检索结果-南通市图书馆

Admissibilities of linear estimator in a class of linear models with a multivariate t error variable

在线全文

学校读者我要写书评

暂无评论

Science china mathematics 2010年第8期53卷 2011-2019页

作者： YANG GuoQing 1 & WU QiGuang 2 1 department of mathematics,tongji university,shanghai 200092,china 2 Institute of Systems Science,Academy of mathematics and Systems Science,Chinese Academy of Sciences,Beijing 100190,china 1. department of mathematics Tongji University Shanghai 200092 China2. Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

This paper discusses admissibilities of estimators in a class of linear models,which include the following common models:the univariate and multivariate linear models,the growth curve model,the extended growth curve model,the seemingly unrelated regression equations,the variance components model,and so *** is proved that admissible estimators of functions of the regression coefficient β in the class of linear models with multivariate t error terms,called as Model II,are also ones in the case that error terms have multivariate normal distribution under a strictly convex loss function or a matrix loss *** is also proved under Model II that the usual estimators of β are admissible for p 2 with a quadratic loss function,and are admissible for any p with a matrix loss function,where p is the dimension of β.

关键词： multivariate t distribution convex loss quadratic loss matrix loss admissible estimator

Proper holomorphic self-maps of smooth bounded Reinhardt domains in C^2

在线全文

学校读者我要写书评

暂无评论

Science china mathematics 2008年第1期51卷 93-100页

作者： CHEN ZhiHua~1 & PAN YiFei~(2,3+) 1 department of mathematics, tongji university, shanghai 200092, china 2 department of Mathematical Sciences, Indiana university-Purdue university Fort Wayne, Fort Wayne, IN 46805-1499, USA 3 School of mathematics and Information Sciences, Jiangxi Normal university, Nanchang 330022, china department of mathematics Tongji University Shanghai China department of Mathematical Sciences Indiana University-Purdue University Fort Wayne Fort Wayne USA School of mathematics and Information Sciences Jiangxi Normal University Nanchang China

It is proved that every proper holomorphic self-map of a smooth bounded Reinhardt domain in C^2 is an automorphism.

关键词： Reinhardt domain proper holomorphic maps

POISSON ALGEBRA STRUCTURES ON sp_(2■)(■_Q)WITH NULLITY m

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2007年第3期27卷 473-490页

作者：靳全勤佟洁 department of mathematics Tongji University

Noncommutative Poisson algebras are the algebras having both an associative algebra structure and a Lie algebra structure together with the Leibniz law. In this article,the noncommutative Poisson algebra structures on... 详细信息

关键词： Noncommutative Poisson algebras Leibniz law

Erds和Rousseau的一个图论计数引理推广

在线全文

学校读者我要写书评

暂无评论

同济大学学报（自然科学版） 2008年第7期36卷 999-1001页

作者：孙玉芹同济大学数学系

在Erds和Rousseau关于给定边数的图中所含子图为二部图Kn,n的一个计数定理的基础上,给出了m-部图情形的结论,它在m=2时比已有结论有些许改进.设自然数n≥2,证明了一个含有q条边的m-部图中至多可以诱导出A(m,n,q)个完全m-部图Km(n)作... 详细信息

在Erds和Rousseau关于给定边数的图中所含子图为二部图Kn,n的一个计数定理的基础上,给出了m-部图情形的结论,它在m=2时比已有结论有些许改进.设自然数n≥2,证明了一个含有q条边的m-部图中至多可以诱导出A(m,n,q)个完全m-部图Km(n)作为子图,其中A(m,n,q)=(m-1)(e qm-1)!nen22qmn/22mm-2(m-1)n/2.

关键词：计数引理完全m-部图子图

Convex quadratic programming relaxations for parallel machine scheduling with controllable processing times subject to release times

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2004年第9期 14-20页

作者： ZHANG Feng 1,2 *, CHEN Feng 3 and TANG Guochun 1,2 (1. department of mathematics, shanghai Second Polytechnic university, shanghai 201209, china 2. department of mathematics, tongji university, shanghai 200092, china 3. department of mathematics, shanghai university, shanghai 200436, china) department of mathematics，shanghai Second Polytechnic university，shanghai 201209，china department of mathematics Tongji University，Shanghai 200092，China department of mathematics，shanghai university，shanghai 200436，china

Scheduling unrelated parallel machines with controllable processing times subject to release times is investigated. Based on the convex quadratic programming relaxation and the randomized rounding strategy, a 2 approximation algorithm is obtained for a special case with the all or none property and then a 3 approximation algorithm is presented for general problem.

关键词： scheduling with controllable processing time release time quadratic programming approximation algorithm.

Uniqueness of limit cycles of quadratic system (Ⅲ) _(m=0)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1997年第8期42卷 628-631页

作者： ZHANG Xiang and YE Qin1.department of mathematics, Nanjing university, Nanjing 210093, china 2. department of Applied mathematics, tongji university, shanghai 200092, china

IN ref.[1]of § 20,Ye Yanqian has investigated the impossibility of（2,2）distribution of lim-it cycles of quadratic systems,where the footnote 1)on p.553 gives the following conjecture:The quadratic system（Ⅲ）m=0

关键词： quadratic system limit cycle uniqueness.

在线全文

学校读者我要写书评

暂无评论

二阶非线性积分微分方程的边值问题

同济大学学报（自然科学版） 2002年第8期30卷 1023-1025页

作者：付小芹张华隆中央财经大学数学部北京100081 同济大学应用数学系上海200092

将文献 [1]中Morchalo研究的边值问题的条件修改后进行了推广 ,并利用上、下解的方法证明了当F和K不依赖于x′(t)时。

关键词：非线性积分微分方程边值问题解唯一存在性上下解方法 Banach压缩映象原理

A New Quasi-filled Function Method for Nonlinear Integer Programming Problem

在线全文

学校读者我要写书评

暂无评论

A New Quasi-filled Function Method for Nonlinear Integer Pro...

求解非定常不可压Navier-Stokes方程的一种新方法

第九届中国青年信息与管理学者大会

作者： Youlin Shang~(1,2) Yanxia Niu~3 ~1College of Science,Henan university of Science and Technology,Luoyang 471003,china ~2Applied mathematics department,tongji university,shanghai 200092,china ~3mathematics department,Zhengzhou university,Zhengzhou 450001,china

＜正＞A new quasi-filled function for nonlinear integer programming is given in this *** quasi-filled function overcomes the numerical draw- back in previously *** properties of the proposed quasi-filled function and the algorithm using this new quasi-filled function to solve nonlinear inte- ger programming are also discussed in this ***- merical results of several testing functions show that this algorithm has better computability than previ- ously reported.

关键词： Integer programming Local minimizer Global minimizer Quasi-filled function Global optimization

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

同济大学学报（自然科学版） 2001年第11期29卷 1261-1265页

作者：魏金凤曾德顺黄自萍同济大学特种土木工程技术研究所上海200092 同济大学应用数学系上海200092

三次伪质点 (CIP)方法是有效求解广义双曲型偏微分方程的一种数值方法 ,将这种方法进行推广 ,应用到不可压Navier -Stokes(NS)方程的求解中 ,并以驱动方腔流作为算例 ,验证了此方法的可行性 .CIP方法作为一种显式格式求解不可压NS方程 ... 详细信息

三次伪质点 (CIP)方法是有效求解广义双曲型偏微分方程的一种数值方法 ,将这种方法进行推广 ,应用到不可压Navier -Stokes(NS)方程的求解中 ,并以驱动方腔流作为算例 ,验证了此方法的可行性 .CIP方法作为一种显式格式求解不可压NS方程 ,具有计算量小 ,程序易实现等特点 .

关键词：三次伪质点方法对流项非对流项非定常不可压NS方程显式格式广义双曲型偏微分方程驱动方腔流