With the rapid development of deep learning algorithms,the computational complexity and functional diversity are increasing rapidly.However,the gap between high computational density and insufficient memory bandwidth ...With the rapid development of deep learning algorithms,the computational complexity and functional diversity are increasing rapidly.However,the gap between high computational density and insufficient memory bandwidth under the traditional von Neumann architecture is getting worse.Analyzing the algorithmic characteristics of convolutional neural network(CNN),it is found that the access characteristics of convolution(CONV)and fully connected(FC)operations are very different.Based on this feature,a dual-mode reronfigurable distributed memory architecture for CNN accelerator is designed.It can be configured in Bank mode or first input first output(FIFO)mode to accommodate the access needs of different operations.At the same time,a programmable memory control unit is designed,which can effectively control the dual-mode configurable distributed memory architecture by using customized special accessing instructions and reduce the data accessing delay.The proposed architecture is verified and tested by parallel implementation of some CNN algorithms.The experimental results show that the peak bandwidth can reach 13.44 GB·s^(-1)at an operating frequency of 120 MHz.This work can achieve 1.40,1.12,2.80 and 4.70 times the peak bandwidth compared with the existing work.展开更多
目的观察电针"百会""丰隆"对高血脂合并脑缺血大鼠脑梗死体积,以及脑组织形态学的影响,探讨"化痰开窍"配穴理论对高血脂合并脑缺血的可能影响机制。方法采用雄性SD大鼠78只,随机分为正常对照组(6只)、高...目的观察电针"百会""丰隆"对高血脂合并脑缺血大鼠脑梗死体积,以及脑组织形态学的影响,探讨"化痰开窍"配穴理论对高血脂合并脑缺血的可能影响机制。方法采用雄性SD大鼠78只,随机分为正常对照组(6只)、高血脂合并假手术组、高脂血症合并脑缺血模型组、高脂血症合并脑缺血电针1组和2组(每组18只)。除正常组外,其余各组大鼠喂养高脂饲料42天,电针1组电针"丰隆",每日1次,治疗7天。第50天,模型组、电针1、2组大鼠采用50% FeCl_3化学诱导大脑中动脉血栓闭塞制造高脂血症合并脑缺血模型。术后,电针1、2组电针"百会""丰隆"穴,每日1次,持续14天。用生物化学法检测血脂,用神经功能评分法评价行为学变化,用2,3,5-氯化三苯基四氮唑法检测脑梗死体积,进行苏木素-伊红染色,用光镜观察脑组织病理形态学变化。结果与正常组比较,模型组大鼠总胆固醇(total cholesterol,TC)、甘油三脂(triglycerides,TG)、低密度脂蛋白(low density lipoprotein,LDL)升高(P<0.05),高密度脂蛋白(high density lipoprotein,HDL)降低(P<0.05)。脑缺血术后出现神经功能缺损,患侧脑组织出现脑梗死,HE染色可见神经细胞坏死,炎性细胞浸润,侧脑室背外侧角(subventricular zone,SVZ)区神经细胞增殖。电针治疗可调节血脂,减小梗死体积(P<0.01),促进缺血后缺血皮层神经细胞恢复,促进SVZ区室管膜细胞增殖。高血脂阶段早期电针治疗效果优于脑缺血后电针治疗效果。结论高血脂阶段电针可通过调节血脂代谢,改善大鼠神经功能缺损状态,缩小梗死灶体积,促进神经细胞修复和增殖,实现对高血脂合并脑缺血脑组织保护的目的。展开更多
基金Supported by the National Key R&D Program of China(No.2022ZD0119001)the National Natural Science Foundation of China(No.61834005,61802304)+1 种基金the Education Department of Shaanxi Province(No.22JY060)the Shaanxi Provincial Key Research and Devel-opment Plan(No.2024GX-YBXM-100)。
文摘With the rapid development of deep learning algorithms,the computational complexity and functional diversity are increasing rapidly.However,the gap between high computational density and insufficient memory bandwidth under the traditional von Neumann architecture is getting worse.Analyzing the algorithmic characteristics of convolutional neural network(CNN),it is found that the access characteristics of convolution(CONV)and fully connected(FC)operations are very different.Based on this feature,a dual-mode reronfigurable distributed memory architecture for CNN accelerator is designed.It can be configured in Bank mode or first input first output(FIFO)mode to accommodate the access needs of different operations.At the same time,a programmable memory control unit is designed,which can effectively control the dual-mode configurable distributed memory architecture by using customized special accessing instructions and reduce the data accessing delay.The proposed architecture is verified and tested by parallel implementation of some CNN algorithms.The experimental results show that the peak bandwidth can reach 13.44 GB·s^(-1)at an operating frequency of 120 MHz.This work can achieve 1.40,1.12,2.80 and 4.70 times the peak bandwidth compared with the existing work.
文摘目的观察电针"百会""丰隆"对高血脂合并脑缺血大鼠脑梗死体积,以及脑组织形态学的影响,探讨"化痰开窍"配穴理论对高血脂合并脑缺血的可能影响机制。方法采用雄性SD大鼠78只,随机分为正常对照组(6只)、高血脂合并假手术组、高脂血症合并脑缺血模型组、高脂血症合并脑缺血电针1组和2组(每组18只)。除正常组外,其余各组大鼠喂养高脂饲料42天,电针1组电针"丰隆",每日1次,治疗7天。第50天,模型组、电针1、2组大鼠采用50% FeCl_3化学诱导大脑中动脉血栓闭塞制造高脂血症合并脑缺血模型。术后,电针1、2组电针"百会""丰隆"穴,每日1次,持续14天。用生物化学法检测血脂,用神经功能评分法评价行为学变化,用2,3,5-氯化三苯基四氮唑法检测脑梗死体积,进行苏木素-伊红染色,用光镜观察脑组织病理形态学变化。结果与正常组比较,模型组大鼠总胆固醇(total cholesterol,TC)、甘油三脂(triglycerides,TG)、低密度脂蛋白(low density lipoprotein,LDL)升高(P<0.05),高密度脂蛋白(high density lipoprotein,HDL)降低(P<0.05)。脑缺血术后出现神经功能缺损,患侧脑组织出现脑梗死,HE染色可见神经细胞坏死,炎性细胞浸润,侧脑室背外侧角(subventricular zone,SVZ)区神经细胞增殖。电针治疗可调节血脂,减小梗死体积(P<0.01),促进缺血后缺血皮层神经细胞恢复,促进SVZ区室管膜细胞增殖。高血脂阶段早期电针治疗效果优于脑缺血后电针治疗效果。结论高血脂阶段电针可通过调节血脂代谢,改善大鼠神经功能缺损状态,缩小梗死灶体积,促进神经细胞修复和增殖,实现对高血脂合并脑缺血脑组织保护的目的。
