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Recovery of coupled networks after cascading failures

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Journal of Systems Engineering and Electronics 2018年第3期29卷 650-657页

作者： GAO jiazi YIN Yongfeng FIONDELLA Lance LIU Lijun School of Reliability and Systems Engineering Beihang University Department of Electrical & Computer Engineering University of Massachusetts

With society＇s increasing dependence on critical infrastructure such as power grids and communications systems, the robustness of these systems has attracted significant *** of some nodes can trigger a cascading failure, which completely fragments the network, necessitating recovery efforts to improve robustness of complex systems. Inspired by real-world scenarios, this paper proposes repair models after two kinds of network failures, namely complete and incomplete collapse. In both models, three kinds of repair strategies are possible, including random selection（RS）, node selection based on single network node degree（SD）, and node selection based on double network node degree（DD）. We find that the node correlation in each of the two coupled networks affects repair efficiency. Numerical simulation and analysis results suggest that the repair node ratio and repair strategies may have a significant impact on the economics of the repair process. The results of this study thus provide insight into ways to improve the robustness of coupled networks after cascading failures.

关键词： networks reliability interdependent networks recovery strategy cascading failure

基于提升用户体验的微信小程序设计策略研究——以“毕业留念”为例

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包装工程 2025年第2期46卷 457-461页

作者：澹台嘉孜太原工业学院太原030000

目的通过了解微信小程序的发展现状和功能特点,探究微信小程序设计的可行性策略。方法通过采用文献资料法、访谈法、案例说明法,简要分析微信小程序的发展现状与特征,探究小程序的交互设计策略,并以“毕业留念”小程序设计为案例,对... 详细信息

目的通过了解微信小程序的发展现状和功能特点,探究微信小程序设计的可行性策略。方法通过采用文献资料法、访谈法、案例说明法,简要分析微信小程序的发展现状与特征,探究小程序的交互设计策略,并以“毕业留念”小程序设计为案例,对小程序交互设计进行探究。结论经过基于提升用户体验的微信小程序设计策略研究,最终明确在设计与策划微信小程序的过程中,设计人员既要充分了解公众对产品的基础服务诉求,又要从用户需求的角度挖掘微信小程序设计存在的短板,并始终以简化任务交互流程、强化感官与情感体验为中心,对产品的功能和作用性进行不断优化,由此方可体现产品功能和细节的联动给用户体验带来的优越性。

关键词：交互设计微信小程序用户体验 “毕业留念”

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Method for prevention and control of spontaneous combustion of coal seam and its application in mining field

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International Journal of Mining Science and Technology 2017年第5期27卷 839-846页

作者： Wei Lu Ying-jiazi Cao Jerry C.Tien College of Mining and Safety Engineering Shandong University of Science & Technology Department of Civil Engineering Monash University

Spontaneous combustion of coal seam has been and continues to be a big problem in coal mines. It could pose great threat to the safety of the whole mine and all miners, especially when it occurs in or nearby coal mines. Besides, environment of area surrounded mines during combustion can be threatened where large amount of toxic gases including CO_2, CO, SO_2 and H_2S can be leased by fire in mine. Hence, it is important and significant for scholars to study the controlling and preventing of the coal seam fire. In this paper, the complicated reasons for the occurrence and development of spontaneous combustion in coal seam are analysed and different models under various air leakage situations are built as well. Based on the model and approximately calculation, the difficulty of fire extinguishment in coal seam is pointed out as the difficulty and poor effect to remove the large amount of heat released. Detailed measurements about backfilling and case analyses are also provided on the basis of the recent ten years' practice of controlling spontaneous combustion in coal seams in china. A technical fire prevention and control method has been concluded as five steps including detection, prevention, sealing, injection and pressure adjustment. However, various backfill materials require different application and environmental factors, so in this paper, analyses and discussion about the effect and engineering application of prevention of spontaneous combustion are provided according to different backfilling technologies and methods. Once the aforementioned fire prevention can be widely applied and regulated in mines, green mining will be achievable concerning mine fire prevention and control.

关键词： Spontaneous combustion of coal Prevention and control Pressure adjustment Mining field

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基于多层次结构建模的药物相互作用类型预测

中国科学:信息科学 2025年第2期55卷 356-371页

作者：吴怀瑾卜家梓杨念祖孙垚宋海涛柳宁严骏驰上海交通大学人工智能教育部重点实验室上海200240 之江实验室杭州311121 上海人工智能研究院上海200240 上海交通大学人工智能学院上海200240

药物相互作用(drug-drug interactions,DDIs)通常在多种药物共同使用时发生.某些药物之间的相互作用可以带来积极的治疗效果,而某些药物相互作用引起的反应可能会带来严重的影响,甚至危及生命,这使得预测某两种药物之间是否存在相互作... 详细信息

药物相互作用(drug-drug interactions,DDIs)通常在多种药物共同使用时发生.某些药物之间的相互作用可以带来积极的治疗效果,而某些药物相互作用引起的反应可能会带来严重的影响,甚至危及生命,这使得预测某两种药物之间是否存在相互作用乃至何种类型变得至关重要.而实验研究DDIs的需求和成本不断增长,凸显了采用计算方法,尤其是机器学习方法以预测DDIs的价值.然而,此前基于机器学习的方法均未能全面建模DDIs问题中包括药物自身分子子结构、全结构和药物相互作用网络结构在内的3个层级信息,部分方法还依赖于大规模生物知识图谱,增加了模型的推理成本.本文提出HierDDI,它仅通过数据集中的DDIs即能构建一个多层次图结构,而无需依赖附加知识图谱.更具体地说,HierDDI通过建模药物自身分子子结构、全结构、药物相互作用网络结构这3个层面,来预测药物相互作用.由此不仅捕获了药物自身的结构信息,还将药物间的相互作用考虑在内,并通过端到端的训练,建立模型对DDIs的全面理解.本文所有模块的设计都非常简洁,广泛的实验展示了本文提出的方法明显优于目前药物相互作用领域的领先方法,成为目前表现最佳的模型.在DrugBank和Twosides等公开数据集上,本文提出的方法在直推式(transductive)场景中的准确率比当前领先方法提高了0.58%和2.02%,而在归纳式(inductive)场景中则更是提高了4.20%和3.52%.源代码发布在https://***/wuhuaijin/HierDDI.

关键词：机器学习药物相互作用多层次图神经网络端到端

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Formation mechanism of Fe-based amorphous powders produced by spark erosion

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Journal of Materials Science & Technology 2024年第3期170卷 33-46页

作者： Chekai Liu Ran Li jiazi Bi Ding Ma Xiaobin Liu Tao Zhang School of Materials Science and Engineering Key Laboratory of Aerospace Materials and Performance(Ministry of Education)Beihang UniversityBeijing 100191China

Spark erosion is a convenient,flexible,and low-cost method to quickly produce fine powders of metals,alloys,and semiconductors in size ranging from nearly a hundred micrometers to submicrometer by repetitive spark *** to the complexity of the powder-forming journey,normally accompanied by high temperature,high pressure,decomposition,diffusion and rapid quenching caused by discharge plasma,the mechanisms of powder formation and possible contaminant infiltration are still controversial,posing a significant challenge to control particle size and chemical composition of the powder produced by this *** this study,Fe-based amorphous powders in different particle-size distributions with high sphericity were fabricated by spark erosion under different discharge-energy *** max-imum particle size of the resultant powders can be correlated with discharge parameters,crater depth,and crater radius,respectively.A multi-ring-breakup model is proposed to reveal the particle-size distribution of the powder formed from the electrode melt under a single-pulse ***,a dielectric-element infiltration model is provided to quantitatively evaluate the infiltration mass ratio of the contaminant elements,stemming from the decomposed products of dielectric liquid,in the resultant powder with different particle *** models verified through the experimental data are significant for the development of high-performance fine Fe-based amorphous powder with controlled particle size and chemical composition.

关键词： Amorphous alloy Particle Spark erosion Infiltration Modeling

Tissue level microstructure and mechanical properties of the femoral head in the proximal femur of fracture patients

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Acta Mechanica Sinica 2015年第2期31卷 259-267页

作者： Linwei Lü Guangwei Meng He Gong Dong Zhu jiazi Gao Yubo Fan School of Mechanical Engineering Tianjin University of Technology Department of Engineering Mechanics Jilin University Department of Orthopaedic Surgery No.1 Hospital of Jilin University Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education School of Biological Science and Medical EngineeringBeihang University

This study aims to investigate the regional variations of trabecular morphological parameters and mechanical parameters of the femoral head,as well as to determine the relationship between trabecular morphological and mechanical *** femoral heads from patients with fractured proximal femur were scanned using a micro-CT *** femoral head was divided into 12 sub-regions according to the trabecular *** 125 mm^3 trabecular cubic model was reconstructed from each sub-region.A total of 81 trabecular models were reconstructed,except three destroyed sub-regions from two femoral heads during the *** morphological parameters,*** separation（***）,trabecular thickness（***）,specific bone surface（BS/B V）,bone volume fraction（BV/TV）,structural model index（SMI）,and degree of anisotropy（DA） were ***-finite element analyses were performed for each cube to obtain the apparent Young＇s modulus and tissue level von Mises stress distribution under 1%compressive strain along three orthogonal directions,*** revealed significant regional variations in the morphological parameters（P〈0.05）.Young＇s moduli along the trabecular orientation were significantly higher than those along the other two *** general,trabecular mechanical properties in the medial region were lower than those in the lateral *** mechanical parameters along the trabecular orientation were significantly correlated with BS/BV,BV/TV,***,and *** this study,regional variations of microstructural features and mechanical properties in the femoral head of patients with proximal femur fracture were thoroughly investigated at the tissue *** results of this study will help to elucidate the mechanism of femoral head fracture for reducing fracture risk and developing treatment strategies for the elderly.

关键词： Femoral head Trabecular bone Morphological parameters Micro-finite element analysis Apparent level Tissue level

Simulation of cells mechanical responses during perfusion culture in Voronoi-lattice scaffolds using multiphase FSI model

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Acta Mechanica Sinica 2024年第12期40卷 40-55页

作者： Shanshan Zou He Gong jiazi Gao Liming Zhou Department of Mechanics College of Mechanical and Aerospace EngineeringJilin UniversityChangchun 130022China School of Biological Science and Medical Engineering Beihang UniversityBeijing 100191China

During perfusion culture,the growth of bone tissues in the scaffold was closely related to the locations of initial adhered cells and their *** this study,the fluid mechanical responses of Voronoi-lattice scaffolds and initial adhered cells on scaffolds were quantitatively *** fluid-structure interaction(FSI)model was verified by comparing with the results of Diamond scaffolds culture in the *** mechanical responses of Voronoi-lattice scaffolds and cells were analyzed by multiphase FSI *** equations were established by response surface method(RSM)to determine relationships between structural design factors of Voronoi-lattice scaffolds and fluid mechanical response parameters of scaffolds and *** results showed that the percentage of adhered cells and the locations of initial adhered cells obtained by multiphase FSI model of Diamond scaffolds had the same trend with that obtained by perfusion *** equations established based on RSM could well predict the fluid mechanical response parameters of Voronoi-scaffolds and *** multiphase FSI model closely related the densities of cells and the locations of adhered cells to bone tissue *** model could provide a certain theoretical basis for constructing and culturing engineered bone tissues in vitro perfusion.

关键词： Voronoi-lattice scaffold Multiphase flow Fluid-structure interaction Cell trajectory Mechanical response

Regional Variations in Trabecular Morphological Features of Femoral Head of Patients with Proximal Femoral Fractures

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Journal of Bionic Engineering 2015年第2期12卷 294-303页

作者： Linwei Lv Guangwei Meng He Gong Dong Zhu jiazi Gao Meisheng Zhao School of Mechanical Science and Engineering Jilin University Changchun 130022 China School of Mechanical Engineering Tianjin University of Technology Tianjin 300384 China Department of Orthopedic Surgery the First Clinical Hospital of Jilin University Changchun 130021 China Department of Cataract Eye Hospital of the Second Clinical Hospital of Jilin University Changchun 130000 China

The regional microstructural variations in femoral head from proximal femoral fracture patients were investigated. Mi- cro-CT scanning was performed on seven femoral heads from proximal femoral fracture patients. Each femoral head was divided into three regions according to the trabecular orientation from the fovea of femoral head to the femoral neck. Eight three-dimensional trabecular cube models were reconstructed from each region. A total of 154 trabecular cubic models were reconstructed because the corresponding areas for 14 cubic models were damaged during the surgeries. Eight trabecular mor- phological parameters were measured and analyzed, namely, trabecular thickness （***）, trabecular separation （***）, spe- cific bone surface （BS/BV）, bone volum在不 fraction （BV/TV）, structural model index （SMI）, degree of anisotropy （DA）, trabecular pattern factor （***）, and trabecular number （Tb.N）. Bivariate correlation analyses were performed for all mor- phological parameters. One-way ANOVA tests were performed to analyze the differences of each parameter among three re- gions. Post-hoc multiple comparisons （Student-Newman-Keuls method） were performed to analyze the morphological differ- ence between two regions. Trabecular bone of proximal femoral fracture patients significantly degenerated in all regions of femoral heads. BV/TV was statistically correlated with ***, ***, BS/BV, ***, and Tb.N （p 〈 0.05）. Statistical differences in morphological parameters were observed between regions （p 〈 0.05）. The trabecular strength in the middle regions was significantly higher than that in other regions because of the relationships between morphological parameters and mechanical parameters. Trabeculae in the medial region were more uniform and stable along each direction than those in the lateral region. Most trabeculae in the lateral region only grew along the weight-bearing direction, and those along the other directions de- generated significantly. This study provide

关键词： femoral head trabeculae proximal femur fracture morphological parameter micro-CT

Balancing benefits of strength,plasticity and glass-forming ability in Co-based metallic glasses

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Journal of Materials Science & Technology 2021年第27期86卷 110-116页

作者： Yimeng Zhao Xuan Li Xiaobin Liu jiazi Bi Yang Wu Ruijuan Xiao Ran Li Tao Zhang Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing 100191China Institute of Physics Chinese Academy of SciencesBeijing 100190China

Development of advanced metals materials with ultrahigh strength,large plasticity and high thermostability is one of the most attractive aims for materials ***-based bulk metallic glasses(BMGs)with the highest strength(up to 6 GPa)and special strength(up to 650 Nm/g)among all of metals materials so far we known have received extensive *** this paper,a family of Co-Ta-B-Si BMGs with high glass-transition temperature(above 870 K),large compressive plasticity(up to 6.4%)and high strength(above 5.5 GPa),and high glass-forming ability(the critical diameter,Dc:up to 4 mm)was developed by accurately tuning metalloid element contents of Si and B in the parental alloy of Co_(55)Ta_(10)B_(35).The changes of glass formation and plasticity caused by the adjustment of the constituent metalloid elements were evaluated by the combination of experimental and calculated *** reason for the significant improvement of plastic deformation is revealed by the analysis of the self-organization behaviors of high-density shear bands.

关键词： Metallic glass Glass formation Thermostability Strength Plasticity