期刊文献+
共找到505篇文章
< 1 2 26 >
每页显示 20 50 100
PRICING EUROPEAN OPTION IN A DOUBLE EXPONENTIAL JUMP-DIFFUSION MODEL WITH TWO MARKET STRUCTURE RISKS AND ITS COMPARISONS 被引量:13
1
作者 Deng Guohe 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2007年第2期127-137,共11页
Using Fourier inversion transform, P.D.E. and Feynman-Kac formula, the closedform solution for price on European call option is given in a double exponential jump-diffusion model with two different market structure ri... Using Fourier inversion transform, P.D.E. and Feynman-Kac formula, the closedform solution for price on European call option is given in a double exponential jump-diffusion model with two different market structure risks that there exist CIR stochastic volatility of stock return and Vasicek or CIR stochastic interest rate in the market. In the end, the result of the model in the paper is compared with those in other models, including BS model with numerical experiment. These results show that the double exponential jump-diffusion model with CIR-market structure risks is suitable for modelling the real-market changes and very useful. 展开更多
关键词 double exponential distribution jump-diffusion model market structure risk
下载PDF
Critical Exercise Price for American Floating Strike Lookback Option in a Mixed Jump-Diffusion Model 被引量:4
2
作者 YANG Zhao-qiang 《Chinese Quarterly Journal of Mathematics》 2018年第3期240-259,共20页
This paper studies the critical exercise price of American floating strike lookback options under the mixed jump-diffusion model. By using It formula and Wick-It-Skorohod integral, a new market pricing model estab... This paper studies the critical exercise price of American floating strike lookback options under the mixed jump-diffusion model. By using It formula and Wick-It-Skorohod integral, a new market pricing model established under the environment of mixed jumpdiffusion fractional Brownian motion. The fundamental solutions of stochastic parabolic partial differential equations are estimated under the condition of Merton assumptions. The explicit integral representation of early exercise premium and the critical exercise price are also given, then the American floating strike lookback options factorization formula is obtained, the results is generalized the classical Black-Scholes market pricing model. 展开更多
关键词 MIXED jump-diffusion fractional BROWNIAN motion Wick-Ito-Skorohod integral market pricing model option factorization CRITICAL exercise price
下载PDF
New Mathematical Model Based on Affine ransformation for Remote Sensing Image with High Resolution
3
作者 ZHANG Jianqing ZHANG Zuxun 《Geo-Spatial Information Science》 2003年第1期49-53,共5页
This paper calculates the parameters of image position and orientation,proposes a mathematical model and adopts a new method with three steps of transformations based on parallel ray projection.Every step of the model... This paper calculates the parameters of image position and orientation,proposes a mathematical model and adopts a new method with three steps of transformations based on parallel ray projection.Every step of the model is strict,and the map function of each transformation is the first order polynomials and other simple function.The final calculation of the parameters is for the linear equations with good status.As a result,the problem of the relativity of image parameter calculation is solved completely.Some experiments are carried out. 展开更多
关键词 remote sensing image high resolution parameter calculation affine transformation mathematical model
下载PDF
A revised jump-diffusion and rotation-diffusion model
4
作者 Hua Li Yu-Hang Chen Bin-Ze Tang 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第5期216-221,共6页
Quasi-elastic neutron scattering(QENS) has many applications that are directly related to the development of highperformance functional materials and biological macromolecules, especially those containing some water. ... Quasi-elastic neutron scattering(QENS) has many applications that are directly related to the development of highperformance functional materials and biological macromolecules, especially those containing some water. The analysis method of QENS spectra data is important to obtain parameters that can explain the structure of materials and the dynamics of water. In this paper, we present a revised jump-diffusion and rotation-diffusion model(rJRM) used for QENS spectra data analysis. By the rJRM, the QENS spectra from a pure magnesium-silicate-hydrate(MSH) sample are fitted well for the Q range from 0.3 ^(-1) to 1.9 ^(-1) and temperatures from 210 K up to 280 K. The fitted parameters can be divided into two kinds. The first kind describes the structure of the MSH sample, including the ratio of immobile water(or bound water) C and the confining radius of mobile water a_0. The second kind describes the dynamics of confined water in pores contained in the MSH sample, including the translational diffusion coefficient Dt, the average translational residence timeτ0, the rotational diffusion coefficient D_r, and the mean squared displacement(MSD) u^2. The r JRM is a new practical method suitable to fit QENS spectra from porous materials, where hydrogen atoms appear in both solid and liquid phases. 展开更多
关键词 revised jump-diffusion and rotation-diffusion model (rJRM) data analysis of quasi-elastic neutron scattering (QENS) spectra dynamics of water magnesium-silicate-hydrate (MSH) samples
下载PDF
Multiple Model Soft Sensor Based on Affinity Propagation, Gaussian Process and Bayesian Committee Machine 被引量:32
5
作者 李修亮 苏宏业 褚健 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第1期95-99,共5页
Presented is a multiple model soft sensing method based on Affinity Propagation (AP), Gaussian process (GP) and Bayesian committee machine (BCM). AP clustering arithmetic is used to cluster training samples acco... Presented is a multiple model soft sensing method based on Affinity Propagation (AP), Gaussian process (GP) and Bayesian committee machine (BCM). AP clustering arithmetic is used to cluster training samples according to their operating points. Then, the sub-models are estimated by Gaussian Process Regression (GPR). Finally, in order to get a global probabilistic prediction, Bayesian committee mactnne is used to combine the outputs of the sub-estimators. The proposed method has been applied to predict the light naphtha end point in hydrocracker fractionators. Practical applications indicate that it is useful for the online prediction of quality monitoring in chemical processes. 展开更多
关键词 multiple model soft sensor affinity propagation Gaussian process Bayesian committee machine
下载PDF
基于Affine强度的一般Poisson损失动态模型 被引量:2
6
作者 韩丹 张效成 《天津理工大学学报》 2007年第6期75-78,共4页
首先介绍了GPL动态模型,然后引入Affine过程的概念,讨论随机强度是Affine过程时的GPL模型,并进一步讨论了如何求出随机过程的损失密度,从而得出CDO债券的价格.
关键词 GPL动态模型 POISSON过程 affine过程 affine强度 损失密度
下载PDF
3D Model Retrieval Method Based on Affinity Propagation Clustering 被引量:2
7
作者 Lin Lin Xiao-Long Xie Fang-Yu Chen 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2013年第3期12-21,共10页
In order to improve the accuracy and efficiency of 3D model retrieval,the method based on affinity propagation clustering algorithm is proposed. Firstly,projection ray-based method is proposed to improve the feature e... In order to improve the accuracy and efficiency of 3D model retrieval,the method based on affinity propagation clustering algorithm is proposed. Firstly,projection ray-based method is proposed to improve the feature extraction efficiency of 3D models. Based on the relationship between model and its projection,the intersection in 3D space is transformed into intersection in 2D space,which reduces the number of intersection and improves the efficiency of the extraction algorithm. In feature extraction,multi-layer spheres method is analyzed. The two-layer spheres method makes the feature vector more accurate and improves retrieval precision. Secondly,Semi-supervised Affinity Propagation ( S-AP) clustering is utilized because it can be applied to different cluster structures. The S-AP algorithm is adopted to find the center models and then the center model collection is built. During retrieval process,the collection is utilized to classify the query model into corresponding model base and then the most similar model is retrieved in the model base. Finally,75 sample models from Princeton library are selected to do the experiment and then 36 models are used for retrieval test. The results validate that the proposed method outperforms the original method and the retrieval precision and recall ratios are improved effectively. 展开更多
关键词 feature extraction project ray-based method affinity propagation clustering 3D model retrieval
下载PDF
High-frequency acoustic backscattering characteristics for acoustic detection of the red tide species Akashiwo sanguinea and Alexandrium affine 被引量:1
8
作者 KIM Hansoo KANG Donhyug +1 位作者 JUNG Seung Won KIM Mira 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2019年第4期1268-1276,共9页
Harmful algal blooms (HABs), caused by the overgrowth of certain phytoplankton species, have negative effects on marine environments and coastal fisheries. In addition to cell-counting methods using phytoplankton nets... Harmful algal blooms (HABs), caused by the overgrowth of certain phytoplankton species, have negative effects on marine environments and coastal fisheries. In addition to cell-counting methods using phytoplankton nets, a hydroacoustic technique based on acoustic backscattering has been proposed for the detection of phytoplankton blooms. However, little is known of the acoustic properties of HAB species. In this study, as essential data to support this technique, we measured the acoustic properties of two HAB species, Akashiwo sanguinea and Alexandrium affine, which occur in the South Sea off the coast of Korea. Due to the small size of the target, we used ultrasound for the measurements. Experiments were conducted under laboratory and field conditions. In the laboratory experiment, the acoustic signal received from each species was directly proportional to the cell abundance. We derived a relationship between the cell abundance and acoustic signal received for each species. The measured signals were compared to predictions of a fluid sphere scattering model. When A. sanguinea blooms appeared at an abundance greater than 3 500 cells/mL, the acoustic signals varied with cell abundance, showing a good correlation. These results confirm that acoustic measurements can be used to detect HAB species. 展开更多
关键词 acoustic backscattering Akashiwo sanguinea ALEXANDRIUM affine fluid-sphere scattering model harmful ALGAL BLOOMS (HABs) red TIDE
下载PDF
基于affine类时频分析的旋回性薄互层时频特征影响因素分析 被引量:1
9
作者 聂伟东 李雪英 +2 位作者 万乔升 王福霖 何谞超 《物探与化探》 CAS 北大核心 2020年第4期763-769,共7页
affine类时频分析方法具有模糊瞬时频谱变化细节,突出主要频率变化趋势的特点,具有较好的旋回判别能力,因而被学者用于旋回性薄互层类型判别当中,研究发现,旋回性薄互层时域波形均有向薄层方向波形密集,厚层方向波形稀疏的特点,但其稳... affine类时频分析方法具有模糊瞬时频谱变化细节,突出主要频率变化趋势的特点,具有较好的旋回判别能力,因而被学者用于旋回性薄互层类型判别当中,研究发现,旋回性薄互层时域波形均有向薄层方向波形密集,厚层方向波形稀疏的特点,但其稳定性差,易受外界干扰影响。由仿射类时频分布得到的时频谱与沉积旋回模式具有一一对应关系,不同模式旋回薄互层均有向层厚减薄方向的升频特点,目前关于旋回性薄互层时频特征影响因素的研究很少,厘清这些因素对旋回判断准则的影响有重要的意义。基于以上考虑,本文以正旋回模型为基础,从小层厚度突变、波阻抗大小、噪声影响、地震资料主频大小、地层黏性吸收作用等5个方面对旋回判别的影响进行了探讨。首先根据波动理论,利用深度域相移法对不同影响因素条件的旋回性薄互层进行正演模拟,分别抽取零偏移距道集进行仿射类时频分析,对比理想情况的旋回性薄互层时频特征差异。结果表明:仿射类时频分布判别沉积旋回抗噪能力强,受薄互层中小层厚度轻微突变的影响小;波阻抗的变化主要影响时频谱时间方向能量分布,对频率方向能量分布影响甚微;地震资料主频变化对时频特征的影响较小,随着地震资料主频的增加,旋回的趋势更加明显;地层黏性吸收作用对该方法判别的准确度影响也较小,时频特征稳定。 展开更多
关键词 仿射类时频分析 薄互层 旋回性 正演模拟 黏性吸收
下载PDF
Dual-stage Optimal Iterative Learning Control for Nonlinear Non-affine Discrete-time Systems 被引量:20
10
作者 CHI Rong-Hu HOU Zhong-Sheng 《自动化学报》 EI CSCD 北大核心 2007年第10期1061-1065,共5页
根据沿着重复轴的一种新动态 linearization 技术,双阶段的最佳的反复的学习控制为非线性、非仿射的分离时间的系统被介绍。双阶段显示二个最佳的学习阶段分别地被设计反复地改进控制输入顺序和学习获得。主要特征是控制器设计和集中... 根据沿着重复轴的一种新动态 linearization 技术,双阶段的最佳的反复的学习控制为非线性、非仿射的分离时间的系统被介绍。双阶段显示二个最佳的学习阶段分别地被设计反复地改进控制输入顺序和学习获得。主要特征是控制器设计和集中分析仅仅取决于动态系统的 I/O 数据。换句话说,没有知道系统的任何另外的知识,我们能容易选择控制参数。模拟学习沿着重复轴说明介绍方法的几何集中,在哪个马路的一个例子控制为它的内在的工程重要性是引人注目的交通反复的学习。 展开更多
关键词 非线性系统 离散时间系统 自适应控制 迭代学习控制 匝道交通调节
下载PDF
Forward Affine Point Set Matching Under Variational Bayesian Framework 被引量:1
11
作者 QU Han-Bing CHEN Xi +1 位作者 WANG Song-Tao YU Ming 《自动化学报》 EI CSCD 北大核心 2015年第8期1482-1494,共13页
关键词 贝叶斯 点集 匹配 仿射 框架 变分 逼近算法 线性变换
下载PDF
Output Feedback Control of Discrete-Time T-S Fuzzy Affine Systems Using Quantized Measurements
12
作者 Wenqiang Ji Jianbin Qiu 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2018年第3期43-54,共12页
This paper investigates the problem of robust H!fixed-order dynamic output feedback( DOF)controller design for a class of Takagi-Sugeno( T-S) fuzzy affine systems using quantized measurements.Through a state-input aug... This paper investigates the problem of robust H!fixed-order dynamic output feedback( DOF)controller design for a class of Takagi-Sugeno( T-S) fuzzy affine systems using quantized measurements.Through a state-input augmentation method,some sufficient conditions for controller synthesis are developed based upon piecewise quadratic Lyapunov functions( PQLFs) in terms of LMIs. Two illustrative studies are conducted to verify the effectiveness of the proposed controller synthesis approach. 展开更多
关键词 fuzzy affine models ROBUSTNESS dynamic output feedback measurement quantization
下载PDF
Dividend Maximization when Cash Reserves Follow a Jump-diffusion Process
13
作者 LI LI-LI FENG JING-HAI SONG LI-XIN 《Communications in Mathematical Research》 CSCD 2009年第2期143-158,共16页
This paper deals with the dividend optimization problem for an insurance company, whose surplus follows a jump-diffusion process. The objective of the company is to maximize the expected total discounted dividends pai... This paper deals with the dividend optimization problem for an insurance company, whose surplus follows a jump-diffusion process. The objective of the company is to maximize the expected total discounted dividends paid out until the time of ruin. Under concavity assumption on the optimal value function, the paper states some general properties and, in particular, smoothness results on the optimal value function, whose analysis mainly relies on viscosity solutions of the associated Hamilton-Jacobi-Bellman (HJB) equations. Based on these properties, the explicit expression of the optimal value function is obtained. And some numerical calculations are presented as the application of the results. 展开更多
关键词 jump-diffusion model dividend payment Hamilton-Jacobi-Bellmanequation viscosity solution
下载PDF
Solving Major Problems Using Vector Affine Quantization
14
作者 John R. Klauder 《Journal of High Energy Physics, Gravitation and Cosmology》 2022年第1期178-183,共6页
Affine quantization is a parallel procedure to canonical quantization, which is ideally suited to deal with special problems. Vector affine quantization introduces multiple degrees of freedom which find that working t... Affine quantization is a parallel procedure to canonical quantization, which is ideally suited to deal with special problems. Vector affine quantization introduces multiple degrees of freedom which find that working together creates novel tools suitable to eliminate typical difficulties encountered in more conventional approaches. 展开更多
关键词 affine QUANTIZATION Vector Field models Canonical Quantization
下载PDF
Vector Affine Quantization Can Create Valid Quantum Field Theories
15
作者 John R. Klauder 《Journal of High Energy Physics, Gravitation and Cosmology》 2022年第1期237-242,共6页
Affine quantization, a parallel procedure to canonical quantization, needs to use its principal quantum operators, specifically <i>D</i> = (<i>PQ</i>+<i>QP</i>)/2 and <i>Q<... Affine quantization, a parallel procedure to canonical quantization, needs to use its principal quantum operators, specifically <i>D</i> = (<i>PQ</i>+<i>QP</i>)/2 and <i>Q</i> ≠ 0, to represent appropriate kinetic factors, such as <i>P</i><sup>2</sup>, which involves only one canonical quantum operator. The need for this requirement stems from path integral quantizations of selected problems that affine quantization can solve but canonical quantization fails to solve. This task is resolved for simple examples, as well as examples that involve scalar, and vector, quantum field theories. 展开更多
关键词 affine Quantization Vector Field models Flexibility of the Dilation Variable
下载PDF
Adsorption and Step Elution of Urokinase Using Affinity Chromatography-Comparison of Data with Rate Model Simulation
16
作者 Mohammad Reza Aboudzadeh Rovais 《Chinese Journal of Biomedical Engineering(English Edition)》 2004年第4期166-178,共13页
A non-equilibrium chromatographic rate model was employed to simulate the affinity chromatography of urokinase. The chromatography process was developed to a yield of high purity product of urokinase from crude materi... A non-equilibrium chromatographic rate model was employed to simulate the affinity chromatography of urokinase. The chromatography process was developed to a yield of high purity product of urokinase from crude materials. The affinity gel used in the process was prepared by an epichlorohydrin-activation method using epichlorohydrin activated Sepharose 4B as a matrix and p-aminobenzamidine as a ligand. The chromatographic process were numerically simulated and analyzed with the aid of VERSE-LC computer simulator. Considering the basic principles, rate model with the back mixing in column inlet was utilized in simulating and studying the effect of the column inlet pattern on other parameters. Comparison of the simulation results with the experimental data showed that the rate model can be used to describe the affinity chromatography of urokinase in a fixed bed column with satisfactory accuracy. 展开更多
关键词 Rate model simulation affinity chromatography UROKINASE Back mixing
下载PDF
Method and Progress of the Research on Virus Affinity Peptide 被引量:1
17
作者 张娜娜 卢清侠 +3 位作者 滕蔓 杨艳艳 张以芳 张改平 《Agricultural Science & Technology》 CAS 2016年第12期2713-2716,2725,共5页
With the continuous progress on affinity peptide research, it has become more and more popular in pharmacology and medicine. lt is promising to study these viruses affinity peptide to treat infectious diseases. And th... With the continuous progress on affinity peptide research, it has become more and more popular in pharmacology and medicine. lt is promising to study these viruses affinity peptide to treat infectious diseases. And the analysis on the virus affinity peptide with high selectivity and high sensitivity could provide valuable means for disease detection, treatment as wel as the study on the molecular mechanism of virus affinity peptide. Therefore, we reviewed the bioinformatics pre-diction technologies of computer simulation, molecular docking and homology model-ing, as wel as the research method on analyzing and screening virus affinity pep-tide, such as Phage display technology. 展开更多
关键词 Virus affinity peptide BIOINFORMATICS Homology modeling Phage display technology
下载PDF
Experimental and modeling study of kinetics for methane hydrate formation in a crude oil-in-water emulsion 被引量:2
18
作者 Shranish Kar Himangshu Kakati +1 位作者 Ajay Mandal Sukumar Laik 《Petroleum Science》 SCIE CAS CSCD 2016年第3期489-495,共7页
A low-viscosity emulsion of crude oil in water can be believed to be the bulk of a flow regime in a pipeline.To differentiate which crude oil would and which would not counter the blockage of flow due to gas hydrate f... A low-viscosity emulsion of crude oil in water can be believed to be the bulk of a flow regime in a pipeline.To differentiate which crude oil would and which would not counter the blockage of flow due to gas hydrate formation in flow channels,varying amount of crude oil in water emulsion without any other extraneous additives has undergone methane gas hydrate formation in an autoclave cell.Crude oil was able to thermodynamically inhibit the gas hydrate formation as observed from its hydrate stability zone.The normalized rate of hydrate formation in the emulsion has been calculated from an illustrative chemical affinity model,which showed a decrease in the methane consumption(decreased normalized rate constant) with an increase in the oil content in the emulsion.Fourier transform infrared spectroscopy(FTIR) of the emulsion and characteristic properties of the crude oil have been used to find the chemical component that could be pivotal in selfinhibitory characteristic of the crude oil collected from Ankleshwar,India,against a situation of clogged flow due to formation of gas hydrate and establish flow assurance. 展开更多
关键词 Methane gas hydrates Organic inhibitors Chemical affinity model Normalized rate constant Asphaltenes
下载PDF
Adaptive spectral affinity propagation clustering 被引量:1
19
作者 TANG Lin SUN Leilei +1 位作者 GUO Chonghui ZHANG Zhen 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2022年第3期647-664,共18页
Affinity propagation(AP)is a classic clustering algorithm.To improve the classical AP algorithms,we propose a clustering algorithm namely,adaptive spectral affinity propagation(AdaSAP).In particular,we discuss why AP ... Affinity propagation(AP)is a classic clustering algorithm.To improve the classical AP algorithms,we propose a clustering algorithm namely,adaptive spectral affinity propagation(AdaSAP).In particular,we discuss why AP is not suitable for non-spherical clusters and present a unifying view of nine famous arbitrary-shaped clustering algorithms.We propose a strategy of extending AP in non-spherical clustering by constructing category similarity of objects.Leveraging the monotonicity that the clusters’number increases with the self-similarity in AP,we propose a model selection procedure that can determine the number of clusters adaptively.For the parameters introduced by extending AP in non-spherical clustering,we provide a grid-evolving strategy to optimize them automatically.The effectiveness of AdaSAP is evaluated by experiments on both synthetic datasets and real-world clustering tasks.Experimental results validate that the superiority of AdaSAP over benchmark algorithms like the classical AP and spectral clustering algorithms. 展开更多
关键词 affinity propagation(AP) Laplacian eigenmap(LE) arbitrary-shaped cluster model selection
下载PDF
Metal affinities in single and multiple ion adsorption reaction at sulfide mineral surfaces
20
作者 George W.Bailey Alan T.Lynch 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1989年第1期15-30,共16页
Sulfide minerals are found in porous media in both aerobic and anaerobic environments, they should have a high affinities for certain metals. The relative binding affinities and reaction processes for 10 metal/metallo... Sulfide minerals are found in porous media in both aerobic and anaerobic environments, they should have a high affinities for certain metals. The relative binding affinities and reaction processes for 10 metal/metalloid ions reacting with four sulfide mineral surfaces has been defined.The order of reactivity is chalcocite > pyrite > galena >> sphalerite. For any particular metal and mineral, the greater reactivity occurs in the single-ion metal system except Ag(I) on pyrite and Cu(II) on galena.Both precipitation and adsorption reaction can decrease metal ion mobility on porous media, the order of metal mobility in the presence of the four sulfide minerals is predicted to be: Zn(II), Cd(II) and Ni(II) - mobile; Cu(II), Pb(II), Fe(III), As(III) and Cr(III) - variable mobility and Ag(I) - immobile.MINTEQA1 predictions on metal phase distribution / partitioning compared quite well with those observed experimentally. Solubility product considerations, intrinsic acidity constant of the mineral, EH, pH and the carbonate equilibrium are major factors controlling the phase distribution of metals reacting singularly or in combination with sulfide mineral surfaces. 展开更多
关键词 metal affinities sulfide mineral ADSORPTION MINTEQA1 model reduction.
下载PDF
上一页 1 2 26 下一页 到第
使用帮助 返回顶部