74 research outputs found
基于虚拟寄存器的控制流错误检测算法
控制流故障是航天软件系统必须面对的一个重要故障类型。提出一个基于程序基本块模型的算法
CFCVR( Control Flow Checking Based on Virtual Register, 基于虚拟寄存器的控制流检测) 对程序控制流进行检测。它首
先通过虚拟寄存器分配算法获得虚拟寄存器, 然后基于这些虚拟寄存器添加特定的控制流检测指令。这些指令可
以检测模块间的控制流错误, 所有工作都是在汇编源程序上完成的。实验表明CFCVR 会引入平均28. 7%的性能
代价和平均31. 3% 的存储代价, 而对于控制流错误检测率平均为97. 1%, 优于目前已存在的各种方法, 能够提高航
天软件容错能力和可靠性。国家高技术研究发展计划( 2005AA74201
α-羟丁酸脱氢酶与乳酸脱氢酶比值的临床意义
目的探讨α-羟丁酸脱氢酶与乳酸脱氢酶比值对心肌梗死的诊断价值。方法采用470例血清HBDH升高患者血清,分为心肌梗死组、脑部疾病组、肺部疾病组、肝脏疾病组、肾脏疾病组,测定血清中α-羟丁酸脱氢酶与乳酸脱氢酶比值。同时,设正常对照组。结果心肌梗塞组及脑部疾病组HBDH/LDH比值明显升高,与正常对照组有着显著性差异(P0.05)。结论以HBDH/LDH的比值诊断心肌梗塞较之单纯用HBDH或LDH诊断特异性高
大脑淋巴瘤病的临床及MRI特点分析
目的大脑淋巴瘤病(LC)是中枢神经系统淋巴瘤(PCNSL)的特殊类型,目前报道较少,预后较其它类型的PCNSL差,早期诊断对判断预后十分重要。本文报道经脑立体定向活检明确病理的大脑淋巴瘤病3例,以提高临床医师对大脑淋巴瘤病的认识。方法回顾性分析2017年1月-2020年7月间,中山大学附属第三医院岭南医院确诊为大脑淋巴瘤病3例患者的临床表现、影像学、神经病理特征。结果3例患者分别为44、61和64岁男性,出现进展性认知下降、视物模糊、下肢乏力等神经功能障碍表现,脑部核磁共振(MRI)发现双侧大脑弥漫性脑白质病变,表现为长T1长T2信号影,T2液体衰减反转恢复序列(T2-FLAIR)呈高信号,弥散加权序列(DWI)不均匀稍高,增强扫描强化不明显,经立体定向穿刺脑组织活检取材,镜下可见弥漫性B细胞浸润,CD20(+),结合影像学特征,均确诊为B细胞来源的大脑淋巴瘤病。结论大脑淋巴瘤病为中枢神经系统淋巴瘤的特殊类型,影像诊断困难,极易误诊,对于双侧大脑半球弥漫性病变、同时累及深部脑白质和灰质结构、无强化或小斑片状强化为影像学表现的患者,注意与此病相鉴别,尽早病灶活检,明确病理诊断,对患者的早期诊断及预后具有重要意义
Zooplanktonic diversity in the western Pacific
西太平洋区是全球海洋生物种源中心,许多类群的最高物种多样性都出现于该区域,因此,在该区开展种类多样性的研究不仅重要和必要,而且具有在跨国尺度上进行综合管理和相互合作的迫切性。本文在西太平洋的浮游动物样品鉴定分类、编目、文献资料整理和分析的基础上,记录和编入西太平洋10个浮游动物类群2,658种(含亚种),隶属于206科675属,其中水螅水母类99科251属697种,栉水母类12科22属59种,浮游软体动物14科35属86种,介形类8科89属416种,桡足类51科156属908种,糠虾类4科58属202种,磷虾类2科8属56种,十足类8科22属105种,毛颚类5科8属48种,被囊类5科26属81种。The western Pacific region has been operating as a centre for the origin of marine biodiversity: the richest diversity of many marine taxa was found in these waters.Therefore,biodiversity research and con-servation efforts in this area are necessary in order to promote the integrative and international management of this resource.The present work is a compilation of numbers of all the families,genera and species of ma-jor taxa of zooplankton known in the western Pacific Ocean(106°–150°E,0°–44°N).In all,2,658 zooplank-tonic species(including subspecies) belonging to 206 families and 675 genera have been recorded from taxonomic identifications and literature,99 families,251 genera and 697 species belong to the Medusozoa,12 families,22 genera and 59 species to the Ctenophora,14 families,35 genera and 86 species to the pelagic Molluscs(Pteropoda and Heteropoda),8 families,89 genera and 416 species to the Ostracoda,51 families,156 genera and 908 species to the Copepoda,4 families,58 genera and 202 species to the Mysidcea,2 fami-lies,8 genera and 56 species to the Euphausiacea,8 families,22 genera and 105 species to the Decapoda,5 families,8 genera and 48 species to the Chaetognatha,5 families,26 genera and 81 species to the Tunicata.908专项“中国海洋生物种类名录和图谱”(908-ZC-II-02)和908专项海洋生物样品库;科技部基础工作专项“我国和邻近西北太平洋海洋生物物种编目和分布图集编制”(2006FY220700
An Improved ViBe Algorithm Based on Fusion of Foreground Points Resampling
针对视频第一帧中存在待检测的运动物体,利用视觉背景提取算法(ViBe)对该物体后续帧检测,会在第一帧的位置上持续出现鬼影现象,提出了一种改进的ViBe算法.该算法在视频中融合连续N帧图像作为前景点的基础上,采用重采样的方法来初始化背景模型以实现动态背景有效提取.实验结果表明,提出的改进算法能有效地检测出动态背景下移动物体,并能有效地解决图像获取的鬼影现象,从而提高了算法的误检率及鲁棒性,通过改进后的ViBe算法比原算法能够更有效地检测动态背景下的运动目标.As the moving object to be detected in the first flame of the video, the object using the visual background extraction algorithm (ViBe) will continue the subsequent frame detection of the phenomenon of ghost area at the position of the first frame, an improved ViBe algorithm is proposed . The algorithm uses the resampling method to initialize the background model in order to extract the dynamic background eflficiently by merging the successive N frames in the video as the foreground points. The experimental results show that the improved algorithm can effectively detect moving objects in dynamic background, and can effectively solve the image acquisition of ghost area, thus improve the false detection rate and robustness. Through the improved ViBe algorithm is more effective than the original algorithm in detecting dynamic moving objects.福建省自然科学基金项目(2015J01587);福建省科技厅资助高校项目(JK2010056);福建省教育厅中青年项目(JAT160487
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