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All Journal Jurnal Pengajaran Matematika dan Ilmu Pengetahuan Alam The Journal of Pure and Applied Chemistry Research Journal of Mechanical Engineering Education (Jurnal Pendidikan Teknik Mesin) IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Science and Technology Indonesia Jurnal Penelitian Sains IJEMS (Indonesian Journal of Environmental Management and Sustainability) VISI : Jurnal Ilmiah Pendidik dan Tenaga Kependidikan Pendidikan Non Formal Journal of Educational Research and Evaluation International Journal of Community Service Learning Molekul: Jurnal Ilmiah Kimia Edsence: Jurnal Pendidikan Multimedia Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Jurnal Abdi Insani Jurnal Paedagogy Jurnal Teknik Industri Terintegrasi (JUTIN) International Journal of Sustainable Transportation Technology Jurnal Pengabdian kepada Masyarakat Nusantara Jurnal Kependidikan: Jurnal Hasil Penelitian dan Kajian Kepustakaan di Bidang Pendidikan, Pengajaran dan Pembelajaran Jurnal Abmas Jurnal Industri dan Teknologi Samawa (JITSA) Jurnal Insinyur Profesional Jurnal Pepadu Jurnal Guru Komputer Jurnal Ilmiah Sistem Informasi
Dedi Rohendi
Universitas Pendidikan Indonesia
Religion Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Transportation Other

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Biodegradable Plastics: Biodegradation Percentage and Potential Microplastic Contamination in Seawater Permana, Muhammad Aditya; Widjajanti, Hary; Rohendi, Dedi
Indonesian Journal of Environmental Management and Sustainability Vol. 7 No. 2 (2023): June
Publisher : Magister Program of Material Science, Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijems.2023.7.2.74-79

Abstract

Increasing plastic production, which causes the problem of plastic garbage polluting the oceans, has increased the use of biodegradable plastics to address the problem. However, it is still debatable how much microplastic contamination it can cause. So, this study aims to determine the proportion of biodegradable plastics in the marine environment, identify the microplastics it produces, and analyze the relationship between the two. Seawater sampling is located in the Bangka Strait. The research was conducted in the Genetics and Biotechnology Laboratory, Department of Biology, Sriwijaya University. The biodegradable plastic test material used was made from a mixture of polyhydroxyalkanoates (PHA) and starch. Biodegradation test method using standard ASTM D6691-17 with respirometry system design. The stage of microplastic identification is carried out through filtration with a 4.75 mm-size filter; density separation using ZnCl2 solution and Whatman No. 1 filter paper; as well as visual observation of microplastics under a microscope. last Pearson Correlation analysis with bootstrap to see the relationship of the percentage of biodegradation with microplastics. The results obtained in this study were the percentage of biodegradable plastic (26.5±1.4%) and positive control kraft paper (33.2±4.2%) for 70 days, which produced 9 microplastic particles from biodegradable plastic with fragment and film types. Correlation analysis concluded that there was no relationship between the percentage of biodegradation and the microplastics produced.
Attracting International Students' Interest in Mobility and Advanced Study Programs in Indonesia: Case Study of Malaysian Vocational Education Students Rohendi, Dedi; Kuntadi, Iwa; Suryadi, Dedy; Ana; Muktiarni; Hanapi, Zaliza; Ramadhan, Muhammad Oka; Iskandar, Naufal Nadhif Rabbani
International Journal of Community Service Learning Vol. 8 No. 4 (2024): November
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/ijcsl.v8i4.84809

Abstract

In the context of the global economy, the importance of international exposure for vocational students cannot be overstated. Indonesia, with its abundant educational resources and cultural richness, has yet to tap its potential as a leading destination for international students. This study examines the development and impact of a socialization program to increase Malaysian vocational students’ interest in mobility programs and further study in Indonesia. The participants in this study were university students. Data collection was conducted through an online survey using a pretest and posttest questionnaire instrument. Data were analyzed using the Wilcoxon test to test the hypothesis that there is a significant positive change in student interest and the N-Gain value to determine the magnitude of the increase in interest. The results showed a moderate increase in interest, confirming the important role of prior knowledge and institutional image in the decision-making process. These findings suggest that Indonesian universities need to increase their global visibility through strategic marketing and international collaboration. The implications of this study provide important insights for policymakers, higher education institutions, and other stakeholders in increasing Indonesia’s attractiveness as an educational destination for international students, especially from Malaysia.
Augmented Reality in Vocational Education : Trend, Acquired Skills, and Future Work Ramadhan, Muhammad Oka; Rohendi, Dedi; Handayani, Mustika Nuramalia; Abdullah, Ade Gaffar; Koehler, Thomas
Jurnal Kependidikan: Jurnal Hasil Penelitian dan Kajian Kepustakaan di Bidang Pendidikan, Pengajaran dan Pembelajaran Vol 10, No 4 (2024): December
Publisher : Universitas Pendidikan Mandalika (UNDIKMA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/jk.v10i4.12875

Abstract

This study aims to explore the role of Augmented Reality (AR) in enhancing practical skills within vocational education, particularly in response to the evolving needs of the educational sector. Through a bibliometric analysis and comprehensive literature review, this research examines trends in AR research from 2003 to 2023. The study focuses on publication growth, citation impact, research focus, and subject area. The research method used includes bibliometric analysis and systematic literature review, with data visualized through tools like VOSviewer and Tableau. Data were collected from various academic databases, examining the distribution of publications, research impact, and citation patterns over the years. Data were analyzed using quantitative and cluster analysis to categorize research trends into six clusters: industrial architecture, biomedical surgery, product development, learning methods, AR's positive impact, and acquired skills. The study results showed that AR has a positive impact on several skill sets but may occasionally hinder others. The research also reveals that while AR applications are gaining momentum, certain areas such as Agricultural and Biological Sciences, Economics, and Nursing remain largely unexplored. This review highlights the importance of advancing AR in untouched fields and emphasizes the need for further investigation into the systematic assessment of skills acquired through AR, making this study vital for educational technology, vocational instructors, and institutions aiming to implement AR technologies effectively.
The Kemampuan Guru SMK Mengimplementasikan Artificial Intelligence dalam Perangkat Ajar Kamin Sumardi; Dedi Rohendi; Saripudin Saripudin; Muhammad Oka Ramadhan
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 6 No. 1 (2024): Jurnal Pengabdian kepada Masyarakat Nusantara (JPkMN) Edisi September - Desembe
Publisher : Cv. Utility Project Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The implementation of the Merdeka Curriculum prioritizes a differentiated approach in its learning process. Differentiation is clearly achieved by grouping students' learning outcomes based on their growth phases. The Merdeka Curriculum accommodates six phases: Phase A, B, C, D, E, and F. These phases are designed to build effective learning and achieve learning objectives in a timely manner. Effective learning must be supported by high-quality teaching materials, which in turn will support efficient learning time, active student engagement, and quality education. Artificial Intelligence (AI technology can assist teachers in creating good and high-quality teaching materials. This community service activity employs an in-house training method with persuasive, collaborative, and participatory approaches. The training was conducted over two days, on Friday and Saturday, July 19-20, 2024, at SMKN 1 Cinangka, Serang Regency, Banten. The materials covered included creating e-modules and scientific papers with the help of AI. The training was attended by 55 participants. The results of the training indicate that, on average, 69% of vocational school teachers already have knowledge about AI, 57% have an understanding of AI, and 69% have implemented AI in their teaching materials. Overall, the training results show that 65% of the participants have acquired basic skills in creating e-modules and scientific papers with the help of AI. Therefore, com\munity service through AI training is very much needed by vocational school teachers.
Analisis Kinerja Manajemen Persediaan pada Perusahaan Danone Steven Julianto Situmeang; Dedi Rohendi; Hanissa Okitasari
Jurnal Industri dan Teknologi Samawa Vol 6 No 1 (2025): EDISI 11
Publisher : Program Studi Teknik Industri Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/jitsa.v6i1.5362

Abstract

Inventory is one of the important aspects of a company's operations, especially in meeting consumer needs efficiently. However, suboptimal inventory management can lead to excess or shortage of stock that has an impact on the company's performance. This research was conducted on DANONE, a multinational company that produces food and beverages and operates in 130 countries. This study aims to measure the company's inventory management performance in the last two years using the inventory turnover, days inventory, and inventory to revenue methods. The results show that DANONE's inventory management performance is relatively low, with a decrease in inventory turnover from 6.44 in December 2021 to 3.07 in June 2022. This decline indicates a slowdown in sales and overstock as the main problem. The conclusions of this study show the need to improve inventory management in order to increase efficiency and support the achievement of company goals.
Mathematics as Determinant of Students’ HOTS Among HND Electrical and Electronic Engineering Students in Ghana Oduro-Okyireh, Theodore; Mulyanti, Budi; Rohendi, Dedi; Acheampong, Kennedy; Oduro-Okyireh, George
Journal of Education Reseach and Evaluation Vol 7 No 4 (2023): November
Publisher : LPPM Undiksha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jere.v7i4.62932

Abstract

One crucial component of education is developing higher-order thinking skills (HOTS). The aim of this study is to analyze mathematics as determinant of students’ HOTS among HND electrical and electronic engineering student in Ghana. The test format tool used had two indicators, critical and creative thinking, and the subjects for the research were 488 electrical and electronic engineering students from 4 randomly selected Technical Universities in Ghana. The Cronbach Alpha reliability test was performed, and the Pearson test was used to assess the validity of the MAT instrument. Data were processed and analysed using SPSS version 26.0 software. Multiple regression was used as the estimation technique, and the results show a positive high correlation between HOTS and probability (0.757), and positive moderate correlations for algebra (0.669), functions (0.633), trigonometry and complex numbers (0.604), and calculus and differential equations (0.572). These statistics suggest that the level of understanding of mathematics concepts, particularly probability, can determine HOTS. The study's implication is that engineering mathematics curriculum developers should stress the practical applications of mathematics, especially probability in everyday life and offer opportunities for students to use their mathematical knowledge to solve real-world problems in order to develop HOTS.
Thermogravimetric Analysis of EFB and Palm Shells as Gasification Fuels: Kinetic and Activation Energy Study Komala, Ria; Rohendi, Dedi; Gulo, Fakhili; Faizal, Muhammad
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 1 (2025): February 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i1.37

Abstract

Solid waste from palm oil industry such as EFB and palm kernel shells pose environmental challenges if not properly managed. This study investigated the thermal characteristics and decomposition kinetics of EFB and palm kernel shells through proximate analysis and thermogravimetric analysis (TGA). The results indicate that palm kernel shells have a greater fixed carbon content (21.03–21.35%) than does EFB (19.60–20.06%), whereas EFB has a greater ash content (4.74–5.38%) than does palm kernel shells (1.25–1.31%). EFB showed a weight loss of 94.67% after 233.33 minutes of heating, whereas it was 99% for the palm kernel shells. The peak temperatures reached were 936.67 °C for the EFB and 930 °C for the palm kernel shells. At 600°C, EFB produced more syngas than palm kernel shells did. The calculated activation energies were 4482.19 J/mol for EFB and 4484.97 J/mol for palm kernel shells. This research enhances the understanding of the gasification efficiency of these materials, aiding in the optimization of eco-friendly energy production.Keywords: Empty fruit bunches, palm kernel shells, activation energy, thermogravimetric analysis, gasification
PENGEMBANGAN MULTIMEDIA PEMBELAJARAN BERBASIS AUGMENTED REALITY Rohendi, Dedi; Daryanto, Eka; Siregar, Batu Mahadi
Jurnal Insinyur Profesional Vol. 3 No. 2 (2023): Jurnal Insinyur Profesional Vol 3 No 1
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jip.v3i1.42488

Abstract

Many subjects in engineering are abstract, not only in theoritical concepts but also in practices. This causes difficulties for students in understanding the material. Especially if the availability of practical tools is limited. Therefore we need media that can help students learn abstract material to be more real amidst the limitations of existing practical tools. Multimedia is a technology that is used in various fields, also in the education field. Multimedia has advantages such as being able to simulate, sound, move, video, and others and can be used as a learning aid. Multimedia based on Augmented Reality (AR) is an alternative solution to solve the students problems in learning. The aims of this research is to develop multimedia based on Augmented Reality. This research method is ADDIE. The multimedia development process begins with analysis, design, development, limited implementation and evaluation. The result of this AR-based multimedia development process is that multimedia products have been declared feasible, both in terms of material and multimedia.
PELATIHAN PEMBUATAN LULUR WAJAH DARI DAUN SIRSAK (Annona Muricata L) UNTUK MENDAPATKAN KULIT SEHAT DI DESA TANJUNG ATAP Hariani, Poedji Loekitowati; Fatma, Fatma; Said, Muhammad; Ahadito, Bijak Riyandi; Rohendi, Dedi
Jurnal Pepadu Vol 6 No 1 (2025): Jurnal Pepadu
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/pepadu.v6i1.6149

Abstract

Facial scrubs are a part of skin care that is often done by mothers and young women. In line with back to nature awareness, body scrubs use ingredients from natural sources. This community service activity aims to provide counseling and training on the importance of skin care and making facial scrubs from soursop leaves. Soursop leaves contain bioactive ingredients which are antioxidant and antibacterial. The activity was carried out in Tanjung Atap village, Tanjung Batu sub-district, Ogan Ilir district and was attended by 26 participants. The soursop plant is easy to find in the village growing in the yard. Activity participants play an active role in activities both in counseling and training. Evaluations are carried out before and after the activity to determine the level of participants' understanding of the counseling and training provided. Apart from that, an organoleptic test was carried out to determine the level of acceptance of the body scrub product. The results of the activity showed that there was an increase in public understanding of the importance of maintaining healthy skin and making body scrubs from soursop leaves. The increase in participants' understanding was 93.03% from not understanding or not understanding. The organoleptic test results showed that 85.36% of participants said they really liked it and 14.64% said they liked the facial scrub product made from soursop leaves. With this service activity, people are increasingly aware of the importance of skin care using natural resources. Scrubs made from natural ingredients are safe, cheap and avoid the side effects of chemicals.
Simulasi Pembangkit Listrik Proton Exchange Membrane Fuel Cell (PEMFC) untuk Kebutuhan Daya Rumah 1000 Watt Jefri, Jefri; Rohendi, Dedi; Barlin, Barlin; Assaidah, Assaidah
Jurnal Penelitian Sains Vol 26, No 2 (2024)
Publisher : Faculty of Mathtmatics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56064/jps.v26i2.986

Abstract

Penelitian ini menyajikan simulasi pembangkit listrik Proton Exchange Membrane Fuel Cell(PEMFC) untuk perumahan, mempertimbangkan 100 rumah masing-masing membutuhkan 1000 watt pada tegangan 220 V. Simulasi menunjukkan bahwa untuk mencapai kapasitas daya ini, diperlukan pasokan gas hidrogen sebesar 1609,29, 1514,76, dan 1484,94 gram per jam pada tekanan 1, 2, dan 3 atm. Kondisi optimal terjadi pada suhu 333K (60C) dan tekanan 3 atm dengan efisiensi 30,72%. Tegangan keluaran optimal adalah 0,56 V menggunakan 393 sel, mendekati 220 V yang ditargetkan. Hasil sampingan berupa air dan panas masing-masing rata-rata 359,62 watt dan 0,0020 mL/jam. Asumsi pengeluaran bulanan mencapai Rp. 17.237.929, sehingga dibutuhkan konsep yang lebih efisien untuk hasil yang lebih ekonomis. Penelitian ini memberikan wawasan tentang kelayakan dan optimasi pembangkit listrik berbasis PEMFC untuk aplikasi perumahan.
Co-Authors ACHEAMPONG, KENNEDY Addy Rachmat Ade Gafar Abdullah, Ade Gafar Ade Gaffar Abdullah, Ade Gaffar Adelia, Ory Adhiyanti, Nurmalina Aip Saripudin Aldes Lesbani Amelia, Icha Ana Arrumaisha, Nissa Asep Yudi Permana Assaidah, Assaidah Barlin Barlin Bijak Riyandi Ahadito Budhi Setiawan Budi Mulyanti Dedy Suryadi Dewi, Claudia Edy Herianto Majlan, Edy Herianto Eka Daryanto, Eka Fakhili Gulo Fatma Fatmawati Fatmawati Fauzan, Mochamad Patra Bani Fauzan, Mochamad Rizal Felicity, Felicity Gigin Gantini Putri Hanapi, Zaliza Hanissa Okitasari Hanissa Okitasari Hary Widjajanti Heri Sutarno Hikmawan, Rizki Iskandar, Naufal Nadhif Rabbani Iwa Kuntadi Jefri Jefri Kamin Suamrdi Kamin Sumardi Kamin Sumardi Koehler, Thomas Larutama, Wiku Menik Setyowati Mokhamad Syaom Barliana Muhammad Adli Rizqulloh Muhammad Dzulfikar A Muhammad Faizal Muhammad Oka Ramadhan Muhammad Said MUHAMMAD SAID Muktiarni Mustika Nuramalia Handayani Nirwan Syarif Nirwan Syarif, Nirwan Normah Normah, Normah Nugraha, Agri Triya Oduro-Okyireh, George Oduro-Okyireh, Theodore Permana, Muhammad Aditya Poedji Loekitowati Hariani Pramudita, Resa Purnawan Purnawan Rahmah, Dea Ramadhan, Muhammad Oka Rasim, R Ria Komala Risfidian Mohadi Roer Eka Pawinanto, Roer Eka Salni Septiadi, Jaka Shandyka, Muhammad Fajar Siregar, Batu Mahadi Sri Haryati Steven Julianto Situmeang Subarna, Bambang Sudarsono, Wulandari Sya'baniah, Nyimas Sya'baniah, Nyimas Syabaniah, Nyimas Febrika Syarif, Nirwan Syarif, Nirwan Syarif, Nirwan Syarif, Nirwan Sya’baniah, Nyimas Febrika Tarmizi Taher Tri Kurnia Dewi Wong, Wai Yulianti, Dwi Yulianti, Dwi Hawa Yulinar Adnan Zainal Fanani