bluuebunny/crossref_metadata_2025 huggingface dataset:
SELECTING A WAY TO NEUTRALIZE COMPROMISING ELECTROMAGNETIC EMANATIONS VIDEO INTERCEPTION USING THE MULTISIM ENVIRONMENT
Authors:   MTUCI, Shagrov N.A. , Bolshakov A.S. ,   MTUCI
Published: January 2023

Introduction: The paper considers issues related the interception of compromising electromagnetic emanations arising when displaying images on the monitor screen to ensure the necessary level of security of the processed data in computer systems. It is proposed to replace time-consuming full-scale tests by simulation in a virtual environment in order to choose the way to neutralize video interception of compromising electromagnetic emanations. Research objective: to develop a test bed on Multisim platform with components that simulate the characteristics of a real technical channel of compromising electromagnetic emanations interception. Methods: the article uses the method of calculating the range of interception of compromising electromagnetic emanations by the optimal receiver of the test signal "point-through point" generated in Multisim, which is an alternation of "white" and "black" pixels on the monitor, based on the ratio of signal to noise in the near, middle and far zones of the radiation source and allows to obtain a probabilistic assessment of the boundaries of the compromising electromagnetic emanations interception zone. Results: The proposed approach of modeling of video interception of computer equipment showed its universality and the possibility of replacing the field tests. Obtained numerical values of the extent of compromising electromagnetic emanations interception zones by the optimal receiver, taking into account the sensitivity of the received antenna in different frequency ranges of the spectral components of the informative video signal indicate the need to create measures for neutralization of emissions in a wide frequency range due to numerical values of the spectral components of higher order harmonics. Practical significance: the developed test bed in conjunction with the used methodology for assessing the compromising electromagnetic emanations interception zone allows to choose information protection measures in the form of active or passive method of neutralization of the technical channel of information leakage in accordance with the proposed algorithms.
A DEEP CONVOLUTIONAL NEURAL NETWORK TRAINING TECHNIQUE FOR REMOTE SENSING ROBUST OBJECT LOCALIZATION
Authors:   Moscow Technical University of Communications and Informatics, Ilina O.V. , Tereshonok M.V. ,   Moscow Technical University of Communications and Informatics
Published: January 2023

Intoduction: At present, aerial photographic object detection systems using deep convolutional neural networks are heavily used. However, in the case of remote sensing of the Earth, the quality of images can be extremely low due to a variety of negative phenomena. The most common distortion in the images is the Gaussian blur, which leads to a reduction in the clarity of the objects in these images, which in turn greatly reduces the effectiveness of the object detection system. Purpose: the purpose of the paper is to improve robustness (distortion performance) of the convoluted neural network in the system of localization of objects on blurred aerial photographs without the use of additional pre-processing or post-processing units, which results in unnecessary computing costs. Methods: to achieve the main goal, using training data augmentation by including blurred images with various levels of distortion is proposed. Results: The simulation has shown that, as the fraction of distorted images increases and the level of distortion raises, the training dataset increases the metric of the average recall of the vehicle localization system on distorted test images. At the same time, however, there is a decline in the metric of intersection of the predicted regions of interest with the true objects in the same distorted test images. The study has shown the existence of an optimal level of image distortion in the training dataset to produce the most stable (robust) deep convolutional neural networks. Problem is solved on the example of localization of vehicles on aerial photographs of the Earth. Practical relevance: the proposed method makes it possible to increase the efficiency of the system for localizing objects on distort! ed aerial images without increasing the computational complexity. Discussion: Further detailed studies of deep convolutional neural networks behavior in the real world, namely, under various image distortions, will allow to increase robustness in a wide variety of situations.
LABELING STILL IMAGES USING FRACTAL GAUSSIAN NOISE AND 2D DISCRETE WAVELET TRANSFORM FOR COPYRIGHT PROTECTION
Authors:   Moscow Technical University of Communications and Informatics, Magomedova D.I.
Published: January 2023

Introduction. The relevance of copyright protection for multimedia content is determined by the using digital objects in all areas of life. The number and qualification of malefactors aimed at using someone else's intellectual work is constantly growing. The problem of copyright protection can be solved by using steganography methods. Despite the wide development of the topic, there are a number of problems that limit the use of classical steganography methods. The resistance of many well-known methods to unauthorized access is based on knowledge of the algorithm without the use of additional keys. This leaves the methods vulnerable to modification and removal of the embedded label by an intruder. The aim of the study is to increase the stability of copyright protection algorithms from unauthorized access. It is proposed to embed watermarks in two stages: at the first stage, the digital watermark values are replaced by sequences of fractal Gaussian noise, then the resulting fractal key is embedded in the protected image by replacing the wavelet decomposition coefficients. Methods: The fast Fourier transform algorithm was used to generate fractal Gaussian noise. The Hurst exponent of noise sequences was estimated using R/S analysis. Results: A new algorithm for embedding digital watermarks into images based on fractal Gaussian noise and discrete wavelet transform is proposed. The values of rational parameters of the algorithm, such as the decomposition level, the scaling factor, the length of the noise sequence, the values of the Hurst exponent for a single sequence, and the threshold value, are determined to achieve the best balance between the quality of embedding and extraction.
METHODS FOR ENSURING THE RELIABILITY OF RADIO ELECTRONIC DEVICES
Authors:   Samara National Research University named after Academician S.P. Korolev, Stolbinsky D.V. , Bem P.P. ,   Samara National Research University named after Academician S.P. Korolev, Andreev V.A. ,   Samara National Research University named after Academician S.P. Korolev
Published: January 2023

Introduction. Modern society is highly dependent on electronic devices. They cover both household and industrial spheres of society, both in Russia and in foreign countries. Therefore, both domestic and foreign researchers are studying methods for ensuring the safety and reliability of the operation of radio-electronic devices, which determines the relevance of the topic under consideration. The purpose of the work is to consider the ideas of domestic and foreign researchers about the methods and approaches to ensuring the reliability of radio electronic devices. Methods: the method of dialectical materialism, the method of comparison and analogy, as well as the analysis and synthesis of the collected information. These methods will allow to reveal the issues of methodology from the position of domestic and foreign researchers, as well as to determine the best approaches for modern conditions for the distribution of radio electronics. The novelty of the work lies in the systematization of the views of domestic and foreign researchers on the problem of monitoring the activities of the PRUE. Results: the article will draw conclusions about the prospects of existing methods and the need for further study of this issue. Practical significance: the presented analysis can be used as a basis for applied research, as well as a guide for enterprises installing radio electronic devices. БЕСПЕЧЕНИЯ НАДЕЖНОСТИ РАДИОЭЛЕКТРОННЫХ УСТРОЙСТВ
HYBRID WAY TO ENSURE USER PRIVACY WHEN WORKING WITH A WEB-BROWSER
Authors:   Moscow Technical University of Communications and Informatics, Sheluhin O.I. , Igumnov V.O. ,   Moscow Technical University of Communications and Informatics
Published: January 2023

Introduction: One of the most common privacy vulnerabilities on the Internet is digital tracking that identifies users, which includes cookies and digital fingerprinting mechanisms. A comparative analysis of existing modern web tracking methods shows that approaches that rely on detecting and blocking web trackers are less effective than ones using value spoofing, since they do not provide passive fingerprinting methods protection, and are also easily detectable and, as a consequence, are susceptible to being used user identification. To eliminate these shortcomings, new, generally combined, methods should be developed. Purpose is to analyze the main mechanisms and varieties of digital tracking, describe the principles of their operation and develop an effective hybrid method to counteract the digital fingerprinting of the user's device. Results: It is shown that fingerprint tracking is extremely dangerous, as it cannot be effectively blocked by the browser. To solve the problem, a hybrid method of spoofing transmitted data, including both randomization and unification, is proposed. This method is chosen due to the fact that it provides protection against known digital fingerprinting methods. In addition, the method lacks the tracker detection stage, that provides instant protection. Characteristics with a wider range of possible values, that are also difficult to unify (Canvas, WebGL, Audio) are proposed to be replaced with the real ones with the addition of minor distortions. Attributes that must comply with the value adequacy property and changing of which may disrupt the website will be unified. Consequently, it is proposed to unify HTTP headers and global JavaScript browser parameters. The software implementation of the described algorithm is made in the JavaScript programming language in the ECMAScript 6 specification using the standard of the Web-Extensions API cross-browser add-on development system.
DESIGN OF A LOW LATENCY ROUTER FOR ON-CHIP NETWORKS
Authors:   Linkoping University, Sathe Sumant , Wiklund Daniel ,   Linkoping University, Liu Dake ,   Linkoping University
Published: January 2023

A problem with long on-chip wires is the resulting delays, and repeater insertion becomes essential to mitigate this problem. Point-to-point wiring leads to an increase in the area and repeater insertion leads to an increase in power consumption. The complexity of System-on-Chip (SoC) designs continues to increase, and traditional bus-based interconnects will not be sufficient to manage the communication requirements of future billion transistor chips. The properties of our OCN are now reviewed. The OCN provides reliable communication. This is achieved by ensuring that data dropping is not allowed. On-Chip Network’s (OCN’s) provide a scalable alternative to existing on-chip interconnects. The key element of the OCN is the router. We present a prototype design of a 5-input, 5-output, scalable router. The router is constructed from a collection of parameterizable and reusable hardware blocks and is a basic building block of the OCN.
AN EXPERIMENTAL VERIFICATION OF NEW NON-QUASI-STATIC SMALL-SIGNAL MOSFET MODEL
Authors:   R&D Marine Technology Centre, Stefanski Tomasz , Kordalski Wieslaw J. ,   Gdansk University of Technology, Hauer Hans ,   Fraunhofer Institut Integrierte Schaltungen
Published: January 2023

This article presents the results of an experimental verification of the New Non-Quasi-Static (NQS) Small-Signal MOSFET Model proposed in [1,2]. This model is valid in all operating modes, from weak to strong inversion and from nonsaturation to saturation. For the purpose of verification test transistors with de-embedding, dummy structures in 0.35 m technology were designed. The procedure of de-embedding was based on the open-short [3] method, optimised for RF measurement up to 30 GHz. The results obtained have confirmed aplicability of the model for the small-signal MOSFET simulation.
A SERIES VOLTAGE REGULATOR INTEGRATED IN CMOS TECHNOLOGY
Authors:   Laboratoire d’electronique INP-ENSEEIHT, Tap-Beteille Helene , Lescure Marc ,   Laboratoire d’electronique INP-ENSEEIHT
Published: January 2023

Since the regulation of voltage supply is one of the most critical requirement of the electronic system design, the monolithic voltage regulator has become one of the most important building block of both analog and digital systems. This importance has been recently increased with the emergent low voltage technologies, encouraging industrials and researchers to work on new regulator structures. The voltage regulator presented here, has been first calculated and simulated through PSpice. The paper deals with the conception of a series voltage regulator integrated in 0.6Âµm CMOS technology. This type of regulators has become one of the most important building block of both analog and digital systems. It is constituted by a bandgap voltage reference and an error amplifier associated with a ballast element. The circuit obtained is unconditionally stable with good performances: a power-supply-rejection-ratio < 2%, an output resistance < 0.3 W and a temperature coefficient < 10 ppm. It is integrated on an ASIC for on board applications where low volume and low power consumption are key elements.
A MIXED TIME-FREQUENCY DOMAIN APPROACH FOR THE QUALITATIVE ANALYSIS OF AN HYSTERETIC OSCILLATOR
Authors:   Politecnico di Torino, Taillefer Chris , Bonnin M. ,   Politecnico di Torino, Gilli M. ,   Politecnico di Torino, Civalleri P. P. ,   Politecnico di Torino
Published: January 2023

Frequency domain techniques, like harmonic balance and describing function, are classical methods for studying and designing electronic oscillators and nonlinear microwave circuits. In most applications spectral techniques have been used for determining the steady-state behavior of nonlinear circuits that exhibit a single periodic attractor. On the other hand, the global dynamics of nonlinear networks and systems is usually investigated through time-domain techniques, that require to introduce rather complex and sophisticated concepts. Recently some HB based techniques have been proposed for investigating bifurcation processes in nonlinear circuits that present several attractors (the authors have considered systems that admits of a Lur’e representation). Their approach presents the advantages of providing a simple and qualitative description of the system dynamics, that can be effectively exploited for design purposes. In this manuscript we will examine a third order hysteretic oscillator, that cannot be decribed in the classical Lur’e form and we will show that its dynamics can be investigated through the joint application of the describing function technique and of a suitable time-domain method for estimating Floquet’s multipliers.
HIGH POWER AMPLIFIER PREDISTORTER ASIC IN STANDARD DIGITAL CMOS TECHNOLOGY
Authors:   ENSEEIHT, Tap-Beteille H. , Roviras D. ,   ENSEEIHT, Lescure M. ,   ENSEEIHT, Mallet A. ,   CNES
Published: January 2023

Satellite communications offer a wide coverage for global communication systems. In order to increase spectral efficiency, non constant modulus constellations are very attractive compared to the classical BPSK and QPSK schemes. A 16-QAM modulation could offer a significant increase in spectral efficiency for satellite communications. Because the available power on board the satellite is strongly limited, High Power Amplifiers (HPA) like Travelling Wave Tubes (TWT) or Solid State Power Amplifiers (SSPA) are generally operated near the saturation point with a low back off. When operated with such low back off, HPA are highly non linear amplifiers. So, the signal to amplify being strongly distorted, a predistorter has been developed. A high power amplifier predistorter has been implemented in 0.6 m CMOS technology. First, the predistorter is briefly described. Then, the implementation of the predistorter is shown. The circuits designed for the neuron first layer are described, as well as the simulation results obtained.
INTERNATIONAL CONFERENCE “ENGINEERING MANAGEMENT OF COMMUNICATION AND TECHNOLOGY” (EMCTECH). FINAL INFORMATION AND STATISTICS
Authors:   Institute of radio and information systems (IRIS), Dymkova Svetlana , Varlamov Oleg ,   Institute of radio and information systems (IRIS)
Published: January 2023

International conference “ENGINEERING MANAGEMENT OF COMMUNICATION AND TECHNOLOGY” (EMCTECH) was held on October 20-22, 2021 in Vienna (Austria). On EMCTECH-2021 was invited researchers, educators, managers, and students, which research activity, case studies or best practices, shedding light on the theory or practice of engineering, technology, innovation management, or development of personal skills, business and entrepreneurship. On EMCTECH-2021 IEEE in cooperation with Institute of Radio and Information Systems (IRIS) provide various opportunities for publishing results of research, based on international scientific and technical cooperation of researchers, PhD students and students in the field of radio and information systems.
A PROGRAMMABLE DSP CORE DESIGN FOR SPEECH/AUDIO CODEC SOC
Authors:   National Chiao-Tung University, Lin Chin-Teng , Chung Jen-Feng ,   National Chiao-Tung University, Liu Der-Jenq ,   National Chiao-Tung University
Published: January 2023

A novel programmable DSP core, called LASP24 (Low-cost Application-driven Speech Processor, with 24-bit data width), is developed. It is targeted as a wide-range platform of multimedia applications. The processor core is optimized to efficiently perform fundamental operations for speech/audio signal processing such as vector and matrix operations, and it can be easily embedded into the SOC platform. The design is fabricated with the UMC 0.18 m standard-cell technology in the total area of 6.5 mm2, and it can operate at 100 MHz. It has also been demonstrated that the MELP speech coding and the sound reverberation method could be executed in real-time on the LASP24 operating at 80 Mhz. The assembler and emulator environment have also been developed for designers to verify their algorithms.
NOISE ANALYSIS AND OPTIMIZATION OF GENERAL OTA-C FILTERS
Authors:   Gdansk University of Technology, Koziel Slawomir
Published: January 2023

In the paper, a general approach to noise analysis in continuous-time OTA-C filters is presented. Recently an increasing interest in the design of continuous-time filters based on the transconductance capacitor (OTA-C) technique has been observed. The operational transconductance amplifiers (OTAs) offer a higher bandwidth than their voltage-mode counterparts, can be easily tuned electronically, and have a better suitability for operating in reduced supply environment. Due to this, high frequency integrated filters are mostly realized as the OTA-C ones. Based on a matrix description of a general OTC filter topology, a universal formulas for evaluating the noise in any OTC filter are derived. The presented formulas can be easily implemented and used in computer-aided analysis/optimization software. The accuracy of the proposed method is confirmed by comparison with SPICE simulation. The example of application for finding the minimum-noise 5th order multiple-loop feedback filters implementing Butterworth and Bessel transfer functions is given.
COMPLEX HYBRID SYMBOLIC ANALYSIS OF NONLINEAR ANALOG CIRCUITS DRIVEN BY MULTI-TONE SIGNALS
Authors:   “Politehnica” University of Bucharest, Dumitriu Lucia , Iordache Mihai ,   “Politehnica” University of Bucharest, Luican Ilie ,   “Politehnica” University of Bucharest
Published: January 2023

The paper presents a general symbolic method for generating the complex hybrid matrix necessary for computing the periodic or nonperiodic steady-state response of a nonlinear analog circuit driven by multitone signals. This method is remarkable by its great efficiency and generality, and it is very useful in frequency-domain approach based on harmonic balance and least square approximation. For the general case of the nonperiodic steady-state response there are three basic methods: frequency-domain approach based on Voltera series; time-domain approach and a frequency-domain approach based on harmonic balance and least square approximation. The last one is significantly more efficient when the total number of nonlinear resistors, inductors and capacitors is significantly less than the total number of linear inductors and capacitors in the circuit, as is often the case in practice.
EARTH OBSERVATION AND GLOBAL NAVIGATION SATELLITE SYSTEMS ANALITICAL REPORT PART II (TIMING & SYNCHRONISATION OF TELECOMMUNICATION NETWORKS, MARITIME AND INLAND WATERWAYS, RAIL AND AUTOMOTIVE TRANSPORT)
Authors:   Institute of radio and information systems (IRIS), Dymkova Svetlana
Published: January 2023

The EU Space Programme is a business growth enabler that stimulates the economy and pushes the bar of innovation. The EUSPA EO & GNSS Market Report is the ultimate guide to anyone who seeks to make the EU Satellite Navigation and Earth Observation technologies part of their business plan and develop new space downstream applications. More than ever society relies on innovative solutions to deal with the big data paradigm. Earth Observation (EO) and Global Navigation Satellite System (GNSS) data is becoming increasingly important to these innovative solutions through dozens of applications that are emerging or already in use by citizens, businesses, governments, industry, international organisations, NGOs and researchers around the world. The study provides analytical information on the dynamic GNSS and EO markets, along with indepthanalyses of the latest global trends and developments through illustrated examples and use cases. Using advanced econometric models, it also offers market evolution forecasts of GNSS shipments or EO revenues spanning to 2031. This article represent the brief overview essential role of space data across market segments including, timing & synchronisation of telecommunication networks, maritime and inland waterways, rail and automotive transport.
TOPICS IN COMMUNICATIONS WITH CHAOTIC SYSTEMS
Authors:   School of Computer and Communication Sciences Swiss Federal Institute of Technology Lausanne (EPFL), Hasler Martin , Schimming Thomas ,   School of Computer and Communication Sciences Swiss Federal Institute of Technology Lausanne (EPFL)
Published: January 2023

The use of chaotic systems in communications approaches the threshold for industrial applicability. We shall give here an overview over a few techniques we think are promising. However, this overview does not pretend to be complete and it contains personal views on the subject. Also, the use of chaotic system for information encryption is not discussed at all. Only a choice of methods for coding and modulation for the transmission of digital information will be presented. An overview of a number of techniques to transmit information using chaotic systems is given. The difficulties in obtaining a good performance of such systems with respect to channel noise leads to fundamental question, to which we give a possible answer. In particular it has been confirmed both in theory and by a constructive approach leading to a controlled variant of CSK, that indeed the information generated by free running chaotic systems (as captured by the Kolmogorov-Sinai entropy) is the problem, and the solution is a suitable control that makes this information part of the payload.
ERICSSON MOBILITY REPORT (REVIEW. PART I)
Authors:   Ericsson, Jonsson Peter
Published: January 2023

Resilient networks are the foundation for continued digitalization of societies and industries. Continuous network modernization and coverage build-out has led to several hundred million people becoming new mobile broadband subscribers every year. 5G is scaling faster than any previous mobile generation and we expect 5G subscriptions to reach 1 billion by the end of 2022. In several regions, deployment of 5G standalone networks is also picking up pace, as communications service providers prepare for innovation to address the business opportunities beyond enhanced mobile broadband. A solid digital network infrastructure underpins enterprises’ digital transformation plans, and their new capabilities can be turned into new customer services. As exemplified in this edition, service providers are looking to expand out of pure connectivity into service enablement platforms. Global mobile network data traffic has doubled in the last two years, driven by continuing growth in smartphone usage, mobile broadband and now the digitalization of societies and industries. But traffic is not the only thing that grows. The ongoing war in Europe, as well as increased geopolitical tension in the world, leads to a range of global threats – economic as well as social – that must be navigated. And in our field of networking, the threat landscape calls for constant diligence in keeping ahead with security. You can read more about security in this edition. Managing the continued strong traffic growth while reducing energy consumption is also a top priority. Older technologies are being replaced by continuous build-out of 4G and 5G networks, substantially improving network performance and energy efficiency with each generation. 5G technologies play a key role in modernization, providing multiples of capacity while becoming more energy efficient. Innovative network technologies enable service providers to introduce new services that in turn support societies and enterprises to reduce their carbon emission footprint. In this edition, we share some examples of how 4G and 5G technologies make it possible to unleash the power of IoT connectivity to enhance both enterprises’ business performance and sustainability.
DRM DIGITAL BROADCASTING SYSTEM AUDIO PATH QUALITATIVE CHARACTERISTICS
Authors:   Institute of Radio and Information Systems (IRIS), Varlamov O.V.
Published: January 2023

The Digital Radio Mondiale (DRM) digital broadcasting system is the only ITU-approved digital broadcasting system for the LF, MF and HF bands. Numerous theoretical and field studies, as well as operating experience over the past 20 years, have allowed a good study of digital broadcasting networks organization according to this standard. However, some of the issues related to the audio path formal characteristics were not considered. The article discusses the audio coders used in the DRM system and the available data rates in various immunity modes. A set of test signals for instrumental measurements and listening has been developed. The results of experimental measurements for various data rates are presented. It is shown that the range of modulating frequencies in 7 modes of immunity is not narrower than for FM transmitters. In another 5 modes of noise immunity, the range of modulating frequencies is narrower than for FM transmitters, but wider than for AM transmitters. It is confirmed that at data rates of more than 16.5 kbps, the DRM transmitter signal quality becomes no worse than AM signal transmitter quality. Above 24 kbps, the DRM transmitter signal quality becomes comparable to that of an FM transmitter.
FIBER-OPTIC SENSOR OF THE OBJECT PERIMETER PROTECTION SYSTEM
Authors:   Azerbaijan Technical University, Mansurov Tofig Magomed ogly , Mammadov Rahman Salman ,   Azerbaijan Technical University, Mansurov Elnur Tofig ogly ,   Azerbaijan Technical University
Published: January 2023

An analysis of the existing fiber-optic sensors of the system for detecting unauthorized entry into the territory of a protected facility was carried out. It is noted that an attractive feature of such sensors is immunity to electromagnetic radiation and electrical safety. As a result of the analysis, it was concluded that the well-known fiber optic sensors alone can detect only the fact of unauthorized entry, and with a multizone security system – both the fact and the zone of unauthorized entry, but not the reason for the operation of the fiber optic sensor, i.e. parameter of the offending object (small animal, person or vehicle). To expand the functionality, a fiber-optic sensor has been developed that allows you to determine not only the fact of penetration, but also the parameters of the intruder object, namely its mass.An optical fiber was chosen for the developed fiber-optic sensor and an optical fiber macrobend shaper with the highest susceptibility to macrobend – G 655. It was found that an increase in the length of the macrobend arc at a constant macrobend shaper radius leads to an increase in the attenuation of the optical radiation signal in the optical fiber. It is indicated that this dependence is close to linear in the range of macrobending arc lengths from zero to pR.
INDUCERS OF ENDOGENOUS INTERFERON IN THE SERIES OF 6-ARYLAMINO-PYRIMIDINE-2,4(1H,3H)-DIONES: FROM DESIGN TO PRACTICE
Authors:   St Petersburg State Institute of Technology, Krutikov Victor I. , Erkin Andrey V. ,   St Petersburg State Institute of Technology, Tetz Viktor V. ,   Pavlov St Petersburg First State Medical University, Klaptyuk Irina V. ,   Saint-Petersburg University of the State Fire Service of the Ministry                                    of Emergency Situations of Russia
Published: January 2023

A series of 6-arylaminopyrimidine-2,4(1H,3H)-diones were synthesized via transamination of 6-aminouracil. Among the target compounds, 3-(2,6-dioxo-1,2,3,6-tetrahydropyrimidine-4-yl)aminobenzoic acid methyl ester proved to be an effective endogenous interferon inducer. During biological evaluation followed by a patenting procedure, the ester was assigned the ImmuVag international nonproprietary name.
Manipulative materials as mediation artifacts in problem solving
Authors: Deodato André Augusto , Faria Juliana Batista , Amâncio Roselene Alves
Published: January 2023

Curricular documents encourage the use of manipulative materials, revealing an expectation that they will contribute to the improvement of the teaching of Mathematics in basic education. In this article, we intend to analyze some productions of twelve by 6th grade students who used in the second semester of 2018 manipulative materials to solve two problems. Based on a Historical-Cultural perspective of learning, we seek to understand the potential of manipulative materials beyond planning, focusing on how learners appropriate these objects. Grounded in the assumptions of qualitative research, we analyzed students’ resolution strategies based on the reports of classes produced by undergraduate Mathematics students who were collaborators in the research. As the main results, we highlight that the appropriation of the manipulative material by the students led the resolution process and to the understanding of the possibility of replacing the manipulative material with a design. Thus, we infer that the use of such materials in addition to motivating is justified when they mediate problem solving.
The constitution of research groups in Mathematics Education in Brazil
Authors: Alves Carlos Alex , Silva Leandro Londero da
Published: January 2023

We analyze the constitution of the research groups in Mathematics Education in Brazil, registered in the Directory of Research Groups in Brazil of CNPq. The theoretical and methodological contributions are linked to Education and Mathematics Education, the norms/resolutions of CNPq and the descriptive survey research in a quanti-qualitative approach. The results showed a total of 569 groups, with significant growth since 2002, a predominance with up to 12 years of activity, concentrated in the Southeast and Northeast regions, but predominant in the states of São Paulo, Paraná, Minas Gerais, Bahia, Rio de Janeiro and Pará and in the Public Institutions, especially UTFPR and UNESP. The groups concentrate 15,085 people among researchers, students, technicians, and collaborators. We argue about the emergence of a research agenda that can privilege future studies around our investigative region.
Story Point Estimation Using Issue Reports With Deep Attention Neural Network
Authors: Kassem Haithem , Mahar Khaled , Saad Amani A.
Published: January 2023

Background: Estimating the effort required for software engineering tasks is incredibly tricky, but it is critical for project planning. Issue reports are frequently used in the agile community to describe tasks, and story points are used to estimate task effort.

Aim: This paper proposes a machine learning regression model for estimating the number of story points needed to solve a task. The system can be trained from raw input data to predict outcomes without the need for manual feature engineering.

Method: Hierarchical attention networks are used in the proposed model. It has two levels of attention mechanisms implemented at word and sentence levels. The model gradually constructs a document vector by grouping significant words into sentence vectors and then merging significant sentence vectors to create document vectors. Then, the document vectors are fed into a shallow neural network to predict the story point.

Results: The experiments show that the proposed approach outperforms the state-of-the-art technique Deep-S which uses Recurrent Highway Networks. The proposed model has improved Mean Absolute Error (MAE) by an average of 16.6% and has improved Median Absolute Error (MdAE) by an average of 53%.

Conclusion: An empirical evaluation shows that the proposed approach outperforms the previous work.
A pályakezdő tanárok tanulásának jellemzői
Authors: Péter Petra , Szivák Judit , Rapos Nóra , T. Kárász Judit
Published: January 2023

Tanulmányunk célja, hogy bemutassa a kezdő pedagógusok szakmai fejlődését és tanulási sajátosságait, és az ezeket befolyásoló faktorok jellemzőit. Az FSZF paradigmájából kiindulva vizsgáljuk, hogy mi jellemzi a pályakezdő pedagógusok tanulását, milyen támogató és gátló tényezőket azonosítanak és a személyes dimenziók (pl. a nézetek, a pályamotiváció) milyen módon jellemzik a kezdő tanárok tanulását. A pályakezdés időszakát egy, a tanárok számára a szakmai fejlődés és tanulás egyik legfontosabb, tanulási helyezetekkel teli fázisaként kezeljük. Az alábbiakban pedig azt mutatjuk be, hogy a MoTeL-kutatásban résztvevő kezdők tanulása milyen általánosítható jellemzőket mutat.
Karantina yapılanmaları: Klazomen tahaffuzhanesi örneği
Authors: GAZİ GEZGİN Aylin
Published: January 2023

Bulaşıcı hastalıkların yayılımını önlemek amacı ile şüpheli görülenlerin ve eşyaların belirli bir süre bekletilmesine “karantina” denilmektedir. Karantina süreçlerinin geçirildiği yapılar Avrupa’da “Lazzaretto” Osmanlı Devleti’nde ise “tahaffuzhane” olarak isimlendirilmektedir. İlk olarak 14. yüzyılda uygulanmaya başlayan karantina süreçleri, 20. yüzyıla kadar Avrupa başta olmak üzere dünyanın birçok noktasında uygulanmasına rağmen, bu işlevin yerine getirildiği mimari yapılanmalar çok az çalışmada ele alınmıştır. Bu yazının amacı, büyük bir kısmı ayakta kalmış Klazomen Tahaffuzhanesi’nin özgün mimari yapılanmasını ortaya çıkarmaktadır. Bu amaçla, öncelikle 14. yüzyıldan 19. yüzyıla kadar inşa edilmiş karantina yapılanmaları “yer seçimi”, “yerleşim şeması” ve “iç mekân kurgusu” üzerinden ele alınarak karantina işlevine ait yapılanmaların genel mimari özellikleri tanımlanmıştır. Klazomen Tahaffuzhanesi’nin yer aldığı Karantina Ada’sında yapılan incelemelerde elde edilen veriler öncelikle arşiv ve literatür incelemeleri karşılaştırılmış, elde edilen sonuçlar karantina işlevine yönelik mimari yapılanmaların genel özellikleri üzerinden yorumlanarak Klazomen Tahaffuzhanesi’nin 19. yüzyıldaki özgün yapılanması “yer seçimi”, “yerleşim şeması” ve “iç mekân kurgusu” üzerinden tanımlanmıştır.
Vandalismo à propriedade pública: expressões motivacionais e abordagens preventivas para cidade do Kilamba
Authors: Boma Milton Ramiro Capita
Published: January 2023

Este artigo tem como objetivo analisar as expressões motivacionais do vandalismo dirigido à propriedade pública. O texto enquadra diferentes teorias criminológicas na explicação e prevenção do fenómeno. A classificação dos subtipos de vandalismo estabelecida por Cohen (1984) e as abordagens sociais propostas por Barker e Bridgeman (1994), Goldstein (1996), Levy-Leboyer (1984), Ross (1984) e Merrills (2009) orientaram o estudo do ponto de vista da literatura. Metodologicamente trata-se de um estudo descritivo com abordagem quantitativa. Para a coleta dos dados foi aplicado um inquérito, construído com perguntas fechadas adaptado com base na escala nominal de Likert. Foram inquiridos 310 cidadãos residentes, e não só, que transitam diariamente na Cidade do Kilamba. Os resultados indicam a existência de uma forte tendência ao vandalismo aquisitivo, expresso pela remoção de equipamentos, motivado pela busca de ganho material privado. Além de ações oportunistas são evidentes incivilidades e falta de consciência no uso de espaços e estruturas de utilidade pública. O estudo identificou pela perceção dos cidadãos inquiridos que o mobiliário urbano e os espaços verdes apresentam caraterísticas de abandono, falta de estrutura de proteção e manutenção, sendo alvos preferenciais de vândalos. A pesquisa concluiu que há uma série de condições sociais e físicas como design, arquitetura e decadência das malhas urbanas capazes de produzir atos de vandalismo. O fenómeno tem afetado a ordem pública, o funcionamento e a acessibilidade dos serviços públicos como distribuição de água e eletricidade. As estratégias de prevenção passam por medidas dissuasivas, manutenção e conceção de estruturas protetivas de instalações públicas na cidade.
Conformidade legal no ensino superior em Angola: criação de um instrumento de gestão das obrigações legais
Authors: Canoquena João , Rodriguez Maria , Cabrera Yanisleidy
Published: January 2023

O quadro legal angolano para o subsistema de ensino superior cresceu significativamente desde 2009, um crescimento que tem estado a visar o aumento da transparência e da qualidade dos processos educacionais nas instituições de ensino superior (IES) angolanas. Entretanto, a qualidade do ensino superior em Angola não sofreu melhorias significativas por não se estar a cumprir escrupulosamente com o quadro legal de forma sistemática, o que tem resultado em encerramentos de cursos e instituições do ensino superior. Este artigo tem como objetivo principal desenvolver um instrumento de auto- monitorização da conformidade legal que pode ajudar as IES angolanas a tirarem mais proveito do quadro legal do ensino superior. Por intermédio de um levantamento bibliográfico das leis relevantes ao ensino superior em Angola, a identificação de obrigações legais nestas e o desenvolvimento de uma série de tabelas de verificação de conformidade, este estudo apresenta uma checklist de auto verificação da conformidade entre o funcionamento das instituições do ensino superior e o quadro legal relevante ao ensino superior em Angola. Pela utilização deste instrumento, foi possível dissecar as obrigações legais em requisitos ou critérios. Foi também possível estabelecer três graus de conformidade legal, nomeadamente: total, parcial e nenhuma. Notou-se, de igual forma, a existência de um total de 83 obrigações legais das instituições do ensino superior em Angola, sendo os regulamentos e as normas as fontes do maior número de obrigações. Destes, existem entre cinco a quinze requisitos legais por obrigação, perfazendo um volume enorme de requisitos legais com os quais as IES em Angola devem mostrar conformidade legal. A aplicação da checklist permite a gestão desse leque diverso e numeroso de requisitos específicos legais. São sugeridas várias medidas complementares ao quadro legal que devem ser implementadas em Angola com o intuito de se criar uma cultura de conformidade legal no ensino superior, promovendo-se, deste modo, a sua qualidade.
A importância do ERP em empresas de logística, o caso de uma organização de médio porte
Authors: Souza de Jesus Samuel Malta , Gomes Fabio Fonseca Barbosa , Santana Angela Peixoto , Pimenta Igor Gonzalez
Published: January 2023

O presente trabalho é um estudo sobre o uso de sistemas de planeamento de recursos empresariais voltado para o campo da logística. Ele que teve início em 1990 e tem sido usado como uma grande ferramenta de gestão nas empresas de vários segmentos. O objetivo deste trabalho é analisar, através de um quadro comparativo entre várias empresas da área de Logística, quais são os ERPs mais utilizados. Além disso também é apresentado o caso de uma implantação de sistema Enterprise Resource Planning (Planeamento de Recursos Empresariais) em uma empresa de logística. Para isso, foi feita uma análise em alguns setores na empresa. Dessa forma, iniciou-se uma pesquisa com levantamento de informações analisadas e identificas de cada setor, de como ficariam os processos, caso fosse feita a implementação do sistema ERP para a gestão e controlo das atividades por setores. O estudo teórico analisa a implantação de sistemas ERP sob a perspetiva do conceito de sistema, considerando tanto a mudança tecnológica trazendo uma tendência de automação nos processos, como também a modificação na estrutura da gestão a nível estratégico, tático e operacional.
Representación de la mujer negra desde el audiovisual: Análisis de los cortometrajes Cores e Botas (2010) y O Dia de Jerusa (2014)
Authors: Camacho Cuzquen Raul , Bruch Deitos Miguel , dos Santos Robert Rafael
Published: January 2023

Este artículo trata de la representación de la mujer afrobrasileña en la industria audiovisual de Brasil. Para eso, primero levantamos datos técnico-teóricos sobre el estado del cine brasileño en relación con la representación de la etnia negra. Puede verse a través de estos, un racismo estructural vigente en el sector, además de la exclusión de género. Por lo tanto, buscamos analizar si dos cortometrajes de circulación periférica, dirigidos por mujeres negras, se ajustan al Dogma Feijoada (Carvalho & Domingues, 2018): Cores e Botas (Juliana Vicente, 2010) y O dia de Jerusa (Viviane Ferreira, 2014). A la vista de los apuntes sobre la representación en César dos Santos y Berardo (2013), Raiter (2001) y Jaguaribe y Lissovsky (2014) optamos por un análisis figural de las dos películas, según Dubois (2012) y Brenez (1998). Así, encontramos en ellas elaboraciones plásticas capaces de contribuir a cuestionar la representación de la mujer afrobrasileña.
Miniaturization of Microstrip Patch Antenna for Biomedical Applications
Authors: Bhadoriya Ranjeet Pratap Singh , Sharma Neha , Gupta Deeksha , Singh Divya
Published: January 2023

In this study, a novel quad-band antenna for biomedical applications was designed, fabricated and analyzed. Biomedical application defines the use of antenna in detecting cancerous cells and its cure using hyperthermia. In this research paper, a rectangular micro strip patch antenna is modified with the circular and pentagonal shapes of negative media (Metamaterial). Antenna was reduced in size and ameliorated to operate on multiple frequency bands. Ameliorated antenna is operating at 1GHz also, which is the substantial operating frequency of cancer detecting tissues. Inclusion of metamaterial increased the bandwidth of and subsequently ameliorate the size of the proposed antenna.
Electromagnetic Band Gap based compact UWB Antenna with Dual Band Notch Response
Authors: Babu P. Raveendra , Dasari Rama Krishna
Published: January 2023

In Antenna Technology, Electromagnetic Band Gap (EBG) structures are one of the mostly used structures to improve gain of antenna, suppress surface waves and band notching. In UWB frequency spectrum more number of small frequency bands are exists and these bands cause electromagnetic interference, to reject such bands more number of EBG structures are required. Due to limited monopole antenna's ground plane, it is required to have EBG with small in size and single EBG to reject two or more bands. The simulated results of proposed new C-shaped EBG by placing near the feedline of fork-shape Ultra-Wide Band (UWB) antenna to reject two bands namely Lower Wireless Local Area Network(L-WLAN) band range from 5.15 GHz to 5.35GHz and X-band of satellite downlink communications networks (7.25GHz –7.75GHz) within a UWB antenna's spectrum and EBG occupying less area compared with the reported Conventional Mushroom Type (CMT) EBG, semi-circular EBG, slotted-patch ELV EBG and TVS EBG. Fabrication and measurement results of the newly proposed antenna attain an enormous bandwidth i.e., from 2.8 GHz to 11.5 GHz while eliminating frequency bands between 5.15 GHz to 5.35 GHz (Lower WLAN) & 7.25GHz to 7.75GHz (X-band of satellite downlink).
Power Flow Parameter Estimation in Power System Using Machine Learning Techniques Under Varying Load Conditions
Authors: Ramasamy Saravanakumar , Ganesan Koperundevi , Arunachalam Venkadesan
Published: January 2023

In power transmission network state estimation is more complex and the measurements are critical in nature. Estimation of power flow parameters such as voltage magnitude and phasor angle in a power system is challenging when the loads are varying. The objective of the work is to estimate the voltage magnitude and phase angle using machine learning techniques. Some of the Machine learning techniques are decision trees (DT), support vector machines (SVM), ensemble boost (E-Boost), ensemble bags (E-bag), and artificial neural networks (ANN) are proposed in this work. Among these methods, the best machine learning techniques are selected for this study based on performance metrics. Performance metrics are Mean Square Error (MSE), Mean Absolute Error (MAE), and Root Mean Square Error (RMSE). Neural network produces minimum error when compared to other ML Techniques. Among three Performance Metrics MSE provides minimum error and is used to predict the exact model in this work. Therefore, it is concluded that the neural network can predict voltage and angle accurately under various load conditions in the power system effectively. Neural Network (NN) is applied to different load condition, and performance metrics are computed. To validate the proposed work, IEEE 14 and IEEE 30 bus systems are considered. The predicted value is compared to the actual value for all the load variation and residues are measured. The regression learner software in MATLAB is used to implement ML approaches in this work. The Outcome of this proposed work is used in phasor measurement units. The predicted value of voltage and angle using a neural network can be used to minimize the voltage magnitude and phase angle error in phasor Measurement Units (PMU).
Lotka-Volterra Model with Periodic Harvesting
Authors: Muhtar Norma , Cahyono Edi , Iswandi R. Marsuki , Muhidin Muhidin
Published: January 2023

A closed interaction of predator prey is considered. The interaction is expressed in the Lotka-Volterra model. Two types of Lotka-Volterra models are considered, with and without carrying capacity of the prey. The paper includes a periodic harvesting of predator and/or prey, a function of time which acts to the model. Hence, the model is in the form of a system of non-homogeneous equations. Dynamical properties of the models are investigated. The solutions are computed numerically. Such interaction is in the need of integrated farming on harvesting of predator and/or prey. In this model the number of population in the system is sensitive to the initial value, which can be applied to the integrated farming systems such that the system remains sustainable.