以图画为本位的文学--图画书的演变史     

韩进 《出版科学》2016,24(5):5-12

中国原创图画书开始走向世界,但中国图画书的历史可能比西方更早。图画书本质上是一种出版现象,在中西方不同文化背景中有不同的呈现方式。中西方图画书同源于儿童读物的插图,随着出版科技的进步和读图时代的到来,从“出版热”逐渐形成“文学热”,从“文字的儿童读物”演化为“图画书的儿童文学”,在新世纪交流融合中发展为儿童文学的典型样式——绘本。中国原创图画书的复兴有其深刻的历史文化背景和深厚的民族文学传统,建设中国特色的图画书评价标准和理论体系应该提上议事日程。  相似文献   

Hybrid ants-like search algorithms for P2P media streaming distribution in ad hoc networks     

ZUO Dong-hong DU Xu YANG Zong-kai 《浙江大学学报(A卷英文版)》2007,8(8):1191-1198

Media streaming delivery in wireless ad hoc networks is challenging due to the stringent resource restrictions,po-tential high loss rate and the decentralized architecture. To support long and high-quality streams,one viable approach is that a media stream is partitioned into segments,and then the segments are replicated in a network and served in a peer-to-peer(P2P) fashion. However,the searching strategy for segments is one key problem with the approach. This paper proposes a hybrid ants-like search algorithm(HASA) for P2P media streaming distribution in ad hoc networks. It takes the advantages of random walks and ants-like algorithms for searching in unstructured P2P networks,such as low transmitting latency,less jitter times,and low unnecessary traffic. We quantify the performance of our scheme in terms of response time,jitter times,and network messages for media streaming distribution. Simulation results showed that it can effectively improve the search efficiency for P2P media streaming distribution in ad hoc networks.  相似文献   

刚性常微分方程的数值解法在化学动力学中的应用   总被引：1，自引：0，他引：1  

金翔秋  林娟娟 《温州职业技术学院学报》2003,3(2):46-49

解刚性常微分方程已成为复杂化学反应研究的重要途径，本介绍了化学动力学计算中的刚性问题和数值解法，并着重讨论常用的吉尔(Gear)法和半隐式龙格库塔(Semi-implicit Runge-Kutta)法及其在化学动力学中的应用。  相似文献   

基于电子商务的精确搜索引擎的研究与实现     

许建豪 《南宁职业技术学院学报》2011,(4):97-100

随着科技的发展,电子商务日益活跃。现行的电子商务打折网站与生俱来的局限性,越来越跟不上时代的步伐。能否开发一个能够收集全球打折信息的电子商务网站,越来越引起人们的重视。采用精确搜索引擎算法的电子商务精确搜索引擎模型,具有很好的精确性和响应速度,能够查询到精确而全面的打折信息,有较高的实用价值。  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   

基于遗传算法的高校试题组卷系统的研究     

张福泉 《河北职业技术学院学报》2011,(4)

阐述了高校组卷系统的原理,重点研究了作为系统关键的组卷策略运算过程,提出了一个改进的动态分层遗传算法作为高校组卷系统的组卷策略,最后通过实验检验其性能。  相似文献   

Improving the learning of Boolean queries by means of a multiobjective IQBE evolutionary algorithm     

O. Cordón  E. Herrera-Viedma  M. Luque 《Information processing & management》2006

The Inductive Query By Example (IQBE) paradigm allows a system to automatically derive queries for a specific Information Retrieval System (IRS). Classic IRSs based on this paradigm [Smith, M., & Smith, M. (1997). The use of genetic programming to build Boolean queries for text retrieval through relevance feedback. Journal of Information Science, 23(6), 423–431] generate a single solution (Boolean query) in each run, that with the best fitness value, which is usually based on a weighted combination of the basic performance criteria, precision and recall.  相似文献   

高校科技成果转化促进创新型人才培养演化博弈研究     

姜春  陈红喜 《科技管理研究》2020,40(13):183-188

运用演化博弈理论方法,基于创新型人才培养视角探索高校科技成果转化促进创新型人才培养的行为演化规律及稳定策略,结果表明,高校积极推动科技成果转化促进创新型人才培养是最优均衡策略选择,其中高校科技成果转化积极作用于创新型人才培养的成本与消极对待科技成果转化促进创新型人才培养行为所造成的损失是影响高校行为演化稳定策略的调节因素。因此,有必要从强化理念引领、激发企业主体和深化体制改革等方面来引导高校的行为向积极推动的方向演进。  相似文献   

Convergent designs in fine fashion: An evolutionary model for stylistic innovation     

Rossella Cappetta Author Vitae  Paola Cillo Author Vitae  Anna Ponti Author Vitae 《Research Policy》2006,35(9):1273-1290

In this paper we propose and test an evolutionary model of stylistic innovation, that is the change in the aesthetic and symbolic elements of products and services. Style is an increasingly relevant phenomenon in many industries and our goal is to develop a model of how styles get introduced and adopted. We build on existent literature on technological change to frame the dynamics of how style changes across time. In the model we propose, companies face periods of ferment with relevant stylistic variations and periods of convergence on a single trend—that is the stylistic convergent design versus the technologic dominant design. We identify the drivers of convergence in stylistic innovation. We test the model with a longitudinal empirical study (1984-2002) in the fine fashion industry, explaining the main differences between a stylistic and a technological evolutionary model.  相似文献   

遗传算法在股票投资技术分析中的应用     

冯平  宣慧玉 《预测》2001,20(2):38-41

本文首先分析了股票投资技术分析的特点,然后阐述了遗传算法及基于遗传算法的分类器系统的基本理论.最后,详细讨论了遗传算法及分类器系统在两种最常用的股票投资技术分析方法(指标分析和图形分析)的计算机化中的运用问题.  相似文献