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1. chinaXiv:201706.00748 [pdf]

基于改进BP神经网络的A股投资实证研究

闫昱; 李皓辰; 王燕飞; 经玲
分类: 计算机科学 >> 计算机应用技术

量化投资一直是国内外学者关注的热点问题,针对使用BP神经网络预测股票市场的相关问题,本文在对数据进行统计学上的数据预处理后,交替采用了遗传算法和模拟退火算法优化了BP神经网络的参数,并对A股市场中的股票进行预测。在此基础上,进行了为期十年的模拟交易,最终获得了24.1%的年化收益率。

提交时间: 2017年06月22日 点击量:160, 下载量:29

2. chinaXiv:201703.00895 [pdf]

Sharing deep generative representation for perceived image reconstruction from human brain activity

Du, Changde; Du, Changying; He, Huiguang
分类: 计算机科学 >> 计算机应用技术

Decoding human brain activities via functional magnetic resonance imaging (fMRI) has gained increasing attention in recent years. While encouraging results have been reported in brain states classification tasks, reconstructing the details of human visual experience still remains difficult. Two main challenges that hinder the development of effective models are the perplexing fMRI measurement noise and the high dimensionality of limited data instances. Existing methods generally suffer from one or both of these issues and yield dissatisfactory results. In this paper, we tackle this problem by casting the reconstruction of visual stimulus as the Bayesian inference of missing view in a multiview latent variable model. Sharing a common latent representation, our joint generative model of external stimulus and brain response is not only ``deep" in extracting nonlinear features from visual images, but also powerful in capturing correlations among voxel activities of fMRI recordings. The nonlinearity and deep structure endow our model with strong representation ability, while the correlations of voxel activities are critical for suppressing noise and improving prediction. We devise an efficient variational Bayesian method to infer the latent variables and the model parameters. To further improve the reconstruction accuracy, the latent representations of testing instances are enforced to be close to that of their neighbours from the training set via posterior regularization. Experiments on three fMRI recording datasets demonstrate that our approach can more accurately reconstruct visual stimuli.

提交时间: 2017年05月20日 点击量:4001, 下载量:572

3. chinaXiv:201705.00836 [pdf]

基于互联网支付技术的货币自动兑换机

周志坚; 杨贵中; 刘宏杰; 汪银盘
分类: 计算机科学 >> 计算机应用技术

摘 要:随着互联网支付技术的快速发展,本文研究了一种利用微信支付技术实现自动兑换硬币功能的设备,用于解决日常生活中小面额货币的兑换问题,实现“零现金”出行。该设备具有小面额纸币兑换硬币和微信支付兑换硬币的功能。针对该设备的软硬件模块、整体布局、设备的稳定性和兑换的准确性,本文进行了相关设计和研究。实验结果表明,该设备安全稳定,能够满足日常生活中的兑换需求。

提交时间: 2017年05月15日 点击量:987, 下载量:102

4. chinaXiv:201703.00905 [pdf]

Applying Ricci flow to Manifold Learning

Li, Yangyang; Lu, Ruqian
分类: 计算机科学 >> 计算机软件

Traditional manifold learning algorithms often bear an assumption that the local neighborhood of any point on embedded manifold is roughly equal to the tangent space at that point without considering the curvature. The curvature indifferent way of manifold processing often makes traditional dimension reduction poorly neighborhood preserving. To overcome this drawback we propose a new algorithm called RF-ML to perform an operation on the manifold with help of Ricci flow before reducing the dimension of manifold.

提交时间: 2017年04月10日 点击量:307, 下载量:222

5. chinaXiv:201703.00899 [pdf]

激光共聚焦显微成像数据采集系统设计

薛晓君
分类: 计算机科学 >> 计算机应用技术

激光共聚焦显微成像技术能够有效的排除非焦平面的信息,提高了光学显微成像的分辨率和对比度。针对激光共聚焦显微成像系统的点扫描成像过程,基于LabVIEW平台开发了数据采集系统,该系统不仅能够对数据进行采集,还能将数据准确的重建为图像并实时显示。数据采集系统采用生产者-消费者模型作为基础架构,通过两个同步信号分别实现了图像的帧同步和行同步,确保了重建图像的准确性。通过对生物样本进行试验,该系统能够将样本图像实时准确的显示出来,满足了整个显微成像系统的要求。

提交时间: 2017年03月28日 点击量:1144, 下载量:243

6. chinaXiv:201703.00877 [pdf]

Optical hiding with visual cryptography

Shi, Yishi; Yang, Xiubo
分类: 物理学 >> 电磁学、光学、声学、传热、经典力学和流体动力学 计算机科学 >> 信息安全

Classical optical hiding methods are symmetric, being apt to realize but not secure. The security is improved in existing non-symmetric hiding techniques, yet all of them fails in convenient extractions, still not optically realized so far. Here, we propose an asymmetric optical hiding method based on visual cryptography, achieving the high security and the easy extraction at the same time. In the hiding process, we convert the secret information into a set of fabricated phase-keys, which are completely independent of each other, intensity-detected-proof, and image-covered, this complex hiding procedure leading to the high security. Correspondingly, during the extraction process, the covered phase-keys are illuminated with laser beams and then incoherent superposed to extract the hidden information directly by human visual system, without complicated optical implementations and any additional computation, resulting in the convenience of extracting. Optical experiments verify that both the high security and the easy extraction are obtainable in the visual-cryptography-based optical hiding.

提交时间: 2017年03月28日 点击量:1208, 下载量:212

7. chinaXiv:201703.00523 [pdf]

彩巢计划-“成长在中国”: 学龄儿童青少年脑与行为 生长发育曲线项目

杨宁; 何叶; 张喆; 董昊铭; 张蕾; 朱幸婷; 侯晓晖; 王银山; 周荃; 宫竹青; 曹立智; 王平; 张一文; 隋丹阳; 徐婷; 魏高峡; 杨志; 姜黎黎; 李会杰; 冯廷勇
分类: 生物学 >> 生物医药 生物学 >> 神经生物学 数学 >> 应用数学 计算机科学 >> 计算机应用技术 生物学 >> 生物数学

摘要:[目的] 介绍“中国彩巢计划:成长在中国(Chinese Color Nest Project – CCNP: Growing Up in China 2013-2022)”大型学龄儿童青少年脑与行为生长曲线项目。[方法] 在全国范围内分期分步地开展毕生发展各年龄段的心理行为与脑影像样本积累,未来十年 CCNP 将基于加速纵向实验设计方法,建立中国人脑毕生发展的常模轨线。[结果] 作为“彩巢”计划的脑发育项目,devCCNP 已经完成对重庆北碚区 192 名健康儿童青少年(6-18 岁)的 5 年追踪。[结论] devCCNP就实验设计、样本采集策略、数据获取和存储、初步结果和数据共享等方面都说明本计划具备长期实施的可行性。

提交时间: 2017年03月23日 点击量:3565, 下载量:800

8. chinaXiv:201703.00347 [pdf]

Towards Brain-like Information Processing based on Quantum Cognitive Computing

Dawei Song
Comment:预备申请
分类: 物理学 >> 普通物理:统计和量子力学,量子信息等 计算机科学 >> 计算机科学的集成理论

As the next stage of Artificial Intelligence, Brain-like Intelligent Computing will be considered as a fundamental role in the forthcoming China Brain Project. Researchers have tried to use the brain frame structure and the brain functions, aiming at developing a new generation of information theory and computational methods (such as a new generation of artificial intelligence systems). Different from the traditional information processing based on the classical physics and logics, the human brain should rely on a deeper level physics (such as quantum mechanics) to process information, generate awareness and consciousness. The project will try to exploit quantum information theory in the human cognition related information interaction and processing models. The overall research goal is: in typical information interaction scenarios (such as exploratory information access and natural language understanding), modeling the non-classical (quantum or quantum-like) experimental phenomenon, developing quantum models of cognitive behavior, and establishing a new framework of brain-like information interaction model, with the application in typical tasks for information interaction scenarios.

提交时间: 2017年03月15日 点击量:385, 下载量:225

9. chinaXiv:201703.00313 [pdf]

Linear interpolation of shape operators for umbilical points via local parameterization

Che, Wujun
分类: 计算机科学 >> 计算机应用技术

Principal curvatures and principal directions are exploited ubiquitously in shape analysis. On one hand, umbilical points severely hinder the analysis as the singularities in the vector field of principal directions; on the other hand, providing shape-intrinsic qualitative information about a surface, they are desirable quantities in some applications. Umbilical points are fundamental for geometric analysis, but their accurate computation on a discrete surface is still challenging. In this paper, we develop a simple and effective method to detect umbilical points on a triangle mesh, in which any parametrization works. In particular, we propose two practical processes for local parametrization by orthogonally projecting or conformally transforming the matrix onto a specified parametric plane. Furthermore, we make a systematic analysis on our method and demonstrate its convergence behavior. The algorithm of our approach is flexible and easy to implement for a triangular mesh of arbitrary topology.

提交时间: 2017年03月10日 点击量:1127, 下载量:153

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