检索结果-南通市图书馆

CLS-Miner: efficient and effective closed high-utility itemset mining

Frontiers of Computer Science 2019年第2期13卷 357-381页

作者： Thu-lan DAM Kenli Li Philippe FOURNiER-ViGER Quang-Huy DUONG College of Computer Science and electronic engineering Hunan University Changsha 410082 China Faculty of information Technology Hanoi University of Industry Hanoi Vietnam CiC of HPC National University of Defense Technology Changsha 410073 China national Supercomputing Center in Changsha Changsha 410082 China School of Natural Sciences and Humanities Harbin Institute of Technology Shenzhen Graduate School Shenzhen 518055 China department of Computer Science Norwegian University of Science and Technology Trondheim Norway

High-utility itemset mining (HUiM) is a popular data mining task with applications in numerous domains. However, traditional HUiM algorithms often produce a very large set of high-utility itemsets (HUis). As a result, analyzing HUis can be very time consuming for users. Moreover, a large set of HUis also makes HUiM algorithms less efficient in terms of execution time and memory consumption. To address this problem, closed high-utility itemsets (CHUis), concise and lossless representations of all HUis, were proposed recently. Although mining CHUis is useful and desirable, it remains a computationally expensive task. This is because current algorithms often generate a huge number of candidate itemsets and are unable to prune the search space effectively. in this paper, we address these issues by proposing a novel algorithm called CLS-Miner. The proposed algorithm utilizes the utility-list structure to directly compute the utilities of itemsets without producing candidates. it also introduces three novel strategies to reduce the search space, namely chain-estimated utility co-occurrence pruning, lower branch pruning, and pruning by coverage. Moreover, an effective method for checking whether an itemset is a subset of another itemset is introduced to further reduce the time required for discovering CHUis. To evaluate the performance of the proposed algorithm and its novel strategies, extensive experiments have been conducted on six benchmark datasets having various characteristics. Results show that the proposed strategies are highly efficient and effective, that the proposed CLS-Miner algorithm outperforms the current state-ofthe- art CHUD and CHUi-Miner algorithms, and that CLSMiner scales linearly.

关键词： utility mining high-utility itemset mining closed itemset mining closed high-utility itemset mining

来源：

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

Thermal transport in organic/inorganic composites

引用

Frontiers in Energy 2018年第1期12卷 72-86页

作者： Bin LiU lan DONG Qing Xi Xiangfan XU Jun ZHOU Baowen Li Center for Phononics and Thermal Energy Science china-EU JointCenter for Nanophononics Shanghai Key Laboratory of SpecialArtificial Microstructure Materials and Technology School of PhysicsScience and Engineering Tongji University Shanghai 200092 China department of Mechanical engineering University of ColoradoBoulder CO 80309 USA

Composite materials, which consist of organic and inorganic components, are widely used in various fields because of their excellent mechanical properties, resistance to corrosion, low-cost fabrication, etc. Thermal properties of organic/inorganic composites play a crucial role in some applications such as thermal interface materials for micro-electronic packaging, nano-porous materials for sensor development, thermal insulators for aerospace, and high-performance thermoelectric materials for power generation and refrigeration. in the past few years, many studies have been conducted to reveal the physical mechanism of thermal transport in organic/ inorganic composite materials in order to stimulate their practical applications. in this paper, the theoretical and experimental progresses in this field are reviewed. Besides, main factors affecting the thermal conductivity of organic/ inorganic compositcs are discussed, including the intrinsic properties of organic matrix and inorganic fillers, topolo- gical structure of composites, loading volume fraction, and the interfacial thermal resistance between fillers and organic matrix.

关键词： thermal conductivity organic/inorganic com-posites effective medium theory thermal percolationtheory interfacial thermal resistance

来源：

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

3D electronic and photonic structures as active biological interfaces

引用

infoMat 2020年第3期2卷 527-552页

作者： Huachun Wang Pengcheng Sun lan Yin Xing Sheng department of electronic engineering Beijing National Research Center for Information Science and TechnologyTsinghua UniversityBeijingChina iDG/McGovern institute for Brain Research Tsinghua UniversityBeijingChina School of Materials Science and engineering Tsinghua UniversityBeijingChina

Biocompatible materials and structures with three-dimensional(3D)architectures establish an ideal platform for the integration of living cells and tissues,serving as desirable interfaces between biotic and abiotic *** conventional 3D bioscaffolds provide a mechanical support for biomatters,emerging developments of micro-,nano-,and mesoscale electronic and photonic devices offer new paradigms in analyzing and interrogating *** this review,we summarize recent advances in the development of 3D functional biointerfaces,with a particular focus on electrically and optically active materials,devices,and *** first give an overview of representative methods for manufacturing 3D biointegrated structures,such as chemical synthesis,microfabrication,mechanical assembly,and 3D ***,exemplary 3D nano-,micro-,and mesostructures based on various materials,including semiconductors,metals,and polymers are ***,we highlight the latest progress on versatile applications of such active 3D structures in the biomedical field,like cell culturing,biosignal sensing/modulation,and tissue *** believe future 3D micro-,nano-,and mesostructures that incorporate electrical and/or optical functionalities will not only profoundly advance the fundamental studies in biological sciences,but also create enormous opportunities for medical diagnostics and therapies.

关键词： 3D structures biointerfaces electronics photonics

来源：

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

Engine universal characteristic modeling based on improved ant colony optimization

引用

international Journal of Agricultural and Biological engineering 2015年第5期8卷 26-35页

作者： Chen Fuen Jiang Shihui Xie Xin Chen Longhan lan Yubin School of electronic and information engineering Beijing Jiaotong UniversityBeijing 100044China department of Mechanical engineering Oakland UniversityRochesterMI 48309USA College of engineering South China Agricultural UniversityGuangzhou 510642China

There have been some mathematics methods to model farm vehicle engine universal characteristic mapping(EUCM).Nevertheless,any of different mathematics methods used would possess its own strengths and *** a result,these modeling methods about EUCM are not the same among the most vehicle *** order to obtain a better robustness EUCM,an improved ant colony optimization was introduced into a traditional cubic surface regression method for modeling *** on this method,the test data were regressed into a three-dimensional cubic surface,after that it was cut by some equal specific fuel consumption(ESFC)planes,more than twenty two-dimensional ESFC equations were ***,the engine speed in every ESFC equation was discretized to obtain a set of ESFC points,and this set of ESFC points was linked into a closed curve by a given sequence via the improved ant colony *** order to improve the modeling speed,dimensionality reduction and discretization methods were *** addition,a corresponding simulation platform was also developed to obtain an optimal system *** were 48000 simulation search tests carried out on the platform,and the major parameters of the algorithm were *** this way the EUCM was established *** contrast with other methods,as a result of the application of the novel bionic intelligent algorithm,it has better robustness,less distortion and higher calculating speed,and it is available for both gasoline engines and diesel engines.

关键词： engines universal characteristics improved ant colony algorithm genetic algorithm cubic surface regression

来源：

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

小型企业的intranet的实现方法

引用

上海第二工业大学学报 2001年第2期18卷 57-60页

作者：朱刚黄江巍马文新上海第二工业大学电子电气工程系上海200041

本文介绍了用BackOffice建立intranet的方法。针对小型企业提出一种投资少,见效快的方案,并给出了一个具体使用的实例。

关键词： BackOffice intranet 局域网企业内部网 TCP/iP协议 Web浏览防火墙

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

白花丹素抑制非小细胞肺癌细胞增殖的研究

引用

中华介入放射学电子杂志 2024年第2期12卷 120-125页

作者：梁美斯兰慧敏于婷李胜桥中山大学第五附属医院肿瘤中心中医肿瘤科广东珠海519000 广东省分子成像工程技术研究中心

目的探讨白花丹素抑制非小细胞肺癌(non-small cell lung cancer,NSCLC)的临床疗效。方法通过CCK-8实验检测白花丹素对LLC1细胞增殖的影响。同时构建Lewis肺癌模型,评估白花丹素对小鼠皮下肿瘤的治疗效果及其生物安全性。结果CCK-8实验... 详细信息

目的探讨白花丹素抑制非小细胞肺癌(non-small cell lung cancer,NSCLC)的临床疗效。方法通过CCK-8实验检测白花丹素对LLC1细胞增殖的影响。同时构建Lewis肺癌模型,评估白花丹素对小鼠皮下肿瘤的治疗效果及其生物安全性。结果CCK-8实验结果表明,白花丹素可显著抑制LLC1细胞的增殖且呈现出时间依赖性和浓度依赖性。其作用机制与细胞凋亡和铁死亡相关。在Lewis肺癌模型中,与对照组相比,白花丹素治疗组具有更强的抗肿瘤作用。苏木精-伊红染色法结果显示,与对照组相比,白花丹素治疗后肿瘤组织内细胞核破裂增加,组织坏死面积扩大。结论细胞实验和动物实验均证实了白花丹素抑制NSCLC细胞的生长与增殖,且这种抑制作用与细胞凋亡和铁死亡相关。这为白花丹素治疗NSCLC提供了临床前依据。

关键词：白花丹素非小细胞肺癌铁死亡凋亡

来源：

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

虚拟专用网中虚拟拨号的客户端实现

引用

计算机工程 2000年第7期26卷 108-110页

作者：熊天放张健杨宇航上海交通大学电子工程系上海200030

虚拟专用网是一种有着广泛应用前景的技术，其中Ｃｌｉｅｎｔ－ＬＡＮ的接入方式为移动用户的安全接入提供了保障，而虚拟拨号又是实现Ｃｌｉｅｎｔ－ＬＡＮ的可行方案。着重介绍了如何在客户端实现虚拟拨号功能，其中包括安全传输协议... 详细信息

虚拟专用网是一种有着广泛应用前景的技术，其中Ｃｌｉｅｎｔ－ＬＡＮ的接入方式为移动用户的安全接入提供了保障，而虚拟拨号又是实现Ｃｌｉｅｎｔ－ＬＡＮ的可行方案。着重介绍了如何在客户端实现虚拟拨号功能，其中包括安全传输协议的设计及Ｗｉｎｄｏｗｓ网络驱动程序编写等。

关键词：虚拟专用网虚拟拔号驱动程序接口客户端

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Adaptive Predictive Functional Control for Networked Control Systems with Random Delays

引用

international Journal of Automation and computing 2011年第1期8卷 62-68页

作者： Xiu-lan Wang Chun-Guo Fei Zheng-Zhi Han School of electronic information and Electrical engineering Shanghai Jiao Tong University Shanghai 200030 PRC department of Automation College of Aeronautical Automation Civil Aviation University of China Tianjin 300300 PRC

Nowadays, more and more field devices are connected to the central controller through a serial communication network such as fieldbus or industrial Ethernet. Some of these serial communication networks like controller area network （CAN） or industrial Ethernet will introduce random transfer delays into the networked control systems （NCS）, which causes control performance degradation and even system instability. To address this problem, the adaptive predictive functional control algorithm is derived by applying the concept of predictive functional control to a discrete state space model with variable delay. The method of estimating the networkinduced delay is also proposed to facilitate the control algorithm implementing. Then, an NCS simulation research based on TrueTime simulator is carried out to validate the proposed control algorithm. The numerical simulations show that the proposed adaptive predictive functional control algorithm is effective for NCS with random delays.

关键词： Delay systems network control distributed control predictive control computer networks.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Safe navigation of quadrotors with jerk limited trajectory

引用

Frontiers of information Technology & electronic engineering 2019年第1期20卷 107-119页

作者： Shu-peng LAi Meng-lu lan Ya-xuan Li Ben M.CHEN department of Electrical and Computer engineering National University of Singapore Graduate School for integrative Science & engineering National University of Singapore School of Control Science and engineering Shandong University department of Mechanical and Automation engineering Chinese University of Hong Kong

Many aerial applications require unmanned aerial systems operate in safe zones because of the presence of obstacles or security regulations. it is a non-trivial task to generate a smooth trajectory satisfying both dynamic constraints and motion limits of the unmanned vehicles while being inside the safe zones. Then the task becomes even more challenging for real-time applications, for which computational efficiency is crucial. in this study, we present a safe flying corridor navigation method, which combines jerk limited trajectories with an efficient testing method to update the position setpoints in real time. Trajectories are generated online and incrementally with a cycle time smaller than 10 μs, which is exceptionally suitable for vehicles with limited onboard computational capability. Safe zones are represented with multiple interconnected bounding boxes which can be arbitrarily *** jerk limited trajectory generation algorithm has been extended to cover the cases with asymmetrical motion limits. The proposed method has been successfully tested and verified in flight simulations and actual experiments.

关键词： Quadrotor Unmanned aerial vehicle Motion planning

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparison of Algorithms for an electronic Nose in identifying Liquors

引用

Journal of Bionic engineering 2008年第3期5卷 253-257页

作者： Zhi-biao Shi Tao Yu Qun Zhao Yang Li Yu-bin lan School of Energy Resources and Mechanical engineering Northeast Dianli University Jilin 132012 P. R. China School of Chemistry engineering Northeast Dianli University Jilin 132012 P. R. China School of Electrical engineering Northeast Dianli University Jilin 132012 P. R. China Aerial Application Technlogy usDA-ARS-SPARC-APMRU Co）lege Station TX 77845 USA

When the electronic nose is used to identify different varieties of distilled liquors, the pattern recognition algorithm is chosen on the basis of the experience, which lacks the guiding principle. in this research, the different brands of distilled spirits were identified using the pattern recognition algorithms （principal component analysis and the artificial neural network）. The recognition rates of different algorithms were compared. The recognition rate of the Back Propagation Neural Network （BPNN） is the highest. Owing to the slow convergence speed of the BPNN, it tends easily to get into a local minimum. A chaotic BPNN was tried in order to overcome the disadvantage of the BPNN. The convergence speed of the chaotic BPNN is 75.5 times faster than that of the BPNN.

关键词： electronic nose liquor algorithm principal component analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：