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Array-level boosting method with spatial extended allocation to improve the accuracy of memristor based computing-in-memory chips

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Science China(Information Sciences) 2021年第6期64卷 80-88页

作者： Wenqiang ZHANG Bin GAO Peng YAO Jianshi TANG he qian Huaqiang WU Institute of Microelectronics Beijing National Research Center for Information Science and Technology (BNRist)Tsinghua University Institute of Microelectronics Beijing National Research Center for Information Science and Technology (BNRist)Tsinghua University

Memristor based computing-in-memory chips have shown the potentials to accelerate deep neural networks with high energy efficiency. Due to the inherent filament-based conductive mechanism of the memristor, the reading and writing noises are hard to eliminate. Besides, the precision of the large-scale memristor array is still limited. However, when the noise of the memristor is large, the existing training methods to reduce the accuracy loss of memristor based computing-in-memory chips will face ***, we proposed the array-level boosting method with spatial extended allocation to reduce the accuracy loss induced by the limited precision and large noises. To optimize the spatial allocation number of each layer in the neural network, the greedy spatial extended allocation algorithm is also proposed. The image processing and classification tasks are demonstrated based on fabricated 32×128 memristor arrays to valid the performance of the proposed method. The chip-in-loop results show that the recovered accuracy of ResNet-34 on CIFAR-10 with array-level boosting method is 92.3%, which is closed to software-based accuracy of 93.2%.

关键词： memristor computing-in-memory array-level boosting neuromorphic computing RRAM

ZIF-67@CdS光催化剂的合成及其光催化性能研究

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兰州文理学院学报（自然科学版） 2024年第3期38卷 79-84,128页

作者：李翠林李星何倩王华兰州文理学院化工学院甘肃兰州730000

采用溶剂热法原位合成出一种新型MOF基复合光催化剂ZIF-76@CdS,用FT-IR、XRD和SEM等手段对催化剂的结构和形貌进行了表征,研究了ZIF-76@CdS对有机污染物亚甲基蓝的光催化降解性能,探究了光催化反应可能的机理.研究结果显示:复合光催化剂... 详细信息

采用溶剂热法原位合成出一种新型MOF基复合光催化剂ZIF-76@CdS,用FT-IR、XRD和SEM等手段对催化剂的结构和形貌进行了表征,研究了ZIF-76@CdS对有机污染物亚甲基蓝的光催化降解性能,探究了光催化反应可能的机理.研究结果显示:复合光催化剂ZIF-76@CdS对亚甲基蓝的光催化降解活性均优于单独的CdS与ZIF-76.经模拟太阳光照射60 min后,对10 mg/L的亚甲基蓝溶液降解率达到89.94%,分别是单一CdS和ZIF-67催化下的1.72和1.42倍,经过5次循环实验后,ZIF-76@CdS对亚甲基蓝光催化降解率仅下降了4.02%.CdS和ZIF-67的成功复合,扩大了对可见光的吸收范围,可以有效防止电子和空穴的复合,提高载流子的利用效率,使得复合光催化剂ZIF-76@CdS具有较高的催化活性.

关键词： MOF CdS 亚甲基蓝光催化降解

Soft measurement model on torque of alternating current electrical dynamometer including copper loss and iron loss

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Journal of Central South University 2019年第8期26卷 2272-2280页

作者： ZHONG Ding-qing WANG Ai-lun he qian School of Mechanical and Electrical Engineering Central South University Changsha 410083 China School of Mechanical Engineering Hunan Institute of Engineering Xiangtan 411104 China

Alternating current electrical dynamometer is a common device to measure the torque of engines, such as the gasoline engine. In order to solve the problems such as high cost, high energy consumption and complicated measurement system which exists in the direct measurement on the torque of alternating current electrical dynamometer, copper loss and iron loss are taken as two key factors and a soft-sensing model on the torque of alternating current electrical dynamometer is established using the fuzzy least square support vector machine (FLS-SVM). Then, the FLS-SVM parameters such as penalty factor and kernel parameter are optimized by adaptive genetic algorithm, torque soft-sensing is investigated in the alternating current electrical dynamometer, as well as the energy feedback efficiency and energy consumption during the measurement phase of a gasoline engine loading continual test is obtained. The results show that the minimum soft-sensing error of torque is about 0.0018, and it fluctuates within a range from -0.3 to 0.3 N·m. FLS-SVM soft-sensing method can increase by 1.6% power generation feedback compared with direct measurement, and it can save 500 kJ fuel consumption in the gasoline engine loading continual test. Therefore, the estimation accuracy of the soft measurement model on the torque of alternating current electrical dynamometer including copper loss and iron loss is high and this indirect measurement method can be feasible to reduce production cost of the alternating current electrical dynamometer and energy consumption during the torque measurement phase of a gasoline engine, replacing the direct method of torque measurement.

关键词： torque fuzzy theory least square support vector machine alternating current electrical dynamometer

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基于动力学模型的脱皮核桃仁干燥工艺研究

食品与发酵工业 2024年第18期50卷 33-41页

作者：胡希婷胡建亮郜春喜杜素军成玉梁郭亚辉常巧英钱和江南大学食品学院江苏无锡214122 河北华岱农业科技有限公司河北石家庄051230 中国检验检疫科学研究院北京100176

该研究针对脱皮核桃仁干燥过程中导致的品质劣变、能耗高等问题,开展其在常压与真空干燥条件下的干燥动力学研究,通过建立干燥动力学模型比较不同干燥条件对脱皮核桃仁干燥特性的影响,以失重率、色差、酸价、过氧化值及能耗为品质指标,... 详细信息

该研究针对脱皮核桃仁干燥过程中导致的品质劣变、能耗高等问题,开展其在常压与真空干燥条件下的干燥动力学研究,通过建立干燥动力学模型比较不同干燥条件对脱皮核桃仁干燥特性的影响,以失重率、色差、酸价、过氧化值及能耗为品质指标,结合主成分分析客观评价不同干燥工艺下核桃仁的品质变化差异。结果表明,干燥效率0.1 MPa真空干燥>0 MPa常压干燥>0.05 MPa真空干燥;在不同真空度和温度条件下,脱皮核桃仁中水分干燥过程的适用模型有Two-term、Wang&Singh、Page和多项式模型;真空度对脱皮核桃仁的失重率影响较小,与色差呈反比,温度、真空度对酸价影响不明显,对过氧化值影响显著,真空干燥的过氧化值较低,随着温度上升、干燥能耗显著降低,0.05 MPa真空干燥能耗最多,0.1 MPa所需能耗与常压差不多;总体上,干燥品质0.1 MPa真空干燥>0.05 MPa真空干燥>0 MPa常压干燥。综合考虑干燥效率和品质最大保留后的最佳工艺条件为50℃、0.1 MPa、12.0 h,干燥后脱皮核桃仁的酸价为(0.43±0.03)mg/g、过氧化值为(0.11±0.01)mmol/kg、干燥能耗为(3012.81±440.87)kJ/g。

关键词：脱皮核桃仁干燥动力学模型酸价过氧化值主成分分析

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Reconfiguration decision making in cognitive wireless network

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Chinese Science Bulletin 2012年第28期57卷 3713-3722页

作者： ZHANG Ping he qian FENG ZhiYong ZHANG QiXun Wireless Technology Innovation Institute(WTI) Key Laboratory of Universal Wireless Communications of Ministry of Education Beijing University of Posts and TelecommunicationsBeijing 100876China

Facing the challenges of dynamic adaptation capabilities in the time-varying environment of cognitive wireless networks(CWNs),we introduce reconfiguration capabilities that flexibly and dynamically adapt to changing wireless environments and service *** an essential characteristic of CWNs,the cognitive reconfiguration can meet user requirements,realize interoperability between heterogeneous networks,make full use of radio resources and adapt to time-varying environments to achieve end-to-end ***,the reconfiguration implementation is still challenging due to the need for complex environment cognition,multi-objective optimization,autonomic decision-making and end-to-end requirement *** an intelligent technology for solving complex issues,we apply adaptive neuro-fuzzy inference system(ANFIS) techniques in this paper to address these challenges in cognitive reconfiguration for self-learning and optimal decision making based on multi-domain cognition ***,this paper designs a generic ANFIS cognitive reconfiguration system including three functional entities,which are the context management module,multi-domain database and ANFIS optimization ***,numerous results prove the effective performance improvements of the ANFIS based reconfiguration solution in CWN for global end-to-end goals.

关键词：配置系统优化决策无线网络自适应神经模糊推理系统 ANFIS 适应能力时间变化网络环境

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南川页岩气水平段轨迹控制技术分析

化工设计通讯 2024年第4期50卷 24-26,44页

作者：王恒何谦潘通陈雅辉中国石化华东工程六普钻井分公司江苏镇江212001 中石化重庆页岩气有限公司重庆南川408400

重庆南川区块页岩气开发早期水平段使用旋导及近钻头技术,但随着区块开发力度的加大,为进一步降本提效,开始逐步推广使用单弯螺杆钻具+LWD组合进行施工。但受制于LWD仪器零长、螺杆等原因,导致伽马曲线数据滞后,调整轨迹段较长,从而频... 详细信息

重庆南川区块页岩气开发早期水平段使用旋导及近钻头技术,但随着区块开发力度的加大,为进一步降本提效,开始逐步推广使用单弯螺杆钻具+LWD组合进行施工。但受制于LWD仪器零长、螺杆等原因,导致伽马曲线数据滞后,调整轨迹段较长,从而频繁穿层追层,易引起井下复杂,使得目的层钻遇率低。为此,通过从目的层岩性、钻井参数分析、工具及地层增降斜趋势、伽马曲线等四个方面出发,总结分析四者参数与地层层位变化时的对应关系,从而达到提升层位判断准确性的目的,减少仪器零长盲区而造成的误差,对提高南川区块页岩气水平段钻遇率有一定的借鉴意义。

关键词：页岩气水平段 LWD 参数变化层位判断

Amino-metalloporphyrin polymers derived Fe single atom catalysts for highly efficient oxygen reduction reaction

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Science China Chemistry 2020年第6期63卷 810-817页

作者： qian he Yuying Meng Hao Zhang Ying Zhang Qingdi Sun Tao Gan Huajian Xiao Xiaohui he Hongbing Ji Fine Chemical Industry Research Institute School of ChemistrySun Yat-sen UniversityGuangzhou 510275China Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632China Fine Chemical Industry Research Institute School of Chemical Engineering and TechnologySun Yat-sen UniversityZhuhai 519082China School of Chemical Engineering Guangdong University of Petrochemical TechnologyMaoming 525000China

Recently,nitrogen-doped porous carbon supported single atom catalysts(SACs)have become one of the most promising alternatives to precious metal catalysts in oxygen reduction reaction(ORR)due to their outstanding performance,especially those derived from porphyrin-based ***,most of them involve other metal residuals,which would cause the tedious pre-and/or post-treatment,even mislead the mechanistic investigations and active-site ***,we report a precursor-dilution strategy to synthesize Fe SACs through the Schiff-based reaction via co-polycondensation of amino-metalloporphyrin,followed by pyrolysis at high *** characterization results provide the compelling evidence of the dominant presence of atomically dispersed *** catalyst shows superior ORR performance with positive half-wave potential(E1/2=0.85 V ***)in alkaline condition and moderate activity(E1/2=0.68 V ***)under the acidic condition,excellent methanol tolerance and good long-term *** the results indicate Fe SACs would be a promising candidate for replacing the precious Pt in metal-air batteries and fuel cells.

关键词： single atom catalysts porphyrin precursor-dilution oxygen reduction reaction active site

人工智能视觉识别系统在外来医疗器械检查中的应用效果

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护士进修杂志 2024年第2期39卷 161-163,203页

作者：吴小娜陈慧何倩刘佳微四川大学华西医院/华西护理学院洗浆消毒供应中心四川成都610041

目的探讨人工智能视觉识别系统在消毒供应中心(CSSD)外来骨科医疗器械包装质量的应用效果。方法我院于2022年1月将采集在CSSD处置的骨科外来器械信息,包括(图像、名称规格、数量)等传送至人工智能视觉识别系统中存档,实现图像数据分... 详细信息

目的探讨人工智能视觉识别系统在消毒供应中心(CSSD)外来骨科医疗器械包装质量的应用效果。方法我院于2022年1月将采集在CSSD处置的骨科外来器械信息,包括(图像、名称规格、数量)等传送至人工智能视觉识别系统中存档,实现图像数据分析与回溯、归档预警提示。即选取2021年2-12月系统应用前我院消毒供应中心接收处理的9 600包骨科外来器械为对照组。2022年1月-11月系统应用后的9 600包为观察组,比较2组医疗器械包装质量及管理工作情况(包装质量、平均耗时、使用满意度)。结果观察组医疗器械包装质量优于对照组,差异有统计学意义(P<0.05);包装平均耗时及使用满意度优于对照组,差异有统计学意义(P<0.05)。结论人工智能视觉识别系统在CSSD外来骨科医疗器械包装环节,核查应用中效果较好。提升包装质量的同时,也优化了外来骨科医疗器械管理流程、提高了手术室满意度和工作效率。

关键词：消毒供应中心人工智能视觉识别外来骨科医疗器械包装质量

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思维导图在医学影像学中的应用研究

智慧健康 2024年第5期10卷 190-194页

作者：焦淙汇王晨晖何倩新乡医学院三全学院河南新乡453003

思维导图是一种视觉思维方法,使用关键词和多种信号作用于人脑,特点是可以大大提高理解和记忆,有助于培养逻辑思维能力和创造性思维能力。作为学生思维学习的辅助工具,思维导图一方面有助于提高教学老师备课效率,另一方面也有助于提升... 详细信息

思维导图是一种视觉思维方法,使用关键词和多种信号作用于人脑,特点是可以大大提高理解和记忆,有助于培养逻辑思维能力和创造性思维能力。作为学生思维学习的辅助工具,思维导图一方面有助于提高教学老师备课效率,另一方面也有助于提升学生的记忆力、学习效率和临床思维能力,有助于教学质量和效率的提高。医学影像学与传统思维导图教学相结合,可以利用思维导图的特点弥补传统教学中教学模式单一、教学内容多且杂、学生学习主观能动性不强等不足之处,在实践教学中具有重要意义。

关键词：思维导图医学影像学教学应用研究