检索结果-南通市图书馆

Improving the Covertness in the Physical-Layer Authentication

在线全文

学校读者我要写书评

暂无评论

China Communications 2021年第3期18卷 122-131页

作者： ning xie TianXing Hu College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China Guangdong Key Laboratory of Intelligent Information Processing and Shenzhen Key Laboratory of Media Security(Shenzhen University) Shenzhen 518060China

A well-designed Physical-Layer Authentication(PLA)scheme should consider three properties:covertness,robustness,and ***,the three properties always cause some dilemmas,e.g.,higher covertness leading to lower *** paper concerns the problem of improving the covertness without sacrificing the *** problem is important because of the following reasons:reducing the errors in recovered source message,improving the security,and ease of constructing a multi-factor authentication *** this paper,we propose three covert PLA schemes to address the *** the first scheme,we improve the covertness by reducing the modification ratio on the source message based on an encoding *** the second scheme,we improve the covertness by optimizing the superimposing angle,which maximizes the minimum distance between the tagged symbols and the boundary line of the demodulation decision for the source *** the third scheme,referred to as the hybrid scheme,we further improve the covertness by jointly using the advantages of both the above two *** experimental results show that when the SNR at a legitimate receiver is 25 dB,as compared with the prior scheme,the first scheme improves the covertness by 17:74%,the second scheme improves the covertness by 28:79%,and the third scheme improves the covertness by 32:09%,while they have similar robustness as Received:Aug.07,2020 Revised:Sep.08,2020 Editor:Nanrun Zhou that of the prior scheme.

关键词： physical-layer authentication encoding covertness superimposing angle security

Imprints of ultralight axions on the gravitational wave and pulsar timing measurement

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 23-29页

作者： ning xie Fa Peng Huang MOE Key Laboratory of TianQin Mission TianQin Research Center for Gravitational Physics&School of Physics and AstronomyFrontiers Science Center for TianQinGravitational Wave Research Center of CNSASun Yat-sen University(Zhuhai Campus)Zhuhai 519082China

The axion or axion-like particle motivated from a natural solution of strong CP problem or string theory is a promising dark matter *** study the new observational effects of ultralight axion-like particles by the space-borne gravitational wave detector and the radio *** the neutron star-black hole binary as an example,we demonstrate that the gravitational waveform could be obviously modified by the slow depletion of the axion cloud around the black hole formed through the superradiance *** compare these new effects on the binary with the well-studied effects from dynamical friction with dark matter and dipole radiation in model-independent ***,we discuss the constraints from LIGO/Virgo and study the detectability of the ultralight axion particles at LISA and TianQin.

关键词： gravitational wave axion dark matter

同方期刊数据库

Interference effects of two and three super-tall buildings under wind action

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2011年第5期27卷 687-696页

作者： Ming Gu Zhuang-ning xie State Key Lab for Disaster Reduction in Civil Engineering Tongji University 200092 Shanghai China Department of Civil Engineering South China University of Technology 510641 Guangzhou China

Most previous investigations on interference effects of tall buildings under wind actions focused on the wind induced interference effects between two buildings,and the interference effects of three or more buildings have seldom been studied so far due to the huge workload involved in experiments and data *** this paper,mean and dynamic force/response interference effects and peak wind pressure interference effects of two and three tall buildings,especially the three-building configuration,are investigated through a series of wind tunnel tests on typical tall building models using high frequency force balance technique and wind pressure ***,the present paper focuses on the effects of parameters,including breadth ratio and height ratio of the buildings and terrain category,on the interference factors and derives relevant regression results for the interference factors.

关键词： Super-tall building · Wind force and response · Interference effect · Wind tunnel test

The mechanism of actions of Octreotide, Bupleurum-Peony Cheng Qi decoction and Salvia Miltiorrhiza in severe acute pancreatitis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 1999年第3期5卷 249-251页

作者： WU xie-ning 上海市第一人民医院上海

The pathogenesis of severe acute pancreatitis (necrotizing pancreatitis) is complicated and has not been elucidated up to date. In my opinion, it is multifactorial, and aggressive treatment should be directed to the mutifaceted pathophysiology［1］. A cumulative series of twenty cases were treated with the regimen i.e., combined traditional Chinese and modern medicine. No death, almost no morbidity and no serious complications, such as ARDS and DIC occurred, only mental confusion as sequela occurred in a patient with previous cerebral infarction. The present article is to discuss the mechanism of actions of the medicines used in this treatment regimen.

关键词： Bupleurum-Peony Cheng Qi decoction and Salvia Miltiorrhiza in severe acute pancreatitis

MINIMAX INVARIANT ESTIMATOR OF CONTINUOUS DISTRIBUTION FUNCTION UNDER LINEX LOSS

维普期刊数据库评论

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 Systems Science & Complexity 2007年第1期20卷 119-126页

作者： Jianhui ning Minyu xie Department of Statistics Central China Normal University Wuhan 430079 China.

In this paper we consider the problem of estimation of a continuous distribution function under the LINEX loss function. The best invariant estimator is obtained and proved to be minimax for any sample size n ≥ 1.

关键词： Invariant estimator LINEX loss function non-parametric estimation.

Analysis of temperature,stress,and displacement distributions of staves for a blast furnace

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2009年第5期16卷 512-516页

作者： Xiao-jun ning Shu-sen Cheng ning-qiang xie School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The temperature of gas flow inside a blast furnace （BF） changes significantly when the blast furnace is under unstable operations, and the temperature and stress distributions of cooling staves （CS） for BF work the same pattern. The effect of gas temperature on the temperature, stress, and displacement distributions of the cooling stave were analyzed as the gas temperature inside the blast furnace rose from 1000 to 1600℃ in 900 s. The results show that both the temperature and temperature gradient of the hot side of CS increase when the gas flow temperature inside BF rises. The temperature gradient of the hot side of CS is greater than that of the other area of CS and it can reach 65℃/mm. In the vertical direction of the hot side of CS, closer to the central part of CS, the stress intensity is greater than that of the other area of the hot side of CS, which causes cracks on the hot side of CS in the vertical di- rection. As the gas temperature increases, the stress intensity rate near the fixed pin increases and finally reaches 45 MPa/s. Fatigues near the fixed pin and bolts are caused by great stress intensity rate and the area around the pin can be damaged easily. The edge of CS bends toward the cold side and the central part of CS shifts toward the hot surface.

关键词： blast furnace cool stave gas temperature numerical simulation

Current concept of Spleen Stomach theory and Spleen deficiency syndrome in TCM

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 1998年第1期4卷 7-11页

作者： WU xie ning Shanghai First Peoples Hosp Dept Gastroenterol Shanghai 200080 Peoples R China Shanghai First Peoples Hosp Cent Res Lab Shanghai 200080 Peoples R China

ＣｕｒｅｎｔｃｏｎｃｅｐｔｏｆＳｐｌｅｅｎＳｔｏｍａｃｈｔｈｅｏｒｙａｎｄＳｐｌｅｅｎｄｅｆｉｃｉｅｎｃｙｓｙｎｄｒｏｍｅｉｎＴＣＭＷＵＸｉｅＮｉｎｇＳｕｂｊｅｃｔｈｅａｄｉｎｇｓｓｐｌｅｅｎｄｅｆｉｃｉｅｎｃｙ... 详细信息

ＣｕｒｅｎｔｃｏｎｃｅｐｔｏｆＳｐｌｅｅｎＳｔｏｍａｃｈｔｈｅｏｒｙａｎｄＳｐｌｅｅｎｄｅｆｉｃｉｅｎｃｙｓｙｎｄｒｏｍｅｉｎＴＣＭＷＵＸｉｅＮｉｎｇＳｕｂｊｅｃｔｈｅａｄｉｎｇｓｓｐｌｅｅｎｄｅｆｉｃｉｅｎｃｙｓｙｎｄｒｏｍｅ；ｓｐｌｅｅｎｓ...

关键词： spleen deficiency syndrome spleen stomach theory

Unique Solvability for a Class of Non-newtonian Fluids for a Reacting Mixture with Vacuum

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2016年第4期32卷 833-850页

作者： Hong-jun YUAN Jia-ning xie College of Mathematics Jilin University School of Mathematics and Quantitative Economics Dongbei University of Finance and Economics

In this paper,we consider a class of non-Newtonian fluids for a reacting mixture in one-dimensional bounded interval, provided the initial data satisfying a compatibility condition. The main ingredient is that we allo... 详细信息

关键词： existence and uniqueness reactive gas flow vacuum non-Newtonian

Analysis of Effect of Gas Temperature on Cooling Stave of Blast Furnace

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2010年第1期17卷 1-6页

作者： xie ning-qiang CHENG Shu-sen School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

In order to study the effect of gas temperature variation on cooling stave, temperature, stress and displacement distributions of cooling stave were analyzed respectively when gas temperature inside- blast furnace increases from 1000 to 1 600 ℃. The results show that the temperature field on cold side is under control of cooling pipes and hardly changes when gas temperature increases. The temperature gradient and change rate with time near hot sides are greater than those in other regions and the later can reach 100 ℃/s. The stress intensity near middle area of hot surface is up to 400 MPa and that＇s why there are lots of cracks at this place. The edge of stave is bent to cold side and middle regions between fixed bolts and pin moves to hot side. The displacement around fixed pin is smaller but larger on the edge and the maximum is located on hot side of top surface. The maximum displacement in z direction is about 4 mm and 3 mm in y direction. If the expansion coefficient of packing layer is 1/4, the thickness of packing layer between the cooling staves is 32 mm and 24 mm between sides up and down.

关键词： temperature variation displacement temperature change rate stress intensity packing layer