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Fast method for spreading sequence estimation of DSSS signal based on maximum likelihood function

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Journal of Systems Engineering and Electronics 2010年第6期21卷 948-953页

作者： Yanhua peng Bin tang Ming Lv College of Electronic Engineering University of Electronic Science and Technology of China Chengdu 610054 E R. China

To estimate the spreading sequence of the direct sequence spread spectrum (DSSS) signal, a fast algorithm based on maximum likelihood function is proposed, and the theoretical derivation of the algorithm is provided. By simplifying the objective function of maximum likelihood estimation, the algorithm can realize sequence synchronization and sequence estimation via adaptive iteration and sliding window. Since it avoids the correlation matrix computation, the algorithm significantly reduces the storage requirement and the computation complexity. Simulations show that it is a fast convergent algorithm, and can perform well in low signal to noise ratio (SNR).

关键词： direct sequence spread spectrum (DSSS) signal spreading sequence maximum likelihood estimation (MLE).

Supply of condominiums in central district of Okayama City and Kyoto City

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Frontiers of Architectural Research 2012年第2期1卷 178-185页

作者： peng tang Key Laboratory of Urban and Architectural Heritage Conservation School of ArchitectureSoutheast UniversityNanjin210096China

Most of the local cities of Japan are suffering from the depopulation in central district （C.D.）. In Okayama city, the government had induced some strategies such as supply more condominiums for local revitalization since 2000. From the Basic Resident Register of Okayama, the population in C.D. Okayama has increased recentlyo This study has the goal to clarify the situation of condominium supply in this district by an investigation. Compared with the result of a same survey in C.D. Kyoto, the foUowing findings are confirmed： population recovery is happening in the central district in both of the 2 cities. The dimension of the condominiums in Okayama is Larger than that in Kyoto. The average dimension of the condominiums in Okayama is 14 stories building with 61 units of 110 m2. Contrasting[y, that in Kyoto is 11 storied building with 59 units of 82 m2. Most of the condominiums in C.D. Kyoto are located closely to the railway or subway station, while those in C.D. Okayama are randomly located, because of the high dependence of automobile traffic. The previous usages of the sites of condominiums in Okayama are parking, housing and financial institute, and in Kyoto they are parking, shop or business building.

关键词： Condominium Poputation recovery Dimension Location Orisinat rand-use

Synthesis of a novel calix[4]arene-based fluorescent ionophore and its metal ions recognition properties

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Chinese Chemical Letters 2009年第1期20卷 13-16页

作者： Qiang peng Xing Hua tang College of Environmental and Chemical Engineering Nanchang Hangkong University Nanchang 330063 People's Republic of China

A novel fluorescent ionophore derived from calix[4]arene and pyrazoline was designed and *** molecular structure was confirmed by ^1H NMR and element *** resulting material shows specific fluorescent behavior toward the Zn^2＋ion among the other divalent metal ions,such as Co^2＋,Ni^2＋,Cu^2＋.The primary results indicate this ionophore material is a potential material for developing efficient fluorescent Zn^2＋ chemosensors.

关键词： Calixarene Pyrazoline Recognition Metal ions

Application of bamboo in a design-build course: Lianhuadang Farm project

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Frontiers of Architectural Research 2019年第4期8卷 549-563页

作者： Jian Jiao peng tang School of Architecture Southeast UniversityNanjing210096China

The entire process of the Lianhuadang Farm Project,that is,from early-stage investigations to the completed construction,was *** project is a graduate design-build course of the School of Architecture of Southeast *** Town,Yixing,which has a long handicraft tradition in eastern China,is the project *** and craftsmen constructed six viewing facilities and renovated a toilet and a management *** explored ways of using bamboo and traditional craftsmanship by analyzing the main teaching procedures and the key technical issues in the *** also studied contemporary methods to expand the construction in real ***,the significance of bamboo construction for architectural design teaching was examined.

关键词： Bamboo tectonics Design-build course Craftsmanship

Chemokines: the past, the present and the future

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Cellular & Molecular Immunology 2018年第4期15卷 295-298页

作者： peng tang Ji Ming Wang Department of Breast Surgery Southwest HospitalArmy Medical UniversityChongqing 400038China Cancer and Inflammation Program Center for Cancer ResearchNational Cancer Institute at FrederickFrederick 21702MDUSA

We are very excited to publish our article in the“Chemokine Special Issue”of Cellular and Molecular Immunology,which has received increasing attention in the field of immunology.A natural question emerging regarding this issue is,why chemokines?The answer may of course not be simple,but if we consider only the essential,a shortened answer should be because chemokines are among the first mobilizers of host responses in homeostasis and diseases associated with inflammation(Figure 1).

关键词： has Figure among

Assessment of piloting behavior impact on landing risk of transport aircraft

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Chinese Journal of Aeronautics 2024年第9期37卷 178-192页

作者： Zhiyue XIONG Shuguang ZHANG Mingkai WANG peng tang Mengmeng WANG School of Transportation Science and Engineering Beihang UniversityBeijing 102206China

The human factors and their interaction with other factors play an important role in the flight safety of transport *** this paper,a paradigm of risk assessment for transport aircraft interacting with piloting behaviors is proposed,with focus on landing which is the most accident-prone flight stage in aviation safety ***-based flight simulation serves as our data source for landing risk analysis under uncertainties.A digital pilot in the loop that reflects the human piloting behaviors is employed to facilitate simulation *** types of unsafe events in landing are identified from *** this basis,the landing safety boundary is extracted via stochastic simulation to divide safety and hazardous flight status domains,which con-tributes to flight status management and risk *** simulation results indicate that appro-priate piloting behavior,which is active response and fast target acquisition with minimum overshoot and fluctuation,shows benefit to landing *** subset simulation technique is employed to further refine the boundary with less computational ***,the effect of airspeed,windspeed,and other factors on landing risk is also *** proposed risk assess-ment method would help optimize operation procedure and develop targeted pilot training program.

关键词： Landing risk assessment Risk parameterization Human factors Piloting behavior model Landing safety boundary Subset simulation

Feasibility Study on Common Methods for Wave Force Estimation of Deep Water Combined Breakwaters

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Journal of Ocean University of China 2015年第4期14卷 629-635页

作者： YU Dingyong tang peng SONG Qingguo College of Engineering Ocean University of China

China's newly enacted Breakwater Design Specifications(JTS154-2011) explicitly state that breakwaters with water depths greater than 20 m are categorized as deep-water breakwaters, and emphasize that design principles, methods and construction requirements are different from those of common shallow water breakwaters. However, the specifications do not make any mention of how to choose wave force calculation methods of deep-water breakwaters. To study the feasibility of different formulae for wave force estimation of deep water combined breakwaters, the wave force calculated by the Sainflou's, Goda's, modified Goda's and specifications' methods are compared for various water depths and wave heights in this paper. The calculated results are also compared with experimental data. The total horizontal forcing and the pattern of pressure distributions are presented. Comparisons show that the wave pressure distributions by the four methods are similar, but the total horizontal forces are different. The results obtained by the Goda's method and the specified formulae are much closer to the experimental data. As for the wave force estimation for the deepwater mixed embankment foundation bed parapet, the Goda's formula is applied in the case with a water depth of less than 42 m. The Specifications method is suitable for standing waves. In the wave force estimates of breastworks, Sainflou's and the modified Gaoda's formulae are no longer applicable for the foundation bed of mixed embankment.

关键词： combined breakwater breast wave force deep water feasibility

Finite Water Depth Effect on Wave-Body Problems Solved by Rankine Source Method

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Journal of Ocean University of China 2017年第2期16卷 191-199页

作者： FENG Aichun tang peng YOU Yunxiang LIU Kaizhou Department of Civil and Environmental Engineering National University of Singapore College of Ocean Science and Engineering Shanghai Maritime University School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong University State key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of Science

Finite water depth effect for wave-body problems are studied by continuous Rankine source method and non-desingularized *** surface and seabed surface profiles are represented by continuous panels rather than a discretization by isolated *** panels are positioned exactly on the fluid boundary surfaces and therefore no desingularization technique is *** increment method is applied for both free surface source and seabed source arrangements to reduce computational cost and improve numerical *** order Runge-Kutta iteration scheme is adopted on the free surface updating at every time *** finite water depth effect is studied quantitatively for a series of cylinders with different B/T *** accuracy and efficiency of the proposed model are validated by comparison with published numerical results and experimental *** results show that hydrodynamic coefficients vary for cylinder bodies with different ratios of B/*** certain set of B/T ratios the effect of finite water depth increases quickly with the increase of motion frequency and becomes stable when frequency is relatively *** also shows that water depths have larger hydrodynamic effects on cylinder with larger breadth to draft *** the heave added mass and damping coefficients increase across the frequency range with the water depths decrease for forced heave *** water depths have smaller effects on sway motion response than on heave motion response.

关键词： finite water depth Rankine source method continuous source panel Runge-Kutta

Restudy on Dark Matter Time-Evolution in the Littlest Higgs Model with T-Parity

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Communications in Theoretical Physics 2008年第11期50卷 1211-1218页

作者： QIAO Qing-peng tang Jian LI Xue-Qian Department of Physics Nankai University Tianjin 300071 China

Following previous study, in the littlest Higgs model （LHM）, the heavy photon is supposed to be a possiL dark matter candidate and its relic abundance of the heavy photon is estimated in terms of the Boltzman- Lee-Weinba time-evolution equation. The effect of the T-parity violation is also considered. Our calculations show that when Higmass MH taken to be 300 GeV and do not considering T-parity violation, only two narrow ranges 133 〈 MAH 〈 135 Ge and 167 〈 MAH〈 169 GeV are tolerable with the current astrophysical observation and if 135 〈 MAH 〈 167 GeV there must at least exist another species of heavy particle contributing to the cold dark matter. As long as the T-pari; can be violated, the heavy photon can decay into regular standard model particles and would affect the dark matt abundance in the universe, we discuss the constraint on the T-parity violation parameter based on the present dat Direct detection prospects are also discussed in some detail.

关键词： little Higgs dark matter time evolution