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Intelligent reflecting surface assisted untrusted NOMA transmissions: a secrecy perspective

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Science China(Information Sciences) 2023年第9期66卷 226-238页

作者： Dawei WANG Xuanrui LI yixin he Fuhui ZHOU Qihui WU School of Electronics and Information Northwestern Polytechnical University Research & Development Institute of Northwestern Polytechnical University in Shenzhen College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Nanjing University of Aeronautics and Astronautics

In this paper, we investigate the intelligent reflecting surface(IRS) assisted secure transmissions for the untrusted non-orthogonal multiple access(NOMA) network threatened by an external eavesdropper,where the near user and two untrusted far users receive the privacy information from the transmitter assisted by the IRS’s passive reflection. To protect the privacy information against internal and external eavesdropping, we first provide a comprehensive analysis of the secrecy rates, which can offer suitable methods for separately handling the internal and external secrecy performance. Following the above results, we formulate a secrecy rate maximization problem by optimizing the transmission power allocation and phase shifts. To achieve this goal, we decouple the non-convex optimization problem into the external security problem and the internal security problem. Then, we propose a heuristic simulated annealing algorithm to iteratively solve the above problems, where the semi-definite relaxation(SDR) technique, the singular value decomposition(SVD) technique, and the Lagrange multiplier method are utilized to relax the problems and optimize the power allocation and phase shifts. Finally, numerical results show that the proposed scheme can improve the secrecy rate compared with the existing IRS-aided secure NOMA transmission schemes.

关键词： intelligent reflecting surface non-orthogonal multiple access security untrusted users.

The Application of Case Method in the Teaching of Investment Project Evaluation

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Journal of Contemporary Educational Research 2021年第2期5卷 63-67页

作者： yixin he Sichuan University of Science&Engineering ZigongSichuan 643000China

Case Method originated in the 1920s and was initiated by Harvard Business School in the United *** that time,it adopted a unique style of case study,which was based on real situations or events in business management,in this way,it is helpful to cultivate and develop students’active participation in class *** investment students,specialized courses such as Investment Project Evaluation and corporate finance are concentrated in the upper grades,and in the freshman,sophomore phase has completed the Finance,finance,macroeconomics and other basic *** the basis of students’existing knowledge structure,the course“Investment Project Evaluation”needs to fully tap students’potential in learning and train students’practical problem-solving ability,to cultivate students’thinking ability of combining theoretical knowledge with practical cases,to avoid the teaching mode of“I tell you to listen”,and to guide students to think,analyze and solve problems actively.

关键词： Case Method Evaluation of investment projects Teaching mode

Bear bile powder alleviates Parkinson’s disease-like behavior in mice by inhibiting astrocyte-mediated neuroinflammation

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Chinese Journal of Natural Medicines 2023年第9期21卷 710-720页

作者： WANG Lupeng BAI Yuyan TAO Yanlin SheN Wei ZHOU Houyuan he yixin WU Hui HUANG Fei SHI Hailian WU Xiaojun Shanghai Key Laboratory of Compound Chinese Medicines The Ministry of Education(MOE)Key Laboratory for Standardization of Chinese MedicinesThe State Administration of TCM(SATCM)Key Laboratory for New Resources and Quality Evaluation of Chinese MedicineInstitute of Chinese Materia MedicaShanghai University of Traditional Chinese MedicineShanghai 201203China

Parkinson’s disease(PD)is a common neurodegenerative disease in middle-aged and elderly *** particular,increasing evidence has showed that astrocyte-mediated neuroinflammation is involved in the pathogenesis of *** a precious traditional Chinese medicine,bear bile powder(BBP)has a long history of use in clinical *** has numerous activities,such as clearing heat,calming the liver wind and anti-inflammation,and also exhibits good therapeutic effect on convulsive ***,whether BBP can prevent the development of PD has not been ***,this study was designed to explore the effect and mechanism of BBP on suppressing astrocyte-mediated neuroinflammation in a mouse model of ***-like behavior was induced in the mice by intraperitoneal injection of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine(MPTP)(30 mg·kg−1)for five days,followed by BBP(50,100,and 200 mg·kg−1)treatment daily for ten *** stimulated rat C6 astrocytic cells were used as a cell model of *** results indicated that BBP treatment significantly ameliorated dyskinesia,increased the levels of tyrosine hydroxylase(TH)and inhibited astrocyte hyperactivation in the substantia nigra(SN)of PD ***,BBP decreased the protein levels of glial fibrillary acidic protein(GFAP),cyclooxygenase 2(COX2)and inducible nitric oxide synthase(iNOS),and up-regulated the protein levels of takeda G protein-coupled receptor 5(TGR5)in the ***,BBP significantly activated TGR5 in a dose-dependent manner,and decreased the protein levels of GFAP,iNOS and COX2,as well as the mRNA levels of GFAP,iNOS,COX2,interleukin(IL)-1β,IL-6 and tumor necrosis factor-α(TNF-α)in LPS-stimulated C6 ***,BBP suppressed the phosphorylation of protein kinase B(AKT),inhibitor of NF-κB(IκBα)and nuclear factor-κB(NF-κB)proteins in vivo and in *** also observed that TGR5 inhibitor triamterene attenuated the anti-neuroinflammatory effect of BBP on LPS-stimulated C6 ***

关键词： Parkinson's disease Bear bile powder Astrocyte Neuroinflammation Takeda G protein-coupled receptor 5

Analysis on the Psychology and Behavior of Individual Investors under the Influence of COVID-19

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Proceedings of Business and Economic Studies 2020年第5期3卷 116-123页

作者： Jialing Huang yixin he Sichuan University of Science&Engineering Zigong 643000Sichuan ProvinceChina

Due to the relatively short history of the development of the Chinese stock market,the investment philosophy and psychology of most individual investors are not particularly *** under the influence of public health emergencies,the individual investors’characteristic of the investment behavior in the stock market has become more *** paper combines questionnaire and psychological experiments to study the factors that affect investment decisions of individual investors,and then takes COVID-19 as an example to analyze the impact of public emergencies on individual investors’investment decisions in the stock market.

关键词： COVID-19 Overreaction Overconfidence herd effect

Using balance of seasonal herbage supply and demand to inform sustainable grassland management on the Qinghai–Tibetan Plateau

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Frontiers of Agricultural Science and Engineering 2018年第1期5卷 1-8页

作者： Xinquan ZHAO Liang ZHAO Qi LI Huai CheN Huakun ZHOU Shixiao XU Quanmin DONG Gaolin WU yixin he Northwest Institute of Plateau Biology Chinese Academy of Sciences Chengdu Institute of Biology Chinese Academy of Sciences Key Laboratory of Alpine Grassland Ecosystem in the Three River head Waters Region Jointly Funded by Qinghai Province and Ministry of Education Qinghai Academy of Animal and Veterinary Sciences State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation of Chinese Academy of Sciences and Ministry of Water Resources

To mitigate the impacts of grassland degradation on the Qinghai–Tibetan Plateau(QTP), in recent decades China has been implementing large-scale conservation programs and has invested about 42 billion CNY(7 billion USD). However, these programs are faced with major challenges involving trade-offs between ecological function, livestock production and income of *** assessments, as well as technical and policy issues, have not fully captured the complex ecological,social and economic dynamics of the challenges facing grassland management on the QTP. Pastoral livestock production on the QTP is characterized by imbalance in both quality and quantity between livestock seasonal nutrient requirements and herbage production, which forces pastoralists to keep larger numbers of livestock for longer periods, leading to overgrazing. To solve these problems, an integrated crop-livestock system is promoted to improve the efficiency of livestock production and conserve natural grassland as well for a sustainable system for the QTP.

关键词： ecosystem function grassland degradation grassland management integrated rangeland-cropland-livestock production system Qinghai–Tibetan Plateau

Energy scaling and extended tunability of a ring cavity terahertz parametric oscillator based on KTiOPO_(4) crystal

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Chinese Physics B 2018年第11期27卷 512-516页

作者： Yuye Wang Yuchen Ren Degang Xu Longhuang Yang yixin he Ci Song Linyu Chen Changzhao Li Chao Yan Jianquan Yao Institute of Laser and Optoelectronics School of Precision Instruments and Optoelectronic EngineeringTianjin UniversityTianjin 300072China Key Laboratory of Optoelectronic Information Science and Technology(Ministry of Education) Tianjin UniversityTianjin 300072China College of Computer and Information Engineering Tianjin Agricultural UniversityTianjin 300384China

A wide terahertz tuning range from 0.96 THz to 7.01 THz has been demonstrated based on ring-cavity THz wave parametric oscillator with a KTiOPO_(4)(KTP)*** tuning range was observed intermittently from 0.96 THz to 1.87 THz,from 3.04 THz to 3.33 THz,from 4.17 THz to 4.48 THz,from 4.78 THz to 4.97 THz,from 5.125 THz to 5.168 THz,from5.44 THz to 5.97 THz,and from 6.74 THz to 7.01 *** dual-Stokes wavelengths resonance phenomena were observed in some certain tuning angle *** the theoretical analysis of the dispersion curve of the KTP crystal,the intermittent THz wave tuning range and dual-wavelength Stokes waves operation during angle tuning process were *** theoretical analysis was in good agreement with the experiment *** maximum THz output voltage detected by Golay cell was 1.7 V at 5.7 THz under the pump energy of 210 mJ,corresponding to the THz wave output energy of5.47μJ and conversion efficiency of 2.6×10^(-5).

关键词： terahertz parametric oscillator KTiOPO_(4)crystal extended tunability energy scaling

Qinghai-tibetan plateau peatland sustainable utilization under anthropogenic disturbances and climate change

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Ecosystem health and Sustainability 2017年第3期3卷 28-38页

作者： Gang Yang Changhui Peng Huai Chen Faqin Dong Ning Wu Yanzheng Yang Yao Zhang Dan Zhu yixin he Shengwei Shi Xiaoyang Zeng Tingting Xi Qingxiang Meng Qiuan Zhu State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYangling712100 China School of Life Science and Engineering Southwest University of Science and TechnologyMianyang621010 China Department of Biological Sciences Institute of Environmental SciencesUniversity of Quebec at MontrealMontrealQuebec C3H 3P8 Canada CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan ProvinceChengdu Institute of BiologyChinese Academy of SciencesChengdu610041 China Zoige Peatland and Global Change Research Station Chengdu Institute of BiologyChinese Academy of SciencesHong yuan624400 China Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of EducationSouthwest University of Science and TechnologyMianyang621010 China Department of Microbiology and Plant Biology Center for Spatial AnalysisUniversity of OklahomaNormanOklahoma 73019 USA Department of Landscape Architecture Sichuan College of Architectural TechnologyDeyang61800 China College of Economics Heilongjiang Institute of TechnologyHarbinHeilongjiang 150050 China College of Resources and Environmental Science Henan Agricultural UniversityZhengzhouHenan 450002 China

Often referred to as the“Third Pole,”China’s Qinghai-Tibetan Plateau developed large amounts of peatland owing to its unique alpine *** a renewable resource,peat helps to regulate the climate as well as performing other important ***,in recent years,intensifying climate change and anthropogenic disturbances have resulted in peatland degradation and consequently made sustainable development of peatland more *** review summarizes peatland ecological and economic functions,including carbon sequestration,biodiversity conservation,energy supplies,and *** identifies climate change and anthropogenic disturbances as the two key factors attributing to peatland degradation and ecosystem carbon *** problems in environmental degradation and future challenges in peatland management under the effects of global warming are also discussed and highlighted.

关键词： climate change mitigation peatland management renewable resource sustainable development

从“生之谓性”到“君子所性”——性概念的两重含义及孟子论性的旨趣

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中国哲学史 2024年第6期 37-43页

作者：何益鑫复旦大学哲学学院

“生之谓性”是说“生而有的”即是性,这是“言性的原则”。但在人性问题中,以何者为性、如何了解人性,才是各家分歧之所在。故孟子对告子“生之谓性”的诘问,是以归谬的方式揭示形式的规定不能取代内容的讨论。若论性的具体指涉,七十... 详细信息

“生之谓性”是说“生而有的”即是性,这是“言性的原则”。但在人性问题中,以何者为性、如何了解人性,才是各家分歧之所在。故孟子对告子“生之谓性”的诘问,是以归谬的方式揭示形式的规定不能取代内容的讨论。若论性的具体指涉,七十子后学实已形成了“即心言性”的传统,对人性之善的部分、不善的部分同时予以肯定,多持人性有善有恶的主张。孟子一方面继承了“生之谓性”的传统,以“生而有”为言性之原则;一方面又继承了七十子后学“即心言性”的传统,就心的存有与活动以言性。他肯定了人人皆有“四端之心”,此可谓是人的“善性”;进而又将此“善性”认定为人所应当以之为性(所性)的内容,从而实现了从“善性”到“性善”的一跃。孟子对“善心”与“善性”的确认,源于卓越的生存洞见;以“善性”言“性善”,则取决于君子的生存决断。

关键词：孟子性善论生之谓性君子所性

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《周易》所见“伐鬼方”的历史叙事

人文杂志 2019年第4期 73-81页

作者：何益鑫复旦大学哲学学院

近代以来,学者出于对历史的兴趣,对《周易》两次"伐鬼方"的记载多有关注和探讨。但由于不了解《周易》卦爻辞一贯的历史叙事,这些探讨只是抽象地肯认之,而不能对其确切含义作恰切的了解。其实,无论《既济》的"高宗伐鬼方",还是《未济》... 详细信息

近代以来,学者出于对历史的兴趣,对《周易》两次"伐鬼方"的记载多有关注和探讨。但由于不了解《周易》卦爻辞一贯的历史叙事,这些探讨只是抽象地肯认之,而不能对其确切含义作恰切的了解。其实,无论《既济》的"高宗伐鬼方",还是《未济》的"震用伐鬼方",指的都是文王中期,商王帝乙征伐鬼方的事件。在这一事件中,周人以"无成"的方式积极配合商人的军事行动,获得了商王的信任和嘉赏。这是"帝乙归妹"之后,商周关系进一步改善的重要标志。由此,周人获得了一段稳定发展的时期,直到后来文王被囚羑里。

关键词：《既济》《未济》伐鬼方