Subdivision surface modeling system based on arbitrary topological curves network and combined subdivision     

何钢  朱灯林  李堑  张敏 《上海大学学报(英文版)》2011,15(6)

Arbitrary topological curve network has no restriction in topology structure,so it has more powerful representing ability in defining complex surfaces.A complex surface modeling system is presented based on arbitrary topological curve network and the improved combined subdivision method,its functions including creating and editing curve network,and generating and modifying curve network's interpolated surface.This modeling system can be used to the process of products'concept design,and its applications is ...  相似文献   

FARMER: A novel approach to file access correlation mining and evaluation reference model     

夏鹏  冯丹  王芳 《上海大学学报(英文版)》2011,15(6):574-588

File semantic has proven effective in optimizing large scale distributed file system. As a consequence of the elaborate and rich I/O interfaces between upper layer applications and file systems, file system can provide useful and insightful information about semantic. Hence, file semantic mining has become an increasingly important practice in both engineering and research community. Unfortunately, it is a challenge to exploit file semantic knowledge because a variety of factors could affect this information exploration process. Even worse, the challenges are exacerbated due to the intricate interdependency between these factors, and make it difficult to fully exploit the potentially important correlation among various semantic knowledges. This article proposes a file access correlation miming and evaluation reference (FARMER) model, where file is treated as a multivariate vector space, and each item within the vector corresponds a separate factor of the given file. The selection of factor depends on the application, examples of factors are file path, creator and executing program. If one particular factor occurs in both files, its value is non-zero. It is clear that the extent of inter-file relationships can be measured based on the likeness of their factor values in the semantic vectors. Benefit from this model, FARMER represents files as structured vectors of identifiers, and basic vector operations can be leveraged to quantify file correlation between two file vectors. FARMER model leverages linear regression model to estimate the strength of the relationship between file correlation and a set of influencing factors so that the “bad knowledge” can be filtered out. To demonstrate the ability of new FARMER model, FARMER is incorporated into a real large-scale object-based storage system as a case study to dynamically infer file correlations. In addition FARMER-enabled optimize service for metadata prefetching algorithm and object data layout algorithm is implemented. Experimental results show that is FARMER-enabled prefetching algorithm is shown to reduce the metadata operations latency by approximately 30%–40% when compared to a state-of-the-art metadata prefetching algorithm and a commonly used replacement policy.  相似文献   

Overall plan and design of the task management system of ternary optical computer     

宋凯  金翊 《上海大学学报(英文版)》2011,15(5):467-472

In this paper an overall scheme of the task management system of ternary optical computer (TOC) is proposed, and the software architecture chart is given. The function and accomplishment of each module in the system are described in general. In addition, according to the aforementioned scheme a prototype of TOC task management system is implemented, and the feasibility, rationality and completeness of the scheme are verified via running and testing the prototype.  相似文献   

Implementation of advanced peripheral bus interface for MV1O MCU     

HU Yue-li  HUANG Jun-liang  ZHOU Jun 《上海大学学报(英文版)》2011,15(4)

MV10 is an MCU which consists of PWM,ADC,CAN and some other function blocks.It is designed for car body's control.Advanced peripheral bus (APB) is a low speed AMBA bus connecting low-power peripherals.This paper presents an implementation of APB interface for MV10 MCU.After that,MV10 can be integrated into any AMBA system on chips (SoCs) easily.We have built a multi-core system with ABMA to verify this design.In this system ARM9 is a main processor mounted on AHB and MV10 acts as a low-power and low-speed slaver on APB.Before building this system,some operations are encapsulated into a task with dedicated ID.MV10 works as a co-processor with ARM by acquiring task ID from ARM.The result of simulation indicates that MCU can work well as expected.Based on our design,MV10 can be mounted on any AMBA system from now on.  相似文献   

Global existence and blow-up of solutions to reaction-diffusion system with a weighted nonlocal source     

蒋良军  王悦生 《上海大学学报(英文版)》2011,15(6):501-505

In this paper, we study a semi-linear reaction-diffusion system with a weighted nonlocal source, subject to the null Dirichlet boundary condition. Under certain conditions, we prove that the classical solution exists globally and blows up in finite time respectively, and then obtain the uniform blow-up rate in the interior.  相似文献   

中国的城市化与土地制度改革   总被引：1，自引：0，他引：1  

蔡继明 《徐州师范大学学报(哲学社会科学版)》2011,37(4):131-135

我国宪法一方面规定城市的土地归国家所有,农村的土地归集体所有,这就意味着无论是公益性还是非公益性土地需求,都必须通过国家的征地行为来满足,必须先变成国有;另一方面《宪法》又明确表明,国家只有出于公共利益的需要,才能对农地进行征收或者征用。现行征地制度中存在着这个二律背反,应进一步创新和完善城市国有土地制度改革和农村集体土地制度改革的基本思路,尤其要重视研究解决城乡建设用地增减挂钩中土地增值的分配、城市化与土地适度规模经营以及农民增收的关系、城乡宅基地同权同价以及粮食安全责任分摊等问题。  相似文献   

导师负责制下隐性知识转移的模式及关键因素     

崔慧广 《教育与现代化》2011,(4):46-51

隐性知识转移是保障研究生培养质量的关键环节。导师负责制中师生隐性知识的转移分为伪隐性知识和真隐性知识的转移,伪隐性知识的转移可以使用语言知识或符号规则编码进行,真隐性知识的转移只能在特定情境中以联结学习的方式进行。基于此,本文构建了伪隐性知识转移的编码———诠释模型,提出了真隐性知识转移的触发模型,探讨了导师负责制中促使隐性知识转移的关键因素。  相似文献   

我国研究生资助体制演进的研究     

李秀兵  程洁  武欣 《教育与现代化》2011,(5):25-30

介绍新中国成立以来我国研究生资助体制的演进过程,指出新中国六十年中,我国的研究生资助方式和资助力度均发生了很大的变化,从单一的助学金模式发展为“奖、助、贷、补”多元化叠加模式;从完全免费教育,到部分免费教育,资助力度呈现下降态势。研究生学习阶段的机会成本增大,研究生贫困化现象日渐严重,这将不利于“建设人才资源强国”战略目标的实现。  相似文献   

依托自学考试制度构建国家继续教育学分银行   总被引：3，自引：0，他引：3  

王海东  刘素娟 《开放教育研究》2011,17(3)

要改变我国继续教育领域整体薄弱、各种教育形式自成体系、互不沟通的状况,惟有不断深化改革、创新机制和体制.文章首先对我国继续教育发展状况和主要问题进行简要概述,接着提出国家学分银行的理论框架以及国际经验借鉴,继而重点分析了依托自学考试制度构建国家学分银行的基础条件及不足,最后对国家继续教育学分银行制度的建设思路提出了一些建议.  相似文献   

在线学习管理系统中本科生与研究生交互比较研究(英文)     

张爱萍 《开放教育研究》2011,17(2)

学习者与在线内容的交互被认为是决定网络教学和学习有效性的重要因素之一.学习环境中的任何事情总是一触即发,支持学习者与在线内容进行交互.当学习者与内容交互时,内部的反思性思考与对话发生了.本研究试图比较在线学习管理系统中研究生课程和本科课程中学习者交互之间的差别.基于所提出的研究学习者与在线内容交互的框架,研究者收集了学习管理系统日志和学习活动数据库中的相关数据;基于学习者与在线课程内容的交互模式和行为对收集到的数据进行了分析;并对教师和学习者在在线论坛中的讨论和交流的内容进行分析,尤其调查了已发生的交流的维度、深度和分类.基于上述研究成果.研究者认为应该加强网络内容的设计和传输,从而提升开放远程学习中在线学习环境的有效性.  相似文献