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Biliary leakage after urgent cholecystectomy: Optimization of endoscopic treatment

World Journal of Gastrointestinal Endoscopy 2015年第5期7卷 547-554页

作者： Neven Ljubii Alen Bianin Tajana Pavi marko nikoli Ivan Budimir August Miji Ana Duzel Division of Gastroenterology Department of Internal Medicine "Sestre milosrdnice" University Hospital Division of Hepato-biliary Surgery Department of Surgery "Sestre milosrdnice" University Hospital

AIM: To investigate the results of endoscopic treatment of postoperative biliary leakage occurring after urgent cholecystectomy with a long-term ***: This is an observational database study conducted in a tertiary care center. All consecutive patients who underwent endoscopic retrograde cholangiography(ERC) for presumed postoperative biliary leakage after urgent cholecystectomy in the period between April 2008 and April 2013 were considered for this study. Patients with bile duct transection and biliary strictures were excluded. Biliary leakage was suspected in the case of bile appearance from either percutaneous drainage of abdominal collection or abdominal drain placed at the time of cholecystectomy. Procedural and main clinical characteristics of all consecutive patients with postoperative biliary leakage after urgent cholecystectomy, such as indication for cholecystectomy, etiology and type of leakage, ERC findings and post-ERC complications, were collected from our electronic database. All patients in whom the leakage was successfully treated endoscopically were followed-up after they were discharged from the hospital and the main clinical characteristics, laboratory data and common bile duct diameter were electronically recorded. RESULTS: During a five-year period, biliary leakage was recognized in 2.2% of patients who underwent urgent cholecystectomy. The median time from cholecystectomy to ERC was 6 d(interquartile range, 4-11 d). Endoscopic interventions to manage biliary leakage included biliary stent insertion with or without biliary sphincterotomy. In 23(77%) patients after first endoscopic treatment bile flow through existing surgical drain ceased within 11 d following biliary therapeutic endoscopy(median, 4 d; interquartile range, 2-8 d). In those patients repeat ERC was not performed andthe biliary stent was removed on gastroscopy. In seven(23%) patients repeat ERC was done within one to fourth week after their first ERC, depending on th

关键词： Urgent cholecystectomy Acute cholecystitischolecystectomy complications Biliary leakage Endoscopic retrograde cholangiography Endoscopictreatment

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Abstract Differential Operators Generating Fractional Resolvent Families

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Acta Mathematica Sinica,English Series 2014年第11期30卷 1989-1998页

作者： marko KOSTI Faculty of Technical Sciences 21125 Novi SadSerbia

In the paper under review,we consider the generation of fractional resolvent families by abstract differential *** results can be simply incorporated in the study of corresponding abstract time-fractional equations wi... 详细信息

关键词： Abstract time-fractional equations fractional resolvent families coercive differential operators

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Optimal orthogonalization processes

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Science China Mathematics 2022年第1期65卷 203-220页

作者： marko Huhtanen Pauliina Uusitalo Department of Electrical and Information Engineering University of OuluOulu 90570Finland

Two optimal orthogonalization processes are devised toorthogonalize,possibly approximately,the columns of a very large and possiblysparse matrix A∈C^(n×k).Algorithmically the aim is,at each step,to optimallydecrease nonorthogonality of all the columns of *** process relies on using translated small rank *** is a polynomial orthogonalization process forperforming the Löwdin *** steps rely on using iterative methods combined,preferably,with preconditioning which can have a dramatic effect on how fast thenonorthogonality *** speed of orthogonalization depends on howbunched the singular values of A are,modulo the number of steps *** methods put the steps of the Gram-Schmidt orthogonalizationprocess into perspective regardingtheir(lack of)*** constructions are entirely operatortheoretic and can be extended to infinite dimensional Hilbert spaces.

关键词： optimal orthogonalization sparse matrix Gram-Schmidt orthogonalization Lowdin orthogonalization polynomial orthogonalization implicit orthogonalization preconditioning Gram matrix frame inequality

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On tempered and square integrable representations of classical p-adic groups

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Science China Mathematics 2013年第11期56卷 2273-2313页

作者： TADI marko Department of Mathematics University of Zagreb

This paper has two aims. The first is to give a description of irreducible tempered representations of classical p-adic groups which follows naturMly the classification of irreducible square integrable representations modulo cuspidal data obtained by Mceglin and the author of this article （2002）. The second aim of the paper is to give a description of an invariant （partially defined function） of irreducible square integrable representation of a classical p-adic group （defined by Mceglin using embeddings） in terms of subquotients of Jacquet modules. As an application, we describe behavior of partially defined function in one construction of square integrable representations of a bigger group from such representations of a smaller group （which is related to deformation of Jordan blocks of representations）.

关键词： non-archimedean local fields classical groups square integrable representations tempered repre-sentations

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Abstract Volterra equations in locally convex spaces

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Science China Mathematics 2012年第9期55卷 1797-1825页

作者： KOSTIC marko Faculty of Technical Sciences University of Novi SadNovi Sad 21125Serbia

A general class of(a,k)-regularized C-resolvent families is one of efficient research tools for dealing with non-degenerate abstract Volterra equations of scalar *** main purpose of this expository paper is to provide... 详细信息

关键词： abstract Volterra equation locally convex space (a k)-regularized C-resolvent family well-posedness

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Base lubricants for green stamping:The effects of their structure and viscosity on tribological performance

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Friction 2023年第9期11卷 1741-1754页

作者： marko POLAJNAR LucijaČOGA Mitjan KALIN Laboratory for Tribology and Interface Nanotechnology Faculty of Mechanical EngineeringUniversity of LjubljanaLjubljana 1000Slovenia

The requirements for green and sustainable manufacturing mean that stamping lubricants must be continuously re-evaluated and *** this investigation,the tribological performance of four base oils with different chemical structures(paraffinic and naphthenic)and viscosities(2 and 20 cSt),as well as water,was evaluated for the stamping of steel sheets and compared with a non-lubricated *** lubricants reduce the coefficient of friction and maintain a similar wear coefficient for steel sheets as in dry ***-viscosity(LV)naphthenic oil performs very like both high-viscosity(HV)oils.A surprising exception is the LV paraffinic oil,with several-times-higher friction and wear compared to dry *** is due to the excellent wetting-spreading and very low cohesion forces that enable oil to escape from extremely thin-film contacts because the viscosity is so low,leading to lubricant *** contrast,HV oils provide a sufficiently thick lubricating film,while strong cohesive forces help in the film’s strength,lessening wear,and reducing *** thin-film lubrication with LV oils,such as when stamping,it is thus extremely important that the lubricant’s wetting behaviour and viscosity are sufficient to provide enough film in the contact and prevent starvation,thus ensuring lower friction,less wear,and a longer lifetime of the contact.

关键词： stamping viscosity water paraffinic oil naphthenic oil wetting

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Artificial intelligence-based predictive model of nanoscale friction using experimental data

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Friction 2021年第6期9卷 1726-1748页

作者： marko PERČIĆ Saša ZELENIKA Igor MEZIĆ University of Rijeka Faculty of Engineering51000 RijekaCroatia University of Rijeka Centre for Micro-and Nanosciences and Technologies&Center for Artificial Intelligence and Cybersecurity51000 RijekaCroatia University of California Santa Barbara Department of Mechanical EngineeringSanta BarbaraCA 93105USA

A recent systematic experimental characterisation of technological thin films,based on elaborated design of experiments as well as probe calibration and correction procedures,allowed for the first time the determination of nanoscale friction under the concurrent influence of several process parameters,comprising normal forces,sliding velocities,and temperature,thus providing an indication of the intricate correlations induced by their interactions and mutual *** created the preconditions to undertake in this work an effort to model friction in the nanometric domain with the goal of overcoming the limitations of currently available models in ascertaining the effects of the physicochemical processes and phenomena involved in nanoscale *** to the stochastic nature of nanoscale friction and the relatively sparse available experimental data,meta-modelling tools fail,however,at predicting the factual *** on the acquired experimental data,data mining,incorporating various state-of-the-art machine learning(ML)numerical regression algorithms,is therefore *** results of the numerical analyses are assessed on an unseen test dataset via a comparative statistical *** is therefore shown that the black box ML methods provide effective predictions of the studied correlations with rather good accuracy levels,but the intrinsic nature of such algorithms prevents their usage in most practical *** programming-based artificial intelligence(AI)methods are consequently finally *** the marked complexity of the analysed phenomena and the inherent dispersion of the measurements,the developed AI-based symbolic regression models allow attaining an excellent predictive performance with the respective prediction accuracy,depending on the sample type,between 72%and 91%,allowing also to attain an extremely simple functional description of the multidimensional dependence of nanoscale friction on the studied variable process param

关键词： nanoscale friction thin films data mining machine learning(ML) predictive artificial intelligence(AI)-based model

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On Abstract Third-Order Differential Equation and Its Applications

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Acta Mathematica Sinica,English Series 2023年第3期39卷 399-411页

作者： Belkacem CHAOUCHI Lakhdar BENAISSA marko KOSTIC Department of Mathematics Faculty of Science and TechnologyUniversity of Khemis MilianaKhemis MilianaAlgeria Department of Mathematics Faculty of ScienceUniversity of AlgiersAlgeria Faculty of Technical Sciences University of Novi SadTrg D.Obradovica 621125 Novi SadSerbia

In this paper,we consider an abstract third-order differential equation and deduce some results on the maximal regularity of its strict *** assume that the inhomogeneity appearing in the right-hand term of this equation belongs to some anistropic Holder *** illustrate our results by a BVP involving a 3D Laplacian posed in a cusp domain of R^(4).

关键词： Abstract third-order differential equation cusp domain strict solution

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Design,Implementation and Performance of Synchronous Current Regulators for AC Drives

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Chinese Journal of Electrical Engineering 2018年第3期4卷 53-65页

作者： Fernando Briz marko Hinkkanen University of Oviedo GijonSpain Aalto University EspooFinland

Accurate,high bandwidth current control is a requirement for high performance vector controlled AC *** PI current regulators are the preferred solution for this *** and operation principles of synchronous PI current regulators are well ***,there are a number of issues that must be considered,especially when the drive must operate at high synchronous frequencies,including regulator design,effects due to discretization and the associated delays,voltage constraints and current sampling issues among *** degradation of the current regulator performance and consequently of the drive can occur otherwise.

关键词： Synchronous current regulators AC drives discretization discrete time models state feedback voltage saturation complex vector models

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Amplitude Factorization Method in the Atmospheric Gravity-Wave Equation

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Communications in Computational Physics 2007年第5期2卷 993-1006页

作者： Rein Room marko Zirk Institute of Environmental Physics Tartu UniversityUlikooli 18Tartu 50090Estonia.

A novel amplitude factorization method is applied to solve a discrete buoyancy wave equation with arbitrary wind and temperature height *** solution is given in the form of a cumulative product of complex factors,which are computed by a nonlinear,inhomogeneous,two-member recurrence formula,initiated from a radiative condition on *** of the wave equation due to evanescent winds are eliminated by turbulent *** method provides an estimation of the minimal vertical resolution,required to attain a stable accurate *** areas of application of the developed numerical scheme are high resolution modelling of orographic waves for arbitrary orography in general atmospheric stratification conditions,and testing of adiabatic kernels of numerical weather prediction models.

关键词： Atmospheric gravity waves linear buoyancy wave equation arbitrary stratification numerical solution amplitude factorization method.

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