检索结果-内蒙古大学图书馆

Electronic Components and Technology Conference (ECTC)

作者： Cheng-Yu Ho Sheng-Chi Hsieh Ming-Fong Jhong Chen-Chao Wang Chun-Yen Ting Corporation Design Division Advanced Semiconductor Engineering (ASE) Inc. Kaohsiung Taiwan Electr. Lab. Corp. Design Div. Adv. Semicond. Eng. (ASE) Kaohsiung Taiwan

This work proposes a low-cost Antenna in package (AiP) solution implemented on advanced single sided substrates (aS3 package) for 77-GHz automotive radar applications. The impact of fabrication tolerances is also studied in this work. This work demonstrates firstly the 77-GHz losses of the transition from chip to package among flip-chip ball grid array (FCBGA) package, flip chip chip scale (FCCSP) package, Fan out wafer level chip scale package (Fan-out WLP), and aS3 package. Although Fan-out WLP can minimizes 77-GHz losses of transition from chip to package plus package to PCB, low-cost AiP solutions are very important for 77-GHz automotive radar applications. The proposed AiP solution on aS3 package has low losses of transition from chip to package, and the performance of designed antenna on aS3 package meets the requirements of 77-GHz automotive radar systems. Finally, this work also demonstrates the impact of fabrication inaccuracies on the bandwidth and radiation pattern of AiP on aS3 package. This work provides a cost-effective AiP approach for 77-GHz automotive radar systems.

关键词： Automotive engineering Radar Radar antennas Compounds Dipole antennas Copper Antenna radiation patterns

来源：评论

学校读者我要写书评

暂无评论

Combined subsampling and analytical integration for efficient large-scale GW calculations for 2D systems

引用

npj Computational Materials 2020年第1期6卷 660-668页

作者： Weiyi Xia Weiwei Gao Gabriel Lopez-Candales Yabei Wu Wei Ren Wenqing Zhang Peihong Zhang Department of Physics University at BuffaloState University of New YorkBuffaloNY 14260USA Center for Computational Materials Oden Institute for Computational Engineering and SciencesThe University of Texas at AustinAustinTX 78712USA Department of Physics and Shenzhen Institute for Quantum Science&Engineering Southern University of Science and TechnologyShenzhen 518055 GuangdongChina Guangdong Provincial Key Lab for Computational Science and Materials Design Southern University of Science and TechnologyShenzhen 518055 GuangdongChina Shenzhen Municipal Key Lab for Advanced Quantum Materials and Devices Southern University of Science and TechnologyShenzhen 518055 GuangdongChina International Centre for Quantum and Molecular Structures Shanghai UniversityShanghai 200444China Department of Physics Shanghai UniversityShanghai 200444China

Accurate and efficient predictions of the quasiparticle properties of complex materials remain a major challenge due to the convergence issue and the unfavorable scaling of the computational cost with respect to the system *** GW calculations for two-dimensional(2D)materials are especially *** unusual analytical behaviors of the dielectric screening and the electron self-energy of 2D materials make the conventional Brillouin zone(BZ)integration approach rather inefficient and require an extremely dense k-grid to properly converge the calculated quasiparticle *** this work,we present a combined nonuniform subsampling and analytical integration method that can drastically improve the efficiency of the BZ integration in 2D GW calculations.

关键词： analytical integration subsampling

来源：评论

学校读者我要写书评

暂无评论

Analysis of Typical Energy Saving Technology in the Sewage Treatment Plant

引用

Energy Procedia 2017年 142卷 1230-1237页

作者： Qunli Zhang Donghan Sun Mingshuang Wang Chaohui Yin Beijing Municipality Key Lab of Heating Gas Supply Ventilating and Air Conditioning Engineering Beijing University of Civil Engineering and Architecture Xicheng District Beijing 100044 China Beijing Advanced Innovation Center For Future Urban Design Beijing University of Civil Engineering and Architecture Xicheng District Beijing 100044 China

There are a large amount of low-grade waste thermal energy in the sewage and abundant organic substances in the sludge. By making full use of the energy in these resources, which can complement or offset the energy consumed in the sewage treatment process, the sewage treatment plants can significantly reduce the amount of carbon dioxide indirect emissions. The goal of “carbon neutrality” in the sewage treatment plant can be achieved. The sewage source heat pump using sewage thermal energy can supply cooling and heating in the buildings; The sludge anaerobic digestion process can produce a lot of biogas for generating electricity; The photovoltaic power generation modules can compensate the heat and the electric consumption of the sewage treatment plant. Comparing and analyzing the differences of three technologies in aspects of energy saving, economic feasibility and carbon neutral, the research result shows that the best treatment method is the SSHP technology, which have energy saving potential by using low-grade waste thermal energy and is contributed to achieve “carbon neutrality” of the sewage treatment plant.

关键词： Sewage treatment plant Low grade heat source Sewage source heat pump Heating Carbon neutral

来源：评论

学校读者我要写书评

暂无评论

Experimental study on the cooling charge and discharge characteristics of a PCM based fin-tube thermal energy storage exchanger

引用

Procedia engineering 2017年 205卷 3088-3095页

作者： Wen-ju Hu Mo-ning Chang Yan Gao Qun-li Zhang Ling-yan Yang De-ying Li Beijing Key Lab of HVAC Beijing University of Civil Engineering and Architecture Beijing 100044 China Beijing Advanced Innovation Center for Future Urban Design Beijing University of Civil Engineering and Architecture Beijing 100044 China China Academy of Building Research Beijing 100013 China

In view of the organic phase change materials (PCM)’s low thermal conductivity which was bad for heat transfer and storage, a kind of fin-tube thermal energy storage exchanger(TESE) was proposed. The experimental study was carried out for the cooling charge and discharge characteristics of a PCM based fin-tube TESE. Experiment results showed that the difference of thermal conductivity of PCM in the solid phase and the liquid phase, and thermal expansion and contraction existing during the phase transition, led to the phenomenon that PCM based fin-tube thermal energy storage exchanger’s cooling discharging rate was much higher than the charging rate, and the TESE showed good discharging characteristics of cooling. The cooling storage period of the fin-tube TESE was relatively long, and the suction and exhaust pressure of the compressor slightly decreased during the cooling storage process. Finally, the inlet water temperature of the PCM based fin-tube TESE influenced he cooling characteristics greatly, and the outlet water temperature increased linearly with time while the cooling rate decreased linearly.

关键词： fin-tube heat exchanger phase-change energy storage charge discharge characteristics of cooling

来源：评论

学校读者我要写书评

暂无评论

Utilization Potential and Economic Feasibility Analysis of Bathing Sewage and its Heat Generated in Colleges and Universities

引用

Energy Procedia 2017年 142卷 1244-1250页

作者： Qunli Zhang Xingquan Fan Wenjing Zhang Zhiming Wang Beijing Municipality Key Lab of Heating Gas Supply Ventilating and Air Conditioning Engineering Beijing University of Civil Engineering and Architecture Xicheng District Beijing 100044 China Beijing Advanced Innovation Center for Future Urban Design Beijing University of Civil Engineering and Architecture Xicheng District Beijing 100044 China

The applicability of using sewage source heat pump to recover the waste heat from the public bathrooms in colleges and universities is analysed in this paper. Analysis shows that bathing sewage is very suitable for the waste heat recovery by using sewage source heat pump because of its suitable water flow, water temperature and water quality. At the same time, its utilization potential is analysed. Analysis shows that a great energy-saving and pollutant-reducing benefits will be made if those heat is recovered. Finally, technical and economic analysis of this system is done. Taking a university bathroom in Beijing as an example, this method is economic feasible and the payback period is 3.39 years.

关键词： bathing sewage utilization potential sewage source heat pump economic feasibility

来源：评论

学校读者我要写书评

暂无评论

Urban street clusters: unraveling the associations of street characteristics on urban vibrancy dynamics in age, time, and day

引用

Urban Informatics 2024年第1期3卷 1-25页

作者： Jang, Kee Moon Suh, Hanew Haddad, Fadi Ghassan Sun, Maoran Duarte, Fábio Kim, Youngchul Senseable City Lab MIT Cambridge USA Urban Design Lab Department of Civil and Environmental Engineering Korea Advanced Institute of Science and Technology Daejeon Republic of Korea Fulbright Canada Ottawa Canada Department of Architecture University of Cambridge Cambridge UK KAIST Smart City Research Center Korea Advanced Institute of Science and Technology Daejeon Republic of Korea

Understanding urban vibrancy has been considered crucial to promoting human activities and interactions in public open spaces. Recent advancements in urban big data have facilitated the potential to understand and measure vibrancy patterns throughout cities. While streets are considered the center stage of human activity, previous studies have often overlooked their multifaceted nature and their association with urban vibrancy. In this study, we incorporate multi-source big data and combine a set of features that comprehensively describe the scale, function, and topology of street segments in two Seoul districts: Jung-gu and Gangnam-gu. Using these features, we employ a machine learning clustering technique to classify them into five distinct typologies. Then, with street-level aggregated mobile phone tracking data, we investigate whether street typology characteristics are associated with urban vibrancy with respect to age groups, time of day, and day types (weekends/weekdays). The results show varying relationships between street characteristics with age-, time- and day-vibrancy measures by the identified street typology. Further, we contrast the results of the two districts to evaluate urban vibrancy differences in organic and planned urban layouts. This study enables a more nuanced understanding of urban streets to better comprehend their impact on people’s use of street space. The derived novel insights could assist planners and designers to better pinpoint street management solutions for different age- and time-dependent needs based on the complexities in urban vibrancy dynamics.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Triplet-Attention Residual Network for Breast Cancer Histopathology Image Classification 21

Triplet-Attention Residual Network for Breast Cancer Histopa...

引用

Proceedings of the 5th International Conference on Advances in Image Processing

作者： Lu Cao Shan Huang Jianxin Zhang School of Computer Science and Engineering Dalian Minzu University China School of Computer Science and Engineering Dalian Minzu University China and Key Lab of Advanced Design and Intelligent Computing(Ministry of Education) Dalian University China

ISBN: (纸本)9781450385183

Recently, breast cancer histopathology image classification using convolutional neural networks has achieved more and more attentions with the great progress. To capture more discriminant deep features for the classification, this paper proposes a novel triplet-attention residual network, i.e., TAResNet, to distinguish the breast cancer histopathology image. TAResNet employs the representative ResNet18 model to extract deep features of histopathology images, followed by a triplet-attention module to further boost the discriminability of deep features through expanding feature diversity and enhancing inter-dimensional dependency. Extensive experiments carried out on the public BreakHis dataset well evaluate the effectiveness the given TAResNet model. More specifically, TAResNet achieves its optimal classification accuracy of 98.34% and 98.77% at the image level and patient level, respectively.

关键词： Breast cancer Triplet attention Histopathological image classification Convolutional neural network

来源：评论

学校读者我要写书评

暂无评论

Optimization of a Neural Dynamics Based Controller for a Nonholonomic Mobile Robot Using Genetic Algorithms

Optimization of a Neural Dynamics Based Controller for a Non...

引用

International Conference on Control and Automation (ICCA)

作者： Hao Li S.X. Yang F. Karray Pattern Analysis and Machine Intelligence (PAMI) Lab Systems Design Engineering University of Waterloo Waterloo ONT Canada Advanced Robotics and Intelligent Systems (ARIS) Laboratory School of Engineering University of Guelph Guelph ONT Canada

In this paper, a neural dynamics based controller for a nonholonomic mobile robot is proposed. The turn angle of the robot in the proposed model is characterized by a biologically inspired shunting equation derived from Hodgkin and Huxley’s membrane equation. This model is capable of generating smooth steering velocity command that drives the robot to track desired paths. Some parameters in the proposed neural dynamics based controller need to be selected. A genetic algorithm is designed to optimize the model parameters that can guarantee the convergence of tracking error of the mobile robot. Simulation studies of a fourdegree-of-freedom mobile robot are conducted, which demonstrate the effectiveness of the proposed motion controller.

关键词： Mobile robots Genetic algorithms Biological system modeling Equations Biomembranes Algorithm design and analysis design optimization Convergence Motion control

来源：评论

学校读者我要写书评

暂无评论

A Multi-input Deep Neural Network Framework for Non-invasive Detection of Anemia using Finger Nail Images

A Multi-input Deep Neural Network Framework for Non-invasive...

引用

International Conference on Biosignals, Images and Instrumentation (ICBSII)

作者： Krithika S Ajay Kumar Reddy Poreddy Thunakala Balakrishna Priyanka Kokil Department of Computer Science and Engineering Amrita Vishwa Vidyapeetham Chennai India Department of Electronics and Communication Engineering Advanced Signal and Image Processing (ASIP) Lab Indian Institute of Information Technology Design and Manufacturing Kancheepuram Chennai

ISBN: (数字)9798350350951

ISBN: (纸本)9798350350968

Anemia, characterized by a deficiency in red blood corpuscles or hemoglobin, poses a significant global health challenge, particularly affecting vulnerable populations. Traditional diagnostic methods often involve invasive procedures, posing challenges in resource-limited settings. This study aims to explore non-invasive anemia detection using fingernail images and convolutional neural networks (CNNs) as a promising alternative to conventional diagnostic approaches. The study utilizes a dataset of fingernail images collected from hospitals in Ghana, comprising both anemic and non-anemic cases. The dataset undergoes preprocessing, including selective enhancement of red components, conversion to the CIElab color space, and feature extraction. A multi-input Deep Neural Network (DNN) framework employing pre-trained CNNs is proposed for anemia classification. The pre-trained CNN architectures include EfficientNet B1, EfficientNet B4, and MobileNet V3. The framework’s performance was assessed using two methodologies: The first involved random shuffling of the dataset, followed by division into training, testing, and validation sets, with evaluation metrics including Accuracy, Precision, F1 scores, and a Confusion Matrix. The second employed five-fold cross-validation, measured using accuracy. The evaluation of the proposed DNN framework using both of the methodologies indicates that EfficientNet B4 achieved the highest testing accuracy (97.87%), precision (97.88%), recall (97.87%), and F1 score (97.88%) and a cross-validation accuracy of 97.37% for the first and second methodologies respectively making it best fit for the proposed DNN framework. The findings demonstrate that the proposed framework yields promising results, especially under the second approach, and opens avenues for further exploration in transfer learning, fine-tuning of deep neural networks for multi-input feature integration, and cross-validation.

关键词： Training Accuracy Transfer learning Sociology Nails Quality assessment Convolutional neural networks

来源：评论

学校读者我要写书评

暂无评论

Structural and emission characteristics of iron-oxide whiskers on a steel plate

Structural and emission characteristics of iron-oxide whiske...

引用

2005 International Microprocesses and Nanotechnology Conference

作者： Okada, M. Neo, Y. Kubomura, K. Mimura, H. Advanced Technology Research Lab. Nippon Steel Corporation 20-1 Shintomi Futtu Chiba 293-8511 Japan Research Institute of Electronics Shizuoka University 3-5-1 Johoku Hamamatsu 432-8011 Japan Material Design Engineering Kanazawa Institute of Tech. 7-1 Ohgigaoka Nonoichi Ishikawa 921-8501 Japan

ISBN: (纸本)4990247221

Diverse nanostructures such as nanotubes and nanowires are considered to be a field-emission (FE) electron source because the high aspect ratio allows for good electron emission. A spin-polarized emitter using the magnetic property is a promising electron source for ultra high-density memories. However, few studies on ferromagnetic wires have been conducted. In this presentation, the results of the field emission characteristics of magnetite whiskers grow on one side of a steel plate are presented. Iron-oxide whiskers grown on an SUS304 steel plate (1mmt) were shown in Fig. 1 of the SEM image and in Fig. 2 of the TEM image. The whiskers are randomly aligned and their diameter is about 200 nm. In Fig. 2, the whisker includes dark spots, which may derive from internal strain. The atomic ratio of the whiskers analyzed by TEM-EDX is shown in Table 1. There is more oxygen in the tip of the whisker than in the root. According to electron diffraction analyses, the whiskers are magnetite single crystals. The emission characteristic of the whisker on the SUS plate is shown in Fig. 3. The relatively good field emission characteristic of 15mA/cm 2 was obtained at 19V/nm, though the emission characteristic was strongly influenced by the structure of the whiskers. In this presentation, we will discuss emission characteristics of the whiskers.

关键词： Plates (structural components)

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：