检索结果-南通市图书馆

Turbo-Based DNW Algorithm for Compressed Video in VLC Domain

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2005年第1期10卷 297-302页

作者： LINGHe-fei luzheng-ding ZOUFu-hao CollegeofComputerScienceandTechnology HuazhongUniversityofScienceandTechnologyWuhan430074HubeiChina

In order to improve the robustness of the differential number watermarking (DNW) algorithm proposed by us before, we proposed turbo-based DNW (T-DNW) in which the turbo code was employed in the DNW algorithm. The turbo code was used to encode the message prior to watermark embedding and decode the watermark posterior to watermark detection. From the analysis and experiments, the following conclusion could be drawn. The T-DNW algorithm has little higher computational complexity than DNW. And both algorithms have the same performance in terms of watermark visual quality impact. Furthermore, the T-DNW algorithm is much more robust against some common attack than DNW. Although the T-DNW algorithm sacrifices a half payload, we think the achievements are encouraging.

关键词： real time video watermarking Turbo based DNW (T DNW) VLC domain

A Dynamic XML-NS View Based Approach for the Extensible Integration of Web Data Sources

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2004年第5期9卷 647-651页

作者： WUWei luzheng-ding LIRui-xuan WANGZhi-gang SchoolofComputerScienceandTechnology.HuazhongUniversityofScienceandTechnology Wuhan430071Hubei.China

We propose a three-step technique to achieve this purpose. First, we utilize a collection of XML namespaces organized into hierarchical structure as a medium for expressing data semantics. Second, we define the format of resource descriptor for the information source discovery scheme so that we can dynamically register and/or deregister the Web data sources on the fly. Third, we employ an inverted-index mechanism to identify the subset of information sources that are relevant to a particular user query. We describe the design, architecture, and implementation of our approach—IWDS, and illustrate its use through case examples. Key words integration - heterogeneity - Web data source - XML namespace CLC number TP 311.13 Foundation item: Supported by the National Key Technologies R&D Program of China(2002BA103A04)Biography: WU Wei (1975-), male, Ph.D candidate, research direction: information integration, distribute computing

关键词： integration heterogeneity Web data source XML namespace

TrustedRBAC——A Distributed Authorization Infrastructure Span Multiple Autonomous Domains

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2004年第5期9卷 694-698页

作者： WANGZhi-gang luzheng-ding LIRui-xuan WUWei WANGXiao-gang CollegeofComputerScienceandTechnology.HuazhongUniversityofScienceandTechnology.Wuhan130071.Hubei.China

TrustedRBAC is a scalable, decentralized trust-management and access control mechanism for systems that span multiple autonomous domains. We utilize X.509 attri- bute certificates to define trust domains, roles to define controlled activities, and role delegation across domains to represent permissions to these activities. This paper describes the TrustedRBAC model and its scalable design and implementation.

关键词： X.509 attribute certificate RBAC authorization virtual enterprise

Integrating XML with CORBA-Based Multidatabase Systems

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2004年第5期9卷 676-680页

作者： LIRui-xuan luzheng-ding WUWei XIAOWei-jun CollegeofComputerScienceandTechnology HuazhongUniversityofScienceandTechnology.Wuhan430074Hubei.China

In this paper, we first introduce the architecture for a CORBA-based multidatabase system and then give an approach of schema mapping between XML and relational database system. Finally, we investigate the ability to apply the integration of XML with CORBA-based multidatabase systems. This integration extends the ability of a CORBA-based multidatabase system to implement data sharing and interoperability. Key words heterogeneity - XML - schema mapping - multidatabase systems CLC number TP311. 13 Foundation item: Supported by the National Key Technologies R&D Program of China(2002BA103A04)Biography: LI Rui-xuan(1974-), male, Ph. D candidate, research interests: heterogeneous information integration.

关键词： heterogeneity XML schema mapping multidatabase systems

Web-Based Information Systems and Applications: A Survey

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2004年第5期9卷 537-541页

作者： XUBao-wen XULei MENGXiao-feng YUGe luzheng-ding HEYan-xiang SHENJun-yi DepartmentofComputerScienceandEngineering.SouthcastUniversity Nanjing210096Jiangsu.China SchoolofInformation.RcnminUniversityofChina.Beijing100872.China DepartmentofCoral.raterScience NorflieasternUniversityShenyang110001.LiaoningChina CollegeofComputerScienceandTechnology HuazhongUniversityofScienceandTechnology.Wuhan130074Hubei.China SchoolofComputer WuhanUniversityWuhan.130072HubeiChina SchoolofElectronicsandInformationEngineering Xi＇anJiaotongUniversityXi＇an710049Shaanxi.China

Biography: XU Bao-wen(1961-), male, Ph.D. Professor, research direction: programming language, software engineering, Web-based technology, etc.

关键词： Web WWW 信息系统因特网数据管理

Astragalus membranaceus(Fisch.)*** by dissolving microneedles achieves systemic therapeutic effects at low doses Author links open overlay panel

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medical Sciences 2024年第3期11卷 340-350页

作者： Yiwen Chen Zihan Zhou luzheng Zhang Zifan ding Pengyue Li Cong Yan School of Life Sciences Beijing University of Chinese MedicineBeijing 102488China Dongzhimen Hospital Beijing University of Chinese MedicineBeijing 100029China School of Chinese Materia Medica Beijing University of Chinese MedicineBeijing 102488China

Objective:To determine the main components of Astragalus membranaceus(Fisch.)Bge(***,Huang Qi),Astragaloside IV(AIV)and Astragalus polysaccharides(AP),to characterize their properties,evaluate their in vivo efficacy,and to analyze drug diffusion using dissolving microneedle(DMN)technology in ***: Respectively,AIV-and AP-loaded DMNs comprising chitosan(CTS)and polyvinyl alcohol(PVA)were prepared via dual-mold *** morphology,mechanical properties,in vivo solubility,and skin irritation characteristics were *** vivo efficacy was assessed in cyclophosphamide-induced immunosuppressed mice,in vivo diffusion of AIV and AP by DMNs and conventional methods was compared,and the rheological properties of AIV-CTS-PVA and AP-CTS-PVA mixtures were ***: Subcutaneous dissolution and absorption of AIV-CTS-PVA and AP-CTS-PVA microneedles(MNs)at low doses(50%–17%of intraperitoneal AIV injection and 12%–4%of intravenous AP injection)reduced the spleen index and acid phosphatase activity in immunosuppressed mouse models,increased the thymus index,and achieved equivalent or better systemic therapeutic *** with injections,AIV and AP achieved controllable solid-liquid conversion through delivery with CTS-PVA MNs,resulting in highly localized aggregation within 48 h,reducing the initial explosive effect of the drug,and achieving stable and slow drug ***: The present study enhances our understanding of the efficacy and remote effects of drug-loaded DMNs from a traditional Chinese medicine(TCM)perspective,thereby promoting the development of precise and efficient delivery of TCM and further expanding the drug-loading range and application scenarios for DMNs.

关键词： Dissolving microneedle Astragaloside IV Astragalus polysaccharides In vivo diffusion Rheological properties Acupuncture Immunosuppression Drug delivery

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

生物基抗菌水凝胶研究进展

复合材料学报 2023年第9期40卷 4972-4984页

作者：戎旭辉陈鲁正娄江丁大森韩文佳齐鲁工业大学(山东省科学院)生物基材料与绿色造纸国家重点实验室济南250353 山东国瓷功能材料股份有限公司东营257092

致病微生物所引起的感染一直以来都威胁着全世界人类的健康,抗菌材料在某种情况下可以被视为抗生素的替代品,其中抗菌水凝胶就是一类重要的高分子抗菌材料。生物基抗菌水凝胶根据基体种类不同主要分为壳聚糖基、纤维素基、淀粉基、海藻... 详细信息

致病微生物所引起的感染一直以来都威胁着全世界人类的健康,抗菌材料在某种情况下可以被视为抗生素的替代品,其中抗菌水凝胶就是一类重要的高分子抗菌材料。生物基抗菌水凝胶根据基体种类不同主要分为壳聚糖基、纤维素基、淀粉基、海藻酸钠基、蛋白质基等,这些基质在自然界具有高丰度,生物相容性及生物可降解性的优点,是制备抗菌水凝胶的理想材料。本文综述了近年来生物基抗菌水凝胶的发展现状及应用领域,着重从生物基抗菌水凝胶的种类、制备和应用3个方面来阐述,最后对生物基抗菌水凝胶所面临的挑战及未来的发展趋势进行了总结和展望。

关键词：抗菌材料生物基复合材料水凝胶抗菌功能敷料

在线全文

学校读者我要写书评

暂无评论

云南某钒钛磁铁矿选矿新工艺研究

矿业研究与开发 2015年第2期35卷 52-55页

作者：张惠芬陈禄政丁利饶荣军云南锡业职业技术学院云南个旧市661000 复杂有色金属资源清洁利用国家重点实验室昆明理工大学云南昆明650093 峨山昆钢矿产业有限公司云南玉溪市653100

针对云南某钒钛磁铁矿试样中钒钛磁铁矿和钛铁矿分别呈粗、细粒分布并含有大量弱磁性金云母的特点,采用"磨矿-弱磁选铁-高梯度磁选、螺旋溜槽粗选-钛粗精矿细磨-弱磁选铁-高梯度磁选、摇床精选钛"新工艺,获得铁品位和V2O5品位分别为65.... 详细信息

针对云南某钒钛磁铁矿试样中钒钛磁铁矿和钛铁矿分别呈粗、细粒分布并含有大量弱磁性金云母的特点,采用"磨矿-弱磁选铁-高梯度磁选、螺旋溜槽粗选-钛粗精矿细磨-弱磁选铁-高梯度磁选、摇床精选钛"新工艺,获得铁品位和V2O5品位分别为65.97%和0.93%的钒钛磁铁矿精矿,铁回收率和V2O5回收率分别为54.98%和57.75%,及Ti O2品位和Ti O2回收率分别为42.26%和31.19%的钛精矿,为该类矿产资源的开发利用奠定了技术基础。

关键词：钒钛磁铁矿弱磁选高梯度磁选重选

在线全文

学校读者我要写书评

暂无评论

棒介质组合方式对脉动高梯度磁选效果的影响

金属矿山 2015年第3期44卷 161-164页

作者：曾剑武陈禄政丁利张惠芬复杂有色金属资源清洁利用国家重点实验室云南昆明650093 昆明理工大学国土资源工程学院云南昆明650093 云南锡业职业技术学院国土资源系云南个旧661000

为了客观、全面、准确了解不同直径棒介质丝组合而成的组合式棒介质及单一直径棒介质对高梯度磁选效果的影响,基于"单元介质"分析法,采用SLon-100周期式脉动高梯度磁选机对铁品位为38.10%的赤铁矿石进行了选矿试验。结果表明,3+2 mm组... 详细信息

为了客观、全面、准确了解不同直径棒介质丝组合而成的组合式棒介质及单一直径棒介质对高梯度磁选效果的影响,基于"单元介质"分析法,采用SLon-100周期式脉动高梯度磁选机对铁品位为38.10%的赤铁矿石进行了选矿试验。结果表明,3+2 mm组合棒介质(上8层3 mm棒介质+下8层2 mm棒介质)既有利于对粗粒级的回收,对细粒级的回收效果也不错,因而对全粒级的回收效果较理想;相同类型棒介质丝的组成方式不同分选效果差异较大,因此,最佳排列组合方式应通过试验确定。

关键词：脉动高梯度磁选组合式棒介质排列组合优化赤铁矿