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Supplier selection and order splitting in multiple-sourcing inventory systems

WANG Guicong, JIANG Zhaoliang, LI Zhaoqian, LIU Wenping

《机械工程前沿（英文）》 2008年第3卷第1期页码 23-27 doi: 10.1007/s11465-008-0016-3

摘要： Supplier selection and inventory control are critical decision processes in single-item multiple-supplier systems. An integer linear programming model is proposed to help managers determine the reorder level, choose the best suppliers, and place the optimum order quantities so that the total average inventory cost is minimum, and constraints of supplier ability, quality, and demand are considered. An algorithm combining the branch-bound algorithm and enumeration algorithm is developed to solve the problems. Application of the proposed model in an automobile industry shows that it is effective.

关键词： automobile industry branch-bound algorithm selection single-item multiple-supplier effective

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Design and analysis of partially decoupled translational parallel mechanisms with single-loop structures

《机械工程前沿（英文）》 2022年第17卷第3期 doi: 10.1007/s11465-022-0695-1

摘要： This study presents a family of novel translational parallel mechanisms (TPMs) with single-loop topological structures. The proposed mechanism consists of only revolute and prismatic joints. The novel TPMs are simpler in structure and have fewer joints and components than the well-known Delta Robot. Four types of 2-degree of freedom driving systems are applied to different limb structures to avoid the moving actuator that causes the problem of increased moving mass. Four sample TPMs are constructed using the synthesized limbs, and one of them is investigated in terms of kinematic performance. First, a position analysis is performed and validated through numerical simulation to reveal the characteristics of partially decoupled motion, which improves the controllability of TPM. Second, singular configurations are identified, and the resulting singularity curve is obtained. Lastly, the workspace of TPM is analyzed, and the relationship between the singular configurations and the reachable workspace is explored. The workspace of the 3-CRR (C denotes the cylindrical joint and R denotes the revolute joint) translational mechanism is also presented to prove that the proposed TPM has a fairly large workspace.

关键词： translational parallel mechanism single loop multiple driving system workspace analysis singularity

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Multiple damage detection in complex bridges based on strain energy extracted from single point measurement

Alireza ARABHA NAJAFABADI, Farhad DANESHJOO, Hamid Reza AHMADI

《结构与土木工程前沿（英文）》 2020年第14卷第3期页码 722-730 doi: 10.1007/s11709-020-0624-5

摘要： Strain Energy of the structure can be changed with the damage at the damage location. The accurate detection of the damage location using this index in a force system is dependent on the degree of accuracy in determining the structure deformation function before and after damage. The use of modal-based methods to identify damage in complex bridges is always associated with problems due to the need to consider the effects of higher modes and the adverse effect of operational conditions on the extraction of structural modal parameters. In this paper, the deformation of the structure was determined by the concept of influence line using the Betti-Maxwell theory. Then two damage detection indicators were developed based on strain energy variations. These indices were presented separately for bending and torsion changes. Finite element analysis of a five-span concrete curved bridge was done to validate the stated methods. Damage was simulated by decreasing stiffness at different sections of the deck. The response regarding displacement of a point on the deck was measured along each span by passing a moving load on the bridge at very low speeds. Indicators of the strain energy extracted from displacement influence line and the strain energy extracted from the rotational displacement influence line (SERIL) were calculated for the studied bridge. The results show that the proposed methods have well identified the location of the damage by significantly reducing the number of sensors required to record the response. Also, the location of symmetric damages is detected with high resolution using SERIL.

关键词： damage detection strain energy influence line complex bridges rotation displacement

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合同管理是项目管理的核心——小浪底水利枢纽国际合同管理的经验与体会

张基尧

《中国工程科学》 2011年第13卷第4期页码 54-67

摘要：

小浪底水利枢纽是治理黄河的重要控制性工程，它以地质复杂、布置困难、技术要求高、管理难度大而得到我国水利水电行业的普遍关注，尤其是由于其全方位实施国际招标，成为我国水利工程第一个全面与国际接轨的项目。小浪底水利枢纽至今已建成并成功运行10年，发挥了巨大的社会、经济和生态效益。小浪底工程建设中三大国际承包联营体隶属的40多个国家和地区的承包商、分包商，与项目业主之间围绕合同管理，呈现出多方利益主体之间的博弈。小浪底建管局依靠各方支持，在团结全体建设者优质高效地建成小浪底工程的同时，妥善处理纷繁复杂的各种合同纠

关键词：项目管理合同管理小浪底水利枢纽

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Supplier development and its incentives in infrastructure mega-projects: A case study on Hong Kong-Zhuhai-Macao

Wei ZENG, Jinwen ZHANG, Hongwei WANG, Hongtao ZHOU

《工程管理前沿（英文）》 2018年第5卷第1期页码 88-97 doi: 10.15302/J-FEM-2018077

摘要： In this paper the Hong Kong-Zhuhai-Macao Bridge project is taken as a case to analyze supplier development in infrastructure mega-projects. Compared with manufacturing industry, the characteristics of supplier development in infrastructure mega-projects is analyzed in term of development motives, supplier selection, quality management, production mode, owner participation and risks. The critical factors influencing the construction supplier development are identified, which include incentives, collaboration, future market, trust and bilateral communication. Furthermore, focusing on the incentives for the supplier’s product quality and production capacity improvement, decision-making framework models are proposed to design the incentive mechanisms.

关键词： infrastructure mega-project supplier development critical success factors incentives case study

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基于元胞自动机的电阻存储器多比特固定型故障诊断 Research Article

Sutapa SARKAR1, Biplab Kumar SIKDAR2, Mousumi SAHA3

《信息与电子工程前沿（英文）》 2022年第23卷第7期页码 1110-1126 doi: 10.1631/FITEE.2100255

摘要：本文提出一种用于可变电阻式存储器（ReRAM）、基于组的动态固定型故障诊断方案。传统的静态随机存取存储器、动态随机存取存储器、NAND和NOR闪存受可扩展性、功率、封装密度等限制。可变电阻式存储器这类下一代存储器被认为具有多种优势，如高封装密度、非易失性、可扩展性和低功耗，但单元可靠性一直是个问题。不可靠的内存操作是由于大量使用写入或内存密集型工作负载而导致的永久性固定型故障。越来越多的固定型故障也限制了芯片寿命。因此，本文提出一种基于元胞自动机（CA）的动态消除固定型故障设计，以解决不可靠的电池功能和不稳定的电池寿命问题。引入可扩展的块级故障诊断和恢复方案，以确保在出现多比特固定型故障情形下仍可读取数据。该方案是一种新颖方法，因其目标是消除一般故障条件下对固定型故障的数量和性质的限制。所提方案基于Wolfram零边界和周期性边界CA理论。引入多种特殊类别CA——单长循环单吸引子元胞自动机（SACA）、单长循环双吸引子元胞自动机（TACA）和单长循环多吸引子元胞自动机（MACA）——以实现完全容错。目标微架构单元设计具有最佳空间开销。

关键词：电阻存储器；电池可靠性；块级故障诊断；单长循环单吸引子元胞自动机；单长循环双吸引子元胞自动机；单长循环多吸引子元胞自动机

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大中型水利工程建设管理的实践和体会

张基尧

《中国工程科学》 2011年第13卷第8期页码 22-25

摘要：水利工程建设是基础设施建设的重要组成部分。加强水利工程建设管理是提高水利投资效益和社会、经济、生态效益的重要途经，是工程管理科学研究的重要内容。文章主要阐述了不同阶段大中型水利工程建设管理的责任主体、管理重点、有效做法和成功案例。

关键词：大中型水利工程；项目管理；实践体会

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An assessment of surrogate fuel using Bayesian multiple kernel learning model in sight of sooting tendency

《能源前沿（英文）》 2022年第16卷第2期页码 277-291 doi: 10.1007/s11708-021-0731-6

摘要： An integrated and systematic database of sooting tendency with more than 190 kinds of fuels was obtained through a series of experimental investigations. The laser-induced incandescence (LII) method was used to acquire the 2D distribution of soot volume fraction, and an apparatus-independent yield sooting index (YSI) was experimentally obtained. Based on the database, a novel predicting model of YSI values for surrogate fuels was proposed with the application of a machine learning method, named the Bayesian multiple kernel learning (BMKL) model. A high correlation coefficient (0.986) between measured YSIs and predicted values with the BMKL model was obtained, indicating that the BMKL model had a reliable and accurate predictive capacity for YSI values of surrogate fuels. The BMKL model provides an accurate and low-cost approach to assess surrogate performances of diesel, jet fuel, and biodiesel in terms of sooting tendency. Particularly, this model is one of the first attempts to predict the sooting tendencies of surrogate fuels that concurrently contain hydrocarbon and oxygenated components and shows a satisfying matching level. During surrogate formulation, the BMKL model can be used to shrink the surrogate candidate list in terms of sooting tendency and ensure the optimal surrogate has a satisfying matching level of soot behaviors. Due to the high accuracy and resolution of YSI prediction, the BMKL model is also capable of providing distinguishing information of sooting tendency for surrogate design.

关键词： sooting tendency yield sooting index Bayesian multiple kernel learning surrogate assessment surrogate formulation

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存在信道状态估计误差的最大比合并/选择合并分集技术在单输入多输出窃密系统中的遍历保密容量分析 Article

Hui ZHAO, You-yu TAN, Gao-feng PAN, Yun-fei CHEN

《信息与电子工程前沿（英文）》 2017年第18卷第4期页码 578-590 doi: 10.1631/FITEE.1500430

摘要：在物理层中，本文研究了存在信道估计误差的最大比合并/选择合并的保密容量性能。在一个单输入多输出窃密信道中，信源向一个装备M根接收天线并采用最大比合并/选择合并技术处理多径信号的信宿发送保密信息。与此同时，一个窃密者装备N根接收天线并采用最大比合并/选择合并技术来提高窃密的成功率。我们分别推导了两种情况下遍历保密容量的精确和近似闭式表达式：（1）最大比合并带有信道估计误差；（2）选择合并带有信道延迟。此外，本文得到了高信噪比斜率和高信噪比功率补偿两个重要的参数，它们在高信噪比条件下决定了遍历保密容量。最后，本文通过仿真分析验证了所得到的闭式表达式的准确性。

关键词：遍历保密容量，最大比合并，加权误差，物理层保密，选择合并，单输入多输出

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利用超表面协同调制电磁波与数字信号以实现可编程无线通信 Article

万向, 肖朝昆, 黄鹤, 肖强, 许威, Yueheng Li, Joerg Eisenbeis, 王嘉伟, 黄梓艾, 程强, 金石, Thomas Zwick, 崔铁军

《工程（英文）》 2022年第8卷第1期页码 86-95 doi: 10.1016/j.eng.2021.07.016

摘要：

在当前的无线电子信息系统中，数字信号和电磁辐射一般由不同的模块进行处理。本文基于可编程超表面提出了一种将数字信号调制与电磁辐射调控相融合的工作机制。可编程超表面包含大量亚波长尺度的数字编码单元，这些单元的数字状态构成了基于可编程超表面的信号调制与波束控制的口面编码序列。通过妥善设计空域和时域口面编码序列，可按指定方式同时对数字信号和远场方向图进行调控。为了实验验证该工作机制，我们提出了一种可编程无线通信系统。该系统可以产生指定方向的单个波束形成单通道信号传输，也可以产生指定的双波束形成双通道独立信号传输。实验结果很好地验证了可编程通信系统的各项功能。本文的研究成果在第五代/第六代（5G/6G）无线通信中以及无人机、自动驾驶等现代智能电子平台中具有重要的应用前景。

关键词：雷达与通信一体化可编程超表面大规模多输入多输出

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Crystallographic orientation effect on cutting-based single atomic layer removal

Wenkun XIE, Fengzhou FANG

《机械工程前沿（英文）》 2020年第15卷第4期页码 631-644 doi: 10.1007/s11465-020-0599-x

摘要： The ever-increasing requirements for the scalable manufacturing of atomic-scale devices emphasize the significance of developing atomic-scale manufacturing technology. The mechanism of a single atomic layer removal in cutting is the key basic theoretical foundation for atomic-scale mechanical cutting. Material anisotropy is among the key decisive factors that could not be neglected in cutting at such a scale. In the present study, the crystallographic orientation effect on the cutting-based single atomic layer removal of monocrystalline copper is investigated by molecular dynamics simulation. When undeformed chip thickness is in the atomic scale, two kinds of single atomic layer removal mechanisms exist in cutting-based single atomic layer removal, namely, dislocation motion and extrusion, due to the differing atomic structures on different crystallographic planes. On close-packed crystallographic plane, the material removal is dominated by the shear stress-driven dislocation motion, whereas on non-close packed crystallographic planes, extrusion-dominated material removal dominates. To obtain an atomic, defect-free processed surface, the cutting needs to be conducted on the close-packed crystallographic planes of monocrystalline copper.

关键词： ACSM single atomic layer removal mechanism crystallographic orientation effect mechanical cutting Manufacturing III

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Analysis of the treatment outcomes of esophageal variceal bleeding patients from multiple centers in

WANG Zhiqiang

《医学前沿（英文）》 2008年第2卷第2期页码 171-173 doi: 10.1007/s11684-008-0031-0

摘要： This study aimed to investigate the treatment outcomes of esophageal variceal bleeding (EVB) in China. A total of 1087 cases were collected from 19 hospitals in 16 large and medium sized cities across China between January 1st, 2005 and January 1st, 2006. There were 313 cases (29.0%) of mild (<400 mL), 494 cases (45.8%) of moderate (400–1500 mL) and 272 cases (25.2%) of severe (>1500 mL) bleeding. Successful hemostasis was achieved in 89.8% of cases. Seven hundred and eighty-five cases were treated by medication with a hemostasis rate of 91.8%. Seventy-one cases were treated using a Sengstaken-Blakemore tube with a hemostasis rate of 54.9%. Thirty-seven cases were treated with emergency endoscopic variceal ligation with a hemostasis rate of 83.8%. Seventy-seven cases were treated with endoscopic sclerotherapy with a hemostasis rate of 94.8%. Forty-three cases were treated with emergency surgical operation with a hemostasis rate of 95.3%. Sixty-six cases were treated with combined therapy with a hemostasis rate of 97.0%. There was a significant difference ( < 0.01) in the successful hemostasis rate between different treatments. The overall mortality was 10.1%, among which 6.6% was directly caused by bleeding. The multivariate logistic regression analysis shows that the severity of bleeding, treatment methods, liver dysfunction and activation of hepatitis were predictive factors for successful hemostasis. Most cases of EVB were mild and moderate in severity. The first-line treatment for EVB is medication. Emergency endoscopic intervention has not been widely available yet. The overall management outcome of EVB has been improved.

关键词： significant difference predictive medication first-line treatment bleeding

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Moving policy and regulation forward for single-use plastic alternatives

《环境科学与工程前沿（英文）》 2021年第15卷第3期 doi: 10.1007/s11783-021-1423-5

摘要： Single-use plastics are often used once or cannot be reused for extended periods. They are widely consumed with the rapid development of social economy. The waste generated by single-use plastics threatens ecosystem health by entering the environment and ultimately restricts sustainable human development. The innovation of sustainable and environmentally friendly single-use plastic alternative materials and the joint participation of governments, enterprises and the public are promising technologies and management approaches that can solve the problem of single-use plastics wastes. The development of single-use plastic alternative products can be promoted fundamentally only by improving relevant legislation and standards, providing differentiated industrial policies, encouraging scientific and technological innovation and expanding public participation.

关键词： Single-use plastic alternatives Policy Regulation Sustainable development

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多天线非正交多址接入技术：综述 Regular Papers

Fei-yan TIAN, Xiao-ming CHEN

《信息与电子工程前沿（英文）》 2019年第20卷第12期页码 1665-1697 doi: 10.1631/FITEE.1900405

摘要：作为一种前沿的物理层技术，非正交多址接入技术允许多用户共享同一时空资源，因此增加了可接入用户数量，从而改善频谱效率。在第5代及未来无线通信网络中，非正交多址接入技术为实现大规模万物互联提供了可行方案。然而，严重的共道干扰和较高的实施复杂度阻碍了其在实际系统中的应用。为解决这些问题，多天线技术凭借其在空间自由度上的优势，已被广泛应用于非正交多址接入系统。本文针对多天线技术在非正交多址接入系统中各种各样的应用提供了一个全面综述，主要强调其在消除空间干扰和降低实施复杂度上的优势。特别地，详细调查了多天线技术在两用户、多用户、大规模连接和异构非正交多址接入系统中的应用。最后，预测了未来相关研究方向与挑战。

关键词：非正交多址接入；多天线技术；B5G；物联网

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Sequential degradation-based burn-in test with multiple periodic inspections

《工程管理前沿（英文）》 2021年第8卷第4期页码 519-530 doi: 10.1007/s42524-021-0166-0

摘要： Burn-in has been proven effective in identifying and removing defective products before they are delivered to customers. Most existing burn-in models adopt a one-shot scheme, which may not be sufficient enough for identification. Borrowing the idea from sequential inspections for remaining useful life prediction and accelerated lifetime test, this study proposes a sequential degradation-based burn-in model with multiple periodic inspections. At each inspection epoch, the posterior probability that a product belongs to a normal one is updated with the inspected degradation level. Based on the degradation level and the updated posterior probability, a product can be disposed, put into field use, or kept in the test till the next inspection epoch. We cast the problem into a partially observed Markov decision process to minimize the expected total burn-in cost of a product, and derive some interesting structures of the optimal policy. Then, algorithms are provided to find the joint optimal inspection period and number of inspections in steps. A numerical study is also provided to illustrate the effectiveness of our proposed model.

关键词： burn-in degradation multiple inspections Wiener process partially observed Markov decision process