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Adaptive robust beamformer formulti-pair two-way relay networks with imperfect channel state information

Jin WANG,Feng SHU,Ri-qing CHEN,Yu-di CUI,Yu CHEN,Jun LI

《信息与电子工程前沿（英文）》 2016年第17卷第3期页码 265-280 doi: 10.1631/FITEE.1500134

摘要： In wideband multi-pair two-way relay networks, the performance of beamforming at a relay station (RS) is intimately related to the accuracy of the channel state information (CSI) available. The accuracy of CSI is determined by Doppler spread, delay between beamforming and channel estimation, and density of pilot symbols, including transmit power of pilot symbols. The coefficient of the Gaussian-Markov CSI error model is modeled as a function of CSI delay, Doppler spread, and signal-to-noise ratio, and can be estimated in real time. In accordance with the real-time estimated coefficients of the error model, an adaptive robust maximum signal-to-interferenceand- noise ratio (Max-SINR) plus maximum signal-to-leakage-and-noise ratio (Max-SLNR) beamformer at an RS is proposed to track the variation of the CSI error. From simulation results and analysis, it is shown that: compared to existing non-adaptive beamformers, the proposed adaptive beamformer is more robust and performs much better in the sense of bit error rate (BER); with increase in the density of transmit pilot symbols, its BER and sum-rate performances tend to those of the beamformer of Max-SINR plus Max-SLNR with ideal CSI.

关键词： Multi-pair two-way relay Adaptive robust beamformer Channel state information (CSI) Maximum signal-to-interference-and-noise ratio (Max-SINR) Maximum signal-to-leakage-and-noise ratio (Max-SLNR)

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基于非完美信道状态的下行OFDMA系统中优化物理层安全问题的资源分配算法研究 None

Wei YANG, Jing MAO, Chen CHEN, Xiang CHENG, Liu-qing YANG, Hai-ge XIANG

《信息与电子工程前沿（英文）》 2018年第19卷第3期页码 398-408 doi: 10.1631/FITEE.1700026

摘要：介绍了一种基于正交频分多址（OFDMA）技术的下行通信系统中优化物理层安全问题的资源分配方案。假设系统中存在多名合法用户和一名采取“被动窃听”方式的非法入侵者，同时考虑基站端收到合法用户和窃听者的信道状态信息均含有误差。讨论了3种非完美信道状态信息情况，分别是：（1）信道信息存在估计误差；（2）信道信息反馈存在时延，需要通过预测估计当前信道状态；（3）反馈信道容量受限，导致量化误差，运用率失真理论可以推导出反馈信道容量的下界。我们把优化问题建模成一个功率和子载波的联合分配问题，优化目标为最大化用户最小的遍历安全容量。该优化问题是一个混合整数非线性规划问题，最优解计算复杂度较高。为降低求解复杂度，提出一种两步次优算法，分别进行子载波分配和功率分配。在给定某种子载波分配方案时，可以通过一种多项式复杂度算法，得出最优功率分配方案。仿真结果证明我们提出的算法在性能上可以逼近最优解。

关键词：资源分配；正交频分多址（OFDMA）；非完美信道状态信息；物理层安全

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Information fusion in aquaculture: a state-of the art review

Shahbaz Gul HASSAN,Murtaza HASAN,Daoliang LI

《农业科学与工程前沿（英文）》 2016年第3卷第3期页码 206-221 doi: 10.15302/J-FASE-2016111

摘要： Efficient fish feeding is currently one of biggest challenges in aquaculture to enhance the production of fish quality and quantity. In this review, an information fusion approach was used to integrate multi-sensor and computer vision techniques to make fish feeding more efficient and accurate. Information fusion is a well-known technology that has been used in different fields of artificial intelligence, robotics, image processing, computer vision, sensors and wireless sensor networks. Information fusion in aquaculture is a growing field of research that is used to enhance the performance of an “industrialized” ecosystem. This review study surveys different fish feeding systems using multi-sensor data fusion, computer vision technology, and different food intake models. In addition, different fish behavior monitoring techniques are discussed, and the parameters of water, pH, dissolved oxygen, turbidity, temperature etc., necessary for the fish feeding process, are examined. Moreover, the different waste management and fish disease diagnosis techniques using different technologies, expert systems and modeling are also reviewed.

关键词： aquaculture computer vision information fusion modeling sensor

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无线信息与能量同时传输的鲁棒协作中继波束形成优化设计 None

Lu-lu ZHAO, Xing-long JIANG, Li-min LI, Guo-qiang ZENG, Hui-jie LIU

《信息与电子工程前沿（英文）》 2018年第19卷第11期页码 1432-1443 doi: 10.1631/FITEE.1601268

摘要：研究了应用于无线信息与能量同时传输的协作中继波束形成设计。基于中继节点拥有理想信道状态信息的假设，提出一种非鲁棒波束形成设计。实际中信道状态信息误差通常不可避免，为此，提出一种鲁棒波束形成设计。采用二分法和半定松弛法解决非鲁棒和鲁棒波束形成设计的非凸优化问题。由于半定松弛法的解不总是秩一的，提出一种迭代次梯度法求秩一解。仿真结果表明，在非理想信道状态信息下，所提鲁棒波束形成设计性能优于非鲁棒设计。

关键词：无线信息与能量同时传输；信道状态信息；鲁棒波束形成；半定松弛；迭代次梯度

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Real-time immune-inspired optimum state-of-charge trajectory estimation using upcoming route information

Ahmad MOZAFFARI,Mahyar VAJEDI,Nasser L. AZAD

《机械工程前沿（英文）》 2015年第10卷第2期页码 154-167 doi: 10.1007/s11465-015-0336-z

摘要：

The main proposition of the current investigation is to develop a computational intelligence-based framework which can be used for the real-time estimation of optimum battery state-of-charge (SOC) trajectory in plug-in hybrid electric vehicles (PHEVs). The estimated SOC trajectory can be then employed for an intelligent power management to significantly improve the fuel economy of the vehicle. The devised intelligent SOC trajectory builder takes advantage of the upcoming route information preview to achieve the lowest possible total cost of electricity and fossil fuel. To reduce the complexity of real-time optimization, the authors propose an immune system-based clustering approach which allows categorizing the route information into a predefined number of segments. The intelligent real-time optimizer is also inspired on the basis of interactions in biological immune systems, and is called artificial immune algorithm (AIA). The objective function of the optimizer is derived from a computationally efficient artificial neural network (ANN) which is trained by a database obtained from a high-fidelity model of the vehicle built in the Autonomie software. The simulation results demonstrate that the integration of immune inspired clustering tool, AIA and ANN, will result in a powerful framework which can generate a near global optimum SOC trajectory for the baseline vehicle, that is, the Toyota Prius PHEV. The outcomes of the current investigation prove that by taking advantage of intelligent approaches, it is possible to design a computationally efficient and powerful SOC trajectory builder for the intelligent power management of PHEVs.

关键词： trip information preview intelligent transportation state-of-charge trajectory builder immune systems artificial neural network

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Engineering Informatics: State of the Art and Future Trends

Li-da Xu

《工程管理前沿（英文）》 2014年第1卷第3期页码 270-282 doi: 10.15302/J-FEM-2014038

摘要： Engineering informatics is an emerging engineering discipline integrating information technology or informatics with a variety of engineering disciplines. It is an interdisciplinary scientific subject focusing on applying advanced information and communications technology (ICT) to a variety of engineering disciplines. Rapid advances in industrial information integration methods have spurred the growth of new techniques that can be used for probing industrial information integration including engineering informatics. These techniques include business process management (BPM), enterprise architecture (EA), enterprise application integration (EAI), service-oriented architecture (SOA), and others. Practical applications may require a combination of these techniques that have originated from different disciplines. These techniques have the potential to contribute to engineering informatics. For integrating complex engineering systems, both formal methods and systems methods are crucial. In this paper, we briefl review the state of the art of engineering informatics as it interfacing with industrial information integration.

关键词： engineering informatics industrial integration industrial information integration engineering (IIIE) engineering management

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开放通道固态硬盘的设计与应用研究综述 Review Article

陈军超1,2,3,张广艳1,3,魏钧宇1,3

《信息与电子工程前沿（英文）》 2023年第24卷第5期页码 637-658 doi: 10.1631/FITEE.2200317

摘要：与传统的固态硬盘（SSDs）相比，开放通道固态硬盘（OCSSDs）向外暴露了它们的内部物理布局，并提供了一个基于主机端的闪存转换层（FTL），使得它允许主机端软件根据具体场景和需求控制其内部操作，如垃圾回收（GC）和输入/输出（I/O）调度等。本文对近年来基于OCSSDs的研究工作进行了全面的调研，总结了它们如何利用OCSSDs的特性来实现高吞吐量、低访问延迟、长寿命、强性能隔离和高资源利用率等目标，并从接口定制、FTL协同设计、内部并行性挖掘、I/O调度和GC处理等五个方面对这些工作进行了深入的研究分析。我们讨论了目前研究工作的优势和不足，并发现几乎所有的这些研究方法都面临着性能有效性和管理复杂性之间的困境。本文旨在通过开展综述调研能为希望进入这一领域的研究人员提供关于OCSSDs的基础知识，并进一步激发他们在相关研究工作中的新想法。

关键词：领域专用存储；闪存转换层；垃圾回收；内部并行性；开放通道固态硬盘（OCSSDs）

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A cellphone-based colorimetric multi-channel sensor for water environmental monitoring

《环境科学与工程前沿（英文）》 2022年第16卷第12期 doi: 10.1007/s11783-022-1590-z

摘要：

● A cellphone-based colorimetric multi-channel sensor for in-field detection.

关键词： Colorimetric analysis Multi-channel sensor Cellphone Water quality indexes Environmental monitoring

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Analysis of nonlinear channel friction inverse problem

CHENG Weiping, LIU Guohua

《结构与土木工程前沿（英文）》 2007年第1卷第2期页码 205-210 doi: 10.1007/s11709-007-0024-0

摘要： Based on the Backus-Gilbert inverse theory, the singular value decomposition (SVD) for general inverse matrices and the optimization algorithm are used to solve the channel friction inverse problem. The resolution and covariance friction inverse model in matrix form is developed to examine the reliability of solutions. Theoretical analyses demonstrate that the convergence rate of the general Newton optimization algorithm is in the second-order. The Wiggins method is also incorporated into the algorithm. Using the method, noise can be suppressed effectively, and the results are close to accurate solutions with proper control parameters. Also, the numerical stability can be improved.

关键词： singular SVD second-order covariance Theoretical

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基于切换和迁移多执行体架构虚拟机的云侧信道攻击防御技术 Regular Papers

Chao YANG, Yun-fei GUO, Hong-chao HU, Ya-wen WANG, Qing TONG, Ling-shu LI

《信息与电子工程前沿（英文）》 2019年第20卷第5期页码 731-748 doi: 10.1631/FITEE.1800526

摘要：云中不同租户的虚拟机共存为以信息泄露为目标的侧信道攻击创造了便利条件。然而，当前绝大多数防御技术都存在通用性或兼容性问题，无法在真实环境下实现快速部署。作为云系统固有功能之一，虚拟机迁移机制可通过在服务器之间迁移虚拟机，限制租户共存，从而提供一种具有应用前景的防御思路。本文首先建立一个统一的攻击模型，攻击者关注的目标是有效侧信道攻击。设计了一种包含多执行架构虚拟机的新型云系统：Driftor。对于其中每个虚拟机，同一时刻有且仅有一个执行体处于运行状态，并通过代理提供服务，以此降低可能泄漏的信息量。为模拟虚拟机迁移机制，系统将在虚拟机不同执行体之前周期性切换运行状态，同时通过真实迁移操作加强防御效果。为解决CIRCUIT-SAT求解迁移问题时的弱扩展性，本文提出一种类贪婪算法，通过逐渐扩展必须迁移的虚拟机子集搜索可行解。实验结果表明，Driftor能有效防御快速侧信道攻击，且针对真实云应用的防御开销较小。

关键词：云计算；侧信道攻击；信息泄露；多执行体架构；虚拟机切换；虚拟机迁移

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基于人的信息处理模型分析操作人员视觉信息处理过程

金银花,李桢业,古辉,汤一平

《中国工程科学》 2007年第9卷第5期页码 57-61

摘要：

报告了由知觉、思维、运动３个处理器和短期记忆、工作记忆和长期记忆构成的研究用计算机实现人的信息处理模型；把人的信息处理模型安装在一台PC机上，模拟生产操作人员监视锅炉厂模拟机计算机屏幕的过程表明，视觉信息处理过程取决于画面因素、人的身心状态和知觉处理器参数等与实际生产操作人员的行为特征相符。此模型可以用来分析工业生产中人为操作失误的发生机制，以预防和减少事故发生。

关键词：人的信息处理模型知觉处理器视觉信息处理心理状态人为操作失误

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Improvement of solidification model and analysis of 3D channel blockage with MPS method

《能源前沿（英文）》 2021年第15卷第4期页码 946-958 doi: 10.1007/s11708-021-0754-z

摘要： In a severe accident of a nuclear power reactor, coolant channel blockage by solidified molten core debris may significantly influence the core degradations that follow. The moving particle semi-implicit (MPS) method is one of the Lagrangian-based particle methods for analyzing incompressible flows. In the study described in this paper, a novel solidification model for analyzing melt flowing channel blockage with the MPS method has been developed, which is suitable to attain a sufficient numerical accuracy with a reasonable calculation cost. The prompt velocity diffusion by viscosity is prioritized over the prompt velocity correction by the pressure term (for assuring incompressibility) within each time step over the “mushy zone” (between the solidus and liquidus temperature) for accurate modeling of solidification before fixing the coordinates of the completely solidified particles. To sustain the numerical accuracy and stability, the corrective matrix and particle shifting techniques have been applied to correct the discretization errors from irregular particle arrangements and to recover the regular particle arrangements, respectively. To validate the newly developed algorithm, 2-D benchmark analyses are conducted for steady-state freezing of the water in a laminar flow between two parallel plates. Furthermore, 3-D channel blockage analyses of a boiling water reactor (BWR) fuel support piece have been performed. The results show that a partial channel blockage develops from the vicinity of the speed limiter, which does not fully develop into a complete channel blockage, but still diverts the incoming melt flow that follows to the orifice region.

关键词： boiling water reactor (BWR) severe accident channel blockage moving particle semi-implicit (MPS) method solidification

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Experimental investigation of liquid metal alloy based mini-channel heat exchanger for high power electronic

Manli LUO, Jing LIU

《能源前沿（英文）》 2013年第7卷第4期页码 479-486 doi: 10.1007/s11708-013-0277-3

摘要： There is currently a growing demand for developing efficient techniques for cooling integrated electronic devices with ever increasing heat generation power. To better tackle the high-density heat dissipation difficulty within the limited space, this paper is dedicated to clarify the heat transfer behaviors of the liquid metal flowing in mini-channel exchangers with different geometric configurations. A series of comparative experiments using liquid metal alloy Ga68%In20%Sn12% as coolant were conducted under prescribed mass flow rates in three kinds of heat exchangers with varied geometric sizes. Meanwhile, numerical simulations for the heat exchangers under the same working conditions were also performed which well interpreted the experimental measurements. The simulated heat sources were all cooled down by these three heat dissipation apparatuses and the exchanger with the smallest channel width was found to have the largest mean heat transfer coefficient at all conditions due to its much larger heat transfer area. Further, the present work has also developed a correlation equation for characterizing the Nusselt number depending on Peclet number, which is applicable to the low Peclet number case with constant heat flux in the hydrodynamically developed and thermally developing region in the rectangular channel. This study is expected to provide valuable reference for designing future liquid metal based mini-channel heat exchanger.

关键词： heat exchanger liquid metal mini-channel heat dissipation heat transfer coefficient

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Effect of Joule heating on electro-osmotic flow in a closed-end micro-channel with isothermal and convective

Liang ZHAO, Linhua LIU,

《能源前沿（英文）》 2009年第3卷第4期页码 381-388 doi: 10.1007/s11708-009-0057-2

摘要： The effect of Joule heating on the steady state electro-osmotic flow in a closed-end micro-channel is studied through numerical simulation with the finite volume method. The velocity field and the temperature field are described by a rigorous mathematical model. Thermophysical properties including viscosity and thermal conductivity are considered to be temperature-dependent. The simulations show that the presence of Joule heating causes an increase in temperature and a decrease in viscosity in the whole micro-channel, which, thereafter, induce a large velocity near the wall and an increase in fluid velocity at the central region in order to maintain a zero flow rate at the cross section of the micro-channel. The effect of Joule heating on the induced pressure gradient is also studied, which is very important for the application of the closed-end micro-channel as a micro-actuator. The results reveal that the induced pressure gradient, taking into consideration Joule heating, is significantly smaller than that without considering Joule heating when the wall temperature of the micro-channel is constant. The induced pressure gradient difference between considering Joule heating and without considering Joule heating is small under the convective boundary condition.

关键词： closed-end micro-channel electrical double layer electro-osmotic flow induced pressure gradient Joule heating

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Understanding channel tropism in traditional Chinese medicine in the context of systems biology

null

《医学前沿（英文）》 2013年第7卷第3期页码 277-279 doi: 10.1007/s11684-013-0273-3

摘要：

Channel tropism is investigated and developed through long-term clinical practice. In recent years, the development of channel tropism theory has attracted increasing attention. This study analyzed channel tropism theory and the problems associated with it. Results showed that this theory and systems biology have a similar holistic viewpoint. Systems biology could provide novel insights and platform in the study of channel tropism. Some problems in channel tropism theory, including pharmacology and action mechanism, were investigated.

关键词： systems biology channel tropism theory traditional Chinese medicine application