bluuebunny/crossref_metadata_2025 huggingface dataset:
INVESTIGATION OF THE STRUCTURE OF ALSI25CU4CR AND ALSI25CU5CR ALLOYS
Authors: Dochev Boyan , Dimova Desislava , Zagorski Mihail , Kasabov Plamen , Kamburova Georgiya
Published: June 2023

The hypereutectic aluminium-silicon alloys AlSi25Cu4Cr and AlSi25Cu5Cr are heat treated T5, T6 and T7. The quenching of the alloys was carried out under the same conditions. Artificial aging at T5 was carried out at a temperature of 180º C for 2, 4 and 6h, and at T6 at 180º C for 8, 10, 12 and 14h. The artificial aging of the studied compositions at T7 was carried out at a temperature of 370º C for 20, 40 and 60 min. The influence of heat treatment on the size, shape and distribution of primary and eutectic silicon crystals in the alloy structure was investigated. It was established that the proposed heat treatment regimes do not lead to a significant change in the shape and size of the primary silicon crystals, but contribute to their uniform distribution in the structure of the studied alloys. Rounding of the silicon crystals in the composition of the eutectic of the investigated alloys was observed.
COMPARATIVE ANALYSIS ОF GEOMETRIC DEVIATIONS IN CONTACT MEASURING INSTRUMENTS FOR CONTROL AND LASER CONTACTLESS SCANNING
Authors: Georgiev Borislav , Karadzhov Tsanko
Published: June 2023

The factors affecting the dimensional accuracy of 3D scanning using a measuring arm with an integrated scanner and a custom open source 3D printer using FDM technology are researched in this paper, with the purpose of isolating and reducing the sources of errors affecting the results. A consumer 3D printer is analyzed in terms of achieving accurate physical dimensions, consistent shapes, and predictable surface coverage.
EFFECT OF CU AS МINORITY АLLOYING ЕLEMENT ON GLASS FORMING ABILITY AND CRYSTALLIZATION BEHAVIOR OF RAPIDLY SOLIDIFIED AL-SI-NI RIBBONS
Authors: Dyakova Vanya , Spasova Hristina , Kostova Yoanna , Mourdjeva Yana , Stefanov Georgi
Published: June 2023

The influence of copper as a minority alloying element in the process of rapid solidification of Al-Si-Ni ribbons produced by Chill Block Melt Spinning (CBMS) was investigated. XRD and TEM analyses proved a completely amorphous structure of the alloys Al74Ni16Si10 and (Al74Ni16Si10)98Cu2. The crystallization behaviour of these alloys was studied by DSC analysis. It was found that the crystallization of the amorphous alloys (Al74Ni16Si10)100-xCux, x=0, 2 runs in two steps. The temperatures Tx1 and Tx2 of each of the crystallization steps were determined. It was proven that the addition of 2 at. % copper does not significantly change Tx temperatures. The temperature difference ΔTx was calculated and it showed that more thermally stable is the copper containing alloy. Crystalline analogues of the amorphous alloys were obtained by annealing of the melt-spun amorphous ribbons at a temperature which exceeded by 170°C the onset crystallization temperature. The type and size of separated crystalline phases were determined by XRD. It was found that the addition of 2 at. % Cu to Al74Ni16Si10 alloy causes a separation of new phases - Cu3.8Ni and (Al, Cu)Ni3 and 54%, 24% and 7% size increase of the phases Al, Al3Ni, NiSi2 respectively.
EXPERIMENTAL REMOTE DETERMINATION OF THE STATIC CHARACTERISTIC OF THE ARC IN TIG WELDING
Authors: Gradinarov Deyan , Manilova Marina , Tongov Manahil
Published: June 2023

In the conditions of TIG welding, the magnitude of the current is set, but not the voltage of the arc. To determine the arc voltage at a set current, arc length, type of electrode, sharpening angle and others, it is necessary to know the static characteristics of the welding arc. This dependence facilitates the use of simulation modelling methods of welding processes. In the proposed study, the static characteristics of the welding arc in TIG process with 4 types of electrodes were determined experimentally. The magnitude of the current was set in the range of 20 to 200A and the arc voltage was measured. All parameters are measured remotely by a real-time welding monitoring system and transferred to a remote computer via the Internet. Graphs were built based on the recordings, and the numerical results were processed and regression relationships were obtained.
A THERMAL MODEL FOR WIRE ARC ADDITIVE MANUFACTURING
Authors: Tongov Manahil , Petkov Vladimir
Published: June 2023

Layer-by-layer detailing processes, which used wire and electric arc - wire arc additive manufacturing (WAAM), are among the most productive in 3D metal printing technologies. From this point of view, the solution of the thermal task, and subsequently of the deformation problem, are particularly relevant. It is natural that these simulation modelling processes are closely related to welding, but at the same time it is necessary to take into account particularities that are crucial for WAAM and are not always relevant in welding. In this research, one such model is proposed, which takes into account the gradual filling of the working space with the deposited metal. The specific issues related to the construction of the model, the definition of the heat source and the first layer formation in the conditions of WAAM are considered. The obtained numerical results enable the prediction of the layer dimensions.
OPTICAL SYSTEMS FOR REDUCING THE DIVERGENCE OF LASER BEAMS
Authors: Pulov Dimcho , Tsvyatkov Petar
Published: June 2023

The rational use of lasers as sources of radiation is also related to the development of optical systems for conversion of laser radiation. One of the ways to convert the laser radiation is related to its collimation, changing the cross-section and changing the divergence. This article presents a methodology for designing two component optical systems to reduce the divergence of laser beams.  Ready-made optical elements were used, with which three different configurations were created and analyzed. The optical design  was developed and subsequent optimization was performed. The resulting system has diffraction-limited quality of the outgoing laser beam and small dimensions.
INGREDIENTS DEGRADATION IN STEEL FIBER REINFORCED CONCRETE AFTER THERMAL LOADING
Authors: Rengasamy Kannasthan Karunamoorthy , Krasnikovs Andrejs , Macanovskis Arturs
Published: June 2023

The steel fiber reinforced concrete in structures provides good mechanical and physical characteristics and such material applications are increasing. At the same time, if structure is subjected to thermal load it is affecting both properties of reinforcement and matrix as well. The aim of the present research is to investigate the degradation of the characteristics of fibers, randomly distributed in the body of concrete block. A short steel fiber reinforced concrete slabs (400x300x18cm) [1], [2] with homogeneously distributed fibers was undergone to calefaction process from one side. dimension of 16.5x14.5x15 cm) Fiber fracture process was performed based on the single fiber pull-out test by preparing the specimens with fiber from calefacted SFRC block. Experimental curves from each layer were compared with different layer of fibers and investigation had shown that higher load-bearing capacity is there over the thermal loaded fiber. The conclusion were made with the microscopic results and the experimental data.
CONVEYOR-TYPE SMALL HYDROPOWER PLANT FOR SHALLOW RIVER WATERS
Authors: Beresnevich Vitaly , Cerpinska Marina , Irbe Martins , Viba Janis
Published: June 2023

This paper deals with the development of a small conveyor-type hydropower plant intended for operation in shallow river waters without construction of a dam. The proposed design offers a closed-shaped flattened conveyor equipped with flat-shaped blades. The conveyor is oriented perpendicular to the fluid flow. Several identical flat blades interacting with fluid flow are mounted on conveyor belt and move together with the belt in one straight line direction. Then after turning in the reversing mechanism, blades move in the opposite direction. The conveyor system has a built-in energy generator which drive shaft is connected with one of the reversing ends of the plant. Conveyor belt system dynamics analysis is performed on the base of equivalent model with one degree of freedom. The interaction of a moving conveyor flat blade in translation motion with fluid flow is studied by computer simulation with program Mathcad using a superposition principle. In accordance with this approach, a fast-chaotic motion of fluid particles (Brownian motion) is separated from the slow-directed flow motion, with the given average velocity. Optimization of system parameters (blade orientation angle to fluid flow, interaction constants of the braking generator) is performed, using a generated power as criterion. Simulation results confirm the serviceability and operational efficiency of the proposed hydropower plant in shallow river waters.
SOLVING FUNCTIONAL-TECHNOLOGICAL PROBLEMS USING A NON-PARAMETRIC APPROACH FOR CONTROL OF MICROGEOMETRY OF THE SURFACES OF DETAILS
Authors: Leonov Dimilyan , Metev Hristo , Krumov Kalin , Lengerov Angel
Published: June 2023

In the article considers the effect of surface roughness on the functioning of a specific mechanism. In case of proven dependence of the studied functional property of surface microgeometry, a process of optimization of the sought parameter is carried out, in which the methods of mathematical analysis and theoretic foundations of technology of appliance and mechanical engineering are used for the basis of the theoretical studies. As control parameters of the specified optimal microgeometry, deciding the given task, the so-called non-parametric criteria are used, namely graphical of certain surface-profile functions.
STUDY OF THE KINEMATIC AND DYNAMIC OF INTERACTION OF A VIBRATING SYSTEM FOR CUTTING OPTICAL SLUGS
Authors: Lengerov Angel , Krumov Kalin , Levicharov Georgi
Published: June 2023

In the article, studies of the kinematics and dynamics of interaction of the elements of the vibration system "slug-cut disk" are made. A mathematical model describing the trajectory of a cutting arm has been created and the technological parameters of the system at which the phenomenon of resonance occurs have been determined.
RESEARCH INTO 3D PRINTING LAYER ADHESION IN ABS MATERIALS
Authors: Bakardzhiev Valeri , Sabev Sabi , Kasabov Plamen , Chukalov Konstantin
Published: June 2023

The purpose of this article is to determine the impact of the two factors – layer thickness and printing speed in the adhesion of the layers in the ABS polymer. ABS control test tubes were printed and the tensile strength of each tube was measured. By means of statistical analysis, it was determined the impact of the layer thickness and the print speed on the adhesion between the layers. The research was focused on one of the most used materials in 3D printing. It can be concluded from the obtained results that the layer thickness has the greatest impact on the adhesion.
CHARACTERISTICS OF MOTIONS IN FACING
Authors: Poparov Angel , Izmirliqn Agop
Published: June 2023

In the process of work the tool angles change their value to become the working angles. This results in a variation of the work conditions of the cutting tools. The variation depends on the characteristic of the resultant cutting motion – the sum of the cutting motion and feed motion.In this article the characteristics of motions of facing are derived, which can serve as a basis for determining the relations between the tool and working angles.These relations can be used in programming the CNC to prevent the formation of negative working clearance angle and the destruction of the tool.
THE CHANGE OF CONTRAST IS INVESTIGATION OF 75 STEEL SAMPLES LASER MARKED WITH DIFFERENT MODES
Authors: Lazov Lyubomir , Padarev Nikolay , Yovchev Milko , Linkov Lyubomir
Published: June 2023

The quality of the marked surfaces changes the optical characteristics. The aim of the study is to optimize the contrast in laser marking of Steel 75. The influence of the step in the raster marking and the influence of the repetition frequency of the pulses on the reflection coefficient were analysed. The experimental investigations of the reflectance were carried out using a spectrophotometer. For the marked samples, it was found that when directing electromagnetic radiation with a wavelength in the studied range, there are areas with absorption and reflection of light. The reflectance is plotted as a function of marking step and laser frequency for the marked Steel 75 samples.
APPLICATION OF A FINITE ELEMENT MODEL TO OBTAIN THE INFLUENCE OF THE TREATMENT’S POWER, REFLECION AND FOCAL DIAMETER IN LASER TEXTURING OF ALUMINUM
Authors: Lazov Lyubomir , Draganov Ivo
Published: June 2023

In this work, a numerical model of laser texturing is considered. A finite element model of a representative sample of pure aluminum was created. The impact of a laser pulse was simulated, assuming a Gaussian volume distribution of the heat flux. Material properties are assumed to be constant and latent heat is accounted for. Results are obtained for the thermal field and the width of the vaporized zone, assuming that the crater is characterized by its maximum width. The numerical model was used to study the influence of pulse power density, reflection, focal diameter and pulse duration. The ablation threshold at different laser pulse durations was determinate.
APPROACH TO THE FORMING OF RATIONAL TECHNOLOGY FOR THE EXPORT CARGOES DELIVERY IN SUPPLY CHAIN ON THE PRINCIPLES OF CO-MODALITY
Authors: Orda Oleksandra , Nagornyy Yevgen , Potaman Natalia
Published: June 2023

In this article, we propose an approach to the forming of rational technology for the export cargoes delivery in the supply chain on the principles of co-modality in the context of effective interaction of delivery participants, which allows reducing the costs of all them through the optimal use of resources related to delivery and increasing the competitive advantages of products. Taking into account the strengthening of cooperation between road and rail transport, under modern conditions, combined transport within the international transport corridor is proposed as an alternative option to promote cargo flow in the supply chain. As a result of experimental studies carried out on the basis of the simulation model of the delivery process in the Petri Nets, the time characteristics of technological processes under alternative schemes depending on the input parameters of the model have been determined. A comparative assessment of alternative delivery schemes based on mathematical models has made it possible to establish that the rational scheme for the delivery of export cargo from Ukraine to Germany via the Pan-European Corridor III is the Rolling Highway technology, which ensures compliance with the cargo owner's requirements for delivery time and cost established by the contract. The proposed approach is recommended as a tool for making managerial decisions when planning and organising the delivery of export cargoes from Ukraine to the EU countries in order to effectively manage supply chains by minimising the cost of delivery and environmental damage.
COMPARATIVE STUDIES OF THE STRENGTH CHARACTERISTICS OF CONCRETE BLOCKS WITH TITANIUM AND IRON RODS (BARS)
Authors: Blumbergs Ervins , Mironovs Viktors , Sahmenko Genadijs
Published: June 2023

The relevance of the topic of the work was shown by the accident of a multi-storey residential building in Miami, which was caused by corrosion of steel reinforcement in reinforced concrete.There is a need to maintain the bearing capacity of structures for a long time in a humid climate, aggressive environmental influences and temperature fluctuations with a lower consumption of materials used.The use of titanium will allow changing some parameters of titanium concrete structures in comparison with reinforced concrete structures. The protective layer of concrete, which serves to protect the reinforcement from the effects of the external environment, will be significantly reduced. This will help to reduce the mass of concrete structures while maintaining strength properties and will allow you to create lighter structures that can withstand heavy loads.Strength tests were carried out on concrete blocks reinforced with smooth iron or titanium rods Ø10 mm, which showed the prospects of replacing steel reinforcement with titanium reinforcement in reinforced concrete.
INVESTIGATION OF SURFACE ROUGHNESS OF CARBON STEEL MACHINED PARTS AFTER NANOSECOND FIBER LASER MARKING
Authors: Tsvyatkov Petar , Yankov Emil , Lazov Lyubomir , Teirumnieks Edmunds , Pīgožnis Karlis
Published: June 2023

Laser marking with a nanosecond fiber laser is one of the most common ways to permanently mark various engineering materials. The roughness of the machined surface and its observation is essential to evaluate the impact on the contrast of the marking as well. Experimental studies of the roughness obtained as a result of the laser marking, were inspected using a 3D measuring laser microscope OLYMPUS LEXT OLS5100. Analysis of the graphical dependence of the roughness function on the four process parameters: laser power, frequency, speed of marking and step.
Kernel estimation methods for seismic hazard area source modeling
Authors: Woo Gordon
Published: June 2023

In probabilistic seismic hazard analysis, the representation of seismic sources by area zones is a standard means of data reduction. However, where the association between seismicity and geology is complex, as it is in many tectonic regimes, the construction of zone geometry may become contentiously subjective, and ambiguities may end up being resolved through appeal to the nonscientific rule of conservatism or pragmatism. Although consideration of alternative zonations within a logic-tree framework provides a channel for some of the uncertainty, it does not address the fundamental validity of the zonation procedure itself. In particular, neither the minimal assumption of uniform seismicity within a zone nor the Euclidean geometry of a zone accord with the fractal spatial distribution of seismicity, and the magnitude insensitivity of zonation ignores the spatial extent and correlations of different-sized earthquakes. An alternative procedure for area source modeling avoids Euclidean zones and is based statistically on kernel estimation of the activity rate density inferred from the regional earthquake catalog. The form of kernel is governed by the concepts of fractal geometry and self-organized criticality, with the bandwidth scaling according to magnitude. In contrast with zonal models for intraplate regions, the kernel estimation methodology makes provision for moderate earthquakes to cluster spatially, while larger events may migrate over sizeable distances.
Basin structure effects on long-period strong motions in the San Fernando Valley and the Los Angeles Basin from the 1994 Northridge earthquake and an aftershock
Authors: Pitarka Arben , Irikura Kojiro
Published: June 2023

The strong ground motions recorded within the San Fernando Valley and in the Los Angeles Basin during the 17 January 1994 Northridge earthquake show complex waveforms and complicated patterns of peak acceleration and velocity. This complexity persists even at long periods (1 to 10 sec). We investigate basin structure effects on long-period wave propagation in the San Fernando Valley and in the Los Angeles Basin by the two-dimensional finite-difference modeling of the mainshock and one selected aftershock with M = 4.1.

The aftershock ground motion records in the San Fernando Valley and in the Los Angeles Basin can be explained by basin structure effects, assuming a simple point source model. The structural effects and a source model composed of two subevents can explain the most prominent characteristics of the strong-motion waveforms observed during the mainshock at sites south of the epicenter, while such a combination is not enough to explain the large strong motions observed in the north. This result suggests that the rupture propagation effects significantly amplified the ground motions at sites north of the epicenter.
Development of Interactive Learning Media for Software Engineering Subject Chapter Process Modeling in Higher Education
Authors: Sari Nadia Roosmalita
Published: June 2023

The software development process model or what is commonly called SDLC (Software Development Life Cycle) is one of the Software Engineering (RPL) course materials in the Information Engineering Education (PTI) undergraduate study program where one of the competencies is understanding and knowing the concepts of device engineering software that can be applied in the software development life cycle which is summarized in the material for the SDLC software development process model. This material is the initial material that must be mastered by students to develop quality software. The use of interactive and interesting computer assisted learning media is expected to help the stages of the student learning process properly. This requires an interactive learning multimedia application. The purpose of this research is to develop interactive learning media as an alternative to independent learning tools to assist students in mastering the Software Development Process Model (SDLC) material for students and to find out the feasibility of multimedia application products for learning the Software Development Process Model (SDLC). The research and development methodology used in this research is Research and Development (R&D) with Borg and Gall's development steps which include: (1) Research and data collection; (2) Planning; (3) Development of product drafts; (4) Initial field trials; (5) Revision of trial results (6) Field trials; (7) Product improvement; (8) Field implementation test; (9) Completion of the final product; and (10) Dissemination of implementation. This methodology covers all matters relating to development to produce quality interactive learning media software. Based on the trials, the results obtained were 90.63 percent from media experts, 98.08 percent from material experts, 85.46 percent from initial field trials, 84.56 percent from field trials, and 86.27 percent from field implementation trials. The average value obtained is 89 percent based on the results of the overall data analysis. The conclusion of this research is that the development of multimedia applications for learning the Software Development Process Model (SDLC) is feasible as an independent learning medium. The product produced in this development research is a multimedia application for learning flash-based software development process (SDLC) models.
Development Of Interactive Learning Multimedia With Challenge Based Learning To Empower Vocational Students’ Problem-Solving Ability
Authors: Irfanudin Muhammad Ardian , Rosyid Harits Ar
Published: June 2023

Based on the results of observations and interviews at SMK Negeri 12 Malang and several SMKs in Malang, it shows that, (1) Lack of adequate and easily accessible learning resources; (2) Learning resources only rely on material demonstrations with the help of .pdf and .ppt files; (3) The low problem solving ability of students in solving programming problems; (4) The material only refers to BSE whose competence is not in accordance with the current curriculum; and (5) Lack of use of smartphones by students in learning activities. This research and development aim to develop, test the feasibility, and determine the effect of PWDPB application learning media on students' problem-solving abilities. The research and development model adopts the ADDIE development model. The results of material validation by 2 experts obtained a percentage of 89.13 percent, the results of media validation by experts obtained a percentage of 92.73 percent, the results of small group trials obtained a percentage value of the media feasibility level of 78.32 percent, and 88.93 percent for In large groups, the level of media influence on students' problem solving abilities in small groups obtained a percentage of 74.42 percent and 85.69 percent in large groups. Based on the data from the validation and trial results, the PWDPB application learning media can be concluded. As follows: (1) the overall feasibility through the evaluation stage, the response criteria are quite feasible; (2) The effect of the product on the user's problem-solving ability obtained a response from the user with quite good criteria.
Interactive E-book Development for Graphic Design Subjects at Multimedia Department of Vocational School in Malang
Authors: Nugroho Hario Muttaqin Yuda , Suswanto Hary
Published: June 2023

This research is based on learning media that is not suitable enough to the needs of students. Most of students don’t understand about the using of e-book in the class because of incomplete learning media material. The development of e-book is used for printing graphic design subjects for grade XI in SMKN 5 Malang. The purpose of this research is: (1) to develop an e-book as printing graphic design learning media for grade XI in multimedia department SMKN 5 Malang. (2) to increase students’ understanding of printing graphic design material by using an e-book. (3) to know the efficiency level of e-book on printing graphic design subjects in even semester. The method of this research is true experimental and pretest-posttest control group as the design model. Data analysis uses 4D e-book development model. There are four important steps in 4D model, that are: (1) Define, (2) Design, (3) Development, and (4) Disseminate. The validation of e-book is done by material experts, media experts, small-scale test, and wide-scale test. The average results of the validation percentage of media experts and material experts is 91,5 percent. The average percentage of small-scale test media validation is 87,75 percent and the average percentage of wide-scale test media validation is 86,42 percent. Based on validation, the total average percentage of learning media is 88,55 percent. On the students learning outcomes show that there is an increasing of average value from pre-test value to post-test value. The average pre-test value is 46,67 percent and the average post-test value is 88,09 percent. These results show that the using of e-book is efficient in learning process for printing graphic design subjects.
Influence of Problem Based Learning and Problem Solving Learning Combined with Braistorming on the Vocational High School Students’ Learning Outcomes
Authors: Romadhona Mohamad Johan , Putro Setiadi Cahyono , Mustapha Ramlee Bin
Published: June 2023

Based on the results of observations made in class X TKJ SMKN 2 Probolinggo, it shows the lack of courage of students in expressing opinions, students' skills in solving problems are less than optimal, and basic programming learning outcomes obtained by 69% of students below the KKM. The problem is the background of this research to determine the learning outcomes (Y) of basic programming because of the influence of the application of the problem-based learning model combined with brainstorming (X1) compared to problem solving learning combined with brainstorming (X2). The learning outcomes in question are knowledge learning outcomes (Y1) and skills learning outcomes (Y2). This study aims to: (1) reveal the significance of the difference in Y1 due to the effect of applying X1 compared to X2; (2) revealing the significance of the difference in Y2 due to the effect of applying X1 compared to X2. This study used a quasi-experimental research design with a pretest posttest design. The subjects of this study were class X TKJ 1 and class X TKJ 3 as. Class X TKJ 1 amounted to 34 students were given X1 treatment. Class X TKJ 3 totaling 32 were given X2 treatment. The results of hypothesis testing using t-test, show Y1 class X TKJ 1 compared to class X TKJ 3 obtained a significance number of 0.012, Y2 class X TKJ 1 compared to class X TKJ 3 obtained a significance number of 0.000. The conclusion from the research is that there is a significant difference between the results of learning basic programming because of the effect of applying the problem-based learning model combined with brainstorming compared to problem solving learning combined with brainstorming
Relationship of Field Studies and Social Environment on Students' Interest in Teaching Profession (Study in Bachelor Study Program of Information Engineering Education at Universitas Negeri Malang)
Authors: Saputra Abdi Kholis , Irianto Wahyu Sakti Gunawan , Prihanto Dwi
Published: June 2023

The purpose of this study was to reveal the significance of the relationship between: (1) Field Study (X1), Social Environment (X2) and Interest in Becoming a Teacher (Y); (2) XI and X2 with Y partially; and (3) X1 and X2 with Y simultaneously. This type of research was ex-post facto research with descriptive analysis, partial correlation analysis and multiple regression analysis. The population and sample in this study were 105 PTI undergraduate students who had implemented Field Study. The results showed that there was a significant positive relationship: X1 with Y (rx1y equal 0.265); X2 with Y (rx2y equal 0.398); and between X1 and X2 with Y (Rx1x2y equal 0.281).
Android-based Learning Media Development for Computer and Basic Networking at State Vocational High School 1 Bandung Tulungagung
Authors: Ardiansyah Febri Yuda Nur , Lestari Dyah , Pujianto Utomo
Published: June 2023

This development aims to design and develop android-based learning media for Computer and Networking subjects in Class X of Computer and Network Engineering of State Vocational High School 1 Bandung Tulungagung. The development method applied in this development uses the ADDIE development model. This model has five steps, namely (1) analysis, (2) design, (3) development, (4) implementation, (5) evaluation. This android-based learning media was then tested on experts and 30 students of class XI of the Computer and Network Engineering Expertise Program at State Vocational High School 1 Bandung Tulungagung. The product produced in this development is an android-based learning media. After analyzing the data, the proportion of learning media from expert I was 82.50 percent, expert II was 83.33 percent, small group trial was 86.50 percent, field trial was 88.58 percent. The overall average percentage of expert I, expert II, small group trial, and field trial was 86.38 percent
Field Practice Studies, Self-Efficacy, and Pedagogic Competence Effect on Interest in Teaching Profession to Candidates for Undergraduate Informatics Education at Universitas Negeri Malang
Authors: Adyatama Yudha Adhenda Jaka , Rahmawati Yuni , Ningrum Gres Dyah Kusuma
Published: June 2023

The background problem in this research is that the 2015 Informatics Engineering Study Program students have low interest in the teaching profession. This study aims to: (1) describe the Field Practice Study, self-efficacy, pedagogic competence, and interest in being a teacher; (2) revealing the partial effect of Field Practice Study, self-efficacy, and pedagogic competence on interest in becoming a teacher in undergraduate students of Informatics Engineering Education Faculty of Engineering, State University of Malang; (3) revealing the simultaneous influence of Field Practice Studies, self-efficacy, and pedagogic competence on interest in teaching profession in undergraduate students of Informatics Engineering Education, State University of Malang. The research method used is ex post facto with a descriptive correlational research design. In this study, there are three independent variables, namely Field Practice Studies (X1), self-efficacy (X2), and pedagogic competence (X3) and one dependent variable, namely interest in teaching profession (Y). The population and sample in this study were undergraduate students of Informatics Engineering Education class of 2015 who had carried out Field Practical Studies (KPL) activities, totaling 80 students. The data collection technique in this study used a questionnaire/questionnaire. The results showed: (1) the level of KPL, pedagogic competence, and interest in being a teacher were in the high category while self-efficacy was in the medium category; (2) there’s positive and significant effect between the KPL on interest in becoming a teacher, with a tcount of 2.152 and a significance value of 0.03; (3) there’s positive and significant effect between self-efficacy on interest in becoming a teacher, with a tcount value of 2.053 and a significance value of 0.04; (4) there’s positive and significant effect between pedagogic competence on interest in becoming a teacher, with a tcount of 2,314 and a significance value of 0.02; (5) There’s positive and significant effect between the Field Practice Study, self-efficacy, and pedagogic competence on interest in becoming a teacher, with an Fcount of 7.606 and a significance value of 0.000. The amount of the Effective Contribution (EC) of the three independent variables is 23.1 percent
Implementation of Measurement of Customer Satisfaction Index Using Google Classroom (Case Study: SMK Negeri 2 PPU)
Authors: Fitriani Nadiah , Setyaningsih Erlin , Darmansyah Darmansyah
Published: June 2023

SMK Negeri 2 Penajam Paser Utara is located on Jl. Province Km. 08 Nipah-Nipah Penajam District is one of the many North Penajam Paser that use the Google Classroom Application as a substitute medium in the online learning process (on the network) during the COVID-19 pandemic. The level of satisfaction is the difference between the user's perceived performance and his expectations. When performance is below expectations, users will feel disappointed. This research aims to find out how satisfied the students of SMKN 2 PPU are in using the Google Classroom Application. The method used is the Customer Satisfaction Index (CSI) which helps determine the level of satisfaction using the Google Classroom Application. Based on the Customer Satisfaction Index analysis, the results obtained are 73.11 percent, which shows that users feel "Satisfied" while using the Google Classroom Application.
Improving Student Learning Outcomes through Utilization of Interactive Learning Media with Creative Problem Solving
Authors: Firmansyah Moh Yusril , Patmanthara Syaad , Sutapa Yohanes Gatot
Published: June 2023

Acceptance of information technology changes the paradigm through the internet network used on smartphones. The results of observations at SMKN 7 Malang with teachers of basic graphic design subject in class during the COVID-19 pandemic which were held remotely through their respective homes, that the use of conventional models and PowerPoint media used by teachers is less easy to explain basic lessons graphic design, the PowerPoint produced through the material presented are difficult to accept, and the use of media in learning activities that is not maximized to be able to motivate students to improve learning outcomes. This study aims to design interactive learning media based on graphic design with creative problem-solving content in improving student learning outcomes in class X TKJ. This study uses the ADDIE development research model and Waterfall. The test subjects of this study included material experts, media experts, and X TKJ students in SMKN 7 Malang. From the results of development research, this interactive learning media obtained an average score of media experts with a value of 92.78 percent and material experts with a value of 82.97 percent. Then from the small group trial with a value of 91.20 percent, and from the large group trial with a value of 80.37 percent. The effectiveness of the product is evidenced by the student’s final post-test scores. In conclusion, creative problem-solving learning media content that was developed is very appropriate and effective for use in student learning activities at SMKN 7 Malang.
Implementation of the STAD Model on Mobile Learning Applications to Improve Student Learning Outcomes at Vocational Schools in Malang
Authors: Masduki Wahyu Agil , Patmanthara Syaad , Yunus Yunus
Published: June 2023

Software Modeling is a discipline that studies procedures in developing software using various development models. This study aims to produce mobile learning media products using the STAD model to improve student learning outcomes in software modeling subjects. The development of this learning media uses the ADDIE development model. The test subjects in this study were students of class XI RPL SMKN 8 Malang who were divided into 3 trial subjects who were randomly selected, namely: (1) 2 individual trial subjects, (2) 10 small group trial subjects, and (3) large group trial subjects totaling 30 people. The results of media expert validation show that 95.2 percent of learning media is very valid and based on material experts 88 percent of the material in learning media is very feasible to use in the learning process. In the individual trial process, a percentage of 80.9 percent was obtained with very valid criteria, through small group trials, a percentage of 83.2 percent was obtained with very valid criteria, and large group trials showed that the media was very valid with a percentage of 85.9 percent. The results of increasing learning outcomes can be seen from the comparison before and after using the media by comparing the average grades and classical completeness scores of students. Before using the media, an average score of 67 was obtained with 63.3 percent classical completeness and after using the media, an average score of 88 was obtained with 96.6% classical completeness. Based on these results it is concluded that learning media is appropriate for use in the learning process
Simple Additive Weighting Algorithm Implementation for Determining Supervisors in Student Final Project Information System
Authors: Asfani Khairudin , Firdaus Azmi Fachriza , Basyirun Basyirun
Published: June 2023

The determination of the student supervisor for the final project at the Department of Electrical Engineering, State University of Malang, is determined by the Expertise Group and Study Program Coordinator. The determination is carried out and considered manually by both. It requires considerable time and effort, so the process is less efficient. Therefore, this study aims to develop an information system that can handle all processes related to the final project based on the Standard Operating Procedures applicable in the Department of Electrical Engineering, State University of Malang. This thesis and final project information system were developed using the Waterfall development model, which consists of four steps, namely: (1) Analyze; (2) Design; (3) Codes; and (4) Test. The method or algorithm applied to this information system is Simple Additive Weighting (SAW). Information systems experts and users test the system at every user access level. The tested data was obtained through a questionnaire. Based on the trials that have been carried out, the percentage results obtained are 100 percent for system validity by information systems experts, 97.41 percent for system validity by students, 93.75 percent for system validity by supervisors, 91.32 percent for system validity by members of Expertise Group, 100 percent for system validity by the Chair of the Expertise Group and Study Program Coordinator. The average percentage of trial results by all user access levels is 98.24 percent, indicating that the information system developed is considered valid and can be used by the University
Improving the Quality of Blended Learning through Mobile Learning Applications in Basic Programming Learning for Vocational School Students
Authors: Amin Mohammad Nasikhun , Ramadhani Dwitha Fajri , Herwanto Heru Wahyu
Published: June 2023

The development of science and technology demands a more effective and innovative learning process that gives rise to various types of technology-based educational innovations. The results of observations and informal interviews at SMKN 1 Kepanjen found that basic programming is a subject that is considered difficult, the time allocation given is also lacking, the methods and media used by teachers have not helped students learn the material, and the use of mobile devices in learning is still lacking. This development research followed ADDIE's steps which consisted of five stages, namely analysis, design, development, implementation, and evaluation. The results of this development research are (1) to produce a mobile learning media product called coding; (2) learning media is stated to be very valid to be used as learning media in terms of the media expert's average score of 96.64 percent in the very valid category, the mean material expert's validity score is 87.94 percent in the very valid category, the small group's average score is 85.15 percent in the very decent category, and the mean score of the large group was 81.90 percent in the very decent category; and (3) the usefulness of the product is proven through learning independence which is obtained from the student's response of 79.28 percent in the effective category.
Development and Quality Analysis of Web-Based Library Information System based on ISO 9126 Standard
Authors: Akhsan Rivaldi Rizalul , Apriliasari Dewi , Mangesa Riana Tangkin
Published: June 2023

Management of book collection at the Department of Electrical Engineering, State University of Malang is less  effective and efficient because the management process is carried out manually and centrally on a single computer  (stand alone). This research purposes is to describe, develop, and test a reference book management information  system based on Model View Controller (MVC) in the Department of Electrical Engineering, State University of  Malang. The development model that used in this research is waterfall model which consists of analysis, design,  implementation, and testing step. Testing is carried out to determine the quality of the developed system. Testing  of the product in this research is using ISO 9126 indicators with aspects of functionality, and usability. The results  showed that: (1) the reference book management information system was developed using the Codeigniter  framework and the waterfall development model consisting of the needs analysis, design, implementation, and  testing step, and (2) the test results on the functionality aspect obtained a value of 1 ( good). Usability testing  obtained a result of 4.03 (very feasible) obtained from the results of the average assessment of students and  librarian responden.
Digital Flip Book Based E-Modules on Financial Literacy Materials
Authors: Kusumadyahdewi Kusumadyahdewi , Firdiansyah Yhadi
Published: June 2023

Financial literacy is very much needed with the rise of financial products and financial service institutions that are currently available both online and offline. Consumers must have financial knowledge so that they can make good use of it, and not fall into financial problems easily. Financial literacy is focused on financial planning, banking, insurance and investment according to the circular of the Financial Services Authority (OJK) to the public. Students as human beings who are prepared to face a financially independent life, must also be equipped with financial literacy so that they can utilize financial products in their financial planning. Therefore, it is very important to compile modules for students who are currently inseparable from their smartphones and laptops. This e-module can be accessed anytime and anywhere with the gadget you have, both online and offline. The research method used is R & D from Sugiyono which consists of 10 stages. This study develops learning media in the form of e-modules for students and assesses the feasibility of media experts, material experts and students as users. The media expert's assessment resulted in 92.85, from material experts 95.31 and small group students 90.5 while the large group was 88.74 which all showed very valid categories. This shows that the e-module is acceptable and appropriate to be given to students for the Financial Management course on Financial Literacy.
Growing Teaching Motivation for Future Teachers Through Microteaching
Authors: Soraya Dila Umnia , Patmanthara Syaad , Kusuma Ningrum Gres Dyah
Published: June 2023

The teacher is the main foundation for implementing successful learning in delivering students to achieve their goals and aspirations. Teacher in learning does not only transfer knowledge but also transfers positive values that will equip students to live in society. The meaning of learning for teachers and students cannot be separated from the teacher's role as a motivator. Apart from having to have basic teaching skills, teachers are also required to have self-motivation in teaching. One of the efforts to train and improve basic teaching abilities and skills for student teacher candidates is through microteaching. This step is also an effort to increase the teaching motivation future teachers at educational universities, especially the State University of Malang. The purpose of this study is to determine the level of teaching motivation future teachers who have implemented microteaching, in terms of 2 indicators, namely intrinsic and extrinsic motivation. This research is a quantitative descriptive with 142 students from 8 faculties of education at Malang State University as subjects. The research instrument uses a closed questionnaire with a Likert scale that has been tested for validity, reliability, and normality. Data were analyzed descriptively to measure the level of teaching motivation future teachers at Malang State University. The results of the study show that the teaching motivation for future teacher students is mostly at a moderate level. While the percentage of intrinsic motivation is higher than the extrinsic motivation. So it can be concluded that microteaching activities have succeeded in growing future teachers' teaching motivation, especially on intrinsic motivation. The desire to succeed, the encouragement and need in teaching, as well as the hopes and aspirations for the future are the driving force behind teaching motivation for future teacher students at the State University of Malang.
Isolation and characterization of cancer-associated fibroblasts in the tumor microenvironment of hepatocellular carcinoma
Authors: Mun Kyoungdo , Han Jiwon , Roh Pureun , Park Jonggeun , Kim Gahee , Hur Wonhee , Jang Jeongwon , Choi Jongyoung , Yoon Seungkew , You Youngkyoung , Choi Hojoong , Sung Pilsoo
Published: June 2023

Background/Aim: Cancer-associated fibroblasts (CAFs) play an immunosuppressive role in the tumor microenvironment (TME) of human cancers; however, their characteristics and role in hepatocellular carcinoma (HCC) remain to be elucidated.Methods: Nine tumor and surrounding liver tissue samples from patients with HCC who underwent surgery were used to isolate patient-derived CAFs. Cell morphology was observed using an optical microscope after culture, and cell phenotypes were evaluated using flow cytometry and immunoblotting. Cytokines secreted by CAFs into culture medium were quantified using a multiplex cytokine assay.Results: CAFs were abundant in the TME of HCC and were adjacent to immune cells. After culture, the CAFs and non-tumor fibroblasts exhibited spindle shapes. We observed a robust expression of alpha-smooth muscle actin and fibroblast activation protein in CAFs, whereas alpha-fetoprotein, epithelial cell adhesion molecule, platelet/endothelial cell adhesion molecule-1, and E-cadherin were not expressed in CAFs. Furthermore, CAFs showed high secretion of various cytokines, namely C-X-C motif chemokine ligand 12, interleukin (IL)-6, IL-8, and C-C motif chemokine ligand 2.Conclusions: CAFs are abundant in the TME of HCC and play a crucial role in tumor progression. These fibroblasts secrete cytokines that promote tumor growth and metastasis.