检索结果-内蒙古大学图书馆

作者： Ren, Jian Yan, Dawei Zhai, Yang Mou, Wenjie Gu, Xiaofeng Key Laboratory of Advanced Process Control for Light Industry Ministry of Education Department of Electronic Engineering Jiangnan University Wuxi214122 China

Lattice-matched Pt/Au-In0.17Al0.83N/GaN hetreojunction Schottky barrier diodes (SBDs) with circular planar structure have been fabricated. The electrical characteristics of InAlN/GaN SBD, such as two-dimensional electron gas (2DEG) density, turn-on voltage, Schottky barrier height, reverse breakdown voltage and the forward current-transport mechanisms, are investigated and compared with those of a conventional AlGaN/GaN SBD. The results show that, despite the higher Schottky barrier height, more dislocations in InAlN layer causes a larger leakage current and lower reverse breakdown voltage than the AlGaN/GaN SBD. The emission microscopy images of past-breakdown device suggest that a horizontal premature breakdown behavior attributed to the large leakage current happens in the InAlN/GaN SBD, differing from the vertical breakdown in the AlGaN/GaN SBD. © 2015 Elsevier Ltd.

关键词： Aluminum gallium nitride

来源：评论

学校读者我要写书评

暂无评论

DV-Hop Localization Algorithm based on Hop Distance Weight and Improved Particle Swarm optimization

DV-Hop Localization Algorithm based on Hop Distance Weight a...

引用

2021 China Automation Congress, CAC 2021

作者： Yang, Ziqin Gao, Meifeng Key Laboratory of Advanced Control of Light Industry Process Ministry of Education School of Internet of Things Engineering Jiangnan University Wuxi China

ISBN: (纸本)9781665426473

For the purpose of overcoming the issue of lower localization accuracy in the DV-Hop localization algorithm, as well as addressing the problem that the Particle Swarm optimization (PSO) is easy to slip into local optimization, an enhancement strategy, which is based on hop distance weight and improved PSO, is proposed. The anchor node broadcasts information with a dual communication radius to obtain the optimal inter-node hop value;the proportion of the anchor node's average hop distance to the communication radius is utilized as the weight utilized to figure out the unknown node's average hop distance. The enhanced PSO is employed to calculate the unknown node's location, while the dynamic weight and golden sine algorithm are employed to update the position of particles. On the basis of the simulation results, it is manifest that the proposed calculation has superior localization precision. © 2021 IEEE

关键词： Particle swarm optimization (PSO)

来源：评论

学校读者我要写书评

暂无评论

Anti-collision algorithm for RFID tag identification using fast query tree

Anti-collision algorithm for RFID tag identification using f...

引用

2011 IEEE International Symposium on IT in Medicine and education, ITME 2011

作者： Wang, Gang Peng, Yong Zhu, Zhaomin Key Laboratory of Advanced Process Control for Light Industry Ministry of Education China Department of Electronic Engineering Jiangnan University Wuxi China

ISBN: (纸本)9781612847023

A fast tag anti-collision algorithm named Fast Query Tree (FQT) is presented. FQT is an improved technique based on query tree algorithm, the novelty of FQT is that it use a counter and a pointer in each tag for tag transmission arbitration, owing to the counter and pointer, which on the other hand remembered the reader's query history, reader just needs to transmit the last bit of the current prefix. The simulated results show that FQT can achieve a better performance than other conventional tree-based algorithms in terms of communication overhead, identification delay and speed. © 2011 IEEE.

关键词： Trees (mathematics)

来源：评论

学校读者我要写书评

暂无评论

Prescribed-time distributed localization of multi-agent systems based on local bearing information

Prescribed-time distributed localization of multi-agent syst...

引用

第43届中国控制会议

作者： Yunkai Lv Huaicheng Yan Kai Rao Penghui Yang Key Laboratory of Advanced Control and Optimization for Chemical Process of Ministry of Education East China University of Science and Technology

ISBN: (数字)9789887581581

ISBN: (纸本)9798350366907

This work considers the localizability of multi-agent systems based on local bearing measurement.A novel prescribedtime orientation estimation algorithm is first proposed to guarantee that the local reference frame of the follower agent is aligned with the global *** orientation estimation algorithm is then applied to the problem of position estimation,and a prescribedtime distributed localization estimation algorithm is *** global convergence is derived based on the cascade *** simulation results are provided to prove the effectiveness of the proposed estimation methods.

关键词： Local bearing information orientation estimation prescribed-time

来源：评论

学校读者我要写书评

暂无评论

A Fast Algorithm for Reducing the Computation Burden of Model Predictive control

A Fast Algorithm for Reducing the Computation Burden of Mode...

引用

第25届中国过程控制会议

作者： Chao Chen Mei Hua Rongbin Qi Feng Qian Key Laboratory of Advanced Control and Optimization for Chemical Process （East China University of Science and Technology） Ministry of Education

Most of industrial model-based predictive control algorithms are suffering from heavy computation burden when solving QR optimizations and on-line matrixes multiplication within a limited sampling *** order to optimize this problem,a fast algorithm is proposed,which the real-time values are modulated into bit streams to simplify the multiplication as the bit based operation could extremely decrease the compute *** addition,the control variables are deduced from the prediction horizon to the current control actuation approximately by a recursive relation instead of figuring all of the control actuations out strictly to reduce the matrix dimension.

关键词： Fast MPC Algorithm Computation Burden Bit-Streams processing Dimension Reducing

来源：评论

学校读者我要写书评

暂无评论

Feed property identification of ethylene cracking based on improved fuzzy C-mean clustering algorithm

引用

Huagong Xuebao/CIESC Journal 2013年第12期64卷 4366-4372页

作者： Li, Jiawen Du, Wenli Li, Jinlong Qian, Feng Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education East China University of Science and Technology Shanghai 200237 China

In ethylene cracking process, the changes of feed have many kinds, and due to its expensive feed analyzer, little industrial site equips with it, so online recognition of oil property is important to achieve cracking online optimization. As the traditional fuzzy C-means algorithm is based on the membership of the strike Euclidean distance, the algorithm contains only the mean center, bringing the unity of clustering results. To take full advantage of effective information of cracking feed, this paper proposes a fuzzy membership set method based on hybrid probabilistic model, namely through the establishment of Gaussian mixture model to achieve describing the probability distribution of clustering sample's affiliation, and use EM algorithm to estimate the model parameter's pole maximum likelihood. The algorithm can not only consider mean center of the sample, but also effectively use sample covariance and the weight coefficient information for mode discrimination. Finally, the simulation is based on classic IRIS data clustering and ethylene cracking feedstock identification, verifying the method described in this paper in the index of dunn and Xiebieni is better than fuzzy C-means clustering algorithm, showing that the method is effective. © All Rights Reserved.

关键词： Clustering algorithms

来源：评论

学校读者我要写书评

暂无评论

Data-driven Scheduling optimization of Ethylene Cracking Furnace System

Data-driven Scheduling Optimization of Ethylene Cracking Fur...

引用

第32届中国控制与决策会议

作者： Xinwei Lin Liang Zhao Wenli Du Feng Qian Key Laboratory of Advanced Control and Optimization for Chemical Process Ministry of Education East China University of Science and Technology

The ethylene cracking furnace system convert a variety of hydrocarbon feeds into products such as ethylene and propylene in parallel. During the cracking process, the coke produced by the cracking will degrade the performance of the cracking furnace, so the furnace should be cleaned periodically. Scheduling of the cracking furnace system involves various raw materials, multiple furnaces, and multiple constraints, so it is a difficult mathematic programming problem. Previous studies have simplified the optimization model to obtain a corresponding mixed integer nonlinear programming（MINLP） model. In order to make the scheduling more suitable for the actual process, this paper develops the transfer-line exchanger（TLE） model, fuel consumption model, and super-high pressure steam（SS） model by using the actual plant data. A case study is put forward to demonstrate the effectiveness of the proposed method.

关键词： Ethylene cracking furnace system scheduling MINLP TLE

来源：评论

学校读者我要写书评

暂无评论

Modeling of ethylene cracking furnace yields based on transfer learning

引用

Huagong Xuebao/CIESC Journal 2014年第12期65卷 4921-4928页

作者： Zhou, Shuheng Du, Wenli Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education East China University of Science and Technology Shanghai200237 China

Ethylene cracker generally utilizes petroleum products as raw materials, and turn the long-chain hydrocarbon molecules into a variety of short chain hydrocarbons like gaseous hydrocarbons and a small amount of liquid hydrocarbons at high temperature, thereby obtaining ethylene, propylene and other products. Establishing the yield model for main products is of great significance to advanced control, operation optimization of the pyrolysis furnace in theory and practice. Due to the semi-continuous and periodic characteristics of cracking furnace, establishing a yield model for each condition is time-consuming. Considering the temperature, residence time and pressure have common effect on product yields, so this article uses these similarities exist in the new and old processes, supplemented with transfer learning to accomplish quick modeling for different conditions. Compared to previous studies, this method can be able to fully exploit the information contained in the historical data from a small amount of new data. Meanwhile, building a model of ethylene in the process of cracking furnace, case studies demonstrate the efficacy of the developed methodology. ©, 2014, chemical Industry Press. All right reserved.

关键词： Ethylene

来源：评论

学校读者我要写书评

暂无评论

Investigating impacts of cost functions to atmospheric dispersion modeling and source term estimation in turbulent condition

引用

Huagong Xuebao/CIESC Journal 2020年第3期71卷 1163-1173页

作者： Dong, Jikai Du, Wenli Wang, Bing Xu, Qiaoyi Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education East China University of Science and Technology Shanghai200237 China

Hazardous gas release will threaten social security and cause damage to property and environment. Establish an effective emergency response system with monitoring devices can help reduce the potential risk and provide evaluation for release accident emergencies. The gas concentration is detected by the gas concentration sensor arranged in the risk area, and the leakage assessment is carried out according to the meteorological conditions and the forward diffusion model. Because the data of leakage scenarios is not easy to obtain, the large eddy simulation method based on Fires Dynamics Simulator (FDS) is used in this paper to generate date through simulating release scenarios with turbulent condition. On this basis, the impacts of the cost function to the modeling process and source term estimation are studied. The results of source term estimation shows the function of the square sum of concentration deviation is better than other functions. However, the function cannot avoid the condition that the estimation index of some scenes is far from the average value because of turbulent flow. In addition, a combination of the estimation results of different cost functions can improve the situation to a certain extent. © All Right Reserved.

关键词： Cost functions

来源：评论

学校读者我要写书评

暂无评论

Self-adaptive iterative hybrid modeling and its application in acetylene hydrogenation process

引用

Huagong Xuebao/CIESC Journal 2018年第11期69卷 4814-4822页

作者： Guo, Jingjing Xu, Jinjin Du, Wenli Ye, Zhencheng State Key Laboratory of Chemical Engineering Key Laboratory of Advanced Control and Optimization for Chemical Processes of Ministry of Education East China University of Science and Technology Shanghai200237 China

The reaction mechanism of chemical process is complex. There is a modeling error between the mechanism model and the actual reaction system. At the same time, there are complex slow time-varying features, such as catalyst deactivation, fuel coking, etc. Thus there will be a mismatch between the process model and the actual process system. A self-adaptive iterative hybrid model (SAIHM) is established to reflect the dynamic characteristics of the process accurately over a long period. The mechanism model and the data-driven model are effectively combined to improve the prediction accuracy of the model;the data-driven model uses the deep recurrent neural network (DRNN) to fully exploit the timing relationship between adjacent conditions;the data-driven model is automatically updated based on the evaluation indicators to resolve the contradiction between accuracy and efficiency. The simulation and comparison results of the self-adaptive iterative hybrid model and the existing mechanism model established based on the historical operation data of an acetylene hydrogenation adiabatic reactor show that the self-adaptive iterative hybrid model can more effectively track the actual system. © All Right Reserved.

关键词： Dynamics

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：