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29th International Joint Conference on Artificial Intelligence, IJCAI 2020

作者： Sun, Penghao Guo, Zehua Wang, Junchao Li, Junfei Lan, Julong Hu, Yuxiang National Digital Switching System Engineering and Technological R&D Center Beijing Institute of Technology China

ISBN: (纸本)9780999241165

To improve the processing efficiency of jobs in distributed computing, the concept of coflow is proposed. A coflow is a collection of flows that are semantically correlated in a multi-stage computation task. A job consists of multiple coflows and can be usually formulated as a directed-Acyclic Graph (dAG). A proper scheduling of coflows can significantly reduce the completion time of jobs in distributed computing. However, this scheduling problem is proved to be NP-hard. different from existing schemes that use hand-crafted heuristic algorithms to solve this problem, in this paper, we propose a deep reinforcement Learning (drL) framework named deepWeave to generate coflow scheduling policies. To improve the inter-coflow scheduling ability in the job dAG, deepWeave employs a Graph Neural Network (GNN) to process the dAG information. deepWeave learns from the history workload trace to train the neural networks of the drL agent and encodes the scheduling policy in the neural networks, which make coflow scheduling decisions without expert knowledge or a pre-assumed model. The proposed scheme is evaluated with a simulator using real-life traces. Simulation results show that deepWeave completes jobs at least 1.7× faster than the state-of-the-art solutions. © 2020 Inst. Sci. inf., Univ. defence in Belgrade. All rights reserved.

关键词： reinforcement learning

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Bird-mimetic Wing System of Flapping-wing Micro Air Vehicle with Autonomous Flight Control Capability

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Journal of Bionic engineering 2016年第3期13卷 458-467页

作者： Sriyulianti Widhiarini Ji Hwan Park Bum Soo Yoon Kwang Joon Yoon ll-Hyun Paik Jong Heon Kim Chan Yik Park Seung Moon Jun Changho Nam Department of Aerospace Engineering Konkuk University Gwangjin-gu Seoul South Korea Deptartment of PGM Technology Hanwha Corp. R&D Center Daejeon South Korea Agency for Defense Development Daejeon South Korea Department of Engineering Technology Arizona State University Mesa Arizona

A micro air vehicle with a bird-mimetic up-down and twisting wing drive system was developed in this study. The Flap- ping-wing Micro Air Vehicle （FMAV）, with a 50 cm wingspan and a double-crank drive system, performed successful flights of up to 23 min. The performance and capabilities of the FMAV were enhanced by adapting a number of unique features, such as a bird-mimetic wing shape with a span-wise camber and an up-down and twisting wing drive mechanism with double-crank linkages, This lift-enhancing design by mimicking the flapping mechanism of a bird＇s wing enabled the 210 g FMAV to fly autonomously in an outdoor field under wind speeds of less than 5 m.s-1. Autonomous flight was enabled by installing a flight control computer with a micro-electro-mechanical gyroscope and accelerometers, along with a micro video camera and an ultralight wireless communication system inside the fuselage. A comprehensive wind tunnel test shows that the FMAV with a high-camber wing and double-crank mechanism generates more lift and less net thrust than the FMAV with a flat wing and single-crank mechanism, which confirms the improved performance of the developed FMAV, as well as the superior slow flying or hovering capabilities of the FMAV with a high-camber wing and double-crank wing drive system.

关键词： flapping-wing MAV autonomous flight biomimetic wing double crank wing

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Evaluation the Properties of Titanium Matrix Composites by Melting route Synthesis

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Journal of Materials Science & technology 2008年第1期24卷 105-109页

作者： Bong-Jae Choi Si-Young Sung Myoung-Gyun Kim Young-Jig Kim Department of Advanced Materials Engineering Sungkyunkwan University SuwonKorea Department of Advanced Materials Engineering Sungkyunkwan University SuwonKorea Materials & Processing Engineering CenterR&D DivisionKorea Automotive Technology InstituteChonanChungnamKorea Research Institute of Industrial Science and Technology Pohang Korea

The main purpose of this study is an in-situ synthesis of （TiB＋TiC） hybrid titanium matrix composites （TMCs） by vacuum induction melting method and to verify its mechanical *** melting route was adopted to synthesize the commercial pure titanium （cp Ti） and granular boron carbide （B-4C）.The reinforcements,the fraction of 10 ***,were formed by adding 1.88 wt pct B-4C to cp *** in-situ synthesis of TMCs,electron probe micro-analysis elemental mapping was carried out to confirm the distribution and shape of *** cone-on-disk type sliding wear test was also done for the identification of *** is concluded that （TiB＋TiC） hybrid TMCs can be in-situ synthesized and has better wear properties than H13.

关键词： Titanium matrix composites H13 In-situ Wear

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recent Advances in directed Assembly of Nanowires or Nanotubes

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Nano-Micro Letters 2012年第3期4卷 142-153页

作者： Mei Liu Zhizheng Wu Woon Ming Lau Jun Yang School of Mechatronics Engineering and Automation Shanghai University State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences Green Energy and Green Manufacturing Technology R&D Center Department of Mechanical and Materials Engineering the University of West ern Ontario

Nanowires and nanotubes of diverse material compositions,properties and/or functions have been produced or fabricated through various bottom-up or top-down *** nanowires or nanotubes have also been utilized as potential building blocks for functional *** key for the integration of those nanowire or nanotube based devices is to assemble these one dimensional nanomaterials to specific locations using techniques that are highly controllable and *** such techniques should enable assembly of highly uniform nanowire/nanotube arrays with precise control of density,location,dimension or even material types of nanowires/*** assembly techniques are being developed that can quickly align and assemble large quantities of one type or multiple types of nanowires through parallel processes,including flow-assisted alignment,Langmuir-Blodgett assembly,bubble-blown technique,electric/magnetic-field directed assembly,contact/roll printing,knocking-down,etc..With these assembling techniques,applications of nanowire/nanotube based devices such as flexible electronics and sensors have been *** paper delivers an overall review of directed nanowire/nanotube assembling approaches and analyzes advantages and limitations of each *** future research directions have also been discussed.

关键词： Nanowire Nanotube Assembly Shear force Contact printing dielectrophoresis Microfluidics Nanosystems Nanodevices

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Ultrathin polyamide nanofiltration membrane prepared by triazine-based porous organic polymer as interlayer for dye removal

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Chinese Journal of Chemical engineering 2023年第5期57卷 193-201页

作者： Yongbo Liu Zhihao Si Cong ren Hanzhu Wu Peng Zhan Yuqing Peng Peiyong Qin National Energy R&D Center for Biorefinery Beijing University of Chemical TechnologyBeijing 100029China College of Life Science and Technology Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Membrane Science and Technology College of ChemicalEngineeringBeijing University of Chemical TechnologyBeijing 100029China

Separation membrane with high flux is generally encouraged in industrial application,because of the tremendous needs for decreasing membrane areas,usage costs and space *** most effective and direct method for obtaining the high flux is to decrease membrane ***(PA)nanofiltration membrane is conventionally prepared by the direct interfacial polymerization(IP)on substrate surface,and results in a thick PA *** this work,we proposed a strategy that constructing triazine-based porous organic polymer(TrZ-POP)as the interlayer to prepare the ultrathin PA nanofiltration ***-POP is firstly deposited on the polyethersulfone substrate,and then the formed TrZ-POP provides more adhesion sites towards PA based on its high specific surface *** chemical bonding between terminal amine group of TrZ-POP and the amide group of PA further improves the binding force,and strengthens the stability of PA *** importantly,the high porosity of TrZPOP layer causes the higher polymerization of initial PA owning to the stored sufficient amino monomer;and H-bonding interaction between amine groups of TrZ-POP and piperazine(PIP)can astrict the release of ***,IP process is controlled,and the thinnest thickness of prepared PA layer is only<15 *** expected,PA/TrZ-POP membrane shows a more excellent water flux of 1414 L·m^(-2)·h^(-1)·MPa^(-1)than that of the state-of-the-art nanofiltration membranes,and without sacrificing dye *** build of TrZPOP interlayer develops a new method for obtaining a high-flux nanofiltration membrane.

关键词： Polyamide Nanofiltration Interfacial polymerization Triazine-based porous organic polymer

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Transmit scheme to improve coverage in simulcast system based on wideband channel measurement in indoor at 6 GHz

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The Journal of China Universities of Posts and Telecommunications 2013年第2期20卷 48-53,72页

作者： XIN Liang ZHANG Jian-hua GAO Jun-jun LI Xiao-fan Chipset R&D-Systems Engineering-Systems Design VIATelecom Wireless Technology Innovation Institute Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications State Ratio-monitoring-center Testing Center

Array gain would be well exploited to improve power coverage if some powerful multipath components from different radio links can coherently combine at the receiver （rx）. Thus, in this paper, an algorithm is proposed for transmission in simulcast system, where partial channel state information （CSI） is needed. Based on measured multipath channel, performance of the proposed algorithm is evaluated. According to simulation results, the proposed algorithm outperforms the direction summation （dS） scheme and multipath antenna diversity （MAd） algorithm, with 2～4 dB advantage over the latters. Especially in line of sight （LOS） scenario, the advantage is more obvious. Besides, the proposed algorithm brings more gain with increasing number of transmit antennas without additional power. Finally, robustness of the proposed algorithm is examined with imperfect CSI.

关键词： channel measurement delay difference phase rotation coverage robustness

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Effects of edpetiline from Fritillaria on inflammation and oxidative stress induced by LPS stimulation in rAW264.7 macrophages

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生物化学与生物物理学报（英文版） 2021年第2期53卷 229-237页

作者： Hongli Zhang Xiaoqing Xu Zhenhua Liu dongxiao Sun-Waterhouse Jinmei Wang Changyang Ma Geoffrey I.N.Waterhouse Wenyi Kang National R&D Center for Edible Fungus Processing Technology Henan UniversityKaifeng 475004China Joint International Research Laboratory of Food&Medicine Resource Function of Henan Province Kaifeng 475004China School of Chemical Sciences University of AucklandAuckland 1142New Zealand National R&D Center for Edible Fungus Processing Technology Henan UniversityKaifeng 475004China Functional Food Engineering Technology Research Center of Henan Province Kaifeng 475004China

The dry bulbs of Fritillaria cirrhosa species can help resolve phlegm,soothe cough,clear heat,and moisten the lung,and the main active components responsible for these effect are its ***,it is unclear whether or how edpetiline in Fritillaria can inhibit the excessive inflammatory response and oxidative *** this research,we aimed to examine this aspect using lipopolysaccharide(LPS)-stimulated rAW264.7 macrophages as an inflammatory *** quantitative real-time polymerase chain reaction and western blot analysis results showed that edpetiline significantly inhibited the content and mrNA expression levels of proinflamma-tory cytokines(TNF-αand IL-6)in LPS-induced rAW264.7 cells,significantly increased the mrNA expression of IL-4(anti-inflammatory cytokine),and markedly downregulated the inflammatory mediators inductible nitric oxide synthase(iNOS)and cyclooxygenase-2(COX-2)mrNA and pro-tein expression *** oxidative stress induced by LPS was also inhibited by edpetiline,as the level of intracellular reactive oxygen species decreased *** may exert anti-inflammatory and antioxidant effects through inhibiting the phosphorylation of IκB and the nuclear transcription of nuclear transcription factor-κB p65 and decreasing the phosphorylation of p38 and ErK in the mitogen-activated protein kinase signaling pathway,without activating the JNK/mitogen-activated protein kinase signaling *** findings suggest that edpetiline may be a potential therapeutic agent for the prevention or treatment of inflammation-and oxidative stress-related pathophysiological processes and diseases.

关键词： edpetiline anti-inflammation anti-oxidation reactive oxygen species rAW264.7 macrophages

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real-time porosity reduction during metal directed energy deposition using a pulse laser

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Journal of Materials Science & technology 2022年第21期116卷 214-223页

作者： Hoon Sohn Peipei Liu Hansol Yoon Kiyoon Yi Liu Yang Sangjun Kim Department of Civil and Environmental Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Center for 3D Printing Nondestructive Testing Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Global R&D Center SQ EngineeringSeoul 05818Republic of Korea Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Porosity is a challenging issue in additive manufacturing and is detrimental to the quality of the additively manufactured *** this study,a real-time porosity reduction technique was developed by incorporating a pulse laser into a laser metal powder directed energy deposition(dEd)*** incorporated pulse laser can accelerate fluid flow within the melt pool and facilitate the escape of pores before complete *** achieves this real-time porosity reduction by inducing accelerated and turbulent Marangoni flow,ultrasonic waves,and shock waves into the melt *** uniqueness and advantages of the proposed technique include the following:(1)For a laser metal powder dEd process,this study proposed a noncontact,nondestructive,and real-time porosity reduction technique at the melt pool level.(2)It was experimentally and numerically validated that the developed technique did not alter the geometry and the grain structure of the manufactured Ti-6Al-4V samples.(3)Because the porosity reduction is accomplished at the melt pool level,its application is not limited by the size,shape,or complexity of the printing target.(4)The developed technique can be readily incorporated into the existing dEd systems without any modification of the original tool-path *** experimental results showed that the pore volume fraction decreased from 0.132%to 0.005%,no pores larger than 6×10^(4)μm^(3) were observed,and a 91%reduction in the total pore number was achieved when the pulse laser energy reached 11.5 mJ.

关键词： real-time porosity reduction Pulse laser Melt pool directed energy deposition Ti-6Al-4V

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development of an Oil-Well downhole Behavior Classification Method Based on Pressure Parameters 1

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Feng, Xin Jia, Heng-Tian National Engineering Research Center of Oil and Gas Drilling and Completion Technology CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (数字)9789819704798

ISBN: (纸本)9789819704781

Automated processing of downhole engineering parameters and intelligent classification of working conditions play an important role in improving production efficiency and promoting the production process of oil fields. However, in the offline interpretation process of long-term downhole pressure parameters, the huge amount of data storage and uncertain downhole noise and interference can seriously affect and delay the interpretation of engineering parameters. At the same time, inaccurate and incomplete collection of downhole parameter feature extraction methods, improper selection, and optimization of downhole behavior classification mechanisms, etc., can seriously restrict the rapid and accurate extraction of pressure features, making the correct classification of downhole working conditions face greater challenges. In this paper, wavelet, time-domain, and gradient features of the downhole pressure parameters were extracted, and three methods including, neural network, support vector machine and K-nearest neighbor method, were used to classify the working conditions. By comparing the processing results under the interaction of different types of features and different behavior classification mechanisms, a classification method for downhole working conditions based on pressure parameters was optimized. The results show that the application of the optimal behavior classification method based on the optimal multi-feature has both small deviation in pressure parameters and high accuracy in working condition classification. This method provides a feasible data analysis method for downhole parameters. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Classification (of information)

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Effects of grape seed extract on meat color and premature browning of meat patties in high-oxygen packaging

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Journal of Integrative Agriculture 2022年第8期21卷 2445-2455页

作者： YANG Xiao-yin XU Bao-chen LEI Hong-mei LUO Xin ZHU Li-xian ZHANG Yi-min MAO Yan-wei LIANG rong-rong Laboratory of Beef Processing and Quality Control College of Food Science and EngineeringShandong Agricultural UniversityTai’an 271018P.R.China National R&D Center for Beef Processing Technology Tai’an 271018P.R.China

This study investigated the effects of grape seed extract(GSE)on fresh and cooked meat color and premature browning(PMB)in ground meat patties(85% beef and 15% pork back fat)packaged under high-oxygen modified atmospheres(HiOx-MAP).The GSE was added to patties at concentrations of 0,0.10,0.25,0.50 and 0.75 g kg^(-1).This study evaluated the surface color,pH,lipid oxidation,and total viable counts(TVC)of raw patties,and the internal color and pH of patties cooked to a temperature of 66 or 71℃ over 10-day storage at 4℃.Compared with the control(0 g kg^(-1) GSE),GSE improved the color stability(P<0.05)and significantly inhibited the lipid and myoglobin oxidation of raw patties from day 5 to 10,but GSE had no effect(P>0.05)on *** containing 0.50 and 0.75 g kg^(-1) GSE cooked to 66℃ exhibited greater(P<0.05)interior redness than the control and reduced the PMB of cooked patties in the late storage *** results suggested that 0.50 and 0.75 g kg^(-1) GSE can improve fresh meat color and minimize PMB of HiOx-MAP patties.

关键词： ground meat patties grape seed extract meat color premature browning high oxygen packaging lipid oxidation

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