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双挂汽车列车横向稳定性控制策略

上海大学学报（自然科学版） 2024年第4期30卷 581-594页

作者：赵侃屈怀琨全煜坤宋云龙刘清杰邱兆文中公高远(北京)汽车检测技术有限公司北京101103 长安大学汽车学院西安710064

双挂汽车列车相较于传统半挂车具有更高的运输效率和较低的运输成本,更适合未来公路运输绿色、便捷、高效的发展趋势,但较长的车身总长度和组成单元个数必然会对双挂汽车列车的整车稳定性产生影响.为研究并验证控制策略对双挂汽车列车... 详细信息

双挂汽车列车相较于传统半挂车具有更高的运输效率和较低的运输成本,更适合未来公路运输绿色、便捷、高效的发展趋势,但较长的车身总长度和组成单元个数必然会对双挂汽车列车的整车稳定性产生影响.为研究并验证控制策略对双挂汽车列车横向稳定性的改善情况,基于Trucksim仿真平台搭建双挂汽车列车(B型双挂车)动力学模型,依据运动力学定律建立Simulink双挂汽车列车简化参考模型,分别以动力学和参考模型中各个单元的横摆角速度偏差、横向载荷转移率偏差为输入,结合模糊推理和PID(proportional-integral-derivative control,PID)控制理论构建整车横摆和侧倾稳定性主动控制策略,并根据车辆状态识别结果对控制策略的介入时机进行调整.模拟结果显示:主动控制策略使双挂汽车列车横向稳定性评价参数的波动幅度均有明显减小;各个单元的质心侧偏角峰值降低5.7%∼53%,横摆角速度峰值降低4.9%∼23.8%,侧倾角峰值降低0.5%∼24.9%,质心侧偏角峰值降低0.3%∼32.9%.表明本工作所设计的控制策略对双挂汽车列车的横向稳定性有改善作用,研究结果可为未来双挂汽车列车的横向稳定性研究提供参考.

关键词：双挂汽车列车横向稳定性控制模糊推理 PID 控制差动制动

基于非对称多解码器和注意力模块的三维肾脏影像结构分割模型

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计算机应用 2024年第7期44卷 2216-2224页

作者：孔哲李寒甘少伟孔明茹何冰涛郭子钰金督程邱兆文东北林业大学计算机与控制工程学院哈尔滨150040 哈尔滨工业大学电子与信息工程学院哈尔滨150001

针对肾脏结构中,因不同结构间差异大,动静脉体积小、结构薄及计算机断层扫描血管造影(CTA)图像灰度分布不均和伪影带来的精确分割困难的问题,提出基于非对称多解码器和注意力模块的三维肾脏影像结构分割模型MDAUnet(MultiDecoder-Attent... 详细信息

针对肾脏结构中,因不同结构间差异大,动静脉体积小、结构薄及计算机断层扫描血管造影(CTA)图像灰度分布不均和伪影带来的精确分割困难的问题,提出基于非对称多解码器和注意力模块的三维肾脏影像结构分割模型MDAUnet(MultiDecoder-Attention-Unet)。首先,针对不同结构间差异大导致网络无法共享权重的问题,采用多解码器结构,为语义结构不同的特征结构匹配不同的解码器分支;其次,针对血管体积小、结构薄难分割的问题,引入非对称的空间通道联合注意力模块使模型更关注管状结构,并对学习到的特征信息同时进行空间维度和通道维度的校准;最后,为了保证模型在反向传播中对血管结构有足够的关注,提出改进的加权硬区域适应损失(WHRA)作为损失函数来动态保持训练过程中血管结构的类间平衡以及保留背景信息的特征;此外,为了提高特征图灰度值的对比度,将传统图像处理边缘检测算子嵌入模型的预处理阶段,对待分割的感兴趣区域边界进行特征增强使模型更关注边界信息并抑制伪影信息。实验结果表明:所提出的MDAUnet模型在肾脏结构分割任务上的Dice相似系数(DSC),豪斯多夫距离95(HD95)和平均表面距离(AVD)分别为89.1%,1.76 mm和1.04 mm;在DSC指标上,与次优的MGANet(Meta Greyscale Adaptive Network)相比,MDAUnet提升了1.2个百分点;在HD95和ASD指标上,与次优的UNETR(UNEt TRansformers)相比,MDAUnet分别降低了0.87 mm和0.45 mm。可见MDAUnet能有效提高肾脏三维结构分割精度,有助于医生在临床手术中客观有效地评估病情。

关键词：肾脏三维结构分割注意力模块计算机断层血管造影损失函数边缘检测

Multi-DAGs Scheduling Integrating with Security and Availability in Cloud Environment

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Chinese Journal of Electronics 2015年第4期24卷 709-716页

作者： LIU Yaqiu SHAO Hongrun JING Weipeng qiu zhaowen The College of Information and Computer Engineering Northeast Forestry University Heilongjiang Province Engineering Technology Research Centre for Forestry Ecological Big Data Storage and High Performance (Cloud) Computing

In view of the issue concerns multiple Directed acyclic graphs(DAGs) scheduling in multi-tenant cloud computing environment, a scheduling strategy that integrate security and availability is proposed to satisfy the tenants’ requirements for resource security and availability, as thus it can not only protect the users’ privacy and data security but also advance the success rate. The proposal assesses resource reputation to ensure jobs can be scheduled onto relatively security nodes; during task scheduling, it classifies the DAGs to achieve fairness; in the process of resources allocation, the objective function would maximize the user’s security satisfaction and minimize the deviation of availability; meanwhile, it takes advantage of "time chips" flexibly to promote resource utilization rate; afterwards, we present a Greedy algorithm integrating with security and availability(GISA) to implement the strategy. The experimental results show the correctness and superior of the novel strategy.

关键词： Multi-DAGs scheduling Security Availability Resource utilization

Characteristics and metallogenesis of epithermal gold (copper)deposits in the middle-south parts of Tancheng-Lujiang deep fault zone and its vicinity, eastern China

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Chinese Science Bulletin 1999年第S2期44卷 63-65页

作者： qiu Jiansheng and XU zhaowen Department of Earth Sciences, Nanjing University, Nanjing 210093, China Department of Earth Sciences Nanjing University Nanjing 210093 China

EPITHERMAL gold (copper) deposits distributed in the middle-south parts of Tancheng-Lujiang deep faultzone and its vicinity have close relation to Mesozoic shoshonitic magmatism. According to their metallogenic features and ore-forming conditions, these deposits can be divided into three types; tellurium-goldtype Au deposit, quartz-adularia type Au deposit and quartz-manganoansiderite type Au-Cu deposit. Therepresentative deposits of them are Guilaizhuang, Dongxi and Tiantoushan. In this note, the general features of the three typical epithermal gold (copper) deposits are outlined and the relationship between mineralization and types of volcanic basins is discussed preliminarily.

关键词： epithermal gold(copper) deposits metallogenesis eastern China.

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改善颗粒物污染的道路绿地植被屏障研究进展

生态学报 2022年第13期42卷 5177-5186页

作者：任飞虹白骅邱兆文田顺长安大学建筑学院西安710061 长安大学汽车学院西安710064

减少道路环境的颗粒物污染对通勤者的健康至关重要。道路绿地在交通排放和邻近区域之间形成屏障,但这种植被屏障是否可以有效消减局部颗粒物污染仍然需要深入研究和探讨。结合现有研究成果,阐述了植被对颗粒物污染的影响途径;分析了街... 详细信息

减少道路环境的颗粒物污染对通勤者的健康至关重要。道路绿地在交通排放和邻近区域之间形成屏障,但这种植被屏障是否可以有效消减局部颗粒物污染仍然需要深入研究和探讨。结合现有研究成果,阐述了植被对颗粒物污染的影响途径;分析了街道峡谷和开放道路两种典型城市道路环境中,植被组成及群落结构设计的关键特征对颗粒物分布和扩散的影响;总结了有利于消减颗粒物浓度的植被单株性状和叶片微形态;探讨了影响颗粒物浓度的其他因子的耦合作用;针对不同道路环境提出了有效的植被屏障设计建议,并指出了植被群落设计和叶片微形态方面的研究趋势,以期优化道路植被规划,改善路域空气质量。

关键词：颗粒物污染开放道路街道峡谷植被屏障叶片微形态

Challenges and prospects for room temperature solid-state sodiumsulfur batteries

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Nano Research 2024年第3期17卷 1402-1426页

作者： Yashuang qiu Jing Xu Research Center of Grid Energy Storage and Battery Application School of Electrical and Information EngineeringZhengzhou UniversityZhengzhou 450001China

Room temperature sodium-sulfur(Na-S)batteries,known for their high energy density and low cost,are one of the most promising next-generation energy storage ***,the polysulfide shuttling and uncontrollable Na dendrite growth as well as safety issues caused by the use of organic liquid electrolytes in Na-S cells,have severely hindered their ***-state electrolytes instead of liquid electrolytes are considered to be the most direct and effective solution to solve the above ***,its practical application is still greatly challenged due to the poor interfacial compatibility between the all-solid-state electrolytes and the anode/cathode,ionic conductivity,and the shuttle effect caused by the presence of liquid phase in the quasi-solid-state *** paper presents a comprehensive review of solid-state Na-S batteries from the perspective of regulating interfacial compatibility and improving ionic conductivity as well as suppressing polysulfide *** to different components,solid-state electrolytes were divided into five categories:solid inorganic electrolytes,solid polymer electrolytes,polymer/inorganic solid hybrid electrolytes,gel polymer electrolytes,and liquid–solid inorganic hybrid ***,the prospect of developing high performance solid-state electrolytes to improve the cycling stability of room temperature Na-S cells is envisaged.

关键词： sodium-sulfur batteries solid-state electrolytes ionic conductivity polysulfide shuttling interfacial compatibility

Enhanced service stability and thermoelectric performance in Cu_(2)−δSebased composites

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Science China Materials 2024年第7期67卷 2369-2370页

作者： Pengfei qiu Xun Shi State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China

Thermoelectric(TE)materials can directly convert the industrial waste heat into useful electricity based on the Seebeck effect,providing a promising way to tackle the environmental pollution and global energy crisis[1].In the past several decades,many new high-performance TE materials have been discovered to enrich the TE *** them,Cu_(2)−δSe-based TE materials,which are in line with the“phonon-liquid electron-crystal”concept,have sparked widespread interest due to the high TE figure-of-merit(ZT)and the combination of elements that are nontoxic and earth-abundant[2].In 2012,Liu et al.[3]reported a ZT of 1.5 at 1000 K in the stoichiometric Cu_(2)*** alloying S at the Se-site,the ZT was enhanced to around 2.0 at 1000 K[4].Via incorporating carbon nanotubes,the ZT was further enhanced to 2.4 at 1000 K[5].Moreover,Yang et al.[6]and Zhou et al.[7]reported that the ZT of Cu_(2)Se/BiCuSeO composites can reach 2.7–2.8 around 1000 K.

关键词： composites BiCuSeO performance

y-Tuning: an efficient tuning paradigm for large-scale pre-trained models via label representation learning

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Frontiers of Computer Science 2024年第4期18卷 107-116页

作者： Yitao LIU Chenxin AN Xipeng qiu School of Computer Science Fudan UniversityShanghai 200433China

With current success of large-scale pre-trained models(PTMs),how efficiently adapting PTMs to downstream tasks has attracted tremendous attention,especially for PTMs with billions of *** work focuses on designing parameter-efficient tuning paradigms but needs to save and compute the gradient of the whole computational *** this paper,we propose y-Tuning,an efficient yet effective paradigm to adapt frozen large-scale PTMs to specific downstream tasks.y-Tuning learns dense representations for labels y defined in a given task and aligns them to fixed feature *** computing the gradients of text encoder at training phrase,y-Tuning is not only parameterefficient but also *** results show that for DeBERTaxxL with 1.6 billion parameters,y-Tuning achieves performance more than 96%of full fine-tuning on GLUE Benchmark with only 2%tunable parameters and much fewer training costs.

关键词： pre-trained model lightweight fine-tuning paradigms label representation

The First Five Years of a Phase Theory for Complex Systems and Networks

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IEEE/CAA Journal of Automatica Sinica 2024年第8期11卷 1728-1743页

作者： Dan Wang Wei Chen Li qiu Division of Decision and Control Systems KTH Royal Institute of TechnologyStockholm 10044Sweden Department of Mechanics and Engineering Science&the State Key Laboratory for Turbulence and Complex Systems Peking UniversityBeijing 100871China Hong Kong University of Science and Technology Hong KongChinaand also with the Southern University of Science and TechnologyShenzhen 518055China

In this paper,we review the development of a phase theory for systems and networks in its first five years,represented by a trilogy:Matrix phases and their properties;The MIMO LTI system phase response,its physical interpretations,the small phase theorem,and the sectored real lemma;The synchronization of a multi-agent network using phase *** the end,we also summarize a list of ongoing research on the phase theory and speculate what will happen in the next five years.

关键词： Consensus and synchronization matrix phases multi-agent systems phase theory sectored real lemma small phase theorem.