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An ILP-Assisted Two-Stage Layout Optimization Method for Satellite Payload Placement

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Space(Science & Technology) 2022年第1期2022卷 85-99页

作者： xiaoqian Chen xianqi Chen yufeng xia Weien Zhou Wen Yao Defense Innovation Institute Chinese Academy of Military ScienceBeijing 100071China College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China

In the satellite overall design phase,it is a crucial step to perform satellite layout design to guarantee that the aggregation of electronic components can operate normally and stably in an appropriate temperature environment.In order to handle the satellite payload placement problem of the DongFangHong 4(DFH-4)platform,the heat pipe-constrained component layout optimization(HCLO)problem is proposed with the HCLO model formulated.Through careful investigation,it can be divided into two optimization subproblems that can be solved subsequently.Based on the divide-and-conquer strategy,an integer linear programming-(ILP-)assisted two-stage layout optimization method is proposed.In stage one,component-heat pipe distribution optimization is performed using the ILP technique so that specific heat pipes occupied by each component can be determined and the horizontal movement range of components can be reduced.In stage two,the detailed component layout optimization is investigated to obtain the final positions of components.First,the sequence layout sampling(SeqLS)method is used to generate one nonoverlap initial layout.Next,swap operation between components is incorporated to reduce the centroid deviation.Finally,sequential quadratic programming(SQP)search is conducted based on the generated promising initial layout solutions.Therefore,the SeqLS-based heuristic layout search algorithm is proposed in the second stage.Two layout test cases,including 15 components and 90 components,respectively,are investigated to demonstrate the validity and efficacy of the proposed layout design method.Experimental results show that it is promising to apply such a two-stage approach for satellite payload placement in engineering.

关键词： payload optimization programming

Cholinergic dysfunction-induced insufficient activation of alpha7 nicotinic acetylcholine receptor drives the development of rheumatoid arthritis through promoting protein citrullination via the SP3/PAD4 pathway

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Acta Pharmaceutica Sinica B 2023年第4期13卷 1600-1615页

作者： Changjun Lv Minghui Sun Yilei Guo Wenxin xia Simiao Qiao Yu Tao Yulai Fang Qin Zhang Yanrong Zhu Yusufu Yalikun yufeng xia Zhifeng Wei Yue Dai Department of Pharmacology of Chinese Materia Medica School of Traditional Chinese PharmacyChina Pharmaceutical UniversityNanjing 211198China Division of Sports Medicine and Adult Reconstructive Surgery Department of Orthopedic SurgeryNanjing Drum Tower Hospitalthe Affiliated Hospital of Nanjing University Medical SchoolNanjing 210008China

Both cholinergic dysfunction and protein citrullination are the hallmarks of rheumatoid arthritis(RA),but the relationship between the two phenomena remains unclear.We explored whether and how cholinergic dysfunction accelerates protein citrullination and consequently drives the development of RA.Cholinergic function and protein citrullination levels in patients with RA and collageninduced arthritis(CIA)mice were collected.In both neuron-macrophage coculture system and CIA mice,the effect of cholinergic dysfunction on protein citrullination and expression of peptidylarginine deiminases(PADs)was assessed by immunofluorescence.The key transcription factors for PAD4 expression were predicted and validated.Cholinergic dysfunction in the patients with RA and CIA mice negatively correlated with the degree of protein citrullination in synovial tissues.The cholinergic or alpha7 nicotinic acetylcholine receptor(a7nAChR)deactivation and activation resulted in the promotion and reduction of protein citrullination in vitro and in vivo,respectively.Especially,the activation deficiency of a7nAChR induced the earlier onset and aggravation of CIA.Furthermore,deactivation of a7nAChR increased the expression of PAD4 and specificity protein-3(SP3)in vitro and in vivo.Our results suggest that cholinergic dysfunction-induced deficient a7nAChR activation,which induces the expression of SP3 and its downstream molecule PAD4,accelerating protein citrullination and the development of RA.

关键词： Rheumatoid arthritis Citrullination Cholinergic dysfunction a7nAChR Peptidylarginine deiminase 4 Specificity protein-3 Collagen-induced arthritis Neuron-macrophage coculture system

Aqueous-solution-driven HfGdO_x gate dielectrics for low-voltage-operated α-InGaZnO transistors and inverter circuits

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Journal of Materials Science & Technology 2020年第15期47卷 1-12页

作者： Yongchun Zhang Gang He Wenhao Wang Bing Yang Chong Zhang yufeng xia School of Physics and Materials Science Radiation Detection Materials&Devices LabAnhui UniversityHefei 230601China Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China College of Mechanical and Electrical Engineering Chuzhou UniversityChuzhou 239000China

In this work,a non-toxic and environmentally friendly aqueous-solution-based method has been adopted to prepare gadolinium-doped hafnium oxide(HfO2) gate dielectric thin films.By adjusting the gadolinium(Gd) doping concentration,the oxygen vacancy content,band offset,interface trap density,and dielectric constant of HfGdOx(HGO) thin films have been optimized.Results have confirmed that HGO thin films with Gd doping ratio of 15 at.% have demonstrated appropriate dielectric constant of 27.1 and lower leakage current density of 5.8×10-9 A cm-2.Amorphous indium-gallium-zinc oxide(α-IGZO) thin film transistors(TFTs) based on HGO thin film(Gd:15 at.%) as gate dielectric layer have exhibited excellent electrical performance,such as larger saturated carrier mobility(μsat) of 20.1 cm2 V-1 S-1,high on/off current ratio(Ion/Ioff) of ~108,smaller sub-threshold swing(SS) of 0.07 V decade-1,and a negligible threshold voltage shift(ΔVTH) of 0.08 V under positive bias stress(PBS) for 7200 s.To confirm its potential application in logic circuit,a resistor-loaded inverter based on HGO/α-IGZO TFTs has been constructed.A high voltage gain of 19.8 and stable full swing characteristics have been detected.As a result,it can be concluded that aqueous-solution-driven HGO dielectrics have potential application in high resolution flat panel displays and ultra-large-scale integrated logic circuits.

关键词： Aqueous-solution-driven Low-voltage-operating HfGdOx gate dielectrics Rare earth element doping α-IGZO TFTs

Diffusion-activated high performance ZnSnO/Yb_(2)O_(3) thin film transistors and application in low-voltage-operated logic circuits

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Journal of Materials Science & Technology 2021年第11期70卷 49-58页

作者： Bing Yang Gang He Wenhao Wang Yongchun Zhang Chong Zhang yufeng xia xiaofen Xu School of Physics and Materials Science Radiation Detection Materials&Devices LabAnhui UniversityHefei 230601China Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China School of Mechanical Engineering Anhui Vocational and Technical CollegeHefei 230011China

The flourishing metal-oxide high-k dielectric materials have been regarded as the vital components of low voltage operated flexible transparent electronic devices.We herein report that ytterbium oxide(Yb_(2)O_(3))and ZnSnO(ZTO)thin films were firstly integrated into ZTO-based thin film transistors(TFTs)with superior performance.Results have indicated that the 500℃-annealed ZTO/Yb_(2)O_(3) TFTs possess the large saturation mobility of 9.1 cm^(2) V-1S^(-1) and the high on/off current ratio of 2.15×10^(7),which even surpass those of reported In-based TFTs.The deteriorative electrical properties in the aging process can be attributed to the carrier capture mechanism.However,the 460℃-processed TFTs demonstrate a tenfold increase in saturated mobility and an increase in on/off current ratio after 10 days aging.The inspiring electrical properties are attributed to the diffusion-activated carrier enhancement mechanism and electrons donor role of water molecular,which introduces a facile method to boost the device performance at lower processing temperatures.The neglected threshold voltage variations of 0.06 V and-0.2V have been detected after bias stability experiments.The superior bias stability can be attributed to the charge delay effect induced by the continuous electric field.Meanwhile,the ultrahigh on/off current ratio of 1.1×10^(7) and the recoverable transferring performance have verified the aging-activated mechanism.To confirm its potential application in digital circuits,a resistor-loaded inverter with gain of 5.6 has been constructed and good dynamic response behavior have been detected at a low voltage of 2V.As a result,it can be concluded that the high temperature annealing TFTs need immediate encapsulation,while the performance of the lower temperature processing samples can be optimized after aging treatment,indicating the potential prospect in low power consumption large-scale flexible transparent devices.

关键词： Ytterbium oxide(Yb_(2)O_(3)) Thin-film transistors(TFTs) Diffusion-activated Bias stability Inverter

Illumination interface stability of aging-diffusion-modulated high performance InZnO/DyO_(x) transistors and exploration in digital circuits

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Journal of Materials Science & Technology 2021年第28期87卷 143-154页

作者： Bing Yang Gang He Qian Gao Wenhao Wang Yongchun Zhang yufeng xia xiaofen Xu Leini Wang Miao Zhang School of Physics and Materials Science Radiation Detection Materials&Devices LabAnhui UniversityHefei230601China Institute of Physical Science and Information Technology Anhui UniversityHefei230601China School of Mechanical Engineering Anhui Vocational and Technical CollegeHefei230011China

In current study,the rare-reported solution-driven DyO_(x)films have been prepared to act as the dielectric layer of high performance InZnO/DyO_(x)thin film transistors(TFTs).Annealing temperature dependent thermal decomposition,morphology,crystallization behavior,and chemical compositions of DyO_(x) and InZnO films have been investigated respectively.Results have demonstrated that air-annealed InZnO/DyO_(x)TFTs possess the improved electrical performance,including ultrahigh on/off current ratio of 1×10^(9),larger saturation mobility of 12.6 cm^(2) V-1 s^(-1) and negligible hysteresis after 10 d aging diffusion in the relative humidity(RH)of 40%air ambient,which has been explored by the variable range-hopping(VRH)percolation model and energy band theory.The distinct illumination bias stability can be attributed to the generated various interface defects and concluded that the white light illuminated TFT behaves the higher stability with the smaller threshold voltage shift of 0.25 V.To confirm its feasible application in digital circuit,a resistor-loaded inverter based on InZnO/DyO_(x)TFTs has been constructed.A high gain of 10.1 and good dynamic response behavior have been detected at a low operating voltage of 2 V.As a result,it can be inferred that diffusion-induced enhanced carrier transporting mechanism is an economical and effective method to optimize the electrical performance of solution-derived InZnO/DyO_(x)TFTs,indicating its potential application prospects in flexible transparent electronics with low power consumption.

关键词： Dysprosium oxide(DyO_(x)) Thin film transistors(TFTs) Aging-diffusion Inverter Illumination bias stability

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数字赋能的共同富裕效应研究

贵州大学学报（社会科学版） 2024年第2期42卷 18-36页

作者：刘魏夏誉凤重庆工商大学成渝地区双城经济圈建设研究院重庆400067 重庆工商大学经济学院重庆400067

实现共同富裕是全体人民共同的美好愿景。数字经济时代,数字要素成为实现共同富裕的新动能。本文利用中国家庭金融调查(CHFS)2017—2019年的微观面板数据,通过基于神经网络赋权的A-F方法构建共同富裕指数、熵值法构建数字赋能指数,并运... 详细信息

实现共同富裕是全体人民共同的美好愿景。数字经济时代,数字要素成为实现共同富裕的新动能。本文利用中国家庭金融调查(CHFS)2017—2019年的微观面板数据,通过基于神经网络赋权的A-F方法构建共同富裕指数、熵值法构建数字赋能指数,并运用混合Tobit、随机效应Tobit、工具变量CMP等多种方法,分析数字赋能对共同富裕的影响效应。研究表明,数字赋能指数每增加1%,共同富裕的发生概率增加14.9%,表明数字赋能有助于实现共同富裕,且数字创造维度赋能的共同富裕效应远高于接入维度赋能和使用维度赋能,主要是由于互联网普及率的提升使多数家庭在数字接入维度和使用维度已无明显差异,而利用数字技术进行各种创造性和创新性活动的差异将日益凸显。数字赋能对共同富裕的助推效应主要体现在数字赋能提高了家庭创业的概率,提高了家庭外出非农就业的概率,增加了家庭获得信贷的机会。不过研究也发现,数字赋能的共同富裕效应存在不同富裕程度、不同人力资本以及城乡之间的异质性,数字赋能在亟需提升共同富裕水平的群体中助推效应较小,而在共同富裕水平较高的群体中助推效应却较大,存在“马太效应”,数字赋能对低技能和高技能群体共同富裕状况的助推效果要大于中等技能群体,数字赋能对农村居民的共同富裕效应要大于城镇居民。本文的研究拓展了共同富裕理论的研究范畴,并为推动数字经济与个体资源有效耦合,进而为助力实现共同富裕提供了经验证据。

关键词：数字赋能共同富裕数字鸿沟家庭创业非农就业条件混合回归

From Pythagoras Theorem to Fermat’s Last Theorem and the Relationship between the Equation of Degree <i>n</i>with One Unknown

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Advances in Pure Mathematics 2020年第3期10卷 125-154页

作者： yufeng xia Huaqiao University Fujian China

The most interesting and famous problem that puzzled the mathematicians all around the world is much likely to be the Fermat’s Last Theorem. However, since the Theorem was proposed, people can’t find a way to solve the problem until Andrew Wiles proved the Fermat’s Last Theorem through a very difficult method called Modular elliptic curves in 1995. In this paper, I firstly constructed a geometric method to prove Fermat’s Last Theorem, and in this way we can easily get the conclusion below: If a and b are integer and?a = b, n ∈ Q and n > 1, the value of c satisfies the function an + bn = cn that can never be integer;if a, b and c are integer and a ≠ b, n is integer and n > 2, the function an + bn = cn cannot be established.

关键词： Pythagoras Theorem Fermat’s Last Theorem Geometric Method Equation of Degree n with One Unknown

针刺与穴电刺激在结直肠癌术后胃肠功能恢复中的研究进展

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深圳中西医结合杂志 2024年第4期34卷 134-136页

作者：夏玉峰邹造峰上海市嘉定区中医院上海201800

随着结直肠癌患病率及死亡率的不断提高,临床对于该疾病治疗策略疗效及预后影响关注度越来越高,尤其是如何促进术后胃肠功能康复已经成为了当前临床上的重要问题,并获得诸多学者关注。当前中医学治疗在康复学研究中应用日益广泛,其中针... 详细信息

随着结直肠癌患病率及死亡率的不断提高,临床对于该疾病治疗策略疗效及预后影响关注度越来越高,尤其是如何促进术后胃肠功能康复已经成为了当前临床上的重要问题,并获得诸多学者关注。当前中医学治疗在康复学研究中应用日益广泛,其中针刺、穴电刺激为中医常用外治疗法,在康复学中应用有着重要使用价值,且作用机制及疗效备受临床认可,并在结直肠癌术后胃肠中获得广泛应用,而研究针刺与穴电刺激在结直肠癌术后胃肠功能恢复中的进展对于中医学治疗推广及应用有着重要机制。

关键词：结直肠癌胃肠功能针刺穴电刺激

Joint Optimization of Trajectory and Task Offloading for Cellular-Connected Multi-UAV Mobile Edge Computing

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Chinese Journal of Electronics 2024年第3期33卷 823-832页

作者： Jingming xia yufeng LIU Ling TAN School of Artificial Intelligence Nanjing University of Information Science and Technology Engineering Research Center of Digital Forensics Ministry of Education Nanjing University of Information Science and Technology

Since the computing capacity and battery energy of unmanned aerial vehicle(UAV) are constrained,UAV as aerial user is hard to handle the high computational complexity and time-sensitive applications.This paper investigates a cellular-connected multi-UAV network supported by mobile edge computing.Multiple UAVs carrying tasks fly from a given initial position to a termination position within a specified time.To handle the large number of tasks carried by UAVs,we propose a energy cost of all UAVs based problem to determine how many tasks should be offloaded to high-altitude balloons(HABs) for computing,where UAV-HAB association,the trajectory of UAV,and calculation task splitting are jointly optimized.However,the formulated problem has nonconvex structure.Hence,an efficient iterative algorithm by applying successive convex approximation and the block coordinate descent methods is put forward.Specifically,in each iteration,the UAV-HAB association,calculation task splitting,and UAV trajectory are alternately optimized.Especially,for the nonconvex UAV trajectory optimization problem,an approximate convex optimization problem is settled.The numerical results indicate that the scheme of this paper proposed is guaranteed to converge and also significantly reduces the entire power consumption of all UAVs compared to the benchmark schemes.

关键词： Energy consumption Multi-access edge computing Costs Power demand Autonomous aerial vehicles Iterative algorithms Convex functions