following are the main results of this thesis : 1 detailedly analyze some related schemes concerning group key management and authentication, especially logical key hierarchy ( lkh ) and one-way function tree ( oft ) . we point out the reasons that oft fails to provide forward and backward security 本论文基于这两个方面,主要研究成果如下:对目前存在的多播组密钥管理方案进行了详细的研究分析,尤其是逻辑密钥分层(lkh)和单向函数树(oft)方案,并给出oft方案不能前向保密和后向保密的依据。
in order to build the function model for the mold enterprise, according to the idefo method, functions of the mold enterprise were divided from top to bottom, and the function trees such as the management function tree, the technology function tree and the manufacturing function tree were established respectively . based on those trees, the top-layer idefo function graph, o-layer idefo function graph, etc . were set up, in order to build the information model, following processes had been done : 1 郑州大学硕士学位论文按照idefo方法,本文首先将模具企业自顶向下按递阶层次进行功能分解,划分为经营管理、工程技术分析与模具制作三方面,对这三个方面进行分析与细分后,可以分别得到其功能模型功能树图,对各功能树继续采用idefo方法,可以绘制出包括企业功能模型顶层idefo图、企业功能模型0层idefo图等各级功能模型图,从而完成系统功能模型的建立。
in order to build the function model for the mold enterprise, according to the idefo method, functions of the mold enterprise were divided from top to bottom, and the function trees such as the management function tree, the technology function tree and the manufacturing function tree were established respectively . based on those trees, the top-layer idefo function graph, o-layer idefo function graph, etc . were set up, in order to build the information model, following processes had been done : 1 郑州大学硕士学位论文按照idefo方法,本文首先将模具企业自顶向下按递阶层次进行功能分解,划分为经营管理、工程技术分析与模具制作三方面,对这三个方面进行分析与细分后,可以分别得到其功能模型功能树图,对各功能树继续采用idefo方法,可以绘制出包括企业功能模型顶层idefo图、企业功能模型0层idefo图等各级功能模型图,从而完成系统功能模型的建立。
in order to build the function model for the mold enterprise, according to the idefo method, functions of the mold enterprise were divided from top to bottom, and the function trees such as the management function tree, the technology function tree and the manufacturing function tree were established respectively . based on those trees, the top-layer idefo function graph, o-layer idefo function graph, etc . were set up, in order to build the information model, following processes had been done : 1 郑州大学硕士学位论文按照idefo方法,本文首先将模具企业自顶向下按递阶层次进行功能分解,划分为经营管理、工程技术分析与模具制作三方面,对这三个方面进行分析与细分后,可以分别得到其功能模型功能树图,对各功能树继续采用idefo方法,可以绘制出包括企业功能模型顶层idefo图、企业功能模型0层idefo图等各级功能模型图,从而完成系统功能模型的建立。
in order to build the function model for the mold enterprise, according to the idefo method, functions of the mold enterprise were divided from top to bottom, and the function trees such as the management function tree, the technology function tree and the manufacturing function tree were established respectively . based on those trees, the top-layer idefo function graph, o-layer idefo function graph, etc . were set up, in order to build the information model, following processes had been done : 1 郑州大学硕士学位论文按照idefo方法,本文首先将模具企业自顶向下按递阶层次进行功能分解,划分为经营管理、工程技术分析与模具制作三方面,对这三个方面进行分析与细分后,可以分别得到其功能模型功能树图,对各功能树继续采用idefo方法,可以绘制出包括企业功能模型顶层idefo图、企业功能模型0层idefo图等各级功能模型图,从而完成系统功能模型的建立。
function event tree: 功能事件树a tree: 树状; 一棵树; 一蔸树in a tree: 在树上in the tree: 在树上(非树本身)in tree: 内树型; 入树into tree: 放在树中on the tree: 长在树上的,如果实一类的。; 在树上(本身生出的); 在树上(果实等)or tree: 或树s tree: 无私奉献的树tree: n. 特里〔姓氏〕。 n. 1.树〔主要指乔木,也可指较大的灌木〕。 ★玫瑰可以称为 bush, 也可以称为 tree. 2.木料,木材;木构件;〔古语〕绞首台;〔the tree〕(钉死耶稣的)十字架;鞋楦。 3.树形(物),世系图,家系 (=family tree);【数学】树(形);【化学】树状晶体。 a banana tree 香蕉树。 an axle-tree 心棒,轴料。 a boot-tree 靴楦[型]。 a saddle-tree 鞍架。 at the top of the tree 在最高地位。 tree of Buddha 菩提树。 tree of heaven 臭椿。 tree of knowledge (of good and evil) 【圣经】知道善恶的树,智慧之树。 tree of life 生命之树,生命力的源泉【植物;植物学】金钟柏。 up a tree 〔口语〕进退两难,不知所措。 vt. 赶(猎兽等)上树躲避;〔口语〕使处于困境;穷追;把鞋型插入(鞋内)。 a function: 绝对函数and function: “与”功能; 及函数; 与酌; 与作用and to or function: 或作用; 与-或"作用and-function: "与"作用function: n. 1.功能,官能,机能,作用。 2.〔常 pl.〕职务,职责。 3.庆祝仪式;(盛大的)集会,宴会。 4.【数学】函数;与其他因素有密切关系的事。 The function of the ear is to listen. 耳的功能是听。 the function of education 教育的功能。 discharge one's functions 尽职。 the functions and powers of the National Congress 全国代表大会的职权。 a controllable function【火箭】遥控程序。 public [social] function招待会,文娱晚会,社交集会。 vital functions 生命机能。 vi. (器官等)活动,(机器等)运行,发挥作用。 function as teacher 担任教师。 a sofa functioning as a bed 兼当床用的沙发。 The lathe doesn't function well. 这台车床有毛病。 function digit [letter] 【计算机】操作数码[字码]。 function of: function迭函数; function合成函数; 元函数no function: 不动作(动作迟钝)not function: "非"作用; 非门; 非逻辑操作非功能; 逻辑"非"函数; 逻辑“非”函数not-function: 非功能or function: "或"操作, "或"功能; “或”逻辑函数; 或功能s function: 轴功能t function: 统计系数于标准误差比率avenue tree, street tree: 行道树dependency tree, dependent tree: 依存关系树embedding of tree in another tree: 一树嵌入另一树中