检索结果-内蒙古大学图书馆

Masked Generative Light Field Prompting for Pixel-Level Structure Segmentations

research 2024年第4期2024卷 533-544页

作者： Mianzhao Wang Fan Shi Xu Cheng Shengyong Chen The Engineering Research Center of Learning-Based Intelligent System(Ministry of Education) Tianjin University of TechnologyTianjin 300384China Key Laboratory of Computer Vision and System(Ministry of Education) Tianjin University of TechnologyTianjin 300384China School of Computer Science and Engineering Tianjin University of TechnologyTianjin 300384China

Pixel-level structure segmentations have attracted considerable attention,playing a crucial role in autonomous driving within the metaverse and enhancing comprehension in light field-based machine ***,current light field modeling methods fail to integrate appearance and geometric structural information into a coherent semantic space,thereby limiting the capability of light field transmission for visual *** this paper,we propose a general light field modeling method for pixel-level structure segmentation,comprising a generative light field prompting encoder(LF-GPE)and a prompt-based masked light field pretraining(LF-PMP)*** LF-GPE,serving as a light field backbone,can extract both appearance and geometric structural cues *** aligns these features into a unified visual space,facilitating semantic ***,our LF-PMP,during the pretraining phase,integrates a mixed light field and a multi-view light field *** prioritizes considering the geometric structural properties of the light field,enabling the light field backbone to accumulate a wealth of prior *** evaluate our pretrained LF-GPE on two downstream tasks:light field salient object detection and semantic *** results demonstrate that LF-GPE can effectively learn high-quality light field features and achieve highly competitive performance in pixel-level segmentation tasks.

关键词： prompt backbone integrate

来源：评论

学校读者我要写书评

暂无评论

Guaranteeing Wireless Communication Reliability via an Extended Hybrid Carrier system

引用

China Communications 2023年第7期20卷 192-202页

作者： Ge Song Xiaojie Fang Xuejun Sha School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China Engineering Research Center for Dedicated Communication System Ministry of EducationHarbin 150080China

In this paper,we propose an extended hybrid carrier system based on the weighted fractional Fourier transform to ensure the reliability of wireless *** proposed scheme improves the dispersion and compensation capabilities of the hybrid carrier system for channel fading through the design of the signal power distribution,which has greatly reduced the probability of high-power distortion of the signal and improved the bit error rate performance as a *** analysis has shown the superiority of the extended hybrid carrier *** a lower cost of computational complexity increment,the proposed scheme obtains a performance improvement without occupying additional time-frequency physical *** with the existing hybrid carrier scheme,numerical simulation results have shown that the proposed extended hybrid carrier scheme has better anti-fading performance under the doubly-selective channel and improves the reliability of the wireless communication system effectively.

关键词： extended hybrid carrier weighted frac-tional Fourier transform bit error rate doubly-selective channel

来源：评论

学校读者我要写书评

暂无评论

Design and Verification of Parallel Hip Exoskeleton Considering Output Torque Anisotropy

引用

Journal of Bionic engineering 2024年第3期21卷 1305-1320页

作者： Jilong Xu Yunzhan Niu Fucai Liu Engineering Research Center of the Ministry of Education for Intelligent Control System and Intelligent Equipment Yanshan UniversityQinhuangdao066004China Key Laboratory of Industrial Computer Control Engineering of Heibei Province Yanshan UniversityQinhuangdao066004China College of Mechanical Engineering Yanshan UniversityQinhuangdao066004China

In rehabilitation training,it is crucial to consider the compatibility between exoskeletons and human legs in ***,most exoskeletons today adopt an anthropomorphic serial structure,which results in rotational centers that are not precisely aligned with the center of the hip *** address this issue,we introduce a novel exoskeleton called the Parallel Hip Exoskeleton(PH-Exo)in this ***-Exo is meticulously designed based on the anisotropic law of output *** the friction of the drive components,a dynamic model of the human-machine complex is *** analysis demonstrates that PH-Exo not only exhibits outstanding torque performance but also achieves high controllability in both flexion/extension and adduction/abduction ***,a robust controller is designed to address model uncertainty,friction,and external *** experiments indicate that under the control of the robust controller,each motor achieves excellent tracking performance.

关键词： Hip exoskeleton Parallel mechanism Misalignment Anisotropy Output torque

来源：评论

学校读者我要写书评

暂无评论

Quantum dot-enabled infrared hyperspectral imaging with single-pixel detection

引用

Light(Science & Applications) 2024年第6期13卷 1112-1121页

作者： Heyan Meng Yuan Gao Xuhong Wang Xianye Li Lili Wang Xian Zhao Baoqing Sun School of Information Sciences and Engineering Shandong UniversityQingdaoChina Center for Optics Research and Engineering(CORE) Key Laboratory of Laser&Infrared System(Shandong University)Ministry of EducationShandong UniversityQingdaoChina School of Mechanical Electrical and Information EngineeringShandong UniversityWeihaiChina

Near-infrared(NIR)hyperspectral imaging is a powerful technique that enables the capture of three-dimensional(3D)spectra-spatial information within the NIR spectral range,offering a wide array of ***,the high cost associated with InGaAs focal plane array(FPA)has impeded the widespread adoption of NIR hyperspectral *** this challenge,in this study,we adopt an alternative approach—single-pixel detection for NIR hyperspectral *** investigation reveals that single-pixel detection outperforms conventional FPA,delivering a superior signal-to-noise ratio(SNR)for both spectral and imaging *** implement this strategy,we leverage self-assembled colloidal quantum dots(CQDs)and a digital micromirror device(DMD)for NIR spectral and spatial information multiplexing,complemented by single-pixel detection for simultaneous spectral and image *** experimental results demonstrate successful NIR hyperspectral imaging with a detection window about 600 nm and an average spectral resolution of 8.6 nm with a pixel resolution of 128×*** resulting spectral and spatial data align well with reference instruments,which validates the effectiveness of our *** circumventing the need for expensive and bulky FPA and wavelength selection components,our solution shows promise in advancing affordable and accessible NIR hyperspectral imaging technologies,thereby expanding the range of potential applications.

关键词： spectral Quantum mirror

来源：评论

学校读者我要写书评

暂无评论

Answering reachability queries with ordered label constraints over labeled graphs

引用

Frontiers of Computer Science 2024年第1期18卷 105-117页

作者： Daoliang HE Pingpeng YUAN Hai JIN National Engineering Research Center for Big Data Technology and System Services Computing Technology and System LabCluster and Grid Computing LabSchool of Computer Science&TechnologyHuazhong University of Science and TechnologyWuhan 430074China

Reachability query plays a vital role in many graph analysis *** researches proposed many methods to efficiently answer reachability queries between vertex *** many real graphs are labeled graph,it highly demands Label-Constrained Reachability(LCR)query inwhich constraint includes a set of labels besides vertex *** researches proposed several methods for answering some LCR queries which require appearance of some labels specified in constraints in the *** that constraint may be a label set,query constraint may be ordered labels,namely OLCR(Ordered-Label-Constrained Reachability)queries which retrieve paths matching a sequence of ***,no solutions are available for ***,we propose DHL,a novel bloom filter based indexing technique for answering OLCR *** can be used to check reachability between vertex *** the answers are not no,then constrained DFS is ***,we employ DHL followed by performing constrained DFS to answer OLCR *** show that DHL has a bounded false positive rate,and it's powerful in saving indexing time and *** experiments on 10 real-life graphs and 12 synthetic graphs demonstrate that DHL achieves about 4.8-22.5 times smaller index space and 4.6-114 times less index construction time than two state-of-art techniques for LCR queries,while achieving comparable query response *** results also show that our algorithm can answer OLCR queries effectively.

关键词： graph ordered-label-constrained reachability partial index bloom filter query processing

来源：评论

学校读者我要写书评

暂无评论

Oil Palm Trunks as Raw Material for Bioethanol Production: A Study on the Delignification Efficiency of Betaine-Based Natural Deep Eutectic Solvents

引用

Waste and Biomass Valorization 2025年 1-16页

作者： Hasanah, Nuur Faridatun Darmawan, Muhammad Arif Muryanto Aminuddin Bahua, Hismiati Hidayat, Herman Rosadi, Dadang Abidin, Kharis Yohan Pradiva, Molina Indah Rosjidi, Mochamad Research Center for Process and Manufacturing Industry Technology National Research and Innovation Agency South Tangerang Indonesia Research Center for Chemistry National Research and Innovation Agency South Tangerang Indonesia Magister of Industrial Engineering Mercu Buana University West Jakarta Indonesia Research Center for Sustainable Production System and Life Cycle Assessment National Research and Innovation Agency South Tangerang Indonesia Research Center for Biomass and Bioproduct National Research and Innovation Agency Bogor Indonesia Research Center for Agroindustry National Research and Innovation Agency South Tangerang Indonesia

Non-productive oil palm trunks (OPT), rich in starch and cellulose, are promising raw materials for bioethanol production. Effective pretreatment is essential to optimize the cellulose-to-lignin ratio, facilitating hydrolysis. This study investigates the delignification efficiency of natural deep eutectic solvents (NaDES) on OPT, focusing on the impact of different hydrogen donors. The treated biomass was analyzed using FTIR, SEM, and XRD, confirming the effectiveness of these NaDES in lignin degradation. The novel tailored DES formulation have enhanced interactions with OPT’s lignin-rich structure, optimizing delignification and unlocking its potential as a renewable feedstock. Using a 1:2 ratio of hydrogen bond acceptor to donor and maintaining consistent reaction conditions, betaine/lactic acid and betaine/glycerol NaDES achieved optimal delignification, reducing lignin by 26.73% and 26.46%, respectively, at 100 °C for 2 h. The results demonstrated that both betaine/lactic acid and betaine/glycerol, are natural solvent with significant potential for breaking down lignin in non-productive oil palm trunks. The findings suggest that betaine-based NaDES are promising for enhancing bioethanol production from oil palm trunks through efficient delignification. © The Author(s), under exclusive licence to Springer Nature B.V. 2025.

关键词： Hydrogen bonds

来源：评论

学校读者我要写书评

暂无评论

Kinetics and Products Distribution Study on the Catalytic Effect of Zn/HZSM-5 over Pyrolysis of Chlorella through TG-FTIR and Py-GC/MS

引用

Journal of Thermal Science 2023年第4期32卷 1635-1643页

作者： WANG Lu YE Tao MA Xianming LIN Yan CHEN Juan WANG Fangbin MA Peiyong LIU Jian School of Food and Biological Engineering Hefei University of TechnologyHefei230009China School of Mechanical Engineering Hefei University of TechnologyHefei230009China Engineering Research Center of Bio-process Ministry of EducationHefei University of TechnologyHefei230009China

In this study,both the pyrolysis and catalytic pyrolysis behaviour of chlorella were investigated using thermogravimetric analysis combined with Fourier Transform Infrared spectrum(TG-FTIR)and Py-GC/*** results of TG indicated the pyrolysis of chlorella was divided into three stages,and the Coats-Redfern kinetic model was used for the analysis and validation of the obtained thermal *** regression coefficients indicated that the pyrolysis of chlorella was close to second-order *** activation energy of pyrolysis of chlorella and catalytic pyrolysis of chlorella+HZSM-5,chlorella+Zn/HZSM-5 was 61.645,59.080 and 56.808 kJ·mol^(−1),*** with the data of FTIR,we found that the addition of the HZSM-5 effectively reduced the activation energy required by pyrolysis;the addition of the Zn/HZSM-5 could not only reduce the activation energy,but also reduce the yield of oxygen-containing compounds,increase the emissions of CO_(2),and facilitate the production of high value-added hydrocarbon *** results were also verified by Py-GC/MS that the addition of Zn/HZSM-5 could reduce the formation of ketones and aldehydes and increase the production of nitrogen-containing ***,through the catalytic pyrolysis of chlorella,the utilization range of chlorella can be expanded,and better bio-oil can be obtained,which will play a crucial role in the selection of available energy in the future.

关键词： catalytic pyrolysis chlorella TG-FTIR kinetic Zn/HZSM-5 Py-GC/MS

来源：评论

学校读者我要写书评

暂无评论

Resource investment for DDoS attack resistant SDN: a practical assessment

引用

Science China(Information Sciences) 2023年第7期66卷 112-129页

作者： Bin YUAN Fan ZHANG Jun WAN Huan ZHAO Shui YU Deqing ZOU Qiangsheng HUA Hai JIN School of Cyber Science and Engineering Huazhong University of Science and Technology National Engineering Research Center for Big Data Technology and System Services Computing Technology and System Lab Hubei Engineering Research Center on Big Data Security Shenzhen Huazhong University of Science and Technology Research Institute School of Computer Science and Technology Huazhong University of Science and Technology Cluster and Grid Computing Lab School of Computer Science University of Technology Sydney

Software-defined networks(SDNs) present a novel network architecture that is widely used in various datacenters. However, SDNs also suffer from many types of security threats, among which a distributed denial of service(DDoS) attack, which aims to drain the resources of SDN switches and controllers,is one of the most common. Once the switch or controller is damaged, the network services can be *** defense schemes against DDoS attacks have been proposed from the perspective of attack detection;however, such defense schemes are known to suffer from a time consuming and unpromising accuracy, which could result in an unavailable network service before specific countermeasures are taken. To address this issue through a systematic investigation, we propose an elaborate resource-management mechanism against DDoS attacks in an SDN. Specifically, by considering the SDN topology, we leverage the M/M/c queuing model to measure the resistance of an SDN to DDoS attacks. Network administrators can therefore invest a reasonable number of resources into SDN switches and SDN controllers to defend against DDoS attacks while guaranteeing the quality of service(QoS). Comprehensive analyses and empirical data-based experiments demonstrate the effectiveness of the proposed approach.

关键词： SDN security DDoS attacks resource management queueing theory QoS

来源：评论

学校读者我要写书评

暂无评论

Investigation on method of characteristics and semi-implicit method for pressure linked equations algorithms for water hammer based on unsteady friction

引用

Journal of Hydrodynamics 2024年第6期36卷 1155-1166页

作者： Zong-ku Liu Guo-hong Wu Hao Wang Jia-xiang Zhang Xue-lin Tang Xiao-qin Li College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System China Agricultural UniversityBeijing100083China State Key Laboratory of Hydroscience and Engineering and Department of Energy and Power EngineeringTsinghua UniversityBeijing100084China

The misoperation of hydraulic components such as pumps and valves in pressurized pipelines triggers water hammer phenomena and seriously threats the safe operation of hydraulic *** present,the main water hammer simulation methods are method of characteristics(MOC),and further investigation of new algorithms is ***,a new method for simulating the water hammer using the finite volume method(FVM),semi-implicit method for pressure linked equations(SIMPLE)algorithm is proposed in the present *** with the experimental data,the accuracy and reliability of the proposed algorithm are *** show that the IAB,MIAB friction models not only predict the first pressure peak but also accurately predict the pressure *** the comparison of the MOC,SIMPLE algorithms,the results of the two algorithms are almost the same in front of the valve,while near the upstream tank,when using the same friction model,the pressure attenuation predicted by the SIMPLE algorithm is slightly greater than that of the MOC method and closer to the experimental ***,the newly proposed algorithm can serve as an alternative to the MOC method in simulating water *** investigation enriches the numerical methods of hydraulic transients and lays the foundation for subsequent program development.

关键词： Hydraulic transient semi-implicit method for pressure linked equations(SIMPLE)algorithm Navier-Stokes equations finite volume method(FVM)

来源：评论

学校读者我要写书评

暂无评论

A Dual-Channel Four-Switch Resonant Gate Driver for LLC Secondary Side MOSFETs 3

A Dual-Channel Four-Switch Resonant Gate Driver for LLC Seco...

引用

3rd International Conference on Power systems and Electrical Technology, PSET 2024

作者： Zhou, Ziyan Luo, Qiang Wang, Yufan Sun, Yuefei Qian, Qinsong Sun, Weifeng Nation ASIC System Engineering & Research Center Southeast University Nanjing China

ISBN: (纸本)9798350353204

Due to its superior soft-switching characteristics, the LLC resonant converter achieves efficient power transmission at high frequencies and is extensively utilized in high power density applications. Conventional drivers exhibit loss that increase proportionally with frequency, resulting in excessive driving loss at high frequencies. To address this, a dual-channel four-switch resonant gate driver (DCFSRGD) is introduced in this paper to drive the secondary-side MOSFETs of the LLC. The proposed DCFSRGD can adjust duty cycles and switching frequencies through appropriate control timing, achieving 82% energy recovery compared to conventional drivers. Unlike other resonant gate drivers used in LLC-DCX applications, this DCFSRGD also facilitates changes in duty cycle and frequency, making it suitable for variable frequency LLC applications. This paper details the operational principles and optimized design methods of the proposed driver. A prototype with a resonant frequency of 1.3 MHz was constructed to validate the effectiveness of the proposed resonant gate driver. © 2024 IEEE.

关键词： HVDC power transmission

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：