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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 Abmas Jurnal Industri dan Teknologi Samawa (JITSA) Jurnal Insinyur Profesional Jurnal Riset Rumpun Ilmu Teknik (JURRITEK) Jurnal Pepadu Jurnal Guru Komputer Jurnal Ilmiah Sistem Informasi
Dedi Rohendi
Universitas Pendidikan Indonesia
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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).
The Influence of Hydrogen Flow Rate and Humidifier Temperature on Performance of a PEMFC with Ti-Co/C Catalyst Adhiyanti, Nurmalina; Rohendi, Dedi; Utama, Muhammad Prima; Syarif, Nirwan; Rachmat, Addy; Yulianti, Dwi Hawa; Normah, Normah
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 3 (2025): October 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

This study explores the effect of hydrogen flow rate and humidifier temperature on the performance of the Membrane Electrode Assembly (MEA) using Ti-Co/C catalyst at the cathode and Pt/C at the anode in a single-cell Proton Exchange Membrane Fuel Cell (PEMFC). MEAs were fabricated by the spraying method and characterized using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) to determine their electrochemical surface area (ECSA) and conductivity. The results showed that the optimized ECSA value reached 8.38 cm2/g, and the electrical conductivity was 3.76 × 10-8 S/cm. The best performance was achieved at a hydrogen flow rate of 100 mL/min and room temperature humidification. Under the hydrogen flow rate test, the maximum power density reached 0.364 mW/cm2, while in the humidifier temperature variation, a maximum power density of 0.375 mW/cm2  was obtained at a current density 2.4 mA/cm2. These findings suggest that Ti-Co/C is a promising low-cost catalyst alternative to Pt and that operational conditions play a critical role in MEA performance
Preparation of Palm Kernel Shell Binchotan for Radio Frequency Energy Harvesting Sya'baniah, Nyimas Febrika; Syarif, Nirwan; Rohendi, Dedi; Rachmat, Addy; Syahputra, Rio Aldo
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 3 (2025): October 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

Research on the development of radio frequency energy harvesting slabs from palm kernel shells binchotan has been done. The slabs were characterized by using XRD and FTIR intrumentations to determine their crystallography and functional groups. The electrical response of slabs was measured on impedance spectroscopy instrumentation. The conductivity, impedance, and dielectric constant were calculated from impedance spectroscopy data. Diffractograms showed crystalline carbon and confirmed with the existence of peaks, at 2θ, 24.5° and 44.56°. FTIR analysis showed that carbon palm shells have the absorption length is in the range of wave numbers 1100 – 1200 cm-1 for CO of carboxylic acid, aldehyde, ketone and ester, from 1475 to 1600 cm-1 for C=C aromatic ring and double peaks in 1900 – 2100 cm-1 for conjugated C-C. The slabs conductivity varies from 1 to 7 mScm-1. Impedance values for the slabs vary from 1.5 to 2.4 ohm. Dielectric constants for the slabs range from 0.42 to 140.
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

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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
Kemampuan Guru SMK Mengimplementasikan Artificial Intelligence dalam Perangkat Ajar Sumardi, Kamin; Rohendi, Dedi; Saripudin, Saripudin; Ramadhan, Muhammad Oka
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 5 No. 4 (2024): Jurnal Pengabdian kepada Masyarakat Nusantara (JPkMN) Edisi September - Desembe
Publisher : Lembaga Dongan Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55338/jpkmn.v5i4.4244

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.
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.
Metode Lean Six Sigma sebagai Strategi untuk Meningkatkan Kualitas Pelayanan dengan Meminimalkan Pemborosan dalam Pengadaan Bumbu Dapur pada Distributor X Indriana Sari Soleha; Dedi Rohendi; Hanissa Okitasari
JURNAL RISET RUMPUN ILMU TEKNIK Vol. 4 No. 3 (2025): Desember : Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v4i3.6315

Abstract

Increasing business competition requires companies to consistently improve quality and operational efficiency. This study aims to identify and reduce non-value added activities in the procurement process at Distributor X, a company engaged in the distribution of instant cooking spices. Common issues include expired goods (49.05%), damaged packaging (18.78%), and product mismatches (32.17%). The Lean Six Sigma approach with the DMAIC (Define, Measure, Analyze, Improve, Control) method is used to address these problems. Measurement results show an average DPMO value of 10,076.58 and a sigma level of 3.82, which are still far below the Six Sigma quality standard. Improvement proposals include the implementation of barcode/RFID systems, FIFO inventory management, higher-quality packaging materials, and the use of unique product codes. In the Control phase, monitoring is carried out through an ERP system and the establishment of structured SOPs to support distribution oversight. This approach demonstrates potential in reducing defect rates and improving the overall quality of the procurement process.
PELATIHAN PEMBUATAN LULUR TRADISIONAL DARI DAUN BIDARA (Ziziphus spina christi L.) DI DESA TANJUNG BARU, OGAN ILIR, SUMATRA SELATAN Hariani, Poedji Loekitowati; Fatma; Ahadito, Bijak Rihandi; Said, Muhammad; Rohendi, Dedi
Jurnal Abdi Insani Vol 11 No 1 (2024): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v11i1.1379

Abstract

Perawatan kulit dan wajah telah dikenal sejak dahulu kala dan telah menjadi bagian dari kebudayaan masyarakat Indonesia. Masyarakat semakin menyadari bahaya kosmetika dari bahan kimia. Interaksi bahan kimia dengan kulit seringkali menimbulkan masalah seperti iritasi, komedo, kulit semakin kering, bahkan kulit menghitam dan mengelupas. Seiring dengan konsep back to nature, yaitu kembali menggunakan bahan alami untuk merawat kecantikan kulit maka perlu dikembangkan potensi lokal sebagai bahan baku perawatan kulit. Kegiatan pengabdian masyarakat yang dilakukan di desa Tanjung Baru kecamatan Indralaya Utara, Ogan Ilir bertujuan untuk memberikan pelatihan pembuatan lulur tradisional untuk perawatan wajah dan kulit dari daun bidara. Peserta kegiatan adalah ibu-ibu dan remaja putri, karena mereka yang sering melakukan perawatan tersebut. Kegiatan berupa penyuluhan tentang pentingnya perawatan kulit dan wajah, pelatihan cara pembuatan lulur dari daun bidara, cara penggunaan lulur dan penyimpanan. Selanjutnya dilakukan evaluasi melalui Pre-test, Pos-Tes dan kuesioner. Hasil kegiatan menunjukkan adanya peningkatan pemahaman peserta kegiatan tentang perawatan kulit dan wajah, meningkatnya pengetahuan tentang bahaya kosmetik dari bahan kimia dan meningkatnya pengetahuan penggunaan bahan nabati sebagai bahan baku lulur dari semula 35,33 % menjadi 95,33 %. Berdasarkan hasil kuesioner menunjukkan bahwa peserta kegiatan menyukai produk lulur yang dihasilkan. Hasil uji tingkat kesukaan menunjukkan sebanyak 86,68 % peserta sangat suka terhadap 5 jenis tingkat kesukaan yang diujikan yaitu aroma, tekstur, warna, kekentalan dan kenyamanan lulur dari daun bidara. Tidak ada peserta yang menyatakan tidak suka, kurang suka dan netral. Hasil kegiatan menunjukkan lulur dari daun bidara diterima dengan baik, peserta juga antusias melanjutkan membuat lulur untuk perawatan kulit dan wajah.
Effect of Hydrogen Flow Rate on MEA Performance with a Three-Catalyst-Layer Pt/C Configuration Yulianti, Dwi Hawa; Rohendi, Dedi; Budiman, Rahmadi; Firanda, Dera Okta; Rachmat, Addy; Sya'baniah, Nyimas Febrika
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 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.i2.146

Abstract

An essential component in Proton Exchange Membrane Fuel Cells (PEMFCs) is the Membrane Electrode Assembly (MEA), which facilitates the electrochemical reaction between hydrogen and oxygen to generate electrical energy. This study examines the effect of varying hydrogen gas flow rates on the performance and durability of a Pt/C-based MEA. The MEA used in this research measures 6.5 cm × 30 cm with a catalyst loading of 2 mg/cm². The electrode is constructed in three layers of catalysts to maximize interfacial contact within the catalyst layer. The tested hydrogen flow rates were 100, 200, 300, and 400 mL/min. Performance evaluation was conducted through polarization (I–V) and power (I–P) curve measurements. The results indicated optimal performance at a 200 mL/min flow rate, with a maximum power density of 3.563 mW/cm² and a current density of 10.256 mA/cm². Durability testing was carried out under a constant current of 2 A for 12 hours and showed a voltage drop of 24.35% after 10 hours of operation. Electrochemical characterization using Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS), and Linear Sweep Voltammetry (LSV) yielded an Electrochemical Surface Area (ECSA) of 1.477 × 10⁻⁵ m²/g, electrical conductivity of 3.218 × 10⁻⁴ S/cm, and an electric charge of 4.2 × 10⁻⁶ C.
Co-Authors ACHEAMPONG, KENNEDY Addy Rachmat Ade Gafar Abdullah, Ade Gafar Ade Gaffar Abdullah, Ade Gaffar Adelia, Ory Adhiyanti, Nurmalina Agus Setiawan Aldes Lesbani Amelia, Icha Ana Arrumaisha, Nissa Asep Yudi Permana Assaidah, Assaidah Barlin Barlin Bijak Riyandi Ahadito Budhi Setiawan Budi Mulyanti Budiman, Rahmadi Dedy Suryadi Dewi, Claudia Edy Herianto Majlan, Edy Herianto Eka Daryanto, Eka Fakhili Gulo Fatma Fatma Fatmawati Fatmawati Fauzan, Mochamad Patra Bani Fauzan, Mochamad Rizal Felicity, Felicity Firanda, Dera Okta Gigin Gantini Putri Hanapi, Zaliza Hanissa Okitasari Hanissa Okitasari Hary Widjajanti Heri Sutarno Hikmawan, Rizki Indriana Sari Soleha Iskandar, Naufal Nadhif Rabbani Iwa Kuntadi Jefri Jefri Kamin Sumardi Kamin Sumardi Koehler, Thomas Larutama, Wiku Menik Setyowati Mokhamad Syaom Barliana Muhammad Adli Rizqulloh Muhammad Dzulfikar A Muhammad Faizal 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 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 Syahputra, Rio Aldo Syarif, Nirwan Syarif, Nirwan Syarif, Nirwan Syarif, Nirwan Sya’baniah, Nyimas Febrika Tarmizi Taher Tri Kurnia Dewi Utama, Muhammad Prima Wong, Wai Yulianti, Dwi Yulianti, Dwi Hawa Yulinar Adnan Zainal Fanani