bluuebunny/crossref_metadata_2025 huggingface dataset:
¿Cómo el Ciberdelito afecta a las Empresas e Instituciones Bancarias en Panamá?
Authors: Martínez Yarnelys , Cerezo Jislaine , Quirós Anabelis
Published: June 2024

El Ciberdelito es un tipo de delito que se comete en el ámbito digital, a través de medios electrónicos, como internet en páginas web. Consiste en actividades ilegales realizadas con el objetivo de obtener información confidencial, causar daño y cometer fraudes; y el impacto que tiene a nivel mundial es significativo. Por ello, en esta investigación se analizó el impacto negativo que tiene el ciberdelito en las empresas, personas e instituciones a nivel general. También se indagó en por qué sucede esto, y cómo se ha visto afectado nuestro país “Panamá” por este delito. Se conoció más sobre los tipos de ciberdelitos que afectan a las instituciones bancarias y empresas en Panamá, y las medidas que se han implementado para prevenir este tipo de delitos. Para la realización de esta investigación se procedió a utilizar varios elementos: Se consultó libros y artículos científicos, además de páginas web. Los hallazgos más relevantes fueron que las consecuencias que tiene el ciberdelito en las empresas son desastrosas; hay pérdidas económicas directas debido al robo de datos financieros, ya que su restablecimiento y recuperación de los sistemas pueden requerir una inversión significativa. Imagine “La delincuencia informática mundial tiene un costo de 114 mil millones de dólares anuales”. Así que, podemos ver la importancia de que Panamá implemente medidas de seguridad, haga cambios en el Código Penal y adopte prácticas avanzas de ciberseguridad para que así de esta manera se pueda enfrentar a la sofisticación de los ciberdelincuentes.
Thermal and luminic comfort assessment in university classrooms in Tijuana, Baja California. Case of study FCITEC, Valle de las Palmas
Authors: De la Cruz Chaidez María Teresa , Armendáriz López José Francisco , Martín del Campo Saray Francisco José , Sahagún Valenzuela Miguel Isaac , Castañón Bautista María Cristina , García Gómez Carmen
Published: June 2024

About 2022, studies on environmental conditions inside classrooms have increased because they are related to well-being, performance, and student productivity in terms of concentration, attention, and learning during school hours. Assessing the conditions of the educational space once inhabited can be fundamental to identifying environmental adjustments that could improve achievement in learning through design strategies in school facilities in the locality. The evaluation of the thermal and luminic conditions of three classrooms designed to function with natural ventilation, in two buildings of the Universidad Autónoma of Baja California, in Tijuana, Mexico, during the cold-warm transition period is presented. Physical measurements of environmental indicators were made, including temperature, relative humidity, and daylight. A total of 181 students completed the environmental survey questionnaires. This study aimed to evaluate the interior environmental space conditions and determine the influence on occupants' comfort. Results showed that more than 50% of the students were in a thermal discomfort situation when the temperature was out of the range of 19.7°C -27.7° C, consistent with the application of the ASHRAE Adaptative Comfort Zones. Daylight values were below the minimum required of 300 Lux for educational classroom specificity in [1, 2] of the three classrooms. Building's orientations, West and South registered illuminance values that could produce glare and increase thermal discomfort due to high solar radiation. The results confirmed the close relationship between environmental conditions and students' comfort in classrooms.
Herramientas y técnicas modernas de protección contra incendios. Una Revisión Bibliográfica actualizada
Authors: Medina Pérez Víctor Hugo , Medina Gavidia Erika Patricia
Published: June 2024

Uno de los aspectos más importantes referentes a la prevención de incendios es la detección oportuna y temprana de los mismos. La implementación de sistemas modernos de extinción de incendios requiere capacitación y simulacros avanzados, pues de nada sirve contar con la mejor tecnología, si el personal no sabe cómo emplearlos y el beneficio que estos aportan en la prevención de incendios, pues conocer el funcionamiento y realizar simulacros avanzados permiten poner a prueba los protocolos establecidos dentro de las organizaciones, evaluar la eficacia de las medidas preventivas y garantizar una respuesta coordinada en caso de emergencia. En consideración a lo expuesto, el objetivo de este trabajo fue proporcionar una descripción general de las herramientas y técnicas de última generación utilizadas en los sistemas de protección contra incendios mediante una revisión bibliográfica actualizada. Con base en la información consultada, es evidente que las herramientas y técnicas modernas de protección contra incendios incluyen una amplia variedad de dispositivos diseñados para reducir la propagación del fuego, garantizar la seguridad de la población y las estructuras involucradas en el flagelo. Así, gracias a los avances científicos y tecnológicos de la última década se cuenta con una amplia variedad de dispositivos que incluyen rociadores y detectores de humo, mantas ignifugas, uso de gases, agua nebulizada, láser, espuma, robots contra incendios, softwares y porque no, la inclusión de la IA para mejorar la respuesta contra incendios.
Bearing Capacity Equations for Intact Argillaceous and Arenaceous Rocks in Malaysia Derived from P-Wave Velocity
Authors: Nurul Huda Abdullah  , Ismacahyadi Bagus Mohamed Jais
Published: June 2024

This paper presents the derivation of the bearing capacity equation of shallow foundations using P-wave velocity based on the seismic refraction method on argillaceous rocks (shale) and arenaceous rocks (sandstone). Various theories of bearing capacity equations were developed over the years for the calculation of bearing capacity under vertical central loading. But, the most widely used on rock is the Mohr-Coulomb failure criterion given by Meyerhof (1963). Based on this theoretical development, the empirical equation of ultimate bearing capacity was obtained. The detailed derivation of these parameters is comprised of the results from Uniaxial Compressive Strength (UCS) and P-wave velocity values. The proposed empirical equation of bearing capacity derived from P-wave velocity herewith can be used as an alternative method in designing shallow foundations. There is a good agreement on the bearing capacity determination from P-wave velocities.
Electrochemical Synthesis of Ferrate (VI): Factors Influencing Synthesis and Current Research Trends
Authors: Zeng Feihu  , Sim Sy Yi
Published: June 2024

Ferrate(VI) emerges as a multifaceted substance endowed with a substantial redox potential, showcasing considerable potential for utilization in realms such as battery materials and advancements in water treatment technologies. There are primarily three methods for preparing Ferrate(VI), including peroxide heating method, hypochlorite oxidation method and electrochemical synthesis method. This review centrally delves into the electrochemical synthesis of ferrate(VI), given its mild reaction conditions, emerges as a highly potent means to synthesize Ferrate(VI) with substantial potential for industrial applications.The intricacies of influencing factors, including anode materials, electrolyte composition, electrolyte additives, reaction temperature, current density, membranes (ion-exchange membranes), and reactor types, are meticulously detailed, all of which exert a discernible influence on the synthesis process. A comprehensive exposition of the current research landscape and prevailing trends in the electrochemical synthesis of ferrate(VI) is presented. However, the current discourse on the electrochemical synthesis of Ferrate(VI) remains insufficient. Addressing these issues not only demands the optimization of reaction conditions but also necessitates the exploration of novel methodologies. For instance, incorporating the contextual application of Ferrate(VI) and achieving in-situ synthesis for immediate utilization are pivotal directions for future research and development.
Innovative and Cost-Effective Fabrication Technique for Dielectric Composite Material
Authors: Nurfarhana Mustafa  , Syamimi Mardiah Shaharum  , Ahmad Afif Mohd Faudzi  , Ayib Rosdi Zainun  , Toshihide Kitazawa  , Mohamad Shaiful Abdul Karim
Published: June 2024

In this paper, the fabrication process of epoxy resin and nanocomposite barium titanate using a cost-effective apparatus is presented along with measurements of complex permittivity. The material is prepared by mixing epoxy resin and barium titanate powder which has high permittivity. Measurement of complex permittivity of materials is performed using a waveguide technique in the G-band with a frequency between 4 and 6 GHz. The results are then compared with the previous works that use advanced and precision instrumentation. The results indicate that the material’s permittivity, determined using our proposed technique, performs admirably. Specifically, at a frequency of 5 GHz, the permittivity is 7.32 with a loss tangent of 0.025 for a filler concentration of 20%. These values not only meet but also closely match those obtained with high-end equipment. Therefore, the proposed technique could be a good potential as an alternative technique for dielectric material preparation which is suitable to be used as a substrate antenna.
Mechanical Characteristics Rice Husk Fiber (RHF) Blended Recycled Polyethylene (RPE) for RHF/RPE Polymer Composite
Authors: Iylia Izzati Jamal  , Noraini Marsi  , Anika Zafiah Mohd Rus  , Aiman Hisyam Saiful Bahri  , Asmadi Md-Said  , Mohamad Mohshein Hashim  , Izzah Aqilah Ariffin
Published: June 2024

This study investigates the mechanical characteristics of Rice Husk fibers (RHF) blended Recycled Polyethylene (RPE) to produce RHF/RPE polymer composites for building partition applications. The main objective is to formulate various composition ratios of RHF blended with RPE to fabricate optimum physical and mechanical properties to produce an RHF/RPE polymer composite. The significance of this research lies in developing a green polymer composite using natural resource materials such as RHF, which holds potential applications in Malaysia. Various ratios of RHF (0.2%, 0.4%, 0.6%, 0.8%, and 1.0% by weight) were combined with RPE to create RHF/RPE polymer composites. The RHF fibers were processed into fine fibers measuring 0.5 ± 0.05 mm using a high-speed grinding machine operating at 18000 rpm. The process involved blending RHF with RPE using a Bra-blender machine with a pressure of 20 kPa and a temperature of 120℃. The results indicated the composition ratio of 0.4 wt./wt.% of RHF/RPE polymer composite demonstrated the optimum density (ASTM C20-00) at 715.74 cm2 and porosity at 1.02 g/cm2, highest tensile strength at 0.60 MPa at tensile strength (ASTM D638) with SEM microstructure analysis confirming well-reinforced bonding between RHF/RPE matrix. The bending test at 0.4 wt./wt.% achieved the highest bending strength at 27.17 MPa, with a maximum bending strain of 2.41%, and the impact test (ASTM D256) demonstrated the highest impact strength at 36.16 MPa with an impact modulus of 1.25 MPa. It can be concluded that the optimal composition for building partition applications is 0.4 wt./wt.% of RHF/RPE polymer composites.
Mayfly Algorithm for Modelling a Horizontal Flexible Plate Structure
Authors: Annisa Jamali  , Aida Nur Syafiqah Shaari  , Muhamad Sukri Hadi  , Intan Zaurah Mat Darus
Published: June 2024

Flexible plates are widely used in engineering and the industry, primarily due to the lightweight nature compared to rigid counterparts. These structures offer benefits such as cost savings, lower energy consumptions and improved operational safety. However, a notable drawback is that flexible structures are vulnerable to unwanted vibrations, which can cause structural damages. Hence, the development of specialized models are essential to effectively addressing this challenge. Researchers have devised various approaches to suppress unwanted vibrations, with contemporary studies often employing system identification techniques utilizing swarm intelligence algorithms to construct dynamic models of flexible structures. Therefore, this research employs the potent mayfly algorithm (MA), known for its effectiveness in optimization tasks. The developed models using MA were then compared with traditional approach known as recursive least square (RLS) through a comparative analysis. The outcome reveals that RLS exhibited the lowest mean square error (MSE) at , while MA had an MSE of Yet, MA adeptly depicted the characteristics of the system, outperforming the RLS in these validation by indicating a 95% confidence level in the correlation test and exhibiting robust stability in the pole-zero diagram. Consequently, MA serves as a fitting algorithm to accurately depict the real behaviour of the flexible plate structure.
IoT Based Smart Palm Oil Seed Segregator using RGB Color Sensor
Authors: Izzatul Nadia Azhar  , Azlina Idris  , Nugrahini Susantinah Wisnujati  , Siti Maisurah Sulong  , Hendy Arsyad Rahindra
Published: June 2024

The manual seed grading process through human vision is tedious and time-consuming due to the tendency for errors and inconsistencies. Shell residues also failed to be properly segregated and required a huge amount of human energy as they were unable to be detected automatically once the waste container was full. The main objectives of this research are to develop an automated palm seed grading and sorting system to increase the seed’s sorting quality. The system can segregate palm oil and shell residues automatically to ease kernel recycling in the future. In addition, the system can implement the waste bins’ level detection, which can notify the user via the Blynk application, reducing the time and manpower required. To develop this system, sensor comparisons are done to determine the best-performing sensor to be used in the operation. The result shows that the RGB color sensor is the best color detecting sensor with an increment accuracy of 30.525%. As for the smart bin for shell residue, system response became 62.96% faster with the use of an ultrasonic sensor. The RGB sensor detects seed with readings <165 color concentration as freshly ripe and readings >165 color concentration as overripe. The janitor can be notified in real-time when the bins for oil and shell residues are full through the Blynk application using the WiFi module (ESP8266). The system has 100% accuracy, which was tested using the confusion matrix formula for both seed categories.
A Review on Evaluating the Optimization of Fibre Reinforced Polymer for Compound/Repair Clamp on Leaked Piping System using Computational Simulation
Authors: Ragu Chanthira Pillai  , Ahmad Mubarak Tajul Arifin  , Nor Adrian Nor Salim  , Mohd Nasrull Rahman  , Ishkrizat Osman Taib  , Shahrul Azmir Osman  , Shaktivell M. Letchumanan
Published: June 2024

Most industries around world depend on pipelines to transfer millions of gallons of flammable and non-flammable materials. However, this pipeline system has been affected by exposure, which may cause the entire system to fail due to corrosion-based issues. Repair clamps have been used to prevent total failure from happening in a continuous run. However, current design of repair clamp is consisting of metal whereby long usage on corroded pipe could be much more affected. The weight factor will be affecting the fluid flow and the structure of pipe when used in long run. Therefore, in this research, new design for the repair clamp will be done and the material will be change to fibre reinforced polymer (FRP). The new design with FRP will be undergo various stimulation on SolidWorks to compare the properties of clamp and the effect on the affected pipe. Since the FRP material properties has been proven to be more stronger and sustainable compare steel that has been using currently, it will be much more effective to use. As a result, the new design will be much more sustain than the old metal repair clamp. Since the new clamp is lightweight, the weight no longer will affect the corroded pipe internally and externally. Moreover, in this research some of the current repair clamp parts has been reduced and changed to compromise with the usage of the FRP.
Development of Driving Simulation Experiment Protocol for the Study of Drivers’ Emotions by using EEG Signal
Authors: Abdul Hafiz Abd Halin  , Wan Khairunizam Wan Ahmad  , Wan Azani Mustafa  , Muhajir Ab Rahim  , Zuradzman Mohd Razlan  , Shahriman Abu Bakar  , Saidatul Ardeenawatie Awang
Published: June 2024

The Brain-Computer Interface (BCI) is a field of research that studies the EEG signal in order to elevate our understanding of the human brain. The applications of BCI are not limited to the study of the brain wave but also include its applications. The studies of human emotions specific to the vehicle driver are limited and not vastly explored. The EEG signal is used in this study to classify the emotions of drivers. This research aims to study the emotion classifications (surprise, relax/neutral, focus, fear, and nervousness) while driving the simulated vehicle by analyse the EEG signals. The experiments were conducted in 2 conditions, autonomous and manual drive in the simulated environment. In autonomous driving, vehicle control is disabled. While in manual drive, the subjects are able to control the steering angle, acceleration, and brake pedal. During the experiments, the EEG data of the subjects is recorded and then analyzed.
Efficiency Analysis of a Passive Daylighting System Based on Northern Malaysia’s Climate
Authors: Mohd Sani Mohamad Hashim  , Muhammad Amin Zulkifli Din  , Abdul Halim Ismail  , Mohd Hafif Basha  , Nasrul Amri Mohd Amin  , Ng Yi Fei  , Muhamad Safwan Muhamad Azmi  , Siti Marhainis Othman  , Nur Saifullah Kamarrudin
Published: June 2024

Daylighting design strategy is important in order to have adequate lighting source in a room and necessary to decrease energy consumption for artificial lighting. Passive daylighting system utilizes daylight by collecting, reflecting and diffusing the natural light throughout a given area. The purpose for this study is to monitor, compare and analyse an optimum light pipe system design that can scatter daylight into a room based on three case studies. Lighting analysis was conducted using Autodesk 3ds Max Design software throughout the project based on the actual geographical parameters of Universiti Malaysia Perlis, Malaysia and also using the real sun azimuth on working hours. The results were compared according to the respective designs in order to observe the maximum internal illuminance and the average internal illuminance. The results show that the straight geometry with low aspect ratio produces the highest interior light intensity among other light pipe systems and the average internal illuminance values in the room was able to reach the minimum requirement of a small room which is 200 – 500 lux.
Design and Fabrication of Compact MIMO Array Antenna with Tapered Feed Line for 5G Applications
Authors: F. Taher  , Mohamed Fathy Abo Sree  , Hesham A. Mohamed  , Hussein Hamed Ghouz  , Sarah Yehia Abdel Fatah
Published: June 2024

In this paper, we design, fabricate, measure, and report two proposed multiple input multiple output antenna elements (MIMOs) with good performance in the 5G band. The MIMO antennas are mounted on Roger / Druoid 5880 substrates (dielectric constant: 2.2) with an overall structure volume 20×24.14×0.79mm3. First, a comprehensive parametric study is performed based on CST Electromagnetic (EM) Simulator to investigate and enhance the antenna performance in relation to 5G application requirements. Second, as part of the antenna design process, we compute the envelope correlation coefficient (ECC > 0.01dB) and diversity gain (DG> 9.9dB) and achieve good results. Third, we provide fabrication and measurement verification with good agreement. Fourth, we use a tapered feed structure with inset feed to minimize mutual coupling and achieve matching along 2 transmission lines with various impedances with high compactness in the antenna structure. Fifthly, we report that the proposed antenna structure has a gain is 8 dBi (dB) at the relevant operating frequency band (24.25
Analysing Flipped Classroom Themes Trends in Computer Science Education (2007–2023) Using CiteSpace
Authors: Tan Choon Keong  , Gao JiMei
Published: June 2024

Flipped classroom (FC) overcomes many drawbacks of traditional teaching and has a wide range of applications in the field of (computer science) CS education. Systematically analysing the research themes and keywords of the flipped classroom in CS teaching is of great significance in guiding the improvement of the teaching quality of the flipped classroom. In this study, we used CiteSpace to statistically analyse the data of 229 articles published in the core library of Web of Science from 2007 to July 18, 2023, and visualize author co-citation clustering, and keyword co-occurrence. The results of the study showed that (1) the statistical analysis indicated that the application of flipped classroom in CS education has entered a trough period; (2) based on the cluster of author co-citation network, three research themes of CS flipped implementation, online learning, and skill development were identified in this study. (3) Based on the co-occurrence of keywords, this study identified three research hotspots: integration strategies, flipping effectiveness, and challenges faced.
Metamaterial Structure Effect on Printed Antenna for LTE/WIFI /Cancer Diagnosis
Authors: Fatma Taher  , A. M. M. A. Allam  , Ahmed F. Miligy  , Mohamed A. Mohamed  , Mohamed Fathy Abo Sree  , Sara Yehia Abdel Fatah
Published: June 2024

In this paper, we will look at the impact of METAMORAL ULC on the performance of LTE / Wi-Fi printed antennas. We will look at two different antenna versions. One version will have the METAMORAL ground layer and will be the traditional antenna. The other version will have a METAMORAL load attached to the altered antenna. The metamaterial ground layer in the antenna will support the unit cell with the MTM structure, and we will look at how the MTM structure affects the performance of the antenna. We will use Roger 5880 with a substrate thickness (1.575 mm) and Dielectric constant (2.2) to test both antenna versions. The antenna’s overall dimensions are 60×49×1.575mm and the loss tangent is 0,0009. Once we have the ideal inductor/capacitor values, we will be able to create equivalent circuits for our planned circuit as well as the conventional circuit. We will then simulate the circuit in CST microwave studio. The path wave ADS simulator runs the equivalent circuit. The antenna is manufactured and measured by Network Analyser Rode Frequency ranges covered by the antenna are: 1.68 GHz 2.51 GHz 3.56 4.63 GHz 4.1 GHz 5.1 GHz Standard applications 2.58 dB/2.45 dB simulated gain 2.22 dB/5.19 dB observed gain Excellent agreement between measured and quoted value from both simulators Particular rate of absorption simulated On a sample Breast Phantom 1g / 10g SAR value must fall between 10g EU limit and 1g US limit Is suitable for use in Cancer diagnosis and detection?
Selection of the Best Students’ Leader in UPNM using Analytic Hierarchy Process Method
Authors: Muhamad Danial Haikal Muhd Zamzuri  , Fazilatulaili Ali  , Ruzanna Mat Jusoh  , Mohd Fahmi Mohamad Amran  , Dilum Dissanayake
Published: June 2024

As university students, it is crucial for them to understand the process of selecting the most suitable student leader based on the current criteria. This research aims to gather input from the high committee of the student club, providing a set of guidelines for students to identify the appropriate criteria for selecting a fitting leader within the university. Additionally, this study serves to motivate aspiring candidates who wish to take up leadership roles, inspiring them to refine the criteria identified through the study. At Universiti Pertahanan Nasional Malaysia (UPNM), there exist several clubs that function as representatives of student leadership. Each club has shown their own trend leadership criteria in accordance with students’ obsecration. Employing the Analytic Hierarchy Process (AHP) methodology, this research aimed to establish a ranking of the top student clubs at UPNM. The outcomes can serve as a point of reference for managing the selection by Student Council Representatives (SRC) and simplifying student decision-making. The study encompasses crucial criteria distilled from the questionnaire, with communication, creativity, commitment, and teamwork emerging as the four paramount factors. The method commonly uses a multiple-choice question (MCQ) to select which criteria are most relevant then rank the criteria by using the AHP method. This study involves the high committee of the 5 clubs in UPNM as an expert to compare 3 of the selected clubs as an alternative with 60% of the respondents were male, and 40% were females. The result shows that communication (0.52) is the highest criteria followed by teamwork, commitment and creative with 0.26, 0.14 and 0.08 weightage respectively. Hence, this also affects the alternatives with the highest is Debate Club followed by Peers Leader and MPP UPNM respectively.
Contextual Knowledge Framework in CAD Education from the Perspectives of Practicing Engineers
Authors: Mohd Fahmi Adnan  , Mohd Fadzil Daud  , Muhammad Sukri Saud  , Azhar Rauf
Published: June 2024

The contemporary industry landscape requires engineering graduates to have expertise in utilizing advanced Computer-Aided Design (CAD) tools. However, prevailing practices reveal a lack of contextual knowledge among Mechanical Engineering undergraduates and fresh graduate engineers in effectively employing 3D CAD modelling software for optimal product design development. Consequently, this study was undertaken to address this issue, with a specific focus on the integration of contextual knowledge into 3D CAD modelling. The study aims to elucidate the fundamental elements of contextual knowledge regularly employed by practicing engineers in their daily design endeavours, specifically in 3D CAD modelling. A transcendental phenomenology approach was used, and four engineers from the engineering department of a shipbuilding company in Peninsular Malaysia were purposefully selected as respondents. The analysis yielded three recurring themes central to the application of contextual knowledge in visualizing and presenting models through 3D CAD modelling: Realization, Design Intention, and Normalization. These elements are pivotal in assisting engineers in contextualizing their design work during the modelling and presentation stages of the new product development process.
Classification of Breast Cancer Subtypes using Microarray RNA Expression Data
Authors: Muhammad Shazwan Suhiman  , Sayang Mohd Deni  , Ahmad Zia Ul-Saufie Mohamad Japeri  , Aszila Asmat  , Lirong Wang
Published: June 2024

Breast cancer is a heterogeneous disease that involves molecular alteration, cellular alterations, and clinical outcome for which the classification of Breast cancer remains a challenge to diagnose. Current practice uses immunohistochemistry markers and clinical variables to classify Breast cancer, but this approach has limitations due to the inclusion of other tumour subtypes and healthy individuals. Machine learning approaches based on mRNA expression data offer new possibilities for researchers to investigate the potential of molecular biomarkers as one of the diagnostic characteristics. The purpose of this study is to evaluate features (genes) rank through feature selection method for Breast cancer diagnostic test. Three feature selection methods of IG, relief and mRMR were applied and subsets of top 100, 50, 25, 10, 5 and 3 were created. Each subset was tested with SVM, LR and RF classifiers and its performance was assessed using confusion matrix. The result of this study found that the feature selection of IG, reliefF and mRMR was able to achieve highest accuracy with SVM, LR and RF classifier. mRMR with RF classifier achieved highest accuracy with the least number of top rank genes with 25 genes. Hybrid feature selection approached (mRMR + SVM) improved accuracy of top 3 highest rank genes using SVM, LR and RF classifier. Future work should aim to use other feature selection methods and classifiers to explore the classification accuracy with the least features subset in multiclass cancer dataset.
Path Loss Models for 5G Communications System in Corridors Environment
Authors: Nor Raihan Zulkefly  , Omar Abd. Aziz  , Ibraheem Shayea  , Ahmed Al-Saman
Published: June 2024

This paper presents the propagation path loss channel models, developed from real-field measurement in Universiti Teknologi Malaysia (UTM) Kuala Lumpur, Malaysia. The purpose of the study is to characterize the channel at 28 GHz for 5G communications system in line-of-sight corridors environment. Measurement campaigns were conducted to measure the wireless signal of received signal strength at three different construction of straight corridors, narrow, wide, and open corridors. The large-scale path loss models are developed using the closed-in reference distance and floating–intercept modeling approaches. Besides contributing path loss models at 28 GHz for different corridors dimension, the result found in this work discovered the breakpoint distance of radio propagation is seen varies differently at those corridors.
Sensitivity Analysis of MHD Hybrid Nanofluid Flow over a Radially Shrinking Disk with Heat Generation
Authors: Najiyah Safwa Khashi’ie  , Mohd Fariduddin Mukhtar  , Nurul Amira Zainal  , Khairum Hamzah  , Iskandar Waini  , Abdul Rahman Mohd Kasim  , Ioan Pop
Published: June 2024

This work features the numerical computation and statistical analysis (response surface and sensitivity) for the flow and thermal progress of an axisymmetric copper-alumina/water hybrid nanofluid subjected to a permeable shrinking disk. The simultaneous factors of magnetic field (MHD), heat generation and suction parameter in the heat transfer development and flow characteristic are observed. The flow and energy equations are mathematically developed based on the boundary layer assumptions. These equations are then simplified with the aids of the similarity variables. The numerical results are then generated by the bvp4c solver in the Matlab software. The dual solutions are possible and exist up to a separation value upon the inclusion of suction effect. The increment of heat generation parameter from 0% to 1% reduces the heat transfer rate for all values of the stretching/shrinking parameter. For the response surface analysis, the responses (skin friction coefficient and heat transfer rate) are analyzed for three factors (magnetic, suction, heat generation) and three magnitudes (low, medium, high). Based on this analysis, the magnetic and suction parameters provide a significant effect on the skin friction with p-values < 0.05. Meanwhile, for the heat transfer coefficient, all factors give significant impact with zero p-values. Meanwhile, the sensitivity analysis reveals that the suction parameter has higher sensitivity to the heat transfer as compared to the magnetic and heat generation parameter. Even though these parameters being less sensitive, their influence on heat transfer remains statistically significant.
Effect of Titanium Dioxide on Cure Characteristics and Physico Mechanical Properties of High-Temperature Vulcanizing Silicone Rubber Composites
Authors: Leong Zhi Wei  , Noraiham Mohamad  , Siti Nor Rohimah Fauzi  , Hairul Effendy Ab Maulod  , Jeefferie Abd Razak  , Soh Tiak Chuan  , Qumrul Ahsan
Published: June 2024

Silicone rubber (SiR), a vital elastomer, is extensively used in producing various engineering and general products, owing to its distinctive properties. Despite the remarkable properties, SiR-based products require anti-microbial agents such as titanium dioxide, TiO2 to negate black mold issues. Still, adding this agent alters the composites' processability and physical and mechanical properties. This study examined the impact of adding different TiO2 content as fillers on silicone rubber composites' processability, physical properties, and mechanical properties. Raw materials of 20-hardness high-temperature-vulcanization (HTV) SiR- reinforced with various TiO2 contents at 0.0, 0.3, 0.6 and 1.2 wt% were prepared using a two-roll mill. The results indicated SiR composites reinforced with 0.3 wt% TiO2 exhibited the best performance with a tensile strength of 1.49 MPa, elongation at break of 340.87%, modulus 100% of 0.664 MPa, modulus 300% of 0.822 MPa, and modulus 500% of 0.954 MPa. This performance can be attributed to the efficient crosslink density and the effective interactions between the TiO2 and silicone rubber particles at this concentration. Structural and morphological analyses further corroborated the results. Consequently, it can be inferred that silicone rubber reinforced with 0.3 wt% titanium dioxide holds the potential for formulating silicone rubber compounds that necessitate anti-microbial properties.
Application of Extended Eddy-viscosity and Elliptic-Relaxation Approaches to Turbulent Convective Flow in a Partially Divided Cavity
Authors: Gunarjo Suryanto Budi  , Sasa Kenjeres
Published: June 2024

The paper reports on the numerical turbulence model in predicting mass, momentum and heat transfer in a partially divided cavity heated from the side using buoyancy-extended eddy-viscosity and elliptic relaxation approach with the algebraic expressions for the Reynold stress tensor and turbulent heat flux vector. The CDS (central differencing scheme) and LUDS (linear upwind differencing scheme) were used as the discretization method and the governing equations were solved using the finite volume method and Navier-Stokes solver. Validation of the model has been carried out by experimental data of convective flow in the cavity as well as by numerical data DNS (direct numerical simulation). The model agrees very well with the experiment and DNS and it is also able to demonstrate the performance which is comparable to that of the previous advanced second-moment closure model (SMC) in the literature. The results show that the model is suitable for use in simulations of the turbulent convective flow in a cavity with partition and it has the potential to be applied to more complex cavities and a wide range of turbulence levels.
Numerical Analysis into the Improvement Performance of Ducted Propeller by using Fins: Case Studies on Types B4-70 and Ka4-70
Authors: Berlian Arswendo Adietya  , Husein Syahab  , Mochammad Nasir  , Wasis Dwi Aryawan  , I Ketut Aria Pria Utama
Published: June 2024

Numerical analysis was conducted to assess the impact of fins on the B4-70 and Ka4-70 propeller performance. The study explored different fin variations, specifically bare fins, Propeller Boss Cap Fins (PBCF), and propeller nozzles, using computational fluid dynamics (CFD) simulations. To obtain the best results, the researchers utilized the explicit algebraic stress model (EASM) based on Reynolds-Averaged Navier-Stokes (RANS) equations and turbulence modelling. The primary goal of this study was to improve the energy efficiency of ships by examining various propeller configurations, both open and ducted. The overall conclusions indicated that the B4-70 PBCF convergent and Ka4-70 PBCF divergent with the addition of nozzle 19A exhibited the highest efficiency based on the EASM analysis. The CFD simulation results for both B4-70 and Ka4-70 propellers, utilizing a nozzle 19A with added boss cap fins, revealed several noteworthy phenomena. Firstly, for the B4-70 propeller, efficiency (η0) at J = 0.6 to J = 0.8 showed an increase of 1% to 2%. Secondly, concerning the Ka4-70 propeller, efficiency (η0) at J = 0.6 to J = 0.8 increased by 2% to 10%. These findings clearly demonstrate that the use of an ESD, such as the nozzle 19A with added boss cap fins, enhances the propulsion performance of the ship. It is evident that the CFD approach remains suitable and reliable for overall simulations.
Savonius-Magnus Hybrid Turbine Design Performance Based on Computational Fluid Dynamics
Authors: Rr. Heni Hendaryati  , Achmad Fauzan Hery Soegiharto  , Dolly Salwansyah  , Andinusa Rahmandika  , Bahrul Jalaali
Published: June 2024

Savonius turbine is a vertical-axis wind turbine (VAWT), which has the advantage of being able to capture wind from different directions. This turbine is suitable for high turbulent wind areas. The blade on the Savonius turbine used in this study is equipped with a Magnus rotor with dimensions of 120 mm in diameter and 720 mm in height. The main purpose of this study is to determine the torque and pressure generated by turbines with three and four blades. The design was then tested numerically with variations in wind velocity. The simulation model was created using computer-aided design software, namely Autodesk Inventor 2023, and then inputted into computational fluid dynamics (CFD) software, namely Ansys Workbench 2022 R2. Wind velocities were varied by 3, 5, 7, 9, and 11 m/s and simulated using transient time with constant wind velocity. The result of this study is that the largest pressure is generated by a hybrid turbine with four blades at a wind velocity of 11 m/s. The results show that the torque and wind pressure that occurs in three- and four-blade hybrid turbines tend to rise; the faster the wind, the higher the torque and pressure of both hybrid turbines
The Influence of Content Marketing on the Loyalty of Valorant Game Users at X-Gate
Authors: TJANDRA Anthony , WONO Hilda Yunita
Published: June 2024

In 2020, there is a new game called Valorant coming to Indonesia. Valorant is a first person shooter game that focuses on strategy, cooperation and player accuracy. Valorant Upload videos/images on their Twitter to introduce Valorant. Until now, the Valorant social media team continues to post content on their Twitter to attract more people. There are various types of content produced. From this variety of content, people are starting to get to know Valorant and try the game. Some of those who have tried still play Valorant to this day. So researchers want to know the influence of content marketing on the loyalty of Valorant game users using content marketing and loyalty theory and using the descriptive analysis method by deploying Google forms as a data collection tool for Valorant game users at X-gate Surabaya.
Exploring the Frontier of Password Cracking: Methods, Effectiveness, and Defense Strategies
Authors: kottarshettar Tejas , Prakash Dr. Febin
Published: June 2024

The manner of attacker's behavior cannot be underestimated; hackers use simple traditional attacks such as brute-force and dictionary attacks as well as sophisticated algorithms including: Markov models, probabilistic context-free grammars (PCFG), and generative adversarial networks (GANs). These are one of among the most advanced approaches which utilize artificial intelligence and machine learning to identify the patterns in passwords, guess them and crack them. Markov models calculate transitions from one character state to another, so they estimate password guesses as a probability which is sampled from the distribution. PCFGs further advance the concept by making use of context-specific inputs for producing the passwords, and as a result it is possible to come up with the candidates who are balanced and have the contextually valid characters. Years ago, the CPA attack was considered the ultimate approach for password cracking. Today, GANs have taken their place, implementing adversarial networks that use them as generators to generate valid password examples. It is evident from the research that abusing users' habits and context during password cracking has been proved that it can lead to a tremendous speed gain of the cracking process. The crackers exploit here patterns in the behavior and environmental features and tailor the cracking strategies. Besides that, recurrent neural networks (RNNs) and convolutional neural networks (CNNs) are considered to be good options in password modeling as well, where the ongoing researches are devoted to the structures of neural network so that the guessing powers of networks can improve. These new approaches have demonstrated an improvement of at least 10-15% over the outdated ones, thus they are credible in forming the password cracking paradigm shift. Thus, for defeating such sophisticated threats, companies should take into account such robust passphrase policies, teach the user about safety of passwords and implementation of rigid access mechanisms. Educating people on cyber threats basics and development of the reasonable cybersecurity culture are the factors that provide the impact reduction of attacks based on users’ behavior and contextual information.
Discursive subjugation and the ways out: Narratives of othering among Czech Roma mothers
Authors: SIDIROPULU-JANKŮ KATEŘINA , OBROVSKÁ JANA
Published: June 2024

This paper introduces the analysis of biographical interviews focusing on the negotiation of the day-to-day child-raising by Czech Roma mothers. We demonstrate the narrative reflection of ethnic identity, as well as coping strategies and ways out of the discursive subjugation of being marginalized by ethnic othering. We present coping strategies based on 1) vacillating between refusal and resigned acceptance of the negative discourse among the ethnic majority, 2) claiming normality through universal humanism, the submission of racialized microaggression, and the psychologizing of an aggressor, and 3) embracing family pride and social dissent. We find that primary socialization is an important element in tackling the discursive subjugation of ethnic othering. Further, we outline suggestions for the following research of othering mechanisms that seem to endure in European societies in terms of the reproduction of social inequalities.

This article was published open access under a CC BY licence:
https://creativecommons.org/licences/by/4.0
.
Ifj. Munczy Béla, I. világháborús naplói [Béla Munczy Jr.’s World War I war diaries]
Authors: Hajnáczky Tamás
Published: June 2024

This article was published open access under a CC BY licence:
https://creativecommons.org/licences/by/4.0
.
EDUCATIONAL DATA MINING AND LEARNING ANALYTICS: TEXT GENERATORS USAGE EFFECT ON STUDENTS’ GRADES
Authors: Pliuskuvienė Birutė , Radvilaitė Urtė , Juodagalvytė Rasa , Ramanauskaitė Simona , Stefanovič Pavel
Published: June 2024

Today, various types of data are constantly growing, so they can be used for different purposes. In this investigation, educational data has been analyzed to determine the influence of assessment on student knowledge. The newly collected dataset has been prepared and statistically analyzed. The dataset consists of open-question answers collected on one study subject during the midterm exam at Vilnius Gediminas Technical University. The results of the statistical analysis have shown that by using the text generators, students obtained higher grades by paraphrasing the answers to the questions in good quality. Furthermore, research has shown which types of questions are more difficult for students to answer without additional material and using text generation tools. It can be useful for lecturers planning course assessment tasks.
Risk assessment of landslides: Low probability scenario for the town of Kavarna, northern Black Sea coast of Bulgaria
Authors: Berov Boyko , Frantzova Antoaneta , Ivanov Plamen , Dobrev Nikolai , Krastanov Miroslav , Nankin Rosen
Published: June 2024

As part of the Reimbursable Advisory Services on Accelerating Resilience to Disaster Risks, the World Bank worked with the Interior Ministry of Bulgaria to develop a proposal for the National Disaster Risk Profile of Bulgaria. The purpose of this document, which is the fourth technical annex to the proposal for the National Disaster Risk Profile, is to provide particular conclusions, information, and techniques that were utilised to evalu-ate the risk of landslides in Bulgaria. For the first time at the national level, landslide risk assessment procedures based on ISO/IEC 31010:2019 Risk assessment techniques are being developed and applied in Bulgaria. The five primary categories in which the results are presented are physical safety, economic security, social well-being, environmental security, and security of tangible assets and critical infrastructure. The uncertainty (confidence) parameter is utilised, and it is subdivided into the following three basic categories: low uncertainty, medium uncertainty, and high uncertainty. The produced results demonstrate consistent applicability to empirical data analysis and real-world situations.
La pédopsychiatrie et ses liens avec les autres institutions de l’enfance
Authors: Gicquel Ivan
Published: June 2024

La pédopsychiatrie est née dans un contexte de délimitation des champs disciplinaires avec les autres institutions de l’enfance, l’école, l’éducation spécialisée, la protection de l’enfance et la justice des mineurs, en interface, en tant que partenaires de prises en charge partagées pour les situations complexes. Aujourd’hui, rendre compatibles des positions concrètes dans les projets avec le maintien d’une pensée vivante autour du sujet et de ce qui se joue entre les institutions est possible avec une nouvelle clinique interinstitutionnelle.
En limite du secteur, une unité mobile d’évaluation et de soutien ( umes )
Authors: Joussellin Jean-Jacques
Published: June 2024

L’unité mobile d’évaluation et de soutien est un dispositif de la pédopsychiatrie, au cœur d’un réseau partenarial, dont l’objet est de répondre aux appels des partenaires pour les soutenir sur des situations d’enfants et d’adolescents complexes induisant des vécus d’impuissance.
Réseau adolescence partenariat 31 ( rap 31). Itinéraire d’un enfant (éducateur) gâté
Authors: Ghaouti Mohamed
Published: June 2024

Trajet et regards d’un éducateur spécialisé sur les souffrances adolescentes dans notre société dans le cadre du dispositif Réseau adolescence partenariat ( rap  31) et du dispositif de clinique indirecte concertée ( d-clic ) participant à la sectorisation pédopsychiatrique.
Géopolitique de la religion chrétienne orthodoxe
Authors: Georgikopoulos Ioannis
Published: June 2024

Alors qu’un véritable schisme s’est produit à la fin des années 2010 au sein de la chrétienté orthodoxe, il importe de comprendre les stratégies d’influence et les divisions géopolitiques qui caractérisent le paysage confessionnel orthodoxe. Dans ce dessein, le schisme des années 2018-2022 ne peut se comprendre sans d’abord analyser les dimensions géopolitiques des questions spirituelles et confessionnelles, donc l’histoire et la géographie d’une religion chrétienne orthodoxe aux prises avec des antagonismes liés aux évolutions géopolitiques des territoires où elle est présente. Au plan qualitatif, cela permet d’affirmer l’importance, parfois négligé à tort, du fait religieux dans les relations internationales et, au plan quantitatif, de prendre la mesure de l’étendue des chrétientés orthodoxes.
Le rêve, entre actuel et origines
Authors: Gelas Bruno
Published: June 2024

Même si l’attention des poètes a toujours été requise par l’accès qu’offre le rêve à un obscur qu’ils pressentent soit transcendant soit intime, ils ont toujours veillé à bien les distinguer des poèmes dans leur nature et dans leurs enjeux. L’étude de deux « poèmes du rêve » permettra de montrer qu’ils en attendent de développer un vacillement des frontières entre le monde de l’énonciation et celui de l’énoncé ; et qu’ils sont en fin de compte moins guidés par le contenu du rêve que par la façon dont les jeux et le travail du langage permettent au contraire de se déprendre de la fascination de l’image.