PB3: Contributed Session

Room: Old Main Academic Center 3070

Webex Link

Chair: Davood Damircheli

Victor Holotescu,  Politehnica University of Timișoara

Time: 2:40 pm - 3:00 pm (CST)

Title: Building a Blockchain-based Reputation Infrastructure for Open Research. Case study: the EERIS Network


The article presents a Blockchain-based Reputation Infrastructure for Open Research, developed for the platform “Engage in the European Research Infrastructures System” (EERIS). The novel idea is to build an infrastructure not only to measure the reputation of the research centers, but also to make them more visible and, above all, to provide an ecosystem for their growth through open research facilities, in line with recent UNESCO and European strategies. Reputation could be seen as a global perception of an entity's behavior based on the trust established by the other entities in a system. The introductory part of the paper realizes an evaluation of Blockchain-based reputation systems used in education and research, then justifying the advantages of using Blockchain technology for implementing reputation systems and for open research. The proposed solution is a Blockchain network based on Hyperledger Fabric, on which the activities of the identities on the platform are conducted, offering features for storing digital credentials, open research data, and contracts for technology transfer on Blockchain. We present the performance benchmarks for the network by looking at a series of metrics, followed by a series of simulations of the reputation evolution, stemming from the piloting of 3 Romanian University usecases.

(Joint work with Carmen Holotescu, Cosmin Cioranu, and Radu Vasiu)

Ludovic Dan LEMLE, University Politehnica Timisoara

Time:  3:00 pm - 3:20 pm (CST)

Title: On the Lie-Trotter product formula for equicontinuous C0-semi-groups on the dual of a locally convex vector space


In this talk is presented a satisfactory version of the Lie-Trotter product formula for equicontinuous C0-semi-groups on the dual of a locally convex vector space. An application of the Lie-Trotter product formula is given for the generalized  Schrödinger operator on .

Septimiu Lica, Politehnica University Timisoara

Time:  3:20 pm - 3:40 pm (CST)

Title: A New Step-Up-Down Quadratic DC-DC Converter


A new step-up-down quadratic dc-dc topology is proposed, and the dc analysis is performed to obtain its mathematical model. It is found that the proposed converter has a wide dc conversion ratio. The current and voltage stresses and ripples, together with continuous conduction mode (CCM) operation conditions are then calculated. Then, a design algorithm is proposed together with an example implemented in MATLAB™. The state-space model is derived both for the ideal case and considering the conduction losses. The control to output transfer function and audiosusceptibility are computed and they are of forth order. Simulations are conducted in the CASPOC software to validate the theoretical assumptions. It is shown how the control to output transfer function can be approximated by a transfer function with two poles only. Based on this approximation, the controller may be designed using the classical techniques and a usual controller can be used, that are wide available as integrated circuits (ICs), requiring only the calculation of elements from the feedback loop of the error amplifier. An example is presented and simulated to prove the correct operation of the closed loop system.

Muguras Mocofan, Politehnica University Timisoara 

Time:  3:40 pm - 4:00 pm (CST)

Title: The Water Waves Behavior Evaluation Using an Approach Based on Dynamic Textures


Ocean waves offer a very wide variety of dynamic textures. One of the major objectives of our study is to build tools for spatial-temporal analysis which are adapted to the dynamic texture. The paper proposes for ocean waves analysis, a combination between 3D approaches of dynamic textures and time variations of the co-occurrence matrix features, as new dimension. The main features used in our work are contrast, homogeneity, correlation, directivity and entropy calculated for 4 directions: front to back, left to right, top to bottom and for the 3D spatial translations.

By extending the analysis of texture from the static image, to the image sequences it is important to consider the properties of the dynamic textures in order to be able to effectively characterize it.

Take into account all analyzed cases with ocean waves we can state the following conclusions:

  • The classical study in direction front to back do not offer information about the content of the images, but we obtain the evolution in time (if are some changes in the general evolution of waves).
  • The directions left to right and top to bottom describe much better the dynamic textures considering the entire sequences as an image. For example, the contrast characteristics of 649f510 texture in direction top to bottom highlight very well the position of waves.
  • The 3D direction of the co-occurrence matrix translations describes better the dynamic of the texture (the motion from the video sequence).

The number of characteristics proposed for the analysis is very high, sometimes redundant. For particular cases we can choose a smaller number, very well chosen, characteristics in order to detect a particular problem. Analysis of ocean waves using the features of the co-occurrence matrix for various translations (in different directions and at different distances) permit us to obtain very useful information about their behavior. It provides a good description of the texture changes over the time, keeping the correlation with usual verbal expressions as: granularity, contrast and entropy.

All the dynamic textures with ocean waves used in our study are from the DynTex database. The future work will be oriented to a multiresolution decomposition for the dynamic textures and to detect small texture part from a video sequence.

(joint work with Ciprian Orhei, Florin Alexa, and Silviu Vert)

Mihaela Violeta Pișleagă, Polytechnic University of Timisoara

Time:  4:00 pm - 4:20 pm (CST)

Title: Analysis of renewable energy supply in Romania in order to transition to a future with zero CO2 emissions


In the introductory part, the paper aims to present the energy resources and the fields in which they are used. We will answer the question: What are the most important sources of non-fossil energy that we can rely on for a zero-carbon net energy system in Romania? The case study will include an analysis of the decarbonization of Romania's energy supply. We will make a Sankey diagram for the study area that will show how primary energy is currently being transformed into electricity, heat and transportation to meet energy needs. We will propose a new version of the Sankey diagram in which all fossil fuels will be replaced with renewable energy resources. At the end of the paper we will make an analysis on the cost, technical and social feasibility of the proposed solution.