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Linear spectral unmixing algorithm for modelling suspendedsediment concentration of ash oods, upper Tekeze River, Ethiopia 预览
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作者 Hagos GGebreslassie Assefa MMelesse +1 位作者 Kevin Bishop Azage GGebremariam 《国际泥沙研究:英文版》 SCIE 2020年第1期79-90,共12页
Flash floods are the highest sediment transporting agent,but are inaccessible for in-situ sampling and have rarely been analyzed by remote sensing technology.Laboratory and field experiments were done to develop linea... Flash floods are the highest sediment transporting agent,but are inaccessible for in-situ sampling and have rarely been analyzed by remote sensing technology.Laboratory and field experiments were done to develop linear spectral unmixing(LSU)remote sensing model and evaluate its performance in simulating the suspended sediment concentration(SSC)in flash floods.The models were developed from continuous monitoring in the laboratory and the onsite spectral signature of river bed sediment deposits and flash floods in the Tekeze River and in its tributary,the Tsirare River.The Pearson correlation coefficient was used to determine the variability of correlations between reflectance and SSCs.The coefficient of determination(R2)and root mean square of error(RMSE)were used to evaluate the performance of the generated models.The results found that the Pearson correlation coefficient between SSCs and reflectance varied based on the level of the SSCs,geological colors,and grain sizes.The performance of the LSU model and empirical remote sensing approaches were computed to be R2?0.92,and RMSE-±0.76 g/l in the Tsirare River and R2-0.91,and RMSE-±0.73 g/l in the Tekeze River and R2?0.81,RMSE-±2.65 g/l in the Tsirare river and R2?0.76,RMSE-±10.87 g/l in the Tekeze River,respectively.Hence,the LSU approach of remote sensing was found to be relatively accurate in monitoring and modeling the variability of SSCs that could be applied to the upper Tekeze River basin. 展开更多
关键词 Empirical remote sensing Flash floods Linear spectral unmixing Suspended sediment concentration Tekeze River
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Detection of QTL(quantitative trait loci)associated with wood density by evaluating genetic structure and linkage disequilibrium of teak 预览
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作者 Vivek Vaishnav Shamim Akhtar Ansari 《林业研究:英文版》 CAS CSCD 2019年第6期2247-2258,共12页
To find the quantitative trait loci associated with wood density in teak(Tectona grandis L.f.), 21 co-dominant markers including 13 site specific recombinase and 8 EST-based co-dominant markers designed from lignin bi... To find the quantitative trait loci associated with wood density in teak(Tectona grandis L.f.), 21 co-dominant markers including 13 site specific recombinase and 8 EST-based co-dominant markers designed from lignin biosynthesis genes were applied to 174 teak plus tree clones at the National Germplasm Bank, Chandrapur,India. The germplasm bank exhibited 10.6% coefficient of variation for wood densities with 84.5 ± 31.3 genetic polymorphism(%). The highly panmictic set of genotypes(FST= 0.035 ± 0.004) harbored 96.47 ± 0.40 genetic variability(%). The average allelic frequency of the 21 codominant markers was 0.65 ± 0.11 with 12.9% pairs of loci in significant LD(p\0.05, R~2 values [ 0.1), confirming their suitability for a strong marker-trait association study. The marker CCoAMT-1 was significantly(p\0.01) associated with wood density showing stability by both GLM and MLM models and explained 4.3% of the phenotypic effect. The marker from the EST representing CCoAMT can be further developed for gene-assisted selection of elite genotypes of teak with greater wood density. Therefore, we believe that the report will help accelerate the genetic improvement and advance the breeding program of the species. 展开更多
关键词 Association mapping Expressed sequence tags(EST) General LINEAR model(GLM) Linkage disequilibrium(LD) Lignin Mixed LINEAR model(MLM) Principal co-ordinate analysis(PCoA)
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A Linear Quadratic Controller Design Incorporating a Parametric Sensitivity Constraint
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作者 Mohamed Yagoubi 《国际自动化与计算杂志:英文版》 EI CSCD 2019年第4期553-562,共10页
The purpose of this paper is to propose a synthesis method of parametric sensitivity constrained linear quadratic (SCLQ) controller for an uncertain linear time invariant (LTI) system. System sensitivity to parameter ... The purpose of this paper is to propose a synthesis method of parametric sensitivity constrained linear quadratic (SCLQ) controller for an uncertain linear time invariant (LTI) system. System sensitivity to parameter variation is handled through an additional quadratic trajectory parametric sensitivity term in the standard LQ criterion to be minimized. The main purpose here is to find a suboptimal linear quadratic control taking explicitly into account the parametric uncertainties. The paper main contribution is threefold: 1) A descriptor system approach is used to show that the underlying singular linear-quadratic optimal control problem leads to a non-standard Riccati equation. 2) A solution to the proposed control problem is then given based on a connection to the so-called Lur'e matrix equations. 3) A synthesis method of multiple parametric SCLQ controllers is proposed to cover the whole parametric uncertainty while degrading as less as possible the intrinsic robustness properties of each local linear quadratic controller. Some examples are presented in order to illustrate the effectiveness of the approach. 展开更多
关键词 LINEAR QUADRATIC control PARAMETRIC uncertainties trajectory sensitivity non-standard RICCATI equation Lur'e matrix equations LINEAR time invariant (LMI) particle SWARM optimization
Non-affine parameter dependent LPV model and LMI based adaptive control for turbofan engines
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作者 Bei YANG Xi WANG Penghui SUN 《中国航空学报:英文版》 SCIE EI CAS CSCD 2019年第3期585-594,共10页
The precise control of turbofan engines thrust is an important guarantee for an aircraft to obtain good flight performance and a challenge due to complex nonlinear dynamics of engines and time-varying parameters. The ... The precise control of turbofan engines thrust is an important guarantee for an aircraft to obtain good flight performance and a challenge due to complex nonlinear dynamics of engines and time-varying parameters. The main difficulties lie in the following two aspects. Firstly, it is hard to obtain an accurate kinetic model for the turbofan engine. Secondly, some model parameters often change in different flight conditions and states and even fluctuate sharply in some cases. These variable parameters bring huge challenge for the turbofan engine control. To solve the turbofan engine control problem, this paper presents a non-affine parameter-dependent Linear Parameter Varying(LPV) model-based adaptive control approach. In this approach, polynomial-based LPV modeling method is firstly employed to obtain the basis matrices, and then the Radial Basis Function Neural Networks(RBFNN) is introduced for the online estimation of the non-affine model parameters to improve the simulation performance. LPV model-based Linear Matrix Inequality(LMI) control method is applied to derive the control law. A robust control term is introduced to fix the estimation error of the nonlinear time-varying model parameters for better control performance. Finally, the Lyapunov stability analysis is performed to ensure the asymptotical convergence of the closed loop system. The simulation results show that the states of the engine can change smoothly and the thrust of the engine can accurately follow the desired trajectory, indicating that the proposed control approach is effective. The contribution of this work lies in the combination of linear system control and nonlinear system control methods to design an effective controller for the turbofan engine and to provide a new way for turbofan engine control research. 展开更多
关键词 Adaptive control LINEAR matrix INEQUALITIES LINEAR PARAMETER varying Neural networks TURBOFAN engines
Application of Optimization Principle in Landmark University Project Selection under Multi-Period Capital Rationing Using Linear and Integer Programming 预览
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作者 Nathaniel Kayode Oladejo 《最优化(英文)》 2019年第3期73-82,共10页
The current structure of Landmark University (LU) was induced by raising a generation of solution providers through a qualitative and life-applicable training system that focuses on values and creative knowledge by ma... The current structure of Landmark University (LU) was induced by raising a generation of solution providers through a qualitative and life-applicable training system that focuses on values and creative knowledge by making it more responsive and relevant to the modern-day demands of demonstration, industrialization and development. The challenge facing Landmark University is the question of which of its numerous projects they should invest to give maximum output with minimum input. In this paper, we maximize the Net Present Value (NPV) and maintain the net discount cash overflow of each project per period as contained and extracted as the secondary data of cash inflows of the Landmark University (LU) monthly financial statement and annual reports from 2012 to 2017 of which the documents have been regrouped as small and large scale projects as many enterprises make more use of the trial-and-error method and as such firms have been finding it difficult in allocating scarce resources in a manner that will ensure profit maximization and/or cost minimization with a simple and accurate decision making by the company through an optimization principle in selecting LU project under multi-period capital rationing using linear programming (LP) and integer programming (IP). The annual net cash flow which is the difference between the cash inflows and cash outflows during each period for the project was estimated and recorded. The discount factors were estimated at cost of capital of 10% for each cash flow per period with the corresponding NPV at 10% which revealed that the optimal decision achieves maximum returns of $110 × 102 and this assisted the project manager to select a large number of the variable projects that can maximize the profit which is far better than relying on an ad-hoc judgmental approach to project investment that could have cost 160 × 102 for the same project. Sensitivity analysis on the project parameters are also carried out to test the extent to which project selection is sensitive to changes in the 展开更多
关键词 OPTIMIZATION LINEAR INTEGER Programming Sensitivity Investment Maximize Net Present Value
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(S,T)-WEAK TRACTABILITY OF MULTIVARIATE LINEAR PROBLEMS IN THE AVERAGE CASE SETTING 预览
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作者 刘永平 许贵桥 《数学物理学报:B辑英文版》 SCIE CSCD 2019年第4期1033-1052,共20页
The purpose of this article is to investigate (s, t)-weak tractability of multivariate linear problems in the average case set ting. The considered algorithms use finitely many evaluations of arbitrary linear function... The purpose of this article is to investigate (s, t)-weak tractability of multivariate linear problems in the average case set ting. The considered algorithms use finitely many evaluations of arbitrary linear functionals. Generally, we obtained matching necessary and sufficient conditions for (s,t)-weak tractability in terms of the corresponding non-increasing sequence of eigenvalues. Specifically, we discussed (s, t)-weak tractability of linear tensor product problems and obtained necessary and sufficient conditions in terms of the corresponding one-dimensional problem. As an example of applications, we discussed also (s,t)-weak tractability of a multivariate approximation problem. 展开更多
关键词 (s t)-weak TRACTABILITY LINEAR PROBLEM LINEAR TENSOR product PROBLEM Hilbert space AVERAGE case setting
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DERIVATIVE SAMPLING EXPANSIONS FOR THE LINEAR CANONICAL TRANSFORM:CONVERGENCE AND ERROR ANALYSIS
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作者 Mahmoud H.Annaby Rashad M.Asharabi 《计算数学:英文版》 SCIE CSCD 2019年第3期403-418,共16页
In recent decades,the fractional Fourier transform as well as the linear canonical transform became very efficient tools in a variety of approximation and signal processing applications.There are many literatures on s... In recent decades,the fractional Fourier transform as well as the linear canonical transform became very efficient tools in a variety of approximation and signal processing applications.There are many literatures on sampling expansions of interpolation type for bandlimited functions in the sense of these transforms.However,rigorous studies on convergence or error analysis are rare.It is our aim in this paper to establish sampling expansions of interpolation type for bandlimited functions and to investigate their convergence and error analysis.In particular,we introduce rigorous error estimates for the truncation error and both amplitude and jitter-time errors. 展开更多
关键词 Linear CANONICAL transform Sampling THEOREMS TRUNCATION ERROR Amplitude ERROR Jitter-time ERROR
Resonant multiple wave solutions to some integrable soliton equations
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作者 刘建根 杨小军 冯忆颖 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第11期92-98,共7页
To transform the exponential traveling wave solutions to bilinear differential equations, a sufficient and necessary condition is proposed. Motivated by the condition, we extend the results to the(2+1)-dimensional Kad... To transform the exponential traveling wave solutions to bilinear differential equations, a sufficient and necessary condition is proposed. Motivated by the condition, we extend the results to the(2+1)-dimensional Kadomtsev–Petviashvili(KP) equation, the(3+1)-dimensional generalized Kadomtsev–Petviashvili(g-KP) equation, and the B-type Kadomtsev–Petviashvili(BKP) equation. Aa a result, we obtain some new resonant multiple wave solutions through the parameterization for wave numbers and frequencies via some linear combinations of exponential traveling waves. Finally, these new resonant type solutions can be displayed in graphs to illustrate the resonant behaviors of multiple wave solutions. 展开更多
关键词 linear SUPERPOSITION principle RESONANT MULTIPLE wave solutions (2+1)-dimensional Kadomtsev–Petviashvili(KP) equation (3+1)-dimensional g-KP and BKP equations
Development cost prediction of general aviation aircraft projects with parametric modeling
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作者 Xiaonan CHEN Jun HUANG Mingxu YI 《中国航空学报:英文版》 SCIE EI CAS CSCD 2019年第6期1465-1471,共7页
The study of the development cost of general aviation aircraft is limited by small samples with many cost-driven factors. This paper investigates a parametric modeling method for prediction of the development cost of ... The study of the development cost of general aviation aircraft is limited by small samples with many cost-driven factors. This paper investigates a parametric modeling method for prediction of the development cost of general aviation aircraft. The proposed technique depends on some principal components, acquired by utilizing P value analysis and gray correlation analysis. According to these principal components, the corresponding linear regression and BP neural network models are established respectively. The feasibility and accuracy of the P value analysis are verified by comparing results of model fitting and prediction. A sensitivity analysis related to model precision and suitability is discussed in detail. Results obtained in this study show that the proposed method not only has a certain degree of versatility, but also provides a preliminary prediction of the development cost of general aviation aircraft. 展开更多
关键词 BP neural network DEVELOPMENT cost General AVIATION AIRCRAFT GRAY correlation ANALYSIS Linear regression P value ANALYSIS PARAMETRIC modeling Preliminary prediction Sensitivity ANALYSIS
Single Image Super-Resolution via Dynamic Lightweight Database with Local-Feature Based Interpolation
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作者 Na Ding Ye-Peng Liu +1 位作者 Lin-Wei Fan Cai-Ming Zhang 《计算机科学技术学报:英文版》 SCIE EI CSCD 2019年第3期537-549,共13页
Single image super-resolution is devoted to generating a high-resolution image from a low-resolution one,which has been a research hotspot for its significant applications. A novel method that is totally based on the ... Single image super-resolution is devoted to generating a high-resolution image from a low-resolution one,which has been a research hotspot for its significant applications. A novel method that is totally based on the single input image itself is proposed in this paper. Firstly, a local-feature based interpolation method where both edge pixel property and location information are taken into consideration is presented to obtain a better initialization. Then, a dynamic lightweight database of self-examples is built with the aid of our in-depth study on self-similarity, from which adaptive linear regressions are learned to directly map the low-resolution patch into its high-resolution version. Furthermore, a gradually upscaling strategy accompanied by iterative optimization is employed to enhance the consistency at each step.Even without any external information, extensive experimental comparisons with state-of-the-art methods on standard benchmarks demonstrate the competitive performance of the proposed scheme in both visual effect and objective evaluation. 展开更多
关键词 lightweight DATABASE linear regression local-feature INTERPOLATION SUPER-RESOLUTION
An integrated optimization and simulation approach for air pollution control under uncertainty in open-pit metal mine
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作者 Zunaira Asif Zhi Chen 《环境科学与工程前沿(英文)》 SCIE EI CAS CSCD 2019年第5期101-114,共14页
Open-pit metal mines contribute toward air pollution and without effective control techniques manifests the risk of violation of environmental guidelines. This paper establishes a stochastic approach to conceptualize ... Open-pit metal mines contribute toward air pollution and without effective control techniques manifests the risk of violation of environmental guidelines. This paper establishes a stochastic approach to conceptualize the air pollution control model to attain a sustainable solution. The model is formulated for decision makers to select the least costly treatment method using linear programming with a defined objective function and multi-constraints. Furthermore, an integrated fuzzy based risk assessment approach is applied to examine uncertainties and evaluate an ambient air quality systematically. The applicability of the optimized model is explored through an open-pit metal mine case study, in North America. This method also incorporates the meteorological data as input to accommodate the local conditions. The uncertainties in the inputs, and predicted concentration are accomplished by probabilistic analysis using Monte Carlo simulation method. The output results are obtained to select the cost-effective pollution control technologies for PM2.5, PM10, NOx, SO2 and greenhouse gases. The risk level is divided into three types (loose, medium and strict) using a triangular fuzzy membership approach based on different environmental guidelines. Fuzzy logic is then used to identify environmental risk through stochastic simulated cumulative distribution functions of pollutant concentration. Thus, an integrated modeling approach can be used as a decision tool for decision makers to select the cost-effective technology to control air pollution. 展开更多
关键词 Air pollution Decision analysis Linear programming MINING OPTIMIZATION FUZZY Monte Carlo
The 4Rs in radiation therapy
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作者 Luo Wei 《中华放射医学与防护杂志》 CAS CSCD 北大核心 2019年第8期572-580,共9页
It has been realized that the 4Rs(repair,repopulation,redistribution,and reoxygenation)would affect the result of cell irradiation,and thus radiation treatment.The 4Rs each occurs at different dose rates,usually very ... It has been realized that the 4Rs(repair,repopulation,redistribution,and reoxygenation)would affect the result of cell irradiation,and thus radiation treatment.The 4Rs each occurs at different dose rates,usually very low dose rates.Depending on the dose rate used for treatment,the corresponding R should be included in the linear-quadratic equation(LQ)and biological effective dose(BED)calculation.For low dose rate brachytherapy(LDR)especially permanent implant,all the 4Rs should be included in LQ for BED calculation.The 4Rs,especially repair and repopulation,play a critical role in dose fractionation.Various dose fractionation schemes such as hyperfractionation and hypofractionation are determined in consideration of the 4Rs.Stereotactic radiation therapy uses hypofractionation with high fractional doses and combine with high accuracy target localization techniques to achieve high local control rates compared to conventional dose fractionation schemes.The 4Rs have been taken into account for LDR and permanent implant.Recently,LQ for permanent implant brachytherapy has been modified to include all the 4Rs for gynecological malignancy 131 Cs permanent implants.Including the 4Rs in radiation therapy has significantly improved the effectiveness and efficiency of radiation therapy for cancer treatment. 展开更多
关键词 REPAIR REPOPULATION REDISTRIBUTION REOXYGENATION Linear QUADRATIC EQUATION
An Improved Dynamic Friction Rejection Attitude Stability Control Strategy 预览
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作者 Yonghai Wang Gang Meng +2 位作者 Jianlin Li Yongtao Shui Baogang Lu 《哈尔滨工业大学学报:英文版》 EI CAS 2019年第5期79-87,共9页
The attitude stability control of under actuated spacecraft that used two reaction wheels in the presence of dynamic friction disturbance is handled. A novel improved control approach with a combination of a singular ... The attitude stability control of under actuated spacecraft that used two reaction wheels in the presence of dynamic friction disturbance is handled. A novel improved control approach with a combination of a singular control law based on quaternion and extended state observer (ESO) is employed to establish a stabilization control so as to restrain the effect of friction. The corresponding simulation results demonstrate the highly stable accuracy and performance compensated dynamic friction. Furthermore if there is a non zero initial condition in under actuated axis the attitude stability can be enhanced with a magnetic torquer. Simulations for a nano spacecraft denote a potential application value in pointing accuracy using two reaction wheels and a magnetic torquer. 展开更多
关键词 nanospacecraft dynamic FRICTION SINGULAR control linear EXTENDED state OBSERVER magnetic torquer
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大跨度连续梁悬臂灌筑施工线形监控技术研究 预览
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作者 刘强 《高速铁路技术》 2019年第4期38-43,共6页
蒙华铁路跨京广铁路特大桥中大跨度预应力混凝土连续梁采用单箱单室、变高度、变截面直腹板,施工工序和施工阶段较多。为确保梁体能够按设计及规范要求顺利合龙,文章利用有限元正装分析法进行模拟计算,计算出在各种外界因素影响下的梁... 蒙华铁路跨京广铁路特大桥中大跨度预应力混凝土连续梁采用单箱单室、变高度、变截面直腹板,施工工序和施工阶段较多。为确保梁体能够按设计及规范要求顺利合龙,文章利用有限元正装分析法进行模拟计算,计算出在各种外界因素影响下的梁体预拱度设置,然后通过实测数据与理论数据进行比较分析,对计算模型进行修正。通过施工线形监控、及时发现、及时调整,解决合龙前悬臂端竖向挠度的偏差,使得主梁轴线的横向位移不超过容许值,确保合龙后的梁体线形良好。 展开更多
关键词 合龙 监控 竖向挠度 位移 线形
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POSITIVE MAPS CONSTRUCTED FROM PERMUTATION PAIRS 预览
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作者 侯晋川 赵海利 《数学物理学报:B辑英文版》 SCIE CSCD 2019年第1期148-164,共17页
A property(C) for permutation pairs is introduced. It is shown that if a pair{π1, π2} of permutations of(1,2,…,n) has property(C),then the D-type map Φπ1,π2 on n× n complex matrices constructed from {π1,π... A property(C) for permutation pairs is introduced. It is shown that if a pair{π1, π2} of permutations of(1,2,…,n) has property(C),then the D-type map Φπ1,π2 on n× n complex matrices constructed from {π1,π2} is positive. A necessary and sufficient condition is obtained for a pair {π1,π2} to have property(C),and an easily checked necessary and sufficient condition for the pairs of the form {πp,πq} to have property(C) is given, whereπ is the permutation defined by π(i) = i + 1 mod n and 1≤ p < q≤ n. 展开更多
关键词 matrix ALGEBRAS positive linear MAPS PERMUTATIONS quantum information
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Universal bound on sampling bosons in linear optics and its computational implications
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作者 Man-Hong Yung Xun Gao Joonsuk Huh 《国家科学评论:英文版》 CSCD 2019年第4期719-729,共11页
In linear optics, photons are scattered in a network through passive optical elements including beam splitters and phase shifters, leading to many intriguing applications in physics, such as Mach–Zehnder interferomet... In linear optics, photons are scattered in a network through passive optical elements including beam splitters and phase shifters, leading to many intriguing applications in physics, such as Mach–Zehnder interferometry, the Hong–Ou–Mandel effect, and tests of fundamental quantum mechanics. Here we present the fundamental limit in the transition amplitudes of bosons, applicable to all physical linear optical networks. Apart from boson sampling, this transition bound results in many other interesting applications,including behaviors of Bose–Einstein condensates(BEC) in optical networks, counterparts of Hong–Ou–Mandel effects for multiple photons, and approximating permanents of matrices. In addition,this general bound implies the existence of a polynomial-time randomized algorithm for estimating the transition amplitudes of bosons, which represents a solution to an open problem raised by Aaronson and Hance(Quantum Inf Comput 2012; 14: 541–59). Consequently, this bound implies that computational decision problems encoded in linear optics, prepared and detected in the Fock basis, can be solved efficiently by classical computers within additive errors. Furthermore, our result also leads to a classical sampling algorithm that can be applied to calculate the many-body wave functions and the S-matrix of bosonic particles. 展开更多
关键词 BOSON sampling QUANTUM OPTICS QUANTUM SUPREMACY linear OPTICS COMPUTATIONAL complexity
基于线性非线性回归分析的防空导弹费用建模 预览 被引量:1
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作者 赵曰强 安实 +2 位作者 麦强 于道林 张耀东 《现代防御技术》 2019年第2期101-108,共8页
选取整个寿命费用周期中最稳定、最有代表性的防空导弹生产费用进行建模研究。分析了最大射程、制导精度、导弹质量等技术特性对防空导弹费用的影响,引入制导精度这个重要因素,提高了线性模型对新型防空导弹武器系统的适应性。对导弹的... 选取整个寿命费用周期中最稳定、最有代表性的防空导弹生产费用进行建模研究。分析了最大射程、制导精度、导弹质量等技术特性对防空导弹费用的影响,引入制导精度这个重要因素,提高了线性模型对新型防空导弹武器系统的适应性。对导弹的生产费用分别建立了线性模型和非线性模型,并分析各种模型的特点,对它们的精度和适用性进行了对比。 展开更多
关键词 防空导弹 线性 非线性 多元回归 费用 模型
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斜拉桥索塔施工质量控制技术 预览
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作者 税宁波 王红力 《四川水力发电》 2019年第5期58-60,共3页
斜拉桥适用于大跨度桥梁,广泛应用于大江大河以及峡谷间。但由于其施工条件复杂,操作空间受限,建造难度较大,因而对斜拉桥索塔施工技术质量的把控就显得至关重要。以建设中的某斜拉桥项目为例,针对该工程斜拉桥索塔施工质量控制的要点... 斜拉桥适用于大跨度桥梁,广泛应用于大江大河以及峡谷间。但由于其施工条件复杂,操作空间受限,建造难度较大,因而对斜拉桥索塔施工技术质量的把控就显得至关重要。以建设中的某斜拉桥项目为例,针对该工程斜拉桥索塔施工质量控制的要点制定的施工辅助措施进行了简明地概述及分析。 展开更多
关键词 斜拉桥 索塔 混凝土 施工辅助措施 线形
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Lagrangian duality and saddle points for sparse linear programming
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作者 Chen Zhao Ziyan Luo +2 位作者 Weiyue Li Houduo Qi Naihua Xiu 《中国科学:数学英文版》 SCIE CSCD 2019年第10期2015-2032,共18页
The sparse linear programming(SLP) is a linear programming problem equipped with a sparsity constraint, which is nonconvex, discontinuous and generally NP-hard due to the combinatorial property involved.In this paper,... The sparse linear programming(SLP) is a linear programming problem equipped with a sparsity constraint, which is nonconvex, discontinuous and generally NP-hard due to the combinatorial property involved.In this paper, by rewriting the sparsity constraint into a disjunctive form, we present an explicit formula of the Lagrangian dual problem for the SLP, in terms of an unconstrained piecewise-linear convex programming problem which admits a strong duality under bi-dual sparsity consistency. Furthermore, we show a saddle point theorem based on the strong duality and analyze two classes of stationary points for the saddle point problem. At last,we extend these results to SLP with the lower bound zero replaced by a certain negative constant. 展开更多
关键词 SPARSE linear programming LAGRANGIAN dual problem strong DUALITY SADDLE point THEOREM OPTIMALITY condition
Linear random search and engineering estimation of sinkage for launching carrier aircraft
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作者 ZHONG Guo HUANG Jun +1 位作者 ZHOU ZeYang YI MingXu 《中国科学:技术科学英文版》 SCIE EI CAS CSCD 2019年第6期996-1002,共7页
A linear random search algorithm(LRSA) is developed to determine the critical value of takeoff weight limited to the safe flight track sinkage and an engineering estimation method(EEM) is proposed to calculate the sin... A linear random search algorithm(LRSA) is developed to determine the critical value of takeoff weight limited to the safe flight track sinkage and an engineering estimation method(EEM) is proposed to calculate the sinkage of carrier aircraft launch in real time. Based on the analysis of free flight after leaving the carrier, the equations are established to participate into engineering estimation of flight track sinkage. Thanks to the proposed search algorithm, the maximum takeoff weight of carrier aircraft with safe catapult launch flight track sinkage is generated in few steps. The results of sinkage estimation and the search algorithm are in good agreement with that of aircraft catapult launch simulation. The main contribution of this manuscript is the establishment of simple and accurate engineering estimation for carrier aircraft launch flight track sinkage and the development of robust and efficient search algorithm for the critical value with safe catapult criteria. 展开更多
关键词 carrier aircraft LAUNCH flight track SINKAGE ENGINEERING ESTIMATION LINEAR random search simulation
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