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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 PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat 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 Pembelajaran, Bimbingan, dan Pengelolaan Pendidikan Jurnal Industri dan Teknologi Samawa (JITSA) Jurnal Insinyur Profesional Jurnal Riset Rumpun Ilmu Teknik (JURRITEK) Jurnal Pepadu Information Technology Education Journal Jurnal Guru Komputer Jurnal Ilmiah Sistem Informasi Jurnal Abmas Open Access DRIVERset ABDINE :Jurnal Pengabdian Masyarakat
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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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.
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.
Identifikasi Waste Melalui Pendekatan Lean Logistics Pada Aktivitas Distribusi Material PT XYZ Fauzan, Mochamad Patra Bani; Rohendi, Dedi; Larutama, Wiku
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 8 No. 3 (2025): July
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v8i3.47047

Abstract

Inefficient material distribution at PT XYZ causes production delays in tactical vehicles and increases operational costs. This study aims to identify waste in the material distribution process using the Lean Logistics approach with the help of Value Stream Mapping (VSM) and Process Activity Mapping (PAM) tools. The analysis shows that out of a total distribution time of 6,835 minutes, only 273 minutes (4%) are value-added (VA) activities, while the remainder consists of non-value added (NVA) and necessary non-value added (NNVA) activities. These findings highlight the dominance of wasted time due to delays, transportation, and inefficient storage. The study recommends continuous improvement through lean tools and the implementation of digital technologies to accelerate distribution flow and reduce waste. This approach can enhance overall logistics efficiency and company productivity.
Investigation of Mixed MeOH:EtOH Ratio and Air Supply on MEA Performance in Direct Alcohol Fuel Cell (DAFC) Yulianti, Dwi Hawa; Rohendi, Dedi; Majlan, Edy Herianto; Rachmat, Addy; Sya’baniah, Nyimas Febrika
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1012-1019

Abstract

Methanol (MeOH) and ethanol (EtOH) are commonly used fuels in Direct Alcohol Fuel Cells (DAFC). The advantages of these two fuels are influenced by electrochemical reactions centered around the Membrane Electrode Assembly (MEA). In this study, Pt/C catalyst was used on the cathode and Pt-Ru/C on the anode, with catalyst loadings of 2, 4, 6, 8, and 10 mg/cm2. The anode and cathode were characterized using Cyclic Voltammetry (CV), while the conductivity properties were evaluated through Electrochemical Impedance Spectroscopy (EIS). The Open Circuit Voltage (OCV) of the MEA in a single DAFC cell reached 0.65 V, with the highest value observed at a MeOH:EtOH volume ratio of 70:30 at concentrations of 3 M for MeOH and 2 M for EtOH. In addition to oxidation at the anode, oxygen reduction plays a significant role in the MEA performance on the cathode side. The oxygen supply to the cathode increased the power density by 52.17% at the optimal blower voltage of 5 V.
Designing AI-Based Learning Assistant to Elevate Computational Thinking: A UX-Focused Redesign Approach Hikmawan, Rizki; Rohendi, Dedi; Septiadi, Jaka; Arrumaisha, Nissa
Jurnal Paedagogy Vol. 12 No. 4 (2025): October
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/jp.v12i4.16705

Abstract

This study aims to evaluate and enhance the User Experience (UX) of SEKAPAI, a web-based AI learning assistant developed to support Computational Thinking (CT) development. The initial version was assessed using Cognitive Walkthrough, System Usability Scale (SUS), and User Experience Questionnaire (UEQ), involving ten participants. Data collected from these instruments were analyzed using descriptive statistics to quantify usability scores, and qualitative feedback from the walkthroughs was subjected to thematic analysis to identify pain points. The preliminary results showed a success rate of 90%, but also revealed issues in clarity and feature navigation. Based on user feedback, the platform underwent a redesign process guided by User-Centered Design (UCD) stages, resulting in improvements in structure, interaction flow, and interface clarity. The updated prototype showed clear improvements, supported by Maze testing with a UX score of 80 ('Good') and a SUS increase to 86 ('Excellent'), and the task success rate improved to 97.14%, indicating a significant enhancement in user satisfaction and efficiency. This study not only validates the effectiveness of UCD in refining AI-based learning tools but also highlights the potential for future system development. These findings contribute to the design methodology of intelligent educational systems by aligning pedagogical goals with interactive design strategies.
Rancang Bangun Sistem Informasi Pergudangan Berbasis Mobile Menggunakan Metode Waterfall PT KAI Shandyka, Muhammad Fajar; Dedi Rohendi; Hanissa Okitasari
Jurnal Ilmiah Sistem Informasi (JISI) Vol. 4 No. 2 (2025): OKTOBER
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/jisi.v4i2.10316

Abstract

PT Kereta Api Indonesia (Persero) menghadapi tantangan efisiensi dalam manajemen gudang persediaan akibat proses yang masih manual menggunakan kartu barang fisik, sehingga pencarian material menjadi lambat dan rentan terhadap kesalahan. Penelitian ini berfokus pada perancangan dan pengembangan sistem informasi pergudangan berbasis mobile untuk membantu meningkatkan akurasi dan efisiensi proses tersebut. Metode Waterfall digunakan dalam pengembangan sistem yang mencakup tahapan analisis, perancangan, implementasi, pengujian, dan pemeliharaan. Data diperoleh melalui wawancara dengan manajer subdivisi Material Stock dan observasi di gudang Purwakarta serta Yogyakarta. Hasil penelitian menunjukkan bahwa sistem mampu menyediakan pencarian material berdasarkan nomor, nama, atau lokasi, menampilkan stok secara real time, memperbarui data foto dan lokasi, serta mendukung identifikasi cepat melalui pemindaian QR code. Uji coba dengan metode Black Box menunjukkan bahwa fungsionalitas-fungsionalitas utama yang diuji dapat berjalan sesuai dengan skenario yang dirancang. Dengan demikian, sistem ini diharapkan dapat mempercepat pencarian, menyajikan data akurat, serta mengurangi ketergantungan pada metode manual, sehingga mendukung efisiensi operasional dan transformasi digital gudang PT KAI (Persero).
Kemampuan Digitalisasi Bahan, Media dan Evaluasi Pembelajaran Guru SMK Suamrdi, Kamin; Abdullah, Ade Gafar; Rohendi, Dedi
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 4 No. 4 (2023): Jurnal Pengabdian kepada Masyarakat Nusantara (JPkMN)
Publisher : Lembaga Dongan Dosen

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

Abstract

Teacher competence, especially vocational schools, must continue to be updated and improved so that they can continue to keep pace with advances in knowledge and technology. The ability of teachers to make materials, media and evaluation of digital-based learning needs to be improved so that learning can run well. This ability must be mastered by teachers, especially vocational school teachers who have practical subjects. The purpose of this training is to improve the digital competence of SMK teachers in making materials, media and evaluation of learning. The training uses participatory and collaborative methods with the concept of in-house training. The results of the training obtained are that teachers have knowledge, understanding, and competence in making displays, materials, assignments, exercises, job sheets, practice guides, videos, e-modules, tests and evaluations in preparing the teaching and learning process. As many as 88.3% of Pangandaran State Vocational School teachers have basic digital competencies in preparing materials, media and learning evaluations. The information technology facilities owned by the school are very good in supporting the digital competence of teachers. Teaching materials, media and evaluation of digital learning can be used to support and strengthen students' understanding in accordance with the subject matter being taught
Co-Authors ACHEAMPONG, KENNEDY Addy Rachmat Ade Gafar Abdullah, Ade Gafar Ade Gaffar Abdullah, Ade Gaffar Aldes Lesbani Amelia, Icha Ana Arrumaisha, Nissa Asep Yudi Permana Assaidah, Assaidah Aulia Zikri Rahman Barlin Barlin Bijak Riyandi Ahadito Budhi Setiawan Budi Mulyanti Dedy Suryadi Dewi, Claudia Dhia Salsabila Yazmi Edy Herianto Majlan, Edy Herianto Eka Daryanto, Eka Eki Nugraha Enda Permana Erlangga, Erlangga Fatma 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 Heri Sutarno Hikmawan, Rizki Indriana Sari Soleha Irwin Bizzy Iskandar, Naufal Nadhif Rabbani Iwa Kuntadi Jefri Jefri Kamin Sumardi Kamin Sumardi Koehler, Thomas Larutama, Wiku M Aditya Permana M. Miftach Fakhri Mardiyanto Mardiyanto Menik Setyowati Mokhamad Syaom Barliana Muhammad Adli Rizqulloh Muhammad Dzulfikar A Muhammad Said MUHAMMAD SAID Muktiarni Mumu Komaro Mustika Nuramalia Handayani Nirwan Syarif Nirwan Syarif, Nirwan Nugraha, Agri Triya Oduro-Okyireh, George Oduro-Okyireh, Theodore Poedji Loekitowati Hariani Pramudita, Resa Purnawan Purnawan Rahmah, Dea Ramadhan, Muhammad Oka Rasim, Rasim Risfidian Mohadi Roer Eka Pawinanto, Roer Eka Salni Saripudin Saripudin Septiadi, Jaka Shandyka, Muhammad Fajar Siregar, Batu Mahadi Sri Haryati Steven Julianto Situmeang Suamrdi, Kamin 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 Toni Kurrokhmat Toni Kurrokhmat Tri Kurnia Dewi Wihardi, Yaya Wong, Wai Yulianti, Dwi Yulianti, Dwi Hawa Yulinar Adnan Zainal Fanani