Jan Přikryl

Czech Technical University in Prague | ČVUT · Department of Applied Mathematics (FD)

When designing new electric vehicles for urban transport, both vehicle producers and operators need to establish and verify requirements that the vehicle has to fulfil regarding, e.g., energy storage capacity, driving range, or battery wear. These requirements are typically verified using simulation tools that concentrate mostly on electrical quant...

Proper traffic simulation of electric vehicles, which draw energy from overhead wires, requires adequate modeling of traction infrastructure. Such vehicles include trains, trams or trolleybuses. Since the requested power demands depend on a traffic situation, the overhead wire DC electrical circuit is associated with a non-linear power flow problem...

The electrification of transport is one of the key parts of the present aim to reduce undesirable vehicular emissions in the atmosphere. While the full electrification of personal vehicles is mostly associated with employing a big battery pack on the board and charging on (static) charging stations, another interesting possibility appears in the ca...

Distributed control mechanisms have been studied in past decades in different application areas. Currently, multiagent systems are a popular topic also in ITS systems, where numerous approaches to distribution of system intelligence are being tested. One of the main problems in distributed control, however, remains the guarantee of reaching the glo...

The paper presents urban traffic control method suitable and tested for a small urban areas enabling more fluent traffic and thus increasing the throughput of the controlled area. The model is implemented in the adaptive Traffic Dependent Control module for higher control of the area designed for the optimization of the intersection signal plans, p...

The aim of this paper is to show how the Hodgkin-Huxley model of the neuron's membrane potential can be extended to a stochastic one. This extension can be done either by adding fluctuations to the equations of the model or by using Markov kinetic schemes' formalism. We are presenting a new extension of the model. This modification simplifies compu...

One of the key indicators of the quality of service for urban transportation control systems is the queue length. Even in unsaturated conditions, longer queues indicate longer travel delays and higher fuel consumption. With the exception of some expensive surveillance equipment, the queue length itself cannot be measured automatically, and manual m...

This paper introduces a new model of traffic flow between two signalized intersections. The model originated from our effort to improve older, macroscopic model [5] based on the conservation law of vehicles. In order to keep the proposed model simple and numerically tractable, we make several simplifications: we do not take into account acceleratio...

Stochastic Analysis of a Queue Length Model Using a Graphics Processing Unit Mathematical modeling is an inevitable part of system analysis and design in science and engineering. When a parametric mathematical description is used, the issue of the parameter estimation accuracy arises. Models with uncertain parameter values can be evaluated using va...

In the 1960s E. Fama developed the efficient market hypothesis (EMH) which asserts that the financial market is efficient if its prices are formed on the basis of all publicly available information. That means technical analysis cannot be used to predict and beat the market. Since then, it was widely examined and was mostly accepted by mathematicia...

Soft sensors are a valuable alternative to the traditional hardware sensors, which are indispensable in configuration of modern systems. They are often used in process industry, but other applications are possible. This paper describes a possible application of soft sensor for faulty measurement detection and reconstruction in urban traffic. One of...

One of the key indicators of traffic control quality in urban traffic control (UTC) systems is the queue length. Even in unsaturated conditions, longer queues indicate longer travel delays and higher fuel consumption. With the exception of some expensive surveillance equipment, the queue length itself cannot be measured directly. Many methods that...

One of the key indicators of traffic control quality in urban traffic control (UTC) systems is the queue length. Even in unsaturated conditions, longer queues indicate longer travel delays and higher fuel consumption. With the exception of some expensive surveillance equipment, the queue length itself cannot be measured directly. Many methods that...

Bayesian approach to decision-making is success-fully applied in control theory for design of control strategy. The approach is based on the assumption that only one decision-maker is an active part of the system. This assumption was recently relaxed yielding distributed Bayesian decision-making theory. This extension is useful for large distribute...

Bayesian approach to decision-making is successfully applied in control theory for design of control strategy. The approach is based on the assumption that only one decision-maker is an active part of the system. This assumption was recently relaxed yielding distributed Bayesian decision-making theory. This extension is useful for large distributed...

We present a new method for computing visibility from a polygonal region in the plane considering a set of line segments as occluders. The proposed method provides a comprehensive description of visibility from the given region. We represent sets of occluded rays using a hierarchical partitioning of dual space (line space). The line space partition...

This paper presents our work on an experimental system for visualisation of the light load. The light load is de- fined as the total amount of light radiation received by all areas of a 3D scene. The emphasis of the presented system lays on outdoor architectural scenes, but indoor scenes are handled as well. The aim of the system is to visualise th...

We develop concepts for presenting interactive content in form of a slideshow in a virtual environment, similar to conventional desktop presentation software. We demonstrate how traditional content like text and images can be integrated into 3D models and embedded applications to form a seamless presentation combining the advantages of traditional...

In this paper, we develop concepts for presenting interactive content in form of a slideshow in a virtual environment, similar to conventional desktop presentation software. We demonstrate how traditional content like text and images can be integrated into 3D models and embedded applications to form a seamless presentation combining the advantages...

In this report we present an experimental eciency study of spatial subdivision schemes for ray-shooting acceleration. Presented results are part of our eort to nd the long-discussed best eciency scheme from the statistical point of view. We propose four testing procedures evaluating the ray-shooting algorithm properties. We use these methods to pro...

In this paper we present a hierarchical Monte-Carlo radiosity algorithm driven by the view importance. Thealgorithm makes to possible to concentrate the computational effort on solution in the immediate environmentof the observer, trading the low solution quality in invisible areas for better quality in areas that arevisible for the observer. This...

This framework presents a new generic solution to arbitrary geometrical problems using the Virtual Walls concept. It is based on the geometric distribution of the given object space by virtual walls into cells. The solution of the global problem is achieved by iteration of computation local to each cell and combination of neighbouring solutions. Th...

With the advent of new technologies it is possible to create information systems that provide the required information in a userfriendly and natural way. New software tools allow us to generate realistic three-dimensional scenes which the user can walk through while searching for desired data. The nature of the information can be of two kinds. Stat...

this paper we will deal with image data compression. We will discuss various approaches to the image compression and we will present a new method which does not suffer from some disadvantages of methods widely used.

Real-time adaptive control of signalled intersections is a challenging task. In our paper we will present a software framework built in MATLAB programming environment that makes it possible to conduct clean control experiments with a selected urban traffic network model. Our software image consist of four self-contained modules which make it possib...

The traditional way of controlling urban traffic is using centralised control ap-proaches: There is a single control centre where decisions are made about the traffic con-trol in the whole urban area. Currently, this paradigm is shifting towards more decen-tralised hierarchical approaches with smaller control centres serving sub-regions of the inte...