanical compensation for kinematic variability may help us find out the control principals our brain adopted in position control,and maybe helpful for rehabilitation treatment planning for patients with motor *** We use a realistic virtual arm（VA） model to address this issue through a computational *** properties at muscle, joint,and hand coordinates were evaluated to obtain an estimation of mechanical *** between muscle stiffness and SDN were simulated with simple patterns of feedfoward activation of *** resultant stiffness and drifting in hand were analyzed by principal components and characterized by elliptic *** （1） The extent of random hand drifting ellipse was inversely modulated by the hand stiffness ellipse.（2） Higher levels of muscle activation caused anisotropic increases of hand stiffness mainly in the major axis direction,consequently leading to anisotropic growth of hand drifting.（3） A U-shaped ratio against total muscular energy consumption between the area of hand endpoint stiffness ellipse and that of hand endpoint drifting ellipse,therefore,suggests thai it may not be efficient to counteract internal neural noise by using high levels of muscle stiffness（activation） in multijoint *** A suitable level of muscle stiffness may be optimal in maintaining a steady arm posture with minimal variation.

关键词： muscle stiffness neural noise kinematic variability multi-joint arm posture control

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：