cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
I Made Wicaksana Ekaputra
Contact Email
made@usd.ac.id
Phone
+62274883037
Journal Mail Official
editorial.ijasst@usd.ac.id
Editorial Address
Kampus III Universitas Sanata Dharma, Paingan, Maguwoharjo, Depok, Yogyakarta
Location
Kab. sleman,
Daerah istimewa yogyakarta
INDONESIA
International Journal of Applied Sciences and Smart Technologies
Published by Universitas Sanata Dharma
ISSN : 26558564     EISSN : 26859432     DOI : http://dx.doi.org/10.24071/ijasst
Core Subject : Science, Engineering,
Computer Science & IT Energy Engineering Industrial & Manufacturing Engineering
International Journal of Applied Sciences and Smart Technologies (IJASST) is published by Faculty of Science and Technology, Sanata Dharma University Yogyakarta-Central Java-Indonesia. IJASST is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in engineering, science, technology, and basic sciences which relate to technology including applied mathematics, physics, and chemistry. IJASST accepts submission from all over the world, especially from Indonesia.
Arjuna Subject : Umum - Umum
Articles 9 Documents
 1 
Search results for , issue "Volume 04, Issue 01, June 2022" : 9 Documents clear
Characteristics of Wooden Furniture Drying Machine Petrus Kanisius Purwadi; A. Prasetyadi
International Journal of Applied Sciences and Smart Technologies Volume 04, Issue 01, June 2022
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v4i1.4755

Abstract

This study aims to determine the characteristics of the electric energy drying machine used to dry wooden furniture. Furniture made of mahogany. The research was conducted experimentally in the wood furniture industry. The size of the wood drying room is 8 m x 6 m x 3 m. The dryer works with a vapor compression cycle using R134a freon and several fans placed in the drying chamber. The drying process uses a closed air system. The total volume of dried wooden furniture is 12.9 m3. The initial moisture content in the wood ranges from 18% to 23%. Wooden furniture is considered dry if the moisture content in the wood furniture is less than 12%. Research gives satisfactory results. The performance of the drying machine or COP is 10.85. The drying time for wooden furniture is about 72 hours.
Cryptocurrencies Advantages and Disadvantages: A Review Shadi Khaled Zakarneh; Zaer Qaroush; Ammar Dawabsheh
International Journal of Applied Sciences and Smart Technologies Volume 04, Issue 01, June 2022
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v4i1.4610

Abstract

Abstract. With the rapid spread of technology in all sectors of life and the necessary need to increase the speed of payment processes, confidentiality, and privacy in business operations, cryptocurrencies appeared. The cryptocurrency is a virtual and intangible currency, in which transactions are made through the Internet and without any physical exchange between parties. These currencies are characterized by decentralization, transparency, privacy. Because transactions are carried out through a cryptography process and depend on Blockchain technology it is highly protected. Blockchain generally is a distributed ledger or a decentralized database. The Blockchain architecture combines advanced cryptography, distributed consensus mechanisms, and a complex system of incentives and rewards. In cryptocurrency, transactions are created, transferred, and verified through an integrated process called mining. Network members (network nodes) who carry out verification processes of transactions are called miners. As it is a credit or debit card used in banking transactions, in cryptocurrencies there is a so-called electronic wallet that is used for transactions that take place on cryptocurrencies over the Internet through computers or smartphones. Blockchain technology architecture has given cryptocurrencies many advantages and features that increase its strength and distinction from regular currencies and regular financial transactions such as decentralization, high confidentiality, anonymity, speed of transactions, very low fees, unlimited number of transactions, unrestricted by geography and borders, transparency, protection from Inflation, and the peer-to-peer network. The misuse of powerful features in cryptocurrencies and Blockchain technology has led to many disadvantages such as the risks of lack of knowledge, the lack of wide acceptance, the high risk of investing in them, its volatile nature, and the inability to return missing payments. This study concentrates on cryptocurrencies in terms of advantages and disadvantages.
Shrinkage of Biocomposite Material Specimens [HA/Bioplastic/Serisin] Printed using a 3D Printer using the Taguchi Method Felix Krisna Aji Nugraha
International Journal of Applied Sciences and Smart Technologies Volume 04, Issue 01, June 2022
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v4i1.4205

Abstract

The Fused Deposition Modeling method in the rapid prototyping technique was modified using a paste-shaped material with biocomposite material. One of the correction factors for the printed test specimen results is shrinkage. The paste material used is hydroxyapatite [CA5(PO4)6(OH)2] and tapioca bioplastic is one of the biomaterials that has been widely used in tissue engineering. Besides these materials, sericin is added, which is produced from extracts from silkworm cocoons.The composition of the biocomposite paste used with the ratio of hydroxy apatite and bioplastic was 40:50, 50:50, 60:40, by adding 0.3% sericin to the hydroxyapatite solution. The parameters used in the printing process of the test specimens are the perimeter speed of 60 mm/s, the infill speed of 10 mm/s, and the layer height of 0.45 mm. The design in this test has dimensions of 100mm long, 25mm wide, and 3mm thick. The optimal shrinkage of the test specimens was analyzed using the Taguchi . methodSpecimen printing is done by using additive manufacturing method. The process is carried out using a Portabee three-dimensional printing machine that uses a Fused Deposition Modeling (FDM) system modified to an Aqueous-Based Extrusion Fabrication (ABEF) system. The size of the printed test specimens with dimensions of 100mm long, 25mm wide, and 3mm thick. The comparison of the biocomposite materials used in the composition of hydroxyapatite suspension paste and tapioca starch bioplastics ranged from 40:50, 50:50, 60:40, with the addition of 0.3% sericin hydroxyapatite suspension. The optimal composition of the bioplastic material was analyzed using the method. Taguchi.The results obtained that the optimum composition for shrinkage of the hydroxyapatite and bioplastic compositions was 50:50 with the addition of 0.3% sericin to the hydroxyapatite solution
Impact of Online Education and Sentiment Analysis from Twitter Data using Topic Modeling Algorithms Sulochana Devi; Chhaya Dhaval; Lalita Moharkar; Sushama Khanvilkar
International Journal of Applied Sciences and Smart Technologies Volume 04, Issue 01, June 2022
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v4i1.4637

Abstract

During a pandemic, all industries suffer greatly, and every sector of the world suffers in some way, including the education sector. Internet expressions reflect users' feelings about a product or service. The polarity of information in source data toward a subject under investigation is determined by sentiment analysis processes. The goal of this study is to examine social media expressions about online teaching and learning, as online education will become a part of everyday life in the future. We collected data from Twitter using keywords related to online education and Google form from engineering undergraduate students for prototype implementation. This analysis will assist teachers, parents, and the student community in understanding the benefits and drawbacks of the education industry, allowing for further improvement in educational outcomes. We used aspect-based sentiment analysis and topic modeling to determine sentiment polarity and important topics for education sector stakeholders. To begin, we used TextBlob Python package to determine sentiment polarity, and Bag of Words, LDA and LSA model for discovering topics. After modeling topics from the collected data, topic Coherence is used to assess the degree of semantic similarity between high-scoring words in the topic. The word cloud and LDAvis are used to visualize data. The experimental results are promising and it will assist education stakeholders in addressing the concerns that have been identified as social media expressions to work on.
Comparison of Static Signature Identification using Artificial Neural Networks Based on Haar, Daubechies and Symlets Wavelet Transformations Rosalia Arum Kumalasanti
International Journal of Applied Sciences and Smart Technologies Volume 04, Issue 01, June 2022
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v4i1.4786

Abstract

. Signature is a biometric attribute that is quite important for each individual that can be used as self-identity. Until now, the signature is still used as a sign of legal approval and is agreed upon by everyone. This makes the signature worthy of attention from a security aspect. Various approaches have been proposed in the development of signature identification to minimize signature forgery. This study will discuss the identification of signatures by using the image of the signature on paper. This identification consists of two processes, namely training and testing by utilizing Artificial Neural Networks Backpropagation and Wavelet Transform. Optimal results are obtained by using ANN which has learning rate 0,09, two hidden layers, each 20 and 10 nodes with the most superior Wavelet Haar reaching 94.44% Keywords: Signature, ANN, Identification, Backpropagation, Wavelet
Determining the Coefficient of Restitution Through the “Bouncing Ball” Experiment using Phyphox Jesi Pebralia
International Journal of Applied Sciences and Smart Technologies Volume 04, Issue 01, June 2022
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v4i1.4548

Abstract

This study aims to determine the restitution coefficient based on the reflected sound from the “bouncing ball” experiment. The experiment used a Phyphox-based smartphone. The produced sound came from a reflection between marble and the floor. Theoretically, the value of the coefficient of restitution is obtained based on the square root of the final height of the object’s reflection divided by its initial height. In this study, the determination of the height of the bounce from the “bouncing ball” was measured using the Phyphox application, which was analyzed based on the sound of the bouncing ball and the time interval of the reflection. The results show that the value of the coefficient of restitution for each marble was 0.93, 0.92, and 0.92, while the average error was 0.65%, 0.85%, and 1.43%, respectively. Furthermore, the average error value of the overall measurement is 0.97%. This error is highly dependent on the shape of the object. The rounder a thing is, the higher the level of accuracy will be. In this study, the determination of the coefficient of restitution was carried out in two ways: by comparing the height of the ball’s bounce and the time intervals for the n and n+1 bounce. The value of the coefficient of restitution generated by these methods was identic. Thus, this study had confirmed that the bounce ball experiment using the Phyphox indicated valid data well so that it could be implemented for determining the coefficient of restitution.Keywords: Bouncing ball, Coefficient of restitution, Phyphox, Smartphone
The influence of artificial aging on tensile properties of Al 6061-T4 Freddy Saputra Romamti-Ezer Taebenu; Heryoga Winarbawa; Rines Rines; Budi Setyahandana; I Made Wicaksana Ekaputra
International Journal of Applied Sciences and Smart Technologies Volume 04, Issue 01, June 2022
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v4i1.4816

Abstract

This paper presents an explanation related to experimental testing in the form of the tensile properties of Al 6061. Al 6061 was heat treated by the precipitation hardening method. The precipitation hardening consisted of T4 and T6 treatment. Al 6061 samples were heat-treated at a temperature of 430°C for 2 hours, then cooled slowly at room temperature. The T4 was conducted at a temperature of 530°C for 2 hours, followed by rapid cooling in a water medium and natural ageing at a temperature of 70°C for six days. Temperature T6 is the final process of applying precipitation hardening treatment to Al 6061. Temperature T6 is carried out at 530°C for 2 hours, then cooled rapidly in a water medium and continued with artificial ageing at 190°C with a variation of ageing time for 3 hours, 5 hours, and 7 hours. The effect of the applied treatment was observed to increase the maximum strength value of the tensile test of Al 6061.
Weft Computation of Endek Weaving Nyoman Dewi Pebryani; Putu Manik Prihatini; Tjok Istri Ratna C.S
International Journal of Applied Sciences and Smart Technologies Volume 04, Issue 01, June 2022
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v4i1.4666

Abstract

Endek is a textile produces in Bali with a single ikat technique, specifically weft ikat. Weft ikat means that the pattern is created or drawn on the weft threads before ikat or tying process. The weft threads are transferred into a frame; a frame consists of tens to hundreds of bundles or called traditionally as bulih. Drawing a pattern on a frame requires special expertise as the pattern maker has to translate a two-dimensional pattern into a shape that is distorted on the wide side. Indirectly, this special requirement confines the pattern maker as they have to visualize a distortion shape to be able to draw in the frame. To provide easiness in design exploration, providing various templates and multiplier to automatically distort the template are substantial. Therefore, understanding the manual process on site is important before simulating the formula of weft computation including are templates and multiplier. With this computation, the pattern makers or anyone who has an enthusiast in designing Endek patterns may involve in the design process.
The Effect of Motor Parameters on the Induction Motor Speed Sensorless Control System using Luenberger Observer Bernadeta Wuri Harini
International Journal of Applied Sciences and Smart Technologies Volume 04, Issue 01, June 2022
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v4i1.4518

Abstract

The sensorless control system is a control system without a controlled variable sensor.  The controlled variable is estimated using an observer. In this investigation, the sensorless control system is used to control induction motor speed.  The observer that is used is the Luenberger observer.  One of the drawbacks of the sensorless control system is precision motor parameter values. In this research, the effect of induction motor parameters in a speed sensorless control system, i.e. resistance and inductance motor, will be investigated.  The differences in induction motor parameters between the controller and the actual value affect the system response. The value differences of Rr and Rs that can be applied are a maximum of 50%. However, the small differences in the inductance value greatly affect the system response. To get a good response, the value differences of Ls and Lr are between -5% to +5%, while the difference in the value of Lm is between -3% to +3%.

Page 1 of 1 | Total Record : 9

 1 

Filter by Year

2022 2022


Reset
Filter By Issues
All Issue Volume 07, Issue 2, December 2025 Volume 07, Issue 1, June 2025 Volume 06, Issue 2, December 2024 Volume 06, Issue 1, June 2024 Volume 05, Issue 02, December 2023 Volume 05, Issue 01, June 2023 Volume 04, Issue 02, December 2022 Volume 04, Issue 01, June 2022 Volume 03, Issue 02, December 2021 Volume 03, Issue 01, June 2021 Volume 02, Issue 02, December 2020 Volume 02, Issue 01, Juni 2020 Volume 02, Issue 01, June 2020 Volume 01, Issue 02, December 2019 Volume 01, Issue 01, June 2019 More Issue