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基于马蒙算法地质统计学反演的缝洞储集体预测 被引量:6
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作者 韩东 胡向阳 +4 位作者 邬兴威 刘坤岩 司朝年 付鑫 贾志坤 《物探与化探》 CAS CSCD 2015年第6期1211-1216,共6页
塔河油田缝洞储集体空间非均质性强,基于地震资料的确定性预测方法表征缝洞储集体时存在多解性。采用一种基于马蒙算法的地质统计学反演方法实现了缝洞储集体的定量预测并作出不确定性评价。首先从地质、地球物理角度获取目标区储集体... 塔河油田缝洞储集体空间非均质性强,基于地震资料的确定性预测方法表征缝洞储集体时存在多解性。采用一种基于马蒙算法的地质统计学反演方法实现了缝洞储集体的定量预测并作出不确定性评价。首先从地质、地球物理角度获取目标区储集体发育的先验信息,再进行地质统计学参数的实验调试,最终利用地质统计学反演获得储集体岩相类型结果及波阻抗结果的多个实现,并对预测结果作出不确定性评价。该方法提供了一种地震数据主导的缝洞储集体定量预测手段,能够较好地解决溶洞储集体纵向深度归位、地震预测成果不确定评价问题,对于该类油藏的地质建模表征具有指导意义。 展开更多
关键词 缝洞型油藏 储集体预测 马蒙算法 地质统计学反演 不确定性评价
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The RSA Cryptoprocessor Hardware Implementation Based on Modified Montgomery Algorithm 被引量:2
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作者 陈波 王旭 戎蒙恬 《Journal of Shanghai Jiaotong university(Science)》 EI 2005年第2期107-111,共5页
RSA(Rivest-Shamir-Adleman)public-key cryptosystem is widely used in the information security area such as encryption and digital signature. Based on the modified Montgomery modular multiplication algorithm, a new arch... RSA(Rivest-Shamir-Adleman)public-key cryptosystem is widely used in the information security area such as encryption and digital signature. Based on the modified Montgomery modular multiplication algorithm, a new architecture using CSA(carry save adder)was presented to implement modular multiplication. Compared with the popular modular multiplication algorithms using two CSA, the presented algorithm uses only one CSA, so it can improve the time efficiency of RSA cryptoprocessor and save about half of hardware resources for modular multiplication. With the increase of encryption data size n, the clock cycles for the encryption procedure reduce in (T(n^2),) compared with the modular multiplication algorithms using two CSA. 展开更多
关键词 Montgomery algorithm modular multiplication modular exponentiation
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FPGA IMPLEMENTATION OF RSA PUBLIC-KEY CRYPTOGRAPHIC COPROCESSOR BASED ON SYSTOLIC LINEAR ARRAY ARCHITECTURE 被引量:2
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作者 Wen Nuan Dai Zibin Zhang Yongfu 《Journal of Electronics(China)》 2006年第5期718-722,共5页
In order to make the typical Montgomery’s algorithm suitable for implementation on FPGA, a modified version is proposed and then a high-performance systolic linear array architecture is designed for RSA cryptosystem ... In order to make the typical Montgomery’s algorithm suitable for implementation on FPGA, a modified version is proposed and then a high-performance systolic linear array architecture is designed for RSA cryptosystem on the basis of the optimized algorithm. The proposed systolic array architecture has dis- tinctive features, i.e. not only the computation speed is significantly fast but also the hardware overhead is drastically decreased. As a major practical result, the paper shows that it is possible to implement public-key cryptosystem at secure bit lengths on a single commercially available FPGA. 展开更多
关键词 RSA Montgomery's algorithm Systolic linear array Modular multiplication Modular exponentiation
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One-step random-walk process of nanoparticles in cement-based materials 被引量:2
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作者 Ali BAHARI Aref SADEGHI-NIK +3 位作者 Elena CERRO-PRADA Adel SADEGHI-NIK Mandana ROODBARI Yan ZHUGE 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第6期1679-1691,共13页
Efficient modelling approaches capable of predicting the behavior and effects of nanoparticles in cement-based materials are required for conducting relevant experiments.From the microstructural characterization of a ... Efficient modelling approaches capable of predicting the behavior and effects of nanoparticles in cement-based materials are required for conducting relevant experiments.From the microstructural characterization of a cement-nanoparticle system,this paper investigates the potential of cell-based weighted random-walk method to establish statistically significant relationships between chemical bonding and diffusion processes of nanoparticles within cement matrix.LaSr_(0.5)C_(0.5)O_(3)(LSCO)nanoparticles were employed to develop a discrete event system that accounts for the behavior of individual cells where nanoparticles and cement components were expected to interact.The stochastic model is based on annihilation(loss)and creation(gain)of a bond in the cell.The model considers both chemical reactions and transport mechanism of nanoparticles from cementitious cells,along with cement hydration process.This approach may be useful for simulating nanoparticle transport in complex 2D cement-based materials systems. 展开更多
关键词 Markov chain Monte Carlo random-walk method Fokker-Planck equation LaSr_(0.5)C_(0.5)O_(3)(LSCO) CEMENT nanoparticle incorporation
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Potential-Decomposition Strategy in Markov Chain Monte Carlo Sampling Algorithms
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作者 上官丹骅 包景东 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第11期854-856,共3页
We introduce the potential-decomposition strategy (PDS), which can be used in Markov chain Monte Carlo sampling algorithms. PDS can be designed to make particles move in a modified potential that favors diffusion in... We introduce the potential-decomposition strategy (PDS), which can be used in Markov chain Monte Carlo sampling algorithms. PDS can be designed to make particles move in a modified potential that favors diffusion in phase space, then, by rejecting some trial samples, the target distributions can be sampled in an unbiased manner. Furthermore, if the accepted trial samples are insumcient, they can be recycled as initial states to form more unbiased samples. This strategy can greatly improve efficiency when the original potential has multiple metastable states separated by large barriers. We apply PDS to the 2d Ising model and a double-well potential model with a large barrier, demonstrating in these two representative examples that convergence is accelerated by orders of magnitude. 展开更多
关键词 potential-decomposition strategy Markov chain Monte Carlo sampling algorithms
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基于地质统计学反演的缝洞储集体物性定量评价 被引量:9
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作者 韩东 胡向阳 +5 位作者 邬兴威 刘坤岩 司朝年 王鹏 解丽慧 韩科龙 《地球物理学进展》 CSCD 北大核心 2016年第2期655-661,共7页
塔河油田奥体系发育孔、洞、缝等多种储集体,空间非均质性极强.定量刻画不同类型储集体及其物性在三维空间的展布一直是该类油藏开发的技术难题.本文采用一种基于马蒙算法的地质统计学反演方法,结合地质、测井先验信息,获得表征缝洞储... 塔河油田奥体系发育孔、洞、缝等多种储集体,空间非均质性极强.定量刻画不同类型储集体及其物性在三维空间的展布一直是该类油藏开发的技术难题.本文采用一种基于马蒙算法的地质统计学反演方法,结合地质、测井先验信息,获得表征缝洞储集体类型及反映物性参数的纵波阻抗数据.再通过寻找波阻抗与储集体孔隙度之间的统计关系,利用一种"云变换"手段,协模拟得到缝洞储集体等效孔隙度数据体,以此从物性角度定量评价缝洞储集体的空间非均质性.与常规方法对比说明,该方法评价结果与井点解释物性有较高的吻合程度,井间趋势上更加尊重地震响应特征,是一种地震数据主控的储集体物性评价方法,对于强非均质性油藏的物性发育规律评价具有指导意义. 展开更多
关键词 缝洞储集体 马蒙算法 地质统计学反演 云变换 物性评价
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