检索结果-南通市图书馆

Method of data cleaning for network traffic classification

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2014年第3期21卷 35-45页

作者： WANG Ruo-yu liu Zhen ZHANG ling School of Computer Science and Engineering South China University of Technology

Network traffic classification aims at identifying the application types of network packets. It is important for Internet service providers （ISPs） to manage bandwidth resources and ensure the quality of service for different network applications However, most classification techniques using machine learning only focus on high flow accuracy and ignore byte accuracy. The classifier would obtain low classification performance for elephant flows as the imbalance between elephant flows and mice flows on Internet. The elephant flows, however, consume much more bandwidth than mice flows. When the classifier is deployed for traffic policing, the network management system cannot penalize elephant flows and avoid network congestion effectively. This article explores the factors related to low byte accuracy, and secondly, it presents a new traffic classification method to improve byte accuracy at the aid of data cleaning. Experiments are carried out on three groups of real-world traffic datasets, and the method is compared with existing work on the performance of improving byte accuracy. Experiment shows that byte accuracy increased by about 22.31% on average. The method outperforms the existing one in most cases.

关键词： network traffic classification byte accuracy elephant flow mice flow machine learning

Uniqueness and Least Energy Property for Solutions to a Strongly Coupled Elliptic System

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2017年第3期33卷 419-438页

作者： Shan ZHANG ling ZHOU Zu Han liu Department of Applied Mathematics Nanjing University of Finance & Economics Nanjing 210003 P. R. China School of Mathematical Science Yangzhou University Yangzhou 225002 P. R. China

For the strongly coupled system of M ≥ 3 competing species：-△[（di＋∑j=1^Mβijuj）ui]=（ai-bi）ui-kui∑j≠iui,i=1,…,M,we prove the uniqueness of the limiting configuration as k →∞ under suitable conditions. Moreover, we prove that the limiting configuration minimizes a variational problem associated to the strongly coupled system among the segregated states with the same boundary conditions.

关键词： Strongly coupled elliptic system uniqueness spatial segregation

Gilbert’s syndrome coexisting with hereditary spherocytosis might not be rare: Six case reports

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2020年第10期8卷 2001-2008页

作者： ling-ling Kang Ze-Lin liu Hou-De Zhang Department of Gastroenterology Nanshan HospitalGuangdong Medical UniversityShenzhen 518052Guangdong ProvinceChina Department of Hematology Nanshan HospitalGuangdong Medical UniversityShenzhen 518052Guangdong ProvinceChina Guangdong Breath Test Engineering and Technology Research Center Shenzhen 518052Guangdong ProvinceChina

BACKGROUND Both Gilbert's syndrome(GS)and hereditary spherocytosis(HS)are common genetic ***,comorbidity of GS with HS has always been considered a rare phenomenon,and it can impede accurate diagnoses in the presence of isolated unconjugated *** SUMMARY In a study on Levitt’s carbon monoxide(CO)breath test for the differential diagnosis of isolated hyperbilirubinemia,we found six GS patients with HS in 6 *** patients,including five males and one female,aged 25-58 years,were from four families and generally in good *** chronic fluctuating jaundice and/or hyperbilirubinemia had been diagnosed as simple constitutional jaundice for 6-30 *** function tests showed isolated unconjugated hyperbilirubinemia with serum total bilirubin ranging from 20.7-75.4μmol/*** hemoglobin was normal in five cases,and slightly decreased in one(11.5 g/dL).Overt hemolytic signs were absent,while erythrocyte lifespan determined by the newly developed Levitt’s CO breath test was significantly short(15-50 d),definitely demonstrating the presence of *** that their unconjugated hyperbilirubinemia compared inappropriately with hemolytic severity,as indicated by the hemoglobin level,further combined genetic tests for both UGT1A1 and hereditary erythrocyte deficiencies were *** tests confirmed,at last,the coexistence of GS with *** Comorbidity of GS and HS might not be uncommon in isolated unconjugated *** CO breath test would sensitively detect the hemolysis,the discordance between the hyperbilirubinemia and hemoglobin level could strongly indicate the coexistence of GS and HS.

关键词： Gilbert’s syndrome Hereditary spherocytosis Unconjugated hyperbilirubinemia Erythrocyte lifespan Levitt’s CO breath test Case report

Plant Regeneration by Callus-Mediated Protocorm-Like Body Induction of Anthurium andraeanum Hort.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2009年第5期8卷 572-577页

作者： YU Yi-xun liu ling liu Juan-xu WANG Jing College of Horticulture South China Agricultural University Guangzhou 510642 P.R.China

This research aims at developing a plant regeneration system from leaf and petiole explants of Anthurium andraeanum Hort., thereby establish a foundation for mass production and transformation. Using tissue culture technique, the conditions for callus induction, protocorm-like body （PLB） formation and plant regeneration from leaf explants and petiole of A. andraeanum, such as basal medium and plant growth regulator, were investigated. Totipotent callus was induced on a 1/2-strength MS medium containing 0.90 μmol L^-1 2,4-dichlorophenoxyacetic acid （2,4-D） and 8.88μmol L^-1 N6-benzyladenine （BA）. The callus exhibited complete hormone autonomy for growth and differentiation of PLBs. This callus proliferated well and was maintained by subculturing on 1/2 MS medium containing 0.90 μmol L^-1 2,4-D and 4.44 μmol L^-1 BA. On average, 8 protocorm-like bodies could be obtained from a piece of 4 mm callus after being transferred to the 1/2 MS medium with 4.44 μmol L^-1 BA after 8 wk of culture. The regenerated PLBs formed shoots and roots on 1/2 MS medium. After 24 wk of culture on these medium, well-developed plantlets for potting were produced. An efficient micropropagation method was established for indirect PLB formation and plant regeneration from leaf and petiole ofA. andraeanum.

关键词： Anthurium andraeanum callus induction plant regeneration protocorm-like body

Synthesis, Structure and Antibacterial Activities of 4-BBTS Schiff Base and Its Complexes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2007年第2期26卷 224-228页

作者： LI Pei-Fan liu Bin WANG Jin-ling Pharmacy Department of Tianjin Medical College Tianjin 300222 China College of Chemistry and Life Tianjin Normal University Tianjin 300074 China

4-Bromobenzaldehyde thiosemicarbazone Schiff base （4-BBTS） and its Cu（Ⅱ）, Zn（Ⅱ）, Co（Ⅱ） and Ni（Ⅱ） complexes were synthesized and characterized by elemental analysis, UV, IR, MS, ^1H NMR, and molar conductivity. Using disc diffusion method, the antibacterial activity tests were conducted. The results revealed that the ligand as well as all the complexes exhibits good antibacterial activities against E. Coli. and S. Aureus. Moreover, Cu（Ⅱ） complex shows the best antibacterial activity, which provides beneficial reference for studying the relationship between the structures and performances.

关键词： 4-BBTS Schiff base synthesis structure antibacterial activity

RAISE:A Resilient Anonymous Information Sharing Environment

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2023年第12期137卷 2743-2759页

作者： Ning Hu ling liu Xin liu Kaijun Wu Yue Zhao Cyberspace Institute of Advanced Technology Guangzhou UniversityGuangzhou510006China Science and Technology on Communication Security Laboratory The 30th Research Institute of China Electronics Technology Group CorporationChengdu610041China College of Computer Engineering and Applied Math Changsha UniversityChangsha410022China

With the widespread application of cloud computing and network virtualization technologies,more and more enterprise applications are directly deployed in the ***,the traditional TCP/IP network transmission model does not fully consider the information security issues caused by the uncontrollable internet *** security communication solutions represented by encrypted virtual private networks(VPN)are facing multiple security *** fact,during the communication process,the user application needs to protect not only the content of the communication but also the behavior of the communication,such as the communication relationship,the communication protocol,and so *** by blockchain and software-defined networking technology,this paper proposes a resilient anonymous information sharing environment,*** RAISE system consists of user agents,a core switching network and a control cluster based on a consortium *** agents are responsible for segmenting,encrypting,and encapsulating user *** core switching network forwards user traffic according to the rules issued by the controller,and the controller dynamically calculates the forwarding rules according to the security *** from onion routing technology,RAISE adopts the controller to replace the onion routing model,which effectively overcomes the uncontrollability of *** dispersed computing model is introduced to replace the TCP/IP pipeline transmission models,which overcomes the problems of anti-tracking and traffic hijacking that cannot be solved by *** propose a blockchain control plane framework,design the desired consensus algorithmand deploy a RAISE systemconsisting of 150 nodes in an internet *** experimental results show that the use of blockchain technology can effectively improve the reliability and security of the control *** maintaining high-performance network transmission,it further provides network communicatio

关键词： Software-defined anonymous communication network blockchain network communication security

Study on the performance of the micropile-mechanically stabilized earth wall

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2018年第4期15卷 825-844页

作者： ZHANG Zhi-chao Ronald Y.S.pak CHEN Yu-min liu Han-long Key Laboratory of Geohazard Prevention of Hilly Mountains Ministry of Land and Resources of China Department of Civil Environmental & Architectural Engineering University of Colorado College of Civil & Transportation Engineering Hohai University Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University

The Micropile-Mechanically Stabilized Earth(MSE) wall, specially designed for mountain roads, is proposed to improve the MSE wall local stability, global stability and impact resistance of roadside barriers. Model tests and the corresponding numerical modeling were conducted to validate the serviceability of the Micropile-MSE wall and the reliability of the numerical method. Then, a parametric study of the stress and deformation of Micropile-MSE wall based on the backfill strength and interfacial friction angle between backfill and backslope is conducted to evaluate its *** test results indicate that the surcharge-induced horizontal earth pressure, base pressure and lateral displacement of the wall panel of Micropile-MSE wall decrease. The corresponding numerical results are nearly equal to the measured values. The basic failure mode of MSE wall in steep terrain is the sliding of backfill along the backslope, while A-frame style micropiles are capable of preventing the sliding *** maximum resultant displacement can be decreased by 6.25% to 46.9% based on different interfacial friction angles, and the displacement canbe reduced by 6% ~ 56.1% based on different backfill strengths. Furthermore, the reduction increases when the interfacial friction angle and internal friction angle of backfill decrease. In addition, the lateral displacement of wall panel, the deformation of backfill decrease and the tension strain of geogrid obviously, which guarantees the MSE wall functions and provides good conditions for mountain roads.

关键词： Mechanically stabilized earth wall Model test Micropile Numerical simulation Stress and deformation behavior

Sol-gel Synthesis and Electrochemical Performance of Li4-xMgxTi5-xZrxO12 Anode Material for Lithium-ion Batteries

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2013年第6期31卷 819-825页

作者： Caixia Qiu Zhongzhi Yuan ling liu Sijie Cheng Jincheng liu School of Chemistry and Environment South China Normal University Guangzhou Guangdong 510006 China EVE Energy Co. Ltd Huizhou Guangdong 516006 China

The anode materials Li4-xMgxTi5-xZrxO12（x=0, 0.05, 0.1） were successfully synthesized by sol-gel method using Ti（OCaH9）4, CH3COOLi·2H2O, MgCl2·6H2O and Zr（NO3）3·6H2O as raw materials. The crystalline structure, morphology and electrochemical properties of the as-prepared materials were characterized by XRD, SEM, cyclic voltammograms （CV）, electrochemical impedance spectroscopy （EIS） and charge-discharge cycling tests. The re- sults show that the lattice parameters of the Mg-Zr doped samples are slightly larger than that of the pure LiaTi5Oi2, and Mg-Zr doping does not change the basic Li4Ti5O2 structure. The rate capability of Li4-xMgxTi5-xZrxO12 （x= 0.05, 0.1） electrodes is significantly improved due to the expansile Li＋ diffusion channel and reduced charge transfer resistance. In this study, Li3.95Mg0.05Ti4.95Zr0.05O12 represented a relatively good rate capability and cycling stability, after 400 cycles at 10 C, the discharge capacity retained as 134.74 mAh·g-1 with capacity retention close to 100%. The excellent rate capability and good cycling performance make Li3.95Mg0.05Ti4.95Zr0.05O12 a promising anode material in lithium-ion batteries.

关键词： Li4Ti5O12 Mg-Zr doping rate performance lithium-ion battery

Prediction of the concentration of chlorophyll-α for liuhai urban lakes in Beijing City

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2006年第4期18卷 827-831页

作者： ZENG Yong YANG Zhi-feng liu Jing-ling State Key Laboratory of Water Environment Simulation School of-Environmental Beijing Normal University Beijing 100875 China Key Laboratory for Water and Sediment Sciences of Ministry of Education School of Environment Beijing Normal University Beijing 100875 China

The weekly water quality monitor data of liuhai lakes between April 2003 and November 2004 in Beijing City were used as an example to build an artificial neural networks （ANN） model and a multi-varieties regression model respectively for predicting the fresh water algae bloom. The different predicted abilities of the two methods in liuhai lakes were compared. A principle analysis method was first used to select the input variables of the models to avoid the phenomenon of collinearity in the data. The results showed that the input variables for the artificial neural networks were T, TP, transparency（SD）, DO, chlorophyll-a （Chl-a）,pH and the output variable was Chl-a. A three layer Levenberg-Marguardt feed forward leaming algorithm in ANN was used to model the eutrophication process of liuhai lakes. 20 nodes in hidden layer and 1 node of output for the ANN model had been optimized by trial and error method. A sensitivity analysis of the input variables was performed to evaluate their relative significance in determining the predicted values. The correlation coefficient between predicted value and observed value in all data and in test data were 0.717 and 0.816 respectively in the artificial neural networks. The stepwise regression method was used to simulate the linear relation between Chl-a and temperature, of which the correlation coefficient was 0.213. By comparing the results of the two models, it was found that neural network models were able to simulate non-linear behavior in the water eutrophication process of liuhai lakes reasonably and could successfully estimate some extreme values from calibration and test data sets.

关键词： artificial neural networks eutrophication multi-varieties regression forecast liuhai lakes Beijing City