图书馆信息检索机安全配置策略

图书馆公共信息检索计算机在为读者提供高效、快捷的查询服务的同时,由于计算机系统的开放性和检索机用户的流动性,也面临许多安全隐患。为了解决检索机面临的安全问题,针对检索机的外部环境,采取了机柜保护、网络隔离措施。此外,在硬件方面,采取了配置硬盘数据保护及网络数据克隆设备的措施;在软件方面,采取了正确的安装、配置方式及详细的系统安全修改、设置、备份等一系列措施。最终制定出一套较为完整的安全维护策略,以应对检索机所面临的各类安全隐患。     

利用遗传编程排序图像

Web image retrieval is a challenging task. One central problem of web image retrieval is to rank a set of images according to how well they meet the user information need. The problem of learning to rank has inspired numerous approaches to resolve it in the text information retrieval, related work for web image retrieval, however, are still limited. We focus on the problem of learning to rank images for web image retrieval, and propose a novel ranking model, which employs a genetic programming architecture to automatically generate an effective ranking function, by combining various types of evidences in web image retrieval, including text information, image visual content features, link structure analysis and temporal information. The experimental results show that the proposed algorithms are capable of learning effective ranking functions for web image retrieval. Significant improvement in relevancy obtained, in comparison to some other well-known ranking techniques, in terms of MAP, NDCG@n and D@n.     

奇异值分解算法优化

奇异值分解算法在信号处理、图像处理、信息安全等领域均有重要应用.针对该算法存在的性能问题,提出了基于gamma:1驱动的数据重用模型,提高计算负载平衡性,降低数据通信量;给出基于多处理器的并行分解模型,数值试验均表明算法具有较高的并行加速比和效率.     

勘察CAD软件系统的实现

为实现工程中提出的短、平、快的工作方式,通过总结勘察内业工作中遇到的问题,依据勘察工作的流程,充分发挥AutoCAD的二次开发语言Autolisp的潜力,进行了勘察CAD软件系统的开发,在实际工程应用中显著提高了工作效率,降低了人工误差。     

TGO软件在多种测量成果需求中的应用

在某些测量工作中可能会需要同时提供多种类型或不同坐标系下的成果,如CGCS2000,1980西安坐标系,1954年北京坐标系或独立坐标系下的成果。文章结合实际应用从实用、高效的角度出发给出了具体的应用TGO软件方案。     

GW286计算中心微机管理系统

本文详述了如何在GW286微机上利用DBASEⅢ软件对学生上机进行管理,以及如何完成上机课程表的排列、打印各种统计报表;此外,还介绍了实现DBASEⅢ与其他高级语言相互调用的方法。     

基于故障树分析法的巷道堆垛机可靠性分析

以某烟厂自动化立体仓库系统中巷道堆垛机为研究对象,运用故障树分析法(FTA),建立了其关键部件的故障树分析法模型。通过对FTA模型最小割集的求解,得出巷道堆垛机不能正常工作的故障模式和关键故障因素;并根据某烟厂对于巷道堆垛机基本部件平均故障率的历史统计结果,对FTA模型进行了定量分析,计算出巷道堆垛机发生故障的概率,进而提出了改进措施和注意事项。结果表明,故障树分析法是研究烟厂物流设备可靠性问题的一种有效方法。     

Annotation and Retrieval System of CAD Models Based on Functional Semantics

CAD model retrieval based on functional semantics is more significant than content-based 3D model retrieval during the mechanical conceptual design phase. However, relevant research is still not fully discussed. Therefore, a functional semantic-based CAD model annotation and retrieval method is proposed to support mechanical conceptual design and design reuse, inspire designer creativity through existing CAD models, shorten design cycle, and reduce costs. Firstly, the CAD model functional semantic ontology is constructed to formally represent the functional semantics of CAD models and describe the mechanical conceptual design space comprehensively and consistently. Secondly, an approach to represent CAD models as attributed adjacency graphs（AAG） is proposed. In this method, the geometry and topology data are extracted from STEP models. On the basis of AAG, the functional semantics of CAD models are annotated semi-automatically by matching CAD models that contain the partial features of which functional semantics have been annotated manually, thereby constructing CAD Model Repository that supports model retrieval based on functional semantics. Thirdly, a CAD model retrieval algorithm that supports multi-function extended retrieval is proposed to explore more potential creative design knowledge in the semantic level. Finally, a prototype system, called Functional Semantic-based CAD Model Annotation and Retrieval System（FSMARS）, is implemented. A case demonstrates that FSMARS can successfully botain multiple potential CAD models that conform to the desired function. The proposed research addresses actual needs and presents a new way to acquire CAD models in the mechanical conceptual design phase.     

基于TRSAPI科技情报管理系统

本文简要介绍了TRS中英文信息发布检索平台，对以C＋Builder 3.0为前端开发工具的TRS API7编程做了详细说明。根据大庆油田科技情报管理的需要，以TRS作为数据库存管理系统，设计并实现了一个科技情报服务系统。     

Collaborative remembering in older adults: Age-invariant outcomes in the context of episodic recall deficits.

Rapidly growing research reveals complex yet systematic consequences of collaboration on memory in young adults, but much less is known about this phenomenon in older adults. Young and older adults studied a list of categorized words and took three successive recall tests. Test 1 and 3 were always taken individually, and Test 2 was done either in triads or alone. Despite older adults recalling less overall than young adults, both age groups exhibited similar costs and benefits of collaboration: Collaboration reduced both correct and false recall during collaborative remembering, was associated with more positive beliefs about its value, and produced reminiscence, collective memory, and some forgetting in its cascading effects on postcollaborative recall. We examine the role of retrieval organization in these effects. As environmental support may play a substantial role in healthy aging, the relatively preserved effects of collaboration on memory in older adults hold promise for testing judicious uses of group remembering in aging. (PsycINFO Database Record (c) 2011 APA, all rights reserved)