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Nonlinear Control of Aircraft on Ground Runway Keeping

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Nonlinear Control of Aircraft on Ground Runway Keeping

2011 International Conference on Fluid Power and Mechatronics

作者： Bihua Chen School of Automation Science and Electrical engineering Beihang university Beijing 100191 China Zongxia Jiao School of Automation Science and Electrical engineering Beihang university Beijing 100191 China Shuzhi Sam Ge department of Electrical &Computer engineering National university of Singapore Singapore 117576

This paper addresses the aircraft on ground runway keeping problem.A nonlinear model of the aircraft on ground is derived which explicitly combines the kinematic constraints and dynamic *** proposed model considers the kinematic constraints of nose wheel cornering and the tyre side-slip effects, as well as the aerodynamic forces and *** focus on the task that the aircraft is required to follow the runway and avoid runway departure by nose wheel *** control is designed to keep the aircraft approach the runway centerline while lateral deviation is *** results clearly demonstrate the advantages and effectiveness of the proposed method.

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Minority identification for imbalanced dataset

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Minority identification for imbalanced dataset

第三十一届中国控制会议

作者： Tong Liu Yongquan Liang Weijian Ni department of information engineering Shandong university of Science and Technology Qingdao 266590

＜正＞Minority identification is an important issue in network security and financial *** paper considers the direct maximum reachability distance of an object and the indirect minimum reachability distance of an object for measuring the degree of an object being *** data classification is performed by an optimized combination *** empirically evaluate the proposed approach using a number of UCI data sets,and experiment results demonstrate that our method outperforms the existing methods in terms of the comparisons of ROC curves.

关键词： classification imbalanced learning feature subsets minority identification

On the Subsidy Mechanisms for Urban Public Traffi

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Journal of Systems Science and Systems engineering 2001年第1期13卷 101-107页

作者： OU Guo li, ZHU Xiao min department of Economics, Northern Jiaotong university, Beijing 100044, China department of Economics Northern Jiaotong University Beijing 100044 China

：There is no doubt that the urban public traffic operations in China suffer losses and hence it isnecessary to study resonable subsidy mechanisms for the urban public traffic. On the basis of analyzing themodes of the urban public traffic management, we classify the financial losses into the policy loss and themanagement loss, according to whether the cost can be compensated or not. In addition, a series of criteriaare introduced in order to efficiently decide the amount of subsidy. Finally, this paper also examines the wayof bidding administration, which is considered to be promising in the future of urban public traffic.

关键词： urban public traffic policy loss management loss

维普期刊数据库

INTEREST RATE RISK PREMIUM AND EQUITY VALUATION

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Journal of Systems Science & Complexity 2010年第3期23卷 484-498页

作者： Srdjan D.STOJANOVIC department of Mathematical Sciences University of Cincinnati

The authors employ the recent stochastic-control-based approach to financial mathematicsto solve a problem of determination of the risk premium for a stochastic interest rate model,andthe corresponding problem of equity *** risk premium is determined explicitly,by meansof solving a corresponding partial differential equation (PDE),in two forms:one,time-dependent,corresponding to a finite time contract expiration,and the simpler version corresponding to *** stocks are perpetual contracts,when solving the problem of equity valuation,the latterform of the risk premium is *** means of solving the general pricing PDE,an efficient equityvaluation method was developed that is a combination of some sophisticated explicit formulas,and anumerical procedure.

关键词： Equity valuation incomplete markets interest rate risk neutral pricing risk premium.

维普期刊数据库

FLUVIAL PROCESSES IN THE LOWER JINGJIANG RIVER:IMPACT OF THE THREE GORGES RESERVOIR IMPOUNDMENT

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International Journal of Sediment Research 2005年第2期20卷 102-108页

作者： Xuejun SHAO1,Hong WANG2 and Zhaoyin WANG 1 31Prof.2Asso.Prof.,department of Hydraulic engineering,Tsinghua university,Beijing 100084,China Send correspondence to Xuejun Shao 3Prof.Dr.International Research and Training Center on Erosion and Sedimentation(IRTCES),Beijing 100044,China department of Hydraulic engineering Tsinghua University Beijing 100084 China department of Hydraulic engineering Tsinghua University Beijing 100084 China International Research and Training Center on Erosion and Sedimentation (IRTCES) Beijing 100044 China

Sediment supply to the lower Jingjiang River will be subject to substantial reduction after the impoundment of the Three Gorges Reservoir,which could result in an excess of carrying capacity and serious bank erosions in the downstream alluvial channel,threatening the bank protection works and the safety of the Jingjiang Dyke. This paper presents a summary of research works concerning the fluvial processes in the lower Jingjiang River and the possible impact of the Three Gorges Reservoir impoundment on the variation of its channel pattern. Three different predictions have been put forward by researchers:1) the Jingjiang River will evolve towards a more sinuous,meandering channel pattern,with extensive bank erosion taking place along the river; 2) the river channel will be straightened and broadened because no point bar can be formed due to reduced sediment supply while bank erosion develops in the concave bank,and 3) this river reach will maintain its present channel pattern without significant change,although the sinuosity may be slightly reduced,since:a) the Three Gorges Reservoir mainly intercept sediment particles with sizes larger than 0.025mm,and b) the complex interaction between the Yangtze River and the Dongting Lake helps to reduce the negative effect of channel erosion through certain self-adjusting mechanism in fluvial processes. Discrepancy between these predictions shows that further research efforts are needed to understand the impact of Three Gorges Reservoir operation on the downstream fluvial processes. Meanwhile,there is an urgent need to closely monitor future development in the fluvial processes of the Jingjiang River and its influence on the safety of the Jingjiang Dykes.

关键词： Three Gorges Reservoir Downstream impact Fluvial processes Yangtze River

Microstructural evolution of Al-20Si-5Fe alloy during rapid solidification and hot consolidation

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Rare Metals 2009年第6期28卷 639-645页

作者： M.Rajabi M.Vahidi A.Simchi P.Davami department of Materials Science and engineering Sharif University of Technology Institute for Nanoscience and Nanotechnology (INST) Sharif University of Technology

Al-20Si-5Fe melt was rapidly solidified into particles and ribbons and then consolidated to near full density by hot pressing at 400℃/250 MPa/1 h. According to the eutectic-growth and dendritic-growth velocity models, the solidification front velocity and the amount of undercooling were estimated for the particles with different sizes. Values of 0.43-1.2 cm/s and 15-28 K were obtained. The secondary dendrite arm spacing revealed a cooling rate of 6 × 10^5 K/s for the particles with an average size of 20 μm. Solidification models for the ribbons yielded a cooling rate of 5 × 10^7 K/s. As a result of the higher cooling rate, the melt-spun ribbons exhibited considerable microstructural refinement and modification. The size of the primary silicon decreased from approximately 1μm to 30 nm while the formation of iron-containing intermetallic compounds was suppressed. Supersaturation of the aluminum matrix in an amount of-7 at.% Si was noticed from the XRD patterns During the hot consolidation process, coarsening of the primary silicon particles and precipitation of β-Al5FeSi phase were observed. Evaluation of the compressive strength and hardness of the alloy indicated an improvement in mechanical properties due to the microstructural modification.

关键词： Al-Si-Fe alloy rapid solidification cooling rate microstructure mechanical properties

维普期刊数据库

Transient simulation of hydropower station with consideration of three-dimensional unsteady flow in turbine

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Transient simulation of hydropower station with consideratio...

The 26th IAHR Symposium on Hydraulic Machinery and Systems

作者： W D Huang H G Fan and N X Chen State key Laboratory of Hydroscience and engineering department of Thermal engineering Tsinghua university Beijing 100084 China

To study the interaction between the transient flow in pipe and the unsteady turbulent flow in turbine,a coupled model of the transient flow in the pipe and threedimensional unsteady flow in the turbine is developed based on the method of characteristics and the fluid governing equation in the accelerated rotational relative *** loadrejection process under the closing of guide vanes of the hydraulic power plant is simulated by the coupled method,the traditional transient simulation method and traditional threedimensional unsteady flow calculation method respectively and the results are *** pressure,unit flux and rotation speed calculated by three methods show a similar change ***,because the elastic water hammer in the pipe and the pressure fluctuation in the turbine have been considered in the coupled method,the increase of pressure at spiral inlet is higher and the pressure fluctuation in turbine is stronger.

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Truncated Ice Nucleation Protein-Based Cell-surface Display of Green Fluorescent Protein in Escherichia coli

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Truncated Ice Nucleation Protein-Based Cell-surface Display ...

首届中国青年学者微生物遗传学学术研讨会

作者： Li Lin Cha Hyung-joon Gang Dong-gyun Yu Ziniu Laboratory of Agricultural Microbiology, School of Life Science and Technology, Huazhong Agricultural university, Wuhan 430070, PR China department of Chemical engineering & Division of Molecular and Life Science, Pohang university of Science and Technology, Pohang 790-784, korea

The truncated ice nucleation protein InaK from Pseudomonas syringae KCTC1832 strain with only N-terminal domain (InaK-N), was newly achived as an anchoring motif to display the noninvasive reporter, green fluorescence... 详细信息

关键词： Ice-nucleating protein cell-surface display anchoring motif green fluorescent protein

Extracting Brain Dynamics by Statistical Spatial Filtering

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Extracting Brain Dynamics by Statistical Spatial Filtering

The 7th China-India-Japan-korea Joint Workshop on Neurobiology and Neuroinformatics 2005

作者： Bo Hong, Xiaorong Gao, Zhiguang Zhang, Shangkai Gao department of Biomedical engineering, Tsinghua university, Beijing 100084, China

Scalp EEG has a superior time resolution among non-invasive brain recording methods, which make it possible to be used not only for real-time applications as brain computer interface (BCI), but also for investigating the transient cognitive brain function. However, the signal recorded by an EEG electrode is difficult to be directly attributed to the underlying cortical activities due to the inhomogeneous conducting structure of the human head. Ton of efforts have been made to develop methods of extracting single-trial brain dynamics from scalp recordings.

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