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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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双向中继传输中基于半定松弛的非相干检测 Regular Papers-Research Articles

Chan-fei WANG, Ji-ai HE, Wei-fang WANG, Ya-mei XU

《信息与电子工程前沿（英文）》 2019年第20卷第9期页码 1259-1265 doi: 10.1631/FITEE.1800096

摘要：提出一种双向中继传输广播阶段高性能非相干传输方案，即不需要信道估计的多符号差分检测算法。在下行阶段首次引入基于广义似然比检验的多符号差分检测（GLRT-MSDD）。进一步转换GLRT-MSDD，得到基于半定松弛的多符号差分检测（SDR-MSDD），此转化过程降低了算法实现的复杂度。性能分析和仿真结果表明，在双向中继传输中，所提SDR-MSDD方法以合理复杂度得到接近于GLRT-MSDD方法的误码性能。

关键词：多符号差分检测；广义似然比检验；半定松弛；双向中继传输

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一种新颖的多小区正交频分多址中继网络资源优化分配算法 Article

Ning DU,Fa-sheng LIU

《信息与电子工程前沿（英文）》 2016年第17卷第8期页码 825-833 doi: 10.1631/FITEE.1500294

摘要：在蜂窝网络中，用户通过各自的基站相互通信，且通常位于不同的小区内。对于用户来说，基站相当于一个解码转发中继节点。除了这种传统的用户之外，我们认为相互之间需要通信的用户还可以位于同一小区内，由此产生小区内通信。在这种情况下，基站可作为双向中继取代传统的解码转发中继，实现信息交换。多小区正交频分多址网络同时包含了这两种类型的用户。其中，资源优化分配是我们的研究重点。特别地，我们联合优化子载波分配、子载波成对和功率分配，从而最大化加权速率。通过拉格朗日对偶分解近似求解在用户功率固定的情况下基站资源的最优化问题。仿真结果表明，本文提出的策略优于现有的策略。

关键词：双向中继；子载波分配；子载波成对

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Performance analysis for a two-way relaying power line networkwith analog network coding

Yu-wen QIAN,Meng TIAN,Xue JIANG,Hua-ju SONG,Feng SHU,Jun LI

《信息与电子工程前沿（英文）》 2015年第16卷第10期页码 892-898 doi: 10.1631/FITEE.1500135

摘要： In this paper, we investigate a two-way relaying power line communication (PLC) network with analog network coding. We focus on the analysis of the system outage probability, symbol error rate, and average capacity. Specifically, we first derive the probability density function (PDF) of the received signal-to-noise ratio (SNR) with a closed form, by exploiting the statistical properties of the PLC channel. Then with the help of this PDF, we develop the outage probability, symbol error rate, and average capacity with closed forms, based on the Hermite polynomial. Simulations show that the derived analytical results are consistent with those by Monte Carlo simulation.

关键词： Power line communication Outage probability Symbol error rate Signal attenuation

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双向4D打印——对3D打印形状记忆材料可逆性的回顾

Amelia Yilin Lee, Jia An, Chee Kai Chua

《工程（英文）》 2017年第3卷第5期页码 663-674 doi: 10.1016/J.ENG.2017.05.014

摘要：

增材制造技术的快速发展和形状记忆材料的进步推动了四维（4D）打印的发展。由于一定程度上的外部刺激，人机交互作用、传感器和电池的需求将被消除，通过使用增材制造技术，可以生产出更复杂的设备和零部件。随着目前对形状记忆机制的理解和对增材制造技术的改进设计，4D 打印的可逆性已经被证明是可行的。传统的单向4D 打印需要在编程（或定型）阶段进行人机交互，但是可逆的4D 打印或双向4D 打印将完全消除对人为干预的需求，因为编程阶段被另一种外界刺激所取代。这使得可逆4D 打印部件完全依赖外部刺激。零部件在每次回收后都可能被重复利用，甚至在某个周期中可以持续使用——这是一个具有工业运用吸引力的方面。本文综述了影响4D 打印的形状记忆材料的机制，目前在合金和聚合物上的4D 打印研究结果，以及它们各自存在的一些局限性。对形状记忆材料的可逆性和利用三维（3D）打印技术制作的可行性进行了总结和分析。在对可逆4D 打印技术相关内容的介绍中，本文也强调了3D 打印技术的方法、相关驱动的机制以及实现可逆性的策略。最后，提出了可逆4D 打印技术未来的研究方向。

关键词： 4D打印增材制造形状记忆材料智能材料形状记忆合金形状记忆聚合物

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对双层组件4D打印可逆性的初步研究 Article

Amelia Yilin Lee, Jia An, Chee Kai Chu, Yi Zhang

《工程（英文）》 2019年第5卷第6期页码 1159-1170 doi: 10.1016/j.eng.2019.09.007

摘要：

增材制造的快速发展和形状记忆聚合物材料的进步推动了四维（4D）打印技术的进展。随着设计方面的不断改进，逐渐证明有可能实现可逆4D打印或双向4D打印。这项技术将完全消除对人为干预的需要，因为编程完全由外部刺激驱动，这使得4D打印部件可以在多个周期内启动。本研究提出了一种新的可逆4D打印驱动方法，其中弹性体的溶胀和热量用于编程阶段，以及热量用于恢复阶段。本研究的主要重点在于自驱动设计这一步骤。为了实现对弯曲的控制，已经开发了一种简单的预测模型用于研究曲率。此外，为了更好地了解模型对曲率的预测程度，对参数、温度和弹性体厚度也进行了研究。采用这种方式理解曲率可以提供对可逆4D打印结构的高度控制。

关键词： 4D打印增材制造形状记忆聚合物可逆4D打印双向4D打印溶胀弹性体

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Multi-scale evaluation of river health in Liao River Basin, China

Fei XU, Yanwei ZHAO, Zhifeng YANG, Yuan ZHANG

《环境科学与工程前沿（英文）》 2011年第5卷第2期页码 227-235 doi: 10.1007/s11783-010-0219-9

摘要： Previous studies on river health evaluation mainly focused on characterizations at a river-corridor scale and ignored the complex interactions between the river ecosystem and other components of the river basin. Based on the consideration of the interactions among rivers, associated river basin and habitats, an assessment framework with multi-scale indicators was developed. An index system divided among these three scales to characterize the health of river ecosystems in China’s Liao River Basin was established. Set pair analysis was applied to integrate the multi-scale indicators and determine the health classes. The evaluation results indicated that the rivers in the western and eastern zones of the Liao River were classified as sick, and rivers in the main stream of the Liao and Huntai rivers were classified as unhealthy. An excessive level of disturbances, such as large pollution loads and dense construction of water conservation projects within the river basin, were the main causes of the river health deterioration.

关键词： multi-scale characterization river health evaluation Liao River Basin set pair analysis

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Operating mechanism and set pair analysis model of a sustainable water resources system

Chaoyang DU,Jingjie YU,Huaping ZHONG,Dandan WANG

《环境科学与工程前沿（英文）》 2015年第9卷第2期页码 288-297 doi: 10.1007/s11783-014-0642-4

摘要： There is no alternative to the world’s water resources, and their increasing scarcity is making it difficult to meet the world population’s water needs. This paper presents a sustainable water resources system (SWRS) and analyzes the operating mechanism that makes it possible to evaluate the status of such a system. A SWRS can be described as a complex coupling system that integrates water resources, social, economic and ecological systems into a whole. The SWRS’s operating mechanism is composed of dynamic, resistance and coordination components, and it interacts with and controls the system’s evolution process. The study introduces a new approach, set pair analysis theory, to measure the state of a SWRS, and an evaluation index system is established using the subsystems and operating mechanism of a SWRS. The evaluation index system is separated into three levels (goal level, criteria level and index level) and divides the index standard into five grades. An evaluation model of the SWRS based on set pair analysis theory is constructed, and an example of SWRS evaluation in Shanghai is presented. The connection degrees of the index in the three levels are calculated, and the connection degree of the goal index is calculated to be 0.342, which classifies the city’s SWRS condition as grade 2. The sustainable use of water resources in the region is determined to be at a relatively adequate level that meets the requirements of sustainable development.

关键词： sustainable water resources system operating mechanism set pair analysis model Shanghai

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大规模天线多入多出认知无线网络中的多用户传输速率和能量分析 None

Shang LIU, Ishtiaq AHMAD, Ping ZHANG, Zhi ZHANG

《信息与电子工程前沿（英文）》 2018年第19卷第5期页码 674-684 doi: 10.1631/FITEE.1700081

摘要：讨论了在包含中继和大规模多入多出天线下的认知无线网络传输性能和能量分配问题。首先得到了在不考虑认知情况下的中继辅助大规模天线网络的下行传输性能，运用功率分配准则，第k个用户的渐近信干噪比与快衰落无关，当基站天线数和中继天线数的比值趋于无穷大时，整个传输过程的传输性能只与从中继到用户侧的传输有关，而与另外一侧的传输无关。接着给出了在完美和非完美信道情况下的认知大规模多入多出天线中继网络性能的闭式表达式。当主用户基站、次级用户基站、中继基站的天线数目趋于无穷大时，传输性能与快衰落无关，主、次网络之间的干扰能被完全消除，次级网络传输性能与干扰温度无关，次级网络可用峰值功率进行传输而不对主用户网络产生干扰。定义了主用户网络的效用函数，通过凸优化分析得到最佳中继发射功率。系统仿真验证了该结论。通过仿真，得到了系统传输速率与天线数目、中继功率、天线数目比值的关系。在多用户认知无线网络中，运用大规模多入多出天线的线性预编码方式能够极大减少干扰，提高传输效率，主用户网络和次级用户网络可以独立传输。

关键词：大规模多入多出；认知无线电；中继网络；传输速率；功率分析

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Scaled boundary finite element method with exact defining curves for two-dimensional linear multi-field

Jaroon RUNGAMORNRAT, Chung Nguyen VAN

《结构与土木工程前沿（英文）》 2019年第13卷第1期页码 201-214 doi: 10.1007/s11709-018-0488-0

摘要： This paper presents an efficient and accurate numerical technique based upon the scaled boundary finite element method for the analysis of two-dimensional, linear, second-order, boundary value problems with a domain completely described by a circular defining curve. The scaled boundary finite element formulation is established in a general framework allowing single-field and multi-field problems, bounded and unbounded bodies, distributed body source, and general boundary conditions to be treated in a unified fashion. The conventional polar coordinates together with a properly selected scaling center are utilized to achieve the exact description of the circular defining curve, exact geometry of the domain, and exact spatial differential operators. Standard finite element shape functions are employed in the discretization of both trial and test functions in the circumferential direction and the resulting eigenproblem is solved by a selected efficient algorithm. The computational performance of the implemented procedure is then fully investigated for various scenarios to demonstrate the accuracy in comparison with standard linear elements.

关键词： multi-field problems defining curve exact geometry general boundary conditions SBFEM

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Solar photocatalytic decomposition of two azo dyes on multi-walled carbon nanotubes (MWCNTs)/TiO 2 composites

Huilong WANG, Shuqin LIU, Hui WANG, Wenfeng JIANG,

《环境科学与工程前沿（英文）》 2010年第4卷第3期页码 311-320 doi: 10.1007/s11783-010-0237-7

摘要： Multi-walled carbon nanotubes (MWCNTs)/TiO composite photocatalysts with high photoactivity were prepared by sol-gel process and further characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), and UV-vis absorption spectra. Compared to pure TiO, the combination of MWCNTs with titania could cause a significant absorption shift toward the visible region. The photocatalytic performances of the MWCNTs/TiO composite catalysts were evaluated for the decomposition of Reactive light yellow K-6G (K-6G) and Mordant black 7 (MB 7) azo dyes solution under solar light irradiation. The results showed that the addition of MWCNTs enhanced the adsorption and photocatalytic activity of TiO for the degradation of azo dyes K-6G and MB 7. The effect of MWCNTs content, catalyst dosage, pH, and initial dye concentration were examined as operational parameters. The kinetics of photocatalytic degradation of two dyes was found to follow a pseudo-first-order rate law. The photocatalyst was used for seven cycles with photocatalytic degradation efficiency still higher than 98%. A plausible mechanism is also proposed and discussed on the basis of experimental results.

关键词： sol-gel multi-walled carbon nanotubes (MWCNTs)/TiO2 composite photocatalysis azo dye solar irradiation

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Efficient detection methods for amplify-and-forward relay-aided device-to-device systems with full-rate Article

Kang-li ZHANG, Cong ZHANG, Fang-lin GU, Jian WANG

《信息与电子工程前沿（英文）》 2017年第18卷第6期页码 788-795 doi: 10.1631/FITEE.1700018

摘要：中继辅助设备到设备通信是下一代蜂窝网络中一项极具潜力的技术。研究了适用于配置多天线的放大转发中继辅助设备到设备通信系统的不同传输方案。为了解决基于全速率空时块码传输方案的传统最大似然检测算法复杂度高的问题，文中提出两种低复杂度检测方法，分别为采用最大似然合并算法的检测方法和采用联合条件最大似然检测器的检测方法。特别是，所提的基于联合条件最大似然检测器的检测方法，能够通过牺牲一定的存储空间换取较好的并行处理能力。仿真结果表明：针对采用全速率空时块码传输方案提出的两种检测方法，能够获得与传统最大似然检测方法近乎相同的误符号率，但所提检测方法复杂度更低；同时，采用基于全速率空时块码的传输方案比复用传输方案具有更优的误码性能。仿真结果还进一步验证了对所提检测方法的分集增益分析。

关键词：设备到设备通信；中继；检测；全速率空时块码

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有固相析出的多效两段蒸发系统模型与过程模拟

李玲,阮奇

《中国工程科学》 2008年第10卷第10期页码 54-60

摘要：

建立了带有冷凝水闪蒸的有固相析出的多效两段蒸发系统的常规设计数学模型，模型将系统的相平衡关系用回归式表达，使模型可以用计算机编程求解，避免了手工计算结合查相图的烦琐的计算过程；利用矩阵方程具有结构清晰和高度模块化的特点，将系统的物料衡算和热量衡算方程组写成矩阵方程的形式，只要保留或舍弃矩阵方程中的相关块矩阵，模型就能代表没有冷凝水闪蒸或没有固相析出的多效两段蒸发系统常规设计模型；采用迭代法结合矩阵法来求解模型，算例表明，冷凝水闪蒸对多效两段蒸发系统是有效的节能措施，算法收敛速度快、收敛稳定性好。

关键词：固相析出多效两段蒸发数学模型冷凝水闪蒸

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Liquid metal printing opening the way for energy conservation in semiconductor manufacturing industry

《能源前沿（英文）》 2022年第16卷第4期页码 542-547 doi: 10.1007/s11708-022-0834-8

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New method for computer numerical control machine tool calibration: Relay method

LIU Huanlao, SHI Hanming, LI Bin, ZHOU Huichen

《机械工程前沿（英文）》 2007年第2卷第3期页码 301-304 doi: 10.1007/s11465-007-0053-3

摘要： Relay measurement method, which uses the kilogram-meter (KGM) measurement system to identify volumetric errors on the planes of computer numerical control (CNC) machine tools, is verified through experimental tests. During the process, all position errors on the entire plane table are measured by the equipment, which is limited to a small field. All errors are obtained first by measuring the error of the basic position near the original point. On the basis of that positional error, the positional errors far away from the original point are measured. Using this analogy, the error information on the positional points on the entire plane can be obtained. The process outlined above is called the relay method. Test results indicate that the accuracy and repeatability are high, and the method can be used to calibrate geometric errors on the plane of CNC machine tools after backlash errors have been well compensated.

关键词： positional volumetric information process repeatability