基于模糊处理的医疗信息数据存储系统的设计

为了提高医疗技术水平,加快医务人员对医疗信息数据的分析,使医疗信息数据运行更加顺畅,减少数据存储所占空间,需要对医疗信息数据存储系统进行设计。当前的医疗信息数据存储系统对医疗信息数据进行存储时,利用FPGA构建系统硬件,以硬件为基础将医疗信息数据存储,但在存储过程中,没有将冗余数据清除,导致存储空间易满,容量变小,存在正常医疗信息数据无处安放的问题。为此,提出一种基于模糊处理的医疗信息数据存储系统设计方法。该方法首先对医疗信息数据的来源进行统计,根据数据来源实现医疗数据的硬件构造,然后利用医疗信息数据中特征相似数据间的中介点实现数据聚类,完成对医疗信息数据的聚类存储,最后采用高斯混合模型对冗余医疗数据进行特征分析,以分析结果为基础,利用分数阶Fourier变换对冗余医疗信息数据进行删除操作,由此完成了基于模糊处理的医疗信息数据存储。实验结果证明,所提方法增加数据存储空间容量,减少对冗余数据的存储,加快医疗信息数据的存储速度,提高数据存储精度,为该领域研究发展提供强有力的依据。     

A convolutional neural network approach to calibrating the rotation axis for X‐ray computed tomography

This paper presents an algorithm to calibrate the center‐of‐rotation for X‐ray tomography by using a machine learning approach, the Convolutional Neural Network (CNN). The algorithm shows excellent accuracy from the evaluation of synthetic data with various noise ratios. It is further validated with experimental data of four different shale samples measured at the Advanced Photon Source and at the Swiss Light Source. The results are as good as those determined by visual inspection and show better robustness than conventional methods. CNN has also great potential for reducing or removing other artifacts caused by instrument instability, detector non‐linearity, etc. An open‐source toolbox, which integrates the CNN methods described in this paper, is freely available through GitHub at tomography/xlearn and can be easily integrated into existing computational pipelines available at various synchrotron facilities. Source code, documentation and information on how to contribute are also provided.     

用于解决大规模波长路由光网中路由和波长分配问题的新启发式算法

本文提出了一种新的启发式算法,它将路由和波长分配问题分解为两个子问题分别进行优化求解,并以最小化波长需求作为目标函数。在不同通信负荷的情况下,我们以NSF网为例,分析了波长通道(WP)和虚波长通道(VWP)路由方案之间在波长需求方面的差别。同时还研究了网络波长重用度的问题。数值结果表明所提出的算法可有效地应用于大规模波长路由光网。     

用微机处理冷却实验数据

利用微机研究金属冷却规律。     

Optimal estimation in random coefficient regression models

In linear regression models with random coefficients, the score function usually involves unknown nuisance parameters in the form of weights. Conditioning with respect to the sufficient statistics for the nuisance parameter, when the parameter of interest is held fixed, eliminates the nuisance parameters and is expected to give reasonably good estimating functions. The present paper adopts this approach to the problem of estimation of average slope in random coefficient regression models. Four sampling situations are discussed. Some asymptotic results are also obtained for a model where neither the regressors nor the random regression coefficients replicate. Simulation studies for normal as well as non-normal models show that the performance of the suggested estimating functions is quite satisfactory.     

Revised multi-choice goal programming for multi-period,multi-stage inventory controlled supply chain model with popup stores in Guerrilla marketing

In this paper, we consider a supply chain network design problem with popup stores which can be opened for a few weeks or months before closing seasonally in a marketplace. The proposed model is multi-period and multi-stage with multi-choice goals under inventory management constraints and formulated by 0–1 mixed integer linear programming. The design tasks of the problem involve the choice of the popup stores to be opened and the distribution network design to satisfy the demand with three multi-choice goals. The first goal is minimization of the sum of transportation costs in all stages; the second is to minimization of set up costs of popup stores; and the third goal is minimization of inventory holding and backordering costs. Revised multi-choice goal programming approach is applied to solve this mixed integer linear programming model. Also, we provide a real-world industrial case to demonstrate how the proposed model works.     

X射线能量谱间接测量方法

X光机的X射线能量谱在CT图像硬化校正、散射校正和定量CT成像等技术中扮演着重要角色。提出了一种通过由质量衰减系数已知的材料构成的楔型模体的扫描数据来恢复X射线能量谱的方法。经GEANT4模拟数据及实采数据验证,该方法能够较好地恢复X光机的X射线能量谱。通过仿真实验,分析了在几个常用电压下模体材质和厚度对恢复X射线能量谱的影响。     

大气激光通信链路的性能仿真

大气衰减和大气湍流严重影响着大气激光通信的链路质量。建立了大气信道的激光通信链路模型，研究了衰减信道和湍流信道中光链路的传输影响，对最大通信速率、链路功率余量和误码率进行了分析和计算。结果表明，大气湍流严重影响系统误码率，当大气闪烁指数斫是0．07时，可达到的最小误码率为10^-9。分析结果可为系统设计提供参考依据。     

基于近红外光谱技术的石油组分定量分析新方法

针对石油化工产品生产控制和质量检查的需要,为提高测定产品组成的效率,将近红外光谱法作为基础测定方法,以直馏柴油、加氢精制柴油和催化裂化柴油为校正模型的训练样本,测定其中饱和烃、胶质、单环芳烃、双环芳烃、三环芳烃和环烷烃的组成,论述了采用模糊神经网络建立校正模型测定石油化工产品组成的可行性。基于dSPACE硬件平台,用验证样本对模糊神经网络校正模型进行了检验,实验结果表明,该方法响应快、误差小、鲁棒性强,在近红外长波区内,校正样品和验证样品的均方误差小于10-6。该方法可用于石油化工产品的生产工艺研究中。     

Fine-structure energy levels, oscillator strengths and lifetimes in Co XV

Excitation energies from ground state for 97 fine-structure levels as well as oscillator strengths and radiative decay rates for all electric-dipole-allowed and intercombination transitions among the fine-structure levels of the terms belonging to the (1s ²2s ²2p ⁶)3s ²3p, 3s ³ p ², 3s ²3d, 3p ³, 3s3p3d, 3p ²3d, 3s3d ², 3s ²4s, 3s ²4p, 3s ²4d, 3s ²4f, and 3s3p4s configurations of Co XV are calculated, using extensive configuration-interaction (CI) wave functions, obtained with the CIV3 computer code of Hibbert. The important relativistic effects in intermediate coupling are included through the Breit-Pauli approximation via spin-orbit, spin-other-orbit, spin-spin, Darwin and mass correction terms. Small adjustments to the diagonal elements of the Hamiltonian matrices have been made. Our calculated excitation energies, including their ordering, are in excellent agreement with the experimental results and the experimentally compiled energy values of the National Institute for Standards and Technology (NIST) wherever available. The mixing among several fine-structure levels is found to be very strong, with most of the strongly mixed levels belonging to the (1s ²2s ²2p ⁶)3p ²3d and 3s3d ² configurations. The strong mixing among several fine-structure levels makes it very difficult to identify them uniquely. Perhaps, that may be the reason for the lack of both experimental and theoretical results for these levels. We believe that our extensive calculated values can guide experimentalists in identifying the fine-structure levels in their future work. From our radiative decay rates we have also calculated radiative lifetimes of some fine-structure levels. In this calculation we also predict new data for several fine-structure levels where no other theoretical and/or experimental results are available.