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基于区块链的双重可验证云存储方案

通信学报 2021年第12期42卷 192-201页

作者：冯涛孔繁琪柳春岩马蓉 maher Albettar 兰州理工大学计算机与通信学院甘肃兰州730050 兰州理工大学经济与管理学院甘肃兰州730050 康考迪亚大学康考迪亚信息系统工程研究所蒙特利尔H3G 1M8

针对工业物联网(IIoT)中,工业设备将数据存储到云端,导致数据易被篡改且无法追踪恶意用户,引起恶性循环的问题,借助区块链的可溯源性和不可篡改性等特点,提出了一种基于区块链的双重可验证云存储方案。首先,使用同态加密技术加密数据并... 详细信息

针对工业物联网(IIoT)中,工业设备将数据存储到云端,导致数据易被篡改且无法追踪恶意用户,引起恶性循环的问题,借助区块链的可溯源性和不可篡改性等特点,提出了一种基于区块链的双重可验证云存储方案。首先,使用同态加密技术加密数据并上传至云端,确保传输安全性,实现数据的隐私保护;其次,将聚合密文和上传者信息存储在区块链上,有效避免数据被非法用户篡改的风险,并能对恶意用户进行追溯,实现对云端数据完整性的双重验证;最后,进行安全性分析,证明所提方案比同类方案更加安全可靠。

关键词：区块链可验证计算隐私保护云存储

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An Accurate Dynamic Forecast of Photovoltaic Energy Generation

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Fluid Dynamics & materials Processing 2022年第6期18卷 1683-1698页

作者： Anoir Souissi Imen Guidara maher Chaabene Giuseppe marco Tina Moez Bouchouicha Signal Image et Maîtrise de l’Energie(SIME Laboratory)Tunis1008Tunisia Dipartimento di Ingegneria Elettrica Elettronica e InformaticaCatania95125Italy Laboratoire LIS-Equipe SIIM Département GMP IUT Toulon83041France

The accurate forecast of the photovoltaic generation(PVG)process is essential to develop optimum installation sizing and pragmatic energy planning and *** paper proposes a PVG forecast model for a PVG/Battery *** forecasting strategy is built on a Medium-Term Energy Forecasting(MTEF)approach refined dynamically every hour(Dynamic Medium-Term Energy Forecasting(DMTEF))and adjusted by means of a Short-Term Energy Forecasting(STEF)*** MTEF predicts the generated energy for a day ahead based on the PVG of the last 15 *** for STEF,it is a combination between PVG Short-Term(ST)forecasting and DMTEF methods obtained by selecting the least inaccurate PVG estimation every 15 *** algorithm results are validated by measures taken on a 3 KWp standalone PVG/Battery *** proposed approaches have been integrated into a management algorithm in order to make a pragmatic decision to ensure load supply considering relevant constraints and priorities and guarantee the battery *** results show that STEF provides accurate results compared to measures in stable and perturbed *** NMBE(Normalized Mean Bias Error)is equal to-0.58%in stable days and 26.10%in perturbed days.

关键词： Energy Forecasting MTEF DMTEF STEF ARIma model photovoltaic energy

Is fluoroscopy-free single-use flexible ureteroscopy a feasible treatment for kidney stones with abnormal renal anatomy?

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Asian Journal of Urology 2024年第4期11卷 591-595页

作者： Hamdy Aboutaleb Mohamed Sultan Ahmed Zaghloul Yasser Farahat maher Gawish Fouad Zanaty Urology Department Menoufia University HospitalEgypt Urology Department Burjeel HospitalAbu DhabiUnited Arab Emirates Urology Department AlAzhar UniversityAssiut BranchEgypt

ObjectiveThis study aimed to evaluate the feasibility of the fluoroscopy-free single-use flexible ureteroscopy procedure in the treatment of kidney stones with abnormal renal anatomy compared to normal renal *** patients with abnormal (Group A) and 80 patients with normal (Group B) renal anatomy who had 10–20 mm renal stones were included. They were treated with LithoVue single-use flexible ureteroscopy (Boston Scientific, marlborough, ma, USA) after ureteric dilatation by two different size semi-rigid ureteroscopes. This technique was chosen as the aim was to exclude any ureteric pathology (e.g., stone or stricture), confirm the placement of a safe guidewire, avoid balloon dilatation of the ureter, and achieve safe insertion of a 12 Fr, 35/45 cm ureteric access sheath with optical and tactile sign and without fluoroscopy image for *** mean ages were 43 years and 45 years in Group A and Group B, respectively. The mean stone burden was 14.62 (standard deviation: 5.35) mm^(3) and 14.79 (standard deviation: 4.58) mm^(3) in Group A and Group B, respectively. There is no significant difference between both groups according to the mean operative time, hospital stay, or stone-free rate. The stone-free rate was about 93% in both groups when the stone size was between 10 mm and 15 mm, and less than 54% when the stone size was more than 15 mm to 20 mm. In the majority of cases (80.0% in Group A and 92.5% in Group B), we completed the procedure without fluoroscopy. The perioperative complication rates were comparable in the two ***-free single-use flexible ureteroscopy, when performed by expert urologists, is a feasible treatment for pre-stented patients with kidney calculi of ≤15 mm with abnormal renal anatomy.

关键词： Fluoroscopy Flexible ureteroscopy Renal stone Abnormal renal anatomy

The Effect of Dexamethasone versus Methylprednisolone in the Treatment of COVID-19 Patients in Jordan

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Advances in Infectious Diseases 2023年第3期13卷 508-520页

作者： Jamal Wadi Al Ramahi Nour Hasan Amal matar ma’en maher Al-Ali Lara Abdulhadi dania Abu Kaf Waseem Saadeh Nour Hamdan Hassan Abu Khalaf Mohamed Gharaibeh Hanadi Hamadallah Ala’a Bader Mohammad Atout Sae’ed Moh. mar’I Tamer Alhamed Department of Medicine School of Medicine The University of Jordan Amman Jordan Clinical Pharmacy Al Khalidi Hospital Amman Jordan Department of General Medicine Al Khalidi Hospital Amman Jordan Department of Clinical Medical Sciences Faculty of Medicine Yarmouk University Irbid Jordan Department of Medicine The Specialty Hospital Amman Jordan Department of Anesthesia The Specialty Hospital Amman Jordan Department of Pharmacy Jordan Hospital Amman Jordan Department of Pharmacy The Specialty Hospital Amman Jordan

Background: Previous studies focused on the treatment effect of steroids versus no steroids in treating severe COVID-19 patients, a few studies evaluated outcomes for treating those patients with either dexamethasone or methylprednisolone. Currently, we evaluate the difference in mortality associated with treating COVID-19 patients with dexamethasone versus methylprednisolone. Methods: With a retrospective multicenter study, records were reviewed for the admitted patients with severe COVID-19 during the peak of the severe COVID-19 pandemic. All admitted patients on dexamethasone or methylprednisolone were included. Patients were analyzed as all populations and propensity scores matched patients. Propensity scores were calculated for several confounders by the generalized linear model, and a “greedy” near-neighbor matching algorithm was used. Continuous variables with nonnormal distribution were analyzed by Wilcoxon signed rank test. Chi-squared and Fischer exact test analyzed categorical variables. P-values were adjusted by the Bonferroni method for both data cohorts. Body mass index was in categories. Radiological findings were divided into five categories. The outcomes: mortality, the need for home oxygen therapy, recovery, and residual symptoms on discharge were analyzed by an independent two-sample test for equality of proportions (with Yates correction), and logistic regression analysis. Results: Among the 1128 reviewed records, patients on dexamethasone or methylprednisolone were 1071, and the propensity score-matched patients were 784: dexamethasone 393 and methylprednisolone 391. There was no significant difference in the characteristics of patients between the two steroids (p-value and adjusted p-value > 0.05) for most variables. PSM adjusted a few discrepant variables before analysis. The outcome of the unmatched patients demonstrated dexamethasone benefit in the need for home oxygen therapy ( 0.05). However, matched patients demonstrated significantly low

关键词： Dexamethasone Methylprednisolone COVID-19 Mortality Home Oxygen COVID-19 Recovery

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前缘可变弯度翼型的跨声速数值模拟

兵器装备工程学报 2018年第4期39卷 1-5页

作者：马贵春林义彪王冠宇赵垒中北大学机电工程学院太原030051

以超临界翼型DFVLR R-4翼型为基本翼型,在前缘30%弦长处,对翼型进行正向(向下)偏转1°、2°和负向(向上)偏转1°、2°,得到4种变弯度翼型并进行跨声速下气动力数值分析。结果表明:在跨声速中,翼型正向偏转阻力发散特性得到改善,负向偏... 详细信息

以超临界翼型DFVLR R-4翼型为基本翼型,在前缘30%弦长处,对翼型进行正向(向下)偏转1°、2°和负向(向上)偏转1°、2°,得到4种变弯度翼型并进行跨声速下气动力数值分析。结果表明:在跨声速中,翼型正向偏转阻力发散特性得到改善,负向偏转阻力发散特性变差;在相同来流马赫数下,翼型正偏转升力系数减小,负向偏转,升力系数增大;翼型正向偏转时,失速迎角特性得到改善。综合分析得出,跨声速能够较好地运用前缘可变弯度翼型。

关键词：超临界翼型前缘可变弯度跨声速阻力发散特性升阻比失速迎角

TSP-1活化TGF-β_1在糖尿病肾病瘀血阻络证大鼠的表达及化瘀通络中药的干预作用

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时珍国医国药 2016年第12期27卷 3047-3049页

作者：白璐陈志强霍贝贝徐晶马二卫郭倩霍燕伟河北医科大学河北石家庄050017 河北省中医院河北石家庄050011 河北中医学院河北石家庄050200

目的探讨TSP-1活化TGF-β_1在糖尿病肾病瘀血阻络证大鼠的表达及化瘀通络中药的干预作用。方法 50只雄性SD大鼠,随机选取10只为正常对照组(C组),余40只采用高糖高脂饲料饲养联合小剂量STZ腹腔注射造模。成模大鼠随机分为模型组(M组)、... 详细信息

目的探讨TSP-1活化TGF-β_1在糖尿病肾病瘀血阻络证大鼠的表达及化瘀通络中药的干预作用。方法 50只雄性SD大鼠,随机选取10只为正常对照组(C组),余40只采用高糖高脂饲料饲养联合小剂量STZ腹腔注射造模。成模大鼠随机分为模型组(M组)、中药组(Z组)、厄贝沙坦组(I组),相应药物剂量灌胃。16周末测空腹血糖(FBG)、糖化血红蛋白(HbA1c)、留取尿液测24h尿微量白蛋白(U-malb)、计算右肾重/体重(KI)、PCR及western-blotting检测肾皮质TSP-1、TGF-β_1表达。结果与C组比较,M组FBG、HbA1c、KI、U-malb、TSP-1、TGF-β_1 mRNA及蛋白表达水平均明显升高(Pmalb、TSP-1、TGF-β_1mRNA及蛋白表达水平明显下降(P<0.05)。结论 TSP-1、TGF-β_1可能作为靶点之一参与了化瘀通络中药对糖尿病肾病大鼠的肾保护作用。

关键词：血小板反应蛋白1 转化生长因子β1 化瘀通络中药糖尿病肾病

汽轮机末级静叶栅内非平衡态凝结流动的数值研究

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汽轮机技术 2019年第1期61卷 41-42,70页

作者：张宇李兴华刘云锋王健梁天赋赵洪羽马天吟哈尔滨汽轮机厂有限责任公司哈尔滨150046

对非平衡态凝结的末级静叶栅流场进行了数值研究。在三维CFD计算中加入双流体模型,并将其流场与平衡态的凝结流场进行了对比。对比内容包括叶片表面压力分布、马赫数分布以及成核率、湿度等参数。对比结果表明:双流体模型能够更为准确... 详细信息

对非平衡态凝结的末级静叶栅流场进行了数值研究。在三维CFD计算中加入双流体模型,并将其流场与平衡态的凝结流场进行了对比。对比内容包括叶片表面压力分布、马赫数分布以及成核率、湿度等参数。对比结果表明:双流体模型能够更为准确地描述叶栅内存在的非平衡态凝结流动,成核率和凝结区面积沿叶高方向逐渐减小。

关键词：汽轮机非平衡态凝结 CFD 数值模拟