检索结果-南通市图书馆

Mobile crowd sensing task optimal allocation： a mobility pattern matching perspective

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2018年第2期12卷 231-244页

作者： Liang WANG Zhiwen YU Bin GUO fei YI fei xiong School of Computer Science Northwestern Polytechnical University Xi'an 710072 China School of Electrical and Control Engineering Xi'an University of Science and Technology Xi'an 710054 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China

With the proliferation of sensor-equipped portable mobile devices, Mobile CrowdSensing （MCS） using smart devices provides unprecedented opportunities for collecting enormous surrounding data. In MCS applications, a crucial issue is how to recruit appropriate participants from a pool of available users to accomplish released tasks, satisfying both resource efficiency and sensing quality. In order to meet these two optimization goals simultaneously, in this paper, we present a novel MCS task allocation framework by aligning existing task sequence with users＇ moving regularity as much as possible. Based on the process of mobility repetitive pattern discovery, the original task allocation problem is converted into a pattern matching issue, and the involved optimization goals are transformed into pattern matching length and support degree indicators. To determine a trade-off between these two competitive metrics, we propose greedy- based optimal assignment scheme search approaches, namely MLP, MDP, IU1 and IU2 algorithm, with respect to matching length-preferred, support degree-preferred and integrated utility, respectively. Comprehensive experiments on real- world open data set and synthetic data set clearly validate the effectiveness of our proposed framework on MCS task optimal allocation.

关键词： mobile crowd sensing task allocation mobility regularity pattern matching

Investigation into Improvement for Anti-Rollover Propensity of SUV

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2017年第3期30卷 698-710页

作者： fei xiong Fengchong Lan Jiqing Chen Yuedong Yang School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510640China Guangzhou Automobile Group Co.Ltd Automotive Engineer Institute Guangzhou 511434China

Currently, many research from domestic and foreign on improving anti-rollover performance of vehicle mainly focus on the electronic control of auxiliary equip- ment, do not make full use of suspension layout to optimize anti-rollover performance of vehicle. This investigation into anti-rollover propensity improvement concentrates on the vehicle parameters greatly influencing on anti-rollover propensity of vehicle. A simulation based on fishhook procedure is used to perform design trials and evaluations aimed at ensuring an optimal balance between vehicle＇s design parameters and various engineering capacities, the anti-rollover propensity is optimized at the detailed design stage of a new SUV model. Firstly a four-DOF theoretical kinematic model is established, then a complete multi-body dynamics model built in ADAMS/car based on the whole vehicle parameters is correlated to the objective handing and stability test results of a mule car. Secondly, in fish- hook test simulations, the Design of Experiments method is used to quantify the effect of the vehicle parameters on the anti-rollover performance. By means of the simulation, the roll center height of front suspension should be more than 30 mm, that of rear suspension less than 150 mm, and the HCG less than 620 mm for the SUV. The ratio of front to rear suspension roll stiffness should be ranged from 1.4 to1.6 for the SUV. As a result, at the detailed design stage of product, the anti-rollover performance of vehicle can be improved by optimizing chassis and integrated vehicle parameters.

关键词： Fishhook test Tire normal force Roll center Roll stiffness

Cautiously using natural medicine to treat liver problems

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第19期23卷 3388-3395页

作者： fei xiong Yong-Song Guan Department of Oncology West China Hospital of Sichuan University

Natural medicine is a system of therapy that administrates natural agents and their derivatives to treat human *** medicine has been used to treat many kinds of human diseases for thousands of *** treatment protocols of natural medicine are integrative in nature,and are required to utilize the most appropriate therapies to address the needs of the individual *** of the relative convenience,safety and efficacy,natural medicine is now increasing *** doctors are licensed in many areas of the world and regulated partly by law in these areas,which is quite different from various other forms of complementary and alternative *** diseases,such as hepatitis,liver cirrhosis and liver carcinoma,are serious health problems *** half of the natural agents used in treatment of liver diseases today are natural products and their *** natural medicine is beneficial and safe,physicians should pay close attention to the potential side-effects of the naturopathic agents,which lead to liver injury,interstitial pneumonia and acute respiratory ***,when administrating naturopathic protocols to patients for the treatment of liver diseases,we should try our best to prevent and avoid as much as possible the negative impact of these *** article highlights the current practice and recommended improvement of natural medicines in the treatment of liver diseases and gives some specific examples to emphasize the prevention and management of adverse reactions of the natural agents and suggests that natural medicine should be cautiously used to treat liver problems.

关键词： Caution Natural medicine Herb Natural nutraceutical Liver disease Adverse reactions

Layered space time codes and capacity analysis in correlated fading channels with distributed antenna system

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 2011年第1期18卷 28-35页

作者： xiong fei ZHANG Jian-hua ZHANG Ping Wireless Technology Innovation Institute Key Laboratory of Universal Wireless Communication Ministry of Education 13eijing University of Posts and Telecommunications Beijing 100876 China

In this paper we have investigated the performance of downlink generalized distributed antenna system （GDAS）. Under the assumption of spatial correlated fading conditions, we have derived the numeric expression of correlated coefficients according to series of Bessel function, and have lifted the range restriction of the mean angle of incident. Moreover, the architecture of distributed generalized layered space time codes （GLST） has been considered in order to achieve both multiplexing gain and diversity gain while we have used basis vector from null space instead of orthogonal set to obtain the same system performance but with lower complexity. Furthermore, in order to maximize the capacity, Gerschgorin circles based fast antenna selection algorithms have been evaluated including a discussion of those simulation results.

关键词： GDAS GLST capacity correlated fading channel

Application of the Blister Test in Study of Epoxy Adhesive

在线全文

学校读者我要写书评

暂无评论

材料科学与工程学报 2000年第Z2期20卷 804-810页

作者： fei xiong Industrial Research Institute Swinburne (IRIS) Hawthorn Melbourne Australia Gintic Institute of Manufacturing Technology Singapore 63875

Shaft-loaded blister test technique is used as an effective quantitative tool to measure adhesion strength. Investigation on conductive adhesive was done by modified blister test. It is found that shaftloaded blister test can be a good solution for the debonding of thin film adhesion. The intrinsic stable interface debonding process has been proved an attractive alternative to the conventional adhesion measurement techniques. In our study, epoxy matrix adhesive was studied using blister test technique in comparison with the traditional test-lap shear test. Adhesion strength was studied as a function of surface treatment and the metallization of substrate. It was found that surface conditions of substrate have significant impact on adhesion behaviour. The oxidation of surface is responsible for the poor adhesion. Activating chemical treatment and Plasma cleaning on substrate surface has been found to be a way of dreamatically improving adhesion strength of electronic conductive adhesive.

关键词： blister test delamination debonding pre-creack adhesion

Generating Kerr nonlinearity with an engineered non-Markovian environment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第4期29卷 146-153页

作者： fei-Lei xiong Wan-Li Yang Mang Feng State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China Department of Physics Zhejiang Normal UniversityJinhua 321004China School of Physics and Engineering Zhengzhou UniversityZhengzhou 450001China

Kerr nonlinearity is an important resource for creating squeezing and entanglement in quantum *** we propose a scheme for generating Kerr nonlinearity originated from an engineered non-Markovian environment,which is different from the previous efforts using nonlinear media or quantum systems with special energy *** the present work,the generation of Kerr nonlinearity depends on the system-environment interaction time,the energy spectrum of the environment,and the system-environment coupling strength,regardless of the environmental initial *** scheme can be realized in systems originally containing no Kerr interaction,such as superconducting circuit systems,optomechanical systems,and cavity arrays connected by transmission lines.

关键词： Kerr nonlinearity quantum non-Markovianity engineered environment

New approaches in agent-based modeling ofcomplex financial systems

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2017年第6期12卷 115-126页

作者： Ting-Ting Chen Bo Zheng Yan Li xiong-fei Jiang Department of Physics Zhejiang University Hangzhou 310027 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

Agent-based modeling is a powerful simulation technique to understand the collective behavior and microscopic interaction in complex financial systems. Recently, the concept for determining the key parameters of agent-based models from empirical data instead of setting them artificially was sug- gested. We first review several agent-based models and the new approaches to determine the key model parameters from historical market data. Based on tile agents＇ behaviors with heterogeneous personal preferences and interactions, these models are successful in explaining the microscopic origi- nation of the temporal and spatial correlations of financial markets. We then present a novel paradigm combining big-data analysis with agent-based modeling. Specifically, from internet query and stock market data, we extract the information driving forces and develop an agent-based model to simulate the dynamic behaviors of complex financial systems.

关键词： econophysics complex systems

Characteristics and genesis of tuffaceous shale oil lithofacies:A case study of Lucaogou Formation in Santanghu Basin

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Research 2024年第1期9卷 37-47页

作者： Dongsheng Xiao xiong fei Xu Jilun Kang Yiting Zhang PetroChina Tuha Oilfield Company Exploration and Development Research Institute China

Lucaogou Formation in the Santanghu Basin is a special lacustrine fine-grained sedimentary deposits rich in volcanic debris and carbonate,with abundant shale oil ***,understanding of shale oil characteristics and genesis remains ***,sedimentary environment,and formation mechanisms of tuffaceous shale oil are investigated based on core and thin section observations,X-ray diffraction,field emission SEM and geochemical *** show that three mixed lithofacies types are developed in Lucaogou Formation:blocky tuff,laminated tuffaceous dolomite,and laminated dolomitic *** lithofacies types are characterized by high content of felsic and dolostone,widespread organic matter,and low clay *** of tuffaceous shale oil sweet spots is primarily influenced by four factors:inputting of volcanic ash as a high-quality source rocks and reservoirs provides good material basis;devitrification of volcanic glass,calcitization,and dissolution are crucial for formation of reservoirs;expulsion of source rocks with high-abundance organic matter expulsion facilitates migration and accumulation of hydrocarbon in adjacent reservoirs;fracture development improves reservoir permeability to form highly productive sweet *** analyzing characteristics and genesis of tuffaceous shale oil,the main controlling factors of reservoir physical property and oil saturation are clarified,which is of great significance for selection of shale oil exploration zones.

关键词： shale oil Tuffaceous Formation mechanism Lucaogou formation Santanghu basin

ENERGY DISSIPATION AND CALCULATION OF RESISTANCE AND VELOCITY OF DEBRIS FLOW

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

泥沙研究 1997年第1期 71-78页

作者： fei Xiangjun 1 and xiong Gang 2

ＥＮＥＲＧＹＤＩＳＳＩＰＡＴＩＯＮＡＮＤＣＡＬＣＵＬＡＴＩＯＮＯＦＲＥＳＩＳＴＡＮＣＥＡＮＤＶＥＬＯＣＩＴＹＯＦＤＥＢＲＩＳＦＬＯＷＦＥＩＸｉａｎｇｊｕｎ１ａｎｄＸＩＯＮＧＧａｎｇ２ＡＢＳＴＲＡＣＴＢｅｃａｕｓｅｏｆ... 详细信息

ＥＮＥＲＧＹＤＩＳＳＩＰＡＴＩＯＮＡＮＤＣＡＬＣＵＬＡＴＩＯＮＯＦＲＥＳＩＳＴＡＮＣＥＡＮＤＶＥＬＯＣＩＴＹＯＦＤＥＢＲＩＳＦＬＯＷＦＥＩＸｉａｎｇｊｕｎ１ａｎｄＸＩＯＮＧＧａｎｇ２ＡＢＳＴＲＡＣＴＢｅｃａｕｓｅｏｆｔｈｅｈｉｇｈｃｏｎｃｅｎｔｒａｔ...

关键词： Debris flow Energy dissipation Resistance Velocity