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Point Process Flows [article]

Nazanin Mehrasa, Ruizhi Deng, Mohamed Osama Ahmed, Bo Chang, Jiawei He, Thibaut Durand, Marcus Brubaker, Greg Mori
2019 arXiv   pre-print
We propose an intensity-free framework that directly models the point process distribution by utilizing normalizing flows.  ...  Event sequences can be modeled by temporal point processes (TPPs) to capture their asynchronous and probabilistic nature.  ...  The proposed point process flow (PPF) directly models the point process distribution with normalizing flow and utilizes a recurrent variational autoencoder to encode the history of a given event sequence  ... 
arXiv:1910.08281v3 fatcat:ihvpycyk4jcjjce2ruuu7ojj5u

Prediction of flow dynamics using point processes

Yoshito Hirata, Thomas Stemler, Deniz Eroglu, Norbert Marwan
2018 Chaos  
, or a standard point process [25] .  ...  We choose Σ to be perpendicular to the flow at a point of the trajectory and the size of Σ is given by its radius r (c.f. Fig. 1(a) ).  ... 
doi:10.1063/1.5016219 pmid:29390614 fatcat:icxlvoqwmbgm5b2otfs6e6dv7i

Characterizing unidirectional couplings between point processes and flows

R. G. Andrzejak, T. Kreuz
2011 Europhysics letters  
couplings between point processes and flows [3] .  ...  Synchronous distance matrices for point processes and flows.  ...  So far we considered results for the case that both dynamics are point processes (X P H , Y P H ).  ... 
doi:10.1209/0295-5075/96/50012 fatcat:ogdjbwwncje2bcamdjbzyez634

System Design Flow and Fixed-Point Arithmetic [chapter]

2011 Digital Design of Signal Processing Systems  
point variables Digital Design of Signal Processing Systems, John Wiley & Sons by Dr.  ...  format N-bit binary number assumes n bits to the left and m bits to the right of the binary point Digital Design of Signal Processing Systems, John Wiley & Sons by Dr.  ...  can improve the precision for block processing of data  ... 
doi:10.1002/9780470974681.ch3 fatcat:2kfafos5ufeopirbqb5vbknngq

Maximum network flow with floating point arithmetic

Ernst Althaus, Kurt Mehlhorn
1998 Information Processing Letters  
We discuss the implementation of network ow algorithms in oating point arithmetic. We give an example to illustrate the di culties that may arise when oating point arithmetic is used without care.  ...  The scheme carefully scales the capacities such that all integers arising can be handled exactly using oating point arithmetic.  ...  An Approximation Algorithm when an Upper Bound on the Flow is Known In this section we show how to compute an approximate ow when an upper bound on the ow is known.  ... 
doi:10.1016/s0020-0190(98)00043-x fatcat:enlnhdycwna5jfmf5bws4wthc4

Choosing the Optimal Multi-Point Iterative Method for the Colebrook Flow Friction Equation

Pavel Praks, Dejan Brkić
2018 Processes  
On the other hand, numerous more powerful iterative methods such as three- or two-point methods, etc. are available.  ...  The most powerful three-point methods require, in the worst case, only two iterations to reach the final solution.  ...  Calculation of flow through complex networks of pipes such as for water or gas distribution requires multiple evaluations of flow friction factor [18] [19] [20] [21] [22] [23] .  ... 
doi:10.3390/pr6080130 fatcat:6jymldg5trgk3pmobwh6o4w5yi

Dependability of the information flow process at an intermodal transhipment point

Justyna Świeboda
2017 Journal of KONBiN  
Each logistics system is a distinguished parallel flow of cargo and information. Both of these flows are dependent on each other and have an impact on the correctness of performing tasks.  ...  DEPENDABILITY OF THE INFORMATION FLOW PROCESS AT AN INTERMODAL TRANSHIPMENT POINT Introduction The inland terminal is a complex man-machine-environment system [18] .  ...  Disruptions at trans-shipment points can have a negative effect on the flow of loads in intermodal transport and affect the entire logistics chain.  ... 
doi:10.1515/jok-2017-0021 fatcat:s5psonezs5cnbgnc5l47fplf5y

3D Reconstruction of Funnel Flow Boundary Using Automatic Point Set Extraction

Selam Waktola, Krzysztof Grudzien, Laurent Babout
2015 Image Processing & Communications  
The method clearly shows the boundary between the funnel flow and stagnant zone during silo discharging process.  ...  By extracting and connecting those jump points gave us a boundary line of the funnel flow from the stagnant.  ...  Mass flow and funnel flow are the two main types of flows appearing during concentric silo emptying. Mass flow is the most desired outcome during silo discharging process [2, 14] .  ... 
doi:10.1515/ipc-2015-0038 fatcat:k3pp7tbivjfobhuzytjrl5xttu

Classifying Best Access Points for Return of External Flows into Flowsheets

Pejman Oghazi
2011 The Open Mineral Processing Journal  
By using Particle Texture Analysis to investigate external flows and compare them with existing ordinary flows it is possible to pinpoint from a process mineralogy via point to what extent the external  ...  External flows are process streams that come from auxiliary processes or events.  ...  • Optimise the process by sending external flows to the best access point in the main flowsheet • Reduce any overloading in any process step by decreasing unnecessary volumetric flows Table 1 . 1  ... 
doi:10.2174/18748414001104010001 fatcat:wyttbb4cpvh6hkyydputylsjq4

Reliable Fixed-Point Implementation of Linear Data-Flows

Thibault Hilaire, Anastasia Volkova, Maminionja Ravoson
2016 2016 IEEE International Workshop on Signal Processing Systems (SiPS)  
In this article, we propose a complete methodology to implement a signal processing or control-engineering algorithm described with a linear data-flow into numerical code using fixed-point arithmetic.  ...  This process is unsatisfactory for various reasons. First, a finite-precision (floating-point) simulation is taken as a reference for comparison which can be inaccurate.  ...  Our complete flow from data-flow system to fixed-point code is described in Section II with some necessary prerequisites.  ... 
doi:10.1109/sips.2016.24 dblp:conf/sips/HilaireVR16 fatcat:4kw6iq6ocvhtletplpaviqa6hu

Point process-based modeling of multiple debris flow landslides using INLA: an application to the 2009 Messina disaster [article]

Luigi Lombardo, Thomas Opitz, Raphael Huser
2017 arXiv   pre-print
We develop a stochastic modeling approach based on spatial point processes of log-Gaussian Cox type for a collection of around 5000 landslide events provoked by a precipitation trigger in Sicily, Italy  ...  Here we integrate both mapping units into a single hierarchical model, by treating the landslide triggering locations as a random point pattern.  ...  the satellite images used to generate the landslide inventory were obtained thanks to the European Space Agency Project (ID: 14151) titled: A remote sensing based approach for storm triggered debris flow  ... 
arXiv:1708.03156v1 fatcat:x7qdqdawp5awffbij5tq6qqfne

Classifying Best Access Points for Return of External Flows into Flowsheets

Pejman Oghazi, Bertil Palsson, Kent Tano
2010 The Open Mineral Processing Journal  
By using Particle Texture Analysis (PTA) to investigate external flows and compare them with existing ordinary flows, it is possible to pin-point from a process mineralogy point of view to what extent  ...  External flows are process streams that come from auxiliary processes or events.  ...  Kari Moen, NTNU, Norway for supervising and helping with the process mineralogy analyses.  ... 
doi:10.2174/1874841401104010001 fatcat:b2376rwixbar7gz4pg3ipdt46i

Analysis of switched-capacitor circuits using driving-point signal-flow graphs

Hanspeter Schmid, Alex Huber
2018 Analog Integrated Circuits and Signal Processing  
This paper extends the driving-point signal-flow graphs to switched-capacitor (SC) circuits by introducing a new theoretical element: an auxiliary voltage source that transfers no charge.  ...  Calculation with a driving-point signal-flow graph The same calculation can now be done with signal-flow graphs. In this section we show how to do it systematically.  ...  The driving-point signal-flow graph (DPSFG) The most important aspect of a signal-flow graph that is to be used for hand analysis is that it maintains and represents causal relationships.  ... 
doi:10.1007/s10470-018-1131-7 fatcat:ksaj5tsuqrf57oaagioyx2qddq

Probabilistic properties of non-Gaussian piecewise-linear processes on Poisson flows with independent random values at points of flow

Vasily A. Ogorodnikov, Olga V. Sereseva
2018 Russian Journal of Numerical Analysis and Mathematical Modelling  
The paper is focused on study of non-stationary piecewise-linear processes on Poisson point flows with independent identically distributed random variables at support points.  ...  Using the method of direct simulation, it is shown numerically that the correlation function of the process has a point of inflection.  ...  Statistical characteristics of a piecewise-linear process on Poisson flows with independent identically distributed variables at support points In this paper we study an approach to calculation of the  ... 
doi:10.1515/rnam-2018-0005 fatcat:xvq4ac6l6fg73pnfmix364raka

Stagnation Point Flow with Time-Dependent Bionanofluid Past a Sheet: Richardson Extrapolation Technique

Kohilavani Naganthran, Md Faisal Md Basir, Sayer Obaid Alharbi, Roslinda Nazar, Anas M. Alwatban, Iskander Tlili
2019 Processes  
The study of laminar flow of heat and mass transfer over a moving surface in bionanofluid is of considerable interest because of its importance for industrial and technological processes such as fabrication  ...  The rate of heat transfer is found to be higher when the flow is decelerated past a stretching sheet.  ...  Nomenclature point flow past an impermeable stretching/shrinking sheet in a nanofluid containing gyrotactic microorganisms.  ... 
doi:10.3390/pr7100722 fatcat:ajllakgax5gdlhti6iq7oxs3su
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