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A Comparative Analysis of Binary Logistic Regression and Analytical Hierarchy Process for Landslide Susceptibility Assessment in the Dobrovǎt River Basin,Romania

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Pedosphere 2016年第3期26卷 335-350页

作者： Cristian V.PATRICHE radu PIRNAU Adrian GROZAVU Bogdan ROSCA Romanian Academy Department of IasiGeography Group "Alexandru Ioan Cuza" University of Iasi Faculty of Geography

A correct assessment of the landslide susceptibility component is extremely useful for the diminution of associated potential risks to local economic development, particularly in regard to land use planning and soil conservation. The purpose of the present study was to compare the usefulness of two methods, i.e., binary logistic regression(BLR) and analytical hierarchy process(AHP), for the assessment of landslide susceptibility over a 130-km^2 area in the Moldavian Plateau(eastern Romania) region, where landslides affect large areas and render them unsuitable for agriculture. A large scale inventory mapping of all types of landslides(covering 13.7% of the total area) was performed using orthophoto images, topographical maps, and field surveys. A geographic information system database was created, comprising the nine potential factors considered as most relevant for the landsliding process. Five factors(altitude, slope angle, slope aspect, surface lithology, and land use) were further selected for analysis through the application of a tolerance test and the stepwise filtering procedure of BLR. For each predictor, a corresponding raster layer was built and a dense grid of equally spaced points was generated, with an approximately equal number of points inside and outside the landslide area, in order to extract the values of the predictors from raster layers. Approximately half of the total number of points was used for model computation, while the other half was used for validation. Analytical hierarchy process was employed to derive factor weights, with several pair-wise comparison matrices being tested for this purpose. The class weights, on a scale of 0 to 1, were taken as normalized landslide densities. A comparison of results achieved through these two approaches showed that BLR was better suited for mapping landslide susceptibility, with 82.8% of the landslide area falling into the high and very high susceptibility classes. The susceptibility class separation u

关键词： Moldavian Plateau multivariate statistical method predictor weights receiver operating characteristic curve semiqualitative method

Mucinous appendiceal neoplasm:A case report

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World Journal of Clinical Cases 2021年第7期9卷 1728-1733页

作者： Alexandru Chirca Lucian Negreanu Andreea Iliesiu radu Costea Surgery II Department University HospitalCarol Davila UniversityBucharestBucharest 050098Romania Gastroenterology II Department University HospitalCarol Davila UniversityBucharestBucharest 050098Romania Pathology Department University HospitalCarol Davila UniversityBucharestBucharest 050098Romania

BACKGROUND Primary appendiceal tumors are histologically diverse and have an insidious onset and few specific clinical *** the majority of cases,these tumors are discovered after appendectomy during pathological exam of the resected *** may include appendectomy(simple or radical)and right hemicolectomy depending on factors such as histological type,tumor size and lymph node/organ *** aim of this case study is to describe a rare case of a giant appendicular mucocele and raise awareness of this condition and its management options and follow-up *** SUMMARY We present the case of a 43-year-old patient who presented to our emergency department with mild right lower quadrant *** the initial check-up and imaging exams,he underwent surgery,where a giant 20 cm×13 cm appendicular tumor was found and *** mucocele was suspected due to the macroscopic appearance and was later confirmed by the pathological *** patient’s postoperative evolution was uneventful,and after discharge,he was included in our follow-up *** In conclusion,mucinous appendiceal neoplasms embody a rare pathology;they are asymptomatic or have few,unspecific clinical signs and in many cases are discovered after appendectomy.

关键词： Appendiceal tumors Appendicular mucocele Mucinous appendiceal neoplasms Case report

Dynamic and Static Analysis for a Bicycle Model

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Dynamic and Static Analysis for a Bicycle Model

作者： Boca radu Andrei 北京理工大学

学位级别：硕士

Performing Finite Element Analysis（FEA）on bicycle frames has become a common activity for bicycle designers and engineers in the hope of improving the performance of *** is typically achieved by balancing priorities for key requirements,including minimising the mass of the frame（possibly using competition rules to constrain this）,maximising lateral stiffness in the load transfer from the hands and feet to the drive,maximising the strength capabilities of the frame to allow for a higher load capacity or better load distribution,and adjusting the vertical compliance of the frame to tune the softness of the *** chapter 2 FEA has been used to analyse composite,aluminium and steel bicycle frames with the aim of understanding physical behaviour and improving performance relating,however a comprehensive study on the influence of key geometric parameters on the stiffness of frames has not been ***,chapter 3 addresses to development of a fatigue finite element analysis（FEA）,fatigue testing of physical samples in a test fixture,a microstructural fatigue crack growth model to validate the FEA predictions,and ultimately a design iteration leading to an optimal *** FEA model is created utilizing the geometrical characteristics of the *** validate the model,a testing rig is used to evaluate the forks under dynamic *** analytical model and experimental setup are based on the ASTM F2273-03 standard for bending fatigue *** validation,the FEA model is iteratively used to produce an improved fork *** proposed methodology can also be used for materials-process design and optimization for performance in bicycle forks or other structural parts and *** chapter 4,we present the linearized equations of motion for a bicycle as a *** results are obtained by *** bicycle model we consider here consists of four rigid *** rider is rigidly attached to the rear frame with hands free fro

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FSpot:Fast and Efficient Video Encoding Workloads Over Amazon Spot Instances

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Computers, Materials & Continua 2022年第6期71卷 5677-5697页

作者： Anatoliy Zabrovskiy Prateek Agrawal Vladislav Kashansky Roland Kersche Christian Timmerer radu Prodan University of Klagenfurt Klagenfurt9020Austria Lovely Professional University Phagwara144411India Petrozavodsk State University Petrozavodsk185035Russia Bitmovin Klagenfurt9020Austria

HTTP Adaptive Streaming(HAS)of video content is becoming an undivided part of the Internet and accounts for most of today’s network *** compression technology plays a vital role in efficiently utilizing network channels,but encoding videos into multiple representations with selected encoding parameters is a significant ***,video encoding is a computationally intensive and time-consuming operation that requires high-performance resources provided by on-premise infrastructures or public *** turn,the public clouds,such as Amazon elastic compute cloud(EC2),provide hundreds of computing instances optimized for different purposes and clients’***,there is a need for algorithms and methods for optimized computing instance selection for specific tasks such as video encoding and transcoding ***,the encoding speed directly depends on the selected encoding parameters and the complexity characteristics of video *** this paper,we first benchmarked the video encoding performance of Amazon EC2 spot instances using multiple×264 codec encoding parameters and video sequences of varying ***,we proposed a novel fast approach to optimize Amazon EC2 spot instances and minimize video encoding ***,we evaluated how the optimized selection of EC2 spot instances can affect the encoding *** results show that our approach,on average,can reduce the encoding costs by at least 15.8%and up to 47.8%when compared to a random selection of EC2 spot instances.

关键词： EC2 spot instance encoding time prediction adaptive streaming video transcoding clustering HTTP adaptive streaming MPEG-DASH cloud computing optimization Pareto front

Short Ring Cavity Swept Source Based on a Highly Reflective Chirped FBG

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Photonic Sensors 2015年第3期5卷 251-256页

作者： radu-Florin STANCU Adrian PODOLEANU Applied Optics Group School of Physical Sciences University of Kent Canterbury Kent CT2 7NH UK

An optical akinetic swept source （AKSS） at 1060nm, comprising a 5m length fiber ring cavity, a semiconductor optical amplifier （SOA） as gain medium, and a 98% reflective chirped fiber Bragg grating as a dispersive element, is described. Active mode-locking was achieved by directly modulating the current of the SOA with sinusoidal signal of frequency equal to 10 times and 20 times the cavity resonance frequency. In the static regime, linewidths as narrow as 60pm and a tuning bandwidth of 30nm were achieved, while a 2roW output power, without any optical booster, was measured dynamically at a sweep speed of 100kHz. The axial range of the AKSS was evaluated by scanning through the channeled spectrum of a Mach-Zehnder interferometer.

关键词： Semiconductor optical amplifier laser mode locking ring laser dispersive element

“Treat-Repair-Treat”:Management of Left Main Coronary Compression by a Pulmonary Artery Aneurysm in a Patient with Atrial Septal Defect and Significant Pulmonary Hypertension

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Congenital Heart Disease 2023年第1期18卷 67-72页

作者： Andrei George Iosifescu Roxana Enache Ioana Marinică Corina radu Vlad Anton Iliescu Carol Davila University of Medicine and Pharmacy Bucharest020021Romania Department of Cardiac Surgery C.C.Iliescu Emergency Institute for Cardiovascular DiseasesBucharest022322Romania Department of Cardiology C.C.Iliescu Emergency Institute for Cardiovascular DiseasesBucharest022322Romania Department of Cardiovascular Anesthesia and Intensive Care C.C.Iliescu Emergency Institute for Cardiovascular DiseasesBucharest022322Romania

Left main coronary compression syndrome(LMCS)may complicate pulmonary artery aneurysms(PAA),usually developed in the context of pulmonary arterial hypertension(PAH).We report the case of a 51-year-old female patient with an atrial septal defect(unsuitable for device closure)complicated by a PAA generating a 90%left main *** significant PAH held us back from immediate *** specific dual PAH-targeted therapy(sildenafil and bosentan),the atrial septal defect could be closed with a unidirectional valved patch;the PAAinduced LMCS was treated by reductive *** postoperative course was ***-up showed clinical improvement,but PAH treatment was still *** three months,coronary angiography showed only an insignificant residual left main stenosis,proving that reductive pulmonary arterioplasty was effective in treating *** PAA requires further evaluation for LMCS,a dangerous but treatable ***“treat-repair-treat”strategy and shunt-closure with a unidirectional valved patch can both improve surgical prospects of LMCS with shunt-related PAH.

关键词： Atrial septal defect pulmonary arterial hypertension pulmonary artery aneurysm left main coronary compression syndrome surgery unidirectional valved patch

Contrast-enhanced guided endoscopic ultrasound procedures

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World Journal of Gastroenterology 2024年第17期30卷 2311-2320页

作者： Marcel Ioan Gheorghiu Andrada Seicean Cristina Pojoga Claudia Hagiu radu Seicean Zeno Sparchez Department of Gastroenterology “Prof.Dr.Octavian Fodor”Regional Institute of Gastroenterology and Hepatology"Iuliu Hatieganu"University of Medicine and PharmacyCluj-Napoca 400162ClujRomania Department of Clinical Psychology and Psychotherapy International Institute for Advanced Study of Psychotherapy and Applied Mental HealthBabeș-Bolyai UniversityCluj-Napoca 400375ClujRomania The First Surgical Clinic "Iuliu Hatieganu"University of Medicine and PharmacyCluj Napoca 400006ClujRomania

Contrast-enhanced endoscopic ultrasound(CH-EUS)can overcome the limi-tations of endoscopic ultrasound-guided acquisition by identifying microvessels inside inhomogeneous tumours and improving the characterization of these *** the initial enthusiasm that oriented needle sampling under CH-EUS guidance could provide better diagnostic yield in pancreatic solid lesions,further studies did not confirm the supplementary values in cases of tissue acquisition guided by *** review details the knowledge based on the available data on contrast-guided *** indications for CH-EUS tissue acquisition include isoechoic EUS lesions with poor visible delineation where CH-EUS can differentiate the lesion vascularisation from the surrounding parenchyma and also the mural nodules within biliopancreatic cystic lesions,which occur in select ***,the roles of CH-EUS-guided therapy in patients whose pancreatic fluid collections or bile ducts that have an echogenic content have indications for drainage,and patients who have nonvisualized vessels that need to be highlighted via Doppler EUS are *** indication is represented if there is a need for an immediate assessment of the post-radiofrequency ablation of pancreatic neuroendocrine tumours,in which case CH-EUS can be used to reveal the incomplete tumour destruction.

关键词： Endosonography Contrast-enhanced endoscopic ultrasound Tissue acquisition Fine needle aspiration Fine needle biopsy Drainage Pancreatic fluid collections Biopsy Pancreas

Contrast-enhanced ultrasound in portal venous system aneurysms: A multi-center study

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World Journal of Gastroenterology 2014年第48期20卷 18375-18383页

作者： Claudio Tana Christoph F Dietrich radu Badea Liliana Chiorean Vincenzo Carrieri Cosima Schiavone Unit of Internistic Ultrasound Department of Medicine and Science of Aging "G. d’Annunzio" University 66100 Chieti Italy Internal Medicine Unit Guastalla Hospital 42122 AUSL Reggio Emilia Italy Med Klinik 2 Caritas-Krankenhaus D-97980 Bad Mergentheim Germany Department of Ultrasonography "Octavian Fodor" Institute of Gastroenterology and Hepatology "Iuliu Hatieganu" University of Medicine and Pharmacy 400162 Cluj-Napoca Romania Department of Radiology and Computed Tomography "Octavian Fodor" Institute of Gastroenterology and Hepatology 400162 Cluj-Napoca Romania

AIM: To investigate contrast-enhanced ultrasound (CEUS) findings in portal venous system aneurysms (PVSAs).

关键词： Venous system Portal vein Aneurysm Contrast-enhanced ultrasound Computed tomography Magnetic resonance imaging

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基于一种优化算法的大坝变形性态模型

岩土工程学报 2008年第11期30卷 1637-1642页

作者： radu Popa Bogdan Popa Liana Vuta Faculty of Power Engineering University Politehnica of Bucharest Spl. Independentei 313 sect. 6 Romania

大型水库大坝安全监测系统的监测数据可用来建立多种重要的结构安全状态参数下的预测模型。提出了一种基于基因算法的非线性、退化性态模型。以大坝顶部的上、下游位移作为状态参数为例,以倒垂数据作为数据输出,库水位和气温以及前7,15... 详细信息

大型水库大坝安全监测系统的监测数据可用来建立多种重要的结构安全状态参数下的预测模型。提出了一种基于基因算法的非线性、退化性态模型。以大坝顶部的上、下游位移作为状态参数为例,以倒垂数据作为数据输出,库水位和气温以及前7,15,30和60d的平均值作为外在影响因子。选取坝高58m、坝长190m的Herculane拱坝的332个数据集作为输入-输出参数,时间序列为2000年1月—2007年6月。从这个数据序列获得回归系数,并进行检验确认。同理,可得其他参数下性态预测模型。这些模型能够解释实时监测中的数据,并能迅速辨识某些情况下的大坝安全潜在风险。

关键词：大坝位移优化算法