bluuebunny/crossref_metadata_2025 huggingface dataset:
Juego de ajedrez en espacios no convencionales y desarrollo de habilidades matemáticas en estudiantes universitarios
Authors: Huauya Quispe Pedro
Published: February 2021

El propósito de la presente investigación fue analizar las infuencias del juego de ajedrez en espacios no convencionales en el desarrollo de las habilidades matemáticas de los estudiantes de la serie 100 de la Escuela Profesional de Economía de la Universidad Nacional de San Cristóbal de Huamanga. Nivel de investigación explicativa experimental de diseño cuasiexperimental; la muestra constituyó 28 estudiantes cada uno del grupo control y experimental, los datos fueron recolectados a través de técnicas de observación, prueba escrita y la entrevista; se aplicó la prueba de T de Student para muestras independiente con un nivel de confianza al 95%. Concluyéndose que el juego de ajedrez en espacios no convencionales infuye significativamente en el desarrollo de las habilidades matemáticas en los estudiantes universitarios; el juego de ajedrez mejoró significativamente la acción de la memoria, concentración, comprensión, pensamiento lógico, imaginación creatividad, agilidad en las operaciones matemáticas, autonomía y motivación personal.
Estudio comparativo sobre la competencia comunicativa en niños bilingües de la zona altoandina del distrito de Huanta
Authors: Quispe Morales Rolando Alfredo
Published: February 2021

La investigación se realizó teniendo como objetivo conocer la diferencia que existe en la competencia comunicativa en lengua quechua y castellana en estudiantes de instituciones educativas bilingües en la zona altoandina del distrito de Huanta. Se plasmó en un tipo de investigación descriptiva y diseño comparativo, en el que utilizó como instrumento la ficha de observación para la recopilación de la información. Asimismo, la investigación se realizó en una muestra de 40 estudiantes del sexto grado de educación primaria. El estadígrafo utilizado para la comprobación de la hipótesis fue U de Mann Whitney debido a que los datos obtenidos no presentan una distribución normal y se encuentran en una escala ordinal. Los resultados obtenidos permiten concluir que existen diferencias significativas en la competencia comunicativa en la lengua quechua y castellana en estudiantes de instituciones educativas bilingües de la zona altoandina del distrito de Huanta.
Escritura de monografías de los estudiantes de la Universidad Nacional de San Cristóbal de Huamanga
Authors: Morales Gutiérrez Fredy
Published: February 2021

El trabajo titulado Escritura de monografías de los estudiantes de la Facultad de Ciencias de la Educación de la Universidad Nacional de San Cristóbal de Huamanga se realizó con el objetivo de reflexionar de manera crítica sobre la escritura de monografías en un contexto donde es importante desarrollar habilidades para la transmisión de conocimientos en el plano escrito de la lengua. Esta práctica de la escritura debe circunscribirse a los estándares internacionales, que permitan el desarrollo de la escritura como medio de transmisión de conocimientos, de acuerdo a las referencias y normas internacionales, que orienten los trabajos de las monografías, con la debida autenticidad y originalidad. Entre los materiales y métodos que se emplearon fueron el método cualitativo, a través de las técnicas del fichaje y el análisis del contenido de las lecturas y del contenido, mediante el diseño de investigación holístico-transdisciplinar. Los resultados a los que arribamos destacan que los estudiantes aún no manejan adecuadamente, tanto la forma ni el contenido en la redacción de las monografías, así como tampoco utilizan adecuadamente todavía las referencias bibliográficas, tanto al interior del trabajo como en las referencias finales. Las conclusiones del trabajo destacan que en la Facultad de Ciencias de la Educación se debe trabajar en forma sistemática entre los profesores que desarrollan cursos de redacción científica.
Estrategias lúdicas y creación literaria
Authors: Quispe Torres Leoncio Daniel , Huayllasco Marquina Patricia
Published: February 2021

La investigación titulada “Estrategias lúdicas y creación literaria” es una aproximación a la resolución de problemas como ¿cómo influye la aplicación de las estrategias lúdicas en la creación de textos literarios en los alumnos universitarios de la UNSCH de Ayacucho, 2015? El objetivo consiste en Determinar la naturaleza de la influencia de la aplicación de las estrategias lúdicas en la creación de textos literarios. El tipo de investigación es la básica y cualitativa. Pues se trata de proponer un modelo de enseñanza. El nivel corresponde al descriptivoexplicativo. El método que se aplica es el mixto inductivo-deductivo. El principal resultado y conclusión arribada es: La aplicación de estrategias lúdicas para la creación de textos literarios influye de manera directa, natural, espontánea y sistemática en la concepción escritural de textos literarios.
Estrategias pedagógicas para desarrollar la capacidad de expresión oral
Authors: Saras Zapata Édgar
Published: February 2021

El objetivo del presente estudio fue determinar el grado de influencia de la aplicación de estrategias pedagógicas en el nivel de expresión oral en los estudiantes de los Planteles de Aplicación “Guamán Poma de Ayala”. Sobre la base de la sistematización del acervo teórico conceptual, análisis, reflexión y contrastación permanente con los datos del diagnóstico sostengo la propuesta de estrategias pedagógicas para el desarrollo de la capacidad de expresión oral. El tipo de investigación es experimental. El diseño es cuasiexperimental (la información fue recolectada a través de una evaluación de entrada y de salida); el nivel es explicativo (se comprendió el porqué del bajo nivel de expresión oral y en qué condiciones se produce). Finalmente, se determinó conclusiones importantes. Los resultados son los siguientes: según la evaluación de entrada, respecto a la expresión oral, el porcentaje de alumnos que se encontraban en inicio es el 31% en el grupo experimental y 45% en el grupo control; aquellos que se ubicaron en proceso, en el grupo experimental fue 44% y en el grupo control 48%. Los estudiantes que evidenciaron logro destacado en el grupo experimental fue el 15% y en el grupo control 7%. Según la evaluación de salida, el 80%(24) del grupo experimental mostraron logro destacado, y en el grupo control el 20%(6). En proceso, se ubicaron el 13%(3) de alumnos del grupo experimental; mientras que en el grupo  control el porcentaje es de 57%(17). En inicio se ubicó el 7%(2) de alumnos del grupo experimental, a diferencia del grupo control que viene a ser 23%(6).
Emplazamientos iniciales, expansión y convergencia del quechua, aimara y puquina
Authors: Calsín Vilca David Peter
Published: February 2021

El pasado histórico de las lenguas mayores del antiguo Perú, principalmente de las lenguas andinas, sigue en constante discusión, a pesar de tener un arraigo académico que se remonta con más énfasis a mediados del siglo pasado. Los encuentros académicos de Cambritge (2008), Lima (2009) y Leipzing (2011) expresan su preocupación en revisar el cuadro interpretativo del desarrollo social y evolutivo de la realidad lingüística andina; razón por la cual, ofrecemos algunos trabajos al respecto.
Sliding mode control of a Five-Phase Series- Connected Two-Motor Drive
Authors: NEZLI Lazhari , Zouaid Omar
Published: February 2021

In this work, we study vector control and sliding mode control of series-connected five-phase two asynchronous machines supplied with a three levels inverter. After presentation of multiphase machines, we worked out the mathematical model of five phase asynchronous machine supplied with voltage inverter. Application of Park transformation reduces considerably the mathematical model of machine. After, we applied vector control and sliding mode control to the five-phase induction machine. After that, we study a multi-machine system which comport five-phase two asynchronous machines supplied with a single voltage inverter. In the last, we had the independent vector control and the sliding mode control of series-connected five-phase two asynchronous machines. We observe that an appropriate transposition of phase’s order permits an independent control of two machines.
Design and Evaluation of a DSP Based Differential Relay of Power Transformer
Authors: ABDELMOUMENE Abdelkader , BOUDERBALA Rachid , BENTARZI Hamid
Published: February 2021

The problem of mal operation of differential protection of power transformer due to the inrush magnetizing current has long considered as a challenging problem. Several types of protection relays have been used to solve the issue (basic relay, percentage relay, multi slop ….). Each of them has its advantage and its limits. In this paper, a Digital differential relay has been developed and simulated. The logic used to distinguish between the inrush current and the internal fault is based on the theory of harmonic analysis. The behavior of the presented relay has been simulated versus various situations (inrush current, internal fault and external fault). The obtained results show that the proposed algorithm provides a good discrimination and a fast action.
Describing the steganalysis tool: BBD15 “OurSecret detector”
Authors: Leila BENAROUS , Mohamed DJOUDI , Ahmed BOURIDANE
Published: February 2021

Digital steganography is the art of hiding secret messages and data in innocent cover, most likely in images and videos. Images and videos offer the best cover files for steganography with their high capacity, by being innocent and for being easily exchanged without raising the suspicions of a third party. A lot are the free tools that embeds data in images and videos, among which is OurSecret. In this paper we aim to detect the stego images and videos created by OurSecret by developing a steganalysis tool BBD15.
Quality of energy resulting from association converter- machine for the electric drive of a system of wind generation
Authors: Aggoun Ghania , Boubouzel Naima , Kachenoura Rahma , Fellag Sid Ali
Published: February 2021

The work presented in this paper concerns, the quality of energy negated with wind power system, we were interested initially to impact of the choice of the type of PWM control of the converters on the output quality of energy and we were interested to the feeding and controls of doubly fed induction generator (DFIG) and the contribution which it will be able to carry its application in a wind chain conversion. The modeling of DFIG was presented, thus we applied the vector control in active and reactive generator power. Then we are interested in cascades based on a DFIG and back-to-back converter. The results obtained with simulation allowed the performance evaluation of the application of the asynchronous machine double power supply in the wind field.
Analysis Study of Radar Probability of Detection for Fluctuating and Non-fluctuating Targets
Authors: AOUNALLAH Naceur , KHALFA Ali
Published: February 2021

The radar analyst can develop and use mathematical and statistical techniques that lead to accurate prediction or adapting models for estimating the target detection performance. In radar detection theory, detection probability, false alarm probability, number of samples non-coherently integrated for a detection test, and signal-to-noise ratio (SNR) are closely interrelated. The present paper is intended to provide an overview of the calculations of radar probability of detection and its related parameters. The main methods and procedures for predicting the detection performance of either non-fluctuating or fluctuating targets are described. Performance’s analysis of the studied models is included, along with some graphical simulation examples.
Modeling and Diagnostic of Permanent Magnet Synchronous Machine under Insulation Failure Condition
Authors: CHOUROUK BOUCHAREB , MOHAMED-SAID NAIT-SAID , FETHI LAHMER
Published: February 2021

One of the most frequent faults in PMSM stator is the turn-to-turn short-circuit fault. So, the aim of this paper is to present a dynamic model for PMSM with turn-to-turn short-circuit fault based on equivalent electric circuit model. Two simple and useful diagnostic techniques ESA an EPVA based on frequency analysis are applied to detect this kind of fault. The accuracy of diagnosis is based on adding the real waveform of back-EMF.
Light Flicker Frequencies in the HID lamps
Authors: Amer Lakhdar , Hamouda Messaoud , Benachiba Chellali
Published: February 2021

In order to reduce the electric consumption for high intensity discharge lamps (HID), the use of high frequencies electronic ballasts represents both a solution and many advantages such as, the decrease in the congestion, low costs and weak losses, approximately 10%. However it is not regarded as perfectly reliable, this is due in a great part to the appearance of Acoustic Resonances inside the arc tube which can result in low frequency light flicker and even lamp destruction. Experimentally we used a HID lamp of 50 W and we determined, light flicker frequencies and the arc motion frequencies using a photodiode which detects the light intensity fluctuation and a camera to record the arc motion. The experiment was done in the Department of Mechanical Engineering and Production, Hamburg University of Applied Sciences.
Reliability modelling using Weibull distribution on real-time system in oil drilling installations
Authors: Ben Rahmoune Mohamed , Guemana Mouloud , Hafaifa Ahmed
Published: February 2021

Recently, reliability has become a key parameter of quality and decision support, covering many aspects, such as failure analysis systems. A reliability analysis is essential for the study of operating safety in industrial systems. In this paper, we summarised evaluation methods and real-time reliability analyses. This work proposes solutions to real-time reliability modelling, as applied to an industrial pump. The model will be used to increase the lifespan of the equipment, to help develop suitable maintenance plans and to assign a probability to good operating system examined to choose the best dedicated industrial pump technology solutions
Control Of Mobile Robot Navigation Under The Virtual World Matlab-Gazebo
Authors: BENSACI Chaima , ZENNIR Youcef , POMORSKI Denis
Published: February 2021

In this paper, we present our navigation control approach of a mobile robot (Turtlebot 2 robot) based on the stability Lyapunov function; our mobile robot is composed of two differential wheels. The kinematic model of the robot is presented followed by the description of the control approach. A 3D simulation under the Gazebo software is developed in interaction with the kinematic model and the control approach under MATLAB-SIMULINK software. The purpose of this study is to carry out an autonomous navigation; we initially planned different trajectories then we tried to be followed them by the robot. Our navigation strategy based on its odometry information, based on robot position and orientation errors; Velocity commands are sent for the robot to follow the chosen path. Different simulations were performed in 2D and 3D and the results obtained are presented followed by the envisaged future work.
Robust Fuzzy Path Tracking Control of a Platooning Vehicles
Authors: ALLOU Sami , ZENNIR Youcef
Published: February 2021

The paper present our control approach based in fuzzy controller for platooning vehicles. this approach based to control lateral and longitudinal movement of vehicles in different navigation trajectory. kinematic model of vehicles are described follows by describe of controller design. The communication is provided between vehicles with exchange information, speed and orientation angle with a fixed safety distance between vehicles. 3D simulation developed with matlab, Simulink and v-rep software were carried . Different reference trajectory are used to compared and approve our approach. The simulation results illustrate the efficiency of our control design and open the perspectives for future work.
Analysing Primary Signal Sensing Test in Cognitive Radio Networks Using an Alpha-Beta Filter and a Neyman-Pearson Detector
Authors: Adardour Haroun Errachid , Kameche Samir
Published: February 2021

The signal strength sensing in the context of cognitive radio networks (CRNs), is very important to predict the primary signal of base station (PBS), particularly when the secondary user (SU) is in a congested environment, and also when is in motion towards the end of coverage of PBS. However, this article presents an analysis on the prediction of primary signal strength in CRNs using an Alpha-Beta Filter (ABF) and a Neyman-Pearson Detector (NPD). The challenge of this contribution is based on a realistic sensing of primary signal strength and to do that, we have assumed that the reporting channels between the SU and the PBS are composited with the shadowing and multipath fading (SMF), and the receiver noise has also added. In this regard, the obtained results were discussed through: the signal-to-noise ratio (SNR) uncertainty, the detection probability (PD) and the False Alarm Probability (PFA), where the average relative error of prediction for the PD will be equal to10-5.
Nonlinear Backstepping Control of Permanent Magnet Synchronous Motor with Rotor Speed and Position Estimation
Authors: KIRAD Abderrahmen , Grouni Said , MECHALI Omar
Published: February 2021

This paper presents a nonlinear backstepping control strategy used to ensure good dynamic behavior, high performance and the stability of the permanent magnet synchronous motor (PMSM). However, this control requires the precise knowledge of certain variables (speed, torque and position) that are difficult to access or sensors require additional mounting space, reduce reliability, increase the cost of the engine, and make maintenance difficult. Thus, an Extended Kalman Filter (EKF) approach is proposed for the estimation of speed and rotor position in the PMSM. The interesting simulation results obtained which are subjected to the load perturbation show very well the efficiency and the good performance of the nonlinear feedback control proposed and simulated in Matlab-Simulink.
Diagnosis of the Induction Machine Using Advanced Signal Processing Methods
Authors: CHAHMI Abdelghani
Published: February 2021

This work is a part of the thematic of monitoring and fault diagnosis of the squirrel cage three-phase induction machine. The choice of this type of machine is justified by the growing success it has exhibited, mainly, in the electric drives with variable speed. Signal based detection methods are presented is validated in simulation. The proposed diagnosis approach requires only little experimental data, and more importantly it provides efficient simulation tools that allow characterizing faulty behavior.In this study, the proposed approach considers the value of rotor resistance as fixed for condition monitoring. This value in the diagnostic tools which one uses is not fixed contrary to the classical approaches of control of machine.
Remaining useful life prediction of cutting tools using wavelet packet transform and extreme learning machine
Authors: Laddada S. , Benkedjouh T. , Si- Chaib M. O. , DRAI R.
Published: February 2021

Online tool wear prediction is a determining factor to the success of smart manufacturing operations. The implementation of sensors based Prognostic and Health Management (PHM) system plays an important role in estimating Remaining Useful Life (RUL) of cutting tools and optimizing the usage of Computer Numerically Controlled (CNC) machines. The present paper deals with health assessment and RUL estimation of the cutting tool machines based on Wavelet Packet Transform (WPT) and Extreme Learning Machine (ELM). This approach is done in two phases: a learning (offline) phase and a testing (online) phase. During the first phase, the WPT is used to extract the relevant features of raw data computed in the form of nodes energy. The extracted features are then fed to the learning algorithm ELM in order to build an offline model. In the online phase, the constructed model is exploited for assessing and predicting the RUL of cutting tool. The main idea is that ELM involves nonlinear regression in a high dimensional feature space for mapping the input data via a nonlinear function to build a prognostics model. The method was applied to real world data gathered during several cuts of a milling CNC tool. The performance of the proposed method is evaluated through the accuracy metric. Results showed the significance performances achieved by the WPT and ELM for early detection and accurate prediction of the monitored cutting tools.
Analog Filter Design: A Succinct Investigation
Authors: RECIOUI Abdelmadjid , HAMRIOUI Fatma Zohra , BENAMROUCHE Kenza , MERABET Oussama
Published: February 2021

In many systems, it is essential to extract or enhance the desired information and remove the unwanted components. This is the simplest aim of signal processing where the filter turns out to be the key element. The objective of this paper is to investigate the characteristics of analog passive and active filters. Particularly, the interest goes to the conventional Butterworth, Chebychev and Bessel filter. A comparative study of these filters is done. The different circuits are simulated using the MULTISIM software to visualize the magnitude and phase responses. The procedure of designing the different filters is presented so that it can be used in any application.
Mathematical Method for Parameters Calculation of electric Characteristic of Photovoltaic Module
Authors: Benabdelkrim B. , Benatillah A.
Published: February 2021

The study of photovoltaic systems (PV) in an efficient manner requires a precise knowledge of the I-V characteristic curves of PV modules. An accurate current-voltage (I-V) model of PV modules is inherently implicit and non-linear and calls for iterative computations to obtain an analytical expression of current as a function of voltage. In this paper, numerical approaches are proposed to forecast the PV modules performance for engineering applications. The proposed approaches were implemented in a Matlab script and the results have been compared with the datasheet values provided by manufacturers in standard test conditions (STC). These approaches permit to extract the unknown parameters and also allow quantifying the effects of module temperature and irradiance on key cells parameters. In this work, a comparative study of the performance characteristics for different modules thin films and solid is analyzed by a single-diode equivalent circuit using four- and five-parameter models and two diode model.
Application of the Unit Circle Representation to Pattern Synthesis of Nonuniformly Spaced and Nonuniformly Excited Arrays based on the Teaching Learning Based Optimization
Authors: RECIOUI Abdelmadjid
Published: February 2021

Pattern synthesis of Antenna array has gained much attention over the last years as they constitute an important role in the modern communication systems. Unit circle-based techniques such as Schelkunoff null placement method have proved their effectiveness to synthesize uniformly spaced linear arrays. Nonuniformly spaced antenna array pattern synthesis has been investigated and interesting results have been obtained. In this work, the unit circle representation approach is applied to synthesize nonuniformly spaced and nonuniformly excited linear arrays. The objective is to accurately place nulls in the desired directions while achieving the least possible sidelobe level. The problem is cast as an optimization problem that is solved using the Teaching Learning Based Optimization (TLBO). Examples are dealt with to prove the design approach effectiveness and flexibility for modern communication system applications.
3D Antenna Array Design using Firefly Optimization Algorithm
Authors: RECIOUI Abdelmadjid , GRAINAT Youcef
Published: February 2021

The design of antenna arrays in a 3D geometry is presented in this Chapter. The decision variables considered for this synthesis problem are the array element amplitude excitations. The objective is to design an array which ensures minimum sidelobe level and a high directivity. The synthesis process is carried out using a nature-inspired global optimization technique. The optimization method based on the reaction of a firefly to the light of other fireflies is known as Firefly Algorithm (FA). It is a population-based iterative heuristic global optimization algorithm technique, developed by Xin-She Yang, for multi-dimensional and multi-modal problems. Simulation results for an antenna array with isotropic elements show that side lobe level is significantly reduced in non-uniform case. Besides, the directivity is not worse than that of the uniform one.
Predictive Maintenance Applied to Three phase Induction Motors
Authors: DEKHANDJI Fatma Zohra , HALLEDJ Salah Eddine , ZABOUB Oussama
Published: February 2021

Induction machines are widely used in industry. The operating conditions may sometimes lead the machine into different fault situations. The machine should be shut down when a fault is experienced to avoid complete process failure and for the safety of the workers. The predictive maintenance consists of scheduling maintenance activities only when a functional failure is detected. The advantages of predictive maintenance are accepted in many industries because of its efficiency in fault detection during early stages and thus reducing unscheduled down time. It increases productivity, improves quality and provides the feeling of safety and reliability to staff. The main types of external faults experienced by these motors are over loading; single phasing, unbalanced supply voltage, phase reversal, ground fault, under voltage and over voltage. MATLAB/SIMULINK simulation is used in this work for the detection and analysis of the faults on induction motor.
Efficient lock and home security system
Authors: BELAIDI Hadjira , MEDDAH Nour-El-Houda
Published: February 2021

This work deals with lock and home security systems. First, Motion sensors detect movement indoors and outdoors to guard against intruders, protect valuables and more. Thus, if any movement, RFID reader will be activated and database will be scanned to identify the persons who have the access to the home. This enhances the effectiveness of the security system and provides the user with the complete, whole-house protection he needs. An RFID badge can be used to unlock the door and access to the home. Alerts also are received on the smart phone if motion is sensed in a protected area inside or outside; giving the user the information it needs to act quickly. The door can also be remotely locked/unlocked. A microcontroller (ATmega2560) is used to control the entire system, and GSM is used to send alerts to the Smartphone. An Ethernet shield that connects the microcontroller to the database (DB) is also added.
Design of Decentralized Fractional Order PIʎ Controller for Pilot Plant Binary Didtillation Column
Authors: BETTOU KHALFA , CHAREF ABDELFATEH
Published: February 2021

This paper presents the application of fractional order operators to improve the control quality of multivariable systems. The basic ideas of this tuning method are based, in the first place, on the existed tuning methods for setting the parameters of the decentralized fractional order PIʎ controller for ʎ=1, which means setting the parameters of the classical decentralized PI controller, and the minimum integral criterion by using Particle Swarm Optimization (PSO) algorithm for setting the fractional integration action order ʎ. The integral criterion is formulated to improve the dynamic response of the system, while causing a good decoupling between control loops. The Distillation Column, which is a multivariable system with two inputs and two outputs (TITO), in a decentralized control structure, is analyzed. Simulation results are presented to show the control quality improvement of this proposed decentralized fractional order PIʎ controller tuning method compared to the decentralized PI controller tuned using any existed tuning method.
Robust MRAC-based adaptive control of a Doubly Fed Induction Generator (DFIG) in a Wind energy system using a fractional order Integrator
Authors: Djebbri Sihem , Balaska Hanane , LADACI Samir
Published: February 2021

This paper presents a robust control of doubly fed induction generator for wind generation system. The whole system is presented in d-q-synchronous reference frame. We propose the implementation of adaptive control with integer model reference MRAC, fractional model reference FOMRAC with integer and fractional order control law design for active and reactive power supervision control in the doubly fed induction generator (DFIG) for wind energy systems. The objective is to realize a comparative study between the classical regulator MRAC and the proposed FO-MRAC with integer and fractional order control law in order to demonstrate the robustness of the fractional order adaptive control with fractional order integral in control law comparatively to integer order one. Performance and robustness results obtained will be presented and analyzed.
Integrated RMA with FMECA analysis using a graphical inteface: case study recycling iso-butane pump (CP2K)
Authors: MECHHOUD El-Arkam , BENDIB Riad , ZENNIR Youcef
Published: February 2021

The objective of our work is the implementation of a new approach for the dependability enhancement of a recycling iso-butane pump (Skikda CP2K petrochemical plant) based on automateddependability analysis system including the automation of the RMA (Reliability, Maintainability, Availability) study and FMECA (Failure Mode Effect and Criticality Analysis) method. After the system description, we present briefly the principle of the automated method. The system analysis in degraded mode is realized by using FMECA method. This automated analysis brings out the different failure modes, their causes and their consequences of each component. The result is risks minimization and reliability enhancement of the considered system.
Novel Fractional order Integrators Using Traditional Rules Interpolation
Authors: MEKHNACHE Chafia , BALASKA Nawel , DETOUCHE Nedjma
Published: February 2021

This work proposes a new IIR integer order digital, so a new IIR fractional order integrators. The followed method includes two stages. First, the integer order integrator is obtained by interpolating well-known integration rulesnamely, Euler, bilinear and Simpsonas a weighted sum. Second the initial value theorem for the selection of initial value of the impulse response is used. Lastlythe Steiglitz-Mc-bride signal modeling technique is applied to find the parameters of rational approximation models. Numerical examples are presented to illustrate the performance of the proposed integrator. It was found that the Euler-bilinear-Simpson integrator yields high accuracy than the existing integrators.
Straddle Robot Design and control with a PID controller optimized by PSO algorithms
Authors: ZENNIR Youcef , GRIEF Sami , MECHHOUD Elarkam
Published: February 2021

The work presented in this paper illustrates the design and control of a straddle robot-type four-wheel moving robot with PID controller adjusted by meta-genetic algorithms genetic Algorithm (GA) and PSO. The approach used for the simulation is a modeless approach because it assumes no knowledge of the mathematical model of the system, indeed, the mechanical structure was implemented under SolidWorks, then a simulation (Solidworks, Simulink) has was conducted using particle swarm optimization (PSO) techniques for controller parameter optimization (PID) to control the steering angle and angular velocity of each wheel. The results obtained clearly illustrate the effectiveness of the selected control architecture and the accuracy is better with the use of the PSO algorithm. In a future work, we compare the results with using other optimization algorithms like GA (Genetic Algorithm) and GWO (Grey Wolf Optimizer) algorithm.
Three-Dimensional Pulse Width Modulation Techniques for Three-Phase Four Leg Voltage Source Converters
Authors: ELBAR Mohamed , MERZOUK Imad , REZAOUI Mohamed Mounir , BESSOUS Noureddine
Published: February 2021

This paper presents a new control strategy to improve the performance of shunt active power filter (SAPF) in three-phase four-wire system when operating under an unbalanced system. A control method based on the instantaneous power theory have been used and discussed. On the other side, a three-dimensional hysteresis current controller is used to track the compensated current references. This scheme requires the service of a phased-locked loop (PLL) to make the system insensitive to the distortions that are generally present in the utility voltages. The performance of the proposed topology under the used control approach has been finally discussed through the obtained simulation results.
Improvements in the performance of an SIS by bypass reduction on the safety functions
Authors: Sklab Ramdane , ZENNIR Youcef , BENDIB Riad
Published: February 2021

In order to maintain the integrity of its installation, the BIR EL MSANA (BMS) oil company has equipped itself with a safety instrumented system (SIS), complying with IEC 61508 and IEC 61511 standards. Whereas some constitutive functions of this system are disabled and not available, this means that the installations remains unprotected for a significant period of time, hence the obligation to look for adequate and permanent solutions. Through this work, we clarify the causes that led to this deactivation, proposing effective solutions for each case, this will allow reactivating them and ensuring a safe and sustainable exploitation.
ANALISIS PENGARUH NILAI TUKAR DAN INFLASI TERHADAP NERACA PERDAGANGAN DI INDONESIA 2008 – 2018
Authors: Sitompul Nancy , Siahaan Maria
Published: February 2021

Indonesia’s trade balance records the export and import of goods carried out by the Indonesian State. Indonesian trade balance movement. The trade balance can be called net exports. The results of this study can rate index have also be seen that inflation and the exchange rate index have a significant impact on changesin the trade balance for 2008 to 2018. The appreciated Rupiah (an increase in the value of the currency) will have an impact on the competitiveness of domestic goods on the international market so that the balance sheet have improved. Meanwhile, if there is an increase in the inflation rate, it indicates the value of domestic commodity prices and exporters’interest in domestic goods will decline, so this will cause exports to fall and will later have an impact on the surplus of the balance sheet.
Un análisis longitudinal de los masters propios especializados en Relaciones Públicas y en Comunicación Corporativa en España en el curso académico 2018-19
Authors: Compte-Pujol Marc , Matilla Kathy , Cuenca-Fontbona Joan
Published: February 2021

El objetivo de esta investigación es doble: (1) identificar y compilar los masters no oficiales (propios) especializados en comunicación, relaciones públicas y comunicación corporativa del sistema universitario español en el curso 2018-2019 y (2) identificar, compilar y analizar los específicos en relaciones públicas y comunicación corporativa. Mediante un muestreo no probabilístico por propósito en base al universo de titulaciones de masters propios presentes en el buscador web del Ministerio de Educación, Cultura y Deporte se identificaron y listaron la totalidad de las universidades del sistema universitario español y, posteriormente, se analizaron individualmente las websites de todas y cada una de ellas, identificando y listando aquellas que ofertaban titulaciones de los masters propios objeto de estudio. Tras depurar la primera muestra de 85 masters propios ofertados por 32 universidades españolas, y mediante análisis de contenidos, se identificaron un total de 42 masters no oficiales que cumplían los requisitos de búsqueda en el curso 2018-2019, de los cuales 12 están directamente vinculados a la función de dirección de comunicación.
Engagement y redes sociales. Análisis bibliométrico desde el ámbito científico de las relaciones públicas
Authors: Moreno Ángeles , Fuentes Lara Cristina
Published: February 2021

Uno de los aspectos de mayor influencia de las redes sociales es el engagement de los stakeholders, mediante el cual una empresa puede conversar con sus grupos de interés. El objetivo del presente trabajo es realizar un análisis bibliométrico que permita identificar la importancia y la evolución del engagement en redes sociales en el ámbito de las empresas dentro de la literatura especializada en Relaciones Públicas y Gestión de Comunicación. Un análisis de contenido cuantitativo bibliométrico nos ha permitido evaluar la actividad y la producción científica de las publicaciones que aparecen en las revistas académicas con mejor posición en JCR y Scopus en el ámbito de gestión de las Relaciones Públicas en el período comprendido entre 2010 y 2017.Para el análisis se han incluido indicadores de producción, dispersión, colaboración, literatura científica, rigurosidad empírica y asociaciones temáticas. Los resultados evidencian un crecimiento gradual durante los años de estudio de la productividad científica sobre la temática objeto de este estudio, de acuerdo con los indicadores de dispersión. Se han detectado diez categorías temáticas principales y algunas tendencias en cuanto a la autoría y el uso de referencias. Tras analizar todos los datos queda patente la importancia que adquiere el engagement en redes sociales en el ámbito de las Relaciones Públicas. Es especialmente notable el número de artículos referentes al análisis de la Responsabilidad Social Corporativa, la comunicación de crisis, la legitimidad o la reputación, debido al creciente interés que tienen las empresas en mejorar y profundizar en la relación que mantienen con sus públicos.
PERANCANGAN MODEL INTEGRASI PBSC DAN OBSC UNTUK MENENTUKAN PRIORITAS TINDAKAN PERBAIKAN PADA BANK ANZ INDONESIA DIVISI SALES COMMERCIAL BANKING
Authors: FARIZ FARIZ , WINARSIH TUTIK
Published: February 2021

Setiap perusahaan akan dengan mudah memperoleh sumberdaya yang diinginkan kapan dan dimanapun sumberdaya tersebut tersedia dengan perbaikan kinerja pribadi dan organisasi secara berkelanjutan dimana penerapan Total Performance Scorecard (TPS) melalui PBSC serta OBSC dapat dijadikan sebagai senjata utama bagi Bank ANZ Indonesia Divisi Sales Commercial Banking.Tujuan penelitiannya adalah perancangan model integrasi PBSC dan OBSC untuk menentukan prioritas tindakan perbaikan pada Bank ANZ Indonesia Divisi Sales Commercial Banking dengan penelitian berbentuk Description research dimana memberikan gambaran secara tepat keadaan atas gejala tertentu untuk menentukan adanya hubungan antara suatu gejala dengan gejala yang lain. Perbaikan pribadi karyawan pada perspektif internal yang menjadi prioritas adalah terus melakukan kegiatan, tetapi menetapkan batas waktu secara ketat, sedangkan pada perbaikan Bank ANZ Indonesia secara organisasi dengan perspektif yang sama yang menjadi prioritas adalah mengatur pengembangan organisasi secara lebih efisien.Perbaikan pribadi karyawan pada perspektif ekternal yang menjadi prioritas adalah mengembangkan pengetahuan dalam bidang manajemen khususnya keuangan dan pemasaran,sedangkan pada perbaikan Bank ANZ Indonesia secara organisasi dengan perspektif yang sama menjadi prioritas adalah mengembangkan program untuk pemasaran berorientasi tujuan. Tentunya, hal ini dapat dikatakan bahwa pada perspektif internal terdapat keselarasan.Pada perspektif pengetahuan dan pembelajaran yang menjadi prioritas adalah lebih proaktif, lebih efektif, lebih berfokus pada hasil dan bertindak lebih persuasif, sedangkan pada perbaikan Bank ANZ Indonesia secara organisasi dengan perspektif yang sama menjadi prioritas adalah melakukan wawancara perencanaan, pelatihan dan penilaian dengan karyawan berdasarkan rencana kinerja perorangan dan profil kemampuan. Tentunya, hal ini dapat dikatakan bahwa pada perspektif pengetahuan dan pembelajaran terdapat keselarasan dalam hal pelaksanaan.Pada perspektif keuangan dapat dilihat tindakan perbaikan pribadi karyawan yang menjadi prioritas adalah mencari strategi investasi yang terbukti berhasil, sedangkan pada perbaikan Bank ANZ Indonesia secara organisasi dengan perspektif yang sama menjadi prioritas adalah menutup unit bisnis yang tidak menguntungkan. Tentunya, hal ini dapat dikatakan bahwa pada perspektif keuangan terdapat keselarasan dalam hal pelaksanaan serta tujuan yang ingin hendak dicapai
Covid-19 and Digitalization: Network Analysis On Industrial Robots Trade Among The Bri Countries
Authors: SOYYİĞİT Semanur , EREN Ercan
Published: February 2021

The pandemic indicates that the use of digital technologies is going to become more important hereafter. In such a world where countries need to take action to shape their future in accordance with this ‘new normal’, the policies followed by countries in high technological sectors will be determinative on their positions within global value chains in the future. Based on this, international trade of industrial robots among the Belt and Road Initiative members is analyzed via complex network tools in the present study. The empirical results indicated that the international trade network of industrial robots has complex system properties such as power-law distribution, disassortativity, core-periphery structure etc. The results also revealed that developing members of the Initiative may exploit export hubs of the network, namely South Korea, Singapore, Austria and Italy in order to digitalize their economies in the short-term.
The anti-Müllerian hormone gene's second exon is associated with the reproductive performance of Jinghai Yellow chickens
Authors: Wu Yulin , Shen Manman , Yin Xuemei , Duan Yanjun , Zhang Shanshan , Ding Hao , Chen Lan , Zhang Tao , Zhang Genxi , Wang Jinyu
Published: February 2021

Abstract. Anti-Müllerian hormone (AMH), a member of the transforming growth
factor-β superfamily, plays important regulatory roles in follicular
development and sex differentiation. Although much has been learned about
the impact of polymorphisms of AMH on reproduction in animals, the effect on
chicken reproduction is not well explored. In this study, the polymorphism
of five exons of AMH gene and its effect on the reproductive performance of Jinghai
Yellow chickens were studied. Primers for the amplification of AMH exons were
designed, and Sanger sequencing was performed. Finally, only the polymorphism
in the second exon of the AMH gene was found in the present population. Polymorphisms
in the second exon of the AMH gene in 246 Jinghai Yellow hens and their
associations with reproductive traits were analyzed. In total, four single nucleotide polymorphism (SNP)
mutations were detected in the second exon of the AMH gene: g.1868A>C (AA, aa and Aa); g.1883G>A (BB, bb and Bb);
g.1987G>A (CC, cc and Cc); and g.1996A>G (DD, dd and
Dd). Only the mutation of g.1996A>G affected the reproductive
traits: the age of laying first egg (AFE) of dd genotype was
significantly (p<0.01) earlier than that in the DD and Dd hens. Moreover, the egg
number by 300 d old (EN300) of dd individuals was significantly
higher than that of DD and Dd individuals (p<0.01). Thus, we inferred that the dd
genotype is the beneficial genotype. Additionally, AFE and EN300 showed
significantly better performance in both the H2H2 and H7H7 diplotypes
compared with other diplotype individuals (p<0.01). Thus, the H2H2 and H7H7
genotype had the best combination of AFE and EN300. Our study may allow for
molecular marker section in poultry breeding.
The CO2 integral emission by the megacity of St. Petersburg as
quantified from ground-based FTIR measurements combined with
dispersion modelling
Authors: Ionov Dmitry V. , Makarova Maria V. , Hase Frank , Foka Stefani C. , Kostsov Vladimir S. , Alberti Carlos , Blumenstock Thomas , Warneke Thorsten , Virolainen Yana A.
Published: February 2021

Abstract. The anthropogenic impact is a major factor of the climate change which is highest in industrial regions and modern megacities. Megacities are a significant source of emissions of various substances into the atmosphere, including CO2 which is the most important anthropogenic greenhouse gas. In 2019 and 2020, the mobile experiment EMME (Emission Monitoring Mobile Experiment) was carried out on the territory of St. Petersburg which is the second largest industrial city in Russia with a population of more than 5 million people. In 2020, several measurement data sets were obtained during the lockdown period caused by the COVID-19 (COronaVIrus Disease of 2019) pandemic. One of the goals of EMME was to evaluate the CO2 emission from the St. Petersburg agglomeration. Previously, the CO2 area flux has been obtained from the data of the EMME-2019 experiment using the mass balance approach. The value of the CO2 area flux for St. Petersburg has been estimated as 89±28 kt km−2 yr−1 which is three times higher than the corresponding value reported in the official municipal inventory. The present study is focused on the derivation of the integral CO2 emission from St. Petersburg by coupling the results of the EMME observational campaigns of 2019 and 2020 and the HYSPLIT (HYbrid Single-Particle Lagrangian Integrated Trajectories) model. The ODIAC (Open-source Data Inventory for Anthropogenic CO2) database is used as the source of the a priori information on the CO2 emissions for the territory of St. Petersburg. The most important finding of the present study based on the analysis of two observational campaigns is a significantly higher CO2 emission from the megacity of St. Petersburg as compared to the data of municipal inventory: ~75800±5400 kt yr−1 for 2019, ~68400±7100 kt yr−1 for 2020 (~70000±16000 kt yr−1 during the lockdown) versus ~30000 kt yr−1 reported by official inventory. The comparison of the CO2 emissions obtained during the COVID-19 lockdown period in 2020 to the results obtained during the same period of 2019 demonstrated the decrease in emission of 8 % or 5800 kt yr−1.
Energetic analysis of succinic acid in water droplets: insight into the
size-dependent solubility of atmospheric nanoparticles
Authors: Chen Chuchu , Wang Xiaoxiang , Binder Kurt , Ghahremanpour Mohammad Mehdi , van der Spoel David , Pöschl Ulrich , Su Hang , Cheng Yafang
Published: February 2021

Abstract. Size-dependent solubility is prevalent in atmospheric nanoparticles, but a molecular level understanding is still insufficient, especially for organic compounds. Here, we performed molecular dynamics simulations to investigate the size dependence of succinic acid solvation on the scale of ~1–4 nm with the potential of mean forces method. Our analyses reveal that the surface preference of succinic acid is stronger for a droplet than the slab of the same size, and the surface propensity is enhanced due to the curvature effect as the droplet becomes smaller. Energetic analyses show that such surface preference is primarily an enthalpic effect in both systems, while the entropic effect further enhances the surface propensity in droplets. On the other hand, with decreasing droplet size, the solubility of succinic acid in the internal bulk volume may decrease, imposing an opposite effect on the size dependence of solubility as compared with the enhanced surface propensity. Meanwhile, structural analyses, however, show that the surface to internal bulk volume ratio increases drastically, especially when considering the surface in respect to succinic acid, e.g., for droplet with radius of 1 nm, the internal bulk volume would be already close to zero for the succinic acid molecule.