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A physical layer security scheme for full-duplex communication systems with residual self-interference and non-eavesdropping CSI

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Digital Communications and Networks 2021年第3期7卷 352-361页

作者： Weijia Lei Yang Zhou Xiuzhen Lin School of Communication and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing400065China

We discuss the physical layer security scheme in the Full-Duplex(FD)MIMO point-to-point two-way communication system with residual self-interference,in which legitimate nodes send confidential information and null space Artificial Noise(AN)while receiving information.Because the Channel State Information(CSI)of the eavesdropper is unavailable,we optimize the covariance matrices of the information signal as well as the allocation of the antenna for transmitting and receiving to minimize the signal power consumption under the target rate constraint.As a result,the power of AN is maximized within the limit of total power,so the interception capability of the eavesdropper is suppressed as much as possible.Since self-interference cannot be completely eliminated,the optimization process of one legitimate node depends on the optimization result of the other.By substituting self-interference power in the secrecy rate formula with its average value,the joint optimization process at the two nodes is transformed into two separate and solvable optimization processes.Then,the Water-Filling Algorithm(WFA)and bisection algorithm are used to get the optimal covariance matrices of the signal.Furthermore,we derive the theoretical lower bound of ergodic achievable secrecy rate under rayleigh channels to evaluate the performance of the scheme.The simulation results show that the theoretical derivation is correct,and the actual achievable rate is very close to the target rate,which means that the approximation in the optimization is feasible.The results also show that secrecy transmission can be realized because a considerable secrecy rate can be achieved.

关键词： Physical layer security Full-duplex Self-interference Eavesdropping CSI Multi-antenna

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Energy and Exergy Analysis of a Cooling/Power Cogeneration Ejector Refrigeration System

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Journal of Thermal Science 2022年第2期31卷 448-462页

作者： YANG Mengke LI xiuzhen WANG lin YUAN Junfei WANG Zhanwei LIANG Kunfeng Institute of Refrigeration and Air conditioning Henan University of Science and TechnologyLuoyang 471023China

The organic Rankine cycle is introduced into the conventional ejector refrigeration(CER)system to establish the low-grade heat-driven cooling/power cogeneration ejector refrigeration(CPC-ER)system using the isobutane as the refrigerant.In comparison with the CER system where external power is consumed by the circulating pump,the power output from the CPC-ER system is more than the power consumption of its circulating pump so that a portion of net power is derived from the CPC-ER system.Based on the mathematical model of thermodynamics,energy and exergy analysis of the CPC-ER system is carried out and compared with the CER system.The results reveal that the equivalent coefficient of performance(COP)of the CPC-ER system is 41.14%to 71.30%higher than that of the CER system,and the exergy efficiency of the CPC-ER system is 1.32 to 1.49 times higher than that of the CER system.Both the power produced by the turbine and the total exergy output from the CPC-ER system approach the maximum,as the generating temperature in the generator is up to 80°C.The CPC-ER system has the higher energy utilization efficiency than the CER system,and it is suitable for the cooling and power-required places with low-grade thermal sources.

关键词： ejector refrigeration exergy power consumption equivalent COP

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Origins of black carbon from anthropogenic emissions and open biomass burning transported to Xishuangbanna, Southwest China

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Journal of Environmental Sciences 2023年第3期125卷 277-289页

作者： Xuyan Liu SiwenWang Qianqian Zhang Chunlai Jiang linlin Liang Shihao Tang Xingying Zhang xiuzhen Han lin Zhu National Satellite Meteorological Center Beijing 100081China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084China Department of Multiphase Chemistry Max Planck Institute for ChemistryMainz 55128Germany Research Center for Total Pollution Load Control and Emission Trading Chinese Academy of Environmental PlanningBeijing 100012China State Key Laboratory of Severe Weather and Key Laboratory for Atmospheric Chemistry Chinese Academy of Meteorological SciencesBeijing 100081China

Black carbon(BC) has importance regarding aerosol composition, radiative balance, and human exposure. This study adopted a backward-trajectory approach to quantify the origins of BC from anthropogenic emissions(BCAn) and open biomass burning(BCBB) transported to Xishuangbanna in 2017. Haze months, between haze and clean months, and clean months in Xishuangbanna were defined according to daily PM_(2.5)concentrations of >75, 35–75, andling winds in different seasons.The yearly contributions to the effective emission intensity of BCAnand BCBBtransported to Xishuangbanna were 52% and 48%, respectively. However, when haze occurred in Xishuangbanna, the average BCAnand BCBBcontributions were 23% and 77%, respectively. This suggests that open biomass burning(BB) becomes the dominant source in haze months. Myanmar, India, and Laos were the dominant source regions of BC transported to Xishuangbanna during haze months, accounting for 59%, 18%, and 13% of the total, respectively. Furthermore, India was identified as the most important source regions of BCAntransported to Xishuangbanna in haze months, accounting for 14%. The two countries making the greatest contributions to BCBBtransported to Xishuangbanna were Myanmar and Laos in haze months, accounting for 55% and 13%, respectively. BC emissions from Xishuangbanna had minimal effects on the results of the present study. It is suggested that open BB in Myanmar and Laos, and anthropogenic emissions in India were responsible for poor air quality in Xishuangbanna.

关键词： Black carbon Xishuangbanna Effective emission intensity Anthropogenic emissions Open biomass burning

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Actively separated microneedle patch for sustained-release of growth hormone to treat growth hormone deficiency

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Acta Pharmaceutica Sinica B 2023年第1期13卷 344-358页

作者： Li Yang Qingyun Liu Xinhui Wang Nansha Gao xiuzhen Li Hongzhong Chen lin Mei Xiaowei Zeng Institute of Pharmaceutics School of Pharmaceutical Sciences(Shenzhen)Sun Yat-sen UniversityShenzhen 518107China Department of Genetics and Endocrinology Guangzhou Women and Children's Medical CenterGuangzhou 510623China Tianjin Key Laboratory of Biomedical Materials Key Laboratory of Biomaterials and Nanotechnology for Cancer ImmunotherapyInstitute of Biomedical EngineeringChinese Academy of Medical SciencesPeking Union Medical CollegeTianjin 300192China

Growth hormone deficiency(GHD)has become a serious healthcare burden,and presents a huge impact on the physical and mental health of patients.Here,we developed an actively separated microneedle patch(PAA/NaHCO_(3)^(-)Silk MN)based on silk protein for sustained release of recombinant human growth hormone(rhGH).Silk protein,as a friendly carrier material for proteins,could be constructed in mild full-water conditions and ensure the activity of rhGH.After manually pressing PAA/NaHCO_(3)^(-)Silk MN patch to skin for 1 min,active separation is achieved by absorbing the interstitial fluid(ISF)to trigger HCO_(3)^(-)in the active backing layer to produce carbon dioxide gas(CO_(2)).In rats,the MN patch could maintain the sustained release of rhGH for more than 7 days,and produce similar effects as daily subcutaneous(S.C.)injections of rhGH in promoting height and weight with well tolerated.Moreover,the PAA/NaHCO_(3)^(-)Silk MN patch with the potential of painless self-administration,does not require cold chain transportation and storage possess great economic benefits.Overall,the PAA/NaHCO_(3)^(-)Silk MN patch can significantly improve patient compliance and increase the availability of drugs,meet current unmet clinical needs,improve clinical treatment effects of GHD patients.

关键词： Microneedle Silk protein Self-administration Sustained-release Actively separated Growth hormone deficiency Growth hormone Long-acting GH

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Thermal-Hydraulic Characteristics of Twisted Elliptical Tube Bundle in Staggered Arrangement

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Journal of Thermal Science 2021年第6期30卷 1925-1937页

作者： LI xiuzhen WANG lin FENG Rong WANG Zhanwei ZHU Dongsheng Institute of Building Energy and Thermal Science Henan University of Science and TechnologyLuoyang 471023China CAS Key Laboratory of Renewable Energy Guangzhou 510640China School of Mechanical Engineering Shaanxi Key Laboratory of Industrial AutomationShaanxi University of TechnologyHanzhong 723001China

Based on experimental data,numerical simulations by turbulent air flowing across staggered tube bundle composed of twisted elliptical tube(TET)with constant tube wall temperature are conducted in present study.Parametric study on the thermal-hydraulic characteristics of air crossflow in TET bundles is investigated with physical parameters and Reynolds number(Re).The results show that spiral channels created by spiral deformation of TETs have a diversion effect on the air flow,which changes the flow direction of the air near the tube wall.The air in the near wall region is a three-dimensional flow,consisting of a flow perpendicular to the normal direction of the elliptical cross section and a spiral flow along the helicoid on the downstream side and the upstream side.And the interaction of the spiral channels makes the two flows and their mixing more complicated.The excellent heat transfer performance of staggered TET bundles is confirmed by the comparison of the comprehensive heat transfer performance with that of circular tube bundles.The average Nusselt number(Nu)increases with the increase of the aspect ratio(A/B)and with the increase of Re while decreases as the twist pitch(S)increases.The average Euler number(Eu)increases as A/B increases,while it decreases as Re increases and as S increases.Due to the fact that the suitable correlations for staggered TET bundles are not reported,correlations for Nu and Eu obtained from experimental data and numerical results are presented in the multiple forms.

关键词： twisted elliptical tube heat transfer enhancement pressure drop performance cross flow

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Analysis of the Frequency Domain Water-level Deconvolution Method Based on Reservoir Airgun Source Data

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Earthquake Research in China 2018年第3期32卷 355-366页

作者： You xiuzhen Li Jun lin Binhua Huang Yandan Wu Lihua Guo Yang Fujian Earthquake Agency Fuzhou 350003China

Based on the 2016 airgun experimental data of the Fujian Nanyi reservoir,we adopted the frequency domain water-level deconvolution method and cross-correlation time delay detection technique to study the influence of level scaling factor and the background noise level of the station on deconvolution calculation results, and analyze the effect of deconvolution on eliminating the influence of the source caused by different air-gun pressures. The results show that:( 1) When the level scaling factor is smaller,the signal to noise ratio of the waveform after the deconvolution is smaller,and when the level scaling factor is over smaller,the identification error of travel time is greater.( 2) When the SNR of the station record is higher,the recognition accuracy of travel time is higher,the influence of SNR on the reference station record is far greater than the far station,when the SNR of the far station record is more than 10,the error of travel time is within6 ms,but when the SNR of the reference station record is 30,the travel time error may reach to 20 ms.( 3) When the airgun source difference is big,the frequency domain waterlevel deconvolution method has better effect on eliminating the source influence,but the method error may be introduced when the source difference is small.

关键词： Large volume airgun Water-level deconvolution in frequency domain Cross-correlation time delay Green s function

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心理护理干预对维持性血液透析患者睡眠质量和满意度的影响

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世界睡眠医学杂志 2019年第9期6卷 1246-1248页

作者：林秀贞厦门大学附属第一医院杏林分院

目的:探讨心理护理干预对维持性血液透析患者提高睡眠质量和满意度的影响。方法:选取2017年5月至2019年2月厦门大学附属第一医院杏林分院收治的维持性血液透析患者70例作为研究对象,随机分为对照组和观察组,每组35例。对照组进行常规护... 详细信息

目的:探讨心理护理干预对维持性血液透析患者提高睡眠质量和满意度的影响。方法:选取2017年5月至2019年2月厦门大学附属第一医院杏林分院收治的维持性血液透析患者70例作为研究对象,随机分为对照组和观察组,每组35例。对照组进行常规护理,观察组在常规护理基础上实施心理护理干预,观察2组的睡眠质量和满意度。结果:观察组的各项睡眠质量指标评分均低于对照组,差异有统计学意义(P <0. 05),观察组透析患者满意度(94. 29%)高于对照组(74. 29%),差异有统计学意义(P <0. 05)。结论:心理护理干预可改善维持性血液透析患者的心理压力,从而提高其睡眠质量及对护理的满意度。

关键词：血液透析心理护理满意度睡眠质量

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血清胃功能3项检测对于幽门螺杆菌感染相关胃癌早期诊断价值研究

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标记免疫分析与临床 2023年第12期30卷 2047-2050页

作者：王秀珍林燕厦门大学附属中山医院健康医学部福建厦门361004

目的探讨血清胃功能3项指标检测对于幽门螺杆菌(Hp)感染相关胃癌早期诊断价值。方法选择2021年2月至2023年4月消化内科病房接收的病理确诊胃癌患者80例为胃癌组,同期接收的80例慢性胃炎患者为胃炎组。胃癌组同时根据分期分为早期胃癌组... 详细信息

目的探讨血清胃功能3项指标检测对于幽门螺杆菌(Hp)感染相关胃癌早期诊断价值。方法选择2021年2月至2023年4月消化内科病房接收的病理确诊胃癌患者80例为胃癌组,同期接收的80例慢性胃炎患者为胃炎组。胃癌组同时根据分期分为早期胃癌组与进展期胃癌组。在胃癌组和胃炎组中对PG I、PG II和PG I/PGII 3项指标进行比较,同时对早期胃癌与进展期胃癌检测结果进行比对。经14 C尿素呼气试验判定胃癌组Hp感染阳性情况,对Hp阳性与阴性患者胃功能3项测定结果进行比较。结果胃癌组PG I、PG I/PG II低于胃炎组PG II高于胃炎组(P0.05);14 C尿素呼气试验证实Hp阳性47例(58.75%),胃癌组Hp阳性患者PG I、PG I/PG II低于Hp阴性患者,PG II高于Hp阴性患者(P<0.05)。结论血清PG I、PG II、PG I/PG II联合检测,能够早期识别胃癌,并且评估病情进展情况,这为病变早期干预提供重要帮助。

关键词：幽门螺杆菌感染胃癌胃功能胃蛋白酶原诊断

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2型糖尿病患者采用达格列净片联合盐酸二甲双胍缓释片治疗的临床效果

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糖尿病新世界 2024年第6期27卷 27-30,34页

作者：张秀华林秀贞大田县中医院药剂科福建大田366100

目的探索2型糖尿病行达格列净片+盐酸二甲双胍缓释片治疗的优势。方法选取大田县中医院于2021年1月—2023年12月收治的139例2型糖尿病患者为研究对象,按照随机抽签方式将患者分为两组,对照组69例,给予盐酸二甲双胍缓释片治疗,观察组70例... 详细信息

目的探索2型糖尿病行达格列净片+盐酸二甲双胍缓释片治疗的优势。方法选取大田县中医院于2021年1月—2023年12月收治的139例2型糖尿病患者为研究对象,按照随机抽签方式将患者分为两组,对照组69例,给予盐酸二甲双胍缓释片治疗,观察组70例,开展达格列净片+盐酸二甲双胍缓释片治疗,比较两组临床治疗效果、血糖指标、血脂指标、体质指数、同型半胱氨酸、胰岛功能和不良反应。结果观察组总有效率(97.14%)高于对照组(88.41%),差异有统计学意义(χ^(2)=3.973,P0.05);治疗后观察组血糖、血脂指标、体质指数、同型半胱氨酸低于对照组,差异有统计学意义(P均0.05);治疗后观察组胰岛功能优于对照组,差异有统计学意义(P<0.05)。观察组不良反应发生率低于对照组,差异有统计学意义(P<0.05)。结论达格列净片+盐酸二甲双胍缓释片可以有效改善患者血糖指标,保证血糖稳定,同时改善患者胰岛功能,降低对机体产生的副作用,安全性良好。

关键词：达格列净片 2型糖尿病盐酸二甲双胍缓释片

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新型冠状病毒肺炎3例患者遭受网络暴力的心理干预

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中华精神科杂志 2021年第3期54卷 239-242页

作者：杨林王秀珍孙太鹏淮安市第三人民医院医学心理科 223001

本文中报道的3例新型冠状病毒肺炎患者均为30多岁年轻女性,入院后在遭受个人私生活方面的网络暴力伤害后,出现明显的情绪应激反应,如抑郁状态、急性应激障碍、分离性障碍。我们采用短程、个体化、综合性心理干预,包括支持、鼓励、倾听... 详细信息

本文中报道的3例新型冠状病毒肺炎患者均为30多岁年轻女性,入院后在遭受个人私生活方面的网络暴力伤害后,出现明显的情绪应激反应,如抑郁状态、急性应激障碍、分离性障碍。我们采用短程、个体化、综合性心理干预,包括支持、鼓励、倾听、安全确认、宣泄、心理暗示、激发内在潜能等对患者进行心理干预,其中例3患者在进行心理干预的同时辅以抗精神病药治疗,3例患者经过及时的心理干预取得了良好的治疗效果。

关键词：新型冠状病毒肺炎应激,心理学危机干预网络暴力

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