检索结果-内蒙古大学图书馆

14th International Conference on Intelligent Information Hiding and Multimedia Signal Processing, IIH-MSP 2018

作者： Wu, Tsu-Yang Chen, Chien-Ming Wang, King-Hang Wu, Jimmy Ming-Tai Pan, Jeng-Shyang Fujian Provincial Key Lab of Big Data Mining and Applications Fujian University of Technology Fuzhou350118 China National Demonstration Center for Experimental Electronic Information and Electrical Technology Education Fujian University of Technology Fuzhou350118 China Shenzhen518055 China Department of Computer Science and Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong College of Computer Science and Engineering Shandong University of Science and Technology Qingdao266590 China

In order to solve the security problem that off-line keyword guessing attacks existed in PEKS or dPEKS scheme, Huang and Li introduced a new security model called PAEKS. In this paper, we show that their scheme didn’... 详细信息

ISBN: (纸本)9783030037444

关键词： Search engines

来源：评论

学校读者我要写书评

暂无评论

A simple image encryption algorithm based on logistic map 5th

A simple image encryption algorithm based on logistic map

引用

5th Euro-China Conference on Intelligent Data Analysis and Applications, ECC 2018

作者： Wu, Tsu-Yang Wang, King-Hang Chen, Chien-Ming Wu, Jimmy Ming-Tai Pan, Jeng-Shyang Fujian Provincial Key Lab of Big Data Mining and Applications Fujian University of Technology Fuzhou350118 China National Demonstration Center for Experimental Electronic Information and Electrical Technology Education Fujian University of Technology Fuzhou350118 China Department of Computer Science and Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong Shenzhen518055 China College of Computer Science and Engineering Shandong University of Science and Technology Qingdao266590 China

ISBN: (纸本)9783030037659

Based on the better properties of chaotic maps, the studies of chaotic-based image encryption have received much attentions by researchers in recent years. In this paper, an image encryption algorithm based on logistic map with substitution approach is proposed. Meanwhile, we make the line chart, histogram, and pixel loss analysis to show the performance of our algorithm. © Springer Nature Switzerland AG 2019.

关键词： Cryptography

来源：评论

学校读者我要写书评

暂无评论

Effect of complex modification of Al-5Ti and Al-3P on hypereutectic Al-18Si alloys

引用

Journal of Central South University 2019年第10期26卷 2651-2660页

作者： WANG Jian-hua YANG Wei TU Hao LIU Ya PENG Hao-ping SU Xu-ping Jiangsu Key Laboratory of Materials Surface Science and Technology School of Materials Science and EngineeringChangzhou UniversityChangzhou 213164China Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou UniversityChangzhou 213164China National Experimental Teaching Demonstration Center of Materials Science and Engineering Changzhou UniversityChangzhou 213164China

The solidification microstructure,fracture morphologies,and mechanical properties of an Al-18Si alloy and alloys modified with Al-5Ti and Al-3P master alloys were investigated using an optical microscope,scanning electron microscope,and an electronic universal testing *** results show that additions of Al-5Ti and Al-3P have significant effects on the size and area fraction of the primary Si and the mechanical properties of the Al-18Si *** to the Al-18Si alloy modified with 0.6 wt%Al-5Ti at 850°C,when the Al-18Si alloy was modified with 0.3 wt%Al-5Ti and 0.5 wt%Al-3P at the same temperature,the average size of the primary Si decreased from 39 to 14μm and the area fraction increased from 9.5%to 11.6%.The biggest influencing factor on the tensile strength and elongation of the Al-18Si alloy is the addition of Al-3P,followed by the modification temperature and the addition of *** a modification temperature of 850°C,the tensile strength and elongation of the Al-18Si alloy modified with 0.3 wt%Al-5Ti+0.5 wt%Al-3P increased by 19.6%and 88.6%,respectively compared to that of the Al-18Si alloy modified with 0.6 wt%Al-5Ti.

关键词： hypereutectic Al-Si alloy modification solidification structure mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Microstructure and mechanical properties of Al-10Si alloy modified with Al-5Ti

引用

China Foundry 2018年第6期15卷 405-410页

作者： Ya-ling Liu Chang-jun Wu Hao Tu Xiao-wang Lu Jian-hua Wang Xu-ping Su Jiangsu Key Laboratory of Material Surface Science and Technology School of Materials Science and Engineering Changzhou University National Experimental Teaching Demonstration Center of Materials Science and Engineering Changzhou University Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University

The microstructure, fracture morphology and mechanical properties of Al-10 Si alloy modified with Al-5 Ti were analyzed and tested by optical microscopy, scanning electron microscopy, and universal electronic testing machine. Compared with unmodified Al-10 Si alloy, the area fraction of α-Al phase in Al-10 Si alloy modified at 740 °C increased first and then decreased with the increase of added amounts of Al-5 Ti, and reached the maximum when the added amount of Al-5 Ti was 0.5 wt.%. When the modification temperature increased from 700 to 740 °C with Al-5 Ti being fixed at 0.5 wt.%, α-Al dendrites were refined obviously and the area fraction remarkably increased. Compared with unmodified Al-10 Si alloy, the ultimate tensile strength and elongation of the alloy modified at 740 °C with 0.5 wt.% Al-5 Ti increased by 9% and 49%, respectively. The fracture surface of modified alloy predominantly exhibited ductile fracture.

关键词： Al-10Si modification microstructure mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Cuckoo search algorithm based on stochastic gradient descent 5th

Cuckoo search algorithm based on stochastic gradient descent

引用

5th Euro-China Conference on Intelligent Data Analysis and Applications, ECC 2018

作者： Tian, Yuan Liang, Yong-quan Peng, Yan-jun Princeton University PrincetonNJ08544 United States College of Computer Science and Engineering Shandong University of Science and Technology Qingdao China Provincial Key Laboratory for Information Technology of Wisdom Mining of Shandong Province Shandong University of Science and Technology Qingdao China Experimental Teaching Center of National Virtual Simulation for Security Mining Shandong University of Science and Technology Qingdao China

ISBN: (纸本)9783030037659

Cuckoo Search (CS) is a global search algorithm for solving multi-objective optimization problems. Cuckoo Search algorithm is easy to implement and has a few number of control parameters, excellent search path and strong optimization capability. It has been successfully applied to practical problems, such as engineering optimization. To improve the refining ability and convergence rate of CS algorithm, solve the problem of slow convergence rate and unstable search accuracy in later stage, this paper proposes a Cuckoo Search Algorithm based on Stochastic Gradient Descent (SGDCS). This algorithm uses Stochastic Gradient Descent to enhance the search of the local optimum, convergence process and algorithm adaptability, which improves the calculation accuracy and convergence rate of cuckoo search algorithm. The simulation experiments show that the proposed algorithm is simple and efficient, efficiently improves the performances on calculation accuracy and convergence rate on the basis of maintaining the advantages of the standard CS algorithm. © Springer Nature Switzerland AG 2019.

关键词： Multiobjective optimization

来源：评论

学校读者我要写书评

暂无评论

Numerical investigation on the effect of second throat diameter on two-throat nozzle ejector

引用

Journal of Physics: Conference Series 2021年第1期2047卷

作者： F T Jia D Z Yang J Xie College of Food Science and Technology Shanghai Ocean University Shanghai 201306 China Shanghai Professional Technology Service Platform on Cold Chain Equipment Performance and Energy Saving Evaluation Shanghai 201306 China National Experimental Teaching Demonstration Center for Food Science and Engineering Shanghai 201306 China

The employment of two-phase ejectors in the CO2 refrigeration systems is widely developed recently. Due to the lack reports on the two-throat nozzle ejectors, the performance of CO2 two-throat nozzle ejector varied with different second throat diameter (Dt) was numerically investigated under different primary pressures (Pp). The accuracy of established numerical simulation model was confirmed with the assistance of experimental data summarized in the literature. The simulated results show that the two-throat nozzle ejector performance corresponding to entrainment ratio (Er) is of better stability with relatively bigger Dt under different working conditions. Next, the axial static pressure corresponding to bigger Dt is lower than that of smaller one at pre-mixing chamber. And the secondary flow velocity of bigger Dt is accelerated better as compared to that of smaller one.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Functional characterization of a Δ6 fatty acid desaturase gene and its 5′-upstream region cloned from the arachidonic acid-rich microalga Myrmecia incisa Reisigl(Chlorophyta)

引用

Journal of Oceanology and Limnology 2018年第6期36卷 2308-2321页

作者： ZHANG Li CAO Haisheng NING Pu ZHOU Zhigang Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources Conferred by Ministry of Education Shanghai Ocean University National Demonstration Center for the Experimental Teaching of Fisheries Science Shanghai Ocean University International Research Center for Marine Biosciences Conferred by Ministry of Science and Technology Shanghai Ocean University

It is suggested that Δ6 fatty acid desaturase(FAD) plays a critical role in the biosynthesis of polyunsaturated fatty acids in plants and microalgae. But why does it adapt to the changed environments such as nitrogen starvation is seldom understood. One Δ6 FAD gene( MiD6 fad) from an arachidonic acidrich microalga M yrmecia incisa Reisigl(Chlorophyta) was first heterologously expressed in S accharomyces cerevisiae for the identification of function. The fatty acid profile of transgenic yeast detected by gas chromatography-mass spectrometry illustrated that the enzyme MiD6 FAD could convert linoleic and ?-linolenic acids to γ-linolenic and stearidonic acids, respectively, demonstrating that M iD6 fad encoded a Δ6 FAD. A 1 965-bp fragment of the cloned 2 347-bp 5′-upstream region of M iD6 fad was next subcloned and fused upstream with green fluorescent protein(GFP) gene to replace the GAL1 promoter of the vector pYES2. The generated construct was transformed into S. cerevisiae for function determination. Confocal microscopic images of the transformed line illustrated that this inserted fragment could drive GFP expression, which was further verified by fluorescence intensity quantification and Western blot analysis using antiGFP antibody. The conversion efficiency(approximately 2%-3%) of MiD6 FAD was much lower than the reported ? 3 FAD and Δ6 elongase in this microalga, suggesting that MiD6 FAD catalysed the possible ratelimiting step for ArA biosynthesis. The presence of several putative c is-acting regulatory elements in this identified promoter sheds new light on the regulation mechanism research of Δ6 FAD transcription for the ArA production in M. incisa in changing environmental factors.

关键词： arachidonic acid(ArA) fatty acid desaturase(FAD) green fl uorescent protein(GFP) green microalga Saccharomyces cerevisiae 5′-upstream region(5′-USR)

来源：评论

学校读者我要写书评

暂无评论

Semantic representation based on clustering and attention mechanism to identify deceptive comment models

引用

Journal of computers (Taiwan) 2019年第4期30卷 130-139页

作者： Zhang, Jian-Xin Du, Xue-Dong Wang, Bin-Guo Provincial Computer Experimental Teaching Demonstrating Center of Shandong Province Department of Computer Science and Engineering Shandong University of Science and Technology Qingdao266590 China

Deceptive reviews of products influence customer’s decision and damage the reputation of the product. Most of the existing methods for detecting fraudulent comments use feature design, which is difficult to learn the potential semantics of comments. We propose a neural network based on clustering and attention mechanism to learn the semantic representation of reviews. Specifically, we use DBSCAN to discover the semantic groups in the word embedding space, and then construct the semantics of different semantic groups through the attention mechanism. The model computes the representations of the semantic units and combine them into the sentence representation. In feature selection, we perform feature combination to improve performance. Then we demonstrate the effectiveness of the proposed model through Amazon dataset experiments. In the experiment, the model surpassed the state-of-art method. © 2019 computer Society of the Republic of China. All rights reserved.

关键词： Semantics

来源：评论

学校读者我要写书评

暂无评论

Effect of different inlet pressures of vortex tube on internal flow field

引用

Journal of Physics: Conference Series 2021年第1期2029卷

作者： Qijun Xu Jing Xie Shanghai Professional Technology Service Platform on Cold Chain Equipment Performance and Energy Saving Evaluation Shanghai 201306 China National Experimental Teaching Demonstration Canter for Food Science and Engineering Shanghai 201306 China College of Food Science and Technology Shanghai Ocean University Shanghai 201306 China

Numerical simulations were used to investigate the distribution of the internal pressure, velocity, and temperature fields in the vortex tube (VOTU) at inlet pressures of 1-4 MPa to reveal the causes of temperature separation. A three-dimensional model with a nozzle flow channel number of 5 was drawn, and the simulation was performed in Fluent 19.0 with CO2 as the working fluid. The simulation results show that when the inlet pressure of the VOTU is greater than 2 MPa, the temperature separation between the hot and cold air streams of the VOTU gradually increases with the increase of the inlet pressure. The maximum temperature is 285 K and the minimum temperature is 257 K at an inlet pressure of 1.0 MPa, and the maximum temperature is 319 K and the minimum temperature is 243 K at an inlet pressure of 4.0 MPa. As the inlet pressure increases, the temperature difference inside the VOTU will also increase. In the high-pressure condition, the wall thickness and sealing degree of the VOTU design should be increased accordingly, while the inner wall side of the VOTU needs to use wear-resistant materials to delay the long-term scouring of the VOTU caused by high-speed airflow. The results of the study have certain guiding significance for the design and manufacture of VOTUs.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Effect of different inlet pressures on the temperature field, velocity field and pressure field of a vortex tube

引用

Journal of Physics: Conference Series 2021年第1期2047卷

作者： Q J Xu J Xie College of Food Science and Technology Shanghai Ocean University Shanghai 201306 China Shanghai Professional Technology Service Platform on Cold Chain Equipment Performance and Energy Saving Evaluation Shanghai 201306 China National Experimental Teaching Demonstration Canter for Food Science and Engineering Shanghai 201306 China

In view of the wide application of vortex tube (VOTU) in the market, and in order to enhance the capability of VOTU in the higher inlet pressure, three-dimensional numerical simulations were performed with existing experimental data and models to analyse the flow fields of VOTUs at different pressures. With the increase of pressure, the maximum temperature of the VOTU rises rapidly and the minimum temperature decreases smoothly. Meanwhile, when the VOTU works under high pressure, the wall thickness and sealing degree of the VOTU design should be increased accordingly, while the inner wall of the VOTU should be made of wear-resistant material to avoid the wear of the VOTU caused by the long-term scouring of the high-speed airflow.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：