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Extended knowledge attributed Petri Nets

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International Journal of Modeling, Simulation, and Scientific Computing 2014年第2期5卷 92-111页

作者： attila Fur Budapest University of Technology and Economics McLeod Institute of Simulation Sciences Hungarian Center H-1117 Budapest Magyar tud´osok korutja 2.Q.Building A-233Hungary

Choosing the best way for describing physical reality has always been standing in focus of *** methodologies have been developed based on classical mathematics,or statistics and also new disciplines-such as soft-computing *** Nets as one of the most naturalistic modeling methodologies are well suited to describe complex process in *** in some fields of modeling the describing power of basic Petri Nets proved not to be robust enough,therefore several exten-sions were made to the original *** tokens(Colored Petri Nets),stochastic delayed streaming of mobile entities(Stochastic Petri Nets),object oriented architecture(Object Oriented Petri Nets),numerical(Numerical Petri Nets)and linguistic attributes(Fuzzy Petri Nets)broaden the range of *** some fields of problem solv-ing,usage of static and mobile knowledge bases is needed:e.g.,flexible manufacturing systems,or intelligent traffic *** problems to be investigated involved new conceptual developments of Petri Nets and led to the introduction of Knowledge Attributed Petri *** the same time distributed control in simulation appeared,intelligent agents supported the connection of mobile knowledge bases and static infer-ence engines in an effective *** mentioned extensions brought general support in model synthesis,but some unsolved questions remained related to the implementation of intelligent mobile *** paper highlights a new level of AI controlled simulation introducing the Extended Knowledge Attributed Petri Nets that offer the capability of easy implementation of mobile inference engines and knowledge base,providing general mobile AI in Petri Nets.

关键词： Know ledge attributed petri nets modeling of group behavior mobile agents

LIQUID-LIQUID PHASE EQUILIBRIUM OF POLYMER SOLUTIONS AND POLYMER BLENDS UNDER POSITIVE AND NEGATIVE PRESSURE

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Chinese Journal of Polymer Science 2003年第2期21卷 241-250页

作者： attila R.Imre KFKI Atomic Energy Research Institute H-1525 Budapest POB 49 Hungary

In this paper we would like to give a brief review about the extensibility of the liquid-liquid locus into the negativepressure region. Negative pressure states are hardly explored; most researchers believe that the pressure scale ends at p = *** would like to show that this is not true, the p = 0 point is not a special point for liquids, it can be 'easily' crossed. We aregoing to give a few example, where the extension of liquid-liquid locus for polymer blends and solutions below p = 0 givesus some interesting results, like the merging of UCST and LCST branches in weakly interacting polymer solutions or thereason why most UCST blends exhibit pressure induced immiscibility. Also, we will see what happens with the immiscibilityisland of aqueous polymer solutions when -- reaching the critical molar mass -- it 'disappears'.

关键词： Pressure Negative pressure Polymer Solubility Phase transition

Partial pre-image attack on Proof-of-Work based blockchains

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Blockchain(Research and Applications) 2024年第3期5卷 1-10页

作者： Hamza Baniata attila Kertesz Department of Software Engineering University of SzegedH-6720 SzegedHungary

Blockchain is a type of distributed ledger technology that consists of a growing list of records,called blocks,that are securely linked together using *** blockchain-based solution deploys a specific consensus algorithm that guarantees the consistency of the ledger over *** most famous,and yet claimed to be the most secure,is the Proof-of-Work(PoW)consensus *** this paper,we revisit the fundamental calculations and assumptions of this algorithm,originally presented in the Bitcoin white *** break down its claimed calculations in order to better understand the underlying assumptions of the *** also propose a novel formalization model of the PoW mining problem using the Birthday *** utilize this model to formalize and analyze partial pre-image attacks on PoW-based blockchains,with formal analysis that confirms the experimental results and the previously proposed *** build on those analyses and propose new concepts for benchmarking the security of PoW-based systems,including Critical Difficulty and Critical Difficulty per given *** calculations result in several important findings,including the profitability of launching partial pre-image attacks on PoW-based blockchains,once the mining puzzle difficulty reaches a given ***,for any compromised portion of the network(q<0.5;honest majority assumption still holds),the attack is formally proven profitable once the PoW mining puzzle difficulty reaches 56 leading zeros.

关键词： Blockchain Proof-of-Work Security Partial pre-image attack Hash functions

Fabrication and in vivo 2-photon microscopy validation of transparent PEDOT:PSS microelectrode arrays

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Microsystems & Nanoengineering 2022年第4期8卷 183-190页

作者： Gerwin Dijk attila Kaszas Jolien Pas Rodney Philip O’Connor Mines Saint-Etienne Centre CMPDepartment of BioelectronicsGardanne 13541France Panaxium SAS Aix-en-Provence 13100France

Transparent microelectrode arrays enable simultaneous electrical recording and optical imaging of neuronal networks in the *** made of the conducting polymer poly(3,4-ethylenedioxythiophene)doped with polystyrene sulfonate(PEDOT:PSS)are transparent;however,device fabrication necessitates specific processes to avoid deterioration of the organic ***,we present an innovative fabrication scheme for a neural probe that consists of transparent PEDOT:PSS electrodes and demonstrate its compatibility with 2-photon *** electrodes show suitable impedance to record local field potentials from the cortex of mice and sufficient transparency to visualize GCaMP6f-expressing neurons underneath the PEDOT:PSS *** results validate the performance of the neural probe,which paves the way to study the complex dynamics of in vivo neuronal activity with both a high spatial and temporal resolution to better understand the brain.

关键词： material. transparent microelectrode

Enteral nutrition in acute pancreatitis:A review of the current evidence

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World Journal of Gastroenterology 2014年第43期20卷 16123-16131页

作者： attila Oláh Laszlo Romics Jr Department of Surgery Petz Aladár Teaching HospitalH-9023 Gy?rHungary Department of Surgery Glasgow Victoria InfirmaryGlasgow G42 9TYUnited Kingdom

The use of enteral feeding as part of the management of acute pancreatitis dates back almost two *** review describes the indications for and limitations of enteral feeding for the treatment of acute pancreatitis using up-to-date evidence-based data.A systematic review was carried out to analyse current data on the use of enteral nutrition in the management of acute *** literature was analysed from the viewpoints of enteral vs parenteral feeding,early vs delayed enteral nutrition,nasogastric vs nasojejunal feeding,and early oral diet and immunonutrition,particularly glutamine and probiotic ***,current applicable guidelines and the effects of these guidelines on clinical practice are *** latest meta-analyses suggest that enteral nutrition significantly reduces the mortality rate of severe acute pancreatitis compared to parenteral *** maintain gut barrier function and prevent early bacterial translocation,enteral feeding should be commenced within the first 24 h of hospital ***,the safety of nasogastric feeding,which eases the administration of enteral nutrients in the clinical setting,is likely equal to nasojejunal ***,an earlylow-fat oral diet is potentially beneficial in patients with mild *** the initial encouraging results,the current evidence does not support the use of immunoenhanced nutrients or probiotics in patients with acute pancreatitis.

关键词： Acute pancreatitis Enteral nutrition Immunonutrition Probiotics

Comparison of wheat-based rotation systems and monocropping systems under dryland Mediterranean conditions

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International Journal of Agricultural and Biological Engineering 2017年第5期10卷 203-213页

作者： Servet Tekin attila Yazar Hatun Barut Department of Biosystems Engineering Faculty of AgricultureKahramanmaras Sütcüİmam UniversityKahramanmaras 46100Turkey Irrigation and Agricultural Structures Department Çukurova UniversityAdana 01330 Turkey Eastern Mediterranean Agricultural Research Institute Adana 01370Turkey

Mono-cropping systems consisting of general low-yielding cereals are crucial productivity constraints in dry areas of the Mediterranean region.A crop rotation consisting of quinoa(Chenopodium quinoa Willd.)-wheat(Triticum aestivum L)-chickpea(Cicer arietinum)was compared with monocropping in the Mediterranean region of Turkey.A four year crop rotation trial was set up in Adana,Turkey.A total of nine crop rotation systems of Quinoa(Q),chickpea(L)and wheat(W)were considered in this *** four year results revealed that there was significant difference in grain and biomass yields,but no significant difference in plant height,harvest index,and 1000 grain weight of wheat among the treatments in crop rotation except number of grains per spike and soil organic *** wheat and chickpea-wheat-chickpea-wheat(LWLW)produced significantly greater grain yield in 2010/2011 and 2011/*** and QWQW rotation produced significantly lower biomass yield in 2008/*** maximum biomass yield of LWLW rotation resulted in 2011/2012 growing ***,the effect of previous crop on wheat grain and biomass yield in the four years of the rotation study was significantly *** the long run,the favorable effects of legume-based rotations on crop yields and water productivity are apparent.

关键词： crop rotation system monocropping system quinoa Chenopodium quinoa chickpea dryland yield

Density and thermal expansion coefficients of liquid and austenite phase in lamellar cast iron

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China Foundry 2020年第2期17卷 127-136页

作者： Kristina Hellstrm Vasile-Lucian Diaconu attila Diószegi School of Engineering J.nk.ping UniversitySweden

Volume change related defects formation mechanisms are an important detracting phenomenon in production of complex shaped cast *** different technical alloys,cast iron behaves in a complex manner due to the combined volume change of the formed *** liquid and the austenitic phase are contracting while the graphite phase is expanding during the *** complex volume change in combination with complex casting shapes causes a considerable deviation from isotropy in the solidification *** mentioned difficulties are considered the main reason why an extensive research work is condensed in the literature within this *** multitude of reported experimental set up and the various efforts to interpret the volume change phenomena in terms of density and thermal expansion coefficients makes the results difficult to compare from different *** these difficulties in mind,the present paper presents a broad experimental series and measures unidirectional linear deformation of an industrially spread lamellar cast iron alloy system(Fe-C-2Si)using the push-rod based dilatometer *** measurements are divided into two major groups with respect to the liquid iron deformation over the liquidus temperature line,and the austenite deformation below the solidus temperature *** obtained results are interpreted as thermal expansion coefficients,density variation slopes,and density data at the liquids and solidus *** obtained results are compared with literature data and with calculated values by the Thermo Calc software.

关键词： density thermal expansion coefficient dilatometer castiron Fe-C-2Si CALPHAD

Rapid switching and durable on-chip spark-cavitation-bubble cell sorter

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Microsystems & Nanoengineering 2022年第3期8卷 253-262页

作者： Zeheng Jiao Yong Han Jingjing Zhao Zixi Chao attila Tarmok Zheng You State Key Laboratory of Precision Measurement Technology and Instrument Tsinghua UniversityBeijing 100084China Department of Precision Instrument Tsinghua UniversityBeijing 100084China Beijing Laboratory for Biomedical Detection Technology and Instrument Tsinghua UniversityBeijing 100084China Department of Structural Biology Stanford UniversitySchool of MedicineStanfordCA 94305-5126USA Institute for Medical Informatics Statistics and Epidemiology(IMISE)University of LeipzigLeipzigGermany Department of Therapy Validation Fraunhofer Institute for Cell Therapy and Immunology IZILeipzigGermany

Precise and high-speed sorting of individual target cells from heterogeneous populations plays an imperative role in cell *** the conventional fluorescence-activated cell sorter(FACs)is capable of rapid and accurate cell sorting,it occupies a large volume of the instrument and inherently brings in aerosol generation as well as crosscontamination among *** sorting completed in a fully enclosed and disposable microfluidic chip has the potential to eliminate the above ***,current microfluidic cell sorters are hindered by the *** of the fabrication procedure and the off-chip *** this paper,a spark-cavitation-bubble-based fluorescence-activated cell sorter is developed to perform fast and accurate sorting in a microfluidic *** features a simple structure and an easy *** microfluidic sorter comprises a positive electrode of platinum and a negative electrode of tungsten,which are placed on the side of the main *** applying a high-voltage discharge on the pair of electrodes,a single spark cavitation bubble is created to deflect the target particle into the downstream collection *** sorter has a short switching time of 150μs and a long lifespan of more than 100 million workable *** addition,a novel control strategy is proposed to dynamically adjust the discharge time to stabilize the size of the cavitation bubble for continuous *** dynamic control of continuously triggering the sorter,the optimal delay time between fluorescence detection and cell sorting,and a theoretical model to predict the ideal sorting recovery and purity are studied to improve and evaluate the sorter *** experiments demonstrate that the sorting rate of target particles achieves 1200 eps,the total analysis throughput is up to 10,000 eps,the particles sorted at 4000 eps exhibit a purity greater than 80%and a recovery rate greater than 90%,and the sorting effect on the viability of HelLa cells is

关键词： sorting bubble cavitation

Kinetic-compartmental modelling of potassium-containing cellulose feedstock gasification

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Frontiers of Chemical Science and Engineering 2018年第4期12卷 708-717页

作者： attila Egedy Livia Gyurik Tamas Varga Jun Zou Norbert Miskolczi Haiping Yang Institute of Chemical and Process Engineering University of PannoniaVeszprem 8200Hungary State Key Laboratory of Coal Combustion Huazhong University of Science and TechnolgyWuhan 430074China

Biomass is of growing interest as a secondary energy source and can be converted to fuels with higher energy density especially by pyrolysis or gasification. Understanding the mechanism and the kinetics of biomass pyrolysis (thermal decomposition) and gasification (conversion of organic material to gases) could be the key to the design of industrial devices capable of processing vast amounts of biomass feedstock. In our work real product components obtained in pyrolysis were took into consideration as well as char and oil as lumped components, and the kinetic constants for a biomass model compound (cellulose) pyrolysis and gasification were identified based on a proposed simplified reaction mechanism within a compartment model structure. A laboratory scale reactor was used for the physical experiments containing consecutive fast pyrolysis and gasification stages using alkali metal (K) containing feedstock, which has a significant effect on the cellulose pyrolysis and gasification. The detailed model was implemented in MATLAB/Simulink environment, and the unknown kinetic parameters were identified based on experimental data. The model was validated based on measurement data, and a good agreement was found. Based on the validated first principle model the optimal parameters were determined as 0.15 mL/min steam flow rate, and 4% K content.

关键词： biomass pyrolysis kinetic parameter identification compartment modelling optimisation