An Improved Fuzzy Connected Image Segmentation Method Base on CUDA

已有的模糊连接并行算法CUDA-k FOE未考虑线程块边缘点同时更新所引发的竞争问题,导致计算结果出现少量误差.由于医学图像处理对精度的要求很高,为了解决边缘点计算误差的问题,基于CUDA-k FOE提出一种修正迭代算法.首先分析了CUDA-k FOE算法在线程块边缘产生竞争的原因;然后讨论了边缘点亲和力的所有可能的传递路径,以及由此造成的出错情况;最后提出二次迭代修正算法,将第一次迭代得到的所有边缘点转入第二次的修正迭代步骤,从而修正第一次迭代中错误的亲和力值.采用3组不同规格的CT序列对肝脏血管进行分割实验,并选用3个不同的种子点进行算法验证,结果表明,文中算法的计算结果与串行版本一致,解决了CUDA-k FOE算法的计算误差问题.A paralleled CUDA version of k FOE(CUDA-k FOE)was proposed to segment medical images. CUDA-k FOE achieves fast segmentation when processing large image datasets. However, it cannot precisely handle the competition of edge points when update operations happen by multiple threads simultaneously, thus an iterative correction method to improve CUDA-k FOE was proposed. By analyzing all the pathways of marginal voxels affinity and their consequently caused results, a two iteration correction scheme is employed to achieve the accurate calculation. In these two iterations, the resulted marginal voxels from the first iteration are used as the correction input of the second iteration, therefore, the values of affinity are corrected in the second iteration. Experiments are conducted on three CT image sequences of liver vessels with small, medium, and large size. By choosing three different seed points, final results are not only comparable to the sequential implementation of fuzzy connected image segmentation algorithm on CPU, but achieve more precise calculation compared with CUDA-k FOE.国家自然科学基金(61001144;61102137;61301010;61327001

Improvement of column of machine tool based on modal analysis

机床在工作时,由于要承受各种变载荷而产生振动,其精度和寿命会受到影响,因此有必要对机床进行模态分析,了解其动态特性,以便进一步分析和改进。采用3d建模软件对机床进行建模和装配,将得到的模型导入HyPErMESH建立有限元模型,再将有限元模型导入AnSyS进行模态分析,得到机床在两种工作情况下的固有频率和振型。最后根据模态分析结果对机床立柱进行优化,得出优化结构。When the machine tool is in operation,it will undergo a variety of dynamic loads which as a consequence incur vibrations and degrade machining precision.Therefore,modal analysis is highly demanded to gain an insight into the dynamics of machining system and direct further analysis and optimization.In such a circumstance a corresponding machine tool is established via 3D CAD software and subsequently preprocessed by HYPERMESH.The finite element model produced by HYPERMESH is eventually analyzed by ANSYS to receive the natural frequencies and mode shapes of the target machine tool.An optimization design of the column of the target machine tool is thus developed based upon the modal information.国家自然科学基金资助项目(70772093);福建省高等学校新世纪优秀人才支持计划资助项目;厦门市科技计划项目(3502Z20090003

A Concise Analysis of the Difference Between Strategy Theory and Business Model Theory

文章研究了战略理论和商务模式理论的差异,认为主要表现为:战略理论将企业的外围环境视为静态的、一成不变的东西,并将直接的产业竞争环境的不确定性和复杂性视为对企业一种潜在威胁,因此企业应评估关键战略要素的机会和风险,采取前瞻性措施最大程度地规避这种潛在威胁,而企业价值是企业凭借其独特的市场定位或所拥有的核心能力单独创造出来并应独自享有。与此相对,商务模式理论将企业经营的各个子环境视为一个有机整体,将企业外部环境的不确定性和复杂性视为企业的一种潜在机遇,因而企业应积极调整经营活动组合,加速商务模式创新,充分调动各利益相关者的积极性,以充分攫取和适度分享不确定环境中的商机。This research indicates that the difference between strategy theory and business model theory mainly lies in the following.Strategy theory treats firm's surrounding environment as a static and constant thing,and treast the uncertainty and complexity of direct industry competitive environment as a potential threat to firm.So firm must evaluate the opportunity and risk of crucial strategic factors and take forward-looking actions to prevent this potential threat.Meanwhile,firm value is created wholly by firm's specific market orientation or by core competence it possesses and should all be accrued to firm accordingly.Comparatively,business model theory treats a variety of subenvironment of firm's operation as an organic integer and treats the uncertainty and complexity of firm's surrounding environment as a potential opportunity to firm.So firm should adjust the combination of business operations,accelerate the innovation of business model,motivate the enthusiasm of stake-holders,so as to appropriate fully and share adequately business opportunities embedded in uncertain environment

RE-X二元合金相图的热力学数据库

利用CALPHAD方法,采用亚正规溶体模型、亚点阵模型以及理想气体模型来描述RE-X(Ag,Bi,Cr,Mn,Mo,V,Zn)中二元系各相的Gibbs自由能,并结合相平衡及热力学性质的实验结果,对Ag-RE(RE:Sc,Y,Nd,Sm,Gd,Tb,Ho,Er)、Bi-RE(RE:Nd,Tm,Er,Ho,Pr,Gd)、Cr-RE(RE:Ce,Nd,Sm,Lu)、Mn-RE(RE:Pr,Nd,Sm,Eu,Tb,Dy,Ho,Er,Tm,Yb,Lu)、Mo-RE(RE:Sc,Y,La,Ce,Pr,Nd,Sm,Eu,Tb,Dy,Ho,Er,Tm,Yb,Lu)、V-RE(RE:La,Ce,Pr,Nd,Ho,Lu)和Zn-RE(RE:Y,Ce,Pr,Nd,Sm)各二元系相图进行热力学优化与计算。计算结果与实验数据取得很好的一致性,并结合其他相关稀土二元系相图热力学计算,初步建立部分稀土二元合金相图的热力学数据库。该热力学数据库可以提供相平衡及热力学性质等多种信息,为外推计算稀土多组元体系的相平衡提供理论基础,并为高性能稀土合金材料的设计及制备提供重要的理论指导

宝黛相争 谁伴宝玉欧洲游?

部门经理应当如何处理公与私的矛盾?领导面对复杂的人际关系,应该采取何种处事原则?家族企业中的空降CEO,如何应对各种人事矛盾避免引火烧身

观赏植物色泽：从呈色模式、色素化学、基因功能到育种策略

近年来,随着色素化学、组学及生物技术的快速发展,有力地促进了观赏植物色泽的多学科交叉研究并取得了许多重要进展。中国是世界园林之母,拥有十大传统名花,梅花、牡丹、菊花、兰花、月季、杜鹃、山茶、荷花、桂花和水仙(陈俊愉和程绪珂,1990),观赏植物色泽研究,包括呈色模式、色素化学、基因功能到育种策略,主要围绕上述十大名花展开。在本专辑中,一部分论文报告了和花色素代谢相关的结构基因/酶基因

ボタンの花色とフラボノイド色素に関する研究

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The Preliminary Discussion on the Risk Origins and the Effective Management of the Central State-owner Enterprises

中央企业风险存在的主要成因在于,盲目的非主业投资和现行的监事会制度的缺陷。而要有效进行风险管理,必须从产业政策、决策评估、产权关系及风险管理等方面采取措施,并不断完善中央企业风险管理制度,确保中央企业国有资产的保值增值。The authors explain the main origins of the risk of central state-owned enterprises,namely blind investment in non-leading industries and the defect of the current board of supervisors system.Then from perspectives of industrial policy,decision evaluation;property right relationship and risk management system,etc,we put forward corresponding policy suggestions in the hope of perfecting risk management system of central state-owned enterprise and guaranteeing the maintenance and proliferation of the state-owned assets in central enterprise

蓝莓产业发展现状与趋势

蓝莓,又名蓝浆果、越桔,为杜鹃花科(Ericaceae)越桔属(Vaccinium)多年生灌木,成熟的蓝莓果实呈深蓝色,果皮外披白霜,近圆形,果肉细腻,种子较小,果香宜人。蓝莓由于其独特的风味、极佳的保健功效而倍受公众青睐,联合国粮农组织(FAO)将其列为人类五大健康食品之一