89 research outputs found

    Design and Implementation of Supermarket Chain Information Management System Based on Oracle

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    近年来,我国商品零售业发展十分迅速。其中的超市形态,由最开始的小型自选超市,已经发展为涵盖百货超市、大卖场、标超和便利店等形式的连锁零售形态,同时,经营的商品品种越来越多、组织形式越来越集团化、经营方式也越来越集中化。由于零售行业的激烈竞争,各种规模超市必须整合起来才能成功地占有市场份额。因此,开发一款面向超市仓储化管理,能够整合超市各种信息的后台管理信息系统成为零售企业的迫切需求。 本论文首先讲述了超市管理系统的研究背景及意义。接着,文章简单描述了系统开发所设计的相关技术。再次,文章从业务需求和功能需求两个方面对系统进行需求分析。接下来,文章对系统整体框架、功能架构、输入输出模块以及数据库...In recent years, our country’s retail industry has developed rapidly. Starting with small optional supermarkets, the supermarket business has developed into a chain retail form covering department supermarkets, hypermarkets, standard supermarkets and convenience stores. At the same time, there are more and more varieties of goods, the organization form is more and more collectivized, and the opera...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323059

    The Detection of Outlier and Application with Neuron-Fuzzy Modeling

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    近年来,基于神经网络与模糊逻辑的神经模糊建模已经被用于将专家领域知识转化为计算机表达的知识建模,其中最突出的方法是Jang于1993年提出的自适应神经模糊建模(ANFIS)方法。一般应用ANFIS建模的数据都是清洁的或者假定清洁的,如果数据是清洁的,可能比较容易达到满意的结果;但是如果数据是不清洁的,即含有异常数据,那么它们必然对ANFIS建模产生不利影响。本文所做的工作是对蓄电池剩余电量数据和飞机油箱剩余油量数据进行异常数据检测并应用ANFIS建模。首先对异常数据的定义及常用异常数据检测方法做了综述,举例阐述了分析异常数据的意义,分析了现有异常检测算法的优点和不足。然后通过一个函数逼近实例分...These years, neuro-fuzzy modeling has been applied to knowledge modeling which transformed knowledge in special fields into computer language. In all kinds of neuro-fuzzy modeling methods, the ANFIS(Adaptive-Network-based Fuzzy Inference Systems)method which was proposed by Jang in 1993 is the most prominent one.usually,the modeling data set is clean, we can acquire satisfied model mostly if it is...学位:工学硕士院系专业:信息科学与技术学院自动化系_控制理论与控制工程学号:20033100

    Development and Modification Study of Polymer Optical waveguide thin films

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    近年来,随着光通信和集成光学研究的飞速发展,薄膜光波导被广泛应用于光无源器件和集成光路中,利用它可以完成开关、调制、复接等许多光作用,各种光集成结构都是围绕光波导而展开的,光波导制备的技术也由于薄膜光波导的广泛应用而飞速发展。聚合物波导因为制作工艺简单、价格低廉、容易和半导体器件和光纤集成等优点,将在上述领域发挥巨大的作用。因此,研制成本低且性能优良的聚合物薄膜及其光波导,对于聚合物薄膜光波导及其器件的研究和实用化有着重要的理论意义和实践意义。本文简述了平面光波导理论和平面光波导材料的研究现况,并比较了各种平面光波导制备工艺的特性,特别详细地介绍了溶胶-凝胶法制备薄膜的特点及其工艺流程。论文工...Recently, with the great development of research in optical communication and integrated-optics, optical waveguide thin films are applied widely in the optical passive device and optical integrated-circuit, which can implement many optical functions including switching, modulating and compound-meeing etc.. Various optical integrated configurations are made of optical waveguides, and the preparatio...学位:理学硕士院系专业:计算机与信息工程学院电子工程系_无线电物理学号:20023000

    Half-taper Fiber Coupled High-Q and Ultra-narrow-linewidth Er:ZBLALiP Microspherical Cavity Whispering Gallery Mode Laser

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    本文采用半熔锥光纤耦合Er:ZBLALiP球微腔实现了高Q(8.8×105)超窄线宽(11kHz)稳定连续输出回廊模激光。 首先对回廊模激光器的研究状况做了简要回顾,对微腔光学特性进行讨论。建立球微腔耦合模型并对其进行分析和讨论,获得Er:ZBLALiP球微腔和熔锥光纤有效耦合相位匹配条件。实验观测到模式分裂双峰共振现象。 其次测出块状Er:ZBLALiP的吸收光谱,运用McCumber和Judd-Ofelt理论对其进行光谱分析并算出铒离子的光谱参数。研究块状Er:ZBLALiP的上转换并实现点状Er:ZBLALiP球微腔温度传感器。 然后建立参数可调滤波模型,通过改变耦合参数并利用相位...A whispering gallery mode laser with an ultra-narrow-linewidth of 11kHz and stable continuous-wave output has been obtained successfully using a half taper fiber which coupled with a high Q of 8.8×105 erbium doped fluoride glass ZBLALiP microspherical cavity. The history of theoretical and experimental studies of whispering gallery mode lasers are reviewed. The optical properties of microcav...学位:工学博士院系专业:信息科学与技术学院通信工程系_通信与信息系统学号:2332006015339

    旋回シュ-トにおけるエロージョンの数値解析と摩耗予測

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    Erosive wear, also called as erosion, is a usual phenomenon for damage or loss on the surface of material impacted by solid particles. It has become one of the biggest problems over components such as pneumatic conveyance or fluid delivery pipelines in many industrial fields, causing risks and economic loss. So erosion has become a research issue attracting wide attentions of many researchers for several decades. Generally, research studies of erosion can be classified into two types: experiment and numerical simulation. And there is no doubt that experiment is a direct way for erosion researches. However, experiment is usually cost- and time-consumed, besides, it is impossible to obtain all information during erosion process experimentally, such as stress and plastic strain and so on, so as not to fully uncover the mechanisms of erosion. Therefore, numerical simulation exhibits its incomparable advantages over experiment, and has become more and more utilized with the development of computational technology. The work of this thesis conducted several problems about erosion using numerical simulation. The simulation involved in this thesis includes three kinds of numerical method: Finite Element Method (FEM), Smoothed Particle Hydrodynamics(SPH) and Discrete Element Method (DEM). The main contents of this thesis are summarized as follows: In chapter 1, research background and literature reviews for previous researches are introduced. In chapter 2, experiments for this thesis are described. In chapter 3, 3D FE models for spheroidal carbide cast iron (SCI) and spheroidal graphite cast iron (FCD) were built. The impact angle dependences of erosion on these two materials were verified using analytical results from view point of stress and equivalent plastic strain. In chapter 4, 3D FE models for mild steel (SS400) and spheroidal graphite cast iron (FDI) were built. The mechanisms of these two materials were explained with a combined consideration of plastic strain and shear stress on material surface. In chapter 5, 3D FE models for mild steel of 5 spherical particles impact were built. Two different material models, named as Johnson-Cook material model and simple material model, were applied into target material respectively. The differences of erosion performances under these two different material models were compared and discussed. In chapter 6, numerical models of angular particles impact were built using a coupled algorithm of SPH-FEM. Impact process of angular particles on mild steel were investigated. In chapter 7, a predictive method for erosion on rotating chute is proposed using a coupled simulation of DEM and FEM. In chapter 8, a general conclusion of this thesis and prospects for future work are given.エロージョンは, 主な摩耗機構の一つであり, 粉粒体の衝突により材料表面が損傷, 除去される現象である. この現象は固気二相流による輸送系でのパイプベンド部や, バルブ等において深刻的な問題となっている. 生産効率の向上及びメンテナンス費低減の観点から, 耐摩耗材料の開発, 余寿命の予測はエンジニアリング上, 解決すべき課題である.エロージョンに関する研究は, 実験及び数値解析の2種類に分類されている. 実験は直接的な方法に間違いない. しかし, 実験には費用や時間がかかる. また, 粒子の衝突に伴う材料表面の応力やひずみ等の変形破壊挙動に関する様々なデータを, 実験によって取得するのは困難である. 従って, 数値解析は実験と比べて特有の優位性が示され, 既にエロージョンの研究に用いられてきた. 特に計算技術がますます発展する現在, 数値解析の使用は幅広くなっている. 本研究では, エロージョンに関する摩耗メカニズムを解明するため, 有限要素法(FEM), 粒子法であるSmoothed Particles Hydrodynamics (SPH)法及び離散要素法(DEM)の3種類の解析方法を適用した. 本論文の内容を以下に要約する.第一章では, 研究背景やこれまでの研究を述べると共に, 本研究の意義及び目的を述べた.第二章では, 本研究における実験材料および実験設備, 実験方法を述べた.第三章では, 球状炭化物鋳鉄(SCI)及び球状黒鉛鋳鉄(FCD)をモデルとし, FEMによる三次元単一粒子衝突解析を進め, 衝突角度依存性は, 単一粒子の衝突における塑性ひずみと定性的な類似関係であることを明らかにした.第四章では, 軟鋼(SS400)及び球状黒鉛鋳鉄(FDI)を対象とし, FEMによる三次元単一粒子衝突解析を進め, 粒子衝突時に材料表面に生じるひずみ及びせん断応力からエロージョンメカニズムを力学的に考察した.第五章では, 三次元衝突モデルをFEMで作成し, 被衝突材には5つの粒子を連続的に衝突させた. Johnson-Cookモデル及びsimpleモデルの2つの材料モデルを使用した. 2つの解析モデルにより, 粒子の連続衝突によるエロージョン現象を再現した.第六章では, SPH及びFEM法を組合せることで三次元モデルを作成し, 鋭形粒子衝突におけるエロージョン現象を力学的に明らかにした.第七章では, 製鉄所の設備である高炉上部の旋回シュートを対象として摩耗予測を行った. 旋回シュートの三次元モデルを作成し, 旋回シュートにおける鉱石流動をDEM法で作成した. 旋回シュートにおいて流動鉱石が衝突する際の応力状態が推定された.第八章では, 本研究の成果及び今後の発展を記述した.室蘭工業大学 (Muroran Institute of Technology)博士(工学

    A New GA - Bas e d Op timizatio n Met h o d f or Fuzzy Co nt rolle r Desig n

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    中文文摘:通过分析对模糊控制器优化的原理,提出一种新的优化设计方法,通过引入等比因子,实现用三个参数调整输入、输出语言 变量的隶属函数,再通过遗传算法寻优包括量化和比例因子在内的这些参数,使得性能指标最大,从而使设计出的模糊控制 器性能更优。仿真结果表明,本文方法简单,有效。 英文文摘:A new optimization method for fuzzy controller design is proposed. The membership functions of input and output variables are defined by three parameters , called geometric proportional factors , adding with the scaling factors , which are adjusted to maximize the performance in2 dex by using the Genetic Algorithm. Therefore the fuzzy controller is designed to be more capability. The simulation result shows that this optimization method is simple and effective

    月湖底泥疏浚后底栖动物群落的恢复及其与环境的关系

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    研究对月湖底泥疏浚后底栖动物群落动态进行逐月的周年调查,并分析了底栖动物密度、生物多样性与环境因子的关系,结果表明:疏浚导致大型底栖动物基本消失,现存量从疏浚前的(4387±885)ind·m-2降低至(80±21)ind·m-2。疏浚后,寡毛类成为受干扰系统恢复过程中的先锋种类,在春季(4月)和秋冬之际(11月)出现2个密度高峰,分别为(1010±230)ind·m-2和(1538±408)ind·m-2,而摇蚊幼虫在疏浚一年后的秋冬季密度达到高峰(2021±612)ind·m-2,二者均基本恢复到疏浚前的密度水平。种类组成与疏浚前相似,优势种类数较疏浚前多,7月份以前,以霍甫水丝蚓占绝对优势,7月份以后以长足摇蚊占绝对优势。生物多样性在秋冬季恢复到疏浚前水平。寡毛类、摇蚊幼虫的密度、生物多样性与湖水溶氧、透明度呈显著正相关,与水体营养水平(TN、TP、有机碎屑)呈显著负相关(P<0.05)。分析认为疏浚后底栖动物群落的季节变化与动物的生命周期(繁殖和生长)密切相关,而营养水平不是限制动物种群密度分布的主要因子。从底栖动物群落的恢复情况来看,疏浚后的底质环境更有利于底栖动物群落的生存和底栖生态系统的重建

    材料科学与工程特色专业的建设与思考

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    2007年厦门大学“材料科学与工程“专业成为国家级“第二类特色专业建设点“。本文就从人才培养、课程体系、实践教学、师资队伍和人才培养质量等方面对该特色专业的建设进行了总结和阐述。教育部第二批高等学校特色专业建设点:材料科学与工程(教高函[2007]31号); 教育部“十二五”国家级实验教学示范中心:厦门大学材料科学与工程专业实验教学示范中心(教高函发不好[2012]13号); 福建省本科高校专业综合改革试点:材料科学与工程专业(闽教高[2012]41号

    生物离子分子组学计划( Bio-imOmics Project:BiP)

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    “imOmics 离子分子组学”是对生命与非生命物质与外界环境进行离子和分子交换过程的整体研究。依据研究的对象不同可以分为: • “非生物离子分子组学计划(Abiotic imOmics Project:AiP)” • “生物离子分子组学计划(Bio-imOmics Project:BiP)” 生物离子分子组学计划(Bio-imOmics Project:BiP)是利用现代NMT非损伤微测技术等活体离子分子检测技术,结合现代计算机人工智能等科技及生物信息学方法,对生物个体及其各层级组成与外部环境之间,以离子和分子形式进行能量和信息交换的过程,进行系统的、可量化的研究,从整体活体生理机制水平上拓展人类对生命现象的认知和利用
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