检索结果-内蒙古大学图书馆

Scalable hardware architecture for fast gradient boosted tree training

IPSJ Transactions on System LSI design Methodology 2021年 14卷 11-20页

作者： Sadasue, Tamon Tanaka, Takuya Kasahara, ryosuke darmawan, Arief Isshiki, Tsuyoshi Innovation R&D Division RICOH Company Ebina Kanagawa243–0460 Japan Information and Communications Engineering Tokyo Institute of Technology Ohta Tokyo152–8550 Japan

Gradient Boosted Tree is a powerful machine learning method that supports both classification and regression, and is widely used in fields requiring high-precision prediction, particularly for various types of tabular data sets. Owing to the recent increase in data size, the number of attributes, and the demand for frequent model updates, a fast and efficient training is required. FPGA is suitable for acceleration with power efficiency because it can realize a domain specific hardware architecture;however it is necessary to flexibly support many hyper-parameters to adapt to various dataset sizes, dataset properties, and system limitations such as memory capacity and logic capacity. We introduce a fully pipelined hardware implementation of Gradient Boosted Tree training and a design framework that enables a versatile hardware system description with high performance and flexibility to realize highly parameterized machine learning models. Experimental results show that our FPGA implementation achieves a 11- to 33-times faster performance and more than 300-times higher power efficiency than a state-of-the-art GPU accelerated software implementation. © 2021 Information Processing Society of Japan.

关键词： Field programmable gate arrays (FPGA)

来源：评论

学校读者我要写书评

暂无评论

design and research of High-Speed Sampling System Based on ZYNQ

Design and Research of High-Speed Sampling System Based on Z...

引用

International Conference on Artificial Intelligence and Computer Information technology (AICIT)

作者： Min Guangyao Huang Yuanfeng Luo Qiquan Lei Yuanlin School of Electrical and Information Engineering Wuhan Institute of Technology Wuhan China First R&D Department Wuhan Hangjiu Electric Company Wuhan China

ISBN: (数字)9798350365443

ISBN: (纸本)9798350365450

dCcurrent-limiting fuses play a crucial role in integrated electrical power systems for ships, rail transit, and new energy fields, ensuring the safe and reliable operation of dC power systems. With the increasing capacity and complexity of dC power systems, there are higher demands on the rapid and accurate determination of short circuit faults and the monitoring of critical device statuses within dC current-limiting fuses during operation. Therefore, enhancing the speed and accuracy of sampling data becomes a critical factor in designing dC current-limiting fuse measurement and control systems. In this paper, a high-speed sampling system based on ZYNQ is designed to achieve rapid and accurate sampling of voltage and current data in the system, providing data for the measurement and control system for further data processing. By integrating the dual-core ZYNQ chip with the high-throughput sampling chip Ad7606, voltage and current are sampled at a speed of 200KSPS, ensuring rapid accuracy from a hardware perspective. The Ad7606 driver code is designed using state machine principles. The internal communication between the PS and PL ends of ZYNQ is achieved through AXI bus design, ensuring rapid accuracy from a software perspective. This paper also introduces the construction of the system's software, hardware design, and simulation experiment platform. Simulation and experimental results demonstrate that the sampling system achieves fast high-precision multi-channel sampling and accurate data communication across both sides of the chip.

关键词： Semiconductor device measurement Accuracy Voltage measurement Fuses Current measurement Control systems Hardware Power system reliability data communication Voltage control

来源：评论

学校读者我要写书评

暂无评论

Casing shearing failure in shale gas wells due to fault slippage caused by hydraulic fracturing-case study

Casing shearing failure in shale gas wells due to fault slip...

引用

Abu dhabi International Petroleum Exhibition and Conference 2020, AdIP 2020

作者： Liu, Kui Chen, Zhaowei Zeng, Yijin Cao, Hu Tao, Qian Wang, Zhifa Zhang, Hongbao Sinopec Research Institute of Petroleum Engineering CNPC Engineering Technology R&D Company Limited China University of Petroleum Beijing China

ISBN: (纸本)9781613997345

According to the analysis of casing deformation events and the achieved micro-seismic data in four shale gas wells, the slip of the fault is treated as the main reason for casing deformation problems in shale gas wells in Changing. Analytical model for calculating fault slippage is established based on elastic mechanics and the slippage of faults around 4 shale gas wells is calculated. The calculated results show that both the height of fault reactivation area and the angle between the maximum in-situ stress and fault have significant effect on the fault slippage. The location of the intersection point where casing goes through the reactivation area of fault can significantly affect the casing deformation. The closer the intersection point is to the center of reactivation area, the larger fault slippage and the serious casing deformation occurs. Case study in well Ning201-H1 shows that the slippage of fault at total depth 3490 of this well is 30.5mm, and the corresponding casing deformation is 10.5mm which is in agreement with field data. The casing deformation in drilling platform H19 is much more serious due to the extremely complicated faults and the large reactivation area. The maximum casing deformation reaches 35mm in well H19-5. The results of this study have significant reference value for understanding the mechanism and controlling methods for casing deformation in shale gas wells during hydraulic fracturing treatment. Copyright © 2020, Society of Petroleum Engineers

关键词： deformation

来源：评论

学校读者我要写书评

暂无评论

Novel spherical polymer sealing agent for oil-based drilling fluids to overcome borehole instability problem in low permeability reservoirs 4th

Novel spherical polymer sealing agent for oil-based drilling...

引用

4th International Conference on New Material and Chemical Industry, NMCI 2019

作者： Li, Long Cheng, rongchao Ma, Cha Zhang, Jie Jiangxi Science and Technology Normal University Nanchang330013 China CNPC Engineering Technology R&D Company Limited Beijing100083 China

ISBN: (纸本)9783035716511

due to borehole instability problem in low permeability formations, a new type of spherical polymer sealing agent (OLBS) for oil-based drilling fluids was prepared via suspension polymerization, and the sealing effect of polymer sealing agent on low permeability cores was evaluated. The results indicated that OLBS had no influence on the rheological properties of oil-based drilling fluids. The core displacement experiments indicated that OLBS could reduce the core permeability by a significant amount, and thus stop fluid invasion into the formations, so OLBS could provide an excellent sealing effect and improve wellbore strength. Using this polymer sealing agent to plug the low permeability formations is a very powerful approach to address borehole instability problem in troublesome low permeability formations. This sealing agent is suitable for the drilling of long sections of horizontal laterals. In the future, the oil-based drilling fluids containing OLBS might hold great promise to resolve borehole instability problem in low permeability formations. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Low permeability reservoirs

来源：评论

学校读者我要写书评

暂无评论

Hydrate reformation Characteristics in Offshore Natural Gas Hydrate reservoir Using the Horizontal Well depressurization Production

Hydrate Reformation Characteristics in Offshore Natural Gas ...

引用

Offshore technology Conference, OTC 2025

作者： Zhang, Jianbo Liu, Xiaoao Luo, Jiazheng Sun, Xiaohui Zhong, Jie Wang, Zhiyuan Huang, Weian Sun, Baojiang Wang, Xiao School of Petroleum Engineering China University of Petroleum East China Shandong Qingdao China Shandong Key Laboratory of Offshore Oil & Gas and Hydrates Development Shandong Qingdao China CNPC Engineering Technology R&D Company Limited Beijing China No.7 Oil Production Plant PetroChina Changqing Oilfield Company Shanxi Xian China College of Computer Science and Technology China University of Petroleum East China Qingdao China School of Materials Science and Engineering China University of Petroleum East China Qingdao China

ISBN: (纸本)9781959025610

during depressurization production of natural gas hydrate, the reformation of hydrate is likely to occur in the reservoir, hindering the efficient development of hydrate. Previous studies on the reformation of hydrate in the process of natural gas hydrate production were mainly focused on experimental research and numerical simulation under experimental conditions. In this work, a multi-field coupling flow model considering the effect of hydrate reformation during depressurization production of hydrate reservoir was established, and the accuracy of the model was verified by the field measured data. Meanwhile, the reformation characteristics of hydrate in the reservoir using the horizontal well depressurization production were simulated and investigated. The results show that the reformation of hydrate in the reservoir mainly occurs in the upper part and middle boundary of the hydrate decomposition zone during the depressurization production. Moreover, the smaller the pressure drop extent, absolute permeability and initial hydrate saturation, and the deeper the horizontal well, the larger the hydrate secondary formation zone in the reservoir, the faster the rate of hydrate reformation, and the greater the hydrate saturation caused by hydrate reformation would be, which would make the risk of flow blockage by reformed hydrate in the reservoir rise. The results of this study can provide theoretical support for the safe and efficient development of offshore natural gas hydrate. © 2025, Offshore technology Conference.

关键词： Offshore gas well production

来源：评论

学校读者我要写书评

暂无评论

Assessing Two-Well-Horizontal Caverns for Compressed Air Energy Storage in Low-Grade Salt rocks

SSRN

引用

SSrN 2024年

作者： Li, Qihang Liu, Wei Jiang, Liangliang Qin, Jianxu Wan, Jifang Zhu, Xuanshi State Key Laboratory of Coal Mine Disasters Dynamics and Control Chongqing University Chongqing400044 China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan430071 China Department of Chemical and Petroleum Engineering the University of Calgary CalgaryAB Canada CNPC Engineering Technology R&D Company Limited Beijing102206 China

To advance the development and deployment of compressed air energy storage (CAES) in underground salt caverns (USCs) for a carbon-resilient society, a comprehensive stability assessment is essential to ensure the safe operation of underground salt cavern gas storage (SCGS). In China, around 85% of low-grade salt rock features two-well-horizontal (TWH) caverns, which are notable for their high sediment content (SC) and restricted usable space. This study addresses the challenges associated with sedimentary voids energy storage and the stability of TWH-caverns for large-scale energy storage (LSES). We present a theoretical model for the volumetric inversion of TWH-caverns, based on salt extraction, salt layer characteristics, and interlayer ratio, using data from a low-grade salt mine in Feicheng City, China. We simulated the volume loss rate (VLr), displacement, and plastic zone volume (PZV) for various levels of high SC (50%, 60%, 70%, 80%, 90%) and internal air pressure (IAP) (8.1 MPa, 9.45 MPa, 21.6 MPa) in the roof, waist, and connected areas of both high and low caverns within the TWH-cavern. The results reveal that the creep characteristics of the high cavern are more pronounced, and the combined effects of SC and IAP effectively limit roof deformation. However, the displacement of the high cavern waist increases by 0.028 m (IAP = 8.1 MPa) and 0.006 m (IAP = 21.6 MPa) as SC rises from 80% to 90%. In the connected area, displacement values increase from 0.634 m to 0.852 m (IAP = 8.1 MPa) as SC increases from 50% to 90%. These findings highlight that the sediment surface is a critical factor in assessing the impact of SC on cavern deformation. The cavern roof remains the most critical component for ensuring the safe operation of SC- CAES. We propose effective measures to enhance roof stability and suggest establishing an intelligent big data platform to ensure the secure operation of low-grade SC-CAES. Accordingly, this study provides a theoretical basis for eval

关键词： digital storage

来源：评论

学校读者我要写书评

暂无评论

Comprehensive Safety Assessment Of Two-Well-Horizontal Caverns with Sediment Space For Compressed Air Energy Storage In Low-Grade Salt rocks

SSRN

引用

SSrN 2024年

作者： Li, Qihang Liu, Wei Jiang, Liangliang Qin, Jianxu Wan, Jifang Zhu, Xuanshi State Key Laboratory of Coal Mine Disasters Dynamics and Control Chongqing University Chongqing400044 China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan430071 China Department of Chemical and Petroleum Engineering The University of Calgary CalgaryAB Canada CNPC Engineering Technology R&D Company Limited Beijing102206 China

To expedite the construction and implementation of compressed air energy storage (CAES) in under- ground salt caverns (USCs), conducting a thorough stability assessment is crucial to ensure the safe operation of underground salt cavern gas storage (SCGS). In China, around 85% of low-grade salt rock features two-well-horizontal (TWH) caverns, which are notable for their high sediment content (SC) and restricted usable space. Herein this study addresses the challenges associated with sediment voids energy storage and the stability of TWH-caverns for large-scale energy storage (LSES). We present a theoretical model for the volumetric inversion of TWH-caverns, based on salt extraction, salt layer characteristics, and interlayer ratio, using data from a low-grade salt mine in Feicheng City, China. We simulated the volume loss rate (VLr), displacement, and plastic zone volume (PZV) for various levels of high SC (50%, 60%, 70%, 80%, 90%) and internal air pressure (IAP) (8.1 MPa, 9.45 MPa, 21.6 MPa) in the roof, waist, and connected areas of both high and low caverns within the TWH-cavern. The results reveal that the creep characteristics of the high cavern are more pronounced, and the combined effects of SC and IAP effectively limit roof deformation. However, the displacement of the high cavern waist increases by 0.028 m (IAP = 8.1 MPa) and 0.006 m (IAP = 21.6 MPa) as SC rises from 80% to 90%. In the connected area, displacement values increase from 0.634 m to 0.852 m (IAP = 8.1 MPa) as SC increases from 50% to 90%. These findings highlight that the sediment surface is a critical factor in assessing the impact of SC on cavern deformation. The cavern roof remains the most critical component for ensuring the safe operation of SC-CAES. We propose effective measures to enhance roof stability and suggest establishing an intelligent big data platform to ensure the secure operation of low-grade SC-CAES. Accordingly, this study provides a theoretical basis for evaluating the safet

关键词： digital storage

来源：评论

学校读者我要写书评

暂无评论

IoT-driven defect detection System for Plastic recycling Plants Based on Convolutional Neural Networks 2

IoT-Driven Defect Detection System for Plastic Recycling Pla...

引用

2nd International Conference on Self Sustainable Artificial Intelligence Systems, ICSSAS 2024

作者： Madhiraju, Priyanka Sampathrajan, rajeshkumar Pattnaik, Manjula rajalakshmi, P. dhivya, K. Murugan, S. Matrusri Engineering College Department of Computer Science and Engineering Telangana Hyderabad India McKinsey & Company Fort WorthTX United States Princess Nourah Bint Abdulrahman University College of Business and administration Accounting Department Saudi Arabia Vel Tech Rangarajan Dr.Sagunthala R&d Institute of Science and Technology Department of Computer Science and Engineering Tami Nadu Chennai India Srm Institute of Science and Technology Department of Electronics and Communication Engineering Kattankulathur Tamil Nadu Chennai India Saveetha Institute of Medical and Technical Sciences Saveetha University Saveetha School of Engineering Department of Biomedical Engineering Tamil Nadu Chennai India

ISBN: (纸本)9798350368413

To improve the accuracy of plastic recycling facilities this paper introduces an Internet of Things (IoT)driven defect detection system that uses Convolutional Neural Networks (CNNs). Traditional techniques of fault identification are time-consuming and prone to human error, which makes plastic recycling less than ideal from an environmental sustainability perspective. To track the movement of plastics in real time, the system makes use of IoT sensors placed all throughout the recycling facility. To correctly detect plastic material flaws like contamination, discoloration, or physical damage, this data is then input into a CNNs model that has been tuned for image analysis. The proposed system outperforms conventional approaches in terms of efficiency and accuracy of flaw identification, as shown by rigorous testing. This method improves the quality and longevity of plastic recycling operations while simultaneously streamlining defect identification procedures via the use of IoT technology and CNNs. The IoT presents exciting new methods to lessen the negative effects of plastic recycling facilities on the environment while simultaneously increasing their efficiency and effectiveness, meeting the growing demand for environmentally friendly waste management solutions throughout the world. © 2024 IEEE.

关键词： Plastics plants

来源：评论

学校读者我要写书评

暂无评论

Effects of glycine, l-arginine and their complexation with polyvinylpyrrolidone on tetrahydrofuran hydrate formation 4th

Effects of glycine, l-arginine and their complexation with p...

引用

4th International Conference on Material engineering and Manufacturing, ICMEM 2020, the 3rd International Conference on Materials design and Applications, ICMdA 2020, and the 2nd International Conference on Biomacromolecules and Biomimetic Materials, ICBBM 2020

作者： rong, Kesheng Shi, Xiaomei Gong, Jiaqin Wang, Qibing Liu, Kecheng Qu, Yuanzhi Yao, Xuyang Engineering Technology Research Institute of Xinjiang Oilfield Company Karamay834000 China CNPC Engineering Technology R & D Company limited Beijing102206 China China University of Petroleum Qingdao266580 China

ISBN: (纸本)9783035716887

Hydrophilic amino acids as a new type hydrate inhibitor is a hot topic for scholars. In this paper, the influence of glycine and L-arginine, and their complexation with polyvinylpyrrolidone (PVP) on hydrate formation were clarified by tetrahydrofuran (THF) hydrate formation simulation experiments, and the intrinsic influence mechanism was revealed by many experimental methods. The results show that glycine has a strong inhibitory effect on water molecules because of its strong disturbance to water molecules, and the inhibitory effect is the best when the addition of glycine is 1.0 wt%. due to the disturbance and binding of hydrophilic amino acids to water molecules, the effect of PVP on the semi-cage structure of water molecules as well as the adsorption and encapsulation of hydrate crystal particles, the combination of glycine and L-arginine and PVP has synergistic inhibitory effect on the formation of THF hydrate. When the total amount of hydrate inhibitor is 1.0 wt%, the synergistic inhibition ability of glycine and PVP is stronger. The results obtained in this paper provide an experimental and theoretical basis for the research and development of new hydrate inhibitors. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Hydration

来源：评论

学校读者我要写书评

暂无评论

Preparation and stabilization mechanism of carbon dots nanofluids for drag reduction

引用

Petroleum Science 2020年第6期17卷 1717-1725页

作者： Yi-Ning Wu Yuan Li Meng-Jiao Cao Cai-Li dai Long He Yu-Ping Yang Shandong Key Laboratory of Oilfi eld Chemistry School of Petroleum EngineeringChina University of Petroleum(East China)Qingdao 266580China Petroleum Engineering Institute Northwest Branch of SinopecUrumchi 830000China CNPC Engineering Technology R&D Company Limited Beijing 100007China

during the development of low or ultra-low permeability oil resources,the alternative energy supply becomes a prominent *** recent years,carbon dots(Cds)have drawn much attention owing to their application potential in oil fields for reducing injection pressure and augmenting oil ***,carbon dots characterized of small size,high surface energy are faced with several challenges,such as self-aggregation and *** preparation of stably dispersed carbon dots nanofluids is the key factor to guarantee its application performance in *** this work,we investigated the stability of hydrophilic carbon dots(HICds)and hydrophobic carbon dots-Tween 80(HOCds)*** influences of carbon dots concentration,sorts and concentration of salt ions as well as temperature on the stability of Cds were *** results showed that HICds are more sensitive to sort and concentration of salt ions,while HOCds are more sensitive to *** addition,the core flooding experiments demonstrated that the pressure reduction rate of HICds and HOCds nanofluids can be as high as 17.88%and 26.14%,***,the HICds and HOCds nanofluids show a good application potential in the reduction of injection pressure during the development of low and ultra-low permeability oil resources.

关键词： Carbon dots Nanofluids drag reduction Stabilization mechanism Salt tolerance

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：