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Enhancements to the Work Ability of a High-Speed Motor Used in Machine Tools

Author(s): Wawan Purwanto,Yusuf Dewantoro Herlambang,Kristine Mae Paboreal Dunque,Firoj Mulani,Dwi Sudarno Putra,Martias Martias / Language(s): English Issue: 3/2023

This paper presents a strategy for maximizing the effectiveness of high-speed spindle motors in manufacturing equipment. Using the ideal design of the stator winding geometry, as calculated by the Taguchi method, we were able to increase the maximum torque and efficiency. The rotor slot geometry was optimized using a response surface to raise the starting torque and reduce the starting current. The objectives of this investigation were to come up with a strategy for designing high-speed spindle motors so that they have better performance in terms of starting torque, maximum torque, efficiency, and starting current. Spindle motor temperature rise was the focus of the thermal measurements. Finally, a working spindle motor prototype was built and tested to verify the results of the Finite element analysis (FEA). The validity of the suggested model is demonstrated by a comparison between experimental measurements and finite element findings. The total percentage of mistakes was close to 2%.

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Time Series Regression: Prediction of Electricity Consumption Based on Number of Consumers at National Electricity Supply Company

Author(s): Mohammad Idhom,Akhmad Fauzi,Trimono Trimono,Prismahardi Aji Riyantoko / Language(s): English Issue: 3/2023

Electrical energy is one of the components of Gross Domestic Product that is able to encourage the economy because it has become a basic need of the community. To meet the increasing demand for electrical energy, the Indonesia National Electricity Providers (PLN) need to predict the amount of electrical power required based on the customer numbers to meet the demand for adequate electricity supply. This study aims to predict electric power based on electricity user customers using a time series regression model. The data used in this study are secondary data which get from PLN annual report in 2021. This study resulted in a finding of the best prediction model based on the Akaike Information Criterion (AIC) value, namely the time series regression model with the error value modeled by the AR(1) model, while the forecasting accuracy measure used the value MAPE of 9.77%. This means that the result of model prediction is highly accurate.

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Evaluating the Reliability of a Machine Vision System for Collaborative Robots: An Experimental Study in the Industry 4.0 Environment

Author(s): Jakub Müller,Miroslav Malaga,Tomáš Broum / Language(s): English Issue: 4/2023

This research evaluates the reliability of a machine vision system connected to a collaborative robot. In recent scientific papers, the authors have focused on machine vision itself, machine vision systems and related theory in general, along with machine learning methods, and image processing itself. However, there seems to be a missing link between these topics and the industrial robot's accuracy in basic tasks when utilizing machine vision. The experiments conducted, took place within an Industry 4.0 laboratory, where 3D-printed objects were utilized as test subjects. The collaborative robot, equipped with machine vision, performed tasks such as object removal and stacking. The evaluation focused on the success rate of object assembly and grasping. The paper discusses the integration of machine vision technology, previous research on reliability, and the use of a 2D camera for the collaborative robot. The findings contribute to understanding the potential of machine vision in enhancing efficiency and precision in collaborative robot workspaces.

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Performance of Lambda Expressions in High Level Programming Languages

Author(s): Todor Todorov,Nikolay Noev / Language(s): English Issue: 4/2023

Functional programming is a programming paradigm that is becoming increasingly popular among software developers. This is due in part to the rise of distributed systems and the need for more robust and scalable code. In the paper is presented an overview of the syntax and capabilities of Lambda expressions in three programming languages – C#, Java and Python. Performance of programming language constructions is an important research task. Some popular topics for investigation are comparison of programming languages efficiency in fields like bioinformatics or classification of Lambda expression usage and their productiveness. In the current study the performance of Lambda expressions is tested with three specific test cases and the results are compared to alternative technologies that could be used to solve similar problems. The results shows that speed performance of C# is the best from the compared languages and that List Comprehensions is the optimal method for collection filtering in Python.

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An Overview of Information Systems and Process Automation in Peruvian Microenterprises

Author(s): Rafaela Paredes-Cruz,Armando Velásquez-Valdiviezo,Alexander Matias-Benites,Oscar Peña-Cáceres / Language(s): English Issue: 4/2023

The purpose of this research is to review the literature on the importance of Information Systems (IS) and process automation in Peruvian microenterprises, and how they can improve their efficiency and complexity in the market. The activities addressed were related to identifying, analyzing, evaluating, and proposing alternative solutions for the implementation of information systems and process automation in Peruvian microenterprises. The methodology used was PRISMA. Inclusion criteria were established considering relevance, contribution, time of publication, and studies related to the topic. The study demonstrates the existence of a lack of information systems implementation process in Peruvian microenterprises. The reasons are centered on limited economic resources, a poor purchasing power, the lack of knowledge about the benefits of technologies and the unstable perception of the contribution of information systems.

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Loss-minimal Algorithmic Trading Based on Levy Processes

Author(s): Farhad Kia,Gábor Jeney,János Levendovszky / Language(s): English Issue: 3/2014

In this paper we optimize portfolios assuming that the value of the portfolio follows a Lévy process. First we identify the parameters of the underlying Lévy process and then portfolio optimization is performed by maximizing the probability of positive return. The method has been tested by extensive performance analysis on Forex and SP 500 historical time series. The proposed trading algorithm has achieved 4.9\% percent yearly return on average without leverage which proves its applicability to algorithmic trading

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System for Detection of Network Threats based on Classifiers

Author(s): Bilgin Demir,Zoran Gacovski,Vladimir Pivovarov,Lidija Goracinova / Language(s): English Issue: 2/2014

In this paper we present a system that automatically detects and profiles threats on a real network. The realised Threat Detection System (TDS)is based on Snort software and it allows the security experts to evaluate the risk of vulnerability and to retrieve the actual number of threats that are active in the network.Algorithms are presented to determine three properties for each threat: skill, intensity of the attacks and whether the threat is a human or an autonomous computer program

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Finite Element Analysis of Gear Like Form by Using Lateral and Forward Extrusion

Author(s): Tahir ALTINBALIK,Önder AYER / Language(s): English Issue: 2/2014

The aim of this research is the reduction in deformation load, improvement of the mechanical properties of the product by means of an optimum forming process and die profile. Forward extrusion and lateral extrusion were chosen as two different forming methods to manufacture a spur gear form.Four different die geometries were chosen for the forward extrusion; including straight tapered transition profile and cosine transition profile with having two different die lengths. Al 1070 was used as workpiece material in the experimental study. Experiments using five sets of dies with spur gear form were performed, and the measured forming load results were compared with the predictions of the finite element method for the same deformation situations by using DEFORM-3D. The state of stress and strain was also determined for two forming methods by means of DEFORM-3D. Finally, a series of fatigue tests were carried out for four teeth gear forms produced by both processes to evaluate influence of the forming processes

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Distributed System Resource Racing Conditions Automated Testing Method

Author(s): Robertas Jasaitis,Jonas Prapuolenis,Eduardas Bareiša / Language(s): English Issue: 4/2013

Most applications today are designed to be networked. It is natural that such applications operate on some data. Such applications are multi threaded by nature and it is a common situation when few clients are using the same application at the same time. So it is possible that those users operate with the same data. It is possible that in such an operation some data might be treated incorrectly or some client instance may operate on outdated data. In order to avoid such situations proper consistent testing should be performed. Therefore it is complicated to perform such testing manually. Automated tool which would help to solve this problem is wanted. In this paper we are presenting an automated testing method that is able to detect problems related to resource racing conditions in a distributed system.

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Breach of Personal Security through Applicative use of Online Social Networks

Author(s): Bojan Nikolovski,Vasko Kokolanski,Jugoslav Achkoski,Metodija Dojcinovski / Language(s): English Issue: 4/2013

Throughout this article there is an attempt to indicate the threats of potential to breach of personal security through applicative use of internet as well as applicative use of online social networks. In addition to many other ways of privacy protection applicative users of social network’s sites must take into considerations the risk of distributing private data. Through a series of actions and settings users can customize the security settings with the ultimate goal of reducing the risk of attack on their privacy

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Information Security Threats and Information Assurance

Author(s): Yildiray Yalman,Murat Yesilyurt / Language(s): English Issue: 3/2013

Today, the benefits of rapidly developing technology, as well as come to the fore the problems brought about. For this reason, individuals, institutions and organizations take measures to ensure the security of information. Information assurance is the practice of managing risks related to the use, processing, storage and transmission of information or data and the systems and processes used for those purposes. Thus, information security is now provided with information assurance measures. The presented work, especially in today's digital and networking technologies in order to ensure effective information security threats and describes the scope of what required for information assurance.

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Comparison of Programming Languages ASP (Commercial) and PHP (Open Source) while Designing Small/Typical Websites

Author(s): Mehmed Arnautović,Zlatko Bundalo / Language(s): English Issue: 3/2013

ASP and PHP are programming languages mostly used for creating websites. Unlike static HTML websites, ASP and PHP are used for creating dynamic websites and they enable interaction and exchange of information among users. User’s data is saved in the database. ASP (Active Server Pages) is a type of program that works with Microsoft and IIS (Internet Information Server). On the other hand, PHP or Hypertext Preprocessor works with Linux or Unix. PHP programs can run in Windows, Solaris, Unix and Linux, while ASP can run only on Windows based platforms. Here is represented a comparison between programming languages PHP and ASP, and results are from multiple websites

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Database Design for the Web Based University Project Management Information System

Author(s): Irena VALOVA / Language(s): English Issue: 2/2013

Web applications and particularly Web based Information Systems are very popular due to several reasons. The main reason is the ability to update and maintain them without distributing and installing software on thousand of client computers. This paper describes the main stages of the development process and mainly requirement analysis and database design. Such kind of system will provide students with the opportunity to choose among more projects, to work with different specialists in other conditions, in international teams, in different environments and to have more opportunities for their future professional realization.

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Neural Network Method for Person's Personality Recognition on the Face Image

Author(s): Alexandr Tropchenko,Andrey Tropchenko / Language(s): English Issue: 4/2012

This article examines the neural network methods to identify a person's identity on the face image used in biometric identification system.

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Lean Startup in Croatia - Does the Croatian Startup Scene Develop Effective Enterprises?

Author(s): Maja Lalić,Marina Klacmer Calopa,Jelena Horvat / Language(s): English Issue: 3/2012

In times of general business uncertainty, when the companies face challenges upon which their further existence depends, one of the reactions of the management board is influencing the processes which lead to a relatively quick decrease of expenses and general rationalization of the company's business. The method, or what many refer to as a management philosophy, which is recommended to be used in crisis periods, is the lean method. Having in mind the extremely volatile business environment, lean startup approach has raised to surface recently since it takes the basic principles from the lean production. Although it was primarily developed for technical domain, the lean startup approach to management is flexible, and can therefore be applied in every industry. It uses the experimental way of approaching the innovation cycle, as well as a continuously evaluated process of learning about the organization with the goal of rigorous and measurable validation of the development hypotheses for the new products and services. The lean startup approach tires to systematically and very precisely lead the entrepreneur in discovering the valuable parts of a business vision, and in rejecting the parts which are not realistically founded. This paper analyses the Croatian startup companies by using a customized questionnaire. Besides an overview of the companies' founding profiles, financing sources, the development phases of startup companies, business areas and metrics used by startup companies, as well as information sources, the research showed that the Croatian startup scene is familiar with the principles of lean startup methodology and it is successfully implementing it in business.

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Models of Irreversible Electroporation: A Review and Initial Model Implementation

Author(s): Tihomir Georgiev,Kristina Bliznakova,Zhivko Bliznakov,Georgi Todorov / Language(s): English Issue: 1/2024

Cancer may affect any person. Amongst possible techniques to treat some cancers is ablation, through the use of the irreversible electroporation (IRE) as one of the methods. Medical University of Varna is implementing a project on irreversible electroporation aiming to develop a hardware prototype. The first step is review of existing models and the development of an own model, which will be used in the device prototyping. To find the existing models, we reviewed articles related to electroporation models. Based on the literature review, we developed own model, where we used open-source software OpenEP and Embarcadero C++. The review of the available literature publications indicates that initial models employed a simplified cell structure. Despite this simplicity, these models effectively reflected important characteristics of the cell behaviour and the interdependencies between field features and cells. Recent investigations created better models and optimized parameters for specific cases. The review models were used in the development of dedicated software application for simulation, visualization, and educational purposes in the field of IRE. Developed software application allows investigation of various IRE protocols. Experimental investigation of implemented models and software is undergoing. The software will allow further advancement in our capacity to explore and comprehend cellular dynamics.

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Analysis of Requirements, Needs and Challenges Affecting the Development of the 6G Network

Author(s): Adin Čanić,Zlatko Jerković,Elma Avdagić-Golub / Language(s): English Issue: 1/2024

With the development and implementation of the 5G systems worldwide, the shortages and imperfections that limit the functions and services of 5G networks were made apparent. This generation should enable its users to access unseen services and applications and a better quality of service in comparison to its predecessors. However, aside from the apparent importance of 6G networks, the possibilities, use cases, applications, and services that this technology would provide are yet to be explored. Our intention with this paper is to research the papers and compare the differences in requirements, capabilities, services, and use cases between 5G and 6G.

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Performance Analysis of an Incremental Conductance MPPT Algorithm for Photovoltaic Systems Under Rapid Irradiance Changes

Author(s): Asnil Asnil,Refdinal Nazir,Krismadinata Krismadinata,Muhammad Nasir Sonni / Language(s): English Issue: 2/2024

The control algorithm for tracking the maximum power point (MPPT) is a crucial factor that influences the system's capacity to harness the maximum energy from the sun using photovoltaic. Incremental conductance stands out as one of the most commonly employed MPPT techniques due to its simplicity and low implementation complexity. However, it has various shortcomings, rendering it less effective in adapting to changing solar radiation conditions. Therefore, this study proposed a modification to enhance the algorithm's performance. The proposed modified algorithm is validated through experiments, revealing that the fastest tracking time for the adjusted incremental conductance algorithm was 72 ms, whereas the unmodified algorithm took 84 ms. Additionally, oscillations observed during changes in radiation values were 2 W and 1.66 W for the unmodified algorithm, occurring during decreases and increases in radiation values, respectively. In contrast, the proposed modified incremental conductance algorithm resulted in a consistent oscillation of 1.33 W for each change in radiation value.Furthermore, it can be concluded that the modified incremental conductance algorithm can increase the tracking time as well as reduce oscillations that occur under various conditions of changes in radiation values.

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Synchronization and Standardization of Open Data Platforms: A Systematic Literature Review

Author(s): Besart Hyseni,Lejla Abazi Bexheti / Language(s): English Issue: 2/2024

This study is a systematic review that intends to improve our knowledge of the ideas of open data synchronization and standardization by reviewing the methodology and instruments utilized in previous studies through a careful examination of accessible literature. The methodology of this study was developed in several key phases. Firstly, a search was conducted in electronic databases to identify relevant studies in the field for Open Government Data (OGD). After identifying the studies, they were carefully reviewed through an initial abstract-based screening process. In the next phase, the research design and sample used in each identified study were analyzed to assess their quality and reliability. Subsequently, data from the studies were analyzed and categorized into various categories, including the usability of open data, synchronization, scalability, and reliability. The gained results highlight the importance of open data in our information-driven society. Open data positively impact transparency, anti-corruption efforts, and free access to information. To achieve these benefits, it is crucial to standardize and license open data, giving priority to their usability. The study underscores the importance of open data for transparency, innovation, and citizen engagement. Despite the disadvantages, this technology has the potential to change how governments and society use data.

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The Development of Esports Research and Technology in the Last 3 Decades

Author(s): Muchamad Arif Al Ardha,Nurhasan Nurhasan,Mochamad Ridwan,Andhega Wijaya,Mohammed Fatkoer Rohman,Nur Salsabila Rhesa Pandhadha Putra,Sauqi Sawa Bikalawan Bikalawan,Jordan Agung Mubarak,Kukuh Pambuka Putra,Chung Bing Yang / Language(s): English Issue: 2/2024

This study aims to analyze and evaluate the research and technology developments of esports in the last 30 years. 1188 Scopus articles were analyzed using VOS viewer computer software. The literature review was analyzed systematically following PRISMA guidelines. The analysis results show computer science, social sciences, and medicine are the fields of study most often associated with esports. The keywords "Esports" and "Human" are the main focus, indicating attention to the interaction between users and technology in gaming. In conclusion, esports have become more than just a game, but a complex social and technological phenomenon with broad impacts.

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